Zoom lens system

Details Zoom lens system Zoom lens system

1991-11-29

1994-01-18

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359691, 359692, 359740, G02B 1514, G02B 908

Patent

active

052803902

ABSTRACT:
A zoom lens system includes, in order from the object side, the first lens group having a positive focal length and the second lens group having a negative focal length. The system performs zooming by changing the distance between the first and second lens groups. The first lens group has a negative lens element on the side closest to the object that has a concave surface of large curvature directed towards the image plane and the first lens group satisfies the specific conditions.

REFERENCES:
patent: 4720179 (1988-01-01), Ito
patent: 4830476 (1989-05-01), Aoki
patent: 4936661 (1990-06-01), Betensky et al.
patent: 4953957 (1990-09-01), Kobayashi
patent: 4991945 (1991-02-01), Estelle

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