Zoom lens barrel having macro-photographing mechanism

Details Zoom lens barrel having macro-photographing mechanism Zoom lens barrel having macro-photographing mechanism

1976-09-23

1978-05-16

Sacher, Paul A.

350255, G02B 1516, G02B 1518

Patent

active

040895904

ABSTRACT:
A zoom lens barrel having a macro-photographing mechanism including a main barrel carrying a control ring assembly which is divided into a first operating ring rotatable and slidable relative to the main barrel along the optical axis thereof, and a second operating ring movable with the first operating ring along the optical axis, the second operating ring being rotatable about the optical axis relative to the first operating ring. The rotation of the first operating ring effects the focusing of a lens system for ordinary photography, and the slide movement of the first operating ring effects zooming by causing a cam ring integral with the second operating ring to follow said movement, whereby when the cam ring is positioned at the wide-angle end or the telephoto end in zooming, the cam ring effects focusing of the lens system for macro-photography due to the rotation of the second operating ring relative to the first operating ring.

REFERENCES:
patent: 3731987 (1973-05-01), Iida et al.
patent: 3784285 (1974-01-01), Watanabe et al.
patent: 3817600 (1974-06-01), Watanabe et al.
patent: 3891310 (1975-06-01), Hideo et al.

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