JPH0821103B2 - Paper discriminating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention uses a plurality of types of optical sensors having different wavelengths of light to be detected to detect the types of paper sheets such as banknotes and their damage (damage and damage). Or whether it is true or false).

<Prior Art> This type of paper sheet discriminating apparatus is provided with a plurality of conveying rollers 1 as means for conveying a paper sheet P at appropriate intervals as shown in the schematic configuration diagram of FIG. In order to scan both sides of the paper sheet P, detection units 2 and 3 are installed at two locations along the transport path.

Each of the detection units 2 and 3 includes a reflection type optical sensor 6 including a pair of a light emitting element 4 and a light receiving element 5 so that the entire area of both sides of the sheet P can be scanned. ), A plurality of them are arranged at appropriate intervals in a direction substantially perpendicular to. Moreover, as the optical sensor 6, in order to obtain the color information for printing on the paper sheet P by scanning with light of a plurality of wavelengths, a plurality of types of light having different wavelengths of light emitted and received are used.

Further, the detection units 2 and 3 are connected to a comparison / determination unit 7 as shown in the block diagram of FIG.

The output signal from each optical sensor 6 obtained by scanning the paper sheet P by carrying the paper sheet P by the carrying roller 1 is amplified by the amplifier 8 of the comparison / determination unit 7, and
After being converted into a digital signal by the A / D converter 9, the portion necessary for comparison and judgment from the digital signal is a data extractor.
It is extracted at 10 and used as detection data.

Next, as described above, the detection data obtained from the respective optical sensors 6 are collected and compared with the reference data stored in advance in the comparison / determination unit 11 in the comparison / determination unit 11 of the comparison / determination unit 7. As a result, it is possible to determine the type of paper sheet, whether it is normal or not, and whether it is true or false.

In the paper sheet discriminating apparatus as described above, conventionally, when two kinds of optical sensors 6 having different wavelengths, for example, a red light sensor and a green light sensor are used, the paper sheet is as shown in the schematic view of the main part of FIG. A red light sensor 6a is attached to the detection unit 2 which scans the upper surface of P.
In addition, a green light sensor 6b is provided in the detection unit 3 that scans the lower surface of the paper sheet P.
The type of the optical sensor 6 is divided for each of the detection units 2 and 3 such as by arranging.

<Problems to be Solved by the Invention> However, in the sensor arrangement as described above, when the printing on the paper sheet P is performed with the shade of a single color of red or green, detection on any surface is performed. Data extraction becomes difficult. For example, in the case of red-based printing, the intensity change of the output signal from the green light sensor 6b is large as shown in the waveform chart of FIG. 5 (a), but the intensity change of the output signal from the red light sensor 6a is , As shown in the waveform chart of FIG. 5 (b).

That is, in the conventional sheet discriminating apparatus, the detection data required for the discrimination is mainly from one side depending on the color tone of the printing on the sheet P, and thus the reliability of the discrimination is lowered accordingly.

<Means for Solving the Problem> That is, the present invention relates to a conveying unit that conveys a sheet, one detecting unit that is arranged on one surface side of the sheet that is conveyed by the conveying unit, and another sheet. A paper sheet discriminating apparatus including other detecting means arranged on the surface side and discriminating a paper sheet based on an output signal from each detecting means, and one detecting means and another detecting means, respectively. In addition, a plurality of types of optical sensors having different wavelengths of light to be detected are arranged in order along a direction substantially perpendicular to the transport direction of the paper sheet, and in one direction in the plurality of types of optical sensors of one detection unit The arrangement order is the same as the arrangement order along the other direction opposite to the one direction in the plurality of types of optical sensors of the other detection means.

<Operation> By arranging a plurality of types of optical sensors as described above, it is possible to scan the entire area of both sides of the paper sheet with light of each wavelength, and the reference data in one detection means and the reference data in another detection means. And can be shared.

<Embodiment> An embodiment of the present invention will be described below with reference to a schematic view of a main part of FIG. 1, a schematic configuration diagram of FIG. 2 and a block diagram of FIG. 2 and 3, the description in the conventional example will be referred to.

As shown in the figure, in the paper sheet discriminating apparatus of the present invention, the detection unit 2,
The arrangement of the three optical sensors 6 is characteristic.

That is, as shown in FIG. 1, the detection unit 2 for scanning the upper surface of the paper sheet P
And a detection unit 3 that scans the lower surface of the paper sheet P, and a plurality of types of optical sensors 6 that detect different wavelengths of light, respectively.
Moreover, each type is sequentially arranged in a direction substantially perpendicular to the paper sheet conveying direction (arrow a). For example, when two types of optical sensors 6 are used, a red light sensor 6a that emits and receives red light and a green light sensor 6b that emits and receives green light, each type of optical sensor 6a, 6b is It will be arranged alternately. Further, for example, when three types of optical sensors 6 having wavelengths of red, green and blue are used, they are arranged so that the same sequence as red, green, blue, red, green, blue ... Is repeated. In addition, each detector 2,3
The order of arrangement of the plurality of types of optical sensors 6 is the same when viewed from the respective surface sides of the paper sheet P.

Further, the number of the optical sensors 6 in each of the detection units 2 and 3 is such that, when arranged as described above, the optical sensors 6a and 6b of each type can scan the entire area of each surface of the paper sheet P, respectively. Is set to. That is, if the detectable range of each optical sensor 6 is wide, the number of each type can be reduced accordingly.

By disposing the optical sensor 6 as described above, it is possible to scan the entire area of both sides of the paper sheet P conveyed by the conveyance roller 1 with light of each wavelength, and the front and back sides of the paper sheet P are conveyed in reverse. However, it becomes possible to accurately detect light of each wavelength.

Then, the output signals from the respective optical sensors 6 are sent to the amplifiers 8 and A / A in the comparison / determination unit 7 shown in FIG.
It is sent to the data extractor 10 through the D converter 9 and used as detection data. Further, the comparison / determination unit 11 compares it with the reference data stored in advance in the comparison / determination unit 11. At that time, in the paper sheet discriminating apparatus having the above-mentioned configuration, even if the printing on the paper sheet P is performed by the shade of a red or green single color, the detection data can be obtained for the entire area of both sides of the paper sheet P. To be Therefore, based on the detection data for the entire area of both sides of the paper sheet P, the type of the paper sheet P, the damage, or the authenticity is determined. In addition, the arrangement order of the plurality of types of optical sensors 6 of the detection unit 2 along one direction (for example, from the top to the bottom on the paper surface of FIG. 1, the green optical sensor 6b, the red optical sensor 6a ... The order of the red light sensor 6a) and the arrangement order along the other direction (direction opposite to one direction) of the plurality of types of light sensors 6 of the detection unit 3 (for example, from bottom to top on the paper surface of FIG. 1). Green light sensor 6b, red light sensor 6a ... Green light sensor
6b, the order of the red light sensor 6a) is the same, and when both the front and back sides of the paper sheet P are to be detected by the respective detection units 2 and 3, they are stored in the comparison / determination unit 11. The same reference data can be used for both the detection units 2 and 3, and the storage capacity can be compressed.

In the above embodiment, the case where the reflection type optical sensor 6 in which the light from the light emitting element 4 is reflected by the paper sheet P and the reflected light is received by the light receiving element 5 is described. Even when a transmissive optical sensor that receives light is used, the same effect can be obtained by using the same arrangement. That is, as shown by the chain double-dashed line in FIG. 2, the transmission type optical sensor 6-
In the case of 1, the light emitting element 4-1 and the light receiving element 5-1 are located above and below the sheet P and face each other. A plurality of types of optical sensors 6-1 having different wavelengths of light to be detected are provided, and each type of optical sensor 6-1 is used in the sheet conveying direction (arrow B).
Are sequentially arranged in a direction substantially perpendicular to. Further, in the case of this transmission type optical sensor 6-1, since the color information of the printing on both sides of the paper sheet P can be obtained at the same time, the detection unit 12 may be provided at one place.

<Effects of the Invention> As described above, according to the paper sheet discriminating apparatus of the present invention, even if the printing on the paper sheet is performed by the dark and light of a single color, the entire surface of both sides is irrespective of the conveying direction of the paper sheet. The detection data is obtained, and the reliability of the discrimination of the type of paper sheet, damage, authenticity, etc. is improved. Further, when both the front and back sides of the paper sheet are to be detected by the respective detection means, the storage capacity of the reference data can be compressed.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a main part of an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a paper sheet discriminating apparatus, FIG. 3 is a block diagram of a comparison / determination unit, and FIG. 4 is a conventional example. 5A and 5B are waveform diagrams for explaining the drawbacks of the conventional example. 1 ... Conveyor rollers, 6,6-1 ... Optical sensor, 6a ... Red optical sensor, 6b ... Green optical sensor, P ... Paper sheet.

Claims (1)

[Claims] 1. A conveying means for conveying a paper sheet, one detecting means arranged on one surface side of the paper sheet conveyed by the conveying means, and another detecting means arranged on the other surface side of the paper sheet. In the paper sheet discriminating apparatus including means for discriminating the paper sheet based on an output signal from each detecting means, each of the one detecting means and the other detecting means is A plurality of types of optical sensors having different wavelengths are arranged in order along a direction substantially perpendicular to the transport direction of the paper sheet, and along one direction in the plurality of types of optical sensors of the one detection unit. A paper sheet discriminating apparatus wherein the arrangement order is the same as the arrangement order along the other direction opposite to the one direction in the plurality of types of optical sensors of the other detection means.