Patent ID: 8084758

Claim:
A light sensor for detecting brightness of an outside of a vehicle comprising: a light shielding element mounted on an inner surface of a windshield of the vehicle, wherein the light shielding element includes a through hole; a light guiding element disposed in the through hole of the light shielding element; and a light receiving element that receives light from the outside of the vehicle via the light guiding element and the windshield, wherein the light receiving element outputs a signal corresponding to an amount of the light, wherein the light guiding element includes an entrance surface facing the windshield and an output surface facing the light receiving element, wherein the entrance surface of the light guiding element receives the light from the outside of the vehicle via the windshield, wherein the light guiding element transmits the light therein and outputs the light from the output surface of the light guiding element toward the light receiving element, wherein the entrance surface has a top, which is disposed inside of the through hole, wherein the entrance surface of the light guiding element has a normal line, which is in parallel to a horizontal direction of the vehicle, and wherein the entrance surface of the light guiding element is flat.