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US 8,630,039 B2Granted
Optical designs for zero order reduction
AssigneePrimesense Ltd.
InventorAlexander Shpunt
Life of this patent
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Abstract
Apparatus for projecting a pattern includes a first diffractive optical element (DOE) configured to diffract an input beam so as to generate a first diffraction pattern on a first region of a surface, the first diffraction pattern including a zero order beam. A second DOE is configured to diffract the zero order beam so as to generate a second diffraction pattern on a second region of the surface such that the first and the second regions together at least partially cover the surface.
Claims16
Apparatus for projecting a pattern, comprising:
- a first diffractive optical element (DOE) configured to diffract an input beam so as to generate a first diffraction pattern on a first region of a surface, the first diffraction pattern comprising a zero order beam;
- and
- a second DOE, which comprises:
- an optically active region configured to receive the zero order beam and to diffract the zero order beam so as to generate a second diffraction pattern on a second region of the surface;
- and
- an optically inactive transparent region configured to transmit the first diffraction pattern absent the zero order beam so that the first diffraction pattern is unaltered by the optically inactive transparent region,
- such that the first and the second regions together at least partially cover the surface.
4 more elements
A method for projecting a pattern, comprising:
- diffracting an input beam with a first diffractive optical element (DOE) so as to generate a first diffraction pattern on a first region of a surface, the first diffraction pattern comprising a zero order beam;
- and
- diffracting the zero order beam with a second DOE, which comprises:
- an optically active region configured to receive and diffract the zero order beam so as to generate a second diffraction pattern on a second region of the surface;
- and
- an optically inactive transparent region configured to transmit the first diffraction pattern absent the zero order beam so that the first diffraction pattern is unaltered by the optically inactive transparent region,
- such that the first and the second regions together at least partially cover the surface.
4 more elements
Dependencies are inferred from the claim text.