Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1993-12-13
1996-12-03
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369117, 369109, 369 44110, 369 44120, G11B 700
Patent
active
055815324
ABSTRACT:
An apparatus for recording and reproducing information on and from optical or opto-magnetic information recording media is disclosed. The apparatus comprises an irradiation device for irradiating a light beam polarized in a predetermined direction to an opto-magnetic recording medium an, application device for applying a predetermined magnetic field to the recording medium, an optical device for condensing the light beam obtained through the recording medium, and a detector for detecting the light beam condensed by the optical device. The detector has an effective light receiving surface almost equal to the airy disk size determined by the resolving power of the optical device. The apparatus precisely detects edges of information magnetic domains by using the S-polarized component produced by the opto-magnetic recording medium under the magnetic Kerr effect.
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Hoshi Hiroaki
Matsumura Susumi
Morishima Hideki
Yamaguchi Eiji
Yamamoto Masakuni
Canon Kabushiki Kaisha
Edun Muhammad N.
Epps Georgia Y.
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