US 11,949,309 B2
Linear vibration motor with casing having copper ring and vibration unit with magnetic steel assembly
Ziang Li, Shenzhen (CN); Zhiyong Cui, Shenzhen (CN); and Yan Shao, Shenzhen (CN)
Assigned to AAC Microtech (Changzhou) Co., Ltd., Changzhou (CN)
Filed by AAC Microtech (Changzhou) Co., Ltd., Changzhou (CN)
Filed on Jun. 6, 2022, as Appl. No. 17/833,759.
Claims priority of application No. 202123203982.9 (CN), filed on Dec. 17, 2021.
Prior Publication US 2023/0198364 A1, Jun. 22, 2023
Int. Cl. H02K 33/04 (2006.01)
CPC H02K 33/04 (2013.01) 5 Claims
OG exemplary drawing
 
1. A linear vibration motor, comprising:
a casing with an accommodating space;
a vibration unit accommodated in the accommodating space;
an elastic member suspending the vibration unit in the accommodating space; and
a coil fixed to the casing and driving the vibration unit to vibrate;
wherein the casing comprises a copper ring arranged around the vibration unit;
the vibration unit comprises a magnetic steel assembly, wherein the magnetic steel assembly comprises a plurality of first magnetic steels arranged along a vibration direction of the vibration unit, the first magnetic steels are magnetized along a direction perpendicular to the vibration direction of the vibration unit, magnetization directions of two adjacent first magnetic steels are opposite, and the first magnetic steels together form a magnetic circuit the vibration unit further comprises a mass block sandwiched between two adjacent first magnetic steels and an annular connecting member connecting the first magnet steels and the elastic member.