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Encoder

  • US 20050199791A1
  • Filed: 03/09/2005
  • Published: 09/15/2005
  • Est. Priority Date: 03/12/2004
  • Status: Active Grant
First Claim
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1. An encoder for detecting the amount of movement of a movable object having a plurality of slits, the encoder comprising:

  • a light emitting device for emitting light toward the object so that the emitted light is passable through the slits of the object;

    a detector for receiving the emitted light of the light emitting device that passes through the slits and for generating an ON signal when the amount of emitted light exceeds a threshold value; and

    a current increasing circuit for increasing the amount of current flowing through the light emitting device when the detector generates the ON signal.

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