Patent ID: 8545080

Claim:
A switch module which is arranged in opposition to a key substrate having key parts, comprising: a circuit substrate that has an electrode layer formed on a surface thereof in opposition to said key substrate; a light guiding member that is arranged between said key substrate and said circuit substrate; a light source element that emits light; and a reflection member that causes the light emitted from said light source element to enter an interior of said light guiding member from an end of said light guiding member; wherein by a movement of said key parts with respect to said electrode layer, an on and off of a switch is changed over, and at the same time, said key parts can be illuminated from the interior of said light guiding member by the light which has entered the interior of said light guiding member; wherein said light guiding member has a first surface that is arranged in opposition to said key substrate, and a second surface that is arranged at an opposite side of said first surface so as to be in opposition to said circuit substrate; and wherein in the vicinity of said end in the second surface, there is formed a print pattern by ink of a light absorbing property on an optical path of the light which has been caused to enter the interior of said light guiding member by means of said reflection member, and which, after being reflected on the second surface, transmits through the first surface in the vicinity of said end, without being reflected on the first surface.