Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1990-10-01
1992-06-30
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369127, 369146, 360 59, 360114, G11B 1114, G11B 300, G11B 502, G11B 5127
Patent
active
051269848
ABSTRACT:
An external magnetic field generating device for an optical magnetic disk apparatus is arranged radially of the disk and is used to record information on and erase information from the disk by a laser beam. A surface of the external magnetic field generating device which is remote from the optical magnetic recording disk is made substantially parallel to the disk surface so as to facilitate mounting of the device. A surface of the external magnetic field generating device which faces the disk includes an inclined portion and is shape such that the intensity of the external magnetic field increases as the magnetic field approaches an outer end of the device so as to enable appropriate recording and erasing at both inner and outer peripheries of the disk.
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patent: 4644431 (1987-02-01), Kishine et al.
patent: 4731683 (1988-03-01), Otomo et al.
patent: 4748606 (1988-05-01), Naito et al.
patent: 4849952 (1989-06-01), Shiho
patent: 4901185 (1990-02-01), Kubo et al.
Levy Stuart S.
Nguyen Tan
Nikon Corporation
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