Patent ID: 7722238

Claim:
A light source device comprising: a light source; a light-guiding member having an exit surface; wherein a reference plane is substantially parallel to the exit surface of the light-guiding member; and wherein the light-guiding member receives light from the light source and emits light in a first direction, which forms a first angle with respect to the reference plane, wherein the first direction is different from a direction in which light is emitted from the light source; and an optical member which receives light emitted from the light-guiding member and emits light in a second directions which forms a second angle, different from the first angle, with respect to the reference plane; wherein the light source is disposed along a light-incident surface of the light-guiding member; wherein the optical member comprises: a flat plate composed of a transparent material; and a plurality of circular cones composed of a transparent material and formed on a surface of the flat plate that faces the light-guiding member, the circular cones totally reflecting light that has been emitted from the light-guiding member, entered the circular cones with refracting, and reached side surfaces of the circular cones, and the circular cones emitting light; and wherein light that has been transmitted through the circular cones has a directivity that is increased in two perpendicular directions in the reference plane.