Projection lens system

Details Projection lens system Projection lens system

1991-02-04

1992-07-28

Howell, Janice A.

Optical: systems and elements

Lens

359648, G02B 302

Patent

active

051345226

ABSTRACT:
A projection lens system having a first positive lens group which includes a positive lens having a strongly convex surface facing the enlarged side and a negative lens, a seond negative lens group which includes a positive lens and a lens in the form of a negative meniscus lens having a concave surface facing the enlarged side, a third lens group which includes a lens in the form of a meniscus lens, wherein at least one lens surface is aspherical, having a concave surface facing the enlarged side, and a diaphragm is arranged between the first positive lens group and the second negative lens group, and wherein said projection lens system is standardized by the conditional expression to form compactly.

REFERENCES:
patent: 2649021 (1953-08-01), Angenieux
patent: 2989895 (1961-06-01), Sandback
patent: 5015076 (1991-05-01), Ueda

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