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Optical encoder with a shutter clutched for directional movement

  • US 4,533,830 A
  • Filed: 12/16/1982
  • Issued: 08/06/1985
  • Est. Priority Date: 12/16/1982
  • Status: Expired due to Fees
First Claim
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1. The improvement in an optical disc encoder of the type having a disc, with apertures therein, which interrupts a light source in a pulsed manner as the disc turns in order to provide for pulsed light reception by light sensors to indicate the radial movement of the disc, wherein the improvement comprises:

  • at least two light sensors on one side of the disc having an optical path in relationship to the light source that is interrupted by said disc; and

    ,shutter means clutched for directional movement with respect to said disc that close off one light sensor when the disc moves in one direction and closes off a second light sensor when the disc moves in the other direction in order to accommodate the output on either light sensor corresponding to the direction of rotational movement of said disc.

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