JPS5856187A - Deciding method for paper or the like - Google Patents

Abstract

PURPOSE:To detect feature pattern positions on the top and reverse of paper, etc., even in case of abnormal print matching between the top and reverse, etc., by detecting the feature pattern positions simultaneously or independently, and finding the relative positions of the specific patterns. CONSTITUTION:Groups 2 and 3 of photodetectors P1-P7, and P1'-P7' are arranged accurately above and below paper 1, etc., at specified distance so that specific patterns on the top and reverse surfaces are detected simultaneously. When the paper 1, etc., is move in a transfer direction (a), solid lines 7 are output signals of detectors P1-P7 in case of a true ticket, and dotted lines 9 are output signals of the detectors P1'-P7' in case of a false ticket. Namely, this shows that detection signals of the number 5 of the true ticket and the number 6 of the false ticket on the reverse surfaces detected simultaneously with the top surfaces are different. Thus, the position relation between the detection signals of the top and reverse surfaces is detected, so true/false discrimination is performed accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for discriminating paper sheets, and particularly to a method for discriminating green leaves that have patterns on the front and back sides.

Conventionally, when determining a banknote or the like, for example, the presence or absence of magnetic ink has been used. However, the above method could not be used without using magnetic ink.

In addition, optical detection methods can distinguish paper sheets such as securities that do not use magnetic ink, but since the front and back sides are judged separately, it is possible to detect irregularities in the printing of front and back patterns. It was difficult to detect.

The present invention is intended to solve the above-mentioned problems, and its purpose is to detect the pattern positional relationship between the front and back sides of paper sheets, thereby making it possible to detect abnormality in printing on the front and back sides, which has been difficult to obtain in the past. The purpose of the present invention is to provide a highly accurate paper sheet discrimination method.

The feature of the present invention is that it is a paper sheet discrimination method that has a highly accurate pattern position detection process, and the turn position of the features on the front and back of the paper sheet can be detected simultaneously or separately. A paper leaf discrimination method is characterized in that paper sheets are discriminated by determining the relative position of the specific pattern through a feature detection step.

Hereinafter, the present invention will be explained in detail using the drawings.

Paper sheets, especially securities, are printed on both sides simultaneously using precision printing machines. This printing method provides printing accuracy several times higher than when printing on the front and back sides separately using a general printing machine.

The present invention is a paper industry discrimination method that utilizes the high printing accuracy of the front and back sides.

FIG. 1(a) is a block diagram of the first implementation method of the present invention. A detector consisting of photodetectors P1 to P7 and P1' to P7/with high position detection resolution above and below oh' Groups 2.3 are arranged at a constant distance. The photodetector groups 2 and 3 are arranged at accurate positions where the front and back specific patterns can be detected simultaneously. FIG. 1 (b>) shows the output signal of the detector h2.3 when the paper sheet 1 moves in the transfer direction a.

The solid line is, for example, the output signal of the detector pl-P when the note is a genuine note, and the dotted line is the output signal of the detector pl/~P7' when the note is a counterfeit note. The detection signal from the front side of both genuine and counterfeit bills is the same, that is, the number "1" is on the detector P41 and P+5.
4 is detected, a signal 7 is displayed.

However, the detection numbers f and j of the number "1" 5 of the genuine note detected at the same time as the front face and the number @1" 6 of the counterfeit note are different. The detection signal 8 of the genuine note is detected at the detection point P5 The counterfeit bill detection signal 9 is output to the detector p between times t2 and t3.In the conventional method, only the signal pattern on the front side and the signal pattern on the back side are output. When U= is used separately, the waveforms of the genuine bill detection signal and the counterfeit bill detection signal, for example, are exactly the same, so it is difficult to determine the placement. Since the invention detects the position 1g of the front and back detection signals, it is possible to completely discriminate between authenticity and falsity. Fig. 2 shows the detection circuit of the first embodiment of the invention. The outputs of the detectors P4sP5 are into the inputs 11 and 12 of the circuit 10, and its output 1
3 and the output of detector PI37 and input 15 of i14.
．． Put each into 16.・Output 17 of AND circuit 14
enters the first input 19 of the decision circuit 18. memory 20
The output 21 of is connected to the second human power 22 of the determination circuit 18 . The output 23 of the determination circuit 18 is output as a determination signal.

The output of detector P4 + "5 is 0.1.l for both genuine and false notes.
.

Since it is a ship of 1.0, the output of the AND circuit lO is also O9l,
1.1.0. Back side detector F, / output &
Since genuine notes are 0, 1, 1, 0.0, AND circuit 1
The output 17 of 4 becomes 0, 111*Oe O. This output enters the determination circuit 18 and is compared with data previously stored in the memory 20, and if they match, a match signal is output. In the case of a counterfeit note, the outputs of the detectors P and I are o, o, o, o, o, and the inputs of the judgment circuit are o, o, o, o, o, and the judgment result is false. becomes.

FIG. 3 shows another detection circuit of the first embodiment of the present invention. The difference from the detection circuit shown in FIG. 2 is that the detector P1
~P6 and PII-P〒' are both located in the AND circuits 24, 25, and 26 to 32, and 33 to 39.

In the detection circuit shown in FIG. 2, even if each number is 1"5.
Although only the portion 6 is detected, the detection circuit shown in FIG. 3 also detects scratches, stains, etc., for example. That is, inputs 26-28, 31-36, 38°39 are all negative logic inputs, AND circuit 24G, human input 26-28, 31
．． Only when 32 is 01 human power 30° and 31 is 1, 1 is output to the output 40.

Similarly, the AND circuit 25 inputs 33 to 36.38°39
is 01 and the output 41 is 1 only when the human power 37 is 1.

When the detection circuit shown in FIG. 3 is used in the embodiment shown in Ml) and when the detection circuit shown in FIG. 2 is used, the same signal is output from the AND circuit 17 in the case of a genuine bill. In the first embodiment of the present invention shown in FIG. 18, the detectors are sequentially arranged on the X-axis side and paper sheets are transferred in the y-axis direction, but the present invention can also be practiced in the opposite case. It is.

FIG. 4 shows a second embodiment of the invention. A banknote 42, for example a 10,000 yen bill 42, is moved in the direction of the arrow and the sensor 44,
45, the external dimension of 1 g of the green part G and the outermost dimension of the brown part are respectively detected on the front and back sides.

The detection results for the front and back sides are compared relatively.

FIG. 5 shows a third embodiment of the invention. The coordinates (a*b) in the X-axis and y-axis directions of the center of symmetry 48 of the pattern 47 on the back side of a banknote, such as a 10,000 yen bill 46, are determined. Similarly, the coordinates (b, v) of the center of symmetry 50 of the pattern 49 on the surface are determined. It is determined whether the note is genuine or counterfeit based on the coincidence of the two central coordinates. For example, the difference in the center position of Itf notation is 10 to 2
If it is within 0 μm, it is considered a genuine note. If the pattern is a 10,000 yen bill, the front side may be a parlor, a multicolored pattern around the center, and the back side may be a phoenix, a circle around the character "1oooo", or the outer periphery. The printed patterns on banknotes are generally printed symmetrically within the paper surface, and the printed patterns on the front and back sides are formed with relatively high position precision, so the center of symmetry of the symmetrical pattern is at the center of the paper surface. By determining whether the banknotes are genuine or not, it is possible to determine whether the banknotes are genuine or false.

FIG. 6 is an embodiment of the IIS+ of the present invention. The scanning beams 52 and 53 of the radar 57 are transmitted from the front and back of the test banknote, for example, the 10,000 yen bill 51, using a hologram sensor or a rotary sensor 455,
56 is generated and scanned, and the distance relation as between the outer part and the real seal opening with respect to the entire length of the banknote.

Measure be, ct, clt. From the positions of the clothes and the registered seal determined by the scanning, it is determined whether the bill is a 10,000 yen bill or white based on the relative positional relationship between the clothes and the seal opening. This method is not limited to the 10,000 yen bill, but also the 111 yen bill.
It is also possible to identify 1i bills.

FIG. 7 shows a fifth embodiment of the invention. Sensors 60 and 61 are placed at positions equivalent to the similar patterns 58 and 59 printed on the front and back of banknotes, and when the banknote is moved in the vertical direction, the ratio of the passing time of each similar pattern is constant. The printing position shift between the front and back printing patterns is detected depending on whether it is in time or in white.

FIG. 8 shows the output signal of the sensor 60, 61. The output 60-1 of the sensor 60 outputs a peak value of 62.63 when the similar pattern 58 is detected. In addition, the output 61-1 of the sensor 61 outputs the peak value 64.65 when the similar pattern 59 is detected. The time of 0 peak value 62.63 is jl, and the intermediate time from the start to the peak @62, 63 is tl, similarly. If the time at which the peak value is 64.65 is +2, and the intermediate time from the start to the peak value 64.65 is t2, then from the similarity relationship, if it is a genuine note, the value ft# will be a value that satisfies the +11 formula.

Here, a is a constant within a certain range.

Furthermore, the intermediate time tl from the start to the peak value.

If they are arranged so that t2 are equal, if the notes are genuine, a value is obtained by adding rA to equation (2).

Here, b is a certain constant 〇(+1), (When formula 21 is satisfied at the same time, the test paper is judged to be a genuine note.

In the second to fifth embodiments of the present invention, detection can also be performed using a configuration similar to that of the determination circuit 18 and memo IJ 20 shown in FIG.

FIG. 9 shows its configuration. The outputs 68 and 69 of the front sensor group 66° and the back sensor group 67 are the first outputs of the signal processing circuit 70.
The second person's cuff fits 1.72 inches each. Signal processing circuit 7
The output cuff 3 of 0 is connected to the first input 19 of the determination circuit 18 . A second input 22 of the determination circuit 18 includes a memory 20.
The output 21 of is connected. The characteristic signals obtained by the front sensor part 66 and the back sensor part 67 are sent to the signal processing circuit 70.
to go into. The signal processing circuit 70 determines the relationship to be determined from the front and back signal relationships, for example, the relative relationship between the symmetry center position coordinates, and outputs it to the determination circuit 18 .

The determination circuit 18 compares the value with a true value range previously stored in the memory, and if the input value is within the range, outputs 23 as a genuine note.

The detailed explanation has been given above using the embodiments of the present invention.

According to the present invention, since the characteristic positional relationship between the front and back sides of a paper sheet is determined, the authenticity of precision printing, such as banknotes and securities, can be easily detected compared to conventional methods that separately recognized the front and back sides of a paper sheet. Is possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the processing method according to the first embodiment of the present invention. Figure 3 shows the detection circuit, Figures 4 to 7 explain the second to fifth processing methods of the present invention, Figure 8 shows the output waveform of the detector, and Figure 9 shows the configuration of the present invention. show. 2.66...Table sensor group 70...Signal processing (g circuit 18...Judgment circuit 20...Memory wait mtb=Large Fujitsu Ltd. Figure 4, Figure 5M

Claims (1)

[Scope of Claims] +11 In a method for identifying paper sheets that includes a highly accurate pattern position detection process, the identification is performed by a feature detection process that simultaneously or separately detects the positions of characteristic patterns existing on the front and back sides of the paper sheet. A paper sheet discrimination method characterized by discriminating paper sheets by determining the relative positions of patterns. (2) The paper sheet discrimination method according to claim 1, wherein the feature detection step detects the same location on the front and back patterns using reflected light or transmitted light. (3) The method for determining paper products according to claim 1, wherein the primary feature detection step detects the outermost position of a pattern printed on the front and back of the paper sheet. (4) The paper industry described in item 1 of the scope of the patent application, characterized in that the % fine detection step detects the center position and symmetry of the pattern printed on the front and back sides of the paper sheet with respect to the paper. Discrimination method. (5) The feature detection step includes detecting the outermost position of the paper sheet for each color.
Paper leaf identification method described in section. (6) The paper sheet discrimination method according to claim 1, wherein the feature detection step includes scanning light from both the front and back sides of the paper product simultaneously to detect pattern positions on both sides. . (7) In the feature detection step, a sensor is placed at a position equivalent to or similar to a similar pattern printed on paper sheets, and the paper industry or the sensor is moved to detect the passing of the similar pattern. 2. A paper sheet discrimination method according to claim 1, characterized in that time is detected. (8) The paper business type discrimination method according to any one of claims 1 to 7, wherein the paper business type is a banknote or a security.