Optical disk recording/reproducing apparatus and rotary drive therefor
 An apparatus for rotationally driving an optical disk in an optical disk recording and/or reproducing apparatus capable of recording or reproducing signals from disks having different sizes includes a spindle motor for rotationally driving a disk, a servo unit for controlling the rotation of the spindle motor, and a control unit for detecting an activation response state of the spindle motor upon starting, and switching a gain of the servo unit on the basis of the detection result. 
Sony Corporation
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inventional inventional inventional inventional
Hiroyuki Satoshi Hidekazu
Ito Kitani Hattori