JP4554048B2 - Paper sheet and paper sheet identification device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a paper sheet identification apparatus that can more reliably identify the authenticity of various paper sheets, for example, securities such as banknotes and stock certificates, and various slips.
[0002]
[Prior art]
  2. Description of the Related Art Conventionally, a paper sheet identification device that identifies the authenticity of paper sheets such as banknotes and securities is known. Such an identification device optically reads characters, figures, symbols, and patterns (hereinafter referred to as print marks) printed on various portions of a paper sheet, converts them into electrical signals, and stores real print marks stored in advance. It was common to identify authenticity by comparing with an electrical signal.
[0003]
  However, in recent years, since the trick technique has become more sophisticated, it has become difficult to discriminate authenticity only for ordinary print marks. Therefore, as described in European Patent Publication EP0996099A2, there is a problem with ultraviolet rays and alternating voltages. Banknotes may be printed with luminescent ink that uses a material that emits fluorescence upon reaction (electroluminescence (hereinafter referred to as EL material)). Since it emits light when it is irradiated or placed in an AC electromagnetic field, even if the pattern or the like by normal printing matches with authentic paper sheets, authenticity is identified by detecting the presence or absence of this light emission. be able to.
[0004]
[Problems to be solved by the invention]
  However, if the above-described luminescent ink is used for fake paper sheets, there is a problem that it is difficult to identify authenticity. That is, since the EL material is in the form of extremely fine fine powder, it is made a paper sheet to which the EL material is applied by simply performing a simple operation of spraying and sticking it on the surface of the paper sheet. Can do. Therefore, the paper sheet to which the EL material is applied by such an operation cannot be identified even if the EL material emits light in an alternating electromagnetic field. The same applies to other luminescent inks than EL.
[0005]
  In order to eliminate such inconvenience, light reception detection is performed for both the print mark made of luminescent ink and the print mark made of normal ink, and authenticity is determined by the presence or absence of a predetermined correlation between these detected values, It may be possible to determine the authenticity of a print mark by comparing the detected value with a real print mark. However, even in this case, especially for luminescent inks, even if the printing place is different, or even in the same printing place, the ink placement varies depending on the individual printing machine, and the degree of light emission is also in the same AC electromagnetic field environment. This raises a new problem that authentication accuracy is lowered.
[0006]
  The present invention has been made to solve the above-described problems, and paper sheet identification that can reliably identify authenticity even if the application of luminescent ink on the paper sheet fluctuates. The object is to provide a device.
[0007]
[Means for Solving the Problems]
  Claim 1Paper sheets identified by the paper sheet identification deviceThe security mark is printed using both luminescent ink that emits light when placed in a predetermined environment and normal non-luminescent ink, and the security mark is printed with and / or in the vicinity of the security mark. Monitor print toneforThe monitor mark is printed with luminescent ink.
[0008]
  thisPaper sheetsAccording to the above, when the paper sheet identification device that stores the reference light intensity in advance reads the security mark of the paper sheet, it first reads the monitor mark that emits light in a predetermined environment. Since the print tone of the security mark can be known by comparing the light intensity of the mark with the reference light intensity, it becomes possible to perform correction based on the comparison result of the read security mark. Standardization of emission intensity data is realized.
[0009]
  Therefore, in the authenticity determination of paper sheets based on the emission intensity data that varies from the read security mark, the conventional inconvenience that the determination accuracy is inferior due to the above-mentioned variation is eliminated, and the authenticity identification accuracy of the paper sheets is improved. To do.
[0010]
  Specifically,Claim1DescribedPaper sheet identification deviceIsthe aboveA paper sheet identification device for identifying the authenticity of a paper sheet by scanning in the direction in which the monitor mark extends, and is a first apparatus for receiving light emitted from a light emitting ink of a security mark when placed in a predetermined environment. 1 light receiving means, a second light receiving means for receiving the reflected light from the non-light emitting ink of the security mark, and a third light receiving means for receiving the light emitted from the monitor mark, wherein the first and second light receiving means are The third light receiving means is arranged to receive light from the same position of the paper sheet, and compares the light intensity received by the third light receiving means with a preset reference light intensity to obtain a deviation from the reference light intensity. Light intensity comparison means for calculating, light intensity conversion means for converting the output value from the first light receiving means into a corrected output value corresponding to the deviation, and authenticity of the paper sheet based on the corrected output value true It is characterized in that the discriminating means.
[0011]
  According to the present invention, when the paper sheets supplied to the identification device are placed in a predetermined environment, the monitor mark made of luminescent ink emits light, and this light emission is received by the third light receiving means. The light intensity of the monitor mark received by the third light receiving means is compared with a reference light intensity set in advance by the light intensity comparing means, and a deviation is calculated. Based on the calculation result, the light intensity converting means The output value from the first light receiving means is converted into a corrected output value corresponding to the deviation. Based on this corrected output value, the authenticity determining means determines the authenticity of the paper sheet.
[0012]
  Thus, prior to determining the authenticity of the paper sheet, it is sent to the authenticity determining means as an electric signal in a state in which the density of the luminescent ink of the printed monitor mark is corrected to a standard one, Here, since the predetermined authenticity determination process is performed, the inconvenience that the difference in the ink placement of the luminescent ink on the paper sheet affects the authenticity determination result is eliminated, and proper authenticity determination is always realized.
[0013]
  In addition, examples of the predetermined environment in which the luminescent ink emits light include an AC electromagnetic field environment, a light irradiation environment in which light having a predetermined wavelength is irradiated with infrared rays, ultraviolet rays, or ordinary visible light.
[0014]
  Claim2The described invention is claimed.1In the described invention, the predetermined environment is an AC electromagnetic field environment formed by applying an alternating voltage, and the luminescent ink uses electroluminescence that emits light in an AC electromagnetic field environment. It is characterized by this.
[0015]
  According to the present invention, since electroluminescence emits light in an alternating electromagnetic field environment, it does not emit light in a normal environment and is colorless. Therefore, when authenticity is identified, it normally performs its function and normally has no problem. Paper sheets can be used.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  1 and 2 are perspective views showing an embodiment of a paper sheet identification apparatus according to the present invention. FIG. 1 shows a state in which the casing lid is closed, and FIG. 2 shows that the casing lid is opened. Each state is shown. FIG. 3 is an exploded perspective view showing an embodiment of the apparatus main body housed in the casing, and FIG. 4 is an assembled perspective view thereof. 5 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 6 is a cross-sectional view taken along line BB in FIG. 1 to 4, the XX direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction. In particular, the -X direction is leftward, the + X direction is rightward, the -Y direction is forward, and the + Y direction is forward. It is called the back.
[0017]
  The paper sheet identification device 1 of this embodiment prints characters, figures, or symbols using both EL (electroluminescence) ink that emits light when placed in an AC electromagnetic field environment and normal printing ink. The authenticity of the bills (paper sheets) M is identified, and a security mark is printed at a predetermined position for authenticity identification using both inks, and ink placement is monitored in the vicinity of the security mark. The authenticity of the banknote M in which the monitor mark for printing is printed using luminescent ink is identified.
[0018]
  In order to perform this identification, the paper sheet identification apparatus 1 includes a first detection structure 71, a second detection structure 72, and a third detection structure 73, which will be described in detail later. The first detection structure 71 detects EL emission in an AC electromagnetic field environment, and the second detection structure 72 detects reflected light of normal ink. In addition, the third detection structure 73 detects the degree (intensity of light and shade) of the light emitting ink applied.
[0019]
  As shown in each of the above drawings, the paper sheet identification device 1 is formed such that the device body 2 and the control device 8 are housed in a box-shaped casing 9. The casing 9 includes a rectangular parallelepiped casing main body 91 and a lid 92 provided on the upper portion of the casing main body 91.
[0020]
  A pair of brackets 93 extending in the front-rear direction are provided on both sides in the width direction of the upper surface of the casing body 91, and the lid 92 has a horizontal shaft 94 with its rear end portion sandwiched between the pair of brackets 93. By being pivotally supported so as to be rotatable around, the posture is changed between the closed posture folded on the casing main body 91 shown in FIG. 1 and the open posture standing on the rear end portion of the casing main body 91 shown in FIG. It has come to be able to do.
[0021]
  In the state where the lid 92 is set in the closed posture, as shown in FIG. 1, a bill conveyance path 95 is formed between the upper surface of the casing main body 91 and the lower surface of the lid 92, and from the front surface of the casing 9. When the banknote M is inserted into the banknote transport path 95, a sensor (not shown) detects this, and the banknote M is moved into the banknote transport path 95 by driving the drive mechanism based on the drive signal from the control device 8 based on the detection signal. The authenticity is identified by the identification mechanism (the first detection structure 71 and the second detection structure 72) which will be described in detail after being pulled in and mounted in the apparatus main body 2.
[0022]
  A plurality of guide protrusions 95a extending in the front-rear direction are provided on the upper surface of the casing main body 91 in the bill conveyance path 95, and a long groove 95b is formed between adjacent guide protrusions 95a. These guide protrusions 95a and long grooves 95b form a top plate 950 of the casing main body 91 as a conveyance path for the bills M.
[0023]
  The plurality of elongated grooves 95b are provided with cutout windows at respective front and rear positions, from which, as shown in FIG. A pair of front and rear auxiliary rollers 95d facing the transport roller 95c is provided on the side, and the banknote M inserted into the banknote transport path 95 is sandwiched between the transport roller 95c and the auxiliary roller 95d, and the transport roller 95c. Is passed through the banknote transport path 95 and is led out from the rear end of the banknote transport path 95 to the outside.
[0024]
  An indicator lamp 98 is provided at a position in front of the top of the lid 92. The indicator lamp 98 includes a ready lamp 98a that displays whether or not the paper sheet identification apparatus 1 is in a usable state, and a pass lamp 98b that displays that the authenticity of the authenticity of the banknote M is acceptable. A failure lamp 98c for indicating failure. The ready lamp 98a is turned on when the power switch 96 is turned on, thereby displaying that the apparatus main body 2 is in an identifiable state. When the apparatus main body 2 is in the identification process, the ready lamp 98a is turned on. Thus, it is understood that the next bill should be inserted until the ready lamp 98a is turned on.
[0025]
  As shown in FIGS. 3 to 6, the apparatus main body 2 is configured to include a light receiving element and a light emitting element, which will be described later, and a sensor device 20 in which an optical member, a wiring board, and the like are integrated into a module. The roller member 3 is provided in 91, and the sensor housing 4 is mounted in the lid 92 so as to face the peripheral surface of the roller member 3 and is mounted with various sensors, substrates, and the like. .
[0026]
  The roller member 3 is on one side of an electrode to which an alternating voltage from an AC power supply 30 (FIG. 5) is applied, and is supported by a predetermined bearing in the casing body 91 so as to be rotatable about its own axis. A metal central shaft 31 extending in the width direction, a metal disc 32 concentrically and integrally fixed to the central shaft 31, and barium titanate (BaTiO 3) concentrically press-fitted into the metal disc 32. An insulating ring 33 made of such a high dielectric constant material, and a metal ring 34 whose outer peripheral surface is in direct contact with the banknote M and is fitted onto the insulating ring 33 in a press-fitted state.
[0027]
  A lead plate 35 is employed as the other side of the electrode to which the alternating voltage is applied. The lead plate 35 includes a flat lead plate main body 35a and an electrode piece 35b formed by bending the front end of the lead plate main body 35a downward. Then, an alternating electromagnetic field is formed in the banknote transport path 95 by applying an alternating voltage from the AC power supply 30 to the roller member 3 and the lead plate 35 in a state where the banknote M is inserted into the banknote transport path 95. To be.
[0028]
  On the other hand, the casing body 91 is provided with a rectangular roller insertion window 91a (FIG. 2) at the center of the top plate 950, and the metal ring 34 of the roller member 3 is exposed to the outside from the roller insertion window 91a. It protrudes. The roller member 3 is urged upward by the urging force of the urging means (not shown) so that the top portion is positioned higher than the guide protrusion 95a.
[0029]
  Further, the metal ring 34 is provided with a striped pattern (not shown) having a predetermined pitch that crosses the outer peripheral surface thereof in the axial direction, while a photo reflector is provided in the vicinity of the roller member 3. 36 is provided. The photo reflector 36 is configured to project the outer peripheral surface of the metal ring 34 and receive the reflected light. The photo reflector 36 detects the rotational speed of the roller member 3 based on the change in the reflected light due to the stripe pattern. Is.
[0030]
  The sensor casing 4 includes a casing main body 41 having a predetermined thickness in a square shape in a plan view, and an inverted quadrangular truncated pyramid-shaped funnel-shaped section 42 integrally provided at a lower portion of the casing main body 41. It is formed with. On the other hand, a rectangular window 92b (FIGS. 2 and 5) corresponding to the funnel 42 is formed in the bottom plate 92a of the lid 92. As shown in FIG. 5, an inclined edge portion 92c corresponding to the inclination of the outer wall surface of the funnel-shaped portion 42 is formed on the inner peripheral surface of the rectangular window 92b, and the sensor housing fitted into the rectangular window 92b from above. The body 4 is mounted in the lid 92 with the outer wall surface of the funnel-shaped portion 42 abutting against the inclined edge portion 92c so that the lower surface is exposed to the outside.
[0031]
  The housing body 41 of the sensor housing 4 is provided with a substrate mounting recess 43 for mounting a substrate 5 (described later) on the top surface, and a glass substrate 6 (described later) on the bottom surface of the funnel-shaped portion 42. A glass substrate mounting recess 44 for mounting is provided. A portion corresponding to the optical path between the recesses 43 and 44 is communicated to form a pair of rectangular optical path holes 45 (a first optical path hole 45a on the left side and a second optical path hole 45b on the right side) in a plan view. The light that has been formed and has passed through the glass substrate 6 passes through the optical path hole 45 toward the bottom of the substrate 5.
[0032]
  An LED mounting hole 46 for mounting an LED 54 described later is formed at the bottom of the substrate mounting recess 43 and on the right side of the optical path hole 45. The lower portion of the LED mounting hole 46 communicates with the glass substrate mounting recess 44. Therefore, the light from the LED 54 enters the glass substrate 6 through the LED mounting hole 46, is reflected at an appropriate place (an irradiation spot P (FIG. 6) described later), and is irradiated toward the back side of the substrate 5. Will be.
[0033]
  The funnel-shaped portion 42 is provided with a lead plate mounting recess 47 for mounting the lead plate 35 adjacent to the rear side of the glass substrate mounting recess 44, and the electrode plate 35b side of the lead plate 35 is the lead plate. It fits in the mounting recess 47 and is fixed by screwing or the like. Then, in a state where the lead plate 35 is attached to the sensor housing 4, the electrode piece 35 b is dimensioned so that the lower end portion thereof faces the top plate 950 (FIG. 2) of the casing body 91.
[0034]
  The substrate 5 is for performing predetermined electrical processing on the output of the light receiving member 51 attached to the back side, wiring for supplying power to the LEDs 54, and the like. A light receiving member 51 is provided at a portion corresponding to the optical path hole 45, and an LED (Light Emitting Diode) 54 as a light emitting element is attached to a portion corresponding to the LED mounting hole 46.
[0035]
  The light receiving member 51 corresponds to the first light path hole 45a, and is attached to the left position of the back surface of the substrate 5 and the second light path hole 45b adjacent to the first light receiving member 52. The second light receiving member 53 is provided so as to correspond thereto. A first light receiving element 521 and a third light receiving element 522 are provided on the lower surface of the first light receiving member 52 from the left side to the right side, and the second light receiving element 531 is formed on the lower surface of the second light receiving member 53. Is provided.
[0036]
  The first light receiving element 521 and the third light receiving element 522 detect so-called EL light from an EL (electroluminescence) material having a characteristic of emitting light in an alternating electromagnetic field. In order to detect such EL light, a band-pass filter 52a that transmits only EL light and cuts other light is laminated on the surface of the first light receiving element 52, and the presence of this band-pass filter 52a makes the first. Only the EL light can enter the light receiving element 52.
[0037]
  The first light receiving element 521 is for receiving light emitted from the EL ink portion M31 in the security mark M3 (FIGS. 7 and 8) of the banknote M, which will be described later, and the second light receiving element 531 is in the security mark M3. It is for receiving the reflected light from the normal ink part M32. The third light receiving element 522 is for receiving light emitted from the monitor mark M4 of the banknote M.
[0038]
  The said 2nd light receiving element 531 is for detecting the reflected light in the banknote M surface of the visible ray (LED light) from LED54 which light-emitted, and the range of the wavelength to detect is wide. Accordingly, the band-pass filter 52 a that is stacked on the first light receiving element 521 is not stacked on the surface of the second light receiving element 531. In the present embodiment, the wavelength of light emitted from the LED 54 is different from the wavelength of EL light just in case.
[0039]
  As shown in FIG. 6, the glass substrate 6 has a pentagonal first glass substrate 61 and a left side of the first glass substrate 61 in a front view (when the glass substrate 6 is viewed in the + Y direction). It consists of a stacked parallelogram-shaped second glass substrate 62 and a trapezoidal third glass substrate 63 stacked on the left side of the second glass substrate 62.
[0040]
  As shown in FIGS. 3 and 6, the right surface of the first glass substrate 61 is an inclined surface 61a having a 45 ° downward inclination with respect to the horizontal plane, and the left surface is the inclined surface 61a. It is formed in parallel, and the irradiation light from the LED 54 is incident perpendicularly to the inclined surface 61a.
[0041]
  The left and right surfaces of the second glass substrate 62 are formed in parallel with the inclined surface 61a. The third glass substrate 63 has a right surface formed in parallel with the inclined surface 61a and a left surface a vertical surface. Then, the first to third glass substrates 61, 62, 63 are laminated in the width direction to form a glass substrate 6 having a trapezoidal shape as a whole. The three-dimensional shape of the glass substrate 6 is set so as to be inserted into the glass substrate mounting recess 44 of the housing body 41 in a press-fitted state, and once fitted, the glass substrate 6 is prevented from being detached by frictional force.
[0042]
  A first dielectric multilayer film 64 formed by vapor deposition of a dielectric material such as titanium oxide is laminated on the left surface of the first glass substrate 61 or the right surface of the second glass substrate 62, and the second glass. The second dielectric multilayer film 65 is laminated on the left surface of the substrate 62 or the right surface of the third glass substrate 63. The first dielectric multilayer film 64 is configured to have a component and a thickness so as to transmit light having a wavelength irradiated from the LED 54 and reflect light having other wavelengths. In contrast, the second dielectric multilayer film 65 is set to reflect EL light.
[0043]
  Then, the irradiation light of the LED 54 is directed toward the bottom surface of the second glass substrate 62, and then is irregularly reflected at the irradiation spot P (FIG. 6) on the surface of the banknote M that is in sliding contact with the bottom surface, and the vertical component directed upward above this irregular reflection. Is received by the second light receiving element 531, and the EL light generated on the bill M at the irradiation spot P is reflected by the first dielectric multilayer film 64 at a right angle to become a horizontal component. The first and second light receiving elements 521 and 531 so that the EL light traveling leftward in the direction is further reflected at a right angle by the second dielectric multilayer film 65 and directed upward and received by the first light receiving element 521. Is set up.
[0044]
  Further, the EL light generated on the banknote M at a position slightly to the left of the irradiation spot P (irradiation spot P1) has its vertical component reflected at a right angle by the first dielectric multilayer film 64 to become a horizontal component. The EL light directed leftward in the direction is further reflected by the second dielectric multilayer film 65 at a right angle and directed upward, refracted by a lens member described later, and received by the third light receiving element 522.
[0045]
  The glass substrate 6 has an ITO film 66 formed by depositing ITO (Indium-Tin-Oxide), which is an oxide of an alloy of indium and tin, on the back surface in contact with the banknote M and the right vertical surface. Yes. The ITO film 66 forms the other electrode for forming an AC electromagnetic field in the bill passage slit 95 (by the way, one electrode is the insulating ring 33 of the roller member 3). In particular, on the back surface side of the glass substrate 6, a strong transparent insulating film 67 formed of an alumina film or a diamond film is further laminated on the ITO film 66, and the presence of the transparent insulating film 67 makes the bottom of the glass substrate 6 The ITO film 66 is not damaged even if it is scraped against the banknote M. Further, the transparent insulating film 67 prevents the ITO film 66 and the metal ring 34 from coming into direct contact when no banknote is present in the banknote transport path 95, thereby preventing the occurrence of an electrical short-circuit phenomenon. Is responsible.
[0046]
  In the present embodiment, as shown in FIGS. 3, 5, and 6, a lens member 68 is provided between the glass substrate 6 and the first and second light receiving members 52 and 53, and the lower surface of the lens member 68. A mask 69 is interposed.
[0047]
  The lens member 68 is made of glass or transparent plastic. Incidentally, although glass is employed as the lens member 68 in the present embodiment, the present invention is not limited to the lens member 68 being made of glass, and may be made of synthetic resin. The lens member 68 is for condensing the light from the irradiation spot P and the monitor spot P1 on each light receiving element 521, 522, 531 to increase the amount of light received, and is a rectangular glass plate in plan view. 68 a, a first convex lens 68 b facing the first light receiving element 521, and a second convex lens 68 c facing the second light receiving element 531, which are swelled on the glass plate 68 a. The first and second convex lenses 68b and 68c are set to have a radius of curvature so that the respective imaging surfaces are located on the lower surfaces of the first light receiving element 521 and the second light receiving element 531 respectively.
[0048]
  The mask 69 is for cutting unnecessary light from the glass substrate 6 through the lens member 68 toward the first and second light receiving members 52 and 53.
[0049]
  In the present embodiment, the AC power supply 30, the roller member 3 and the lead plate 35, the glass substrate 6, the first convex lens 68b, and the first light receiving element 521 are used for security with EL ink containing an EL material. The first detection structure 71 (FIG. 5) for detecting the mark M3 is configured, and the LED 54, the glass substrate 6, the second convex lens 68c, and the second light receiving element 531 are overlapped with the EL ink or A second detection structure 72 (FIG. 6) for detecting the normal ink portion M32 printed with normal ink is formed in the vicinity of the EL ink. The AC power supply 30, the roller member 3 and the lead plate 35, the glass substrate 6, the first convex lens 68b, and the third light receiving element 522 form a third detection structure 73 of the present invention.
[0050]
  Then, the present invention corrects the light intensity detected by the third detection structure 73 according to the difference between this light intensity and a preset reference light intensity, and the authenticity of the banknote M based on the corrected light intensity. Is configured to identify.
[0051]
  Before describing the correction of the light intensity, the printing of the banknote M that is the identification target will be described. FIG. 7 is a perspective view showing an example of a printed state of the banknote M, and FIG. 8 is an enlarged sectional view taken along the line C-C.
[0052]
  A large number of various characters, figures and symbols are printed on the surface of the banknote M, and a security mark M3 and a monitor mark M4 are printed. In the example in FIG. 7, the security mark M <b> 3 is formed on the surface of the banknote M with an English letter “S” and a “horizontal bar” printed so as to intersect the letter “S”. When the banknote M is inserted into the banknote transport path 95 (FIG. 1) of the paper sheet recognition apparatus 1, it is pulled into the back of the banknote transport path 95 by the drive rotation of the transport roller 95c (FIG. 2), and the light received thereby. By the relative movement of the member 51 with respect to the bill M, the portion indicated by the alternate long and short dash line in FIG.
[0053]
  Specifically, the reflected light of the LED 54 irradiated to the irradiation spot P (FIG. 6) of the bill M is received over time by the second light receiving element 531, and the bill conveyance path 95 has an AC electromagnetic field. The light emission of the EL ink at the irradiation spot P due to the environment is received by the first light receiving element 521 over time, and the light emission of the EL ink at the monitor spot P1 is received by the third light receiving element 522 over time. The And the authenticity of the banknote M is identified by the control apparatus 8 based on the light reception result by these 1st and 2nd light-receiving members 52 and 53. FIG.
[0054]
  As shown in FIG. 8, the banknote M includes a paper M1, a coating layer M2 that is coated on the surface of the paper M1 by being coated with a predetermined coating material to smooth the printing surface, and the coating layer. It consists of a security mark M3 formed by printing on the surface of M2, and a monitor mark M4 provided in the vicinity of this security mark M3. The security mark M3 is formed at a position corresponding to the irradiation spot P, and the monitor mark M4 is a straight line extending in the front-rear direction so as to correspond to the front-rear length of the security mark M3 at the position corresponding to the monitor spot P1. It is formed.
[0055]
  The security mark M3 includes an EL ink portion M31 printed with EL ink, and a normal ink portion M32 formed by laminating normal printing ink thereon. In general, the ink of the ink portion M32 is one that does not transmit EL light and emits reflected light having a wavelength different from the wavelength of the EL light.
[0056]
  When the banknote M on which such a security mark M3 is formed is inserted into the banknote transport path 95 of the paper sheet identification device 1, a sensor (not shown) detects this, and the banknote is supplied by power supply from the AC power supply 30 thereby. The space between the roller member 3 and the lead plate 35 in the transport path 95 is set to an AC electromagnetic field environment, and the LED 54 emits light. In this state, the banknote M enters the space between the metal ring 34 of the roller member 3 and the glass substrate 6 by the driving rotation of the transport roller 95c (FIG. 6). The light is passed through 95 and scanned by the light receiving member 51.
[0057]
  In this scanning, when the security mark M3 and the monitor mark M4 (FIGS. 7 and 8) of the banknote M reach the irradiation spot P and the monitor spot P1 (FIG. 6) in the banknote transport path 95, this position is an AC electromagnetic field. Since it is in the environment, the monitor mark M4 emits light, and the EL light is reflected by the first dielectric multilayer film 64 and the second dielectric multilayer film 65 of the glass substrate 6 and proceeds zigzag, and the first convex lens 68b. Is received by the third light receiving element 522, and the EL light from the EL ink portion M31 proceeds in a zigzag manner in the same manner as described above, and is received by the first light receiving element 521 via the first convex lens 68b. The
[0058]
  On the other hand, the light emitted from the LED 54 passes through the first dielectric multilayer film 64 and is irradiated to the normal ink portion M32 of the security mark M3 of the irradiation spot P, and the vertical reflection component is received by the second light receiving element 531.
[0059]
  FIG. 9 is an explanatory diagram for explaining the change over time in the output value proportional to the amount of light received by the first light receiving element 521, the second light receiving element 531 and the third light receiving element 522 by scanning with the light receiving member 51. (A) is a partially enlarged view of the banknote M, and (B) is a graph showing a change with time of the output value of each light receiving element. In FIG. 9 (a), the banknote M is shown in reverse from the state shown in FIG. 7 in order to match the change with time of the output value of (b). Therefore, the lower side of (a) in FIG. 9 is the left side of FIG. 7, and the upper side is the right side.
[0060]
  Further, in the graph of FIG. 9B, the change in the output value of the first light receiving element 521 corresponding to the EL ink portion M31 is shown in the upper stage, and the output of the second light receiving element 531 corresponding to the normal ink portion M32 is interrupted. The change with time of the value is shown in the lower part, and the change with time of the output value of the third light receiving element 522 corresponding to the monitor mark M4 is shown respectively.
[0061]
  In (a) of FIG. 9, the banknote M is moved toward the left in the figure, and from this, the monitor mark M4 is initially set slightly longer than the EL ink portion M31 of the security mark M3. The EL light emission is received by the third light receiving element 522, the EL light emission from the EL ink portion M31 is subsequently received by the first light receiving element 521, and then the reflected light of the LED 54 from the normal ink portion M32 is received by the second light receiving element 531. Thereafter, the light reception of the first light receiving element 521 and the light reception of the second light receiving element 531 are repeated alternately depending on which of the EL ink part M31 and the normal ink part M32 is located at the irradiation spot P. During this time, light reception by the third light receiving element 522 is continued from time “t1” to time “t2”.
[0062]
  In this embodiment, the EL ink portion M31 is printed using EL ink powder that is transparent with visible light having the same reflectance as that of the paper of the banknote M, while the normal ink portion M32 is printed on the banknote M. For example, black printing ink that is darker than the background color of the ink and printed with a material that does not transmit EL light. Therefore, when the banknote M is placed in an AC electromagnetic field environment, for example, it emits blue light having a wavelength of 450 nm, while the blue color is blocked by normal ink in the normal ink portion M32 where normal ink is laminated. There is no external exposure.
[0063]
  Further, the light emitted from the LED 54 becomes negative reflected light in the normal ink portion M32 (that is, the light intensity of the reflected light is smaller than the ground color portion because it is darker than the ground color of the banknote M), Therefore, as shown in (b) of FIG. 9, the change in the output value of the first light receiving element 521 with time and the time of the output value of the second light receiving element 531 between time “t1” and time “t2”. Change means the same behavior.
[0064]
  A change with time in the output value of the first light receiving element 521 (first pattern) and a change with time in the output value of the second light receiving element 531 (second pattern) are set in the control device 8 in advance. The bill M is compared with the bill pattern, and when the correlation coefficient between the two is equal to or greater than a predetermined value, the bill M read by the paper sheet identification device 1 is determined to be genuine.
[0065]
  Therefore, in order for the first pattern and the second pattern of the genuine banknote M, whose authenticity is identified, to be compared with the genuine pattern, it is assumed that there is no large variation in each pattern of the real banknote M. In an actual real banknote M, the printing factory is different, the printing machine is different even in the same factory, and the hue of the security mark M3 changes depending on other factors such as temperature and humidity fluctuations and years of use. There is. This makes it difficult to always identify the authenticity of the banknote M with high accuracy. In particular, although it is a real banknote M, the ratio determined to be fake increases, which may cause the reliability of the paper sheet identification device 1 to be lost.
[0066]
  Therefore, in the present invention, the monitor mark M4 is attached to the banknote M so as to correspond to the security mark M3, and the output value of the EL ink portion M31 is corrected based on the output value of the third light receiving element 522 with respect to the monitor mark M4. So it was converted to a standard one.
[0067]
  The reason for this is as follows. That is, even if the printing conditions and the usage conditions for the security mark M3 are changed, the occurrence of variations in the ink placement on the banknote M of the security mark M3 and the discoloration due to the years of use similarly occurs in the monitor mark M4. Therefore, when reading the banknote M by the paper sheet identification device 1, the monitor mark M4 is read and the output value of the EL ink portion M31 of the security mark M3 is corrected so that the output value matches the genuine reference output value. This is because the security mark M3 is always returned to a state in which variations in ink placement and color fading are corrected, thereby eliminating the inconvenience of being genuine and being identified as a fake.
[0068]
  FIG. 10 is a block diagram showing an embodiment of control processing for correcting the output value of the EL ink portion M31 of the security mark M3 by the control device 8. As shown in FIG. As shown in this figure, the authenticity identification control of the banknote M and the drive control of the paper sheet identification device 1 are performed by a control device 8 having a CPU (Central Processing Unit) 80 therein. The control device 8 is connected to a RAM (Random Access Memory) 81 and a ROM (Read Only Memory) 82.
[0069]
  The RAM 81 is an external storage device that can freely read and write data. The RAM 81 receives time-dependent output values from the first and second light receiving members 52 and 53, predetermined calculation processing results, and the like. Various values of intermediate processing and calculation results are output as necessary. The ROM 82 is a read-only external storage device, and stores a program for performing a correction operation on the EL ink portion M31 of the security mark M3 in advance. When power is supplied to the paper sheet identification device 1 by operating the power switch 96 (FIG. 1), the program in the ROM 82 is loaded on the control device 8.
[0070]
  Then, each time the bill M is inserted into the bill transport path 95, the control device 8 outputs a drive signal to various devices, or an output value from the third light receiving element 522 for the monitor mark M4 according to the above program ( The output value from the first light receiving element 521 for the EL ink portion M31 of the banknote M to be identified is corrected based on the light intensity), and the authenticity identification calculation of the banknote M is performed based on this correction value. .
[0071]
  An LED control circuit 54 a is interposed between the control device 8 and the LED 54. The LED control circuit 54 a controls the turning on / off of the LED 54 based on a control signal from the control device 8. Specifically, when an unillustrated sensor detects that the banknote M has been inserted into the banknote transport path 95, the LED 54 is turned on, and when the banknote M passes through the banknote transport path 95, the LED 54 is turned off. Control is executed at
[0072]
  A first amplifier 521 a and a first A / D converter 521 b are interposed in series between the first light receiving element 521 and the control device 8, and between the second light receiving element 531 and the control device 8. The second amplifier 531a and the second A / D converter 531b are provided in series, and the third amplifier 522a and the third A / D converter 522b are provided in series between the third light receiving element 522 and the control device 8. It is installed. Each of the amplifiers 521a, 531a, and 522a amplifies a weak detection signal from the first to third light receiving elements 521, 531, and 522, and each of the A / D converters 521b and 531b includes each of the amplifiers 521a, 531a. , 522a is converted into a digital signal.
[0073]
  In addition, power supply from the AC power supply 30 to the roller member 3 and the lead plate 35 is performed via an inverter 37. The inverter 37 converts AC power supplied from the AC power source 30 into an alternating voltage having a predetermined voltage and frequency and supplies the alternating voltage to the roller member 3 and the lead plate 35. Based on a control signal output from the CPU 80. The alternating voltage is turned on and off, and the voltage value and frequency when the alternating voltage is turned on are set.
[0074]
  When the output values of the first to third light receiving elements 521, 531 and 522 processed as described above are digitized and input to the control device 8, the CPU 80 targets the input output values. Predetermined arithmetic processing is performed, and the digital output values from the first light receiving element 521 and the second light receiving element 531 are corrected in accordance with the digital output value from the third light receiving element 522. Authenticity is determined.
[0075]
  In order to perform such processing, the CPU 80 has light intensity comparison means 80a for comparing and calculating a digital output value (light intensity) from the third light receiving element 522 and a reference light intensity that is preset and stored in the RAM 81. And a light intensity converting means 80b for correcting the output values from the first and second light receiving elements 521 and 531 and converting them into corrected output values based on the comparison result by the light intensity comparing means 80a. ing. Further, the CPU 80 is provided with authenticity determination means 80c for determining the authenticity of the banknote M. The authenticity determining means 80c is configured to determine authenticity by a predetermined calculation process based on the corrected output values of the first and second light receiving elements 521 and 531 read from the banknote M and corrected by the light intensity converting means 80b. Has been. Details of the light intensity comparison means 80a, light intensity conversion means 80b, and authenticity determination means 80c will be described later with reference to FIG.
[0076]
  Then, the result of authenticity determination by the authenticity determination means 80c is output toward the indicator lamp 98, and is passed through the bill conveyance path 95 by visually observing which of the pass lamp 98b and the reject lamp 98c is lit. You can know the authenticity of the banknote M. Moreover, it can visually recognize that the paper sheet identification apparatus 1 can accept the banknote M by lighting of the ready lamp 98a.
[0077]
  Further, the control device 8 is provided with a drive control circuit 84 that outputs a drive signal to various devices (such as the conveyance roller 95c and a flapper not shown) installed in the paper sheet identification device 1. In response to a control signal from the control device 8 via 84, devices at various locations in the paper sheet identification device 1 operate in cooperation with each other.
[0078]
  A detection signal indicating the rotation speed of the roller member 3 (specifically, the number of passes per unit time at the detection position of the striped pattern provided on the outer peripheral surface of the metal ring 34) is output from the photo reflector 36. The timing pulse corresponding to this input value is output to each A / D converter 521b, 531b, 522b via a timing pulse generation circuit (not shown). The timing pulse generating circuit provides each A / D converter 522, 532 with a so-called timing signal indicating a time interval when converting an analog signal into a digital signal. The first value or the average value of the analog quantity in the interval is a digital value.
[0079]
  Hereinafter, the authenticity identification processing of the banknote M in the control device 8 will be described based on FIGS. 11 and 12. FIG. 11 is a flowchart showing a flow of a data sampling routine for reading the paper surface of the banknote M by the light receiving member 51, and FIG. 12 is a flowchart showing a flow of a correlation calculation routine for determining authenticity from the read data. .
[0080]
  First, based on FIG. 11, a photoelectric conversion output signal (analog signal detected by the first light receiving element 521 and the second light receiving element 531) from the light receiving member 51 is taken into a predetermined storage device or RAM 81 in the control device 8. The procedure will be described. When the data sampling routine starts in step S1 (S1), the CPU 80 calls and starts execution of a program stored in the ROM 82, and initializes each mechanism (register, counter, flapper, etc.) according to the program (S2). At the same time, control of the bill transport mechanism by the drive control circuit 84 is started. When the banknote M to be identified is inserted into the banknote transport path 95 in this state, a sensor (not shown) detects this, and the CPU 80 outputs a signal for driving the transport roller 95c via the drive control circuit 84 and an inverter. 37 and the LED control circuit 54a to output a drive signal, a predetermined alternating voltage from the AC power supply 30 is supplied to the roller member 3 and the lead plate 35, and the bill conveyance path 95 becomes an AC electromagnetic field environment (S3). Then, an LED lighting signal is output from the LED control circuit 54a, and the LED 54 is lit (S4).
[0081]
  Subsequently, the banknote M inserted into the banknote transport path 95 by the driving rotation of the transport roller 95c advances in the banknote transport path 95, and the banknote M enters between the bottom surface of the glass substrate 6 and the peripheral surface of the roller member 3. Then, the roller member 3 is rotated around the central axis 31. The rotation speed of the roller member 3 is detected as a pulse signal corresponding to the striped pattern by a photo reflector 36 that irradiates the outer peripheral surface of the metal ring 34 having a striped pattern and receives the reflected light. The analog output values of the first to third light receiving elements 521, 531 and 522 are amplified by the first to third amplifiers 521a, 531a and 522a in synchronization with the pulse signal by the control signal from the CPU 80 based on the first to first amplifiers 521a, 531a and 522a. The signals are converted into digital signals by the third A / D converters 521b, 531b, and 522b (S5).
[0082]
  Incidentally, the amplification factors of the first to third amplifiers 521a, 531a and 522a are preset in advance. The initially set analog light intensity from the third amplifier 522a (that is, the light intensity of the monitor mark M4) is digitally converted to the monitor light intensity PD3 by the third A / D converter 522b, and the monitor light intensity PD3 is It is compared with the reference light intensity th previously stored in the RAM 81 (S6). The reference light intensity th is set to a minimum light intensity value assumed for the EL ink portion M31 of the banknote M.
[0083]
  In step S6, it is asked whether or not the monitor light intensity PD3 is greater than the reference light intensity th. If “PD3 ≧ th”, it is determined that the third light receiving element 522 is receiving the light emitted from the monitor mark M4. After S7 and subsequent steps are executed, the raw digital light intensity from the first light receiving element 521 (corresponding to the EL ink portion M31) is converted into the corrected light intensity, and then stored as data in the storage device. , When “PD3 <th”, the third light receiving element 522 skips to step S13 on the assumption that the light emission from the monitor mark M4 is not received (that is, the monitor mark M4 does not exist in the monitor spot P1), Returned to S3.
[0084]
  In step S7, the light intensity comparison means 80a calculates the deviation between the monitor light intensity PD3 and the reference light intensity th, and the light intensity conversion means 80b calculates the ratio of the deviation to the reference light intensity th. This value is set as an amplification factor (gain) (S8). Next, the CPU 80 takes in the outputs from the first and second light receiving elements 521 and 531 at the timing of the pulse signal from the photo reflector 36, and uses each output value multiplied by the gain as a corrected output value (first light receiving). The correction output value from the element 521 is set as the first correction output value PD1, and the correction output value from the second light receiving element 531 is set as the second correction output value PD2), which are sequentially stored in a predetermined storage device (for example, the RAM 81). (S10).
[0085]
  This storage is performed as follows. In other words, one working area for temporarily storing the first correction output value PD1 from the first light receiving element 521 in advance in the storage device, and the value of the first correction output value PD1 are sequentially stored. The storage area D1 (i) (i (storage address) = 1 to n) is set in advance, and the second correction output value PD2 is temporarily temporarily set in the same manner for the digital signal from the second light receiving element 531. The second working area to be stored and the second storage area D2 (j) (j (storage address) = 1 to n) are set in advance.
[0086]
  Each time the first correction output value PD1 and the second correction output value PD2 from the first and second light receiving elements 521 and 531 are sent, the pulse signal output from the photo reflector 36 is counted and the storage address is sequentially set. The values are sequentially stored in the first storage area D1 (i) and the second storage area D2 (j) (i = i + 1, j = j + 1) while shifting (S10 to S12), and after the monitor mark M4 When it is detected from the count result of the signal from the photo reflector 36 that the end has passed the monitor spot P1 (FIG. 6) (S13), it is determined that the data sampling has been completed, and the reading operation of the bill M is completed. To do.
[0087]
  The light intensity of the security mark M3 read by the first and second light receiving elements 521 and 531 in this way is based on the gain obtained by the comparison calculation with the reference light intensity th read by the third light receiving element 522. In the first storage area D1 (i) and the second storage area D2 (j), which are corrected to the first correction output value PD1 and the second correction output value PD2, and stored while sequentially shifting the correction output values PD1 and PD2. Since the authenticity of the banknote M is identified based on the data, the inconvenience of being identified as a fake though it is a real banknote M is certain due to variations in the ink placement of the security mark M3 and fading due to long-term use of the banknote M. The authenticity recognition rate of the banknote M is improved.
[0088]
  When the reading of the security mark M3 of the banknote M is completed, a correlation calculation routine for determining the authenticity of the banknote is then executed. This calculation is performed by the authenticity discrimination means 80c. This will be described below with reference to FIG. At the stage where this routine is executed, the n corrected light intensities from the first and second light receiving elements 521 and 531 in the first storage area D1 (i) and the second storage area D2 (j). Each value is stored.
[0089]
  When the correlation calculation starts (S20), the data in the first storage area D1 (i) and the second storage area D2 (j) of the RAM 81 are read out to the authenticity determination means 80c (S21). Each read data is subjected to binarization processing (S22). Subsequently, for the binarized data, the absolute value Dn of the difference is obtained for each corresponding address, and this operation is stored. It repeats about all the data which exist (S23-S25).
[0090]
  When the above operation is completed (YES in S25), the sum D of the absolute value Dn of each difference is calculated (S26), and the value D is compared with a preset minute value α (S27). As a result of the comparison, if the value of D is less than or equal to the minute value α, it is determined that the two patterns detected by the first and second light receiving elements 521 and 531 match, and the authenticity determination means 80c determines the bill M On the other hand, when the value of D exceeds the minute amount α, the banknote M is determined to be fake (S29).
[0091]
  In addition, in order to further improve the authenticity identification accuracy of the banknote M, the above calculation may be performed using multilevel data. In addition, two patterns (detection patterns over time obtained by detecting the EL ink portion M31 and the normal ink portion M32 by the first and second light receiving elements 521 and 531 (see (b) in FIG. 9)) are compared. In addition, if authentication is made by comparing them with a predetermined pattern stored in advance in the ROM 82, authentication with further improved accuracy can be realized. In addition, in the comparison of two patterns, a ratio may be obtained instead of obtaining the difference between the two.
[0092]
  As described above in detail, in the present invention, when measuring the emission luminance (emission intensity) of the EL ink, the monitor mark M4 is used, and the EL ink of the security mark M3 is based on the emission luminance of the monitor mark M4. Since the light emission luminance of the portion M31 is corrected, the variation in light emission of the EL ink portion M31 due to ink application at the time of printing or fading due to use, etc. is eliminated, and the accuracy of authenticity identification can be improved.
[0093]
  In the above embodiment, the dedicated monitor mark M4 is provided separately from the security mark M3 for monitoring. However, the security mark may be hidden in the security mark M3. It is also possible to use the first part of the security mark M3 as the monitor mark M4. In this case, the first EL emission luminance of the security mark M3 may be stored, and the detected light intensity may be corrected based on this. By doing so, there is no need to provide a dedicated monitor mark M4.
[0094]
  The same effect can be achieved by changing the output voltage value and oscillation frequency of the circuit of the inverter 37 instead of changing the amplification factors of the amplifiers 521a and 531a. In addition, by setting a monitor mark for normal ink and detecting the reflected light to detect the change in the ink due to wear or fading, etc., correction can be realized with higher accuracy. .
[0095]
  In the above embodiment, the EL light emission of the EL ink portion M31 of the banknote M and the reflected light of the LED 54 from the normal ink portion M32 are received by the first light receiving element 521 and the second light receiving element 531 respectively. However, instead of this, both the EL light emission and the LED reflected light are received by one light receiving element, and the data of the security mark M3 is accumulated in the first storage area D1 (i) and the second storage area D2 (j). It is also possible to do. However, in this case, it is necessary to time-shift the data collection of EL emission for the EL ink portion M31 and the data collection of reflected light of the LED 54 for the normal ink portion M32.
[0096]
  Hereinafter, a case where EL light emission and LED reflected light are combined with one light receiving element will be described with reference to FIG. FIG. 13 is a flowchart showing an embodiment in the case where data collection of the security mark M3 is performed by one light receiving element. Note that FIG. 10 is referred to for convenience in the description based on FIG. 13, but the first and second light receiving elements 521, 531, the first and second amplifiers 521 a, 531 a and the first and second A / In this embodiment, each of the D converters 521b and 531b is covered by one light receiving element, an amplifier, and an A / D converter. Moreover, when the member of previous embodiment is common with the member of this embodiment, it demonstrates with reference to other drawings as needed.
[0097]
  As shown in the flowchart of FIG. 13, when the data sampling routine is started (S30), the CPU 80 starts executing the program, initializes each unit device, sets the transport mechanism to the operation standby state, and sets various counters, The flag and register are cleared or initialized to perform so-called initialization (S31).
[0098]
  Next, when the banknote M is inserted into the banknote transport path 95, the sensor detects this, and the CPU 80 outputs a signal for starting the transport of the banknote M and outputs a signal for starting the oscillation operation to the inverter 37. Then, in order to detect EL light, a signal for setting the amplification factor of the amplifier to a high value is output to the amplifier circuit (S33).
[0099]
  When the banknote M inserted into the banknote transport path 95 (FIG. 1) reaches the irradiation spot P (FIG. 6), the roller member 3 rotates as the banknote M is transported, and the transport speed of the banknote M from the photo reflector 36 is increased. Is output to the CPU 80. Meanwhile, the amplifier amplifies the output of the light receiving element in synchronization with the pulse signal from the photoreflector 36, and the A / D converter digitizes this amplified signal (S34).
[0100]
  Next, the output (monitor light intensity PD3) of the third light receiving element 522 is compared with the reference light intensity th stored in the RAM 81 in advance (S35), and the monitor light intensity PD3 is larger than the reference light intensity th. Is determined that the light receiving element has received the light emitted from the EL ink portion M31, the process proceeds to step S36, and the gain is calculated and set in the same manner as described above by comparing the monitor light intensity PD3 and the reference light intensity th (S36 to S36). In S37, the corrected output value PD of the EL ink portion M31 calculated based on this gain is stored in the first storage area D1 (i) (S39).
[0101]
  On the other hand, when the value of the monitor light intensity PD3 is smaller than the reference light intensity th, it is determined that the third light receiving element 522 has not received the EL light yet, skipping to step S49 and performing the routine from step S32. Repeated.
[0102]
  When the corrected output value PD is stored in the first storage area D1 (i) in step S39, the CPU 80 counts the pulses output from the photoreflector 36 (S40) and adds the variable 1 (S41). After that, a signal for stopping the oscillation of the alternating voltage from the circuit is output to the inverter 37. Thereby, the drive of the inverter 37 is stopped (S42). Up to this point, the flow is for fetching the light emission data of the EL ink portion M31 into the first storage area D1 (i).
[0103]
  Next, a flow is started in which the LED reflected light data reflected from the normal ink portion M32 is taken into the second storage area D2 (j) from step S44. That is, in order to detect the pattern of the normal ink portion M32, the CPU 80 outputs a control signal to the LED control circuit 54a, and thereby the LED 54 is lit (S43). Also in this case, the gain is set in the same manner as described above for the LED light received by the light receiving element (S44), and the obtained amplified light intensity is subjected to A / D conversion (S45) to correct the reflected light. The output value PD is calculated, and this corrected output value PD is stored in the second storage area D2 (j) one by one (S46).
[0104]
  Next, the pulses from the photo reflector 36 are counted (S47 to S48), and it is determined whether or not the pulses from the photo reflector 36 are output for a certain time (S49). When it is determined that the transfer of M has been completed, the process ends (S50), and when it is output, the process returns to step S32 and the subsequent routines are repeatedly executed.
[0105]
  In this way, by detecting the light intensity of the EL ink portion M31 and the normal ink portion M32 alternately in accordance with the pulse from the photo reflector 36, the first storage area D1 (i) and the second storage area are one light receiving element. It becomes possible to store the data for authenticity identification in the storage area D2 (j).
[0106]
  14A and 14B are explanatory diagrams for explaining other embodiments of the security mark, in which FIG. 14A is a partially enlarged view of the banknote M, and FIG. 14B is a graph showing temporal changes in output values of the respective light receiving elements. It is. In this embodiment, as shown in FIG. 14A, in addition to the EL ink portion M31 and the normal ink portion M32 which are overcoated in the previous embodiment as a security mark M3 ′, a normal non-light-emitting ink is used. The second normal ink portion M33 printed in (1) is provided. The second normal ink portion M33 is adjacent to the laminated and printed ink portions M31 and M32 in the width direction, and is arranged in parallel on the opposite side of the monitor mark M4.
[0107]
  In the example shown in FIG. 14A, the letter “C” in the normal ink portion M32 and the letter “A” in the second normal ink portion M33 are visible, but “E” in the EL ink portion M31 is visible. "And the bar-shaped monitor mark M4 are printed with EL ink having spectral characteristics similar to the reflection characteristics of the paper for the banknote M, and thus cannot be visually recognized by the naked eye.
[0108]
  On the other hand, as shown in FIG. 14A, the light receiving member 51 ′ has reflected light from the second normal ink portion M33 in addition to the first to third light receiving elements 521, 531 and 522 of the previous embodiment. A fourth light receiving element 532 for receiving the light is provided.
[0109]
  According to the security mark M3 ′, an output value as shown in FIG. 14B is obtained from each of the light receiving elements 521, 522, 531 and 532 by scanning the security mark M3 ′ by the light receiving member 51 ′.
[0110]
  Incidentally, in (b) of FIG. 14, the upper graph is a change with time in the output value of the reflected light from the second normal ink portion M <b> 33 received by the fourth light receiving element 532. In the middle graph, the output value of the light emission from the EL ink part M31 received by the first light receiving element 521 is indicated by a dotted line, while the reflected light of the normal ink part M32 received by the second light receiving element 531 is shown. It is shown with a solid line. Further, the lower graph shows the change with time of the output value of the light emission of the monitor mark M4 received by the third light receiving element 522.
[0111]
  As in this embodiment, in addition to the EL ink portion M31 and the normal ink portion M32 as the security mark M3 ′, the second normal ink portion M33 printed with a normal non-light-emitting ink is provided, whereby the authenticity of the banknote M is provided. It becomes possible to further improve the accuracy of identification.
[0112]
【The invention's effect】
  Claim 1Paper sheets identified by the paper sheet identification deviceAccording to the above, the security mark is printed on the paper sheet using both the luminescent ink and the normal non-luminescent ink, and the print tone of the security mark is monitored together with or in the vicinity of the security mark.forSince the monitor mark is printed with light-emitting ink, when the paper sheet identification device that previously stores the reference light intensity reads the security mark on the paper sheet, the monitor mark that emits light in the specified environment must be read first. Thus, it is possible to know the print tone of the security mark by comparing the light intensity of the read monitor mark and the reference light intensity, and it is possible to perform correction based on the above comparison result of the read security mark. Standardization of emission intensity data from security marks can be performed.
[0113]
  Therefore, in the authenticity determination of paper sheets based on the luminescence intensity data that varies from the read security mark, the conventional inconvenience that the determination accuracy is inferior due to the above-mentioned variation is eliminated, and the authenticity identification accuracy of the paper sheets is improved. Can be made.
[0114]
  Specifically,Claim1DescribedPaper sheet identification deviceAccording to the above, since the paper sheets supplied to the identification device are placed in a predetermined environment, the monitor mark made of luminescent ink emits light, and this light emission is received by the third light receiving means. The light intensity of the monitor mark received by the means is compared with a reference light intensity set in advance by the light intensity comparison means, and a deviation is calculated. Based on the calculation result, the light intensity conversion means outputs the deviation from the first light receiving means. Can be converted into a corrected output value corresponding to the deviation. Based on this corrected output value, the authenticity determination means can determine the authenticity of the paper sheet.
[0115]
  Thus, prior to determining the authenticity of the paper sheet, it is sent to the authenticity determining means as an electric signal in a state in which the density of the luminescent ink of the printed monitor mark is corrected to a standard one, Here, since the predetermined authenticity determination process is performed, the inconvenience that the difference in the ink placement of the luminescent ink on the paper sheet affects the authenticity determination result is eliminated, and proper authenticity determination can always be realized.
[0116]
  Claim2According to the described invention, an AC electromagnetic field environment formed by applying an alternating voltage as a predetermined environment is adopted, and electroluminescence that emits light in the AC electromagnetic field environment is used as the luminescent ink. Sense emits light in an AC electromagnetic field environment, but does not emit light in a normal environment and is colorless. Therefore, when authenticity is identified, it can function effectively and normally use paper sheets without any problem. it can.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a paper sheet identification apparatus according to the present invention, showing a state in which a casing lid is closed.
FIG. 2 is a perspective view of the paper sheet identification device of FIG. 1, showing a state in which a casing lid is opened.
FIG. 3 is an exploded perspective view showing an embodiment of an apparatus main body housed in a casing.
4 is an assembled perspective view of the apparatus main body of FIG. 3. FIG.
FIG. 5 is a cross-sectional view taken along line AA in FIG.
6 is a cross-sectional view taken along line BB in FIG.
FIG. 7 is a perspective view showing an example of a printed state of banknotes.
FIG. 8 is an enlarged cross-sectional view taken along line CC of FIG.
FIG. 9 is an explanatory view showing a change with time in output value proportional to the amount of light detected by the first light receiving element and the second light receiving element by scanning with the light receiving element, and (A) is a partially enlarged view of the banknote M; (B) is a graph showing the change with time of the output value of each light receiving element.
FIG. 10 is a block diagram showing an embodiment of control processing for correcting the output value of the EL ink portion of the security mark by the control device.
FIG. 11 is a flowchart showing a flow of a data sampling routine for reading the paper surface of the banknote M by the light receiving element.
FIG. 12 is a flowchart showing a flow of a correlation calculation routine for determining authenticity from read data.
FIG. 13 is a flowchart illustrating an embodiment in the case of collecting security mark data with a single light receiving element.
FIG. 14 is an explanatory diagram showing another embodiment of the security mark and the arrangement of light receiving elements suitable for detection thereof.
[Explanation of symbols]
  1 Paper sheet identification device 2 Device body
  20 Sensor device 3 Roller part
  30 AC power supply 31 Central axis
  32 Metal disk 33 Insulation ring
  34 Metal ring 35 Lead plate
  35a Lead plate body 35b Electrode piece
  36 Photo reflector 4 Sensor housing
  41 Case body 42 Funnel-shaped part
  43 Substrate mounting recess 44 Funnel-shaped part
  45 Light path hole 46 LED mounting hole
  47 Lead plate mounting recess 5 Board
  51, 51 ′ Light receiving member 521 First light receiving element
  522 Third light receiving element 531 Second light receiving element
  532 Fourth light receiving element
  52a Bandpass filter
  521a, 531a, 522a First to third amplifiers
  521b, 531b, 522b First to third A / D converters
  54 LED 54a LED control circuit
  6 Glass substrate 60 Glass prism
  60a right slope 60b top
  61 First glass substrate 61a Inclined surface
  62 Second glass substrate 63 Third glass substrate
  64 First dielectric multilayer film 65 Second dielectric multilayer film
  66 ITO film 67 Transparent insulating film
  71 First detection structure 72 Second detection structure
  8 Control device 80 CPU
  80a Light intensity comparison means 80b Light intensity conversion means
  80c authentication means
  81 RAM 82 ROM
  84 Drive control circuit 9 Casing
  91 Casing body 91a Roller insertion window
  92b Rectangular window 92c Inclined edge
  93 Bracket 94 Horizontal axis
  95 Banknote transport path 95a Guide ridge
  95b Long groove 95c Conveying roller
  95d Auxiliary roller 96 Power switch
  97 Discharge direction selector switch
  98 Indicator light 98a Ready lamp
  98b Pass lamp
  M banknote M1 paper
  M2 coating layer M3 printing ridge
  M31 EL ink part M32 Normal ink part
  P Irradiation spot P1 Monitor spot

Claims (2)

A security mark is printed using both a luminescent ink that emits light when placed in a predetermined environment and a normal non-luminescent ink, and a security tone printing tone with and / or in the vicinity of the security mark A paper sheet identification device for identifying the authenticity of a paper sheet on which a monitor mark for monitoring the color is printed with luminescent ink by scanning in the extending direction of the monitor mark,
First light receiving means for receiving light emitted from the light emitting ink of the security mark by being placed in a predetermined environment, second light receiving means for receiving reflected light from the non-light emitting ink of the security mark, and light emission from the monitor mark And a third light receiving means for receiving light,
The first and second light receiving means are arranged to receive light from the same position of the paper sheet,
A light intensity comparing means for comparing a light intensity received by the third light receiving means with a preset reference light intensity to calculate a deviation from the reference light intensity; and an output value from the first light receiving means as described above. A paper sheet identifying apparatus comprising: a light intensity converting means for converting to a corrected output value corresponding to the deviation; and a authenticity determining means for determining the authenticity of the paper sheet based on the corrected output value. . The predetermined environment is an AC electromagnetic field environment formed by applying an alternating voltage, and the luminescent ink uses electroluminescence that emits light in an AC electromagnetic field environment. The paper sheet identification apparatus according to claim 1 .

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