JPH08180238A - Device for discriminating paper sheets - Google Patents

Abstract

PURPOSE: To make it possible to detect the same point without increasing the number of sensors and to prevent the variation of a data level due to the wrinkles or the like on the paper money by discriminating and judging the paper money by the sum of imput data to reflected light receiving elements arranged on the side of a light emitting element. CONSTITUTION: In a detection part 10 for deteting a paper sheet such as paper money carried along a carrying route, a light emitting element 11 and a light receiving element 12 are oppositely arranged with the carring route interposed and reflected light receiving elements 13, 14 are arranged in the front and back positions of the element 11 on the same side as the element 11. The element 11 and the lower side element 12 constitute a sensor for transmitted light and the elements 11, 13, 14 constitute a sensor for reflected light to detect the same point by these sensors. A control part finds out the sum of outputs obtained by the elements 13, 14 and detects a pattern based upon the sum data. Thereby, even when a paper sheet is in a waved state due to a fold or the like, the influence of variation in the data level due to the wave is not exerted and the generation of a shadow is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a paper sheet identifying apparatus, and in particular, it solves the problem of the conventional identification apparatus using an optical sensor, which is a reduction in the identification accuracy for paper sheets having folds or wrinkles. The present invention relates to a paper sheet identification device that can be used.

[0002]

2. Description of the Related Art Identification devices for identifying bills, paper types such as bills, authenticity, etc. are vending machines, currency exchange machines, etc.
It is used in various paper handling equipment. An optical identification device using an optical sensor is a letter formed on a paper sheet,
The identification determination is performed by reading print patterns such as pictures and patterns, and correlating or comparing the data concerning the read print patterns with the basic pattern data stored in advance. A method of reading transmitted light and reflected light patterns is often used in an identification determination device using an optical sensor, and the correlation or comparison of the transmitted and reflected patterns is performed. When reading data with an optical sensor, it is necessary to obtain detection data from one point by irradiating the same point on the paper sheet with detection light.

FIG. 3 (a) shows the arrangement of optical sensors in a conventional optical identification device. In this conventional system, a single light emitting element 1 is sandwiched by a paper sheet conveyance path. By arranging the light receiving element 2 to face each other and arranging another light receiving element 3 on the same side as the light emitting element 1,
The transmitted light and the reflected light are detected at the same time. Also in this case, the position where the detection light is transmitted through the sheet and the position where the detection light is reflected are at the same point. This identification device detects flat paper sheets or detects the same point on the same inclined surface even if the paper sheets have folds or undulations as shown in FIG. 3B. The light reflected by the paper surface is accurately received by the light receiving element 3, but as shown in (c), the light emitting element 1 and the light receiving element 3 are placed on different inclined surfaces with the apex S of the bent portion of the paper sheet sandwiched therebetween. When facing each other, the detection light emitted from the light emitting element 1 is blocked by the apex S and cannot enter the light receiving element 3, and the obtained data is likely to include a level fluctuation (kage). Had caused a decrease in reliability.

In order to prevent the fluctuation of the data level caused by the presence or absence of the flatness of the detected portion of the paper sheet, as shown in FIG. 4, the light detecting portion 5 based on the transmitted light, An identification device has been developed in which the position of the light detection unit 6 based on the reflected light is shifted in the transport direction. The light detection unit 6 based on the reflected light has the light emitting elements 8 and 9 arranged at the front and rear positions in the transport direction with the light receiving element 7 interposed therebetween. According to this detection method, level fluctuations of data due to ups and downs of banknotes are unlikely to occur, but it is difficult to collect data at the same point because detection is performed by each sensor at different positions, and since the number of sensors increases, It brought up costs.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and enables the detection of a wrinkle, a fold, etc. on a bill or the like as an object to be detected while enabling detection at the same point without increasing the number of sensors. It is an object of the present invention to provide a paper sheet identification device in which fluctuations in data level caused by them are less likely to occur even when there are undulations.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a paper sheet identifying apparatus for detecting the authenticity and type of a paper sheet based on transmitted light and reflected light. Each of the light emitting element and the light receiving element is arranged so as to face each other. Further, on the same side as the light emitting element, a light receiving element for receiving reflected light is arranged at a front and rear position of the light emitting element.
It is characterized in that the discrimination is made based on the sum of the data inputted by the two light receiving elements.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing the principle of an identification device according to an embodiment of the present invention. The identification device 10 detects a paper sheet (object to be detected) such as banknotes conveyed along a conveyance path. The detection unit 10 arranges the light emitting element 11 on the upper side and the lower light receiving element 12 on the lower side with the conveyance path sandwiched therebetween, and further, in the front and rear positions of the light emitting element 11, respectively. First and second upper light-receiving element 1
The configuration in which 3, 14 are arranged is characteristic. In this embodiment, the light emitting element 11 and the lower light receiving element 12 form a sensor using transmitted light, and the light emitting element 11 and the light receiving elements 13 and 14 form a sensor using reflected light. The detection points of these sensors are the same.

When the paper sheet P is conveyed in a flat state as shown in FIG. 2 (a), the light emitted from the light emitting element 11 and reflected on the paper surface is evenly distributed to both light receiving elements 13 and 14. While the light is received, when the paper sheet is in an up-and-down state due to folding or the like as shown in (b), it is irradiated to the light receiving element 13,
Although the light received by 14 is not uniform, the control unit of the identification device of the present invention takes the sum of the outputs obtained by the two light receiving elements 13 and 14, and performs the pattern detection based on the data of this sum. Therefore, the so-called lizard does not appear because it is not affected by the fluctuation of the data level due to the undulation.

Further, since the transmitted light and the reflected light both collect data at the same point, the accuracy and reliability of the identification device are improved, and only one light receiving element is added in terms of cost. It is advantageous. Furthermore, as shown in FIG. 2 (c), the apex S of the bent or curved paper sheet P is located between the light emitting element 11 and the other light receiving element 13 or 14. Even when the reflected light is not incident on one of the light receiving elements (the light receiving element 14 in the drawing), the reflected light is properly incident on the other light receiving element 13, so that there is no change in the data level.

[0010]

As described above, according to the present invention, a bill or the like as an object to be detected has undulations such as wrinkles and folds while enabling detection at the same point without increasing the number of sensors. Even in such a case, it is possible to prevent the occurrence of data level fluctuations due to them.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the principle of an identification device according to an embodiment of the present invention.

2 (a), (b) and (c) are diagrams for explaining a detection method according to the present invention.

3A, 3B and 3C are explanatory views of a conventional example.

FIG. 4 is an explanatory view of another conventional example.

[Explanation of symbols]

10 detector, 11 light emitting element, 12 light receiving element, 1
3, 14 Light receiving element,

Claims (1)

[Claims] 1. A paper sheet identification device for detecting the authenticity and type of a paper sheet based on transmitted light and reflected light, in which one light emitting element and one light receiving element face each other across a paper sheet conveyance path. Further, light-receiving elements for receiving reflected light are arranged on the same side as the light-emitting element at the front and rear positions of the light-emitting element, respectively, and based on the sum of the data input by the two light-receiving elements for receiving the reflected light. A paper sheet identification device characterized by being configured to perform identification determination.