Double-sided optical disc player.

摘要

A double-sided optical disc player operable with a double-sided optical disc (1), which comprises: first and second optical heads (4A, 4B) for irradiating laser beams to tracks on opposite sides (3A, 3B) of the double-sided optical disc (1); first and second servo means (6A, 6B) for focusing and tracking the laser beams towards predetermined tracks on the opposite sides of the optical disc; at least one retrieval means for sending the first and second optical heads towards the predetermined tracks; first and second ID read-out means (10A, 10B) for reading out respective sector addresses from associated sector identifiers (ID) on the respective opposite sides of the optical disc; a first sector recording and/or production control means (11A) for detecting a target sector when an sector address output from the first ID read-out means (10A) coincides with the target sector on one of the sides of the optical disc and for activating a recording or reproduction of information; a second sector recording and/or reproduction control means (11B) for detecting a target sector on the other of the sides of the optical disc and for activating a recording or reproduction of the information; and, an information recording and/or reproducing means (12A, 12B) 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 means. The disc player also includes an ID offset detecting means (21) for calculating, in response to outputs from the ID read-out means, an ID offset value (17) descriptive of an annular displacement in sector position between the opposite sides (3A, 3B) of the optical disc traced by the associated optical heads (4A, 4B); an ID offset retaining means (17) for retaining the ID offset value (18); an adder means for adding the ID offset value to an output from the second ID read-out means; and the second sector recording and/or reproduction control means (11B) detecting a target sector when a corrected sector address output from the adder means coincides with the target sector on the other of the sides of the optical disc. <IMAGE>