Patent ID: 7047544

Claim:
An optical disk drive comprising: a turntable configured to carry an optical disk with a clamping plate made of a magnetic material attached in a vicinity of a clamping area thereon; a magnet configured to attract said clamping plate of said optical disk placed on said turntable to a turntable side in a noncontact state; and a motor configured to rotate said turntable with said optical disk placed thereon, wherein the attraction force of said magnet attracting said clamping plate is a value by which bending of said optical disk accompanied with the attraction of said clamping plate becomes within a permissible error range, and said attraction force is a value by which said optical disk does not detach from the top of said turntable when said optical disk is rotated by about 60 degrees for about 0.25 second around a vertical axis vertical to the rotation axis of the rotation of said optical disk by said motor.