Projection optical system and image projection apparatus

Details Projection optical system and image projection apparatus Projection optical system and image projection apparatus

2006-10-03

2006-10-03

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S680000, C359S691000, C359S725000

Reexamination Certificate

active

07116498

ABSTRACT:
A projection optical system and an image projection apparatus that are small in size and can achieve projection with a wide angle while a good image forming performance is assured includes a first lens group having a negative refracting power and a second lens group also having a negative refracting power. The first and second lens groups are arranged in order from the projection side. The first lens group includes a negative meniscus lens that has a concave surface directed to the projection side and formed as an aspherical reflecting surface.

REFERENCES:
patent: 5042929 (1991-08-01), Tanaka et al.
patent: 5390048 (1995-02-01), Miyatake et al.
patent: 6144503 (2000-11-01), Sugano

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