JPH04217092A - Device for discriminating true or fake of paper money - Google Patents

Abstract

PURPOSE:To improve the reliability and the accuracy by synthesizing the data from the surface and the reverse side of paper money by using a sensor of a transmission type using a near infrared ray, obtaining an output wave and comparing it with genuine data stored in advance. CONSTITUTION:As for a sensor 4 constituted of a light emitting element 2 and a light receiving element 3, that of a transmission type is used. In such a state, an image is generated by synthesizing each data from the surface and the reverse side of paper money 1, and compared with genuine data. The light emitting element of a sensor set is irradiated with a transmission light of a near infrared ray, and scanned by its transmission light from the upper face of the paper money 1 in which it is confirmed to come to a detection zone. The near infrared ray which is scanned along a detection zone and transmits through the paper money 1 is photodetected by the light receiving element 3, and prescribed comparison data in time series data of its obtained transmission near infrared ray is compared with the corresponing data stored by genuine paper money. Since composite data of both faces of the paper money are compared, reliability is improved greatly, and also, the manufacturing cost can be reduced and the discrimination time can also be shortened.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an apparatus for determining the authenticity of banknotes, and in particular to an apparatus for determining the authenticity of banknotes. This invention relates to an improvement of a device for determining the authenticity of a product.

0002

[Prior Art] Conventionally, in automatic vending machines, currency exchange machines, game machines, etc., during the insertion and conveyance path of banknotes, it is determined whether the inserted banknotes are genuine or not, and counterfeit banknotes are detected. A device is provided for reversing the conveying mechanism and ejecting the conveyor mechanism in the event of a failure.

[0003] The above-mentioned identification device is generally known to use a magnetic sensor to detect magnetic substances contained in the printing ink of banknotes and present in a unique distribution state. However, this magnetic detection method can easily bypass the sensor check with simple processing, and the time-series detection data from a certain detection zone will differ each time even if the same banknote is used. , the accuracy was unreliable.

[0004]Also, recently there is a method in which the printed pattern of the inserted banknote is processed as a kind of image and compared, but as the technology of copying machines has improved, even with this method sometimes mistakes are made in identification. There is.

[0005]

OBJECTS OF THE INVENTION The present invention has been made by focusing on the problems in the conventional technology described above, and provides means and methods for solving the problems, achieving higher identification accuracy, and deceiving the device. The purpose of the present invention is to provide an apparatus for determining authenticity of banknotes, which is impossible.

[0006]

[Means for Solving the Problems] In order to achieve this object, the banknote authenticity determination device according to the present invention uses a sensor composed of a light emitting element and a light receiving element, and collects various data from the banknote inserted and conveyed. In a device that determines the authenticity of an inserted banknote by detecting the data and comparing the obtained data with the data of genuine paper failure stored in advance,
The sensor is of a transmissive type, and the data on the front and back sides of the banknote are captured simultaneously in the detection zone, and the respective data from the front and back sides are combined to form an image, and the image is compared with the real data. It is a feature.

[0007]

[Operation] With the above-described structure, data on both sides of the banknote are simultaneously combined, thereby making it possible to identify the banknote with even higher accuracy. In addition, in dealing with counterfeit items using technologically advanced copying machines, since the data is not collected from only one side, unlike the method that collects data by reflecting light onto the banknote surface, it is difficult to pass counterfeit banknotes. becomes almost impossible. Furthermore, as in the case of reflective type, the surface,
Unlike storing separate data such as the back side and searching sequentially, the time required for discrimination can be greatly reduced.

[0008]

[Embodiment] Next, an example of implementing the present invention will be described with reference to the drawings. FIG. 1 is a block circuit diagram showing an apparatus for determining authenticity of banknotes according to the present invention, FIG. 2 is a diagram showing an output curve for a genuine paper, and FIG. 3 is a diagram showing an output curve for a magnetic copy.

[0009] In these figures, 1 indicates a banknote, and this banknote 1 is carried into the interior through an insertion slot by a group of general rollers (not shown), and is formed by a light emitting element 2 and a light receiving element 3. The sensor is set to pass at a constant speed between the set of sensors. A sensor 4 for detecting the position of the banknote 1 is arranged above the front of this sensor set,
It is detected that the inserted bill 1 has reached a predetermined position. This detection signal is input to the AD converter 5,
AD conversion is started at the input timing.

The light-emitting element 2 of the sensor set described above is irradiated with transmitted light of near infrared rays (600 nm to 1500 nm), and scans with the transmitted light from the upper surface of the banknote 1 that has been confirmed to have come into the detection zone. The near-infrared rays scanned along the detection zone and transmitted through the banknote 1 are transmitted to the above-mentioned light receiving element 3.
Certain comparison data in the time series data of the transmitted near-infrared rays received by the banknote are compared with corresponding data stored in the memory of the genuine banknote.

The data from this light receiving element 3 is input to an AD converter 5 and sampled at a predetermined sampling frequency synchronized with the running speed of the banknote 1.
The number of samples sampled by the converter 5 is counted by a counter 6. This output is sent to the ROM 7 and the determining means 8. The output from the sensor 4 is also connected to the counter 6, and counting is started at the same timing as the output from the sensor 4 is received.

[0012] The ROM 7 records genuine data for each denomination of genuine banknotes, but since a transmissive near-infrared sensor is used in the sensor set, the number of data is for each denomination. It will suffice to use one in two longitudinal directions. In addition to this, the components of the printing ink and the unevenness that occurs,
It is also possible to store data on the content of components that absorb near-infrared rays and perform further comparisons.

2 and 3 show the output curves from the light receiving element 3. FIG. 2 shows the case of a genuine banknote, and FIG. 3 shows the case of a magnetic copy. The vertical direction is the output voltage, and the horizontal direction is the output voltage. It shows the location. As can be seen from Figures 2 and 3, the component that absorbs near-infrared rays is larger in the magnetic copy, and the difference is noticeable at the positions where the content is high (a, b, c in the figure), and is about 0.1 volt. A difference will occur. Therefore, the data at the position where this difference occurs is selected and used as the above-mentioned genuine data.

Furthermore, the output of the counter 6 indicates the detection position of the corresponding detection data of the banknote 1 under inspection, and when this matches the address of the authentic data serving as a reference, the detection data, that is, the AD The output of the converter 5 and the corresponding address data of the ROM 7 are compared by the determining means 8. The determining means 8 is the counter 6 to R.
When an address value is entered into OM7, the same value is entered into counter 6 at the same time and the operation is started. The determining means 8 compares the genuine data and the output of the AD converter 5, and determines whether the difference is permissible. As a result, the banknote 1 will be sent into the device if it is within the permissible range, and if not, it will be ejected from the insertion slot.

[0015] In the above embodiment, the data is digitized for easy comparison by interposing the AD converter 5, but it is of course possible to directly compare the waveforms without being particular about this configuration. The various sensors can be integrated with the drive sensor (switch) of the mechanism present in the insertion slot of the banknote 1 to facilitate assembly.For data detection, the banknote 1 is moved, but the sensor set side is moved. It is also possible. Furthermore, accuracy can be increased by using a near-infrared transmissive sensor in combination with a color-specific sensor that distinguishes and judges color levels using natural light.

Furthermore, according to this embodiment, counterfeit banknotes produced by various printing techniques such as color copying as well as magnetic copying do not have any waveforms, and can be completely eliminated. In addition, counterfeiting by making double-sided copies is too time-consuming and the alignment cannot be performed accurately, so it is rejected in the same way as general magnetic copies. There will be a difference.

As described above, according to this embodiment, a transmission type detection sensor using near infrared rays is used to synthesize data on the front and back sides of a banknote to obtain a waveform, which is compared with genuine data. Since this method performs discrimination, there are no misjudgments compared to conventional devices, and the time required for discrimination is shortened, and it becomes impossible to counterfeit and create acceptable counterfeit banknotes.

[0018]

[Effects of the Invention] As described above, according to the banknote authenticity determination device according to the present invention, the data to be compared is composite data of both sides of a banknote, which is not available in the past, thereby eliminating the possibility of allowing counterfeit banknotes. Reliability is greatly improved as the results do not differ each time, and production costs can be reduced by reducing the amount of data needed to read authentic data and by integrating the sensor. Moreover, the time required for discrimination can also be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing a banknote authenticity determination device embodying the present invention.

FIG. 2 shows the output curve of genuine banknotes.

FIG. 3 is a diagram showing an output curve of magnetic copying.

[Explanation of symbols]

Claims (2)

[Claims] Claim 1: A sensor consisting of a light-emitting element and a light-receiving element is used to detect various data from the banknote being inserted and conveyed, and the obtained data is combined with pre-memorized genuine paper fault data. In a device that determines the authenticity of inserted banknotes by comparison, the sensor is of a transmission type, and data on the front and back sides of the banknote are simultaneously captured in a detection zone, and each data from the front and back sides is detected. A banknote authenticity determination device that combines images to form images and compares the images with genuine data. 2. The sensor according to claim 1, wherein the sensor is configured as an electronic component integrated with a drive switching sensor of a transport mechanism for inserted banknotes.
Authenticity determination device for banknotes.