Projection lens system

Details Projection lens system Projection lens system

1996-11-04

1998-10-13

Epps, Georgia Y.

Optical: systems and elements

Lens

With field curvature shaping

359649, 359757, 359764, G02B 2102

Patent

active

058221298

ABSTRACT:
A projection lens system has a wide angle with small value for back focus, superior telecentric characteristics, and small distortion. The projection lens system includes a first lens group having a negative refractive power and a second lens group having a positive refractive power. The focal length of the entire system, the focal length of the first lens group and the focal length of the second lens group satisfy conditional formulas.

REFERENCES:
patent: 4989961 (1991-02-01), Yoshioka
patent: 5278698 (1994-01-01), Iizuka et al.
patent: 5442484 (1995-08-01), Shikawa
patent: 5519537 (1996-05-01), Shikama
English-language abstract of Hei 5-45582(A).
English-language abstract of Hei. 5-203871(A).
English-language abstract of Hei. 6-82690(A).
English-language abstract of Hei. 6-148518(A).
English-language abstract of Hei. 7-92385(A).
English-language abstract of Hei. 7-253535(A).

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