| 摘要 |
PURPOSE:To prevent that the surface of a circuit pattern is damaged when a circuit board is irradiated with a UV-region laser beam and it is worked fine and to prevent that a resin-decomposed substance adheres to the circuit hoard. CONSTITUTION:A circuit board in which circuit patterns 12 have been formed on one face or on both faces of an insulating resin layer 1 is irradiated with a high-energy UV-region laser beam; a hole part 4 is formed in the insulating resin layer 1. Before that, cover resin layers 3 are formed on the surface of the circuit patterns 12. Alternatively, as another manufacturing method, protective metal layers can be formed on the surface of the circuit patterns 12. |
