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一、DVD激光头方式激光头是DVD机的关键部件。重放时,碟片上刻录的信号首先通过它利用激光拾取出来。它的性能直接关系到DVD机的质量。它的基本工作原理与VCD相同,但由于DVD碟片上刻录的信号坑纹比VCD的更细更密,一条信号坑纹的宽度和坑纹间的间距都只有VCD的一半,使单面单层的DVD碟片可播放135分钟,几乎是VCD的两倍,为650nm。目前,常见的激
First, the DVD laser head laser head is a DVD machine key components. During playback, the signal recorded on the disc is first picked up by the laser through it. Its performance is directly related to the quality of DVD player. Its basic working principle is the same as that of VCD. However, since the signal pit pattern recorded on a DVD disc is finer and denser than that of a VCD, the width of one signal pit pattern and the pitch between pit patterns are only half of the number of VCDs, Layers of DVD discs can play 135 minutes, almost double the VCD for 650nm. At present, the common shock