Patent ID: 6421314
Filing Date: 2002-07-16
Classification: G11B

Abstract:
A semiconductor laser drive device to drive a semiconductor laser for an optical disk device which records and reads information by irradiating a laser light from the semiconductor laser on an optical recording medium comprising:a laser drive for supplying to the semiconductor laser a drive signal responsive to an operation mode of the optical disk device; a high-frequency superimposing means for superimposing a high frequency signal on the drive signal; and a superimposed high-frequency signal changing means for changing a frequency and an amplitude of the high frequency signal responsive to said operation mode of the optical disk device; the superimposed high-frequency signal changing means changing the frequency and amplitude of the high-frequency signal into a first frequency and a first amplitude when the optical disk device is in an information record operation mode, and a second frequency lower than the first frequency and a second amplitude greater than the first amplitude when in an information read operation mode.