EP2070058A1 - Vorrichtung und verfahren zur optischen untersuchung von wertdocumenten - Google Patents
Vorrichtung und verfahren zur optischen untersuchung von wertdocumentenInfo
- Publication number
- EP2070058A1 EP2070058A1 EP07818466A EP07818466A EP2070058A1 EP 2070058 A1 EP2070058 A1 EP 2070058A1 EP 07818466 A EP07818466 A EP 07818466A EP 07818466 A EP07818466 A EP 07818466A EP 2070058 A1 EP2070058 A1 EP 2070058A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser diodes
- predetermined
- detection
- illumination
- illumination pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- 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 an apparatus and a method for the optical examination of value documents.
- value documents are meant card or in particular sheet-shaped objects which, for example, represent a monetary value or an authorization and / or should not be able to be produced arbitrarily by unauthorized persons. They therefore have features which are not easy to manufacture, in particular to be copied, whose presence is an indication of the authenticity, i. the manufacture by an authorized agency. Important examples of such value documents are chip cards, coupons, vouchers, checks and in particular banknotes.
- Value documents are often optically examined for the purpose of recognizing their type and / or condition and / or checking for authenticity.
- the ambient light could be used for the examination, but such investigations are subject to excessive errors due to the fluctuations in the properties of the ambient light.
- devices are used for the examination which comprise a lighting device for illuminating at least a part of a section of a value document with optical radiation of predetermined properties given by a detection area of the device and a detection device for detecting optical radiation coming from the detection area, in particular one of the Lighting device lit value document, comes owns.
- light sources such as halogen lamps can be used for illumination, they consume a lot of power compared to the radiation power emitted in a desired spectral range and therefore require adequate cooling.
- they have the disadvantage that they do not have a very long service life.
- these light sources have a significant amount of space.
- the present invention is therefore an object of the invention to provide a device for the optical examination of documents of value, which allows a good lighting of a value document to be examined in a compact design, and to provide a corresponding method.
- the object is achieved by a device for optically examining at least one value document in a detection range of the device, having an illumination device for illuminating the value document in at least a part of the detection region which has at least one surface emitting laser diode, a control device for driving the laser diode, and a detection device for detecting optical radiation from at least part of the detection area.
- the object is further achieved by a method for the optical examination of a value document in a detection area, in which the value document is illuminated with at least one surface-emitting laser diode.
- optical radiation from at least a part of the detection area which occurs by illuminating the value document.
- This can be, in particular, luminescence radiation excited in the value document, from the value document act back or passed through this optical radiation.
- the detection device can accordingly be arranged relative to the illumination device and the detection region, in particular such that their radiation entry is on the same side of the document of value from which it is illuminated, or on the opposite side. This means that the detection device can be arranged so that an examination with reflected or transmitted light or in reflection or transmission is possible.
- the examination can be carried out if the document of value rests 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 value documents, also referred to below as a value-document processing device, with an inspection device according to the invention and a transport device for moving a value document through the capture region at a predetermined transport speed.
- the transport speed can be predetermined in particular depending on the properties of the examination device or the transport device. In a sequential detection, an image of the portion of the value document moved through the detection area can thus be obtained.
- the invention is completely different from the conventional types of lighting. So it is conceivable, for lighting instead of halogen lamps Conventional edge-emitting laser diodes (so-called “edge emitting laser diodes”) to use, but radiate this optical radiation with a very inhomogeneous and not simply symmetrical intensity distribution. This may affect the examination of the value document.
- a surface emitting laser diode is used for illumination.
- a surface-emitting laser diode is more particularly understood to mean a vertically surface-emitting laser diode or, in particular, a semiconductor component referred to as a vertical cavity surface-emitting laser (VCSEL) whose laser resonator has its outcoupling direction in the radiation
- VCSEL vertical cavity surface-emitting laser
- the laser resonator of such surface-emitting laser diodes can be oriented at least approximately orthogonally to the surface of the component or chip
- these can be made 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 rotational profile which is rotationally symmetrical to a good approximation, whereby a beam fermination with simple optical elements compared to edge emitting laser diodes is much easier.
- the emission wavelength range is determined more strongly by the laser resonator than in the case of edge-emitting laser diodes. This allows narrower emission wavelength ranges and leads to a higher thermal stability of the emission wavelength range.
- the half-width (FWHM) of the emission spectrum is less than 1 nm.
- the spatial coherence of the emitted radiation is also lower than with edge-emitting laser diodes, so that speckle patterns can largely or completely be avoided on a value document illuminated by the laser diode.
- the illumination device for generating a predetermined illumination pattern in the detection area has at least one further surface emitting laser diode and the control device is designed to control the further laser diode.
- the laser diodes are formed in a device or chip.
- Such training is only available 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 is the fact that only one component needs to be handled as a radiation source during assembly of the examination device, which considerably simplifies the production.
- more than 50 laser diodes are arranged on a component.
- control of the laser diodes by means of the control device can be done in different ways.
- all the laser diodes of the illumination device are driven together, so that the illumination pattern available in the detection range is essentially determined by the number and arrangement of the laser diodes.
- the illumination device has at least two groups of surface-emitting laser diodes which comprise the aforementioned surface-emitting laser diodes, and the laser diodes of one group can be controlled independently of the other group.
- the control device is designed to control the one group of laser diodes separately from the control of the other groups of laser diodes.
- the document of value may then be illuminated with at least two groups of surface emitting laser diodes containing the laser diode, the laser diodes of one group being driven separately from those of the other group.
- 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.
- control device must be able to control the groups independently, wherein, of course, for example by programming the control device, a coupling of the control of the two groups of laser diodes can be done.
- the laser diodes can be controlled individually in the examination device and the control device is designed to control the laser diodes individually. If further surface-emitting laser diodes are used in the method for illuminating the value document, the laser diodes can then be controlled individually. In particular, the control can take place independently or separately in the above-mentioned sense. The possibility of individual control of laser diodes on a chip is another advantage of surface-emitting laser diodes.
- the illumination pattern can be largely determined in its shape, if only a simple illumination optics, i.
- an illumination optical system with at least approximately one, optionally folded by deflecting optical axis in the beam path rotationally symmetrical optical components such as lenses, is used.
- the use of only such an illumination optics simplifies and reduces the cost of manufacturing the illumination device.
- An illumination device with a plurality of surface emitting laser diodes can advantageously be used to generate a planar 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 so that the laser diodes a predetermined area of the document of value is illuminated with a lighting 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 has a content greater than 0.5 mm 2 .
- this homogeneity can be achieved by using suitable optical components or homogyesizing 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 generated therewith has a location-dependent intensity variation across the area less than 20% of the maximum intensity of the illumination pattern.
- the examination device particularly preferably has no homogenization elements such as, for example, scattering discs, light guides or microlens arrangements for homogenization.
- the center distance of next adjacent surface emitting laser diodes of the illumination device is for this purpose preferably less than 150 microns
- the laser diodes can be arranged in matrix form in the examination device.
- they can be 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 designed simply in the case of a single controllability of the laser diodes. In addition, can be done with this arrangement a particularly simple control.
- the laser diodes are arranged on the points of a hexagonal point grid. This arrangement has the advantage that achieved in a simple manner, a particularly dense arrangement of the laser diodes and thus a particularly homogeneous illumination pattern is made possible.
- the illumination pattern in the detection area or on the value document, at least in its shape, can essentially be determined by the arrangement of the emitting laser diodes.
- the control device is preferably designed to control only a part of the laser diodes for emitting optical radiation in each case in order to generate a predetermined illumination pattern.
- the laser diodes are driven to emit optical radiation, so that a predetermined illumination pattern is generated.
- This embodiment has the advantage that, depending on the design, a change in the illumination pattern may occur. sters only a change of the control device is necessary. If this is programmable, which is preferred, even only the program needs to be changed.
- the control device is designed to control the laser diodes in dependence on a signal or data stored in the control device in such a way that the same depends on the signal or the data in the detection region Lighting pattern can be generated at different predetermined locations.
- the laser diodes can then be driven in response to a signal or data such that, depending on the signal or data, the same illumination pattern can be generated at one of at least two different locations.
- the signal can be read in, for example, via an interface from an external data input device or transmitted by a device of the value-document processing device containing the examination device.
- the control of the laser diodes may in particular consist in that only a part of the laser diodes is switched on or off.
- the surface emitting laser diodes so drive that an extension of a detection range 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 seen in the transport direction with respect to the detection range extends further than against the transport direction.
- the detection area is understood to be the portion of the detection area from which, in particular, except for scattered radiation alone, the detection unit is used.
- direction can receive optical radiation for detection.
- a signal or data on the transport direction can be made available to the control device in the ways indicated above, which carries out the control of the laser diodes in dependence on the signal or the data. This can be achieved at the same time two things.
- 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 corresponding signals for example from a drive of the transport device or another device of the valuable document processing device transmitted to the controller or manually entered via an interface.
- the examination device can therefore be designed and used as an easily configurable module.
- the drive can be switched between two or more lighting pattern layers in particular.
- the control device may be designed to control the laser diodes so that an illumination pattern which changes over time during the illumination is generated in the detection region. In the process it is then it is preferred that the laser diodes are driven to produce a lighting pattern that changes with time during illumination.
- the temporal change may be predetermined in particular, for example by a corresponding training 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 so that a predetermined illumination pattern is moved in a given direction at a predetermined speed.
- the control device is then designed to control the laser diodes so that a predetermined illumination pattern is moved in a predetermined direction at a predetermined speed. In this case, the movement only has to take place for a predefined period of time, for example, until the detection area has once been passed over by the illumination pattern.
- 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, in particular, to sequentially capture a one- or two-dimensional image.
- the detection means need only be formed so as to detect optical radiation coming from the detection area integrally or only one-dimensionally in a direction transverse to the moving direction of the illumination pattern.
- An integral detection is understood to mean a detection which is not spatially resolving at a given time.
- the examination device can be designed, in particular, to generate a rectangular, in particular line-shaped illumination pattern.
- the examination device can be used in particular for detecting one-dimensional or two-dimensional barcodes by moving the illumination pattern.
- the value document can rest on acquisition.
- the value document is moved during illumination in a predetermined transport direction and at a predetermined transport speed.
- the speed of movement of the illumination pattern may differ in principle from the transport speed.
- the value document is 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 value documents is then the Transport means for moving a value document formed by the detection area with a predetermined transport speed, and the control means is adapted to drive the laser diodes so that the illumination pattern is moved at the transport speed in the transport direction.
- the control device is adapted to generate a lighting pattern in a predetermined part of the detection range in response to position signals of a position detection device.
- the laser diodes are driven in such a way that a lighting pattern is generated in a predetermined part of the detection area as a function of position signals of a position detection device.
- the amount of data accumulating during an examination of the entire value document 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 the spatially resolved detection of optical radiation is formed in at least one predetermined spectral range, a significant data reduction and an increase in the data processing speed can be achieved in pursuit of the feature.
- the detection device may comprise the detection device for spatially resolved detection of optical radiation in at least one predetermined spectral range and the control device may be designed to control the laser diodes such that a variation of a 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 so that a variation of a 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 time, a local adjustment of the illuminance to the sensitivity of the detection device, so that a permanent optical examination is possible permanently.
- the laser diodes can be operated as continuously lit or pulsed radiation sources, for which purpose the control device is accordingly designed.
- FIG. 1 is a schematic representation of a value-document processing device according to a first preferred embodiment
- FIG. 2 shows a schematic representation of an examination device of the value-document processing device in FIG. 1, FIG.
- FIG. 3 shows a schematic plan view of an edge-emitting laser diode
- FIG. 4 shows a schematic representation of a beam profile of the edge-emitting laser diode in FIG. 3 in the form of a contour diagram
- FIG. 5 is a schematic side sectional view of a surface emitting laser diode
- FIG. 6 shows a schematic illustration of a beam profile of the surface-emitting laser diode in FIG. 5 in the form of a contour diagram
- FIG. 7 shows a schematic plan view of a chip of the examination device in FIG. 2 with a matrix-like arrangement of surface-emitting laser diodes
- FIG. 8 is a side view and a plan view of two possible illumination by driving the laser diodes in Fig. 7,
- FIG. 9 is a schematic representation of a value-document processing device according to a second preferred embodiment
- FIG. 10 is a schematic representation of a temporal evolution of a
- the value document is tracked, in a side view and a top view,
- FIG. 11 shows a schematic representation of a temporal development of a lighting of a static value document, in which the illumination pattern is guided over the value document, in a lateral view and a plan view,
- FIG. 12 is a schematic representation of part of a detection device of an examination device according to a further embodiment of the invention.
- FIG. 13 shows a schematic plan view of a chip of the examination device in FIG. 2 with an arrangement of surface-emitting laser diodes on grid points of a hexagonal point grid.
- a central control and evaluation device 30 is connected at least to the examination device 24 and the switch 20 via signal connections and serves to control the examination device 24, the Evaluation of test signals of the examination device 24 and for controlling at least the switch 20 as a function of the result of the evaluation of the test signals.
- the examination device 24 in conjunction with the control and evaluation device 30 serves to detect optical properties of the value documents 12 and to form test signals representing these properties.
- the inspection devices 24 detect optical property values of the value document, wherein the corresponding test signals are formed.
- the central control and evaluation device 30 determines in a test signal evaluation, whether the value document is recognized as true according to a predetermined authenticity criterion for the test signals or not.
- the central control and evaluation device 30 has, in addition to corresponding interfaces for the sensors, a processor 32 and a memory 34 connected to the processor 32 in which at least one computer program with program code is stored, in the execution of which the processor 32 controls or controls the device ., the test signals evaluates and corresponding to the evaluation, the transport device 18 controls.
- the central control and evaluation device 30, more precisely the processor 32 therein, can check an authenticity criterion, for example, for reference data for a value document to be regarded as authentic, which are predetermined and stored in the memory 34.
- the examination device 24 is shown in more detail in FIG. It comprises a lighting device 36 for illuminating at least part of a planar detection area 38 in the transport path 22, into which value documents 12 to be examined via the transport path 22 pass, and a detection device 40.
- a control device 42 for controlling the illumination device 36 and an evaluation device 44 for evaluation of signals of the detection device 40 are combined in a programmed data processing device 46, which in this example a processor, not shown, and a memory, not shown, in which a program executable by the processor for controlling the illumination device 36 and for evaluating the signals of the detection device 40 is stored , includes.
- the control and the evaluation device 42 lbs.44 are connected via a signal connection to the central control and evaluation device 30.
- the illumination device 36 has a semiconductor component or a semiconductor chip 48, in which a matrix-like arrangement of at least 50 surface emitting laser diodes 50 for emitting optical 7) and an illumination optics 52.
- the latter has along a illumination beam path a beam-focusing optics 54, a deflection element 56 for deflecting the optical radiation emerging from the beam-focusing optics into the detection area 38 and a focusing optics 58 to focus the deflected illumination radiation as the 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, or more precisely by the security features that are formed.
- luminescence properties of the value documents are to be investigated.
- the spectral range is chosen such that the excitation radiation for luminescence of a true value document lies within the spectral range.
- the deflection element 56 is deflecting for the excitation radiation, but transparent to the luminescence radiation to a good approximation, so that it can pass through the deflection element 56 without deflection.
- Optical radiation, ie detection radiation, originating therefrom from the detection area 38 or from a value document 12 is imaged infinitely by the focusing optics 58 and passes through the deflecting element 56 without deflection into the detection device 40, which in the example uses detection optics 64 the detection optics 64 illuminated spectrographic device 66, for example, an imaging optical grating, and detection elements 68 for detecting the intensity of spatially separated spectral components of the detection radiation generated by the spectrographic device 66 comprises.
- the detection elements 68 are used to transmit detection signals, which represent the intensity of the spectral components incident on them, to the evaluation unit. direction 44 connected to this via signal connections.
- the detection device 40 therefore does not detect the detection radiation spatially resolved, so that an integral detection of the detection radiation is provided.
- the surface emitting laser diodes 50 are arranged in parallel rows and columns orthogonal to the rows, the spacing of nearest adjacent laser diodes being 110 ⁇ m immediately before the respective laser diode.
- FIG. 3 shows a schematic plan view of a semiconductor component 70 having an edge-emitting laser diode.
- a resonator 72 is formed parallel to the surface of the semiconductor component 70 or the wafer for producing the semiconductor component, which is partially reflective at its edges 74 and 74 'along a low-index grating plane for the laser radiation to be generated in which the laser-active zone, ie a pn junction, the laser diode is located.
- the decoupled laser radiation is emitted, as indicated in Fig. 3, orthogonal to the edges 74 and 74 'and parallel to the surface.
- the beam profile i.
- FIG. 4 the intensity distribution over a plane transverse to the beam direction is shown schematically in FIG. 4 as a contour diagram in which x and y are Cartesian coordinates in the plane and the lines represent lines of equal intensity. It is clear to recognize a saddle shape of the distribution, which is therefore not rotationally symmetric.
- FIG. 5 schematically shows a surface-emitting laser diode 76 in which a resonator 80, which is arranged on a substrate 78, is arranged is provided by parallel to the substrate 78 and the wafer surface 82 extending reflection structures or reflective layer structures 84, 84 ', for example in the form of interference layers.
- the laser radiation is now emitted orthogonally to the surface 82 of the wafer or to the substrate 78.
- the electrodes and the distribution of the current-carrying layers are not explicitly shown.
- FIG. 6 shows in a representation corresponding to FIG. 4 the beam profile of the laser beam emitted by the surface-emitting laser diode. It is, to a good approximation, rotationally symmetrical about the beam direction and is therefore very well suited for further beam shaping with a simple illumination optical unit with spherical and planar optical elements, as in this exemplary embodiment.
- the surface emitting laser diodes 50 are formed in the semiconductor device 48 and contacted so that they are individually controlled independently.
- the number, arrangement and surface of the surface-emitting semiconductor diodes 50 and the illumination optics 52 are selected so that in the detection area 38 a continuous area illumination field with an area of at least 0.5 mm 2 homogeneous, ie with an intensity variation with respect to the maximum intensity in the illumination area is less than 20%, can be illuminated.
- the control device 42 is used for the separate control of the laser diodes 50.
- the examination device 24 is designed as a module for installation in a value-document processing device. sets, which is constructed so that in principle the value documents 12 can be supplied from opposite directions.
- the control device 42 activates the laser diodes 50 in such a way that an illumination field 62 or an illumination pattern 60 is generated in the detection area 38, which is opposite to the transport direction T
- the detection field 86 is defined by the fact that, with the exception of stray radiation, only optical radiation can pass from the detection field 86 into the detection device 40.
- an area on the value document is exposed for a time to the illumination or excitation radiation which is longer than the time in which it lies in the detection field 86.
- an increased luminescence radiation can be achieved, which facilitates the detection of the luminescence.
- the control device 42 here by appropriate programming, is set up in such a way that, in response to a signal from the central control and evaluation device 30, which reproduces the direction of transport T with respect to the position of the examination device 24, it activates the laser diodes 50 so that Depending on the transport direction T or the reproducing this signal of one of the two illumination patterns 60 and 61 shown in Fig. 8 by the laser beams 88 in the detection area 38 is generated. These are shifted relative to the chip 48, so that the above-mentioned effect occurs. For this purpose, only a portion of the laser diodes 50 is turned on, namely the left in Fig. 8 (a)) or right (b)) laser diodes, the other remain switched off. In the figure, for the sake of clarity, the illumination optics 52 or their influence on the beam path is not shown. provides. By “turned on” is understood that they are operated either continuously or pulsed.
- a second exemplary embodiment in FIG. 9 differs from the first exemplary embodiment in that an image sensor 90 is arranged along the transport path 22 upstream of an examination device 24 ', which serves to acquire images of added value documents and to connect the images via an image signal connection to a central control - and evaluation device 30 'transmits. All other components are unchanged, so that the same reference numerals are used for them as in the first embodiment and the explanations to the first embodiment apply accordingly here.
- the central control and evaluation device 30 ' differs from the central control and evaluation device 30 in that it has an interface (not shown in FIG. 9) for capturing the image data of the image sensor 90 and, in the example, by a corresponding program module to determine from the image data the position of an area of the value document to be examined in more detail with the optical examination device 24 ', for example a specific feature area, and output it to the examination 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 embodiment solely in that the control device is now changed relative to the control device 42.
- the control device is more precisely designed to control the laser diodes 50 differently than the control device 42.
- the control device controls the laser diodes 50 so that in succession in each case in the transport direction T progressively in the transport direction front laser diodes 92 on and in the transport direction rear laser diodes 94th be switched off.
- the image sensor 90 may also be replaced by other devices by means of which the position of certain features to be examined can be recognized.
- a signal of an edge detector for detecting a front edge of the document of value for example a light barrier or an ultrasonic sensor, in connection with the known transport speed and the known position of the feature can also be used on the document of value, to generate a suitable position signal.
- Another exemplary embodiment differs from the first exemplary embodiment in that the value document is now completely stopped for examining a value document and a start signal is output to an examination device 24 "after stopping in the detection area, for which purpose the central control and evaluation device 30 is modified accordingly
- the examination device 24 is different itself from the examination device 24 of the first embodiment alone by the training or programming of the control and the evaluation device 42 and 44.
- the same reference numerals are used as in the first embodiment and the explanations to these apply accordingly here ,
- the control device is designed to control the laser diodes 50 such that they generate a lighting pattern that changes over time during the lighting. More precisely, the laser diodes are driven in such a way that the same illumination pattern 60 "is moved over the document of value 12 at a constant speed, as shown in FIG. 10 in FIG. 11 in a time sequence a), b), c).
- the returned detection radiation is detected by the detection device 40 and the evaluation device 44 and according to the time sequence and thus the location on the value document in the evaluation device 44
- the corresponding image data are transmitted, if appropriate after the temporary storage in the evaluation device, in the central control and evaluation device 30 and further evaluated there.
- the illumination pattern 60 is rectangularly slot-shaped, and 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 has no entrance slit needs to show more.
- Such an examination device can also be advantageously used for the detection of barcodes. In this case in particular, the detection device then only needs to have one detection element, but no spectrographic device.
- a row of detection elements may be provided in the detection device, by means of which areas in the detection or detection area can be detected spatially resolved along a line transversely to the movement direction of the illumination pattern.
- Such an examination device can also serve in particular for the detection of two-dimensional barcodes.
- the examination device differs from the examination device of the first exemplary embodiment by another detection device 40 '"and another control and evaluation device.
- the detection device 40 "'(see FIG. 12) now has a field 100 with a two-dimensional arrangement of detection elements 102 for the spatially resolved detection of optical radiation coming from the detection area 38 or the detection area 86 and an imaging optics 104 for focusing the Unlimited beam path after the sierop- tik 58 on the arrangement of detection elements 102.
- the detection elements 102 for example, by fluctuations in the production or by different aging have different sensitivities for optical radiation in the same spectral range.
- the control device 42 is changed in relation to the control device 42 to that end, that is, it is configured to connect the laser diodes 50 in accordance with the Sensitivity of the detection elements 102 so controls that the differences in sensitivity are compensated. More specifically, this means that the laser diodes 50 are driven so that all the detection elements 102 output the same detection signals.
- the evaluation device 44 is designed to detect the detection signals of the detection elements 102.
- control device is designed to detect the detection signals of the detection elements for a given control of the laser diodes by means of the evaluation device, and to automatically change the control of the laser diodes so that all detection elements emit the same detection signal.
- this process can be carried out automatically at given intervals of the operating time of the examination device or whenever the examination device is switched on or off, for which purpose the control device can be designed accordingly, for example by appropriate programming.
- Yet another embodiment differs from the first embodiment only in that the surface emitting laser diodes 50 are formed and contacted in the semiconductor device so that they are separately or independently controllable in at least two groups, in this embodiment, line by line. correspond Accordingly, the control device 42 is modified to control the groups, ie here the rows, individually separated from each other, wherein the same illumination pattern as in the first embodiment can be obtained.
- the illumination device does not have the deflection element 56, so that a rectilinear illumination beam path is achieved.
- the detection device is designed and arranged for the detection of optical radiation after transmission through the value document. It has its own optics corresponding to the focusing optics for imaging at least a portion of the value document from the side not illuminated by the illumination device.
- the illumination of the value document can also take place at angles other than 90 °, in which case the detection device may be designed and arranged accordingly.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12001199.4A EP2490185B1 (de) | 2006-09-27 | 2007-09-26 | Vorrichtung und Verfahren zur optischen Untersuchung von Wertdokumenten |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006045626A DE102006045626A1 (de) | 2006-09-27 | 2006-09-27 | Vorrichtung und Verfahren zur optischen Untersuchung von Wertdokumenten |
PCT/EP2007/008383 WO2008037457A1 (de) | 2006-09-27 | 2007-09-26 | Vorrichtung und verfahren zur optischen untersuchung von wertdocumenten |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12001199.4A Division EP2490185B1 (de) | 2006-09-27 | 2007-09-26 | Vorrichtung und Verfahren zur optischen Untersuchung von Wertdokumenten |
Publications (1)
Publication Number | Publication Date |
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EP2070058A1 true EP2070058A1 (de) | 2009-06-17 |
Family
ID=38984136
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP07818466A Ceased EP2070058A1 (de) | 2006-09-27 | 2007-09-26 | Vorrichtung und verfahren zur optischen untersuchung von wertdocumenten |
EP12001199.4A Active EP2490185B1 (de) | 2006-09-27 | 2007-09-26 | Vorrichtung und Verfahren zur optischen Untersuchung von Wertdokumenten |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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EP12001199.4A Active EP2490185B1 (de) | 2006-09-27 | 2007-09-26 | Vorrichtung und Verfahren zur optischen Untersuchung von Wertdokumenten |
Country Status (13)
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---|---|
US (1) | US8115910B2 (de) |
EP (2) | EP2070058A1 (de) |
CN (1) | CN101542543B (de) |
AU (1) | AU2007302243B2 (de) |
CA (1) | CA2664416C (de) |
DE (1) | DE102006045626A1 (de) |
ES (1) | ES2913454T3 (de) |
HK (1) | HK1136378A1 (de) |
IL (1) | IL197848A (de) |
RU (1) | RU2421817C2 (de) |
TW (1) | TWI365425B (de) |
UA (1) | UA94767C2 (de) |
WO (1) | WO2008037457A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2358882C1 (ru) | 2008-04-18 | 2009-06-20 | Общество С Ограниченной Ответственностью "Новые Энергетические Технологии" | Устройство проверки подлинности документов |
DE102008028690A1 (de) * | 2008-06-17 | 2009-12-24 | Giesecke & Devrient Gmbh | Sensoreinrichtung zur spektral aufgelösten Erfassung von Wertdokumenten und ein diese betreffendes Verfahren |
DE102008028689A1 (de) * | 2008-06-17 | 2009-12-24 | Giesecke & Devrient Gmbh | Sensoreinrichtung zur spektral aufgelösten Erfassung von Wertdokumenten und ein diese betreffendes Verfahren |
DE102010014912A1 (de) * | 2010-04-14 | 2011-10-20 | Giesecke & Devrient Gmbh | Sensor zur Prüfung von Wertdokumenten |
AT514660B1 (de) * | 2013-07-16 | 2021-02-15 | Ait Austrian Inst Tech Gmbh | Verfahren zur Prüfung eines Gegenstands auf Echtheit |
CN103700181A (zh) * | 2013-12-12 | 2014-04-02 | 中国科学院长春光学精密机械与物理研究所 | 基于垂直腔面发射半导体激光器的荧光防伪标识检验装置 |
DE102015105149B4 (de) * | 2015-04-02 | 2018-10-11 | Sick Ag | Optoelektronischer Sensor |
DE102015105150A1 (de) * | 2015-04-02 | 2016-10-06 | Sick Ag | Verfahren zum Betrieb eines optoelektronischen Sensors und optoelektronischer Sensor |
EP3641626A1 (de) | 2017-06-21 | 2020-04-29 | Koninklijke Philips N.V. | Verfahren und kits für den nachweis von karies im frühstadium |
RU2735071C1 (ru) * | 2019-07-29 | 2020-10-27 | Екатерина Олеговна Конкина | Устройство контроля параметров бумаги по её структуре методами гранулометрии с использованием методов лазерной спекл-фотографии при фиксации изображения структуры |
US20220138445A1 (en) * | 2020-11-04 | 2022-05-05 | Verifyme, Inc. | Remote infrared ink reader and authenticator |
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2007
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- 2007-09-26 EP EP07818466A patent/EP2070058A1/de not_active Ceased
- 2007-09-26 EP EP12001199.4A patent/EP2490185B1/de active Active
- 2007-09-26 CA CA2664416A patent/CA2664416C/en active Active
- 2007-09-26 UA UAA200903665A patent/UA94767C2/ru unknown
- 2007-09-26 ES ES12001199T patent/ES2913454T3/es active Active
- 2007-09-26 US US12/443,125 patent/US8115910B2/en active Active
- 2007-09-26 RU RU2009115781/08A patent/RU2421817C2/ru active
- 2007-09-26 WO PCT/EP2007/008383 patent/WO2008037457A1/de active Application Filing
- 2007-09-26 AU AU2007302243A patent/AU2007302243B2/en active Active
- 2007-09-27 TW TW096135960A patent/TWI365425B/zh active
-
2009
- 2009-03-26 IL IL197848A patent/IL197848A/en active IP Right Grant
-
2010
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Also Published As
Publication number | Publication date |
---|---|
HK1136378A1 (en) | 2010-06-25 |
US20100060880A1 (en) | 2010-03-11 |
US8115910B2 (en) | 2012-02-14 |
AU2007302243B2 (en) | 2013-09-05 |
WO2008037457A1 (de) | 2008-04-03 |
AU2007302243A1 (en) | 2008-04-03 |
EP2490185A2 (de) | 2012-08-22 |
CN101542543B (zh) | 2015-03-18 |
UA94767C2 (ru) | 2011-06-10 |
CA2664416A1 (en) | 2008-04-03 |
EP2490185B1 (de) | 2022-04-20 |
ES2913454T3 (es) | 2022-06-02 |
DE102006045626A1 (de) | 2008-04-03 |
EP2490185A3 (de) | 2012-10-31 |
IL197848A (en) | 2014-11-30 |
IL197848A0 (en) | 2009-12-24 |
CA2664416C (en) | 2015-06-23 |
RU2009115781A (ru) | 2010-11-10 |
CN101542543A (zh) | 2009-09-23 |
RU2421817C2 (ru) | 2011-06-20 |
TWI365425B (en) | 2012-06-01 |
TW200836132A (en) | 2008-09-01 |
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