JPH01316892A - Paper money discriminating method - Google Patents

Abstract

PURPOSE:To surely discriminate paper money by a simple method by converting an output waveform of a reflected light to a signal by a detecting mechanism, comparing an output waveform signal with an output waveform signal of a true paper money stored in advance and analyzing a difference of magnitude of the amplitude of the waverform signals. CONSTITUTION:When a paper money P has been put into a throwing-in port 6, the tip part of the paper money P is rolled into a first roller 30 and a fourth roller 31. When the paper money P is rolled in and its end part passes through a reflected light sensor 9 part, the paper money P is irradiated with a light beam from a projecting part 9a. As a result, a part of the light beam is reflected by the paper money P, and received by a light receiving part 9b. The light beam which has been received is converted to a digital signal by a detecting mechanism 16. On the other hand, in a detecting mechanism of the detecting mechanism 16, an IC-ROM, etc., are installed and a digital signal obtained from a true paper money is stored in advance, and by comparing a size of width of amplitude of this signal of the stored true paper money, and a size of width of amplitude of the signal of the inserted paper money, P and analyzing its difference, whether the paper money P is true or false is decided.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a banknote identification method, and in particular, a method of projecting a light beam onto the surface of a banknote and analyzing the reflected light to identify the authenticity of the banknote. Regarding.

(Prior Art) As a method for identifying banknotes in ticket or card vending machines, there is a method using a device equipped with a magnetic sensor and an optical sensor.

When this device is used to identify banknotes, the width, length, or thickness of the banknote is read using an optical sensor that blocks or transmits light. At the same time, a magnetic sensor reads the characters and patterns on the banknote printed with ink mixed with magnetic material, and changes in the position and output of the waveform are compared with those of the genuine note stored in advance. Determine authenticity.

(Problems to be Solved by the Invention) However, such conventional identification methods have the following problems. In other words, the optical sensor only identifies the transparency of the banknote by the amount of light transmitted, and the other magnetic sensor,
Since only the information from the magnetic material mixed in the ink of banknotes is identified, if there is variation in the magnetic material mixed in the ink, this information becomes unstable.

Therefore, since the accuracy of conventional identification methods using magnetic sensors and optical sensors is unreliable, increasing the determination accuracy and tightening the swallowing rate of genuine notes will reduce the swallowing rate and make it possible to use it in vending machines. Banknotes become very scarce. On the other hand, if the determination accuracy is relaxed, the swallowing rate increases, but the problem arises that counterfeit bills are easily swallowed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for reliably identifying banknotes using a simple method that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention projects a light beam onto the inserted banknote to obtain reflected light using a reflective light sensor configured in the main body of the banknote validating machine. The output waveform is converted into a signal by a detection mechanism, and then this output waveform (a) is compared with an output waveform signal of a genuine note stored in advance in the detection mechanism, and a difference in amplitude of the waveform signal is analyzed. It has become.

(Example) Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view of a banknote identification device used in this embodiment;
Figure 2 is a plan view of the banknote validator with the top lid removed; Figure 3 is a cross-sectional side view taken along the line ■-■ in Figure 2; and Figure 4 (A) is the output waveform of a genuine bill stored in the detection mechanism. FIG. 4(B) is an example of an output waveform diagram of a counterfeit bill.

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

The bill validator 2 consists of an upper box 21 and a lower box 22.

From the banknote input slot 6 at the upper end of the lower box 22, the banknotes 10-3 are sequentially inserted.
0, install the 20th-ra 32 and the 30th-ra 34, and open the upper box 2
1 also the 40th to 31st rollers so as to face each roller of the lower box.
, 50th-La 33, and 60th-La 35 are installed. A lower belt 41 and an upper belt 42 are attached to the first to 30th la and the fourth to 60th la, respectively.

Furthermore, the 10th-ra 30 and the 20th-ra 32 on the lower box 22
between and the 40th-ra 31 and the 50th-ra 33 of the upper box 21
One reflected light sensor 9 is disposed between each of them. The reflected light sensor 9 is installed at a position where it can project its light beam at the center point of the banknote. Note that the number of reflected light sensors 9 may be plural.

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

At the same time, the output waveform of the reflected light obtained from the light receiving section 9b is digitalized by the detection mechanism 16 and compared with the signal of the genuine bill, and the authenticity of the bill is determined by analyzing the difference in signal amplitude.

The magnetic sensors 29 described above 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 the magnetic substance mixed in the printing ink on the surface of the paper 9WP to identify the authenticity of the banknote.

The operation of this embodiment configured in this way will be explained below.

When the banknote P is put into the slot 6, the tip of the banknote P will be at the 10th point.
It gets caught up in La 30 and 40th La 31. When the banknote P is rolled up and its end passes through the reflected light sensor 9,
A light beam is projected onto the banknote P from the light projecting section 9a.

Then, a part of the light beam is reflected by the banknote P.

The light is received by the light receiving section 9b. The received light beam is detected by the detection mechanism 1.
6, the signal is converted into a digital signal. On the other hand, the detection mechanism 16
The detection mechanism is equipped with an IC-ROM or the like to store the digital signal obtained from the genuine note in advance, and the amplitude width of the stored genuine note signal and the inserted banknote can be detected. The authenticity of the banknote P is determined by comparing the amplitude width of the signal P and analyzing the difference.

That is, the printing ink for banknotes is a mixture of ten or more types of ink, and therefore, the ink has low gloss and low reflectance.

On the other hand, although the ink used for normal printing may be a mixture of multiple inks, it is not the same as the ink for printing a single banknote, and the same ink as the printing ink for a banknote is used. Mixing is not possible.

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

The present invention compares the magnitude of the amplitude of this waveform (the magnitude of reflectance) with that of a genuine note stored in advance, and compares the width of the amplitude. As shown in FIGS. 4(A) and 4(E), the difference in the amplitude width of the output waveform of a genuine note and the output waveform of a counterfeit note is noticeable.

Therefore, it is easy to determine whether a genuine note or a counterfeit note exists; if it is acceptable, it is treated as a genuine note, and if the width of the amplitude is unacceptable, it is treated as a counterfeit note. It is.

In this way, if the banknote P is determined to be a counterfeit banknote, the banknote P is returned to the slot 6, and if it is determined to be a genuine banknote, the banknote P is swallowed into the banknote identification device as is. Note that the light beam may be projected on both sides of the banknote at the same time.

Either side is fine.

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

(Effects of the Invention) As explained above, by using the banknote identification method according to the present invention, it is possible to reliably identify banknotes in a small and simple manner, and the cost is also lower than conventional methods. It has the effect of

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, and FIG. 1 is a perspective view of the entire banknote recognition device used in this embodiment, FIG. 2 is a plan view of the banknote recognition device excluding the top cover, and FIG. Figure 2 III-
FIG. 4(A) is an example of an output waveform diagram of a genuine note stored in the detection mechanism, and FIG. 4(B) is an example of an output waveform diagram of a counterfeit note. 2...Paper I71\identifier, 9...Reflected light sensor.

Claims (1)

[Claims] A reflected light sensor configured in the main body of the bill validator projects a light beam onto the inserted bill to obtain reflected light, converts the output waveform of this reflected light into a signal by a detection mechanism, and then sends this output waveform signal to the detection mechanism in advance. A banknote identification method that identifies a banknote by comparing it with a stored output waveform signal of a genuine banknote and analyzing the difference in the amplitude of the waveform signal.