Patent ID: 8346034
Filing Date: 2013-01-01
Classification: G02B

Abstract:
1. An optical waveguide comprising: a light guide section which is disc-shaped with an outer circumferential area and configured to propagate and emit light made incident from each of a plurality of first positions located about the outer circumferential area of the disc-shaped light guide section from a plurality of second positions on the outer circumferential area of the disc-shaped light guide section; and a light reflection section with a first reflector parallel to, and facing, a second reflector, the first reflector and the second reflector being disposed parallel to and sandwiching the disc-shaped light guide section at opposing sides, and configured to reflect the light from each of the plurality of first positions into the disc-shaped light guide section, wherein the light reflection section includes an irregular reflection section with a rough surface area that is configured to irregularly reflect the light such that the light is emitted in a circumferential direction about the outer circumferential area of the disc-shaped light guide section.