JPS6118087A - Pattern reader for sheet paper - 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 Field of the Invention The present invention relates to a pattern reading device for paper sheets, and more particularly to a device for reading printed patterns on paper sheets such as banknotes.

Description of Prior Art Conventionally, in △TM (Hematic Tellers Machine), etc., there is a bill reading device for reading the printed pattern of a bill in order to distinguish between authenticity and denomination of the bill.
Being ignored. As shown in FIG. 2, the conventional banknote reading device reads the printed pattern of a banknote in the same direction as the direction in which the banknote is conveyed, and the number of reading tracks is several. According to such a device, since only a small portion of the entire banknote area can be checked, it is impossible to detect a case where a banknote that has been tampered with, for example, a blank paper or the like is pasted on a portion other than the reading track.

OBJECTS OF THE INVENTION An object of the present invention is to provide a paper sheet pattern reading device that can check almost the entire area of paper sheets with a simple configuration.

Structure and Effects of the Invention In summary, the present invention comprises an optical pattern detector capable of covering the entire width of @A vegetable conveyance path, and a first pulse that generates a pulse corresponding to the conveyance speed of paper sheets. a second pulse generating means for generating pulses for sequentially scanning the photoelectric conversion elements of the optical pattern detector in synchronization with the pulses output from the first pulse generating means; A counter for incrementing the number of pulses output from the generating means, a starting edge detecting means for detecting the starting edge of one line of read signal output from the optical pattern detector, and detecting the ending edge of the read signal. and an up counter in which the count value of the counter is initially set in response to the output of the start edge detection unit, and thereafter the count value 11r4 is increased in response to the pulse output from the first pulse generation unit. a down counter whose h1 value is initialized in response to the output of the end detection means, and whose h1 value is subsequently decreased in response to the pulse output from the first pulse generation means; and an up counter. first coincidence detection means for detecting coincidence between the counting output of the counter and the counting output of the counter;
second coincidence detection means for detecting coincidence between the count output of the down counter and the count output of the counter; and a read signal of the optical pattern detector in response to the coincidence detection outputs of the first and second coincidence detection means. and means for reading the information.
With these configurations, the pattern of the paper sheet can be read along the diagonal lines of the paper sheet.

According to this invention, almost the entire area of the paper sheet can be checked without increasing the number of reading tracks, so that the following unique effects can be achieved.

(2) The storage capacity of paper sheet pattern data storage memory can be reduced.

■ The paper leaf authenticity discrimination program can be simplified. Moreover, this simplification can shorten the processing time for authenticity discrimination.

- By shortening the processing time for distinguishing between authenticity and falsehood, it is possible to shorten the conveyance path of paper sheets and increase the conveyance speed.

In the following, the present invention will be described in more detail with reference to the drawings and examples.

DESCRIPTION OF EMBODIMENTS First, in the present invention, as shown in FIG. 3, the pattern of paper sheets is read along diagonal lines of the paper sheets.

FIG. 4 is a mechanical diagram showing a schematic configuration of a banknote reading device according to an embodiment of the present invention. Moreover, FIG. 5 is a side view of the embodiment shown in FIG. 4, viewed from the direction of the arrow. Note that the optical pattern detector for detecting the pattern on the banknote may be of a light transmission type or a reflection type, but in this embodiment, a transmission type one will be explained. In the figure, an image sensor 1 as an example of an optical pattern detector has a configuration in which a plurality of photoelectric conversion elements are arranged in a line.

This image sensor 1 is arranged in a direction perpendicular to the direction in which banknotes 2 are transported, that is, along the width direction of the transport path 3.A light source 4 is arranged so as to face the image sensor 1 across the transport path 3. The image sensor 1 receives the light from the light R4 and outputs a reading signal.The image sensor 1 has a length corresponding to the length of the transport path so that it can read the entire width direction of the transport path 3. 3
It is formed longer than the width of. When the banknote 2, which has been conveyed along the conveyance path 3'' by the conveyor belt 5, is located between the image sensor 1 and the light source 4, the print pattern thereof is read by the image sensor 1. Roughly, it is conveyed to a subsequent stage by the conveyor belt 6. Note that a pulse encoder 7 is connected to a rotation shaft for rotating the first general feed bells 1 to 5. This pulse encoder 7 generates pulses with a period corresponding to the rotation speed of the conveyor belt 5, that is, the conveyance speed of the banknotes 2. This pulse is image sensor 1
It is used as a timing signal to control the reading operation of the .

Figure 1 shows the electric circuit portion of one embodiment of this invention.
It is a block diagram. In the figure, image sensor 4 "1"
The output of is given to amplifier 11 and amplified. amplifier 1
The output of 1 is given to a Δ/1] converter 12 to be converted into a digital signal, and is also given to a comparator 13.

A constant threshold voltage VO is given to the comparator 13, and the comparator 13 converts the amplifier 11 at this threshold voltage vO.
Discriminate the output of The output of comparator 13 is applied to flip-flops 15 and 16. Flipf [1 knob 1
5 is configured to be set in response to the rising edge of the output of the comparator 13 (1), and conversely, the flip 70 knob 16 is configured to be set in response to the falling edge of the output of the comparator 13. ing. The set outputs of knobs 15 and 16 of knob 70 are given to up counter 17 and down counter 18, respectively, as latch command signals. The up counter 17 and the down counter 18 are provided with the counting output of the counter 22, which latches this 8Iwl output in response to latch command signals from the Noritub flops 15 and 16. Further, the output pulses of the tit pulse encoder 7 are applied to the j' knob counter 17 and the town counter 18. The 7-up counter 17 is incremented by -1 in synchronization with this output pulse, and the down counter 18 is incremented by -1 in synchronization with this output pulse. Further, the output pulses of the pulse encoder 7 are applied to a flip-flop 19. The flip-flop 19 outputs the cell 1- in synchronization with the rising edge of the output pulse of the pulse encoder 7.
The configuration is as follows. and flip 70 knobs 1
The outputs of L 1 to 9 of 9 are applied to one input of the NO gate 20. An oscillator 21 is connected to the other input of the AND gate 20.
output pulses are given. The outputs of the AND games 1 to 20 are applied to the counter 22 as well as to the image sensor 1 and the A/D converter 12. counter 2
2 is a so-called ring counter whose count value returns to 0 when m pulses are divided by 1. Then, the signal 0 of the counter 22 is given to the flip 70 knob 19 as a reset signal. Further, the counting output of the counter 22 is given to the up counter 17 and the down counter 18 as described above, and the matching circuit 23 and J: and 2/
given to I. Furthermore, the count outputs of the up counter 17 and the down counter 18 are applied to the coincidence circuits 23 and 2/I, respectively. The matching circuit 23 is a circuit for detecting that the count output of the counter 22 and the count output of the up counter 17 match, and when it detects a match between the two count outputs, it derives a match detection output. On the other hand, the matching circuit 24 outputs the number of rows 22 and the town counter 1.
This is a circuit for detecting a match with the count number J of 8,
When a match between the number outputs of both eyes is detected, a match detection output is derived. The coincidence detection outputs derived from the coincidence circuits 23 and 24 are given to the reading circuit 14 as a pattern reading command signal. The reading circuit 14 is supplied with the output of the A/D converter 12, and reads the output of the A/D converter 12 in response to the coincidence detection outputs from the coincidence circuits 23 and 24.

The pattern information read by the reading circuit 14 is used in banknote authenticity discrimination processing, denomination discrimination processing, and the like.

FIG. 6 is a conceptual diagram showing the reading operation of the above-described embodiment.

Figure 7 is shown in Figure 1! ! It is a waveform diagram of the signal of each part of the i position. The operation of the above embodiment will be explained below with reference to FIGS. 6 and 7.

First, the pulse encoder 7 outputs a pulse as shown in FIG. , to NO goo 1 to 20
is opened, and the output pulse of the oscillator 21 is output to the counter 22.
given to. The counter 22 increments the number of pulses by 81, derives a carry signal when a predetermined number (m) of pulses is R1, and the count value returns to O. This carry signal is sent to the flip-flop 19 and the flip-flop 70
Reset knob 19. Therefore, AND gate 20 is closed. [Thus, the AND gate 20 outputs m pulses for each pulse of the pulse encoder 7 (see FIG. 7 (11) or (I)). The output of the AND gate 20 is applied to the image sensor 1 and the A/D converter 12. Image sensor 1
(The image sensor 1 is configured by arranging m photoelectric conversion elements in a row, and each photoelectric conversion element is scanned using the m pulses from the AND gate 20 as clock pulses. In other words, the image sensor 1 One line of pattern information is output with one pulse from the pulse encoder 7. Therefore, the image sensor 1 outputs one line of pattern information for each pulse of the output of the pulse encoder 7.

In FIG. 6, 81-+, 812. -8Lo indicates the reading line of the image sensor 11), and l-+
+l-2+...Ll, 1 indicates a dot line corresponding to each photoelectric conversion element. The intersection of this +3 reading line and the driver 1~ line becomes the reading point I~ read by the image [free 1]. In this embodiment, pattern information at the reading points P1 to P and SP, to SP, indicated by black circles, is sampled and used for processing for determining authenticity.

That is, only the reading points located approximately on the diagonal of the banknote 2 are adopted as pattern information.

Next, the operation for sampling the reading points will be described in detail. Now, assuming that the reading line of the image sensor 1 is SL, the output of the comparator 134 is amplified at a constant threshold of 16 V a (see Fig. 7(e)).
Discriminate. Therefore, the output of the comparator 13 is shown in FIG.
The waveform becomes as shown in f). The flip 70 knob 15 is activated in response to the rising edge of the output of the comparator 13,
The flip 70 block 16 is activated in response to the fall of the output of the comparator 13. That is, the flip-flop 70 knob 15 is connected to the cell 1 at the beginning of the reading signal of the banknote 2, and the flip-flop 16 is connected to the cell 1 to the cell 1 at the end of the reading signal of the banknote 2.
be done. Up counter 17 latches the count value of counter 22 in response to flip-flop 15 being set.

That is, the up counter 17 is initially set with a value of 1111 corresponding to the dot line [X] at one end of the banknote 2 between the dot lines L and -Lrn shown in FIG. The count value latched by the up counter 17 is given to the match circuit 23, but at this time, the same first count output from the counter 22 is sent to the match circuit 23. Therefore, the coincidence circuit 23 derives a coincidence detection output and supplies it to the reading circuit 14. In response to this coincidence detection output, the reading circuit 14 reads A
The pattern information currently being output from the /D converter 12 is read. At this time, since the image sensor 1 is reading the reading line 8m, the pattern information read by the reading circuit 14 becomes the pattern information of the reading point P1.

On the other hand, the down counter 18 latches the 11 value of the counter 22 in response to the setting of the flip-flop 16.

That is, the down counter 18 has the dot line 1. at the other end of the banknote 2. , y are initialized. The digit 46 latched in the down counter 18 is given to the match circuit 24, but at this time, the match circuit 24 is given the count output of the same value from the counter 22. Therefore, the coincidence circuit 24 derives a coincidence detection output and supplies it to the reading circuit 14. In response to this coincidence detection output, the reading circuit 14 reads the pattern information currently being output from the A/D converter 12. The pattern information read by the reading circuit 14 at this time is the pattern information of the reading point SP shown in FIG.

Thereafter, the up counter 17 is incremented by 1 for each read line by the output pulse from the pulse encoder 7. Further, the down counter 18 is decremented by 1 for each read line by the output pulse from the pulse encoder. In addition,
Up counter 17 and down counter 18 are configured to latch by 1 in response to the outputs of flip-flops 15 and 16 only on the first read line 51-4. As mentioned above, the up counter 17 is 1
Since it is 1-1 for each read line, the output number of the minus number circuit 23 is as shown in FIG. 7(0). In other words, -
The coincidence output from the numerical circuit 23 shifts by one dot line for each reading line. On the other hand, since the h1 value of the down counter 18 is decremented by 1 for each read line, the output of the minus number circuit 24 is as shown in FIG. 7(h). That is, the coincidence output from the minus number circuit 24 shifts by one dot line for each read line.

To summarize the above, the reading circuit 14 samples the reading points ~ as follows.

At reading line S L +...reading point P,.

SP.

At reading line 51-2...reading point P2°SP
2 At the reading line Sln...reading point l-P,
.

SP.

Therefore, only the pattern information of the 11X point located on the diagonal of the banknote 1 is read by the reading circuit 14 and used for identification processing and the like.

As explained above, according to the embodiment of 10), the banknote 2
Among the matrix-shaped reading points 1-, only the pattern information of the reading points located on the diagonal line of the banknote 2 is sampled and used for authenticity discrimination processing, etc., so almost the entire area of the banknote 2 can be checked with a small number of reading tracks. be able to. Therefore, it is possible to perform a more accurate discrimination between the authenticity and falsity of the falsified world and the like.

In addition, although the above-mentioned Example demonstrated the case where a banknote was used as an example of a paper sheet, this invention can be applied to various paper sheets, such as a gift certificate, in addition to a banknote.

[Brief explanation of drawings]

FIG. 1 shows the electric circuit portion of one embodiment of this invention.
FIG. 2 is a schematic block diagram. FIG. 2 is a diagram showing a reading track of snacks in a conventional device. FIG. 3 is a diagram showing a reading track for paper sheets according to the present invention. FIG. 4 is a mechanical diagram of an embodiment of the present invention. FIG. 5 is a side view of the mechanism shown in FIG. 4, viewed from the six directions of arrows. FIG. 6 is a conceptual diagram showing the reading operation of the eleventh embodiment shown in FIGS. 1 and 4. FIG. FIG. 7 is a waveform diagram of signals at various parts of the apparatus shown in FIG. 1. In the figure, 1 is an image sensor, 3 is a transport path, 4 is a light source, 7 is a pulse encoder, 11 is an amplifier, and 12 is an A/
D converter, 13 is a comparator, 14 is a reading circuit, 15.16
19 is a flip 70 block, 17 is an up counter, 18 is a down counter, 20 is an AND gate, 21 is an oscillator, 22 is a counter, and 23 and 24 are matching circuits. 17-1

Claims (1)

[Scope of Claims] A device for optically reading the pattern of a moving paper sheet, comprising a plurality of photoelectric conversion elements arranged in a direction perpendicular to the conveying direction of the paper sheet, an optical pattern detector capable of reading the entire width of the conveyance path of the paper sheet, a first pulse generating means that generates a pulse according to the conveyance speed of the paper sheet, and a pulse output from the first pulse generating means; a second pulse generating means for synchronously generating pulses for sequentially scanning the photoelectric conversion elements of the optical pattern detector; a counter for counting the number of pulses output from the second pulse generating means; Starting edge detection means for detecting a starting edge of one line of read signals output from the optical pattern detector; Termination detecting means for detecting the ending edge of one line of read signals output from the optical pattern detector; an up counter whose count value is initialized in response to the output of the start edge detection means, and whose count value increases in response to a pulse output from the first pulse generation means; a down counter whose count value is initialized in response to the output of the counter, and whose count value decreases in response to the pulse output from the first pulse generating means; a first coincidence detection means for detecting a coincidence with a count output of a counter; a second coincidence detection means for detecting a coincidence between a count output of the down counter and a count output of the counter; A pattern reading device for paper sheets, comprising means for reading the detection output of the optical pattern detector in response to the coincidence detection output of the coincidence detection means.