Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1993-03-02
1995-03-28
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692752, 3692754, 369277, 369109, G11B 726
Patent
active
054024110
ABSTRACT:
An optical disk is adapted for use in an optical disk unit which irradiates a light beam spot on a target track on the optical disk and controls tracking of the light beam spot based on a tracking error signal which is generated based on a reflected light beam from the optical disk. The optical disk includes a disk shaped substrate, a spiral or concentric guide tracks provided on the substrate, a writable region provided on the substrate between two mutually adjacent track turns of the guide track, and a preformed track provided within the guide track and prerecorded with read-only information in a form of variations of a topological feature. The guide track and the topological feature have mutually different height positions so that a tracking error signal which is generated when the light beam spot scans the guide track has the same amplitude as a tracking error signal which is generated when the light beam spot scans the preformed track, and the height positions of the guide track and the topological feature are different from a height position which generates a maximum tracking error signal amplitude when scanned by the light beam spot.
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Maeda Miyozo
Miyabe Kyoko
Moribe Mineo
Satoh Susumu
Chu Kim-Kwok
Dzierzynski Paul M.
Fujitsu Limited
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