Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1992-07-31
1995-03-14
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369283, G11B 724
Patent
active
053982320
ABSTRACT:
An optical recording medium is provided with optical guide grooves and prepits representing for example address data, in a land portion sandwiched between the grooves. The reflectivity in the bottom portion of the prepits is made higher than that of the land portion. An antireflection film is provided on the medium such that, in case where the reflectivity of the antireflection film decreases with the increase in the thickness of the antireflection film, the thickness of the antireflection film on the bottom of the prepits is selected smaller than that on the land portion. In the case where reflectivity of the antireflection film increases with the increase in the thickness of the antireflection film, the thickness of the antireflection film on the bottom of the prepits is selected larger than that on the land portion.
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Beyer James
Canon Kabushiki Kaisha
Dzierzynski Paul M.
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