Patent ID: 8369368
Filing Date: 2013-02-05
Classification: G11B

Abstract:
1. A laser driving device comprising: a sample-hold section configured to sample and hold an electric signal based on laser light emitted from a laser element; a first pulse generating section configured to generate a reference pulse indicating one of changing timing in repetition of a space and a mark and timing of changing between said space and said mark by detecting an edge of a first transmission signal indicating, by said edge, information defining timing of obtaining said reference pulse; a second pulse generating section configured to generate a changing pulse indicating changing timing of divided power levels of respective light emission waveforms of said space and said mark and timing of a sampling pulse for sampling and holding said electric signal by detecting an edge of a second transmission signal indicating, by said edge, information defining timing of obtaining said changing pulse; a light emission waveform generating section configured to output reference level information as level information on a level at a position of said reference pulse, said level information being included in power level information on each power level of said light emission waveforms, for each said reference pulse, and output other level information following said reference level information in order for each said changing pulse; a storing section configured to store setting information defining a recording waveform control signal pattern indicating the power level information of said light emission waveforms for driving said laser element at the power levels of the respective light emission waveforms of said space and said mark and a pulse pattern of said sampling pulse; and a sampling pulse generating section configured to generate said sampling pulse on a basis of the setting information of said pulse pattern, the setting information being stored in said storing section, and supply said sampling pulse to said sample-hold section; wherein the reference level information as level information on the level at the position of said reference pulse, said level information being included in the power level information of the respective light emission waveforms of said space and said mark, is read out from said storing section for each said reference pulse, and then the other level information following said reference level information is read out from said storing section in order for each said changing pulse.