| 摘要 |
PURPOSE:To form a fine circuit pattern easily on a ceramic board positively in a short time by continuously conducting each process of the formation of a conductor pattern, the formation of a through-hole and the formation of a conductor in the through-hole in the method of forming the circuit pattern by utilizing a laser beam. CONSTITUTION:The unnecessary sections 3a, 3b of conductor foils 2a, 2b are removed by irradiating the surface of a ceramic board 1, on which the conductor foils 2a, 2b are laminated, with a laser beam A and desired conductor patterns 4a, 4b are formed on the ceramic board 1, a through-hole 5 is shaped in a position where the electrical joining of both surfaces of the conductor patterns 4a, 4b is required is formed by the irradiation of the laser beam A, and a solder ball 6 is placed at the opening end of the through-hole 5, and irradiated with the laser beam A, thus forming a conductor 7. |
