发明名称 |
OPTICAL DISC SYSTEM AND OPTICAL DISC. |
摘要 |
<p>A magneto-optical disc system which comprises a magneto-optical disc (40) provided with a translucent cover (41), an objective lens (2) for focusing a laser beam on a magnetic recording layer (43) of the magneto-optical disc (40) for recording/reproducing, and a magnetic field generating device (9) provided by forming a coil pattern (7) on an optical glass (8). The thickness (t2) of the translucent cover (41) is 0.6 - 0.1 mm, and the numerical aperture (NA) of the objective lens (2) is 0.55 - 0.70. Higher density recording/reproducing can be performed.</p> |
申请公布号 |
EP0473785(A1) |
申请公布日期 |
1992.03.11 |
申请号 |
EP19910903625 |
申请日期 |
1991.01.30 |
申请人 |
SONY CORPORATION |
发明人 |
WATANABE, TETSU, SONY CORPORATION;AOKI, YOSHIO, SONY CORPORATION |
分类号 |
G11B11/10;G11B7/00;G11B7/0037;G11B7/004;G11B7/135;G11B7/24;G11B11/105 |
主分类号 |
G11B11/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|