主权项 |
1. A sterilization device, comprising:
a housing having a flow passage of a fluid that is to be sterilized; and a light source being disposed in the housing to irradiate ultraviolet light into the flow passage, wherein an inner wall surface of the flow passage has a pair of reflection surfaces which direct the ultraviolet light irradiated from the light source from one side of the flow passage to another side thereof while reflecting the ultraviolet light a plurality of times; and a return surface that is composed of a surface that is perpendicular to an optical axis of the light which has been reflected a plurality of times from the one side to the other side, and returns the light toward its original direction is formed on a side of one of the pair of reflection surfaces. |