WO2014167042A1 - Sensor having a plurality of focal positions - Google Patents
Sensor having a plurality of focal positions Download PDFInfo
- Publication number
- WO2014167042A1 WO2014167042A1 PCT/EP2014/057240 EP2014057240W WO2014167042A1 WO 2014167042 A1 WO2014167042 A1 WO 2014167042A1 EP 2014057240 W EP2014057240 W EP 2014057240W WO 2014167042 A1 WO2014167042 A1 WO 2014167042A1
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- WO
- WIPO (PCT)
- Prior art keywords
- optical
- light beam
- reading device
- partial beams
- information
- Prior art date
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- 230000003287 optical effect Effects 0.000 claims abstract description 139
- 238000005286 illumination Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 12
- 230000010287 polarization Effects 0.000 claims description 2
- 230000004075 alteration Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000000969 carrier Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000282412 Homo Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10792—Special measures in relation to the object to be scanned
- G06K7/10801—Multidistance reading
- G06K7/10811—Focalisation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/12—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using a selected wavelength, e.g. to sense red marks and ignore blue marks
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
Definitions
- the invention relates to an optical reader for optical information on a support, in particular a banknote, and to a method for reading out optical information on a support, in particular a banknote.
- banknotes can be equipped with machine-readable information.
- information comes, for example, currency, denomination, manufacturing information such as manufacturer, place, date, batch number, piece-specific information such as serial numbers, correlation information, information about piece-individual characteristics of the bill, z. B. distribution of UV fibers in question.
- the information can be stored unencrypted or encrypted.
- the information may be hidden or open.
- Information on banknotes can be stored, for example, by means of electrical circuits, by means of magnetic materials, by means of printing or by means of texturing.
- the information may be electrically detectable, magnetically detectable or optically detectable. Examples of information carriers are RFID chips, magnetic strips and barcodes.
- the invention relates to the class of optically detectable information that can be introduced, inter alia, by means of printing or by means of denazification in the banknote.
- the information can, for example, be stored invisibly in the wavelength range of approximately 400-700 nm which is perceptible for humans.
- Information can be stored microscopically small, with feature sizes below the resolution of the human eye.
- a laser-induced change in the material of a component of the banknote is considered as marking, which is optically detectable with suitable detectors.
- marking which is optically detectable with suitable detectors.
- the transmission and / or reflection property of a substrate of the banknote or another component of the banknote, such as a foil strip or the printing ink of the banknote paper itself can be changed locally or a local material removal can be induced.
- Laser-induced means that the information-containing structures are generated by local action of laser radiation.
- the area on the support in which the hidden optical information is accommodated can be large in comparison to the structures themselves and is typically in the range of one square millimeter up to the entire surface of the support.
- optically detectable information to use special readers.
- readers for the manual feeding of banknotes as well as readers for the automated feeding of banknotes.
- the banknotes are passed past the reader at high speed, in which case the position of the banknote relative to the reading device may be different from reading to reading.
- a disadvantage of reading devices according to the prior art is that the optical system of these readers has only one focal plane, that is, only one plane in which the optical information of the banknote must be arranged in order to image a sharp image on the camera chip.
- the banknote must be close to the focal plane.
- EP 1 496 464 A1 describes an apparatus for optically scanning markings on objects, for example bar codes, with at least two light emitting transmitters and a rotating polygon mirror which directs the light beams of the transmitters onto the markings to be scanned and the light reflected from the markings onto a receiver system directs.
- US Pat. No. 4,808,804 discloses a laser scanning system for reading bar code symbols, in which an emerging laser beam whose working distance and / or reading point size can be changed passes over the symbols to be read. In this case, a cross-sectional area is varied by a laser beam of predetermined dimension and a predetermined distance to the housing opening. In this way, the laser scanning system should be able to read so-called high-density (HID) symbols and LO-D (low density) symbols among the UPC (Universal Product Code) symbols.
- HID high-density
- LO-D low density
- the invention has for its object to provide a reader for optical information on carriers, in particular banknotes, which has a greater depth of field, and to provide a method for reading optical information on a carrier, in particular a banknote, in which the information may be arranged in a region which is larger in relation to the prior art around the focal plane and nevertheless can be read out.
- the object is achieved by an aforementioned optical reader with the features of claim one.
- the optical reader has illumination in the beam path for generating a light beam outgoing from the optical information, and an optical system having at least two spaced apart focal planes, wherein the light beam is split in the optical system into at least two sub-beams each associated with one of the focal planes.
- the optical reading device further comprises at least one image sensor on which the individual sub-beams lead to images of the optical information of different sharpness, and an image processing system which is connected to the at least one image sensor and determines the sharpness of an image and determines an image with the highest sharpness.
- the two focal planes are preferably just so far apart that the depths of focus of the individual focal planes overlap and thus form a total depth of field that is slightly less than the sum of the two individual depths of field.
- the optical information can be read out on the carrier in a larger than the prior art determined by the depth of field range.
- a positional tolerance of the carrier in the reading device in which the information can still be extracted is increased. This is particularly advantageous in microscopic applications when structures of less than 50 ⁇ m must be imaged. In such applications, conventional reading devices are too shallow in depth.
- the optical information is optically detectable and / or microscopic and / or machine-readable.
- the optical information may in particular comprise a security feature.
- Visually detectable means that the structures that form the information can be illuminated by means of illumination and imaged by means of an optical system and can be supplied to an evaluation by image processing.
- Microscopically detectable information on carriers, in particular bank notes, means that the information is stored in structures whose typical lateral size is below 50 ⁇ m.
- the information is machine-readable. This means that previously stored data can be extracted and further processed by an image processing and evaluation system.
- the reader according to the invention makes it possible to read machine-readable information on carriers, in particular banknotes.
- the object is achieved by a method for reading out optical information on a carrier, in particular a banknote, by illuminating the optical information, generating a light beam departing from the optical information, the light beam through at least two mutually spaced focal planes splitting optical system is divided into at least two sub-beams, each associated with one of the focal planes, the sub-beams on at least one image sensor to images of the optical information different sharpness lead, the different sharpness are determined and the optical information is evaluated based on the sharpness of the images.
- the method is particularly suitable for carrying out with one of the above-mentioned reading devices.
- the optical systems according to the invention make it possible to divide the light beam outgoing from the optical information into individual partial beams.
- the optical readers according to the invention can be subdivided into three categories, depending on the manner in which the light beam originating from the optical information is split up into partial beams.
- the term "splitting" is understood here to mean a multiplicity of different processes.
- the division of the light beam in a first category of the optical systems takes place by decomposition with respect to the wavelength; in the second category, the light beam is divided into equivalent partial beams along a cross section of the light beam. In a third category, the light beam is split into sub-beams transversely to the direction of the beam path. The sub-beams are assigned in different ways to an individual focal plane.
- the first category of optical systems makes use of the dispersion property of optical components.
- Dispersive components have different refractive indices for different wavelengths. The individual wavelengths are thus broken to different degrees at the interfaces, for example between air and medium.
- An optical system comprising the dispersive component has a first focal plane for a first wavelength range and a second focal plane spaced therefrom for a second wavelength range.
- the illumination provides at least two different wavelengths
- the optical system comprises a dispersive component providing partial beams separated by at least two wavelengths and the image sensor as at least the two wavelengths of discriminating color image sensor having at least two color channels is trained.
- the image sensor is an image of the optical information in the associated Wavelength range focused.
- the image sensor must necessarily be able to distinguish images of different wavelength ranges from each other, that is, the image sensor is a color image sensor, and it can discriminate wavelength ranges.
- a light beam emanating from the optical information is divided at each point along its cross section, so that at least two partial beams emerge, at least one of which is diverted such that the optical path length of the different partial beams in the optical system is different ,
- a beam splitting device is provided in the optical system for this purpose.
- the beam splitting device preferably comprises a beam splitter which splits the light beam into at least two individual sub-beams of different optical path length, and each of the two sub-beams strikes a separate image sensor.
- This embodiment is structurally particularly simple and also provides separate, easy-to-evaluate images. It is also conceivable to use a common image sensor and to image each of the images on a separate subarea of the image sensor. For this purpose, a mirror for deflecting onto a lens can be provided in one of the two partial beams.
- the beam splitting device comprises at least two juxtaposed, partially transparent reflector planes which divide the light beam into partial beams of different order.
- the reflection planes can be arranged parallel or at an angle at an angle to each other. By changing the angle, the various images of the optical information can be imaged on the image sensor superimposed or separated from each other.
- the partial beams fed to the at least one image sensor can be arranged on the side of the reflection planes facing away from the focal planes or facing them.
- the beam splitting device comprises a birefringent medium which divides the light beam into two partial beams depending on the polarization.
- the light beam is split transversely to the direction of the light beam into at least two partial beams.
- a component in the beam path of the reading device is preferably provided for this, which splits the light beam into at least two partial beams transversely to the direction of the light beam and each partial beam impinges on another portion of the image sensor.
- the component has a prism, designed either as a transmission prism or as a reflection prism.
- the component has a plane-parallel plate.
- the component has a stepped plane-parallel plate.
- a distance of the separate focal planes is a maximum of 10 mm.
- the size of at least parts of the structures of the optical information is advantageously less than 50 ⁇ m.
- Fig. 1 is a schematic illustration of a reading device according to the prior
- 3a, 3b, 3c show an embodiment of the reading device according to the invention with a lens not corrected for chromatic aberration, 4a, 4b, a reader according to the invention with introduced into the beam path plane-parallel plates, Fig. 5 shows a third embodiment of the reader according to the invention with a beam splitter and two lenses of different focal lengths, Fig. 6 shows a fourth embodiment of the reader according to the invention with two mutually parallel teillicht fashion understanden reflection planes in the beam path .
- FIG. 7 shows a fifth embodiment of the reading device according to the invention with a part-light-permeable reflection plane and a reflection plane and a lens introduced into the beam path,
- FIG. 8 shows a sixth embodiment of the reading device according to the invention with a plane-parallel plate introduced into a part of the beam path
- FIG. 9 shows a seventh embodiment of the reading device according to the invention with a stepped plane-parallel plate which is introduced into the beam path
- FIG 10 shows an eighth embodiment of the reading device according to the invention with a beam splitter inserted into the beam path and a mirror.
- Fig. 1 shows schematically the structure of a known in the prior art reading device. 1
- the reading device 1 shown in FIG. 1 is suitable for reading out optical information 7 applied to banknotes.
- Optical information 7 means here on the banknote deposited microscopic, not visible to the human eye, optically detectable information with structures with a lying below the resolution of the human eye lateral size of about 50 ⁇ .
- the banknotes are automatically fed to the reader 1.
- the banknotes are guided past the reader 1 at high speed and at short time intervals from one another.
- the reader 1 comprises a digital camera 2 with a camera chip 4 and an optical system 3, which is usually constructed from a plurality of lenses.
- the optical system 3 in turn has a focal plane 40.
- the banknote is guided past the optical system 3 as exactly as possible in the focal plane 40 and backlit there by means of a lighting 5.
- the light beam leaving the banknote strikes the camera chip 4 after passing through the optical system 3 and forms a sharp image of the information there.
- the image is processed by means of an image processing system (not shown) connected to the camera chip 4.
- the optical system 3 has a depth of field d 0 .
- the depth of field d 0 is a tolerance range that extends symmetrically on both sides of the focal plane 40.
- the optical information of a banknote guided past the optical system 3 within the depth of field d 0 is still imaged as a sharp image on the camera chip 4. At least the image is so sharp that the optical information 7 is recognizable to the image processing system and can be usefully supplied to an evaluation. To generate a sharp image 8, it is therefore sufficient to pass the banknotes within the depth of field d 0 along the focal plane 40 on the reading device 1.
- the focal planes 40, 41 of the optical system 3 are arranged so far apart from each other that overlap their associated depth of field d 0 , di in the direction of the beam path.
- Fig. 2 shows the arrangement according to the invention schematically.
- the two depths of field d 0 , di of the optical system 3 according to the invention add up to approximately twice the total depth of field compared to the known optical system.
- optical information can also be read from inaccurately fed to the reader 1 according to the invention banknotes.
- different embodiments of readers 1 according to the invention are presented, whose optical systems 3 each comprise two or more focal planes 40, 41 oriented perpendicular to the beam path and spaced apart parallel to one another.
- Different categories of optical systems 3 can be distinguished. In each of the systems, the light beam originating from the information to the optical system is shared. The division takes place in different ways.
- a first category relates to the optical system 3 shown in FIGS. 3 and 4, which is based on the targeted utilization of the dispersion properties of optical components of the optical system 3.
- a light beam which extends from the optical information and covers several wavelengths, is passed through a dispersive medium.
- the dispersive medium has different refractive indices for different wavelengths. As a result, the light beam is split into sub-beams according to the wavelength.
- the second category relates to the optical systems 3 shown in Figs. 5, 6, 7, 10.
- the light beam outgoing from the optical information is divided, and the sub-beams impose a different optical path length to a common lens 6 or two separate lenses 6, 6a of the same focal length or a corresponding lens system.
- This category can be distinguished with regard to the type of division of the light beam, namely by a beam splitter which generates two partial beams, or by juxtaposed, partially mirrored reflection planes which theoretically generate partial beams of arbitrarily high order.
- parts is meant here that the light beam is divided along its entire cross section perpendicular to the direction of the light beam, ie at each point of the cross section in each case both partial beams.
- the light beam is split into partial beams.
- Columns are here understood to mean a division of the light beam transversely to the direction of the beam path into a plurality of partial beams. That is, a contiguous portion of the cross section of the light beam is split into a sub-beam and a disjunctively contiguous portion is split off into another sub-beam.
- 3a, 3b, 3c show a structurally simple form of the reading device 1 according to the invention with a lens 6 which is not corrected for chromatic aberration. In this illustration, the lens 6 is also representative of a plurality of lenses and / or additional lens packages.
- the light beam emerging from the optical information 7 shown as an arrow in the object space is, if it lies in a first wavelength range ⁇ -1, sharply imaged on the camera chip 4 as image 8, if the optical information 7, as shown in FIG the first focal plane 40 is positioned.
- Wavelength range is understood to mean a single wavelength here as well.
- the other two on both sides of the lens 6 most closely spaced from her dashed planes represent the focal length of the lens 6.
- the focal lengths are also shown in Figures 4a, 4b.
- the optical information 7 shown in the second focal plane 41 is arranged by the arrow.
- the image 8 of the optical information 7 imaged with light from the first wavelength range ⁇ -1 is imaged out of the second focal plane 41 on the camera chip 4.
- the optical information 7 is backlit with light of a second wavelength range ⁇ 2 , and light of the second wavelength range ⁇ 2 is emitted as a light beam from the optical information 7 to the lens 6.
- the first wavelength range ⁇ -1 is different from the second wavelength range ⁇ 2 .
- the optical information 7 arranged in the second focal plane 41 is sharply imaged on the camera chip 4 because the lens 6 which is not corrected for chromatic aberration has a longer focal length for the second wavelength range ⁇ 2 than for the first wavelength range ⁇ 1 .
- the illumination 5 of the optical reading device for this embodiment necessarily comprises at least the first and second wavelength ranges ⁇ 1 , ⁇ 2 .
- the camera chip 4 is a color sensor chip which discriminates the wavelength ranges ⁇ 1 , ⁇ 2 , that is, the color sensor chip can separately record images associated with different wavelength ranges ⁇ 1 , ⁇ 2 and supply the acquired separate images to a unit for evaluation
- FIGS. 4a and 4b show a second exemplary embodiment of the optical reading device 1 according to the invention.
- the operation of this reading device 1 is based on the fact that a dispersive material in the form of a translucent plane-parallel plate 43 is introduced into the beam path.
- the lens 6 can be corrected for chromatic aberrations or not corrected. In the second case, even more widely spaced focal planes 40, 41 would be possible. Chromatic aberration is in the embodiment in Figs. 4a, 4b not taken into account.
- the optical information 7 in the second wavelength range ⁇ 2 of the light from the second focal plane 41 is imaged sharply on the camera chip 4 because the plane-parallel plate 43 has a different refractive index ⁇ 2 for the second wavelength range ⁇ 2 than for the second wavelength range ⁇ 2 first wavelength range ⁇ - ⁇ and therefore the refraction angles are different.
- the illumination 5 of the reading device 1 according to the invention comprises both the first wavelength range ⁇ -1 and the second wavelength range ⁇ 2 .
- the camera chip 4 is in turn a color sensor chip and can discriminate the two wavelength ranges ⁇ - 1 , ⁇ 2 .
- FIG. 5 shows a third embodiment of the reading device 1 according to the invention, which is assigned to the second category by dividing the light beam emerging from the optical information 7.
- the light beam is fed to a beam splitter 50.
- the beam splitter 50 is located in Fig. 5, between the optical information and two identical lenses 6, 6a. But it can also be placed between a single lens 6 and two camera chips 4, 4 a.
- Each of the two lenses 6 6a is each a camera chip 4, 4a arranged downstream in the beam path. If the optical information 7 is located in the first focal plane 40, then it is sharply imaged on the camera chip 4; if the optical information is located in the second focal plane 41, it is sharply imaged on the second camera chip 4a.
- FIG. 6 shows a fourth embodiment of the optical reading device 1 according to the invention with a camera chip 4 and a lens 6.
- the optical system 3 comprises not only the lens 6 but also two reflection planes 60, 61 arranged side by side, which are arranged parallel to one another.
- the two reflection planes 60, 61 are arranged between the optical information 7 and the lens 6.
- the two reflection planes 60, 61 split the light beam into sub-beams of different orders. First order light is transmitted through the first reflection plane 60 and subsequently also transmitted through the second reflection plane 61.
- the second-order light is the light transmitted through the first reflection plane 60 and subsequently reflected by the second reflection plane 61 and then reflected by the first reflection plane 60 and then transmitted through the second reflection plane 61. Accordingly, the light of higher orders affects further reflections. The higher the order, the weaker the intensity of the light.
- the first-order light is sharply imaged on the camera chip 4. If an object is located in the first focal plane 40, the second-order light is sharply imaged on the camera chip 4.
- the optical system 3 therefore also has a third, fourth, etc. focal plane. Disadvantageously, the light of higher orders is weaker than the light of lower orders. Moreover, the image 8 of the optical information 7 is imaged on the camera chip 4 for each of the orders at the same location.
- 7 shows a fifth embodiment of the optical reading device 1 according to the invention with two reflection planes 70, 71 arranged next to one another, wherein the first reflection plane 70 is made partially transparent and the second reflection plane 71 almost completely reflects the incident light.
- the two reflection planes 70, 71 are arranged between the optical information 7 and the lens 6. However, they can also be placed between the lens 6 and the camera chip 4.
- the two reflection planes 70, 71 split the light beam into partial beams of different orders.
- the first order light is the light reflected from the first reflection plane 70
- the second order light is the light of the sub-beam transmitted through the first reflection plane 70 and subsequently reflected by the second reflection plane 71 and subsequently transmitted through the first reflection plane 70. Partial beams of higher orders concern further reflections. The higher the order, the weaker the intensity of the light is also in this case. If optical information 7 is located in the second focal plane 41, the first-order light is sharply imaged on the camera chip 4.
- the second-order light is sharply imaged on the camera chip 4.
- the sub-beams of different orders are superimposed as images 8, 8a on the camera chip 4 at the same location.
- VerLiteungs grade and thus the reflectivities of the two reflection planes 70, 71 can be adjusted so that the partial beams of the first two orders on the camera chip 4 are about equally strong.
- Fig. 8 relates to a sixth embodiment of the optical reader.
- the optical system comprises a plane-parallel sub-plate 80, which, however, in contrast to the plane-parallel plate of FIG. 4, is introduced only into a subregion of the beam path.
- the plane-parallel sub-plate 80 is in this embodiment between the optical information 7 and the lens 6. It can also be placed between the lens 6 and the camera chip 4.
- the plane-parallel sub-plate 80 causes a first sub-region of the camera chip 4 to be assigned to the first focal plane 40 and another sub-region of the camera chip 4 to be assigned to the second focal plane 41.
- the optical information 7 can only be read completely in this reading device 1 if the optically readable information is applied twice identically to the banknote and is in each case located completely in a subregion of the camera chip 4.
- Fig. 9 shows a modification of the embodiment in Fig. 8, in which case a plane-parallel step plate 90 is introduced into the beam path.
- the plane-parallel step plate 90 is in this embodiment between the optical information 7 and the lens 6. It can also be placed between the lens 6 and the camera chip 4.
- the plane-parallel step plate 90 causes each one part of the camera chip 4 is assigned to a respective other focal plane 40, 41, 42.
- the information 7 can only be read out completely in this optical reader 1 if it is repeated identically in triplicate on the banknote and is completely reflected as image 8, 8a, 8b in each case in one of the subregions of camera chip 4.
- FIG. 10 shows an eighth embodiment of the optical reader 1 with an optical system 3 comprising a beam splitter 50 and a mirror 100.
- Beam splitter 50 and mirror 100 are again in the beam path between optical information 7 and the lens 6. However, they can also be placed between the lens 6 and the camera chip 4.
- the beam splitter 50 splits the light beam into two sub-beams, while one of the sub-beams on the way to the camera chip 4 passes through a longer optical path than the other sub-beam.
- the two partial beams are imaged on the camera chip 4 in an offset manner, thereby two images 8, 8a of the same subarea of the banknote are imaged side by side on the camera chip, the focal planes 40, 41 of the two images 8, 8a differing.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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GB1515341.4A GB2527437A (en) | 2013-04-11 | 2014-04-10 | Sensor having a plurality of focal positions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE201310206360 DE102013206360A1 (en) | 2013-04-11 | 2013-04-11 | Sensor with several focal positions |
DE102013206360.1 | 2013-04-11 |
Publications (1)
Publication Number | Publication Date |
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WO2014167042A1 true WO2014167042A1 (en) | 2014-10-16 |
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PCT/EP2014/057240 WO2014167042A1 (en) | 2013-04-11 | 2014-04-10 | Sensor having a plurality of focal positions |
Country Status (3)
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DE (1) | DE102013206360A1 (en) |
GB (1) | GB2527437A (en) |
WO (1) | WO2014167042A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6208465B1 (en) * | 1997-04-25 | 2001-03-27 | Galore Scantec Ltd. | Method and apparatus for imaging an object by diffractive autofocus |
US20060060653A1 (en) * | 2004-09-23 | 2006-03-23 | Carl Wittenberg | Scanner system and method for simultaneously acquiring data images from multiple object planes |
US20060171041A1 (en) * | 2005-01-31 | 2006-08-03 | Olmstead Bryan L | Extended depth of field imaging system using chromatic aberration |
US20130043314A1 (en) * | 2011-08-16 | 2013-02-21 | Intermec Ip Corp. | Motion tolerant bar code reader |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4808804A (en) * | 1987-01-28 | 1989-02-28 | Symbol Technologies, Inc. | Bar code symbol readers with variable spot size and/or working distance |
DE10331467A1 (en) * | 2003-07-11 | 2005-02-10 | Sick Ag | Device for optically scanning objects, in particular markings |
-
2013
- 2013-04-11 DE DE201310206360 patent/DE102013206360A1/en not_active Ceased
-
2014
- 2014-04-10 WO PCT/EP2014/057240 patent/WO2014167042A1/en active Application Filing
- 2014-04-10 GB GB1515341.4A patent/GB2527437A/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6208465B1 (en) * | 1997-04-25 | 2001-03-27 | Galore Scantec Ltd. | Method and apparatus for imaging an object by diffractive autofocus |
US20060060653A1 (en) * | 2004-09-23 | 2006-03-23 | Carl Wittenberg | Scanner system and method for simultaneously acquiring data images from multiple object planes |
US20060171041A1 (en) * | 2005-01-31 | 2006-08-03 | Olmstead Bryan L | Extended depth of field imaging system using chromatic aberration |
US20130043314A1 (en) * | 2011-08-16 | 2013-02-21 | Intermec Ip Corp. | Motion tolerant bar code reader |
Also Published As
Publication number | Publication date |
---|---|
DE102013206360A1 (en) | 2014-10-16 |
GB201515341D0 (en) | 2015-10-14 |
GB2527437A (en) | 2015-12-23 |
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