Projection lens apparatus and rear projection type image...

Details Projection lens apparatus and rear projection type image... Projection lens apparatus and rear projection type image...

2008-07-29

2008-07-29

Fuller, Rodney E (Department: 2862)

Optics: image projectors

Particular condenser

C359S649000

Reexamination Certificate

active

07404646

ABSTRACT:
A projection lens apparatus includes a plurality of lenses, for enlarging and projecting, onto a screen, an original image displayed on an image generation source. The plurality of lenses are arranged, beginning with the lens nearest the screen, as first to sixth lens groups. The fourth lens group includes one meniscus lens that has a positive refracting power and has a concave lens surface directed toward the screen. The concave lens surface of the meniscus lens included in the fourth group lens has a curvature in the vicinity of an outer portion of the concave lens surface that is smaller than a curvature in a predetermined area of the concave lens surface defined between a light axis of the concave lens surface of the meniscus lens and the smaller curvature of the concave lens surface in the vicinity of the outer portion of the concave lens surface.

REFERENCES:
patent: 5808804 (1998-09-01), Moskovich
patent: 5870234 (1999-02-01), Ebbesmeier nee Schitthof
patent: 5946142 (1999-08-01), Hirata et al.
patent: 6445512 (2002-09-01), Moskovich
patent: 9-90219 (1997-04-01), None
patent: 9-159914 (1997-06-01), None
patent: 11-344668 (1999-12-01), None

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