| 摘要 |
PURPOSE:To stably and smoothly drive a focus lens moving frame by holding a nut by a shaft for a bearing engaging the nut in addition to a driving shaft engaging the nut. CONSTITUTION:When the driving shaft 28b of a focus motor 28 rotates, the focus lens moving frame 23 engaging the nut 29a which engages the shaft 28b and is fitted onto the shaft 43 for the bearing moves in the direction of the optical axis 17. At this time, the shaft 43 is fitted in the nut 29a, so when the nut 29a engaging the frame 23 slides on the shaft 43, the nut 29a does not slant in the direction of the optical axis 17 and the frame 23 can stably and smoothly be driven. |
