×

Passive vehicle presence detection system

  • US 5,166,681 A
  • Filed: 07/30/1990
  • Issued: 11/24/1992
  • Est. Priority Date: 07/30/1990
  • Status: Expired due to Fees
First Claim
Patent Images

1. In a passive optical system for use in a host vehicle for detecting the presence of one or more target vehicles in an area of surveillance, comprisingat least one tubular sensor member mounted on the host vehicle and arranged with its longitudinal axis directed to the area of surveillance in which the target vehicle may intrude, said tubular sensor member having a light sensitive device including at least one light sensitive cell mounted interiorly thereof at one end and being adapted for sensing the light variations of light rays entering and projecting through said member in response to one or more target vehicles intruding into the area of surveillance, said cell being adapted for producing a signal in accordance with variations thereof and therefore the presence of one or more target vehicles, said member also being formed with means for directing and focusing light rays emanating from the area of surveillance, through said member and upon said at least one light sensitive cell.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×