| 摘要 |
A camera auto-focus mechanism includes a frame having a first hollow cylinder. A second hollow cylinder including metal material is fit over the first cylinder and capable of moving relative to the first cylinder. A first lens is fixed to the frame, and a second lens is fixed inside the second cylinder, both lenses being axially aligned with the cylinders. An insulated conductive metal coil is wound around the first cylinder, and a spring joins the second cylinder and the first cylinder. When current is not applied to the coil, the second cylinder is held in a first position by the spring such that the first and second lenses form a first focal length. And, when current is applied to the coil, the second cylinder is held in a second position against a force of the spring such that the first and second lenses form a second focal length.
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