Optical record carrier having position indentifying track modulation
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United States of America Patent
Stats
-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Dec 9, 1987
filing date -
Jul 10, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for recording and/or reading an information signal (V.sub.i) on an elongated track (4) of an optically readable record carrier (1). A position-identifying signal (V.sub.p) which is synchronous with a clock signal is recorded on the track 4 by modulating the transverse excursion of the track, the signal V.sub.p indicating the instantaneous position along the track at which the information signal V.sub.i is located. The frequency band of the position-identifying signal V.sub.p is situated substantially outside the frequency band of the information signal V.sub.i. In manufacturing such a record carrier, the deflection of a recording beam of radiation in a direction substantially transverse to the track is modulated by the position-information signal V.sub.p.
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