JPS60117390A - Sheet paper discrimination - 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 Technical Field of the Invention The present invention relates to a paper sheet discrimination method in a banknote discrimination device or the like.

Background of Technology Recently, automatic machines such as automatic deposit machines and automatic teller machines have come into use to save labor in bank counter operations. Automatic machines that handle such banknotes are equipped with a banknote discrimination device to determine the denomination of the banknotes. The banknote discrimination device uses an optical sensor in addition to a magnetic sensor to discriminate between paper sheets.

PRIOR ART AND PROBLEMS FIG. 1 is a diagram for explaining the main parts of an apparatus for identifying paper sheets such as banknotes. Reference numerals 1 and 2 indicate guide plates for a conveyance path; 3.
4 is a conveyance roller, 5 is a light source, 6 is a light receiver, and 7 is a paper sheet.

In such a conventional identification device, when the paper sheet 7 is transported, the paper sheet 7 is moved vertically between the guide plates 1 and 2 between the transport roller 3 and the next transport roller 4. Therefore, the distance t between the paper sheet 7 and the light receiver 6 changes, which causes the output of the light receiver 6 to fluctuate as shown in Figure 2, reducing its discrimination ability. There were drawbacks.

Purpose of the Invention In view of the above-mentioned conventional drawbacks, the present invention provides a paper sheet discrimination device using an optical sensor, which compensates for fluctuations in the output of the optical sensor due to downward movement in the conveyance path of paper sheets, and improves the discrimination ability. This is achieved by providing a method for discriminating paper sheets.

Structure of the Invention According to the present invention, in a paper sheet discrimination method that determines the type of paper sheet based on a detection pattern signal from an optical system that detects the pattern of paper sheets, This is achieved by providing a method for discriminating paper sheets, which is characterized by detecting the same points of paper sheets from the front and back surfaces using two sets of transmission type separators.

Example 1 of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a diagram for explaining the first embodiment of the paper sheet discrimination method of the present invention. In the figure, 10.11 is a guide plate for conveying paper sheets, 12.13 is a conveyance roller, 1
4 and 15 are light sources, 16 and 17 are light receivers, and 18 is a paper sheet.

As shown in FIG. 3, this embodiment includes a transmission type optical sensor consisting of a light source 14 and a light receiver 16, and a light source 15 and a light receiver 17.
Two sets of transmission type optical sensors consisting of
8 identical points can be detected from the front and back sides, the outputs of the two sets of optical sensors are added, and the type of paper sheet is discriminated based on the value.

The sensor output of this embodiment configured in this way is as shown in FIG. In the figure, curve A is the output of the light receiver 16,
Curve B is the output of the light receiver 17.

Then, when paper sheets pass through the center a of the upper and lower guide plates on the conveyance path, the outputs of both are equal, and the value is vo, and the paper leaves the center of the guide plates and passes through b. Let v, , v, respectively, be v, then v.
, +v, and 2vo, and the two sensor outputs due to the vertical movement of the paper sheet compensate each other and become a constant value.

Figure 5 shows an example of the discrimination circuit, in which the outputs from the photoreceivers 16 and 17 are each amplified by amplifiers 30 and 31, and added by an adder circuit 32 (3). The signal is A/D converted by the converter 33, and then the type is discriminated by the type determining circuit 34.

FIG. 6 is a diagram for explaining the second embodiment. In the same figure, 10 and 11 are guide plates, ]2゜13 is a conveyance roller, 14 and 15 are light sources, and l 6 * 17 is a 18 is a paper sheet, and 19.20 is a half mirror.

In this embodiment, as shown in FIG. 6, a light source 14, a half mirror
19, a reflective optical sensor such as a light receiver 16, a light source 14,
A transmissive optical sensor consisting of a half mirror 20 and a light receiver 17; a reflective optical sensor consisting of a light source 15, a half mirror 20, and a light receiver 17; a light source 15, a half mirror 19, and a light receiver 1;
Constructing 4 sets of 6 types of transmission type optical sensors,
Two sets (transmissive type and reflective type) are provided on the front side and the back side of the paper sheet 18 conveyed between the guide plates 10 and 11, and arranged so that the same point on the paper sheet 18 can be detected once. , light source 1
4. Turn on 15 alternately, -' side receiver 16 or 17
A correction output is obtained by adding the difference value between the transmission pattern outputs of both light receivers 16° (4) and 17 to the reflection pattern output of the two light receivers, and paper sheets are discriminated based on this correction output. For example, the reflection pattern output of the light receiver 16 when the light source 14 is turned on is S, the transmission pattern output of the ζ light receiver 17 is S'1, and the light receiver 1 when the light source 15 is turned on.
Correction output S when the transmission pattern output of 6 is S/,
is S = S, 10k(8', -8',) (where k is a proportionality coefficient). This i has been corrected for the output fluctuation due to the vertical movement of the paper sheet in the reflection pattern s1. By using this S as a signal for discriminating paper sheets, it is possible to correct output fluctuations due to vertical movement of paper sheets, thereby improving discrimination ability.

Effects of the Invention As explained in detail above, the paper sheet discrimination method of the present invention uses an optical sensor to detect output fluctuations of the optical sensor caused by vertical movement of the paper sheet from both the front and back sides of the paper sheet. This has a great effect in that the ability to discriminate can be improved by compensating for this.

[Brief explanation of drawings]

1 and 2 are diagrams for explaining a conventional method for discriminating paper sheets, and FIG. 3 and FIG. 4 are diagrams for explaining a first embodiment of a method for discriminating paper sheets according to the present invention. FIG. 5 is a block diagram of one example of the discrimination circuit, and FIG. 6 is a diagram for explaining a second embodiment. In the drawing, 10 and 11 are guide plates, 12 and 13 are conveyance rollers, 14 and 15 are light sources, 16 and 17 are light receivers, and 1
8 indicates paper sheets, and 19.20 indicates a half mirror. Patent Applicant Fujitsu Limited Patent Application Agent Akira Aoki Patent Attorney Kazuyuki Nishidate Patent Attorney Yukio Uchida Patent Attorney Akira Yamaguchi (7) Figure 1 Figure 2 11Ya,\ya+I+:! .

Claims (1)

[Claims] 1. In a paper sheet discrimination method that determines the type of paper sheet based on a detection pattern signal from an optical system that detects the pattern of the paper sheet, A paper sheet discrimination method characterized by detecting from the front and back sides using a mold sensor. 2. Claim 1, characterized in that the summed value of the outputs of the two sets of transmissive sensors is used to determine the type of paper sheet.
Paper sheet discrimination method described in Section 1. 3. The paper sheet discrimination method according to claim 1, wherein the output of the reflective sensor is corrected based on the output difference between the two sets of transmission sensors.