Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1993-07-29
1994-08-16
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 4426, 3692753, 3692754, 369278, 358342, G11B 700
Patent
active
053393015
ABSTRACT:
A record carrier on which information may be optically recorded and/or read, having a disc-shaped substrate with a spiral or concentric pattern of preformed tracks thereon and a radiation-sensitive layer extending over such track pattern. The tracks are in the form of ridges of substantially constant width and having a periodic radial wobble of a substantially constant mean frequency, which frequency is modulated by a position-information signal identifying the relative positions of the tracks in the track pattern. Apparatus for forming such a track pattern includes means for modulating the radial track wobble in accordance with the position-information signal. Apparatus for reading an information signal recorded on such a record carrier includes an FM demodulator for recovering the position-information signal from variations in the reflected scanning beam produced by the track modulation, and which also recovers from such variations a clock signal corresponding to the mean frequency of such modulation and which is used to control the scanning velocity. Apparatus for recording an information signal on such a record carrier includes an FM demodulator for recovering the position-information signal from variations in the radiation reflected from the tracks during recording.
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Kuijpers Franciscus L. J. M.
Mulder Hendricus A. M.
Pasman Johannes H. T.
Raaymakers Wilhelmus P. M.
Veenis Aartje W.
Eason Leroy
U.S. Philips Corporation
Young W. R.
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