Reverse-order crossed pancake lens with index gradient structure
AssigneeFacebook Technologies, LLC
InventorsGary Dean Sharp, Jacques Gollier
Life of this patent
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Abstract
In various embodiments, a reverse-order crossed pancake lens block having an index gradient structure may include an optical element configured to transmit at least a portion of radiation from a radiation source. Moreover, the pancake lens block may include an index-gradient structure that is spaced at a distance from the optical element, the distance configured to provide an optical path length in the pancake lens block. The index-gradient structure may be configured to provide an anti-reflective property to at least one surface of the optical element.
Claims20
A pancake lens block, comprising:
- an optical element configured to transmit at least a portion of radiation from a radiation source;
- and
- a first index-gradient structure spaced at a distance from the optical element, the distance configured to provide an optical path length in the pancake lens block;
- wherein the first index-gradient structure is configured to provide an anti-reflective property to at least one surface of the optical element.
A head mounted display (HMD) comprising:
- an electronic display configured to emit image light;
- and
- a pancake lens block comprising:
- an optical element configured to transmit at least a portion of the image light;
- and
- a first index-gradient structure spaced at a distance from the optical element;
- wherein:
- the distance is configured to provide an optical path length in the pancake lens block;
- and
- the first index-gradient structure is configured to provide an anti-reflective property to a surface of the optical element.
A method comprising:
- configuring an optical element within a pancake lens block to transmit at least a portion of radiation from a radiation source;
- and
- spacing a first index-gradient structure at a distance from the optical element, wherein:
- the distance is configured to provide an optical path length in the pancake lens block;
- and
- the first index-gradient structure is configured to provide an anti-reflective property to a surface of the optical element.
Dependencies are inferred from the claim text.