Projection type image display apparatus
AssigneeKonica Minolta Opto, Inc.
InventorsAtsushi Matsuura, Kohtaro Hayashi, Jun Ishihara, Masayuki Imaoka
Life of this patent
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Abstract
An projection type image display apparatus includes a projection optical system having a plurality of concave mirrors and digital micromirror device (DMD). An optical path from the DMD to the concave mirror closest to the DMD is a sealed space which is surrounded by an image forming device holding plate holding the DMD, an optical component holding member holding the concave mirror and the image forming device holding plate, and a cover glass (transparent dust-proof cover) arranged on the optical path from the DMD to the concave mirror closest to the DMD.
Claims19
A projection type image display apparatus comprising:
- an image forming device forming an image;
- a projection optical system for projecting the image onto a screen, having a plurality of curved mirrors;
- an optical component holding member holding the image forming device;
- a transparent dust-proof cover arranged on an optical path between the image forming device and the curved mirror closest to the image forming device, the transparent dust-proof cover being held to the optical component holding member;
- and
- a sealed structure sealing at least a space between the image forming device and the transparent dust-proof cover.
A projection type image display apparatus comprising:
- an image forming device forming an image;
- a projection optical system for projecting the image onto a screen, having a plurality of curved mirrors;
- an optical component holding member holding the image forming device and the curved mirrors;
- and
- a transparent dust-proof cover arranged on an optical path between the image forming device and the curved mirror closest to the image forming device, the transparent dust-proof cover being held to the optical component holding member,
- wherein the optical component holding member seals a space between the transparent dust-proof cover and the image forming device.
An unit for a projection type image display apparatus comprising:
- an optical component holding member holding a concave mirror and having a portion to which an image forming device holder for holding a image forming device is fixed;
- and
- a transparent dust-proof cover arranged on an optical path between the image forming device and the concave mirror, the transparent dust-proof cover being held to the optical component holding member,
- wherein the optical component holding member seals a space between the image forming device and the dust-proof cover.
Dependencies are inferred from the claim text.