JP2000090318A - Paper sheets and its discrimination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely discriminate the authenticity of valuable paper sheets. SOLUTION: A betting ticket 7 provided for discriminating the authenticity by receiving the reflected light of irradiated light and reading entry items is composed of base paper 71, an invisible light beam absorbing ink layer 72 formed by performing tint block printing by using invisible light beam absorbing ink provided with the characteristics of absorbing invisible light beams on at least one surface of the base paper 71 and a colored ink layer 73 printed by using colored ink on the base paper 71 where the ink layer is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to paper sheets applied to valuables such as coupons and voting tickets, and more particularly to a paper sheet processed so as to be easily distinguished from a real one and a method for discriminating the same. is there.

[0002]

2. Description of the Related Art Hitherto, valuable paper sheets such as gift certificates, coupon tickets, and voting tickets used for voting of expected winners in horse races and bicycle races have been known. Usually, such valuable papers are subjected to printing processing in which characters, figures, symbols, patterns, and the like are designed in a complicated manner. The pattern or the like is generally printed using a so-called colored ink that allows a person to visually recognize the color by reflecting or absorbing visible light.

[0003] The authenticity of such valuable papers is determined by irradiating the printing surface thereof with invisible light such as visible light and infrared light and analyzing the reflected light. Specifically, a predetermined reading device reads a pattern of paper sheets and the like,
The reflected light of a real pattern or the like stored in advance is compared with the reflected light of the object to be determined, and the authenticity is determined based on the degree of coincidence between them. The invisible light is applied to the printing surface because the reflected light may be conspicuous depending on the type of the color ink, and this is expected to improve the accuracy of authenticity determination of valuable paper sheets.

[0004]

In the above-mentioned conventional valuable papers, when the papers obtained by copying the real papers with a copying machine are input to a reading device, only the visible light is emitted. Not only is it impossible to determine authenticity by projecting light onto the printing surface, but even if the printing surface is irradiated with invisible light, the reader may determine that the paper is genuine even though it is not genuine paper. There was a problem that there is.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a paper sheet capable of reliably determining the authenticity of valuable paper sheets and a method for determining the paper sheet. The purpose is.

[0006]

According to a first aspect of the present invention, there is provided a paper sheet which is used for judging authenticity by receiving reflected light of irradiated light and reading the written matter. And a base paper, an invisible light absorbing ink layer formed by performing a tint block printing using an invisible light absorbing ink having a property of absorbing invisible light on at least one surface of the base paper, and the ink layer And a colored ink layer printed using colored ink on the base paper on which is formed.

According to the paper sheet, since the invisible light absorbing ink layer and the colored ink layer are formed on at least one side of the base paper by printing, first, the paper sheet is printed on the printing surface of the paper sheet. By irradiating the visible light, the authenticity of the paper sheet can be determined based on the reflected light reflected by the colored ink layer. In addition, by irradiating the same non-visible light, the light is absorbed by the non-visible light absorbing ink layer and the reflected light cannot be obtained in the case of the real one, whereas the non-visible light absorbing ink layer is present in the case of the non-real one. If the light is not reflected, it is possible to determine the authenticity of the paper sheet by reflecting the light.

As described above, by forming in advance two types of printing layers, an invisible light-absorbing ink layer and a colored ink layer, on a base paper, a so-called double check for double-checking the authenticity is realized. Further, it is possible to more reliably and accurately determine the authenticity by irradiating invisible light rays as compared with a conventional paper sheet having only a colored ink layer formed thereon.

A paper sheet according to a second aspect of the present invention is the paper sheet according to the first aspect, wherein the colored ink is blue.

According to the paper sheet, the blue colored ink reflects when irradiated with near-infrared light, which is an invisible light, but absorbs yellow-green light, which is a visible light. Thus, the accuracy of authenticity determination can be improved.

According to a third aspect of the present invention, there is provided a paper sheet discriminating method, wherein the paper sheet is sent to a predetermined transport path, and light is emitted from a light emitting element on one side of the paper sheet moving on this transport path. Irradiating both visible light and invisible light, the reflected light of these visible light and invisible light is respectively received by a light receiving element, and the paper is obtained by analyzing the received light. It is characterized in that it is determined whether or not there is.

According to this paper sheet discriminating method, the paper sheet sent into the transport path is irradiated with visible light and invisible light from the light emitting element on one side, and each reflected light is received by the light receiving element. The light is received and subjected to predetermined analysis processing. If the paper sheet is as described in claim 1, it is determined that the paper sheet is genuine.

As described above, since the paper sheet is conveyed by being supplied to the conveyance path and is irradiated with visible light and invisible light to be authenticated, the authenticity judgment processing is quickly performed. .

According to a fourth aspect of the present invention, there is provided a method of determining a sheet according to the third aspect, wherein near infrared rays are used as the invisible light.

According to this paper sheet discrimination method, the near infrared ray has a wavelength of about 880 nm and has a high absorption rate for ink that absorbs invisible light. It is suitable for authenticity discrimination to determine authenticity.

According to a fifth aspect of the present invention, there is provided a method for determining a sheet according to the third or fourth aspect, wherein a yellow-green light is used as the visible light. It is.

According to a sixth aspect of the present invention, there is provided a method for determining a sheet according to any one of the third to fifth aspects, wherein a photodiode is used as the light receiving element. Is what you do.

According to this method of discriminating paper sheets, the photodiode is a photosensitive electromotive element using cadmium, gallium, germanium, etc., and has a small size and excellent electromotive performance. It is suitable as a material for receiving reflected light of a light beam applied to the object and converting it into an electric signal.

According to a seventh aspect of the present invention, there is provided a paper sheet discriminating method according to any one of the third to sixth aspects, wherein the light emitting element and the light receiving element have the same support. It is characterized by being arranged on the body.

According to this paper sheet discriminating method, the light-emitting element and the light-receiving element are supported by the same support.
A compact reading mechanism for reading reflected light from paper sheets is realized.

According to an eighth aspect of the present invention, there is provided a paper sheet discriminating method according to any one of the third to seventh aspects, wherein a plurality of the light emitting elements and the plurality of light receiving elements are provided. It is characterized in that it is used as a component of an image sensor that reads the paper sheet as an image.

According to this method of discriminating paper sheets, the reflected light from the paper sheets can be captured as surface information by the image sensor, and the accuracy of the authenticity judgment of the paper sheets is improved.

[0023]

FIG. 1 is a perspective view showing an embodiment of paper sheets according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. 1 and 2 exemplify voting tickets of a bicycle race as paper sheets. As shown in these figures, a voting ticket 7 is composed of a base paper 71 made of strong paper such as kraft paper and having a length and width of approximately 5 cm × 9 cm, and an invisible light beam formed by printing on one side of the base paper 71. It is formed with an absorbing ink layer 72 and a colored ink layer 73.

The invisible light absorbing ink layer 72 is formed by printing a tint block on one side of the base paper 71 using an invisible light absorbing ink having a characteristic of absorbing invisible light. In the present embodiment, a plurality of non-visible light absorbing ink layers 72 are provided as a border of the base paper 71 and in series in the vertical direction substantially at the center in the horizontal direction.

The invisible light absorbing ink for forming the invisible light absorbing ink layer 72 has a wavelength of about 8
One that absorbs near-infrared light of 80 nm is employed.
Therefore, when the near-infrared ray is applied to the betting ticket 7, most of the near-infrared ray is absorbed by the invisible light absorbing ink layer 72, and the light is not reflected there. In the present invention, the tint block of the betting ticket 7 is formed by the invisible light absorbing ink layer 72.

The colored ink layer 73 is formed by printing with colored ink. Such a colored ink layer 7
Reference numeral 3 includes a first colored ink layer 73a used to determine the authenticity of the betting ticket 7, and a second colored ink layer 73b on which voting numbers and voting amounts are printed. In the present embodiment, the first colored ink layer 73a is formed of blue ink, and the second colored ink layer 73b is formed of black ink. Therefore, betting ticket 7
By irradiating the printed surface with visible light, the first colored ink layer 73a emits blue light because visible light having a wavelength other than blue is absorbed and only visible light having the blue wavelength is reflected. The two-color ink layer 73b becomes black because all visible light is absorbed. Note that the second colored ink layer 73b becomes black when irradiated with near-infrared rays, so that the description content of the second colored ink layer 73b is recognized.

In the present invention, the voting ticket 7 is sent to a predetermined transport path, and both the visible light and the invisible light emitted from the light emitting element are applied to one side of the voting ticket 7 moving on the transport path. The voting ticket 7 is illuminated, and the reflected light of the visible light and the invisible light is received by a light receiving element and analyzed to determine the authenticity of the betting ticket 7.

FIGS. 3 and 4 are partially cutaway perspective views showing an embodiment of a paper sheet reading apparatus applied to the practice of the method of the present invention. FIG. 3 shows that the second frame is a first frame. FIG. 4 shows a state where the second frame is overlaid on the body, and FIG. 4 shows a state where the second frame is separated from the first frame. FIG. 5 is a cross-sectional view of FIG.
It is a line sectional view. FIG. 6 is a partially enlarged view showing a main part of FIG. 3 and 4, the XX direction is referred to as the width direction, the YY direction is referred to as the front-rear direction, and particularly the -X direction is leftward, the + X direction is rightward, the -Y direction is forward or downstream direction, The + Y direction is referred to as a backward or upstream direction.

As shown in these figures, a paper sheet reading apparatus 1 comprises a box-shaped lower frame (first frame) 2 and a box which is connected to the lower frame 2 at the upper part thereof so as to be detachable from and connected to the lower frame 2. The upper frame (second frame) 3 of the mold, the transporting means 4 for transporting the voting ticket 7 sandwiched between the lower frame 2 and the upper frame 3, and the voting ticket 7 being transported by the transporting means 4. The image sensor 5 has a basic configuration including an image sensor 5 that projects light on a document surface and receives the reflected light through a transparent plate facing the document surface to read the document.

The lower frame 2 has a bottom plate 21 which has a rectangular shape in plan view and is long in the front-rear direction, and a width direction extending upward from a side edge of the bottom plate 21 extending in the front-rear direction. A pair of side plates 22, a pair of front and rear plates 23, which are erected upward from side edges extending in the same width direction, and a top plate 24 supported by upper edges of these side plates 22 and the front and rear plates 23.
And the external shape is a rectangular parallelepiped. Top plate 2
4, a pair of brackets 25 in the width direction are erected at the front of
The upper frame 3 is supported by the lower frame 2 while being rotatably supported around the connecting shaft 26 between the pair of brackets 25.
It is connected to.

A receiving stand 27 is provided on the top plate 24 of the lower frame 2 so as to protrude rearward from a rear edge portion. 1 is introduced. A pair of widthwise edge dams 27a protrude from both side edges in the width direction of the receiving stand 27, and the betting ticket 7 is transmitted to the sheet reading apparatus 1 in a state where movement in the width direction is restricted by the pair of edge dams 27a. It is being introduced properly. Also, the top plate 24 of the lower frame 2 includes
A pair of rectangular elongated holes 24a in the front-rear direction extending in the width direction are formed.

The upper frame 3 is formed of a rectangular parallelepiped whose width is set slightly smaller than the gap between the brackets 25 and whose front and rear dimensions are the same as those of the lower frame 2. I have. The upper frame 3 has a bottom plate 31 facing the top plate 24 of the lower frame 2.
A pair of side plates 32 in the width direction projecting upward from both side edges of the bottom plate 31; and a pair of front and rear plates 33 in the front and rear direction bridged between the front edge and the rear edge of the side plates 32.
And a top plate 34 covering the upper opening.

The upper frame 3 is rotatably supported around the connecting shaft 26 by inserting the connecting shaft 26 into the front ends of the pair of side plates 32, whereby the bottom plate of the upper frame 3 is A horizontal posture 31 shown in FIG. 3 in which the upper surface 31 faces the top plate 24 of the lower frame 2
The posture can be changed between an upright posture and an upright posture in a state of standing upright.

The upper frame 3 has a pair of front and rear rectangular holes formed in the bottom plate 31 so as to face the rectangular long holes 24a of the pair of lower frames 2 in a horizontal posture. 31a. A guide inclined plate 35 having an inclined surface corresponding to the receiving table 27 is provided on the front and rear plates 23 behind the upper frame 3. It can be easily inserted between the frames 2 and 3.

Further, the upper frame 3 has a pair of hemispherical spacers 36 in the width direction projecting from the rear end of the bottom plate 31, and the upper frame 3 is set in a horizontal posture. When the pair of spacers 36 abut on the upper surface of the top plate 24 of the lower frame 2, a gap having a certain vertical dimension is formed between the top plate 24 of the lower frame 2 and the bottom plate 31 of the upper frame 3. I am trying to be.

The transport means 4 is a pair of lower rollers (transport rollers) which are housed in the lower frame 2 and whose upper portion only projects a predetermined length outward from the rectangular elongated hole 24a of the lower frame 2 to the outside. 41, and is installed in the upper frame body 3, and
A pair of upper rollers (auxiliary rollers) 42 in the front-rear direction, of which only the lower part protrudes outside from the rectangular slot 31a by a predetermined length,
A drive mechanism 43 for driving these rollers 41 and 42 to rotate is formed. Both the lower roller 41 and the upper roller 42 are formed of a flexible material such as rubber or soft synthetic resin. In the present embodiment, the pair of front and rear lower rollers 41 have the same diameter, but the diameter of the lower roller 41 on the downstream side is slightly larger than the diameter of the lower roller 41 on the upstream side. Dimensions are set, so that the upper and lower lower rollers 41
When the rotation speeds of the lower rollers 41 are the same, the peripheral speed of the lower roller 41 on the downstream side may be slightly higher than the peripheral speed of the lower roller 41 on the upstream side.

Each of the lower rollers 41 has a pair of lower horizontal shafts 41a in the front-rear direction bridged between the side plates 22 of the lower frame 2.
While being pivotally supported around each other,
Each of the upper rollers 42 is rotatably supported around a pair of upper horizontal shafts 42 a in the front-rear direction bridged between the side plates 32 of the upper frame 3. These horizontal shafts 41a,
42a is a state in which the upper frame 3 is set in a horizontal posture,
The set position is set so that the peripheral surface of the lower roller 41 and the peripheral surface of the upper roller 42 come into contact with each other.

The driving mechanism 43 includes a pair of driven pulleys 44 in the front-rear direction, which are rotatably supported coaxially and coaxially with the lower horizontal shafts 41a in the lower frame 2, and these driven pulleys 44.
An auxiliary pulley 45 provided therebetween, a driving pulley 46 provided outside the front of the lower frame 2,
3. An endless belt 47 bridged by a pair of driven pulleys 44 and an auxiliary pulley 45, and a drive motor 48 for rotating the drive pulley 46 around a drive shaft 48a. In the present embodiment, the pair of front and rear driven pulleys 44 have the same diameter.

The auxiliary pulley 45 is rotatably supported around an auxiliary shaft 45a bridged between the side plates 22 of the lower frame 2. The auxiliary pulley 45 is provided at a position where the forward belt stretched between the pair of driven pulleys 44 is pushed downward, whereby the contact area between the endless belt 47 and the driven pulley 44 is increased, so that the auxiliary pulley 45 is particularly positioned on the front side. The idle pulley 44 is prevented from idling.

According to the structure of the driving mechanism 43, FIG.
As shown in FIG. 5, by driving the drive motor 48, this rotation is transmitted to the pair of driven pulleys 44 via the drive shaft 48a, the drive pulley 46 and the endless belt 47, and the driven pulleys 44 Since the lower roller 41 integrated with the driven pulley 44 rotates in the same direction about the shaft 41a, it rotates in the same direction about the lower horizontal shaft 41a. And this rotation is performed when the peripheral surface is the lower roller 41.
Is transmitted to a pair of upper rollers 42 that are in contact with the peripheral surface of the upper roller 42, whereby each upper roller 42 rotates in the opposite direction to the lower roller 41.

Accordingly, by inserting the voting ticket 7 into the voting ticket slot 10 through the receiving stand 27 with the driving motor 48 being rotated in the counterclockwise direction, the voting ticket 7 is
Moving the transport path 11 formed between the lower frame 2 and the upper frame 3 toward the downstream side while being engaged between the upper and lower rollers 41 and 42 that are rotating in contact with the upper and lower sides. become.

As shown in FIG. 5, the image sensor 5 has two types of light sources 52 (a first light source 52a and a second light source 52b) in a box-shaped casing 51 having an opening on the lower surface.
, A lens member 53, and a light receiving unit 54. A glass plate (transparent plate) 55 is fitted into the lower opening of the casing 51, thereby sealing the inside of the casing 51. Note that the transparent plate is not limited to the glass plate 55, and may be any plate formed of a transparent material such as a transparent synthetic resin plate.

The first light source 52a is formed by a light-emitting element (LED) that emits yellow-green visible light (wavelength: about 570 nm), while the second light source 52a is formed.
b is formed by a light emitting element that irradiates near infrared rays (wavelength approximately 880 nm). The first light source 52a and the second light source 52b emit light alternately at predetermined time intervals in a state where the betting ticket 7 is inserted into the transport path 11.

The first light source 52a and the second light source 52
b indicates that the projection light is reflected on the surface of the betting ticket 7 arranged opposite to the glass plate 55 and the reflected light is reflected on the lens member 5.
3 is set so as to enter the light. Further, as the lens member 53, a so-called 1 × type so-called cell hoc lens formed by bundling a large number of optical fibers of the digging rate dispersion type is adopted. The light receiving unit 54
Is formed by adopting a photodiode as a light emitting element. Then, the reflected light from the first light source 52a and the second light source 52b passing through the lens member 53 is input to the light receiving unit 54 and converted into an electric signal, and the electric signal is analyzed by a control means (not shown) to vote. The authenticity of the ticket 7 is determined.

The image sensor 5 is held by the holding member 6 and is mounted in a square hole 37 formed in the center of the bottom plate 31 of the upper frame 3 so that the upper frame 3 is set in a horizontal posture. Voting ticket 7 with glass plate 55 moving on transport path 11
Are opposed to each other in a separated state.

As shown in FIG. 5, the holding member 6 has a bottom plate (cover) 61 whose length in the front-rear direction is slightly longer than that of the square hole 37, and is erected on the bottom plate 61. And a pair of support walls 62. At the center of the bottom plate 61, a light projecting hole 61a extending in the width direction (perpendicular to the plane of FIG. 5) formed to spread downward in the front-rear direction is formed. The voting ticket 7 on the transport path 11 passes through the voting ticket 7.

The distance between the support walls 62 in the front-rear direction is set slightly larger than the front-rear dimension of the image sensor 5 so that the image sensor 5 can be sandwiched and stored between the pair of support walls 62. Has become. Also,
Each support wall 62 has a locking claw 62a projecting in a direction facing each other at an upper end portion, and each locking claw 62a is attached to the image sensor 5 in a state where the image sensor 5 is held between the pair of support walls 62. The upper end of the image sensor 5 is locked so that the mounting state of the image sensor 5 to the holding member 6 is stabilized.

The bottom plate 61 has a flange portion 61b formed in a portion protruding forward and backward from each support wall 62, and each support wall 62 is formed from the lower surface of the upper frame 3 to the square hole 37. In the fitted state, as shown in FIG. 4, the holding member 6 with the image sensor 5 attached thereto is attached to the upper frame 3 by screwing the flange portion 61b to the bottom plate 31 of the upper frame 3. Has become.

In the present invention, as shown in FIG. 6, the image sensor 5 is arranged such that the glass plate 55 is separated from the document surface of the betting ticket 7 by a predetermined distance due to the presence of the bottom plate 61 of the holding member 6. Not only the installation position is set, but also the thickness of the bottom plate 61 is set so that the bottom plate 61 itself does not interfere with the betting ticket 7. Specifically, the thickness dimension d2 of the bottom plate 61 of the holding member 6 is
Is smaller than the protrusion amount d1 from the rectangular long hole 24a, whereby a gap d1-d2 (gap dimension d3) is formed between the lower surface of the bottom plate 61 and the upper surface of the betting ticket 7 located on the transport path 11. Is formed.

In the present invention, as shown in FIG. 5, there is provided a control means 8 comprising a microcomputer for performing the authenticity judgment processing of the betting ticket 7 introduced into the sheet reader 1. After the authenticity of the betting ticket 7 is determined by the control means 8, if the betting ticket 7 is genuine, a predetermined amount is refunded. Slot 10
Through to the outside.

More specifically, a voting ticket sensor 81 for detecting that the voting ticket 7 has been inserted into the paper-sheet insertion slot 10 is provided at the back of the receiving stand 27 of the lower frame 2. When the ticket sensor 81 detects the betting ticket 7, this detection signal is input to the control means 8. When this detection signal is inputted to the control means 8, a drive signal is outputted from the control means 8 to the drive motor 48, and the drive of the drive motor 48 causes the pair of lower rollers 41 to be driven via the endless belt 47. Rotates counterclockwise around the lower horizontal shaft 41a, so that the voting ticket 7 is first bitten between the lower roller 41 and the upper roller 42 on the upstream side, and is conveyed downstream.

The control means 8 has a built-in timer 82. The timer 82 is turned on at the same time that the betting ticket sensor 81 detects the betting ticket 7. Then, when a predetermined time elapses from when the timer 82 is turned on to when the downstream end of the betting ticket 7 reaches immediately below the lens member 53, the control unit 8 alternately controls the first light source 52a and the second light source 52b. A signal is output, whereby the first light source 52a and the second light source 52b emit light alternately.

Then, a part of the reflected light of the visible light and the invisible light outputted from each of the light sources 52a and 52b is reflected and enters the light receiving portion 54 through the lens member 53, where it is converted into an electric signal. Then, it is output to the control means 8. The control means 8 includes a real voting ticket 7 in advance.
Invisible light absorbing ink layer 72 and colored ink layer 73
And a comparison program are stored. The stored pattern and the pattern of the betting ticket 7 being read are compared one by one by the execution of the comparison program. On the other hand, if they are different, it is determined that they are not authentic. At this time, the second colored ink layer 73b is also read, and when the voting ticket 7 is a real ticket and a winning ticket, the payout is refunded.

When the time required to pass through the transport path 11 has elapsed since the betting ticket 7 was detected by the betting ticket sensor 81, the timer 82 is reset, and the control unit 8 stops moving toward the drive motor 48. A signal is output, and the rotation of the lower roller 41 stops when the driving of the driving motor 48 is stopped.

Hereinafter, a control flow of the control means 8 will be described. FIG. 7 is a flowchart showing one embodiment of the control flow by the control means 8. As shown in this flowchart, first, in step S1, whether or not the betting ticket 7 is inserted is detected by the betting ticket sensor 81. When the betting ticket is inserted, the drive motor 48 is driven by a drive signal from the control means 8. (Step S2).
The voting ticket 7 is introduced into the transport path 11 by the rotation of the lower roller 41 driven by the drive motor 48, and the printed surface thereof is moved to the first position.
By irradiating the visible light from the light source 52a and the invisible light from the second light source 52b, the reflected light is read by the light receiving unit 54 (step S3).

Next, the information on the printing surface read by the light receiving section 54 is converted into an electric signal and input to the control means 8, where the authenticity is discriminated (step S4). Is discharged from the downstream end, is sent into the payout apparatus, and the payout is paid out (step S5). On the other hand, if it is not genuine, the voting ticket 7 is reversely driven by the drive motor 48 so that the voting ticket 7 is It is discharged outside (step S6). Then, after a lapse of a predetermined time set in the timer 82, the drive motor 48 is stopped (step S7), and one batch of the betting ticket 7
And the payout refund process are completed.

Hereinafter, the base paper 7 of each ray when the real and non-real voting tickets are irradiated with visible light and invisible light
The state of reflection and absorption on one sheet, the invisible light absorbing ink layer 72 and the colored ink layer 73 will be described with reference to FIG. The thick downward arrow in the figure indicates that the light beam passes through the character portion or the copy-forgery-inhibited pattern portion, the thick broken arrow indicates that the light ray is reflected on the character portion or the copy-forgery-inhibited pattern portion, and a combination of the thick solid line and the thin arrow. Indicates that the light ray is absorbed by the character portion or the copy-forgery-inhibited pattern portion, respectively. “YG” indicates yellow-green visible light, and “IR” indicates near-infrared light that is invisible light. The paper surface of the voting ticket 7 to which light is irradiated is white. Since the color of the paper is white, the emitted light is reflected on the paper in any case.

First, when a real voting ticket 7 is irradiated with visible light YG, the visible light YG is reflected on a white paper surface,
The visible light YG is absorbed in the portion where the characters are printed (colored ink layer 73), and the visible light YG is reflected in the portion where the copy-forgery-inhibited pattern is printed (invisible light absorbing ink layer 72). Then, when the real voting ticket 7 is irradiated with the invisible light IR, the invisible light IR is reflected on the white paper surface, transmitted through the character portion and reflected on the paper surface, but is absorbed by the invisible light portion on the copy-forgery-inhibited pattern portion. Since the ink layer 72 is formed, the invisible light IR is absorbed here.

On the other hand, when the color-copied voting ticket 7 is irradiated with the visible light YG, the visible light YG is reflected on the paper surface, but the visible light YG is absorbed in the character portion and is reflected in the copy-forgery-inhibited pattern portion. Then, when the color-copied voting ticket 7 is irradiated with the invisible light IR, the light is reflected on the paper surface, transmitted on the character portion, and reflected on the copy-forgery-inhibited pattern portion. Invisible light IR in non-real voting ticket 7
Is reflected on the copy-forgery-inhibited pattern portion because the toner of the copy does not have the ability to absorb the invisible light IR.

Accordingly, the difference between the genuine betting ticket 7 and the color-copied voting ticket is that when the invisible light IR is irradiated, the real thing absorbs the invisible light IR in the copy-forgery-inhibited pattern portion.
Non-real voting tickets are at the point where they are reflected in the tint block. Therefore, the authenticity of the color copy can be detected by supplying the betting ticket to the sheet reader 1 based on the difference.

When a monochromatic copied voting ticket is irradiated with visible light YG, the visible light YG is reflected on the paper surface, and the character portion and the copy-forgery-inhibited pattern portion are black, so that the visible light YG is absorbed. Then, when the monochrome copied voting ticket is irradiated with invisible light IR, the invisible light IR
Is reflected on the paper surface, the character portion and the copy-forgery-inhibited pattern portion.

Therefore, the difference between the genuine betting ticket 7 and the monochrome copy is that when the invisible light IR is irradiated, the invisible light IR is reflected in the character portion and absorbed in the copy-forgery-inhibited pattern portion. Contrary to this, a non-genuine voting ticket is absorbed in a character portion and reflected in a copy-forgery-inhibited pattern portion.
Therefore, by supplying the betting ticket 7 to the sheet reader 1 based on this difference, a monochrome-copy betting ticket can be detected.

[0063]

According to the paper sheet of the present invention, the paper sheet has an invisible light absorbing ink layer and a colored ink layer formed on at least one side of the base paper by printing. By irradiating the printed surface with visible light, the authenticity of the paper sheet can be determined based on the reflected light reflected by the colored ink layer. In addition, by irradiating the same non-visible light, the light is absorbed by the non-visible light absorbing ink layer and the reflected light cannot be obtained in the case of the real one, whereas the non-visible light absorbing ink layer exists If the light is not reflected, the authenticity of the paper sheet can be determined by reflecting the light.

As described above, by forming in advance two types of printing layers of the invisible light-absorbing ink layer and the colored ink layer on the base paper, a so-called double check for double-checking the authenticity is realized. In addition, it is possible to more reliably and more accurately determine the authenticity by irradiating invisible light as compared with a conventional paper sheet having only a colored ink layer formed thereon.

If a blue ink is used as the colored ink, the blue colored ink reflects when irradiated with near-infrared light, which is an invisible light, but absorbs the yellow-green light, which is a visible light, so that it is visible. Accuracy of authenticity determination can be improved by combining with a light beam.

According to the paper sheet discriminating method of the present invention, the paper sheet is sent to a predetermined transport path, and visible light and non-visible light emitted from the light emitting element are emitted onto one side of the paper sheet moving on this transport path. Since both visible light and visible light are illuminated and the reflected light of these visible light and invisible light is received by the light receiving element, and the received light is analyzed to determine the authenticity of the paper sheet, the light is transmitted along the transport path. The sent paper sheet is irradiated with visible light and invisible light from the light emitting element on one side, and each reflected light is received by the light receiving element, and the received light can be subjected to predetermined analysis processing become.
As described above, since the paper sheet is irradiated with the visible light and the invisible light and is authenticated while being conveyed by being supplied to the conveyance path, the authentication processing can be performed quickly.

In the above-described determination method, if near-infrared light is used as the invisible light, the near-infrared light has a wavelength of about 880 nm and has a high absorption rate for ink that absorbs invisible light. It is possible to make the paper sheet suitable for authenticity discrimination for discriminating the authentic paper sheet.

If a photodiode is used as the light receiving element, the photodiode is a photosensitive electromotive element using cadmium, gallium, germanium, etc., and has a small size and excellent electromotive performance. It is suitable as a material for receiving the reflected light of the light beam irradiated on the substrate and converting it into an electric signal.

Further, by supporting the light emitting element and the light receiving element on the same support, it is possible to realize a compact mechanism for reading the reflected light from the paper sheet.

In addition, if a plurality of light-emitting elements and light-receiving elements are used as components of an image sensor that reads a sheet as an image, reflected light from the sheet can be captured as surface information by the image sensor. Becomes possible,
The accuracy of authenticity determination of paper sheets can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a paper sheet according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partially cutaway perspective view showing an embodiment of a paper sheet reading apparatus applied to the practice of the method of the present invention, showing a state in which a second frame is superimposed on a first frame. ing.

FIG. 4 is a partially cutaway perspective view showing an embodiment of a paper sheet reading apparatus applied to the practice of the method of the present invention, showing a state in which a second frame is separated from a first frame. .

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is a partially enlarged view showing a main part of FIG. 5;

FIG. 7 is a flowchart illustrating an embodiment of a control flow by a control unit.

FIG. 8 is a view for explaining the reflection and absorption states of each light beam on the base paper surface, the invisible light absorbing ink layer and the colored ink layer when the real and non-real voting tickets are irradiated with visible light and invisible light. FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper sheet reading device 10 paper sheet insertion slot 11 transport path 2 lower frame 21 bottom plate 22 side plate 23 front and rear plate 24 top plate 24 a rectangular long hole 25 bracket 26 connecting shaft 27 receiving stand 27 a edge dam 3 upper frame 31 bottom plate 32 Side plate 33 Front and rear plate 34 Top plate 35 Guide inclined plate 36 Spacer 37 Square hole 4 Conveying means 41 Lower roller 41a Lower horizontal shaft 42 Upper roller 43 Drive mechanism 44 Followed pulley 45 Auxiliary pulley 46 Drive pulley 47 Endless belt 48 Drive motor 48a Drive Axis 5 Image sensor 51 Casing 52 Light source 52a First light source 52b Second light source 53 Lens member 54 Light receiving unit 55 Glass plate 6 Holding member 61 Bottom plate 61a Light emitting hole 61b Flange portion 62 Support wall 62a Locking claw 7 Voting ticket 71 Base paper 72 Invisible light absorbing ink layer 73 Colored ink 8 the control means 81 voting card sensor 82 timer

Claims (8)

[Claims] 1. A paper sheet which is used for judging authenticity by receiving reflected light of radiated light and reading the written matter, comprising: a base paper; and an invisible light beam on at least one surface of the base paper. An invisible light absorbing ink layer formed by printing a tint block using an invisible light absorbing ink having an absorbing property, and a colored ink layer printed using colored ink on the base paper on which the ink layer is formed A paper sheet characterized by comprising: 2. The paper sheet according to claim 1, wherein the colored ink is blue. 3. A sheet is sent to a predetermined conveying path, and one side of the sheet moving on the conveying path is irradiated with both visible light and invisible light emitted from the light emitting element.
The reflected light of the visible light and the invisible light is respectively received by a light receiving element, and by analyzing the received light, it is determined whether or not the paper is the paper according to claim 1. How to distinguish paper sheets. 4. The method according to claim 3, wherein near infrared light is used as the invisible light. 5. The method according to claim 3, wherein a yellow-green light ray is used as the visible light ray. 6. The method according to claim 3, wherein a photodiode is used as the light receiving element. 7. The method according to claim 3, wherein the light emitting element and the light receiving element are provided on the same support. 8. The paper sheet according to claim 3, wherein a plurality of the light emitting elements and the light receiving elements are used as components of an image sensor that reads the paper sheet as an image. Classification method.