The electronic system and graphic display device

摘要

PROBLEM TO BE SOLVED: To provide an optical guiding unit which efficiently guides an optical signal of infrared light to a light receiving element integrally in a panel made of a light transmissive member.;SOLUTION: A light reception unit 100 formed integrally with the flat plate type light transmissive member is constituted such that when light is made incident from an incidence portion 16 on a front surface 10-1 of the panel, the light is reflected first to above the light reception unit 100 by an inclined plane 100-4 formed on the side of a back surface 10-2 of the panel. Then the light is repeatedly reflected by the front surface 100-1 and back surface 100-2 of the light reception unit 100 and a portion of the light reception unit 100 which is projected to the side of the back surface 10-2 of the panel and has an interface with air to reach a projection surface 100-3 as a top surface. Then light projected from the projection surface 100-3 is made incident on the light receiving element 200 opposed to the projection surface 100-3, so that the optical signal generated by a predetermined operation of a user is converted into an electric signal.;COPYRIGHT: (C)2007,JPO&INPIT