Projection lens

Details Projection lens Projection lens

2006-01-24

2006-01-24

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S755000, C348S744000

Reexamination Certificate

active

06989946

ABSTRACT:
An object of the present invention is to suppress an influence due to temperature change and various aberrations. It is a projection lens which projects an image on a surface of a screen (magnified side). A first group I having a negative refractive power and a second group II having a positive refractive power are arranged in order from a magnified side toward a reduced side. The first group I is configured to arrange a first lens and a second lens in order from the magnified side, and the second group II is configured to arrange a third lens to a seventh lens. The first and second lenses are a negative meniscus lens whose both surfaces are formed by the aspherical surface in which an area near an optical axis of the surface on the magnified side is a concave surface. The third lens is a cemented lens in which a bi-concave lens is cemented to the surface on the reduced side of a bi-convex lens. The fourth lens is a positive meniscus lens whose both surfaces are formed by the aspherical surface, and a convex surface of the positive meniscus lens faces toward the reduced side. The fifth lens is the cemented lens in which the bi-concave lens is cemented to the surface on the reduced side of the bi-convex lens. The sixth lens is a positive lens whose strong convex surface faces toward the reduced side. The seventh lens is the positive lens whose both surfaces are a convex surface.

REFERENCES:
patent: 3804493 (1974-04-01), Matsubara
patent: 4682863 (1987-07-01), Simbal
patent: 5367405 (1994-11-01), Sado
patent: 2002/0060858 (2002-05-01), Wada
patent: 2003/0103268 (2003-06-01), Nishikawa et al.
patent: 2004/0233547 (2004-11-01), Sugano
patent: 2000-275515 (2000-10-01), None
patent: 2003-5069 (2003-01-01), None
patent: 2003-156683 (2003-05-01), None

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