| 摘要 |
PROBLEM TO BE SOLVED: To achieve thinness of an operation drive unit without increase in a minimum operation voltage in a filter change-over device performing a reciprocal rotation drive of a rotation operation body and implementing a change-over operation of a filter.SOLUTION: A filter change-over device 1 comprises: a change-over member 2 that has a filter 2A and a transparent glass plate 2B lined in one axis direction; a support member 3 that supports the change-over member 2 freely slidable along the one axis direction; and an operation drive unit 4 that slides the change-over member 2 toward the one axis direction with respect to the support member 3. The operation drive unit 4 comprises: a rotation operation body 5 that is subjected to a reciprocal rotation drive with a drive axis 4A as a center; a disc-like magnet 40 that is provided integrally with the rotation operation body 5 with the drive axis 4A as the center; a thin tabular yoke 41 that is arranged along a diameter of the magnet 40 on one face side of the magnet 40; and a pair of coils 42A and 42B that flatly are wound on other face side of the magnet 40 so as to invert end magnetic poles of the yoke 41.SELECTED DRAWING: Figure 1 |
