Patent ID: 7701826

Claim:
An optical disk drive comprising: a laser light source that emits a laser beam to access an information storage medium optically; a driver for supplying drive current to the laser light source; an RF circuit for adding RF superimposed current to the drive current; a temperature sensor for detecting a temperature around the laser light source; and a control section for switching the values of the RF superimposed current according to the temperature detected, wherein under a condition where the values of the RF superimposed current is at a first level I 1 , the control section increases the values of the RF superimposed current from the first level I 1 into a second level I 2 when the temperature detected by the temperature sensor reaches a temperature T 1 from a temperature that is lower than the temperature T 1 , and under a condition where the values of the RF superimposed current is at the second level I 2 , the control section decreases the values of the RF superimposed current from the second level I 2 into the first level I 1 when the temperature detected by the temperature sensor decreases to a temperature T 2 that is lower than the temperature T 1 .