Patent ID: 6140724
Filing Date: 2000-10-31
Classification: H02K

Abstract:
A vibration motor comprising:a case having near and remote ends;a housing extending within the case from the near end of the case toward the remote end of the case and having a predetermined length, the housing having a guide passage formed therethrough;a magnet fitted around the housing;a brush base fitted into the remote end of the case and having a pair of brushes which are mounted onto an inner surface thereof, each brush having an end and the brush ends being spaced apart by a predetermined distance;a commutator placed adjacent the brush base within the case and having a contact bar extending within the case which is interposed between the ends of the brushes to allow the ends of the brushes to come into contact with an outer surface of the contact bar;a guider provided at a remote end of the contact bar, the guider having a remote end having a girth smaller than the predetermined distance and a near end having a girth larger than the predetermined distance so that moving the guider toward, and between the brushes in the remote direction causes widening of the distance between the ends of the brushes, to enable the contact bar of the commutator to be moved easily in the remote direction towards and fitted between the pair of brushes without being obstructed by the ends of the pair of brushes;a shaft rotatably fitted in the guide passage of the housing and having one end fitted into the contact bar of the commutator to be placed in the brush base and the other end projecting out of the near end of the case;a coil disposed such that it is radially separated from the magnet by a predetermined distance and receiving current through the commutator;a pair of bearings positioned inside and outside the case, respectively, for supporting the shaft; anda weight counter secured to the near end of the shaft projecting out of the case and having a center of gravity which is eccentrically defined from a center of the shaft.