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Fingerprint image input apparatus

  • US 5,635,723 A
  • Filed: 12/26/1995
  • Issued: 06/03/1997
  • Est. Priority Date: 12/26/1994
  • Status: Expired due to Term
First Claim
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1. A fingerprint image input apparatus comprising:

  • a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance;

    a two-dimensional image sensor capable of allowing said light to pass through, said two-dimensional image sensor including,a plurality of pixels arranged in a matrix form, each pixel havinga photoelectric converting element for outputting a photoelectric signal in response to incident light, anda switch element for transferring said photoelectric signal as a photoelectric data signal;

    bias lines for applying a bias voltage to said photoelectric converting elements, said bias lines being connected to said pixels;

    scan lines for transferring a scan signal to said switch elements, said scan lines being connected to said pixels;

    data lines for transferring photoelectric data signals from said switch elements, said data lines being connected to said pixels;

    a bias power source for supplying said bias voltage;

    a scanning circuit for outputting said scan signal;

    a first detecting circuit for detecting said photoelectric data signal;

    a signal generator for generating a finger detection signal to detect contact of a finger with said two-dimensional image sensor;

    a second detecting circuit for detecting a change in said finger detection signal;

    a switch controller for outputting a control signal in accordance with a finger detection mode and a fingerprint image input mode;

    a first switch circuit for controlling connection between said bias lines and said second detecting circuit or said bias power source in accordance with said control signal; and

    a second switch circuit for controlling connection between said signal generator and said bias lines in accordance with said control signal; and

    an optical part for guiding light from said plane light source, having passed said two-dimensional image sensor, to a finger and guiding light reflected at said finger to said photoelectric converting element.

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