Zoom lens system

Details Zoom lens system Zoom lens system

1995-09-15

1997-05-27

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

056337590

ABSTRACT:
A zoom lens system of the invention is double telephoto type zoom lens system having a positive
egative/positive
egative refractive power arrangement. During zooming from the wide angle side toward the telephoto side, the first through fourth lens units move such that the distance between the first and second lens units increases and the distance between the third and fourth lens units decreases. The refractive power of the first lens unit and the refractive power of the fourth lens unit are appropriately prescribed so that an adequate back focal lens distance is preserved.

REFERENCES:
patent: 4345821 (1982-08-01), Tachihara
patent: 4345822 (1982-08-01), Tachihara
patent: 4592626 (1986-06-01), Fujii
patent: 4629294 (1986-12-01), Tanaka et al.
patent: 4639096 (1987-01-01), Kitagishi et al.
patent: 4673248 (1987-06-01), Masumoto
patent: 4673258 (1987-06-01), Masumoto
patent: 4701033 (1987-10-01), Masumoto
patent: 5272566 (1993-12-01), Aoki
patent: 5493447 (1996-02-01), Ohtake

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