Photography – Having variable focal length of camera objective – Having focus operation
Patent
1997-01-15
1998-02-03
Perkey, W. B.
Photography
Having variable focal length of camera objective
Having focus operation
396144, G03B 300, G03B 500
Patent
active
057154813
ABSTRACT:
An initial focusing mechanism for a variable-focus photographic camera having a three-stage extension lens barrel, in which a first driving lens barrel is linearly moved back and forth along linear guiding means relative to a stationary lens barrel in the direction of the optical axis and an initial position of the first driving lens barrel relative to the stationary lens barrel is adjusted by attaching or detaching a focusing member to or from the linear guiding means. The operation of initial focusing is thereby simplified. A support block is formed on a portion of the first driving lens barrel and a nut member formed with a female screw is loosely inserted into a nut holder formed in a portion of the support block followed by threading a driving screw extending in parallel to the optical axis with the female screw. A washer formed with a U-shaped notch is attached or detached to or from the driving screw with the first driving lens barrel having been assembled to the stationary lens barrel to adjust an initial position of the first driving lens barrel. Accordingly, the operation of initial focusing can be performed by selectively adjusting, for example, a thickness of the washer.
REFERENCES:
patent: 4307950 (1981-12-01), Suzuki et al.
patent: 5181144 (1993-01-01), Shirie et al.
patent: 5313238 (1994-05-01), Kelley
patent: 5555051 (1996-09-01), Maruyama et al.
Fuji Photo Optical Co., Ltd.
Perkey W. B.
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