发明名称 |
IMPROVEMENTS RELATING TO DATA STORAGE AND RECORDING |
摘要 |
An optical data storage medium is disclosed for use in an optical read/write system using an optical read wavelength of W, the medium including a textured region having raised areas and depressed areas disposed in a regular array with a period (pitch) not greater than W. The medium comprises a substrate; a layer or a plurality of zones of magneto-optic material; and a layer or a plurality of zones of an optically reflective material (which may or may not be the same as and/or constituted by the magneto-optic material). The magneto-optic material is disposed so as to be accessible to incident optical radiation. In one embodiment, the texture is shallow, being generally in the range 10 to 50 nanometers. In a second embodiment, the depth of the texture is at least one tenth of the value of W. The texture can take the form of a grating, or of crossed gratings, or be defined between an array of protuberances; structures with sinusoidal, square-wave (top-hat) or saw-tooth profile are advantageous. |
申请公布号 |
EP0110730(A3) |
申请公布日期 |
1984.07.11 |
申请号 |
EP19830307424 |
申请日期 |
1983.12.06 |
申请人 |
COMTECH RESEARCH UNIT LIMITED |
发明人 |
HUMBERSTONE, VICTOR CAREY;PETTIGREW, ROBERT MARTIN;HELFET, PETER ROY |
分类号 |
G11B11/10;G11B7/24;G11B7/241;G11B7/26;G11B11/105;G11C13/06;H01F10/26;(IPC1-7):G11B7/24 |
主分类号 |
G11B11/10 |
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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