Power transmission and camera
AssigneeNikon Corporation
InventorYousuke Kouno
Life of this patent
Estimating the term…
Abstract
A power transmission capable of regulating the disengagement of a nut part from a screw part, and the like are provided. The power transmission is constructed of a rotation shaft having a thread formed on a periphery thereof; a nut member capable of being opened and closed, the nut member having a thread engaged with the thread of the rotation shaft, and pinching the rotation shaft and moving as the rotation shaft is rotated; a regulating part enabling movement of the nut member by regulating opening of the nut member; and a regulation releasing part capable of releasing engagement between the nut member and the rotation shaft by opening the nut member.
Claims22
A power transmission, comprising:
- a rotation shaft having a thread formed on a periphery thereof;
- a nut member including a resilient part that straddles the rotation shaft and has a thread engaged with the thread of the rotation shaft, and the nut member moving synchronously with the rotation of the rotation shaft;
- and
- a guide member including a regulating part and a regulation releasing part, wherein
- the regulating part restricts the width of the resilient part from expanding so as to allow the nut member to move when the regulating part is in contact with the resilient part,
- the regulation releasing part allows the width of the resilient part to expand such that the nut member and the rotation shaft disengage from each other under a predetermined condition,
- the regulating part and the regulation releasing part are configured to lie at different positions in a direction parallel with the rotation shaft, and
- the nut member moves in a first direction and disengages from the rotation shaft at the regulation releasing part when the rotation shaft rotates in a first rotational direction and moves in a second direction opposite to the first direction when the rotation shaft rotates in a second rotational direction opposite to the first rotational direction.
A camera comprising:
- a power transmission having a rotation shaft having a thread on a periphery thereof;
- a nut member including a resilient part that straddles the rotation shaft and has a thread engaged with the thread of the rotation shaft, the nut member moving synchronously with the rotation of the rotation shaft;
- a guide member including a regulating part and a regulation releasing part;
- an actuator to rotate the rotation shaft of the power transmission;
- and
- a movable lens connected to the nut member of the power transmission, wherein
- the regulating part restricts the width of the resilient part from expanding so as to allow the nut member to move when the regulating part is in contact with the resilient part,
- the regulation releasing part allows the width of the resilient part to expand such that the nut member and the rotation shaft disengage from each other under a predetermined condition, and
- the nut member moves in a first direction and disengages from the rotation shaft at the regulation releasing part when the rotation shaft rotates in a first rotational direction and moves in a second direction opposite to the first direction when the rotation shaft rotates in a second rotational direction opposite to the first rotational direction.
Dependencies are inferred from the claim text.