国际ISO标准规定:光盘刻槽机和刻录机在连续刻划阿基米德螺线时制备的光盘槽距为1.6μi,允差为±0.1μm。因此用于计算机信息存储的数字光盘,其伺服跟踪用预刻槽的槽间距是1.6μm,允差为±0.1μm。预刻槽间是用来记录信息数据和预格式数据的,其轨迹间距只有0.8μm,为此必须保持刻槽轨迹和信息数据轨迹的均匀性,从而对录刻光斑功率提出了较高的要求。 The international ISO standard stipulates that the optical disk slot pitch and disc tolerance of the CD slotters and recorders when continuously scribing Archimedes’ spirals is 1.6μi and the tolerance is ± 0.1μm. Therefore, the digital optical disc used for storing computer information has a groove pitch of 1.6 μm for servo tracking pregrooves with a tolerance of ± 0.1 μm. The pregrooves are used to record information data and preformatted data with a trace pitch of only 0.8μm. For this reason, the track of the groove and the uniformity of the track of the information data must be kept, thereby putting a higher requirement on the power of the recorded light spot .