Optical recording medium
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United States of America Patent
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Aug 25, 1992
Grant Date -
N/A
app pub date -
May 3, 1989
filing date -
Jul 6, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical recording medium having at least one data track and at least one clock track including clock bits provided in a predetermined optical pattern, in which the clock track comprises regular, periodical clock bits arranged regularly in a line and at least one irregular clock bit disposed in the line, breaking the regularity of the periodical clock bits. When a PLL circuit is reinstated into a locked state after it has been unlocked, a leading word can be identified by the irregular clock bit provided in the clock track. This enables data reading thereafter to be accurate.
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