Patent ID: 9467033
Filing Date: 2016-10-11
CPC Classification: B06B,H02K,H04M

Claim Text:
1. A vibration motor comprising: a housing having a top surface, a bottom surface, and first to fourth side surfaces joining the top surface to the bottom surface, the first to fourth surfaces defining an inner circumferential surface of the housing; a coil provided in the housing; a moving portion provided in the housing, the moving portion being configured to reciprocate between the first and third side surfaces arranged opposite to each other; an elastic member provided between the moving portion and the housing; and a roller member provided in the housing and arranged to come into rolling contact with the top or bottom surface of the housing, the roller member having a cylindrical body and shaft coupling portions respectively protruded from both ends of the cylindrical body, wherein a diameter of the cylindrical body is greater than a thickness of the moving portion, wherein the roller member is coupled to the moving portion, wherein the elastic member comprises: a first elastic member located between the moving portion and the first side surface; and a second elastic member located between the moving portion and the third side surface, and wherein an elastic coefficient of the first elastic member is different from an elastic coefficient of the second elastic member.