| 摘要 |
PROBLEM TO BE SOLVED: To increase the rigidity of a carriage, to reduce an FPC spring resisting force, to increase torque linearity and to reduce carriage thermal deformation in a magnetic disk device. SOLUTION: An actuator includes a yoke 9C provided in a base 8A, two groups of driving coils 9A and 9B and a permanent magnet 10 provided in a carriage 3. The two coils 9A and 9B are disposed away from each other in the yoke 9C such that an angleβformed by crossing between the extended lines of the effective coil parts (line bundle part) of the driving coils 9A and 9B for contributing to the generation of a propelling force is set within a range of 7 to 10 degrees. The planar shapes of the driving coils 9A and 9B are formed to be nearly triangular, the rear end part outer shape of the permanent magnet 10 is nearly coincided with the inner peripheral shape of each of the driving coils 9A and 9B and, even when a head 1 is located in an innermost peripheral position or an outermost peripheral position, magnetic interference is prevented between a line flux adjacent to the driving coils not contributing to the generation of a propelling force and the permanent magnet 10.
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