Zoom lens system

Details Zoom lens system Zoom lens system

1985-06-29

1985-05-14

Corbin, John K.

350427, 350428, G02B 964, G02B 1518

Patent

active

045168393

ABSTRACT:
A zoom lens system comprising a first lens group of a negative refractive power, a second lens group of a positive refractive power located on the image side of the first lens group with a first variable air space, a third lens group of a negative refractive power located on the image side of the second lens group with a second variable air space and a fourth lens group or unit of a positive refractive power located on the image side of the third lens group with a third variable air space is provided. The first and third variable air spaces are reduced and the second variable air space is increased in accordance with the increase of the focal length of the whole lens system during the zooming. The absolute value of the focal length of the third lens group is greater than that of the second lens group.

REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 4198126 (1980-04-01), Abe et al.

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