会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 8. 发明专利
    • DE69021784D1
    • 1995-09-28
    • DE69021784
    • 1990-06-11
    • CANON KK
    • OGINO YASUO
    • G11B21/10G11B7/09
    • An optical information recording-reproducing apparatus comprises scanning device for scanning a recording medium by a light beam and effecting the recording and/or reproduction of information, controller for effecting the auto focusing control and/or the auto tracking control of the light beam, an error signal detecting circuit for detecting an error signal for driving the controller, a plurality of sample hold circuits (2, 3) for periodically sampling the error signal at different timings, an abnormality detecting circuit (4) for detecting the abnormality of the behavior of the error signal, a circuit (5) for discontinuing the sampling when the sampling starting time of the sample hold circuits has come within a period during which the abnormality is being detected by the abnormality detecting circuit, a selecting circuit (6) for selecting one of the plurality of sample hold circuits and supplying the output of the selected circuit to the control means, and an instructing circuit (5) for instructing the selecting circuit to select other sample hold circuit when abnormality is detected by the abnormality detecting circuit during the sampling period of the selected sample hold circuit.