Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1991-03-15
1994-01-04
Psitos, Aristotelis
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692755, 369 59, G11B 370, G11B 700
Patent
active
052766748
ABSTRACT:
An optical recording medium includes a substrate, a recording layer formed on the substrate and a transparent protective layer applied to the recording layer. By reducing the thickness of the transparent protective layer to less than 1 mm, it is possible to make the numerical aperture (NA) of an objective lens larger. This structure can achieve a high recording density. Such a thin transparent protective layer causes signal degradation due to dust adhered to the surface of the recording layer and the generation of frequent errors. However, such frequent errors can be corrected by specifying the interleave length and the number of parity symbols added to a code word that constitutes the product code.
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Matsushita Electric - Industrial Co., Ltd.
Psitos Aristotelis
Tran Thang V.
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