Patent ID: 7095764

Claim:
A laser driving method for driving a laser, said laser driving method comprising the step of: adjusting an initial value of a driving current for driving said laser when an operation mode is changed on a basis of a difference in magnitude between a first bias current comprising information on threshold current of said laser in a first operation mode and a second bias current comprising information on said threshold current in a second operation mode, and performing pulse driving of said laser by generating a combined current by superimposing a current pulse for generating a light emission waveform of multilevel power on bias current comprising information on the threshold current of said laser, and supplying the combined current to said laser, wherein said first operation mode is a reproduction mode, and said first bias current is the driving current in said reproduction mode, and said second operation mode is a recording mode, and said second bias current is a current on which said current pulse is superimposed in the driving current in said recording mode.