Patent ID: 9400177
Filing Date: 2016-07-26
CPC Classification: G01B,G01S,G02B

Claim Text:
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.