Patent ID: 8143541

Claim:
A movable contact assembly comprising: a light guiding sheet which is light transmittable, the light guiding sheet including a first portion and a second portion, the second portion of the light guiding sheet having a light inlet having a plurality of grooves provided therein, wherein the light inlet is arranged to introduce light into the light guiding sheet through surfaces of the plurality of grooves from an outside of the light guiding sheet; and a movable contact provided on the first portion of the light guiding sheet, wherein the light guiding sheet has two surfaces opposite to each other and a side edge surface which is connected to the two surfaces of the light guiding sheet, the side edge surface entirely surrounding an outer periphery of each of the two surfaces of the light guiding sheet, the movable contact is provided on one of the two surfaces of the light guiding sheet, and the light inlet is provided on one of the two surfaces of the light guiding sheet.