Optical recording system with optical recording medium having multilevel recording surface for tracking
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United States of America Patent
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Nov 7, 1989
Issued Date -
N/A
app pub date -
Jan 19, 1989
filing date -
Sep 20, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical recording medium which has data tracks and tracking lines juxtaposed with each other in a data recording region so as to write/read data into/from the data tracks, using the tracking lines as a reference. The data recording region is so configured as to have recessed portions and raised portions arranged alternatingly and extending along each other in a direction of data reading/writing. The so formed recessed portions and raised portions provide data tracks. With this configuration, the boundary edges between the respective recessed portions and the respective raised portions are used as tracking lines, so that data can be written in the recessed or raised portions, referring to the boundary edges as tracking lines.
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