KEY SHEET, LIGHT GUIDE SHEET HAVING LIGHT-BLOCKING EFFECT, PUSH-BUTTON SWITCH, AND METHOD FOR MANUFACTURING KEY SHEET

摘要

The present invention provides technology that can efficiently guide light to the interior of a key sheet and prevents light from leaking from the circumferences of key tops. A key sheet (1) has a light-shielding dark print layer (24), on the rear surface (3b) of a base sheet (3), that is a cured body of a coating liquid that is not dissolve to the surface of the base sheet (3), and also has a smooth surface (11) between the base sheet (3) and the dark print layer (24). The invention can make light transmitting in the base sheet (3) hard to enter the dark print layer (24) so that the light can be efficiently guided in the base sheet (3), and also can prevent light from transmitting through the base sheet (3) by blocking the light.