| 摘要 |
<p>[PROBLEMS] To provide a lens drive device capable of moving a lens without rattling, vibration, and hysteresis by using an air-core stepping motor and allowed to reduce size. [MEANS FOR SOLVING PROBLEMS] This lens drive device (1) comprises the air-core stepping motor (20) having a stator (21) with a coil (25) and a magnet (23) rotatably stored in the stator (21). A lead screw (31) is formed in the inner surface of the magnet (23). In the magnet (23), the lens (L1) is axially movably guided by guide pins (41) and locked so as not to be rotated. A ball (37) brought into contact with the groove of the lead screw (31) and a screw member (35) formed of a spring (36) energizing the ball (37) toward the groove are installed in the holder (33) of the lens (L1). The lens (L1) can be guided by the guide pins (41) so as to be less vibrated in the radial direction, and the swing in the radial direction and the rattling in the optical axis direction of the magnet (23) and a screw feed mechanism can be absorbed by the screw member (35).</p> |
