Recording/reading apparatus for inscribable record carrier and i

Details Recording/reading apparatus for inscribable record carrier and i Recording/reading apparatus for inscribable record carrier and i

1988-11-01

1991-03-12

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

049998250

ABSTRACT:
A record carrier (1) in the form of a disc-shaped carrier provided with a radiation-sensitive layer (6) having a servo track (4). The servo track produces track modulation by having a radial wobble, or lateral periodic deviation whose frequency is modulated with a position-information signal (FIG. 2). Apparatus (FIG. 8) is presented which forms 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 recording and/or read apparatus (FIG. 4), the position-information signal (FIG. 2) is recovered by an FM demodulator device (60) from variations in the scanning beam (55) which are propduced by the track modulation. Moveover, a clock signal for the purpose of scanning-velocity control is recovered from this variation in the scanning beam. Furthermore, embodiments of the record carrier highly suitable for recording EFM-modulated signals are described.

REFERENCES:
patent: 4389681 (1983-06-01), Tanaka et al.

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