Patent ID: 8558418
Filing Date: 2013-10-15
Classification: G11B

Abstract:
1. A voice coil motor, comprising: a lens carrier, physically connected with a magnetic device; an electromagnetic driving apparatus, constructed by a coil; a magnetic sensing element, for detecting a location of the lens carrier and outputting the location value relating to the location of the lens carrier via an amplifier; a storage media, for storing a gain value and an offset compensation value relating with the amplifier; and a controller, for moving the lens carrier according to a ratio of a full length of a move path and a command value between a top position and a bottom position in which the lens carrier can be moved within the voice coil motor using the coil interaction with a magnetic field of the magnetic device when current is applied to the coil according to the location value from the amplifier corrected by the gain value and the offset compensation value from the storage media; wherein the full length is a maximum distance between the top position and the bottom position in which the lens carrier is allowed to be moved within the voice coil motor, and the command value is an absolute value of the location value of the lens carrier between the top position and the bottom position.