REPRODUCTION POWER DETECTION METHOD AND DEVICE, REPRODUCTION POWER CONTROL METHOD AND DEVICE, AND REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To perform control so that the reproduction power of a light beam can be optimized rapidly and optimally when reproducing data from a high- density recording magnetooptical record medium. ;SOLUTION: A magnetic domain separation region (non-magnetic region) is provided in a zigzag at both sides in the radial direction of the magnetooptical disk of the recording track of data. A modulation frequency component according to the zigzag of the magnetic domain separation region is detected from a reproduction signal RF, and the amplitude level of the modulation frequency component is detected from a band-pass filter 211 by a detection circuit 212. The reproduction power of a light beam is controlled according to the amplitude level of the modulation frequency component.;COPYRIGHT: (C)2000,JPO