Zoom lens system

Details Zoom lens system Zoom lens system

1996-10-02

1998-09-29

Font, Frank G.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

058153217

ABSTRACT:
A zoom lens system has four lens units. The first, third and fourth lens units thereof are lens units of positive power. The second lens unit thereof has negative power. During zooming, the first lens unit is moved. During focusing, the second and third lens units are moved and a distance between the third and fourth lens units is varied. The third lens unit is moved toward an object side.

REFERENCES:
patent: 4629294 (1986-12-01), Tanaka et al.
patent: 4695133 (1987-09-01), Kitagishi et al.
patent: 4917482 (1990-04-01), Ito
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5412507 (1995-05-01), Sato
patent: 5537255 (1996-07-01), Tochigi
patent: 5568321 (1996-10-01), Ogawa et al.

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