Magnetooptical recording method

Details Magnetooptical recording method Magnetooptical recording method

1992-09-28

1993-11-09

Pascal, Robert J.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 360114, G11B 1100, G11B 502, G11B 5127

Patent

active

052609219

ABSTRACT:
Magneto-optical recording method for a magneto-optical recording disk using a non-flying magnetic head. The magnetic head produces a magnetic field extending from a primary magnetic pole and returning to an auxiliary magnetic pole while the disk is rotated. The magnetic head is spaced apart from one major surface of the disk such that the primary magnetic pole applies a magnetic field across the disk. Magneto-optical recording is effected in a magnetic field-modulation mode while properly controlling the projected area of the primary magnetic pole and the distance between the magnetic head and the disk surface. A satisfactory C/N is obtained in a consistent manner while jitter is reduced.

REFERENCES:
patent: 4843600 (1989-06-01), Miyajima et al.
patent: 4890178 (1989-12-01), Ichihara
patent: 5095470 (1992-03-01), Oka et al.
patent: 5148415 (1992-09-01), Takeuchi
patent: 5197049 (1993-03-01), Wehrenberg
1990 Autumn National Convention Record, The Institute of Electronics, Information and Communication Engineers, Oct. 14, 1990. Magnetic Recording Head for Magnetic Field Modulation Magneto-Oprtical Disk Tester; S. Urabe, A. Ohya and K. Mikuriya.
Sanyo Technical Review, vol. 22, No. 3, Oct. 1990 Magneto-Optical Recording by Magnetic Field Modulation Method, S. Sumi et al.
Reports at the Institute of Electronics, Information and Communication Engineers, Study of Magnetic Head for Magneto-Optic Recording with Magnetic Field Modulation, Takehiro Nagaki, Feb. 23, 1988.
Id.; Development of Magneto-Optical Compact Disc Recorder Using An Active Head-to-Disc Spacing Control Method, S. Sugaya et al., Nov. 22, 1990.

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