| 摘要 |
PURPOSE:In the formation of the counterbored part of a ceramic multilayer board, to form a counterbored part excellent in dimension accuracy by placing a plate material at the counterbored part so that the surface may be a little higher than the surface of a laminate and packaging it in vacuum with a film, and then laminating it. CONSTITUTION:Ceramic sheets 2, which have openings 3 and where circuits are made, are laminated, and ceramic sheets 10, which are the same shapes and the same kinds as the opening 3 of the ceramic laminate 2, and a film 11 fitted with a mold lubricant are placed in the opening 3. At that time, the board materials of the ceramic sheets 10 and the film 11 placed in the opening 3 are placed so that the upsides may be a little higher than the upsides of the ceramic sheets 2. Then, this laminate structure is packaged in vacuum with a film 7, and is laminated by giving temperature and pressure uniformly by a medium 8, and after lamination the board material placed in the opening 3 is removed, thus a counterbored part 3a is made. Hereby, a counterbored part 3a excellent in dimension accuracy can be made cheaply. |
