Key CAP classification; computers are evolving and progressing. Similarly, as a consumable, peripheral products and user relations are increasingly close. In particular, the keyboard has become the most frequent contact and the most commonly used input devices. Keyboard structure experienced mechanical, plastic film type, no contact electrostatic capacitance, conductive rubber-type development process, and keyboard characters on the printing method has made great progress and improvement. The so-called laser etching is the use of laser lettering technology in the key cap burning black grooves.