JP4872318B2 - Bill recognition device - Google Patents

Description

  The present invention relates to a bill recognition device used in a vending machine or the like.

  Hereinafter, the conventional banknote identification device will be described. As shown in FIG. 8, the conventional banknote recognition apparatus includes an insertion slot 2 into which a banknote 1 is inserted, a passage 3 connected to the insertion slot 2, and a conveying means 4 provided in the passage 3. An optical sensor 7 provided on the wall surface of the passage 3 and composed of a light emitting diode 5 and a light receiving transistor 6, a logarithmic amplifier 8 connected to the output of the light receiving transistor 6 forming the optical sensor 7, and the logarithm A linear amplifier 9 connected to the output of the amplifier 8, an A / D converter 10 connected to the output of the linear amplifier 9, and an output of the A / D converter 10 connected to one input and the other Are connected to the output of the memory 11, the discriminator 13 to which the output of the comparator 12 is connected, the output terminal 14 to which the output of the discriminator 13 is connected, and the discriminator 13. And light emitting diode A control unit 15 connected to a driver 16 connected to the output of the control unit 15, and consists of a motor 17 for driving the conveying means 4 is connected to the driver 16. Further, the memory 11, the comparator 12, and the discriminator 13 form an identification unit 18.

  About the banknote identification device comprised as mentioned above, the operation | movement is demonstrated below. The banknote 1 inserted from the insertion slot 2 is transported on the passage 3 by the transport means 4. During the conveyance of the bill 1, the graphic data of the bill 1 is converted into an electrical signal by the optical sensor 7 provided on the wall surface of the passage 3 and output. This electric signal is amplified by a logarithmic amplifier 8 and a linear amplifier 9 and then converted into digital data by an A / D converter 10.

  In the comparator 12, the digital data is compared with the data supplied from the optical sensor 7 at a plurality of specific positions of the banknote 1 and the output of the memory 11 storing the characteristic data of the banknote 1. Then, the authenticity or denomination of the banknote 1 inserted into the insertion slot 2 is discriminated by the next discriminator 13.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP-A-57-62477

  However, in such a conventional banknote identification device, the signal data supplied from the optical sensor 7 at a plurality of specific positions of the banknote 1 is compared with the output of the memory 11 storing the banknote characteristic data. When there is noise at a specific position of the banknote 1, there is a possibility that it is erroneously recognized.

  The present invention solves this problem, and an object of the present invention is to provide a banknote recognition apparatus with few erroneous recognitions.

Identifying portions of the bill identifying apparatus of the present invention to achieve this object, the data of a specific position of the bill to be outputted from the A / D converter, there is identified on the basis of the data of the sum of the specific section The sum data of the specific section may be the sum / difference data of the specific section obtained by summing the difference between the maximum value obtained by averaging the top several data of the specific section and the data of the specific section, or light emission, respectively. A plurality of optical sensors having different wavelengths, and sum data obtained by summing up the difference between the maximum value obtained by averaging the top several data of all data by the first optical sensor excluding the front and rear edges of the banknote and the data in the specific section And the specific section consisting of a ratio of a maximum value obtained by averaging the top several data excluding the front and rear edges of the banknotes of all data by the second optical sensor and sum data obtained by summing up the differences between the data of the specific section Japanese color difference data It is obtained by at least either one. Thereby, the intended purpose can be achieved.

According to the present invention, an insertion slot into which a bill is inserted, a passage connected to the insertion opening, a conveying means provided in the passage, an optical sensor provided on a wall surface of the passage, and the optical sensor An amplifier connected to the output of the amplifier, an A / D converter connected to the output of the amplifier, an identification unit connected to the output of the A / D converter, and an output connected to the output of the identification unit A banknote identification device for identifying the banknote based on the data of the specific position of the banknote output from the A / D converter and the sum data of the specific section, The sum data of the specific section is the sum / difference data of the specific section obtained by summing up the difference between the maximum value obtained by averaging the top several data of the specific section and the data of the specific section, or the emission wavelength, respectively. A plurality of optical sensors with different The sum of the difference between the maximum value obtained by averaging the top few data except the front and back edges of the banknotes and the data of the specific section of all the data by the optical sensor, and the total data by the second optical sensor At least one of the sum color difference data of the specific section, which is a ratio of the maximum value obtained by averaging the top few except the front and back bills and the sum data of the difference of the specific section data. It is a banknote identification device . Therefore, even if there is noise or the like, the data is averaged, and a banknote recognition device with few erroneous recognitions can be obtained.

  Moreover, since the optical sensor is used for the sensor, a space | interval can be provided between an optical sensor and a banknote. Accordingly, banknotes are not jammed in the passage and smooth conveyance is possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram of the banknote recognition apparatus in Embodiment 1 of the present invention. In FIG. 1, 22 is an insertion slot into which a bill 1 is inserted. And the passage 23 of the banknote 1 is connected to this insertion port 22. The passage 23 is provided with a conveying means 24 for conveying the banknote 1. 24a and 24b are pulleys, and 24c is a timing belt suspended on the pulleys 24a and 24b. These together constitute the conveying means 24.

  A light emitting diode 25a emits infrared light, and a light emitting diode 25b emits red light. Reference numeral 25c denotes a light emitting diode that emits blue light (here, when all of the light emitting diodes 25a, 25b, and 25c are represented, they are simply referred to as the light emitting diode 25). These light emitting diodes 25 are provided on the upper wall surface of the passage 23.

  A light receiving transistor 26 that receives light emitted from the light emitting diode 25 is provided on the lower wall surface of the passage 23 so as to face the light emitting diode 25. The light emitting diode 25 and the light receiving transistor 26 form a transmissive optical sensor 27.

  As described above, since the optical sensor 27 is used in the present embodiment, a minute gap can be provided between the banknote 1 and the optical sensor 27. Therefore, the banknote 1 can be prevented from being clogged in the passage 23 during transport, and the banknote 1 can be smoothly transported.

  The output of the light receiving transistor 26 is connected to the input of the logarithmic amplifier 28. The reason why the logarithmic amplifier 28 is used is to amplify the signal of the optical sensor 27 over a wide range without distortion. The output of the logarithmic amplifier 28 is connected to the input of a linear amplifier 29, and the output of the linear amplifier 29 is connected to the input of an A / D converter 30.

  The output of the A / D converter 30 is connected to the input of the identification unit 41 for identifying the authenticity and denomination of the banknote 1 inserted into the insertion slot 22, and the output of the identification unit 41 is output to the output terminal 42. It is connected.

  Reference numeral 35 denotes a control unit. The control unit 35 is connected to the identification unit 41 and the light emitting diode 25 and is also connected to the driver 36, and controls the identification unit 41 and lighting of the light emitting diode 25. The output of the driver 36 is connected to a motor 37 that drives the conveying means 24, and the motor 37 is also controlled.

  Next, a detailed configuration of the identification unit 41 will be described. An output of the A / D converter 30 is connected to an input of an adder 44 that calculates sum data of a specific section, and an output thereof is connected to one input of a comparator 45. The other input of the comparator 45 is connected to the output of the memory 46 in which feature data for identifying the banknote 1 is stored.

  The output of the A / D converter 30 is connected to one input of the comparator 47 in order to compare data at a predetermined specific position of the banknote 1, and the output of the memory 46 is connected to the other input. It is connected. The output of the comparator 45, the output of the comparator 47, and the output of the memory 46 are all connected to the input of the discriminator 48 that discriminates the authenticity and denomination of the bill 1 respectively. The output of the discriminator 48 is connected to the output terminal 42. The output of the control unit 35 is connected to the control inputs of the adder 44 and the comparators 45 and 47. Here, the dotted line 43 is composed of a microcomputer.

  About the banknote identification device comprised as mentioned above, the operation | movement is demonstrated below. The banknote 1 inserted from the insertion port 22 is transported on the passage 23 by the transport means 24. During the conveyance of the banknote 1, the graphic data of the banknote 1 is converted into an electrical signal by the optical sensor 27.

  The light emitting diodes 25a, 25b, and 25c constituting the optical sensor 27 are sequentially turned on by a control signal from the control unit 35. In this way, data from the beginning to the end of the banknote 1 is collected in the light receiving transistor 26. In the present embodiment, each data is obtained by dividing the banknote 1 from the start end to the end thereof into about 200 at equal intervals.

  For example, as illustrated in FIG. 2, when the line 1 a of the banknote 1 is sequentially irradiated by the light emitting diode 25, the output signal illustrated in FIG. 3 is obtained from the light receiving transistor 26. In FIG. 3, the horizontal axis 51 is time, and the vertical axis 52 is output level. 53 is signal data output from the light receiving transistor 26 when the light emitting diode 25a emitting infrared light emits light, and 54 is output from the light receiving transistor 26 when the light emitting diode 25b emitting red light emits light. Signal data. Reference numeral 55 denotes signal data output from the light receiving transistor 26 when the light emitting diode 25c emitting blue light emits light.

  Thus, when the banknote 1 is transported by the transport means 24, a characteristic signal corresponding to the figure of the banknote 1 is output from the light receiving transistor 26. The output signal shown in FIG. 3 is actually the output of the A / D converter 30, but is described as the output of the light receiving transistor 26 for the sake of simplicity. This is because the output of the light receiving transistor 26 and the output of the A / D converter 30 correspond to each other.

  A signal obtained from the banknote 1 is converted into an electric signal by the light receiving transistor 26, and this electric signal is amplified by the logarithmic amplifier 28 and the linear amplifier 29 and then converted into digital data by the A / D converter 30.

  From this digital data, the authenticity and denomination of the banknote 1 are discriminated from the characteristics of the banknote 1 at a plurality of specific positions determined in advance in the comparator 47 and the characteristics of the sum data of the specific section in the adder 44. In other words, in the past, the determination was made based only on the feature at the specific position by the comparator 47, but in this embodiment, in addition to the feature based on the specific position, the bill 1 is identified using the sum data of the specific section. Yes. Therefore, by using the sum data, noise (noise of the banknote 1, noise in the optical system, electrical system) and positional deviation of the banknote 1 (deviation due to printing of the banknote 1, etc., slippage between the conveying means 24 and the banknote 1). Since errors due to (unevenness of conveyance) and the like can be smoothed, identification with high accuracy is possible.

  In the identification using the sum data, there are one using sum density and one using sum color difference. In the present embodiment, details of discrimination based on sum density of the banknote 1 will be described. In FIG. 4, first, a predetermined specific section 56 is set in a signal from the beginning to the end of the banknote 1. In the present embodiment, 20 specific sections 56 are set in each place of the banknote 1.

  In this specific section 56, 53a is the maximum value obtained by averaging the top three of the signal data 53 output from the light receiving transistor 26 that has received light emitted from the light emitting diode 25a that emits infrared light. 54a is a maximum value obtained by averaging the top three signal signals 54 output from the light receiving transistor 26 that has received light emitted from the light emitting diode 25b that emits red light within the specific section 56. Reference numeral 55a denotes a maximum value obtained by averaging the top three of the signal data 55 output from the light receiving transistor 26 that receives light emitted from the light emitting diode 25c that emits blue light within the specific section 56. Each of these maximum values is obtained by the adder 44.

  Thus, since each maximum value 53a, 54a, 55a uses the average of the top three levels, it can be smoothed even if there is noise or misalignment, and identification with high accuracy is possible. .

  Using each maximum value obtained in this way, as shown in FIG. 4 and (Table 1), the adder 44 calculates the sum and shade of the banknote 1 as follows. That is, the sum density 57 due to infrared light is obtained as the total value of the difference between the maximum value 53a and the signal data 53b output from the light receiving transistor 26 due to light emission of the light emitting diode 25a during the specific section 56. The sum density 58 due to red light is obtained as the sum of the differences between the maximum value 54 a and the signal data 54 b output from the light receiving transistor 26 due to the light emission of the light emitting diode 25 b during the specific section 56. Similarly, the sum density 59 due to blue light is obtained as the total value of the difference between the maximum value 55a and the signal data 55b output from the light receiving transistor 26 due to light emission of the light emitting diode 25c during the specific section 56.

  In this way, since each sum density 57, 58, 59 calculates a difference from the maximum value, even if the ambient temperature changes, the maximum values 53a, 54a, 55a and the difference between them also change in the same way. Therefore, it is possible to correct the temperature change.

  The sums and shades 57, 58, 59 obtained in this way by the adder 44 are output to the discriminator 48. The discriminator 48 discriminates whether or not the data of the sums and shades 57, 58 and 59 are within the range of the genuine coins stored in the memory 46.

  That is, the discriminator 48 calls the maximum value and minimum value data of the true coin stored in the memory 46, and whether the data of the sum density 57, 58, 59 is within the range of the maximum value and the minimum value. It is determined by. Banknotes 1 within this range are determined as true coins, and banknotes outside this range are determined as false coins.

  In addition, the banknote 1 in this embodiment is identified by the output of the A / D converter 30 at approximately 200 specific positions of the banknote 1 in addition to the sums and shades 57, 58 and 59, and the memory. Compare with a predetermined value stored in 46. Then, the comparator 47 compares whether or not the comparison value is within a predetermined range of genuine coins, and the comparison output at a specific position in the comparator 47 is also compared with the authenticity and denomination of the bill 1. Is discriminated by the discriminator 48. In this way, the discriminator 48 discriminates and the authenticity and denomination of the banknote 1 are output from the output terminal 42.

  The discrimination of the true coin is determined as the true coin only when both the sum data of the specific section and the data at the specific position are determined as the true coin. In this way, the reliability of discrimination is increased.

  Thus, since the banknote 1 is identified based on the data of the sum density in the specific area 56 other than the data of the specific position of the banknote 1, even if there exists noise etc., the data are averaged. Therefore, it is possible to obtain a banknote identification device with few erroneous recognitions.

  Further, since the optical sensor 27 is used as the sensor, a gap can be provided between the optical sensor 27 and the banknote 1. Therefore, the banknote 1 is not clogged in the passage 23 and can be smoothly conveyed.

(Embodiment 2)
The second embodiment uses a sum color difference as identification using sum data, and will be described below with reference to FIG. In addition, about the same thing as Embodiment 1, the same code | symbol is attached | subjected and description is simplified.

  In the second embodiment, only the identification unit 61 is different from the identification unit 41 of the first embodiment. In other words, the output of the A / D converter 30 is connected to the input of the adder 64 that calculates the sum data of the specific section, and the output is connected to one input of the comparator 65. Further, the other input of the comparator 65 is connected to the output of the memory 66 in which feature data for identifying the banknote 1 is stored.

  Further, the output of the A / D converter 30 is connected to one input of the comparator 67 for comparing data at a predetermined specific position of the banknote 1 and the output of the memory 66 is connected to the other input. It is connected. The output of the comparator 65, the output of the comparator 67, and the output of the memory 66 are all connected to the input of the discriminator 68 that discriminates the authenticity and denomination of the bill 1 respectively. The output of the discriminator 68 is connected to the output terminal 42. The output of the control unit 35 is connected to control inputs of the adder 64 and the comparators 65 and 67, respectively.

  About the banknote identification device comprised as mentioned above, operation | movement of the identification part 61 is demonstrated below.

  The digital data output from the A / D converter 30 is based on the characteristics of the banknote 1 in a plurality of specific positions determined in advance in the comparator 67 and the characteristics of the sum data of the specific section in the adder 64. Authenticity and denomination are discriminated. That is, in the past, the determination was made only by the feature at the specific position by the comparator 67, but the present embodiment is also the same as the first embodiment, and in addition to the feature by the specific position, the data of the sum of the specific section Is used to identify the banknote 1. Therefore, by using the sum data, noise (noise of the banknote 1, noise in the optical system, electrical system) and positional deviation of the banknote 1 (deviation due to printing of the banknote 1, etc., slippage between the conveying means 24 and the banknote 1). Since errors due to (unevenness of conveyance) and the like can be smoothed, identification with high accuracy is possible.

  In the identification using the sum data, in the present embodiment, details of the discrimination of the banknote 1 by the sum color difference will be described. In FIG. 6, first, a predetermined specific section 76 is set in a signal from the beginning to the end of the banknote 1. In the present embodiment, 20 specific sections 76 are provided in each place of the banknote 1.

  Within this specific section 76, 73a is the top 5 except for the five data at the beginning and end of banknote 1 among the signal data 73b output from the light receiving transistor 26 that has received light emitted from the light emitting diode 25a that emits infrared light. This is the maximum value obtained by averaging the pieces. 74a is the upper five of the signal data 74b output from the light receiving transistor 26 that has received light emitted from the light emitting diode 25b that emits red light, excluding the five data at the beginning and end of the bill 1 within the specific section 76. It is the average maximum value. In addition, 75a is the upper 5 except for the five data at the start and end of the banknote 1 in the signal data 75b output from the light receiving transistor 26 that has received light emitted from the light emitting diode 25c that emits blue light within the specific section 76. This is the maximum value obtained by averaging the pieces. These maximum values are obtained by the adder 64.

  Thus, since each maximum value 73a, 74a, 75a uses the average of the top five levels, it can be smoothed even if there is noise or misalignment, and identification with high accuracy is possible. .

  Using each maximum value thus obtained, as shown in FIG. 6 and (Table 2), the adder 64 calculates the sum color difference of the banknote 1 as follows.

  First, the total value 77 of the difference between the maximum value 73a and the signal data 73b output from the light receiving transistor 26 due to light emission of the light emitting diode 25a during the specific section 76 is obtained. Next, a total value 78 of the difference between the maximum value 74a and the signal data 74b output from the light receiving transistor 26 due to light emission of the light emitting diode 25b during the specific section 76 is obtained. Similarly, the total value 79 of the difference between the maximum value 75a and the signal data 75b output from the light receiving transistor 26 due to light emission of the light emitting diode 25c during the specific section 76 is obtained.

  Based on the total values 77, 78, and 79 thus determined, the red / infrared sum color difference 80 is determined by dividing the total value 78 by the total value 77 and multiplying it by 100. The blue / infrared sum color difference 81 is obtained by dividing the total value 79 by the total value 77 and multiplying it by 100. Similarly, the red / blue sum color difference 82 is obtained by dividing the total value 78 by the total value 79 and multiplying it by 100.

  For this reason, even if the ambient temperature changes, both the maximum value 73a and the signal data 73b change by the same amount, so the total value 77 of the difference between the maximum value 73a and the signal data 73b is not affected by the temperature. Similarly, since the maximum value 74a and the signal data 74b change by the same amount, the total value 78 is not affected by the temperature. Similarly, the maximum value 75a and the signal data 75b both change by the same amount with respect to the total value 79 and are not affected by the temperature.

  Furthermore, the sum color difference 80 is not affected by the temperature because the sum 78 is divided by the sum 77. Similarly, since the total value 79 is divided by the total value 77, the sum color difference 81 is not affected by the temperature. Similarly, since the sum value 78 is divided by the sum value 79, the sum color difference 82 is not affected by the temperature.

  The sum color differences 80, 81, and 82 obtained by the adder 64 are output to the discriminator 68. The discriminator 68 discriminates whether or not the sum color differences 80, 81, 82 are within the range of the genuine coins stored in the memory 66.

  That is, the discriminator 68 calls the maximum value and minimum value data of the true coin stored in the memory 66, and determines whether there is a sum color difference 80, 81, 82 within the range of the maximum value and the minimum value. Judging. Banknotes 1 within this range are determined as true coins, and banknotes outside this range are determined as false coins.

  The discrimination of the true coin is determined as the true coin only when both the sum data of the specific section and the data at the specific position are determined as the true coin. In this way, the reliability of discrimination is increased.

  Further, the banknote 1 in the present embodiment is identified by the output of the A / D converter 30 at approximately 200 specific positions of the banknote 1 in addition to the sum color difference 80, 81, 82 and the memory. Compare with the predetermined value stored in 66. Then, the comparator 67 compares whether or not the comparison value is within a predetermined range, and the authenticity and denomination of the banknote 1 are also discriminated together with the comparison output at a specific position in the comparator 67. 68. In this way, the discriminator 68 discriminates and the authenticity and denomination of the banknote 1 are output from the output terminal 42.

  Thus, since the banknote 1 is identified based on the data of the sum color differences 80, 81, and 82 in the specific section 76 in addition to the data on the specific position of the banknote 1, even if there is noise or the like, Data will be averaged, and a banknote recognition apparatus with few misrecognitions can be obtained.

(Embodiment 3)
In the third embodiment, the bill 1 is identified using both the sums and shades 57, 58, 59 described in the first embodiment and the sum color differences 80, 81, 82 described in the second embodiment.

  That is, as shown in FIG. 7, only the identification unit 91 is different from the first and second embodiments. In the third embodiment, 94 is an adder, and this adder 94 corresponds to the adders 44 and 66 in the first and second embodiments, respectively. Reference numerals 95 and 97 denote comparators, which correspond to the comparators 45 and 47 and the comparators 65 and 67 in the first and second embodiments, respectively.

  Reference numeral 96 denotes a memory, which corresponds to the memories 46 and 66 in the first and second embodiments, respectively. Reference numeral 98 denotes a discriminator. The discriminator 98 corresponds to the discriminators 48 and 68 in the first and second embodiments.

  In the above configuration, the comparator 97 has the same function as the comparators 47 and 67 of the first and second embodiments. Therefore, the comparator 97 compares data at a specific position of the banknote 1.

  Further, the adder 94, the comparator 95, the memory 96, and the discriminator 98 are used to obtain the sum and shades 57, 58, 59 described in the first and second embodiments and the sum color differences 80, 81, 82 together.

  The discriminator 98 discriminates the authenticity and denomination of the banknote 1 based on the data of the specific position of the banknote 1, the sum density 57, 58, 59 and the sum color difference 80, 81, 82. Therefore, the discrimination accuracy is higher than those in the first and second embodiments.

  Since the banknote identification device of the present invention can identify banknotes with high accuracy, it can be used in a vending machine or the like.

The block diagram of the banknote identification device in Embodiment 1 of this invention. The top view of the banknote identified with the banknote identification device Same as above, characteristic diagram of signal output from optical sensor Same part characteristic chart The block diagram of the banknote identification apparatus in Embodiment 2 same as the above Same part characteristic chart The block diagram of the banknote identification device in Embodiment 3 Block diagram of a conventional banknote recognition device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bill 22 Insertion slot 23 Passage 24 Conveying means 25a Light emitting diode 25b Light emitting diode 25c Light emitting diode 26 Light receiving transistor 27 Optical sensor 28 Logarithmic amplifier 29 Linear amplifier 30 A / D converter 41 Identification part 42 Output terminal 44 Adder 45 Comparator 46 Memory 47 Comparator 48 Discriminator

Claims (1)

An insertion port into which a bill is inserted, a passage connected to the insertion port, transport means provided in the passage, an optical sensor provided on a wall surface of the passage, and an output of the optical sensor An amplifier, an A / D converter connected to the output of the amplifier, an identification unit connected to the output of the A / D converter, and an output terminal connected to the output of the identification unit, The identification unit is a banknote identification device that identifies the banknote based on the data of the specific position of the banknote output from the A / D converter and the data of the sum of the specific section, and the sum of the specific section For the data, the sum of the difference between the maximum value obtained by averaging the top several data of the specific section and the data of each of the specific sections, or a plurality of optical sensors having different emission wavelengths. Provided to the first optical sensor Sum data of the difference between the maximum value obtained by averaging the top few data excluding the front and back edges of the banknotes and the data of the specific section, and before and after the banknotes of all data by the second optical sensor A bill discriminating apparatus using at least one of the sum color difference data of the specific section, which is a ratio of the sum of the difference between the maximum value obtained by averaging the top numbers excluding the fraction and the data of the specific section .

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