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Protective zone device for a vehicle

  • US 4,668,859 A
  • Filed: 06/06/1985
  • Issued: 05/26/1987
  • Est. Priority Date: 06/26/1984
  • Status: Expired due to Fees
First Claim
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1. Apparatus for forming a protective zone immediately forward of a vehicle travelling along a path, the apparatus comprising a light transmitter for directing a light beam into the protective zone, a light receiver for detecting light from the beam reflected from the protective zone, an electronic processing circuit operatively coupled with the light receiver for generating a control signal for stopping the vehicle when a change in the reflected light is detected by the light receiver the light transmitter including means for directing the light beam at a first fixed angle obliquely onto the path of travel from above, means for scanning the light beam from the transmitter about an axis perpendicular to the path of travel the receiver being positioned so that light reflected by the plane of the zone and detected by the receiver is at a second fixed angle which is different from said first fixed angle and means for scanning the light beam from the receiver synchronously with the light beam from the transmitter.

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