One-hand zoom lens barrel

Details One-hand zoom lens barrel One-hand zoom lens barrel

1986-12-02

1989-04-18

Corbin, John K.

350427, 350255, G02B 1514, G02B 702

Patent

active

048221538

ABSTRACT:
A lens barrel for a zoom lens in which zooming is achieved by moving both front and rear lenses but focussing is achieved by moving only the front lens. When a sliding ring slides linearly for zooming, a cam sleeve is rotated. A pin in the cam sleeve engages a cam groove in a moving frame for the front lens to thereby linearly move the front lens. Another cam groove in the cam sleeve engages a pin in the frame for the rear lens to thereby also linearly move it. Focussing is achieved by a threaded rotation of the frame for the front lens on the moving frame.

REFERENCES:
patent: 4275952 (1981-06-01), Uesugi
patent: 4726665 (1988-02-01), Itoh

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