Magneto-optical recording/reproducing device

G - Physics – 11 – B

Patent

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Details

G11B 11/10 (2006.01) G11B 5/00 (2006.01) G11B 5/127 (2006.01) G11B 5/187 (2006.01) G11B 13/04 (2006.01)

Patent

CA 2043995

A magneto-optical recording/reproducing device which records information by irradiating a light beam of constant intensity on a magneto-optical recording medium while simultaneously applying a magnetic field thereon through a recording magnetic head; and which reproduces the recorded information through a reproducing magnetic head. The magneto-optical recording medium has a magnetic film formed on a translucent substrate and the magnetic field applied through the recording magnetic head reverses in response to the information to be recorded. The recording magnetic head and the reproducing magnetic head are integrally provided on a single magnetic core in order to set their positions easily with respect to each other. By making a magnetic core end-face of the reproducing magnetic head smaller than a light beam spot, information recorded on areas smaller than the light beam spot can be reproduced. A large reproduced output may be achieved by using a magneto-optical recording medium which has a soft magnetic material layer made of soft magnetic material provided between the substrate and the magnetic film.

ispositif d'enregistrement/reproduction magnéto-optique qui, d'une part, enregistre de l'information en projetant un faisceau lumineux d'intensité constante sur un support d'enregistrement magnéto-optique tout en appliquant à celui-ci un champ magnétique au moyen d'une tête magnétique d'enregistrement; et qui, d'autre part, reproduit l'information enregistrée à l'aide d'une tête magnétique. Le support d'enregistrement magnéto-optique comporte une pellicule magnétique formée sur un substrat translucide et le champ magnétique appliqué au moyen de la tête magnétique d'enregistrement s'inverse en fonction de l'information à enregistrer. La tête magnétique d'enregistrement et la tête magnétique de reproduction sont intégrées sur un même noyau magnétique pour faciliter le réglage de leurs positions l'une par rapport à l'autre. Le fait qu'une surface de la tête magnétique de reproduction soit plus petite qu'un simple point de faisceau lumineux permet de reproduire de l'information enregistrée sur des secteurs plus petits que ce point. On peut obtenir un important rendement à la reproduction en utilisant un support d'enregistrement magnéto-optique comportant une couche d'un matériau à aimantation temporaire intercalée entre le substrat et la pellicule magnétique.

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