Patent ID: 8177409
Filing Date: 2012-05-15
Classification: G02B,H01H

Abstract:
1. A light guide sheet comprising: a silicone rubber sheet; and plural printed mark parts printed on a front surface of the silicone rubber sheet, wherein the silicone rubber sheet has a visible light transmittance of 80 to 99%, the silicone rubber sheet has a light incidence portion that allows light to be incident upon an interior of the silicone rubber sheet at an end face thereof, the light incident upon the interior of the silicone rubber sheet from the light incidence portion is diffused by the printed mark parts, and passes through the printed mark parts, thereby being guided from the printed mark parts to outside, the silicone rubber sheet is obtained by heat-curing heat-curable liquid rubber, the printed mark parts contain a base material and light-diffusing particles dispersed in the base material, the base material being obtained by heat-curing heat-curable liquid silicone rubber, the base material having a refractive index similar to that of the silicone rubber sheet.