Patent ID: 7013475

Claim:
A recording and reproducing apparatus 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; a motor configured to rotate said turntable with said optical disk placed thereon; and a recording and reproducing unit configured to record the information with respect to the rotating optical disk or reproduce the recorded information from the rotating optical disk, 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 has 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.