US20110310289A1 - Automatic focusing camera with moving mirror between fixed lens and fixed image sensor - Google Patents
Automatic focusing camera with moving mirror between fixed lens and fixed image sensor Download PDFInfo
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- US20110310289A1 US20110310289A1 US13/222,580 US201113222580A US2011310289A1 US 20110310289 A1 US20110310289 A1 US 20110310289A1 US 201113222580 A US201113222580 A US 201113222580A US 2011310289 A1 US2011310289 A1 US 2011310289A1
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- Prior art keywords
- image sensor
- lens
- mirror
- automatic focusing
- lens system
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
Definitions
- the present invention is directed to an automatic focusing camera, and more particularly to an automatic focusing line scan camera for use in scanning applications.
- the present invention is an automatic focusing camera which includes an image sensor.
- a fixed lens system is provided having a lens with an object side and an image side.
- the fixed lens system is located in a fixed position relative to the image sensor.
- a mirror is moveably positioned between the image side of the lens system and the image sensor. The mirror is located at an angle such that an image observed through the fixed lens system is reflected toward the image sensor.
- An actuator is connected to the mirror and moves the mirror relative to the lens system to change a distance between the lens system and the image sensor to adjust an object focal length between an object and the camera.
- the present invention provides a method for automatic focusing of a camera having an image sensor and a lens system with an objective lens located at a fixed position relative to the image sensor.
- the method comprises: (a) providing a mirror moveably mounted between an image side of the lens system and the image sensor; and (b) adjusting the position of the mirror to vary a length of an optical path between the image sensor and the lens system to vary an object focal point on an object being observed.
- FIG. 1 is a plan view of the automatic focusing camera in accordance with the present invention.
- FIG. 2 is a plan view of a second embodiment of an automatic focusing camera in 1 accordance with the present invention.
- FIG. 3 is a plan view of the automatic focusing camera shown in FIG. 2 illustrating the shift in the object focal line as the object focal point moves farther from or nearer to the lens system.
- the automatic focusing camera 10 is a line scan camera and includes an image sensor 12 and a fixed lens system 14 having an objective lens 16 with an object side 16 a and an image side 16 b .
- the fixed lens system 14 is located in a fixed position relative to the image sensor 12 , for example by fixed mounting of the image sensor 12 and the lens system 14 on a common substrate, for example a circuit board.
- the fixed lens system 14 has an optical axis 22 .
- the fixed lens system 14 is illustrated as including a single objective lens in the first preferred embodiment of the invention 10 , it will be recognized by those skilled in the art from the present disclosure that the fixed lens system 14 may include multiple lenses, depending upon the particular application. However, in accordance with the present invention, it is contemplated that if multiple lens are provided, the lenses would be adjusted to a fixed, in-use position relative to the other lenses as well as the image sensor 12 , and that the automatic focusing of the camera 10 would be carried out without further adjustment to the lens system 14 .
- a mirror 20 is positioned between the image side 16 b of the lens system 14 and the image sensor 12 .
- the mirror 20 is located at an angle such that an image located along the optical axis 22 is observed through the fixed lens system 14 and is reflected toward the image sensor 12 . This is illustrated most clearly by the path of the optical axis 22 of the lens system 14 which is reflected by the mirror 20 toward the image sensor 12 generally along a path 32 normal to the face of the image sensor 12 .
- An actuator 24 is connected to the mirror 20 that moves the mirror 20 relative to the lens system 14 to change a distance between the lens system 14 and the image sensor 12 to adjust an object focal length between an object (not shown in FIG. 1 ) and the camera 10 .
- the mirror 20 is mounted on an arm 28 having a pivot point 30 located along an optical axis 32 of the image sensor 12 .
- the actuator 24 is connected to the mirror 20 via the arm 28 .
- the pivot point 30 is located on an opposite side of the image sensor 12 from the mirror 20 and is offset sufficiently such that pivoting movement of the arm 28 approximates linear movement over the range of motion for the mirror 20 .
- the actuator 24 is a voice coil.
- the actuator 24 may be constructed as a solenoid or a stepper motor with a lead screw or using any other suitable controllable displacement means.
- the pivot point 30 is formed by a pin connection.
- the pivot could be provided by a flexible member such as a leaf spring or a living hinge which would provide the additional advantage of biasing the arm 28 in a given direction to maintain greater stability of the mirror 20 , if desired.
- the arm 28 can be adjusted to a second position, shown in dashed lines as 28 ′, moving the mirror 20 to a second position shown as 20 ′ to adjust the length of the optical path between the lens system 14 and the image sensor 12 .
- This causes the object focal point to vary in a predictable manner as explained in more detail below.
- the focusing mechanism is used in conjunction with a line-scan camera system, such as a line-scan CCD camera as the image sensor 12 .
- a line-scan camera system such as a line-scan CCD camera as the image sensor 12 .
- the image plane at the image sensor 12 must also be parallel to both the object and nodal planes in order for a complete image to be in focus.
- the pivoting of the mirror 20 in the first preferred embodiment causes the sensor plane to be non-parallel to the lens nodal plane resulting in an out-of-focus condition for all except a single line in the sensor plane across the face of the image sensor 12 .
- the image sensor 12 is a single-line sensor located at this line of perfect focus, then the image sensor 12 will see the object without distortion. This is especially useful for scanning applications where a single scan line is generally being observed aid imaged by the camera 10 .
- FIG. 2 a second preferred embodiment of the automatic focusing camera 110 is shown.
- the second preferred embodiment of the automatic focusing camera 110 is similar to the first embodiment 10 and like elements have been designated with the same reference numerals. The differences between the automatic focusing camera 110 of the second preferred embodiment of the invention and the automatic focusing camera 10 of the first embodiment of the invention are explained in detail below.
- the automatic focusing camera 110 includes a mirror 120 which is mounted for generally linear movement parallel to the optical axis 22 of the lens system 14 .
- the mirror 120 is connected to a linear actuator 124 for movement of the mirror 120 from a first position to a second position 120 ′, as shown by dashed lines in FIG. 2 , to change the length of the optical path between the lens system 14 and the image sensor 12 .
- the actuator 124 causes the mirror 120 to move linearly along a path generally parallel to the optical axis 22 of the lens system 14 , the object, lens and sensor planes all remain parallel such that the image can be focused on the surface of the image sensor 12 .
- the field of view of the image sensor 12 moves orthogonally to the sensor line as shown in FIG. 3 .
- a line-scan camera is also used as the image sensor 12
- the position of the mirrors 20 , 120 of the automatic focusing cameras 10 , 110 are adjusted to vary a length of an optical path between the imaging sensor 12 and the lens system 14 to vary an object focal point on an object being observed.
- this is accomplished by moving the mirror about the pivot point 30 , shown in FIG. 1 , and receiving the image to be scanned on a single line-scan camera, such as a single line CCD camera.
- the mirror 120 is moved linearly along a path parallel to an optical axis 22 of the lens system 14 , as shown in FIG. 2 , to adjust the position of the mirror 120 in order to focus the object image on the image sensor 12 .
Abstract
An automatic focusing camera which includes an image sensor is provided having a fixed lens system with a lens having an object side and an image side. The fixed lens system is located in a fixed position relative to the image sensor. A mirror is moveably positioned between the image side of at least one lens and the image sensor. The mirror is located at an angle such that an image observed through the fixed lens system is reflected toward the image sensor. An actuator is connected to the mirror and moves the mirror relative to the lens system to change a distance between the lens system and the image sensor to adjust an object focal length between an object and the object side of the lens.
Description
- This application is a divisional of U.S. patent application Ser. No. 11/543,240, filed Oct. 4, 2006, which is a reissue of U.S. Pat. No. 6,801,260, issued Oct. 5, 2004, the entire disclosures of which are incorporated by reference herein.
- The present invention is directed to an automatic focusing camera, and more particularly to an automatic focusing line scan camera for use in scanning applications.
- In scanning applications, for examples for packages traveling along a conveyor, it is often required that scans be carried out at varying target distances. For example, if a larger package moves along a conveyor beneath a scanner, the distance between the lens of the scanning camera system and the object is shorter than for a smaller package traveling along the same conveyor path. Prior known systems generally provide focusing for the scanning camera by adjusting the position of the lens system or the image sensor to focus the image plane on the sensor. However, this can result in higher costs for systems employing movement of one or more lens in order to maintain the optical alignment of the lens relative to one another and the sensor. Additionally, movement of the image sensor can add additional complexity and cost due to the need to provide electrical connections to an from the imaging sensor and to maintain the desired orientation of the sensor over the path of movement.
- In scanning applications, for examples for packages traveling along a conveyor, it is often required that scans be carried out at varying target distances. For example, if a larger package moves along a conveyor beneath a scanner, the distance between the lens of the scanning camera system and the object is shorter than for a smaller package traveling along the same conveyor path. Prior known systems generally provide focusing for the scanning camera by adjusting the position of the lens system or the image sensor to focus the image plane on the sensor. However, this can result in higher costs for systems employing movement of one or more lens in order to maintain the optical alignment of the lens relative to one another and the sensor. Additionally, movement of the image sensor can add additional complexity and cost due to the need to provide electrical connections to an from the imaging sensor and to maintain the desired orientation of the sensor over the path of movement.
- It would be desirable to be able to provide adjustment of the object focal length without the need for moving either the lens system (or one or more lenses therein) or the sensor relative to one another in order to provide a simple and reliable automatic focusing system for a camera system, preferably for use in scanning applications.
- Briefly stated, the present invention is an automatic focusing camera which includes an image sensor. A fixed lens system is provided having a lens with an object side and an image side. The fixed lens system is located in a fixed position relative to the image sensor. A mirror is moveably positioned between the image side of the lens system and the image sensor. The mirror is located at an angle such that an image observed through the fixed lens system is reflected toward the image sensor. An actuator is connected to the mirror and moves the mirror relative to the lens system to change a distance between the lens system and the image sensor to adjust an object focal length between an object and the camera.
- In another aspect, the present invention provides a method for automatic focusing of a camera having an image sensor and a lens system with an objective lens located at a fixed position relative to the image sensor. The method comprises: (a) providing a mirror moveably mounted between an image side of the lens system and the image sensor; and (b) adjusting the position of the mirror to vary a length of an optical path between the image sensor and the lens system to vary an object focal point on an object being observed.
- The foregoing summary, as well as the following detailed description of the preferred embodiments of the invention will be better understood when read in conjunction with the appended drawings. For the purposes of illustrating the invention, there is shown in the drawings embodiments which are presently preferred. It should be understood, however, that the invention/is not limited to precise arrangements shown. In the drawings:
-
FIG. 1 is a plan view of the automatic focusing camera in accordance with the present invention; -
FIG. 2 is a plan view of a second embodiment of an automatic focusing camera in 1 accordance with the present invention; -
FIG. 3 is a plan view of the automatic focusing camera shown inFIG. 2 illustrating the shift in the object focal line as the object focal point moves farther from or nearer to the lens system. - Certain terminology is used in the following description for convenience only and is not considered limiting. The words “right”, “left”, “lower”, and “upper” designate directions in the drawings to which reference is made. The terminology includes the words specifically noted above, derivatives thereof and words of similar import. Additionally, the terms “a” and “one” are defined as including one or more of a referenced item unless specifically noted.
- Referring to the drawings, wherein like numerals designate like elements throughout, there is shown in
FIG. 1 a preferred embodiment of an automatic focusingcamera 10 in accordance with the present invention. Preferably, the automatic focusingcamera 10 is a line scan camera and includes animage sensor 12 and afixed lens system 14 having anobjective lens 16 with anobject side 16 a and animage side 16 b. Thefixed lens system 14 is located in a fixed position relative to theimage sensor 12, for example by fixed mounting of theimage sensor 12 and thelens system 14 on a common substrate, for example a circuit board. Thefixed lens system 14 has anoptical axis 22. While thefixed lens system 14 is illustrated as including a single objective lens in the first preferred embodiment of theinvention 10, it will be recognized by those skilled in the art from the present disclosure that thefixed lens system 14 may include multiple lenses, depending upon the particular application. However, in accordance with the present invention, it is contemplated that if multiple lens are provided, the lenses would be adjusted to a fixed, in-use position relative to the other lenses as well as theimage sensor 12, and that the automatic focusing of thecamera 10 would be carried out without further adjustment to thelens system 14. - Still with reference to
FIG. 1 , amirror 20 is positioned between theimage side 16 b of thelens system 14 and theimage sensor 12. Themirror 20 is located at an angle such that an image located along theoptical axis 22 is observed through thefixed lens system 14 and is reflected toward theimage sensor 12. This is illustrated most clearly by the path of theoptical axis 22 of thelens system 14 which is reflected by themirror 20 toward theimage sensor 12 generally along apath 32 normal to the face of theimage sensor 12. - An
actuator 24 is connected to themirror 20 that moves themirror 20 relative to thelens system 14 to change a distance between thelens system 14 and theimage sensor 12 to adjust an object focal length between an object (not shown inFIG. 1 ) and thecamera 10. As shown inFIG. 1 , preferably themirror 20 is mounted on anarm 28 having apivot point 30 located along anoptical axis 32 of theimage sensor 12. Theactuator 24 is connected to themirror 20 via thearm 28. Preferably, thepivot point 30 is located on an opposite side of theimage sensor 12 from themirror 20 and is offset sufficiently such that pivoting movement of thearm 28 approximates linear movement over the range of motion for themirror 20. - In a preferred embodiment, the
actuator 24 is a voice coil. However, those skilled in the art will understand from the present disclosure that theactuator 24 may be constructed as a solenoid or a stepper motor with a lead screw or using any other suitable controllable displacement means. In the first preferred embodiment, thepivot point 30 is formed by a pin connection. However, it will be recognized by those skilled in the art from the present disclosure that the pivot could be provided by a flexible member such as a leaf spring or a living hinge which would provide the additional advantage of biasing thearm 28 in a given direction to maintain greater stability of themirror 20, if desired. - As shown in
FIG. 1 , when theactuator 24 is actuated, thearm 28 can be adjusted to a second position, shown in dashed lines as 28′, moving themirror 20 to a second position shown as 20′ to adjust the length of the optical path between thelens system 14 and theimage sensor 12. This causes the object focal point to vary in a predictable manner as explained in more detail below. - In the preferred embodiment, the focusing mechanism is used in conjunction with a line-scan camera system, such as a line-scan CCD camera as the
image sensor 12. This is due to the fact that if the object plane and the nodal plane of thelens system 14 are parallel, then the image plane at theimage sensor 12 must also be parallel to both the object and nodal planes in order for a complete image to be in focus. The pivoting of themirror 20 in the first preferred embodiment causes the sensor plane to be non-parallel to the lens nodal plane resulting in an out-of-focus condition for all except a single line in the sensor plane across the face of theimage sensor 12. However, as long theimage sensor 12 is a single-line sensor located at this line of perfect focus, then theimage sensor 12 will see the object without distortion. This is especially useful for scanning applications where a single scan line is generally being observed aid imaged by thecamera 10. - Referring now to
FIG. 2 , a second preferred embodiment of the automatic focusingcamera 110 is shown. The second preferred embodiment of the automatic focusingcamera 110 is similar to thefirst embodiment 10 and like elements have been designated with the same reference numerals. The differences between the automatic focusingcamera 110 of the second preferred embodiment of the invention and the automatic focusingcamera 10 of the first embodiment of the invention are explained in detail below. - In the second preferred embodiment of the invention, the automatic focusing
camera 110 includes amirror 120 which is mounted for generally linear movement parallel to theoptical axis 22 of thelens system 14. Preferably, themirror 120 is connected to alinear actuator 124 for movement of themirror 120 from a first position to asecond position 120′, as shown by dashed lines inFIG. 2 , to change the length of the optical path between thelens system 14 and theimage sensor 12. In the second preferred embodiment of the automatic focusingcamera 110, since theactuator 124 causes themirror 120 to move linearly along a path generally parallel to theoptical axis 22 of thelens system 14, the object, lens and sensor planes all remain parallel such that the image can be focused on the surface of theimage sensor 12. However, the field of view of theimage sensor 12 moves orthogonally to the sensor line as shown inFIG. 3 . This results in a shift of the objectfocal line 123 up or down (for example to the position indicated by 123′) as the focal point moves farther from or nearer to thelens system 14, respectively. As shown by comparing the first position of thelens 120 inFIG. 2 with the objectfocal line 123 inFIG. 3 versus the second position of thelens 120′ inFIG. 2 and the second objectfocal line 123′ inFIG. 3 , this shift becomes apparent. - While in the second preferred embodiment a line-scan camera is also used as the
image sensor 12, it is also possible to utilize a twodimensional image sensor 12 in connection with the second preferred embodiment since the object, lens and sensor planes all remain parallel to the field of view of theimage sensor 12. - In use, the position of the
mirrors cameras imaging sensor 12 and thelens system 14 to vary an object focal point on an object being observed. In the first preferred embodiment, this is accomplished by moving the mirror about thepivot point 30, shown inFIG. 1 , and receiving the image to be scanned on a single line-scan camera, such as a single line CCD camera. In the second preferred embodiment, themirror 120 is moved linearly along a path parallel to anoptical axis 22 of thelens system 14, as shown inFIG. 2 , to adjust the position of themirror 120 in order to focus the object image on theimage sensor 12. - While the preferred embodiments of the invention have been described in detail, the invention is not limited to the specific embodiments described above which should be considered as merely exemplary. Further modifications and extensions of the present invention may be developed, and all such modifications are deemed to be within the scope and spirit of the present invention as defined by the appended claims and all legal equivalents thereto.
Claims (5)
1. An automatic focusing camera, comprising:
an image sensor;
a lens with an object side and an image side;
a mirror disposed between the image side of the lens and the image sensor on an arm that pivots about a first axis that is in a fixed position with respect to the lens, wherein the mirror is located on the arm so that the mirror does not rotate about a second axis passing through the mirror and parallel to the first axis, and wherein the mirror is located on the arm at an angle such that an image observed through the lens is reflected toward the image sensor; and
wherein the arm is movable about the first axis so that the mirror moves relative to the lens to change a distance between the lens and the image sensor and thereby adjust an object focal length between an object and the camera.
2. The automatic focusing camera of claim 1 , further comprising an actuator connected to the mirror that moves the mirror relative to the lens to change the distance between the lens and the image sensor to adjust the object focal length.
3. The automatic focusing camera of claim 1 , wherein the actuator is indirectly connected to the mirror through the arm.
4. The automatic focusing camera of claim 1 , wherein the object side and the image side are on opposite sides of the lens.
5. The automatic focusing camera of claim 1 , wherein the lens is in a fixed position with respect to the image sensor.
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US13/222,580 US20110310289A1 (en) | 2000-02-15 | 2011-08-31 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
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US09/503,817 US6801260B1 (en) | 2000-02-15 | 2000-02-15 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
US13/222,580 US20110310289A1 (en) | 2000-02-15 | 2011-08-31 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
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US11/543,240 Division USRE44005E1 (en) | 2000-02-15 | 2006-10-04 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
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US11/543,240 Expired - Lifetime USRE44005E1 (en) | 2000-02-15 | 2006-10-04 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
US13/222,580 Abandoned US20110310289A1 (en) | 2000-02-15 | 2011-08-31 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
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US09/503,817 Ceased US6801260B1 (en) | 2000-02-15 | 2000-02-15 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
US11/543,240 Expired - Lifetime USRE44005E1 (en) | 2000-02-15 | 2006-10-04 | Automatic focusing camera with moving mirror between fixed lens and fixed image sensor |
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US10726287B2 (en) * | 2015-06-12 | 2020-07-28 | Gachisoft Inc. | Camera and object processing apparatus using same |
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USRE44005E1 (en) | 2013-02-19 |
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