| 摘要 |
Summary Subject It is a subject to provide an optical disc device which can speedily control generation of a data sync clock, when the position of data reading by an optical pickup shifts between a data unrecorded area and a data recorded area. Solution Means An optical disc device comprises a first wobble cycle counter 702 for counting the cycle of a wobble reference signal S104 that is synchronized with a wobble signal S101 obtained from an optical disc, with a constant cycle clock S102; a second wobble cycle counter 703 for counting the cycle of the wobble reference signal S104 with a data sync clock S103; a count value comparator 704 for obtaining a difference between a count value outputted from the first wobble cycle counter 702 and a count value outputted from the second wobble cycle counter 703; and a comparison result judgement unit 710 for judging whether or not the value of a count value comparison result that is output from the count value comparator 704 is within a range of preset values. Therefore, when a position where information is read by an optical pickup shifts between a data unrecorded area and a data recorded data, generation of the data sync clock can be speedily controlled.
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