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Distance measuring device

  • US 4,575,211 A
  • Filed: 04/16/1984
  • Issued: 03/11/1986
  • Est. Priority Date: 04/18/1983
  • Status: Expired due to Term
First Claim
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1. A distance measuring device, comprising:

  • light emitting means for projecting a light flux for distance measurement;

    an optical member arranged to divide and split said projected light flux emitted by said light emitting means into a plurality of projection light fluxes;

    scanning means for scanning with the plurality of projection light fluxes produced by said optical member;

    photo-electric converting means arranged to receive reflected light fluxes resulting from said plurality of projected light fluxes, said converting means having a plurality of light receiving areas, each of said light receiving areas being arranged to produce a photo-electric converted signal representing a light flux incident thereon as a result of said scanning with said projected light fluxes; and

    a circuit for receiving said photo-electric converted signals and producing distance measurement signals, said circuit being arranged to select, as an in-focus signal, any distance measurement signal that first becomes a value close to an in-focus value from distance measurement signals representing the mean value of the photo-electric converted signals from said light receiving areas of the photo-electric converting means, the output value of the photo-electric converted signals from a central part of the light receiving areas and a plurality of combined output values of the photo-electric converted signals from said light receiving areas from among said plurality of light receiving areas.

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