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发明公开
EP0984440A3 Aberration detection device and optical information recording and reproducing apparatus 审中-公开
像差检测装置和光学信息记录和再现装置

Aberration detection device and optical information recording and reproducing apparatus
摘要：
A returning light beam emitted by a light source (101) and reflected by an optical disk (106) is separated by a half mirror (102), and partitioned and deflected at a hologram (109) into a light beam passing a first region and a light beam passing a second region. The light beam passing the first region is received by a plurality of photo-detectors (107), and the aberration is detected by comparing the resulting signals. Based on the aberration detection, the aberration of an optical system can be reduced by driving an aberration correction element (104) in real-time.
摘要（中）：

由光源（101）发射并被光盘（106）反射的返回光束被半反射镜（102）分离，并且在全息图（109）处被分隔和偏转成通过第一区域的光束，并且 光束通过第二区域。 通过第一区域的光束被多个光电检测器（107）接收，并且通过比较得到的信号来检测像差。 基于像差检测，通过实时驱动像差校正元件（104）可以减小光学系统的像差。

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