Patent ID: 6798728
Filing Date: 2004-09-28
Classification: G11B

Abstract:
An optical disk device comprising a semiconductor laser, a current generator for supplying a D.C. or pulse-shaped drive current to said semiconductor laser, a power detector for detecting the luminescent power of said semiconductor laser, a peak detector for detecting the peak level of the output signal of said power detector, a bottom detector for detecting the bottom level of the output signal of said power detector, an arithmetic and control unit having programs for computing the drive current of said semiconductor laser and controlling the drive current of said current generator according to the result of computation, and a thermal detector for detecting the temperature of said semiconductor laser, wherein said arithmetic and control unit has a plurality of current computing programs for computing the drive current of said semiconductor laser by different methods and a program for selecting one current computing program, out of said plurality of current computing programs, according to a temperature signal supplied by said thermal detector.