| 摘要 |
<p>A lens unit, wherein a follower section and a cam groove are joined to each other via the cam through a linear movement guiding section to allow a movement frame to be moved in the light axis direction along the linear movement guiding section. The follower section is provided with contact surfaces adapted to move while being in contact with side surfaces of the cam groove, and also with auxiliary surfaces provided near the contact surfaces and moving while maintaining gaps relative the side surfaces of the cam groove, the gaps having a magnitude smaller than the magnitude of elastic deformation of the contact surfaces. Because of the configuration, the area of the contact is small in a normal drive condition, and when an impact is applied, the auxiliary contact surfaces make contact with the side surfaces of the cam groove before the contact surfaces are crushed. The configuration increases the area of the contact to reduce drive loss in the normal drive condition and makes the lens unit small in size and highly resistant to impact.</p> |
