Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1992-07-31
1994-07-19
Pascal, Robert J.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369116, G11B 1304
Patent
active
053316126
ABSTRACT:
A magneto-optical recording apparatus which records information through the processes of: first irradiating a light beam onto a magneto-optical recording medium having a recording film; and next applying an external magnetic field that is inverted in response to a recording signal onto the recording film while continuing the first process. In the above arrangement, the intensity of the light beam is dropped upon inversion of the external magnetic field so that information is not recorded. The intensity of the light beam is raised during non-inversion of the external magnetic field so that information is recorded. Further the magneto-optical recording apparatus is provided with a light intensity control device for varying the intensity of the light beam dependent of the lengths of recording bits so that the high-temperature area of the recording film is not widened. Since the width of the recording bits is uniformly maintained, the remaining of the recording bit after overwriting operation can be reduced; thus, the signal quality in reproduction can be enhanced.
REFERENCES:
patent: 4843604 (1989-06-01), Fujiwara et al.
patent: 4984816 (1990-01-01), Sukeda et al.
patent: 5175721 (1992-12-01), Nakayama et al.
Patent Abstracts of Japan, Publication No. JP55139693; Publication Date Oct. 31, 1980.
"Magneto-Optical Recording with Optical Modulation and Magnetic Field Modulation" Reports of Japan Applied Magnetics Institute, vol. 15, No. 2, 1991 pp. 225-228 (translation of relevant passages enclosed).
"Magneto-Optical Recording with Optical and Magnetic Field Modulation Methods" Proceedings of Magneto-Optical Recording International Symposium '91, J. Magn. Soc. Jpn., vol. 15, Supplement No. S1 (1991), pp. 327-330).
Murakami Yoshiteru
Ohta Kenji
Takahashi Akira
Conlin David G.
Dinh Tan
Fournier Kevin J.
O'Connell Robert F.
Pascal Robert J.
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