With the rapid update of 3C product appearance design and the continuous upgrading of material technology, automated measurement in the process of 3C product processing and manufacturing has become more and more used in recent years. Spectral confocal displacement sensor. The spectral confocal displacement sensor has exerted its unique advantages in many measurement applications such as mobile phone back shell, middle frame section difference, LOGO section difference, camera section difference, 2D/3D screen surface profile and so on. The Chinese automated measurement market defines a spectral confocal displacement sensor as a new type of sensor with high precision that can solve many difficult measurement applications.