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Position measuring laser apparatus

  • US 6,650,425 B2
  • Filed: 03/22/2001
  • Issued: 11/18/2003
  • Est. Priority Date: 03/24/2000
  • Status: Expired due to Fees
First Claim
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1. A position measuring laser apparatus comprising:

  • a first laser transmitter-receiver and a second laser transmitter-receiver, each including;

    a laser beam emitter for emitting a laser beam;

    a laser beam receiver for receiving a laser beam resulting from the emitted laser beam reflected from a reference reflecting mirror, a position measuring circuit including;

    a first output portion for outputting the drive signal having a required frequency to the laser beam emitter;

    a timing generator for generating a timing signal to be set based on a frequency of the drive signal;

    a coincidence detector for comparing the beam receiving signal with the drive signal based on the timing signal, so as to detect the coincidence therebetween;

    a second output portion for outputting an effective beam receiving signal when the coincidence is detected in sequentially predetermined times by the coincidence detector, wherein an optical axis is oriented at a required angle toward a moving body, and the position of the moving body with respect to the reference reflecting mirror is measured based on a beam receiving signal of each of the laser beams obtained by said first and second laser transmitter-receiver;

    further wherein the position measuring circuit measures the position of the moving body based on said effective beam receiving signal.

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