Focal-plane shutter and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasanori Sakai
Life of this patent
Estimating the term…
Abstract
A focal-plane shutter 105 includes a leading blade driving member 4 rotatably fitted onto a first shaft 1d and driven by a biasing force of a leading blade driving spring 8, a trailing blade driving member 5 rotatably fitted onto a second shaft 1e and driven by a biasing force of a trailing blade driving spring 9, a leading blade adjusting member 6 rotatably fitted onto the first shaft 1d and adjusting the biasing force of the leading blade driving spring 8, a trailing blade adjusting member 7 rotatably fitted onto the second shaft 1e and adjusting the biasing force of the trailing blade driving spring 9, and an upper base plate 3 including a first surface 3a and a second surface 3b that are thrust position limiters. An area of the first surface 3a is larger than that of the second surface 3b.
Claims10
A focal-plane shutter comprising:
- a leading blade driving member configured to be rotatably fitted onto a first shaft provided on a shutter base plate and to be driven by a biasing force of a leading blade driving spring;
- a trailing blade driving member configured to be rotatably fitted onto a second shaft provided on the shutter base plate and to be driven by a biasing force of a trailing blade driving spring;
- a leading blade adjusting member configured to be rotatably fitted onto the first shaft and to adjust the biasing force of the leading blade driving spring;
- a trailing blade adjusting member configured to be rotatably fitted onto the second shaft and to adjust the biasing force of the trailing blade driving spring;
- and
- a tilt adjusting member for adjusting a tilt of the trailing blade adjusting member caused by the trailing blade driving spring to be greater than that of the leading blade adjusting member caused by the leading blade driving spring.
A focal-plane shutter comprising:
- a leading blade driving member configured to be rotatably fitted onto a first shaft provided on a shutter base plate and to be driven b a biasing force of a leading blade driving spring;
- a trailing blade driving member configured to be rotatably fitted onto a second shaft provided on the shutter base plate and to be driven by a biasing force of a trailing blade driving spring;
- a leading blade adjusting member configured to be rotatably fitted onto the first shaft and to adjust the biasing force of the leading blade driving spring;
- a trailing blade adjusting member configured to be rotatably fitted onto the second shaft and to adjust the biasing force of the trailing blade driving spring;
- and
- an upper base plate configured to receive the leading blade adjusting member and the trailing blade adjusting member so that a tilt of the trailing blade adjusting member caused by the trailing blade driving spring is greater than that of the leading blade adjusting member caused by the leading blade driving spring.
An image pickup apparatus comprising:
- an image pickup element configured to perform photoelectric conversion;
- and
- a focal-plane shutter comprising:
- a leading blade driving member configured to be rotatably fitted onto a first shaft provided on a shutter base plate and to be driven by a biasing force of a leading blade driving spring;
- a trailing blade driving member configured to be rotatably fitted onto a second shaft provided on the shutter base plate and to be driven by a biasing force of a trailing blade driving spring;
- a leading blade adjusting member configured to be rotatably fitted onto the first shaft and to adjust the biasing force of the leading blade driving spring;
- a trailing blade adjusting member configured to be rotatably fitted onto the second shaft and to adjust the biasing force of the trailing blade driving spring;
- and
- a member for causing a tilt of the trailing blade adjusting member caused by the trailing blade driving spring to be greater than that of the leading blade adjusting member caused by the leading blade driving spring.
An image pickup apparatus comprising:
- a leading blade driving member configured to be rotatably fitted onto a first shaft provided on a shutter base plate and to be driven by a biasing force of a leading blade driving spring;
- a trailing blade driving member configured to be rotatably fitted onto a second shaft provided on the shutter base plate and to be driven by a biasing force of a trailing blade driving spring;
- a leading blade adjusting member configured to be rotatably fitted onto the first shaft and to adjust the biasing force of the leading blade driving spring;
- a trailing blade adjusting member configured to be rotatably fitted onto the second shaft and to adjust the biasing force of the trailing blade driving spring;
- and
- an upper base plate configured to receive the leading blade adjusting member and the trailing blade adjusting member so that a tilt of the trailing blade adjusting member caused by the trailing blade driving spring is greater than that of the leading blade adjusting member caused by the leading blade driving spring.
Dependencies are inferred from the claim text.