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Optical displacement detector including a displacement member's surface having a diffractive pattern and a holographic lens pattern

  • US 5,073,710 A
  • Filed: 09/19/1990
  • Issued: 12/17/1991
  • Est. Priority Date: 09/21/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for optically detecting displacement, comprising:

  • light source means for emitting a coherent primary light;

    a displacement member undergoing a displacement transversely of the primary light to receive the primary light on its face, the displacement member having on its face a diffractive pattern effective to diffract the primary light and a holographic lens pattern effective to converge the primary light, thereby converting the primary light into a secondary light; and

    detection means receptive of the secondary light to detect optically the displacement of the displacement member.

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