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Electrostatic capacitance detecting device

  • US 6,448,790 B1
  • Filed: 10/25/2000
  • Issued: 09/10/2002
  • Est. Priority Date: 10/26/1999
  • Status: Expired due to Fees
First Claim
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1. An electrostatic capacitance detecting device, comprising:

  • a detecting electrode constituting an electrostatic capacitance by being brought into contact with or put close to an object to be detected through a protection film;

    a bias switch element for injecting bias charges into said detecting electrode;

    a charge transfer switch element for transferring signal charges accumulated in said detecting electrode in response to a timing signal for signal detection;

    a capacitance element for converting the signal charges transferred thereto via said charge transfer switch element into a voltage signal;

    a source follower amplifier element, for receiving and amplifying a holding voltage of said capacitance element;

    a readout selection switch element provided on a source side of said source follower amplifier element; and

    a reset switch element for providing said capacitance element with a reset potential, wherein said detecting electrode, said bias switch element, said charge transfer switch element, said capacitance element, said source follower amplifier element, said readout selection switch element, and said reset switch element are provided on a semiconductor substrate.

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