Lens barrel

Details Lens barrel Lens barrel

1996-01-24

1996-11-12

Blankenship, Howard B.

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

396 85, 396379, G03B 113

Patent

active

055745261

ABSTRACT:
A lens barrel of a camera has a stationary cylinder and a rotary cylinder which is advanced and retracted relative to the stationary cylinder while it is rotated.
A plurality of helical gears as well as a helicoid are formed, along the helicoid, on an outer periphery of the rotary cylinder which is helicoid-coupled to the stationary cylinder and advanced and retracted along the optical axis while it is rotated. A plurality of drive gears which are gear-coupled to the helical gears are formed on the stationary cylinder. At least one of the plurality of drive gears is gear-coupled to the helical gears in a rotation range of the rotary cylinder.

REFERENCES:
patent: 4416526 (1983-11-01), Iomori et al.
patent: 4857947 (1989-08-01), Wakabayashi et al.
patent: 4885600 (1989-12-01), Iwasa et al.
patent: 5035493 (1991-07-01), Tanaka
patent: 5144493 (1992-09-01), Nomura
patent: 5144494 (1992-09-01), Sekiguchi
patent: 5182674 (1993-01-01), Notagashira et al.
patent: 5198932 (1993-03-01), Takamura

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