Rotary feed mechanism

Details Rotary feed mechanism Rotary feed mechanism

1996-06-28

1997-12-23

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359823, 359829, G02B 1514, G02B 702

Patent

active

057012067

ABSTRACT:
A rotary feed mechanism of a camera includes a stationary barrel secured to a camera body. Multiple-female threads are provided in an inner surface of the stationary barrel. A rotatable barrel is coaxially and movably inserted in the stationary barrel. The rotatable barrel is provided with multiple-male threads on an inner surface to engage the multiple-female threads of the stationary barrel. The linearly movable lens barrel is provided with multiple-male threads to engage the multiple-female threads of the stationary barrel. The linearly movable lens barrel supports a plurality of lenses arranged to be movable in an optical axis direction. A linear guide is provided on the linearly movable lens barrel, for moving the linearly movable lens barrel along the optical axis direction without causing rotation while the rotatable barrel is rotated. The linear guide has a projection to be guided by a linear guide groove formed on the stationary barrel. An idle device is provided on the stationary barrel for substantially preventing the rotatable barrel from advancing in the optical axis direction with respect to the stationary barrel only when the rotatable barrel is being assembled in the predetermined initial position with respect to the stationary barrel.

REFERENCES:
patent: 4385023 (1983-05-01), Sumi
patent: 5051764 (1991-09-01), Nomura
patent: 5164757 (1992-11-01), Nomura
patent: 5386740 (1995-02-01), Nomura et al.
patent: 5469300 (1995-11-01), Nomura
patent: 5488513 (1996-01-01), Tanaka
patent: 5587843 (1996-12-01), Chen
patent: 5594589 (1997-01-01), Chen

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