Patent ID: 7802899

Claim:
A rod-shaped light guide comprising: a rod-shaped light guide body having a longitudinal axis, at least one end face orthogonal to said longitudinal axis and a plurality of peripheral side surfaces extending in a direction of said longitudinal axis; said at least one end face comprising an end face to which light is incident; a scattering pattern formation plane extending in a direction of said longitudinal axis and being operative to scatter light incident to the end face; and a light emitting portion extending in a direction of said longitudinal axis and being located opposite to the scattering pattern formation plane for emitting light outside the guide, wherein the light emitting portion comprises a plurality of said peripheral side surfaces formed as planes and comprising at least a first plane and a second plane connected to each other and a cross section of said light guide body perpendicular to the longitudinal axis is asymmetrical, the light emitting portion is formed such that an area of said first plane is smaller than said second plane, and the light emitting portion is formed such that an interior angle formed by the first plane and the second plane is between 90° and 120°.