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Automatic door sensor and automatic door system equipped with this sensor

  • US 6,812,837 B2
  • Filed: 11/20/2002
  • Issued: 11/02/2004
  • Est. Priority Date: 11/22/2001
  • Status: Expired due to Term
First Claim
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1. An automatic door sensor operable to transmit a door open signal to an automatic door opening/closing mechanism so as to open an automatic door when an object enters a prescribed area around a doorway opening of the automatic door, and to discontinue transmission of the door open signal to the automatic door opening/closing mechanism so as to close the automatic door by a first closing action when the object leaves the prescribed area,wherein said sensor comprises an open/close controller operable to transmit a presence detection signal to the automatic door opening/closing mechanism when the object remains stationary within the prescribed area for a certain period of time so as to close the automatic door by a second closing action which is different from the first closing action.

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