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POSITION LOCATING AND MAINTAINING METHOD AND MEANS

  • US 3,861,807 A
  • Filed: 08/17/1972
  • Issued: 01/21/1975
  • Est. Priority Date: 08/17/1972
  • Status: Expired due to Term
First Claim
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1. A device for establishing the location of a first object with respect to a second object comprising:

  • light source means for generating a diffuse beam of concentrically patterned light bearing a predetermined relationship to said first object and for applying same to said second object, said diffuse beam having a varying intensity from the center to the extremities thereof;

    a reflecting target substantially smaller in dimension than the diffuse beam of light mounted on said second object for reflecting a portion of the beam of concentrically patterned light, the intensity of the reflection being indicative of the position of said second object in the diffuse light beam;

    a light sensor for receiving the reflection of the target and for providing a signal proportional to its intensity; and

    control means responsive to the light intensity signal for indicating the locational relationship between the first and second objects.

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