| 摘要 |
Disclosed is a lens actuator for focusing, with which a lens can be moved in an optical axial direction to a predetermined position through the control of a user to adjust focus. The lens actuator for focusing comprises: a bracket in which a retaining groove extends along an optical axial direction of an actuated lens; and a dial for focusing rotatably supported by the bracket, and including a ring-shaped groove offset from a rotation center at one or more body surfaces. The lens actuator for focusing further comprises: a guide projection inserted into the ring-shaped groove; a protruding portion inserted into the retaining groove of the bracket; and a lens-actuating member including a lens-actuating shaft extending out from the bracket. The lens actuator for focusing may further comprise a lens-actuating member housing which is fixed to a lens assembly housing, and which houses the aforementioned elements. The lens actuator for focusing may further comprise buffering means configured to buffer external shocks applied to the dial. When the dial is rotated in a predetermined direction, the lens-actuating shaft is moved forward and backward by a predetermined distance in an optical axial direction by means of the combined forces imparted by the offset ring-shaped groove guiding the guide projection and the retaining groove allowing the protruding portion to move in an optical axial direction, but not in a direction of the lens-actuating shaft that is perpendicular to the optical axial direction. Thus, the actuated lens inserted into and fixed to the lens actuating shaft is moved forward and backward by a predetermined distance in an optical axial direction. |
