G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/00 (2006.01) G11B 7/0045 (2006.01) G11B 20/14 (2006.01)
Patent
CA 1181172
ABSTRACT: An apparatus for recording optically detectable information in a record carrier 1 provided with information areas 9 arranged in accordance with a spiral or concentric track pattern, which areas 9 alternate with synchronization areas 8 in each of which the address of the associated information area is recorded in an optically detectable manner. Recording is effected with the aid of first modula- ted laser beam 16a, whilst a second beam 16b is projected after the first beam for reading the recording The track pattern has previously been provided with a periodic track modulation of a frequency at which the power spectrum of the information to be recorded substantially exhibits a zero point. The apparatus comprises a first and a second filter for filtering a signal corresponding to the track modulation out of the first or second laser beam reflected or transmitted by the record carrier, whilst in series with the second filter there is included a delay network 51, from which a synchronization signal is available. Further- moro, there is provided a phase comparator 52 which during reading of the synchronization areas determines the phase difference between the signals obtained by means of the first and the second filter and which controls the delay network 51 in such a way that the output signal of said delay network is in phase with the output signal of the first filter. Figs. 1 and 13.
368012
Carasso Marino G.
de Haen Maarten R.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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