KEY SHEET, LIGHT SHIELDING LIGHT GUIDE SHEET, PUSH BUTTON SWITCH, AND PROCESS OF MANUFACTURING KEY SHEET

摘要

PROBLEM TO BE SOLVED: To provide a technique of efficiently guiding light inside a key sheet and preventing light leak from the periphery of a key top.SOLUTION: A key sheet 31 is formed by providing a transparent resin layer 33 composed of a cured body of a coating liquid that is non-erosive to a base sheet 3 and a light shielding dark color printed layer 24 on the surface thereof on at least one side of surfaces of the base sheet 3, and forming a smooth surface 11 between the base sheet 3 and the dark color printed layer 24. It is possible to make light transmitted to the base sheet 3 difficult to enter the dark color printed layer 24, make light easy to be guided in the base sheet 3, and shield light transmitting the base sheet 3.