Zoom lens

Details Zoom lens Zoom lens

1992-12-18

1997-09-09

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

056662300

ABSTRACT:
A zoom lens includes at least two lens groups, i.e., a first lens group and a second lens group. The second lens group includes a first sub-group near to the first lens group and a second sub-group far from the first lens group, and the first lens group and the first sub-group in the second lens group together form a substantially afocal system in at least a portion of a zooming range. In the zoom lens, focusing is effected by the first sub-group in the second lens group being moved along the optical axis. Considering a case where this zoom lens is applied for auto focusing, it is preferable that the first lens group be disposed on that side in the lens group which is most adjacent to the object side.

REFERENCES:
patent: 3152210 (1964-10-01), Gustafson
patent: 4110006 (1978-08-01), Ikemori
patent: 4223981 (1980-09-01), Mizutani et al.
patent: 4636040 (1987-01-01), Tokumaru
patent: 4840468 (1989-06-01), Tanaka
patent: 5272564 (1993-12-01), Suzuki et al.
patent: 5276553 (1994-01-01), Tatsuno
Patent Abstracts of Japan, vol. 9, No. 236 (P-390), Sep. 21, 1985.

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