PROJECTION OPTICAL SYSTEM AND IMAGE DISPLAY APPARATUS
First Claim
1. A projection optical system comprising:
- a projector lens including a plurality of lenses;
a first mirror; and
a second mirror formed of a concave mirror, whereina lens surface of one of the lenses located closest to the first mirror is convex, whereina projection luminous flux passing through the projector lens to be incident on the first mirror is a luminous flux exhibiting divergence, and whereinthe projection luminous flux reflected off the second mirror after having reflected off the first mirror is converged once, and the once converged projection luminous flux is then projected onto a projection surface.
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Abstract
A projection optical system for use in an image display apparatus having an illumination optical system applying light from a light source, and an image display device receiving the light from the illumination optical system to form a projection image includes a projector lens composed of plural lenses, a first mirror, and a second mirror formed of a concave mirror. The projection optical system is configured to project the projection image onto a projection surface. A projection luminous flux passing through the projector lens to be incident on the first mirror is a luminous flux exhibiting divergence. The projection luminous flux reflected off the second mirror after having reflected off the first mirror is converged once, and the once converged projection luminous flux is projected onto the projection surface. A lens surface of a lens located closest to the first mirror among the lenses of the projector lens is convex.
28 Citations
20 Claims
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1. A projection optical system comprising:
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a projector lens including a plurality of lenses; a first mirror; and a second mirror formed of a concave mirror, wherein a lens surface of one of the lenses located closest to the first mirror is convex, wherein a projection luminous flux passing through the projector lens to be incident on the first mirror is a luminous flux exhibiting divergence, and wherein the projection luminous flux reflected off the second mirror after having reflected off the first mirror is converged once, and the once converged projection luminous flux is then projected onto a projection surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A projection optical system comprising:
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a lens optical system including a plurality of lens groups; and a mirror optical system including a first mirror, and a second mirror formed of a concave mirror, wherein a projection luminous flux passing through the lens optical system is incident on the first mirror, and the projection luminous flux reflected off the second mirror after having been reflected off the first minor is projected on a projection surface, and wherein an intermediate image is formed between the lens optical system and the second mirror, and a part of the intermediate image is formed between the lens optical system and the first mirror. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification