Optically readable record carrier with servo track

Details Optically readable record carrier with servo track Optically readable record carrier with servo track

G - Physics

11

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352/32.1

G11B 7/24 (2006.01) G11B 7/007 (2006.01) G11B 7/013 (2006.01) G11B 11/105 (2006.01) G11B 20/14 (2006.01) G11B 27/034 (2006.01) G11B 27/19 (2006.01) G11B 27/30 (2006.01)

Patent

CA 1319984

PHN 12.399 17.05.1988 Abstract Optically readable record carrier of the inscribable type, apparatus for manufacturing such a record carrier, and apparatus for recording and/or reading information on/from such a record carrier. A record carrier (1) comprises a disc-shaped carrier provided with a radiation-sensitive layer (6) and is formed with a servo track (4). The servo track exhibits a track modulation in the form of a radial wobble whose frequency is modulated with a position-information signal (Fig. 2). Also revealed is an apparatus (Fig. 8) for forming the track pattern during manufacture of the record carrier (1). When an information signal (Vi) is recorded on the record carrier (1) and the recorded signal is read by means of a recording and/or read apparatus (Fig. 4) the position-information signal (Fig. 2) is recovered by means of an FM demodulator device (60) from variations in the scanning beam (55) which are produced by the track modulation. Moreover, a clock signal for the purpose of scanning-velocity control is recovered from said variation in the scanning beam. Furthermore, embodiments of the record carrier which are very suitable for recording EFM-modulated signals are described. (Figs. 1 and 2).

588615

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