公开(公告)号：JPS63271783A

公开(公告)日：1988-11-09

申请号：JP10576787

申请日：1987-04-29

Applicant: SONY CORP

Inventor： MASUDA HISASHI ,  OKA MICHIO ,  NAITO MINE ,  TOSAKA SUSUMU

IPC: G11B23/03 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To satisfactorily record signals by providing an auxiliary magnetic field generating member in the main body of a hermetic disk cartridge so that a sufficient magnetic field is supplied to a recording medium of a magneto- optical disk. CONSTITUTION:A cartridge main body 2 has a hermetic structure to store a disk 3 hermetically to the outside air and secures the complete air tightness inside. A fixed magnet 22 is fixed as an auxiliary magnetic field generating member opposite to an objective lens 12 of a pickup 10 centering on the disk 3. In such constitution where the magnet 22 is added into the main body 2, a sufficient auxiliary magnetic field is supplied to the disk 3 stored in the main body 2. Thus the signals are satisfactorily recorded.