| 摘要 |
A first yoke member is received on a first reference plane defined on a support body. A second yoke member is coupled to the first yoke member so as to define a space for accommodation of a voice coil between the first and second yoke members. The second yoke member is opposed to a second reference plane, different from the first reference plane, defined on the support body. A screw member is engaged with the second yoke member for movement in the direction intersecting the second reference plane. The second yoke member is received on the second reference plane of the support body based on the movement of the screw member. Even if a gap happens to exist between the second yoke member and the second reference plane due to dimensional errors, the second yoke member is reliably supported on the support body.
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