| 摘要 |
PROBLEM TO BE SOLVED: To conduct precise and good servo control of a spindle motor even through the load with respect to a disk is changed in recording/reproducing modes, a magnetic field forming head section is almost contacting with either one of inner or outer peripherals of the disk and the conditions of the surface of the disk and the conditions of the head section are changed. SOLUTION: In a 'recording mode', a magnetic field forming head section 3b conducts an information recording in an approximately contacting condition while an optical head section 3a is in a non-contacting condition to a disk 1 that is rotated by a spindle motor 2. In a 'reproducing mode', the section 3b is separated and an information reproducing is conducted by only the section 3a. A grounding pressure load detecting section 14 detects a grounding pressure load in the 'recording mode'. A TR direction load detecting section 17 detects the load in a TR direction by the section 3a. A signal processing section 12 which is inserted between an ADIP signal generator 6 and a spindle driver 4 selects a normal gain control section 12a and an UP gain control section 12b based on the detection results from the section 17 and 14 to conduct a servo control.
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