Zoom lens system

Details Zoom lens system Zoom lens system

1990-06-28

1992-10-27

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359693, 359705, G02B 1500

Patent

active

051594943

ABSTRACT:
The present invention provides a zoom lens system comprising, in the order from the object side, a first lens unit having positive refractive power, a second lens unit having positive refractive power and a third lens unit having negative refractive power, and adapted so as to perform zooming by varying the airspaces reserved between the lens units and permit photographing at an expanded tele position providing a focal length longer than that of the zoom lens system as a whole at the tele position by setting the airspace reserved between the second lens unit and the third lens unit at a width smaller than that at the tele position.

REFERENCES:
patent: 4178076 (1979-12-01), Tsuji et al.
patent: 4256371 (1981-03-01), Someya
patent: 4711534 (1987-12-01), Matsushita et al.
patent: 4726668 (1988-02-01), Nakayama et al.
patent: 4830477 (1989-05-01), Takahashi et al.
patent: 4840467 (1989-06-01), Takada et al.
patent: 4848883 (1989-07-01), Maruyama
patent: 4865434 (1989-09-01), Matsushita et al.

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