Driving apparatus appropriate for driving mirror unit and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorTakuya Imaizumi
Life of this patent
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Abstract
A driving apparatus which is capable of smoothly moving a follower by a cam portion, and realizes the stopper structure of the follower by a small number of components without the size increased. The driving apparatus comprises an up cam gear having an up radial cam and an up thrust cam, and a down cam gear unit having a down radial cam and a down thrust cam. The up cam gear and the down cam gear unit mesh with each other in a vicinity of a region in which a lift amount of the up radial cam with respect to the follower increases. In a vicinity of a position at which the up cam gear and the down cam gear unit mesh with each other, a lift amount of the up thrust cam is larger than a lift amount of the down thrust cam in the thrust direction.
Claims7
A driving apparatus comprising:
- a first gear having a first cam portion configured to act on a follower in a radial direction, and a second cam portion configured to act on the follower in a thrust direction;
- and
- a second gear having a third cam portion configured to act on the follower in a radial direction, and a fourth cam portion configured to act on the follower in the thrust direction, the second gear meshing with the first gear,
- wherein the first gear and the second gear mesh with each other in a vicinity of a first region in which a lift amount of the first cam portion, with respect to the follower in a radial direction from the first gear toward the second gear, increases, and
- in a vicinity of a position at which the first gear and the second gear mesh with each other in the vicinity of the first region, a lift amount of the second cam portion in the thrust direction is larger than a lift amount of the fourth cam portion in the thrust direction.
A driving apparatus comprising:
- a first gear having a first cam portion configured to act on a follower in a radial direction and a second cam portion configured to act on the follower in a thrust direction;
- and
- a second gear having a third cam portion configured to act on the follower in a radial direction and a fourth cam portion configured to act on the follower in the thrust direction, the second gear meshing with the first gear,
- wherein, when the follower moves from a position at which the follower overlaps the second cam portion when viewed from the thrust direction to a position at which the follower overlaps the fourth cam portion when viewed from the thrust direction, a lift amount of the second cam portion in the thrust direction is larger than a lift amount of the fourth cam portion in the thrust direction.
An image pickup apparatus having a mirror driving apparatus, the mirror driving apparatus causing a mirror unit to reciprocate between a mirror down position and a mirror up position, wherein at the mirror down position, the mirror unit moves into a photographing optical path to guide a luminous flux of an object to a finder optical system, and at the mirror up position, the mirror unit retracts from the photographing optical path to guide the luminous flux to an image pickup unit,
- wherein the mirror driving apparatus comprises:
- a first gear having a first cam portion configured to act on a follower in a radial direction and a second cam portion configured to act on the follower in a thrust direction;
- and
- a second gear having a third cam portion configured to act on the follower in a radial direction and a fourth cam portion configured to act on the follower in the thrust direction, the second gear meshing with the first gear,
- wherein the first gear and the second gear mesh with each other in a vicinity of a first region in which a lift amount of the first cam portion, with respect to the follower in a radial direction from the first gear toward the second gear, increases, and
- in a vicinity of a position at which the first gear and the second gear mesh with each other in the vicinity of the first region, a lift amount of the second cam portion in the thrust direction is larger than a lift amount of the fourth cam portion in the thrust direction.
Dependencies are inferred from the claim text.