公开(公告)号：JPH05189827A

公开(公告)日：1993-07-30

申请号：JP1220491

申请日：1991-02-01

Applicant: IBM

Inventor： BURAIAA AIAN FUINKERUSUTAIN ,  MOROBATSUTO TAIEFUEE ,  UENO SHIGEO

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B20/18 ,  G11B27/36

Abstract: PURPOSE: To provide a calibration method and device thereof for making the power level of a laser suitable for writing to a magneto-optical recording medium to the sensitivity of the medium. CONSTITUTION: One of calibration tracks fixed in the direction of the diameter of a magneto-optical disk 30 is selected, and the selected track is erased with high power by a laser device 67 under the control of a control circuit 66, and one test pattern is repeatedly written in the selected tracks by using plural different levels. Then a recorded test pattern is read to envelope-detect the amplitude of the read signal, and a microprocessor 40 prepares a table expressing a signal envelope and applies the envelope to the curve. Based on the curve, a maximum reading signal amplitude is detected to detect laser power for writing by which the maximum amplitude is obtained, to make the power reference for laser power for actual writing and designating laser power for erasing.