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US 4,839,680 AGranted
Method and device for driving lens shutter
AssigneeMamiya Camera Co., Ltd.
InventorsMitsumasa Amada, Hitosi Sibasaki, Masami Nagasaka
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AssigneeMamiya Camera Co., Ltd.
InventorsMitsumasa Amada, Hitosi Sibasaki, Masami Nagasaka
Estimating the term…
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.
A method of driving a lens shutter built in a lens barrel to be equipped on a single-lens reflex camera, said method comprising steps of charging said lens shutter, opening shutter blades of the lens shutter, closing said shutter blades and releasing said lens shutter, all these steps being caused by rotating a shaft of a reversible motor in one direction and a reverse direction.
A device for driving a lens shutter built in a lens to be equipped on a single-lens reflex camera, said device comprising a driving ring for charging said lens shutter and then opening shutter blades of the lens shutter by rotation of said driving ring in one direction and for closing said shutter blades and then releasing said lens shutter by rotation of said driving ring in a reverse direction, a motor for driving said driving ring in normal and reverse directions, position detecting means for detecting rotated position and rotating directions of said driving ring, and control means for controlling rotations of said motor in the normal and reverse directions with the aid of output signals from said position detecting means.
A device for driving a lens shutter built in a lens to be equipped on a single-lens reflex camera, said device comprising a driving ring for charging said lens shutter by rotation of said driving ring in one direction and for releasing said lens shutter by rotation of said driving ring in a reverse direction, a motor for driving said driving ring in normal and reverse directions, an operating ring engaging said driving ring at ends of the normal and reverse rotations of the driving ring to rotate in charging and releasing directions together with the driving ring for opening shutter blades of said lens shutter by the rotation in the charging direction and closing said shutter blades and then releasing said lens shutter by the rotation in the release direction, position detecting means for detecting rotated positions and rotating directions of said driving ring, and control means for controlling rotations of said motor in the normal and reverse directions with the aid of output signals from said position detecting means.
Dependencies are inferred from the claim text.