Spindle motor control system for disk player and spindle motor control method

• Main Authors: KAZUHIRO TESHIROGI, KATSUOSHI SUMIDA, MASANOBU SHIMIZU
• Format: Patent
• Language: English
• Published: 01.10.2003
• Edition: 7
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

In a CLV control of a spindle motor, a clock extracting unit (5) extracts a clock component from the reproduction data, and a CLV control unit (6) controls the spindle motor (8) in accordance with the extracted clock component to rotate the optical disk in a CLV mode, while a rotational velocity detecting unit (14, 15) detects a frequency or period value corresponding to a rotational velocity of the spindle motor (8) and a CAV control unit (16) controls the spindle motor (8) in accordance with the rotational velocity of the spindle motor detected by the rotational velocity detecting unit to thereby rotate the optical disk in a CAV mode. When a clock component supervisory unit (9) judges that the extracted clock component is within a given range, the first drive signal (Smdl) generated by the CLV control unit (6) is used for rotation in the CLV mode, and when judged that the extracted clock component is beyond the given range, the second drive signal (Smdr) generated by the CAV control unit (16) is used for rotation in the CAV mode.