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Optical detecting apparatus and coordinate inputting apparatus using the detecting apparatus

  • US 6,201,605 B1
  • Filed: 05/27/1998
  • Issued: 03/13/2001
  • Est. Priority Date: 05/28/1997
  • Status: Expired due to Fees
First Claim
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1. An optical detecting apparatus comprising:

  • means for outputting light;

    stop and pass means for repeating stopping and passing the light output from said light emitting means a certain number of times according to a detected quantity of a predetermined detection object;

    light receiving means for outputting a signal of a predetermined potential by receiving light passing through said stop and pass means;

    reference potential generation means for generating a predetermined reference potential by charging;

    comparison means for comparing a potential output from said light receiving means with the reference potential;

    calculation means for calculating the detected quantity based on the result of comparison performed by said comparison means; and

    charge control means for quickly charging said reference potential generation means by applying a voltage higher than a normal voltage to said reference potential generation means when a power source for the apparatus is turned on.

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