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Light wave distance measuring apparatus and method for determining distance of an object

  • US 5,880,822 A
  • Filed: 02/14/1997
  • Issued: 03/09/1999
  • Est. Priority Date: 02/29/1996
  • Status: Expired due to Fees
First Claim
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1. A light wave distance measuring apparatus in which a distance measurement of an object is obtained by determining a phase difference between a first signal, obtained by emitting intensity-modulated light modulated by a predetermined frequency towards a target and detecting intensity-modulated light reflected from the target to a light-receiving element, and a second signal representing intensity-modulated internal light associated with a reference point, the light wave distance measuring apparatus comprising:

  • a light-sending optical system; and

    a light-receiving optical system arranged to be parallel to said light-sending optical system,wherein said intensity-modulated light is transformed into collimated rays of light that are emitted towards the target, a portion of said collimated rays of light being utilized as said second signal to determine a reference distance and a reference level,wherein said second signal comprises an internal light, and wherein said light-sending optical system comprises;

    a reflecting plate selectively positioned between said light-sending optical system and said light-receiving optical system to obtain said internal light; and

    an iris that adjusts an amount of said internal light,wherein one of the light-sending optical system and the light-receiving optical system is disposed rearwardly of the other of the light-sending optical system and the light-receiving optical system.

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