Controlling device of pickup in disc reproducing device
专利汇可以提供Controlling device of pickup in disc reproducing device专利检索，专利查询，专利分析的服务。并且PURPOSE:To prevent mechanical failure and to obtain a pickup controlling device with superior response to high frequency by controlling tracking and focus by an added output of a high frequency component of a difference signal and a low frequency component passed through a limiter. CONSTITUTION:Two pairs of spot light out of three irradiated to a disc surface are detected by photodiodes 51A, 52C respectively and a tracking difference signal is outputted from a differential error detecting circuit 53 and processed by a high pass loop filter (HPF) 62, a low pass loop filter (LPF) 63 and the limiter 64 respectively. An adder 65 outputs a tracking difference controlling servo signal. The focus control of an optical system is processed in the same manner. Said constitution prevents the pickup device from mechanism failure due to a low frequency difference with a high level and provides quick response also to the high frequency difference of the pickup controlling device in the disc reproducing device.，下面是Controlling device of pickup in disc reproducing device专利的具体信息内容。
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