Patent ID: 7773477
Filing Date: 2010-08-10
Classification: G11B

Abstract:
1. An optical disk driving unit comprising: a pickup configured to supply a drive current to a laser unit, and to irradiate a laser beam to an optical disk; a plurality of first signal lines configured to transmit a plurality of current setting signals for setting current value of the drive current to the pickup; a plurality of second signal lines configured to transmit a plurality of waveform control signals for controlling waveform of the drive current to the pickup; and a pickup controller configured to transfer, to the pickup via the second signal lines, control data for controlling function of the pickup instead of the waveform control signals when the drive current is a constant value; wherein the pickup controller supplies a plurality of current setting signals and a plurality of waveform control signals to generate the drive current as the control information to the pickup in a recording mode, said pickup controller comprising, a signal generator configured to generate first and second current setting signals as the current setting signals, and to generate a first waveform control signal and a second waveform control signal for masking the first waveform control signal as the waveform control signals, a control data generator configured to generate the control data, a data transfer clock, and an output enable signal to indicate generation of the drive current and a select signal generator configured to select one of the first waveform control signal and the control data as a first select signal, and to select one of the second waveform control signal and the data transfer clock as a second select signal.