Camera and shutter device
AssigneeCanon Kabushiki Kaisha
InventorShigeru Yamagami
Life of this patent
Estimating the term…
Abstract
At least one exemplary embodiment is directed to a cam gear which can rotate counterclockwise to prepare for photographing. This rotation of the cam gear can cause a cam lever shaft to move from a first cam section that allows a shutter charging lever to be kept in a charged state, over a projection located near an end of the first section, to a second section configured to release the charged state. In conjunction with the movement of the cam lever shaft over the projection, the shutter charging lever momentarily moves from the charged position to an overcharged position, and then moves further to a pre-exposure retracted position.
Claims5
A camera in which a shutter curtain is charged and driven to a charged state against a spring force, and then the charged state is released to allow the shutter curtain to be moved by the spring force, the camera comprising:
- a shutter curtain driving lever configured to movably support the shutter curtain and to be biased in a direction in which the shutter curtain is moved by the spring force;
- a shutter charging lever having a cam surface configured to move and drive the shutter curtain driving lever against the spring force, thereby driving the shutter curtain driving lever to the charged state and holding the shutter curtain driving lever in the charged state;
- a cam member having a first section configured to allow the shutter charging lever to be kept in the charged state and a second section configured to release the shutter charging lever from the charged state;
- and
- a driving unit configured to drive the cam member to rotate;
- wherein the cam member has a projection provided in the middle of a path from the first section to the second section and projecting from a cam surface defining the first section.
A shutter device in which a shutter curtain is charged and driven to a charged state against a spring force, and then the charged state is released to allow the shutter curtain to be moved by the spring force, the shutter device comprising:
- a shutter curtain driving lever configured to movably support the shutter curtain and to be biased in a direction in which the shutter curtain is moved by the spring force;
- a shutter charging lever having a cam surface configured to move and drive the shutter curtain driving lever against the spring force, thereby driving the shutter curtain driving lever to the charged state and holding the shutter curtain driving lever in the charged state;
- a cam member having a first section configured to allow the shutter charging lever to be kept in the charged state and a second section configured to release the shutter charging lever from the charged state;
- and
- a driving unit configured to drive the cam member to rotate;
- wherein the cam member has a projection provided in the middle of a path from the first section to the second section and projecting from a cam surface defining the first section.
Dependencies are inferred from the claim text.