Projection lens

Details Projection lens Projection lens

1994-09-28

1996-02-20

Phan, James

Optical: systems and elements

Lens

With field curvature shaping

359715, 359771, 359780, G02B 300, G02B 1318

Patent

active

054934460

ABSTRACT:
A projecting lens for projecting the image of an object onto a screen comprising, in the order from the screen side, a first lens group of a positive refractive power; a cemented second lens group of a positive refractive power; a third lens group of a negative refractive power; and a fourth lens group of a positive refractive power with a concave surface at the screen side; wherein each of the first and third lens group has at least an aspherical face, and the focal length f of the projecting lens, the focal length f1 of the first lens group and the focal length f3 of the third lens group satisfy conditions: 0<f/f1<0.25 and -0.1<f/f3<0.

REFERENCES:
patent: 4620773 (1986-11-01), Fukuda
patent: 4682861 (1987-07-01), Hosoya
patent: 4699476 (1987-10-01), Clarke
patent: 4707084 (1987-11-01), Betensky
patent: 4755028 (1988-07-01), Moskovich
patent: 4770513 (1988-09-01), Fujie et al.
patent: 4776681 (1988-10-01), Moskovich
patent: 4884879 (1989-12-01), Fukuda et al.
patent: 4950062 (1990-08-01), Kimura et al.
patent: 5066113 (1991-11-01), Nakajima et al.

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