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Currency detector using laser light source

A technology of laser light sources and lasers, which is applied to the authenticity inspection of banknotes, handling coins or valuable banknotes, instruments, etc., can solve the problems of high cost, complex circuit and structure, slow detection speed, etc., and achieve high accuracy, circuit And the effect of simple structure and fast detection speed

Inactive Publication Date: 2010-06-30
余维
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current counterfeiting technology, this banknote detector has high accuracy, but the circuit and structure are complicated, the cost is high, and the detection speed is slow.

Method used

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  • Currency detector using laser light source
  • Currency detector using laser light source
  • Currency detector using laser light source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 2 As shown, the infrared beam emitted by the infrared laser 1 with a frequency range of 0.1-100KHZ (such as 980nm, infrared light in the range of 780-1500nm can be used) is focused on the infrared up-conversion material 3 on the banknote through the lens 2, and the material is Excited to emit visible light, the visible light passes through the paper fiber 4 of the banknote, and is incident on the photosensitive device 6. The photosensitive device 6 converts the optical signal into an electrical signal, and then transmits the signal to the single-chip microcomputer system 7, and the single-chip microcomputer system determines the authenticity. judge. The single-chip microcomputer system includes a preamplifier circuit, an A / D conversion circuit, a single-chip microcomputer chip and necessary circuits.

Embodiment 2

[0034] Such as image 3 As shown, since the infrared up-converting material on the banknote is coated on one side of the banknote, when the other side of the banknote faces up and enters the banknote detector, the infrared beam emitted by the infrared laser 1, after being focused by the lens 2, first passes through the banknote paper fiber, which is then irradiated onto an infrared upconversion material. The material is excited to emit visible light, which is filtered by the filter 10 and then incident on the photosensitive device 6. The filter has a good transmittance for the visible light band emitted by the excited up-conversion material on the banknote. , while in other bands, the transmittance is very low. The photosensitive device 6 changes the optical signal into an electrical signal, and then transmits the signal to the single-chip microcomputer system 7, and the single-chip microcomputer system makes a judgment of authenticity. The single-chip microcomputer system i...

Embodiment 3

[0036] During the detection process, optical fiber can be used to transmit the light beam in order to obtain a better signal. Such as Figure 4 As shown, the infrared laser 1 is coupled with the optical fiber 5, and the other end of the optical fiber 5 is coupled with the collimator 8. The collimator is arranged opposite to the photosensitive device 6, and the infrared beam emitted by the laser is transmitted from the collimator 8 through the optical fiber 5. When irradiated on the infrared up-conversion material 3 on the banknote, the material is excited and emits visible light, which passes through the paper fiber 4 of the banknote and is incident on the photosensitive device 6, which converts the optical signal into an electrical signal, and then The signal is transmitted to the single-chip microcomputer system 7, and the authenticity judgment is made by the single-chip microcomputer system. The single-chip microcomputer system includes a preamplifier circuit, an A / D conve...

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PUM

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Abstract

The invention provides a currency detector using a laser light source, which comprises a currency receiving plate, a cleaner starting tie-in, a starting sensor, a currency feeding plate, a power supply switch, one or more infrared laser, one or more visible light photosensitive element, a signal processing circuit and an executing device. The laser beam having a wavelength between 780 and 1500nm and emitted by the infrared laser is irradiated on the infrared up-conversion material false proof mark of the currency, the generated visible light is received by the photosensitive element, the light is amplified by a pre-amplifier and then the signal is operated and processed so as to identify the currency. The detector of the invention has high accuracy, simple circuit and structure, low cost and high detecting speed.

Description

technical field [0001] The invention relates to a banknote checking device, in particular to a banknote checking device using an infrared laser light source. Background technique [0002] Counterfeit banknotes interfere with normal currency circulation, disrupt economic order, affect economic, financial and social stability, cause economic losses to business units and individuals, and bring a lot of inconvenience to life. In response to the increasingly rampant counterfeit banknotes, countries around the world have taken corresponding measures, spared no effort in currency manufacturing and anti-counterfeiting, and strived to apply modern cutting-edge technology to create more perfect and more difficult-to-counterfeit currencies to protect their own economies. For example, the original Deutsche Mark has 23 anti-counterfeiting technologies, and the U.S. dollar has 8 anti-counterfeiting technologies. The fifth set of banknotes in my country adopts ten anti-counterfeiting techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07D7/12
Inventor 黄碧雄余维李思悦陈志强崔晓岚吕一旻
Owner 余维
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