G - Physics – 11 – B
Patent
G - Physics
11
B
352/32
G11B 7/00 (2006.01) G02B 7/04 (2006.01) G11B 11/105 (2006.01) H04N 5/7826 (2006.01)
Patent
CA 1177577
TITLE OF THE INVENTION: Magnetooptical Recording Medium and Recording-and-Reproducing Device Using the Same ABSTRACT OF THE DISCLOSURE: A Kerr-magnetooptical-effect type recording-and- reproducing device using a recording disk comprising a substrate and magnetic thin films formed over both the major surfaces of the substrate in such a way that their easy directions are perpendicular to the substrate and both the films are magnetized in the same, for instance, upward direction. An optical converging lens and a permanent magnet, which is movable in parallel with or perdencular to the recording disk and rotatable about its axis, are disposed on the opposite sides, respectively t of the recording disk in opposing relationship. A bit is written into or erased from the upper thin film by setting the permanent magnet in such a way that the upwardly or downwardly pointed field is applied to a desired bit yield simultaneous with the focusing of 2 laser beam at the field so as to heat it to a temperature above a Curie point. In like manner the writing or erasing of the lower thin film is effected, but the direction of the write or erasing field is reversed; that is, the downwardly or upwardly pointed field is applied. - 1 -
381783
Birukawa Masahiro
Kawabata Hidetsugu
Muto Akira
Gowling Lafleur Henderson Llp
Matsushita Electric Industrial Co. Ltd.
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