Patent ID: 8427016
Filing Date: 2013-04-23
Classification: H02K

Abstract:
1. A linear vibrator comprising: a casing defining an internal space of the vibrator; a bracket disposed under the casing and having a coil, to which electricity is applied to induce a magnetic field; an oscillator having a hollow yoke with a closed end, a magnet received in the hollow portion of the yoke, and a cylindrical weight coupled onto the circumference of the yoke and provided with a plurality of recesses on an outer circumferential surface of the weight, the plurality of recesses being disposed around the circumferential surface of the weight at distances of 360°/n, wherein n indicates a number of rotary members each inserted into a respective one of the recesses while being in contact with an inner sidewall of the casing, each of the recesses having a shape corresponding to that of its respective rotary member; a spring member coupled with an upper portion of the casing to elastically support the oscillator such that the oscillator is movable in a linear motion.