Vibration actuator, and lens barrel and camera provided with the vibration actuator
AssigneeNikon Corporation
InventorTakahiro Sato
Life of this patent
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Abstract
Provided is a vibration actuator having stable drive characteristics, and a lens barrel and a camera which are provided with such vibration actuator. The vibration actuator of the present invention is provided with: a relatively moving member, which is brought into pressurized contact with a vibrating member, and moves relative to the vibrating member by vibration of the vibrating member; a pressure member which brings the vibrating member and the relatively moving member into pressurized contact with each other; and a magnetic force generating section which adjusts the pressurizing force of the pressure member by a magnetic force.
Claims9
A vibration actuator comprising:
- a vibrating member;
- a relatively moving member configured to move relative to the vibrating member;
- a pressure member configured to apply a pressing force to the vibrating member to cause the vibrating member to be in pressure contact with the relatively moving member;
- and
- a magnetic force generating unit configured to adjust the pressing force of the pressure member according to a variable amount of magnetic force according to an ambient temperature;
- wherein
- the pressure member includes an elastic member that presses the vibrating member toward the relatively moving member, and the magnetic force generating unit causes a magnetic force to be generated in a direction suppressing pressure imparted by the elastic member.
Dependencies are inferred from the claim text.