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1. 发明申请

US20070286042A1 Adjustment method of optimum write power and optical write/retrieval device 有权
标题翻译：最佳写入功率和光学写入/取出装置的调整方法
公开(公告)号：US20070286042A1
公开(公告)日：2007-12-13
申请号：US11704352
申请日：2007-02-09
申请人： Soichiro Eto , Koichi Watanabe , Takahiro Karokawa
发明人： Soichiro Eto , Koichi Watanabe , Takahiro Karokawa
IPC分类号： G11B7/004
CPC分类号： G11B7/0062 , G11B7/1267
摘要： A write power adjustment method and optical read/write apparatus for accurate optimum write power setup. Different levels of write power Pwm are used to perform a test write and calculate a modulation Mm corresponding to each level of write power Pwm. Different write power compensated values Pcn are used to calculate an evaluated value Smn=Mm×(Pwm−Pcn). Pcn that maximizes the linearity of the relationship between compensated write power (Pwm−Pcn) and evaluated value Smn is determined as an optimum write power compensated value PcO. Compensated write power PthO that provides a modulation of zero, that is, an evaluated value SmO of zero, when the relationship between compensated write power (Pwm−PcO) for PcO and evaluated value SmO is subjected to linear approximation is determined. PthO and optimum write power compensated value PcO are used to calculate a write power threshold Pth=PthO+PcO. A predetermined calculation is performed on Pth to determine optimum write power Popt. In contrast to a conventional write power adjustment method (κ method), the present invention makes it possible to accurately adjust for the optimum write power even when the optical disc's write power Pwm-to-evaluated value M×Pw relationship is not linear or its modulation M varies.
摘要翻译：一种写入功率调整方法和光学读/写装置，用于精确的最佳写入功率设置。使用不同级别的写入功率Pwm进行测试写入，并计算与写入功率Pwm对应的调制Mm。不同的写功率补偿值Pcn用于计算评估值Smn = Mmx（Pwm-Pcn）。将补偿写入功率（Pwm-Pcn）与评估值Smn之间的关系的线性度最大化的Pcn被确定为最佳写入功率补偿值PcO。确定当PcO的补偿写入功率（Pwm-PcO）与评估值SmO之间的关系经受线性近似时，提供零调制的补偿写入功率PthO，即评估值SmO为零。 PthO和最佳写功率补偿值PcO用于计算写功率阈值Pth = PthO + PcO。在Pth上执行预定的计算以确定最佳写入功率Popt。与传统的写入功率调整方法（kappa方法）相比，本发明即使当光盘的写入功率Pwm至估计值MxPw关系不是线性或其调制M时也可以精确地调节最佳写入功率不一样

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