JPS6048587A - Discrimination of sheet paper - 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 fa) Technical Field of the Invention The present invention relates to a magnetic paper sheet discriminating device, and particularly to improving the discriminating ability of the device.

(Background of BL technology In recent years, automatic teller machines and vending machines have become more widespread, but these devices need to be able to automatically distinguish the denomination of banknotes as well as the authenticity. Discrimination methods in this type of equipment include those that use optical means and those that use magnetic means.

(C1 Prior Art and Problems) In the method using magnetic means, a pattern formed using magnetic ink on the surface of a banknote is detected by a magnetic head. According to such a configuration, when the magnetic pattern to be detected that is inclined with respect to the helad gap passes, Detection of the magnetic pattern (
The K signal has a low level and a waveform with a large temporal spread. As a result, the S/N ratio of the detection signal is lowered, the resolution thereof is lowered, and the ability to discriminate minute features of the magnetic pattern is lowered. That is,
There is a high probability that the feature points of the magnetic pattern will not be accurately extracted, and that a comparison between the detection signal data and the standard pattern data will be determined to be inconsistent. Furthermore, the above-mentioned phenomenon also occurs when banknotes, etc. are input into the discriminator in a direction such that the magnetic pattern is inclined with respect to the head gap, and the tolerance of the discriminator for handling 11L bills, etc. is affected. It was also the cause of the decline.

(d1 Purpose of the Invention The purpose of the present invention is to propose a detection method that has high resolution even for magnetic patterns that are not perpendicular to the trunk direction, thereby making it possible to provide a paper sheet discrimination device with high discrimination ability. do.

te+ Structure of the Invention The present invention provides a paper sheet discrimination method performed by detecting a magnetic pattern formed on the surface of paper sheets, in which a plurality of magnetic head gaps are arranged in different directions with respect to the trunk direction. The magnetic head is characterized in that it is arranged so as to be inclined, and includes a magnetic head having a plurality of integrated head gaps, each of which is inclined in a different direction with respect to the trunk direction.

Examples of ff1 invention Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram schematically showing the situation when a magnetic pattern having an inclination angle with respect to the head gap passes, and the head gap 2 is When the magnetic pattern 3 passes at an inclination angle δ with respect to the head gap 2 [FIG. 1 (A)], and when it passes at an inclination angle δ O [
(B)). These detection signal waveforms are shown below each figure, and when the slope angle is δ-0, a sharp detection signal is output. On the other hand, the inclination angle δ≠0
In the case of , the detection signal has a low wavefront value (as well as a wide half-value width), and the number of signals that can be separated and detected during a certain period of time [■ width decreases, and the discrimination ability decreases.

FIG. 2 shows a first embodiment of the present invention, in which three head gasops having different inclination angles θ with respect to the track direction are provided. That is, three hesodogyasop (respectively chi, C112, CuI2
) are placed on the same track, and
These head gaps may be collectively incorporated into one housing 4, as shown in FIG. In this case, as shown in the figure, a banknote or the like 1 on which a magnetic pattern is formed is pressed against the casing 4 from its back surface by a heald 5 having a width at least larger than the width of the head gap.

FIG. 4 shows a second embodiment of the present invention, in which the inclination angle with respect to the trunk direction (arrow) is +θ, o as in the previous embodiment.
Three head gaps of l-θ (C111, Ch2, c
h3) are placed on three different trunks (■, ■), and as in the previous embodiment, each head gap is collectively incorporated into one housing 6, as shown in FIG. It may be In this case, the banknotes, etc. 1 may be pressed against the housing 6 from the back side by using a bell l-5 similar to that in the above embodiment, or by a pressure roller rough having a width spanning at least all three tracks. good.

FIG. 6 shows the head gap Ch in each of the above embodiments.
Fig. 2 is a functional block diagram for processing detection signals detected by head gaps Chi, Ch2, and C10, in which the outputs from head gaps Chi, Ch2, and C10 are amplified by respective amplifiers 8, and filter circuits 9 remove sliding noise. After the components are removed, the signal is converted into a binary signal by the A/II conversion circuit 10 and stored in the memory (not shown) of the comparison circuit 11. Then, each channel (corresponding to head gaps C111, C++2, and C10) is compared with standard pattern data for each channel stored in the dictionary memory 12. The dictionary memo January 2 of each channel stores standard pattern data for each type of paper sheet to be discriminated, for example, each denomination, and these are sequentially searched and compared with the detection signal pattern, and all channels The test pattern is discriminated by selecting the denomination with the highest degree of agreement as the determination denomination.

In the above embodiment, an example is shown in which three head gaps with different inclination angles are provided, but it is also possible to have two or more head gaps, and generally speaking, the larger the number, the better. It becomes possible to separate and detect magnetic patterns with minute differences.

As explained above, in the discrimination method of the present invention,
Due to the provision of multiple gears and knobs tilted in multiple directions, even magnetic patterns formed on the surface of paper sheets etc. that are not perpendicular to the track direction can be detected with surface resolution. As a result, the discrimination ability of the discriminator can be improved. Furthermore, even if the direction in which paper sheets are fed into the discriminator is tilted, the detection signal of the head gap closest to this tilt is automatically selected, thereby reducing the tolerance to the operation of the discriminator. This becomes βJ ability.

(g1) Effects of the Invention According to the present invention, there is a paper sheet discriminating device that has high discrimination ability, high efficiency, and high tolerance.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the relationship between the head gap, the inclination angle of the magnetic pattern, and the discrimination ability in a paper sheet discrimination device, and FIGS. FIG. 2 is a diagram for explaining the arrangement of hemlocks and the configuration of a detection mechanism in a discrimination method, and a functional block diagram for performing discrimination processing. FIG. In the figure, 1 is paper 171? etc., 2 is the head gap,
3 is a magnetic pattern, 4 and 6 are housings, 5 is - root,
7 is a holding roller, 8 is an amplifier, 9 is a filter circuit, 1
0 is an A/D conversion circuit, 11 is a comparison circuit, and 12 is a dictionary memory. % 1 Figure (c) (13) Figure 2 Figure 4 Figure 6 Example

Claims (2)

[Claims] (1) In a paper sheet discrimination method performed by detecting a magnetic pattern formed on the surface of paper sheets, a plurality of magnetic held gaps are tilted in different directions with respect to the transport direction of paper sheets. A method for discriminating paper sheets characterized by arranging them in this manner. (2) A method for discriminating paper sheets according to claim 1, characterized in that a magnetic head having a plurality of head gaps tilted in different directions with respect to the paper sheet conveying force 1iiJ4 is provided. .