Projection lens system for image projection apparatus

Details Projection lens system for image projection apparatus Projection lens system for image projection apparatus

2006-07-11

2006-07-11

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S708000

Reexamination Certificate

active

07075727

ABSTRACT:
A projection lens system for an image projection apparatus that enhances the image aberration correction rate to achieve high resolution and luminance. The lens system includes a first lens group having first and second spherical lenses of positive refraction power movable along an optical axis, a second lens group having a third doublet lens formed with a lens of positive refraction power and a lens of negative refraction power in junction to correct chromatic aberration, and a fourth spherical lens to correct spherical aberration, a third lens group having lenses of positive refraction power, and a fourth lens group for correcting distortions having a seventh spherical lens being concave on both surfaces thereof, an eighth spherical lens of negative refraction power having a concave surface on one side and a convex surface on the other side, and a ninth lens of negative refraction power having an aspheric surface.

REFERENCES:
patent: 5914820 (1999-06-01), Takimoto et al.
patent: 6275343 (2001-08-01), Takamoto et al.
patent: 6476981 (2002-11-01), Shikama
patent: 6542316 (2003-04-01), Yoneyama

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