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Composite sensor for door

  • US 7,064,666 B2
  • Filed: 02/05/2004
  • Issued: 06/20/2006
  • Est. Priority Date: 02/06/2003
  • Status: Expired due to Fees
First Claim
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1. A composite sensor for a door, comprising:

  • a radio-wave transmitter-receiver section for forming a radio-wave detection zone for detecting an object at a location remote from said door; and

    a light emitter-receiver section for forming an optical detection zone for detecting an object at a location along and closer to said door;

    said light emitter-receiver section including optical detection zone modifying means which fixes the position of an edge closer to said door of said optical detection zone and moves an edge remote from said door of said optical detection zone in a direction perpendicular to said door to thereby increase or decrease a dimension of said optical detection zone in the direction perpendicular to said door.

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