JP4915053B2 - Paper sheet identification device - Google Patents

Description

  The present invention relates to a paper sheet discriminating apparatus that discriminates the authenticity of paper sheets such as banknotes, securities, and cash vouchers.

  In recent years, counterfeit bills are easily manufactured with the spread of printers (color copies) and scanners. For this reason, the apparatus which detects the forged banknote of invention like patent document 1 is proposed, for example. The invention of Patent Document 1 reads an anti-counterfeit micro character printed on a banknote, acquires an image, and creates a Fourier transform image obtained by performing Fourier transform on the image. And the authenticity of a banknote is discriminate | determined by comparing the frequency component contained in a Fourier-transform image, and the threshold value memorize | stored beforehand.

JP 09-330450 A

  However, recent printers and the like are highly functional, and the printed portion of counterfeit banknotes has become so sophisticated that it is difficult to distinguish them from the real ones. For this reason, it has become difficult to determine the authenticity of a bill by reading a printed portion (micro characters) as in Patent Document 1, and it is desired that a more reliable authenticity determination result be obtained. ing.

  Accordingly, an object of the present invention is to provide a paper sheet discrimination device that can obtain a result of authenticity determination of paper sheets such as reliable banknotes, securities, and cash vouchers.

Means and effects for solving the problems

The present invention relates to a transmitted light irradiating unit that irradiates transmitted light to a paper sheet, a transmitted light receiving unit that receives transmitted light transmitted through the paper sheet, and a transmitted light received by the transmitted light receiving unit. A true / false discrimination unit that discriminates the authenticity of the leaf, a flat placement unit for placing the paper sheet irradiated with transmitted light, and the placed paper sheet in the placement unit A pressing portion having a flat plate to be pressed, and the flat plate of the pressing portion is used as a light guide plate that uniformly emits light incident from the end portion on the side surface side of the flat plate, and the sheet light is irradiated to the surface light. It has to.

  According to this configuration, since the authenticity is determined based on the transmitted light transmitted through the paper sheet, even if the fake paper sheet is skillfully printed, the true paper sheet Therefore, the authenticity of the paper sheet can be determined based on the difference from the transmitted light, and the authenticity determination result of the reliable paper sheet can be obtained. Specifically, when the paper sheet is printed by a general printer, the transmitted light amount received by the transmitted light receiving unit is different between the true paper sheet and the fake paper sheet. By comparing the transmitted light that has passed through the paper and the fake paper sheet, the authenticity of the paper sheet can be determined.

Furthermore, in another aspect, a transmitted light irradiating unit that irradiates the paper sheet with transmitted light, a transmitted light receiving unit that receives the transmitted light transmitted through the paper sheet, and reflected light that irradiates the paper sheet with reflected light. Based on the irradiation unit, the reflected light receiving unit that receives the reflected light reflected from the paper, the transmitted light received by the transmitted light receiving unit and the reflected light received by the reflected light receiving unit, the authenticity of the paper sheet A pressing unit having a flat mounting unit for mounting a paper sheet irradiated with transmitted light, and a flat plate for pressing the mounted paper sheet against the mounting unit. A light guide plate that uniformly emits light incident from an end portion on the side surface side of the flat plate, and irradiates the paper sheet with the light that emits the surface light .

  According to this configuration, the transmitted light and the reflected light are irradiated to the paper sheet, and the authenticity of the paper sheet is discriminated from the transmitted light transmitted through the paper sheet and the reflected light reflected from the paper sheet. It has become. In this case, true / false discrimination can be performed with high accuracy in comparison with the case of irradiating a sheet of paper with a single light to determine whether the paper is true or false.

  For example, when the paper sheet is a banknote, a “watermark” is formed on the banknote. The watermark portion of the true banknote has an uneven pattern created by a special manufacturing method, but the pattern of the watermark portion of the false banknote is only printed with ink toner or the like. The ink toner generally transmits infrared rays. Therefore, when the transmitted light is infrared, the amount of transmitted infrared light that passes through the watermark portion is different between a true bill and a false bill. Further, since the watermark portion of the false banknote including the ink toner reflects the obliquely irradiated light, the pattern of the watermark portion is clearly raised unlike the case of the true banknote. By determining the authenticity of the banknote based on the difference between the true banknote and the counterfeit banknote, it is possible to determine the authenticity with higher accuracy.

  In addition, the authenticity determination unit of the present invention includes a pattern acquisition unit that acquires a sheet pattern based on transmitted light received by the transmitted light receiving unit and / or reflected light received by the reflected light receiving unit. The configuration may be such that the authenticity of the paper sheet is determined based on the acquisition result of the pattern acquisition unit.

  According to this configuration, since the pattern is acquired and the authenticity of the paper sheet is determined based on the acquisition result, it is possible to determine the authenticity by the pattern of the paper sheet even if the transmitted light and reflected light received are the same. Thus, the authenticity of the paper sheet can be determined with higher accuracy.

  Further, the authenticity determination unit of the present invention has a detection unit that detects the material and / or thickness of the paper sheet based on the transmitted light received by the transmitted light receiving unit, and the detection result of the detection unit The authenticity of the paper sheet may be determined based on the above.

  According to this configuration, since the authenticity of the paper sheet is determined based on the material and / or thickness of the paper sheet, the paper sheet can be determined with higher accuracy.

  Furthermore, the transmitted light receiving unit and the reflected light receiving unit of the present invention may be configured by a single light receiving unit. According to this configuration, since the transmitted light receiving unit and the reflected light receiving unit are configured by one light receiving unit, it is possible to realize space saving and cost reduction of the apparatus.

  Hereinafter, preferred embodiments will be described with reference to the drawings.

  The paper sheet discrimination apparatus 1 according to the present embodiment places banknotes 10 one by one, and irradiates the watermark 10a of the placed banknotes 10 with infrared light (transmitted light) and visible light (reflected light). The pattern of the watermark portion 10a is acquired from the transmitted light amount of the infrared rays transmitted through the watermark portion 10a and the reflected light amount of the visible light reflected from the watermark portion 10a, and the authenticity of the bill, that is, the regular bill 10 is obtained. It is a device that discriminates (determines) whether the banknote 10 is fraudulently forged. In the following description, the regular banknote 10 is referred to as a genuine note, and the illegally forged banknote 10 is referred to as a counterfeit. In addition, in this Embodiment, although the object which discriminate | determines authenticity is demonstrated as a banknote, the paper sheet discrimination | determination apparatus 1 can be used also for paper sheets, such as a security and a gold certificate.

  The genuine note watermark portion 10a is formed with an uneven human figure (pattern) by a special manufacturing method, but the false note watermark portion 10a is printed with a person pattern (pattern) with general ink toner. There are many. For this reason, since the optical characteristics in the watermark part 10a of genuine bills and counterfeits are different, the authenticity of the banknote 10 can be determined by irradiating the watermark part 10a with infrared rays or visible light and receiving them. It has become.

(Structure of paper sheet discrimination device)
As shown in FIGS. 1 and 2, the paper sheet discrimination apparatus 1 is provided with a housing 2 having a flat placement portion 2 a for placing a bill 10 and a bill 10 placed on the placement portion 2 a. A pressing unit 3 that can be pressed vertically, an infrared LED 4 (transmitted light irradiation unit), a blue LED 5 (reflected light irradiation unit), and a CCD (Charge Coupled Device) sensor 6 (transmitted light receiving unit, reflected light receiving unit) ) And display LEDs 7a and 7b. In addition, the placement portion 2a of the housing 2 is provided with a hole 2b that is at least larger than the watermark portion 10a in a portion overlapping with the watermark portion 10a of the placed bill 10. By providing the hole 2b, infrared rays described later can be transmitted through at least the watermark 10a of the banknote 10, and visible light irradiated from the lower side of the banknote 10 can be reflected by the watermark 10a of the banknote 10. It can be done.

  The pressing portion 3 includes a handle 3a and a flat plate 3b. The flat plate 3b is arranged in parallel with the placement portion 2a and is provided to be movable in the vertical direction. And the handle 3a is provided in the upper surface of the flat plate 3b, and the lower surface of the flat plate 3b is closely_contact | adhered with the mounting part 2a by pushing down the handle 3a below. Further, a switch (not shown) is provided on the flat plate 3b and the placement portion 2a. When the lower surface of the flat plate 3b and the placement portion 2a come into contact with each other, the switch is turned on, and an infrared LED 4 and a blue LED 5 described later are bills. Ten watermark portions 10a are irradiated with infrared rays and visible light, and authenticity verification of the banknote 10 is started. Such a switch may be a contact type switch or a non-contact type switch using a sensor or the like.

  As described above, by configuring the flat plate 3b of the pressing portion 3 so as to be in close contact with the placement portion 2a, the banknote 10 placed on the placement portion 2a can be pressed, thereby causing wrinkles. Even the banknote 10 can stretch such wrinkles. Thereby, infrared rays from LEDs 4 and 5 described later can be transmitted to the watermark portion 10a, and visible light can be reflected to the watermark portion 10a. As a result, the authenticity of the banknote 10 can be identified with higher accuracy.

  In the present embodiment, the discrimination is started by pushing down the pressing unit 3. However, when the banknote 10 is placed on the placement unit 2 a, it is detected by the sensor and the discrimination is started. Alternatively, a banknote 10 transport device may be provided to automatically transport the banknote 10 to the placing portion 2a for discrimination.

  The infrared LED 4 is provided substantially horizontally in the flat plate 3b of the pressing unit 3, and when the switches provided on the flat plate 3b and the mounting unit 2a are turned on, the infrared LED is irradiated horizontally. Moreover, said flat plate 3b has a light-guide plate (not shown) inside, and irradiates the infrared rays irradiated horizontally to the banknote 10 mounted in the mounting part 2a substantially perpendicularly. ing. Here, the light guide plate is a plate that causes a special process to be applied to the surface of the acrylic plate so that the light that has entered from the end face is surface-emitting uniformly. Note that the infrared light irradiated on the banknote 10 is irradiated on at least the watermark portion 10a of the banknote 10, and the infrared light irradiated on the banknote 10 passes through the hole 2b and is received by a CCD sensor 6 described later. It has become so.

  In the present embodiment, the infrared LED 4 is provided and the infrared ray is transmitted through the banknote 10, but the combination of visible light and infrared light may be transmitted through the banknote 10. In this case, even if the transmitted light is irradiated to the watermark portion 10a and the other area, the wavelength band of visible light does not overlap with the wavelength band of infrared light, and the watermark of the banknote 10 is not overlapped. Since the optical characteristics of the portion 10a and other regions are different, the watermark portion 10a and other regions can be more clearly distinguished, so that the authenticity of the banknote 10 can be easily distinguished. Become. Moreover, it is good also considering the transmitted light permeate | transmitted as the banknote 10 as an ultraviolet-ray.

  The blue LED 5 is provided inside the housing 2, and emits blue visible light obliquely when the switches provided on the flat plate 3b and the mounting portion 2a are turned on. Specifically, the blue LED 5 is provided so as to irradiate blue visible light obliquely from the lower side of the banknote 10 to the watermark section 10a of the banknote 10 through the hole 2b of the placement section 2a. In the present embodiment, the genuine note watermark portion 10a is yellow or magenta and the visible light is blue which is a complementary color of yellow or magenta. However, it may be light blue or green, Any visible light having a color complementary to the color of the watermark 10a may be used.

  As will be described in detail later, when light strikes a substance, a complementary color of the substance surface color is absorbed by the substance, and light of other colors is reflected. That is, when the complementary color visible light of the watermark portion 10a is obliquely irradiated, the visible light is absorbed in the case of the genuine note watermark portion 10a, but in the case of the false note watermark portion 10a printed with ink toner, The irradiated visible light is reflected and received by a CCD sensor 6 described later. Here, the complementary color is a color located on the opposite side of the color selected when the spectrum of the color changing from red → orange → yellow → green → blue → purple is made into a circle.

  In addition, in the paper sheet discrimination apparatus 1 of this Embodiment, although provided with blue LED5 as a light source which irradiates reflected light, it is provided with the light source (for example, LED) provided with three colors of RGB, and is irradiated by setting. You may make it the structure which can change the color of light (selection). In this case, even if the paper sheet for determining authenticity is other than the banknote 10, it can be easily applied by selecting a color.

  The CCD sensor 6 is a line sensor in which light receiving elements that convert to electricity are arranged in one row and converts a change in light into an electric signal independently for each pixel. It is provided so as to face the hole 2b. Then, infrared light from the infrared LED 4 that has passed through the watermark portion 10a and visible light from the blue LED 5 that has been reflected by the watermark portion 10a are received. By receiving infrared light and visible light with a single sensor, it is possible to realize space saving and cost reduction of the apparatus. When the CCD sensor 6 receives infrared rays or visible light, it transmits data to the controller 11 described later. And the authenticity of the banknote 10 is discriminated in the controller 11. Such a discrimination method will be described later.

  In the present embodiment, visible light is emitted from the blue LED 5 and visible light reflected from the watermark portion 10a is received by the CCD sensor 6. However, the sensor that receives visible light is a CMOS sensor, A line image sensor in which a visible light source or the like is integrated may be used. In this case, space saving of the apparatus can be realized.

  The display LEDs 7a and 7b are provided on the upper surface of the housing 2, and notify the authenticity discrimination result of the banknote. Specifically, the display LED 7a is a blue LED, and the display LED 7b is a red LED. And when the discrimination result of the banknote 10 is true, that is, when the banknote 10 is a genuine note, the display LED 7a (blue LED) is emitted, and when the discrimination result of the banknote 10 is false, that is, the banknote 10 is a counterfeit. In the case, the display LED 7b (red LED) emits light. Thereby, the authenticity of the banknote 10 can be distinguished. Note that a buzzer (not shown) is provided inside the housing 2, and when the bill 10 is a fake note, the buzzer sounds at the same time as the display LED 7 b (red LED) emits light.

(Electrical configuration of the device)
The paper sheet discrimination apparatus 1 described above is controlled by a controller 11 provided inside the housing 2, and the controller 11 is operated by being supplied with electric power from a battery 19. As illustrated in FIG. 3, the controller 11 includes a calculation unit 12 (authentication determination unit, pattern acquisition unit, detection unit), an LED drive unit 13, an A / D conversion unit 14, and an amplifier 15. ing. The calculation unit 12 includes a microcomputer including a RAM, a ROM, a CPU, and the like. The calculation unit 12 acquires a pattern (pattern) of the watermark unit 10a based on the light reception data from the CCD sensor 6, and the acquired pattern. The process of discriminating the authenticity of the banknote 10 based on the above, the process of informing the authenticity discrimination result, etc. are executed. The LED drive unit 13 enables the infrared LED 4, the blue LED 5, and the display LEDs 7a and 7b to emit light. The A / D conversion unit 14 is connected to the CCD sensor 6 and enables the signal from the CCD sensor 6 to be converted into a digital quantity and captured. The amplifier 15 amplifies the signal read by the CCD sensor 6 so as to be processed, and inputs the amplified signal to the A / D converter 14. In the present embodiment, power is supplied from the battery 19 to the controller 11. However, power may be supplied from an external power supply (AC power supply, solar battery, etc.).

(Difference method)
Next, the authenticity discrimination process of the banknote 10 which is the process in the calculating part 12 of the paper sheet discrimination apparatus 1 comprised as mentioned above is demonstrated.

  The calculation part 12 discriminates the authenticity of the banknote 10 based on the infrared rays and visible light received by the CCD sensor 6. Specifically, the arithmetic unit 12 discriminates the authenticity of the bill 10 from the infrared light received by the CCD sensor 6 on the one hand, and discriminates the authenticity of the bill 10 from the visible light received by the CCD sensor 6 on the other hand. The authenticity of the final banknote 10 is determined based on one discrimination result. First, the authenticity discrimination method using infrared rays will be described.

(Infrared discrimination method)
As described above, the optical characteristics of the genuine note and counterfeit note watermark portions 10 are different. Specifically, the genuine note watermark portion 10a has a concavo-convex pattern formed by a special method, and when the watermark portion 10a is irradiated with infrared rays, the transmittance of the transmitted infrared rays is reduced (changed) by the concavo-convex portions. It is supposed to be. However, since the counterfeit watermark 10a is printed with a general ink toner having a property of almost transmitting infrared rays, the infrared transmittance hardly changes. Therefore, in the case of a genuine note, the pattern (pattern) of the watermark portion 10a can be acquired based on the change in the amount of transmitted infrared light that passes through the watermark portion 10a. Since there is no change, the pattern of the watermark unit 10a cannot be acquired. Thereby, the authenticity of the banknote 10 can be identified.

  As a method of discriminating the authenticity of the banknote 10 from the acquired pattern, a pattern (wave) that repeats light and dark alternately is formed from the acquired pattern, and the repetition is regarded as a frequency (spatial frequency). You may make it perform discrimination based on. Further, discrimination may be performed by comparing the amplitude of the above-described light and dark with genuine note data stored in advance.

  In addition, the calculation unit 12 detects the thickness and material of the banknote 10 based on the amount of transmitted infrared light received by the CCD sensor 6. That is, the thickness and material data of the genuine note are stored in advance, and the thickness and material of the bill 10 are detected from the received transmitted light amount of the infrared ray and collated with the stored data. And when it corresponds, it can discriminate | determine that it is a genuine note. Thereby, since authenticity is discriminate | determined also from thickness or a material, authenticity of the banknote 10 can be discriminate | determined more correctly.

(Discrimination method using visible light)
Next, a true / false discrimination method using visible light will be described. As already described above, as a characteristic of light, when light hits a substance, the complementary color of the substance surface color is absorbed by the substance, and the rest is reflected. That is, when visible light that is the complementary color of the genuine note watermark portion 10a is irradiated, it is not reflected by the watermark portion 10a. Therefore, in the case of a genuine note, the pattern of the watermark portion 10a can be obtained depending on the visible light. Can not. On the other hand, since the watermark portion 10a of the counterfeit note is printed with ink toner, visible light is reflected, and the reflected visible light can be received by the CCD sensor 6. Thereby, the pattern of the watermark part 10a can be acquired. Therefore, when the pattern of the watermark part 10a can be acquired by the visible light received by the CCD sensor 6, it can be identified as a fake ticket.

  When the watermark portion 10a is not printed with a counterfeit note, the visible light is not reflected as in the case of the genuine note, and the pattern of the watermark portion 10a cannot be obtained depending on the visible light.

  FIG. 4 is a data table of the pattern result of the watermark unit 10a obtained by the above-described method. The authenticity of the banknote 10 is identified based on the data table of FIG. Specifically, in both the case of a genuine note and a case of a fake note, the pattern of the watermark portion 10a cannot be acquired unless the watermark portion 10a is irradiated with light. In the case of a genuine note, even if blue visible light is irradiated, the visible light is not reflected by the watermark portion 10a, and the pattern of the watermark portion 10a cannot be acquired. . Further, when the infrared rays are irradiated, the pattern of the watermark portion 10a can be acquired from the difference in the amount of transmitted light that passes through the watermark portion 10a.

On the other hand, if the watermark portion 10a is not printed with a fake ticket, the visible light is not reflected by the watermark portion 10a even if it is irradiated with visible light, and the pattern of the watermark portion 10a cannot be acquired. , “No watermark”. Further, even when irradiating infrared rays, since there is no thickness (unevenness) in the watermark portion 10a, since the amount of transmitted light without change, it is impossible to obtain a pattern of the watermark portion 10a, the "no watermark".

Further, when the watermark portion 10a is printed with a counterfeit note, the visible light is reflected by the influence of the ink toner that forms the watermark portion 10a when irradiated with visible light, so the pattern of the watermark portion 10a is acquired. It becomes "with watermark". Further, even when infrared rays are irradiated, the watermark portion 10a has no thickness (unevenness), and the ink toner transmits almost infrared rays, so that the transmitted light amount does not change and the pattern of the watermark portion 10a is obtained. Cannot be performed, so “ no watermark” is displayed.

  That is, based on the data table of FIG. 4, when the discrimination result by visible light is “no watermark” and the discrimination result by infrared becomes “watermark”, the banknote 10 placed on the placement unit 2a is It can be identified as a genuine note. In this way, by determining the authenticity of the banknote 10 from the two data, a more reliable and highly accurate determination result of the authenticity in comparison with the case of determining the authenticity from one data. Can be obtained. In addition, since the authenticity is discriminated based on the received light quantity and the reflected light quantity based on the property that the light characteristics are different, even a counterfeit printed cleverly printed that cannot be distinguished from a genuine note at a glance is reliable. A discrimination result can be obtained.

(Operation of paper sheet discrimination device)
Next, the operation of the paper sheet discrimination apparatus 1 configured as described above will be described. As shown in FIG. 5, the paper sheet discrimination device 1 first acquires initial data of the CCD sensor 6 when the power is turned on (S1). Next, it is determined whether or not the start switch is turned on (S2). Specifically, it is determined whether or not the pressing unit 3 is pressed, the flat plate 3b of the pressing unit 3 is in contact with the mounting unit 2a, and the switch is turned on. If the start switch is not turned on (S2: NO), S2 is repeated. When the start switch is turned on (S2: YES), the infrared LED 4 and the blue LED 5 are driven to irradiate the watermark portion 10a with infrared light and visible light (S3). Then, the CCD sensor 6 receives infrared light and reflected visible light transmitted through the watermark portion 10a (S4), acquires the pattern of the watermark portion 10a based on the received data, corrects the acquired pattern, (S5). Here, when the data received by the CCD sensor 6 is small and cannot be corrected and normalized, the brightness of the infrared LED 4 and the blue LED 5 may be increased and the transmitted light and the reflected light may be received again. In this case, it is possible to eliminate the possibility that the accuracy of the authenticity determination of the banknote 10 is lowered because data processing cannot be performed.

  And based on the acquired pattern, the authenticity of the banknote 10 is discriminated (S6), and it is determined whether the banknote 10 is a genuine note as a result of the discrimination (S7). When the bill 10 is a genuine note (S7: YES), the display LED 7a (blue LED) is emitted to notify that it is a genuine note, and the process returns to S2 and the above operation is repeated. When the banknote 10 is not a genuine note (S7: NO), the buzzer 17 and the display LED 7b notify that the banknote 10 is a fake note (S9), and return to S2 to repeat the above operation.

  As described above, the paper sheet discriminating apparatus 1 according to the present embodiment uses the infrared LED 4 that irradiates the bill 10 with infrared rays, the CCD sensor 6 that receives infrared rays transmitted through the bill 10, and the infrared rays received by the CCD camera 6. And a calculation unit 12 for determining whether the bill 10 is true or false.

  According to this configuration, since the authenticity is determined based on the infrared rays that pass through the banknote 10, even if the counterfeit bills are skillfully printed, due to the difference from the infrared rays that pass through the true bills. The authenticity of the banknote 10 can be determined, and a reliable determination result of the banknote 10 can be obtained. Specifically, when the banknote 10 is printed by a general printer, the transmitted light amount received by the CCD sensor 6 is different between the genuine note and the counterfeit note. For example, infrared rays transmitted through the genuine note and the counterfeit note are transmitted. By comparing, the authenticity of the banknote 10 can be determined.

  In addition, the paper sheet discrimination device 1 of the present embodiment is configured to convert the blue LED 5 that irradiates the bill 10 with visible light, the CCD sensor 6 that receives visible light reflected from the bill 10, and the visible light received by the CCD sensor 6. And a calculation unit 12 for determining whether the bill 10 is true or false.

  According to this configuration, since the authenticity of the bill 10 is reflected based on the visible light, the visible light reflected on the genuine note is reflected even if the counterfeit note is skillfully printed. Therefore, the authenticity of the banknote 10 can be determined, and a reliable determination result of the banknote 10 can be obtained. Specifically, when the banknote 10 is printed by a general printer, the amount of reflected light received by the CCD sensor 6 is different between the genuine note and the counterfeit note. For example, visible light reflected from the genuine note and the counterfeit note is reflected. By comparing the two, the authenticity of the bill 10 can be determined.

  Furthermore, the paper sheet discrimination device 1 of the present embodiment includes an infrared LED 4 that irradiates the bill 10 with infrared rays, a CCD sensor 6 that receives infrared rays that have passed through the bill 10, and a CCD sensor 6 that irradiates the bill 10 with visible light. And a CCD sensor 6 that receives visible light reflected from the banknote 10 and a calculation unit 12 that determines the authenticity of the banknote 10 based on infrared rays and visible light received by the CCD sensor 6.

  According to this configuration, the bill 10 is irradiated with infrared light and visible light, and the authenticity of the bill 10 is discriminated from the infrared light transmitted through the bill 10 and the visible light reflected from the bill 10. In this case, true / false discrimination can be performed with high accuracy in comparison with the case where the banknote 10 is irradiated with one light and the true / false of the banknote 10 is discriminated.

  For example, a “watermark” is formed on the banknote. The watermark portion of the true banknote has an uneven pattern created by a special manufacturing method, but the pattern of the watermark portion of the false banknote is only printed with ink toner or the like. The ink toner generally transmits infrared rays. Therefore, when the transmitted light is infrared, the amount of transmitted infrared light that passes through the watermark portion is different between a true bill and a false bill. Further, since the watermark portion of the false banknote including the ink toner reflects the obliquely irradiated light, the pattern of the watermark portion is clearly raised unlike the case of the true banknote. By determining the authenticity of the banknote based on the difference between the true banknote and the counterfeit banknote, it is possible to determine the authenticity with higher accuracy.

  Moreover, the calculating part 12 of this Embodiment acquires the pattern of the banknote 10 based on the infrared rays and / or visible light which CCD sensor 6 received, and discriminate | determines the authenticity of the banknote 10 based on an acquisition result. It is a configuration.

  According to this configuration, since the pattern is acquired and the authenticity of the banknote 10 is identified based on the acquisition result, even if the received infrared light or visible light is the same, the authenticity is identified by the pattern of the banknote 10. The authenticity of the banknote 10 can be identified with high accuracy.

  Moreover, the calculation part 12 of this Embodiment detects the material and / or thickness of the banknote 10 based on the transmitted light which CCD sensor 6 received, and discriminate | determines the authenticity of the banknote 10 based on a detection result. To do.

  According to this structure, since the authenticity of the banknote 10 is discriminate | determined also based on the material and / or thickness of the banknote 10, the banknote 10 can be discriminated more highly accurately.

  Furthermore, this embodiment is configured to receive infrared light and visible light by one CCD sensor 6. According to this configuration, it is possible to realize space saving and cost reduction of the apparatus.

  Moreover, although this invention was demonstrated based on suitable embodiment, this invention can be changed in the range which does not exceed the meaning. That is, although the authenticity result of the banknote 10 is notified using the display LEDs 7a and 7b and the buzzer 17, the result may be notified by other methods. Further, the blue LED 5 irradiates the watermark 10 a with visible light from the lower side of the banknote 10, but it may be irradiated from the upper side of the banknote 10. In this case, a CCD sensor for receiving visible light reflected on the upper side of the banknote 10 must be disposed. Moreover, you may make it irradiate visible light from both the upper side and the lower side of the banknote 10, or it is provided with any one of infrared LED4 and blue LED5, and it discriminate | determines authenticity of the banknote 10. Also good.

  Further, in the present embodiment, the infrared LED is irradiated with infrared rays in the horizontal direction, and the light guide plate irradiates the bill watermark portion 10a perpendicularly, but the infrared LED directly irradiates the watermark portion 10a perpendicularly. You may do it. Further, the transmitted light that transmits the banknote 10 may be ultraviolet rays. Further, the light source for irradiating light may be a light source other than the LED. And when authenticating authenticity of the banknote 10 like this Embodiment, you may make it irradiate light to areas other than the watermark part 10a of the banknote 10, and may authenticate authenticity.

  Furthermore, a means for adjusting the brightness of light emitted from the infrared LED 4 or the blue LED 5 may be provided. Specifically, when the data received by the CCD sensor 6 is small and data processing is difficult, the lightness of the infrared LED 4 or the blue LED 5 may be increased, and the data processing may be performed by receiving the light again. In this case, it is possible to eliminate the possibility that the accuracy of the authenticity determination of the banknote 10 is lowered because data processing cannot be performed.

  In addition, the specific configuration and the like can be changed as appropriate, and the above-described embodiments may be combined as appropriate. The actions and effects described in the embodiments of the present invention are only listed the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what was done.

The figure which shows the external appearance of the paper sheet discrimination | determination apparatus of this invention. Schematic of the cross section in the II-II line | wire of FIG. The block diagram which shows the electrical constitution of a paper sheet discrimination device. The figure which shows the data table used for the authenticity discrimination of a banknote. The figure which shows the flowchart for demonstrating operation | movement of a paper sheet discrimination device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper sheet identification device 2 Case 2a Placement part 2b Hole 3 Pressing part 4 Infrared LED
5 Blue LED
6 CCD sensor 7a, 7b Display LED
10 banknote 10a watermark part

Claims (5)

A transmitted light irradiator for irradiating the paper with transmitted light;
A transmitted light receiving unit that receives the transmitted light transmitted through the paper sheet;
Based on the transmitted light received by the transmitted light receiving unit, comprising a true / false determination unit for determining the authenticity of the paper sheet ,
A flat placement portion for placing the paper sheet irradiated with the transmitted light, and a pressing portion having a flat plate for pressing the placed paper sheet against the placement portion,
A sheet of paper characterized in that the flat plate of the pressing portion is a light guide plate that uniformly emits light incident from an end portion on the side surface of the flat plate, and the light that emits the surface is irradiated to the paper. Identification device. A transmitted light irradiator for irradiating the paper with transmitted light;
A transmitted light receiving unit that receives the transmitted light transmitted through the paper sheet;
A reflected light irradiation unit for irradiating the paper sheets with reflected light;
A reflected light receiving unit that receives reflected light reflected from the paper sheet;
A true / false determination unit that determines the authenticity of the paper sheet based on the transmitted light received by the transmitted light receiving unit and the reflected light received by the reflected light receiving unit ;
A flat placement portion for placing the paper sheet irradiated with the transmitted light, and a pressing portion having a flat plate for pressing the placed paper sheet against the placement portion,
A sheet of paper characterized in that the flat plate of the pressing portion is a light guide plate that uniformly emits light incident from an end portion on the side surface of the flat plate, and the light that emits the surface is irradiated to the paper. Identification device. The paper sheet discrimination apparatus according to claim 2 , wherein the transmitted light receiving unit and the reflected light receiving unit are configured as one light receiving unit. The authenticity determination unit
Based on the transmitted light received by the transmitted light receiving unit and / or the reflected light received by the reflected light receiving unit, a pattern acquisition unit that acquires the pattern of the paper sheet,
The paper sheet discrimination apparatus according to any one of claims 1 to 3, wherein authenticity of the paper sheet is determined based on an acquisition result of the pattern acquisition unit. The authenticity determination unit
Based on the transmitted light received by the transmitted light receiving unit, it has a detection unit for detecting the material and / or thickness of the paper sheet,
The paper sheet discrimination apparatus according to any one of claims 1 to 4, wherein authenticity of the paper sheet is determined based on a detection result of the detection unit.

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