Diffractive waveguide providing structured illumination for object detection
AssigneeDigiLens Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern
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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.
Claims20
A diffractive waveguide device, comprising:
- a first light source emitting light of a first wavelength;
- at least one switchable SBG elements;
- transparent substrates sandwiching said SBG elements, said substrates together functioning as a first light guide;
- at least one light detector;
- and
- a means for coupling said first wavelength light into a total internal reflection path in said first light guide,
- wherein each said SBG element has a diffracting state and a non diffracting state, each said SBG element when in its diffracting state diffracts said first wavelength light to form a focused image region of predefined geometry and luminance distribution on an image surface,
- wherein each said SBG element encodes wavefront and phase information corresponding to said geometry and said luminance distribution,
- wherein said light detector is operative to detect light scattered from an object disposed in proximity to said image surface and illuminated by said image region.
Dependencies are inferred from the claim text.