US 12,126,237 B2
Linear vibration motor and linear vibration system
Kenichi Shirato, Nagaokakyo (JP); Masahiro Ozawa, Nagaokakyo (JP); and Kazuhide Takata, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Aug. 18, 2021, as Appl. No. 17/405,353.
Application 17/405,353 is a continuation of application No. PCT/JP2020/005526, filed on Feb. 13, 2020.
Claims priority of application No. 2019-027436 (JP), filed on Feb. 19, 2019.
Prior Publication US 2021/0384810 A1, Dec. 9, 2021
Int. Cl. H02K 33/18 (2006.01); B06B 1/04 (2006.01); H02K 33/16 (2006.01)
CPC H02K 33/18 (2013.01) [B06B 1/04 (2013.01); H02K 33/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A linear vibration motor, comprising:
a housing;
a moving member disposed in the housing;
a drive unit including a driving coil disposed in the housing and a driving magnet attached to the moving member; and
a bias unit disposed in the housing and including a biasing electromagnet having a core and a biasing coil, and a biasing magnet attached to the moving member,
wherein the moving member is configured to vibrate in a first direction substantially orthogonal to a winding axis of the driving coil with a Lorentz force generated by an interaction between a magnetic field generated by the driving coil when energized and a magnetic field generated by the driving magnet, and
wherein the biasing electromagnet and the biasing magnet are disposed such that identical poles of the biasing electromagnet and the biasing magnet face each other when the biasing electromagnet is energized, and the moving member is biased in the first direction by a magnetic spring resulting from a repulsive force generated between the energized biasing electromagnet and the biasing magnet.