Reverse-order crossed pancake lens with azimuthal compensation
AssigneeFacebook Technologies, LLC
InventorGary Dean Sharp
Life of this patent
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Abstract
In various embodiments, a pancake lens block (e.g., a reverse order crossed pancake lens block) including azimuthal compensation may include an optical element configured to transmit at least a portion of light emitted by an electronic display. The pancake lens block may further include an azimuthal compensator coupled to a surface of the optical element. Moreover, the azimuthal compensator may include a uniaxial birefringent material, and the azimuthal compensator may be configured to reduce an optical effect of stress birefringence in 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
- an azimuthal compensator coupled to a surface of the optical element;
- wherein:
- the azimuthal compensator comprises a uniaxial birefringent material;
- and
- the azimuthal compensator is configured to reduce an optical effect of stress birefringence in the optical element.
A head mounted display (HMD) comprising:
- an electronic display configured to emit light;
- and
- a pancake lens block comprising:
- an optical element configured to transmit at least a portion of the light emitted by the electronic display;
- and
- an azimuthal compensator coupled to a surface of the optical element;
- wherein:
- the azimuthal compensator comprises a uniaxial birefringent material;
- and
- the azimuthal compensator is configured to reduce an optical effect of stress birefringence in the optical element.
A method of assembling a pancake lens block, the method comprising:
- positioning an optical element to transmit at least a portion of light from a radiation source;
- and
- coupling an azimuthal compensator to a surface of the optical element;
- wherein:
- the azimuthal compensator comprises a uniaxial birefringent material;
- and
- the azimuthal compensator is configured to reduce an optical effect of stress birefringence in the optical element.
Dependencies are inferred from the claim text.