Image display apparatus
First Claim
1. An image display apparatus, comprising:
- an image display device comprising a reflection-type image display device which displays an image by reflection of illumination light;
an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system; and
illumination means, arranged outside an optical path between the reflection-type image display device and the eye point of the observer, for forming the illumination light, wherein the decentered optical system comprises at least one reflecting surface which is a rotationally asymmetric surface having no axis of rotational symmetry, wherein the rotationally asymmetric surface is a plane-symmetry three-dimensional surface having only one plane of symmetry.
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Accused Products
Abstract
A compact, lightweight and bright image display apparatus which uses a non-telecentric optical system, or a decentered optical system and a reflection-type image display device, such as a reflection-type LCD, to have high optical performance. The image display apparatus comprises an image display device, and an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image. The ocular optical system comprises a decentered optical system having at least one decentered back-coated reflecting surface. The image display device is a reflection-type image display device which displays an image by reflection of illumination light. An illumination means for forming the illumination light is arranged outside an optical path between the reflection-type image display device and the eye point of the observer.
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Citations
22 Claims
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1. An image display apparatus, comprising:
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an image display device comprising a reflection-type image display device which displays an image by reflection of illumination light;
an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system; and
illumination means, arranged outside an optical path between the reflection-type image display device and the eye point of the observer, for forming the illumination light, wherein the decentered optical system comprises at least one reflecting surface which is a rotationally asymmetric surface having no axis of rotational symmetry, wherein the rotationally asymmetric surface is a plane-symmetry three-dimensional surface having only one plane of symmetry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image display apparatus, comprising:
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an image display device; and
an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system having at least one decentered back-coated reflecting surface, and the decentered optical system being a non-telecentric optical system, wherein the image display device comprises a scanning member for at least one of one-dimensional scanning and two-dimensional scanning, and illuminating means formed so that a two-dimensional image is formed by the scanning of said scanning member, and wherein a numerical aperture reducing member is arranged between the illuminating means and the decentered optical system to prevent a ghost.
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11. An image display apparatus, comprising:
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an image display device; and
an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system, wherein the decentered optical system has at least an entrance surface, a reflecting surface and an exit surface which surround a medium having a refractive index larger than 1, and wherein said reflecting surface is a decentered curved surface of a back-coated reflecting mirror, wherein the image display device comprises a scanning member for at least one of one-dimensional scanning and two-dimensional scanning, and illuminating means formed so that a two-dimensional image is formed by the scanning of said scanning member, and wherein a numerical aperture reducing member is arranged between the illuminating means and the decentered optical system to prevent a ghost.
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12. An image display apparatus, comprising:
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an image display device; and
an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system having at least one decentered back-coated reflecting surface, and the decentered optical system being a non-telecentric optical system, wherein the image display device comprises a reflection-type image display device which displays an image by reflection of illumination light, and wherein illumination means for forming the illumination light is arranged outside an optical path between the reflection-type image display device and the eye point of the observer, and wherein a numerical aperture reducing member is arranged between said illuminating means and said decentered optical system to prevent a ghost.
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13. An image display apparatus, comprising:
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an image display device; and
an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system, wherein the decentered optical system has at least an entrance surface, a reflecting surface and an exit surface which surround a medium having a refractive index larger than 1, and wherein said reflecting surface is a decentered curved surface of a back-coated reflecting mirror, wherein the image display device comprises a reflection-type image display device which displays an image by reflection of illumination light, and wherein illumination means for forming the illumination light is arranged outside an optical path between the reflection-type image display device and the eye point of the observer, and wherein a numerical aperture reducing member is arranged between said illuminating means and said decentered optical system to prevent a ghost.
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14. An image display apparatus, comprising:
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an image display device comprising a reflection-type image display device which displays an image by reflection of illumination light;
an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system; and
an illuminator arranged outside an optical path between the reflection-type image display device and the eye point of the observer, wherein the decentered optical system comprises at least one reflecting surface which is a rotationally asymmetric surface having no axis of rotational symmetry, wherein the rotationally asymmetric surface is a plane-symmetry three-dimensional surface having only one plane of symmetry. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification