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    • 30. 发明授权
    • Magneto-optical disk
    • 磁光盘
    • US5654058A
    • 1997-08-05
    • US310006
    • 1994-09-21
    • Fumiyoshi KirinoHarukazu MiyamotoShigenori OkamineNoriyuki OgiharaMasahiko TakahashiNorio OhtaToshio Niihara
    • Fumiyoshi KirinoHarukazu MiyamotoShigenori OkamineNoriyuki OgiharaMasahiko TakahashiNorio OhtaToshio Niihara
    • G11B11/105G11B5/66
    • G11B11/1053G11B11/10586G11B11/10589G11B11/10591G11B11/10593G11B11/10508G11B11/10519Y10S428/90
    • In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer, a magneto-optical recording layer, a second dielectric layer and a metallic layer, laid on a disk substrate provided with guide tracks, temperature distribution of the magneto-optical recording layer is controlled by controlling the thermal diffusivity of the metallic layer, and recording/reproduction/erasing repetition characteristics are improved thereby. In the disk of the present structure, the temperature is elevated in a broader area from the center of laser beam, and thus a thoroughly broad erasing domain width taking a track offset into account can be obtained and no recording domains remain after the erasing. The reproduced signal output is increased by 4 dB, as compared with that obtained by a disk of three-layer structure without any metallic layer, because the beam utilization efficiency is increased owing to both Kerr effect and Faraday effect. When the disk of the present structure is subjected to field modulation recording, tails of arrow-feather-shaped recording domains peculiar to the field modulation recording can be shortened and interbit interferences can be overcome, resulting in an increase in C/N (S/N) ratio and the high density recording can be made.
    • 在用于用激光束记录,再现或擦除的磁光盘中,其包括由第一介电层,磁光记录层,第二电介质层和金属层组成的四层结构的膜,铺设 在设置有导轨的盘基板上,通过控制金属层的热扩散率来控制磁光记录层的温度分布,从而提高记录/再现/擦除重复特性。 在本结构的盘中,从激光束的中心向较高的区域升温,从而可以获得考虑到磁道偏移的完全宽的擦除域宽度,并且在擦除之后不会留下记录域。 与没有任何金属层的三层结构的盘相比,再现信号输出增加了4dB,因为由于克尔效应和法拉第效应都增加了光束利用效率。 当本结构的磁盘进行现场调制记录时,可以缩短磁场调制记录特有的箭头 - 羽状记录区的尾部,并克服间断干扰,导致C / N(S / N)比,并且可以进行高密度记录。