Projection optical system and image display apparatus
First Claim
1. A projection optical system for an image display apparatus including an image display device and configured to project a projection image formed by the image display device onto a projection surface, comprising:
- a refractive optical lens system having a positive refractive power and including a plurality of lenses;
a first mirror; and
a second mirror formed of a concave mirror, whereinthe refractive optical lens system includes one optical axis shared by all lenses of the plurality of lenses, and the optical axis is parallel to the projection surface,a lens surface located closest to the first mirror is convex, anda first light beam which reaches a position closest to an image display surface of the image display device on the projection surface and a second light beam which reaches a position farthest from the image display surface of the image display device on the projection surface are reflected by the second mirror, and then intersect at a position closer to the first mirror than the second mirror in a plane including the optical axis and perpendicular to the projection surface.
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Accused Products
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.
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Citations
16 Claims
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1. A projection optical system for an image display apparatus including an image display device and configured to project a projection image formed by the image display device onto a projection surface, comprising:
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a refractive optical lens system having a positive refractive power and including a plurality of lenses; a first mirror; and a second mirror formed of a concave mirror, wherein the refractive optical lens system includes one optical axis shared by all lenses of the plurality of lenses, and the optical axis is parallel to the projection surface, a lens surface located closest to the first mirror is convex, and a first light beam which reaches a position closest to an image display surface of the image display device on the projection surface and a second light beam which reaches a position farthest from the image display surface of the image display device on the projection surface are reflected by the second mirror, and then intersect at a position closer to the first mirror than the second mirror in a plane including the optical axis and perpendicular to the projection surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A projection optical system for an image display apparatus including an image display device and configured to project a projection image formed by the image display device onto a projection surface, comprising:
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a refractive optical lens system having a positive refractive power and including a plurality of lenses; a first mirror; and a second mirror formed of a concave mirror, wherein the refractive optical lens system includes one optical axis shared by all lenses of the plurality of lenses, and the optical axis is parallel to the projection surface, a lens surface located closest to the first mirror is convex, and a first light beam which is corresponding to a pixel closest to the optical axis in a plane including the optical axis and perpendicular to the projection surface and a second light beam which is corresponding to a pixel farthest from the optical axis in the plane are reflected by the second mirror, and then intersect at a position closer to the first mirror than the second mirror in the plane. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification