Photography – Having variable focal length of camera objective – Having focus operation
Patent
1997-01-15
1998-03-10
Perkey, W. B.
Photography
Having variable focal length of camera objective
Having focus operation
396144, G03B 300, G03B 500
Patent
active
057272379
ABSTRACT:
A driving mechanism for a photographic lens in a variable-focus photographic camera adapted to move back and forth, a first driving lens barrel movably received within a stationary lens barrel, and a second driving lens barrel movably received within the first driving lens barrel with driving forces separately transmitted from a common electric motor serving as a drive source and thereby to provide a so-called three-stage extension lens barrel which advantageously eliminates the necessity for incorporation of driving ring members into the stationary lens barrel and/or the first driving lens barrel as well as the necessity for constructing the stationary lens barrel and/or the first driving lens barrel in multiple structure. Such an arrangement also positively contributes to realization of a thin and compact camera. A lens barrel driving gear is engaged with a first gear fixed on a driving screw serving for linearly driving the first driving lens barrel and thereby a driving force is transmitted from an electric motor to the first driving gear. A follower gear in engagement with an internal gear formed on the inner peripheral surface of a second driving lens barrel and a second driving gear coaxial therewith, are operatively associated with the lens barrel driving gear via a driving force transmission gear to obtain a driving force for rotation of the second driving lens barrel from the electric motor. By operatively associating the first driving lens barrel with the second driving lens barrel by means of helicoid, the second driving lens barrel is moved back and forth relative to the first driving lens barrel as the second driving lens barrel rotates around the optical axis.
Fuji Photo Optical Co., Ltd.
Perkey W. B.
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