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Pattern projector

  • US 9,400,177 B2
  • Filed: 04/19/2015
  • Issued: 07/26/2016
  • Est. Priority Date: 08/11/2010
  • Status: Active Grant
First Claim
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1. A pattern projector, comprising:

  • a light source, which is configured to emit a beam of light;

    a transparent substrate, which has a pair of mutually-opposed planar surfaces and is configured to receive and propagate the beam within the substrate by total internal reflection between the planar surfaces and which comprises a diffractive structure that is formed on one of the planar surfaces and is configured to direct at least a part of the beam to propagate out of the substrate in a direction that is angled away from the surface and to create a pattern comprising multiple interleaved light and dark areas; and

    at least one diffractive element through which light exiting the substrate through the diffractive structure passes on its way to a target,wherein the at least one diffractive element is configured to duplicate the pattern that is created by the diffractive structure formed on the one of the planar surfaces.

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