Optical disk device

Abstract

Abstract PURPOSE:To improve the reliability of high speed track access control and the recording/reproduction by measuring the quantity of eccentricity of an optical disk and applying recording/reproduction only when the eccentricity is within a prescribed value. CONSTITUTION:A signal from a detector by a head 10 radiating a light beam onto a track of an optical disk 1 is fed to a sensor arithmetic circuit 11 to turn off a switch 13, and an error signal TS representing the deviation on the track of a light spot generated every time a beam crosses the track by the eccentricity of the disk is inputted to a circuit 20 in driving the disk 1 and a signal CP subject to waveform shaping is inputted to a counter 21. A comparator 22 compares an output CO of the counter 21 with a signal on a comparison level C and when the eccentricity of the disk 1 exceeds a prescribed value, a signal COUNT is inputted to a latch circuit 23 to generate an over signal OVR, thereby applying control to evade the recording/reproduction.

Inventors

• 👤 Shigeo Hayashi
• 👤 成男 林

Bibliographic Details