Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1986-09-16
1989-07-18
Faber, Alan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
360 59, 360114, 365122, G11B 1114, G11B 1304
Patent
active
048499528
ABSTRACT:
A magnetooptical information recording apparatus is provided with a device for irradiating a magnetooptical recording medium with a light beam, and a device for applying a bias magnetic field to a portion, irradiated by the light beam, of the magnetooptical recording medium. The applying device is provided with a yoke member having a first projecting portion positioned in the vicinity of the irradiated portion and a second projecting portion spaced from the first projecting portion in a direction along the surface of the recording medium, wherein the distance of the second projecting portion from the first projecting portion at a closer side to the recording medium is smaller than that at a farther side to the recording medium.
REFERENCES:
patent: 1866631 (1932-07-01), Dorff et al.
patent: 2984825 (1961-05-01), Fuller et al.
patent: 4382269 (1983-05-01), Kato
patent: 4622614 (1986-11-01), Yamashita et al.
Schneider et al., the IBM Tech. Dis. Bulletin, vol. 19, No. 4, Sep. 1976, pp. 1296-1297.
Canon Kabushiki Kaisha
Faber Alan
Nguyen Hoa T.
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