| 摘要 |
A cam (3) is rotarily driven by a motor and has a load surface with first and second sloping sections. The length and gradient of the first and second sloping sections determine an adjustment or movement area of the lens (1) along the optical axis. The lens is moved from one end to the opposite end of the adjustment range. The gradient of the first sloping section is less than that of the second sloping section.
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