External magnetic field generation apparatus

Details External magnetic field generation apparatus External magnetic field generation apparatus

G - Physics

11

B

G11B 13/04 (2006.01) G11B 11/10 (2006.01) G11B 11/105 (2006.01)

Patent

CA 2081864

An external magnetic field generation apparatus is used for a recording and reproduction apparatus which records information on a magneto-optical recording medium based on a magnetic field modulation system and a light modulation system; it applies a magnetic field to the portion of the magneto-optical recording medium where a light beam is projected. The apparatus has a first electro-magnet, used for the magnetic field modulation system, for generating ana.c. magnetic field which is reversed at a high speed. The apparatus has a second electro-magnet, used for the light modulation system, for generating a strong d.c. magnetic field, and in which power consumption coincides with that of the first electro-magnet. The second electro-magnet is integral with the first electro-magnet. The apparatus has a driver for selecting one of the electro-magnets in response to a switching signal, the driver supplying power to the selected electro-magnet.

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