Optical information reproducing device
专利汇可以提供Optical information reproducing device专利检索，专利查询，专利分析的服务。并且PURPOSE: To always accurately binarize a regenerative signal by projecting a subread beam prior to a main read beam on the same track, setting a threshold value for the regenerative signal by the main read beam based on the regenerative signal by this subread beam and binarizing the regenerative signal by the main read beam.
CONSTITUTION: A hold signal 42 is obtained by holding a peak value of the regenerative signal 41 in a peak detector 34 from a subreader 32, and a threshold signal 44 is obtained by adjusting a gain and offset in a limiter 35 to convert a level to make this hold signal an optimum threshold value for the regenerative signal 43 by the main read beam from a main reader 31. Then, this threshold signal 44 and the regenerative signal 43 by the main read beam from the main reader 31 are compared with each other by a voltage comparator 33, so that a binarized signal 45 corresponding to a bit of '1' having optical information is obtained. By this method, the regenerative signal can always accurately be binarized even when a regenerative signal level has a factor of its fluctuation at individual points of a recording medium.
COPYRIGHT: (C)1991,JPO&Japio，下面是Optical information reproducing device专利的具体信息内容。
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