溅镀后的模压盘片能够在播放器上读出,为确保读出信号的强度,需要溅镀金属层的反射率达到80％。从注塑机取出的透明盘片不能在播放机上播放,因为播放机的读出激光无法反射并返回读出探测器。为了能够播放,入射激光中的70％必须要返回探测器。这意味着透明盘片上需有一反射层,反射率至少为80％。因为大约10％的光在盘片和空气的界面上由于随机散射和损失而消耗掉。反射层的制作工艺称为金属化。有两种主要技术:蒸发和溅射,都要求在真空室内进行。蒸发是最早用于CD盘金属化的工艺。一批盘片放在一个架子上,然后装入一个大真空室中。抽气使室内压力降低,熔化的铝几乎沸腾,沉积在盘片的坑点表面形成铝层。沉积后,使室内压力升到大气压,取出盘片。只要非常薄(55～ Sputtered platters can be read on the player. To ensure readout signal strength, the reflectivity of the sputtered metal layer needs to be 80%. Transparent discs removed from the injection molding machine can not be played on the player because the player’s readout laser can not reflect and return to the readout detector. To be able to play, 70% of the incident laser must be returned to the detector. This means that a transparent layer needs to have a reflective layer with a reflectivity of at least 80%. Because about 10% of the light is consumed at the disk-air interface due to random scattering and loss. The manufacturing process of the reflector is called metallization. There are two main technologies: evaporation and sputtering, all within the vacuum chamber. Evaporation is the earliest process for the metalization of CD disks. A batch of platters is placed on a shelf and loaded into a large vacuum chamber. Suction to reduce the pressure inside the room, the molten aluminum almost boiled, deposited on the surface of the pits to form aluminum layer. After deposition, the pressure in the chamber was raised to atmospheric pressure to remove the disk. As long as very thin (55 ~