Patent ID: 8742273
Filing Date: 2014-06-03
Classification: G02B,H01H

Abstract:
1. 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 one of said key parts 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 the first surface so as to be in opposition to said circuit substrate, and said reflection member is arranged so as to cover the first surface in said end; and wherein at an inner side of said reflection member in said light guiding member, light scattering processing for reduction of light to reduce a light amount of light which transmits through the first surface from a vicinity of an edge portion of said reflection member is applied to 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 transmits through the first surface from the vicinity of the edge portion of said reflection member.