WO2015045186A1 - 紙葉類真偽判定装置 - Google Patents
紙葉類真偽判定装置 Download PDFInfo
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- WO2015045186A1 WO2015045186A1 PCT/JP2013/076628 JP2013076628W WO2015045186A1 WO 2015045186 A1 WO2015045186 A1 WO 2015045186A1 JP 2013076628 W JP2013076628 W JP 2013076628W WO 2015045186 A1 WO2015045186 A1 WO 2015045186A1
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- Prior art keywords
- light
- paper sheet
- unit
- characteristic data
- emission characteristic
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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
- G07D7/005—Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
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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
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/121—Apparatus characterised by sensor details
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
Definitions
- the present invention relates to a paper sheet authenticity determination apparatus for determining the authenticity of a paper sheet to which a phosphor is added.
- a phosphor having a predetermined fluorescence emission characteristic is added to a predetermined position of a paper sheet, and the authenticity of the paper sheet is determined by detecting fluorescence emission according to the fluorescence emission characteristic of the phosphor.
- the technology to do is known.
- the wavelength of light that causes the phosphor to emit fluorescence hereinafter referred to as excitation light
- the characteristics of the spectrum of light emitted by irradiation of the excitation light are determined. That's it.
- Patent Document 1 discloses a fluorescent material that emits ultraviolet light when irradiated with ultraviolet light, and a fluorescent material that emits infrared light when irradiated with infrared light, and these materials are placed at predetermined positions.
- the document is verified by irradiating the document to be judged with ultraviolet light or infrared light, and confirming the presence or absence of fluorescence emission according to the fluorescent substance.
- Techniques for performing are disclosed.
- the technique according to Patent Document 1 is applied to the authenticity determination of paper sheets, the authenticity of the paper sheets is determined based on the presence or absence of fluorescent light emission of a phosphor that cannot be detected by the human eye. By detecting a difference that cannot be discriminated solely, it is possible to make a strict judgment on the authenticity of a paper sheet.
- Patent Document 1 discloses a paper sheet to which phosphors having substantially the same wavelength of excitation light and a peak wavelength of a fluorescence spectrum emitted by excitation light irradiation and having different half widths of the fluorescence spectrum are added. Differences cannot be determined only by existing technologies. There is also known a technique capable of determining a difference even with such paper sheets.
- Patent Document 2 discloses a predetermined method for paper sheets to which phosphors that emit light by irradiation with excitation light having the same wavelength and to which fluorescent substances having the same peak wavelength and different half widths of the fluorescence spectrum are added. Irradiate the excitation light of the wavelength to the paper sheet, measure the received light intensity near the peak wavelength of the fluorescence spectrum of the added phosphor and the received light intensity near the wavelength separated from the peak wavelength by a predetermined number, There is disclosed a technique capable of determining which phosphor is added to a paper sheet based on the magnitude of the difference in received light intensity with respect to two wavelengths.
- a true / false determination apparatus that uses a plurality of types of paper sheets to which phosphors having different fluorescence emission characteristics are added as targets for authenticity determination. Accordingly, a sensor that can irradiate a plurality of types of excitation light having different wavelengths and determine the characteristics of the fluorescence spectrum emitted by the plurality of types of phosphors is required.
- an apparatus called a fluorescence spectrophotometer capable of measuring the fluorescence emission characteristics of various phosphors is generally known.
- This fluorescence spectrophotometer is capable of irradiating phosphors with excitation light of all wavelengths within a predetermined range, and is information on the spectrum of light emitted by irradiating excitation light of each wavelength. It is an apparatus that can measure the emission intensity for each wavelength.
- the fluorescence spectrophotometer it is possible to measure fluorescence emission characteristic data of various phosphors. By using the measured fluorescence emission characteristic data, the trueness of the paper sheet to which the phosphor is added is measured. It is also possible to make a false determination.
- the fluorescence spectrophotometer is an extremely expensive device, and is inconvenient for determining the authenticity of paper sheets on which a part of the region has been printed with ink containing phosphor.
- the present invention is for solving the above-described problems of the prior art, and can easily perform true / false determination of a plurality of types of paper sheets to which phosphors having different fluorescence emission characteristics are added.
- An object of the present invention is to provide a paper sheet authenticity determination device.
- the present invention provides a paper sheet authenticity determination apparatus for determining the authenticity of a paper sheet to which a phosphor is added, and at least the paper sheet
- a plurality of types of filters that transmit only light in different wavelength bands of different predetermined ranges, and a plurality of light receivers that are provided corresponding to each of the plurality of types of filters and that receive the light transmitted by the filters
- fluorescence emission characteristic data for generating fluorescence emission characteristic data based on the received light intensity in the wavelength band of the predetermined range received by the plurality of light receivers when the excitation light of the wavelength selected from the excitation light source is irradiated
- the present invention is characterized in that the excitation light source, the plurality of types of filters, and the plurality of light receivers are all provided on one surface side of the paper sheet.
- the present invention is the above invention, wherein the excitation light source is provided on one side of the paper sheet, and the plurality of types of filters and the plurality of light receivers are provided on the other side of the paper sheet. It is characterized by being provided in.
- the present invention is the above invention, wherein the excitation light source selects one excitation light from a plurality of excitation lights having different wavelengths on the paper and irradiates the paper.
- the excitation light source selects one excitation light from a plurality of excitation lights having different wavelengths on the paper and irradiates the paper.
- Each of the light receivers receives the intensity of each light transmitted through the plurality of types of filters simultaneously or sequentially.
- the present invention is the above invention, wherein the excitation light source periodically irradiates sequentially excitation light of a plurality of wavelengths, and the plurality of light receivers periodically emit light of a plurality of wavelength bands for each wavelength band.
- the fluorescent light emission characteristic data generating unit sequentially receives light, and generates the fluorescent light emission characteristic data based on the received light intensity of the wavelength band received by the plurality of light receivers.
- the present invention is the above invention, wherein the fluorescence emission characteristic data generation unit includes a plurality of excitation light wavelength ranges to which wavelengths of the plurality of excitation lights respectively belong, and a reception wavelength band through which the plurality of types of filters respectively transmit.
- a matrix of excitation wavelengths and light reception wavelength bands, and a plurality of excitation lights having different wavelengths are sequentially irradiated to the paper sheets by the excitation light source, and each light receiving intensity of light transmitted by the plurality of types of filters is received. Is received by a corresponding light receiver, and the fluorescence emission characteristic data based on the received light intensity in each region of the matrix is generated, and the storage unit is further used for authenticity determination for each type of the paper sheet.
- An area of the matrix is stored, and the authenticity determination unit is specified for each type of paper sheet stored in the storage unit based on the result of the type determination unit. And performing authenticity discrimination using the fluorescence characteristics data of the use area of the box.
- the authenticity determination unit determines that light in the corresponding wavelength band is received when the light reception intensity of the light receiver is equal to or greater than a predetermined value, and the light reception intensity is less than the predetermined value. In this case, it is determined that no light in the corresponding wavelength band is received.
- the present invention further includes an optical image acquisition unit that acquires an optical image of the paper sheet, and the type determination unit is acquired by the optical image acquisition unit while conveying the paper sheet. Further, at least the type of the paper sheet is discriminated using image data of a predetermined area.
- the present invention is the above invention, wherein the plurality of light receivers measure received light intensity of the conveyed paper sheet, and the fluorescence emission characteristic data generation unit The fluorescence emission characteristic data is generated based on received light intensity measured by a plurality of light receivers.
- the present invention is the above invention, wherein the plurality of light receivers receive the received light intensity during irradiation with the excitation light from the excitation light source, and receive the received light intensity after the excitation light source is extinguished as phosphorescence intensity.
- the fluorescent light emission characteristic data generation unit further generates phosphorescent light emission characteristic data based on the phosphorescence intensity, and the storage unit preliminarily emits the phosphorescent light emission of a genuine paper sheet according to the type of the paper sheet. Characteristic data or a determination reference value obtained from the phosphorescence emission characteristic data is further stored, and the authenticity determination unit is configured to store the storage unit based on the type of the paper sheet determined by the type determination unit.
- the phosphorescence emission characteristic data on the phosphorescence of the genuine paper sheet stored in the memory, or both the phosphorescence emission characteristic data and the fluorescence emission characteristic data, and the phosphorescence emission characteristic data stored in the storage unit, Ku is used and both the phosphorescent property data and fluorescence emission characteristic data, and performs the determination of authenticity of the paper sheet.
- the present invention is the above invention, wherein the excitation light source emits a plurality of excitation lights having different wavelengths in the visible light region, and the plurality of types of filters emit light having different wavelengths in the infrared light region. It is characterized by transmitting.
- the present invention is the above invention, wherein the excitation light source emits a plurality of excitation lights having different wavelengths in the infrared light region, and the plurality of types of filters have light in a wavelength range different in the infrared light region. Is transmitted.
- the type of the paper sheet is determined, a plurality of excitation lights having different wavelengths are sequentially irradiated onto the paper sheet, and a plurality of different predetermined values for the light emitted by the phosphor added to the paper sheet is determined.
- Perform filtering to transmit light in a range of wavelengths receive light filtered at a plurality of different predetermined ranges of wavelengths, measure the received light intensity, and determine the wavelength of excitation light and the range of wavelengths transmitted by filtering
- Fluorescence emission characteristic data is generated based on the measured received light intensity, and the authenticity of the paper sheet using the threshold value obtained from the genuine fluorescence emission characteristic data of the paper sheet or the fluorescence emission characteristic data for the type of the paper sheet. Since it is configured to perform the false determination, the authenticity determination of a plurality of types of paper sheets to which phosphors having different fluorescence emission characteristics are added can be performed quickly and easily.
- FIG. 1 is an explanatory diagram for explaining the outline of the paper sheet authenticity determination device according to the first embodiment.
- FIG. 2 is an explanatory diagram for explaining the fluorescence emission characteristics of the phosphor added to the paper sheet in the first embodiment.
- FIG. 3 is a physical structure diagram for explaining a physical internal structure of the paper sheet authenticity determination apparatus shown in FIG.
- FIG. 4 is an internal structure diagram for explaining the internal structure of the reflective fluorescent sensor shown in FIG.
- FIG. 5 is an explanatory diagram for explaining the configuration of the light receiving section filter of the fluorescence sensor shown in FIG.
- FIG. 6 is a diagram for explaining the lighting timing of the light source of the fluorescent sensor shown in FIG. 4 and the measurement timing of the received light intensity by the light receiving unit.
- FIG. 1 is an explanatory diagram for explaining the outline of the paper sheet authenticity determination device according to the first embodiment.
- FIG. 2 is an explanatory diagram for explaining the fluorescence emission characteristics of the phosphor added to the paper sheet in the first embodiment.
- FIG. 3 is
- FIG. 7 is a functional block diagram for explaining a functional internal configuration according to the first embodiment of the paper sheet authenticity determination apparatus shown in FIG.
- FIG. 8 is a detailed functional block diagram for explaining a detailed functional configuration of the fluorescence sensor shown in FIG.
- FIG. 9 is an explanatory diagram for explaining the characteristics of the fluorescence sensor acquisition data acquired by the fluorescence sensor having the physical structure shown in FIG.
- FIG. 10 is a flowchart illustrating the processing procedure of the paper sheet authenticity determination process by the paper sheet authenticity determination apparatus illustrated in FIG. 1.
- FIG. 11 is an explanatory diagram for explaining the fluorescence emission characteristics of the phosphor added to the paper sheet in Example 2 and the characteristics of the light receiving unit of the fluorescence sensor.
- FIG. 12 is an internal structure diagram for explaining the structure of the transmission type fluorescent sensor used in the second embodiment.
- FIG. 13 is an explanatory diagram for explaining the afterglow characteristics of the light emission of the phosphor.
- FIG. 14 is a diagram for explaining the lighting timing of the light source unit of the fluorescent sensor shown in FIG. 12 and the measurement timing of the received light intensity by the light receiving unit.
- FIG. 15 is a functional block diagram for explaining a functional internal configuration according to the second embodiment of the paper sheet authenticity determination apparatus.
- FIG. 16 is a detailed functional block diagram for explaining a detailed functional configuration of the fluorescence sensor shown in FIG.
- FIG. 1A is a diagram illustrating an appearance configuration of a paper sheet authenticity determination device 10 and an example of a paper sheet that is a target of authenticity determination.
- FIG. 1B is a diagram showing an outline of the structure of the fluorescence sensor 14 that is inside the paper sheet authenticity determination device 10 and obtains the fluorescence emission characteristics of the paper sheet.
- FIG. 1C is an example of fluorescence emission characteristic data acquired by the fluorescence sensor 14 shown in FIG.
- the paper sheets that are subject to authenticity determination are printed with special ink containing a phosphor at a predetermined position.
- the authenticity of the paper sheet is determined by detecting the fluorescence emission characteristic of the phosphor.
- the paper sheet authenticity determination device 10 can place a paper sheet that is a target of authenticity determination on the front surface of the apparatus, and the authenticity of a paper sheet set on the mounting part 11.
- the accumulating unit 15 that performs the determination and conveys the genuine paper sheets and the reject unit 16 that conveys the non-authentic paper sheets are provided.
- the paper sheet authenticity determination device 10 is obtained by the fluorescence sensor 14 shown in FIG. 1B at a plurality of positions on the scanning line shown in FIG. 1A of the paper sheet set on the loading unit 11. Fluorescence emission characteristic data is generated from the acquired fluorescence sensor data, and authenticity is determined based on the measurement result.
- FIG. 1B is a diagram showing an outline of the structure of the fluorescence sensor 14 that measures the fluorescence emission characteristics of the paper sheet fed from the loading unit 11 inside the paper sheet authenticity determination device 10. is there.
- the fluorescence sensor 14 emits excitation light by light emitted from the first to fourth light source units 145a, 145b, 145c, and 145d with respect to the paper sheets conveyed on the paper sheet conveyance path sandwiched between the conveyance path guide plates.
- the emitted light intensity is measured by irradiating and receiving the fluorescence emitted from the paper sheet by the light receiving unit 142.
- the excitation light emitted from the first to fourth light source units 145a, 145b, 145c, and 145d is visible light, and the light emitted from the phosphor added to the paper is infrared light. .
- the first to fourth light source units 145a, 145b, 145c, and 145d are four types of light emitting diodes that can emit visible light having different wavelengths.
- the fluorescence sensor 14 sequentially turns on the four types of light emitting diodes of the first to fourth light source units 145a, 145b, 145c, and 145d, and receives the reaction of the sheet phosphor with respect to the excitation light having different wavelengths. Detect at 142.
- the first to fourth light source units 145a, 145b, 145c, and 145d will be described as examples that can emit four types of excitation light having wavelengths of A, B, C, and D, respectively.
- the light receiving unit 142 receives infrared light, which is light emitted from the phosphor, and detects the intensity of the infrared light.
- a light source unit filter 144 exists between the first to fourth light source units 145a, 145b, 145c, and 145d and the paper sheets.
- the light source unit filter 144 is a filter that cuts infrared light components of excitation light emitted from the first to fourth light source units 145a, 145b, 145c, and 145d.
- the light receiving unit 142 receives only the infrared light emitted from the phosphor.
- the light receiving unit 142 is a four-divided photodiode in which four photodiodes are arranged in a square shape on one substrate, and has four independent light receiving units.
- a light receiving unit filter 143 exists between the light receiving unit 142 and the paper sheet, and the light receiving unit filter 143 is a band pass filter that transmits different wavelength ranges of infrared light for each of the four light receiving units. Accordingly, the four light receiving units of the light receiving unit 142 can receive the light for each band filtered by the light receiving unit filter 143, and the intensity of each infrared band component of the fluorescence emitted from the paper sheet. Can be detected. In the first embodiment, an example is shown in which three of the four-division photodiodes of the light receiving unit 142 are used for detection of fluorescence emission characteristics.
- the three light receiving sections detect the received light intensity having a wavelength of ⁇ 1 to less than ⁇ 2, the received light intensity having a wavelength of ⁇ 2 to ⁇ 3, and the received light intensity having a wavelength of ⁇ 3 to ⁇ 4.
- FIG. 1C is an example in which the fluorescence sensor 14 shown in FIG. 1B has acquired fluorescence emission characteristic data on the scanning line of the paper sheet of the authenticity determination target shown in FIG. is there.
- the phosphor contained in the ink printed with the fluorescence pattern on the authenticity-determined paper sheet shown in FIG. 1 (a) has a wavelength of ⁇ 3 or more and less than ⁇ 4 when irradiated with excitation light having a wavelength of A. It has fluorescence emission characteristics that emit light.
- the vertical axis represents the intensity of the received light detected by the light receiving unit 142
- the horizontal axis represents the right and left of the paper sheet on the scanning line of the paper sheet that is the authenticity determination target.
- the phosphor contained in the ink printed with the fluorescent pattern emits light with a wavelength of ⁇ 3 or more and less than ⁇ 4 when irradiated with the excitation light having a wavelength of A. Therefore, the influence of light emission by the phosphor contained in the fluorescent pattern is shown in FIG. Appears only in the upper right graph of c). Further, the fact that three peaks appear in the upper right graph of FIG. 1 (c) reflects the position and shape of the fluorescent pattern of FIG. 1 (a).
- the paper sheet authenticity determination device 10 stores in advance the fluorescence emission characteristic data shown in FIG. 1C corresponding to an authentic paper sheet, and FIG. 1 corresponding to the authenticity determination target paper sheet.
- the authenticity determination of the authenticity determination target paper sheet is performed by acquiring the fluorescence emission characteristic data shown in (c) and evaluating the similarity. 1C, when irradiated with excitation light having a wavelength of A, B, C, or D, the paper sheet for authenticity determination emits light with the excitation light of wavelength A, and the emitted light is ⁇ 1 or more.
- a phosphor having a fluorescence emission characteristic such that the wavelength is less than ⁇ 4 is added.
- the paper sheet authenticity determination apparatus 10 stores in advance the fluorescence emission characteristic data shown in FIG.
- the type and direction of the paper sheet are determined from the image image at the time of infrared light irradiation, the fluorescence emission characteristic data of the authentic paper sheet corresponding to the determined type and direction of the paper sheet, and the authenticity determination target
- the correlation coefficient is used to evaluate the similarity to the fluorescence emission characteristic data of genuine paper sheets, and the threshold value is set from the cumulative value obtained by integrating the predetermined interval. Then, it may be determined that there is a predetermined fluorescence emission if the threshold value is greater.
- the type of the paper sheet is distinguished by characteristics other than the fluorescence emission characteristics, and the excitation light having different wavelengths is irradiated to the paper sheet in order, and the intensity of the emitted light of the phosphor added to the paper sheet is predetermined.
- the fluorescence emission characteristic data obtained as a result of the measurement for each wavelength in the range of the comparison with the fluorescence emission characteristic data of the genuine paper sheet stored in advance for each kind of paper sheet and the conveyance (scanning) direction. Since the authenticity of the paper sheet is determined by performing the evaluation, it is possible to easily perform the authenticity determination of a plurality of types of paper sheets to which phosphors having different fluorescence emission characteristics are added.
- FIG. 2A is a diagram for explaining a block for discriminating a phosphor added to a paper sheet that is a target of authenticity determination in the first embodiment.
- FIG. 2B is a diagram for explaining the characteristics of a general emission spectrum of a phosphor that emits light in the near-infrared light region.
- the phosphor emits fluorescence with excitation light having a predetermined wavelength for each type of phosphor, and emits fluorescence having spectral characteristics according to the type of phosphor.
- a paper sheet to which a fluorescent material that emits infrared light having a wavelength of 780 nm or more is added with visible light having a wavelength in the range of 380 nm to 780 nm as excitation light is used as a paper sheet that is subject to authenticity determination.
- phosphors containing rare earth include phosphors having fluorescence emission characteristics such that specific wavelength ranges emit light strongly.
- Er Gd 2 O 2 S Er: NaYW 2 O 6 Yb, Er: CaF 2 Etc.
- These substances are known to emit fluorescence having a wavelength of about 1100 nm with excitation light having a wavelength of about 550 nm.
- FIG. 2A defines a block indicating the relationship between the wavelength of the excitation light and the emission wavelength of the phosphor received by the light receiving unit 142 of the fluorescence sensor.
- the wavelength of the excitation light is divided into a range of 380 nm to 780 nm into four regions, and the paper sheets can be irradiated with four types of excitation light having spectral peaks in each region. Yes.
- the peak wavelengths of the four types of excitation light spectra are denoted as A, B, C, and D, respectively.
- the light receiving unit 142 that receives the fluorescence emitted by each irradiation of the excitation light includes the band 1 in the wavelength range of ⁇ 1 to ⁇ 2, the band 2 in the wavelength range of ⁇ 2 to ⁇ 3, or It is possible to measure the light intensity of each band 3 in the wavelength range of ⁇ 3 or more and less than ⁇ 4.
- the block is divided into 12 blocks A1 to A3, B1 to B3, C1 to C3, and D1 to D3.
- A1 is a band 1 block in which the peak wavelength of the spectrum of the excitation light is A and the wavelength of the fluorescence emission is in the range of ⁇ 1 to less than ⁇ 2.
- A2 is a block of band 2 in which the peak wavelength of the spectrum of the excitation light is A and the wavelength is in the range of ⁇ 2 to ⁇ 3.
- A3 is a band 3 block in which the peak wavelength of the spectrum of the excitation light is A and the wavelength is in the range of ⁇ 3 or more and less than ⁇ 4.
- B1 to B3 are blocks in which the peak wavelength of the excitation light spectrum is B
- C1 to C3 are blocks in which the peak wavelength of the excitation light spectrum is C
- D1 to D3 are peak wavelengths in the excitation light spectrum of D. It is a block.
- block A1 to A3, B1 to B3, C1 to C3, or D1 to D3 emits fluorescence.
- the authenticity determination of the paper sheet of the first embodiment is performed using this, and if the paper sheet is a paper sheet with a predetermined phosphor added at a predetermined position, the paper sheet is at a predetermined position.
- the correct paper sheet is determined by detecting the presence or absence of light emission for each block in accordance with the phosphor added to the genuine paper sheet.
- FIG. 2B shows an example of a typical fluorescence emission spectrum of a phosphor containing rare earth and emitting fluorescence in the near infrared wavelength range.
- FIG. 2B is an example of fluorescence spectra of phosphor 1, phosphor 2 and phosphor 3 having different fluorescence emission characteristics.
- Fluorescent materials having a fluorescent peak wavelength in the infrared light range are often characterized by a sharp peak in the waveform of the spectrum, as shown in the spectrum waveforms of the phosphor 2 and the phosphor 3. In the case of phosphor 2, fluorescence emission is detected in band 2, and in the case of phosphor 3, fluorescence emission is detected in band 3.
- the peak wavelength of the fluorescence spectrum is often in the visible light range.
- the emission intensity at the peak wavelength is strong and the spectrum is broad and the range of band 1 is large.
- fluorescence emission can be detected.
- the peak wavelength of the fluorescence spectrum of the phosphor 1 is in the visible light range, but in the band 1 in the infrared light range. Fluorescence emission can be detected.
- FIG. 3A is a cross-sectional view of the paper sheet authenticity determination device 10
- FIG. 3B is an example of paper sheet identification and authenticity determination in the transport unit 12 of the paper sheet authenticity determination device 10. It is a figure which shows arrangement
- the paper sheet authenticity determination apparatus 10 includes a placement unit 11 on which a plurality of paper sheets P to be identified and counted are placed in a stacked state, Out of the stacked paper sheets P placed on the section 11, the lowermost paper sheet P is fed into the housing one by one, and the feeding unit 51 feeds the paper P into the housing. And a transport unit 12 for transporting the sheets P one by one.
- the transport unit 12 is provided with an identification counting unit 52 including the fluorescent sensor 14 according to the present embodiment and other sensors.
- the identification counting unit 52 is an identification processing unit that performs identification, authenticity determination, and counting of the paper sheet P fed from the placement unit 11 into the housing using the fluorescent sensor 14 and other sensors. The configuration of the identification counting unit 52 will be described later with reference to FIG.
- the feeding unit 51 includes a kicker roller 51a that abuts on the surface of the lowermost paper sheet P among the plurality of paper sheets P placed in a stacked state on the placement unit 11, and a feeding direction of the paper sheet P.
- the feed roller 51b is disposed downstream of the kicker roller 51a and feeds the paper sheet P fed by the kicker roller 51a into the housing.
- a gate roller (reverse roller) 51c is provided to face the feed roller 51b, and a gate portion is formed between the feed roller 51b and the gate roller 51c.
- the paper sheets P fed by the kicker roller 51a pass through the gate part and are fed out one by one to the transport part 12 in the housing.
- the paper sheet fed to the transport unit 12 is transported to the identification counting unit 52, and the identification counting unit 52 acquires image data and fluorescent light emission data of the transported paper sheet.
- the transport unit 12 is branched into two transport paths at a location downstream of the identification counting unit 52, and the stacking unit 15 is connected to one transport path.
- the reject unit 16 is connected to the other conveyance path.
- An opening is provided in the front surface of the stacking unit 15 (the right side surface in FIG. 3A) so that the operator can take out the paper sheets P stacked in the stacking unit 15 through the opening. It has become.
- An opening is also provided on the front surface of the reject unit 16, and the operator can take out the paper sheets P 'accumulated in the reject unit 16 through the opening.
- a branching portion 53 consisting of a branching member and its driving portion (not shown) is provided at a location where the transporting portion 12 branches into two transport paths.
- the branching unit 53 selectively feeds the paper sheet P sent from the upstream side of the branching unit 53 to one of the two transported paths.
- the stacking unit 15 has an impeller-type stacking mechanism 55 at a position on the back side of the housing (a position on the left side of the stacking unit 15 in FIG. 3A).
- the impeller type accumulation mechanism 55 includes an impeller 55a and a driving unit (not shown).
- the impeller 55a is centered on an axis extending in a substantially horizontal direction perpendicular to the paper surface of FIG. It rotates in the clockwise direction in FIG. 3A (the arrow direction in FIG. 3A).
- the impeller 55a is provided with a plurality of blades 55b extending outward from the outer peripheral surface in the direction opposite to the rotational direction (counterclockwise direction in FIG. 3A). These blades 55b are provided at equal intervals on the outer peripheral surface of the impeller 55a as shown in FIG.
- the impeller 55a of the impeller accumulation mechanism 55 is always rotated clockwise in FIG. 3A by the drive unit during the operation of the paper sheet authenticity determination device 10, and this impeller 55a.
- the sheet P is fed one by one from the transport unit 12.
- the impeller 55a receives the paper sheet P sent from the transport unit 12 between the two blades 55b and sends the paper sheet P received between the blades 55b to the stacking unit 15. ing. In this way, the sheets P are sent one by one from the impeller 55a to the stacking unit 15, and a plurality of sheets P are stacked in the stacking unit 15.
- the paper sheet authenticity determination device 10 is provided with a shutter 56 for closing an opening provided on the front surface of the stacking unit 15.
- the shutter 56 selectively closes the opening on the front surface of the stacking unit 15. It has come to be.
- the shutter 56 is closed by the shutter drive unit (not shown) for driving the shutter 56, retracted from the front opening of the stacking unit 15 to open the opening, and the front opening of the stacking unit 15. It is made to move between the closed positions. That is, when the shutter 56 is in the opening position, the shutter 56 is retracted from the opening on the front surface of the stacking unit 15 and the opening is opened, and the operator accesses the paper sheets P stacked in the stacking unit 15. Will be able to.
- the shutter 56 when the shutter 56 is in the closed position, the opening on the front surface of the stacking unit 15 is closed by the shutter 56, and the operator cannot access the paper sheets P stacked in the stacking unit 15.
- the shutter 56 when in the open position is indicated by a solid line
- the shutter 56 when in the closed position is indicated by a two-dot chain line.
- the paper sheet authenticity determination device 10 is provided with various sensors.
- the placement unit 11 is a resting paper sheet detection sensor that includes a reflective optical sensor for detecting whether or not the paper sheet P remains on the placement unit 11. 61 is provided.
- a branch timing sensor 63 including an optical sensor is provided on the upstream side of the branch unit 53 in the transport unit 12. The branching member of the branching unit 53 moves to either the position where the paper sheet P is sent to the stacking unit 15 or the position where it is sent to the rejecting unit 16 at the timing when the paper sheet P is detected by the branching timing sensor 63. Will be.
- the transport path on the stacking section 15 side is a paper sheet composed of an optical sensor that detects the paper sheet P sent to the transport path.
- An analog passage detection sensor 64 is provided. The paper sheet passage detection sensor 64 detects that the paper sheet P has been sent to the conveyance path on the stacking unit 15 side by the branching unit 53.
- the stacking unit 15 is provided with a stacking unit paper sheet detection sensor 65 including an optical sensor for detecting whether or not the paper sheet P is stacked on the stacking unit 15.
- the reject unit 16 is provided with a reject unit paper sheet detection sensor 66 including an optical sensor for detecting whether or not the paper sheet P ′ is accumulated in the reject unit 16.
- a display operation unit 54 is provided on the front surface of the casing of the paper sheet authenticity determination device 10.
- the display operation unit 54 is an input / output unit that accepts information display and operator input. Specifically, the display operation unit 54 displays information such as the number of sheets P for each denomination and the total amount counted by the identification counting unit 52. In addition, the display operation unit 54 receives an operator instruction for processing.
- FIG. 3B shows a configuration of the identification counting unit 52 of FIG.
- the identification counting unit 52 includes paper sheet passage detection sensors 62a and 62b that detect passage of paper sheets, line sensor 13, paper sheet passage detection sensors 62c and 62d, and fluorescence sensor 14 in the order of paper sheet conveyance. And paper sheet passage detection sensors 62e and 62f are provided.
- the reading of the line sensor 13 is started, and the trailing edge of the paper sheet is detected by the paper sheet passage detection sensors 62c and 62d.
- reading of the line sensor 13 is stopped.
- reading of the fluorescence sensor 14 is started, and the trailing edge of the paper sheet by the paper sheet passage detection sensors 62e and 62f is started. In response to this detection, reading of the fluorescence sensor 14 is stopped.
- the line sensor 13 acquires an image of an area that covers the width of the paper sheet.
- the fluorescent sensor 14 is arranged at a position for scanning a predetermined scanning line of the paper sheet. In the example of FIG. 3B, two fluorescent sensors 14 are provided, and the fluorescent emission characteristics on two scanning lines of the paper sheet can be acquired. A large number of fluorescent sensors 14 can also be arranged in an array.
- FIG. 4A is a view of the structure of the light source unit 145 that is a light source of excitation light of the fluorescence sensor 14 and the light receiving unit 142 that detects the fluorescence emission of the paper sheet as viewed from the direction of the paper sheet conveyance path.
- FIG. 4B is a cross-sectional view of the reflective fluorescent sensor 14 taken along a vertical plane parallel to the paper sheet conveyance direction.
- the light source unit 145 is a light emitting diode that emits excitation light having four different wavelengths.
- the first light source unit 145a emits excitation light of wavelength A
- the second light source unit 145b emits excitation light of wavelength B
- the third light source unit 145c emits excitation light of wavelength C
- the fourth light source unit 145d Emits excitation light of wavelength D.
- the light receiving unit 142 is a four-divided photodiode, and can measure the intensity of light received by the four photodiodes independently.
- the four photodiodes are filtered by the light receiving unit filter 143 shown in FIG. 4B so that each photodiode receives light in a different wavelength band, so that each photodiode has light in a different wavelength band. Can be measured.
- the first light receiving unit 142a measures the intensity of light in the band 1 wavelength band with a wavelength of ⁇ 1 or more and less than ⁇ 2, and the second light receiving unit 142b measures the intensity of light in the wavelength band of band 2 with a wavelength of ⁇ 2 or more and less than ⁇ 3.
- the third light receiving unit 142c measures the intensity of light in the wavelength band of band 3 having a wavelength of ⁇ 3 or more and less than ⁇ 4, and the fourth light receiving unit 142d measures the intensity of the received light without performing filtering by wavelength.
- the fluorescence sensor 14 is installed on the upper side of the paper sheet transport path sandwiched between the upper transport plate and the lower transport plate, and the light source unit 145 and the light receiving unit 142 are placed on the paper sheet transport path. On the same side.
- the excitation light is emitted from the light source unit 145, the light reflected from the paper sheet and the fluorescence emitted from the phosphor added to the paper sheet are irradiated through the light source unit filter 144 to the authenticity determination target paper sheet.
- the light receiving unit filter 143 performs filtering, and the light receiving unit 142 detects the intensity of light received for each band.
- the light source unit filter 144 is an infrared light cut filter, and prevents the infrared light component of the light emitted from the light source unit 145 from being received by the light receiving unit 142 by cutting the infrared light component of the light source. belongs to. As a result, the light receiving unit 142 can detect only infrared light generated by fluorescence.
- a light quantity monitoring test medium is disposed under the glass window on the lower conveyance path guide plate directly below the fluorescent sensor 14. This is used for automatic maintenance processing when paper sheets are not processed.
- the light source unit 145 emits light with no paper sheet on the conveyance path, and the light amount monitor test medium below the conveyance path is irradiated, and the reflected light is applied to the light receiving unit filter 143. The light is received by the fourth light receiving portion 142d that is not present.
- the light-emitting diodes of the four light sources When the light-emitting diodes of the four light sources are turned on in order and the intensity of light received by the fourth light-receiving unit 142d is measured, and compared with the intensity of light at normal time, the light-receiving intensity of light is less than a predetermined threshold Is determined to be a failure. In addition, if the intensity of the four light sources exceeds the failure judgment threshold, but there is a difference from the original light intensity, the excitation light intensity can be adjusted by adjusting the current flowing through the light emitting diode. Make it possible to do.
- the light receiving unit 142 has four light receiving units, a first light receiving unit 142a, a second light receiving unit 142b, a third light receiving unit 142c, and a fourth light receiving unit 142d.
- the light receiving unit 142 is overlaid with a light receiving unit filter 143 including three filters, a first light receiving unit filter 143a, a second light receiving unit filter 143b, and a third light receiving unit filter 143c.
- the first light receiving unit filter 143a is overlaid on the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c
- the second light receiving unit filter 143b is the second light receiving unit.
- the third light receiving portion filter 143c is overlapped with the third light receiving portion 142c.
- the fourth light receiving unit 142d does not overlap any filter, it receives light of all wavelengths including visible light.
- the first light receiving unit filter 143a transmits light having a wavelength of ⁇ 1 or more
- the second light receiving unit filter 143b transmits light having a wavelength of ⁇ 2 or more
- the filter 143c transmits light having a wavelength of ⁇ 3 or more.
- the material of the photodiode of the light receiving unit 142 used in the first embodiment is silicon, and the wavelength of the detection limit by the photodiode using silicon is approximately 1100 nm. Therefore, ⁇ 4 is set to 1100 nm.
- the intensity received by the first light receiving unit 142a is Va
- the intensity received by the second light receiving unit 142b is Vb
- the intensity received by the third light receiving unit 142c is Vc
- the intensity of the light of the wavelength of band 1 is Calculated by (Va ⁇ Vb)
- the intensity of light of the wavelength of band 2 is calculated by (Vb ⁇ Vc)
- the intensity of light of the wavelength of band 3 is Vc.
- the first light source unit 145a having the wavelength A starts to emit light at time t1 and turns off at time t4, and the second light source unit 145b having the wavelength B starts to emit light at time t5 and turns off at time t8.
- the third light source unit 145c of C starts to emit light at time t9 and turns off at time t12
- the fourth light source unit 145d of wavelength D starts to emit light at time t13 and turns off at time t16.
- the light receiving unit 142 acquires the intensity of light received by the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c, respectively, at the timing when each light source emits light.
- light reception by the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c is performed between the time t2 and the time t3 between the time t1 and the time t4 when the first light source unit 145a emits light. Get the intensity of the light. Further, the light received by the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c between the time t6 and the time t7 between the time t5 and the time t8 during which the second light source unit 145b emits light. Get strength.
- the light received by the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c between the time t10 and the time t11 between the time t9 and the time t12 during which the third light source unit 145c emits light. Get strength. Further, the light received by the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c between the time t14 and the time t15 between the time t13 and the time t16 during which the fourth light source unit 145d emits light. Get strength.
- the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c may receive light sequentially when the light source unit 145 is irradiated with the wavelength A of the excitation light. Can be read in parallel at the same time.
- An amplifier circuit (not shown) and an AD converter for digital conversion are provided at the subsequent stage of the light receiving unit 142.
- the paper sheet authenticity determination device 10 collects an image of a paper sheet, a placement unit 11 that sets a paper sheet that is a target of authenticity determination, a transport unit 12 that transports the paper sheet, and the like.
- Line sensor 13 fluorescent sensor 14 for detecting the fluorescence emission characteristics of paper sheets on the scanning line
- stacking unit 15 for storing paper sheets determined to be authentic paper sheets, and not authentic paper sheets
- a reject unit 16, a storage unit 17, and a control unit 18, which are outlets for discharging the determined paper sheets, are provided.
- the storage unit 17 is a storage device composed of a hard disk device, a nonvolatile memory, or the like.
- the storage unit 17 stores a paper sheet database 17a, fluorescence sensor acquisition data 17b, time axis adjusted data 17c, pre-level correction data 17d, post-level correction data 17e, band-specific data 17f, and fluorescence emission characteristic data 17g.
- the paper sheet database 17a is associated with the paper sheet identification code obtained as a result of identifying the paper sheet, and the image feature data generated from the image data of the authentic paper sheet in advance and the authentic paper sheet in advance. And fluorescence emission characteristic data generated from information obtained from the above.
- the paper sheet identification code includes at least a type and a conveyance direction.
- the channel numbers and excitation wavelengths (A to 145) of the light source units (145a to 145d) are assigned.
- an example in which a plurality of data corresponding to each sampling point is used as the fluorescence emission characteristic data of the genuine paper sheet to be stored is not limited to this. It may be a statistical value such as an integral value, an average value, or a normalized value thereof.
- the fluorescence sensor acquisition data 17b is obtained by the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c for each wavelength of the excitation light at every time or predetermined distance at which the point data on the scanning line is acquired. This data stores the intensity of received light.
- the first to fourth light receiving portions 142a to 142d measure the light intensity using photodiodes physically different in position depending on the wavelength band of light received.
- a difference in physical position of the light receiving unit with respect to the paper sheet conveyance direction is a time lag in acquiring data at the same point.
- the time axis adjusted data 17c is data obtained by correcting a time lag with respect to the fluorescence sensor acquisition data 17b.
- the data 17d before level correction is subtracted from the data 17c after time axis adjustment corresponding to the offset signal of the operational amplifier of the photodiode included therein, and the minimum value of the signal of each photodiode is set to zero. This is the corrected data.
- the post-level correction data 17e includes four light sources (first light source unit 145a, second light source unit 145b, third light source unit 145c, and fourth light source unit 145d) and three light receiving units with respect to the data 17d before level correction. This is data calculated by multiplying a predetermined count for correcting a detection sensitivity difference caused by a physical positional relationship between the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c.
- the post-level correction data 17e performs time axis correction and correction of the intensity of light received by the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c with respect to the fluorescence sensor acquisition data 17b.
- the intensity of the light received by the first light receiving unit 142a is the intensity of the light of band 1, band 2 and band 3
- the intensity of the light received by the second light receiving unit 142b is corrected.
- the intensity is the intensity of the light of band 2 and band 3
- the intensity of the light received by the third light receiving unit 142c is the intensity of the light of band 3.
- the band-specific data 17f is based on the level-corrected data 17e, the intensity received by the first light receiving unit 142a as Va, the intensity received by the second light receiving unit 142b as Vb, and the intensity received by the third light receiving unit 142c.
- Vc the intensity of light of the band 1 wavelength is calculated by (Va ⁇ Vb), and the intensity of light of the band 2 wavelength is calculated by (Vb ⁇ Vc). It is the calculated data.
- the fluorescence emission characteristic data 17g includes data near the maximum value before normalization in order to correct the level difference of the detection signal due to the contamination of the paper sheet and the front and back of the paper sheet with respect to the band-specific data 17f. This data is normalized by the maximum value on condition that it falls within a predetermined range. Further, the fluorescence emission characteristic data of the genuine paper sheets included in the paper sheet database 17a has the same data format as the fluorescence emission characteristic data 17g, and the similarity to the fluorescence emission characteristic data 17g is evaluated. Check the authenticity of paper sheets.
- the control unit 18 is a control unit that controls the entire sheet authenticity determination device 10, and includes a conveyance control unit 18a, a sheet type determination unit 18b, a fluorescence sensor data acquisition unit 18c, and a fluorescence emission characteristic data generation unit 18d. And a true / false determination unit 18e.
- the programs corresponding to these functional units are stored in a ROM or non-volatile memory (not shown), and these programs are loaded into a CPU (Central Processing Unit) and executed to execute the corresponding processes. Will be executed.
- the conveyance control unit 18a controls the conveyance unit 12 to identify the paper sheets placed on the placement unit 11 fed out by the feeding unit 51, and the identification counting unit 52 in which the line sensor 13 and the fluorescence sensor 14 are arranged. To the position.
- the conveyance control unit 18a controls the branching unit 53 based on the result of the paper sheet authenticity determination, conveys the paper sheet determined to be authentic to the stacking unit 15, and determines that it is not authentic. The paper sheets thus conveyed are conveyed to the reject unit 16.
- the paper sheet type determination unit 18b acquires the image data of the paper sheet conveyed to the identification counting unit 52 with the line sensor 13, generates image feature data from the acquired image data, and stores the paper sheet database 17a.
- the type of the paper sheet is determined by specifying the paper sheet identification code by evaluating the similarity with the feature data of the image of the paper sheet registered in the above.
- the fluorescence sensor data acquisition unit 18c acquires the data related to the fluorescence emission of the paper sheet conveyed to the identification counting unit 52 by controlling the fluorescence sensor 14, and stores the acquired data as the fluorescence sensor acquisition data 17b. Based on the fluorescence sensor acquisition data 17b acquired by the fluorescence sensor data acquisition unit 18c, the fluorescence emission characteristic data generation unit 18d performs the time axis adjusted data 17c, the level correction data 17d, the level correction data 17e, and the band-specific data. Data 17f and fluorescence emission characteristic data 17g are generated in order.
- the authenticity determination unit 18e evaluates the similarity between the fluorescence emission characteristic data 17g generated by the fluorescence emission characteristic data generation unit 18d and the fluorescence emission characteristic data of the authentic paper sheets included in the paper sheet database 17a.
- the paper sheet is checked for authenticity by The similarity is determined using a generally known similarity determination method such as the absolute sum of the difference values of each corresponding point of both fluorescent emission characteristics data, the correlation value, and a predetermined threshold value. Is done.
- the fluorescent sensor 14 includes an Amp substrate 141, a light receiving unit 142, a light receiving unit filter 143, a light source unit filter 144, a light source unit 145, an LED control board 146, and a fluorescent sensor control unit 147.
- the Amp substrate 141 amplifies the received light intensity signal received by the light receiving unit 142.
- the light receiving unit 142 is a quadrant photodiode having a detection wavelength range of about 190 nm to 1100 nm made of silicon, and includes a first light receiving unit 142a, a second light receiving unit 142b, a third light receiving unit 142c, and a fourth light receiving unit 142d. Have.
- the light receiving unit filter 143 is a bandpass filter that transmits light of different wavelength bands to the four light receiving units of the light receiving unit 142.
- the first light receiving unit filter 143a transmits light having a wavelength of ⁇ 1 or more
- the second light receiving unit filter 143b transmits light having a wavelength of ⁇ 2 or more
- the third light receiving unit filter 143c is light having a wavelength of ⁇ 3 or more. Transparent.
- the first light receiving unit filter 143a filters light entering the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c
- the second light receiving unit filter 143b includes the second light receiving unit 142b and the third light receiving unit 142b.
- the light entering the light receiving unit 142c is filtered
- the third light receiving unit filter 143c is configured to filter the light entering the third light receiving unit 142c.
- the first light receiving unit 142a detects the intensity of light having a wavelength of ⁇ 1 or more
- the second light receiving unit 142b detects the intensity of light having a wavelength of ⁇ 2 or more
- the third light receiving unit 142c detects the intensity of light having a wavelength of ⁇ 3 or more. It will be. Further, since no filter is applied to the fourth light receiving unit 142d, the intensity of light including all wavelengths is detected.
- the light source unit filter 144 is an infrared light cut filter that transmits only light having a wavelength of 650 nm or less.
- the light source unit 145 includes four light emitting diodes, and each light emitting diode emits visible light having a different wavelength.
- the first light source unit 145a emits visible light having a wavelength A
- the second light source unit 145b emits visible light having a wavelength B
- the third light source unit 145c emits visible light having a wavelength C
- the fourth The light source unit 145d emits visible light having a wavelength D.
- the LED control board 146 controls the light emission intensity of the light emitting diode of the light source unit 145.
- the fluorescence sensor control unit 147 performs the light emission timings of the first light source unit 145a, the second light source unit 145b, the third light source unit 145c, and the fourth light source unit 145d illustrated in FIG. Control.
- the fluorescence sensor 14 transmits data relating to fluorescence of a paper sheet on which a fluorescent pattern is printed as shown in FIG. A part of the fluorescence sensor acquisition data 17b in the case of acquisition is shown.
- the graph shown in the data acquired by the fluorescence sensor 14 of FIG. 9 shows the time of scanning the scanning lines of the first light receiving unit 142a and the second light receiving unit 142b when the excitation light of wavelength A is irradiated and the detected light intensity. It is the figure which showed the relationship.
- the fluorescent substance that emits fluorescence in band 2 Since the fluorescent substance that emits fluorescence in band 2 is used, it is ideal that the same data is acquired for the first light receiving unit 142a and the second light receiving unit 142b.
- the first light receiving unit 142a and the second light receiving unit 142b have a difference of ⁇ d in physical positions with respect to the transport direction.
- the waveform drawn by the data acquired by the first light receiving unit 142a located upstream in the banknote transport direction is similar to the waveform drawn by the data acquired by the second light receiving unit 142b located downstream, but appears.
- the timing is delayed by ⁇ t time.
- the time axis adjusted data 17c is a time resulting from a difference in physical position of the first light receiving unit 142a, the second light receiving unit 142b, and the third light receiving unit 142c with respect to the paper sheet conveyance direction. This is data obtained by correcting the time of the fluorescence sensor acquisition data 17b including the deviation.
- the time correction between the first light receiving unit 142a and the second light receiving unit 142b has been described.
- the time correction between the first light receiving unit 142a and the third light receiving unit 142c is also necessary. It is.
- Such time correction generates the band-specific data 17f by calculation using the detection value of the first light receiving unit 142a, the detection value of the second light receiving unit 142b, and the detection value of the third light receiving unit 142c of the same time. Therefore, in order to generate the band-specific data 17f, it is necessary to correct the time lag in advance.
- the paper sheet type determination unit 18b uses the line sensor 13 to start collecting an image of the paper sheet fed from the placement unit 11 to the transport unit 12 (step S101).
- the fluorescence sensor data acquisition unit 18c acquires fluorescence sensor data using the fluorescence sensor 14 in parallel with the image collection processing by the paper sheet type determination unit 18b, and uses the acquired data as fluorescence sensor acquisition data 17b. Store (step S102).
- the paper sheet type determination unit 18b generates image feature data from the collected image data when the paper sheet image data collection process is completed, and the paper sheets registered in the paper sheet database 17a.
- the type of the paper sheet is discriminated by evaluating the similarity with the image feature data and searching for the paper sheet having the similarity satisfying a predetermined criterion (step S103).
- step S104 When the feature data generated from the image data does not satisfy a predetermined standard for the similarity of any image feature data of the paper sheets registered in the paper sheet database 17a (step S104; No), Since the type of the paper sheet cannot be determined, it is determined that the paper sheet is not a target paper sheet for which the authenticity determination is performed by the apparatus, and the inserted paper sheet is conveyed to the reject unit 16 (Step S1). S114), the process is terminated.
- step S104 When the feature data generated from the image data satisfies a predetermined criterion (step S104; Yes), the degree of similarity between the image feature data of any of the paper sheets registered in the paper sheet database 17a is satisfied.
- the type of the inserted paper sheet is determined to be a paper sheet registered in the paper sheet database 17a whose similarity satisfies a predetermined criterion, and the fluorescence emission characteristic data generation unit 18d acquires the fluorescence sensor acquisition data.
- the time axis is corrected for 17b, and the corrected data is stored as time axis adjusted data 17c (step S105).
- the fluorescence emission characteristic data generation unit 18d subtracts the amount corresponding to the offset voltage of the amplifier circuit that amplifies the photodiode signal included in the time axis adjusted data 17c, and further subtracts each photodiode. Correction is performed so that the minimum value of the signal becomes zero, and the result is stored as level pre-correction data 17d (step S106).
- the fluorescence emission characteristic data generation unit 18d includes four light sources (first light source unit 145a, second light source unit 145b, third light source unit 145c, and fourth light source unit 145d) and three light receiving units (first light receiving unit).
- the fluorescence emission characteristic data generation unit 18d calculates the band-specific data 17f from the level-corrected data 17e (step 108), and the paper sheet stains contained in the band-specific data 17f and the difference between the front and back of the paper sheets are determined. In order to correct the level difference of the detection signal due to the above, normalization is performed with the maximum value, and the result is stored as fluorescence emission characteristic data 17g (step S109).
- the authenticity determination unit 18e extracts the determination criterion data of the fluorescence emission characteristic data at the specific position corresponding to the type of the paper sheet determined in step S103 from the paper sheet database 17a (step S110), and normalizes in step S109.
- the similarity in a specific area with the fluorescence emission characteristic data 17g of the paper sheet thus determined is determined (step S111).
- This similarity determination method may be changed depending on the required strictness and the number of types of paper sheets to be determined. For example, when strictness is required or when there are many types of papers to be subjected to authenticity determination, the block is determined by the band indicating the range of the excitation light wavelength and the fluorescence emission wavelength shown in FIG.
- step S111 It is determined that the fluorescence emission characteristic data 17g of the paper sheet inserted in step S111 is highly similar to the fluorescence emission characteristic data corresponding to the paper sheet type determined in step S103 extracted from the paper sheet database 17a.
- the conveyance control unit 18a conveys and stores the inserted paper sheet to the stacking unit 15 (step S113), and ends the process. If it is determined in step S111 that the similarity is not high (step S112; No), the inserted paper sheet is discharged to the reject unit 16 (step S114), and the process ends.
- the type of the paper sheet is determined based on the characteristics of the image data of the paper sheet.
- light emitting diodes that emit light of different wavelengths are used to sequentially irradiate paper sheets with excitation light having different wavelengths.
- Fluorescence emission characteristic data which is the intensity of fluorescence emission associated with the wavelength of the excitation light of the paper sheet and the band of the emission light, is acquired.
- the authenticity determination of the paper sheet is made. Since it comprised so that it could perform, the authenticity determination of multiple types of paper sheets with which the fluorescent substance which has a different fluorescence emission characteristic was added can be performed at high-speed and simply.
- Example 1 the fluorescence emission characteristic was detected using the reflection type fluorescence sensor 14.
- the material of the photodiode used for the light receiving unit 142 was silicon, and the wavelength of light that could be detected was in the range of about 190 nm to 1100 nm.
- substances that emit fluorescence there are substances that emit light with light that is not visible light, substances that emit light in a wavelength range exceeding 1100 nm, and substances that continue to emit light even when irradiation with excitation light is stopped. When there is continuous light emission after the irradiation of excitation light is stopped, this light emission is particularly called phosphorescence.
- indium gallium is capable of detecting light in a wavelength region longer than that of the first embodiment by using a fluorescence sensor 24 having a transmission structure instead of a reflection type and using infrared light as excitation light.
- a photodiode made of arsenic to determine the authenticity of paper sheets using not only the light emission characteristics during excitation light irradiation but also the light emission characteristics after stopping the excitation light irradiation, that is, the phosphorescence light emission characteristics
- the paper sheets targeted for authenticity determination in Example 1 emit fluorescent light with excitation light having a wavelength in the visible light range of A, B, C, or D, and the wavelength detectable by a photodiode made of silicon is 1100 nm.
- the following paper sheets were added with phosphors emitting infrared light.
- the paper sheets that are subject to authenticity determination in Example 2 emit fluorescence or phosphorescence with excitation light having a wavelength of A ′, B ′, C ′, or D ′ in the range of infrared light, and the emission wavelength is A ′. It is a paper sheet to which a phosphor that emits infrared light having a wavelength of 2600 nm or less that can be detected by a photodiode made of indium gallium arsenide is added.
- Example 2 three bands for detecting fluorescence emission or phosphorescence emission are set in a wavelength region longer than the excitation light A ′, and a region having a wavelength of ⁇ 1 ′ or more and less than ⁇ 2 ′ is set to band 1, ⁇ 2 ′ or more and less than ⁇ 3 ′. This region is referred to as band 2, and the region between ⁇ 3 ′ and less than ⁇ 4 ′ is referred to as band 3.
- the block is divided into 12 blocks A′1 to A′3, B′1 to B′3, C′1 to C′3, and D′ 1 to D′ 3.
- A'1 is a band 1 block in which the peak wavelength of the spectrum of the excitation light is A 'and the wavelength of the fluorescence emission is in the range from ⁇ 1' to less than ⁇ 2 '.
- A′2 is a band 2 block in which the peak wavelength of the spectrum of the excitation light is A ′ and the wavelength is in the range of ⁇ 2 ′ or more and less than ⁇ 3 ′.
- A′3 is a block of band 3 in which the peak wavelength of the spectrum of the excitation light is A ′ and the wavelength is in the range of ⁇ 3 ′ or more and less than ⁇ 4 ′.
- B′1 to B′3 are blocks whose peak wavelength of the excitation light spectrum is B ′
- C′1 to C′3 are blocks whose peak wavelength of the excitation light spectrum is C
- D′ 1 to D ′ is a block having a peak wavelength D of the excitation light spectrum.
- Example 1 the fluorescence emission intensity on the scanning line for each block was measured.
- Example 2 the fluorescence emission intensity and the phosphorescence emission intensity were measured and compared with those of authentic paper sheets. Authenticate the class.
- FIG. 12A is a view of the light source unit 245 that is a light source of excitation light of the fluorescence sensor 24 as seen from the direction of the paper sheet conveyance path.
- FIG. 12B is a diagram of the structure of the light receiving unit 242 that detects fluorescence emission and phosphorescence emission as seen from the direction of the paper sheet conveyance path.
- FIG. 12C is a cross-sectional view of the transmissive fluorescent sensor 24 taken along a vertical plane parallel to the paper sheet conveyance direction.
- the light source unit 245 is a light emitting diode that emits excitation light having four different wavelengths.
- the first light source unit 245a emits excitation light of wavelength A ′
- the second light source unit 245b emits excitation light of wavelength B ′
- the third light source unit 245c emits excitation light of wavelength C ′
- the fourth The light source unit 245d emits excitation light having a wavelength D ′.
- the light receiving unit 242 is a four-divided photodiode in which a single substrate made of indium gallium arsenide is divided into four parts, and a photodiode is provided for each.
- the light receiving unit 242 measures the intensity of light received independently by the four photodiodes. be able to.
- each of the four photodiodes can measure the intensity of light in a different wavelength band by the light receiving unit filter 243 illustrated in FIG.
- the first light receiving unit 242a measures the intensity of light in the band 1 wavelength band having a wavelength of ⁇ 1 ′ or more and less than ⁇ 2 ′
- the second light receiving unit 242b is light in the wavelength band of band 2 having a wavelength of ⁇ 2 ′ or more and less than ⁇ 3 ′
- the third light receiving unit 242c measures the intensity of light in the wavelength band of the band 3 having a wavelength of ⁇ 3 ′ or more and less than ⁇ 4 ′
- the fourth light receiving unit 242d receives the light received without filtering by the wavelength. Measure the strength.
- the fluorescence sensor 24 is installed across the paper sheet transport path, the light source unit 245 is located below the paper sheet transport path, and the light receiving part 242 is located above the paper sheet transport path.
- the light source unit 245 is located below the paper sheet transport path
- the light receiving part 242 is located above the paper sheet transport path.
- the light source unit filter 244 is a filter that cuts light having a wavelength of ⁇ 1 ′ or more, and the light source unit 245 emits light having a wavelength of ⁇ 1 ′ or more by cutting a component having a wavelength of ⁇ 1 ′ or more of the light source. This is to prevent components from being received by the light receiving unit 242. Accordingly, the light receiving unit 242 can detect only light having a wavelength of ⁇ 1 ′ or more due to fluorescence emission or phosphorescence emission.
- the fourth light receiving unit 242d is used for automatic maintenance processing when paper sheets are not processed.
- the light source unit 245 emits light and is received by the fourth light receiving unit 242d in a state where the paper sheet is not on the conveyance path.
- the light emitting diodes of the four light sources are turned on in order, and the intensity of light received by the fourth light receiving unit 242d is measured. If the intensity of light is less than a predetermined threshold value compared with the normal light intensity, it is determined as a failure. In addition, if the intensity of the four light sources exceeds the failure judgment threshold, but there is a difference from the original light intensity, the excitation light intensity can be adjusted by adjusting the current flowing through the light emitting diode. Make it possible to do.
- the horizontal axis represents the elapsed time after the excitation light is extinguished
- the vertical axis represents the emission intensity.
- the light emission intensity on the vertical axis is expressed as a ratio when the light emission intensity at the time of light irradiation is 1.
- This characteristic that light emission continues for a certain period of time even after the excitation light of phosphorescence emission is stopped is a characteristic that ordinary phosphors do not have. Therefore, the trueness of a paper sheet to which a substance having a phosphorescence emission characteristic is added. Performing the false determination using the light emission characteristics remaining after the irradiation of the excitation light is stopped increases the strictness of the determination.
- the first light source unit 245a with the wavelength A ′ starts to emit light at time t1 and is turned off at time t4
- the second light source unit 245b with wavelength B ′ starts to emit light at time t7 and turns off at time t10.
- the third light source unit 245c having the wavelength C ′ starts to emit light at time t13 and is turned off at time t16
- the fourth light source unit 245d having the wavelength D ′ starts to emit light at time t19 and is turned off at time t22.
- the light receiving unit 242 receives light at the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c at the timing when each light source emits light and the timing when each light source stops emitting light and a predetermined time elapses. Get the intensity of the light.
- light reception by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c is performed between the time t2 and the time t3 between the time t1 and the time t4 when the first light source unit 245a emits light.
- the intensity of the fluorescence and phosphorescence obtained is acquired.
- the intensity of the phosphorescence received by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c is acquired between the time t5 and the time t6 after the predetermined time elapses after the first light source unit 245a is turned off. .
- the fluorescence received by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c between the time t8 and the time t9 between the time t7 and the time t10 during which the second light source unit 245b emits light.
- the intensity of the phosphorescence received by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c is acquired between the time t11 and the time t12 after the second light source unit 245b is turned off and a predetermined time has elapsed. .
- the fluorescence received by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c between the time t14 and the time t15 between the time t13 and the time t16 during which the third light source unit 245c emits light.
- the intensity of the phosphorescence received by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c is acquired between the time t17 and the time t18 after the predetermined time elapses with the third light source unit 245c turned off. .
- the fluorescence received by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c between the time t20 and the time t21 between the time t19 and the time t22 during which the fourth light source unit 245d emits light.
- the intensity of the phosphorescence received by the first light receiving unit 242a, the second light receiving unit 242b, and the third light receiving unit 242c is acquired between the time t23 and the time t24 after the fourth light source unit 245d is turned off and a predetermined time has elapsed. .
- the fluorescence sensor 24 has a transmission structure as described with reference to FIG. 12, and the excitation light emitted from the light source unit 245 is infrared light.
- the light receiving unit 242 is a photodiode made of indium gallium arsenide, and can detect infrared light in a long wavelength region as compared with the photodiode made of silicon of Example 1. Further, since not only the fluorescence or phosphorescence during the excitation light irradiation but also the phosphorescence after the excitation light irradiation is stopped, as described with reference to FIG. It is possible to measure the emission intensity of fluorescence or phosphorescence during the emission of the phosphor and the emission intensity of phosphorescence after the light source is turned off.
- the storage unit 17 shown in FIG. 15 has the same data name, but the internal structure of each data is different from that of the first embodiment. Specifically, in Example 2, as shown in FIG. 14, the phosphorescence after the excitation light is extinguished is detected, and the phosphorescence detection result after the excitation light is extinguished is also used for the authenticity determination of the paper sheet. Each data includes information on phosphorescence after excitation light is extinguished.
- the paper sheet database 27a is associated with a paper sheet identification code for identifying a paper sheet, and is generated from information acquired from a genuine paper sheet in advance. Data on phosphorescence characteristics after light extinction is included.
- the data structure of the fluorescence sensor acquisition data 17b, the data after time axis adjustment 17c, the data before level correction 17d, the data after level correction 17e, the data 17f by band, and the fluorescence emission characteristic data 17g in Example 1 are the same.
- the fluorescence emission intensity for each point on the scanning line for each block shown in FIG. The data structures of the fluorescence sensor acquisition data 27b, post-time-axis-adjusted data 27c, pre-level correction data 27d, post-level correction data 27e, band-specific data 27f, and fluorescence emission characteristic data 27g of Example 2 are also the same as shown in FIG.
- the fluorescence sensor data acquisition unit 28c has an additional function of detecting the phosphorescence intensity after the excitation light is extinguished.
- the function of detecting the phosphorescence emission intensity after the excitation light detected by 24 is turned off and storing it as fluorescence sensor acquisition data 27b is added.
- the data structure of the fluorescence sensor acquisition data 27b is added to the data structure of the fluorescence sensor acquisition data 17b of the first embodiment with information related to the phosphorescence emission intensity after the excitation light is extinguished. Therefore, the same processing as that for the information portion relating to the fluorescence emission intensity is added to the information portion relating to the phosphorescence emission intensity after the excitation light is extinguished.
- the authenticity determination unit 28e uses the data on the phosphorescence after extinction of the excitation light added to the paper sheet database 27a and the fluorescence emission characteristic data 27g, and the characteristics of fluorescence and phosphorescence emission during excitation light irradiation and The authenticity of the paper sheet is determined based on the characteristics of phosphorescence emission after stopping the excitation light irradiation.
- the light receiving unit 242 is a photodiode made of indium gallium arsenide, and has a detectable wavelength range of infrared light up to 2600 nm, and can detect light having a longer wavelength than that of the first embodiment.
- the first light receiving unit 242a, the second light receiving unit 242b, the third light receiving unit 242c, and the fourth light receiving unit 242d detect the intensity of light in different wavelength ranges by the light receiving unit filter 243.
- the first light-receiving unit filter 243a is a filter that does not transmit light having a wavelength less than ⁇ 1 ′
- the second light-receiving unit filter 243b is a filter that does not transmit light having a wavelength less than ⁇ 2 ′
- the filter 243c is a filter that does not transmit light having a wavelength of less than ⁇ 3 ′.
- the first light receiving part filter 243a filters light entering the first light receiving part 242a, the second light receiving part 242b, and the third light receiving part 242c
- the second light receiving part filter 243b is a second light receiving part 242b and a third light receiving part.
- the light entering the 242c is filtered
- the third light receiving unit filter 243c is configured to filter the light entering the third light receiving unit 242c.
- the first light receiving unit 242a has an intensity of light having a wavelength of ⁇ 1 ′ or more
- the second light receiving unit 242b has an intensity of light having a wavelength of ⁇ 2 ′ or more
- the third light receiving unit 242c has an intensity of light having a wavelength of ⁇ 3 ′ or more. Will be detected.
- the intensity of light including all wavelengths is detected.
- the light source unit filter 244 is a filter that transmits only light having a wavelength of less than ⁇ 1 ′.
- the light source unit 245 includes four light emitting diodes, and each light emitting diode emits visible light having a different wavelength.
- the first light source unit 245a emits infrared light having a wavelength A '
- the second light source unit 245b emits infrared light having a wavelength B'
- the third light source unit 245c has infrared light having a wavelength C '.
- the fourth light source unit 245d emits infrared light having a wavelength of D ′.
- the fluorescence sensor control unit 247 performs the light emission timings of the first light source unit 245a, the second light source unit 245b, the third light source unit 245c, and the fourth light source unit 245d illustrated in FIG. Control.
- the type of the paper sheet is determined based on the characteristics of the image data of the paper sheet. Moreover, using the light emitting diode which light-emits the infrared light of a different wavelength, the excitation light which is infrared light with a different wavelength is irradiated to paper sheets in order.
- light for each band indicating the wavelength range which combines a filter having a different wavelength range for transmission and a four-division photodiode capable of detecting infrared light in a wide wavelength range capable of measuring the intensity of received light. Using the sensor capable of measuring the intensity of light, the received light intensity of each band of the emitted light of the paper sheet is measured.
- the fluorescence emission characteristic data which is the reception intensity signal of the fluorescence emission light during the excitation light irradiation, associated with the wavelength of the excitation light and the band of the reception light, and the reception intensity signal of the phosphorescence emission light after stopping the excitation light irradiation And phosphorescence emission characteristic data.
- the fluorescence emission characteristic data and phosphorescence emission characteristic data of the paper sheet obtained in this way are compared with the fluorescence emission characteristic data and phosphorescence emission characteristic data of the genuine paper sheet stored in advance for each type of paper sheet. By doing so, it is configured to determine whether the paper sheet is true or false.
- the authenticity of a plurality of types of paper sheets to which phosphors or phosphors having different emission characteristics are added by using a substance that emits infrared fluorescence or phosphorescence upon irradiation with infrared light.
- the determination can be performed quickly and easily. Needless to say, it is possible to use both the fluorescence emission characteristic data and the phosphorescence emission data, and it is possible to determine the authenticity even if only one of them is used. Further, as described in the first embodiment, the method using the threshold value may be used for the authenticity determination.
- the authenticity determination target is a paper sheet.
- the paper sheet includes securities such as securities, checks, and gift certificates, and banknotes.
- the authenticity determination of the paper sheet to which the fluorescent substance which emits the fluorescence or phosphorescence of infrared light is added by irradiating visible light or infrared light is performed.
- a light source for ultraviolet light is provided to provide a photodiode for detecting visible light or ultraviolet light, and light is emitted by ultraviolet light or visible light by irradiation with ultraviolet light.
- the authenticity of the paper sheet to which the fluorescent material to be added is added may be determined.
- the quadrant photodiode is used for the light receiving units 142 and 242 .
- the present invention is not limited to this.
- a plurality of single photodiodes may be used.
- the number of divided photodiodes need not be four, and may be less or more than four depending on the type of phosphor added to the paper sheet that is the target of authenticity determination.
- the type of the paper sheet is determined based on the characteristics of the image of the paper sheet, but the present invention is not limited to this.
- information indicating the type of paper sheet is printed by a barcode printed at a predetermined position on the paper sheet, and the type of paper sheet is determined by recognizing the printed information. May be.
- Example 1 the fluorescence emission characteristics of the phosphor added to the paper sheet
- Example 2 the fluorescence emission characteristics and phosphorescence emission characteristics of the phosphor or fluorescence / phosphor added to the paper sheet are used.
- the present invention is not limited to this, and it is assumed that the authenticity determination is performed using only the phosphorescent property of the phosphor added to the paper sheet. Also good.
- a plurality of filters that cut light having a wavelength equal to or smaller than a predetermined wavelength are used for the light receiving unit filters 143 and 243, and a predetermined value is obtained by calculation using the measured light reception intensity.
- the intensity of light having a wavelength in the range is described, but the present invention is not limited to this, and the intensity of light having a wavelength in the predetermined range may be directly measured using a filter that transmits only the predetermined range. .
- the blocks A1 to D3 and A'1 to D'3 in FIG. 2A and FIG. 11 can be called a matrix.
- the paper sheet database 17a of the storage unit 17 27a determines which block of the matrix should be used according to the type of paper sheet and the transport direction, stores it in advance, and stores it in the type and transport direction of the paper sheet read at the time of authenticity determination.
- the block to be used can be read and the fluorescence emission characteristic data of that block can be used.
- each configuration illustrated in the above-described first and second embodiments is functionally schematic and does not necessarily need to be physically configured as illustrated. That is, the form of distribution / integration of each device is not limited to that shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in an arbitrary unit according to various loads or usage conditions. Can be configured.
- the paper sheet authenticity determination device is capable of high-speed and simple determination of authenticity of a plurality of types of paper sheets to which fluorescent and phosphor materials having different fluorescence and / or phosphorescence emission characteristics are added. It is suitable for realizing.
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Abstract
Description
Er:Gd2O2S
Er:NaYW2O6
Yb,Er:CaF2
などを用いることができる。これらの物質は、波長が約550nmの励起光で波長が約1100nmの蛍光発光をすることが知られている。
11 載置部
12 搬送部
13 ラインセンサ
14、24 蛍光センサ
141 Amp基板
142、242 受光部
142a、242a 第1受光部
142b、242b 第2受光部
142c、242c 第3受光部
142d、242d 第4受光部
143、243 受光部フィルタ
143a、243a 第1受光部フィルタ
143b、243b 第2受光部フィルタ
143c、243c 第3受光部フィルタ
144、244 光源部フィルタ
145、245 光源部
145a、245a 第1光源部
145b、245b 第2光源部
145c、245c 第3光源部
145d、245d 第4光源部
146 LED制御基板
147、247 蛍光センサ制御部
15 集積部
16 リジェクト部
17 記憶部
17a、27a 紙葉類データベース
17b、27b 蛍光センサ取得データ
17c、27c 時間軸調整後データ
17d、27d レベル補正前データ
17e、27e レベル補正後データ
17f、27f バンド別データ
17g、27g 蛍光発光特性データ
18 制御部
18a 搬送制御部
18b 紙葉類種類判定部
18c、28c 蛍光センサデータ取得部
18d、28d 蛍光発光特性データ生成部
18e、28e 真偽判定部
51 繰出部
51a キッカローラ
51b フィードローラ
51c ゲートローラ
52 識別計数ユニット
53 分岐部
54 表示操作部
55 羽根車式集積機構
55a 羽根車
55b 羽根
56 シャッター
61 載置部残留紙葉類検出センサ
62a、62b、62c、62d、62e、62f、64 紙葉類通過検出センサ
63 分岐用タイミングセンサ
65 集積部紙葉類検出センサ
66 リジェクト部紙葉類検出センサ
Claims (12)
- 蛍光体が付加された紙葉類の真偽を判定する紙葉類真偽判定装置であって、
少なくとも、前記紙葉類の種類を判別する種類判別部と、
波長の異なる複数の励起光から1つの励起光を選択して前記紙葉類に照射する励起光光源と、
前記紙葉類に付加された蛍光体が発する光のうち、それぞれが異なる所定範囲の波長帯域の光のみを透過する複数種のフィルタと、
前記複数種のフィルタの各々に対応して設けられ、前記フィルタが透過した光を受光する複数の受光器と、
前記励起光光源から選択された波長の励起光が照射されたときに前記複数の受光器が受光した前記所定範囲の波長帯域の受光強度に基づいた蛍光発光特性データを生成する蛍光発光特性データ生成部と、
予め、前記紙葉類の種類に応じた真正な紙葉類の蛍光発光特性データもしくは、真正な紙葉類の蛍光発光特性データから求めた判定基準値を格納している記憶部と、
前記種類判別部により判別された前記紙葉類の種類に対する真正な前記紙葉類の前記記憶部に記憶されている蛍光発光特性データもしくは判定基準値と、前記蛍光発光特性データ生成部により生成された前記蛍光発光特性データとを用いて、前記紙葉類の真偽の判定を行う真偽判定部と
を備えたことを特徴とする紙葉類真偽判定装置。 - 前記励起光光源、前記複数種のフィルタ及び前記複数の受光器が全て、前記紙葉類の一方の面側に設けられていることを特徴とする請求項1に記載の紙葉類真偽判定装置。
- 前記励起光光源を前記紙葉類の一方の面の側に設け、前記複数種のフィルタ及び前記複数の受光器を前記紙葉類の他方の面の側に設けたことを特徴とする請求項1に記載の紙葉類真偽判定装置。
- 前記励起光光源が前記紙葉類に波長の異なる複数の励起光から1つの励起光を選択して前記紙葉類に照射している間に、前記複数の受光器のそれぞれは、前記複数種のフィルタを透過したそれぞれの光の強度を同時又は、シーケンシャルに受光することを特徴とする請求項1~3のいずれか一つに記載の紙葉類真偽判定装置。
- 前記励起光光源は周期的に複数の波長の励起光をそれぞれ順次照射し、前記複数の受光器は周期的に複数の波長帯域の光を一波長帯域ずつ順次受光し、前記蛍光発光特性データ生成部は、前記複数の受光器で受光した当該波長帯域の受光強度に基づいた前記蛍光発光特性データをそれぞれ生成することを特徴とする請求項4に記載の紙葉類真偽判定装置。
- 前記蛍光発光特性データ生成部は、
前記複数の励起光の波長がそれぞれ属する複数の励起光波長範囲と、前記複数種のフィルタがそれぞれ透過する受光波長帯域とで励起波長と受光波長帯域によるマトリクスを構成し、
前記励起光光源によって波長の異なる複数の励起光を順次前記紙葉類に照射し、前記複数種のフィルタで透過された光のそれぞれの受光強度を対応する受光器で受光し、前記マトリクスの各領域における受光強度に基づいた前記蛍光発光特性データを生成し、
前記記憶部が更に、前記紙葉類の種類毎に真偽判定に使用する前記マトリクスの領域を記憶しており、
前記真偽判定部が、前記種類判別部の結果に基づいて、前記記憶部に記憶されている前記紙葉類の種類毎に特定されているマトリクスの利用領域の前記蛍光発光特性データを用いて真偽判別を行うことを特徴とする請求項1~5のいずれか一つに記載の紙葉類真偽判定装置。 - 前記真偽判定部は、前記受光器の受光強度が所定値以上の場合には対応する波長帯域の光の受光ありと判定し、受光強度が所定値未満の場合には対応する波長帯域の光の受光がないと判定することを特徴とする請求項1~6のいずれか一つに記載の紙葉類真偽判定装置。
- 前記紙葉類の光学イメージを取得する光学イメージ取得部をさらに備え、
前記種類判別部は、前記紙葉類を搬送しつつ前記光学イメージ取得部により取得された所定の領域の画像データを利用して前記紙葉類の少なくとも種類の判別を行う
ことを特徴とする請求項1~7のいずれか一つに記載の紙葉類真偽判定装置。 - 前記複数の受光器は、搬送される前記紙葉類の受光強度を測定し、前記蛍光発光特性データ生成部は、前記紙葉類の位置に対して前記複数の受光器で測定した受光強度に基づいて前記蛍光発光特性データを生成することを特徴とする請求項1~8のいずれか一つに記載の紙葉類真偽判定装置。
- 前記複数の受光器は、前記励起光光源による励起光を照射中の前記受光強度を受光するとともに、前記励起光光源消灯後の受光強度を燐光強度として受光し、
前記蛍光発光特性データ生成部は、更に前記燐光強度に基づいた燐光発光特性データを生成し、
前記記憶部は、予め、前記紙葉類の種類に応じた真正な紙葉類の燐光発光特性データもしくは、該燐光発光特性データから求めた判定基準値を更に格納しており、
前記真偽判定部は、前記種類判別部で判別された前記紙葉類の種類に基づいて、前記記憶部に格納されている前記真正な紙葉類の燐光についての燐光発光特性データ、もしくは燐光発光特性データ及び蛍光発光特性データの両方と、前記記憶部に格納されている燐光発光特性データ、もしくは燐光発光特性データ及び蛍光発光特性データの両方とを用いて、前記紙葉類の真偽の判定を行う
ことを特徴とする請求項1~9のいずれか一つに記載の紙葉類真偽判定装置。 - 前記励起光光源は、可視光領域で波長の異なる複数の励起光を発光するとともに、
前記複数種のフィルタは赤外光領域で異なる波長の範囲の光を透過させる
ことを特徴とする、請求項1~10のいずれか一つに記載の紙葉類真偽判定装置。 - 前記励起光光源は、赤外光領域で波長の異なる複数の励起光を発光するとともに、
前記複数種のフィルタは赤外光領域で異なる波長の範囲の光を透過させる
ことを特徴とする、請求項1~10のいずれか一つに記載の紙葉類真偽判定装置。
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2013/076628 WO2015045186A1 (ja) | 2013-09-30 | 2013-09-30 | 紙葉類真偽判定装置 |
| JP2015538825A JP6088060B2 (ja) | 2013-09-30 | 2013-09-30 | 紙葉類真偽判定装置 |
| CN201380079598.1A CN105556578A (zh) | 2013-09-30 | 2013-09-30 | 纸张真伪判定装置 |
| US15/021,882 US10176659B2 (en) | 2013-09-30 | 2013-09-30 | Paper sheet authentication apparatus |
| RU2016109657A RU2635298C2 (ru) | 2013-09-30 | 2013-09-30 | Устройство для аутентификации листа бумаги |
| EP13894480.6A EP3054427A4 (en) | 2013-09-30 | 2013-09-30 | Paper sheet counterfeit determination device |
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| PCT/JP2013/076628 WO2015045186A1 (ja) | 2013-09-30 | 2013-09-30 | 紙葉類真偽判定装置 |
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| EP (1) | EP3054427A4 (ja) |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016151964A (ja) * | 2015-02-18 | 2016-08-22 | グローリー株式会社 | 蛍光燐光検知装置、蛍光燐光検知方法及び紙葉類処理装置 |
| WO2018181134A1 (ja) * | 2017-03-27 | 2018-10-04 | グローリー株式会社 | 光センサ、光検出装置、紙葉類処理装置、光検出方法及び燐光検出装置 |
| JP2018163080A (ja) * | 2017-03-27 | 2018-10-18 | グローリー株式会社 | 光センサ、光検出装置、紙葉類処理装置及び光検出方法 |
| JP2018163568A (ja) * | 2017-03-27 | 2018-10-18 | グローリー株式会社 | 燐光検出装置、紙葉類処理装置及び燐光検出方法 |
| JP2018163567A (ja) * | 2017-03-27 | 2018-10-18 | グローリー株式会社 | 燐光検出装置、紙葉類処理装置及び燐光検出方法 |
| CN108780594A (zh) * | 2016-03-16 | 2018-11-09 | 凸版印刷株式会社 | 识别装置、识别方法、识别程序以及包含识别程序的计算机可读介质 |
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| CN107014794A (zh) * | 2017-05-08 | 2017-08-04 | 西安印艺苑实业有限公司 | 纸张荧光检测的方法、装置和系统、存储介质、处理器 |
| DE102017008970B4 (de) | 2017-09-26 | 2024-04-18 | Giesecke+Devrient Currency Technology Gmbh | Sensorvorrichtung und Verfahren zur Prüfung von Wertdokumenten, insbesondere Banknoten, sowie Wertdokumentbearbeitungssystem |
| JP6967660B2 (ja) * | 2018-03-30 | 2021-11-17 | グローリー株式会社 | 光検出センサ、光検出装置、および、紙葉類処理装置 |
| KR102402407B1 (ko) * | 2020-09-03 | 2022-05-27 | 한국조폐공사 | 형광물질의 강도를 이용한 보안 물품 및 그를 이용한 사용자 식별시스템 |
| EP4295333B1 (de) * | 2021-02-16 | 2024-11-06 | Giesecke+Devrient Currency Technology GmbH | Sensor zur prüfung der lumineszenz von wertdokumenten |
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| JP2016151964A (ja) * | 2015-02-18 | 2016-08-22 | グローリー株式会社 | 蛍光燐光検知装置、蛍光燐光検知方法及び紙葉類処理装置 |
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| CN108780594B (zh) * | 2016-03-16 | 2024-04-05 | 凸版印刷株式会社 | 识别装置、识别方法、识别程序以及包含识别程序的计算机可读介质 |
| US10943421B2 (en) | 2016-03-16 | 2021-03-09 | Toppan Printing Co., Ltd. | Identification device, identification method, identification program, and computer-readable medium including identification program |
| EP3432277A4 (en) * | 2016-03-16 | 2019-11-20 | Toppan Printing Co., Ltd. | IDENTIFIER, IDENTIFICATION PROCEDURE, IDENTIFICATION PROGRAM AND COMPUTER READABLE MEDIUM WITH THE IDENTIFICATION PROGRAM |
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| JP2018163080A (ja) * | 2017-03-27 | 2018-10-18 | グローリー株式会社 | 光センサ、光検出装置、紙葉類処理装置及び光検出方法 |
| JP7017862B2 (ja) | 2017-03-27 | 2022-02-09 | グローリー株式会社 | 光センサ、光検出装置、紙葉類処理装置及び光検出方法 |
| US11467087B2 (en) | 2017-03-27 | 2022-10-11 | Glory Ltd. | Optical sensor, light detection apparatus, sheet processing apparatus, light detection method, and phosphorescence detection apparatus |
| WO2018181134A1 (ja) * | 2017-03-27 | 2018-10-04 | グローリー株式会社 | 光センサ、光検出装置、紙葉類処理装置、光検出方法及び燐光検出装置 |
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| JP7141274B2 (ja) | 2018-08-01 | 2022-09-22 | 株式会社ヴィーネックス | 光ラインセンサユニット |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2635298C2 (ru) | 2017-11-09 |
| CN105556578A (zh) | 2016-05-04 |
| EP3054427A4 (en) | 2017-05-17 |
| EP3054427A1 (en) | 2016-08-10 |
| US10176659B2 (en) | 2019-01-08 |
| JPWO2015045186A1 (ja) | 2017-03-09 |
| RU2016109657A (ru) | 2017-09-22 |
| JP6088060B2 (ja) | 2017-03-01 |
| US20160225215A1 (en) | 2016-08-04 |
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