Patent ID: 7065012

Claim:
An optical storage device for writing and/or reading data to/from a storage medium using a laser beam, comprising: a light source for emitting the laser beam onto said storage medium; a servo controller for performing follow-up control of said laser beam on said storage medium according to the reflected light of said storage medium; a light source driver for applying drive current to said light source for said writing and/or reading; a signal generator for generating high frequency signals to be superimposed onto said drive current; and a controller for judging whether the laser emission of said light source is unstable from the servo control status by said servo controller, and superimposing said high frequency signals onto said drive current when judging that the laser emission is unstable, and wherein the controller cancels superimposing of said high frequency signals onto said drive current when judging that the laser emission is stable from the servo control status by the servo controller.