WO1996041306A1 - Method of determining an object's position and associated apparatus - Google Patents
Method of determining an object's position and associated apparatus Download PDFInfo
- Publication number
- WO1996041306A1 WO1996041306A1 PCT/US1996/010379 US9610379W WO9641306A1 WO 1996041306 A1 WO1996041306 A1 WO 1996041306A1 US 9610379 W US9610379 W US 9610379W WO 9641306 A1 WO9641306 A1 WO 9641306A1
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- WIPO (PCT)
- Prior art keywords
- beacon
- light
- plane
- reflector
- reflecting
- Prior art date
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
- G06F3/0423—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen using sweeping light beams, e.g. using rotating or vibrating mirror
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
- G06F3/021—Arrangements integrating additional peripherals in a keyboard, e.g. card or barcode reader, optical scanner
- G06F3/0213—Arrangements providing an integrated pointing device in a keyboard, e.g. trackball, mini-joystick
Definitions
- the present invention relates generally to methods of determining an object's position and, in a preferred embodiment thereof, more particularly provides a method and apparatus for optically digitizing an object's position on a plane above a computer keyboard.
- Pointing devices are well known in the computer art. Their purpose, generally, is to permit the computer user to input positional information to the computer. A pointing device performs this function by "digitizing" an object's relative position in space, that is, by putting the positional information in a form that is readable by the computer.
- pointing devices have increased as modern computer user interfaces have become increasingly graphical. For example, a computer user may now use a "mouse" to select a file to open for editing purposes (by "clicking" on an icon representing the file) , instead of typing a file name on a keyboard.
- Typical pointing devices currently available to computer users include mouse, trackball, digitizing pad, joystick, touch screen, and eye tracking devices. There are variations of each of these and there are pointing devices that have a combination of features found on more than one of these. Each, however, has its disadvantages.
- a mouse typically has a housing for grasping in the user's hand, and a ball underneath the housing for rolling the housing about on a desktop. Rollers inside the housing digitize the mouse's position by translating the ball's movement into electrical signals which are then communicated to the computer. Switches, typically mounted to the housing's top surface, allow the user to "click" (activate a switch to select an icon, for example) on an object displayed on the computer's screen, or perform other functions. The mouse, however, requires the user to devote a significant portion of a desktop as an area in which the mouse can be rolled around.
- the mouse also requires the user to remove one hand from the keyboard while the mouse is being rolled around on the desktop and/or while a mouse switch is being activated, thus slowing down the data entry process. Furthermore, the mouse requires a means of communicating the electrical signals to the computer, such as a cable which must be attached between the computer and the mouse and must follow the mouse around the desktop.
- a trackball eliminates some of the mouse's disadvantages, but substitutes others in their place.
- the trackball is, essentially, an upside-down mouse, having a stationary housing with the ball facing upward so that the ball can be rolled by the user's fingers.
- the switches are normally placed on the top surface of the housing adjacent the ball.
- the rollers which translate the ball 's motion into electrical signals are located in the housing where, due to the large upward-facing opening in the housing through which the ball protrudes, they are exposed to dust and dirt.
- Some keyboard manufacturers have eliminated the need for a separate trackball device cable for communicating the electrical signals to the computer by building the trackball device directly into the keyboard housing so that a single cable communicates both keyboard and trackball input to the computer. The user does, however, still have to move his or her hand away from the keyboard in order to roll the ball.
- Another disadvantage is that a large amount of dexterity is required to manipulate the trackball while clicking on a screen object, if only one hand is used.
- a digitizing pad typically utilizes a rectangular planar area on the surface of a hard plastic housing, which, in turn, is placed on the user's desktop.
- the pad uses one of several methods to sense the position of a pen or stylus on the pad surface.
- the pressure of the pen or stylus on the pad surface makes contact or changes capacitance in many fine, closely spaced conductors beneath the pad's surface.
- the pen or stylus carries a magnetic or electromagnetic field source which is sensed by the pad, thus, the pen or stylus position is sensed due to the proximity of the pen or stylus to the pad.
- the digitizing pad's disadvantages is the space on the desktop taken up by the pad's housing.
- a joystick is another pointing device, and may have either a movable or a non-movable stick.
- the movable joystick operates similar to a trackball, except that a stick is inserted into the ball giving the user a means of grabbing the ball.
- the stick also limits movement of the ball.
- the non-movable joystick utilizes pressure sensors encircling the stick to sense the force and direction in which the user is pushing the stick.
- the non-movable joystick does not communicate a position to the computer, instead it senses a force vector which the computer may use to adjust the position of a screen object.
- manipulation of the switches and stick is very difficult with only one hand, thus, in order to use a joystick, the user must remove both hands from the keyboard.
- Eyetracking devices use expensive, sophisticated methods of determining where on the computer screen the user's eyes are focused. In this way the user's hands do not have to leave the keyboard in order for the positional information to be communicated to the computer.
- Touch screens permit the user to communicate a position to the computer by actually touching an area on the computer screen. Usually the screen area is associated with an object or menu choice displayed on the screen.
- the user's hand must leave the keyboard to use the device.
- a method which permits the user to communicate positional information to the computer by obstructing a light grid with the user's finger, without removing either of the user's hands from the keyboard.
- An apparatus is also provided which produces the light grid from a single light source and detects the position of an object obstructing the grid.
- a method of sensing an object's position comprising the steps of providing a light source, causing the light source to emit light rays, collimating a portion of the light rays so that the light rays form a light beam having substantially parallel sides, providing a beam splitter, passing the beam through the beam splitter, providing means for producing a beacon from the beam, directing the beam into the beacon producing means thereby producing a beacon, providing means for separating the beacon into at least two portions, passing the beacon through the beacon separating means so that the beacon is separated into first and second beacon portions, providing a first reflecting means for reflecting the first beacon portion back to the beam splitter, directing the first beacon portion to the first reflecting means, providing a second reflecting means for reflecting the second beacon portion back to the beam splitter, directing the second beacon portion to the second reflecting means, and providing light sensing means for sensing light reflecting back to the beam splitter, whereby, if the object obstructs the first or the second beacon portions, the light sensing means
- An optical digitizer comprising a light grid, the light grid comprising first and second beacons, first means for orienting the first beacon in the light grid, second means for orienting the second beacon in the light grid, first means for reflecting the first beacon across the light grid, the first reflecting means being disposed such that the light grid is intermediate the first orienting means and the first reflecting means, second means for reflecting the second beacon across the light grid, the second reflecting means being disposed such that the light grid is intermediate the second orienting means and the second reflecting means, first means for reducing the first beacon to a first linear beam of light after the first beacon has been reflected across the light grid, second means for reducing the second beacon to a second linear beam of light after the second beacon has been reflected across the light grid, and means for detecting an interruption in each of the first and second linear beams of light.
- a computer keyboard device of the type having a generally planar top surface and a plurality of keys disposed on the top surface, and further having the capability of detecting the position of an object
- the computer keyboard comprising reflector means, the reflector means being supported on the keyboard top surface, beacon producing means, the beacon producing means being mounted on the keyboard top surface and being positioned so that a beacon of light is directed to sweep repeatedly across the reflector means to produce a reflected light beacon, and light sensing means for measuring the intensity of light received therein, the light sensing means being positioned to receive the reflected light beacon therein.
- the method comprising the steps of generating a light beam having substantially parallel sides, converting the light beam to an oscillating beacon, the oscillating beacon having first and second differently directed portions, the first and second beacon portions being disposed in a first plane, intercepting and reflecting at least one of the first and second oscillating beacon portions in the first plane, transposing at least one of the first and second beacon portions to a second plane, the second plane being offset from the first plane, interposing the object in the path of at least one of the first and second beacon portions to interrupt it, sensing the interruption of at least one of the first and second beacon portions in the second plane, and utilizing the sensed interruption to determine the position of the interposed object in the second plane.
- optical digitizer including a light source, the light source producing a beam of light, a beacon generator, the beacon generator producing a beacon from the beam of light, the beacon including a first beacon portion, a first reflector, the first reflector reflecting the first beacon portion, and a first light pipe, the first light pipe transposing the first beacon portion such that the transposed first beacon portion does not intersect the reflected first beacon portion.
- a computer keyboard device of the type having a generally planar keypad with a plurality of keys disposed on a top surface thereof, a housing supporting the keypad, and further having the capability of detecting the position of an object comprising reflector means, the reflector means being mounted intermediate the keypad and the housing, beacon producing means, the beacon producing means being mounted intermediate the keypad and the housing, and being positioned so that a beacon of light is directed to sweep repeatedly across the reflector means to produce a reflected light beacon in a first plane, beacon transposing means for transposing the reflected light beacon to a second plane, and light sensing means for measuring the intensity of light received therein, the light sensing means being positioned to receive the transposed and reflected light beacon therein.
- the use of the disclosed method and associated apparatus enables positional information to be conveniently and economically communicated to the computer.
- Use of the computer keyboard device embodiment enables the user's time to be more effectively utilized since the user's hands do not have to leave the keyboard to communicate positional information to the computer.
- FIG. 1 is a schematic representation of an optical digitizer embodying principles of the present invention
- FIG. 2 is a flow chart illustrating a method of determining an object's position embodying principles of the present invention.
- FIG. 3 is a top plan view of a computer keyboard having the optical digitizer of FIG. 1 thereon;
- FIG. 4 is a cross-sectional view through the keyboard, taken along line 4-4 of FIG. 3;
- FIG. 5 is an isometric view of a light grid produced by the optical digitizer illustrating obstructed and unobstructed portions of the light grid;
- FIG. 6A is a plot of light reflected back to a light sensor of the optical digitizer when the light grid is totally unobstructed;
- FIG. 6B is a plot of the light reflected when the light grid is obstructed by an object in a first position
- FIG. 6C is a plot of the light reflected when the light grid is obstructed by an object in a second position
- FIG. 6D is a plot of the light reflected when the light grid is obstructed by an object in a third position
- FIG. 6E is a plot of the light reflected when the light grid is obstructed by an object in a fourth position
- FIG. 7 is a schematic representation of another optical digitizer embodying principles of the present invention.
- FIG. 8 is a cross-sectional view through the optical digitizer of FIG. 7, taken along line 8-8 of FIG. 7;
- FIG. 9 is a top plan view of a partially cut away computer keyboard having the optical digitizer of FIG. 7 thereon;
- FIG. 10 is a schematic representation of yet another optical digitizer embodying principles of the present invention.
- FIG. 11 is a top plan view of a partially cut away computer keyboard having the optical digitizer of FIG. 10 thereon.
- FIG. 1 Illustrated in FIG. 1 is an optical digitizer 10 which embodies principles of the present invention.
- a light source 12 provides a compact beam of light 14 which is in the infrared portion of the light spectrum in the illustrated preferred embodiment.
- the light source 12 includes a laser 16 which, in turn, includes a light emitting diode 20 and a collimator 22.
- the light emitting diode 20 produces infrared light when leads 18 are connected to a power source (not shown) .
- the infrared light produced by the light emitting diode 20 is made into the beam 14 having essentially parallel sides by the collimator 22.
- the beam 14 next passes into a beam splitter 24.
- the beam splitter 24 includes a half-silvered mirror 26 which passes half of the beam 14 and reflects the other half.
- the reflected half of the beam 14 is not used in the illustrated preferred embodiment, so it is not shown in FIG. 1.
- the beam 14 next passes into a beacon generator 28.
- the beacon generator 28 produces a beacon 30 from the beam 14 by reflecting the beam 14 off of an oscillating mirror 32.
- the beacon 30 differs from the beam 14 in that the beacon 30 "sweeps" across a plane, whereas the beam 14 remains stationary. In other words, the beacon 30 is the beam 14 put into motion by the oscillating mirror 32.
- the beacon 30 may be generated from the beam 14 by another method without deviating from the principles of the present invention.
- a rotating polygonal mirror could be used to repeatedly and sequentially sweep beam 14 across an area.
- beam 14 could be directed across a curved surface instead of a flat plane.
- the beacon 30 is directed into a beacon separator 34.
- the beacon separator 34 the beacon 30 is separated into several components.
- One component is (as viewed in FIG. 1) a horizontal component 36.
- the horizontal component 36 passes through the beacon separator 34 in the illustrated preferred embodiment without any change in direction.
- Another component, a vertical component 38 (as viewed in FIG. 1) , is reflected off of a mirror 40 so that
- a discriminating reflector 42 In the area intermediate the horizontal component 36 and the vertical component 38 of the beacon 30 in the beacon separator 34 is a discriminating reflector 42.
- the purpose of the discriminating reflector 42 is to allow the optical digitizer 10 to discriminate the horizontal component 36 from the vertical component 38.
- the discriminating reflector 42 directs a small portion of the beacon 30 back to the oscillating mirror 32. The manner in which the discriminating reflector 42 allows discrimination between the horizontal and vertical components 36,38 will become clear upon further description of the preferred embodiment below.
- the horizontal component 36 of the beacon 30 next strikes a reflector 44 which directs the beacon 30 in a downward direction as viewed in FIG. 1.
- the uppermost limit of the horizontal component 36 illustrated as a beam 46 in the beacon separator 34, once reflected off of the reflector 44, becomes the leftmost limit of a horizontal beacon portion 48 as viewed in FIG. 1.
- the lowermost limit of the horizontal component 36 illustrated as a beam 50, once reflected off of the reflector 44, becomes the rightmost limit of the horizontal beacon portion 48 as viewed in FIG. 1. Therefore, the horizontal beacon portion 48 is nothing more than the horizontal component 36 of the beacon 30 reflected off of the reflector 44.
- the reflector 44 in the illustrated preferred embodiment is constructed of a material which enhances the accuracy of the optical digitizer 10.
- the material a reflective angle film (RAF) available from the 3M Corporation, reflects light at the same angle independent of the angle at which the light strikes its surface, within limits.
- RAF reflective angle film
- FIG. 1 it can be seen that beam 46 strikes the reflector 44 (constructed of the RAF material) at a slightly different angle than does beam 50, however, once reflected off of reflector 44, beams 46 and 50 are parallel in the horizontal beacon portion 48. It is ⁇ to be understood that, in carrying out the principles of the present invention, the reflector 44 does not have to be made of the RAF material, and that beams 46 and 50 do not have to be parallel in the horizontal beacon portion 48.
- the reflector 44 could have a curved shape instead of the linear shape representatively illustrated in FIG. 1. In that way, a beam passing over the surface of the reflector 44 could be reflected in a direction which depends upon the curvature of the reflector 44.
- a beam 54, farthest to the right in the vertical component 38 as illustrated in FIG. 1 strikes the reflector 52 and is reflected to the right in a direction orthogonal to the horizontal beacon portion 48.
- a beam 56, farthest to the left in the vertical component 38, strikes the reflector 52 and is also directed to the right, orthogonal to horizontal ⁇ beacon portion 48 as illustrated in FIG. 1.
- vertical component 38 of the beacon 30 is reflected off of reflector 52 so that it sweeps vertically, as illustrated in FIG.
- beam 14 is continuously directed to the oscillating mirror 32 in the beacon generator 28, the resulting beacon 30 is also continuous. Therefore, although beams 46 and 50 are illustrated as being at the outer limits of horizontal beacon portion 48, and beams 54 and 56 are illustrated as being at the outer limits of vertical beacon portion 58, it is important to understand that the beam 14, in the form of the vertical or horizontal beacon portion 48,58 sweeps continuously between these outer limits. Note, however, that at any one instant in the illustrated preferred embodiment, beam 14 may be directed to the horizontal beacon portion 48 or vertical beacon portion 58, but not both.
- Beams 46,50,54,56 are referred to in this description of the illustrated preferred embodiment, no two of these are present at one time, since they all emanate from the same beam 14 produced by the light source 12.
- Beams 46,50,54,56 representatively illustrated in FIG. 1 are all simply different positions of beam 14.
- different beacon portions 48,58 and beacon components 36,38 are just parts of beacon 30, which is, in turn, made up of different positions of beam 14 produced by the oscillating mirror 32.
- Beam 56 intersects beam 46 at point 60 and intersects beam 50 at point 62.
- Beam 54 intersects beam 46 at point 64 and intersects beam 50 at point 66.
- the horizontal beacon portion 48 is orthogonal to the vertical beacon portion 58, points 60, 62, 64, and 66 define the corners of a rectangular light grid 68.
- the horizontal beacon portion 48 sweeps from side to side, and the vertical beacon portion 58 sweeps from top to bottom, as representatively illustrated in FIG. 1.
- the defined beginning of the sweep of the horizontal beacon portion 48 shall be at its leftmost limit (beam 46 as illustrated in FIG. 1)
- the defined beginning of the sweep of the vertical beacon portion 58 shall be at its upper limit (beam 56 as illustrated in FIG.
- the light grid 68 could have a shape other than rectangular without deviating from the principles of the present invention. If, as described above, beams 46 and 50 are not parallel to each other, a trapezoid shape is produced. If, additionally, beams 56 and 54 are not parallel to each other, another polygonal shape is produced. Light grid 68 may take virtually any shape in keeping with the principles of the present invention as long as no beam in the horizontal beacon portion 48 is collinear with a beam in the vertical beacon portion 58.
- Reflector 70 representatively illustrated in FIG. 1 as being horizontally disposed at the
- reflector 72 representatively illustrated in FIG. 1 as being vertically disposed at the right-hand edge of vertical beacon portion 58, reflects the vertical beacon portion 58 directly back in the direction of reflector 52.
- Unfilled arrowheads on beams representatively illustrated in vertical beacon portion 58 indicate the direction of beams which have reflected off of reflector 72.
- Reflectors 70 and 72 are made of a material which reflects light back in the same direction at which it initially strikes the material. It is known to those skilled in the art as retro-reflecting film. There are several types of retro-reflecting film, including micro corner cube and micro sphere. Applicants have found the micro corner cube type to give acceptable results in the illustrated preferred embodiment apparatus.
- the cumulative total of the beams reflected back from the horizontal and vertical beacon portions 48,58 and the discriminating reflector 42 to the beam splitter 24 is continuous and equal to the beam 14 which leaves the beam splitter 24 to enter the beacon generator 28 (see FIG. 6A and accompanying description) . It is to be understood, however, that as beam 14 is reflected off of various surfaces and passes through various components of the illustrated preferred embodiment,
- Discriminating reflector 42 in the beacon separator 34 takes advantage of the above-mentioned loss in light intensity by reflecting a small portion of the beacon 30 back to the beam splitter 24 before it reflects off of any of the other reflecting surfaces 40,44,52,70,72. This produces a momentary increase in light intensity reflected back to the beam splitter 24 to aid in discriminating between the horizontal and vertical components 36,38 of the beacon 30 reflected back to the beam splitter 24. Other methods of discrimination may be utilized without deviating from the principles of the present invention.
- a nonreflective surface could be provided in place of discriminating reflector 42, which would produce an absence of reflected light between the horizontal and vertical components 36,38 reflected back to the beam splitter 24.
- a series of coded nonreflecting lines could be positioned near the ends of the reflectors 70,72, the code telling the computer that a horizontal and/or vertical sweep has ended and/or begun.
- Yet another method of telling a horizontal from a vertical sweep would be to provide an encoder on the oscillating mirror 32 so that the mirror's position and, therefore, the direction of the beam 14 is communicated to the computer.
- a preferred embodiment of a method 150 of determining an object's position in accordance with the principles of the present invention is representatively illustrated.
- the preferred method embodiment is for determining the object's position on a two-dimensional plane, although other embodiments of the present invention may be used to determine the object's position in one or three dimensions, the object's velocity or acceleration, etc.
- a light beam is generated.
- the light beam is compact and is composed of light rays which are essentially parallel to each other. The more compact the light beam, the greater the resolution capability, and the more the light rays are parallel to each other, the greater the accuracy of the preferred embodiment method 150.
- a conventional light emitting diode-type infrared laser having an integral collimator produces a suitable light beam for use with the preferred embodiment method 150.
- Other suitable light beam producers are commercially available, for example, a laser of the type typically used in compact disk drives. It is not necessary that the light beam produced be in the infrared range of the light spectrum.
- the beam is passed through a beam splitter.
- the purpose of the beam splitter in the preferred embodiment method 150 is to separate the light which is later reflected back to the beam splitter from the light beam produced in step 152.
- the preferred embodiment method 150 utilizes a half-silvered mirror which passes fifty percent of the light beam, and reflects fifty percent of the light beam.
- Other beam splitter configurations suitable for use with the preferred embodiment method 150 are commercially available, such as a dual prism having a partially-reflective film between the prisms.
- the fifty percent of the light beam produced in step 152 which is reflected by the beam splitter is not utilized. It is to be understood, however, that this reflected fifty percent of the light beam could be utilized to, for example, produce a beacon as described hereinbelow for use in determining an object's position, without deviating from the principles of the present invention.
- a beacon is produced from the unreflected fifty percent of the light beam which is passed through the beam splitter.
- an oscillating mirror is used to reflect the beam back and forth repeatedly, thereby producing the beacon.
- the oscillating mirror is also used later in the preferred embodiment method 150 to reflect the beacon produced in this step back to the beam splitter.
- beacon producing means are suitable for use in the preferred embodiment method 150, for example, a rotating polygonal mirror.
- a rotating mirror has advantages over the oscillating mirror. For example, a rotating mirror produces a beacon which sweeps over an area repeatedly in only one direction, instead of back and forth, making it somewhat less complex to later differentiate between the forward and backward sweeps. Another advantage of a rotating mirror is that it typically produces a linear sweep rate, that
- the beam is made to sweep over an area with a relatively constant angular velocity, making it somewhat less complex to later compute the relationship between the beam's position and time.
- the oscillating mirror typically produces a sinusoidal sweep rate. Applicants, however, have chosen to use the oscillating mirror in the preferred embodiment method 150 because it has less bulk and fewer moving parts than a typical rotating mirror.
- the beacon produced in step 156 is separated into two beacon portions.
- Each of the beacon portions so separated is used later to determine the object's position in one dimension. Therefore, two beacon portions are needed in the preferred embodiment method 150, since the object's position is to be determined in two dimensions.
- a beacon separator in step 158 which has a reflective surface partially extending into the area swept by the beacon produced in step 156.
- the reflective surface diverts a portion of the beacon so that it may, separately from the undiverted portion of the beacon, be swept across the two- dimensional plane in which the object's position is to be determined.
- Other means of separating the beacon into multiple portions for example a prism, may be utilized without deviating from the principles of the present invention.
- the two beacon portions separated in step 158 are swept over an area in which the position of the object is to be determined.
- the area is the two-dimensional plane discussed above.
- the two beacon portions are swept over the area such that the beacon portions are orthogonal to each other. In this manner, later computations of the object's position are somewhat less complex. It is to be understood, however, that it is not necessary, in keeping with the principles of the present invention, for the beacon portions to be orthogonal to each other when being swept over the area in which the position of the object is to be determined.
- each beacon portion off of a reflective surface having the property that the reflected beacon portion leaves the reflective surface at a relatively constant angle regardless the angle at which the beacon portion strikes the reflective surface.
- the angle of one beacon portion leaving one reflective surface may be positioned so that it is orthogonal to the other beacon portion leaving the other reflective surface.
- each beacon portion could be reflected off of a curved reflector having a curvature such that the beacon portion would be reflected in the same direction no matter where the beacon portion strikes the curved reflector.
- step 162 after being swept over the area in which the position of the object is to be determined, the beacon portions are reflected back to the beam splitter.
- the object being positioned in the two-dimensional plane swept by the beacon
- each beacon portion back to the beam splitter For reflecting each beacon portion back to the beam splitter, applicants utilize a reflective surface having the property that it reflects light back in the same direction at which the light strikes the reflective surface. Other means, such as a mirror, may be utilized for reflecting each beacon portion back to the beam splitter without deviating from the principles of the present invention.
- the beacon portions are reflected back off of each reflective surface in a direction opposite to that which they had reflected off those reflective surfaces in the previous steps, namely, the reflective surfaces utilized by applicants to orient the beacon portions orthogonally described in step 160 above, the reflective surface utilized by applicants in the beacon separator described in step 158 above (only the beacon portion diverted in step 158) , and the oscillating mirror
- the beacon portions reflected back to the beam splitter in step 162 are directed to a light sensor.
- the light sensor measures the intensity of the beacon portions reflected back to the beam splitter.
- Applicants utilize a photodiode suitable for measuring the intensity of infrared light to measure the intensity of the beacon portions reflected back to the beam splitter.
- Other light sensors may be used without deviating from the principles of the present invention. It is to be understood, however, that the light sensor must be capable of measuring the intensity of the light produced in step 152 and must be capable of detecting the unreflected fragments of the beacon portions, described above in regard to step 162.
- step 166 the object's position in the two-dimensional plane is determined.
- the unreflected fragments of the beacon portions, detected in step 150 is determined.
- One unreflected fragment will be present in each beacon portion reflected back to the beam splitter in the preferred embodiment method 150.
- the position of the object in each of two dimensions can be determined.
- Applicants utilize a microprocessor to time the unreflected fragment in each beacon portion and compute the object's position, based on the sinusoidal sweep rate of the oscillating mirror. Since, in the preferred embodiment method 150, the beacon portions are orthogonal to each other, the object's position can be directly computed in cartesian coordinates in the two-dimensional plane. If, however, the beacon portions are not orthogonal to each other, the object's cartesian coordinates can still be computed, albeit using more complex calculations, without deviating from the principles of the present invention.
- the optical digitizer 10 is representatively illustrated as being disposed on a computer keyboard 80 having keys 90.
- the keyboard 80 is otherwise conventional, suited for input of text by typing on keys 90, and is typically used in conjunction with a computer.
- the top surface of the keyboard 80 having the keys 90 thereon is in a vertical orientation, with the side which typically faces the user being at the bottom of the illustration.
- the use of the terms “vertical” and “horizontal” refer to the representatively illustrated orientation of the keyboard 80 in FIG. 3. Stated in another manner, the "vertical” direction runs up and down, and the “horizontal” direction runs side to side in FIG. 3.
- Light source 12 beam splitter 24, beacon generator 28, beacon separator 34, and light sensor 74 (combinatively forming the previously described optical digitizer 10) are shown in schematicized form, conveniently mounted near the upper left-hand portion of the keyboard 80, although other positionings of these elements are possible without deviating from the principles of the present invention.
- Reflector 44 is mounted on a support 82 to the rear of the keys 90.
- Reflector 72 is mounted on a support 84 to the right of the keys 90.
- Reflector 52 is mounted on a support 86 to the left of the keys 90.
- Reflector 70 is mounted on an upwardly extending and rearwardly facing portion of a space bar 88.
- Points 60,62,64,66 form the corners of the rectangular light grid 68.
- the light grid 68 is positioned over a portion of the keys 90.
- the light grid 68 may be enlarged or reduced to any convenient size or shape and may overlay all, a portion of, or none of the keys 90.
- FIG. 4 Illustrated in FIG. 4 is a cross-sectional view taken along line 4-4 through the keyboard 80 illustrated in FIG. 3. In this view, the spacing between the keys 90 and the beam 50 can be seen. Reflectors 44 and 70 are positioned just above the n keys 90, reflector 44 being mounted to support 82, and reflector 70 being mounted to the space bar 88.
- Positioning the optical digitizer 10 in this manner allows a computer user to operate the digitizer 10 without removing the user's hands from the keyboard 80.
- the user can conveniently lift the fingers slightly above the keyboard 80, activate the optical digitizer 10 by, for example, pressing an appropriate control or function key on the keyboard, and then use one finger to obstruct the light grid 68 and thereby communicate positional information, select a screen object, etc.
- the user is finished using the digitizer 10, it is deactivated by, for example, pressing another control or function key, and the user may type on the keys 90 again. This is all accomplished without the user's hands leaving their normal positions above the keyboard 80.
- FIG. 5 shows how the location of an obstruction 92 in the light grid 68 is determined.
- filled arrowheads indicate the direction of light beams which have not been reflected off of reflector 70 or 72
- blank arrowheads indicate the direction of beams which have been reflected off of reflector 70 or 72.
- beams 56,50,54, and 46, and points 60,62,64, and 66 correspond to the same beams and points in FIGS. 1,3, and 4.
- Beams 46 and 50, at the outer limits of the horizontal beacon portion 48 are seen to be reflected off of reflector 70. They will be detected, as described above, by the light sensor 74.
- each of beams ' 46,50, 94,96, and 98 are part of the horizontal beacon portion 48.
- the center of the horizontal position of the obstruction 92 can be determined by averaging the horizontal positions of beams 94 and 96 which pass just to each side of the obstruction 92.
- the vertical portion of the grid 68 operates in the same manner as the horizontal portion.
- Beams 54 and 56, at the outer limits of the vertical beacon portion 58 are seen to be reflected off of reflector 72. They will be detected, as described above, by the light sensor 74.
- beams 100 and 102, passing just to each side of the obstruction 92 are also reflected back to the light sensor 74.
- beam 104, which strikes the obstruction 92 is not reflected back and, therefore, cannot be detected by the light sensor 74.
- each of beams 54,56,100,102, and 104 are part of the vertical beacon portion 58.
- the center of the vertical position of the obstruction 92 can be determined by averaging the vertical positions of beams 100 and 102 which pass just to each side of the obstruction 92.
- FIGS. 6A through 6E representatively illustrate how the light sensor 74 receives and measures the intensity of the reflected beam 14.
- the vertical scale in each of FIGS. 6A through 6E is reflected light intensity which the photodiode 76, through leads 78, communicates to the computer.
- the 0 horizontal scale is time. Traces on these graphs thus indicate a "snapshot" in time of the reflected light intensity "seen” by the light sensor 74.
- FIG. 6A representatively illustrates what the light sensor 74 sees when there is no obstruction in the light grid 68.
- Trace 106 is completely flat (with the exception of small increases in intensity 108 between horizontal and vertical sweeps of the beacon 30) , indicating that all of the beam 14 from the horizontal and vertical beacon portions 48,58 is being reflected back off of reflectors 70 and 72.
- the small increases in intensity 108 between the horizontal and vertical sweeps are due to the portion of the beacon 30 reflected back to the light sensor 74 by the discriminating reflector 42 in the beacon separator 34. In this manner, the computer can discriminate between a vertical and a horizontal sweep. If, as described above, a nonrefleetive surface is used to discriminate between horizontal and vertical sweeps of the beacon 30, a decrease, instead of an increase 108, in light intensity would be seen by the light sensor 74.
- FIG. 6A a vertical sweep of the beacon 30 is followed by another vertical sweep and a horizontal sweep is followed by another horizontal sweep. This is due to the fact that the mirror 32 is oscillating. Each sweep is immediately repeated in reverse as the mirror 32 oscillates back and forth. If a rotating polygonal mirror is used instead of an oscillating mirror, a vertical sweep will be followed by a horizontal sweep and a horizontal sweep will be followed by a vertical sweep.
- FIG. 6B representatively illustrates a trace 110 produced when there is an obstruction 92 in the light grid 68 near the beginning of both horizontal and vertical sweeps. Referring to FIG. 5, the obstruction 92 would be located near point 60, but still within the light grid 68.
- the light intensity represented by trace 110 is the same as trace 106 in the previous FIG. 6A.
- the horizontal beacon portion 48 is reflected back to the light sensor 74, between beams 46 and 94, the reflected light intensity remains the same (portion
- the light intensity represented by trace 110 is the same as trace 106.
- the reflected light intensity remains the same (portion 118 of trace 110) .
- the reflected light intensity drops (portion 120 of trace 110) .
- the reflected light intensity drops (portion 120 of trace 110) .
- Hi returns to its initial level (portion 122 of trace 110) .
- the remainder of trace 110 is the reverse of that described immediately above as the mirror 32 oscillates back to its initial position to begin another sweep of the beacon 30.
- a drop in reflected light intensity is seen by the light sensor 74 when an obstruction 92 is encountered in the horizontal and vertical sweeps.
- the center of the obstruction's position may be calculated by measuring the time from the beginning of the horizontal and vertical sweeps to the centers of the drops in reflected light intensity (portions 116 and 120 of trace 110) . The times thus measured correspond to the horizontal and vertical positions of the obstruction 92 in the light grid 68.
- time and horizontal and vertical position within the light grid 68 will vary, depending on many factors. If, for example, the position of the oscillating mirror 32 varies according to a sinusoidal function, the relationship between time and horizontal and vertical position within the light grid 68 will also be a nonlinear
- FIG. 6C is similar to FIG. 6B, except that the representatively illustrated portions of a trace 124 indicating a reduced reflected light intensity 126,128 are near the end of the horizontal and vertical sweeps, respectively.
- the trace 124 corresponds to a position of the obstruction 92 near point 66, but still within the light grid 68. Note that, with the obstruction 92 in that position, the unreflected beam 98 in the horizontal beacon portion 48 would be near the end of the horizontal sweep, corresponding to portion 126 of trace 124, and that the unreflected beam 104 in the vertical beacon portion 58 would be near the end of the vertical sweep, corresponding to portion 128 of trace 124.
- FIG. 6D Representatively illustrated in FIG. 6D are portions of a trace 130 having reduced reflected light intensity 132,134 near the beginning of the horizontal sweep and near the end of the vertical sweep of the beacon 30. This corresponds to a position of the obstruction 92 near point 64, but still within the light grid 68 (see FIG. 5) .
- FIG. 6E Representatively illustrated in FIG. 6E are portions of a trace 136 having reduced reflected light intensity 138,140 near the end of the horizontal sweep and near the beginning of the vertical sweep of the beacon 30. This corresponds to a position of the obstruction 92 near point 62, but still within the light grid 68 (see FIG. 5) .
- the optical digitizer 10 functions as described hereinabove, but the obstruction 92 is then permitted to obstruct one of the beacon portions 48,58 without obstructing the other. It is then possible to perform other functions, for example, measure the velocity of the obstruction 92 by dividing the distance separating the planes swept by the horizontal and vertical beacon portions 48,58 by the difference in time between when the light sensor 74 sees a reduced reflected light intensity in each sweep.
- FIG. 7 Illustrated in FIG. 7 is another preferred embodiment of an optical digitizer 200 which embodies principles of the present invention. It is shown in highly schematicized form for the purpose of clarity. Dashed lines and arrows are used to represent paths and directions, respectively, of light. Filled arrowheads represent directions of unreflected light and unfilled arrowheads represent directions of reflected light in a manner similar to that used in FIGS. 1, 3, 4, and 5. In the optical digitizer 200 illustrated in FIG. 7, however, light is reflected in more than one plane.
- a light source 202 provides a compact beam of light 204 which is in the infrared portion of the light spectrum in the illustrated preferred embodiment.
- the light source 202 includes a laser 206 which, in turn, includes a light emitting diode 208 and a collimator 210.
- the light emitting diode 208 produces infrared light.
- the infrared light produced by the light emitting diode 208 is made into the beam 204 having essentially parallel sides by the collimator 210.
- the beam 204 next passes through a half-silvered mirror 212 which passes half of the beam 204 and reflects the other half.
- the reflected half of the beam 204 is not used in the illustrated preferred ⁇ £ embodiment, so it is not shown in FIG. 7.
- the half- silvered mirror 212 performs essentially the same function in the optical digitizer 200 representatively illustrated in FIG. 7 as the half- silvered mirror 26 in the beam splitter 24 illustrated in FIG. 1.
- the beam 204 next passes through a refracting surface 214 and into a substantially transparent and planar lightguide 215.
- the lightguide 215 has a refractive index different than that of air, such that the beam 204 changes direction as it passes through the refracting surface 214.
- Applicants' preferred material for the lightguide 215 is clear plastic, although other materials, for example, glass, may be used without departing from the principles of the present invention.
- the purpose of the refracting surface 214 in the illustrated optical digitizer 200 is to enhance packaging, i.e., to permit the light source 202, half-silvered mirror 212, etc., to be positioned for optimum compactness.
- the beam 204 next passes through the lightguide 215 to an oscillating mirror 216.
- the beam 204 reflects off of the oscillating mirror 216, producing f1 a beacon 218.
- the beacon 218 differs from the beam 204 in that the beacon 218 "sweeps" across a plane, whereas the beam 204 remains stationary. In other words, the beacon 218 is the beam 204 put into motion by the oscillating mirror 216.
- the beacon 218 may be generated from the beam 204 by another method without deviating from the principles of the present invention.
- a rotating polygonal mirror could be used to repeatedly and sequentially sweep beam 204 across an area.
- beam 204 could be directed across a curved surface instead of a flat plane.
- the beacon 218 is directed by the oscillating mirror 216 to sweep across two parabolic mirrors formed on edges of the lightguide 215, one of which 220 is oriented generally vertical as viewed in FIG. 7, and the other of which 222 is oriented generally horizontal as viewed in FIG. 7.
- a portion of the beacon 218, the "vertical" component 224 sweeps across the vertical parabolic mirror 220.
- a "horizontal" beacon component 226 sweeps across the beacon
- the horizontal component 226 and horizontal parabolic mirror 222 are utilized to determine an object's horizontal position within a light grid
- the vertical component 224 and vertical parabolic mirror 220 are utilized to determine the object's vertical position within the light grid.
- the horizontal parabolic mirror 222 in the illustrated optical digitizer 200 has a smooth upwardly facing surface 234 with reflective material 235, such as silver, applied thereto.
- the upwardly facing surface 234 has a parabolic shape so that the radially-directed horizontal component 226, once reflected off of the upwardly facing surface 234 will sweep horizontally as a beacon having parallel sides.
- the vertical parabolic mirror is similarly constructed so that the radially directed vertical component 224, once reflected off of leftwardly facing surface 236, will sweep vertically as a beacon having parallel sides.
- the horizontal component 226 reflects off of the horizontal parabolic mirror 222, it is directed in an upward direction as viewed in FIG. 7.
- the lowermost limit of the horizontal component 226, illustrated as a beam 228, once reflected off of the horizontal parabolic mirror 222 becomes the leftmost limit of a horizontal beacon portion 230 as viewed in FIG. 7.
- beam 228 strikes the horizontal parabolic mirror 222 at a slightly different angle than does beam 232, however, once n- reflected off of horizontal parabolic mirror 222, beams 228 and 232 are parallel in the horizontal beacon portion 230.
- the horizontal parabolic mirror 222 does not have to be an integral portion of lightguide 215 or be silver-coated, and that beams 228 and 232 do not have to be parallel in the horizontal beacon portion 230.
- the horizontal parabolic mirror 222 could have a shape other than parabolic.
- beam 204 is continuously directed to the oscillating mirror 216, the resulting beacon 218 is also continuous. Therefore, although beams 228 and 232 are illustrated as being at the outer limits of horizontal beacon portion 230, and beams 238 and 240 are illustrated as being at the outer limits of vertical beacon portion 242, it is important to understand that the beam 204, in the form of the vertical or horizontal beacon portion 230,242 sweeps continuously between these outer limits. Note, however, that at any one instant in the illustrated preferred embodiment, beam 204 may be directed to the horizontal beacon portion 230 or vertical beacon portion 242, but not both.
- Beams 228,232,238,240 are referred to in this description of the illustrated preferred embodiment, no two of these are present at one time, since they all emanate from the same beam 204 produced by the light source 202.
- Beams 228,232,238,240 representatively illustrated in FIG. 7 are all simply different positions of beam 204.
- different beacon portions 230,242 and beacon components 224,226 are just parts of beacon 218, which is, in turn, made up of different positions of beam 204 produced by the oscillating mirror 216.
- Beam 240 intersects beam 228 at point 244 and intersects beam 232 at point 246.
- Beam 238 intersects beam 228 at point 248 and intersects beam 232 at point 250. Since the horizontal beacon portion 230 is orthogonal to the vertical beacon portion 242, points 244, 246, 248, and 250 define the
- the horizontal beacon portion 230 sweeps from side to side, and the vertical beacon portion 242 sweeps from top to bottom, as representatively illustrated in FIG. 7.
- the defined beginning of the sweep of the horizontal beacon portion 230 shall be at its leftmost limit (beam 228 as illustrated in FIG. 7), and the defined beginning of the sweep of the vertical beacon portion 242 shall be at its lower limit (beam 238 as illustrated in FIG. 7) .
- the light grid 252 could have a shape other than rectangular without deviating from the principles of the present invention. If, as described above, beams 228 and 232 are not parallel to each other, a trapezoid shape is produced. If, additionally, beams 240 and 238 are not parallel to each other, another polygonal shape is produced. Light grid 252 may take virtually any shape in keeping with the principles of the present invention as long as no beam in the horizontal beacon
- fr portion 230 is collinear with a beam in the vertical beacon portion 242.
- the horizontal and vertical beacon portions 230 and 242, and the light grid 252 defined thereby are "transposed", that is, transferred to another plane, different from a plane in which the components of the optical digitizer 200 heretofore described lie.
- the light source 202, half- silvered mirror 212, lightguide 215, oscillating mirror 216, horizontal parabolic mirror 222, and vertical parabolic mirror 220 all lie in a plane as representatively illustrated in FIG. 7.
- the light beam 204 and some of its permutations (vertical portion 242, horizontal portion 230, and light grid 252), however, coexist on another, transposed, plane.
- This transposition is accomplished by means of two light pipes, a vertical light pipe 254 which transposes the vertical beacon portion 242, and which is generally vertically oriented as shown in FIG. 7, and a horizontal light pipe 256 which transposes the horizontal beacon portion 230, and which is generally horizontally oriented as shown in FIG. 7.
- a vertical light pipe 254 which transposes the vertical beacon portion 242 and which is generally vertically oriented as shown in FIG. 7
- a horizontal light pipe 256 which transposes the horizontal beacon portion 230, and which is generally horizontally oriented as shown in FIG. 7.
- light pipe 254 takes the leftwardly directed vertical beacon portion 242, transposes it, and directs it to the right as viewed in FIG. 7.
- Horizontal light pipe 256 takes the upwardly directed horizontal beacon portion 230, transposes it, and directs it downward as viewed in FIG. 7.
- Light pipes 254 and 256 are described more fully below in the detailed description accompanying FIG. 8.
- reflector 258 representatively illustrated in FIG. 7 as being horizontally disposed at the lowermost extent of horizontal beacon portion 230, reflects the horizontal beacon portion 230 directly back in the direction of horizontal light pipe 256 and thence downwardly back to horizontal parabolic mirror 222.
- Unfilled arrowheads on beams representatively illustrated in horizontal beacon portion 230 indicate the direction of beams which have reflected off of reflector 258.
- beams in the horizontal beacon portion 230 are reflected from the horizontal light pipe 256 back through the lightguide 215 to rt horizontal parabolic mirror 222, through the lightguide 215 again to the oscillating mirror 216, through the lightguide 215 yet again, and thence to the half-silvered mirror 212.
- reflector 260 representatively illustrated in FIG. 7 as being vertically disposed at the right-hand edge of vertical beacon portion 242, reflects the vertical beacon portion 242 directly back in the direction of vertical light pipe 254, through the lightguide 215, and thence back to vertical parabolic mirror 220.
- Unfilled arrowheads on beams representatively illustrated in vertical beacon portion 242 indicate the direction of beams which have reflected off of reflector 260.
- beams in the vertical beacon portion 242 are reflected back through the lightguide 215 to vertical parabolic mirror 220, through the lightguide 215 again to the oscillating mirror 216, through the lightguide 215 yet again, and thence to the half-silvered mirror 212.
- Reflectors 258 and 260 are made of a material which reflects light back in the same direction at which it initially strikes the material. It is known to those skilled in the art as retro-reflecting film. There are several types of retro-reflecting film, including micro corner cube and micro sphere. Applicants have found the micro corner cube type to give acceptable results in the illustrated preferred embodiment apparatus.
- the cumulative total of the beams reflected back from the horizontal and vertical beacon portions 230,242 is continuous and equal to the beam 204 which leaves the half-silvered mirror 212, with the exception of the portion which strikes the refractive surface 214 between the horizontal and vertical parabolic mirrors 220,222.
- the increased reflected light intensity portion 108 between successive vertical and horizontal sweeps corresponds to that portion of beacon 218 which is directed back through the refractive surface 214 between beacon portions 224 and 226. It is to be understood, however, that as beam 204 is reflected off of various surfaces and passes through various
- the reflected beam 204 is reflected back off of the oscillating mirror 216, back through the lightguide 215, and strikes the half-silvered mirror 212. A portion of the reflected beam 204 is directed to a photodiode 262 in the path of the reflected beam 204, which is capable of measuring the beam's intensity.
- FIG. 8 a cross-sectional view of the optical digitizer 200 representatively illustrated in FIG. 7 is shown. For the purpose of clarity, only one representative beam 240 is shown in this view. The path of this beam 240 will be described below so that a complete understanding may be had of the manner in which the light grid 252 (see FIG. 7) is vertically transposed.
- Beam 240 originates at the oscillating mirror 216 when beam 204 (see FIG. 7) strikes the oscillating mirror 216 while it is directed toward the vertical parabolic mirror 220. At this point, beam 240 is a portion of the vertical beacon component 224 (see FIG. 7) . Beam 240 leaves the oscillating mirror 216, travels through the lightguide 215, strikes the vertical parabolic mirror 220, and is reflected back through the lightguide 215. At this point, beam 240 is a portion of the vertical beacon portion 242 (see FIG. 7) .
- beam 240 enters the vertical light pipe 254.
- the beam 240 first strikes and is reflected off of a right angle reflector 264.
- the right angle reflector 264 directs the beam 240 vertically upward as viewed in FIG. 8.
- Right angle reflector 264 may be constructed of any suitable material, such as a conventional mirror, capable of reflecting the beam 240. Applicants' preferred material for the right angle reflector 264 is silver-coated clear plastic.
- Beam 240 travels upwardly after being reflected off of the right angle reflector 264 and strikes a reflector 266.
- Reflector 266 directs the beam 240 horizontally to the right as viewed in FIG. 8.
- Reflector 266 is constructed using a material commonly known to those skilled in the art as right- angle film.
- Right-angle film reflects light back at a ninety degree included angle and is available from the 3M Corporation.
- Beam 240 leaves reflector 266 and travels to the right as viewed in FIG. 8, and passes in front of the horizontal light pipe 256, which is constructed in a manner similar to the vertical light pipe 254 described above.
- the horizontal beacon portion 230 (see FIG. 7) is transposed and, as representatively illustrated, intersects the vertically transposed vertical beacon portion 242 (see FIG. 7) .
- beam 240 passes in front of the horizontal light pipe 256, it intersects beam 228 (see FIG. 7) at point 244, at a corner of the light grid 252 (see FIG. 7) .
- beam 240 intersects beam 232 (see FIG. 7) at point 246, at another corner of the light grid 252.
- the beam 240 continues traveling to the right until it strikes vertical reflector 260.
- Beam 240 reflects off of reflector 260 and is directed horizontally to the left as viewed in FIG. 8. From this point, unless interrupted by an object in its path, beam 240 retraces its path and is vertically transposed back down into the lightguide 215 by the vertical light pipe 254. Unfilled arrowheads indicate the direction of the beam 240 after it has been reflected off of reflector 260. After being reflected back into the lightguide 215, the beam 240 reflects off the vertical parabolic mirror 220 and is directed back through the lightguide 215 to the oscillating mirror 216, and tfi thence back through the light guide 215, the refracting surface 214 (see FIG. 7), and to the half- silvered mirror 212 as described above.
- FIG. 9 Shown in FIG. 9 is a partially cut away keyboard 280 embodying principles of the present invention.
- the keyboard 280 takes advantage of the vertical transposition of the light grid 252 by the optical digitizer 200 described above, to position the light grid 252 above keys 282 disposed on the keyboard 280.
- Keyboard 280 has a housing 284 which supports a keypad 286.
- the keys 282 are distributed about the keypad 286 and include a space bar 288.
- Beneath the keypad 286, components of the optical digitizer 200 (more completely described hereinabove and representatively illustrated in FIGS. 7 and 8), including the light source 202, half-silvered mirror 212, photodiode 262, lightguide 215, horizontal and vertical parabolic mirrors 222,220, and oscillating mirror 216, are contained within the keyboard housing 284.
- Horizontal and vertical light pipes 256 and 254 vertically transpose the light grid 252 so that it is disposed above the keys 282. In this manner, a user may utilize a finger or other object to interrupt the light grid 252 above the keys 282 in order to indicate a position on a computer screen as more fully described hereinabove. It is to be understood that the light grid 252 may be otherwise utilized without departing from the principles of the present invention.
- Horizontal reflector 258 is attached to the space bar 288, facing the horizontal light pipe 256, similar to the manner in which reflector 70 is attached to space bar 88 in optical digitizer 10 representatively illustrated in FIG. 3.
- Horizontal and vertical light pipes 256 and 254 extend through the keypad 286 so that the light grid 252 is vertically transposed above the keys 282. In this configuration, referring also to FIG. 8, the keypad
- FIG. 10 Illustrated in FIG. 10 is another preferred embodiment of an optical digitizer 300 which embodies principles of the present invention. It is shown in highly schematicized form for the purpose of clarity. Dashed lines and arrows are used to represent paths and directions, respectively, of light. Filled arrowheads represent directions of light in one plane and unfilled arrowheads represent directions of light that has been transposed to another plane in a manner that will become clear upon consideration of the detailed description hereinbelow.
- optical digitizer 300 illustrated in FIG. 10 similar to the optical digitizer 200 illustrated in FIG. 7, light is reflected in more than one plane.
- Elements of the optical digitizer 300 representatively illustrated in FIG. 10, which have substantially the same function and structure as elements representatively illustrated in FIG. 7, have been identified in FIG. 10 with the same item numbers, and are not further described hereinbelow, unless such further description is helpful to fully and completely describe the optical digitizer 300.
- a light source 202 provides a compact beam of light 204 which is in the infrared portion of the light spectrum in the illustrate d preferred embodiment.
- the beam 204 next passes through a refracting surface 214 and into substantially transparent lightguide 215.
- optical digitizer 300 as representatively illustrated does not include a beam splitter or half-silvered mirror.
- T he beam 204 next passes to an oscillating mirror 216.
- the beam 204 reflects off of the oscillating mirror 216, producing a beacon 218.
- the beacon 218 is directed by the oscillating mirror 216 to sweep across two parabolic mirrors, one of which 220 is oriented generally vertical as viewed in FIG. 10, and the other of which 222 is oriented generally horizontal as viewed in FIG. 10.
- a portion of the beacon 218, the "vertical” component 224 sweeps across the vertical parabolic mirror 220.
- a “horizontal” beacon component 226 sweeps across the horizontal parabolic mirror 222.
- parabolic mirror 220 6 ⁇ parabolic mirror 220 and is also directed to the left, orthogonal to horizontal beacon portion 230 as illustrated in FIG. 10.
- vertical component 224 of the beacon 218 is reflected off of vertical parabolic mirror 220 so that it sweeps vertically, as illustrated in FIG. 10, between the representatively shown beams 238 and 240, forming a vertical beacon portion 242 which is orthogonal to horizontal beacon portion 230.
- Beam 240 intersects beam 228 at point 244 and intersects beam 232 at point 246.
- Beam 238 intersects beam 228 at point 248 and intersects beam
- the horizontal beacon portion 230 is orthogonal to the vertical beacon portion 242, points 244, 246, 248, and 250 define the corners of a rectangular light grid 252. In this light grid 252, the horizontal beacon portion 230 sweeps from side to side, and the vertical beacon portion 242 sweeps from top to bottom, as representatively illustrated in FIG. 10.
- the horizontal and vertical beacon portions 230 and 242, and the light grid 252 defined thereby are transferred to another plane, different from a plane in which the components of the optical digitizer 300 heretofore described lie.
- the light source 202, lightguide 215, oscillating mirror 216, horizontal parabolic mirror 222, and vertical parabolic mirror 220 all lie in a plane as representatively illustrated in FIG. 10.
- This transposition is accomplished by means of two light pipes, a vertical light pipe 254 which vertically transposes the vertical beacon portion 242 and is generally vertically oriented as shown in FIG. 10, and a horizontal light pipe 256 which vertically transposes the horizontal beacon portion 230 and is generally horizontally oriented as shown in FIG. 10.
- Vertical light pipe 254 takes the leftwardly directed vertical beacon portion 242, transposes it, and directs it to the right as viewed in FIG. 10.
- Horizontal light pipe 256 takes the upwardly directed horizontal beacon portion 230, transposes it, and directs it downward as viewed in FIG. 10.
- FIG. 10 Directions of beams which have been transposed are indicated in FIG. 10 with unfilled arrowheads.
- a conventional linear detector 302 representatively illustrated in
- FIG. 10 as being horizontally disposed at the lowermost extent of horizontal beacon portion 230, senses light intensity along its length.
- the linear detector 302 is of the type that is capable of indicating the light intensity of a beam which strikes anywhere on its upwardly facing (as viewed in FIG. 10) surface 306.
- conventional linear detector 304 representatively illustrated in FIG. 10 as being vertically disposed at the right-hand edge of vertical beacon portion 242, senses the light intensity along its length of the beam 204 in the vertical beacon portion 242.
- the light grid 252 of the optical digitizer 300 representatively illustrated in FIG. 10 may be disposed overlying a keyboard, and the light source 202, lightguide 215, oscillating mirror 216, and horizontal and vertical parabolic mirrors 222 and 220 may be disposed beneath the keyboard as with the optical digitizer 200 representatively illustrated in FIG. 9.
- horizontal linear detector 302 can be substituted for the reflector 258 on the space bar
- vertical linear detector 304 can be substituted for the reflector 260 to the right of the keys as representatively illustrated in FIG. 9.
- FIG. 11 Shown in FIG. 11 is a keyboard 310 embodying principles of the present invention.
- the keyboard is shown in FIG. 11 embodying principles of the present invention.
- keyboard 310 takes advantage of the vertical transposition of the light grid 252 by the optical digitizer 300 described above, to position the light grid 252 above keys 282 disposed on the keyboard 310, in a manner similar to the keyboard 280 representatively illustrated m FIG. 9.
- the optical digitizer 300 is substituted for the optical digitizer 200.
- Elements of keyboard 310 that are substantially similar in function and structure are identified with the same item numbers in FIG. 11 as in FIG. 9.
- • rt Keyboard 310 has a housing 284 which supports a keypad 286.
- the keys 282 are distributed about the keypad 286 and include a space bar 288.
- Beneath the keypad 286, components of the optical digitizer 300 (more completely described hereinabove and representatively illustrated in FIG. 10) are contained within the keyboard housing 284.
- Horizontal and vertical light pipes 256 and 254 vertically transpose the light grid 252 so that it is disposed above the keys 282. In this manner, a user may utilize a finger or other object to interrupt the light grid 252 above the keys 282 in order to indicate a position on a computer screen as more fully described hereinabove. It is to be understood that the light grid 252 may be otherwise utilized without departing from the principles of the present invention.
- Horizontal linear detector 302 is attached to the space bar 288, facing the horizontal light pipe 256, similar to the manner in which horizontal
- n- reflector 258 is attached to space bar 288 in optical digitizer 200 representatively illustrated in FIG. 9.
- Horizontal and vertical light pipes 256 and 254 extend through the keypad 286 so that the light grid 252 is vertically transposed above the keys 282.
- the light grid 252 may be positioned relative to other structures, such as a flat planar surface or a curved surface, without deviating from the principles of the present invention. It is also to be understood that light grid 252 may be in more than one plane above the keypad 286, the vertical and horizontal beacon portions 230 and 242 (see FIG. 10) being vertically transposed by the light pipes 254 and 256 to different planes above the keypad 286, enabling the velocity of an object obstructing the transposed beacon portions 230 and 242 to be calculated as more fully described hereinabove.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP96923311A EP0834152A1 (en) | 1995-06-07 | 1996-06-05 | Method of determining an object's position and associated apparatus |
AU63858/96A AU6385896A (en) | 1995-06-07 | 1996-06-05 | Method of determining an object's position and associated ap paratus |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/486,310 | 1995-06-07 | ||
US08/486,310 US5734375A (en) | 1995-06-07 | 1995-06-07 | Keyboard-compatible optical determination of object's position |
US08/651,881 | 1996-06-04 | ||
US08/651,881 US5786810A (en) | 1995-06-07 | 1996-06-04 | Method of determining an object's position and associated apparatus |
Publications (2)
Publication Number | Publication Date |
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WO1996041306A1 true WO1996041306A1 (en) | 1996-12-19 |
WO1996041306A9 WO1996041306A9 (en) | 1997-03-20 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/US1996/010379 WO1996041306A1 (en) | 1995-06-07 | 1996-06-05 | Method of determining an object's position and associated apparatus |
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US (2) | US5786810A (en) |
EP (1) | EP0834152A1 (en) |
AU (1) | AU6385896A (en) |
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Also Published As
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US6008798A (en) | 1999-12-28 |
EP0834152A1 (en) | 1998-04-08 |
AU6385896A (en) | 1996-12-30 |
US5786810A (en) | 1998-07-28 |
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