G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1, 352/32
G11B 7/007 (2006.01) G11B 7/004 (2006.01) G11B 7/013 (2006.01) G11B 7/26 (2006.01) G11B 23/00 (2006.01) G11B 27/19 (2006.01) G11B 27/30 (2006.01)
Patent
CA 1322052
ABSTRACT: "Optically readable record carrier for recording information, method and apparatus for manufacturing such a record carrier, apparatus for recording information on such a record carrier, and apparatus for reading information recorded on such a record carrier." A record carrier (40) comprises a radiation- sensitive layer (43) upon a disc-shaped substrate (42) and is provided with an information-recording area arranged in accordance with a spiral-shaped or concentric pattern of preformed tracks (41). The track exhibits a track modulation in the form of a radial wobble whose frequency is modulated with a position-information signal (Ip). Further, an apparatus (1) is disclosed fox forming the track pattern during the manufacture of the record carrier (40). When an information signal (Vi) is recorded on the record carrier (40) and the recorded signal is read an FM demodulation device (60) recovers the position-information signal Ip from the variations in the scanning beam (54, 54a) produced by the track modulation. Moreover, a clock signal for the purpose of scanning-velocity control is recovered from these variations in the scanning beam. (Figure 4.)
548386
Kuijpers Franciscus L. J. M.
Mulder Hendricus A. M.
Pasman Johannes H. T.
Raaymakers Wilhelmus P. M.
Veenis Aartje W.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
Kuijpers Franciscus L. J. M.
Mulder Hendricus A. M.
Pasman Johannes H. T.
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