THE ASSEMBLY OF KEY PRINTED-CIRCUIT BOARD OR KEY FLEXIBLE PRINTED-CIRCUIT BOARD THAT USE PLASTIC OPTICAL SHEET THAT IMPROVE LIGHT LEAKAGE PREVENTION

摘要

The invention waveguide sheet attached to a printed circuit board and can be used as a light source onto a tape dome on top relates to a process and method . ; the sheet of the waveguide is to place the LED in the light source to be used as a printed circuit board, the metal dome of the contact portion in contact with the electrical signal to the switch portion of the printed circuit board Raising , the light generated in the LED light is dispersed through the waveguide in the upper sheet metal dome sheet via a waveguide sheet , the process processing the metal dome switch portion waveguide sheet to pass over all of the light generated from the LED keypad, letter or is characterized by consisting of a structure that can recognize the number.