Optical disc access control system that counts tracks using trac

Details Optical disc access control system that counts tracks using trac Optical disc access control system that counts tracks using trac

1988-03-18

1991-06-11

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 44370, G11B 700

Patent

active

050238558

ABSTRACT:
An apparatus for counting a number of record tracks which an optical head traverses on a basis of a periodical track transverse information INF.sub.TR representing the traverse of the head across the record tracks. The periodical track transverse information INF.sub.TR is derived by sampling information on the record tracks performed discretely on record tracks TR. In the tracks counting apparatus, a tracking signal generating circuit is installed for generating tracking signals V.sub.OP and V.sub.OQ which vary their frequencies and phases so as to follow those of the track transverse information INF.sub.TR. The number of record tracks which the optical head has traversed are counted on the basis of the tracking signals V.sub.OP and V.sub.OQ. The tracking signals V.sub.OP and V.sub.OQ have continuous waveforms so that the number of tracks can accurately be counted even if the only discrete information is derived as the track transverse information INF.sub.TR.

REFERENCES:
patent: Re32937 (1989-05-01), Silvy et al.
patent: 4541083 (1985-09-01), Maeda et al.
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4740940 (1988-04-01), Tanaka et al.
patent: 4805050 (1989-02-01), Aoyagi et al.
patent: 4809251 (1989-02-01), Collomby et al.

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