| 摘要 |
PURPOSE:To reduce the man-hours required for the formation of a conductor passage by closely attaching a metallic sheet or film to an insulating substrate, machining the insulating substrate with laser, and simultaneously depositing a vaporized or molten metal on the machined part. CONSTITUTION:The metallic sheet 2 is closely attached to one surface of the insulating substrate 1. A laser beam 3 condensed by a lens 4 is then irradiated on the requisite part of the substrate 1 from the opposite side of the metallic sheet 2. A through-hole is formed at the requisite part of the substrate 1 by the irradiation, and the metallic sheet 2 is melted and vaporized by the laser beam 3 passing through the through-hole. When the melted or vaporized metal passes through the through-hole and is spouted from the hole, the metal is deposited on the inner surface of the through-hole to form an electrically conductive layer 5. Accordingly, the necessary conductor passage can be easily formed with less man-hours.
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