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1. 发明授权

EP1769499B1 FOCUS CONTROL IN A MULTIPLE-BEAM DISC DRIVE 有权
标题翻译：在多光束光盘驱动器中的聚焦控制
公开(公告)号：EP1769499B1
公开(公告)日：2008-09-03
申请号：EP05759910.2
申请日：2005-07-11
申请人： Koninklijke Philips Electronics N.V.
发明人： TUKKER, Teunis Willem , LIEDENBAUM, Coen T. H. F. , VAN DER LEE, Alexander M.
IPC分类号： G11B7/09 , G11B7/14 , G11B7/13
CPC分类号： G11B7/131 , G11B7/0917 , G11B7/0943 , G11B7/14
摘要： A method for controlling an optical disc drive apparatus (1) which comprises: light beam generating means (31) for generating a plurality of N optical beams (32(i)); means (33, 34, 37) for focussing said beams in respective focus spots (F(i)); at least one adjustable member (34) for axially displacing said focus spots; comprises the step of calculating an optimum setting (ZOPTIMUM) for the adjustable member (34), such that the out-of-focus condition for the optical system (30) as a whole is as small as possible. The position of the adjustable member (34) may be controlled to be substantially equal to the said optimum setting (ZOPTIMUM). Or, one specific beam is maintained in a focus condition, the beam having number m=mOPT selected according to mOPT =± INTEGERSQUARE{(N-1)/(2√2)} in case N is odd or mOPT = ± INTEGERROUND IN-(N-2)/8) in case N is even.
摘要翻译：一种用于控制光盘驱动装置的方法，该装置包括：产生多个N光束（32（i））的光束产生装置（31）用于将所述光束聚焦在各个聚焦点（F（i））中的装置（33,34,37）; 至少一个可调节构件（34），用于轴向移动所述聚焦点; 包括计算用于可调节构件（34）的最佳设置（ZOPTIMUM）的步骤，使得整个光学系统（30）的离焦条件尽可能小。可调节构件（34）的位置可以被控制为基本上等于所述最佳设置（ZOPTIMUM）。或者，在聚焦条件下维持一个特定波束，在N为奇数或mOPT =±INTEGERROUND IN的情况下，根据mOPT =±INTEGERSQUARE {（N-1）/（2√2）}选择数目为m = mOPT的波束 - （N-2）/ 8）。

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