Projection lens assembly and projector

Details Projection lens assembly and projector Projection lens assembly and projector

1995-08-08

1997-02-04

Epps, Georgia Y.

Optical: systems and elements

Lens

With field curvature shaping

359649, 359650, 359742, G02B 300, G02B 308

Patent

active

056004885

ABSTRACT:
A projection lens assembly having an imaging lens group, including a first lens group having a positive refractive power, a second lens group having a positive refractive power, and a Fresnel lens group having a positive refractive power and at least one Fresnel lens surface, in this order from the enlargement side. The projection lens assembly satisfies the relationships 1.4<f.sub.1 /f<2.8, and 1.5<f.sub.2 /f<6.0. In these relationships, f represents the focal length of the whole lens system, f.sub.1 the focal length of the first lens group, and f.sub.2 the focal length of the second lens group.

REFERENCES:
patent: 4756604 (1988-07-01), Nakatsuka et al.
patent: 4936657 (1990-06-01), Tejima et al.
patent: 5162844 (1992-11-01), Ueda
patent: 5170207 (1992-12-01), Tezuka et al.
patent: 5260831 (1993-11-01), Suzuki et al.
patent: 5268790 (1993-12-01), Chen
patent: 5390048 (1995-02-01), Miyatake et al.

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