JP2008299639A - Paper sheet discriminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet discrimination device including a discrimination sensor which acquires characteristic data of paper sheets with high precision by suppressing variation in reception amount of reflected light from paper sheets being conveyed. <P>SOLUTION: In the paper sheet discriminating device which discriminates paper sheets on the basis of light reception data from an optical detection part for detecting features of paper sheets, the optical detection part includes a first light source for emitting light to a front surface of a paper sheet, a first lens for condensing reflected light reflected by the front surface of the paper sheet, a first light receiving element for receiving light transmitted through the first lens, a second light source for emitting light to the paper sheet, a second lens for condensing reflected light reflected by a rear surface of the paper sheet, and a second light receiving element for receiving light transmitted through the second lens. They are disposed so that a first lens principal surface and a light receiving surface of the first light receiving element have a shine-proof relation to a reflecting surface of the front surface of the paper sheet and a second lens principal surface and a light receiving surface of the second light receiving element have a shine-proof relation to a reflecting surface of the rear surface of the paper sheet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a paper sheet identification apparatus including an identification sensor that suppresses fluctuations in the amount of received light reflected from a paper sheet and obtains characteristic data of the paper sheet with high accuracy.

  In recent years, with the widespread use of high-precision scanners, printers, computers, and other devices, there is a problem that paper such as banknotes, checks, and other securities are forged and misused. It would be desirable to provide a method and apparatus for reliable identification.

  For example, Patent Document 1 proposes a paper sheet identification device that identifies pearl ink printed on a banknote using an identification sensor constituted by an optical sensor and determines the authenticity of the banknote.

  The identification sensor disclosed in Patent Document 1 includes a light emitting element that irradiates red and green light obliquely with respect to the surface of a banknote, and irradiation light that is emitted from the light emitting element and applied to the banknote on the banknote surface. A light receiving element that receives the reflected light reflected in a direction perpendicular to the banknote surface and a light receiving element that receives the light in an oblique direction (equal to the banknote surface at the incident angle of the irradiated light and opposite to the irradiated light) are arranged. The paper sheet identification device provided with this identification sensor is based on the difference in the amount of light received by each light receiving element and the ratio of the amount of green and red light received by each reflected light. It is configured to discriminate between ink and authenticity of the banknote.

  The identification sensor disclosed in Patent Document 1 is advantageous in identifying pearl ink because the greater the amount of light received by the light receiving element, the greater the change in the detected waveform corresponding to the amount of received light detected by the light receiving element. The light-emitting element and the light-receiving element are arranged so that the irradiation angle from the light-emitting element to the bill detection area (the part where the banknote is to be measured) and the reflection angle from the detection area to the light-receiving element are equal. The light is efficiently received by the light receiving element.

  In addition to the above Patent Document 1, various techniques for efficiently irradiating light on the detection area of a banknote or efficiently receiving reflected light from the detection area with a light receiving element have been proposed. It has a plurality of light sources provided along a bill conveyance passage of a bill to be conveyed, and a light receiving element provided along a bill conveyance passage, and a plurality of light sources are provided between the plurality of light sources and the bill conveyance passage. Proposed is a bill validator configured to suppress loss of irradiation light by providing the optical sensor with a substantially funnel-shaped first light guide that condenses emitted light and radiates it toward the bill conveyance path. Has been.

Further, for example, in Patent Document 3, a light source that emits light toward the detection area of the conveyance path and a fluorescence generated from the object by the light emitted from the light source arranged so as to face the light source across the detection area. The photo sensor for receiving light and an optical lens for condensing the light receiving range of the photo sensor to the detection area side between the photo sensor and the detection area are configured to suppress loss of the received light amount. A fluorescence detection device has been proposed.
JP 2006-146321 A JP 2002-260051 A JP 2005-215784 A

  By the way, as in the above-mentioned proposed Patent Document 1, generally, simply illuminating a paper sheet with light emitting elements and detecting reflected light from the paper sheet generally irradiates the detection area of the paper sheet. There is a case where the intensity of light varies, or the distribution of received light intensity varies due to variations in detection sensitivity of the light receiving element.

  Further, when the irradiation light is condensed on the detection region of the paper sheet using a funnel-shaped light guide or an optical lens for condensing light as in Patent Document 2 and Patent Document 3, When the intensity distribution becomes a peak point on the light condensing surface of the paper sheet, only some features of the detection area are emphasized and detected, and when the collected reflected light is received by the light receiving element, the detection area Since the outside reflected light is also received and detected, the characteristics of the measured detection region may not be detected accurately.

  Further, as in Patent Documents 1 to 3, when the reflected light is simply received by the light receiving element, or when the light is collected and received by a funnel-shaped light guide member or lens, it is transported along the transport path. If the distance from the paper sheet to the light receiving element fluctuates according to the flutter of the paper sheet, the problem remains that the amount of light received from the paper sheet received by the light receiving element increases or decreases and becomes unstable. .

  Accordingly, the present invention provides a paper sheet identification device including an identification sensor that suppresses fluctuations in the amount of received reflected light from a conveyed paper sheet and obtains characteristic data of the paper sheet with high accuracy. With the goal.

  In order to achieve the above object, the invention of the paper sheet identification apparatus according to claim 1 comprises a paper sheet transporting means for transporting a paper sheet along a transport path, and an optical detection unit for detecting characteristics of the paper sheet. A paper sheet identification device for identifying a paper sheet based on light reception data from the optical detection unit, wherein the optical detection unit is a surface of the paper sheet conveyed by the paper sheet conveying means A first light source disposed at a predetermined angle to irradiate light on the surface of the paper sheet, a first lens for collecting reflected light reflected on the surface of the paper sheet, A first light receiving element that receives light transmitted through the first lens and a back surface of the paper sheet conveyed by the paper sheet conveying unit are disposed at a predetermined angle, to the paper sheet A second light source for irradiating light, a second lens for condensing the reflected light reflected by the back surface of the paper sheet, and the second lens A second light receiving element for receiving light transmitted through the window, and the first lens main surface and the first lens with respect to the reflection surface of the surface of the paper sheet irradiated with light from the first light source. The light receiving surface of one light receiving element is disposed so as to have a Scheinproof relationship, and the second lens main surface and the reflective surface on the back surface of the paper sheet irradiated with light from the second light source The light receiving surface of the second light receiving element is arranged so as to have a Scheinproof relationship.

  According to a second aspect of the present invention, there is provided the paper sheet identification device according to the first aspect, wherein the optical detection unit detects the characteristics of the paper sheet having a hue ink print region in which the hue changes depending on the viewing angle. The first light source and the second light source have light of a plurality of colors and reflect light reflected from the first light source reflected by the surface of the paper sheet. Reflected by the third lens that collects light in the direction perpendicular to the surface of the paper sheet, the third light receiving element that receives the light transmitted through the third lens, and the back surface of the paper sheet A fourth lens that condenses the reflected light of the light from the second light source in a direction perpendicular to the back surface of the paper sheet; and a fourth light receiving element that receives the light transmitted through the fourth lens. And, when a plurality of light from the first light source is irradiated onto the hue ink printing region of the paper sheet The hue ink based on the light reception output of the first light receiving element or the light reception output of the second light receiving element when a plurality of lights from the second light source are irradiated onto the hue ink printing region of the paper sheet. First calculation means for calculating a first hue depending on a print area, and the third light receiving element when a plurality of lights from the first light source are irradiated to the hue ink print area of the paper sheet Light receiving output of the fourth light receiving element when a plurality of light from the second light source is applied to the hue ink printing area of the paper sheet, and the second ink does not depend on the hue ink printing area. A second calculation unit that calculates a hue of 2, and a paper sheet determination unit that determines the paper sheet based on the calculation results of the first calculation unit and the second calculation unit. Features.

  According to a third aspect of the present invention, the first light source and the second light source include an irradiation light path, and a scattering reflection surface is provided on an inner wall of the irradiation light path. It is characterized by having.

  According to a fourth aspect of the present invention, there is provided a paper sheet identification apparatus according to the first aspect, wherein the image of the detection region on the surface of the paper sheet and the size of the image formed on the light receiving surface of the first light receiving element are used. The first lens is arranged to have the same size, and the size of the image of the detection area on the back surface of the paper sheet and the image formed on the light receiving surface of the second light receiving element are the same size. The second lens is disposed so that the first slit is disposed immediately before the first light receiving element, and a first slit that restricts the detection area of the sheet is disposed, and the paper sheet is disposed immediately before the second light receiving element. A second slit for restricting the detection area is arranged.

  According to a fifth aspect of the present invention, there is provided a paper sheet identification device according to the first aspect of the present invention, wherein a portion of the transport path where the optical detection unit is disposed has a width in the vertical direction with respect to the paper sheet. It is characterized by being formed narrower than the road.

  According to a sixth aspect of the present invention, there is provided the paper sheet identification device according to any one of the first to fifth aspects, wherein the first lens, the second lens, the third lens, and the fourth lens. Is a spherical lens, wherein the first light receiving element and the second light receiving element are arranged perpendicular to the transport path of the paper sheet.

  According to the paper sheet identification apparatus of the present invention, the first light intensity distribution is uniform in the detection areas on the front surface and the back surface of the paper sheet transported along the transport path by the paper sheet transport unit. Since the light from the light source and the second light source is irradiated, the reflected light of the detection region of the light is condensed by the lens and imaged on the light receiving surface of the light receiving element, and the received light data corresponding to the amount of received light is obtained. It suppresses that only some features of the detection area of the paper sheet are emphasized and detected, and prevents light reflected outside the detection area of the paper sheet from entering the light receiving element. Only the features of the detection area can be detected as if the light receiving elements were directly arranged in the upper detection area.

  Further, as in Patent Documents 1 to 3, the light receiving element is used to receive the reflected light, or the light is collected and received by a funnel-shaped light guide member or lens. The fluctuation of the amount of light received when the distance from the detection area of the paper sheet to each light receiving element fluctuates due to the flickering of the paper sheet being conveyed is suppressed, and the characteristic data of the paper sheet is acquired with high accuracy. be able to.

  Further, the portion where the optical detection unit on the conveyance path for conveying the paper sheet by the paper sheet conveying means is formed so that the vertical width with respect to the paper sheet is narrower than the other conveyance paths. Fluctuations in the amount of light received by the light-receiving element due to fluctuations in the distance from the detection area of the paper sheet to each light-receiving element are reduced, and paper sheet characteristic data is controlled. Is obtained with high accuracy, and there is an effect that the identification accuracy of paper sheets is improved.

  In addition, the first lens, the second lens, the third lens, and the fourth lens are spherical lenses, and the first light receiving element and the second light receiving element are perpendicular to the paper sheet conveyance path. As a result, the assembly of the optical detection unit can be facilitated, the mounting accuracy of the light receiving element and the lens can be increased, and the entire optical detection unit can be reduced in size.

  Hereinafter, an embodiment of a paper sheet identifying apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram schematically showing a configuration example of a main part of a paper sheet identification apparatus 100 according to the present invention.

  As shown in FIG. 1, the paper sheet identification device 100 includes a microcomputer 60, an optical detection unit 30 (a portion surrounded by a one-dot chain line), and a banknote transport mechanism 40 (a portion surrounded by a broken line in the drawing). The microcomputer 60 performs overall control of the entire paper sheet identification apparatus 100.

  The optical detection unit 30 is an identification sensor that obtains the characteristic data of the pearl ink printed on the genuine banknote according to the present invention with high accuracy, and is inserted from a banknote insertion slot (not shown) of the paper sheet identification apparatus 100. The front and back surfaces of the banknote 130 (hereinafter referred to as “inserted banknote 130”) transported by the transport mechanism 40 are sequentially irradiated with red light and green light, and the irradiated light is reflected and transmitted by the inserted banknote 130. Light reception data corresponding to each amount of transmitted light is detected.

  The optical detection unit 30 is a main part of the present invention configured to acquire the characteristic data of the pearl ink printed on the genuine banknote with high accuracy, and details of the optical detection unit 30 will be described later.

  The banknote transport mechanism 40 is a paper sheet transport unit that transports the banknote 130 inserted from the banknote insertion slot of the paper sheet identification apparatus 100 along the transport path 80.

  Although not shown in FIG. 1, the paper sheet identification apparatus 100 includes a magnetic and optical sensor 49 (FIG. 2) that includes a magnetic sensor, a reflective optical sensor, and a transmissive optical sensor, in addition to the optical detection unit 30. Each of the bill insertion detection sensors 47 (see FIG. 2) is disposed at a predetermined position of the paper sheet identification device 100, and the magnetic and optical sensor 49 receives the magnetic data and the received light data of the inserted bill 130. It detects and specifies the denomination and insertion direction (the front and back of the insertion banknote 130, the normal / reverse direction).

  The operation of each sensor described above will be briefly described. For example, when a bill 130 is inserted into the paper sheet identification device 100, the bill insertion detection sensor 47 detects this, and based on the detection result, the bill transport mechanism 40 is operated. Driving is started and the bill is conveyed into the apparatus. Further, the magnetic and optical sensor 49 including the magnetic sensor, the reflection type optical sensor, and the transmission type optical sensor, and the optical detection unit 30 acquire the magnetic data and the light reception data of the inserted banknote 130.

  Various methods for identifying the authenticity of banknotes based on the detection results of the magnetic and optical sensors 49 have been proposed as known banknote identification methods. The banknote identification method is the key to the paper sheet identification apparatus 100 according to the present invention. Since it is not a part, it is omitted.

  In this embodiment, for the sake of convenience of explanation, the transmissive optical sensor 49 and the reflective optical sensor 49 are provided separately from the optical detection unit 30, but the transmissive optical sensor and the reflective optical sensor are provided. It is good also as a structure which combines the detection of the light reception data of the inserted banknote 130 by a sensor with the transmission type optical sensor which the optical detection part 30 comprises, and a reflection type optical sensor.

  The microcomputer 60 constituting the paper sheet identification apparatus 100 includes a control unit 51, a denomination and insertion direction determination unit 52, a received light data correction unit 53, a watermark area data specification unit 54, and a pearl data determination unit 55. The watermark data determination unit 56 and the memory 57 are provided. The memory 57 reflects each of the two colors (red and green) on each side (front and back) of the inserted bill 130 detected by the optical detection unit 30. Receiving data of light and transmitted light, reflected light and transmitted light of each surface of the inserted bill 130 detected by the magnetic and optical sensor 49 (see FIG. 2), and detected magnetic magnetic data, A set watermark area data address reference table, various reference tables and reference data such as a pearl ink printing unit data address reference table, and various processing programs are stored.

  The watermark area data address reference table stores the received light data of the watermark area of each genuine banknote when the genuine banknote for each denomination is inserted into the paper sheet identification device 100 in the front and back insertion direction. The address information of the start point and end point of the area (memory 57) is set in advance so that it can be referred to corresponding to the denomination and insertion direction of the genuine banknote.

Further, in the pearl ink printing unit data address reference table, as in the watermark region data address reference table, a genuine banknote for each denomination is inserted into the paper sheet identification apparatus 100 in the front and back and the reverse insertion direction respectively. The address information of the start and end points of the storage area (memory 57) in which the received light data of the area where the pearl ink of each genuine banknote is printed (hereinafter referred to as “pearl ink printing section”) is the denomination of the genuine banknote. It is set in advance so that it can be referred to corresponding to the insertion direction.
The denomination and insertion direction determination unit 52 determines the denomination and insertion direction of the inserted banknote 130 based on the magnetic data of the inserted banknote 130 detected by the magnetic and optical sensor 49 and the received light data of transmitted light and reflected light. I do.

  The received light data correction unit 53 sets a maximum received light amount, which will be described later, based on received light data corresponding to each received light amount of reflected light of two colors (red and green) of the watermark area acquired from the inserted banknote 130 by the optical detection unit 30. It detects and correct | amends with respect to all the reflected light data of the insertion banknote 130 detected by the optical detection part 30 based on this maximum received light quantity.

  Specifically, the amount of received light of the reflected light (hereinafter referred to as “red reflected light”) when the optical detection unit 30 irradiates the watermark area of the inserted banknote 130 with the red light and the green light is irradiated. The maximum received light amount that maximizes the sum of the reflected light (hereinafter referred to as “green reflected light”) and the received light amount is detected, and the maximum received light amount is corrected to a predetermined specified value. Corresponding to the correction, all the reflected light data of the inserted banknote 130 detected by the optical detection unit 30 is corrected.

  The received light data of the watermark area of the inserted banknote 130 is read from the memory 57 by the watermark area data specifying section 54 based on the denomination and insertion direction determination result of the inserted banknote 130 determined by the denomination and insertion direction determining section 52. It is.

  The watermark area data specifying unit 54 refers to the watermark area data address reference table based on the denomination and insertion direction of the inserted banknote 130 determined by the denomination and insertion direction determining unit 52, and receives the received data of the watermark area of the inserted banknote 130. Is stored, and the received light data of the watermark area of the inserted banknote 130 is read therefrom.

  The pearl data determination unit 55 is inserted based on the color of the ink in each detection area of the inserted banknote 130 obtained from the correction data obtained by correcting the reflected light data of each color by the light reception data correction unit 53, the pearl ink component, and the determination criteria. The authenticity of the banknote 130 is determined.

  Specifically, a pearl ink printing section is formed on one side of the banknote determined by the paper sheet recognition apparatus 100 according to the present invention as a genuine banknote, and the pearl ink in the pearl ink printing section is a hue ink. It is a kind of ink that makes a translucent pattern with pearly luster emerge depending on the viewing angle. It is an ink that reflects in a special color when light of a specific wavelength is irradiated at a specific angle.

  The color of this pearl ink varies depending on the type of pearl ink (difference between manufacturers, etc.), but the pearl ink printed on the genuine banknote in this embodiment is specifically designed to turn the genuine banknote into the genuine banknote surface. On the other hand, it is printed as a pearl ink printing part on one side of a genuine banknote so that it looks colorless (it appears to be unprinted) when viewed from the vertical direction and looks pink when viewed from an oblique direction.

  As a result of irradiating light of each wavelength to the pearl ink printing part of this genuine banknote and measuring the reflected light, the red bank was irradiated with red light at an oblique angle, and the reflected light was received obliquely. However, the amount of reflected light from the pearl ink printed part is significantly larger than the reflected light from other plain parts, and the amount of reflected light when irradiated with green light is different from that of the pearl ink printed part. The inventors of the present application have obtained an experimental result that is almost the same as that of the plain part.

  From this, the pearl data determination unit 55 identifies the color of the ink at each measurement position on each side of the inserted banknote 130, and the inserted banknote 130 is based on the delicate characteristics of the pearl ink in the pearl ink printing section of the genuine banknote. Accurately identify the printed pearl ink.

  The watermark data determination unit 56 determines the authenticity of the inserted banknote 130 based on the received light data of the watermark area of the inserted banknote 130 specified by the watermark area data specifying unit 54.

  The optical detection unit 30 has a light source 1 (first light source), a ball lens 4 (first lens), and a light receiving element 5 (first light reception) on the upper side of the inserted banknote 130 conveyed by the banknote conveyance mechanism 40. Element) and a light source 8 (second light source), a spherical lens 11 (second lens), and a light receiving element 12 (second light receiving element) on the lower side, and a light source 1 (first light source). Are connected to the microcomputer 60 via the amplifier 2 and the D / A converter 3, and the light source 8 (second light source) is connected to the microcomputer 60 via the amplifier 9 and the D / A converter 10.

  A digital command signal from the control unit 51 of the microcomputer 60 to each light source is converted into an analog command signal by each D / A converter, and an increase / decrease control of the current that each amplifier passes to each light source based on the converted command signal. And the light emission amount of each light source is adjusted.

  The light receiving element 5 (first light receiving element) is connected to the microcomputer 60 via the amplifier 6 and the A / D converter 7, and the light receiving element 12 (second light receiving element) is connected to the amplifier 13 and the A / D. The light receiving element is connected to the microcomputer 60 via the converter 14, and each light receiving element outputs an electric signal having a signal level corresponding to the amount of received reflected light or transmitted light, and the electric signal output from each light receiving element. Is amplified by each amplifier, converted into light reception data of a digital signal by each A / D converter, and then stored in a predetermined storage area of the memory 57 of the microcomputer 60 via the bus 70.

Each light source is, for example, an LED (= Light Emitting Diode) that emits light of two colors (red and green), and a red light source is arranged vertically on the pearl ink printing portion formed on the inserted banknote 130 to reflect light. The light source and the light receiving element are arranged so that the amount of received light increases compared to the amount of received light when the light is received substantially vertically. (In the present embodiment, a light source (LED) that emits light of two colors (red and green) and a light receiving element are arranged at 45 degrees with respect to each bill.)
Specifically, the light reflected from the surface of the inserted banknote 130 by the irradiation light from the light source 1 (first light source) is collected by the ball lens 4 (first lens), and then the light receiving element 5 (first light source). The light reflected by the back surface of the inserted bill 130 by the light irradiated from the light source 8 (second light source) is collected by the ball lens 11 (second lens) and then received by the light receiving element 12. Light is received by the (second light receiving element).

  Further, the light source 1 (first light source) and the spherical lens 11 (second lens) are arranged to face each other, and the light source 8 (second light source) and the spherical lens 4 (first lens) face each other. The transmitted light through which the irradiation light from the light source 1 (first light source) passes through the inserted banknote 130 is condensed by the ball lens 11 (second lens), and then the light receiving element 12 (second light receiving). The light received by the light source 8 (second light source) is collected by the spherical lens 4 (first lens), and then the light receiving element 5 (first light received). Element).

  In this embodiment, each light emitting element that emits visible light is arranged. However, in addition to visible light, a light emitting element that emits light of any wavelength of infrared or ultraviolet may be arranged. Good.

  By the way, the optical detection unit 30 according to the present invention suppresses fluctuations in the amount of reflected light from the inserted banknote 130 conveyed by the banknote transport mechanism 40, and acquires the characteristic data of the pearl ink of the inserted banknote 130 with high accuracy. Thus, the following (1) to (4) are configured so as to improve the accuracy of banknote recognition by the paper sheet recognition apparatus 100.

  (1) The light irradiated to the inserted banknote 130 from each light source (the light source 1 (first light source) and the light source 8 (second light source)) of the optical detection unit 30 is to detect the detection area of the inserted banknote 130 (measurement of banknotes). (Part) is configured to be irradiated evenly.

  Specifically, each light source (light source 1 (first light source) and light source 8 (second light source)) of the optical detection unit 30 has, for example, an LED that emits light of two colors (red or green) in diameter. 4.8 mm cylindrical irradiation light path 31 (first irradiation light path) and a cylindrical irradiation light path 31 (first irradiation light path) which are arranged in the irradiation light path 32 (second irradiation light path) and in which the LEDs are arranged. ) And the surface of the irradiation light path 32 (second irradiation light path) is roughened (a scattering reflection surface, for example, the tap of M6 is cut), thereby emitting light of each color (red or green) emitted by the LED. It is configured such that the intensity distribution of each light that is scattered in the cylinder and emitted from the cylinder in which each LED is arranged is uniform in the detection region of the inserted banknote 130.

  (2) If the distance from the inserted banknote 130 to each light receiving element fluctuates due to the fluctuation of the inserted banknote 130 conveyed along the transport path 80 in the optical detection unit 30, the amount of light received by the light receiving element is unstable. It is configured not to be.

  Specifically, the width of the conveyance path 80 in which the optical detection unit 30 is arranged (the width in the vertical (up and down) direction with respect to the conveyance direction of the inserted banknote 130 is, for example, 1 mm) is the width of the conveyance path 80 in other parts (for example, It is configured to be narrower than 2 millimeters) and to restrict folding and wrinkling of the inserted banknote 130 and flapping in the transport path 80 of the inserted banknote 130, and the inserted banknote 130 is transported in the center of the transport path 80.

  Further, (3) a surface obtained by extending each surface of the inserted bill 130 surface (reflection surface), the lens main surface of the ball lens 4 (first lens), and the light receiving surface of the light receiving element 5 (first light receiving element) is one. In addition, the back surface of the inserted bill 130, the lens main surface of the ball lens 11 (second lens), and the light receiving element 12 (second light receiving element) receive light so as to coincide on the straight line (point P in the figure). Each spherical lens and each light receiving element are arranged so that the surface obtained by extending each surface coincides on one straight line (point Q in the figure), and the detection area of the inserted banknote 130, the lens main surface, The light receiving element is in a shine proof relationship.

  When arranged in this way, the reflected light of the inserted banknote 130 is collected by each spherical lens even if the main surface of each spherical lens and each light receiving element are not arranged so as to be parallel to the inserted banknote 130. An image can be formed on the light receiving surface of the light receiving element, and fluctuations in the amount of light received due to fluttering of the inserted banknote 130 can be suppressed. Further, the problem that reflected light from an unnecessary portion outside the detection region is detected by the light receiving element is solved. Moreover, the focal distance of the reflected light of the insertion banknote 130 can be shortened by making each lens into each ball lens, and it is comprised so that the optical detection part 30 can be reduced in size.

  (4) The light receiving elements are arranged so that the angles formed by the front and back surfaces (reflection surfaces) of the inserted banknote 130 and the light receiving surfaces of the light receiving elements are 90 degrees, respectively, and images on the light receiving surfaces of the light receiving elements are inserted. A spherical lens is arranged so as to be the same size as the irradiation surface of the banknote 130, and the detection area is limited by the slit 26 (first slit) and the slit 27 (second slit) to receive light. The optical calculation based on the detection result and the assembly of the optical detection unit 30 are facilitated.

  In addition, if it arrange | positions so that a spherical lens main surface may become 45 degree | times with respect to each surface (reflection surface) of the insertion banknote 130, and also arrange | position so that a spherical lens and a light receiving element may become 45 degree | times, Placement positioning becomes easier.

  Further, since the spherical lens is not oriented like other convex lenses, it is easy to mount and position the lens.

  The banknote transport mechanism 40 includes a transport belt 44 that transports the inserted banknote 130 inserted from the banknote insertion slot, a roller 42 and a roller 43 that support the transport belt 44, and a rotation direction, a rotation speed, and a rotation of the roller 42 or the roller 43. A transport motor 41 is provided that can control the number and the like to move the transport belt 44 in a desired direction at a desired transport speed by a desired transport distance.

  The transport motor 41 performs drive control of the roller 42 or the roller 43 based on a command signal from the control unit 51 of the microcomputer 60.

  The control unit 51 performs overall control of the paper sheet identification apparatus 100, and exchange of data signals, control signals, and the like between the units of the paper sheet identification apparatus 100 is performed by the control unit 51 of the microcomputer 60 via the bus 70. This is performed based on the command signal.

  FIG. 2 shows a circuit configuration of a main part of the present invention of the paper sheet identification apparatus 100 configured as described above.

  FIG. 2 is a circuit block diagram schematically showing an example of the circuit configuration of the paper sheet identification device 100. As shown in FIG. 2, the optical detection unit 30 (one-dot chain line) constituting the paper sheet identification device 100 is shown. The circuit configuration of the portion surrounded by (3) is composed of an LED (R) that emits red light and an LED (G) that emits green light on the upper side perpendicular to the conveyance path 80 in the optical detection unit 30. A light source 1 (first light source) and a light source 8 (second light source) composed of an LED (R) that emits red light and an LED (G) that emits green light are arranged on the lower side. The LED (R) of the light source 1 (first light source) is connected to the microcomputer 60 via a D / A converter 3R and an amplifier circuit 2R capable of increasing / decreasing the current flowing through the LED (R). (G) is a D / D capable of increasing / decreasing the current flowing through the LED (G). And it is connected to the microcomputer 60 via the converter 3G and amplifier circuit 2G.

  The LED (R) of the light source 8 (second light source) is connected to the microcomputer 60 via a D / A converter 10R capable of increasing / decreasing the current flowing through the LED (R) and an amplifier circuit 9R. (G) is connected to the microcomputer 60 via a D / A converter 10G capable of increasing / decreasing the current flowing through the LED (G) and an amplifier circuit 9G.

  The light receiving element 5 (first light receiving element) is connected to the microcomputer 60 via the A / D converter 7 and the amplifier circuit 6, and the light receiving element 12 (second light receiving element) is connected to the A / D converter 14 and the amplifier. It is connected to the microcomputer 60 through the circuit 13.

  Each light receiving element outputs an electric signal corresponding to each received light amount of the reflected light and transmitted light received, and the electric signal output from each light receiving element is amplified by each amplifier circuit corresponding to each light receiving element, It is converted into a digital signal by each A / D converter corresponding to each amplifier and stored in the memory 57 of the microcomputer 60.

  A transport motor 41 that controls transport of the inserted banknote 130 is connected to the microcomputer 60 and controls the driving of the roller 42 or the roller 43 of the banknote transport mechanism 40 based on a command signal transmitted from the control unit 51 of the microcomputer 60. .

  In addition, an encoder 45 is connected to the conveyance motor 41, and the encoder 45 is connected to a microcomputer 60 via an amplifier circuit 46, and an amplifier circuit 46 outputs a pulse signal encoded corresponding to driving of the conveyance motor 41. Is amplified and output to the microcomputer 60.

  The bill insertion detection sensor 47 is connected to the microcomputer 60 via the amplifier circuit 48, detects the bill 130 inserted in the paper sheet identification device 100, amplifies the detection signal by the amplifier circuit 48, and sends it to the microcomputer 60. Output.

  Also, the paper sheet identification device 100 includes a magnetic sensor that detects the magnetism of the inserted banknote 130, a transmissive optical sensor that detects the transmitted light of the light irradiated on the inserted banknote 130, and a reflected light that detects reflected light. Magnetic and optical sensors 49 such as sensors are connected to the microcomputer 60 via the amplifier circuit 50, and magnetic data and light reception data detected by these sensors are amplified by the amplifier circuit 50 and input to the microcomputer 60. The microcomputer 60 is configured such that the inserted banknote 130 can be identified by a known banknote identification method based on the input data.

  A method for discriminating the authenticity of the inserted banknote 130 based on the characteristic data of the inserted banknote 130 detected with high accuracy by the optical detection unit 30 will be described below.

  FIG. 3 is a diagram illustrating an example of a configuration of the genuine banknote 110 that the paper sheet identifying apparatus 100 identifies as a genuine banknote and a waveform signal corresponding to the characteristic data detected by the optical detection unit 30 from the genuine banknote 110.

  3, FIG. 3 (a) is a diagram showing an example of the configuration of the genuine banknote 110 according to the present invention, and FIG. 3 (b) is a light source 1 (first light source) or a light source 8 (second light source). FIG. 3C is a diagram showing a waveform signal corresponding to the received light output of the reflected light detected from the genuine banknote 110 when red is emitted in red or green, and FIG. 3C is a diagram of the red reflected light shown in FIG. It is a figure which shows the waveform signal of the ratio of the light reception output of the green reflected light with respect to a light reception output.

  In FIG. 3B and FIG. 3C, the signal waveform of the light reception output detected at the portion where the pattern of the genuine banknote 110 is printed corresponds to the change in the color of the printed pattern of the genuine banknote 110. Although this part changes, since this part is not a main part of the present invention, the detailed signal waveform of the light receiving output of the part on which the pattern of the genuine banknote 110 is printed is omitted, and for convenience of explanation, the hatching pattern is omitted. It is shown as a rectangle.

  As shown in FIG. 3A, in the genuine banknote 110 according to the present invention, a watermark region 113 is formed near the center of the genuine banknote 110, and the pearl ink printing unit 111 and the pearl ink are formed at both ends in the longitudinal direction of the genuine banknote 110. The authentic banknote 110 in which the printing unit 112 is formed and is inserted into the paper sheet identification apparatus 100 is transported along the transport path 80 by the banknote transport mechanism 40 in a predetermined transport direction (arrow direction in the figure). .

  In addition, each pearl ink printing part formed in the both ends of the genuine banknote 110 is printed only on the single side | surface of the genuine banknote 110. FIG.

  When the genuine banknote 110 is transported into the optical detection unit 30 along the transport path 80, the width of the transport path 80 in the optical detection unit 30 (width in the vertical (up and down) direction with respect to the transport direction of the inserted banknote 130) is different. Since the width (for example, 1 mm) is narrower than the width (for example, 2 mm) of the conveyance path 80 in this portion, the folding and fold of the genuine banknote 110 and the fluttering of the genuine banknote 110 are regulated, and the conveyance path 80 It is conveyed along the center.

  Further, when the genuine banknote 110 is conveyed into the optical detection unit 30, the control unit 51 of the microcomputer 60 includes the light source 1 (first light source) and the light source 8 (second light source) arranged in the optical detection unit 30. ) And the light receiving element 5 (first light receiving element) and the light receiving element 12 (second light receiving element), the reflected light of each color (red, green) at each measurement position on each surface (front surface and back surface) of the genuine banknote 110 and Control is performed to measure the amount of received light and to collect each received light value of each received light output value (reflected light data or transmitted light data) corresponding to each measured received light amount.

  Specifically, each color (red, green) LED of the light source 1 (first light source) is sequentially emitted with respect to the genuine bill 110 conveyed into the optical detection unit 30 to detect each detection area on the surface of the genuine bill 110. Are uniformly irradiated with light of the emission color, and the reflected light of the genuine banknote 110 for each emission color is condensed by the ball lens 4 (first lens) to be received on the light receiving surface of the light receiving element 5 (first light receiving element). The light is imaged and received, and the transmitted light is condensed by the spherical lens 11 (second lens) and imaged on the light receiving surface of the light receiving element 12 (second light receiving element) to receive and correspond to each received light amount. Each received light output value (reflected light data and transmitted light data) is collected as received light data.

  Further, each color (red, green) LED of the light source 8 (second light source) is caused to emit light sequentially to irradiate each detection area on the back of the genuine banknote 110 with light of the emission color, and the authentic banknote 110 for each emission color. Is reflected by the spherical lens 11 (second lens) and imaged on the light receiving surface of the light receiving element 12 (second light receiving element) to receive the light, and the transmitted light is received by the spherical lens 4 (first lens). ) To form an image on the light receiving surface of the light receiving element 5 (first light receiving element), receive the light, and receive the respective light receiving output values (reflected light data and transmitted light data) corresponding to the respective light receiving amounts. Collect as.

  In this way, the detection area on the surface of the genuine banknote 110 is evenly irradiated with light of the emission color, and the reflected light is collected by the spherical lens and imaged on the light receiving surface of the light receiving element, and the light receiving data corresponding to the amount of light received. Since the characteristic data of the genuine banknote 110 can be acquired with high accuracy as if the light receiving element is directly arranged in the detection area on the surface of the genuine banknote 110, the reflected light from the unnecessary part outside the detection area can be obtained. The problem of being detected by the light receiving element is solved.

  As shown in FIG. 3B, the received light data collected from the surface on which the pearl ink printing part of the genuine banknote 110 is formed by the above method is the received light data of the red reflected light of the genuine banknote 110 by red light emission. Collected by the waveform signal 120, the received light data of the green reflected light of the genuine banknote 110 by green light emission is collected by the waveform signal 121.

  When the red light is irradiated on the genuine banknote 110, the waveform signal 120 is a received light output of reflected light (red reflected light) from the light of the genuine banknote 110, and each pearl ink printing part of the genuine banknote 110 is a watermark area 113. Is larger in the red print area of the other areas, smaller in the black print area, and smaller in the black print area, and shows a characteristic that a light reception output corresponding to each color printed on the genuine banknote 110 can be obtained. .

  Moreover, the light reception output of the red reflected light in each pearl ink printing part of the genuine banknote 110 shows the characteristic that it is remarkably large compared with the light reception output of the red reflected light of another area | region.

  The waveform signal 121 indicates that when the genuine banknote 110 is irradiated with green light, the received light output of the reflected light (green reflected light) from the light of the genuine banknote 110 is the pearl ink printing unit and the watermark area 113 of the authentic banknote 110. The green light receiving output of each pearl ink printing portion is smaller than the light receiving output of red reflected light.

  Further, it shows a characteristic that a light receiving output corresponding to each color printed on the genuine banknote 110 can be obtained, which is large in the green printing region of other regions and small in the black printing region.

  Based on the waveform signal 120 and the waveform signal 121 showing such characteristics, the ratio of the received light output value of the green reflected light to the received light output value of the red reflected light at each measurement position of the genuine banknote 110 (hereinafter referred to as “red-green ratio (oblique light)”. ”), A waveform signal 122 as shown in FIG. 3C is obtained.

  The waveform signal 122 shown in FIG. 3C indicates that the red-green ratio (oblique light) 122-a and 122-b of each pearl ink printing portion of the genuine banknote 110 is the red-green ratio (oblique light) of the plain area of the watermark region 113. ), And a characteristic value that is smaller than the red color of the genuine banknote 110 can be obtained from the red-green ratio (oblique light) of the green reflected light to the red reflected light of the genuine banknote 110.

  As described above, the paper sheet identification device 100 according to the present invention regulates the folding and wrinkling of the inserted banknote 130 conveyed in the optical detection unit 30 and the flickering of the up and down swing of the inserted banknote 130. The detection area at each measurement position is evenly irradiated with light of the emission color of each light source, and the reflected light is collected by a spherical lens and imaged on the light receiving surface of the light receiving element. Can be obtained with high accuracy.

  As described above, the paper sheet recognition apparatus 100 according to the present invention suppresses fluctuations in the amount of received light reflected from the inserted banknote 130 conveyed into the optical detection unit 30, and receives light in the detection area of the inserted banknote 130. Data can be acquired with high accuracy.

  In addition, the red / green ratio is calculated based on the received light data of the inserted banknote 130 obtained with high accuracy by the configuration of the optical detection unit 30, and the color depending on the pearl ink of the pearl ink printing unit printed on the inserted banknote 130 is included. In order to obtain information, the pearl printed on the inserted banknote 130 with respect to the inserted banknote 130 inserted in the paper sheet identification device 100 is different from the hue ink discrimination method based on the light reception output of each individual reflective optical sensor. More accurate authenticity determination can be performed based on the determination result of the delicate characteristics of the ink.

  A paper sheet identification apparatus 101 according to the present invention having a configuration different from that of the paper sheet identification apparatus 100 described so far will be described below.

  FIG. 4 is a block diagram showing an example of a paper sheet identification apparatus 101 according to the present invention having a configuration different from that of the paper sheet identification apparatus 100, and FIG. 5 is an example of a circuit configuration of the paper sheet identification apparatus 101. It is the circuit block diagram which showed.

  4 and 5, each part of the paper sheet identification device 101 having the same configuration, circuit block, and operation as those of the paper sheet identification device 100 described above is the same as the paper sheet identification device 100 for convenience of explanation. These descriptions shall refer to the above description. In addition, what needs to be described is briefly described.

  As shown in FIGS. 4 and 5, the paper sheet identification apparatus 101 is inserted from a microcomputer 601 that performs overall control of the entire paper sheet identification apparatus 101 and a bill insertion slot (not shown) of the paper sheet identification apparatus 101. The banknote transport mechanism 40 (portion surrounded by the broken line) for transporting the banknote 130 and the respective faces (front surface, back surface) of the banknote 130 transported by the banknote transport mechanism 40 are sequentially irradiated with red and green light. An optical detection unit 301 (a portion surrounded by a one-dot chain line) that detects received light data corresponding to each received light amount of reflected light and transmitted light on each surface of the banknote 130 by irradiation light. The configuration of the microcomputer 601 is the same as that of the paper sheet identification apparatus 100 except that the configuration of a part of the microcomputer 601 is different from that of the optical detection unit 30 and the microcomputer 60 of the paper sheet identification apparatus 100. It has been.

  The optical detection unit 301 of the paper sheet identification apparatus 101 has a light source 1 disposed on the upper side in the same manner as the optical detection unit 30 of the paper sheet identification apparatus 100 with the inserted banknote 130 conveyed by the banknote conveyance mechanism 40 interposed therebetween. In addition to the (first light source), the spherical lens 4 (first lens) and the light receiving element 5 (first light receiving element), the reflected light on the surface of the inserted banknote 130 is received in a direction perpendicular to the surface of the inserted banknote 130. The spherical lens 15 (third lens) and the light receiving element 16 (third light receiving element) arranged in this manner are arranged.

  Further, a slit 28 is disposed immediately before the light receiving element 16 to receive light by limiting the detection region.

  Further, on the lower side across the inserted banknote 130, a light source 8 (second light source), a spherical lens 11 (second lens), and a light receiving unit arranged in the same manner as the optical detection unit 30 of the paper sheet identification apparatus 100. In addition to the element 12 (second light receiving element), the ball lens 19 (fourth lens) and the light receiving element 20 are arranged so as to receive the reflected light on the back surface of the inserted banknote 130 in the direction perpendicular to the back surface of the inserted banknote 130. (Fourth light receiving element) is arranged.

  Further, a slit 29 for receiving light by limiting the detection region is disposed immediately before the light receiving element 20.

  The optical detection unit 301 includes a light receiving element 16 (third light receiving element) and a light receiving element 20 (fourth light receiving element) in addition to the configuration of the optical detection unit 30 of the paper sheet identification apparatus 100. Thus, the light receiving element 16 (third light receiving element) and the microcomputer 601 are connected via the amplifier (amplifier circuit) 17 and the A / D converter 18, and the light receiving element 20 (fourth light receiving element) and the microcomputer 601 are connected. Are connected via an amplifier (amplifier circuit) 21 and an A / D converter 22.

  The respective light receiving elements of the light receiving element 16 (third light receiving element) and the light receiving element 20 (fourth light receiving element) are the same as the light receiving element 5 (first light receiving element) and the light receiving element 12 (second light receiving element). For example, a photodiode or the like outputs an electric signal having a signal level corresponding to the amount of received reflected light or transmitted light. The electric signal output from each light receiving element is amplified by each amplifier, and each A / D After being converted into light reception data of a digital signal by the converter, it is stored in a predetermined storage area of the memory 57 of the microcomputer 601 through the bus 70.

  The ball lens 15 (third lens) is inserted into the inserted banknote 130 by the reflected light from the surface of the inserted banknote 130 by the irradiation light from the light source 1 (first light source) and the irradiation light from the light source 8 (second light source). The transmitted light is condensed in the direction perpendicular to the surface of the inserted bill 130 and imaged on the light receiving surface of the light receiving element 16 (third light receiving element), and the spherical lens 19 (fourth lens) is a light source. The reflected light of the back side of the inserted banknote 130 by the irradiation light from 8 (second light source) and the transmitted light of the insertion banknote 130 by the irradiation light from the light source 1 (first light source) are perpendicular to the back side of the inserted banknote 130. The light is condensed and imaged on the light receiving surface of the light receiving element 20 (fourth light receiving element).

  Note that each light-emitting element may be replaced with a light-emitting element that emits infrared light or ultraviolet light in addition to visible light.

  Similar to the paper sheet identification device 100, the paper sheet identification device 101 includes a magnetic sensor for specifying the denomination and insertion direction of the inserted banknote 130, a reflection type optical sensor, and a transmission type optical sensor. The magnetic and optical sensors 49 and the bill insertion detection sensor 47 (see FIG. 5) for detecting that the bill 130 is inserted into the paper sheet identification device 101 are connected to the optical detection unit 301 of the paper sheet identification device 101. Separately, it is arranged at a predetermined position of the paper sheet identification device 101.

  The operation of each of these sensors is the same as that of the above-described paper sheet identification apparatus 100, and description thereof is omitted here.

  In the present embodiment, for convenience of explanation, the transmissive optical sensor and the reflective optical sensor of the magnetic and optical sensor 49 are provided separately from the optical detection unit 301. It is good also as a structure which the optical detection part 301 doubles and detects the light reception data of the transmitted light and reflected light of the insertion banknote 130 for pinpointing.

  The microcomputer 601 constituting the paper sheet identification apparatus 101 includes a control unit 510, a denomination and insertion direction determination unit 52, a received light data correction unit 530, a watermark region data specification unit 54, and a pearl data determination unit 550. , A watermark data determination unit 56 and a memory 57 are provided.

  The memory 57 includes received light data of reflected light and transmitted light of two colors (red and green) of each surface (front surface and back surface) of the inserted banknote 130 detected by the optical detection unit 301, and a magnetic and optical sensor 49 (FIG. 5), the received light data and magnetic data of the reflected light and transmitted light of each surface of the inserted banknote 130, the preset watermark area data address reference table, the pearl ink printing unit data address reference table, etc. Various reference tables and reference data, and various processing programs are stored.

  In the watermark area data address reference table and the pearl ink printing unit data address reference table, as in the case of the paper sheet identification device 100, each authenticity corresponding to the front and back of the genuine banknote for each denomination and the normal and reverse insertion directions. Address information of the start point and end point of the storage area (memory 57) where the received light data of the watermark area of the banknote is stored, and address information of the start point and end point of the storage area (memory 57) where the received light data of the pearl ink printing unit is stored Is set in advance so that it can be referred to corresponding to the denomination and insertion direction of the genuine banknote.

  The denomination / insertion direction determination unit 52 uses the magnetic data of the inserted banknote 130 detected by the magnetic and optical sensor 49 and the received light data of the transmitted light and the reflected light as in the case of the paper sheet identification device 100. Based on the denomination of the inserted banknote 130 and the insertion direction are determined.

  The received light data correction unit 530 detects the maximum received light amount from the received light amounts of the red reflected light data and the green reflected light data in the watermark area acquired from the inserted banknote 130, and based on the correction of the maximum received light amount to the specified value. Correction is performed on all reflected light data of the inserted bill 130 detected by the optical detection unit 301.

  As in the case of the paper sheet identification device 100, the watermark area data specifying unit 54 creates a watermark area data address reference table based on the denomination and insertion direction determination result of the inserted banknote 130 by the denomination and insertion direction determination unit 52. The received light data of the watermark area of the inserted banknote 130 is read from the memory 57 with reference to the memory 57.

  The pearl data determination unit 550 uses the ink color and pearl ink component at each measurement position on each surface of the inserted banknote 130 obtained from the correction data obtained by correcting the reflected light data of each color by the light reception data correction unit 530 and the determination criteria thereof. Based on this, the authenticity of the inserted banknote 130 is determined.

  The watermark data determination unit 56 determines the authenticity of the inserted banknote 130 based on the received light data of the watermark area of the inserted banknote 130 specified by the watermark area data specifying unit 54 as in the case of the paper sheet identification device 100.

  Further, in the paper sheet identification device 101, similarly to the paper sheet identification device 100 described above, a magnetic and optical sensor 49 is connected to the microcomputer 601 through the amplifier circuit 50, and the magnetic and optical sensor 49 detects the magnetic and optical sensor 49. The magnetic data and the received light data thus amplified are amplified by the amplifier circuit 50 and input to the microcomputer 601 so that the microcomputer 601 can authenticate the inserted banknote 130 based on the input data by a known banknote identification method. It is configured.

  An authenticity according to the present invention is a method in which the paper sheet identification device 101 configured as described above acquires the characteristic data of the inserted banknote 130 with high accuracy by the optical detection unit 301 and accurately determines the authenticity of the inserted banknote 130. This will be described based on the bill structure.

  FIG. 6 is a diagram illustrating an example of a configuration of a genuine banknote that the paper sheet identification apparatus 101 identifies as a genuine note and an example of a waveform signal corresponding to each received light data of the genuine banknote detected by the optical detection unit 301.

  As shown in FIG. 6A, the genuine banknote identified by the paper sheet identification device 101 as a genuine note is the genuine banknote 110 shown in FIG. A region 113 is formed, and a pearl ink printing part 111 and a pearl ink printing part 112 are formed at both ends in the longitudinal direction of one side of the genuine banknote 110.

  The genuine banknote 110 inserted into the paper sheet identification device 101 is transported in the predetermined transport direction (in the direction of the arrow in the figure) along the transport path 80 by the banknote transport mechanism 40 and transported into the optical detection unit 301. Since the inserted banknote 110 has a narrower width (for example, 1 mm) of the conveyance path 80 in the optical detection unit 301 than a width (for example, 2 mm) of the conveyance path 80 in other parts, It is conveyed along the conveyance path 80 while the folds, folds and flutter of the genuine banknote 110 are regulated.

  When the genuine banknote 110 is conveyed into the optical detection unit 301, the control unit 510 of the microcomputer 601 sequentially emits LEDs of the respective colors of the light source 1 (first light source) and the light source 8 (second light source) to authenticate. The reflected light and transmitted light of each color (red, green) at each measurement position on each surface (front surface and back surface) of the banknote 110 are received by a light receiving element 5 (first light receiving element), a light receiving element 12 (second light receiving element), and light reception. Light is received by the element 16 (third light receiving element) and the light receiving element 20 (fourth light receiving element), and light reception data of each light reception output value corresponding to each light reception amount is collected.

  Specifically, the light reflected on the surface of the genuine banknote 110 by the light emission of each color (red, green) LED of the light source 1 (first light source) is used as the light receiving element 5 (first light receiving element) and the light receiving element 16 (third). Of the genuine banknote 110 is received by the light receiving element 12 (second light receiving element), and the received light output value (reflected light data) corresponding to the amount of light received by each light receiving element. And transmitted light data).

  After collecting the reflected light data and transmitted light data of the genuine bill 110 by the light emission of the light source 1 (first light source), the back side of the genuine bill 110 by the light emission of each color (red, green) LED of the light source 8 (second light source). Is received by the light receiving element 12 (second light receiving element) and the light receiving element 20 (fourth light receiving element), and the transmitted light of the genuine banknote 110 is received by the light receiving element 5 (first light receiving element). The light receiving data of the light receiving output values (reflected light data and transmitted light data) corresponding to the amount of light received by each light receiving element is collected, and such control operation is performed for each sheet of the genuine banknote 110. It repeats until the light reception data of the measurement position is collected.

  The received light data of the reflected light detected by the light receiving element 5 (first light receiving element) or the light receiving element 12 (second light receiving element) among the respective received light data thus collected is shown in FIG. As shown, the waveform signal 120 and the waveform signal 121 having the characteristics shown in FIG. 3B described above are collected, and the received light data is detected by the waveform signal 120 when the genuine banknote 110 is irradiated with red light. The received light data when light is irradiated is detected by the waveform signal 121.

  When the ratio of the received light output value of green reflected light to the received light output value of red reflected light (red / green ratio (oblique light)) is calculated from these received light data (waveform signal 120 and waveform signal 121), it is shown in FIG. As described above, the waveform signal 122 having the characteristics shown in FIG. 3C is calculated.

  The received light data of the reflected light detected by the light receiving element 16 (third light receiving element) or the light receiving element 20 (fourth light receiving element) is red light on the genuine banknote 110 as shown in FIG. The received light data when the light is irradiated is detected by the waveform signal 123, and the received light data when the green light is irradiated is detected by the waveform signal 124.

  When the ratio of the received light output value of the green reflected light to the received light output value of the red reflected light (hereinafter referred to as “red-green ratio (vertical light)”) is calculated from these received light data (the waveform signal 123 and the waveform signal 124). A waveform signal 125 as shown in FIG. 6 (e) is calculated.

  Further, it is detected by the light receiving element 16 (third light receiving element) or the light receiving element 20 (fourth light receiving element) from the waveform signal 125 (see FIG. 6E) and the waveform signal 122 (see FIG. 6C). The ratio of the red-green ratio (oblique light) of the reflected light detected by the light receiving element 5 (first light receiving element) or the light receiving element 12 (second light receiving element) to the red-green ratio (vertical light) of the reflected light (red) When the green ratio) is calculated, a waveform signal 126 as shown in FIG.

  When each of these waveform signals is analyzed, from the waveform signal 120 and the waveform signal 121 shown in FIG. 6B, red light is irradiated to the genuine banknote 110 as shown in FIG. When the light receiving element 5 (first light receiving element) or the light receiving element 12 (second light receiving element) receives light, the light reception output of the reflected light of the pearl ink printing portion is detected to be significantly larger than that of other plain portions. In addition, the detection result of the characteristic that the light reception output of the reflected light of the pearl ink printing portion when irradiated with green light is almost the same as other plain portions is obtained, and the waveform signal 122 shown in FIG. 6C is obtained. From the (red / green ratio (oblique light)), the red / green ratio (oblique light) of the pearl ink printing part of the genuine banknote 110 is smaller than the plain area of the watermark area. Can get information .

  Further, from the waveform signal 123 and the waveform signal 124 shown in FIG. 6D, the genuine banknote 110 is irradiated with red light and green light to receive the light receiving element 16 (third light receiving element) or the light receiving element 20 (fourth light receiving element). The light receiving output of the reflected light hardly changes between the pearl ink printed part and the other plain part. In other areas, for example, when the irradiation light is red, When the received light output of reflected light is large and the irradiated light is green, the received light output of reflected light in the green print area is large, and the received light output of reflected light is small in the black print area. Is obtained.

  Further, from the waveform signal 125 (red / green ratio (vertical light)) shown in FIG. 6 (e), the red / green ratio (vertical light) is obtained between the pearl ink printing portion of the genuine banknote 110 and the plain portion of the watermark region. Information on hues that do not depend on the pearl ink in the pearl ink printing section that hardly changes is obtained.

  Further, from the waveform signal 126 (red / green ratio) shown in FIG. 6 (f), the pearl ink printing portion of the genuine banknote 110 has a waveform compared to other areas (areas where watermark areas and patterns are printed). A significant difference detection result is obtained as indicated by 126-a and 126-b of the signal 126 (red / green ratio).

  From such a detection result, the paper sheet identification device 101 detects the red-green ratio of the reflected light of the inserted banknote 130 detected by the light receiving element 5 (first light receiving element) or the light receiving element 12 (second light receiving element) ( (Oblique light) is calculated and information including a color depending on the pearl ink of the pearl ink printing part printed on the inserted banknote 130 is acquired, and the light receiving element 16 (third light receiving element) or the light receiving element 20 (fourth light receiving element). The red / green ratio (vertical light) of the reflected light of the inserted banknote 130 detected by the element) is calculated, and information including the color of the ink that does not depend on the pearl ink of the pearl ink printing part printed on the inserted banknote 130 is acquired. Furthermore, the ratio of red-green ratio (vertical light) to red-green ratio (oblique light) (red-green ratio) is calculated to detect the delicate pearl ink characteristics of the pearl ink printed part printed on the inserted banknote 130. Just to Unlike the hue ink discrimination method based on the received light output of various reflective photosensors, it is configured to perform more accurate authenticity discrimination based on the discrimination result of the delicate characteristics of the pearl ink printed on the inserted banknote 130. Yes.

  In the present embodiment, an example in which each light source emits red and green light in the optical detection unit 30 of the paper sheet identification device 100 and the optical detection unit 301 of the paper sheet identification device 101 is shown. It is good also as a structure which light-emits other colors in addition to red and green.

  An example of the paper sheet identifying apparatus 102 according to the present invention having a configuration different from that of the above-described paper sheet identifying apparatus 101 (see FIG. 4) will be described with reference to FIGS.

  FIG. 7 is a configuration diagram showing the configuration of the paper sheet identification apparatus 102. FIG. 8A is a perspective view showing the configuration of the optical detection unit 302 provided in the paper sheet identification apparatus 102, and FIG. ) Is a cross-sectional view of a main part of the optical detection unit 302.

  7 and 8, for convenience of explanation, the same reference numerals as those of the paper sheet identification device 101 are assigned to the respective parts of the paper sheet identification device 102 that perform the same configuration and operation as the paper sheet identification device 101 described above. These descriptions refer to the above description.

  As shown in FIG. 7, the paper sheet identification device 102 includes a microcomputer 602 that performs overall control of the paper sheet identification device 102, and a banknote transport mechanism 40 that transports a banknote 130 inserted in the paper sheet identification device 102. Then, each surface (front surface, back surface) of the inserted banknote 130 conveyed by the banknote transport mechanism 40 is sequentially irradiated with each color (red, green) light, and received light data of reflected light and transmitted light on each surface of the inserted banknote 130 is obtained. The optical detection unit 302 is configured to detect and detect infrared light transmitted through the inserted banknote 130 by irradiating the surface of the inserted banknote 130 with infrared light obliquely.

As shown in FIGS. 8A and 8B, the optical detection unit 302 has a paper sheet identification device 101 on the upper side and the lower side with the inserted banknote 130 conveyed by the banknote conveyance mechanism 40 interposed therebetween. The light source 1 (first light source), the spherical lens 4 (first lens), the light receiving element 5 (first light receiving element), and the spherical lens 15 (third lens) arranged in the same manner as the optical detection unit 301 of FIG. And a sensor unit (upper side) composed of a light receiving element 16 (third light receiving element), a light source 8 (second light source), a spherical lens 11 (second lens), and a light receiving element 12 (second light receiving element). ), In addition to a sensor unit (lower side) composed of a ball lens 19 (fourth lens) and a light receiving element 20 (fourth light receiving element), on the upper side of the inserted banknote 130 and each sensor unit A predetermined angle with respect to the surface of the inserted bill 130 from the side surface (example) If infrared LED23 to irradiate infrared light is formed by arranging an oblique direction of 45 degrees).
As described above, the paper sheet identification device 102 is configured such that the optical detection unit 302 is different from the optical detection unit 301 of the paper sheet identification device 101, and the paper sheet identification device corresponds to the configuration of the optical detection unit 302. The configuration of the microcomputer 602 of 102 is the same as that of the microcomputer 601 of the paper sheet identification apparatus 101, except that part of the configuration is different from that of the microcomputer 601 of the paper sheet identification apparatus 101.

  By comprising in this way, the infrared light irradiated from infrared light LED23 is irradiated uniformly to the irradiation surface of the insertion banknote 130, and the infrared light which permeate | transmits the insertion banknote 130 is received by the light receiving element 20 (4th The light receiving element) can receive light.

  Further, it is not necessary to use a multicolor LED including infrared light for the light source 1 (first light source), and a light receiving element dedicated to infrared light is not required, so that the sensor cost can be reduced.

  For example, when ink that absorbs infrared light is printed on a genuine banknote, the infrared light LED 23 irradiates the inserted banknote 130 with infrared light and transmits the transmitted light to the light receiving element 20 (fourth light receiving element). In addition to the authenticity determination method of the inserted banknote 130 by the configuration of the paper sheet identification device 101, it is possible to determine whether or not the inserted banknote 130 has been copied and counterfeited.

  An example of the paper sheet identifying apparatus 103 according to the present invention having a different configuration from the above-described paper sheet identifying apparatus 102 (see FIG. 8) will be described with reference to FIGS.

  FIG. 9 is a configuration diagram illustrating the configuration of the paper sheet identification device 103. FIG. 10A is a perspective view illustrating the configuration of the optical detection unit 303 included in the paper sheet identification device 103. FIG. ) Is a cross-sectional view of a main part of the optical detection unit 303.

  In FIG. 9 and FIG. 10, the same reference numerals as those of the paper sheet identification device 102 are assigned to the respective parts of the paper sheet identification device 103 that perform the same configuration and operation as those of the paper sheet identification device 102 described above. These descriptions refer to the above description.

  As shown in FIG. 9, the paper sheet identification device 103 includes a microcomputer 603 that performs overall control of the paper sheet identification device 103 and a banknote transport mechanism that transports an inserted banknote 130 inserted in the paper sheet identification device 103. 40 and each surface (front surface, back surface) of the inserted banknote 130 transported by the banknote transport mechanism 40 are sequentially irradiated with light of each color (red, green) to detect light reception data of reflected light and transmitted light on each surface of the banknote. The inserted bill 130 is configured by an optical detection unit 303 that detects infrared light transmitted through the inserted bill 130 by irradiating the inserted bill 130 with infrared light from a direction perpendicular to each surface of the inserted bill 130.

  As shown in FIG. 10A and FIG. 10B, the optical detection unit 303 has an insertion bill 130 conveyed by the bill conveyance mechanism 40 on the upper side and lower side of the paper sheet identification device 102. The light source 1 (first light source), the spherical lens 4 (first lens), the light receiving element 5 (first light receiving element), the spherical lens 15 (third lens), and the like arranged in the same manner as the optical detection unit 302 A sensor unit (upper side) composed of a light receiving element 16 (third light receiving element), a light source 8 (second light source), a spherical lens 11 (second lens), and a light receiving element 12 (second light receiving element). In addition, the sensor unit (lower side) composed of the spherical lens 19 (fourth lens) and the light receiving element 20 (fourth light receiving element) and the surface of the inserted banknote 130 are irradiated with infrared light from the vertical direction. Insert the infrared LED 24 into the upper side of the banknote 130 And it arrange | positions at the side surface of a sensor unit (upper side), opposes the light receiving element 25 with infrared light LED24, and is arrange | positioned on the lower side and the side surface of a sensor unit (lower side) on both sides of the insertion banknote 130. Has been.

  As described above, the paper sheet identification device 103 is configured such that the optical detection unit 303 is different from the optical detection unit 302 of the paper sheet identification device 102, and the paper sheet identification device corresponds to the configuration of the optical detection unit 303. The configuration of the microcomputer 103 is the same as that of the paper identification device 102 except that a part of the configuration of the microcomputer 603 is different from the configuration of the microcomputer 602 of the paper identification device 102.

  By comprising in this way, the infrared light irradiated from infrared light LED24 is equally irradiated to the irradiation surface of the insertion banknote 130 from the perpendicular direction of the surface of the insertion banknote 130, and the infrared light which permeate | transmitted the insertion banknote 130 is transmitted. Since light is received by the light receiving element 25, alignment such as axial alignment of the infrared LED 24 and the light receiving element 25 is facilitated.

  Further, since it is not necessary to use a multicolor LED including infrared light for the light source 1 (first light source), the sensor cost is reduced.

The block diagram which shows the structural example of the paper sheet identification device 100 concerning this invention Circuit block diagram showing an example of a circuit configuration of the paper sheet identification apparatus 100 The figure which shows an example of the waveform signal of the light reception data of the structure of the genuine banknote 110 and the genuine banknote 110 detected by the optical detection part 30. The block diagram which shows the structural example of the paper sheet identification device 101 concerning this invention Circuit block diagram showing an example of the circuit configuration of the paper sheet identification apparatus 101 The figure which shows an example of the waveform signal of the light reception data of the structure of the genuine banknote 110 and the genuine banknote 110 detected by the optical detection part 301. The block diagram which shows the structural example of the paper sheet identification apparatus 102 concerning this invention A perspective view and a sectional view showing a configuration of the optical detection unit 302 of the paper sheet identification apparatus 102 The block diagram which shows the structural example of the paper sheet identification apparatus 103 concerning this invention A perspective view and a cross-sectional view showing the configuration of the optical detection unit 303 of the paper sheet identification device 103

Explanation of symbols

1, 8 Light source 2, 6, 9, 13, 17, 21 Amplifier (circuit)
3, 10, D / A converter 4, 11, 15, 19 Spherical lens 7, 14, 18, 22 A / D converter 5, 12, 16, 20, 25 Light receiving element 26, 27, 28, 29 Slit 30, 301, 302, 303 Optical detection unit 31, 32 Irradiation optical path 40 Bill transport mechanism 41 Transport motor 42, 43 Roller 44 Transport belt 45 Encoder 47 Bill insertion detection sensor 49 Magnetic and optical sensor 60, 601, 602, 603 Microcomputer 51, 510 Control Section 52 Denomination and insertion direction determination section 53, 530 Light reception data correction section 54 Watermark area data identification section 55, 550 Pearl data determination section 56 Watermark data determination section 57 Memory 70 Bus 80 Transport path 100, 101, 102, 103 Paper sheet Class identification device 110 Genuine banknote 111, 112 par Receiving data waveform signal of the red reflected light of the ink printing unit 120 authentic bill 110 (light receiving element 5 or the light receiving element 12)
121 The received light data of the green reflected light of the genuine banknote 110 is a waveform signal (the light receiving element 5 or the light receiving element 12).
122 Wave signal of red / green ratio (oblique light) (light receiving element 5 or light receiving element 12)
123 The received light data of the red reflected light of the genuine banknote 110 is a waveform signal (the light receiving element 16 or the light receiving element 20).
124 The received light data of the green reflected light of the genuine banknote 110 is a waveform signal (the light receiving element 16 or the light receiving element 20).
125 Wave signal of red / green ratio (vertical light) (light receiving element 16 or light receiving element 20)
126 Wave signal with red / green ratio

Claims (6)

A paper sheet transporting means for transporting the paper sheet along a transport path; and an optical detection unit for detecting the characteristics of the paper sheet, and identifying the paper sheet based on light reception data from the optical detection unit. In the paper sheet identification device to perform,
The optical detection unit is
A first light source disposed at a predetermined angle with respect to the surface of the paper sheet transported by the paper sheet transporting means, and irradiating light on the surface of the paper sheet;
A first lens for collecting the reflected light reflected by the surface of the paper sheet;
A first light receiving element that receives light transmitted through the first lens;
A second light source disposed at a predetermined angle with respect to the back surface of the paper sheet transported by the paper sheet transporting means and irradiating the paper sheet with light;
A second lens for collecting the reflected light reflected by the back surface of the paper sheet;
A second light receiving element for receiving light transmitted through the second lens;
With
The first lens main surface and the light receiving surface of the first light receiving element are arranged in a Shine proof relationship with respect to the reflecting surface of the surface of the paper sheet irradiated with light from the first light source. The second lens main surface and the light receiving surface of the second light receiving element are in a Scheinproof relationship with respect to the reflective surface on the back side of the paper sheet irradiated with light from the second light source. A paper sheet identification device characterized by being arranged. The optical detection unit is
An optical detection unit that detects the characteristics of a paper sheet having a hue ink print region in which the hue changes depending on the viewing angle,
The first light source and the second light source have light of a plurality of colors,
A third lens that collects reflected light of the light from the first light source reflected by the surface of the paper sheet in a direction perpendicular to the surface of the paper sheet;
A third light receiving element for receiving light transmitted through the third lens;
A fourth lens that condenses the reflected light of the light from the second light source reflected on the back surface of the paper sheet in a direction perpendicular to the back surface of the paper sheet;
A fourth light receiving element for receiving light transmitted through the fourth lens;
Further comprising
The light receiving output of the first light receiving element when the plurality of lights from the first light source are irradiated onto the hue ink printing region of the paper sheet, or the plurality of lights from the second light source are used as the paper sheet. First calculation means for calculating a first hue depending on the hue ink print area based on a light reception output of the second light receiving element when irradiated to a similar hue ink print area;
The light receiving output of the third light receiving element when the plurality of lights from the first light source are irradiated onto the hue ink printing region of the paper sheet, or the plurality of lights from the second light source are used as the paper sheet. A second calculating means for calculating a second hue independent of the hue ink printing area based on a light reception output of the fourth light receiving element when irradiated to a similar hue ink printing area;
The paper sheet identification apparatus according to claim 1, further comprising: a paper sheet discrimination unit that discriminates the paper sheet based on the calculation results of the first calculation unit and the second calculation unit. . The first light source and the second light source include an irradiation light path,
The paper sheet identification device according to claim 1, further comprising a scattering reflection surface on an inner wall of the irradiation optical path. The first lens is arranged so that the image of the detection area on the surface of the paper sheet and the size of the image formed on the light receiving surface of the first light receiving element are the same size
The second lens is arranged so that the size of the image of the detection area on the back side of the paper sheet and the image formed on the light receiving surface of the second light receiving element are equal,
A first slit for restricting the detection area of the paper sheet is disposed immediately before the first light receiving element;
The paper sheet identification apparatus according to claim 1, wherein a second slit for restricting a detection area of the paper sheet is disposed immediately before the second light receiving element. The part where the optical detection unit is arranged on the conveyance path,
The paper sheet identification device according to claim 1, wherein a width in a vertical direction with respect to the paper sheet is narrower than that of the other transport paths. The first lens, the second lens, the third lens, and the fourth lens are
6. The spherical lens according to claim 1, wherein the first light receiving element and the second light receiving element are arranged perpendicular to a transport path of the paper sheet. Paper sheet identification device.

Images