US 12,155,285 B2
Actuator and lid with pressing convex portions
Hiroshi Kitahara, Nagano (JP)
Assigned to NIDEC SANKYO CORPORATION, Nagano (JP)
Filed by NIDEC SANKYO CORPORATION, Nagano (JP)
Filed on Oct. 11, 2021, as Appl. No. 17/498,704.
Claims priority of application No. 2020-174577 (JP), filed on Oct. 16, 2020.
Prior Publication US 2022/0123644 A1, Apr. 21, 2022
Int. Cl. H02K 33/18 (2006.01)
CPC H02K 33/18 (2013.01) 6 Claims
OG exemplary drawing
 
1. An actuator comprising:
a support body and a movable body;
a connecting body, connected to the support body and the movable body, having at least one of elasticity and viscoelasticity; and
a magnetic drive mechanism, having a magnet and a coil, and being configured to cause the movable body to relatively move with respect to the support body,
wherein one of the movable body and the support body comprises:
a shaft to support one of the magnet and the coil at inside of an inner circumference of the other of the movable body and the support body; and
an inner frame that surrounds outside of an outer circumference of the shaft,
wherein the other of the movable body and the support body comprises:
an outer frame that faces the inner frame in a radial direction;
a case with a cylindrical shape that surrounds outside of an outer circumference of the outer frame; and
a lid member that closes an end of the case,
wherein the inner frame is connected to the outer frame by the connecting body with a cylindrical shape that is disposed in a gap between the inner frame and the outer frame,
the lid member comprises:
a plate portion;
an edge portion extending from an outer peripheral edge of the plate portion along an axial direction of the shaft; and
a first annular rib and a second annular rib, which project from the plate portion in the axial direction on an inner circumferential side of the edge portion,
the first annular rib is disposed at a center of the plate portion, and the second annular rib is disposed between the first annular rib and the edge portion,
the second annular rib is connected to the first annular rib with radial ribs, and connected to the edge portion with radial ribs, in which the radial ribs are arranged radially,
the second annular rib is disposed at a position overlapping the outer frame as viewed in the axial direction, and a tip surface of the second annular rib comprises a plurality of pressing convex portions that project from the tip surface of the second annular rib in the axial direction and abuts the outer frame, and
the plurality of pressing convex portions are arranged at positions spaced apart from each other along a circumference direction.