基于CD/DVD光头的多层光存储系统

Multilayer optical storage system based on CD/DVD pick-up head

基于双光子吸收三维光存储技术和现有CD/DVD的高精度聚焦、循道伺服控制技术,搭建了一套与CD/DVD相兼容的信息存储系统.该系统通过DA输出选层信号控制音圈电机,实现多层读写.详细介绍了系统的工作原理.系统分为伺服和读写两个模块,伺服模块在跟踪光盘转动误差过程中提取光头的聚焦、循道伺服信号,同时为读写模块光头提供聚焦、循道激励信号.对双光头同步误差进行了测试,测试结果表明双光头激励信号具有一定的同步误差,基本符合系统正常运行时双光头同步误差的要求.

Based on the technology of two-photon three-dimensional optical storage and current CD/DVD＇s high precision control technology of focusing and tracking, an information storage system compatible with the current CD/DVD formats was set up. This system controls the voice coil motor by outputting the signal of selected layer with DA and realizes multilayer writing and readout. The working principle of the system was introduced. The system is divided into two modules： write-read module and servo module. The servo module picks up focusing and tracking signals of the pick-up head while following the rotating error of the disk, providing in the mean time the actuator signals of focusing and tracking. Testing of the dual pick-up heads＇ synchro error was performed and the results indicated that the dual pick-up heads have some synchro error, basically meeting the requirements of a normally functioning system for the synchro error of its dual pick-up heads.