Patent ID: 8335139
Filing Date: 2012-12-18
Classification: G11B

Abstract:
1. A control device comprising: a recording portion that records data on a disk by shining a laser beam onto a recording surface of the disk; a reading portion that reads the data that the recording portion has recorded on the disk; a control parameter computation portion that computes a control parameter based on a signal that is generated by the reading of the data by the reading portion; a differential computation portion that computes a differential between the control parameter that the control parameter computation portion has computed and a value that is set in advance for the disk; a determination portion that determines whether the differential that the differential computation portion has computed is within a range of a dead band; an output value computation portion that, in a case where the result of the determination by the determination portion is that the differential is not within the range of the dead band, computes, using a gain that is associated with the dead band, an output value for the laser beam that the recording portion will shine next onto the recording surface of the disk; an output control portion that, based on the laser beam output value that the output value computation portion has computed, controls the laser beam that the recording portion will shine next onto the recording surface of the disk; a storage portion that stores a plurality of combinations of the dead band and the gain; and a selecting portion that selects, from among the plurality of the combinations of the dead band and the gain, one of the combinations of the dead band and the gain that the determination portion and the output value computation portion will use.