Compact zoom lens barrel with high zooming ratio

Details Compact zoom lens barrel with high zooming ratio Compact zoom lens barrel with high zooming ratio

1979-11-07

1981-06-30

Henry, Jon W.

G02B 710

Patent

active

042759528

ABSTRACT:
A zoom lens barrel has incorporated therein two lens groups, the first of which is moved by a single operating ring for focusing and also for zooming. A cam member and an intermediate member are supported on a stationary cylinder. The first lens group is axially moved for focusing by the rotation of the operating ring. By way of the intermediate member, the stationary cylinder and the cam member, the operating ring, when axially moved, axially moves the first and second lens groups at the same time by different amounts for zooming. The barrel affords a high zooming ratio with ease, while the optical system can be designed compactly in a small size.

REFERENCES:
patent: 3663093 (1972-05-01), Iida
patent: 3944340 (1976-03-01), Hashimoto
patent: 4002402 (1977-01-01), Mito
patent: 4171880 (1979-10-01), Mori et al.

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