Optical information reading apparatus

专利名称：Optical information reading apparatus发明人：Suzuki, Toshio, c/o Pioneer Electronic

Co.,Nishitsuka, Mitsuru, c/o PioneerElectronic Co.

申请号：EP90310774.6申请日：19901002公开号：EP0453681B1公开日：19951213

摘要：In the tracking control unit (T, 2, 15, 16, 61) of an optical information readingapparatus to perform \"Heterodyne Method\quadrant-separated subdetectors (14) are inputted to a first adder (A₁, 15) to obtain areference sum total signal whose phase is 0°. Regarding phase difference, the sum totalsignal is compared with a first electric signal from an arbitrary one of the quadrant-separated subdetectors and a second electric signal from the other of the subdetectorslocated in the diagonal relationship with respect to the arbitrary subdetector,respectively, to produce a first and a second phase compared result signals which areadded to each other by a second adder (A₂, 27) whereby a precise tracking control can beattained irrespective of the existence of any scratch or stain.

申请人：PIONEER ELECTRONIC CORP

地址：JP

国籍：JP

代理机构：Jackson, Peter Arthur

更多信息请下载全文后查看