JP3474426B2 - Paper sheet authenticity discrimination device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet authenticity discriminating apparatus for discriminating the authenticity of a paper sheet.

[0002]

2. Description of the Related Art As a paper sheet authenticity discriminating device for discriminating the authenticity of a paper sheet, one using infrared rays and one using visible light (Japanese Utility Model Publication No. 5-79675) are used. There is. The conventional paper sheet authenticity determination device using infrared rays is
First, infrared rays are projected onto an appropriate detection area of a sheet to be discriminated, and reflected infrared light from the detection area is received by an infrared light receiving element and photoelectrically converted. This photoelectric conversion waveform is compared with the photoelectric conversion waveform of the detection area of the genuine paper sheet stored in advance, and when the comparison result is within a certain allowable range, the determination target paper sheet is the genuine paper sheet. When the comparison result is outside the permissible range,
The determination target paper sheet is determined to be a non-genuine paper sheet. That is, in a paper sheet authenticity determination device using infrared rays, paying attention to the fact that a difference occurs in the absorption rate of infrared rays depending on the paper and the printing ink that make up the paper sheet. In the form of photoelectric conversion waveform output from the light receiving element, the difference in the infrared absorption rate caused by the difference in the paper and printing ink in is obtained, and compared with that of the genuine paper sheet Determine non-authenticity.

Further, a conventional paper sheet authenticity discriminating apparatus using visible light projects visible light onto an appropriate detection area of a paper sheet to be discriminated and receives reflected light from the detection area with a light receiving element. Then, photoelectric conversion is performed. At this time, the reflected light intensity changes depending on the characters, figures, symbols, patterns, etc. printed on the surface of the paper sheet. Then, according to this, the photoelectric conversion waveform obtained by the light receiving element is compared with the photoelectric conversion waveform of the detection area of the genuine paper sheet stored in advance, and the comparison result is within a certain allowable range. Sometimes, it is determined that the discrimination target paper sheet is a genuine paper sheet, and when the comparison result is outside the permissible range, the discrimination target paper sheet is determined to be a non-genuine paper sheet. As described above, the conventional paper-sheet authenticity discriminating apparatus uses either infrared rays or visible light, but the characters, figures, symbols, patterns, etc. printed on the paper sheets are planarized. It is treated as a thing.

[0004]

However, such a conventional paper sheet authenticity discriminating apparatus treats characters, figures, symbols, patterns, etc. printed on the paper sheets as planar ones, and Infrared or visible light is projected onto the surface of a paper sheet, and it is determined whether the target paper sheet is a genuine paper sheet or a non-genuine paper sheet based on the intensity of the reflected light. Therefore, it cannot be said that the accuracy of authenticity discrimination of paper sheets is sufficient. That is, in recent years, with the improvement of the lithographic printing technology and the accuracy of the copying machine, the intensity of the reflected light of infrared rays or visible light from the surface of the discrimination target paper sheet on which characters and patterns are applied is The difference between the paper sheet and the non-genuine paper sheet becomes vague, and in the conventional device that uses them as an index for discrimination, whether the paper sheet to be discriminated is a genuine paper sheet or a non-genuine paper sheet. It has become difficult to accurately select. In particular, when non-genuine paper sheets made by copying genuine paper sheets with a copying machine have been developed in today's copying technology, when visible light is projected to be discriminated by a conventional paper sheet authenticity discrimination device that uses visible light. However, the waveform of the reflected light has almost the same waveform as the reflected light when visible light is projected on the genuine paper sheet, and there is a problem that it is not possible to appropriately discriminate the paper sheet.

Further, in the case of the conventional paper sheet authenticity discriminating apparatus using infrared rays, the current copying technique cannot completely copy even the change in the absorption rate of infrared rays, so that it is not a genuine paper sheet to some extent. Although it is possible to distinguish between genuine paper sheets, it is predicted that authenticity discrimination will not be easy in the future due to the rapid development of copying and printing technologies. There is a demand for a new paper-sheet authenticity discriminating device that discriminates between and. In addition, as a conventional paper sheet authenticity discriminating device, a magnetic material in printing ink is detected to discriminate between genuine paper sheets and non-genuine paper sheets, and in addition to this, There is a device that also detects the width and the thickness to make a determination. However, these techniques are imperfect and cannot make accurate discrimination. Furthermore, the measurement of the width and thickness of the paper sheet is originally an auxiliary, and it cannot be said that sufficient determination can be performed.

Therefore, an object of the present invention is to provide a paper sheet authenticity discriminating apparatus capable of discriminating non-genuine paper sheets copied by a copying machine more accurately.

[0007]

In order to achieve the above object, a paper sheet authenticity discriminating apparatus according to claim 1 of the present invention comprises a light source for irradiating a conveyed paper sheet with light, and the light source. The light receiving means for receiving the reflected light from the paper sheet of the light emitted from the paper sheet, and the paper sheet is a non-genuine paper sheet when the output changes regularly based on the output of the light receiving means. A light source and a light receiving means.
It is placed in a unit, and the unit is intersected with the paper feeding direction.
It is characterized in that it is configured to be movable in the direction of insertion .

That is, the paper sheets copied by the copying machine are attached to the paper so that the inks are regularly arranged, and the inks also have the same swelling in each arrangement. . Therefore, when the sheet conveyed by the light source is irradiated with light and the reflected light is received by the light receiving means, the output of the light receiving means changes regularly. Thus, it is determined that the paper sheet is a non-genuine paper sheet when the output of the light receiving unit changes regularly. Arrangement of light source and light receiving means in one unit
Then move the unit in a direction that intersects the paper sheet transport direction.
Since it is configured to be movable, paper sheets copied by a copying machine
When ink is transported, it is almost unrelated to the ink arrangement direction.
However, since the output of the light receiving means changes regularly,
In addition to being able to distinguish from non-genuine paper sheets,
Easily move with the light receiving means while maintaining the mutual positional relationship
Can be made.

According to a second aspect of the present invention, there is provided a paper sheet authenticity discriminating apparatus , which includes a light source for irradiating a conveyed paper sheet with light.
Receives the reflected light from paper sheets of the light emitted from the light source
Based on the light receiving means and the output of the light receiving means, the output is regulated
Discriminates paper sheets as non-genuine when they change
And two or more light sources are provided.
In addition, two or more of the light receiving means are paired for each light source.
An arbitrary light source and a light receiving means paired with the light source;
Fixedly placed and paired with any other light source.
And the light receiving means are arranged in one unit, and
The tray can be moved in a direction that intersects the paper transport direction.
And the determination means outputs the output of any one of the light receiving means.
When the output changes regularly,
The feature is that it is determined to be genuine paper sheets .

That is, paper sheets copied by a copying machine
Is attached to the paper so that the ink is regularly arranged
In addition, the ink has a similar rise for each array.
Will be caused. Therefore, it is transported by the light source
The paper is irradiated with light, and the reflected light is received by the light receiving means.
And the output of this light receiving means will change regularly.
Therefore, the discriminating means determines that the output of the light receiving means is based on this.
When a paper sheet is non-genuine when it changes regularly
Determine. Two or more light sources illuminate the same paper sheet,
Each reflected light is received by each light receiving means. Discrimination means Yes
When the output from any light receiving means changes regularly,
It is determined that the paper sheet is a non-genuine paper sheet. Therefore, a pair
The light source and the light receiving means of the
Moving the light means across the paper conveyance direction
Made it possible to convey paper sheets that were copied by a copying machine.
, Either output is regulated regardless of the ink arrangement direction.
It will change in a regular manner, and this is discriminated from non-genuine paper sheets.
can do.

[0011]

[0012]

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a paper sheet authenticity discriminating apparatus of the present invention will be described below with reference to FIGS. Note that, in the following, a bill is determined to be authentic as a paper sheet. In FIG. 1, reference numerals 11A, 11B, 11C, 1
1D shows the upper and lower conveyor belts for bill 1
Is a conveyance device that conveys the banknote 1 linearly in a predetermined direction (from right to left in FIG. 1) at a constant speed while sandwiching both sides in the length direction.

The paper sheet authenticity discriminating apparatus 10 moves from the conveying means 11A, 11B to the conveying means 11C, 11D during conveyance.
The banknote 1 is arranged so that it can be discriminated at the position where it is delivered to. In the following description, front and rear are front (downstream) and rear (upstream) in the conveyance direction of the bill 1, and left and right are left and right with respect to the conveyance direction of the bill 1.

The paper sheet authenticity discriminating apparatus 10 faces the banknote 1 being conveyed from the front upper side obliquely downward from the side view (that is, when viewed from a direction orthogonal to the banknote 1 conveying direction and parallel to the banknote). And a fixed position light source 14 that irradiates light in a direction parallel to the conveyance direction of the banknote 1 in plan view (when viewed from a direction orthogonal to the conveyance direction of the banknote 1 and orthogonal to the banknote), and a light source for the banknote 1. 14 is arranged on the upper side like the light source 14
It has a position-fixed photodiode (light receiving means) 15 which receives the reflected light from the banknote 1 of the light emitted from the banknote 1 and outputs an output signal according to the intensity of the reflected light by photoelectric conversion. Here, assuming that the irradiation angle of the light from the light source 14 with respect to the conveyance direction in plan view is the irradiation angle with respect to the conveyance direction, the irradiation angle is 0 ° in this case.

The line connecting the light source 14 and the photodiode 15 is parallel to the short side edge of the bill 1 being conveyed along the conveying direction. The angle of the light emitted from the light source 14 to the banknote 1 in the oblique downward direction is set so that the light is emitted to the banknote 1 at the Brewster angle.

The paper sheet authenticity discriminating apparatus 10 detects the output signal output from the photodiode 15 and discriminates the authenticity of the bill from the change state of the output signal, and a comparing discrimination circuit (discriminating means) 16. It has a ROM 17 in which an operation program of the paper sheet authenticity determination device 10 and the like are stored, and a RAM 18 in which detected output data and the like are stored.

Next, the authenticity determining operation of the paper sheet authenticity determining device 10 of the first embodiment will be described. Until the bill 1 is conveyed to the light irradiation position where the light from the light source 14 is irradiated, the photodiode 15 does not receive the reflected light even if the light is emitted from the light source 14, and therefore the comparison / determination circuit 16 Then, the output level of the photodiode 15 output to the above is low. The comparison / determination circuit 16 determines that the banknote 1 is not in the light irradiation position when the state in which the output level from the photodiode 15 is continuously low continues for a predetermined time or more.

When the bill 1 is conveyed from this state to the light irradiation position of the light source 14, the reflected light is detected by the photodiode 15, and the output level from the photodiode 15 output to the comparison / discrimination circuit 16 is accordingly detected. Is high. In this way, when the output level from the photodiode 15 is changed from the state in which the output level is low to the state in which the output level is high, the comparison / determination circuit 16 determines that the front end of the bill 1 in the transport direction is located at the light irradiation position at this point. To detect.

Then, the comparison / discrimination circuit 16 uses the bill 1
The timing is measured from the time when the front edge of the banknote 1 is detected, and the output signal of the photodiode 15 is detected for a predetermined predetermined period of time during which both ends of the bill 1 in the transport direction can be detected. The authenticity of the bill 1 is determined.

That is, a banknote printed by color printing or the like including copying in a copying machine has ink 2 as shown in FIG.
The 0s are sequentially arranged adjacent to each other and arranged in parallel so as to be attached to the paper, and the ink 20 causes the same swelling in each arrangement. In particular,
The swelling shape of each ink 20 is a semi-elliptical shape such that the shape in the lateral direction is highest at the center and becomes lower toward both ends from the center, and the shape in the longitudinal direction is the same position in the lateral direction. In this case, the height is constant regardless of the position in the longitudinal direction. The longitudinal direction of the ink 20 is the moving direction of the ink 20 during printing, and this direction is hereinafter referred to as the coloring direction.

Therefore, when the banknote 1 is irradiated with light from the light source 14, the movement of the banknote 1 changes the irradiation position of the light on the banknote 1, and the light reflection direction changes regularly. , A photodiode 15 that receives the reflected light
The output of will change regularly.

That is, as shown in FIG. 2, when the bill 1 is conveyed with its coloring direction orthogonal to the conveying direction (the direction indicated by the arrow X. The same applies hereinafter), the position where the light of the ink 20 is applied is determined. When the angle formed by the tangent line and the incident light from the light source 14 to the position is the incident angle and the light is applied to the apex of the mountain of the ink 20, the tangent line becomes parallel to the banknote 1 and the reflected light is as shown in FIG. As shown in, the light is reflected at the same angle as the incident angle and is detected by the photodiode 15. Therefore, the output signal of the photodiode 15 has a high level.

On the other hand, when the light irradiation position deviates from the apex of the mountain of the ink 20, the tangent line is not parallel to the banknote 1, so that the reflected light is not reflected toward the photodiode 15 as shown in FIG. Since it is not detected by the photodiode 15, the output signal of the photodiode 15 has a low level. Therefore, since the banknote 1 is conveyed at a constant speed, the photo of the predetermined period from the time when the front edge of the banknote 1 is detected to the time after a predetermined time elapses and the time after a predetermined time elapses further. Diode 15
Looking at the output of, the high level output signal periodically appears in the low level output signal.

Therefore, the comparison / determination circuit 16 determines whether or not there is a regular output change from the photodiode 15 in the above-described predetermined period, and when it is determined that there is a regular output change. It is determined that the bill 1 is a non-genuine bill.

On the other hand, when the banknote 1 is a genuine banknote, the above-mentioned regular rise of the ink 20 is not formed, so that the output from the photodiode 15 changes irregularly. Therefore, when it is determined that there is no regular output change in the output from the photodiode 15 in the predetermined period, it is determined that the bill 1 is an authentic bill.

As described above, the bills copied by the copying machine are attached to the paper so that the inks 20 are regularly arranged, and the inks 20 are similarly raised in each arrangement. Therefore, when the banknote 1 being conveyed is irradiated with light from the light source 14 and the reflected light is received by the photodiode 15, the output of the photodiode 15 changes regularly. Based on this, the discrimination circuit 16 determines that the discriminated bill 1 is a non-genuine bill when the output of the photodiode 15 changes regularly. Therefore, the non-genuine bill or the like copied by the copying machine can be more accurately discriminated.

It should be noted that, in the above, the case where the output for a predetermined period from the time point when the front edge of the banknote 1 is detected to the time point after a predetermined time period has elapsed and a time point after a further predetermined time period has elapsed is viewed is taken as an example. As described above, when the regular change in the output from the photodiode 15 continues for a predetermined period of time or longer between the front edge detection time and the rear edge detection time of the banknote 1, it is not It may be determined to be a genuine bill, and in other cases, it may be determined to be a genuine bill.

Next, the second embodiment of the paper sheet authenticity discriminating apparatus of the present invention.
2 to 5, the following description will focus on the differences from the first embodiment. The same parts as those in the first embodiment will be described with the same reference numerals.

In the first embodiment, when the banknote 1 is transported with the arrangement of the light source 14 and the photodiode 15 such that the coloring direction of the ink 20 is parallel or nearly parallel to the transport direction, the configuration shown in FIG. As shown in, the reflected light from the banknote 1 of the light emitted from the light source 14 is always detected by the photodiode 15, and the output signal from the photodiode 15 becomes almost constant, so that the regularity is maintained. No change in output will appear. The second embodiment deals with such a case.

A paper sheet authenticity discriminating apparatus 1 according to the second embodiment.
As shown in FIG. 3, 0 is a pair of pulleys 22 and 23 which are arranged above and below the banknote 1 so as to be separated from each other on the left and right, and an endless wire 24 wound around these pulleys 22 and 23.
A guide rail 25 arranged below the wire 24 so as to extend in the left-right direction; a unit 26 movably supported by the guide rail 25 and connected to the lower side of the wire 24; It has a motor (not shown) for driving one of 22 and 23.

Further, in the paper sheet authenticity discriminating apparatus 10 of the second embodiment, as shown in FIG. 3, the banknote 1 being conveyed, which is the same as that of the first embodiment, is viewed from the front in a side view. A light source 14 ′ that irradiates light in a direction parallel to the conveyance direction of the banknote 1 in a diagonally downward direction from the upper side, and a light source 14 ′ that is arranged on the same upper side as the light source 14 ′ for the banknote 1 and irradiated from the light source 14 ′. It has a photodiode 15 'which receives the reflected light from the bill 1 of the generated light and outputs an output signal according to the intensity of the reflected light by photoelectric conversion. The light source 14 ′ and the photodiode 15 ′ are attached to the unit 26. Further, the light source 14 ′ is set so that the oblique downward angle of the light radiated to the bill 1 is radiated to the bill 1 at the Brewster angle.

As a result, the wire 24 is rotated by driving one of the pulleys 22 and 23 with a motor (not shown), and the unit 26 and the light source 1 attached to the unit 26 are rotated.
4'and the photodiode 15 'to the guide rail 2
It will be moved in the left-right direction along 5.

Here, the drive speed of the pulleys 22 and 23 is
The light irradiation position of the light source 14 ′ is constant and the light irradiation position of the light source 14 ′ moves the banknote 1 in the left-right direction at the same time as the time required for the light irradiation position of the light source 14 ′ to cross the banknote 1 in the front-back direction as the banknote 1 moves. Is set to cross. Thereby, the light source 14 '
The irradiation position of is moved on the diagonal line of the bill 1 from the front end and one end in the left-right direction to the rear end and the other end in the left-right direction.

A paper sheet authenticity discriminating apparatus 1 according to the second embodiment.
The comparison / determination circuit 16 of 0 detects the output signal output from the photodiode 15 ′ and determines the authenticity of the bill 1 from the change state of the output signal.

Next, the authenticity determination operation of the paper sheet authenticity determination device 10 of the second embodiment will be described. First, the unit 26 waits in a state where the light irradiation position from the light source 14 'is arranged so that light can be irradiated to the front end and one end portion in the left-right direction of the banknote 1 being conveyed by the conveying devices 11A to 11D. ing.

Until the bill 1 is conveyed to the light irradiation position of the light source 14 ', the photodiode 15' does not receive the reflected light even if it is irradiated with the light from the light source 14 '. The output level from the photodiode 15 'output to the circuit 16 is in a low state. The comparison / determination circuit 16 determines that the banknote 1 is not in the light irradiation position when the state where the output level from the photodiode 15 'is continuously low continues for a predetermined time or more.

From this state, when the banknote 1 is conveyed to the light irradiation position of the light source 14 ', the reflected light is detected by the photodiode 15', so that the photodiode 15 'output to the comparison / discrimination circuit 16 outputs. The output level of is high. In this way, when the output level from the photodiode 15 ′ is changed from the state in which the output level is low to the state in which the output level is high, the comparison / determination circuit 16 determines that the front end of the banknote 1 and the one end in the left-right direction are at the light irradiation position. Is detected (this time is hereinafter referred to as a diagonal edge detection time).

Then, the comparison / discrimination circuit 16 includes the unit 2
6 is moved at a constant speed, the timing is measured from the time when the diagonal edge of the banknote 1 is detected, and a predetermined period of time during which both the edges of the banknote 1 in the transport direction and the edges of the banknote 1 in the transport orthogonal direction can be detected is determined. The output signal of the photodiode 15 'for a certain predetermined period is detected, and the authenticity of the bill 1 is determined from this output signal.

For example, as shown in FIG. 2, when a bill 1 copied by a copying machine is conveyed with its coloring direction orthogonal to the conveying direction, the bill 1 is moved so as to be removed from the light source 14 '. When the irradiation position of the light on the banknote 1 changes, the reflection direction of the light changes.

Specifically, the angle formed by the tangent line at the position where the light of the ink 20 is irradiated and the incident light from the light source 14 'to that position becomes the incident angle, and the light is irradiated to the top of the mountain of the ink 20. In this case, since the tangent line becomes parallel to the bill 1, the reflected light is reflected at the same angle as the incident angle as shown in FIG. 2, and is detected by the photodiode 15 ′. Therefore, the output signal of the photodiode 15 'becomes a high level.

On the other hand, when the light irradiation position deviates from the apex of the mountain of the ink 20, the tangent line is not parallel to the bill 1, so that the reflected light is not reflected toward the photodiode 15 'as shown in FIG. Therefore, it is not detected by the photodiode 15 ', and the output signal of the photodiode 15' becomes a low level. Therefore, since the banknote 1 is conveyed at a constant speed, a predetermined period from the time when the diagonal edge of the banknote 1 is detected to the time after a predetermined time elapses and the time after a predetermined time elapses further. Looking at the output of, the high level output signal periodically appears in the low level output signal.

When the bill 1 is conveyed with its coloring direction parallel to the conveying direction, when the irradiation position of the light on the bill 1 from the light source 14 'is changed by the movement of the unit 26, the reflection of the light is reflected. The direction changes.

Specifically, the angle formed by the tangent line at the position where the light of the ink 20 is irradiated and the incident light from the light source 14 'to that position is the incident angle, and the light is irradiated to the top of the mountain of the ink 20. In this case, since the tangent line becomes parallel to the bill 1, the reflected light is reflected at the same angle as the incident angle as shown in FIGS. 4 and 5, and is detected by the photodiode 15 ′. Therefore, the output signal of the photodiode 15 'becomes a high level.

On the other hand, as shown in FIG. 4 and FIG. 5, when the light irradiation position deviates from the peak of the mountain or the valley of the mountain due to the movement of the unit 26, the tangent line is not parallel to the banknote 1 and the reflected light is the photodiode. It does not reflect in the direction of 15 'and is therefore not detected by the photodiode 15' and the output signal of the photodiode 15 'is at a low level.

Therefore, since the unit 26 is fed at a constant speed, from the time point after a predetermined time has passed since the diagonal edge of the banknote 1 was detected to the time point after a predetermined time has passed. Looking at the output for a predetermined period of
A high level output signal periodically appears in the low level output signal.

As described above, the comparison / discrimination circuit 16 determines whether or not there is a regular output change from the photodiode 15 'in the above-described predetermined period, and determines that there is a regular output change. Sometimes it is determined that the bill 1 is a non-genuine bill.

On the other hand, when the banknote 1 is a genuine banknote, the above-described regular swelling of the ink 20 is not formed, so that the output of the photodiode 15 'changes irregularly. Therefore, when it is determined that the output of the photodiode 15 'has not changed regularly in the predetermined period, it is determined that the bill 1 is an authentic bill.

In the second embodiment described above, the direction of arrangement of the pair of light sources 14 'and the photodiode 15' is adjusted to the conveyance direction of the bill 1 and the light sources 14 'are arranged.
By moving the photodiode 15 'and the photodiode 15' at right angles to the transport direction of the banknote 1, when a banknote copied by a copying machine is transported, the arrangement direction of the ink 20 is parallel or orthogonal to the banknote transport direction. For banknote 1,
The output changes regularly, and this can be discriminated as a non-genuine bill. Therefore, it is possible to reliably discriminate the non-genuine bills copied by the copying machine.

Further, in the second embodiment, the light source 14 '.
And the photodiode 15 ′ are arranged in one unit 26, and the unit 26 is configured to be movable in the direction orthogonal to the conveyance direction of the banknote 1, so that the light source 14 ′ and the photodiode 15 ′ are positioned relative to each other. It can be easily moved while maintaining the relationship.

Further, in the second embodiment, the photo of the predetermined period from the time point after the detection of the diagonal edge of the banknote 1 to the time point after the predetermined time elapses and the time point after the predetermined time elapses further. Although the case where the output of the diode 15 ′ is viewed has been described as an example, as in the first embodiment, between the time when the diagonal end of the banknote 1 is detected and the time when the other diagonal end is detected, the photodiode 15 ′ is detected. It may be determined to be a non-genuine bill if the state in which a regular change appears in the output lasts for a predetermined fixed period or more, and to be a genuine bill in other cases.

Next, the third embodiment of the paper sheet authenticity discriminating apparatus of the present invention.
An embodiment of the present invention will be described below with reference to FIG. 6, focusing on differences from the first and second embodiments. The same parts as those of the first and second embodiments will be described with the same reference numerals.

First, in the second embodiment, it has been described that the bill 1 copied by the copying machine can be detected when the coloring direction of the bill 1 is conveyed in a direction orthogonal to or parallel to the bill conveying direction X. The direction in which the banknote 1 that has been copied, etc. is colored in the direction Y in which the unit 26 is orthogonal to the banknote transport direction X.
When the detection position on the banknote 1 coincides with or is parallel to the locus (referred to as a scan line SY) on the banknote 1, the unit 26 is moved so that the light emitted from the light source 14 ′ is emitted from the ink 20. The output signal from the photodiode 15 'becomes substantially constant by moving in parallel with the mountain, and no regular output change appears. The third embodiment deals with such a case.

Therefore, in the paper sheet authenticity discriminating apparatus 10 of the third embodiment, as shown in FIG. 6, a pair of position-fixed light source 14 and photodiode 15 similar to those of the first embodiment is used. , A movable light source 14 'similar to that of the second embodiment
And a pair of photodiodes 15 'are provided. That is, the banknote 1 being conveyed is illuminated with light from the front upper side in a diagonally downward direction, and in plan view, the light source 14 fixed to an unillustrated machine body that irradiates light in a direction parallel to the conveying direction X of the banknote 1,
The light source 1 is arranged on the upper side similar to the light source 14 with respect to the banknote 1.
Photodiode 1 fixed to a machine body (not shown) that receives the reflected light from bill 1 of the light emitted from 4 and outputs an output signal according to the intensity of the reflected light by photoelectric conversion
It has a pair of 5 and is attached to a unit 26 that is moved in a direction Y orthogonal to the banknote transport direction X by rotating one of the pulleys 22 and 23 by a motor (not shown) to rotate the wire 24. It has a light source 14 'and a photodiode 15'.

Each of the light sources 14 and 14 'is set so that the oblique downward angle of the light applied to the banknote 1 is applied to the banknote 1 at Brewster's angle. Here, the irradiation detection position PX of the light on the banknote 1 by the pair of the light source 14 and the photodiode 15 and the light source 1
The irradiation detection position PY of the light on the banknote 1 by the pair of 4'and the photodiode 15 'is determined by the above-mentioned restriction of the mounting angle.
The bills 1 are arranged so as to be displaced in the transport direction X. That is, since the light sources 14 and 14 'should be set so as to irradiate the banknote 1 at Brewster's angle, the light irradiation detection positions PX, PY on the banknote 1 in the conveyance direction X of the banknote 1 coincide with each other. This is because, if such an arrangement is made, the movement of the unit 26 may block the irradiation of light from either the light source 14 or the light source 14 '. Note that the period during which the light irradiation from any one is blocked is shorter than the period during which the unit 26 moves, so masking this period and making the outputs of the photodiodes 15 and 15 ′ ineffective. By performing processing such as the above, it is possible to arrange the banknotes 1 without shifting their positions in the transport direction X.

Then, the third paper sheet authenticity discriminating apparatus 1
The comparison / determination circuit 16 of 0 includes the photodiodes 15 and 1
The output signal output from 5'is detected, and the authenticity of the bill 1 is discriminated from the change state of the output signal from either one.

Next, the operation of authenticity determination of the paper sheet authenticity determination device 10 of the third embodiment will be briefly described. That is, the operation of authenticity determination by the pair of the light source 14 and the photodiode 15 fixed to the machine body is the same as the operation of the first embodiment described above, and the light source 14 ′ and the photodiode 15 supported by the unit 26. Since the operation of authenticity discrimination by the pair of 'is the same as the operation of the above-described second embodiment, here, a description will be added from another aspect.

First, in the true / false discrimination operation by the pair of the light source 14 and the photodiode 15 fixed to the machine body, as described above, the coloring direction of the ink 20 is parallel or nearly parallel to the conveyance direction X of the banknote 1. If it coincides with, the regular output change does not appear and the authenticity of the bill 1 cannot be determined. In this case, in the operation of authenticity determination by the pair of the light source 14 ′ and the photodiode 15 ′ supported by the unit 26, the coloring direction of the ink 20 coincides with the state in which the coloring direction of the ink 20 is parallel or nearly parallel to the transport direction X of the banknote 1. However, as described above, since the scan line SY as shown in FIG. 6 is not in the state of being coincident with or close to the coincidence, the output from the photodiode 15 'shows a regular change, whereby the bill 1 It will be possible to determine the truth.

On the other hand, the light source 1 supported by the unit 26
As described above, in the true / false determination operation by the pair of 4'and the photodiode 15 ', if the coloring direction of the ink 20 is in the state of being close to or close to the scan line SY as shown in FIG. Change of the output does not appear, and the authenticity of the bill 1 cannot be determined. In this case, in the authenticity determination operation by the pair of the light source 14 and the photodiode 15 fixed to the machine body, even if the coloring direction of the ink 20 is in the state of being close to or close to the scan line SY as shown in FIG. , As described above, the conveyance direction X of the banknote 1
The output from the photodiode 15 shows a regular change because it is not in a state parallel to or nearly parallel to, and thus the authenticity of the bill 1 can be discriminated.

As described above, the comparison / discrimination circuit 16 determines that the bill 1 is a non-genuine bill when it is determined that there is a regular output change from one of the photodiodes 15 and 15 '. On the other hand, the comparison / determination circuit 16 determines that the banknote 1 is an authentic banknote when no regular output change is obtained from any of the photodiodes 15 and 15 ′. Therefore, in the third embodiment, the light source 14 and the photodiode 15 ′ fixed to the airframe,
The light source 14 ′ and the photodiode 1 which are movable by the unit 26 in the direction Y orthogonal to the conveyance direction X of the banknote 1.
When a bill copied by a copying machine is conveyed by 5 ', the output from one of the photodiodes 15 and 15' will change regularly regardless of the arrangement direction of the ink 20. , This can be discriminated as a non-genuine bill. Therefore, it is possible to more reliably discriminate the non-genuine bills copied by the copying machine.

Further, in the third embodiment, the photo of the predetermined period from the time point when the diagonal edge of the banknote 1 is detected to the time point after the predetermined time elapses and the time point after the predetermined time elapses. The case where the outputs of the diodes 15 and 15 ′ are viewed has been described as an example. However, similarly to the first and second embodiments, from the time when the diagonal edge of the banknote 1 is detected to the time when the other diagonal edge is detected, When the state in which the output of the photodiodes 15 and 15 'has a regular change appears for a predetermined fixed period or longer, it is determined to be a non-genuine bill, and in other cases, it is determined to be a genuine bill. May be. Also,
In the above, the timing to start the genuine / counterfeit discrimination of the banknote is obtained by utilizing the output of the photodiodes 15 and 15 ′ and detecting the reflected light from either of them, and the output level has become high. However, the present invention is not limited to this, and a light source and a photodiode, which are arranged to sandwich the transportation of the bill, may be separately provided to obtain the timing for starting the genuine / counterfeit discrimination of the bill. Furthermore, in the above description, the bill authenticity discrimination is described as an example, but it goes without saying that it can be applied to various paper sheets other than bills.

[0062]

As described in detail above, the first aspect of the present invention
According to the paper sheet authenticity determination device described, the paper sheets copied by the copying machine are attached to the paper so that the inks are regularly arranged, and the inks are arranged in each arrangement. Since the same swelling will occur, when the paper sheet conveyed by the light source is irradiated with light and the reflected light is received by the light receiving means, the output of this light receiving means will change regularly, Therefore, based on this, the determining means determines that the paper sheet is a non-genuine paper sheet when the output of the light receiving means changes regularly. Therefore, it is possible to more accurately discriminate the non-genuine paper sheets copied by the copying machine. light
The source and the light receiving means are arranged in one unit, and the unit
Is configured so that it can move in a direction that intersects the paper sheet transport direction.
Therefore, the paper sheets copied by the copying machine are transported.
When receiving the light, the light receiving means is almost independent of the ink arrangement direction.
Since the output of will change regularly, we will call this a non-genuine paper sheet.
In addition to being able to discriminate, the light source and the light receiving means are mutually
It can be easily moved while maintaining the positional relationship of
Wear.

[0063]

According to the paper sheet authenticity discriminating apparatus of the second aspect of the present invention, the paper sheets copied by the copying machine are not ink.
It will be put on paper so that it will be regularly arranged,
Moreover, the ink causes similar swells in each array.
Therefore, light is emitted to the paper sheets conveyed by the light source.
When the light receiving means receives the reflected light, this light receiving means
Output will change regularly, so the discriminator
Based on this, the output of the light receiving means changes regularly.
When this is done, it is determined that the paper sheet is a non-genuine paper sheet. Shi
Therefore, the non-genuine paper sheets copied by the copying machine are made more authentic.
It can be accurately determined. Two or more light sources are provided, and two or more light receiving means are provided so as to make a pair with each light source, and one arbitrary light source and the light receiving means paired with the light source are fixedly arranged, and another arbitrary light source is provided. The light source and the light receiving means forming a pair are arranged in one unit, and the unit is configured to be movable in a direction intersecting the paper sheet conveying direction, and the discriminating means outputs one of the light receiving means. Based on the above, it is determined that the paper sheet is a non-genuine paper sheet when the output regularly changes. Therefore, the pair of light sources and the light receiving means are fixedly arranged, and the other light source and the light receiving means are moved so as to intersect with the paper sheet conveying direction, whereby the paper sheets copied by the copying machine are conveyed. In this case, one of the outputs changes regularly regardless of the ink arrangement direction, and this can be discriminated as a non-genuine paper sheet.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a block diagram schematically showing a first embodiment of a paper sheet authenticity discriminating device of the present invention.

FIG. 2 is a perspective view showing a state of light from a light source 14 with respect to a banknote being conveyed according to the first embodiment of the paper-sheet authenticity discriminating apparatus of the present invention.

FIG. 3 is a front view schematically showing a second embodiment of the paper sheet authenticity determination device of the present invention.

FIG. 4 is a perspective view showing a state of light from a light source 14 ′ with respect to a banknote being conveyed in the second embodiment of the paper sheet authenticity discriminating apparatus of the present invention.

FIG. 5 is a light source 1 when viewed in the direction of the arrow in FIG.
It is sectional drawing which shows the state of the light from 4 '.

FIG. 6 is a plan view schematically showing a third embodiment of the paper sheet authenticity discriminating device of the present invention with a part omitted.

[Explanation of symbols]

1 banknote 10 Paper sheet authenticity discrimination device 14,14 'light source 15,15 'photodiode (light receiving means) 16 Comparison discrimination circuit (discrimination means) 26 units

Claims (2)

(57) [Claims] 1. A light source for irradiating the conveyed paper sheet with light, a light receiving means for receiving reflected light from the paper sheet of the light emitted from the light source, and an output based on the output of the light receiving means. Determining means for determining that the paper sheet is a non-genuine paper sheet when the output regularly changes , the light source and the light receiving means are arranged in one unit,
The unit can be moved in the direction that intersects the paper conveyance direction.
An authenticity determination device for paper sheets, which is characterized by being configured as a Noh . 2. Light for irradiating the conveyed paper sheets with light
The light source and the reflected light from the paper sheets of the light emitted from the light source.
The output changes regularly based on the light receiving means and the output of the light receiving means .
Discriminating means for sometimes discriminating that the paper sheet is a non-genuine paper sheet
And two or more light sources are provided, and the light receiving means is provided for each light.
Two or more sources are provided to form a pair, and any one light source and its
The light source and the light receiving means forming a pair are fixedly arranged, and the other arbitrary one
The light source of the
And place the unit in the paper feed direction.
It is configured to be movable in the direction of insertion, and the determination means is based on the output of any one of the light receiving means.
When the output changes regularly, the paper sheet is not genuine paper.
A paper sheet authenticity discriminating device characterized by discriminating that it is a leaf .