Optical information recording and reproducing appa

专利名称：Optical information recording and

reproducing apparatus

发明人：Shikichi, Satoshi,Hosoya, Hideki申请号：EP87304349.1申请日：19870515公开号：EP0246830B1公开日：19920805

摘要：The apparatus for an optical information record medium (101) on which aplurality of tracks are arranged substantially in parallel, comprises a light source (107), afirst optical system (108-110) for guiding a light beam from the light source, onto therecord medium, a second optical system (110,109,109,113,114) for obtaining the lightbeam from the record medium, a detecting device (115,116) for receiving the light beamobtained by the second optical system to output at least one of a focusing signal and atracking signal, and adjusting device (121,122,111, 112) for adjusting at least one offocusing and tracking operation in accordance with at least one of the focusing andtracking signals, a reciprocating device (125) for causing the record medium toreciprocate, a control device (123,125) for controlling the reciprocating device, and achange device (126,121-2,C,D,122-2,A,B) for changing at least a servo gain of the adjustingdevice in accordance with at least a signal from the control device.

申请人：CANON KABUSHIKI KAISHA

地址：30-2, 3-CHOME, SHIMOMARUKO, OHTA-KU; TOKYO

代理机构：Beresford, Keith Denis Lewis

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