JPS5977588A - Paper money identification system - 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 There is a method for identifying banknotes that detects the magnetization of printing ink, and in this case, the following two methods are generally used.

One is to determine several check points, such as how many millimeters from the beginning there is a magnetic field, and determine the number of times an error occurs in these checks. One is that there is magnetic data from some distance from the beginning, and after that, the next magnetic field comes within a certain amount of time, and there is no magnetic field after the jump. It is used to determine changes in magnetism relative to the magnetic field.

However, these methods are simple in identifying counterfeit banknotes, imitation banknotes, altered banknotes, etc. (printing is not necessarily required).
They are easy to create and sometimes malfunction, so they are still insufficient for distinguishing between authenticity and authenticity.

Therefore, the present invention aims to improve these points, prevent crimes caused by counterfeit banknotes, imitation banknotes, altered banknotes, etc., and eliminate social anxiety, and also aims to prevent malfunctions. The specific part of the banknote is divided into multiple parts, and the state of magnetic distribution in the entire area is detected for each division, and the detection results of each division are appropriately aggregated into one, and compared with the standard value of each division. It is characterized by

The illustrated embodiment will be described below.

FIG. 1 shows the magnetic detection mode on a banknote. In the figure, A is a banknote, AI, A2 are magnetic detection lines in the longitudinal direction on the banknote, and 1 to 10 are magnetic detection lines in the banknote. The detection sections are equally spaced, and the banknotes are transferred in the longitudinal direction (to the left in the figure), and an identification device that detects magnetism and determines authenticity is associated with the magnetic detection lines AI and A2 for each detection section.

FIG. 2 shows a summary of the electronic circuit of the identification device, where 2j is a pattern sensor that detects the entire magnetic field in the magnetic detection line AI and A2, 22c is an analog signal from the pattern sensor ( B is a position sensor that detects the position of the transferred banknote, 24 C is a comparator 22
In response to the signals from the position sensor and the position sensor, the magnetic distribution state in the entire area within each detection division is individually summarized into numerical values, and compared with the standard value for each division. lJ1
The wholesale section 25 is a memory attached to the control section.

FIG. 3 shows I+IIIK in more detail of the one in FIG. 2, and in the figure, 31 is a magnetic sensor corresponding to the above-mentioned pattern sensor 2] K, 32Ii, 3 is an amplifier attached to the magnetic sensor, 33 is a comparator corresponding to the above-mentioned comparator 22; 36 is a division timing clock generator corresponding to the above-mentioned It controller 23; the others correspond to the above-mentioned control section 24 and memory 5;
:34 sampling circuits, 35 counters, memory, 4
0 digital comparator, 41 comparison level setting circuit, 43 search circuit, 44 comparison 11ilJ control section, 4
It consists of 5 standard pattern memories and a 4G clock generation circuit, or it can be made up of 42 arithmetic circuits attached to these.

The configuration shown in FIG. 3 will be explained in detail along with its operation.

The magnetic sensor 31 is arranged to detect magnetism in correspondence with the detection lines AI and A2, and is arranged to detect magnetism in accordance with the classification timing.
As shown in FIG. 4, the clock generator 36 includes a toothed disk 361 fixed to the shaft 52 of a drive motor 51 for transporting banknotes A, and a photo-interrupter 362 made to correspond to the toothed disk. The magnetic sensor 3j detects the magnetism of the paint from the moving banknote A and outputs it as an analog signal. , Amph. 32 This is moderately amplified and sent to the comparator 33, and the comparator converts the amplified analog signal into a predetermined square wave based on the comparison level and outputs the detection signal shown in Fig. 5g1. , Sampling circuit: Send to U4.

In addition to the detection signal, the sampling circuit 34 introduces a sampling pulse shown in @5 b1 from the clock generation circuit 46, and outputs a sample signal shown in FIG. 5 01 obtained by sampling the detection signal with the sampling pulse, Send it to counter 35.

On the other hand, the sorting timing clock generator 36 generates the sorting timing clock pulse shown in FIG. , the reset pulses shown in FIG. 5 e1 are generated for each detection section 1 to 10 in FIG. 1, and the reset pulses are sent to the counter 35.

The counter 35 counts the number of pulses of the sample signal for each detection section using the reset pulse, converts it into write data (sample data) shown in FIG. , send to 39. Note that the write data is temporally delayed from the sample signal by one period or more.

By the way, the above address signal 37V sends a division signal similar to the above reset pulse to the switching circuit (Fig.
Set an address for each of the 9 detection categories.

Further, the switching circuit is controlled by receiving the designation of the search address from the control section 14.

Therefore, the memory 39 distinguishes each detection category by setting the address by the switching circuit 38, stores the 1) included data, and then sends the read data based on the memory to the digital comparator 40. Sent le.

The digital comparator 40 also receives a reference comparison signal from the comparison level setting circuit 41 and compares whether the numerical value of the read data is above or below a certain value. In case II, a signal (sample pattern) is output as shown in FIG. 5g1 of Oll. Note that the determination signal is temporally delayed by one division or more from the write data.

If the comparison level setting circuit 41 outputs a comparison signal of a constant value, that is, if it is of a fixed type, the circuit is simple, and this is sufficient in terms of simplicity.

However, since there are some variations in the magnetic distribution of banknotes, in order to be completely sure, the comparison level setting circuit 41 is modified to Kanamachi, and an arithmetic circuit 42 is attached to it, and the read data is read out by the arithmetic circuit. All that is required is to add up all the classifications, take an average, and use this to sub-control the comparison level setting circuit 4 to obtain a comparison signal corresponding to the magnetic distribution of each banknote.

In this latter case, the discrimination signal is delayed in time from the write data by more than all sections.

The search comparison control section 44 has a manual operation section to artificially specify all addresses for each detection section of the memory 39, and also specify addresses corresponding to the standard pattern memory 15 detection sections. , and sends a predetermined write signal to the standard pattern memory for each address to be stored.

The standard pattern memory 45 stores 1""°0"' as shown in FIG.
Outputs the standard signal (standard pattern).

The standard signal and the discrimination signal are sent to the search circuit 43,
The search circuit compares the two, and when the discrimination signal matches or approximates the standard signal over the entire interval, it is u 1 u, otherwise it is 0'' as shown in FIG.
yields a search output of 1. Note that the search output is delayed in time from the discrimination signal by more than all categories.

Note that the portion corresponding to the control section 24 may be configured by a microcomputer. Further, sampling in each detection section is preferably performed several six times. Therefore, it is advisable to adapt the frequency of the sample signal and to adapt each circuit accordingly.

By the way, with the existing apparatus using the conventional method mentioned at the beginning, in the detection signal shown in FIG.
It should be noted that there may be cases where the

According to the present invention, a specific part of a banknote is divided into a plurality of parts. 1. The state of magnetic distribution of the gold area within each division is detected for each division. By comparing with the corresponding standard value, it is possible to quantify the magnetic distribution in units of area and area for each category, allowing for highly reliable identification, sufficient authentication, and detection of counterfeit banknotes, imitation banknotes, and falsified banknotes. Crimes involving banknotes, etc. can be prevented, social problems can be eliminated, and malfunctions can be prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram showing a banknote detection part, the second tooth is a summary block diagram showing the configuration of an electronic circuit, and FIG. 3 is a detailed diagram of the same. 4 is a trunk view showing the structure of the main parts, and FIG. 5 is a waveform diagram.

Claims (1)

[Claims] A specific part of a banknote is divided into multiple parts, and the state of magnetic distribution in the entire area is detected for each division, and the detection and results of each division are appropriately aggregated into one box, and the standard value of each division is calculated. A banknote identification method that is characterized by comparing with.