Voice coil motor

摘要

A VCM (voice coil motor) is disclosed, the VCM including: a rotor including a cylindrical bobbin for accommodating a lens and protruded at a bottom end with a boss, and a coil block arranged at a periphery of the bobbin; a stator including a magnet facing the coil block and a yoke fixing the magnet; and an elastic member including a first elastic member formed with a through hole coupled to the boss of the bobbin and a second elastic member coupled to an upper end facing the bottom end of the bobbin; wherein the boss is formed with a disengagement prevention unit preventing the first elastic member from being disengaged from the boss, and the first elastic member is formed with a coupling unit contacting a joint where the disengagement prevention unit and the coupling unit meet.

主权项

1. A voice coil motor comprising:
a base; a yoke disposed over the base; a bobbin disposed inside the yoke and including plurality of first protrusions at a lower portion thereof; a coil block disposed on a side surface of the bobbin; a magnet facing the coil block and secured to the yoke; and a first elastic member coupled to the lower portion of the bobbin; wherein the first elastic member includes a first spring and a second spring separated from the first spring, and each of the first and second springs includes an outer elastic unit, an inner elastic unit and a connection elastic unit, respectively; wherein a portion of the inner elastic unit of the first spring includes a first through hole corresponding to a first protrusion of the plurality of first protrusions; wherein a portion of the inner elastic unit of the second spring includes a second through hole corresponding to a first protrusion of the plurality of first protrusions; wherein a first protrusion of the plurality of first protrusions is disposed at a location corresponding to the first through hole; wherein a first protrusion of the plurality of first protrusions is disposed at a location corresponding to the second through hole; wherein the bobbin is coupled to the first spring where the inner elastic unit of the first spring meets the connection elastic unit of the first spring; wherein the bobbin is coupled to the second spring where the inner elastic unit of the second spring meets the connection elastic unit of the second spring; and wherein the coil block includes two distal ends, and one distal end of the coil block is electrically connected to the first spring by a solder and the other distal end of the coil block is electrically connected to the second spring by a solder.