JPS59226986A - Damage discrimination system for sheet papers - 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 method for determining damage to paper sheets, for example, in which the degree of damage such as soiling or scratches on banknotes is determined chemically.

[Technical background of the invention and its problems]

Conventionally, this type of damage determination method detects the reflected or transmitted light of banknotes (two irradiated lights and adds them over all detected values), and the damage is determined based on the magnitude of the added value. There are things that do this. However, with this conventional damage determination method, if a banknote has irregularities due to the shading of printing, it is determined that there is little damage (even if the banknote has little damage).
Since the 1j car is dense, the overall integral value becomes small, resulting in erroneous discrimination. In other words, banknotes (2nd day notification 1
] If there is unevenness, it will be affected by the unevenness), and it will not be possible to accurately determine the damage.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to avoid being affected by paper sheets even if there are parts such as printing unevenness on paper sheets that affect the discrimination. The object of the present invention is to provide a method for determining damage to filter paper sheets, which can always accurately determine damage.

[Summary of the invention]

The method for determining damage to paper sheets according to the present invention is to selectively provide a paper sheet detection range at any position within the entire paper sheet, obtain an integral value for that portion, and determine the degree of damage based on this integral value. This allows for accurate damage determination at all times.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a detection section according to the present invention. That is, P is a banknote, which is conveyed in the direction of the illustrated arrow by a conveyor belt (not shown). The surface of the banknote P being conveyed is irradiated with light from a light source 1 via an optical system 2, and the reflected light is guided via an optical system 3 to a plurality of photoelectric conversion elements 41 to 4m, each of which is photoelectrically converted. It is supposed to be done. In addition, the back surface of the banknote P is illuminated via the photoacoustic optical system 6 from the light source 5, and the reflected light is guided to a plurality of photoelectric conversion elements 8. to 8m via the optical system 7' (i: Each of the photoelectric conversion elements 41 to 4rt is configured to perform photoelectric conversion.
l+81 to 8m are arranged linearly in a direction orthogonal to the conveying direction of banknotes P, respectively.

FIG. 2 shows the photoelectric conversion element 4. ~4m.

This figure shows a determination circuit that determines the degree of damage to banknotes P based on output signals of 8 and 8 m. That is, the photoelectric conversion element 4 on the front side. ~4m output signals F1 to Fm are respectively supplied to the integrating section 9. The integrating section 9 receives table detection range information from a control section (not shown) and calculates output signals Fa to Fb (F, ≦Fa≦Fb≦Fm) corresponding to the detection range among the output signals F1 to Fm. ... is selected, and the calculation section 1 integrates each of the signals.
Send to 0. The calculation unit 10 accumulates each integral value of the signal p B −F b output from the unit 9 and sends the accumulated value KFi to the addition unit 11 .

In addition, each output signal B of the photoelectric conversion elements 81 to 8m on the back side,
.about.Bm also passes through the integrating section 12 and calculating section 13 similar to those on the front side described above, and is sent to the adding section 1 as the cumulative value KQ. The addition section 11 calculates the sum of the cumulative values KF and KB by adding [:KF+KB], and sends the addition result S to the comparison and determination section 14. In the comparison and discrimination section 14,
Reference value H preset in reference value setting section 15
and the addition result S are compared. And as a result of that comparison,
If the addition result S is thicker than or equal to the reference value H (S≧
H) is determined to be a normal banknote, and if the addition result S is smaller than the reference value H (S<H), the banknote is determined to be damaged.

In the above explanation, F is used as a signal within the detection range.
It is expressed as a-Fb (Ba=Bb), and the detection range is one place, but it can be expressed as Fa-Fb, Fc- as necessary.
Fd, -=(Ba-Bb, Bl:~Bd,...
・), and the detection range may be set to several locations.

In this case as well, the subsequent processing is the same.

With the above configuration, even if there are factors that can easily cause misjudgment, such as variations due to the density of printing on the banknote P:2, by selectively selecting the detection range, it is possible to avoid these effects. , it is possible to always perform accurate damage determination.

In addition, although the said Example demonstrated the case where the reflected light from a banknote was used, it can apply similarly to the case where transmitted light is used. Further, the present invention is not limited to the case where the application is applied to damage determination of banknotes, but is also applicable to damage determination of paper documents such as securities other than banknotes.

〔Effect of the invention〕

As described in detail above, according to the present invention, even if there are partial marks on paper sheets that affect the discrimination, such as uneven printing,
It is possible to provide a method for determining damage to paper sheets that can always accurately determine damage without being affected by this.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention; FIG. 1 is a block diagram of a detection section, and FIG. 2 is a block diagram of a discrimination circuit. P...Banknotes (paper sheets), 1,5...Light source, 4I~'
m 181~8rn...Photoelectric conversion element, 9.12.
. . . Integrating section, 10, 13°°・Calculating section, 11... Adding section, 14... Comparing and determining section, 15... Reference value setting section. Representative patent attorney Kensuke Chika (1 person) 1st r
! ! J 1-8m

Claims (1)

[Claims] A light source that illuminates the filter paper sheets being conveyed; and a plurality of light sources that are arranged linearly in a direction perpendicular to the conveyance direction of the paper sheets and that receive all of the reflected light or transmitted light from the paper sheets and convert it into an electrical signal. A photoelectric conversion element, an integration means for selecting all output signals from among the output signals of these photoelectric conversion elements and integrating each one, an accumulation means for accumulating each integral value obtained from the integration means, and the accumulation means. 1. A method for determining damage to paper sheets, comprising: determining means for determining the degree of damage to the paper sheets by comparing the cumulative value obtained from the above with a preset reference value.