WO2009157049A1 - Détecteur pour l’identification d’une feuille de papier - Google Patents

Détecteur pour l’identification d’une feuille de papier Download PDF

Info

Publication number
WO2009157049A1
WO2009157049A1 PCT/JP2008/061395 JP2008061395W WO2009157049A1 WO 2009157049 A1 WO2009157049 A1 WO 2009157049A1 JP 2008061395 W JP2008061395 W JP 2008061395W WO 2009157049 A1 WO2009157049 A1 WO 2009157049A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
paper sheet
prism
identification
light source
Prior art date
Application number
PCT/JP2008/061395
Other languages
English (en)
Japanese (ja)
Inventor
秀行 是常
Original Assignee
グローリー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by グローリー株式会社 filed Critical グローリー株式会社
Priority to PCT/JP2008/061395 priority Critical patent/WO2009157049A1/fr
Publication of WO2009157049A1 publication Critical patent/WO2009157049A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties

Definitions

  • the present invention relates to a paper sheet identification sensor used for identifying paper sheets such as securities, gift certificates, coupon tickets, admission tickets, checks, bills, banknotes, and the like.
  • the present invention relates to a paper sheet identification sensor that obtains a spectral spectrum by separating light from the light and makes it possible to identify paper sheets.
  • a valuable paper sheet may be formed of a sheet containing an infrared or ultraviolet reflective material.
  • Patent Document 2 there is a case where a light emitting substance that emits light in a specific wavelength region when irradiated with light in a specific wavelength region in the ultraviolet region or infrared region is imparted to the surface of the paper.
  • the paper sheet is irradiated with light, and light of a specific wavelength (one type or light) out of the light from the paper sheet. A plurality of types of light intensities are detected, and paper sheets are identified based on the light intensity.
  • a paper sheet identification sensor used for identifying a paper sheet a spectral spectrum can be obtained by irradiating the paper sheet with light and spectrally dividing the light from the paper sheet.
  • the thing of a structure is preferable. This is because a configuration for obtaining a spectral spectrum can deal with a wide variety of substances imparted to paper sheets and can be used for general purposes.
  • Patent Documents 3 and 4 disclose paper sheet identification devices that use a spectral spectrum.
  • FIG. 17 is a schematic plan view illustrating a configuration of a paper sheet identification sensor (conventional paper sheet identification sensor) included in the paper sheet identification apparatus disclosed in Patent Document 3.
  • the conventional paper sheet identification sensor 100 light is emitted from a lamp 101 that generates light in the entire visible light band, such as a white lamp or a tungsten lamp.
  • the light emitted from the lamp 101 is collected in a spot shape by the condenser lens 102.
  • the transmitted light transmitted from the banknote (an example of a paper sheet) 107 passes through the slit 103 a formed in the slit member 103 to become parallel light, and is split by the prism 104 having a triangular prism shape.
  • the split light is received by the one-dimensional CCD 105, whereby a spectral spectrum is obtained.
  • a signal (spectral spectrum information) from the one-dimensional CCD 105 is read by the pattern discriminating unit 106, and the bill 107 is identified (identification of whether it is genuine or fake, etc.).
  • the conventional paper sheet identification sensor 100 using the above-described prism 104 has the following problems.
  • a transparent member such as a glass member constituting the prism
  • the refractive index usually decreases as the wavelength of light increases, and the change in refractive index with respect to the wavelength change decreases.
  • a light receiving unit one-dimensional CCD
  • the separation between wavelengths in the red to infrared wavelength region is poor.
  • Tend. since a spectral pattern that should originally be obtained at a wavelength in the red to infrared region cannot be obtained, it is impossible to accurately identify paper sheets having a spectral pattern characteristic in the red to infrared region. Problems arise.
  • an object of the present invention is a paper sheet identification sensor formed so as to obtain a spectral spectrum by dispersing light from a paper sheet. It is an object of the present invention to provide a paper sheet identification sensor capable of improving accuracy. Another object of the present invention is to provide a paper sheet identification sensor that achieves the above-described object and can be used universally without being limited to a specific species.
  • the present invention provides a paper sheet identification sensor used for identifying a paper sheet, the light source for irradiating light to the identification object that is the paper sheet, Arranged at a position where light from the identification object irradiated with light from the light source can be received, a prism formed in a substantially triangular prism shape, and a position where light dispersed by the prism can be received And a light receiving portion having a plurality of light receiving elements arranged in a line, and the exit surface of the prism for emitting the dispersed light is a convex R shape.
  • the light from the identification target is dispersed using the prism, and a spectral spectrum is obtained. Since the light emission surface of the prism has a convex R shape, it is possible to improve the separation characteristics by reducing the amount of overlap of light of each wavelength on the light receiving surface with respect to light in the red to infrared region. For this reason, according to the paper sheet identification sensor of this configuration, it is possible to improve the accuracy of the spectrum in the red to infrared region, which has been a problem when the conventional prism is used. Therefore, according to this configuration, it is possible to provide a paper sheet identification sensor that can be used universally without being limited to a specific species.
  • the prism is provided with a notch for emitting the light reflected by the emission surface to the outside of the prism.
  • stray light that is received by the light receiving portion after being reflected inside the prism can be reduced due to the presence of the cutout portion. For this reason, it is possible to reduce the possibility of color mixing in the light receiving unit, and to obtain a more accurate spectral spectrum.
  • the cutout portion has a surface perpendicular to a traveling direction of light when light having a central wavelength incident on the prism is reflected by the emission surface. It is preferable to form so that it has. If the notch is formed in this way, the light reflected by the emission surface of the prism and propagated through the prism can be efficiently emitted to the outside, and the amount of stray light received by the light receiving unit can be reduced.
  • a slit through which light from the identification target passes is disposed in the optical path before the prism, and further, the optical path in front of the slit.
  • a parallel light conversion lens for converting light from the identification object into parallel light is disposed.
  • the light source emits white light including infrared light and is transmitted through the identification target or reflected by the identification target.
  • the reflected light may be formed so as to be incident on the prism.
  • a monitoring light receiving element for monitoring the light emission amount of the light source may be further provided.
  • the paper sheet identification sensor configured in this way, it becomes possible to identify paper sheets using a transmission spectrum or a reflection spectrum obtained from an object to be identified which is a paper sheet.
  • the prism used for spectroscopy has a convex R shape, for example, even paper sheets having a characteristic spectrum in the red to infrared region can be accurately identified. It becomes.
  • the light source emits ultraviolet light, and the light excited by the identification target by being irradiated with the light from the light source, It may be formed so as to be incident on the prism.
  • a monitoring light receiving element for monitoring the light emission amount of the light source may be further provided.
  • the paper sheet identification sensor configured in this way, it is possible to identify paper sheets using the emitted light (fluorescence) spectrum obtained when the object to be identified is irradiated with ultraviolet light. It becomes. According to this configuration, since the prism used for spectroscopy has a convex R shape, even if the fluorescence spectrum of the paper sheet has a characteristic spectrum in the red to infrared region, it is accurate. Identification becomes possible.
  • the light source includes a first light source that emits white light including infrared light and a second light source that emits ultraviolet light,
  • a first dichroic mirror that transmits one of the light from the first light source and the light from the second light source and reflects the other in the optical path between the light source and the identification target. Disposed in the optical path between the identification object and the parallel light conversion lens, guides ultraviolet light to a light-receiving element for monitoring for monitoring the amount of light emitted from the second light source, and emits light other than ultraviolet light.
  • a second dichroic mirror that guides the light to the parallel light conversion lens may be disposed.
  • Paper sheets can also be identified using an excitation light (fluorescence) spectrum obtained when the body is irradiated with ultraviolet light. That is, the range of types of paper sheets that can be applied is widened, and versatility is enhanced.
  • the prism used for spectroscopy has a convex R shape, accurate identification is possible even when the spectral characteristic portion is in the red to infrared region.
  • the light source includes two light sources that emit white light, and the two light sources are applied to the identification target at different angles.
  • the light that is arranged so as to be incident thereon and transmitted through the object to be identified or reflected light that is reflected by the object to be identified may be formed so as to be incident on the prism.
  • a paper sheet identification sensor formed so as to obtain a spectroscopic spectrum by dispersing light from a paper sheet, and the paper sheet capable of improving spectral accuracy in a red to infrared region.
  • An identification sensor can be provided. Further, according to the present invention, it is possible to provide a paper sheet identification sensor that can be used for general purposes without being limited to a specific species.
  • Paper sheet identification sensor 10 Object to be identified 11a, 21a, 41a, 42a LED (light source) 13 Collimating lens (parallel light conversion lens) 14a Slit 15 Prism 15a Output surface 16 One-dimensional image sensor (light receiving unit) 18 Notch 24 Light-receiving element for monitoring 31 First dichroic mirror 32 Second dichroic mirror
  • paper sheets to be identified by the paper sheet identification sensor of the present invention include securities, gift certificates, coupon tickets, admission tickets, checks, bills, and banknotes.
  • FIG. 1 is a schematic diagram illustrating a configuration of a paper sheet identification sensor according to the first embodiment.
  • the paper sheet identification sensor 1 according to the first embodiment includes a light source unit 11, a condenser lens 12, a collimator lens 13, a slit member 14, a prism 15, and a light receiving unit 16. .
  • the light source unit 11 is provided for irradiating the paper with light, and includes a light emitting diode (LED) 11a and a light source substrate 11b on which a circuit for controlling driving of the LED 11a is formed.
  • LED11a of this embodiment is the structure which combined white LED and infrared LED, and can radiate
  • any light source that emits white light including infrared light may be used.
  • a white lamp such as a tungsten lamp or a halogen lamp may be used.
  • the condensing lens 12 condenses light emitted from the LED 11a and transmitted through the identification object 10 which is a paper sheet.
  • the reason why such a condensing lens 12 is arranged is to improve the light use efficiency. For this reason, when the identification of the identification target 10 can be performed at a satisfactory level without increasing the light use efficiency, the condensing lens 12 may not be disposed.
  • the collimating lens 13 converts the light collected by the condenser lens 12 into parallel light and emits it.
  • the light converted into parallel light by the collimating lens 13 passes through a slit 14a provided in the slit member 14 and becomes a thin light beam (for example, a light beam having a diameter of 200 ⁇ m).
  • the reason why the collimating lens 13 and the slit 14 member are used to produce parallel light and a narrow light beam is to appropriately perform the spectroscopy by the prism 15.
  • the prism 15 divides the incident light and emits the light from the emission surface 15 a to the light receiving unit 16.
  • the prism 15 has a substantially triangular prism shape and is made of a transparent member such as glass or resin.
  • the exit surface 15a of the prism 15 has a convex R shape.
  • the cross section of the prism 15 has a circular arc and has a fan shape. This point is different from the conventional prism 104 (see FIG. 17), and the reason for forming it will be described later.
  • the light receiving unit 16 includes a one-dimensional CCD image sensor having a plurality of light receiving elements arranged in a line.
  • the arrangement direction of the light receiving elements is configured to correspond to the direction in which light is split by the prism 15.
  • the CCD image sensor 16 receives light emitted from the emission surface 15a of the prism 15, photoelectrically converts it, and outputs an electrical signal.
  • the CCD image sensor 16 is mounted on the sensor substrate 17. On the sensor substrate 17, an electric circuit for processing an electric signal from the CCD image sensor 16 is formed.
  • the light receiving unit 16 is composed of a CCD image sensor, but the present invention is not limited to this.
  • a configuration including a CMOS image sensor or a line sensor including a photodiode array arranged in a line may be used.
  • the CCD image sensor 16 also has a monitor function for controlling the light quantity of the LED 11a. Specifically, the total amount of light received by the CCD image sensor 16 is calculated, and the amount of light emitted from the LED 11a is monitored. The LED 11a is controlled so that the amount of emitted light is constant at a predetermined value using this monitoring result.
  • the CCD image sensor 16 has a monitor function for controlling the light quantity of the LED 11a.
  • a dedicated light receiving element may be arranged to monitor the amount of light emitted from the LED 11a.
  • the paper sheet identification sensor 1 formed as described above by receiving light from the identification target 10, for example, a wavelength range from ultraviolet to infrared (more specifically, for example, 350 nm to 1000 nm, etc.) ) Is obtained. For this reason, it becomes possible to perform identification of the identification target 10 (for example, authentic identification such as whether the identification target 10 is genuine or fake) by the spectral spectrum.
  • a wavelength range from ultraviolet to infrared more specifically, for example, 350 nm to 1000 nm, etc.
  • FIGS. 2A and 2B some paper sheets are printed with special ink so as to show a characteristic spectral pattern in the infrared region, for example, to prevent forgery.
  • FIG. 2A is a diagram showing a reflection spectrum of a genuine note processed so as to show a characteristic spectral pattern in the infrared region and a forged ticket not subjected to such processing. Note that the reflectance (%) in FIG. 2A is a reflectance with respect to a white medium (white reference).
  • FIG. 2B is a diagram for clarifying the difference between the genuine note and the counterfeit ticket of FIG. 2A.
  • a reference spectrum created using the genuine note obtained as a measured average value of a plurality of genuine notes
  • the paper sheet identification sensor 1 of the present embodiment it is possible to authenticate a paper sheet having a characteristic spectral pattern in such an infrared region.
  • the infrared region separation characteristic of the prism 104 is poor, and it is difficult to identify paper sheets having a spectral pattern characteristic in the infrared region. there were.
  • the paper sheet identification sensor 1 of the present embodiment improves the separation characteristics by making the exit surface 15a of the prism 15 have a convex R shape as described above. This will be described in detail below.
  • FIG. 3A is a schematic diagram showing a premise for explaining the problems of the conventional prism.
  • the prism is a regular triangular prism, and light from a point light source is incident on the regular triangular prism.
  • the regular prismatic prism is adjusted and arranged so that the traveling direction of light having a wavelength of 675 nm out of the light traveling in the regular triangular prism is parallel to the bottom surface of the regular triangular prism.
  • the adjustment of the regular triangular prism as described above is based on the premise that the sheet identification sensor is formed so that a spectral spectrum in the wavelength range of 350 nm to 1000 nm can be obtained.
  • the center wavelength is taken into consideration.
  • FIG. 3B is a diagram schematically showing a state in which light incident on the regular triangular prism in FIG. 3A is split. As shown in FIG. 3B, the light incident on the regular triangular prism is split by the regular triangular prism. At this time, light having a shorter wavelength is bent more greatly and is emitted from the regular triangular prism.
  • the refractive index n has wavelength dependence, and this is expressed by a dispersion formula such as Cauchy's formula or sellmeier's formula.
  • the refractive index n ( ⁇ ) of light of each wavelength is determined using a dispersion formula (which is an expression based on the sellmeier's expression) shown below as Equation 1.
  • nd is the refractive index of the d-line (wavelength 587.6 nm)
  • ⁇ d is the Abbe number.
  • the values of nd and ⁇ d are generally found experimentally as material properties and are given in the property table.
  • da2 represents the slope of the refractive index on the graph indicating the wavelength dependence, and is empirically given by the following equation (2).
  • Equation 2 d ⁇ , d ⁇ , and d ⁇ are obtained as follows.
  • Equations 1 to 5 It is. ⁇ d is the wavelength of the d line, 587.6 nm, ⁇ F is the wavelength of the F line, 486.1 nm, and ⁇ c is the wavelength of the C line, 656.3 nm.
  • the incident angle ⁇ of light incident on the regular triangular prism is constant.
  • N ( ⁇ ) is obtained by the above-described dispersion formula.
  • FIG. 4 is a graph for explaining the problems of the conventional prism. Specifically, ⁇ ′ at 675 nm is used as a reference value, and a difference ( ⁇ ′) between the reference value and ⁇ ′ at each wavelength is obtained and graphed.
  • the rate of change of ⁇ ′ with respect to the wavelength change every 50 nm decreases. That is, in the red to infrared wavelength range, as shown in FIG. 3B, the interval between the positions where the light of each wavelength reaches the light receiving surface becomes narrow. In other words, the separation characteristics of the regular triangular prism are deteriorated at wavelengths from red to infrared.
  • the light incident on the regular triangular prism is assumed to be light from a point light source.
  • the light incident on the regular triangular prism is parallel light having a certain width (for example, 200 ⁇ m).
  • a parallel light error for example, about ⁇ 0.1 °
  • the light incident on the regular triangular prism is slightly divergent. It becomes.
  • the light emitted from the regular prismatic prism and received by the light receiving surface has a width larger than the width of the light incident on the regular triangular prism. That is, it can be seen that the separation characteristics of the regular triangular prism in the red to infrared wavelength range are worse than those described with reference to FIGS. 3A and 3B.
  • 5A and 5B are schematic diagrams for explaining the results of a more detailed examination of the problems of the conventional regular triangular prism.
  • FIG. 6 is a diagram showing results of optical simulation regarding the exit surface of the prism, and shows four simulation results. Specifically, from the left in FIG. 6, when the exit surface is a flat surface (that is, the same shape as a conventional regular triangular prism), when the exit surface is concave and has an R shape of R30 mm, the exit surface is convex and When it is R shape of R30mm, the simulation result in case the output surface is convex and it is R shape of R20mm is shown.
  • the graph described in the middle part of FIG. 6 shows how much the light of each wavelength is received with respect to the center of the light receiving surface.
  • the graph shown in the lower part of FIG. 6 is an enlarged view showing the results of the wavelengths in the red to infrared region for the middle part of the graph.
  • the length of one side of the prism (the length of the exit surface is appropriately changed) was set to 10 mm.
  • the light receiving surface needs to be arranged in the vicinity ( ⁇ 10 mm) of the prism.
  • the light receiving surface needs to be arranged at right angles to the outgoing light having a central wavelength of 675 nm (which is the outgoing light from the prism). Considering these points, a distance d (see FIG. 6) between the center position of the light receiving surface and a specific vertex of the prism is determined.
  • the simulation was performed assuming that the light incident on the prism is parallel light of ⁇ 200 ⁇ m and the parallel light error is ⁇ 0.1 °.
  • the material constituting the prism is preferably a material having a large refractive index and a low Abbe number.
  • FF9 d-line refractive index 1.8083, Abbe number 22.61
  • HOYA glass material manufactured by HOYA
  • the simulation result shown in FIG. 6 will be described in comparison with the case where the exit surface is a plane (the leftmost side in FIG. 6 is applicable).
  • the exit surface is a concave R shape
  • the chromatic dispersion increases (refer to the chromatic dispersion distance shown in the figure), but in the red to infrared region, the distribution width of the light of each wavelength increases and the separation characteristics deteriorate. I understand that.
  • the exit surface has a convex R shape, the chromatic dispersion is reduced, but the distribution width of light of each wavelength in the red to infrared region is reduced and the separation characteristics are improved.
  • the characteristics change depending on the size of R even in the same convex R shape.
  • the size of R is reduced from R30 mm to R20 mm (the curvature of the arc increases)
  • the separation characteristic between wavelengths deteriorates in the red region (for example, refer to the result of wavelength 650 nm). It was.
  • the output surface 15a (see FIG. 1) of the prism 15 is determined to be a convex surface of R30 mm.
  • FIG. 7A and 7B are views for explaining the effect of the prism 15 provided in the paper sheet identification sensor 1 of the first embodiment.
  • the emission surface 15a of the prism 15 has a convex R shape
  • parallel light having a certain width incident on the prism 15 travels at different angles depending on the emission position.
  • the convex R shape because of the convex R shape, the light is condensed by the lens action, and the width of the light on the light receiving surface is smaller than that when entering the prism 15.
  • the light incident on the prism 15 is slightly diverging light due to the parallel light error. For this reason, the width of the light traveling in the prism 15 is wider than that at the time of incidence.
  • the emission surface 15a of the prism 15 has a convex R shape, the light is condensed by the lens action, and the spread of the light width on the light receiving surface is suppressed.
  • the prism 15 of the present embodiment is used, the separation characteristics are improved as compared with the conventional prism having a flat exit surface.
  • FIG. 8 is a view showing a more preferable form as the prism 15 provided in the paper sheet identification sensor 1 of the first embodiment.
  • the light propagating through the prism 15 includes light that is reflected without being emitted from the emission surface 15a.
  • Such light includes light (stray light) emitted from the emission surface 15a after being further reflected in the prism.
  • stray light enters the CCD image sensor 16
  • color mixing occurs, and the accuracy of the obtained spectral spectrum decreases.
  • a triangular prism-shaped notch 18 on the bottom surface 15b of the prism 15 (which is an expression referring to FIG. 8). In this way, the incident angle at which the light reflected by the exit surface 15a of the prism 15 and propagating inside the prism 15 toward the bottom surface 15b enters the boundary surface 18a with the outside becomes small. If the incident angle is reduced in this way, the amount of light transmitted to the outside increases, and the influence of stray light can be reduced.
  • the incident angle at which the reflected light enters the boundary surface 18a is 0 ° (that is, reflection at a wavelength of 675 nm).
  • the notch 18 is provided so that the boundary surface 18a is perpendicular to the traveling direction of light.
  • the shape of the notch 18 is a triangular prism shape, but the present invention is not limited to this. It is sufficient if the light reflected by the emission surface 15a of the prism 15 can be emitted to the outside of the prism, and the shape of the notch 18 can be changed as appropriate.
  • FIG. 9 is a schematic plan view illustrating a configuration of a paper sheet identification apparatus including the paper sheet identification sensor 1 according to the first embodiment.
  • the configuration of the paper sheet identification device 51 will be described with reference to FIG.
  • the paper sheet identification device 51 includes an insertion port 52 of the identification object 10, a conveyance path 53 for conveying the identification object 10 drawn into the apparatus from the insertion port 52, and a conveyance object conveyed through the conveyance path 53. And a discharge port 54 for discharging the identification body 10 out of the apparatus.
  • a pair of drawing rollers 55 provided near the insertion port 52 for pulling the identification object 10 into the apparatus and the identification object 10 drawn into the apparatus are conveyed and discharged.
  • a pair of transport rollers 56 for discharging from 54 to the outside of the apparatus.
  • the drawing roller 55 and the conveyance roller 56 are driven by a motor (not shown).
  • the paper sheet identification sensor 1 is disposed in a space between the drawing roller 55 and the conveyance roller 56.
  • the light source unit 11 is disposed on the lower side of the conveyance path 23, and the other is disposed on the upper side of the conveyance path 23.
  • the paper sheet identification device 51 further includes an identification unit 57 that identifies the authenticity of the identification target 10 drawn into the apparatus, and a control unit 58 that controls driving of the entire apparatus.
  • the identification target 10 is drawn into the apparatus from the insertion port 52 by the drawing roller 55.
  • the identification object 10 drawn into the apparatus is irradiated with light by the LED 11a which is a light source.
  • the transmitted light that has passed through the identification target 10 is collected in a spot shape by the condenser lens 12.
  • the light collected by the condenser lens 12 is converted into parallel light by the collimating lens 13 and then passes through the slit 14a to become a thin light beam (for example, a light beam having a diameter of about 200 ⁇ m). Thereafter, the light incident on the prism 15 is split, and the split light is received by the CCD image sensor 16.
  • a signal output from the CCD image sensor 16 is processed by the sensor substrate 17 and output to the identification unit 57.
  • the identification unit 57 compares the input information (spectral spectrum information) with reference information (spectral spectrum information) recorded in advance, and identifies the authenticity of the identification target 10.
  • the identified object 10 is discharged out of the apparatus through the discharge port 54 by the transport roller 56.
  • the discharged identification object 10 is conveyed, for example, in different directions according to the identification result.
  • the prism 15 provided in the paper sheet identification sensor 1 of the present embodiment has a configuration with improved separation characteristics. Therefore, the spectral spectrum obtained by the paper sheet identification sensor 1 of the present embodiment has improved reliability with respect to the spectrum pattern in red to infrared light, and the paper having a characteristic pattern in this portion. It is also possible to identify the authenticity of leaves.
  • the paper sheet identification sensor 1 In the paper sheet identification sensor 1 according to the first embodiment described above, the paper sheet is identified using the transmitted light obtained when the light to be identified 10 is irradiated from the light source 11a. Therefore, a configuration for obtaining a spectral spectrum is obtained.
  • the present invention is not limited to this configuration.
  • a configuration as shown in FIG. 10 may be used to obtain a spectral spectrum for identifying paper sheets using reflected light obtained when light is irradiated from the light source 11a to the identification target 10. .
  • the light emitted from the LED 11 a serving as the light source is configured to be condensed on the identification target 10 using the condensing lens 19.
  • a configuration without 19 is also acceptable.
  • the paper sheet identification sensor 1 according to the first embodiment irradiates the identification target 10 with white light including infrared light, obtains a spectral spectrum of transmitted light or reflected light from the identification target 10, The configuration enables identification of leaves. However, some paper sheets are printed with fluorescent ink to prevent counterfeiting.
  • FIG. 11 exemplifies a fluorescence spectrum when a special ink that emits fluorescence when irradiated with ultraviolet light is printed on a paper sheet.
  • Paper sheets printed with the special ink shown in FIG. 11 emit fluorescence of two wavelengths when irradiated with specific ultraviolet light. Specifically, a gentle peak in the green region and a sharp peak in the red region are detected.
  • special ink include a mixture of MLCB-12 (Green) and MLCB-13 (Red), which are fluorescent inks of Sinlohi.
  • the spectrum shown with a broken line in FIG. 11 is a spectrum of the white medium used as a reference, and is shown for comparison.
  • the conventional paper sheet identification sensor 100 shown in FIG. 17 has a problem that the separation characteristic is poor in the red to infrared region due to the characteristic of the prism 104. For this reason, the conventional paper sheet identification sensor 100 has a problem that it is difficult to detect a sharp peak in the red region, and accurate identification cannot be performed.
  • the paper sheet identification sensor according to the second embodiment can identify paper sheets that exhibit a characteristic fluorescence spectrum by irradiation with ultraviolet light, including the case where special ink as shown in FIG. 11 is used. This is a sheet identification sensor.
  • the paper sheet identification sensor of the second embodiment will be described with reference to FIG.
  • FIG. 12 is a schematic diagram illustrating the configuration of the paper sheet identification sensor according to the second embodiment.
  • the same reference numerals as those in the first embodiment are attached to members that overlap with the paper sheet identification sensor 1 of the first embodiment. And when there is no need for the explanation, the explanation is omitted.
  • the sheet identifying sensor 2 of the second embodiment includes a light source unit 21, a first ultraviolet transmission filter 22, a condensing lens 12, a collimating lens 13, a slit member 14, A prism 15, a light receiving unit 16, a second ultraviolet transmission filter 23, and a monitor light receiving element 24 are provided.
  • the light source unit 21 includes an LED 21a and a light source substrate 21b on which a circuit for controlling the driving of the LED 21a is formed.
  • the LED 21a is an ultraviolet LED and emits ultraviolet light.
  • a first ultraviolet transmission filter 22 that transmits only ultraviolet light is disposed in the optical path between the LED 21 a and the identification target 10.
  • the condenser lens 12, the collimating lens 13, the slit member 14, the prism 15, and the light receiving unit 16 are arranged on the same side as the light source unit 21 with respect to the identification target 10. Since the configuration of each member is the same as that of the first embodiment, the description thereof is omitted. However, since the fluorescent light emitted from the identification target 10 is received, the design is appropriately changed accordingly.
  • the paper sheet identification sensor 2 of the second embodiment receives fluorescence emitted from the identification target 10 by the light receiving unit 16 and receives a fluorescence spectrum. It is the structure which obtains. For this reason, as in the case of the first embodiment, the light receiving unit (CCD image sensor) 16 cannot be used as a monitor for the light emission quantity of the LED 11a. Therefore, separately from the light receiving unit 16, a monitoring light receiving element 24 for monitoring the light emission amount of the LED 21a is disposed.
  • the monitor light-receiving element 24 is arranged on the opposite side of the light source unit 21 with the identified object 10 as a reference.
  • the monitor light receiving element 24 is constituted by a photodiode.
  • the monitor light receiving element 24 is mounted on the monitor sensor substrate 25.
  • a second ultraviolet transmission filter 23 is disposed in the optical path between the monitor light receiving element 24 and the identification target 10. This is because when the fluorescent light emitted from the identification target 10 enters the monitor light receiving element 24, it is impossible to accurately monitor the light emission amount of the LED 21 a, so that only ultraviolet light is incident on the monitor light receiving element 24. Because.
  • Fluorescence from the identification target 10 is condensed in a spot shape by the condensing lens 12 and converted into parallel light by the collimating lens 13.
  • the parallel light passes through the slit 14a of the slit member 14 and becomes a thin light beam (for example, a light beam having a diameter of about 200 ⁇ m).
  • the light incident on the prism 15 is split, and the split light is received by the CCD image sensor 16.
  • a signal output from the CCD image sensor 16 is processed by the substrate sensor 17 to obtain a fluorescence spectrum.
  • the authenticity of the paper sheet can be identified.
  • the emission surface 15a of the prism 15 is formed in a convex R shape, thereby improving the separation characteristics in the red to infrared region. Therefore, a sharp peak in the red region as shown in FIG. 11 can also be detected, and the authenticity of the paper sheet on which the fluorescent ink having the characteristics as shown in FIG. 11 is printed can be identified.
  • the light source unit 21 and the light receiving unit 16 are arranged on the same side with respect to the identification target 10.
  • the present invention is not limited to this configuration.
  • the positions of the light source unit 21 and the monitor light receiving element 24 may be reversed.
  • a filter that cuts ultraviolet light may be disposed in the optical path between the condenser lens 12 and the collimating lens 13 so as to exclude ultraviolet light from the light reflected by the identification target 10. Absent.
  • the optical member which comprises the paper sheet identification sensor 2 it can be set as the structure which does not use glass and resin of an ultraviolet-light-proof. In other words, in the case where an ultraviolet-resistant glass or resin is used for the optical member constituting the paper sheet identification sensor 2, the above-described filter for cutting off ultraviolet light is not necessary.
  • FIG. 13 is a schematic diagram showing the configuration of the paper sheet identification sensor of the third embodiment.
  • the paper sheet identification sensor 3 of the third embodiment is a sensor having both functions of the paper sheet identification sensor 1 of the first embodiment and the paper sheet identification sensor 2 of the second embodiment.
  • the identified object 10 can be irradiated with white light (including infrared light) to obtain a spectral spectrum of transmitted light, and the identified object.
  • a fluorescent spectrum emitted from the body 10 to be identified can be obtained by irradiating the body 10 with ultraviolet light.
  • the sheet identification sensor 3 of the third embodiment includes a first light source unit 11, a second light source unit 21, a first dichroic mirror 31, a condenser lens 12, and a second dichroic mirror (separating element) 32.
  • the first light source unit 11 is an integrated LED 11a in which a white LED and an infrared LED are combined, and a circuit for controlling the driving of the LED 11a. And a substrate 11b.
  • the second light source unit 21 includes an LED 21a formed of an ultraviolet LED and a light source substrate 21b on which a circuit for controlling driving of the LED 21a is formed.
  • the first dichroic mirror 31 and the second dichroic mirror 32 both reflect ultraviolet light and transmit other light. Since the condensing lens 12, the collimating lens 13, the slit member 14, the prism 15, and the light receiving unit 16 have the same configuration as that of the first embodiment, description thereof is omitted here.
  • the configuration of the monitor light receiving element 24 is the same as that of the second embodiment, but here, in order to make the light quantity of the second light source unit 21 out of the two light source units 11 and 21 constant. used.
  • the first light source unit 11 and the second light source unit 21 are arranged on the opposite side of the light receiving unit 16 with respect to the identification target 10.
  • the present invention is not limited to this, and the first light source unit 11 and the second light source unit 21 may be arranged on the same side as the light receiving unit 16 with the identification target 10 as a reference.
  • an ultraviolet transmission filter that transmits only ultraviolet light is not provided in the optical path between the second dichroic mirror 32 and the monitoring light receiving element 24.
  • an ultraviolet transmission filter is provided at this position. It does not matter even if it is the composition which provides.
  • the operation of the paper sheet identification sensor 3 of the third embodiment will be described.
  • Light white light including infrared light
  • the LED 11 a passes through the first dichroic mirror 31 and enters the identification target 10.
  • the light emitted from the LED 11 a includes an ultraviolet light component
  • the ultraviolet light component is reflected by the first dichroic mirror 31.
  • the light transmitted through the identification target 10 is collected by the condenser lens 12.
  • the light that has passed through the identification target 10 does not include ultraviolet light, and therefore passes through the second dichroic mirror 32.
  • the light condensed by the condensing lens 12 is converted into parallel light by the collimating lens 13 and passes through the slit 14a to become a thin light beam (for example, a light beam having a diameter of about 200 ⁇ m).
  • the light incident on the prism 15 is split and the split light is received by the CCD image sensor 16.
  • a signal output from the CCD image sensor 16 is processed by the substrate sensor 17 to obtain a spectrum of transmitted light.
  • Light emitted from the LED 21 a (light having a center wavelength of about 370 nm, for example) is reflected by the first dichroic mirror 21.
  • Light other than ultraviolet light passes through the first dichroic mirror 31.
  • the light reflected by the first dichroic mirror 31 enters the identification target 10.
  • the identification target 10 When fluorescent ink is printed on the identification target 10, the identification target 10 irradiated with ultraviolet light emits fluorescence.
  • the fluorescence from the identification target 10 is collected by the condenser lens 12.
  • the fluorescence emitted from the identification target 10 basically does not contain ultraviolet light (it may be contained in a slight amount), and thus passes through the second dichroic mirror 32.
  • the ultraviolet light transmitted through the identification target 10 is reflected by the second dichroic mirror 32 and received by the monitor light receiving element 24.
  • Fluorescence transmitted through the second dichroic mirror 32 is converted into parallel light by the collimating lens 13.
  • the parallel light passes through the slit 14a of the slit member 14 and becomes a thin light beam (for example, a light beam having a diameter of about 200 ⁇ m).
  • the light incident on the prism 15 is split, and the split light is received by the CCD image sensor 16.
  • a signal output from the CCD image sensor 16 is processed by the substrate sensor 17, whereby a spectrum of fluorescence emitted from the identification target 10 is obtained.
  • the paper sheet identification sensor 3 configured as described above can be mounted on the same apparatus as the paper sheet identification apparatus 51 shown in FIG. 9 and controlled so that the LEDs 11a and the LEDs 21a are alternately lit. . And according to this, authenticity identification can be performed using both the spectral spectrum of transmitted light of white light (including infrared light) and the spectral spectrum of fluorescence emitted from the identification target 10. become.
  • the separation surface in the red to infrared region is improved by making the emission surface 15a of the prism 15 have a convex R shape. Therefore, accurate discrimination is possible even in the case where there is a characteristic pattern in the red to infrared region in the above-described spectrum of transmitted light and spectrum of fluorescence.
  • FIG. 14 is a diagram showing a reflection spectrum when paper sheets using OVI are irradiated with white light (light emitted from a halogen lamp) while changing the irradiation angle.
  • white light light emitted from a halogen lamp
  • FIG. 14 it can be seen that the peak derived from OVI shifts to the short wavelength side as the irradiation angle of white light is increased.
  • FIG. 15 is a figure for demonstrating that authenticity can be identified about the paper sheets in which OVI is used by irradiating white light with two types of irradiation angles.
  • the paper sheet identification sensor of the fourth embodiment is a sensor used to authenticate a paper sheet on which OVI is used.
  • FIG. 16 is a schematic diagram illustrating a configuration of a paper sheet identification sensor according to the fourth embodiment.
  • the same reference numerals as those in the first embodiment are assigned to members that overlap the paper sheet identification sensor of the first embodiment. And when there is no need for the explanation, the explanation is omitted.
  • the paper sheet identification sensor 4 of the fourth embodiment includes two light source parts 41, 42, three condenser lenses 43, 44, 12, a collimator lens 13, and a slit member 14. And a prism 15, a light receiving unit 16, and two monitor light receiving elements 45 and 47.
  • the light source unit 41 includes an LED 41a and a light source substrate 41b on which a circuit for controlling driving of the LED 41a is formed.
  • the LED 41a is a white LED that emits white light.
  • the light source unit 41 is arranged so that light is incident on the identification target 10 at an incident angle of 0 °.
  • the light source unit 42 is arranged so that light is incident on the identified object 10 at an incident angle of 60 °.
  • the condensing lens 43 condenses the light from the LED 41 a on the identification target 10.
  • the condensing lens 44 condenses the light from the LED 42 a on the identification target 10.
  • the monitor light receiving element 45 receives the light emitted from the LED 41a and transmitted through the identification target 10, and monitors the light emission amount of the LED 41a.
  • the monitor light receiving element 47 receives light emitted from the LED 42a and transmitted through the identification target 10, and monitors the light emission amount of the LED 42a.
  • monitor light receiving elements 45 and 47 are mounted on monitor sensor boards 46 and 48, respectively.
  • the monitor sensor substrates 46 and 48 process signals output from the monitor light receiving elements 45 and 47.
  • the LEDs 41a and 42a are controlled so that the amount of emitted light is constant according to signals from the monitor sensor substrates 46 and 48.
  • the condensing lens 12, the collimating lens 13, the slit member 14, the prism 15, and the light receiving unit 16 are the same members as those in the first embodiment, description thereof is omitted.
  • the condensing lens 12, the collimating lens 13, and the slit member 14 are inclined at an angle of 45 ° with respect to the normal to the identification target 10 (light receiving angle 45 °). It arrange
  • the operation of the paper sheet identification sensor 4 of the fourth embodiment will be described.
  • the operation is the same except that the LED 41a emits light and the LED 42a emits light except that the incident angle of the light incident on the identification target 10 is different. For this reason, only the case where LED41a is light-emitted is demonstrated.
  • the emitted light (white light) from the LED 41a is collected by the condenser lens 43 and forms an image on the identification target 10. Then, the reflected light reflected by the identification target 10 is collected by the condenser lens 12 and enters the collimating lens 13. The light incident on the collimating lens 13 is converted into parallel light and passes through the slit 14a to become a thin light beam (for example, a light beam having a diameter of about 200 ⁇ m).
  • the light incident on the prism 15 is split and the split light is received by the CCD image sensor 16.
  • a signal output from the CCD image sensor 16 is processed by the substrate sensor 17 to obtain a spectral spectrum of the reflected light.
  • the paper sheet identification sensor 4 configured in this way is mounted on an apparatus similar to the paper sheet identification apparatus 51 shown in FIG. Then, the LED 41a and the LED 42a are controlled to be alternately lit. In this way, a spectrum is obtained when the object to be identified 10 is illuminated at two different irradiation angles, and as in the case shown in FIG. 15, the authenticity of the paper sheet using OVI is identified. Can be done.
  • the separation surface in the red to infrared region is improved by making the emission surface 15a of the prism 15 into a convex R shape. For this reason, even when the peak derived from OVI is in the red region, for example, accurate identification is possible.
  • the incident angles of the light incident on the identification target 10 are 0 ° and 60 °.
  • the present invention is not limited to this configuration, and the incident angle can be changed as appropriate.
  • two light sources are arranged to perform authenticity identification.
  • three or more light sources may be arranged.
  • this embodiment although it has set as the structure which acquires a spectral spectrum using reflected light, it is good also as a structure which acquires a spectral spectrum using transmitted light.
  • the paper sheet identification sensor of the present invention is not limited to the embodiment described above. Various modifications can be made without departing from the object of the present invention.
  • the prism included in the paper sheet identification sensor is made of glass.
  • it is not intended to be limited to this configuration, and may be composed of another transparent member, for example, a resin such as polyester.
  • a resin such as polyester.
  • those having no birefringence are preferable.
  • OKPH4 manufactured by Osaka Gas Chemical is preferably used.
  • infrared light may be emitted from at least one of the light sources.
  • infrared light may be emitted from at least one of the light sources.
  • the paper sheet identification sensor of the present invention is used when it is used to identify whether the paper sheet is genuine or fake.
  • the usage application of the paper sheet identification sensor of the present invention is not limited to this, and can be used for, for example, identification for classifying paper sheets.
  • the present invention is a paper sheet that can widely identify paper sheets using a spectral spectrum obtained by spectrally dividing light (transmitted light, reflected light, excited light (fluorescence)) from an object to be identified.
  • An identification sensor is provided. In this sense, a diffraction grating may be used instead of the prism included in the paper sheet identification sensor.
  • the paper sheet identification sensor of the present invention can be suitably applied to a paper sheet identification device used as a security measure.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L’invention concerne un détecteur pour l’identification d’une feuille de papier. Le détecteur comprend une source de lumière qui éclaire un objet, par exemple la feuille de papier à identifier, un prisme quasiment triangulaire qui est disposé à une position où il peut recevoir la lumière de l’objet éclairé par le source de lumière et une partie réceptrice de lumière qui est disposée à une position où elle peut recevoir la lumière séparée par le prisme et qui comporte des éléments récepteurs de lumière disposés sur une ligne. La surface de sortie du prisme de laquelle sort la lumière séparé présente une forme à projection arrondie.
PCT/JP2008/061395 2008-06-23 2008-06-23 Détecteur pour l’identification d’une feuille de papier WO2009157049A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/061395 WO2009157049A1 (fr) 2008-06-23 2008-06-23 Détecteur pour l’identification d’une feuille de papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/061395 WO2009157049A1 (fr) 2008-06-23 2008-06-23 Détecteur pour l’identification d’une feuille de papier

Publications (1)

Publication Number Publication Date
WO2009157049A1 true WO2009157049A1 (fr) 2009-12-30

Family

ID=41444127

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/061395 WO2009157049A1 (fr) 2008-06-23 2008-06-23 Détecteur pour l’identification d’une feuille de papier

Country Status (1)

Country Link
WO (1) WO2009157049A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2284806A2 (fr) * 2009-08-07 2011-02-16 Innovative Technology Limited Validateur de billet de banque
CN102592347A (zh) * 2012-02-24 2012-07-18 湖南丰汇银佳科技有限公司 基于光谱分析技术的钞票鉴伪方法和装置
WO2013027848A1 (fr) 2011-08-25 2013-02-28 グローリー株式会社 Dispositif d'identification d'article papier, guide optique de spectrométrie d'article papier et boîtier de guide optique
JP2014235577A (ja) * 2013-06-03 2014-12-15 日立オムロンターミナルソリューションズ株式会社 紙葉類識別装置および光学センサ装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0954848A (ja) * 1995-08-14 1997-02-25 Shibaura Eng Works Co Ltd 紙幣識別装置
JPH0954849A (ja) * 1995-08-14 1997-02-25 Shibaura Eng Works Co Ltd 紙幣識別装置
JPH0954850A (ja) * 1995-08-14 1997-02-25 Shibaura Eng Works Co Ltd 紙幣識別装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0954848A (ja) * 1995-08-14 1997-02-25 Shibaura Eng Works Co Ltd 紙幣識別装置
JPH0954849A (ja) * 1995-08-14 1997-02-25 Shibaura Eng Works Co Ltd 紙幣識別装置
JPH0954850A (ja) * 1995-08-14 1997-02-25 Shibaura Eng Works Co Ltd 紙幣識別装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2284806A2 (fr) * 2009-08-07 2011-02-16 Innovative Technology Limited Validateur de billet de banque
WO2013027848A1 (fr) 2011-08-25 2013-02-28 グローリー株式会社 Dispositif d'identification d'article papier, guide optique de spectrométrie d'article papier et boîtier de guide optique
CN103765483A (zh) * 2011-08-25 2014-04-30 光荣株式会社 纸张识别装置、纸张分光测定用光导以及光导盒
JPWO2013027848A1 (ja) * 2011-08-25 2015-03-23 グローリー株式会社 紙葉類識別装置及びライトガイドケース
CN103765483B (zh) * 2011-08-25 2016-02-10 光荣株式会社 纸张识别装置
US9335254B2 (en) 2011-08-25 2016-05-10 Glory Ltd. Paper sheet recognition apparatus, light guide and light guide casing for use in spectrometric measurement of paper sheet
CN102592347A (zh) * 2012-02-24 2012-07-18 湖南丰汇银佳科技有限公司 基于光谱分析技术的钞票鉴伪方法和装置
JP2014235577A (ja) * 2013-06-03 2014-12-15 日立オムロンターミナルソリューションズ株式会社 紙葉類識別装置および光学センサ装置
CN104215613A (zh) * 2013-06-03 2014-12-17 日立欧姆龙金融***有限公司 纸张类识别装置以及光学传感器装置

Similar Documents

Publication Publication Date Title
US8331643B2 (en) Currency bill sensor arrangement
EP2481009B1 (fr) Appareil d'authentification pour documents de valeur
US20080173832A1 (en) Valuable paper validator
JP4188111B2 (ja) 紙葉の真偽鑑別装置
US8263948B2 (en) Authentication apparatus for moving value documents
AU2004296413B2 (en) Reflective optical sensor for bill validator
JP2010243363A (ja) 蛍光検知装置
EP1378868A2 (fr) Dispositif et procédé d'authentification de documents
WO2009157049A1 (fr) Détecteur pour l’identification d’une feuille de papier
US20220277607A1 (en) Method and device for examining value documents
JP2004246714A (ja) パールインキ検出装置及びパールインキ検出方法
EP2549445A1 (fr) Unité et procédé de distinction authentique/contrefaçon et capteur de fluorescence
JP6009992B2 (ja) 紙葉類識別装置および光学センサ装置
JP7111494B2 (ja) 光検出センサ、光検出装置、シート類処理装置および光検出方法
JP4163822B2 (ja) 紙葉類用の蛍光検出装置
JP4062200B2 (ja) 紙葉類の鑑別装置および鑑別方法
WO2021193465A1 (fr) Capteur optique et dispositif d'identification de feuille de papier
JP5174496B2 (ja) 光学センサモジュール
JP4074917B1 (ja) 紙葉類識別装置
CN111492637B (zh) 标签剂***
EP1953709A1 (fr) Validateur de documents de valeur
JP4377872B2 (ja) 表面検査装置
JP2007087333A (ja) パールインキ検出装置
WO2017145779A1 (fr) Appareil d'identification de document de valeur, processeur de document de valeur, unité de capteur d'image et procédé de détection de zone d'élément variable optique
WO2009110064A1 (fr) Détecteur optique et prisme de guide d'ondes optiques

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08765796

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 08765796

Country of ref document: EP

Kind code of ref document: A1