Apparatus for detecting positional deviation of a

专利名称：Apparatus for detecting positional deviation

of a moving stage in a two- stage opticalrecording/producing apparatus

发明人：Hitoshi Imai申请号：US07/690682申请日：19910424公开号：US05199012A公开日：19930330

摘要：The optical recording/reproducing apparatus provided with a dividing opticalelement which divides a part of the light from a light source and projects the divided lightto a moving stage on which an objective lens is mounted, a reflecting optical elementwhich is mounted on the moving stage and reflects the projected light from the dividingoptical element, and a photodetector which detects the reflected light from thereflecting optical element, wherein the deviation amount of the moving stage from areference position is detected on the basis of output of the photodetector. Since thecondition when the reflected light is incident upon the photodetector is changed inconsequence to the positional deviation of the reflecting optical element as the movingstage is moved, the deviation amount of the moving stage is detected on the basis of theoutput of the photodetector. The deviation amount of the moving stage can be detectedat all times, thereby achieving good tracking control.

申请人：MITSUBISHI DENKI KABUSHIKI KAISHA

代理机构：Wolf, Greenfield & Sacks

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