Projecting apparatus for spreading non-diffracted light
AssigneeHimax Technologies Limited
InventorCheng-Hung Chi
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Abstract
The present invention provides a projecting apparatus. The projecting apparatus comprises: a light source, a lens, and a diffractive optical element (DOE). The light source is utilized for emitting a Gaussian beam. The lens has a focal length, and is utilized for receiving the Gaussian beam and generating a de-focused Gaussian beam, wherein a distance between the light source and the lens is not equal to the focal length. The DOE is designed for the de-focused Gaussian beam, and utilized for receiving the de-focused Gaussian beam and spreading out a non-diffracted light of the de-focused Gaussian beam.
Claims8
A projecting apparatus, comprising:
- a light source, for emitting a Gaussian beam;
- a lens, having a focal length, for receiving the Gaussian beam and generating a de-focused Gaussian beam, wherein a distance between the light source and the lens is not equal to the focal length;
- and
- a diffractive optical element (DOE), designed for the de-focused Gaussian beam, for receiving the de-focused Gaussian beam and spreading out a non-diffracted light of the de-focused Gaussian beam;
- wherein the DOE only spreads out a zero-order beam of the de-focused Gaussian beam on an image plane.
A projecting apparatus, comprising:
- a light source, for emitting a specific Gaussian beam;
- a diffractive optical element (DOE), designed for the specific Gaussian beam, for receiving the specific Gaussian beam and spreading out a non-diffracted light of the specific Gaussian beam;
- wherein the DOE only spreads out a zero-order beam of the specific Gaussian beam on an image plane.
Dependencies are inferred from the claim text.