Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2007-06-26
2007-06-26
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
Reexamination Certificate
active
10238698
ABSTRACT:
An optical information recording medium including a ROM region in which pits are previously formed at a track pitch (P); and a RAM region including a groove which is to be exposed to laser light to form at least one of a pit and a mark therein and to record information to be reproduced, wherein the pits in the ROM region are wobbled in a radius direction of the recording medium, a wobbling inter-pit groove is formed along the wobbled pits, wherein the width (W) of the inter-pit groove is narrower than that of the groove in the RAM region. The ratio (W/P) of the width (W) of the inter-pit groove to the track pitch (P) is preferably from 0.2 to 0.4.
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Fujiwara Yasuhide
Sawada Yasuo
Cooper & Dunham LLP
Hindi Nabil
Ricoh & Company, Ltd.
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