EP2490185B1 - Dispositif et procédé destinés à l'examen optique de documents de valeur - Google Patents

Dispositif et procédé destinés à l'examen optique de documents de valeur Download PDF

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Publication number
EP2490185B1
EP2490185B1 EP12001199.4A EP12001199A EP2490185B1 EP 2490185 B1 EP2490185 B1 EP 2490185B1 EP 12001199 A EP12001199 A EP 12001199A EP 2490185 B1 EP2490185 B1 EP 2490185B1
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EP
European Patent Office
Prior art keywords
laser diodes
illumination pattern
given
illumination
detection
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EP12001199.4A
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German (de)
English (en)
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EP2490185A3 (fr
EP2490185A2 (fr
Inventor
Wolfgang Deckenbach
Michael Bloss
Martin Clara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP2490185A3 publication Critical patent/EP2490185A3/fr
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    • 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
    • G07D7/121—Apparatus characterised by sensor details
    • 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
    • G07D7/20—Testing patterns thereon

Definitions

  • the present invention relates to a device and a method for optically examining documents of value.
  • Documents of value are understood to mean objects in the form of cards or, in particular, objects in the form of sheets which, for example, represent a monetary value or an authorization and/or should not be able to be produced by unauthorized persons at will. They therefore have features that are not easy to produce, in particular to copy, the presence of which is an indication of authenticity, i.e. production by an authorized body.
  • Important examples of such documents of value are chip cards, coupons, vouchers, checks and, in particular, banknotes.
  • Documents of value are often optically examined to identify their type and/or their condition and/or to check for authenticity.
  • the ambient light could be used for the examination, but such examinations are subject to large errors due to the fluctuations in the properties of the ambient light.
  • Devices are therefore used for the examination, which have an illumination device for illuminating at least a part of a section of a document of value given by a detection area of the device with optical radiation of predetermined properties and a detection device for detecting optical radiation from the detection area, in particular one illuminated by the illumination device Document of value, comes, owns.
  • light sources such as halogen lamps can be used for illumination, these consume a lot of power compared to the radiant power emitted in a desired spectral range and therefore require adequate cooling. They also have the disadvantage that they do not have a very long service life. In addition, these light sources have a not inconsiderable space requirement.
  • DE 10 2004 914 541 B3 describes an optical system for generating an illuminated structure with a length on a surface of a material that is moved relative to the structure, at least part of the surface of the material being reflective, with an illumination device having a plurality of lines arranged next to one another at a distance from the surface of the material
  • Light sources emit light to generate the structure, wherein a detection device with at least one detector arranged at a distance from the surface of the material detects light reflected from the surface of the material, the structure as an illumination strip with a length orthogonal to the surface of the material extending width is formed, wherein the lighting strip is arranged outside of a lying in the direct or in the deflected beam path focal point of the light emitted by the light sources, wherein the lighting device consists of several together rows of modules, each with several light sources arranged side by side.
  • EP1 501162 A2 describes a phased array of oxide-confined VCSELs and a method of forming the phased array of oxide-confined VCSELs.
  • VCSELs in the array are designed to be addressed simultaneously, so radiation from multiple VCSELs can be used to increase the light intensity at a point.
  • high gain coupling regions disrupt the continuity of the oxide wall surrounding each VCSEL opening. The high gain coupling regions connect adjacent VCSELs in the VCSEL array, allowing mode locking between adjacent lasers and the output of a coherent light beam.
  • the present invention is therefore based on the object of creating a device for the optical examination of documents of value which, with a compact design, allows good illumination of a document of value to be examined, and to specify a corresponding method.
  • the object is also achieved by a method having the features of claim 13 and in particular a method for optically examining a document of value in a detection area, in which the document of value is illuminated with at least one surface-emitting laser diode.
  • optical radiation can be detected from at least part of the detection area, which is caused by the illumination of the value document occurs.
  • This can in particular be luminescence radiation excited in the value document, from the value document act reflected or passed through this optical radiation.
  • the detection device can be arranged relative to the illumination device and the detection area in particular in such a way that its radiation entrance is on the same side of the value document from which it is illuminated, or on the opposite side.
  • the detection device can be arranged in such a way that an examination with reflected or transmitted light or in reflection or transmission is possible.
  • the examination can take place when the document of value is stationary relative to the examination device and in particular the illumination device.
  • the value document can also be moved during the illumination.
  • the invention therefore also relates to a device for processing documents of value, also referred to below as a document of value processing device, with an examination device according to the invention and a transport device for moving a document of value through the detection area at a predetermined transport speed.
  • the transport speed can be specified in particular as a function of properties of the examination device or the transport device. In the case of a sequential detection, an image of the section of the document of value moved through the detection area can thus be obtained.
  • the invention turns away from the conventional types of lighting. So while it is conceivable for lighting instead of halogen lamps to use conventional edge-emitting laser diodes (so-called “edge emitting laser diodes”), but radiate this optical radiation with a very inhomogeneous and not simply symmetrical intensity distribution. This can affect the examination of the document of value.
  • a surface-emitting laser diode is understood more precisely as a vertically surface-emitting laser diode or in particular a semiconductor component also known as a “vertical cavity surface emitting laser” (VCSEL), the laser resonator of which can be coupled out with its coupling-out direction in the radiation from the laser resonator is aligned at least approximately orthogonally to the surface of the component or chip.
  • VCSEL vertical cavity surface emitting laser
  • the laser resonator of such surface-emitting laser diodes can have reflection devices running at least approximately parallel to the surface, for example reflection layers or layer systems.
  • these can be manufactured with large exit windows compared to edge-emitting laser diodes, so that the emitted beam is little or not affected by diffraction at the edges.
  • surface-emitting laser diodes have a beam profile that is, to a good approximation, rotationally symmetrical, resulting in beam shaping is made much easier with simple optical elements compared to edge-emitting laser diodes.
  • the emission wavelength range is determined more strongly by the laser resonator than in the case of edge-emitting laser diodes. This permits narrower emission wavelength ranges and leads to greater thermal stability of the emission wavelength range.
  • the full width at half maximum (FWHM) of the emission spectrum is less than 1 nm.
  • the spatial coherence of the emitted radiation is also lower than in the case of edge-emitting laser diodes, so that speckle patterns can be largely or completely avoided on a document of value illuminated with the laser diode.
  • the surface-emitting laser diodes Due to the favorable beam shape of the surface-emitting laser diodes, they can advantageously be combined with one another for lighting purposes, so that in the method, at least one further surface-emitting laser diode is used for lighting in addition to the laser diode. It is therefore provided in the examination apparatus that the illumination device for generating a predetermined illumination pattern in the detection area has at least one additional surface-emitting laser diode and the control device is designed to drive the additional laser diode.
  • the laser diodes are formed in a device or chip. Such training is only at Surface-emitting laser diodes easily possible and has the advantage that the production of a large array of laser diodes can be done easily. A further advantage can be seen in the fact that only one component needs to be handled as the radiation source when assembling the examination device, which considerably simplifies production.
  • More than 50 laser diodes are particularly preferably arranged on a component.
  • the laser diodes can be actuated by means of the control device in different ways.
  • the lighting device has at least two groups of surface-emitting laser diodes, which include the aforementioned surface-emitting laser diodes, and the laser diodes in each group can be controlled independently of those in the other group.
  • the control device is designed to control one group of laser diodes separately from the control of the other groups of laser diodes.
  • the document of value can then be illuminated with at least two groups of surface-emitting laser diodes that contain the laser diode, the laser diodes of one group being driven separately from those of the other group. In this way, a temporal and spatial variation of the illumination pattern is possible by controlling the groups, which offers the advantage of greater variability of the illumination.
  • the laser diodes allow such a control.
  • the control device must be able to drive the groups independently of one another, it being possible for the two groups of laser diodes to be driven coupled, of course, for example by programming the control device.
  • the arrangement of the laser diodes and their control can largely determine the shape of the illumination pattern if only simple illumination optics, i.e. in particular illumination optics with at least approximately an optical axis folded by deflection elements in the area of the beam path, are rotationally symmetrical optical components such as example lenses, is used.
  • the use of only one such illumination optics simplifies and reduces the cost of manufacture of the illumination device.
  • An illumination device with a plurality of surface-emitting laser diodes formed in a chip or component can advantageously be used to generate an areal illumination pattern due to the shape of the beam profile of the laser diodes.
  • the examination device is preferably designed to illuminate a predetermined area with an illumination pattern whose location-dependent intensity variation over the area illuminated by the laser diodes is less than 20% of the maximum intensity of the illumination pattern.
  • the laser diodes can be controlled in such a way that the laser diodes illuminate a given area of the document of value with an illumination pattern whose location-dependent intensity variation over the area is less than 20% of the maximum intensity of the illumination pattern.
  • Such illumination is particularly homogeneous and thus facilitates reliable detection of features.
  • the predetermined area preferably has a content greater than 0.5 mm 2 .
  • this homogeneity can be achieved by using suitable optical components or homogenization devices in the examination device.
  • the surface emitting laser diodes are arranged relative to one another to illuminate a given area with an illumination pattern such that the illumination pattern produced thereby has a location-dependent intensity variation over the area of less than 20% of the maximum intensity of the illumination pattern.
  • the use of special optical components and in particular the use of homogenization devices such as diffusers, diffractive optical elements or light guides, which reduce the intensity of the emitted optical radiation, can be avoided.
  • the examination device therefore particularly preferably has no homogenization elements such as, for example, diffusers, light guides or microlens arrangements for homogenization.
  • the center-to-center spacing of the next-neighboring surface-emitting laser diodes of the illumination device is preferably less than 150 ⁇ m
  • the laser diodes can be arranged in matrix form in the examination device. In particular, they are then arranged on the grid points of a rectangular or square grid. This allows a particularly simple production of a laser diode array on a chip, in particular since the corresponding signal connections can be easily designed if the laser diodes can be driven individually. In addition, a particularly simple control can take place with this arrangement.
  • the laser diodes are arranged on the points of a hexagonal point lattice. This arrangement has the advantage that a particularly dense arrangement of the laser diodes can be achieved in a simple manner, thus enabling a particularly homogeneous illumination pattern.
  • the illumination pattern in the detection area or on the document of value can be determined, at least in terms of its shape, essentially by the arrangement of the emitting laser diodes.
  • the control device is therefore preferably designed to control only a portion of the laser diodes to emit optical radiation in order to generate a predetermined illumination pattern.
  • the laser diodes are preferably driven to emit optical radiation, so that a predetermined illumination pattern is generated.
  • This embodiment has the advantage that, depending on the design, the illumination pattern changes only a change of the control device is necessary. If this is programmable, which is preferred, only the program needs to be changed.
  • the control device is designed to control the laser diodes as a function of a signal or data stored in the control device in such a way that the same illumination pattern is applied in the detection area depending on the signal or the data different predetermined locations can be generated.
  • the laser diodes can then be controlled as a function of a signal or data in such a way that the same illumination pattern can be generated at one of at least two different locations as a function of the signal or the data.
  • the signal can, for example, be read in by an external data input device via an interface or transmitted by a device of the value-document processing device that contains the examination device.
  • the activation of the laser diodes can consist in particular in that only some of the laser diodes are switched on or off.
  • the control device can control the surface-emitting laser diodes in such a way that an extension of a detection area of the detection device in the transport direction is smaller than the extension of the illumination pattern in the transport direction and that the illumination pattern, viewed in the transport direction, extends further in relation to the detection area than against the transport direction.
  • the detection area is understood to mean that section of the detection area from which, in particular apart from scattered radiation alone, the detection device can receive optical radiation for detection.
  • a signal or data about the transport direction can be made available to the control device in the manner specified above, which controls the laser diodes as a function of the signal or the data. In this way, two things can be achieved at the same time.
  • the setting of the examination device can be set automatically when installed in the value-document processing device as a function of the transport device by transmitting corresponding signals, for example from a drive of the transport device or another device of the value-document processing device to the control device or entered manually via an interface.
  • the examination device can therefore be designed and used as an easily configurable module.
  • control can be switchable in particular between two or more illumination pattern positions.
  • control device in the examination apparatus can be designed to control the laser diodes in such a way that an illumination pattern that changes over time during illumination is generated in the detection area. With the procedure it is it is then preferred that the laser diodes be driven to produce a time-varying illumination pattern during illumination.
  • the change over time can in particular be predetermined, for example by a corresponding design and/or programming of the control device.
  • the illumination pattern can be changed in any way, in particular the shape of the illumination pattern can be changed.
  • the laser diodes are driven in such a way that a predetermined illumination pattern is moved in a predetermined direction at a predetermined speed.
  • the control device is then designed to control the laser diodes in such a way that a predetermined illumination pattern is moved in a predetermined direction at a predetermined speed. The movement only needs to take place for a predetermined period of time, for example until the detection area has been swept over once by the illumination pattern. It is further assumed that the laser diodes are suitably arranged to produce the illumination pattern. This embodiment has a number of advantages since it can be used for different purposes.
  • this embodiment makes it possible to capture a one-dimensional or two-dimensional image sequentially.
  • the detection device of the examination device only needs to be designed in such a way that it detects optical radiation coming from the detection area integrally or only one-dimensionally in a direction transverse to the direction of movement of the illumination pattern.
  • An integral detection is understood to mean a detection that is not spatially resolving at a given point in time.
  • the examination device can be designed in particular to generate a rectangular, in particular linear, illumination pattern.
  • the examination device can be used in particular for detecting one- or two-dimensional barcodes by moving the illumination pattern.
  • the document of value can rest during the detection.
  • the movement speed of the illumination pattern can differ from the transport speed.
  • the document of value is preferably moved in a transport direction at a transport speed, the direction being the transport direction and the speed being the transport speed.
  • the processing device for processing documents of value is then the Transport device designed to move a document of value through the detection area at a predetermined transport speed, and the control device is designed to control the laser diodes in such a way that the illumination pattern is moved at the transport speed in the transport direction.
  • this embodiment allows an area of the document of value examined, in particular an optical security feature, to be tracked during the detection, so that an examination is possible even at very high transport speeds.
  • the examination device for the control device to be designed to generate an illumination pattern in a predetermined part of the detection area as a function of position signals from a position detection device.
  • the laser diodes are controlled in such a way that an illumination pattern is generated in a predetermined part of the detection area as a function of position signals from a position detection device.
  • This embodiment has the advantage that a device for determining the position of a document of value or the position of a feature to be examined optically can be used to generate the position signal reflecting the position, in particular relative to the examination device, and that precisely this feature can be determined as a function of this position signal can be illuminated and examined.
  • the amount of data occurring when the entire document of value is examined can be greatly reduced, so that an examination can be carried out more quickly and an evaluation device for evaluating the detection results can be constructed more simply.
  • the detection device for spatially resolved detection of optical radiation is formed in at least one predetermined spectral range, a considerable reduction in data and an increase in data processing speed can be achieved when tracking the feature.
  • the detection device in the examination apparatus can be designed for spatially resolved detection of optical radiation in at least one predetermined spectral range and the control device can be designed to control the laser diodes in such a way that a variation in sensitivity of the detection device for the optical Radiation in the spectral range is at least partially compensated depending on the location.
  • the laser diodes are controlled in such a way that a variation in sensitivity of a detection device for spatially resolved detection of optical radiation in at least one predetermined spectral range as a function of location is at least partially compensated. In this way, even after a long period of time, the illuminance can be adjusted locally to the sensitivity of the detection device, so that a precise optical examination is also made possible over the long term.
  • the laser diodes can be operated as continuously luminous or pulsed radiation sources, for which purpose the control device is then designed accordingly.
  • a value document processing device 10 in 1 which includes a device for the optical examination of documents of value 12, in the example of banknotes, has an input compartment 14 for the input of documents of value 12 to be processed, a singler 16, which can access documents of value 12 in the input compartment 14, a transport device 18 with a switch 20, and along a transport path 22 given by the transport device 18, a device 24 for examining documents of value arranged in front of the switch 20, and after the switch 20 a first output compartment 26 for documents of value recognized as genuine and a second output compartment 28 for documents of value recognized as not genuine recognized documents of value.
  • a central control and evaluation device 30 is connected at least to the examination device 24 and the switch 20 via signal connections and is used to control the examination device 24, the Evaluation of test signals from the examination device 24 and for controlling at least the switch 20 depending on the result of the evaluation of the test signals.
  • the examination device 24 in connection with the control and evaluation device 30 serves to detect optical properties of the documents of value 12 and to form test signals reflecting these properties.
  • the examination devices 24 While a document of value 12 is being transported past at a specified transport speed in a transport direction T specified by the transport path 22, the examination devices 24 detect optical property values of the document of value, with the corresponding test signals being formed.
  • the central control and evaluation device 30 uses a test signal evaluation to determine whether or not the document of value is recognized as authentic according to a predetermined authenticity criterion for the test signals.
  • the central control and evaluation device 30 has a processor 32 and a memory 34 connected to the processor 32, in which at least one computer program with program code is stored, and when the processor 32 controls the device or evaluates the test signals and controls the transport device 18 according to the evaluation.
  • the central control and evaluation device 30, more precisely the processor 32 therein can check an authenticity criterion which, for example, includes reference data for a document of value to be regarded as genuine, which data are specified and stored in the memory 34.
  • the central control and evaluation device 30, in particular the processor 32 therein controls the transport device 18, more precisely the switch 20, in such a way that the document of value 12, according to its determined authenticity, is deposited in the first output compartment 26 for documents of value recognized as genuine or into the second storage compartment 28 for documents of value recognized as not genuine.
  • the examination device 24 is in 2 shown in more detail. It comprises an illumination device 36 for illuminating at least part of a flat detection area 38 in the transport path 22, into which documents of value 12 to be examined arrive via the transport path 22, and a detection device 40.
  • a control device 42 for controlling the illumination device 36 and an evaluation device 44 for evaluation of signals from detection device 40 are combined in a programmed data processing device 46, which in this example has a processor (not shown) and a memory (not shown) in which a program that can be executed by the processor for controlling lighting device 36 and for evaluating the signals from detection device 40 is stored , includes.
  • the control and evaluation device 42 and 44 are connected to the central control and evaluation device 30 via a signal connection.
  • the lighting device 36 has a semiconductor component or a semiconductor chip 48, in which a matrix-shaped arrangement of at least 50 surface-emitting laser diodes 50 for emitting optical Radiation are formed in a given spectral range (cf. 7 ), and illumination optics 52.
  • the latter has beam-focusing optics 54 along an illumination beam path, a deflection element 56 for deflecting the optical radiation emerging from the beam-focusing optics into the detection area 38, and focusing optics 58 for focusing the deflected illumination radiation as an illumination pattern 60 onto an illumination field 62 in the detection area 38.
  • the spectral range is given by the type of value documents to be examined, more precisely security features formed on them.
  • luminescence properties of the documents of value are to be examined.
  • the spectral range is selected in such a way that the excitation radiation for luminescence of a genuine document of value lies within the spectral range.
  • the deflection element 56 deflects the excitation radiation, but is transparent to a good approximation for the luminescence radiation, so that it can pass through the deflection element 56 without deflection.
  • Optical radiation i.e. detection radiation
  • emanating from the detection region 38 or from a value document 12 therein is imaged to infinity by the focusing optics 58 and passes through the deflection element 56 without deflection into the detection device 40, which in the example has a detection optics 64, a detection optics by means of the detection optics 64 illuminated spectrographic device 66, for example an imaging optical grating, and detection elements 68 for detecting the intensity of generated by the spectrographic device 66 spatially separated spectral components of the detection radiation.
  • the detection elements 68 are for transmitting detection signals, which reflect the intensity of the spectral components impinging on them, to the evaluation device 44 connected to this via signal connections.
  • the detection device 40 therefore does not detect the detection radiation in a spatially resolved manner, so that there is an integral detection of the detection radiation.
  • the surface-emitting laser diodes 50 are arranged in parallel rows and columns running orthogonally to the rows in the semiconductor component 48 of the illumination device 36, the distance between next-neighboring laser diodes being 110 ⁇ m directly in front of the respective laser diode.
  • a schematic top view of a semiconductor component 70 with an edge emitting laser diode is shown.
  • a resonator 72 is formed parallel to the surface of the semiconductor component 70 or the wafer for the production of the semiconductor component, which is partially reflective at its edges 74 and 74' along a low-index lattice plane for the laser radiation to be generated and in which the laser active zone, ie a pn junction, the laser diode is located.
  • the decoupled laser radiation is, as in 3 indicated, orthogonal to edges 74 and 74' and parallel to the surface.
  • the beam profile ie the intensity distribution across a plane perpendicular to the beam direction, is in 4 shown schematically as a contour plot where x and y are in-plane Cartesian coordinates and the lines represent lines of equal intensity.
  • a saddle shape of the distribution can be clearly seen, which is therefore not rotationally symmetrical.
  • a surface-emitting laser diode 76 is shown schematically, in which a resonator 80 is arranged on a substrate 78, the is given by reflection structures or reflection layer structures 84, 84' running parallel to the substrate 78 and the wafer surface 82, for example in the form of interference layers.
  • the laser radiation is now emitted orthogonally to the surface 82 of the wafer or the substrate 78 .
  • the electrodes and the distribution of the current-carrying layers are not shown explicitly.
  • In 6 is in one 4 corresponding representation shown the beam profile of the laser beam emitted by the surface emitting laser diode. To a good approximation, it is rotationally symmetrical about the beam direction and is therefore very well suited for further beam shaping with simple illumination optics with spherical and planar optical elements, as in this exemplary embodiment.
  • the surface-emitting laser diodes 50 are formed and contacted in the semiconductor component 48 in such a way that they can be controlled individually and independently of one another.
  • the number, arrangement and area of the surface-emitting semiconductor diodes 50 and the illumination optics 52 are selected such that a coherent, planar illumination field with a surface area of at least 0.5 mm 2 is homogeneous in the detection region 38, i.e. with an intensity fluctuation based on the maximum intensity in the illumination area less than 20% can be illuminated.
  • the control device 42 is used for the separate activation of the laser diodes 50.
  • the examination device 24 is designed as a module for installation in a value-document processing device, which is constructed in such a way that, in principle, the documents of value 12 can be fed to it from opposite directions.
  • the control device 42 controls the laser diodes 50 in such a way that an illumination field 62 or an illumination pattern 60 is generated in the detection region 38, which spreads further across in the opposite direction to the transport direction T a detection field 86 (cf. 8 ) extends beyond than in the transport direction T.
  • the detection field 86 is defined in that, apart from scattered radiation, only optical radiation from the detection field 86 can reach the detection device 40 . What is thereby achieved is that an area on the document of value is exposed to the illumination or excitation radiation for a time which is longer than the time in which it lies in the detection field 86 . As a result, increased luminescence radiation can be achieved, which facilitates the detection of the luminescence.
  • the control device 42 is set up, here by appropriate programming, in such a way that, in response to a signal from the central control and evaluation device 30, which reflects the transport direction T in relation to the position of the examination device 24, it controls the laser diodes 50 in such a way that, depending on the transport direction T or the signal reflecting this of one of the two in 8 illustrated illumination pattern 60 or 61 is generated by the laser beams 88 in the detection area 38 . These are shifted relative to the chip 48 so that the effect described above occurs. For this purpose, only part of the laser diodes 50 is switched on, namely those in 8 left (a)) or right (b)) laser diodes, the others remain switched off. For the sake of clarity, the illumination optics 52 and their influence on the beam path are not shown in the figure. "Switched on” is understood to mean that these are operated either continuously or in a pulsed manner.
  • Another value document processing device in 9 differs from the first exemplary embodiment in that an image sensor 90 is now arranged along the transport path 22 upstream of an inspection device 24', which is used to capture images of value documents supplied and transmits the images via an image signal connection to a central control and evaluation device 30'. All other components are unchanged, so that the same reference numerals are used for these as in the first exemplary embodiment and the explanations for the first exemplary embodiment also apply here accordingly.
  • the central control and evaluation device 30' differs from the central control and evaluation device 30 in that it has an in 9 has an interface (not shown) for capturing the image data of the image sensor 90 and is designed, in the example by a corresponding program module, to determine from the image data the position of an area of the document of value to be examined more closely with the optical examination device 24', for example a specific feature area and output to the inspection device 24'.
  • the image sensor 90 therefore represents a position detection device in conjunction with the central control and evaluation device 30'.
  • the examination device 24 ′ differs from the examination device 24 of the first exemplary embodiment solely in that the control device is now different from the control device 42 . More precisely, the control device is designed to drive the laser diodes 50 differently than the control device 42. As in FIG 10 in a time sequence a), b), c) schematically in one 8 shown in a corresponding manner, the control device controls the laser diodes 50 in such a way that in the transport direction T progressively in the transport direction, front laser diodes 92 are switched on and rear laser diodes 94 are switched off in the transport direction.
  • the image sensor 90 can also be replaced by other devices by means of which the position of specific features to be examined can be identified.
  • a signal from an edge detector for detecting a leading edge of the document of value in the transport direction for example a light barrier or an ultrasonic sensor, can be used in conjunction with the known transport speed and the known position of the feature on the document of value to determine a suitable to generate a position signal.
  • a further value-document processing device differs from the first embodiment in that the value-document is now completely stopped for examining a value-document and, after stopping in the detection area, a start signal is sent to an examining device 24" is delivered, for which purpose the central control and evaluation device 30 is modified accordingly.
  • the examination device 24" distinguishes differs from the examination device 24 of the first exemplary embodiment solely by the design or programming of the control and evaluation device 42 or 44. The same reference symbols are therefore used for all other components as in the first exemplary embodiment and the explanations relating to these also apply here accordingly .
  • the control device is designed to control the laser diodes 50 in such a way that they produce an illumination pattern that changes over time during the illumination. More precisely, the laser diodes are controlled in such a way that the same illumination pattern 60" is moved over the document of value 12 at a constant speed in the example, as is shown in FIG 10 in the representation corresponding 11 in a time sequence a), b), c) is illustrated.
  • the reflected detection radiation is recorded by the detection device 40 and the evaluation device 44 at constant time intervals, with pulsed activation of the laser diodes, synchronously with the pulses, and stored in the evaluation device 44 according to the chronological order and thus the location on the document of value or sent directly to the transfer central control and evaluation.
  • an image of the document of value is obtained.
  • the corresponding image data possibly after intermediate storage in the evaluation device, are transmitted to the central control and evaluation device 30 and further evaluated there.
  • the illumination pattern 60" is included, as in 11 illustrated, rectangular slit-shaped.
  • the illumination pattern 60" is preferably so narrow that it can serve as a "virtual" entrance slit for the detection device or the spectrographic device, which then no longer needs to have an entrance slit.
  • Such an examination device can also be used advantageously for recognizing barcodes.
  • the detection device then needs to have only one detection element, but no spectrographic device.
  • a row of detection elements can be provided in the detection device, by means of which areas in the detection or detection area can be detected with spatial resolution along a row transverse to the direction of movement of the illumination pattern.
  • Such an examination device can in particular also be used to record two-dimensional barcodes.
  • the examination device differs from the examination device of the first exemplary embodiment by having a different detection device 40′′′ and a different control and evaluation device.
  • the detection device 40′′′ (cf. 12
  • the Detection elements 102 can have different sensitivities for optical radiation in the same spectral range, for example due to fluctuations in production or due to different aging.
  • the control device 42 is modified in relation to the control device 42, ie it is designed in such a way that it controls the laser diodes 50 in accordance with the Sensitivity of the detection elements 102 controls so that the differences in sensitivity are compensated. More precisely, this means that the laser diodes 50 are driven in such a way that all detection elements 102 emit the same detection signals.
  • the evaluation device 44" is designed to acquire the detection signals of the detection elements 102.
  • control device is designed to detect the detection signals of the detection elements for a given activation of the laser diodes by means of the evaluation device and to automatically change the activation of the laser diodes so that all detection elements emit the same detection signal.
  • this corresponds to a calibration of the examination device.
  • this process can be carried out automatically at predetermined intervals during the operating time of the examination device or each time the examination device is switched on or off, for which the control device can be designed accordingly, for example by appropriate programming.
  • Yet another exemplary embodiment differs from the first exemplary embodiment only in that the surface-emitting laser diodes 50 are formed and contacted in the semiconductor component in such a way that they can be controlled separately or independently of one another in at least two groups, in this exemplary embodiment line by line.
  • the control device 42 is modified in such a way that the groups, ie the rows here, are driven individually separately from one another, whereby the same illumination pattern as in the first exemplary embodiment can be obtained.
  • FIG. 13 the surface-emitting laser diodes 50 are now (cf. 13 ) are arranged on the lattice points of a hexagonal point lattice with a distance between nearest neighbors of less than 120 ⁇ m, in the example 100 ⁇ m, which means that an even greater homogeneity of the illumination pattern can be achieved.
  • the lighting device does not have the deflection element 56, so that a rectilinear lighting beam path is achieved.
  • the detection device is designed and arranged for the detection of optical radiation after transmission through the document of value. It has its own optics, which have the same properties as the focusing optics, for imaging at least one section of the document of value from the side not illuminated by the illumination device.
  • the document of value can also be illuminated at angles deviating from 90°, in which case the detection device may then be designed and arranged accordingly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Radiation-Therapy Devices (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Claims (21)

  1. Dispositif d'examen optique d'au moins un document de valeur (12) transporté individuellement dans une direction de transport prédéterminée et à une vitesse de transport prédéterminée dans une zone de saisie (38) du dispositif, comprenant
    un équipement d'éclairage (36) pour l'éclairage du document de valeur (12) dans au moins une partie de la zone de saisie (38), lequel possède au moins une diode laser (50; 76),
    un équipement de commande (42) pour la commande de la diode laser (50; 76),
    et
    un équipement de détection (40; 40‴) pour la saisie de rayonnement optique émanant d'au moins une partie de la zone de saisie (38),
    caractérisé en ce
    que la au moins une diode laser (50; 76) est une diode laser à émission par la surface et l'équipement d'éclairage (36), pour la génération d'une conformation prédéterminée d'éclairage, possède dans la zone de saisie au moins une autre diode laser (50; 76) à émission verticale par la surface,
    que l'équipement de commande (42) est conçu aussi pour la commande de l'autre diode laser (50; 76), et
    que l'équipement d'éclairage (36) comporte au moins deux groupes de diodes laser (50; 76) à émission par la surface qui comprennent les diodes laser (50; 76), dans lequel les diodes laser (50; 76) respectivement d'un groupe peuvent être commandées indépendamment de celles de l'autre groupe,
    et l'équipement de commande (42) est conçu pour la commande du un groupe de diodes laser (50; 76) séparément de la commande de l'autre groupe de diodes laser (50; 76), et que les diodes laser (50; 76) sont réalisées dans une même puce (48) et sont agencées en matrice sur les points de grille d'une grille rectangulaire ou carrée ou sur les points d'une grille de points hexagonale, et
    qu'une étendue d'une zone de détection de l'équipement de détection (40; 40‴) dans la direction de transport est inférieure à l'étendue de la conformation d'éclairage dans la direction de transport, et que la conformation d'éclairage, vue dans la direction opposée à celle du transport, s'étend, par rapport à la zone de détection, plus loin qu'en direction du transport.
  2. Dispositif selon la revendication 1, dans lequel les diodes laser (50; 76) peuvent être commandées individuellement et l'équipement de commande (42) est conçu pour commander individuellement les diodes laser (50; 76).
  3. Dispositif selon une des revendications précédentes, lequel est conçu pour éclairer une surface prédéterminée avec une conformation d'éclairage (60) dont la variation d'intensité dépendante de la localisation sur la surface éclairée par les diodes laser (50; 76) est inférieure à 20 % de l'intensité maximale de la conformation d'éclairage (60).
  4. Dispositif selon la revendication 3, dans lequel la surface prédéterminée (62) possède un contenu supérieur à 0,5 mm2.
  5. Dispositif selon une des revendications précédentes, dans lequel l'équipement de commande (42) est conçu pour, en fonction d'un signal ou de données mémorisées dans l'équipement de commande (42), commander de telle façon les diodes laser (50; 76) que, en fonction du signal ou des données, la même conformation d'éclairage (60) peut être générée à différentes localisations prédéterminées dans la zone de saisie (38).
  6. Dispositif selon une des revendications précédentes, dans lequel l'équipement de commande (42) est conçu pour commander de telle façon les diodes laser (50; 76) que, dans la zone de saisie (38), une conformation d'éclairage (60) changeant avec le temps pendant l'éclairage est générée.
  7. Dispositif selon une des revendications précédentes, dans lequel l'équipement de commande (42) est conçu pour commander de telle façon les diodes laser (50; 76) qu'une conformation prédéterminée d'éclairage (60) est déplacée dans une direction prédéterminée à une vitesse prédéterminée.
  8. Dispositif selon une des revendications précédentes, lequel est conçu pour générer un conformation d'éclairage (60) rectangulaire, en particulier linéaire.
  9. Dispositif selon une des revendications précédentes, dans lequel l'équipement de détection (40) détecte intégralement du rayonnement optique provenant de la zone de saisie (38), ou dans lequel l'équipement de détection (40‴) est conçu pour la saisie à résolution locale de rayonnement optique dans au moins une plage spectrale prédéterminée, et dans lequel l'équipement de commande (42) est conçu pour commander de telle façon les diodes laser (50; 76) qu'une variation d'une sensibilité de l'équipement de détection (40"') au rayonnement optique dans la plage spectrale est compensée au moins partiellement en fonction de la localisation.
  10. Dispositif selon une des revendications précédentes, dans lequel l'équipement de commande (42) est conçu pour, en fonction de signaux de localisation d'un équipement de détection de localisation (30', 90), générer une conformation d'éclairage (60) dans une partie prédéterminée de la zone de saisie (38).
  11. Dispositif de traitement de documents de valeur (12) ayant un dispositif d'examen (24) selon une des revendications précédentes et un équipement de transport (18) pour le déplacement d'un document de valeur (12) déliassé à travers la zone de saisie (38), à la vitesse prédéterminée.
  12. Dispositif selon la revendication 11, dans lequel l'équipement de transport (18) est conçu pour le déplacement d'un document de valeur (12) déliassé à travers la zone de saisie (38), et dans lequel l'équipement de commande (42) est conçu pour commander de telle façon les diodes laser (50; 76) que la conformation d'éclairage (60) est déplacée en direction du transport à la vitesse de transport.
  13. Procédé d'examen (24) optique d'un document de valeur (12) transporté individuellement dans une direction de transport prédéterminée et à une vitesse de transport prédéterminée dans une zone de saisie (38), dans lequel le document de valeur (12) est éclairé avec au moins une diode laser (50; 76) à émission verticale par la surface,
    caractérisé en ce
    que la au moins une diode laser (50; 76) est une diode laser (50; 76) à émission verticale par la surface et que le document de valeur est éclairé avec d'autres diodes laser (50; 76) à émission verticale par la surface, et
    que le document de valeur (12) est éclairé avec au moins deux groupes de diodes laser (50; 76) à émission verticale par la surface qui contiennent les diodes laser (50; 76), cependant que les diodes laser (50; 76) du un groupe sont commandées séparément de celles de l'autre groupe,
    que les diodes laser sont réalisées dans une même puce et sont agencées en matrice sur les points de grille d'une grille rectangulaire ou carrée ou sur les points d'une grille de points hexagonale, et qu'une étendue d'une zone de détection d'un équipement de détection (40; 40‴) pour la saisie de rayonnement optique provenant d'au moins une partie de la zone de saisie (38), dans la direction de transport, est inférieure à l'étendue de la conformation d'éclairage dans la direction de transport, et que la conformation d'éclairage, vue dans la direction opposée à celle du transport, s'étend, par rapport à la zone de détection, plus loin qu'en direction du transport.
  14. Procédé selon la revendication 13, dans lequel les diodes laser (50; 76) sont commandées individuellement.
  15. Procédé selon une des revendications 13 ou 14, dans lequel les diodes laser (50; 76) sont commandées de telle façon que, avec les diodes laser (50; 76), une surface prédéterminée du document de valeur est éclairée avec une conformation d'éclairage (60; 61) dont la variation d'intensité dépendante de la localisation sur la surface est inférieure à 20 % de l'intensité maximale de la conformation d'éclairage (60).
  16. Procédé selon une des revendications de 13 à 15, dans lequel les diodes laser (50; 76) sont commandées de telle façon en fonction d'un signal ou de données que, en fonction du signal ou des données, la même conformation d'éclairage (60; 61) peut être générée à une des au moins deux différentes localisations.
  17. Procédé selon une des revendications de 13 à 15, dans lequel les diodes laser (50; 76) sont commandées de telle façon qu'une conformation d'éclairage (60') changeant avec le temps pendant l'éclairage est générée.
  18. Procédé selon une des revendications de 13 à 17, dans lequel les diodes laser (50; 76) sont commandées de telle façon qu'une conformation prédéterminée d'éclairage (60') est déplacée dans une direction prédéterminée à une vitesse prédéterminée.
  19. Procédé selon la revendication 18, dans lequel le document de valeur (12) est déplacé de manière déliassée pendant l'éclairage (60; 61) dans la direction de transport prédéterminée et à la vitesse de transport prédéterminée, et dans lequel, de préférence, la direction est la direction de transport et la vitesse est la vitesse de transport.
  20. Procédé selon une des revendications de 13 à 19, dans lequel les diodes laser (50; 76) sont commandées de telle façon qu'une variation d'une sensibilité d'un équipement de détection (40‴) destiné à la saisie à résolution locale de rayonnement optique dans au moins une plage spectrale prédéterminée est compensée au moins partiellement en fonction de la localisation.
  21. Procédé selon une des revendications de 13 à 20, dans lequel les diodes laser (50; 76) sont commandées de telle façon que, en fonction de signaux de localisation d'un équipement de détection de localisation (30', 90), une conformation d'éclairage (60) est générée dans une partie prédéterminée de la zone de saisie (38).
EP12001199.4A 2006-09-27 2007-09-26 Dispositif et procédé destinés à l'examen optique de documents de valeur Active EP2490185B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006045626A DE102006045626A1 (de) 2006-09-27 2006-09-27 Vorrichtung und Verfahren zur optischen Untersuchung von Wertdokumenten
EP07818466A EP2070058A1 (fr) 2006-09-27 2007-09-26 Procédé et dispositif d'examen optique de documents de valeur
PCT/EP2007/008383 WO2008037457A1 (fr) 2006-09-27 2007-09-26 Procédé et dispositif d'examen optique de documents de valeur

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EP2070058A1 (fr) 2009-06-17
CN101542543B (zh) 2015-03-18
DE102006045626A1 (de) 2008-04-03
CA2664416A1 (fr) 2008-04-03
TWI365425B (en) 2012-06-01
IL197848A0 (en) 2009-12-24
AU2007302243B2 (en) 2013-09-05
ES2913454T3 (es) 2022-06-02
RU2009115781A (ru) 2010-11-10
US8115910B2 (en) 2012-02-14
CA2664416C (fr) 2015-06-23
IL197848A (en) 2014-11-30
TW200836132A (en) 2008-09-01
CN101542543A (zh) 2009-09-23
EP2490185A3 (fr) 2012-10-31
UA94767C2 (ru) 2011-06-10
US20100060880A1 (en) 2010-03-11
EP2490185A2 (fr) 2012-08-22
RU2421817C2 (ru) 2011-06-20
WO2008037457A1 (fr) 2008-04-03
AU2007302243A1 (en) 2008-04-03
HK1136378A1 (en) 2010-06-25

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