| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide in which generation of positional deviation of reflectors and a gap between the reflectors are suppressed, and which has expected optical characteristics.SOLUTION: A light guide has: a cylindrical frame body with an approximately polygonal inner peripheral shape on a cross-section; and reflectors fixed to the respective inner planes to be sides of an inner periphery on the cross-section on the inner peripheral plane of the frame body, in which a polygonal cylindrical reflection plane is formed by the reflection planes of the reflectors fixed to the respective inner peripheral planes. An accommodation recess extending in a cylinder axis direction of the frame body, which accommodates tip side edges of the reflectors to be fixed to the inner peripheral planes is formed at a tip side in one peripheral direction of the respective inner peripheral planes in the frame body. Each of the reflectors is fixed in a state in which the tip side edges enter the accommodation recess of the frame body, and at least the side on a reflection plane side on a rear end side end face of the reflector is in contact with the reflection plane of a subsequent reflector in the one peripheral direction. |
