| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rotation control device for more accurately controlling rotation of an optical disk when recording information on a label surface and the like of the optical disk where recording tracks and like do not exist. <P>SOLUTION: The rotation control device SR for controlling rotation of the optical disk DK includes: a pulse generating section 2 directly connected with a spindle motor 1; a speed/phase comparing section 5 for generating a speed error signal Serd and a first phase error signal Ser1 which indicate rotation error based on each pulse in a pulse signal Sfg from the pulse generating section 2; a phase comparing section 8 for generating a second phase error signal Ser2 which indicates a rotation error based on each pulse equivalent to the timing of completion of one rotation of the optical disk DK; and a driver 10 for controlling rotation of the optical disk DK based on the generated speed error signal Serd, the first phase error signal Ser1 and the second error signal Ser2. <P>COPYRIGHT: (C)2009,JPO&INPIT |
