EP2559010B1 - Sensor for verifying value documents - Google Patents
Sensor for verifying value documents Download PDFInfo
- Publication number
- EP2559010B1 EP2559010B1 EP11715177.9A EP11715177A EP2559010B1 EP 2559010 B1 EP2559010 B1 EP 2559010B1 EP 11715177 A EP11715177 A EP 11715177A EP 2559010 B1 EP2559010 B1 EP 2559010B1
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- EP
- European Patent Office
- Prior art keywords
- sensor
- luminescence
- value document
- detectors
- detection region
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- 238000004020 luminiscence type Methods 0.000 claims description 170
- 238000001514 detection method Methods 0.000 claims description 128
- 230000003595 spectral effect Effects 0.000 claims description 36
- 230000005284 excitation Effects 0.000 claims description 26
- 230000035945 sensitivity Effects 0.000 claims description 17
- 238000005286 illumination Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 description 9
- 238000005259 measurement Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000109 continuous material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Classifications
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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
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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
- G07D7/1205—Testing spectral properties
Definitions
- the invention relates to a sensor and a method for checking documents of value and a device which has the sensor.
- sensors are usually used with which the type of documents of value is determined and / or with which the documents of value are checked for authenticity and / or for their condition.
- sensors are used, for example, to check bank notes, checks, ID cards, credit cards, check cards, tickets, vouchers and the like.
- the documents of value are checked in a device for processing documents of value, in which, depending on the properties of the document of value to be checked, one or more different sensors are contained.
- these are usually moved relative to the sensors, either the document of value being transported past the sensor, as it is, for example, from the US2002 / 0191175 A1 is known, or vice versa.
- a value document to be checked can have one or more luminescent substances, of which, for example, the decay time and / or spectral properties of the luminescence are checked, as is evident from, for example, the DE10322794 A1 or EP1814058 A1 is known.
- the luminescent substances of the document of value can be present on the document of value in regions or over the entire surface.
- To check the decay time of the luminescence it is known to illuminate documents of value with light pulses and, in the dark phase between the light pulses, to detect the luminescence intensity of the document of value at different times after the end of the illumination pulse.
- the disadvantage here is that, due to the pulsed lighting and due to the relative movement between the sensor and the document of value, a discontinuous check of the document of value is carried out. This is because the dark phases lead to a periodic interruption of the optical excitation of the document of value, so that the luminescence is not checked at regular intervals along the document of value.
- One object of the present invention is to provide a sensor for checking documents of value with which the decay time of a luminescence of the document of value can be checked in a large value range of decay times even at low movement speeds.
- the sensor according to the invention is designed to check a value document present in a measuring plane of the sensor.
- the value document and the sensor are moved relative to one another in such a way that the value document moves along a direction of movement relative to the sensor.
- the value document is usually transported along or past the stationary sensor along the direction of movement.
- the sensor can also be transported in relation to the stationary value document, or both can be transported.
- the sensor is set up to check the decay time of a luminescence of the document of value. The decay time is checked based on luminescence signals from detectors of the sensor.
- the sensor can only be used for checking documents of value transported individually past the sensor, but also for checking a sheet with several documents of value or a continuous material web which has a multiplicity of documents of value along the direction of movement.
- the sensor is also suitable for checking a web of material made up of documents of value that have not yet been completed in order to check the documents of value as they are being produced.
- the sensor has an illumination device which is used to illuminate a section of the measuring plane of the sensor in order to illuminate the value document, when it moves relative to the sensor, in this section of the measuring plane with excitation light.
- the sensor has several detectors for detecting luminescent light, which the value document illuminated with the excitation light emits in different detection areas of the measuring plane when it moves relative to the sensor.
- the detection areas of the detectors of the sensor are arranged offset from one another along the direction of movement of the document of value.
- the illuminated section and the detection areas of the detectors are each stationary in the measuring plane of the sensor.
- the excitation light of the lighting device is designed to excite a luminescence of the document of value to be checked in such a way that the document of value emits luminescent light which can be detected by the detectors.
- a first of the detectors of the sensor is set up to generate a first luminescence signal of a first detection area which overlaps with the illuminated section in the measuring plane.
- the first luminescence signal corresponds to the luminescent light detected in the first detection area.
- a second of the detectors of the sensor is set up to generate a second luminescence signal of a preceding detection area which, viewed along the direction of movement of the document of value, is arranged in front of the first detection area in the measuring plane.
- the second luminescence signal corresponds to the luminescence light detected in the preceding detection area.
- the illuminated section preferably has a length that is greater than or equal to the length of the first detection region.
- the sensor preferably also has a third detector which is set up to generate a third luminescence signal of a subsequent detection area.
- the subsequent detection area viewed along the direction of movement, is arranged after the first detection area in the measuring plane.
- the third luminescence signal corresponds to the luminescence light detected in the subsequent detection area.
- the third detector enables the sensor to more accurately determine long decay times.
- the sensor can also be implemented without the third detector.
- the subsequent detection area viewed along the direction of movement, is arranged after the first detection area to the extent that it does not overlap with the illuminated section of the measurement plane.
- the illuminated section of the measurement plane is continuously illuminated and the luminescent light of the value document is continuously detected by the detectors at the same time as the illumination.
- the value document can be checked without interruptions, in contrast to a check with pulsed lighting and detection with a time delay.
- a spectral one Arranged filter that blocks the excitation light of the lighting device so that the excitation light scattered on the value document is not also detected.
- the sensor can also have one or more further detectors, each of which is set up to generate a further luminescence signal from a further detection area.
- the further detection area or areas viewed along the direction of movement of the document of value, are arranged after the preceding detection area and in front of the first detection area in the measuring plane.
- the luminescence signals from the other detectors can also be used to check the decay time.
- the ratio of the luminescence signal from one of the further detectors to the first luminescence signal can be formed. It is advantageous to also use the luminescence signal from one of these further detectors to check the decay time, since this enables a more precise check or determination of the decay time.
- the first, the second and optionally the further detectors and optionally the third detector can be formed, for example, by a one- or two-dimensional photodetector array.
- the sensor is set up so that, under certain conditions, the second luminescence signal and the luminescence signal of at least one of the other detectors of the sensor are used to check the decay time of the luminescence of the document of value.
- This other detector whose luminescence signal is used together with the second luminescence signal, is, for example, the first detector or one of the above-mentioned further detectors of the sensor.
- the conditions under which the second luminescence signal and the luminescence signal of the other detector are used to check the decay time can be predetermined.
- the conditions for the second luminescence signal and the luminescence signal of the other detector to be used to check the decay time can include measurement conditions for checking the value document and / or properties of the value document to be checked itself, e.g. the type of value document.
- the second luminescence signal and at least the luminescence signal of one of the other detectors of the sensor can be used to check the decay time, in particular the second and the first Luminescence signal or the second and the luminescence signal of at least one of the further detectors.
- the selection of those luminescence signals, on the basis of which the decay time is checked, can take place quasi online, e.g. on the basis of information that is only determined in the context of a check of the value document.
- the sensor is preferably set up to check the decay time of the luminescence of the document of value based on the first and the second luminescence signal.
- the sensor can be configured to check the decay time either based on the first and the second luminescence signal or based on the first and the third luminescence signal.
- the selection of the first and second or the first and third luminescence signal can be made as a function of the measurement conditions and / or as a function of the properties of the document of value to be checked.
- the sensor can also be set up to measure the decay time of the luminescence of the value document either based on the first and the second luminescence signal or based on the to check the first and the third luminescence signal or based on the first and the second and the third luminescence signal.
- Information about the speed of movement of the document of value relative to the sensor can be made available to the sensor.
- the speed of movement of the document of value can be set in the sensor.
- the information about the speed of movement used when checking the document of value can also be supplied to the sensor from outside, e.g. through the device in which the sensor is installed. This can be done before the document of value is checked.
- the sensor can also, quasi online, receive the actual speed of movement or a movement cycle of the document of value to be checked, e.g. from the device which also controls the movement of the document of value.
- the movement speed of the value document can be determined from the movement of the value documents with the aid of one or more light barriers.
- the light barriers can be arranged in the device along the transport path of the document of value before and / or after the sensor.
- the speed of movement can be determined from the time interval between the signals of two light barriers which are arranged at a certain distance along the transport path, e.g. based on the time interval between the edges of the value document or another structure of the signals.
- the speed of movement can, however, also be determined mechanically, e.g. with the aid of a wheel that is moved along with the transport system, the document of value, the sheet or the material web.
- the sensor according to the invention can, however, also itself be designed to determine the speed of movement of the documents of value.
- one or more light barriers can be placed in the sensor for this purpose be integrated.
- the sensor has a light barrier along the transport path in front of the detection areas of the detectors, the luminescence signals of which the sensor uses to check the decay time, and a light barrier after this.
- the movement speed can then be determined from the time distance between the value document edges or another structure of the light barrier signals.
- the speed of movement can also be determined from the signal from a single light barrier of the sensor.
- the speed of movement of the document of value can, however, also be determined from the luminescence signals that the sensor detects.
- the speed of movement can be determined by comparing the luminescence signals that have been detected by at least two of the detectors as a function of time, for example by comparing the luminescence signals of the first and second detectors.
- the comparison provides the time interval between the luminescence signals with which the luminescence signals are detected due to the local offset of the detectors along the direction of movement.
- the time interval between certain structures of the luminescence signal or the rise or fall of the detected luminescence signals at the front or rear edge of the document of value can be used.
- the speed of movement of the respective document of value can be determined from the determined time interval and the known spatial offset of the detectors along the transport direction. If the length of the document of value or the length of a structure of the document of value are known, the speed of movement can also be determined from the luminescence signal of a single one of the detectors of the sensor.
- the senor is set up so that the selection of the luminescence signals that are used to check the decay time of the luminescence is made as a function of the movement speed at which the value document and the sensor are moved relative to one another when checking the value document.
- the sensor is set up to check the decay time of the luminescence based on the first and the second luminescence signal below a first speed threshold of the movement speed.
- the decay time of the luminescence can be checked based on the first and the third luminescence signal, the second speed threshold being greater than or equal to the first speed threshold.
- the decay time of the luminescence can be checked between the first and the second speed threshold based on the first, the second and the third luminescence signal.
- the sensor forms, for example, the ratio of the second and the first luminescence signal and / or the ratio of the third and the first luminescence signal.
- the respective ratio can, for example, be compared with one or more thresholds in order to check whether the decay time is below or above a certain time or is within a certain time window.
- the first detector has a spectral sensitivity that differs from the spectral sensitivity of the second detector and from the spectral sensitivity of the third detector.
- the spectral sensitivity of the first detector differs from that of the second and third detectors in such a way that an additional emission light of a document of value to be checked is contained in another
- the spectral range lies as the luminescent light, the decay time of which is checked by the sensor, can be detected either by the first detector or by both the second and the third detector.
- the additional emission light can lie in a longer-wave or in a shorter-wave spectral range than the luminescent light, the decay time of which is checked.
- the additional emission light can only be detected with the first detector and the additional emission light cannot be detected by the second and third detectors.
- the additional emission light can only be detected with the second and the third detector, and the additional emission light cannot be detected with the first detector.
- different types of detectors can be used, but a different spectral filter can also be used for the first detector than for the second and third detectors.
- the additional emission light can also be a luminescence of the document of value.
- the additional emission light for which the sensor is set up to check, can be emission light which is emitted by the same document of value from whose luminescent light the decay time is checked.
- the additional emission light of a value document area is checked which is outside the value document area in which the value document emits the abovementioned luminescence.
- the two value document areas of the value document can be separate value document areas or partially overlap. In the latter case, however, the decay time of the luminescence is preferably checked outside of the overlap area.
- the additional emission light can, however, also be the emission light of other documents of value that differ from those documents of value from whose luminescent light the decay time is checked.
- the preceding detection area overlaps with the illuminated section in such a way that, when checking the document of value, only a sub-area of the preceding detection area is illuminated with excitation light, this sub-area, viewed along the direction of movement, being arranged at the end of the preceding detection area.
- the illuminated sub-area of the preceding detection area extends in particular, viewed along the direction of movement, from the center of the preceding detection area or from a location after the middle of the preceding detection area to the end of the preceding detection area.
- the illuminated sub-area of the preceding detection area preferably comprises between 20% and 50% of the preceding detection area in terms of area.
- the first detection area overlaps with the illuminated section in the measuring plane in such a way that, when checking the document of value, only a partial area of the first detection area is illuminated with excitation light which, viewed along the direction of movement, is arranged at the beginning of the first detection area.
- the center of the illuminated section viewed along the direction of movement, is positioned in front of the first detection area.
- the illuminated sub-area of the first detection area extends, viewed along the direction of movement, from the beginning of the first detection area, preferably to the center of the first detection area. Along the direction of movement there is no overlap with the illumination area from the center of the first detection area to the end of the first detection area in the measuring plane.
- the first detection area in the measuring plane has the greatest overlap with the illuminated section.
- the illuminated sub-area of the first detection area preferably comprises at least 30% of the first detection area in terms of area.
- the first detection area overlaps with the illuminated section in such a way that, when checking the value document, essentially half of the first detection area is illuminated with excitation light.
- the invention also relates to a device which is set up to use the sensor according to the invention for checking documents of value.
- the device can be a checking device for value documents, which checks the value documents for their authenticity, a deposit device or a processing machine for value documents, which can check the value documents and, if necessary, sort them.
- the invention also relates to a method for checking a document of value, with the following steps: the document of value and a sensor, which is set up for checking the document of value, are moved relative to one another for checking the document of value, the document of value moving along a direction of movement relative to the sensor and moved relative to the illuminated section.
- a section of a measuring plane of the sensor is illuminated by an illumination device, so that the document of value is illuminated with excitation light in the illuminated section when it is moved relative to the sensor and relative to the illuminated section.
- the sensor has several detectors which detect luminescent light which the document of value illuminated with the excitation light is in emits different detection areas of the measuring plane.
- the decay time of a luminescence of the document of value is then checked based on the luminescence signals of the detectors.
- the detection areas of the detectors are arranged offset from one another along the direction of movement of the document of value.
- a first of the detectors generates a first luminescence signal of a first detection area which overlaps with the illuminated section in the measuring plane
- a second of the detectors generates a second luminescence signal of a preceding detection area which, viewed along the direction of movement, is in front of the first detection area is arranged in the measuring plane.
- a third of the detectors can generate a third luminescence signal of a subsequent detection area which, viewed along the direction of movement, is arranged after the first detection area in the measurement plane. Analogous to the other special features of the sensor for which the sensor is set up, corresponding method steps can be carried out in the method according to the invention.
- the relative movement between the sensor and the document of value to be checked can be carried out by the above-mentioned device.
- the remaining method steps can be carried out by the sensor described above.
- the lighting device can be part of the sensor.
- the decay time can be checked by the sensor itself. Alternatively, the decay time can also be checked outside the sensor.
- FIG. 1a-c the structure of a sensor 100 for checking documents of value is shown schematically (xz plane).
- a value document W is moved along a direction of movement T relative to the sensor 100 and passes through a measuring plane E of the sensor 100.
- the value document plane lies approximately in the measuring plane E of the sensor 100.
- To check the value document it is through an illuminated section B of the measuring plane E moves in the excitation light of a lighting device 8 of the Sensor 100 hits the measuring plane, cf.
- Figure 1a The beam path of the excitation light leads from the lighting device 8 via a lens 9 to a beam splitter 6, which deflects a portion of the excitation light and from which the excitation light is directed via a further lens 7 onto the measuring plane E.
- the excitation light of the lighting device 8 leads to an optical excitation of the luminescence of the document of value W and can be, for example, in the ultraviolet, in the visible or in the infrared spectral range.
- a lamp, one or more light-emitting diodes or one or more lasers, for example, can be used as the lighting device.
- the sensor also contains several detectors 1, 2, 3, which can be applied to a common carrier 4, for example.
- Individual photodiodes or individual phototransistors, for example, can be used as detectors, but a photodetector line or a two-dimensional photodetector array can also be used for this purpose, the individual elements of which form the detectors.
- Each of the detectors is designed to detect luminescent light from the document of value, which can be in the ultraviolet, visible or infrared spectral range.
- the detectors can be provided with a spectral filter (not shown) which suppresses the spectral range of the illuminating light and / or only lets through the luminescent light to be detected.
- the detectors detect the luminescence light emanating from the respective detection area of the respective detector located in the measuring plane E.
- the first detector 1 detects the luminescence light emanating from a first detection area D1
- the second detector 2 the luminescence light emanating from a preceding detection area D2, which is arranged in front of the first detection area D1 along the direction of movement T of the document of value
- the third Detector 3 the luminescent light emanating from a subsequent detection area D3, which, along the direction of movement T of the document of value W, is arranged after the first detection area D1, cf.
- Figure 1b The luminescent light of the respective detection area D1-D3 is collected by the lens 7, passes the beam splitter 6 and is focused by the lens 5 onto the respective detector 1-3.
- the first detection area D1 and the preceding detection area D2 are positioned so as to partially overlap with the illuminated portion B.
- the following detection area D3 lies outside the illuminated section B, cf. Figure 1c .
- the luminescent light of the document of value W is continuously detected by the detectors 1, 2, 3, for example over the entire document of value W while it is being moved relative to the sensor 100.
- Figure 2a shows a plan view of the measuring plane E of the sensor 100 (xy plane), from which the relative arrangement of the illuminated section B and the detection areas D1, D2, D3 can be seen.
- the shape of the illuminated section B and of the detection areas D1, D2, D3 can each be as desired.
- the shape of the illuminated section B is rectangular and that of the detection areas D1, D2, D3 is circular.
- the illuminated section B overlaps with the first detection area D1 in an illuminated sub-area D10 of the first detection area D1 and with the preceding detection area D2 in an illuminated sub-area D20 of the preceding detection area D2.
- the value document W moves through the in Figure 2a
- the shown section of the measuring plane E along the direction of movement T (x-direction).
- the detectors 1, 2, 3 continuously detect the luminescence intensity emitted by the value document W, while the value document W moves along the direction of movement T through the measuring plane E of the sensor 100.
- this continuously detected luminescence intensity L is plotted in each case as a function of the spatial coordinate x parallel to the direction of movement T of the document of value W.
- the luminescence intensities are standardized to the respective intensity maximum.
- the one detected by detectors 1, 2, 3 remains in the Figures 3a-d applied luminescence intensity is the same as long as a homogeneously luminescent value document area is moved through the detection areas D1, D2, D3.
- FIG. 3a-d The detection areas D1-D3 and the illuminated section B are shown at the top in each case at the corresponding x positions.
- the Figures 3a and 3c show the luminescence intensity for the case of a low movement speed v g of the document of value W
- the Figures 3b and 3d the case of a high speed of movement v h .
- the luminescence intensity L of a "slow" luminescent substance is plotted in each case, the luminescence intensity of which has a long decay time ⁇ l
- the luminescence intensity L of a "fast” luminescent substance the luminescence intensity of which has a short decay time ⁇ k
- the highest luminescence intensity is detected in the first detection area D1. Whether and how much luminescence intensity can be detected in the preceding and following detection areas D2 and D3 depends on the decay time of the luminescence and the speed of movement of the document of value W.
- the luminescence signal S2 of the second detector 2 is very low, cf. Figure 4c .
- the luminescence signals S1 and S3 of the first and third detectors 1, 3 are used to check the decay time of the luminescence.
- the ratio S3 / S1 can be formed, on the basis of which the decay time of the luminescence can be checked and, if necessary, clearly determined, cf. Figure 5a .
- the first detector 1 detects a significant luminescence signal S1 and S3, cf.
- the luminescence signal S2 of the second detector 2 is very low, cf. Figure 4c .
- the luminescence signals S1 and S3 of the first and third detectors 1, 3 are used to check the decay time of the luminescence.
- the ratio S3 / S1 can be formed, on the basis of which the decay time of the luminescence can be checked and, if necessary, clearly determined, cf. Figure 5a .
- the first detector 1 detects a considerable luminescence signal S1, cf. Figure 4a .
- the luminescence signal S3 of the third detector 3 is, however, negligibly small in this case, cf. Figure 4b .
- the luminescence signal of the second detector 2 is considerable in this case, cf. Figure 4c .
- the luminescence signals S1 and S2 of the first and second detectors 1, 2 are used to check the decay time of the luminescence.
- the ratio S2 / S1 can be formed, on the basis of which the decay time of the luminescence can be checked and, if necessary, clearly determined, cf. Figure 5b .
- the decay time of the luminescence can also be checked on the basis of all three luminescence signals S1, S2 and S3.
- a decay time ⁇ which corresponds approximately to the mean value of the decay times ⁇ k and ⁇ l would then produce clear luminescence signals S1, S2, S3 in all three detectors 1, 2 and 3.
- the decay time ⁇ can be checked, for example, in a certain medium speed range using all three luminescence signals S1, S2 and S3, for example by forming both ratios S3 / S1 and S2 / S1, and at low speeds using the first and second luminescence signals S1, S2.
- the detectors 1, 2 and 3 can have similar or the same spectral sensitivity. In the following exemplary embodiment, however, the first detector 1 has a different spectral sensitivity than the second detector 2 and the third detector 3, at least their spectral sensitivities are approximately the same. In the common spectral range which all three detectors 1, 2, 3 cover, their spectral sensitivity curve preferably runs at least approximately the same.
- the different spectral sensitivity of the first detector 1 ensures that the sensor 100, in addition to checking the decay time ⁇ , can also detect an additional emission light of the document of value W, for example the luminescence that is caused by a different luminescent substance than the luminescence of which Decay time ⁇ is checked.
- the additional emission light is preferably detected in a value document area in which the luminescence, the decay time ⁇ of which is checked, does not occur.
- a first detector 1 is used, the spectral sensitivity of which covers an additional spectral range which the second 2 and third detectors 3 neither cover.
- the spectral sensitivity of the first detector 1 extends into a longer-wave spectral range than that of the second 2 and third detectors 3.
- the first detector 1 detects a clear luminescence signal that corresponds to the additional luminescence intensity in the additional spectral range.
- the second 2 and third detectors 3 each detect no luminescence signal from a luminescence in this additional spectral range.
- the emission of the additional emission light is clearly detectable, since this case can be clearly distinguished from all cases in FIGS. 3, 4 and 5. Because there the second 2 or the third detector 3 always also detects a clear luminescence signal.
- a second 2 and a third detector 3 are used, their respective spectral sensitivity covers an additional spectral range that the first detector 1 does not cover.
- the spectral sensitivity of the second 2 and third detectors 3 each extends into a longer-wave spectral range than that of the first detector 1.
- the second 2 and third detector 3 each detect a clear luminescence signal, which is the one in the additional spectral range located additional luminescence intensity corresponds.
- the first detector 1 does not detect any luminescence signal from a luminescence in this additional spectral range, only the second or the third detector.
- the emission of the additional emission light is clearly detectable and clearly distinguishable from all cases of the Figures 3 , 4 and 5 . Because in each of the latter cases the first detector 1 detects a clear luminescence signal.
- Figure 2b shows another embodiment in which the sensor 100 has further detectors n which detect the luminescent light of the illuminated document of value W, which this emits in further detection areas Dn of the measuring plane E when it moves relative to the sensor 100.
- the further detection areas Dn are arranged, along the direction of movement T, after the preceding detection area D2, but before the first detection area D1.
- the first, the second, the third and the further detectors 1, 2, 3, n can be formed by a one-dimensional photodetector array in which the detectors are formed on the same substrate, for example. Analogously to the first, second and third detectors, the further detectors generate n further luminescence signals Sn of the further detection areas Dn.
- the sensor 100 further detectors m which detect the luminescence light of the illuminated document of value W in further detection areas Dm of the measuring plane E.
- the detection areas Dm are arranged after the first detection area D1 along the direction of movement T.
- the luminescence signals Sm can also be used to check the decay time of the luminescence.
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Description
Die Erfindung betrifft einen Sensor und ein Verfahren zur Prüfung von Wertdokumenten sowie eine Vorrichtung, die den Sensor aufweist.The invention relates to a sensor and a method for checking documents of value and a device which has the sensor.
Zur Prüfung von Wertdokumenten werden üblicherweise Sensoren verwendet, mit denen die Art der Wertdokumente bestimmt wird und/oder mit denen die Wertdokumente auf Echtheit und/oder auf ihren Zustand geprüft werden. Derartige Sensoren werden z.B. zur Prüfung von Banknoten, Schecks, Ausweisen, Kreditkarten, Scheckkarten, Tickets, Gutscheinen und dergleichen verwendet. Die Wertdokumente werden in einer Vorrichtung zur Wertdokumentbearbeitung geprüft, in der, je nach den zu prüfenden Wertdokumenteigenschaften, einer oder mehrere unterschiedliche Sensoren enthalten sind. Zur Prüfung der Wertdokumente werden diese üblicherweise relativ zu den Sensoren bewegt, wobei entweder das Wertdokument an dem Sensor vorbeitransportiert wird, wie es z.B. aus der
Ein zu prüfendes Wertdokument kann einen oder mehrere Lumineszenzstoffe aufweisen, von denen zum Beispiel die Abklingzeit und/oder spektrale Eigenschaften der Lumineszenz geprüft werden, wie es z.B. aus der
Ferner ist es bekannt, ein zu prüfendes Wertdokument an einer Position seines Transportwegs mit Anregungslicht zu beleuchten, und mit Hilfe eines Detektors, der mit einem Abstand zur Beleuchtung an einer nachfolgenden Position des Transportwegs angeordnet ist, die Lumineszenz des Wertdokuments zu erfassen. Wenn dabei als Detektor ein zweidimensionaler Bildsensor verwendet wird, kann aus dem räumlichen Abfall der Lumineszenz entlang der Bewegungsrichtung des Wertdokuments eine Abklingzeit der Lumineszenz des Wertdokuments ermittelt werden. Nachteilig ist dabei, dass im Fall einer geringeren Bewegungsgeschwindigkeit des Wertdokuments, mit diesem Verfahren nur ein beschränkter Wertebereich von Abklingzeiten bestimmt werden kann.It is also known to illuminate a value document to be checked with excitation light at a position of its transport path, and to detect the luminescence of the value document with the aid of a detector which is arranged at a distance from the illumination at a subsequent position of the transport path. If a two-dimensional image sensor is used as the detector, a decay time of the luminescence of the document of value can be determined from the spatial decrease in the luminescence along the direction of movement of the document of value. The disadvantage here is that in the case of a lower speed of movement of the document of value, only a limited range of values of decay times can be determined with this method.
Eine Aufgabe der vorliegenden Erfindung ist es, einen Sensor zur Prüfung von Wertdokumenten bereitzustellen, mit dem die Abklingzeit einer Lumineszenz des Wertdokuments auch bei geringen Bewegungsgeschwindigkeiten in einem großen Wertebereich von Abklingzeiten überprüfbar ist.One object of the present invention is to provide a sensor for checking documents of value with which the decay time of a luminescence of the document of value can be checked in a large value range of decay times even at low movement speeds.
Diese Aufgabe wird durch die Gegenstände der unabhängigen Ansprüche gelöst. In davon abhängigen Ansprüchen sind vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung angegeben.This object is achieved by the subjects of the independent claims. In the dependent claims, advantageous developments and refinements of the invention are given.
Der erfindungsgemäße Sensor ist zur Prüfung eines in einer Messebene des Sensors vorhandenen Wertdokuments ausgebildet. Zur Prüfung des Wertdokuments werden das Wertdokument und der Sensor relativ zueinander derart bewegt, dass sich das Wertdokument entlang einer Bewegungsrichtung relativ zu dem Sensor bewegt. Dabei wird üblicherweise das Wertdokument entlang der Bewegungsrichtung an dem ruhenden Sensor entlang bzw. vorbeitransportiert. Alternativ kann aber auch der Sensor gegenüber dem ruhenden Wertdokument transportiert werden oder es können beide transportiert werden. Der Sensor ist dazu eingerichtet, die Abklingzeit einer Lumineszenz des Wertdokuments zu überprüfen. Die Abklingzeit wird dabei basierend auf Lumineszenzsignalen von Detektoren des Sensors überprüft. Der Sensor kann nur zur Prüfung einzeln an dem Sensor vorbeitransportierter Wertdokumente verwendet werden, aber auch zur Prüfung eines Bogens mit mehreren Wertdokumenten oder einer durchgängigen Materialbahn, die entlang der Bewegungsrichtung eine Vielzahl von Wertdokumenten aufweist. Beispielsweise ist der Sensor auch zur Prüfung einer Materialbahn aus noch nicht fertig gestellten Wertdokumenten geeignet, um die Wertdokumente bereits bei ihrer Herstellung zu überprüfen.The sensor according to the invention is designed to check a value document present in a measuring plane of the sensor. To check the value document, the value document and the sensor are moved relative to one another in such a way that the value document moves along a direction of movement relative to the sensor. In this case, the value document is usually transported along or past the stationary sensor along the direction of movement. Alternatively, however, the sensor can also be transported in relation to the stationary value document, or both can be transported. The sensor is set up to check the decay time of a luminescence of the document of value. The decay time is checked based on luminescence signals from detectors of the sensor. The sensor can only be used for checking documents of value transported individually past the sensor, but also for checking a sheet with several documents of value or a continuous material web which has a multiplicity of documents of value along the direction of movement. For example, the sensor is also suitable for checking a web of material made up of documents of value that have not yet been completed in order to check the documents of value as they are being produced.
Der Sensor weist eine Beleuchtungseinrichtung auf, die zum Beleuchten eines Abschnitts der Messebene des Sensors verwendet wird, um das Wertdokument, wenn es sich relativ zu dem Sensor bewegt, in diesem Abschnitt der Messebene mit Anregungslicht zu beleuchten. Außerdem weist der Sensor mehrere Detektoren zum Detektieren von Lumineszenzlicht auf, welches das mit dem Anregungslicht beleuchtete Wertdokument, wenn es sich relativ zu dem Sensor bewegt, in verschiedenen Detektionsbereichen der Messebene aussendet. Die Detektionsbereiche der Detektoren des Sensors sind entlang der Bewegungsrichtung des Wertdokuments zueinander versetzt angeordnet. Der beleuchtete Abschnitt und die Detektionsbereiche der Detektoren liegen jeweils ortsfest in der Messebene des Sensors. Das Anregungslicht der Beleuchtungseinrichtung ist dazu ausgebildet, eine Lumineszenz des zu prüfenden Wertdokuments derart anzuregen, dass das Wertdokument Lumineszenzlicht emittiert, das durch die Detektoren detektierbar ist.The sensor has an illumination device which is used to illuminate a section of the measuring plane of the sensor in order to illuminate the value document, when it moves relative to the sensor, in this section of the measuring plane with excitation light. In addition, the sensor has several detectors for detecting luminescent light, which the value document illuminated with the excitation light emits in different detection areas of the measuring plane when it moves relative to the sensor. The detection areas of the detectors of the sensor are arranged offset from one another along the direction of movement of the document of value. The illuminated section and the detection areas of the detectors are each stationary in the measuring plane of the sensor. The excitation light of the lighting device is designed to excite a luminescence of the document of value to be checked in such a way that the document of value emits luminescent light which can be detected by the detectors.
Ein erster der Detektoren des Sensors ist zur Erzeugung eines ersten Lumineszenzsignals eines ersten Detektionsbereichs eingerichtet, der in der Messebene mit dem beleuchteten Abschnitt überlappt. Das erste Lumineszenzsignal entspricht dem im ersten Detektionsbereich detektierten Lumineszenzlicht. Ein zweiter der Detektoren des Sensors ist zur Erzeugung eines zweiten Lumineszenzsignals eines vorangehenden Detektionsbereichs eingerichtet, der, entlang der Bewegungsrichtung des Wertdokuments betrachtet, vor dem ersten Detektionsbereich in der Messebene angeordnet ist. Das zweite Lumineszenzsignal entspricht dem im vorangehenden Detektionsbereich detektierten Lumineszenzlicht. Entlang der Bewegungsrichtung betrachtet, weist der beleuchtete Abschnitt bevorzugt eine Länge auf, die größer oder gleich der Länge des ersten Detektionsbereichs ist.A first of the detectors of the sensor is set up to generate a first luminescence signal of a first detection area which overlaps with the illuminated section in the measuring plane. The first luminescence signal corresponds to the luminescent light detected in the first detection area. A second of the detectors of the sensor is set up to generate a second luminescence signal of a preceding detection area which, viewed along the direction of movement of the document of value, is arranged in front of the first detection area in the measuring plane. The second luminescence signal corresponds to the luminescence light detected in the preceding detection area. Viewed along the direction of movement, the illuminated section preferably has a length that is greater than or equal to the length of the first detection region.
Bevorzugt weist der Sensor außerdem einen dritten Detektor auf, der zur Erzeugung eines dritten Lumineszenzsignals eines nachfolgenden Detektionsbereichs eingerichtet ist. Der nachfolgende Detektionsbereich ist, entlang der Bewegungsrichtung betrachtet, nach dem ersten Detektionsbereich in der Messebene angeordnet. Das dritte Lumineszenzsignal entspricht dem im nachfolgenden Detektionsbereich detektierten Lumineszenzlicht. Der dritte Detektor ermöglicht, dass der Sensor lange Abklingzeiten genauer bestimmen kann. Der Sensor kann aber auch ohne den dritten Detektor realisiert werden. In einem Ausführungsbeispiel ist der nachfolgende Detektionsbereich, entlang der Bewegungsrichtung betrachtet, soweit nach dem ersten Detektionsbereich angeordnet, dass er nicht mit dem beleuchteten Abschnitt der Messebene überlappt.The sensor preferably also has a third detector which is set up to generate a third luminescence signal of a subsequent detection area. The subsequent detection area, viewed along the direction of movement, is arranged after the first detection area in the measuring plane. The third luminescence signal corresponds to the luminescence light detected in the subsequent detection area. The third detector enables the sensor to more accurately determine long decay times. However, the sensor can also be implemented without the third detector. In one embodiment, the subsequent detection area, viewed along the direction of movement, is arranged after the first detection area to the extent that it does not overlap with the illuminated section of the measurement plane.
Zur Prüfung des Wertdokuments wird der beleuchtete Abschnitt der Messebene kontinuierlich beleuchtet und das Lumineszenzlicht des Wertdokuments von den Detektoren, gleichzeitig zur Beleuchtung, kontinuierlich detektiert. Dadurch kann das Wertdokument ohne Unterbrechungen geprüft werden, im Gegensatz zu einer Prüfung mit gepulster Beleuchtung und dazu zeitversetzter Detektion. Vor den Detektoren ist üblicherweise ein spektraler Filter angeordnet, der das Anregungslicht der Beleuchtungseinrichtung blockiert, damit am Wertdokument gestreutes Anregungslicht nicht mit detektiert wird.To check the value document, the illuminated section of the measurement plane is continuously illuminated and the luminescent light of the value document is continuously detected by the detectors at the same time as the illumination. As a result, the value document can be checked without interruptions, in contrast to a check with pulsed lighting and detection with a time delay. In front of the detectors there is usually a spectral one Arranged filter that blocks the excitation light of the lighting device so that the excitation light scattered on the value document is not also detected.
Der Sensor kann außerdem einen oder mehrere weitere Detektoren aufweisen, die jeweils zur Erzeugung eines weiteren Lumineszenzsignals eines weiteren Detektionsbereichs eingerichtet sind. Der oder die weiteren Detektionsbereiche sind, entlang der Bewegungsrichtung des Wertdokuments betrachtet, nach dem vorangehenden Detektionsbereich und vor dem ersten Detektionsbereich in der Messebene angeordnet. Optional können auch die Lumineszenzsignale der weiteren Detektoren zu Überprüfung der Abklingzeit verwendet werden. Dazu kann z.B. jeweils das Verhältnis des Lumineszenzsignals eines der weiteren Detektoren zu dem ersten Lumineszenzsignal gebildet werden. Es ist vorteilhaft, auch das Lumineszenzsignal eines dieser weiteren Detektoren zur Überprüfung der Abklingzeit zu verwenden, da damit eine genauere Überprüfung oder Bestimmung der Abklingzeit möglich wird. Der erste, der zweite sowie gegebenenfalls die weiteren Detektoren und gegebenenfalls der dritte Detektor können z.B. durch ein ein- oder zweidimensionales Photodetektorarray gebildet werden.The sensor can also have one or more further detectors, each of which is set up to generate a further luminescence signal from a further detection area. The further detection area or areas, viewed along the direction of movement of the document of value, are arranged after the preceding detection area and in front of the first detection area in the measuring plane. Optionally, the luminescence signals from the other detectors can also be used to check the decay time. For this purpose, for example, the ratio of the luminescence signal from one of the further detectors to the first luminescence signal can be formed. It is advantageous to also use the luminescence signal from one of these further detectors to check the decay time, since this enables a more precise check or determination of the decay time. The first, the second and optionally the further detectors and optionally the third detector can be formed, for example, by a one- or two-dimensional photodetector array.
Der Sensor ist dazu eingerichtet, dass unter bestimmten Bedingungen das zweite Lumineszenzsignal und das Lumineszenzsignal zumindest eines der anderen Detektoren des Sensors zur Überprüfung der Abklingzeit der Lumineszenz des Wertdokuments verwendet werden. Dieser andere Detektor, dessen Lumineszenzsignal zusammen mit dem zweiten Lumineszenzsignal verwendet wird, ist z.B. der erste Detektor oder einer der oben genannten weiteren Detektoren des Sensors. Die Bedingungen, wann das zweite Lumineszenzsignal und das Lumineszenzsignal des anderen Detektors zur Überprüfung der Abklingzeit verwendet werden, können fest vorgegeben sein.The sensor is set up so that, under certain conditions, the second luminescence signal and the luminescence signal of at least one of the other detectors of the sensor are used to check the decay time of the luminescence of the document of value. This other detector, whose luminescence signal is used together with the second luminescence signal, is, for example, the first detector or one of the above-mentioned further detectors of the sensor. The conditions under which the second luminescence signal and the luminescence signal of the other detector are used to check the decay time can be predetermined.
Der Sensor kann aber auch dazu eingerichtet sein, dass diese Bedingungen nach der Inbetriebnahme des Sensors einstellbar sind. Zu den Bedingungen dafür, dass das zweite Lumineszenzsignal und das Lumineszenzsignal des anderen Detektors zur Überprüfung der Abklingzeit verwendet werden, können Messbedingungen zur Prüfung des Wertdokuments gehören und/oder Eigenschaften des zu prüfenden Wertdokuments selbst, z.B. die Art des Wertdokuments. Beispielsweise kann bei solchen Wertdokumenten, für deren Lumineszenz eine relativ kurze Abklingzeit erwartet wird, die geringer ist als eine vorgegebene Abklingzeit, das zweite Lumineszenzsignal und zumindest das Lumineszenzsignal eines der anderen Detektoren des Sensors zur Überprüfung der Abklingzeit verwendet werden, insbesondere das zweite und das erste Lumineszenzsignal oder das zweite und das Lumineszenzsignal zumindest eines der weiteren Detektoren. Die Auswahl derjenigen Lumineszenzsignale, auf deren Basis die Abklingzeit überprüft wird, kann quasi online erfolgen, z.B. anhand von Informationen, die erst im Rahmen einer Prüfung des Wertdokuments ermittelt werden.However, the sensor can also be set up so that these conditions can be set after the sensor has been put into operation. The conditions for the second luminescence signal and the luminescence signal of the other detector to be used to check the decay time can include measurement conditions for checking the value document and / or properties of the value document to be checked itself, e.g. the type of value document. For example, in those documents of value whose luminescence is expected to have a relatively short decay time, which is less than a predetermined decay time, the second luminescence signal and at least the luminescence signal of one of the other detectors of the sensor can be used to check the decay time, in particular the second and the first Luminescence signal or the second and the luminescence signal of at least one of the further detectors. The selection of those luminescence signals, on the basis of which the decay time is checked, can take place quasi online, e.g. on the basis of information that is only determined in the context of a check of the value document.
Bevorzugt ist der Sensor dazu eingerichtet, die Abklingzeit der Lumineszenz des Wertdokuments basierend auf dem ersten und dem zweiten Lumineszenzsignal zu überprüfen. Der Sensor kann dazu eingerichtet sein, die Abklingzeit wahlweise basierend auf dem ersten und dem zweiten Lumineszenzsignal oder basierend auf dem ersten und dem dritten Lumineszenzsignal zu überprüfen. Die Auswahl des ersten und zweiten oder des ersten und dritten Lumineszenzsignals kann in Abhängigkeit der Messbedingungen und/ oder in Abhängigkeit der Eigenschaften des zu prüfenden Wertdokuments getroffen werden. Der Sensor kann auch dazu eingerichtet sein, die Abklingzeit der Lumineszenz des Wertdokuments wahlweise basierend auf dem ersten und dem zweiten Lumineszenzsignal oder basierend auf dem ersten und dem dritten Lumineszenzsignal oder basierend auf dem ersten und dem zweiten und dem dritten Lumineszenzsignal zu überprüfen.The sensor is preferably set up to check the decay time of the luminescence of the document of value based on the first and the second luminescence signal. The sensor can be configured to check the decay time either based on the first and the second luminescence signal or based on the first and the third luminescence signal. The selection of the first and second or the first and third luminescence signal can be made as a function of the measurement conditions and / or as a function of the properties of the document of value to be checked. The sensor can also be set up to measure the decay time of the luminescence of the value document either based on the first and the second luminescence signal or based on the to check the first and the third luminescence signal or based on the first and the second and the third luminescence signal.
Dem Sensor können Informationen über die Bewegungsgeschwindigkeit des Wertdokuments relativ zu dem Sensor zur Verfügung gestellt werden. Beispielsweise kann die Bewegungsgeschwindigkeit des Wertdokuments in dem Sensor eingestellt sein. Die Information über die bei der Prüfung des Wertdokuments verwendete Bewegungsgeschwindigkeit kann dem Sensor auch von außen zugeführt werden, z.B. durch die Vorrichtung, in die der Sensor eingebaut ist. Dies kann vor der Prüfung des Wertdokuments erfolgen. Der Sensor kann auch, quasi online, die tatsächliche Bewegungsgeschwindigkeit erhalten oder einen Bewegungstakt des zu prüfenden Wertdokuments, z.B. von der Vorrichtung, die auch die Bewegung des Wertdokuments steuert. Die Bewegungsgeschwindigkeit des Wertdokuments kann aus der Bewegung der Wertdokumente mit Hilfe einer oder mehrerer Lichtschranken bestimmt werden. Die Lichtschranken können in der Vorrichtung entlang des Transportwegs des Wertdokuments vor und/oder nach dem Sensor angeordnet sein. Die Bewegungsgeschwindigkeit kann dabei aus dem zeitlichen Abstand der Signale zweier Lichtschranken ermittelt werden, die in einem bestimmten Abstand entlang des Transportwegs angeordnet sind, z.B. anhand des zeitlichen Abstands der Wertdokumentkanten oder einer anderen Struktur der Signale. Die Bewegungsgeschwindigkeit kann aber auch mechanisch, z.B. mit Hilfe eines durch das Transportsystem, durch das Wertdokument, durch den Bogen oder durch die Materialbahn mitbewegten Rads bestimmt werden.Information about the speed of movement of the document of value relative to the sensor can be made available to the sensor. For example, the speed of movement of the document of value can be set in the sensor. The information about the speed of movement used when checking the document of value can also be supplied to the sensor from outside, e.g. through the device in which the sensor is installed. This can be done before the document of value is checked. The sensor can also, quasi online, receive the actual speed of movement or a movement cycle of the document of value to be checked, e.g. from the device which also controls the movement of the document of value. The movement speed of the value document can be determined from the movement of the value documents with the aid of one or more light barriers. The light barriers can be arranged in the device along the transport path of the document of value before and / or after the sensor. The speed of movement can be determined from the time interval between the signals of two light barriers which are arranged at a certain distance along the transport path, e.g. based on the time interval between the edges of the value document or another structure of the signals. The speed of movement can, however, also be determined mechanically, e.g. with the aid of a wheel that is moved along with the transport system, the document of value, the sheet or the material web.
Der erfindungsgemäße Sensor kann aber auch selbst dazu ausgebildet sein, die Bewegungsgeschwindigkeit der Wertdokumente zu ermitteln. Beispielsweise können dazu eine oder mehrere Lichtschranken in den Sensor integriert sein. Beispielsweise weist der Sensor dazu eine Lichtschranke entlang des Transportwegs vor den Detektionsbereichen der Detektoren auf, deren Lumineszenzsignale der Sensor zur Überprüfung der Abklingzeit verwendet, und eine Lichtschranke nach diesen. Die Bewegungsgeschwindigkeit kann dann bei bekanntem Lichtschrankenabstand aus dem zeitlichen Abstand der Wertdokumentkanten oder einer anderen Struktur der Lichtschrankensignale ermittelt werden. Bei bekannter Länge des Wertdokuments oder bekannter Länge einer Struktur des Wertdokuments kann die Bewegungsgeschwindigkeit auch aus dem Signal einer einzigen Lichtschranke des Sensors ermittelt werden.The sensor according to the invention can, however, also itself be designed to determine the speed of movement of the documents of value. For example, one or more light barriers can be placed in the sensor for this purpose be integrated. For example, the sensor has a light barrier along the transport path in front of the detection areas of the detectors, the luminescence signals of which the sensor uses to check the decay time, and a light barrier after this. With a known light barrier distance, the movement speed can then be determined from the time distance between the value document edges or another structure of the light barrier signals. With a known length of the value document or a known length of a structure of the value document, the speed of movement can also be determined from the signal from a single light barrier of the sensor.
Die Bewegungsgeschwindigkeit des Wertdokuments kann aber auch aus den Lumineszenzsignalen bestimmt werden, die der Sensor detektiert. Beispielsweise kann die Bewegungsgeschwindigkeit durch Vergleichen der Lumineszenzsignale, die von mindestens zwei der Detektoren als Funktion der Zeit detektiert wurden, ermittelt werden, z.B. durch Vergleichen der Lumineszenzsignale des ersten und des zweiten Detektors. Der Vergleich liefert den zeitlichen Abstand der Lumineszenzsignale, mit der die Lumineszenzsignale, aufgrund des örtlichen Versatzes der Detektoren entlang der Bewegungsrichtung, detektiert werden. Dabei kann z.B. der zeitliche Abstand bestimmter Strukturen des Lumineszenzsignals verwendet werden oder der Anstieg bzw. Abfall der detektierten Lumineszenzsignale an der Vorder- oder Rückkante des Wertdokuments. Aus dem ermittelten zeitlichen Abstand und dem bekannten räumlichen Versatz der Detektoren entlang der Transportrichtung kann die Bewegungsgeschwindigkeit des jeweiligen Wertdokuments ermittelt werden. Bei bekannter Länge des Wertdokuments oder bekannter Länge einer Struktur des Wertdokuments kann die Bewegungsgeschwindigkeit auch aus dem Lumineszenzsignal eines einzigen der Detektoren des Sensors ermittelt werden.The speed of movement of the document of value can, however, also be determined from the luminescence signals that the sensor detects. For example, the speed of movement can be determined by comparing the luminescence signals that have been detected by at least two of the detectors as a function of time, for example by comparing the luminescence signals of the first and second detectors. The comparison provides the time interval between the luminescence signals with which the luminescence signals are detected due to the local offset of the detectors along the direction of movement. For example, the time interval between certain structures of the luminescence signal or the rise or fall of the detected luminescence signals at the front or rear edge of the document of value can be used. The speed of movement of the respective document of value can be determined from the determined time interval and the known spatial offset of the detectors along the transport direction. If the length of the document of value or the length of a structure of the document of value are known, the speed of movement can also be determined from the luminescence signal of a single one of the detectors of the sensor.
Insbesondere ist der Sensor dazu eingerichtet, dass die Auswahl der Lumineszenzsignale, die zur Überprüfung der Abklingzeit der Lumineszenz verwendet werden, in Abhängigkeit der Bewegungsgeschwindigkeit getroffen wird, mit der das Wertdokument und der Sensor bei der Prüfung des Wertdokuments relativ zueinander bewegt werden. Beispielsweise ist der Sensor dazu eingerichtet, unterhalb einer ersten Geschwindigkeitsschwelle der Bewegungsgeschwindigkeit die Abklingzeit der Lumineszenz basierend auf dem ersten und dem zweiten Lumineszenzsignal zu überprüfen. Zusätzlich kann oberhalb einer zweiten Geschwindigkeitsschwelle der Bewegungsgeschwindigkeit die Abklingzeit der Lumineszenz basierend auf dem ersten und dem dritten Lumineszenzsignal überprüft werden, wobei die zweite Geschwindigkeitsschwelle größer oder gleich der ersten Geschwindigkeitsschwelle ist. Außerdem kann zwischen der ersten und der zweiten Geschwindigkeitsschwelle die Abklingzeit der Lumineszenz basierend auf dem ersten, dem zweiten und dem dritten Lumineszenzsignal überprüft werden. Zur Überprüfung der Abklingzeit der Lumineszenz, bildet der Sensor beispielsweise das Verhältnis des zweiten und des ersten Lumineszenzsignals und/oder das Verhältnis des dritten und des ersten Lumineszenzsignals. Das jeweilige Verhältnis kann z.B. mit einer oder mehreren Schwellen verglichen werden, um zu überprüfen, ob die Abklingzeit unterhalb oder oberhalb einer bestimmten Zeit liegt oder in einem bestimmten Zeitfenster liegt.In particular, the sensor is set up so that the selection of the luminescence signals that are used to check the decay time of the luminescence is made as a function of the movement speed at which the value document and the sensor are moved relative to one another when checking the value document. For example, the sensor is set up to check the decay time of the luminescence based on the first and the second luminescence signal below a first speed threshold of the movement speed. In addition, above a second speed threshold of the movement speed, the decay time of the luminescence can be checked based on the first and the third luminescence signal, the second speed threshold being greater than or equal to the first speed threshold. In addition, the decay time of the luminescence can be checked between the first and the second speed threshold based on the first, the second and the third luminescence signal. To check the decay time of the luminescence, the sensor forms, for example, the ratio of the second and the first luminescence signal and / or the ratio of the third and the first luminescence signal. The respective ratio can, for example, be compared with one or more thresholds in order to check whether the decay time is below or above a certain time or is within a certain time window.
In einem Ausführungsbeispiel weist der erste Detektor eine spektrale Empfindlichkeit auf, die sich von der spektralen Empfindlichkeit des zweiten Detektors und von der spektralen Empfindlichkeit des dritten Detektors unterscheidet. Die spektrale Empfindlichkeit des ersten Detektors unterscheidet sich derart von der des zweiten und dritten Detektors, dass ein zusätzliches Emissionslicht eines zu prüfenden Wertdokuments, das in einem anderen Spektralbereich liegt als das Lumineszenzlicht, dessen Abklingzeit durch den Sensor überprüft wird, entweder durch den ersten Detektor oder jeweils sowohl durch den zweiten als auch durch den dritten Detektor detektierbar ist. Das zusätzliche Emissionslicht kann in einem langwelligeren oder in einem kurzwelligeren Spektralbereich liegen als das Lumineszenzlicht, dessen Abklingzeit überprüft wird. Zum Beispiel ist das zusätzliche Emissionslicht nur mit dem ersten Detektor detektierbar und durch den zweiten und dritten Detektor ist das zusätzliche Emissionslicht jeweils nicht detektierbar. Alternativ ist das zusätzliche Emissionslicht nur jeweils mit dem zweiten und dem dritten Detektor detektierbar und durch den ersten Detektor ist das zusätzliche Emissionslicht nicht detektierbar. Um eine unterschiedliche spektrale Empfindlichkeit der Detektoren zu erhalten, können verschiedenartige Detektoren verwendet werden, es kann aber auch für den ersten Detektor ein anderer spektraler Filter verwendet werden als für den zweiten und dritten Detektor. Bei dem zusätzlichen Emissionslicht kann es sich ebenfalls um eine Lumineszenz des Wertdokuments handeln.In one embodiment, the first detector has a spectral sensitivity that differs from the spectral sensitivity of the second detector and from the spectral sensitivity of the third detector. The spectral sensitivity of the first detector differs from that of the second and third detectors in such a way that an additional emission light of a document of value to be checked is contained in another The spectral range lies as the luminescent light, the decay time of which is checked by the sensor, can be detected either by the first detector or by both the second and the third detector. The additional emission light can lie in a longer-wave or in a shorter-wave spectral range than the luminescent light, the decay time of which is checked. For example, the additional emission light can only be detected with the first detector and the additional emission light cannot be detected by the second and third detectors. Alternatively, the additional emission light can only be detected with the second and the third detector, and the additional emission light cannot be detected with the first detector. In order to obtain a different spectral sensitivity of the detectors, different types of detectors can be used, but a different spectral filter can also be used for the first detector than for the second and third detectors. The additional emission light can also be a luminescence of the document of value.
Das zusätzliche Emissionslicht, zu dessen Prüfung der Sensor eingerichtet ist, kann Emissionslicht sein, das von demselben Wertdokument ausgesendet wird, von dessen Lumineszenzlicht die Abklingzeit überprüft wird. Dabei wird z.B. das zusätzliche Emissionslicht eines Wertdokumentbereichs überprüft, der außerhalb des Wertdokumentbereichs liegt, in dem das Wertdokument die oben genannte Lumineszenz aussendet. Die beiden Wertdokumentbereiche des Wertdokuments können voneinander getrennte Wertdokumentbereiche sein oder teilweise überlappen. Die Abklingzeit der Lumineszenz wird im letzteren Fall aber vorzugsweise außerhalb des Überlappungsbereichs überprüft. Das zusätzliche Emissionslicht kann aber auch das Emissionslicht anderer Wertdokumente sein, die sich von denjenigen Wertdokumenten, von deren Lumineszenzlicht die Abklingzeit überprüft wird, unterscheiden.The additional emission light, for which the sensor is set up to check, can be emission light which is emitted by the same document of value from whose luminescent light the decay time is checked. In this case, for example, the additional emission light of a value document area is checked which is outside the value document area in which the value document emits the abovementioned luminescence. The two value document areas of the value document can be separate value document areas or partially overlap. In the latter case, however, the decay time of the luminescence is preferably checked outside of the overlap area. The additional emission light can, however, also be the emission light of other documents of value that differ from those documents of value from whose luminescent light the decay time is checked.
In der Messebene überlappt der vorangehende Detektionsbereich derart mit dem beleuchteten Abschnitt, dass, bei der Prüfung des Wertdokuments, nur ein Teilbereich des vorangehenden Detektionsbereichs mit Anregungslicht beleuchtet wird, wobei dieser Teilbereich, entlang der Bewegungsrichtung betrachtet, am Ende des vorangehenden Detektionsbereichs angeordnet ist. Der beleuchtete Teilbereich des vorangehenden Detektionsbereichs erstreckt sich insbesondere, entlang der Bewegungsrichtung betrachtet, von der Mitte des vorangehenden Detektionsbereichs oder von einem Ort nach der Mitte des vorangehenden Detektionsbereichs bis zum Ende des vorangehenden Detektionsbereichs. Entlang der Bewegungsrichtung besteht vom Anfang bis zur Mitte des vorangehenden Detektionsbereichs in der Messebene dabei kein Überlapp zwischen dem vorangehenden Detektionsbereich und dem beleuchteten Abschnitt. Bevorzugt umfasst der beleuchtete Teilbereich des vorangehenden Detektionsbereichs flächenmäßig zwischen 20% und 50% des vorangehenden Detektionsbereichs.In the measuring plane, the preceding detection area overlaps with the illuminated section in such a way that, when checking the document of value, only a sub-area of the preceding detection area is illuminated with excitation light, this sub-area, viewed along the direction of movement, being arranged at the end of the preceding detection area. The illuminated sub-area of the preceding detection area extends in particular, viewed along the direction of movement, from the center of the preceding detection area or from a location after the middle of the preceding detection area to the end of the preceding detection area. Along the direction of movement, from the beginning to the middle of the preceding detection area in the measuring plane, there is no overlap between the preceding detection area and the illuminated section. The illuminated sub-area of the preceding detection area preferably comprises between 20% and 50% of the preceding detection area in terms of area.
Der erste Detektionsbereich überlappt in der Messebene derart mit dem beleuchteten Abschnitt, dass, bei der Prüfung des Wertdokuments, nur ein Teilbereich des ersten Detektionsbereichs mit Anregungslicht beleuchtet wird, der entlang der Bewegungsrichtung betrachtet, am Anfang des ersten Detektionsbereichs angeordnet ist. In einem ersten Ausführungsbeispiel ist die Mitte des beleuchteten Abschnitts, entlang der Bewegungsrichtung betrachtet, vor dem ersten Detektionsbereich positioniert. Der beleuchtete Teilbereich des ersten Detektionsbereichs, erstreckt sich, entlang der Bewegungsrichtung betrachtet, vom Anfang des ersten Detektionsbereichs vorzugsweise bis zur Mitte des ersten Detektionsbereichs. Entlang der Bewegungsrichtung besteht von der Mitte des ersten Detektionsbereichs bis zum Ende des ersten Detektionsbereichs in der Messebene dabei kein Überlapp mit dem Beleuchtungsbereich. Von allen Detektionsbereichen hat in diesem Ausführungsbeispiel der erste Detektionsbereich in der Messebene den größten Überlapp mit dem beleuchteten Abschnitt. Bevorzugt umfasst der beleuchtete Teilbereich des ersten Detektionsbereichs flächenmäßig mindestens 30% des ersten Detektionsbereichs. Insbesondere überlappt erste Detektionsbereich derart mit dem beleuchteten Abschnitt, dass, bei der Prüfung des Wertdokuments, im Wesentlichen die Hälfte des ersten Detektionsbereichs mit Anregungslicht beleuchtet wird.The first detection area overlaps with the illuminated section in the measuring plane in such a way that, when checking the document of value, only a partial area of the first detection area is illuminated with excitation light which, viewed along the direction of movement, is arranged at the beginning of the first detection area. In a first exemplary embodiment, the center of the illuminated section, viewed along the direction of movement, is positioned in front of the first detection area. The illuminated sub-area of the first detection area extends, viewed along the direction of movement, from the beginning of the first detection area, preferably to the center of the first detection area. Along the direction of movement there is no overlap with the illumination area from the center of the first detection area to the end of the first detection area in the measuring plane. In this exemplary embodiment, of all the detection areas, the first detection area in the measuring plane has the greatest overlap with the illuminated section. The illuminated sub-area of the first detection area preferably comprises at least 30% of the first detection area in terms of area. In particular, the first detection area overlaps with the illuminated section in such a way that, when checking the value document, essentially half of the first detection area is illuminated with excitation light.
Die Erfindung betrifft außerdem eine Vorrichtung, die dazu eingerichtet ist den erfindungsgemäßen Sensor zur Prüfung von Wertdokumenten zu verwenden. Die Vorrichtung kann eine Prüfvorrichtung für Wertdokumente sein, die die Wertdokumente auf ihre Echtheit prüft, eine Einzahlvorrichtung oder eine Bearbeitungsmaschine für Wertdokumente, die die Wertdokumente prüfen und gegebenenfalls sortieren kann.The invention also relates to a device which is set up to use the sensor according to the invention for checking documents of value. The device can be a checking device for value documents, which checks the value documents for their authenticity, a deposit device or a processing machine for value documents, which can check the value documents and, if necessary, sort them.
Außerdem betrifft die Erfindung ein Verfahren zur Prüfung eines Wertdokuments, mit folgenden Schritten: Das Wertdokument und ein Sensor, der zur Prüfung des Wertdokuments eingerichtet ist, werden zur Prüfung des Wertdokuments relativ zueinander bewegt, wobei sich das Wertdokument entlang einer Bewegungsrichtung relativ zu dem Sensor und relativ zu dem beleuchteten Abschnitt bewegt. Durch eine Beleuchtungseinrichtung wird ein Abschnitt einer Messebene des Sensors beleuchtet, so dass das Wertdokument, bei Bewegen relativ zu dem Sensor und relativ zu dem beleuchteten Abschnitt, in dem beleuchteten Abschnitt mit Anregungslicht beleuchtet wird. Der Sensor weist mehrere Detektoren auf, die Lumineszenzlicht detektieren, welches das mit dem Anregungslicht beleuchtete Wertdokument in verschiedenen Detektionsbereichen der Messebene aussendet. Basierend auf den Lumineszenzsignalen der Detektoren wird anschließend die Abklingzeit einer Lumineszenz des Wertdokuments überprüft. Die Detektionsbereiche der Detektoren sind entlang der Bewegungsrichtung des Wertdokuments zueinander versetzt angeordnet. Beim Schritt des Detektierens erzeugt ein erster der Detektoren ein erstes Lumineszenzsignals eines ersten Detektionsbereichs, der in der Messebene mit dem beleuchteten Abschnitt überlappt, und ein zweiter der Detektoren ein zweites Lumineszenzsignal eines vorangehenden Detektionsbereichs erzeugt, der, entlang der Bewegungsrichtung betrachtet, vor dem ersten Detektionsbereich in der Messebene angeordnet ist.The invention also relates to a method for checking a document of value, with the following steps: the document of value and a sensor, which is set up for checking the document of value, are moved relative to one another for checking the document of value, the document of value moving along a direction of movement relative to the sensor and moved relative to the illuminated section. A section of a measuring plane of the sensor is illuminated by an illumination device, so that the document of value is illuminated with excitation light in the illuminated section when it is moved relative to the sensor and relative to the illuminated section. The sensor has several detectors which detect luminescent light which the document of value illuminated with the excitation light is in emits different detection areas of the measuring plane. The decay time of a luminescence of the document of value is then checked based on the luminescence signals of the detectors. The detection areas of the detectors are arranged offset from one another along the direction of movement of the document of value. In the detection step, a first of the detectors generates a first luminescence signal of a first detection area which overlaps with the illuminated section in the measuring plane, and a second of the detectors generates a second luminescence signal of a preceding detection area which, viewed along the direction of movement, is in front of the first detection area is arranged in the measuring plane.
Außerdem kann beim Schritt des Detektierens ein dritter der Detektoren ein drittes Lumineszenzsignals eines nachfolgenden Detektionsbereichs erzeugen, der, entlang der Bewegungsrichtung betrachtet, nach dem ersten Detektionsbereich in der Messebene angeordnet ist. Analog zu den weiteren Besonderheiten des Sensors, zu denen der Sensor eingerichtet ist, können bei dem erfindungsgemäßen Verfahren entsprechende Verfahrensschritte durchgeführt werden.In addition, in the detection step, a third of the detectors can generate a third luminescence signal of a subsequent detection area which, viewed along the direction of movement, is arranged after the first detection area in the measurement plane. Analogous to the other special features of the sensor for which the sensor is set up, corresponding method steps can be carried out in the method according to the invention.
Die relative Bewegung zwischen dem Sensor und dem zu prüfenden Wertdokument können durch die oben genannte Vorrichtung durchgeführt werden. Die übrigen Verfahrensschritte können durch den oben beschriebenen Sensor durchgeführt werden. Die Beleuchtungseinrichtung kann ein Bestandteil des Sensors sein. Die Abklingzeit kann durch den Sensor selbst überprüft werden. Alternativ kann die Überprüfung der Abklingzeit aber auch außerhalb des Sensors durchgeführt werden.The relative movement between the sensor and the document of value to be checked can be carried out by the above-mentioned device. The remaining method steps can be carried out by the sensor described above. The lighting device can be part of the sensor. The decay time can be checked by the sensor itself. Alternatively, the decay time can also be checked outside the sensor.
Nachfolgend wird die Erfindung beispielhaft anhand der folgenden Figuren erläutert.The invention is explained below by way of example with reference to the following figures.
Es zeigen:
- Figur 1a-c
- Schematischer Aufbau des Sensors mit dem Beleuchtungsstrahlengang und dem beleuchtetem Abschnitt B (
Fig. 1a, 1c ) und mit den Detektionsstrahlengängen und den Detektionsbereichen D1, D2, D3 (Fig. 1b, 1c ), - Figur 2a-b
- relative Anordnung des beleuchteten Abschnitts und der Detektionsbereiche in einer Draufsicht auf die Messebene des Sensors gemäß zweier Ausführungsbeispiele,
- Figur 3a-d
- Verlauf der Lumineszenzintensität als Funktion des Orts x entlang der Bewegungsrichtung des Wertdokuments, für zwei verschiedene Bewegungsgeschwindigkeiten und zwei verschiedene Abklingzeiten,
- Figur 4a-c
- Lumineszenzsignale S1, S2 und S3 der Detektoren D1, D2 und D3 als Funktion der Abklingzeit für zwei verschiedene Bewegungsgeschwindigkeiten,
- Figur 5a-b
- Verhältnis des dritten und ersten Lumineszenzsignals S3/S1 (
Fig. 5a ) und des zweiten und ersten Lumineszenzsignals S2/S1 als Funktion der Abklingzeit (Fig. 5b ).
- Figure 1a-c
- Schematic structure of the sensor with the illumination beam path and the illuminated section B (
Figures 1a, 1c ) and with the detection beam paths and the detection areas D1, D2, D3 (Figures 1b, 1c ), - Figure 2a-b
- relative arrangement of the illuminated section and the detection areas in a plan view of the measuring plane of the sensor according to two exemplary embodiments,
- Figure 3a-d
- Course of the luminescence intensity as a function of the location x along the direction of movement of the document of value, for two different speeds of movement and two different decay times,
- Figure 4a-c
- Luminescence signals S1, S2 and S3 from detectors D1, D2 and D3 as a function of the decay time for two different movement speeds,
- Figure 5a-b
- Ratio of the third and first luminescence signal S3 / S1 (
Figure 5a ) and the second and first luminescence signal S2 / S1 as a function of the decay time (Figure 5b ).
In den
Der Sensor enthält außerdem mehrere Detektoren 1, 2, 3, die z.B. auf einem gemeinsamen Träger 4 aufgebracht sein können. Als Detektoren können z.B. einzelne Photodioden oder einzelne Phototransistoren verwendet werden, es kann dazu aber auch eine Photodetektorzeile oder ein zweidimensionales Photodetektorarray verwendet werden, deren einzelne Elemente die Detektoren bilden. Jeder der Detektoren ist zur Detektion von Lumineszenzlicht des Wertdokuments ausgebildet, das im ultravioletten, im sichtbaren oder im infraroten Spektralbereich liegen kann. Die Detektoren können mit einem spektralen Filter versehen sein (nicht gezeigt), der den Spektralbereich des Beleuchtungslichts unterdrückt und/oder nur das zu detektierende Lumineszenzlicht durchlässt. Die Detektoren detektieren das Lumineszenzlicht, welches von dem jeweiligen in der Messebene E gelegenen Detektionsbereich des jeweiligen Detektors ausgeht. So detektiert der erste Detektor 1 das Lumineszenzlicht, das von einem ersten Detektionsbereich D1 ausgeht, der zweite Detektor 2 das Lumineszenzlicht, das von einem vorangehenden Detektionsbereich D2 ausgeht, der entlang der Bewegungsrichtung T des Wertdokuments vor dem ersten Detektionsbereich D1 angeordnet ist, und der dritte Detektor 3 das von einem nachfolgenden Detektionsbereich D3 ausgehende Lumineszenszlicht, der, entlang der Bewegungsrichtung T des Wertdokuments W, nach dem ersten Detektionsbereich D1 angeordnet ist, vgl.
Durch die Bewegung des Wertdokuments W entlang der Bewegungsrichtung T sendet nicht nur derjenige Wertdokumentbereich Lumineszenzlicht aus, der sich gerade im beleuchteten Abschnitt B befindet, sondern auch ein Wertdokumentbereich, der sich entlang der Bewegungsrichtung T an jenen anschließt. Der erste Detektionsbereich D1 und der vorangehende Detektionsbereich D2 sind so positioniert, dass sie teilweise mit dem beleuchteten Abschnitt B überlappen. Der nachfolgende Detektionsbereich D3 liegt in diesem Beispiel außerhalb des beleuchteten Abschnitts B, vgl.
Die Detektoren 1, 2, 3 detektieren die von dem Wertdokument W ausgesendete Lumineszenzintensität kontinuierlich, während sich das Wertdokument W entlang der Bewegungsrichtung T durch die Messebene E des Sensors 100 bewegt. In den
Außerdem sind in den
In den
Im Fall einer "langsamen" Lumineszenz mit Abklingzeit τl und einer hohen Bewegungsgeschwindigkeit vh (Fall der
Im Fall einer "schnellen" Lumineszenz mit Abklingzeit τk und einer geringen Bewegungsgeschwindigkeit vg (Fall der
Im Fall einer geringen oder einer mittleren Bewegungsgeschwindigkeit, die zwischen den beiden Geschwindigkeiten vg und vh liegt, kann die Abklingzeit der Lumineszenz auch anhand aller drei Lumineszenzsignale S1, S2 und S3 überprüft werden. Beispielsweise würde eine Abklingzeit τ, die etwa dem Mittelwert der Abklingzeit τk und τl entspricht, dann bei allen drei Detektoren 1, 2 und 3 deutliche Lumineszenzsignale S1, S2, S3 hervorrufen. Die Abklingzeit τ kann z.B. in einem bestimmten mittleren Geschwindigkeitsbereich anhand aller drei Lumineszenzsignale S1, S2 und S3 überprüft werden, z.B. unter Bildung beider Verhältnisse S3/S1 und S2/S1, und bei geringen Geschwindigkeiten anhand des ersten und zweiten Lumineszenzsignals S1, S2.In the case of a low or a medium speed of movement that lies between the two speeds v g and vh, the decay time of the luminescence can also be checked on the basis of all three luminescence signals S1, S2 and S3. For example, a decay time τ which corresponds approximately to the mean value of the decay times τ k and τ l would then produce clear luminescence signals S1, S2, S3 in all three
Die Detektoren 1, 2 und 3 können ähnliche oder die gleiche spektrale Empfindlichkeit aufweisen. In dem folgenden Ausführungsbeispiel weist der erste Detektor 1 jedoch eine andere spektrale Empfindlichkeit auf als der zweite Detektor 2 und der dritte Detektor 3, deren spektrale Empfindlichkeiten zumindest näherungsweise gleich sind. In dem gemeinsamen Spektralbereich, den alle drei Detektoren 1, 2, 3 abdecken, verläuft deren spektrale Empfindlichkeitskurve dabei vorzugsweise zumindest näherungsweise gleich. Durch die abweichende spektrale Empfindlichkeit des ersten Detektors 1 wird erreicht, dass der Sensor 100, neben der Überprüfung der Abklingzeit τ, auch ein zusätzliches Emissionslicht des Wertdokuments W nachweisen kann, z.B. die Lumineszenz, die von einem anderen Lumineszenzstoff hervorgerufen wird als die Lumineszenz, deren Abklingzeit τ überprüft wird. Das zusätzliche Emissionslicht wird dabei vorzugsweise in einem Wertdokumentbereich nachgewiesen, in dem die Lumineszenz, deren Abklingzeit τ überprüft wird, nicht auftritt.The
In einer ersten Variante dieses Ausführungsbeispiels wird ein erster Detektor 1 verwendet, dessen spektrale Empfindlichkeit einen zusätzlichen Spektralbereich abdeckt, den der zweite 2 und der dritte Detektor 3 beide nicht abdecken. Beispielsweise erstreckt sich die spektrale Empfindlichkeit des ersten Detektors 1 bis in einen langwelligeren Spektralbereich als die des zweiten 2 und des dritten Detektors 3. Bei dieser ersten Variante detektiert der erste Detektor 1 ein deutliches Lumineszenzsignal, das der in dem zusätzlichen Spektralbereich gelegenen zusätzlichen Lumineszenzintensität entspricht. Von einer Lumineszenz in diesem zusätzlichen Spektralbereich detektieren der zweite 2 und dritte Detektor 3 jeweils kein Lumineszenzsignal. Das Aussenden des zusätzlichen Emissionslichts ist eindeutig nachweisbar, da dieser Fall eindeutig unterscheidbar ist von allen Fällen der Figuren 3, 4 und 5. Denn dort detektiert immer auch der zweite 2 oder der dritte Detektor 3 ein deutliches Lumineszenzsignal.In a first variant of this exemplary embodiment, a
In einer zweiten Variante dieses Ausführungsbeispiels werden ein zweiter 2 und ein dritter Detektor 3 verwendet, deren spektrale Empfindlichkeit jeweils einen zusätzlichen Spektralbereich abdeckt, den der erste Detektor 1 nicht abdeckt. Beispielsweise erstreckt sich die spektrale Empfindlichkeit des zweiten 2 und des dritten Detektors 3 jeweils bis in einen langwelligeren Spektralbereich als die des ersten Detektors 1. Bei dieser zweiten Variante detektieren der zweite 2 und dritte Detektor 3 jeweils ein deutliches Lumineszenzsignal, das der in dem zusätzlichen Spektralbereich gelegenen zusätzlichen Lumineszenzintensität entspricht. Von einer Lumineszenz in diesem zusätzlichen Spektralbereich detektiert der erste Detektor 1 kein Lumineszenzsignal, nur der zweite oder der dritte Detektor. Auch bei dieser Variante ist das Aussenden des zusätzlichen Emissionslichts eindeutig nachweisbar und eindeutig unterscheidbar von allen Fällen der
Claims (13)
- A sensor (100) for checking a value document (W) present in a measuring plane (E) of the sensor, wherein, for checking the value document, the value document (W) and the sensor (100) are moved relative to each other such that the value document (W) moves along a moving direction (T) relative to the sensor (100), comprising:- an illumination device (8) for illuminating a section (B) of the measuring plane (E) of the sensor, in order to illuminate the value document (10), when it moves relative to the sensor (100), in the section (B) with excitation light, and- several detectors (1, 2, 3, n) for detecting luminescence light which the value document (W) illuminated with the excitation light sends out when it moves relative to the sensor (100), in different detection regions (D1, D2, D3, Dn) of the measuring plane (E), the detection regions (D1, D2, D3, Dn) of the detectors (1, 2, 3, n) being arranged mutually offset along the moving direction (T) of the value document (W),and wherein the sensor (100) is adapted to check the decay time of a luminescence of the value document (W) based on luminescence signals of the detectors (1, 2, 3, n), characterized in that- a first one of the detectors (1) is adapted for generating a first luminescence signal (S 1) of a first detection region (D1) which in the measuring plane (E) overlaps with the illuminated section (B) such that upon the check of the value document only a partial region (D10) of the first detection region (D1) is illuminated with excitation light, which partial region is arranged at the beginning of the first detection region (D1), viewed along the moving direction, and- a second one of the detectors (2) is adapted for generating a second luminescence signal (S2) of a preceding detection region (D2) which is arranged in the measuring plane (E) before the first detection region (D1), viewed along the moving direction (T), and in the measuring plane overlaps with the illuminated section such that upon the check of the value document only a partial region (D20) of the preceding detection region is illuminated with excitation light, which partial region is arranged at the end of the preceding detection region (D2), viewed along the moving direction.
- The sensor according to claim 1, characterized in that a third of the detectors (3) of the sensor is adapted to generate a third luminescence signal (S3) of a following detection region (D3) which is arranged in the measuring plane (E) after the first detection region (D1), viewed along the moving direction (T).
- The sensor according to claim 2, characterized in that the first detector (1) has a spectral sensitivity which differs from the spectral sensitivity of the second detector (2) and from the spectral sensitivity of the third detector (3) such that an additional emission light of a value document (W) to be checked, which lies in a spectral region different than the luminescence light, is detectable either by the first detector (1) or by both the second (2) as well as by the third detector (3), respectively.
- The sensor according to claim 2 or 3, characterized in that the sensor is adapted to check the decay time of the luminescence of the value document (W) based on the first (S 1) and the second luminescence signal (S2) or, selectively, based on the first (S 1) and the third luminescence signal (S3).
- The sensor according to any of the previous claims, characterized in that the sensor has one or several further detectors (n) which respectively are adapted to generate a further luminescence signal (Sn) of a further detection region (Dn), the one or more further detection regions (Dn) being arranged in the measuring plane (E) after the preceding detection region (D2) and before the first detection region (D1), viewed along the moving direction (T).
- The sensor according to any of the previous claims, characterized in that the sensor is adapted such that under certain conditions the second luminescence signal (S2) and the luminescence signal (S1, Sn) of at least one of the other detectors (1, 2, 3, n, m) of the sensor (100) are employed for checking the decay time of the luminescence of the value document.
- The sensor according to any of the previous claims, characterized in that the sensor is adapted such that for a value document (W) to be checked, for the luminescence of which there is expected a decay time that is shorter than a specified decay time, the second luminescence signal (S2) and the luminescence signal (S1, S3, Sn, Sm) of at least one of the other detectors (1, 2, 3, n, m) of the sensor (100) are employed for checking the decay time.
- The sensor according to any of claims 2 to 7, characterized in that the sensor is adapted such that the selection of the luminescence signals (S1, S2, S3) which are employed for checking the decay time of the luminescence is made in dependence on the speed of movement with which the value document (W) and the sensor (100) are moved relative to each other upon the check of the value document.
- The sensor according to any of the previous claims, characterized in that the sensor is adapted to check the decay time of the luminescence of the value document (W) based on the first (S1) and the second luminescence signal (S2).
- The sensor according to any of the previous claims, characterized in that the illuminated partial region (D20) of the preceding detection region (D2) extends from the center of the preceding detection region (D2) or from a place after the center of the preceding detection region (D2) to the end of the preceding detection region (D2), viewed along the moving direction (T).
- The sensor according to any of the previous claims, characterized in that the illuminated partial region (D10) of the first detection region (D1) extends at least from the beginning of the first detection region (D1) to the center of the first detection region (D1), viewed along the moving direction.
- An apparatus for checking value documents having a sensor according to one or several of the previous claims.
- A method for checking a value document, in particular with the help of a sensor according to one or several of the claims 1-11, having the steps:- moving a value document to be checked along a moving direction (T) relative to a sensor which is adapted for checking the value document, the value document moving along a moving direction (T) relative to the sensor,- illuminating a section (B) of a measuring plane (E) of the sensor by an illumination device (8), so that the value document, when moving relative to the sensor (100), is illuminated with excitation light in the illuminated section (B),- detecting luminescence light which the value document (W) illuminated with the excitation light sends out when it moves relative to the sensor (100), in different detection regions (D1, D2, D3) of the measuring plane (E), by several detectors, the detection regions (D1, D2, D3) of the detectors being arranged mutually offset along the moving direction (T) of the value document and wherein
a first one of the detectors (1) generates a first luminescence signal (S1) of a first detection region (D1) which in the measuring plane overlaps with the illuminated section (B) such that upon the check of the value document only a partial region (D10) of the first detection region (D1) is illuminated with excitation light, which partial region is arranged at the beginning of the first detection region (D1), viewed along the moving direction, and
a second one of the detectors (2) generates a second luminescence signal (S2) of a preceding detection region (D2) which is arranged in the measuring plane before the first detection region (D1), viewed along the moving direction (T), and in the measuring plane overlaps with the illuminated section such that upon the check of the value document only a partial region (D20) of the preceding detection region is illuminated with excitation light, which partial region is arranged at the end of the preceding detection region (D2), viewed along the moving direction,- checking the decay time of a luminescence of the value document based on the luminescence signals of the detectors.
Applications Claiming Priority (2)
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DE102010014912A DE102010014912A1 (en) | 2010-04-14 | 2010-04-14 | Sensor for checking value documents |
PCT/EP2011/001849 WO2011128080A1 (en) | 2010-04-14 | 2011-04-12 | Sensor for verifying value documents |
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EP2559010A1 EP2559010A1 (en) | 2013-02-20 |
EP2559010B1 true EP2559010B1 (en) | 2021-08-18 |
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EP11715177.9A Active EP2559010B1 (en) | 2010-04-14 | 2011-04-12 | Sensor for verifying value documents |
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EP (1) | EP2559010B1 (en) |
CN (1) | CN102893309B (en) |
DE (1) | DE102010014912A1 (en) |
ES (1) | ES2886756T3 (en) |
MX (1) | MX2012010028A (en) |
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JP6247747B2 (en) * | 2014-04-18 | 2017-12-13 | グローリー株式会社 | Paper sheet authenticity determination device and paper sheet authenticity determination method |
JP7111494B2 (en) | 2018-04-05 | 2022-08-02 | グローリー株式会社 | Light detection sensor, light detection device, sheet processing device, and light detection method |
DE102018109141A1 (en) * | 2018-04-17 | 2019-10-17 | Bundesdruckerei Gmbh | Smartphone-verifiable, fluorescent-based security feature and device for verification Smartcard-verifiable, fluorescent-based security feature and arrangement for verification |
DE102021000807A1 (en) * | 2021-02-16 | 2022-08-18 | Giesecke+Devrient Currency Technology Gmbh | Sensor for checking documents of value |
US20240135768A1 (en) * | 2021-02-16 | 2024-04-25 | Giesecke+Devrient Currency Technology Gmbh | Sensor for verifying the luminescence of value documents |
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DE1449107B1 (en) * | 1961-04-15 | 1969-09-04 | Telefunken Patent | Method for scanning recording media, the scanning field of which is provided with luminescent characters, in particular for automatic sorting of mail items |
DE69118429T2 (en) * | 1990-01-26 | 1996-09-12 | Canon Kk | Method of measuring a species using fluorescent light |
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DE19651101A1 (en) * | 1996-12-09 | 1998-06-10 | Giesecke & Devrient Gmbh | Device and method for the detection of fluorescent and phosphorescent light |
US6091563A (en) * | 1997-09-26 | 2000-07-18 | Iomega Corporation | Latent illuminance discrimination marker system for data storage cartridges |
US6380547B1 (en) * | 1998-06-09 | 2002-04-30 | Manuel E. Gonzalez | Tagging compositions and methods |
US6473165B1 (en) * | 2000-01-21 | 2002-10-29 | Flex Products, Inc. | Automated verification systems and methods for use with optical interference devices |
EP1158459B2 (en) * | 2000-05-16 | 2017-02-15 | Sicpa Holding Sa | Method, device and security system, all for authenticating a marking |
ES2392395T3 (en) * | 2001-03-01 | 2012-12-10 | Sicpa Holding Sa | Enhanced luminescence feature detector |
DE10322794B4 (en) * | 2003-05-19 | 2011-08-11 | Bundesdruckerei GmbH, 10969 | Sensor for authenticating a luminescent security element of a value document, value document and method for producing a value document |
DE10346631A1 (en) * | 2003-10-08 | 2005-05-19 | Giesecke & Devrient Gmbh | value document |
GB0525665D0 (en) * | 2005-12-16 | 2006-01-25 | Filtrona Plc | Detector and method of detection |
EP1814058B1 (en) * | 2006-01-26 | 2011-06-01 | Microscan Systems, Inc. | Method and device for measuring the change in the luminescence intensity of a phosphor |
EP1898365A1 (en) * | 2006-08-23 | 2008-03-12 | E.I. Dupont de Nemours and Company | Method and apparatus for verifying the authenticity of an item by detecting encoded luminescent security markers |
DE102006045626A1 (en) * | 2006-09-27 | 2008-04-03 | Giesecke & Devrient Gmbh | Device and method for the optical examination of value documents |
CN201311676Y (en) * | 2008-08-09 | 2009-09-16 | 深圳贝斯特机械电子有限公司 | RMB-banknote discriminating device |
-
2010
- 2010-04-14 DE DE102010014912A patent/DE102010014912A1/en not_active Withdrawn
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- 2011-04-12 MX MX2012010028A patent/MX2012010028A/en active IP Right Grant
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RU2549122C2 (en) | 2015-04-20 |
RU2012148171A (en) | 2014-05-20 |
CN102893309B (en) | 2016-08-24 |
EP2559010A1 (en) | 2013-02-20 |
ES2886756T3 (en) | 2021-12-20 |
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