| 摘要 |
A lens drive system includes a lens frame having a lens element; a nut member secured to the lens frame; a feed screw shaft having a male thread portion and a non-threaded portion, the male thread portion engaged with a screw hole of the nut member; an engagement portion formed on the nut member and having a deformable screw-engaging portion engaged with the male thread portion; and a motor for rotating the feed screw shaft. The screw-engaging portion is disengaged from the male thread portion when a large force is applied to the engagement portion in an axial direction. When the linear movement of the lens frame and the nut member is restricted during rotation of the feed screw shaft, the engagement portion remains on the male thread portion of the feed screw shaft while the female thread portion is moved onto the non-thread portion.
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