OPTICAL DEVICE AND IMAGE DISPLAY APPARATUS
First Claim
Patent Images
1. An optical device, comprising:
- a light guide;
a first diffraction optical element which makes light incident on the light guide;
a second diffraction optical element which emits the light from the light guide; and
a reflection layer provided on a second surface of the light guide which intersects with a first surface of the light guide provided with the first diffraction optical element or the second diffraction optical element,wherein protruded portions which respectively constitute the first diffraction optical element and the second optical element are respectively inclined in a first direction which is the same as a normal line direction of the first surface.
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Abstract
A first diffraction optical element is disposed on a light incident surface of a light guide, a second diffraction optical element is disposed on a light emitting surface of the light guide, and a reflection layer is disposed on an end surface of the light guide. A diffraction grating of the first diffraction optical element and a diffraction grating of the second diffraction optical element has an inclined portion respectively. The inclined portion of the first diffraction optical element and the inclined portion of the second diffraction optical element are inclined in same direction.
26 Citations
17 Claims
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1. An optical device, comprising:
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a light guide; a first diffraction optical element which makes light incident on the light guide; a second diffraction optical element which emits the light from the light guide; and a reflection layer provided on a second surface of the light guide which intersects with a first surface of the light guide provided with the first diffraction optical element or the second diffraction optical element, wherein protruded portions which respectively constitute the first diffraction optical element and the second optical element are respectively inclined in a first direction which is the same as a normal line direction of the first surface. - View Dependent Claims (2, 3, 6, 12)
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4. An optical device, comprising:
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a light guide; a first diffraction optical element which makes light incident on the light guide; a second diffraction optical element which emits the light from the light guide; and a reflection layer provided on a second surface of the light guide which intersects with a first surface of the light guide provided with the first diffraction optical element and the second diffraction optical element, wherein a first portion and a second portion which respectively constitute the first diffraction optical element and the second diffraction optical element and have different refractive indexes from each other, are respectively inclined in the first direction which is the same as the normal line direction of the first surface. - View Dependent Claims (5, 13)
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7. An optical device, comprising:
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a light guide; a first diffraction optical element which diffracts light incident on the light guide; a second diffraction optical element which diffracts and emits the light guided from the light guide; and a reflection layer provided on a second surface of the light guide which intersects with a first surface of the light guide provided with the first diffraction optical element or the second diffraction optical element, wherein a first portion and a second portion which respectively constitute the first diffraction optical element and the second diffraction optical element and have different refractive indexes from each other, are respectively inclined in the first direction which is the same as the normal line direction of the first surface. - View Dependent Claims (8, 14)
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9. An optical device, comprising:
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a first light guide; a first diffraction optical element which makes light incident on the first light guide; a second diffraction optical element which emits the light from the first light guide; a first reflection layer provided on a second surface of the light guide which intersects with a first surface of the light guide provided with the first diffraction optical element or the second diffraction optical element; a second light guide; a third diffraction optical element which makes light incident on the second light guide; a fourth diffraction optical element which emits the light from the second light guide; and a second reflection layer provided on a fourth surface of the light guide which intersects with a third surface of the light guide provided with the third diffraction optical element or the fourth diffraction optical element, wherein protruded portions which constitute the first diffraction optical element and the second optical element are respectively inclined in a first direction which is the same as a normal line direction of the first surface, and wherein protruded portions which constitute the third diffraction optical element and the fourth optical element are respectively inclined in a second direction which is the same as the normal line direction of the third surface. - View Dependent Claims (15)
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10. An optical device, comprising:
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a first light guide; a first diffraction optical element which makes light incident on the first light guide; a second diffraction optical element which emits the light from the first light guide; a first reflection layer provided on a second surface of the light guide which intersects with a first surface of the light guide provided with the first diffraction optical element or the second diffraction optical element; a second light guide; a third diffraction optical element which makes light incident on the second light guide; a fourth diffraction optical element which emits the light from the second light guide; and a second reflection layer provided on a fourth surface of the light guide which intersects with a third surface of the light guide provided with the third diffraction optical element or the fourth diffraction optical element, wherein a first portion and a second portion which respectively constitute the first diffraction optical element and the second diffraction optical element and have different refractive indexes from each other, are inclined in a first direction which is the same as a normal line direction of the first surface, respectively, and wherein a third portion and a fourth portion which respectively constitute the third diffraction optical element and the fourth diffraction optical element and have different refractive indexes from each other, are respectively inclined in a second direction which is the same as the normal line direction of the third surface. - View Dependent Claims (16)
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11. An optical device, comprising:
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a first light guide; a first diffraction optical element which diffracts light incident on the first light guide; a second diffraction optical element which diffracts and emits the light guided from the first light guide; a first reflection layer provided on a second surface of the light guide which intersects with a first surface of the light guide provided with the first diffraction optical element or the second diffraction optical element; a second light guide; a third diffraction optical element which diffracts light incident on the second light guide; a fourth diffraction optical element which diffracts and emits the light from the second light guide; and a second reflection layer provided on a fourth surface of the light guide which intersects with a third surface of the light guide provided with the second diffraction optical element or the third diffraction optical element, wherein a first portion and a second portion which respectively constitute the first diffraction optical element and the second diffraction optical element and have different refractive indexes from each other, are inclined in a first direction which is the same as a normal line direction of the first surface, respectively, and wherein a third portion and a fourth portion which respectively constitute the third diffraction optical element and the fourth diffraction optical element and have different refractive indexes from each other, are respectively inclined in a second direction which is the same as the normal line direction of the third surface. - View Dependent Claims (17)
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Specification