| 摘要 |
In the production of a waveguide, a pipe (1) of a glass which is soluble in an acid or an alkali is used in order to obtain a smooth inner peripheral surface of a reflecting layer (2, 2C) of the waveguide. After the reflecting layer is formed on the outer periphery of the pipe, the glass pipe is dipped in an etchant to be dissolved and removed. A reinforcement layer (3) can be applied to the waveguide, and the reinforcement layer is made of a resin in order to keep the flexibility of the waveguide. In this case, the reinforcement layer of a resin is formed on the outer periphery of the reflecting layer (2) on the pipe (1), and thereafter the pipe is dipped in the etchant and is removed. The waveguide of a circular cross-section can be flatted. In this case, the reinforcement layer (3) made of a thermoplastic resin is heated to be softened, and then a compressive force is applied to the waveguide radially thereof to flatten the waveguide. |
