A semiconductor laser drive device is adopted in an optical disk read/write unit for writing/reading data in/from an optical disk. The device has driver for modulating the laser beam of the intensity corresponding to a drive current value in accordance with write data WDATA, photodiode for detecting...http://www.google.fr/patents/US4747091?utm_source=gb-gplus-shareBrevet US4747091 - Semiconductor laser drive device
