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Automatic control using proximity sensors

  • US 5,075,632 A
  • Filed: 11/02/1989
  • Issued: 12/24/1991
  • Est. Priority Date: 10/15/1984
  • Status: Expired due to Fees
First Claim
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1. Promixity sensor apparatus comprising:

  • a plurality of antennae, receiving a plurality of signals; and

    processing means operable for receiving and processing said plurality of signals picked up by respective ones of the antennae and for generating an output response in relation to the signals received, the processing means including;

    (a) first selection means for selecting a maximum signal from among the plurality of signals received,(b) second selection means for selecting a minimum signal from among the plurality of signals received,(c) threshold selection means for automatically selecting a threshold level having a smallest value from a plurality of threshold levels, where each threshold level corresponds to a condition for which an output signal may be generated, one of the threshold levels being derived from a selected maximum threshold signal and the threshold selection means being operable to select said minimum threshold level from said plurality of threshold levels including a threshold corresponding to the selected maximum signal and other threshold levels, one or more of the other threshold levels being adjustable to a fixed level, and(d) comparison means for comparing the selected minimum signal with the selected threshold level and for generating an output signal when the selected minimum signal exceeds the selected threshold level, one of the threshold levels being derived from a selected maximum threshold signal and the threshold selection means being operable to select a minimum threshold level from a threshold corresponding to the selected maximum signal and other threshold levels, one or more of the other threshold levels being adjustable to a fixed level.

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