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Proximity detector

  • US 20070127039A1
  • Filed: 11/12/2004
  • Published: 06/07/2007
  • Est. Priority Date: 11/19/2003
  • Status: Active Grant
First Claim
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1. Apparatus for detecting proximity between a first object (target object) and a second object (reference object), comprising a light source (1) and a light detector (3) adapted to receive resulting back-scattered light from the reference object when illuminated from the light source (1), whereby the intensity of back-scattered light to the light detector (3) is utilized as a measure of said proximity, characterized in that the target object (2) comprises an optical device (4) having a focal plane (7) and being adapted to be illuminated by the light source (1), that the axes of the light rays from the light source (1) and the back-scattering to the light detector (3) have mutually closely adjacent and substantially parallel or coincident portions, and that said proximity corresponds to a spacing (relative position) between the target object (2) and the reference object (6,8) wherein the reference object is located substantially at the focal plane.

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