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Countertriangular optical position sensor

  • US 5,078,333 A
  • Filed: 10/29/1990
  • Issued: 01/07/1992
  • Est. Priority Date: 10/29/1990
  • Status: Expired due to Fees
First Claim
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1. Optical position sensing apparatus for sensing the position of a moving body as it passes a fixed point, comprising:

  • a) a two-component photodiode surface disposed at said fixed point for generating an electrical signal in response to light impinging thereon, each of said components being electrically insulated from each other;

    b) a light emitting source spaced from said two-component photodiode surface for uniformly illuminating said surface;

    c) guide means for guiding said moving body between said light emitting source and said two-component photodiode surface in a position to cast a shadow onto each component of said photodiode surface corresponding to the volume and position of said body; and

    d) means for receiving electrical signals generated by each of said photodiode components for comparing said signals and producing a signal indicative of the position of said moving body.

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