Patent ID: 7764588
Filing Date: 2010-07-27
Classification: G11B

Abstract:
1. An optical disc apparatus comprising: a power adjusting means to adjust a DC current supplied to a laser so that a light emitting power of the laser will be at a predetermined value; a high frequency current source to supply a high frequency current to the laser; and a laser control means; wherein, when data is played back from an optical disc, the laser control means supplies to the laser the high frequency current from the high frequency current source to cause the laser to repetitively alternate light emission and extinction and also supplies to the laser, in combination with the high frequency current, the DC current from the power adjusting means to stabilize the light emitting laser power at a predetermined value; wherein, when data is not played back from the optical disc, the laser control means stops the current supply from the high frequency current source, causes the laser to emit light with the DC current supplied from the power adjusting means, and adjusts the current supply to the laser by the power adjusting means so that the light emitting laser power will be at the predetermined value; wherein a switch from a state in which the high frequency current source stops supplying current to a state in which the high frequency current source supplies current is done by progressively increasing an amplitude of the high frequency current generated by the high frequency current source.