Mamiya Camera Co., Ltd.

Mitsumasa Amada

Masami Nagasaka

Hitosi Sibasaki

A method of driving a lens shutter of an interchangeable lens for a single-lens reflex camera comprises steps of charging the lens shutter, opening shutter blades of the lens shutter, closing the shutter blades and releasing the lens shutter by rotations of a reversible motor in one direction and a reverse direction. A device for driving a lens shutter of an interchangeable lens for a single-lens reflex camera comprises a driving a ring, a reversible motor for driving ring, position detecting unit for detecting rotated position and rotating directions of the driving ring, and control means for controlling rotations of the motor. The driving ring is driven in one direction during which the lens shutter is charged and shutter blades of the lens shutter are opened, while in a reverse direction during which the shutter blades are closed and the lens shutter is released. As an alternative, an operating ring is provided in addition to the driving ring. In this case, the driving ring is driven in one direction during which the lens shutter is charged and in a reverse direction during which the lens shutter is released. The operating ring is engaged with the driving ring at ends of the normal and reverse rotations of the driving ring to rotate in charging direction during which the shutter blades are opened, and in releasing direction during which the shutter blades are closed and the lens shutter is released.

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Soka, Japan

Mitsumasa Amada