US 11,736,038 B2
Vibration actuator reduced in size and suppressed in generating abnormal noise and optical device
Takao Mori, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Feb. 28, 2022, as Appl. No. 17/682,535.
Claims priority of application No. 2021-031805 (JP), filed on Mar. 1, 2021.
Prior Publication US 2022/0278632 A1, Sep. 1, 2022
Int. Cl. H02N 2/00 (2006.01); H02N 2/02 (2006.01)
CPC H02N 2/0065 (2013.01) [H02N 2/002 (2013.01); H02N 2/006 (2013.01); H02N 2/0045 (2013.01); H02N 2/026 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A vibration actuator comprising:
a vibration element including an electromechanical energy conversion element and an elastic member; and
a contact body in contact with the vibration element,
wherein the contact body has a direction in which the vibration element and the contact body move relative to each other as a longitudinal direction, and a square bar shape which is substantially uniform in width and thickness in the longitudinal direction, and includes a first section and a second section which are formed with respective R surfaces different in curvature radius on an edge extending in the longitudinal direction, in an area where the contact body performs frictional sliding on the vibration element.