Patent ID: 9140884
Filing Date: 2015-09-22
Classification: G02B,H02K

Abstract:
1. A voice coil motor, comprising: a mover including a bobbin including a lower bobbin portion having a lens secured therein and a plurality of upper bobbin portions protruded from the lower bobbin portion in a direction parallel to an optical axis of the lens, and a coil secured to a periphery of the bobbin; a stator including a yoke fixing at least one magnet facing the coil; and an elastic member coupled to the bobbin and the yoke, and elastically supporting the bobbin, wherein the yoke comprises an upper plate, a lateral plate, and a plurality of rotation prevention plates, wherein the upper plate has an opening for exposing the bobbin, and the lateral plate is bent from the upper plate, and the rotation prevention plates are bent from the upper plate to face the lateral plate, wherein the plurality of upper bobbin portions is intermittently protruded from an upper surface of the lower bobbin portion, and the plurality of upper bobbin portions are separated from each other so that each of the plurality of upper bobbin portions only contacts the bobbin at the upper surface of the lower bobbin portion, wherein each of the plurality of rotation prevention plates of the yoke has a first height, and each of the plurality of upper bobbin portions has a second height taller than the first height, wherein the rotation prevention plates and the plurality of upper bobbin portions are configured to inhibit the bobbin from rotating, and wherein the voice coil motor is configured such that a gap for ascending and descending the bobbin is formed between a distal end of each of the rotation prevention plates and the upper surface of the lower bobbin portion facing each of the rotation prevention plates.