×

Photo detecting apparatus for detecting reflected light from an object and excluding an external light componet from the reflected light

  • US 5,705,807 A
  • Filed: 10/24/1995
  • Issued: 01/06/1998
  • Est. Priority Date: 10/24/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. A photo detecting apparatus for detecting reflected light from an object and excluding an external light component from the reflected light comprising:

  • a light-emitting unit for emitting light; and

    a photo detecting unit, having a plurality of pixels, for detecting light reflected from an object;

    the photo detecting unit, for each pixel, having photoelectric conversion means for converting incident light into a photoelectric current; and

    differential electric quantity generation means for calculating a difference between an electric quantity based on a photoelectric current obtained by said photoelectric conversion means in a first period and an electric quantity based on a photoelectric current obtained by said photoelectric conversion means in a second period;

    wherein the first period is a period in which the light-emitting unit is emitting light, and the second period is a period in which the light-emitting unit is not emitting light.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×