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Multi-track optical shaft position and timing cylinder

  • US 4,667,098 A
  • Filed: 03/29/1985
  • Issued: 05/19/1987
  • Est. Priority Date: 03/29/1985
  • Status: Expired due to Fees
First Claim
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1. Optical encoder apparatus for sensing predetermined parameters relating to the rotation of a shaft, comprising:

  • a cylindrical support member mounted on said shaft;

    a coding member having a first and second portion, said first portion including at least one coding track having a predetermined coding pattern of surface areas which selectively pass and block light energy and projecting axially beyond one end of said cylindrical support member, and said second portion being positioned around and supported by the outer surface of said cylindrical support member;

    retaining means for holding said coding member in place on said cylindrical support member; and

    at least one photo emitter element and at least one photo sensor element respectively located on either side of said coding track for directing light energy toward said coding track and sensing the light energy passing therethrough for generating an electrical signal which is thereby able to provide information as to shaft position and direction as well as timing information.

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