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Door sensor with self-diagnosing function

  • US 5,828,302 A
  • Filed: 04/24/1997
  • Issued: 10/27/1998
  • Est. Priority Date: 04/26/1996
  • Status: Expired due to Term
First Claim
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1. A door sensor with a self-diagnosing function, for sensing an object approaching a door panel and actuating the door panel in response to the sensing of the object, comprising:

  • a light-emitting unit emitting light into a space or onto a floor near said door panel;

    a light-receiving unit receiving light emitted by said light-emitting unit and reflected from an object in said space or on said floor or from said floor; and

    a control unit determining the presence of an object on the basis of the amount of light received by said light-receiving unit, said control unit being adapted to supply, to a door controller which controls the opening and closing of said door panel, a door controller enabling signal for opening said door panel when the presence of an object is determined;

    wherein said control unit includes a plurality of failure detecting means for detecting failure in portions of said light-emitting unit, light-receiving unit and control unit, and develops continuously said door controller enabling signal when one of said failure detecting means detects failure in any of said portions.

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