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

摘要

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 arecord carrier."A record carrier (40) comprises a radiation-sensitive layer (43) upon a disc-shaped substrate (42) and isprovided with an information-recording area arranged inaccordance with a spiral-shaped or concentric pattern ofpreformed tracks (41). The track exhibits a track modulationin the form of a radial wobble whose frequency is modulatedwith a position-information signal (Ip). Further, anapparatus (1) is disclosed fox forming the track patternduring the manufacture of the record carrier (40). When aninformation signal (Vi) is recorded on the record carrier(40) and the recorded signal is read an FM demodulationdevice (60) recovers the position-information signal Ip fromthe variations in the scanning beam (54, 54a) produced by thetrack modulation. Moreover, a clock signal for the purpose ofscanning-velocity control is recovered from these variationsin the scanning beam.(Figure 4.)