US 12,003,156 B2
Vibration actuator with plate springs including planar, spiral deformation arms
Yuki Takahashi, Tokyo (JP); Chikara Sekiguchi, Tokyo (JP); Shigeyuki Shimomura, Tokyo (JP); Daisuke Kodama, Tokyo (JP); Yuta Yoshii, Tokyo (JP); Yasutaka Kitamura, Tokyo (JP); and Shigenori Inamoto, Tokyo (JP)
Assigned to Minebea Mitsumi Inc., Nagano (JP)
Filed by Yuki Takahashi, Tokyo (JP); Chikara Sekiguchi, Tokyo (JP); Shigeyuki Shimomura, Tokyo (JP); Daisuke Kodama, Tokyo (JP); Yuta Yoshii, Tokyo (JP); Yasutaka Kitamura, Tokyo (JP); and Shigenori Inamoto, Tokyo (JP)
Filed on Dec. 26, 2021, as Appl. No. 17/561,956.
Application 17/561,956 is a continuation of application No. 17/271,614, granted, now 11,848,586, previously published as PCT/JP2019/033638, filed on Aug. 28, 2019.
Claims priority of application No. 2018-159790 (JP), filed on Aug. 28, 2018.
Prior Publication US 2022/0123642 A1, Apr. 21, 2022
Int. Cl. H02K 33/06 (2006.01)
CPC H02K 33/06 (2013.01) 5 Claims
OG exemplary drawing
 
1. A vibration actuator comprising:
a movable body comprising: a disk-shaped magnet; a pair of disk-shaped cores fixed on front and rear surfaces of the disk-shaped magnet and each having an opening at a center in a radial direction thereof; a pair of leaf springs having a substantially circular shape, each of the leaf springs including a plurality of deformation arms forming a planar, spiral shape in a common plane extending in the radial direction; and
a pair of spring stopper weight parts each having one end positioned by joining the opening to be joined with one of the disk-shaped cores and having another end connected to a central part of one of the leaf springs; and
a fixing body comprising an annular coil and configured to support and accommodate therein the movable body such that the disk-shaped magnet, the disk-shaped cores and the spring stopper weight parts are capable of vibrating in an axial direction inside the annular coil, wherein
each of the leaf springs is provided with a damper as a bridge between spring portions in each of the leaf springs.