Double-sided optical disc player

Details Double-sided optical disc player Double-sided optical disc player

1992-05-04

1993-10-12

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 50, 369 54, 369 4437, 369 32, G11B 700

Patent

active

052532429

ABSTRACT:
A double-sided optical disc player which comprises first and second optical heads for radiating laser beams to tracks on respective sides of a double-sided optical disc; first and second ID read-out units for reading respective sector addresses out from associated sector identifiers; an ID offset detecting unit for calculating, in response to outputs from the ID read-out unit, the ID offset value descriptive of an angular displacement in sector position between the opposite sides of the optical disc traced by the associated optical heads; an ID offset retaining unit for retaining the ID offset value; a first sector recording and/or production control unit for detecting a target sector when an sector address output from the first ID read-out unit coincide with the target sector and for activating a recording or reproduction of information; an adder for adding the ID offset value to an output from the second ID read-out unit; a second sector recording and/or reproduction control unit for detecting a target object when an corrected sector address outputted from the adder coincides with the target sector and for activating the recording or reproduction of the information; and an information recording and/or reproducing unit for recording or reproducing information on or from the target sectors on the respective sides of the optical disc by means of the first and second sector recording and/or reproduction control units.

REFERENCES:
patent: 4843494 (1989-06-01), Cronin et al.
Patent Abstracts of Japan vol. 13, No. 203(P-870) is May 1989 and JP-A-1023424.
Patent Abstracts of Japan vol. 14, No. 321(P-1074) Jul. 10, 1990 and JP-A-2103731.
Patent Abstracts of Japan vol. 14, No. 064(P-1002) Feb. 6, 1990 and JP A-1286 129.

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