KR20100000825A - A apparatus for detecting medium and a method for detecting thereof - Google Patents

Abstract

PURPOSE: A medium discerning device and a method thereof are provided to shorten a bill discernment time by minimizing a noise flowed from outside and an inner circuit. CONSTITUTION: A first magnetic sensor(110a) and a second magnetic sensor(110b) sense a magnetic component printed to a fixed position of a bill. A first amplifying/band pass filter part(120a) and a second amplifying/band pass filter part(120b) amplify the sensed magnetic component, and filter an amplified noise. A differential analog/digital converter(130) converts a reduced magnetic component into a digital signal. A control part(140) receives the digital signal, reads the digital signal, and determines the bill by comparing a reference value with one digital signal. A storage part(150) stores the reference value.

Description

ACCARATUS FOR DETECTING MEDIUM AND A METHOD FOR DETECTING THEREOF}

The present invention relates to a medium discrimination apparatus, and more particularly, to a medium discrimination apparatus and a method for discriminating the medium for minimizing noise to improve the media discrimination power.

The term "medium" in the present specification refers to, for example, a bill, a check, a ticket, a certificate, and the like, and may have various thicknesses having a very thin thickness compared to a width and a length. In the present specification, a banknote will be described as an example.

In general, the banknote discrimination device is applied to the automatic teller machine, media handling machine, vending machine, etc. to determine the type and forgery of the banknote by recognizing the magnetic component, image, silver, fluorescent ink, various numbers and letters printed on the banknote. Done.

1 is a partial cross-sectional view of a bill discrimination apparatus for reading a magnetic component printed on a bill.

Referring to FIG. 1, first and second magnetic sensors 12a and 12b for detecting magnetic components printed on a banknote 30 are arranged in a row at an upper bracket 10 at predetermined intervals. In this case, the magnetic sensors 12a and 12b are installed so that the sensing surface is exposed downward, and installed so as to be perpendicular to the direction in which the banknote 30 is transferred, thereby detecting the magnetic component printed on the banknote.

Here, the first and second magnetic sensors 12a and 12b are magnetoresistive sensors and are magnetic pattern recognition sensors.

As the first and second magnetic sensors 12a and 12b are installed in line with each other, they are driven in opposition to the lower bank transfer rollers 24a and 24b which describe the inserted bill 30. The upper bank transfer roller 14a, 14b is provided.

In the lower bracket 20, as the banknote conveying roller shaft 22 rotates, the lower banknote conveying rollers 24a and 24b for conveying the banknote 30 and the conveyed banknote 30 are made. Push up the first and second magnetic sensors 12a and 12b to bring the banknote 30 closer to the first and second magnetic sensors 12a and 12b so that the magnetic component printed on the banknote can be detected more accurately. Sensor contact rollers 26a and 26b are provided.

The rollers 24a, 24b, 26a, and 26b are arranged at predetermined intervals on the bill conveying roller shaft 22, and the lower bill conveying rollers 24a and 24b are respectively the upper bill conveying rollers 14a. 14b are provided so as to face each other, and the sensor contact rollers 26a and 26b are installed so as to face the first and second magnetic sensors 12a and 12b, respectively.

Lower support springs 28a and 28b are provided at both ends of the bill conveying roller shaft 22 to continuously push the bill conveying roller shaft 22 upward. This keeps the upper paper transfer rollers 14a and 14b and the first and second magnetic sensors 12a and 12b facing each other opposite the rollers 24a, 24b, 26a and 26b, respectively. To do this. At this time, bearers 29a and 29b are provided to prevent the rollers 24a, 24b, 26a and 26b from being in close contact with each other by the elasticity of the lower support springs 28a and 28b.

On the other hand, although not shown in the drawings, the analog signals for the magnetic components sensed from the first and second magnetic sensors 12a, 12b are respectively received, and amplified to a stable signal strength, respectively, according to the amplification An amplification / band-pass filter for filtering noise that is amplified together, and an analog to digital converter for converting each of the two filtered analog signals into a digital signal; Abbreviated as "AD converter"), and a micro controller unit (hereinafter referred to as "MCU") for discriminating the authenticity of the inserted bill 30 by reading the converted two digital signals. .) Is provided.

The banknote discrimination apparatus configured as described above can be in close contact with the magnetic sensor by the roller that is elastically supported to improve the banknote discrimination performance.

However, the bill discrimination apparatus has the following problems.

2 shows output graphs of two digital signals output from the AD converter.

First, the 'X' axis of the graph refers to the position value of the magnetic component, and the 'Y' axis refers to the strength value of the magnetic component.

Referring to FIG. 2, the converted digital signal includes both the magnetic component A of the inserted banknote and the magnetic component (ie, noise B) flowing from the internal circuit and the outside. At this time, the magnetic component A of the banknote is sensed only at the first magnetic sensor 110a. This is because the magnetic component is printed only at a specific position for each bill. If the bill is reversed, the magnetic component A printed on the bill will be sensed by the second magnetic sensor 12b.

Since the noise (B) has a relatively large magnetic component strength value, the MCU has a great influence when the magnetic component (A) of the banknote is read to discriminate the authenticity of the banknote. That is, the result is to reduce the discrimination power of the MCU.

In addition, since the MCU receives two digital signals (ⓐ, ⓑ) from the AD converter and processes them all, there is a problem in that the discrimination time is required.

In addition, an expensive magnetic shielding film and a nonmagnetic material may be used to prevent noise (B) flowing from the internal circuit and the outside, but in this case, the cost may be increased and the maintenance may be difficult. .

Accordingly, an object of the present invention is to solve the above problems, and to provide a medium discrimination apparatus and a method for discriminating the bill for minimizing noise when the bill is introduced to improve bill discrimination.

Another object of the present invention is to shorten the time for discriminating bills.

According to a feature of the present invention for achieving the above object, at least two magnetic sensors for sensing a magnetic component printed on a predetermined position of the medium to be inserted; A differential analog / digital converter for subtracting the magnetic components of the analog signals sensed by the magnetic sensors and converting them into one digital signal; And a controller for discriminating the authenticity of the inserted medium according to the converted digital signal.

An amplification / bandpass filter unit corresponding to the magnetic sensor 1: 1 and amplifying a magnetic component of the analog signal sensed by the magnetic sensor and filtering noise; and a storage unit storing a reference value at the time of authenticity discrimination It is configured by.

The reference value refers to a magnetic component intensity value printed at a predetermined position of the medium.

The magnetic sensor is a magnetic pattern recognition sensor.

According to another feature of the invention, the medium and the step of introducing the medium; A magnetic component detection step of sensing magnetic components printed at a predetermined position of the incoming medium by two or more magnetic sensors, and a subtraction step of subtracting magnetic components of the sensed analog signal; A signal conversion step of converting the magnetic component of the subtracted analog signal into a digital signal; And authenticity discrimination step of discriminating the authenticity of the inserted medium based on the converted digital signal.

The subtraction step cancels noise included in magnetic components of the sensed analog signal.

According to the subtraction step, the magnitude of the noise is relatively smaller than the magnetic component strength value of the medium.

According to another feature of the invention, a plurality of magnetic sensors for sensing the magnetic component contained in the medium to be introduced; A subtraction unit for subtracting each of the magnetic component signals sensed and output by the magnetic sensor; And a medium discriminating unit receiving the output signal subtracted by the subtracting unit and discriminating the authenticity of the medium.

The plurality of magnetic sensors may include first and second magnetic sensors, and the subtractor may include a first interface unit receiving a first magnetic component signal sensed and output from the first magnetic sensor, and the second magnetic sensor. And a second interface unit receiving the second magnetic component signal sensed and output from the sensor, and a differential circuit unit for subtracting the transmitted first and second magnetic component signals.

The medium discriminating apparatus and the discriminating method of the present invention having such a configuration have the following effects.

First, when the bills are drawn in, the magnetic components printed on the bills are summed into one signal by the subtraction function to minimize the noise flowing from the internal circuit and the outside, thereby improving the medium discrimination ability and shortening the time required for discriminating the bills. There is.

In addition, it is possible to replace the metal material used in the media discriminator and its external housing with a low-cost material, which is easy to reduce costs and maintain.

Hereinafter, a medium discrimination apparatus and a control method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the preferred embodiment shown in the accompanying drawings.

3 is a block diagram of a medium discrimination apparatus according to a first embodiment of the present invention. Since the medium discriminating apparatus of the present embodiment detects and processes magnetic components printed on bills, only such a configuration will be described.

Referring to FIG. 3, the bill discrimination apparatus 100 includes first and second magnetic sensors 110a and 110b that sense magnetic components printed at predetermined positions of bills to be inserted. Here, when a magnetic component is printed only on a specific portion of the bill, the first magnetic sensor 110a senses a magnetic component printed on the specific portion of the bill, and the second magnetic sensor 110b. ) Does not sense the magnetic component printed on the incoming banknote, but senses only the magnetic component (ie, noise) flowing from the internal circuit and the outside.

The sensed magnetic component may be obtained as an analog waveform by sensing bills into which the first and second magnetic sensors 110a and 110b are inserted at predetermined intervals (for example, 1 mm and 2 mm). Of course, the predetermined section can be reduced or increased the length of the section as necessary.

The first and second magnetic sensors 110a and 110b may be magnetic resistance sensors, and may be magnetic pattern recognition sensors. In addition, the magnetic sensors need not necessarily be two, but three or more magnetic sensors may be provided at an optimal position according to the printed magnetic component to further improve discrimination.

Since the sensed magnetic component is degraded with repeated use and time, the first and second amplification / bands for amplifying the magnetic component and filtering noise that are amplified together according to the amplification. Amp & Band-pass Filters 120a and 120b are provided.

The first and second magnetic sensors 110a and 110b and the first and second amplification / band pass filter units 120a and 120b are configured to correspond 1: 1.

A differential analog / subtracting magnetic component filtered by the first and second amplification / band-pass filters 120a and 120b and then converting the subtracted magnetic component into a digital signal. A digital analog converter (hereinafter, abbreviated as "AD converter") 130 is provided. The subtraction method subtracts the magnetic component of the analog signal transmitted from the second amplification / bandpass filter 120b from the magnetic component of the analog signal transmitted from the first amplification / bandpass filter 120a. Of course, the magnetic component of the analog signal transmitted from the first amplification / bandpass filter 120a may be subtracted from the magnetic component of the analog signal transmitted from the second amplification / bandpass filter 120b. Accordingly, the two analog signals are summed into one analog signal in which noise is mostly canceled out. The AD converter 130 quantizes the summed analog signal and converts the summed analog signal into a digital signal.

The controller 140 receives the converted digital signal and reads the converted digital signal. That is, the control unit 140 compares the transmitted digital signal with a reference value for puffing to determine the authenticity of the inserted bill.

The storage unit 150 is provided with a storage unit 150 for storing the reference value for determining the authenticity of the bill. The pneumatic reference value includes a position value of a magnetic component printed on a bill and a magnetic component intensity value corresponding thereto.

Hereinafter, a medium discrimination method according to the first embodiment of the present invention having the configuration as described above will be described in detail with reference to FIG.

Referring to FIG. 4, when a bill is inserted through the bill insertion unit, an inflow detection sensor (not shown) detects this (S100).

When the bill input is detected as a result of the sensing, the controller 140 transmits a control signal to the first and second magnetic sensors 110a and 110b.

When the bill is moved according to the transmitted control signal, the first and second magnetic sensors 110a and 110b sense the magnetic component printed at a predetermined position of the bill (S102). That is, the first and second magnetic sensors 110a and 110b sense magnetic components every predetermined interval, for example, 1 mm, of the incoming banknote.

The first and second magnetic sensors 110a and 110b transfer the magnetic components sensed in each of the predetermined sections to the first and second amplification / bandpass filters 120a and 120b as analog signals, respectively.

In step 104, the first and second amplification / bandpass filters 120a and 120b amplify the transmitted analog signal into an analog signal having a large power and filter the amplified noise together (S104). ). The first and second amplification / bandpass filters 120a and 120b transmit the same to a differential analog to digital converter (hereinafter, referred to as an “AD converter”) 130.

Then, the AD converter 130 receives the filtered two analog signals and subtracts them. For example, the AD converter 130 subtracts the analog signal transmitted from the second amplification / bandpass filter 120b from the analog signal transmitted from the first amplification / bandpass filter 120a. Accordingly, the two analog signals are summed into one analog signal in which noise is mostly canceled out.

The AD converter 130 quantizes the summed analog signal, converts the digital signal into a digital signal, and transfers the converted analog signal to the controller 140 (S106). For example, FIG. 5 shows an output graph of the converted digital signal. Here, the 'X' axis of the graph refers to the position value of the magnetic component, the 'Y' axis refers to the strength value of the magnetic component. Referring to FIG. 5, the converted digital signal ⓒ cancels most of the noise according to the subtraction function so that only noise C having a small magnetic component intensity value exists. Of course, as the subtraction function is performed, the intensity value of the magnetic component D printed on the bill is also partially canceled, but the value is insignificant. Accordingly, the magnetic component (D) printed on the bill has a result that is relatively large compared with the noise (C).

Accordingly, the control unit 140 receives the digital signal, accesses the storage unit 150, and reads it (S108). That is, the controller 140 compares the magnetic component of the banknote included in the transmitted digital signal with the reference value of the pulmonary value stored in the storage unit 150 to discriminate the authenticity of the inserted banknote. The authenticity is to determine whether or not the magnetic component intensity value for the position value at which the magnetic component printed on the banknote is sensed coincides with the reference value for the dusting. For example, FIG. 6 shows a table of the pneumococcal reference values. As shown in Fig. 6, the reference value for pneumocontraction is a magnetic component position value E for dividing the total length of a banknote (for example, the short side of a 10,000 won bill is 68 mm) in units of 1 mm, and the magnetic component position value. ('A' in FIG. 5), ie, magnetic component strength values F corresponding to each of approximately 49 mm to 60 mm. For convenience of description, only the reference value of the pneumatics for one case has been described, but the pneumatic reference values for all cases corresponding to the winding and billing direction (that is, the front and back, left and right reversed) is stored in the storage unit 150 Of course. So, for example, when the intensity value of the magnetic component detected at the magnetic component position value '50mm' is '30', the magnetic component intensity value detected at the magnetic component position value '54mm' is '-'. In case of 50 ', it is discriminated against. In this case, the authenticity of the banknote is determined to match if the degree of coincidence is equal to or greater than a certain ratio in preparation for the case where the magnetic component of the specific position is damaged or the banknote is damaged.

At this time, the control unit 140 reduces the discrimination time because it determines whether the authenticity is calculated by processing only one digital signal transmitted from the AD converter 130.

On the other hand, Figure 7 is a block diagram of a medium discrimination apparatus according to a second embodiment of the present invention.

Referring to FIG. 7, the banknote discrimination apparatus 200 includes first and second magnetic sensors 210a and 210b that sense magnetic components printed at predetermined positions of bills to be inserted. Here, when a magnetic component is printed only on a specific portion of the incoming banknote, the first magnetic sensor 210a senses a magnetic component printed on the specific portion of the incoming banknote, and the second magnetic sensor 210b. ) Does not sense the magnetic component printed on the incoming banknote, but senses only the magnetic component (ie, noise) flowing from the internal circuit and the outside.

It is not necessary to have two magnetic sensors, but three or more magnetic sensors may be installed at an optimal position according to the printed magnetic component to further improve discrimination.

The subtraction unit 220 receives the sensed magnetic component signal and subtracts it. The subtraction unit 220 includes a first interface unit 222a receiving the first magnetic component signal sensed by the first magnetic sensor 210a and a second sensor sensed by the second magnetic sensor 210b. A second interface unit 222b receiving the magnetic component signal and a differential circuit unit 224 mutually subtracting the transmitted first and second magnetic component signals are provided.

A bill discrimination unit 230 is provided to receive the output signal subtracted by the differential circuit unit 224 and discriminate the authenticity of the inserted bill by using the same.

The operation process of the medium discrimination apparatus having such a configuration is as follows.

When a bill is drawn through the bill insertion unit and transferred to the bill discrimination apparatus 200, the first and second magnetic sensors 210a and 210b sense the magnetic component printed at a predetermined position of the bill. That is, the first and second magnetic sensors 210a and 210b sense magnetic components every predetermined period of the bill, for example, 1 mm.

When the first and second magnetic component signals sensed by the first and second magnetic sensors 210a and 210b are transmitted through the first and second interface units 222a and 222b, respectively, the differential circuit unit 224 ) Mutually subtracts the transmitted first and second magnetic component signals.

Then, the banknote discrimination unit 230 receives the output signal subtracted by the differential circuit unit 224, and discriminates the authenticity of the inserted banknotes.

As described above, the present invention described in the above embodiment has an advantage of improving medium discrimination power and shortening discrimination time by minimizing noise generated by using a subtracting function when discriminating authenticity of banknotes.

Although described with reference to the illustrated embodiment of the present invention as described above, this is merely exemplary, those skilled in the art to which the present invention pertains various modifications without departing from the spirit and scope of the present invention. It will be apparent that other embodiments may be modified and equivalent. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a partial cross-sectional view of a conventional banknote discrimination apparatus.

2 is an output graph of a digital signal converted by the AD converter of FIG.

3 is a block diagram of a medium discrimination apparatus according to a first embodiment of the present invention.

4 is a flowchart of a medium discrimination method according to a first embodiment of the present invention;

5 is an output graph of a digital signal converted by a differential AD converter.

6 is a table of pneumococcal reference values.

7 is a block diagram of a medium discrimination apparatus according to a second embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: banknote discrimination device 110a: first magnetic sensor

110b: second magnetic sensor 120a: first amplification / bandpass filter

120b: second amplification / bandpass filter 130: differential AD converter

140: control unit 150: storage unit

Claims (9)

A plurality of magnetic sensors for sensing a magnetic component printed at a predetermined position of a retracted medium; A differential analog / digital converter for subtracting the magnetic components of the analog signals sensed by the magnetic sensors and converting them into one digital signal; And And a controller for discriminating the authenticity of the inserted medium according to the converted digital signal. The method of claim 1, An amplification / bandpass filter unit corresponding to the magnetic sensor 1: 1 and amplifying a magnetic component of an analog signal sensed by the magnetic sensor and filtering noise; and And a storage unit configured to store a reference value when the authenticity is discriminated. The method of claim 2, And the reference value is a magnetic component intensity value printed at a predetermined position of the medium. The method of claim 1, The magnetic sensor is a medium discrimination apparatus, characterized in that the magnetic pattern recognition sensor (Magnetic Pattern Recognition Sensor). A medium retraction step into which the medium is retracted; A magnetic component sensing step in which two or more magnetic sensors sense magnetic components printed at a predetermined position of the retracted medium; Subtracting a magnetic component of the sensed analog signal; A signal conversion step of converting a magnetic component of the subtracted analog signal into a digital signal; And And authenticity discrimination step of discriminating the authenticity of the inserted medium based on the converted digital signal. The method of claim 5, And the subtracting step cancels noise included in magnetic components of the sensed analog signal. The method of claim 6, According to the subtraction step, the size of the noise is characterized in that the relatively smaller than the magnetic component strength value of the medium. A plurality of magnetic sensors for sensing magnetic components included in the drawn medium; A subtraction unit which mutually subtracts the magnetic component signals sensed and output by the magnetic sensors; And And a medium discriminating unit receiving the output signal subtracted by the subtracting unit and discriminating the authenticity of the medium. The method of claim 8, The plurality of magnetic sensors are configured to include first and second magnetic sensors, The subtraction part, A first interface unit receiving a first magnetic component signal sensed and output from the first magnetic sensor; A second interface unit receiving a second magnetic component signal sensed and output from the second magnetic sensor; And And a differential circuit unit which mutually subtracts the transmitted first and second magnetic component signals.

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