| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens module that is highly precise and excels in reliability by stabilizing an amount of movement of an optical lens of an impact drive system. <P>SOLUTION: The lens module has a piezoelectric ceramic element at the other end of a magnet, and uses the vibration of the piezoelectric ceramic element as a driving force. While a moving body 35 and one end of the magnet 21 are attracted, the lens module moves a driven body along the optical axis of an optical lens 10. In the driven body, the moving body 35 that is attracted to the magnet 21 is formed in part of a lens holder 41 that has the optical lens 10. The weight m (unit: g) of the driven body is 0.035 F or less relative to the dynamic frictional force F (unit: mN) of a sliding part between the magnet 21 and the moving body 35. Where the force with which the magnet attracts the moving body is P (unit: mN), and the maximum distance between the gravity center of the driven body and the sliding part when the moving body is located at the end of the driving range is L, the length of the magnet 21 in the sliding direction is set to 2LF/P or greater. <P>COPYRIGHT: (C)2009,JPO&INPIT |
