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Tennis court boundary sensor

  • US 5,059,944 A
  • Filed: 08/02/1989
  • Issued: 10/22/1991
  • Est. Priority Date: 08/02/1989
  • Status: Expired due to Fees
First Claim
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1. A out-of-bounds sensor for ball courts defined by boundary lines comprising:

  • at least one first light emitter providing a first light beam substantially parallel to a boundary line;

    at least one first light receptor which is collinear to said first light beam for receiving said first light beam;

    at least one second light emitter providing a second light beam substantially parallel to said first light beam, wherein said second light beam is elevated above said first light beam for disabling said first light emitter when said second light beam is interfered;

    at least one second light receptor which is collinear to said second light for receiving said second light beam; and

    at least one timing circuit coupled to said first light receptor for determining the duration of interference in said first light beam;

    wherein said first light emitter and said first receptor are a plurality of light emitters and receptors providing the first light beam as substantially parallel light beams forming a first plane parallel to a surface of said ball court, andwherein said second light emitter and said second receptor are a plurality of light emitters and receptors providing the second light beam as substantially parallel light beams forming a second plane parallel to and above said first plane.

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