Title:
DATA RECORDING/REGENERATING SYSTEM FOR OPTICAL MAGNETIC DISK
Document Type and Number:
Japanese Patent JPH04362551
Kind Code:
A
Abstract:
PURPOSE: To make the reference level of a regenerative RF signal constant for the optical magnetic disk.
CONSTITUTION: A bulk erasing is operated so as to provide a whole recording surface with the magnetic pole of a single direction by magnetizing a whole optical disk 1 in a strong magnetic field and then, the regenerative RF signal from a mirror surface existent in the address area of this optical magnetic disk is detected by a sample pulse P(M) at the time of regeneration. With this detected level as a clamp voltage the clamping of the regenerative RF signal regenerated by the data recording area is operated at a clamp circuit 11.
Inventors:
KAWASHIMA TETSUJI
KOBAYASHI SHOEI
CHIAKI SUSUMU
KOBAYASHI SHOEI
CHIAKI SUSUMU
Application Number:
JP16251091A
Publication Date:
December 15, 1992
Filing Date:
June 07, 1991
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B7/00; G11B7/005; G11B7/0055; G11B11/10; G11B11/105; (IPC1-7): G11B7/00; G11B11/10
Attorney, Agent or Firm:
Akio Waki