发明名称 |
High density recording method for magneto-optical disc and magneto-optical recording and reproducing apparatus. |
摘要 |
<p>Data can be overwritten at high density by a simple arrangement and with a small energy. Also, data of high recording density can be accurately recorded and reproduced by a simple arrangement. An alternating field having the same frequency as that of a recording fundamental clock generated by a PLL circuit (8) is generated by a coil (5) that constructs a tank circuit (7) and then applied to a magneto-optical disc (1). A phase of the recording fundamental clock is modulated by a phase modulating circuit (12) in association with recording data and a pulse synchronized with leading edge and trailing edge of such clock is generated by a pulse generating circuit (13). An optical pickup device (4) irradiates the magneto-optical disc (1) with a laser light in synchronism with the pulse. Therefore, a high density recording method in which the edge position of pit is shifted stepwise in association with data to be recorded can be applied to a magneto-optical recording in which a pit is formed by partially inverting a magnetization of a magneto- optical film of the magneto-optical disc (1). <IMAGE></p> |
申请公布号 |
EP0578227(A2) |
申请公布日期 |
1994.01.12 |
申请号 |
EP19930110879 |
申请日期 |
1993.07.07 |
申请人 |
SONY CORPORATION |
发明人 |
TSUKAMURA, YOSHIHIRO;KOBAYASHI, SEIJI;OKAMURA, HIROSHIGE |
分类号 |
G11B27/034;G11B7/00;G11B11/105;G11B20/10;G11B27/036;(IPC1-7):G11B11/10 |
主分类号 |
G11B27/034 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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