Projection lens system and projector

Details Projection lens system and projector Projection lens system and projector

2006-10-10

2006-10-10

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S663000, C359S733000

Reexamination Certificate

active

07119966

ABSTRACT:
A projection lens system that projects projection light from a light modulator onto a screen and which is telecentric on an input side is provided. The projection lens system comprises a first meniscus lens that is disposed closest to the screen, is convex on a screen side, and has negative refractive power; and a second meniscus lens that is disposed next closest to the screen, is convex on a screen side, and has negative refractive power. The first meniscus lens is made of plastic and at least one out of two curved surfaces thereof is aspherical, and a refractive power of the first meniscus lens is lower than a refractive power of the second meniscus lens. In the projection lens system, far superior aberration-correcting performance can be achieved and a drop in aberration-correcting performance due to thermal deformation can be prevented.

REFERENCES:
patent: 5666228 (1997-09-01), Yamamoto
patent: 5946144 (1999-08-01), Yamamoto
patent: 6084719 (2000-07-01), Sugawara et al.
patent: 02-228620 (1990-09-01), None
patent: 2002-357769 (2002-12-01), None
patent: 2002-365534 (2002-12-01), None
patent: 2002-365537 (2002-12-01), None

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