Patent ID: 6226245
Filing Date: 2001-05-01
Classification: G11B

Abstract:
A system for reading information recorded on a disc comprising:a reading device for reading information recorded on an optical disc;a rotating device for rotating the optical disc;control means for controlling the rotational device so as to rotate the disc at a higher speed than an ordinary speed;detector means for detecting a relative displacement between the reading device and the optical disc, caused by rotating the disc by the rotating device at a speed higher than an ordinary speed under the control of the control means;determining means for determining that the displacement reaches a predetermined allowable value;rotating speed detector means for detecting a maximum rotating speed of the optical disc within a range dependent on the predetermined allowable value;the control means being provided for controlling the rotating device so as to rotate the optical disc at an angular velocity which does not exceed the maximum rotating speed detected by the rotating speed detector means, anda memory for storing a predetermined allowable value.