Optically readable record carrier with track variations which pr

Details Optically readable record carrier with track variations which pr Optically readable record carrier with track variations which pr

1980-04-14

1983-02-22

Konick, Bernard

Static information storage and retrieval

Addressing

Optical

369 44, 369 48, 369111, G11B 700

Patent

active

043750885

ABSTRACT:
Disclosed is a record carrier for storage of digital data which is provided with a first periodic track variation having a period corresponding to a frequency at which the power spectrum of the digital signals is at a zero level. The first track variation produces a corresponding modulation of the radiation when scanned by a beam so that a clock signal can be derived from the detected radiation for synchronizing readout or recording of the data. The record carrier is further provided with a second periodic track variation in a direction transverse to the track direction having a period of the same order of magnitude, and preferably equal to the period of the first periodic track modulation. The second track variation produces a corresponding modulation of the beam which is detected and is used to generate to a tracking signal, the clock signal being used as phase reference signal for demodulation of the tracking signal. If the periods of the two track variations are equal, low-pass filtering automatically yields the tracking signal.

REFERENCES:
patent: 3962720 (1976-06-01), Braat
patent: 3963862 (1976-06-01), Bouwhuis
patent: 4025784 (1977-05-01), Lehureau et al.
patent: 4059841 (1977-11-01), Bricot et al.
patent: 4065786 (1977-12-01), Stewart
patent: 4190859 (1980-02-01), Kinjo
patent: 4223187 (1980-09-01), Yonezawa et al.
patent: 4223347 (1980-09-01), Bouwhuis et al.
patent: 4238843 (1980-12-01), Carasso et al.
patent: 4296491 (1981-10-01), Jerome

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