JP2002074450A - Paper sheet identification device - Google Patents

Abstract

(57) [Problem] To provide a composite identification system that performs both reception of reflected light and the like and reception of light emission so that deterioration of paper sheets can be effectively suppressed. SOLUTION: An alternating voltage applying means for applying an alternating voltage to a predetermined counter electrode, a light receiving member 51 for receiving light from a lighting spot P of a bill M being conveyed in an AC electromagnetic field environment, and the light receiving member An optical separating unit for separating the light received by the fluorescent light into those from the fluorescent ink and those other than the fluorescent ink; an alternating voltage control unit for controlling the driving of the alternating voltage applying unit; Authenticity discriminating means for discriminating the authenticity of the bill M is provided, and the alternating voltage control adding means detects when the light receiving member 51 is receiving light from the fluorescent ink from the separation result by the optical separating means. Is configured to drive the alternating voltage application means only when the

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet identifying apparatus for identifying authenticity of various kinds of paper sheets, for example, securities such as banknotes and stock certificates, and various kinds of slips.

[0002]

2. Description of the Related Art Conventionally, there has been known a paper sheet identification device for identifying the authenticity of paper sheets such as bills and securities. Such an identification device optically reads characters, figures, symbols, and patterns (hereinafter, referred to as patterns, etc.) printed on various parts of a paper sheet, converts them into electric signals, and replaces them with real patterns, etc. stored in advance. It is common to identify authenticity by comparing.

[0003] However, in recent years, since forgery techniques have become more sophisticated, it has become difficult to determine the authenticity of only ordinary printed patterns.
As described in No. 6099A2, a material that emits fluorescence in response to ultraviolet light or an alternating voltage (electroluminescence (hereinafter referred to as E)
Banknotes may be printed with luminescent ink using L))). When such a luminescent ink is used, the paper sheet emits light by irradiating it with ultraviolet light or placing it in an AC electromagnetic field, so that the pattern or the like by ordinary printing matches the authentic paper sheet. Even by detecting the presence or absence of this light emission, the authenticity can be identified.

[0004] In addition to this, light emission from the paper sheet itself caused by corona discharge caused by being placed in a high-voltage AC electromagnetic field environment is detected and compared with the light emission pattern of genuine paper sheet to verify authenticity. May be added to the above-described optical reading method for patterns and the like.

According to the identification device adopting such a composite system, even if the printed pattern or the like matches the authentic paper, the authenticity can be identified by the light emission from the paper itself by corona discharge. Thus, double checking is performed on paper sheets, and it is expected that authenticity identification can be performed with higher accuracy.

[0006]

By the way, in the above-described composite system of paper sheet identification, paper sheets are first conveyed toward a preset high-voltage AC electromagnetic field environment, and The light receiving element receives the light emitted and reflected from the portion that has reached the lighting spot of the light source. In this case, the paper leaves a high piezoelectric magnetic field while passing through the sensor for identification. There is a problem in that the paper is exposed to the environment, thereby deteriorating the paper sheets.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and in a composite identification system which performs both reception of reflected light and the like and reception of light emission, deterioration of paper sheets is effectively suppressed. It is an object of the present invention to provide a paper sheet identification device capable of performing such operations.

[0008]

According to the first aspect of the present invention,
A paper sheet identification device that identifies the authenticity of paper sheets that have been printed using fluorescent ink that emits light when placed in an alternating electromagnetic field environment and emits fluorescence when irradiated with light of a predetermined wavelength. An alternating voltage applying means for applying an alternating voltage to a predetermined counter electrode to form the AC electromagnetic field environment, and light from a lighting spot of a sheet being conveyed in the AC electromagnetic field environment. A light receiving unit for receiving light, a light irradiating unit for irradiating light of a predetermined wavelength toward the lighting spot, and an optical unit for separating the light received by the light receiving unit into one from the fluorescent ink and the other. Separating means, alternating voltage control means for controlling the driving of the alternating voltage applying means, and authenticity judging means for judging the authenticity of the paper sheet based on the output value of the light receiving means, wherein the alternating voltage control means is provided. Is characterized in that said light receiving means is configured to drive only the alternating voltage applying means when it is determined that receives light from the fluorescent ink.

According to the present invention, the sheet is conveyed toward the lighting spot in a state where the light from the light irradiating means is irradiated on the lighting spot, so that the light receiving means can reduce the reflected light from the sheet. The wavelength distribution is optically separated and received. The optical separating means has wavelength selectivity so that the light receiving means receives light from the fluorescent ink due to the difference in wavelength distribution. The alternating voltage control means determines the detection signal and outputs a control signal to the alternating voltage applying means only when the emission of the fluorescent ink is recognized, whereby the lighting spot becomes an AC electromagnetic field environment. .

Accordingly, the fluorescent ink on the paper sheet located at the lighting spot emits light, and the emitted light is received by the light receiving means and input to the authenticity determining means. Determine the authenticity of the leaves.

Since the alternating voltage is applied to the sheet only when the fluorescent ink is located at the lighting spot, the sheet is placed on the lighting spot set in a high-voltage AC electromagnetic field environment from the beginning. The time during which the paper is exposed to the high-voltage AC electromagnetic field is shorter than when it is transported, thereby minimizing the impact on the paper due to the longer exposure time, and performing an authenticity identification operation. This avoids inconveniences such as the paper sheets being quickly deteriorated and the life of the insulator being shortened.

According to a second aspect of the present invention, in the first aspect of the present invention, the authenticity identifying means includes a light reflected by a light spot of the light emitted from the light irradiation means and received by the light receiving means, and a light emission of the fluorescent ink. And that the authenticity is determined based on each output value.

According to the present invention, the fluorescent ink on the paper sheet emits light in the lighting spot set in the AC electromagnetic field environment, and the emitted light is received by the light receiving means and input to the authenticity discriminating means. The reflected light (fluorescence) at the light spot from the light irradiating means is also input to the authenticity determining means via the light receiving means, and the authenticity determining means determines the authenticity of the paper sheet based on both output values. The accuracy of identification is improved.

[0014]

1 and 2 are perspective views showing an embodiment of a paper sheet identification apparatus according to the present invention.
Shows a state where the casing lid is closed, and FIG. 2 shows a state where the casing lid is opened. Also,
FIG. 3 is an exploded perspective view showing an embodiment of an apparatus main body housed in a casing, and FIG. 4 is an assembled perspective view thereof. FIG. 5 is a sectional view taken along line AA of FIG. 1 to 4, the XX direction is the width direction, and the YY
The direction is referred to as the front-rear direction, in particular, the -X direction is referred to as left, the + X direction is referred to as right, the -Y direction is referred to as front, and the + Y direction is referred to as rear.

The paper sheet identification apparatus 1 of the present embodiment emits an EL (el. EL) which emits light when placed in an environment of an AC electromagnetic field.
This is to identify the authenticity of a banknote (sheets) M on which characters, figures, or symbols have been printed by using both an eccentricity ink and a normal printing ink. In order to perform this identification, the paper sheet identification apparatus 1 includes a first detection structure 71 and a second detection structure
2 is furnished. The first detection structure 71 detects EL light emission in an AC electromagnetic field environment, and the second detection structure 72 detects reflected light of normal ink.

As shown in the above figures, the paper sheet identification device 1
The device main body 2 and the control device 8 are box-shaped casing 9
The interior is formed. The casing 9 includes a rectangular parallelepiped casing body 91 and a lid 92 provided on an upper portion of the casing body 91.

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 main body 91. The lid 92 has a rear end portion sandwiched between the pair of brackets 93. By being rotatably supported around the horizontal shaft 94, the closed posture folded over the casing main body 91 shown in FIG. 1 and the open posture standing upright at the rear end of the casing main body 91 shown in FIG. The posture can be changed with.

In the state where the lid 92 is set in the closed position, a bill passing slit 95 is formed between the upper surface of the casing body 91 and the lower surface of the lid 92 as shown in FIG. From the front of this bill passing slit 9
When the bill M is inserted into the counter 5, a predetermined sensor (consisting of the detection LED 55 and the detection light receiving element 56 opposed thereto) detects this, and the controller 8 based on this detection signal outputs The bill M is drawn into the bill passage slit 95 by the driving of the drive mechanism by the drive signal, and the authenticity is identified by the identification mechanism (the first detection structure 71 and the second detection structure 72) described in detail after being installed in the apparatus main body 2. It is supposed to be.

The detection LED 55 is shown in FIGS.
As shown in the figure, the light receiving element 56 for detection is provided at the center in the width direction at the front position of the bottom plate 92a of the lid 92, while facing the LED 55 for detection on the top plate 950 of the casing body 91. The cover 92
When the light path of the detection LED 55 is interrupted in a state where the banknote M is closed, the light reception of the detection light-receiving element 56 is interrupted to detect that the bill M is inserted into the bill passage slit 95.

A plurality of guide projections 95a extending in the front-rear direction are provided on the upper surface of the casing body 91 in the bill passing slit 95, and a long groove 95b is formed between the adjacent guide projections 95a. The guide ridge 95a and the elongated groove 95b form a top plate 950 of the casing body 91 as a transport passage for the banknote M.

The plurality of elongated grooves 95b are provided with cutout windows at respective front and rear positions, from which the top of the transport roller 95c is projected, as shown in FIG. A pair of front and rear auxiliary rollers 95d facing the transport roller 95c is provided on the back side of the transport roller 92c.
In a state of being sandwiched between c and the auxiliary roller 95d, the sheet passes through the bill passage slit 95 by the driving rotation of the transport roller 95c, and is drawn out from the rear end of the bill passage slit 95 to the outside.

A power switch 96 is provided in front of the right side of the casing body 91. An indicator lamp 98 is provided at a position in front of the top of the lid 92. The display lamp 98 includes a ready lamp 98a that indicates whether the paper sheet identification device 1 is in a usable state and a pass lamp 98b that indicates that the authentication result of the bill M is passed. A reject lamp 98c for indicating rejection. 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, and when the apparatus main body 2 is in the process of identification, the ready lamp 98a is turned off. Thus, it can be understood that the next bill insertion should be withheld until the ready lamp 98a is turned on.

As shown in FIGS. 3 to 5, the device main body 2 is a sensor device (mainly a first device) in which a light receiving element and a light emitting element, which will be described later, as well as an optical member and a wiring board are integrally integrated. (Including a detection structure 71 and a second detection structure 72), and the roller member 3 provided inside the casing body 91 and the cover 92 provided inside the lid 92 so as to face the peripheral surface of the roller member 3. And a sensor housing 4 on which various sensors and substrates are mounted.

The roller member 3 is one of the electrodes to which the alternating voltage from the AC power supply 30 (FIG. 5) is applied. The top of the roller member 3 and a glass substrate 6 described later
A light spot P is formed between the roller member 3 and the paper money M is supplied between the roller member 3 and the glass substrate 6. It is designed to receive light. The roller member 3 is fixed to the center shaft 31 concentrically and integrally with a metal center shaft 31 extending in the width direction which is rotatably supported on a predetermined bearing in the casing main body 91 around its own axis. A metal disk 32 and an insulating ring 33 made of a high dielectric constant material such as barium titanate (BaTiO ₃ ) concentrically press-fitted onto the metal disk 32.

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 plate-shaped lead plate main body 35a and a bent piece 35b formed by bending the front end of the lead plate main body 35a downward. Then, the bent piece 35b and an ITO film 66 (a conductive film deposited on the bottom surface of the glass substrate 6) described later are electrically connected by a conductive paste (not shown) and inserted into the bill passage slit 95. An alternating voltage from the AC power supply 30 is applied to the banknote M in the state via the roller member 3 and the ITO film 66, whereby an AC electromagnetic field is formed in the banknote passing slit 95.

On the other hand, a rectangular roller insertion window 91a (FIG. 2) is formed in the casing body 91 at the center of the top plate 950, and the insulating ring 33 of the roller member 3 is inserted through the roller insertion window 91a. Project outside. The roller member 3 is urged upward by the urging force of an unillustrated urging means, so that the top is positioned higher than the guide protrusion 95a.

The insulating ring 33 is provided with a stripe pattern at a predetermined pitch crossing the outer peripheral surface of the insulating ring 33 in the direction in which the axis extends. A reflector 36 (FIG. 5) is provided. The photo-reflector 36 is configured to project light on the outer peripheral surface of the insulating ring 33 and receive the reflected light.
This is for detecting the rotation speed of.

The sensor housing 4 includes a housing main body 41 having a square shape in plan view and a predetermined thickness, and a housing main body 4 having a predetermined thickness.
An inverted quadrangular pyramid-shaped funnel-shaped part 4 integrally connected to the lower part of 1
2 is formed. On the other hand, the bottom plate 9 of the lid 92
2a has a rectangular window 92b corresponding to the funnel-shaped portion 42.
(FIG. 2) is provided. As shown in FIG. 5, an inclined edge 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 has a funnel-shaped part 42.
The outer wall surface of the cover abuts on the inclined edge portion 92c so that the lower wall is mounted in the lid 92 with the lower surface exposed to the outside.

The housing body 41 of the sensor housing 4 includes
Substrate mounting recess 4 for mounting substrate 5 described later on the upper surface
3, a glass substrate mounting chamber 44 for mounting a glass substrate 6 described later, which penetrates the sensor housing 4 in the vertical direction, is provided. The upper portion of the glass substrate mounting chamber 44 is divided into two front and rear portions by a partition plate 45, and an identification LED 5 used for identifying authenticity of the banknote M is provided at a front position (left side in FIG. 5).
An LED mounting chamber 46 for mounting the light receiving member 4 is formed, and a light receiving member mounting chamber 47 for mounting a light receiving member 51 described later is formed at a rear position.

Further, the funnel-shaped portion 42 is provided with a lead plate mounting recess 48 for mounting the lead plate 35 adjacent to the rear side of the glass substrate mounting chamber 44.
The bent piece 35b side is fitted into the lead plate mounting recess 48 and fixed by screws or the like. When the lead plate 35 is attached to the sensor housing 4, the bent piece 35 b is dimensioned such that the lower end thereof faces the top plate 950 (FIG. 2) of the casing body 91.

The substrate 5 is used for subjecting the output of the light receiving member 51 attached to the back surface to a predetermined electrical process.
The light receiving member 51 is provided in a portion corresponding to the light receiving member mounting chamber 47, for performing wiring or the like for supplying power to the identification LED 54.
An LED which is a light emitting member at a portion corresponding to the ED mounting chamber 46
(Light Emitting Diode) 54 is attached.

The light receiving member 51 comprises a light receiving element 52 for receiving the light from the lighting spot P, and a plate-like element holder 53 for supporting the light receiving element 52. The light receiving member 51 is mounted on the substrate 5 by fixing the element holder 53 to the back surface of the substrate 5 via a predetermined connecting member.

The light receiving element 52 includes a first light receiving element 52a.
And the second light receiving element 52b are formed adjacent to each other. The first light receiving element 52a is an EL (electrolumi) having a characteristic of emitting light in an AC electromagnetic field.
essence) to detect so-called EL light from the material. To detect such EL light, the first
On the surface of the light receiving element 52a, a band-pass filter 57 that transmits only EL light and cuts other light is laminated, and only the EL light enters the first light receiving element 52a due to the presence of the band-pass filter 57. It is possible to do.

On the other hand, the second light receiving element 52b is
This is for detecting the reflected light of the visible light from the emitted identification LED 54 on the surface of the banknote M. In the present embodiment, the wavelength of the light emitted from the identification LED 54 is different from the wavelength of the EL light.

The glass substrate 6 is, as shown in FIG.
The first glass substrate 61 and the second glass substrate 62 having a trapezoidal shape are formed in a side view (when the glass substrate 6 is viewed in the −X direction). First glass substrate 6
1 has a first inclined surface 61a formed on the front surface and a second inclined surface 61b formed on the rear surface. LED light from the identification LED 54 that has entered the first glass substrate 61 is applied to the first inclined surface 61a, 61b.
The light is reflected by the bottom surface of the first glass substrate 61 and the second inclined surface 61b, and the angle is set so that the reflected light reaches the lighting spot P. The translucent film 61c is laminated on the second inclined surface 61b.

The second glass substrate 62 is inclined such that the front surface is in surface contact with the second inclined surface 61b of the first glass substrate 61, and the rear surface is a vertical surface. The glass substrate 6 is formed by laminating the front surface of the second glass substrate 62 on the second inclined surface 61b of the first glass substrate 61.

Then, the irradiation light of the identification LED 54 is directed to the first inclined surface 61a of the first glass substrate 61 and then reflected there, and then directed to the bottom surface of the first glass substrate 61, where the second reflected light is also reflected. It goes to the inclined surface 61b, where it is reflected by the translucent film 61c and goes downward, it is irregularly reflected at the lighting spot P on the surface of the banknote M, and the upward vertical component of this irregular reflection is the first glass substrate 61, the semitransparent film 61c Further, the light passes through the second glass substrate 62 and enters the light receiving element 52.

The glass substrate 6 has an indium-tin-oxide (ITO) which is an oxide of an alloy of indium and tin on the lower surface and the right vertical surface in contact with the banknote M.
An ITO film 66 having conductivity formed by e) being deposited is laminated. This conductive I
The TO film 66 has a role as the other electrode facing the roller member 3 as one electrode.

In the present embodiment, the AC power source 30, the roller member 3, the lead plate 35, the glass substrate 6, and the first light receiving element 52a detect the printing using the so-called EL ink containing the EL material. A first detection structure 71 (FIG. 3) is configured and the identification L
The ED 54, the glass substrate 6, and the second light receiving element 52b constitute a second detection structure 72 for detecting a print superimposed on the EL ink and printed with normal ink.

The authenticity identification mechanism of the present invention compares the detection signals detected by the first and second detection mechanisms 71 and 72 with time, and examines the correlation between the two to identify the authenticity of the bill M. It is configured to be.

Before describing the authenticity identification mechanism, the printing of the bill M to be identified will be described. FIG. 6 is a perspective view illustrating an example of a printing state of the banknote M. FIG.
Is an enlarged cross-sectional view taken along the line C-C, (a) shows a state in which ordinary non-light-emitting ink is laminated and printed on EL ink, and (b) shows a state in which ordinary non-light-emitting ink is used. The state printed with the mixed ink obtained by mixing the EL inks is shown.

A large number of various characters, figures and symbols are printed on the surface of the banknote M. In the example shown in FIG. 6, the letter "S" is printed on the surface of the banknote M and four dots are printed so as to surround the letter "S" on the surface of the banknote M for simplicity. The bill M is inserted into the bill passage slit 95 (FIG. 1) of the paper sheet discriminating apparatus 1, and is drawn into the inner part of the bill passage slit 95 by the driving rotation of the transport roller 95c (FIG. 2). With the relative movement of the member 51 with respect to the bill M, the portion of the bill M indicated by a dashed line in FIG. 6 is sequentially scanned.

More specifically, the reflected light of the light from the identification LED 54 applied to the lighting spot P (FIG. 5) of the bill M is received by the second light receiving element 52b with time, and the bill passing slit 95 The emission of the EL ink at the daylighting spot P due to the inside being an AC electromagnetic field environment is received over time by the first light receiving element 52a. Then, the results of light reception by the first and second light receiving elements 52 and 53 are compared by the control device 8, and the authenticity of the bill M is identified.

As shown in FIG. 7, the bill M is made up of a paper M1 and a coating layer M2 laminated on the surface of the paper M1 by being coated with a predetermined coating material to smooth the printing surface. The surface of the coating layer M2 is formed by a print bump M3 formed by performing a printing process.

The print bump M3 is formed as shown in FIG.
In the case of the example shown in (1), it is composed of an EL ink portion M31 printed with EL ink, and a normal ink portion M32 formed by laminating a normal printing ink thereon. Normally, the ink of the ink portion M32 has a wavelength that transmits the EL light and is different from the wavelength of the EL light.

On the other hand, the printing bulge M3 of the example shown in FIG. 7B includes fine particles of EL material (EL fine particles M31) in an ink fabric M32 'made of the same printing ink as the normal ink portion M32. ') Is formed of ink mixed therein. Then, any of the print bumps M3
Also, there is no difference in identifying the authenticity of the bill M by scanning with the light receiving member 51.

When the banknote M having such a printed ridge M3 is inserted into the banknote passing slit 95 of the paper sheet discriminating apparatus 1, a sensor (not shown) detects the banknote M. The conveyance roller 95c is driven and rotated by the power supply, the bill M is drawn into the back of the bill passage slit 95, and the identification LED 54 emits light.
In this state, the bill M enters between the insulating ring 33 of the roller member 3 and the glass substrate 6 (FIG. 5), passes through the bill passing slit 95 while slidingly contacting them, and the light receiving member 51
Will be scanned.

Then, in this scanning, when the printing raised portion M3 (FIGS. 6 and 7) of the bill M reaches the lighting spot P (FIG. 5) in the bill passing slit 95, the second light receiving element 52
b receives reflected light from the EL ink portion M31 (FIG. 7A) or the EL fine particles M31 '(FIG. 7B),
As a result, electric power from the AC power supply 30 is supplied to the roller member 3 and the ITO film 66, so that the lighting spot P becomes an AC electromagnetic field environment, and the EL ink portion M31 of the print protrusion M3.
Emits light, and a component of the EL light directed upward of the glass substrate 6 crosses the glass substrate 6 upward and is received by the first light receiving element 52a, and the light emitted by the identification LED 54 is received by the second light receiving element 52b. Is done.

FIG. 8 shows the first and second light receiving elements 52a,
It is a graph which shows the spectral sensitivity characteristic of 52b. In this graph, the wavelength λ is set on the horizontal axis, and the sensitivity S is set on the vertical axis. As can be seen from this graph, EL
The sensitivity S of the first light receiving element 52a that receives light is different from that of receiving light in a predetermined wavelength range where the wavelength λ is short,
The sensitivity S of the light receiving element 52b is such that light in a predetermined wavelength range at a wavelength λ longer than the light receiving wavelength range of the first light receiving element 52a is received, and both receive light from different wavelength ranges. This can be realized by disposing a wavelength-selective optical filter (bandpass filter) in front of the light receiving surfaces of the two light receiving elements.

Therefore, the fluorescence and the EL light can be distinguished from the outputs of the first light receiving element 52a and the second light receiving element 52b.

FIG. 9 is a block diagram showing an embodiment of the light receiving control by the control device 8. As shown in FIG. As shown in this figure,
The authenticity identification control of the banknote M is performed by a CPU (Centra) inside.
The processing is performed by the control device 8 having an IProcessing Unit (80). The CPU 80 has a RAM (Ra
ndom Access Memory) 81 and R
An OM (Read Only Memory) 82 is connected.

The CPU 80 has a function as a central processing unit for controlling the entire system and performing arithmetic processing on the output from the light receiving element 52.

The RAM 81 is an external storage device capable of freely reading and writing data. The RAM 81 receives output values over time from the first and second light receiving elements 52a and 52b, predetermined arithmetic processing results, and the like. In addition, various values of intermediate processing and calculation results are output as necessary. Also,
The ROM 82 is a read-only external storage device, in which a program (correlation calculating means) for performing the authenticity identification processing is stored in advance. When power is supplied to the paper sheet identification apparatus 1 by operating the power switch 96, the program in the ROM 82 is read into the CPU 80. And CP
Each time the bill M is inserted into the bill passage slit 95, the U80 outputs a drive signal to various devices in accordance with the above program (sequence control), or outputs a drive signal to the detection signals from the first and second light receiving elements 52 and 53. An authenticity identification operation based on the authentication is performed.

One of the output ports of the CPU 80 has a first
An inverter 801 is connected, and a second inverter 802 is connected to another output port. The first inverter 801 turns on / off the transistor 803 connected to its output terminal in accordance with a signal output from the CPU 80, and controls turning on and off of the detection LED 55. Also, the second inverter 8
02 turns on / off the transistor 804 in the same manner as described above, thereby controlling lighting and extinguishing of the identification LED 54.

The detection light-receiving element 56 normally receives the LED light when the detection LED 55 is turned on. However, the detection path is cut off by the insertion of the bill M into the bill passage slit 95 so that the detection is performed. The light reception of the light receiving element 56 is interrupted, so that the bill M is
Is determined.

An operational amplifier 805 and a comparator 806 are connected in series between the light receiving element 56 for detection and the CPU 80. The operational amplifier 805 amplifies the output of the detection LED 55 received by the detection light receiving element 56, and the comparator 806 outputs a detection signal to the CPU 80 when the output value of the operational amplifier 805 exceeds a predetermined level. Things. With this configuration, disturbance is cut.

The first light receiving element 52a for receiving the EL light through the band pass filter 57 and the CPU 80
And an operational amplifier 807 as an amplifier, and a low-pass filter 80 including a predetermined resistor and capacitor.
8, predetermined resistance, capacitor and operational amplifier 809
And a band rejection filter 810 of FIG. The band rejection filter 810 is used to cut off electrical noise from an inverter 821 to be described later, which is mixed in the output from the first light receiving element 52a.

Further, the first light receiving element 52a and the CPU 80
And an amplifying circuit 812 including a predetermined resistor and an operational amplifier 811 for performing an amplification process on an output from the band rejection filter 810, and a peak hold circuit including a predetermined resistor, a capacitor, and the operational amplifiers 813 and 814. 815 are provided. The peak hold circuit 815 outputs a leading value of a predetermined time section of a signal output from the first light receiving element 52a.

The output value as an analog signal from the peak hold circuit 815 is converted into a digital signal by the A / D converter 816 and input to the CPU 80.

Further, between the CPU 80 and the second light receiving element 52b for receiving the LED light from the identification LED 54,
An operational amplifier 817 for amplification, a low-pass filter 818 formed by combining a predetermined resistor and a capacitor, an amplifier circuit 819 including a predetermined resistor and an operational amplifier 819, and an A / D converter 820 are provided. .

An inverter 821 and a switch circuit 822 for applying a constant alternating voltage to the roller member 3 and the lead plate 35 and the AC power supply 30 (FIG. 5) are provided between the roller member 3 and the lead plate 35 (FIG. 5). 5 is the inverter 821
And the switch circuit 822 are omitted), C
The on / off operation of the switch circuit 822 by the control signal from the PU 80 causes the formation and disappearance of the AC electromagnetic field between the roller member 3 and the lead plate 35.

The output port of the CPU 80 is connected to a motor control circuit 823 for controlling the drive of a motor (not shown) used for mechanical drive in the paper sheet identification apparatus 1. Then, for example, a motor is driven via a motor control circuit 823 by a drive signal from the CPU 80 based on a detection signal from the light receiving element 56 for detection, and the bill M is drawn into the bill passage slit 95 by the rotation of the transport roller 95c. And other mechanical functions.

When an output signal from the photoreflector 36 is input to the CPU 80, the roller member 3
, And the transport speed of the bill M in the bill passage slit 95 is detected. Also,
The CPU 80 outputs a signal indicating the authenticity identification result of the bill M to the indicator lamp 98.

The CPU 80 is provided with an alternating voltage control means 80a and an authenticity judgment means 80b. The alternating voltage control unit 80a determines that the portion of the bill M that emits EL light has reached the lighting spot P by receiving the detection signal from the first light receiving element 52a, and the EL ink portion M31 of the print bump M3. A switch-on control signal is output to the switch circuit 822 to emit light, and the detection signal from the first light receiving element 52a is interrupted. The switch 822 is configured to output a switch-off control signal.

Therefore, under the control of the alternating voltage control means 80a, the banknote M is kept in an alternating current state until the EL ink portion M31 reaches the lighting spot P and after the EL ink portion M31 has passed the lighting spot P. Since the banknote M is not exposed to the electromagnetic field environment, the bill M is prevented from being deteriorated due to being exposed to the AC electromagnetic field environment for a long time. At the same time, a high voltage is applied between the electrodes for an unnecessarily long time, thereby preventing the insulating member covering the electrodes from being quickly deteriorated.

The authenticity discriminating means 80b performs predetermined arithmetic processing on the output values from the first light receiving element 52a and the second light receiving element 52b, and judges the authenticity of the bill M. In the ROM 82, each light receiving element 52
a, and a correlation calculating means for calculating a correlation between the two by comparing the output values from the two, and the correlation calculating means is called by the CPU 80 at the time of half-authentication, and the authenticity stored beforehand is stored. A comparison calculation between the light receiving pattern of the bill M and the above output values is executed, and it is confirmed that the difference between the two is smaller than a predetermined level, so that the bill M to be identified is determined to be genuine. It is configured as follows.

FIG. 10 is a flowchart showing a flow of the reading control of the bill M. When the reading operation of the bill M is started (S1), first, the power switch 96 is turned on (S2), whereby the CPU 80 calls a program stored in the ROM 82, and the program is started, and the counter of each place is started. , Registers, flags, etc. are cleared, so-called initialization is executed (S
3).

Next, whether or not the bill M has been inserted into the bill passage slit 95 is determined by a detection signal from the light receiving element 56 for detection.
(YES in S4), the light from the LED 55 is blocked by the bill M and the output of the light receiving element 56 for detection is reduced. This reduction is input to the CPU 80 via the operational amplifier 805 and the low-pass filter 808. At the same time, a control signal is output from the CPU 80 to a transport motor (not shown) through the motor control circuit 823, and the transport of the transport motor (S5) causes the bill M to be passed through the bill passage slit 95.
Will be drawn in.

Subsequently, the identification LED 54 is turned on by the control signal from the CPU 80 (S6), and the identification LED 54 is turned on.
The LED light from the ED 54 is applied to a portion of the bill M being transported, which is located at the lighting spot P, whereby the light reflected from that portion is applied to the light receiving element 52, and the first and second light receiving elements 52a , 52b are fetched (S7). Note that the output value from the first light receiving element 52a is "0" until the EL light from the EL ink unit M31 is received by the first light receiving element 52a.

Next, in step S8, the amount of light received by the first light receiving element 52a is compared with a predetermined value stored in the ROM 82 in advance. If the received light amount is not less than the predetermined value (YES in step S8), step S9 is executed. While being executed,
If not, the process skips to step S18.
Subsequently, the process returns to step S6, and is repeated until the amount of light received by the first light receiving element 52a becomes equal to or more than a certain value.

When the amount of light received by the first light receiving element 52a is equal to or more than the above-mentioned fixed value, that is, when it is recognized that there is a fluorescent spot in the lighting spot P, the identification LED 54 is turned off ( S9) Continue C
The inverter 821 is driven by the switch-on operation of the switch circuit 822 based on the control signal from the PU 80, and thereby the lighting spot P becomes an AC electromagnetic field environment. As a result, the EL ink section M31 emits light. This luminescence is
The data received by the first light receiving element 52a is CP
It is taken into U80 (S11).

Next, step S12 is executed, and it is determined whether or not the received light amount of the first light receiving element 52a just taken in is larger than a predetermined value (S12). In the case of (YES), the received light is determined to be the EL light, and steps S13 and subsequent steps are executed.
Skipped to 8.

In step S13, which is executed when the result of step S12 is YES, the amount of light received by the second light receiving element 52b is taken into the CPU 80, and the second light receiving element 5b
It is asked whether the light receiving amount of 2b is equal to or more than a predetermined value (S14).

If the amount of light received by the second light receiving element 52b is equal to or more than the predetermined value (YES in S14), it is determined that fluorescence (light emission distribution on the right side in the graph of FIG. 8) is emitted from the surface of the bill M. The fluorescent flag is set (S1
5) On the other hand, if the amount of light received by the second light receiving element 52b is less than the predetermined value (NO in S14), it is determined that only the EL light is emitted from the surface of the bill M, and the EL flag is set ( S16) Then, after the inverter 821 is turned off, it is asked whether or not the conveyance of the bill M in the bill passage slit 95 is completed (S18).

If the transfer of the bill M has not been completed (NO in S18), the process returns to step S6, and if the transfer has been completed, the identification LED 54 is turned off (S19).
Thereafter, the transport motor is stopped by a signal from the motor control circuit 823 (S20), and the authenticity discriminating means 80 continues.
The authenticity of the bill M is determined by b, and the result is output to the indicator lamp 98 (S21), and a series of authenticity identification processing ends (S22).

According to the present invention, as described in detail above, the alternating voltage is applied to the banknote M only when the EL ink section M31 is located at the lighting spot P. The time during which the banknote M is exposed to the high-voltage AC electromagnetic field is shorter than when the banknote M is transported in a state set in a high-voltage AC electromagnetic field environment. It is possible to avoid the inconvenience that the bill M is quickly deteriorated by minimizing the authenticity and performing the authenticity identification operation.

FIG. 11 is an explanatory view in sectional view showing a second embodiment of the sensor device. The sensor device of this embodiment detects a security pattern printed by a special printing technique by mixing a metal glossy ink based on a metal powder with an EL ink to display images and colors that differ depending on the angle. The sensor housing 4 includes two sheets (a first glass substrate 61 and a second glass substrate 6).
An integrated glass prism 60 is employed in place of the glass substrate 6 on which 2) is laminated.

The glass prism 60 has a trapezoidal shape that is bilaterally symmetric when viewed from the front, and extends from a right inclined surface 60a orthogonal to the optical axis of the LED 54 and the left edge of the right inclined surface 60a in FIG. Top surface 60 extending in the horizontal direction
b, the right inclined surface 60a extending from the left edge of the top surface 60b, and the target left inclined surface 60c. The three-dimensional shape of the glass prism 60 is set such that the lighting spot P for the bill M is located at the intersection of the center line extending in the vertical direction and the optical axis of the LED 54. Other configurations of the paper sheet identification apparatus 1 are the same as those of the previous embodiment.

If such a glass prism 60 is adopted,
If the print pattern is formed so that the wavelength changes depending on the reflection direction, the light receiving elements 52a and 52b are made to correspond to the light receiving sensitivity characteristics, and the presence of the print bump M3 (security pattern) is determined. Detection can be performed more effectively.

In this embodiment, the identification L
The reflected light from the ED 54 is transmitted to two light receiving elements 52a and 52b.
The presence / absence of a security pattern is detected based on the output signal from the CPU, and when the security pattern is detected, instead of stopping the emission of the identification LED 54, the lighting spot P is set to an AC electromagnetic field environment to detect the presence / absence of EL emission. This avoids the disadvantage that the banknote M is always exposed to the AC electromagnetic field environment.

In this embodiment, an example has been described in which the print pattern is formed so that the wavelength changes depending on the reflection direction. However, the reflection characteristic has a unique characteristic or the reflection pattern differs depending on the angle. It may be.

[0082]

According to the first aspect of the present invention, the alternating voltage is applied to the sheet only when the fluorescent ink is located at the lighting spot, so that the high-voltage AC electromagnetic field environment is set from the beginning. The exposure time of the paper sheet to the high-voltage AC electromagnetic field is shorter than when the paper sheet is conveyed to the daylighting spot, thereby minimizing the effect of the longer exposure time on the paper sheet. Thus, it is possible to avoid the inconvenience that the paper sheets are quickly deteriorated by performing the authenticity identification operation.

According to the second aspect of the present invention, the authenticity is determined based on the output values of both the reflected light of the light received from the light irradiating means and the light emission of the fluorescent ink received by the light receiving means. As a result, the emission of the fluorescent ink on the paper sheet located at the lighting spot is received by the light receiving means and input to the authenticity determining means, and the reflected light from the light source at the lighting spot is also authenticated by the authenticity determining means via the light receiving means. The sheet is authenticated by the authenticity discriminating means on the basis of both output values, thereby improving the accuracy of authenticity identification.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a paper sheet identification device according to the present invention, showing a state in which a casing lid is closed.

FIG. 2 is a perspective view showing an embodiment of the paper sheet identification device according to the present invention, and shows a state in which a casing lid is opened.

FIG. 3 is an exploded perspective view showing one embodiment of a device main body provided in a casing.

FIG. 4 is an assembled perspective view of the apparatus main body shown in FIG. 3;

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a perspective view showing an example of a printed state of a bill.

FIG. 7 is an enlarged cross-sectional view taken along line CC of FIG. 6;
The state in which ordinary non-luminous ink is printed on the EL ink in a laminated state, and the state shown in (b) is the state in which normal non-luminous ink is printed with the mixed ink obtained by mixing the EL ink with the ordinary non-luminous ink. Is shown.

FIG. 8 is a graph showing spectral sensitivity characteristics of the first and second light receiving elements.

FIG. 9 is a block diagram illustrating an embodiment of light reception control by a control device.

FIG. 10 is a flowchart showing a flow of banknote reading control.

FIG. 11 is a sectional view illustrating a sensor device according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper-sheet identification apparatus 2 The said apparatus main body 3 Roller member 30 AC power supply 31 Center axis 32 Metal disk 33 Insulation ring 35 Lead board 35a Lead board main body 35b Folding piece 36 Photoreflector 4 Sensor housing 41 Housing main body 42 Funnel shape Part 43 Substrate mounting recess 44 Glass substrate mounting chamber 45 Partition plate 46 Mounting chamber 47 Light receiving member mounting chamber 48 Lead plate mounting recess 5 Board 51 Light receiving member 52 Light receiving element 52a First light receiving element 52b Second light receiving element 53 Element holder 56 For detecting Light receiving element 56 Above detection light receiving element 57 Band pass filter 6 Glass substrate 60 Glass prism 60a Right inclined surface 60b Top surface 60c Left inclined surface 61 First glass substrate 61a First inclined surface 61b Second inclined surface 61c Semi-transparent film 62 Second glass Substrate 66 ITO 71 First detection structure 7 Second detection structure 8 Control device 80 CPU 80a Alternating voltage control means 80b Authentication determining means 81 RAM 82 ROM 801 First inverter 802 Second inverter 803, 804 Transistors 805, 817, 807, 811 Operational amplifier 806 Comparator 808, 818 Low-pass filter 810 Band rejection filter 812 Amplification circuit 815 Peak hold circuit 816 Converter 819 Amplification circuit 820 Converter 822 Switch circuit 823 Motor control circuit 9 Casing 91 Casing body 91a Roller insertion window 92 Lid 92a Bottom plate 92b Rectangular window 92c Inclined edge 93 Bracket 94 Horizontal axis 95 Bill passing slit 95a Guide ridge 95b Elongated groove 95c Transport roller 95d Auxiliary roller 96 Power switch 98 Display 98a Ready lamp 98b Pass lamp 98c Reject lamp 950 Top plate 54 Identification LED 55 Detection LED M Banknote M1 Paper M2 Coating layer M3 Print ridge M31 Ink M31 Fine M32 Ink fabric M32 Above normal ink M32 Normal ink P Lighting spot

Claims (2)

[Claims] 1. A paper for identifying the authenticity of a paper sheet printed with fluorescent ink that emits light when placed in an AC electromagnetic field environment and emits fluorescence when irradiated with light of a predetermined wavelength. A leaf discriminating apparatus, comprising: an alternating voltage applying means for applying an alternating voltage to a predetermined counter electrode to form the AC electromagnetic field environment; and lighting of paper sheets being conveyed in the AC electromagnetic field environment. Light receiving means for receiving light from the spot, light irradiating means for irradiating light of a predetermined wavelength toward the lighting spot, and light received by the light receiving means from the fluorescent ink and other things Optical separation means for separating into, the alternating voltage control means for controlling the driving of the alternating voltage application means, and authenticity determination means for determining the authenticity of the paper sheet based on the output value of the light receiving means, provided. Above exchange The sheet identification device, wherein the number voltage control means is configured to drive the alternating voltage application means only when it is determined that the light receiving means receives light from the fluorescent ink. 2. The authentication device according to claim 1, wherein the authenticity discriminating unit judges authenticity based on output values of reflected light of the light from the light irradiating unit, received by the light receiving unit, at a lighting spot and emission of the fluorescent ink. The paper sheet identification device according to claim 1, wherein the paper sheet identification device is configured.