| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light quantity adjustment device which is free from operation failure and allows a diaphragm blade to be smoothly opened and closed. <P>SOLUTION: The light quantity adjustment device includes a substrate having an exposure aperture, a blade member for adjusting the quantity of light passing the exposure aperture, and driving means for driving the blade member. The driving means includes an electromagnetic coil, a magnet rotor, a coil frame where a reference surface for alignment with a rotation axis is formed, and a shielding yoke supported on the reference surface of the coil frame. The substrate comprises: a support surface for supporting the blade member movably; a recess provided on the support surface to house the driving member; a support part provided in the recess to support one end of the shielding yoke; and holding means which houses and supports the driving means in the recess so that one end of the shielding yoke is supported by the support part and the other end of the shielding yoke can be aligned with the reference surface of the coil frame. <P>COPYRIGHT: (C)2012,JPO&INPIT |
