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Photoelectric sensor

  • US 20040089791A1
  • Filed: 10/15/2003
  • Published: 05/13/2004
  • Est. Priority Date: 11/08/2002
  • Status: Active Grant
First Claim
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1. A photoelectric sensor for detecting the presence/absence of an object in a detection area where a light-emitting area of a light-emitting device and a light-receiving area of a light-receiving device are overlapped with each other, the photoelectric sensor comprising:

  • a power supply unit that outputs a driving current of the light-emitting device such that its current value is variable; and

    a control unit that controls the power supply unit in order to change in magnitude of the driving current of the light-emitting device.

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