KR20000025174A - Counterfeit bill identifier using blue light emitting diode - Google Patents

Abstract

PURPOSE: A counterfeit bill identifier using blue LED(Light Emitting Diode) is provided to identify whether a bill is counter bill or not by analyzing the wavelength of ultra violet rays after emitting the lights including ultra violet rays through a blue LED and passing only the ultra violet rays among the lights reflected from the bank bill used with fluorescent material. CONSTITUTION: A blue LED(20) emits the lights comprising ultra violet rays if a bank bill(10) is inserted into a bank bill acceptor. A filter part(30) passes only the ultra violet rays and filters the other lights if the lights emitted at the blue LED(20) are reflected by the bank bill(10). A light sensor part(40) detects the strength and wavelength of the ultra violet rays and outputs it to a micro computer(50). The micro computer(50) determines whether the bank bill is counterfeit or genuine.

Description

Banknote recognition device and banknote recognition method using blue light emitting diode

The present invention relates to a bill recognition device and a bill recognition method using a blue light emitting diode (hereinafter, abbreviated as LED), and more particularly, if a bill is applied to a bill recognizer used in a coin exchanger, a vending machine, or the like. The blue LED emits light containing a small amount of ultraviolet light, and filters only the ultraviolet part of the light reflected from the banknote containing the fluorescent material, and then analyzes the ultraviolet wavelength so as to discriminate whether the banknote is abolished or not. It relates to a bill recognition device and a bill recognition method using a blue LED.

In general, various products such as coin exchangers, vending machines, etc., in which a banknote recognizer is used, need to accurately determine the authenticity of the inserted banknotes.

In this way, the bill recognizer that must determine the authenticity of the bill is generally configured optically.

In other words, the optical banknote recognizer uses an optical sensor composed of a light emitting element that emits light and a light receiving element that receives light as a banknote detecting means, and passes the banknote between the light emitting element and the light receiving element to form the geology of the banknote and the shape of the banknote surface. The light receiving element detects the corresponding amount of transmitted light, calculates and processes the output signal of the light receiving element, and compares it with reference data for predetermined dust removal to determine the authenticity of the bill.

In addition, as described above, unlike detecting the authenticity of the banknote by detecting the light transmitted through the banknote, the reflected light reflected from the banknote is detected through the light receiving element, and then the output signal of the light receiving element is processed to process the predetermined signal. The authenticity of banknotes may also be determined by comparison with reference data.

Such a conventional banknote recognizer first determines whether or not the authenticity of the bill inserted by the user into the banknote recognizer, so that a coin exchange or product sales can be made.

However, the conventional banknote recognizing apparatus as described above, when the banknote is inserted into the banknote recognizer, the banknote recognition rate was not high, such as whether the banknote is damaged or not correctly recognized according to the fluctuation of the ambient temperature. In terms of errors, a lot of errors are often recognized as a pneumothorax, there was a problem that the reliability of the product is lowered.

In addition, since the size of the ultraviolet light source used in the conventional banknote recognition device is large, there was a problem that can not achieve miniaturization of the product.

An object of the present invention is to emit a light containing a small amount of ultraviolet light through a blue LED when the banknote is applied to the banknote recognizer to filter only the ultraviolet portion of the light reflected from the banknote used fluorescent materials, by analyzing the ultraviolet wavelength To provide a banknote recognition device and a banknote recognition method using a blue LED to discriminate whether or not the banknotes abolishment.

1 is a view schematically showing the configuration of a banknote recognition device using a blue light emitting diode according to the present invention;

2a and 2b is a circuit diagram showing in detail the circuit configuration of the bill recognition device using a blue light emitting diode according to the present invention;

3 is a detailed operation flowchart illustrating a banknote recognition process using a blue light emitting diode according to the present invention.

Explanation of symbols on the main parts of the drawings

10: banknote 20: blue LED

30 filter unit 40 light sensor unit

50: microcomputer

The present invention for achieving this object is a blue LED that emits light containing a small amount of ultraviolet light when the banknote is applied by the user to the banknote recognition, and the ultraviolet light is passed when the light emitted from the blue LED is reflected by the banknote Other light is filtered by the filter unit, an optical sensor unit that detects the intensity and wavelength of the ultraviolet rays inputted through the filter unit, and amplifies it and outputs the light, It is characterized by comprising a microcomputer to determine the authenticity of the bill compared to the data.

Hereinafter, with reference to the accompanying drawings will be described in detail the banknote recognition device and banknote recognition method using a blue LED of the present invention.

1 is a view schematically showing the configuration of a bill recognition device using a blue light emitting diode according to the present invention, Figures 2a and 2b is a circuit diagram showing in detail the circuit configuration of the above-described bill recognition device.

As shown, the blue LED 20 emits light containing a small amount of ultraviolet rays when the banknote 10 is inserted into the banknote recognizer by the user.

The filter unit 30 is formed by overlapping a plurality of cellophane paper. When the light emitted from the blue LED 20 is reflected by the banknote 10, ultraviolet light passes and other light is filtered.

At this time, since the banknote 10 is typically manufactured to include a fluorescent material so that it can be easily distinguished from counterfeit money, it reflects the light emitted from the blue LED (20).

The optical sensor unit 40 detects the reflected light of the banknote filtered through the filter unit 30, that is, the intensity and the wavelength of the ultraviolet ray, amplifies it, and outputs it to the microcomputer 50 to be described later.

It is common for this optical sensor part 40 to use a photo transistor.

The microcomputer 50 compares the intensity or wavelength of the ultraviolet rays output from the optical sensor unit 40 with the previously-occupied dusting data to determine the authenticity of the banknote inserted into the banknote recognizer.

Next, the operation of the banknote recognition device and banknote recognition method using the blue LED according to the present invention configured as described above will be described in detail with reference to FIG.

3 is a detailed operation flowchart illustrating a banknote recognition process using a blue light emitting diode according to the present invention.

First, when a user inserts a bill into a bill recognizer to use a coin exchanger, a vending machine or the like (S1), the blue LED 20 emitting light containing a small amount of ultraviolet light components is emitted (S2).

When the blue LED 20 emits light, the emitted light is reflected by the banknote 10 containing the fluorescent material, and the reflected light passes only the ultraviolet portion through the filter unit 30 and other light. Is filtered (S3).

The ultraviolet light filtered by the filter unit 30 is received by the optical sensor unit 40, and after the ultraviolet light received by the optical sensor unit 40 is amplified, the ultraviolet signal as illustrated in FIG. 2A or 2B. Is output to the microcomputer 50 (S4).

Accordingly, the microcomputer 50 compares the intensity or the wavelength of the ultraviolet rays applied from the optical sensor unit 40 with previously stored pneumatic data (S5).

Now, after comparing the data through the above-described step (S5), it is determined whether the comparison value is within the tolerance range set in the microcomputer 50 (S6).

As a result of the determination, when the comparison value for the pneumatic data of the ultraviolet rays reflected from the bill 10 is within the tolerance range, the bill 10 inserted into the bill recognizer is determined to be pneumatic and the device is operated (S7). If not, it is determined as counterfeit and the bill is returned (S8).

Herein, the present invention has been described by using the blue LED and the filter to discriminate the authenticity of the banknote by using the ultraviolet wavelength reflected from the banknote containing the fluorescent paint, but the present invention is not limited thereto. Of course, it can be configured to discriminate the amount of bills through the ultraviolet wavelength.

As described above, according to the banknote recognition device and banknote recognition method using the blue LED of the present invention, by using the filter formed of the blue LED and cellophane paper, it is possible to accurately determine the authenticity of the bill inserted into the banknote recognizer without error. In addition to improving the reliability of the compact blue LED as a light source has a merit that can be produced by compact banknote recognizer.

Claims (3)

A blue LED which emits light containing a small amount of ultraviolet rays when the banknote is applied by the user to the banknote recognizer; A filter unit configured to pass ultraviolet rays and filter other light when the light emitted from the blue LED is reflected by the banknote; An optical sensor unit which detects the intensity and wavelength of the ultraviolet rays inputted through the filter unit and amplifies the ultraviolet rays; And Banknote recognition device using a blue LED, characterized in that the microcomputer to determine the authenticity of the bill by comparing the intensity and wavelength of the ultraviolet rays output from the light sensor unit with the pre-stored cough data. According to claim 1, The filter unit; Banknote recognition device using a blue LED, characterized in that formed by overlapping a number of cellophane paper. A first step of emitting blue LEDs when a bill is inserted into the bill recognizer by the user; A second step of filtering the portions other than the ultraviolet rays when the light emitted from the blue LED of the first stage is reflected by the banknote, receiving the ultraviolet rays, amplifying them, and outputting them to the microcomputer; A third step of comparing the intensity or wavelength of the ultraviolet rays inputted through the second step with previously stored pneumatic data to determine whether the tolerance range is exceeded; And When the determination result of the fourth step is within the tolerance range, it is determined that the device is pneumatic and the operation of the device is performed. Otherwise, the banknote is recognized using the blue LED. Way.