DVD光学头误差探测器性能参数检测与评价

Test and Evaluation of Characteristic Parameters in Error Detectors of DVD Pickup

DVD光学头误差探测器的性能参数对其伺服精度和读出信号均有重要的影响 ,本文介绍了误差探测器的结构及信号检测原理 ,重点探讨了离焦误差探测器和道跟踪误差探测器的安装精度对光学头在 DVD模式和 CD模式下聚焦和寻迹伺服性能的影响 ,同时给出了具体的性能参数评价公式 。

The property parameters of error detectors of DVD optical pickup have important influence on its servo precision and readout signal. This paper introduces usual structure and signal detecting principle of error detectors, mainly analyses the effect of assembling accuracy of focusing and tracking error detector on the servo properties under DVD and CD modes. In the meantime, this paper presents concrete evaluation formula of property parameters, discusses the measures to check and evaluate the property parameters of error detectors according to actual experimental results, and draws some conclusions useful to actual production and application of DVD optical pickup.