KR20020076014A - Apparatus and method for detecting overlapped bills - Google Patents

Abstract

PURPOSE: A device and a method for detecting the overlapping of a bill are provided to improve the reliability in bill overlapping detection by using the change in light transmissibility. CONSTITUTION: Light emitting elements(A1-An) and light receiving elements(B1-Bn) are placed as arrays facing each other. A bill is transferred between the light emitting elements and the light receiving elements. A light emitting circuit(21) and a current control unit(22) control on/off of the light emitting elements. A light receiving sensor(23) detects the voltage corresponding to the transmissibility of the light outputted from the light receiving elements and control on/off of the light receiving elements. A sensor switch(24) consists of an analog multiplexer. An amplifier(25) amplifies the voltage corresponding to the transmissibility of the light outputted from the light receiving elements. An analog/digital converter(26) converts the output of the amplifier to a digital signal. A data processor(27) controls the light emitting circuit and the current control unit, outputs an average by receiving the digital output of the analog/digital converter, and decides the overlapping of a bill by comparing the average to a reference value.

Description

Apparatus and method for overlapping banknotes {APPARATUS AND METHOD FOR DETECTING OVERLAPPED BILLS}

The present invention relates to a bill overlap detection device and method, and more particularly, to a bill overlap detection device and method that is suitable for improving the reliability in detecting a stack of bills by changing the transmission amount of light using a light emitting device. will be.

Referring to the accompanying drawings, a conventional banknote overlap detection apparatus and method in detail as follows.

1 is an exemplary diagram for detecting a stack of bills using a conventional light emitting device, and transfers a bill 3 between a light emitting device 1 for emitting light and a light receiving device 2 for receiving light as shown in FIG. While detecting the amount of light transmitted, the overlapping of the banknotes 3 is detected.

That is, when the light emitted from the light emitting element 1 passes through the banknote 3, the change in the amount of transmission due to the overlapping of the banknote 3 is sensed by the voltage waveform as shown in FIG. By setting a slice level, whether the banknote 3 overlaps is detected.

In the case of stack detection of bills 3 using such a light emitting device, the amount of light transmitted varies depending on the contamination state of the bills 3 surface, thereby reducing the reliability of stacking of bills 3, as shown in FIG. Similarly, when the transfer position of the banknote 3 is distorted, the permeation amount of the patterned and unpatterned regions of the banknote 3 is different from each other. It is difficult to discriminate when the banknotes 3 do not overlap in a region where the banknotes 3 overlap, and there is a problem that the reliability of the banknote 3 overlap detection is lowered.

On the other hand, another example of bill overlap detection is a method of measuring the physical thickness of the bill using a rotary variable differential transducer (RVDT) or linear variable differential transducer (LVDT).

That is, the roller is brought into contact with the banknote surface, and the mechanical gap of the roller corresponding to the thickness of the banknote is transmitted to the sensor to determine the thickness.

In the case of banknote overlap detection using such RVDT or LVDT, a precise instrument is required to accurately measure the physical change amount due to banknote stacking, and thus, there is a problem in that material cost is increased and quality control of parts is difficult.

The present invention was devised to solve the conventional problems as described above, an object of the present invention is to detect the amount of light transmitted to the entire surface of the bill through the array of the light emitting element, and through the average value of the amount of the bill It is to provide a bill overlap detection apparatus and method that can improve the reliability by detecting the overlap of.

1 is an exemplary diagram for detecting banknote overlap using a conventional light emitting device.

FIG. 2 is a graph showing voltage waveforms according to changes in the amount of light transmitted in FIG. 1; FIG.

3 is an exemplary view showing a case in which the transfer position of the bill is distorted in FIG.

Figure 4 is an exemplary view for detecting banknote overlap in accordance with an embodiment of the present invention.

Figure 5 is an exemplary view showing the light transmission amount detection of the light receiving element in the conveying direction of the bill in Figure 4;

Figure 6 is a block diagram showing a bill overlap detection apparatus according to an embodiment of the present invention.

7 is a graph showing a normal distribution of voltage waveforms with respect to whether banknotes overlap in FIGS. 4 to 6;

*** Explanation of symbols for main parts of drawing ***

A1 to An: light emitting element B1 to Bn: light receiving element

13: Banknotes

First, the bill overlap detection device for achieving the object of the present invention as described above is disposed in an array to emit light; A light receiving element arranged in an array facing the light emitting element to receive light emitted from the light emitting element; A control unit for controlling on / off of the light emitting element and the light receiving element so as to detect the amount of light transmitted to the entire surface of the banknote transferred between the light emitting element and the light receiving element; Characterized in that it comprises a data processing unit for receiving the amount of light transmitted to the entire surface of the banknote transferred between the light emitting device and the light receiving device to calculate the average value, and comparing the reference value to determine whether the banknote overlaps .

In addition, the bill overlap detection method for achieving the object of the present invention as described above comprises a first step of detecting the amount of light transmitted to the entire surface of the bill to be transferred between the light emitting element and the light receiving element arranged in an array; A second step of calculating an average value from the transmission amount of light; And comparing the average value with the reference value to determine whether the paper money is overlapped.

The bill overlap detection apparatus and method according to the present invention as described above will be described in detail with reference to the accompanying drawings.

FIG. 4 is an exemplary diagram for detecting banknote overlap according to an embodiment of the present invention. As shown in FIG. 4, the light emitting elements A1 to An and the light emitting elements A1 to An that are arranged in an array and emit light are shown in FIG. Sensing the amount of light transmitted while transferring the bills 13 between the light receiving elements B1 to Bn, which are arranged in opposite arrays and receive light emitted from the light emitting elements A1 to An, and whether the bills 13 overlap. Detect. In this case, it is preferable that the light emitting elements A1 to An and the light receiving elements B1 to Bn apply an element having a wide angle so that the average transmission amount of the banknote 13 surface can be detected from the light emission amount detection. Do.

At this time, the array of the light emitting elements (A1 to An) are all kept on when the banknotes 13 are transferred, and the light receiving elements B1 to Bn are sequentially lined one by one according to the transfer of the banknotes 13. B1-> B2->-> Bn-> B1-> B2-> ..., and senses the amount of light transmitted and detects the amount of light transmitted by the light receiving elements B1-Bn according to the conveyance direction of the banknote 13. As shown in the example of FIG. 5.

6 is a block diagram showing a bill overlap detection apparatus according to an embodiment of the present invention, in which light emitting elements A1 to An and light receiving elements are arranged in opposing arrays and conveyed therebetween as shown in FIG. (B1-Bn); A light emitting circuit part 21 and a current adjusting part 22 for controlling the on / off of the light emitting elements A1 to An; A sensor switching unit comprising a light receiving sensor unit 23 and an analog multiplexer for controlling the on / off of the light receiving elements B1 to Bn and detecting a voltage for the amount of light transmitted from the light receiving elements B1 to Bn. 24; An amplifier 25 for amplifying a voltage with respect to the amount of light transmitted from the light receiving elements B1 to Bn; An analog / digital converter 26 for converting the output of the amplifier 25 into a digital signal; The data processing unit controls the light emitting circuit unit 21 and the current control unit 22, calculates an average value by receiving the digital output of the analog / digital converter 26, and compares the reference value with a reference value to determine whether the banknotes overlap. It consists of 27.

Therefore, the normal distribution of voltage waveforms for the overlapping of banknotes is improved when the two banknotes overlap and when the banknotes do not overlap, as shown in the graph of FIG. 7, and a wide margin is obtained by using the average value. Can be secured.

The bill overlap detection apparatus and method according to the present invention as described above detects the amount of light transmitted to the entire surface of bills transported through the light emitting elements arranged in an array, calculates the average value, and compares the bill with the reference value Determination of the degree of overlap may be improved, and a wide margin may be secured to provide a product having excellent price and reliability.

Claims (6)

A light emitting device arranged in an array to emit light; A light receiving element arranged in an array facing the light emitting element to receive light emitted from the light emitting element; A control unit for controlling on / off of the light emitting element and the light receiving element so as to detect the amount of light transmitted to the entire surface of the banknote transferred between the light emitting element and the light receiving element; And a data processor for calculating an average value of the light transmitted to the entire surface of the banknote transferred between the light emitting device and the light receiving device, and comparing the reference value to determine whether the banknotes overlap. Banknote overlap detection device. 2. The banknote stack detection device according to claim 1, wherein the light emitting element and the light receiving element are wide angle elements. The bill-over stack detection according to claim 1, wherein the control unit comprises an analog multiplexer which turns on the light receiving element sequentially (B1-> B2->-> Bn-> B1-> B2 -...). Device. A first step of detecting the amount of light transmitted to the entire surface of the banknote transferred between the light emitting elements arranged in the array and the light receiving elements; A second step of calculating an average value from the transmission amount of light; And comparing the average value with the reference value to determine whether the paper money is overlapped. 5. The method of claim 4, wherein the light emitting device maintains the entire device when the banknote is transferred. 6. The light receiving elements arranged in an array facing the light emitting elements are sequentially arranged (B1-> B2-> Bn-> B1-> B2-) when bills are transferred. A bill overlap detection method, characterized in that for detecting the amount of light transmitted to the entire surface of the bill to be transported on.