Patent ID: 7679225

Claim:
A voice coil motor, comprising: a fixed base; at least one guide bar connected to the fixed base; a coil connected to the fixed base, comprising a bottom; a support base movably fit on the guide bar to be moved along an axially moving direction with respect to the at least one guide bar; and an annular magnetic member formed into a single ring piece and connected to the support base and surrounded by the coil, wherein a magnetization direction of the annular magnetic member parallels the axially moving direction of the support base and the annular magnetic member, the annular magnetic member comprises a first magnetic pole and a second magnetic pole, the first magnetic pole is disposed in the coil and separated from the bottom of the coil, the second magnetic pole is disposed outside the coil, and the coil interacts with the annular magnetic member to generate a first force, driving the support base and the annular magnetic member to move along the magnetization direction of the annular magnetic member.