Laser diode driver and driving method for controlling auto laser power, optical pickup device, and optical recording/reproducing apparatus using the same
View Patent ↗A laser diode driver, and driving method, for driving a laser diode in an optical recording/reproducing apparatus, having an auto laser power control (APC) operation, an optical pickup device, and an optical recording/reproducing apparatus, and method therefore, using the laser diode driver. The laser diode driver includes a multiplexer, a pulse generator, a differential amplifier, and an adder. The multiplexer selectively outputs drive potentials, such as a peak power drive potential, a bias power drive potential, a read power drive potential, and the like, corresponding to power levels of a laser signal, in response to a select signal applied to the multiflexer. The pulse generator generates the select signal applied to the multiplexer, the differential amplifier calculates a difference between a monitor signal provided from a monitor diode for monitoring the laser signal output from the laser diode and a drive potential selected by the multiplexer, the adder adds an output of the differential amplifier and an output of the multiplexer and outputs a signal for driving the laser diode, and the laser diode driver itself performs the APC function, thereby reducing the potential of laser diode driver malfunction caused by electromagnetic interference.
1. An optical recording/reproducing apparatus, comprising:
an optical pickup comprising a laser diode to generate a laser signal recording/reproducing data on/from a data storage medium and which can move across the data storage medium, a monitor to detect an output of the laser diode, and a first printed circuit board including a laser diode driver, with the first printed circuit performing an automatic power control operation by controlling a power level of the laser diode according to changes in temperature of the laser diode, as detected by the monitor and output to the laser diode driver;
a second printed circuit board, separate from the first printed circuit board, including a controller for controlling the laser diode driver; and
a flexible printed circuit board to interface signals between the first and second printed circuit boards.