| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a blade driving device for a camera, capable of operating a blade member by a small and simple structure and of holding the blade member at a home position when the blade driving device is not conducted. <P>SOLUTION: A blade driving device for a camera comprises: a bottom board 10 having an opening 10a which becomes a light path; a blade member 20 supported by the bottom board 10 and operating to open and close the opening 10a; and a drive ring 30 provided so as to rotate with respect to the bottom board 10, and the blade driving device is configured to operate the blade member 20 in association with the drive ring 30 rotating. The drive ring 30 is provided with a permanent magnet 31, and the bottom board 10 is provided with a coil 11, which rotates the drive ring 30 by electromagnetic force generated at the time of energization, and a magnetic member 12, which holds the drive ring 30 at a prescribed position by attracting it by electromagnetic force generated between the drive ring 30 and the permanent magnet 31 at the time of non-energization of the coil 11. <P>COPYRIGHT: (C)2012,JPO&INPIT |
