Projection type display apparatus

Details Projection type display apparatus Projection type display apparatus

2007-02-13

2007-02-13

Nguyen, Thong Q (Department: 2872)

Optical: systems and elements

Compound lens system

With relay

C359S619000, C359S649000

Reexamination Certificate

active

11268782

ABSTRACT:
A projection type display apparatus, wherein a common case can be used for housing an illumination optical system even when a shape of an image display element and an optical path length in a prism are different, is provided: wherein a light source for emitting an illumination light, an image display device, an illumination optical system for irradiating the illumination light from the light source to the image display device, and a projection optical system for projecting an image formed by said image display device are provided; the illumination optical system comprises a first fly-eye lens and a second fly-eye lens arranged at each other's focal points, a first lens group and a second lens group arranged over a mirror for bending an optical path; the first and second lens groups have a same focal length but a different back focus; and predetermined condition formulas are satisfied.

REFERENCES:
patent: 5867319 (1999-02-01), Sugiyama et al.
patent: 7066602 (2006-06-01), Lee et al.
patent: 07-161601 (1995-06-01), None
patent: 2000-187178 (2000-07-01), None
patent: 2000-321529 (2000-11-01), None

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