Magneto-optical overwriting methods using erasing pulses, each o

Details Magneto-optical overwriting methods using erasing pulses, each o Magneto-optical overwriting methods using erasing pulses, each o

1991-02-14

1992-09-01

Nguyen, Hoa

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 59, 360 59, G11B 1304, G11B 1110, G11B 1112

Patent

active

051446014

ABSTRACT:
A method of overwriting information in a magneto-optical memory medium which includes a simultaneous writing and erasing step of continuously irradiating a written information-carrying area of the recording layer of the memory medium with two different pulses from a single laser beam head in accordance with information to be written, regardless of the presence or absence of written information. A variation includes irradiating the written information-carrying area with an erasing pulse from a laser beam head, regardless of the presence or absence of written information, and the then selectively irradiating the information-erased area with a writing pulse from another laser beam head in accordance with information to be written. According to these methods, it becomes possible to carry out a simple and high-speed overwriting with an increased and stabilized bit positioning accuracy.

REFERENCES:
patent: 4679180 (1987-07-01), Kryder et al.
patent: 4882718 (1989-11-01), Kryder et al.
Shieh et al., IEEE Transactions on Magnetics, vol. Mag. 23 No. 1, Jan./1987, pp. 171-173.
Patent Abstracts of Japan, vol. 8, No. 237 (P-310) (1674) Oct. 30, 1984, & JP-A-59 113506 (Nippon Denki K.K.) Jun. 30, 1984.
Applied Physics Letters, 49 (8), Aug. 25, 1986, "Magneto-Optic Recording Materials with Direct Overwrite Capability", Han-Ing Shieh et al., pp. 473-474.

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