| 摘要 |
An optical deflector element has a light incoming surface ( 41 ) in which light enters and a light outgoing surface ( 42 ) located opposite the light incoming surface and from which light exits. In the light incoming surface ( 41 ) are arranged elongated prisms ( 41 A) in parallel to each other. Each of the elongated prisms ( 41 A) is formed by a top end flat face ( 46 ) located at the top end of the elongated prism and having an inclination angle (b) of 1 to 50 degrees, a first prism face ( 44 ) located at one side of the flat face, and a second prism face ( 45 ) at the other side. A light source device is formed by combining the optical deflector element, light guide and a primary light source. The light guide has a light incident face in which light emitted from the primary light source enters, and a light emitting face from which guided light exits. The combination above provides a light source device that does not have degradation in luminance and has excellent quality free from visual defects including a black stripe and a Moire pattern.
|
