Diffractive waveguide providing structured illumination for object detection
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United States of America Patent
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Aug 8, 2017
Grant Date -
Oct 8, 2015
app pub date -
May 26, 2015
filing date -
Oct 9, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a diffractive waveguide device comprising: a light source, at least one light detector, an SBG device comprising a multiplicity of separately switchable SBG elements sandwiched between transparent substrate to which transparent electrodes have been applied. The substrates function as a light guide. Each SBG element encodes image information to be projected on an image surface. Each SBG element when in a diffracting state diffracts light out of the light guide to form an image region on an image surface. The light detector detects light scattered from an object disposed in proximity to the image surface and illuminated by said image region.
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International Classification(s)
- H01L:SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICE....
- G01J:MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTE....
- H04N:PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02B:OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- G03B:APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS O....
- G02F:DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF ....
- G03F:PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNE....
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