发明公开
EP0913818A1 MAGNETO-OPTICAL RECORDING MEDIUM, ITS REPRODUCING METHOD AND REPRODUCER
失效
澳大利亚新泽西州,吉尔吉斯斯坦州的MAGNETOOPTISCHES WIEDERGABEVERFAHREN- UNDGERÄT
- 专利标题: MAGNETO-OPTICAL RECORDING MEDIUM, ITS REPRODUCING METHOD AND REPRODUCER
- 专利标题(中): 澳大利亚新泽西州,吉尔吉斯斯坦州的MAGNETOOPTISCHES WIEDERGABEVERFAHREN- UNDGERÄT
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申请号: EP97930771.7申请日: 1997-07-11
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公开(公告)号: EP0913818A1公开(公告)日: 1999-05-06
- 发明人: OONUKI, Satoru , YOSHIHIRO, Masafumi , NAGAI, Nobuyuki , SHIMAZAKI, Katsusuke , AWANO, Hiroyuki , SHIRAI, Hiroshi , OHTA, Norio , SUMI, Satoshi , YAMAGUCHI, Atsushi
- 申请人: HITACHI MAXELL, LTD. , SANYO ELECTRIC Co., Ltd.
- 申请人地址: 1-88, Ushitora-1-chome, Ibaraki-shi Osaka-fu 567 JP
- 专利权人: HITACHI MAXELL, LTD.,SANYO ELECTRIC Co., Ltd.
- 当前专利权人: HITACHI MAXELL, LTD.,SANYO ELECTRIC Co., Ltd.
- 当前专利权人地址: 1-88, Ushitora-1-chome, Ibaraki-shi Osaka-fu 567 JP
- 代理机构: TER MEER STEINMEISTER & PARTNER GbR
- 优先权: JP182900/96 19960712
- 国际公布: WO9802877 19980122
- 主分类号: G11B11/10
- IPC分类号: G11B11/10
摘要:
A magneto-optical recording medium (11) has a second auxiliary magnetic film (4), a first auxiliary magnetic film (5) and a magneto-optical recording film (6) in this order from the laser beam applied side. If the temperatures of the first and second auxiliary magnetic films (4 and 5) exceed their critical temperatures T CR1 and T CR2 , the magnetization of the auxiliary magnetic films is changed from the surface magnetization to the vertical magnetization. The Curie points T C0 , T C1 and T C2 of the magneto-optical recording film (6), the first auxiliary magnetic film (4) and the second auxiliary magnetic film (5) and the critical temperatures T CR1 and T CR2 satisfy the relations room temperature CR2 CR1 C0 , T C1 and T C2 . The thickness of the first auxiliary magnetic film (4) is larger than the tickness of a magnetic wall. After the recording magnetic domain (22) of the magneto-optical recording film (6) is contracted and transferred onto the first auxiliary magnetic film (4) by the reproducing light application, it is expanded and transferred onto the second auxiliary magnetic film (5). Since an amplified reproducing signal can be obtained from an expanded magnetic domain (23), the magneto-optical recording medium is suitable for the reproduction of the high density recording.
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