Low-profile beam splitter
First Claim
1. An optical device comprising:
- a first surface comprising a transmissive diffractive optical element;
a second surface normal to the first surface; and
a third surface arranged at an angle to the second surface, the third surface being reflective to light of a first state and transmissive to light of a second state,wherein the transmissive diffractive optical element is configured to receive a collimated input beam that is normally incident on the first surface, the collimated input beam comprising light having the first state, and to convert the collimated input beam into at least a first diffracted beam at a first diffraction angle such that the first diffracted beam is directed toward the third surface and is reflected by the third surface in a direction substantially parallel to the first surface.
3 Assignments
0 Petitions
Accused Products
Abstract
Examples of light projector systems for directing input light from a light source to a spatial light modulator are provided. For example, an optical device is disclosed which includes a first surface having a diffractive optical element, a second surface normal to the first surface, and a third surface arranged at an angle to the second surface. The third surface may be a beam splitting surface that is reflective to light of a first state and transmissive to light of a second state. The diffractive optical element may receive an input beam made up of light having the first state, and convert the input beam into at least a first diffracted beam at a first diffraction angle such that the first diffracted beam is directed toward the third surface and is reflected by the third surface in a direction substantially parallel to the first surface.
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Citations
54 Claims
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1. An optical device comprising:
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a first surface comprising a transmissive diffractive optical element; a second surface normal to the first surface; and a third surface arranged at an angle to the second surface, the third surface being reflective to light of a first state and transmissive to light of a second state, wherein the transmissive diffractive optical element is configured to receive a collimated input beam that is normally incident on the first surface, the collimated input beam comprising light having the first state, and to convert the collimated input beam into at least a first diffracted beam at a first diffraction angle such that the first diffracted beam is directed toward the third surface and is reflected by the third surface in a direction substantially parallel to the first surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An optical device comprising:
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a first surface comprising a reflective diffractive optical element; a second surface normal to the first surface; and a third surface arranged at an angle to the second surface, the third surface being reflective to light of a first state and transmissive to light of a second state; wherein the reflective diffractive optical element is configured to receive a diverging input beam, the diverging input beam comprising light having the first state, and to convert the diverging input beam into at least a first collimated and diffracted beam at a first diffraction angle such that the first collimated and diffracted beam is directed toward the third surface and is reflected by the third surface in a direction substantially parallel to the first surface. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A head mounted display (HMD) configured to be worn on a head of a user, the HMD comprising:
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a frame; projection optics supported by the frame and configured to project an image to an eye of the user; and a light projector system in optical communication with the projection optics, the light projector system configured to provide modulated light encoded with the image, the light projector system comprising; a light source to emit an input beam; an optical device comprising; a first surface with a diffractive optical element, a second surface normal to the first surface, and a third surface arranged at an angle to the second surface, the third surface being reflective to light of a first state and transmissive to light of a second state, wherein the diffractive optical element is configured to receive the input beam, the input beam comprising light having the first state, and to convert the input beam into at least a first diffracted beam at a first diffraction angle such that the first diffracted beam is directed toward the third surface and is reflected by the third surface in a direction substantially parallel to the first surface; and a spatial light modulator configured to produce the modulated light using the input beam delivered to the spatial light modulator by the optical device. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46)
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47. An optical device comprising:
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a first surface comprising a diffractive optical element; a second surface normal to the first surface; and a third surface arranged at an angle to the second surface, the third surface being reflective to light of a first state and transmissive to light of a second state, wherein the diffractive optical element is configured to receive an input beam, the input beam comprising light having the first state, and to convert the input beam into at least a first diffracted beam at a first diffraction angle such that the first diffracted beam is directed toward the third surface and is reflected by the third surface in a direction substantially parallel to the first surface. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54)
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Specification