Zoom lens having three movable lens groups

Details Zoom lens having three movable lens groups Zoom lens having three movable lens groups

1979-12-03

1981-12-22

Corbin, John K.

G02B 1514

Patent

active

043067760

ABSTRACT:
In the disclosed zoom lens of the mechanical compensation type, a first movable lens group, a second movable lens group, a third movable lens group and a fixed lens group are located in sequence from the object end. The first, second and third lens groups are simultaneously moved along the optical axis independently of each so as to change the focal length. The first movable lens group is placed closer to the image at the end of the wide angle position rather than at the end of the telephoto position, while during zooming, the axial movement of the first movable lens from the extreme wide angle position to the extreme telephoto position is smaller than that of the third movable lens group. On the other hand, during focusing, the second and the third lens groups are fixed, while the first movable lens group is moved.

REFERENCES:
patent: 3481666 (1969-12-01), Hoguchi
patent: 3533678 (1970-10-01), Altman et al.
patent: 3619035 (1971-11-01), Hopkins
patent: 3771853 (1973-11-01), Nakamura
patent: 3975089 (1976-08-01), Betensky
patent: 4135786 (1979-01-01), Ikemori
patent: 4196969 (1980-04-01), Itoh

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