US 12,243,684 B2
Actuator
Akira Mori, Nagano (JP)
Assigned to NIDEC INSTRUMENTS CORPORATION, Nagano (JP)
Appl. No. 18/037,771
Filed by NIDEC INSTRUMENTS CORPORATION, Nagano (JP)
PCT Filed Nov. 16, 2021, PCT No. PCT/JP2021/042039
§ 371(c)(1), (2) Date May 19, 2023,
PCT Pub. No. WO2022/113819, PCT Pub. Date Jun. 2, 2022.
Claims priority of application No. 2020-194855 (JP), filed on Nov. 25, 2020.
Prior Publication US 2024/0006108 A1, Jan. 4, 2024
Int. Cl. H01F 7/16 (2006.01); H01F 7/08 (2006.01); H01F 7/126 (2006.01)
CPC H01F 7/1607 (2013.01) [H01F 7/081 (2013.01); H01F 7/126 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An actuator comprising:
a support body and a movable body;
a connection body connected to the support body and the movable body; and
a magnetic drive mechanism that includes a magnet and a coil and causes the movable body to move relative to the support body, wherein
the movable body includes: a support shaft having an outer circumferential surface, to which the magnet is fixed; and a yoke that is fixed to an end surface of the magnet in an axial direction,
the yoke includes:
a first magnetic member that includes an end plate fixed to the end surface, a bent section provided at an outer edge of the end plate, and a cylindrical section extending from the bent section to the magnet side; and
a second magnetic member that is fixed to an opposite side of the end plate from the side of the magnet,
the second magnetic member includes a weight adjustment section, which is deficient either partially or entirely in a thickness direction, and
when seen in the axial direction, the weight adjustment section is provided on an inner circumferential side of an outer circumferential surface of the magnet.