JP2655169B2 - Banknote identification method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a bill discriminating method, and more particularly to a method of projecting a light beam on a bill surface and analyzing the reflected light to identify the authenticity of the bill. About.

(Prior Art) As a method for identifying bills in a vending machine for tickets or cards, there has been a method using a device having a magnetic sensor and an optical sensor.

When a bill is identified using this device, the width, length or thickness of the bill is read by a method of blocking or transmitting light using an optical sensor. At the same time, the characters and patterns on the banknote printed with the ink mixed with the magnetic material are read by a magnetic sensor, and the changes in the waveform position and output are compared with those of the genuine bill stored in advance, and Determine whether it is true or false.

(Problems to be Solved by the Invention) However, such a conventional identification method has the following problems. That is, the optical sensor identifies only the transparency of the banknote based on the amount of transmitted light, and the other magnetic sensor identifies only information from the magnetic material mixed in the ink of the banknote. If there is a variation in the mixed magnetic material, this information becomes unstable.

Therefore, the accuracy of conventional identification methods using magnetic sensors and optical sensors is low, and if the accuracy of judgment is increased and the swallowing rate of genuine bills is made strict, the swallowing rate will decrease and it will be used in vending machines. Very few bills. Conversely, if the determination accuracy is loosened, the swallow rate increases, but a counterfeit note is easily swallowed.

Furthermore, in the case of a method of judging the authenticity by transmitting light to the bill, a light projecting unit is installed on the upper side or the lower side of the bill,
A sensor for detecting the light transmitted through the bill must be arranged at a corresponding position on the other side. For this reason, it has not been possible to project and detect light from both the front and back of the bill.

An object of the present invention is to solve such a problem and to provide a method for reliably identifying banknotes by a simple method.

(Means for Solving the Problems) In order to achieve the above object, the intensity of the reflected light, which is obtained by projecting a light beam on a bill passing in front of the bill by a reflected light sensor configured in the bill validator body, is output. By comparing the width of change of the signal, that is, the difference between the maximum value and the minimum value of the output signal, with the width of change of the output signal of the genuine bill previously stored in the detection mechanism, reflection from the difference of this change width is performed. A bill discriminating method for discriminating a difference between a sensitivity pattern of a light sensor and a component of a printed pattern corresponding to the light sensor is configured.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings. 1 is a perspective view of the entire bill validator used in the present embodiment, FIG. 2 is a plan view of the bill validator excluding an upper cover, FIG. 3 is a cross-sectional side view taken along line III-III of FIG. FIG. 4 (A) is an output waveform diagram of a genuine bill stored in the detection mechanism, and FIG. 4 (B).
Is an example of an output waveform diagram of a counterfeit note.

Inside the bill validator 2 used in this embodiment, a reflected light sensor 9 and a detection mechanism 16 for analyzing information on bills obtained by the reflected light sensor 9 and a magnetic sensor 29 are configured.

The bill validator 2 is composed of an upper box 21 and a lower box 22. The first roller 30 and the second roller
32, a third roller 34 is provided, and a fourth roller 31, a fifth roller 33, and a sixth roller 35 are also provided on the upper box 21 so as to face the respective rollers of the lower box. The first to third rollers and the fourth to sixth rollers have a lower belt 41 and an upper belt, respectively.
42 have been passed over.

Further, one reflected light sensor 9 is arranged between the first roller 30 and the second roller 32 on the lower box 22 and between the fourth roller 31 and the fifth roller 33 of the upper box 21. The reflected light sensor 9 is installed at a central point of the bill so as to project the light beam. The number of the reflected light sensors 9 may be plural.

The detection mechanism 16 is installed in a part of the lower box 22, and the output waveform of the genuine bill obtained by the reflected light sensor 9 is stored as a digital signal in an IC-ROM or the like inside the detection mechanism 16.

At the same time, the output waveform of the reflected light obtained from the light receiving unit 9b is converted into a digital signal by the detection mechanism 16 and compared with the signal of the genuine bill,
The authenticity of the bill is determined by analyzing the difference between the signal amplitudes.

The magnetic sensors 29 are installed on both sides of the upper belt 42 of the upper box 21 and the lower belt 41 of the lower box 22, respectively. The magnetic sensor 29 detects a magnetic substance mixed in the printing ink on the surface of the bill P to identify the authenticity of the bill.

The operation of the present embodiment thus configured will be described below. When the bill P is inserted into the slot 6, the leading end of the bill P
It is wound around the roller 30 and the fourth roller 31. When the bill P is entangled and its end passes through the reflected light sensor 9,
A light beam is projected on the banknote P from the light projecting portion 9a.

Then, part of the light beam is reflected by the bill P,
Received at 9b. The received light beam is converted by the detection mechanism 16 into a digital signal. On the other hand, an IC-ROM or the like is installed in the detection mechanism of the detection mechanism 16 to store in advance a digital signal obtained from a genuine bill, and the magnitude of the amplitude of the stored genuine bill signal and The authenticity of the bill P is determined by comparing the amplitude of the signal of the inserted bill P with the magnitude of the amplitude of the signal and analyzing the difference.

That is, the printing ink for banknotes is a mixture of ten or more kinds of inks, and therefore, the glossiness of the ink is low and the reflectance is low.

On the other hand, although the ink used for normal printing may mix a plurality of inks, it does not mix many kinds of inks like the ink for banknote printing, and is the same as the printing ink for banknotes. Can not be mixed.

Therefore, there is a large difference in the reflectance between the banknote printing ink and the normal ink and the printing method thereof, and the difference in the reflectance appears not as a waveform pattern but as an amplitude.

In the present invention, the magnitude of the amplitude of the waveform (the magnitude of the reflectivity) is compared with that of a genuine bill stored in advance, and the magnitude of the amplitude is compared. This is remarkable as a difference between the amplitude width of the output waveform of the genuine note and the amplitude width of the output waveform of the counterfeit note, as shown in FIGS.

For this reason, it is easy to judge a genuine note and a counterfeit note, but if it is acceptable, it is treated as a genuine note, and if the amplitude width is unacceptable, it is treated as a counterfeit note. It is.

In this way, when the bill P is determined to be a fake bill, the bill P is returned to the slot 6, and when determined to be a genuine bill, it is swallowed as it is in the bill recognition device. In addition, since these determinations are made by measuring the reflected light from the bill instead of transmitting light to the bill as in the related art, the light beam projection on the bill can be performed on both sides of the bill simultaneously. Further, the position of the reflected light sensor on the upper side of the banknote and the position of the lower reflected light sensor may be arranged in correspondence with each other, or the upper and lower reflected light sensors may be arranged in non-corresponding positions. Is also good. Therefore, each reflection light sensor can be separately arranged on each of the front and back surfaces of the bill at the portion where the detection effect is highest.

Since the reflected light sensor used in the bill validator body according to the present invention is very small, it can be installed even in a very narrow portion between the rollers, and the reflected light sensor itself is inexpensive.

(Effects of the Invention) As described above, the use of the banknote identification method according to the present invention makes it possible to simultaneously and reliably identify banknotes from the front and back sides of the banknotes in a compact and simple manner, thereby reducing costs. This also has the effect of being cheaper than before.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the invention, FIG. 1 is a perspective view of the entire bill validator used in the present embodiment, FIG. 2 is a plan view of the bill validator without an upper cover, and FIG. FIG. 4A is an example of an output waveform diagram of a genuine note stored in the detection mechanism, and FIG. 4B is an example of an output waveform diagram of a counterfeit note. 2 ... Banknote recognition machine, 9 ... Reflected light sensor, 16 ... Detection mechanism, 21 ... Upper box, 22 ... Lower box, 41 ... Lower belt, 42 ... Upper belt, P ... Banknote

Claims (2)

(57) [Claims] 1. A reflected light sensor formed in a bill validator main body converts the intensity of reflected light, which is obtained by projecting a light beam onto a bill passing in front of the bill, into a signal. The difference between the minimum value and the minimum value is compared with the width of change of the genuine bill output signal stored in the detection mechanism in advance. A bill discriminating method for discriminating a difference between constituent components. 2. The method according to claim 1, wherein an arbitrary measurement position is selected for each of the front and back sides of the bill, and the front and back sides of the bill are simultaneously measured regardless of the measurement position.