Patent ID: 8581451

Claim:
A vibration motor for a portable terminal, the vibration motor comprising: a flat spring including a circular inner securing member and a circular outer securing member disposed around the circular inner securing member; a cylindrical magnetic substance mounted on the flat spring; an annular magnetic substance disposed around the cylindrical magnetic substance and mounted on the flat spring; a yoke coupled to the flat spring; and a weight having a recess on one side and secured to the circular inner securing member, wherein the yoke is attached to a bottom surface of the weight; and a coil disposed between the cylindrical magnetic substance and the annular magnetic substance, wherein the cylindrical magnetic substance and the annular magnetic substance are attached to the yoke, wherein the magnetic substances perform a linear reciprocal movement by an electromagnetic force generated between the magnetic substances and the coil and by an elastic force of the flat spring as electric current is applied to the coil, and wherein the yoke includes a coupling protrusion which extends from one side of the yoke and penetrates through the weight and the inner securing member, to be coupled with the inner securing member.