| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for detecting position of an actuator, capable of heightening a servo frequency band by increasing the resonance frequency by minimizing the distance between a scale and a driving part, and improving the disturbance suppression performance. SOLUTION: This actuator has an arm and a voice coil motor across a pivot, a coil of the voice coil motor is provided with a scale facing to a magnet close to the coil, and an optical path hole which communicates, from the yoke outward to the scale, is made in the magnet facing to the scale and a yoke, on which the magnet is mounted, and sensor light is irradiated from the yoke outward toward the scale through the optical path hole, and a photodetector for receiving the sensor light reflected by the scale or transmitted through the scale and reading the scale is provided. COPYRIGHT: (C)2009,JPO&INPIT
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