JPS61294596A - Paper money identifier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a banknote identification device used in a banknote exchange machine, a vending machine, or the like.

(B) Conventional technology Conventionally, this type of banknote identification system (t) takes in a banknote with a conveyance device to determine whether it is genuine or not, and if it is genuine, the conveyance device is further rotated in the normal direction to take it in and store it. In this case, the transport device is configured to be reversed and returned.
It is shown in the publication No.-12693.

On the other hand, as a method for identifying the authenticity of banknotes, there is a method of scanning the banknote surface with a magnetic head and detecting magnetic substances contained in printing ink. As such a magnetic identification method, the waves of the detection signal from the magnetic head based on the turns are counted and the counted value is within a predetermined range. It identifies banknotes by determining whether they are present in the banknotes.

(C) Invention b' - Problems to be Solved In the conventional banknote identification device, a predetermined judgment value range for determining a genuine banknote is set to determine authenticity, but even if the banknote is genuine, In some cases, the banknote is determined to be a counterfeit banknote due to partial dirt on the banknote or a scanning error caused by a magnetic head and is returned, but even in this case, it is often accepted as a genuine banknote by reinserting the banknote. Such a phenomenon is likely to occur when the set value b'-5 for authenticity determination is high.It is not possible to lower the set value b-5 because it will reduce the identification accuracy, and this may cause distrust to the customer. was giving.

In view of the above points, the present invention provides a banknote identification device that can reduce the return rate of banknotes without reducing recognition accuracy.

B) Means for Solving the Problems The present invention provides a conveying means for taking in, conveying and returning banknotes inserted from an input slot, and generating a detection signal based on the printing pattern of the banknotes conveyed by the conveying means. magnetic detection means; compartment-side determination means for determining the authenticity of each predetermined section of the banknote based on the detection signal of the magnetic detection means; a determining means for determining whether the banknote is a banknote or a counterfeit banknote;
and a drive control means for driving and controlling the conveyance means according to the determination result of the determination means, and operates the drive control means according to the determination result of the determination means to return and convey the false banknotes by the conveyance means. The printing pattern of the counterfeit banknote is again determined to be genuine during transport, and when the banknote is determined to be a genuine banknote, the return transport is stopped and the banknote is taken in and transported.

(E) Function The present invention determines the authenticity of banknotes inserted from the input slot for each predetermined section, and determines whether the banknote is a genuine banknote or a counterfeit banknote based on the authenticity determination for each section. However, if it is determined that the banknote is a fake banknote, the authenticity is determined again while the banknote is being returned by the transport means, and if it is determined to be a genuine banknote in this determination, the return transport is stopped and the banknote is taken in and transported.

(f) Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention, in which (1) is a magnetic head that generates a detection signal based on the printing pattern of the banknote when a test banknote passes; (2) is a magnetic head that generates a detection signal. (3) is a detection circuit composed of a diode, (4) is a low-pass filter that detects the envelope signal from the detection signal, and (5) is a signal waveform of the low-pass filter that is sampled at a predetermined period. A/D to convert to digital value
It is a converter. (6) is a processing circuit as a section-side determination means that determines the authenticity of each predetermined section of the inspected banknote based on the output data of the A/D converter (5) and outputs a "true" signal or a "false" signal. It is equipped with RAM+71 and ROM (8). Further, (9) is a determining means that determines whether a banknote is "authentic" or "fake" based on each signal from the processing circuit (6), and if it is determined to be "authentic", it operates the drive circuit 1G as a drive control means. Then, the conveying means, which will be described later, is rotated in the normal direction (1), and when it is determined to be "false", the conveying means is reversely rotated. (ID is a pulse generator that outputs a pulse in response to the movement of the test banknote. In FIG. 2, the test banknote inserted from the input port α2 is moved by a transfer roller (13A) as a conveying means.
The bill passes through the magnetic head (1) while being held between a pair of belts αa stretched over the banknote (13B), and the pulse generator (11) outputs pulses in synchronization with the rotation of the roller α9 caused by the movement of this bill. is configured to do so.

In other words, slits α are arranged radially at equal intervals along the roller α.
61b: formed, optical sensor αηb = roller α9
As a result of the rotation of It has become. ■ is a division control circuit that divides the identification surface of the test banknote into n ways, and pulse generation a<
When the pulses from tt+ are counted and reach a predetermined value, timing signals T, -T, . . . T are output to the processing circuit (6).

With the above configuration, when a banknote is inserted from the input slot (17J) and the pair of belts 0.0 rotates forward to pick it up and convey it, the banknote passes through the magnetic head (1). (2) outputs the detection signal shown in Fig. 3.The detection signal is detected by the detection circuit (3), and then the envelope signal b'-detected by the low-pass filter (4) shown in Fig. 4. The A/D converter (5) samples the envelope signal and converts it into a digital value every time a pulse is introduced from the pulse generator αB, but the processing circuit (6) The data introduced from (5) is sequentially stored in the RAM (71).

By A/D converting the envelope signal in this way, the digital value also becomes large where the peak value of the detection signal is large.
Furthermore, where the peak value is small, the digital value is also small, making it possible to capture the characteristics of the amplitude of the detection signal. The division control circuit (a) counts the pulses generated in the pulse generator αD as the banknotes move, and outputs a timing signal T1 to the processing circuit (6) when a predetermined value is reached. Therefore, the processing circuit (6) compares the envelope signal data stored in the RAM (71) with the data indicating the case of genuine banknotes for that section, which is programmed in the ROM (8), and determines whether the envelope signal data is within the allowable range. If it matches the reference data, it is determined that this section of the banknote is genuine and a "true" signal is output to the determining means, and if it does not match, a "false" signal is output for this section to the determining means.

In this way, the processing circuit (6) determines whether each section is true or false and outputs a "true" or "false" signal to the determining means (9) each time. As shown in Fig. 5, this determination process for each section is based on the ratio a/b between the maximum peak value a and the width of the envelope signal.
) extracts the maximum data a from the envelope data sampled in one section stored in RAM (7), and also detects the number of envelope data having a value equal to or greater than a predetermined value [C] and compares the data. Calculate. Then, it is compared with the data showing the ratio for genuine banknotes for that section programmed in the ROM (8), and if the calculated ratio value IJt matches this standard data within the tolerance range, then this This is a method for determining whether a section is genuine.

On the other hand, the determining means (9) counts each time a "true" or "false" signal is input from the processing circuit (6), and when the sum of the count values of each signal reaches a predetermined number of sections n, " If the count value based on the "false" signal is "O", it is determined that the banknote is a genuine banknote, and the drive circuit a1 is operated to further rotate the pair of belts αa in the normal direction to take in and store the banknote. Further, if the count value by the "false" signal is "1" or more and within a predetermined setting value, it is determined that the bill is a counterfeit bill and the drive circuit QG is operated,
The pair of pels H4 are reversed and a reprocessing signal is output to the processing circuit (6). Based on the detection signal of the magnetic head (1) generated when the counterfeit bill is returned and conveyed by the reversal of the belt α, the counterfeit bill is detected. The processing circuit (6) repeats the authenticity determination operation for each section of the printed pattern from the opposite direction, and the processing circuit (6) outputs "true" and "false" signals for the number of sections n. Here, the determining means (9) c. If the count value based on the "false" signal is "O", the counterfeit banknote is determined to be a genuine banknote, and the drive circuit 00 is operated to stop the belt α bleeding from reversing. At the same time, the banknotes are rotated in the forward direction to capture, convey, and store the banknotes. If the banknote is determined to be a counterfeit banknote in this re-judgment, the banknote is returned to the input slot (13).In other words, the banknote determined to be a counterfeit banknote during normal rotation transport of the belt α4 is returned in the reverse direction by the belt α4. During conveyance, the printing pattern in the opposite direction is again determined by the determining means, and if the banknote is determined to be a genuine banknote, the return conveyance is stopped and the banknote is taken in, conveyed, and stored.

(G) Effects of the Invention In the present invention, the authenticity of the banknotes inserted through the slot is determined for each predetermined section, and based on the authenticity determination for each section, the banknotes are classified as either genuine banknotes or counterfeit banknotes. If the banknote is determined to be a counterfeit banknote, the authenticity is determined again while the banknote is being returned by the transport means, and if it is determined to be a genuine banknote in this determination, the return transport is stopped and the banknote is taken in and transported. Therefore, the return rate of banknotes can be lowered without lowering the identification accuracy. Therefore, the problem of the banknote being returned even though it is a genuine banknote is reduced, and the customer's sense of trust is improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment according to the present invention, Fig. 2 is a diagram showing the relationship between banknote conveyance and a pulse generator, Fig. 3 is a waveform diagram of a detection signal, and Fig. 4 is an envelope of the detection signal. The waveform diagram of the line signal in FIG. 5 is a diagram illustrating banknote discrimination in one section based on the envelope signal of that section. (1)...magnetic head, (6)...processing circuit,
(9)... Judgment means, (II... Drive circuit, ■
···belt.

Claims (1)

[Claims] 1. A conveyance means for taking in, conveying and returning banknotes inserted from an input slot, a magnetic detection means for generating a detection signal based on the printing pattern of the banknotes conveyed by the conveyance means, and a magnetic detection means for generating a detection signal based on the printing pattern of the banknotes conveyed by the conveyance means. a section-by-section determining means for determining the authenticity of the banknote for each predetermined section based on a detection signal; and a determination section for determining the banknote as a genuine banknote or a counterfeit banknote by the section-by-section determination of authenticity by the section-by-section determination means. and a drive control means for driving and controlling the conveyance means according to the determination result of the determination means, and operates the drive control means according to the determination of fake banknotes by the determination means to return and convey the fake banknotes by the conveyance means. A banknote identification device characterized in that during the return conveyance, the printed pattern of the counterfeit banknote is again determined to be true or false, and when the banknote is determined to be a genuine banknote, the return conveyance is stopped and the banknote is taken in and conveyed.