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Contact image sensor module for banknote recognition

An image sensor, contact technology, applied in character and pattern recognition, computer components, computing, etc., can solve the problems affecting image stability, no LED protection measures, and cannot realize dynamic adjustment, etc., to achieve the effect of stable function

Inactive Publication Date: 2012-01-18
SHENZHEN YIHUA COMP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the prior art, in the CIS (Contact Image Sensor) sensor circuit, the CIS is directly connected to the external processing board. At this time, the analog signal and the control signal have long wiring, which is easy to introduce external interference and affect the stability of the image; secondly, the CIS The LED drive adopts a simple voltage source and current limiting resistor, the current is easily affected by the interference of the voltage source and the change of the parameters of the current limiting resistor, thus affecting the image stability, and there is no LED protection measure; in addition, for the CIS resolution selection The resistance jumper method cannot realize dynamic adjustment; in addition, the digital image data after analog-to-digital conversion is transmitted in parallel with a single-ended signal, which is not suitable for long-distance transmission; Inconvenience caused by models, system upgrades and system maintenance

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  • Contact image sensor module for banknote recognition
  • Contact image sensor module for banknote recognition
  • Contact image sensor module for banknote recognition

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing:

[0017] The invention relates to a contact image sensor module used for banknote identification.

[0018] figure 1 It is a block diagram of the present invention, which includes CIS (contact image sensor), resolution setting circuit, LED constant current drive circuit, AFE (analog front-end circuit), FPGA (programmable logic device), and parallel-to-serial circuit. The driving current and PWM time of the LED constant current driving circuit can be adjusted; at the same time, the constant current driving circuit is equipped with a protection circuit to prevent accidental LED burnout.

[0019] CIS (Contact Image Sensor), used to convert the image into a voltage signal, its timing control signal is generated by FPGA (Programmable Logic Device), its resolution setting signal is input by the resolution setting circuit, and its LED driver is driven by LED constant current The dr...

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Abstract

The invention relates to a contact image sensor module for banknote recognition, which comprises a contact image sensor (CIS) which is used for converting an image into a voltage signal; a resolution setting circuit which is used for setting different resolutions of the CIS; a light-emitting diode (LED) constant-current drive circuit which is used for controlling the magnitude of the drive current of an LED and keeping the drive current to be constant; an analog front-end (AFE) circuit which is used for amplifying the analog signal of the image; a field programmable gate array (FPGA) logic device which is used for generating control signals for the CIS, the resolution setting circuit, the LED constant-current drive circuit, the AFE circuit and the like; and a parallel-to-serial conversion circuit which is used for completing the parallel-to-serial conversion of a digital image signal, wherein the input of the parallel-to-serial conversion circuit comes from the AFE circuit and the output of the parallel-to-serial conversion circuit is directly output to an external circuit board through an external interface.

Description

technical field [0001] The invention relates to a contact image sensor module for banknote identification. Background technique [0002] In the prior art, in the CIS (Contact Image Sensor) sensor circuit, the CIS is directly connected to the external processing board. At this time, the analog signal and the control signal have long wiring, which is easy to introduce external interference and affect the stability of the image; secondly, the CIS The LED drive adopts a simple voltage source and current limiting resistor, the current is easily affected by the interference of the voltage source and the change of the parameters of the current limiting resistor, thus affecting the image stability, and there is no LED protection measure; in addition, for the CIS resolution selection The resistance jumper method cannot realize dynamic adjustment; in addition, the digital image data after analog-to-digital conversion is transmitted in parallel with a single-ended signal, which is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07D7/20
Inventor 彭彤石鸥赵玉民吴连玉
Owner SHENZHEN YIHUA COMP
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