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US 2006/0138873 A1Published application
Driving apparatus for moving member to be moved
AssigneeCanon Kabushiki Kaisha
InventorHiromu Yasuda
Life of this patent
Estimating the term…
Abstract
A magnet of a driving apparatus for moving a member to be moved from one abut end position to the other abut end position is caused to generate a magnetic force acting in the direction of an optical axis as well as a torque acting in a rotational direction.
Claims6
A driving apparatus comprising:
- an actuator equipped with a rotatable ring-shaped magnet, a coil, and a stator disposed in close proximity to the magnet in an axial direction of the magnet, the magnet being moved to one of a rotational position at a first position and a rotational position at a second position due to switching of a direction of energization of the coil;
- and
- a member to be moved which is movable in the axial direction of the magnet from one abut end position to another abut end position as the magnet is moved from one of the first position and the second position to the other of the first position and the second position within a movable range between the first position and the second position, wherein:
- the movable range of the magnet is set in a manner that a torque acting in a rotational direction during cessation of energization of the coil at a time when the magnet is at the first position becomes smaller than a torque required for holding the magnet;
- and
- the member to be moved is held at the one abut end position by a magnetic force acting in the axial direction between the magnet and the stator during cessation of energization of the coil.
3 more elements
A driving apparatus for moving a member to be moved from one abut end position to the other abut end position, comprising:
- a stator which is excited through energization control of a coil;
- and
- a magnet rotatable around a center of a rotation axis of the magnet in accordance with excitation of the stator,
- wherein the magnet has, in addition to a torque acting in a rotational direction, a magnetic force acting in a rotation axis direction at the one abut end position, and the magnet is movable in the rotation axis direction.
1 more element
A driving apparatus for moving a member to be moved from a first position which is one abut end position to a second position which is another abut end position, comprising:
- a stator which is excited through energization control of a coil;
- and
- a magnet rotatable around a center of a rotation axis of the magnet in accordance with excitation of the stator, wherein:
- the magnet has a magnetic force acting in a rotation axis direction as well as a torque acting in a rotational direction;
- the member to be moved moves along a cam locus in accordance with rotation of the magnet;
- and
- the cam locus is formed in a manner that the cam locus becomes identical in direction to rotation of the magnet at the first position, and that the cam locus becomes different in direction from rotation of the magnet at the second position.
4 more elements
Dependencies are inferred from the claim text.