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Optical device for measuring the speed of a moved surface by means of a measuring light beam from a laser

  • US 5,339,196 A
  • Filed: 05/27/1992
  • Issued: 08/16/1994
  • Est. Priority Date: 09/27/1990
  • Status: Expired due to Fees
First Claim
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1. An optical device for measuring the speed of a moving surface through utilization of a laser beam split into two sub-beams, said optical device comprising:

  • a transmitting prism arrangement comprising two prism bodies, each of said prism bodies being associated with one of said sub-beams;

    each prism body having base surfaces, refractive surfaces and reflective surfaces arranged and oriented for allowing said associated sub-beam to enter said respective prism body to be guided in said respective prism body and to leave said respective prism body;

    said sub-beam leaving said prism body being displaced outwardly in relation to a center plane of said transmitting prism arrangement between said prism bodies so that the degree of beam splitting is increased and said sub-beams converge on a common point of intersection;

    said prism bodies being secured at a glass mounting plate and said base surfaces of said prism bodies being arranged in a plane-parallel manner.

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