JPH04157590A - Identification and discrimination device for paper money - Google Patents

Abstract

PURPOSE:To reduce the amount identification information and to shorten time required for discrimination by detecting positive or negative polarity at each reading point, comparing the inverted point with the information in a ROM and discriminating the kind of the paper money and truth from falsehood. CONSTITUTION:The identification data stored in a ROM 11 is the data indicating the position of an inflection point at each pattern reading point on the paper money. A CPU 12 discriminates the kind of the bill and truth from falsehood by comparing the inflection point at each reading point of the data concerning the pattern of the read paper money instead of recognizing the pattern on the surface of the paper money as values of varying density. Thus, troubles of increasing the amount of information and lengthening the discriminating time can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for determining the type and authenticity of banknotes used in automatic vending machines and the like.

(Prior Art) Devices equipped with a mechanism for accepting inserted banknotes, such as vending machines, money exchange machines, and cash deposit machines, are equipped with a device for identifying and determining the type, authenticity, etc. of a single banknote.

Banknotes are distinguished by having different patterns such as pictures, characters, colors, external dimensions, etc. from banknotes of other denominations, and identification devices such as vending machines are used to identify them in advance.
The characteristics such as different patterns for each denomination that you have memorized,
The type and authenticity are determined by comparing with the read pattern.

As an identification circuit used in an identification determination device, there is, for example, the one shown in FIG. and a switch 7 which inputs the read signal from the light receiving element 3 amplified by the amplifier 6 and becomes conductive under the control of a pulse output from a pulse generation circuit 14 (described later), and converts the signal outputted by the switch 7 into a digital signal. An A/D converter 8, a ROM 10 that stores identification information such as characters and patterns formed on the inserted banknote according to the type of banknote, and information obtained by reading the pattern of the banknote actually inserted. RAMLI that stores
A CPU that compares the information stored in RAM II with identification information stored in ROM10 to determine the type and authenticity.
12, and a predetermined pulse is output to switch 7.
It has a pulse generation circuit 14 that turns on and off.

The reading means 4 reads the state of the change in density of the pattern on the banknote P shown in FIG. 3 (at) based on the pulse timing of the clock shown in FIG. In the CPLI, it was compared with grayscale information for identification stored in ROM.As a result of the comparison, the read value was compared with the memorized information for identification and within a predetermined tolerance range (Fig. 3). fa)), it is possible to identify the type and determine authenticity.

However, in the above-mentioned conventional identification/determination device 17A, even if the banknote is genuine, it may be determined as a counterfeit if it has dirt on it. There is a risk that it may be misjudged as a true fist. Furthermore, there is a problem in that it takes time for operations to set the allowable error range and for maintenance.

Further, in the conventional data comparison method described above, since the shading of the pattern on the banknote itself is compared with the information in the ROM, there is a problem that the amount of information becomes large and the determination time becomes long.

(Object of the Invention) The present invention provides an identification determination device for banknotes, etc., which can eliminate the disadvantages of conventional banknote identification determination devices, such as an increase in the incidence of false judgments and a prolonged determination time. is intended to provide.

(Summary of the Invention) In order to achieve the above object, the present invention includes a reading timing pulse generating means that generates a pulse every time a banknote or the like passes a certain conveyance length, and a reading timing pulse generation means that generates a pattern of the banknote or the like in synchronization with the pulse. A reading means for optically reading, a ROM in which identification data regarding the pattern of the banknote, etc. is stored in advance, and the data regarding the pattern of the banknote, etc. read by the reading means is compared with the identification data in the ROM. In an identification determination device for banknotes, etc., comprising a CPU, the identification data stored in the ROM is data indicating inflection points at each reading point of a pattern on the banknote, and the CPU It is characterized in that the type and authenticity are determined by comparing the inflection point at each reading point of the data regarding the pattern, etc. with the identification data.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

Note that the circuit diagram shown in FIG. 2 is also referred to.

Fig. 1 fa) (bl is a diagram for explaining the type and authenticity determination procedure according to the present invention, and (al is a table showing the state of change in S-light of a pattern in the longitudinal direction of a banknote of a certain denomination. The reading means sequentially reads the density of a specific part on the banknote based on the data reading timing pulse indicated by tb+.

In the present invention, both the rising and falling points of the timing pulse of fb) are taken as reading points (indicated by numbers 1 to 10 at the bottom of Figure (b)), and the slope of each reading point on the waveform of fal, that is, the corresponding reading The positive or negative polarity of the slope is determined by comparing (for example, subtracting) the value with the previous value. As a result, the point where the polarity of the slope changes, that is, the point where the polarity changes from positive to negative or from negative to positive, is detected, and the position of that point (which may be considered as the phase) is detected. ) is compared with the data in the ROM to determine the type and authenticity of the banknote.

To determine the polarity, read the concentration value of each reading point 1 to 10 and compare the data of each adjacent reading point (for example, by subtraction)
This calculation is performed for each point to sequentially detect the polarity of the slope and detect the point of change. For example, if [density at reading point 2 (!] - [density value at reading point l 1×○], the polarity at reading point 2 is negative, and furthermore, [density at reading point 3 [ ] -
[Density value at reading point 2]〉0, then reading point 3
It is possible to obtain information that the polarity at is positive. By comparing the polarity of reading point 2 and the polarity of reading point 3, it can be determined that the polarity at reading point 3 is reversed from negative to positive.

If a banknote of denomination A has a reading point of 3.7.8.1o
The polarity is reversed, and the reading point is 2.5 for denomination B.
．． If the polarity is reversed at each point in 8.9.10, then after detecting the polarity of each reading point using the above method,
The point where the polarity is reversed is detected and compared with basic information regarding the point where the polarity is reversed stored in the ROM to identify and determine the type and authenticity.

In order to simplify the explanation, the number of read timing clock pulses is shown in a small number in FIG. 1, but in reality, control is performed using a relatively high frequency clock, so the inflection point can be detected relatively accurately. I can do it.

In other words, if the clock frequency is high, even if a position deviates from the actual inflection point of the temporary setting is read, the deviation is only one pulse of the clock, so when compared with the data stored in the ROM, If it is determined that the winding is true within the range of a deviation of one clock on this clock, no inconvenience will occur.

In addition, there are various other known means for detecting an inflection point, and any of these methods may be used.

In the above embodiments, the case was mainly shown in which the denomination and authenticity of banknotes were identified, but the present invention also applies to objects to be identified other than banknotes,
For example, it can be applied to coupons, etc.

(Effects of the Invention) As described above, the present invention does not capture the pattern on the banknote surface as the value of density change itself, but detects the positive and negative polarities at each reading point, and stores the point of reversal in the information in the ROM. Since the type and authenticity are determined by comparing with

[Brief explanation of the drawing]

FIG. 1 (at fb) is an explanatory diagram showing the type and authenticity determination procedure according to the present invention, in which (a) is a diagram showing changes in pattern shading in the longitudinal direction of a banknote of a certain denomination, and (b) ) is a diagram showing a data read timing pulse, FIG. 2 is an identification circuit diagram used in a conventional identification determination device, and FIG. 3 (b) is an explanatory diagram showing a conventional type and authenticity determination procedure. 1... Light emitting element 2... Light emitting circuit 3... Light receiving element 4... Reading means 6... Amplifier 10... RO
M 11...RAM 12...CPU 14
...Pulse generation circuit patent applicant Toyo Tsushinki Co., Ltd.

Claims (1)

[Claims] a reading timing pulse generating means for generating a pulse every time a banknote or the like passes a certain conveyance length; a reading means for optically reading the pattern of the banknote or the like in synchronization with the pulse; and a reading means for optically reading the pattern of the banknote or the like in synchronization with the pulse; RO with pre-stored data
M, and a CPU that compares data regarding the pattern of the banknote or the like read by the reading means with identification data in the ROM. The data is data indicating the position of the inflection point at each reading point of the pattern on the banknote,
The CPU determines the type and authenticity of banknotes by comparing inflection point positions at each reading point of the data regarding the pattern of the read banknotes with the identification data. .