Patent ID: 7901108

Claim:
An LED light source device, comprising: luminescent elements and a translucent light-guiding member, wherein the translucent light-guiding member has a central convex lens with a first cylindrical light-guiding part formed on an outer peripheral surface of the central convex lens, and a second cylindrical light-guiding part formed on an outer peripheral surface of the first cylindrical light-guiding part, wherein an air layer is formed between the outer peripheral surface of the first cylindrical light-guiding part and an inner peripheral surface of the second cylindrical light-guiding part, wherein the outer peripheral surface of the first cylindrical light-guiding part and the outer peripheral surface of the second cylindrical light-guiding part are rotated quadratic surfaces, each with the same focal point, and wherein each of the rotated quadratic surfaces is positioned to receive light emitted from the luminescent element and to cause said light to travel along an optical axis of the translucent light-guiding member and be reflected in a light radiation direction.