论文部分内容阅读
DVD影碟机自1995年以来产生了几次技术革命,从最初的第一代发展至今天的第三代,甚至出现了下一世纪的第四代。其间作为DVD最关键的器件——激光头,也经历了很大的变化,目前已形成由双光头向单光头发展的趋势。 为了能兼容CD/VCD,第一代DVD采用了双激光发生器。随着技术的发展和生产的扩大,双激光器技术的缺点逐渐暴露出来:成本高、驱动线圈多、故障率高、伺服系统设计困难,使得双激光器慢慢地退出了市场。第二代DVD中尚有部分应用双激光器,而进入第
DVD players have produced several technological revolutions since 1995, from the first generation to the third generation today, and even the fourth generation of the next century. In the meantime, as the key device of DVD, the laser head has also undergone great changes. At present, it has become a trend of development from double head to single head. In order to be compatible with CD / VCD, the first generation of DVD uses a dual laser generator. With the development of technology and the expansion of production, the disadvantages of dual laser technology are gradually exposed: the high cost, many driving coils, high failure rate and difficult servo system design make the dual laser slowly exit the market. The second generation DVD is still part of the application of dual lasers, and enter the first