| 摘要 |
PURPOSE:To enhance the humidity resistance by a method wherein the rear surface and the circumferential side surface of a substrate are coated with a silicone resin layer while the part coating the inner side surface out of the substrate surface and silicon resin layer is coated with a glassy material added phenol resin layer. CONSTITUTION:The rear surface assumed as the surface is coated with silicone resin using a dispenser 27. Next, after thermo-setting the coated silicone resin, a ceramic substrate 2 is dipped in a glass fiber added phenol resin solution 29 so as to immerse the surfaces 2b and 2c in the solution 29 and then the substrate 2 is picked up. Through these procedures, the substrate 2 is coated with the phenol resin solution and thermo-set while the surface 2b is covered with a silicone resin layer 25 which is reversely covered with a part of the surface 2b for the formation. |
