| 摘要 |
PROBLEM TO BE SOLVED: To enable a double-sided conductor layer to be improved in electrical connection reliability and lessened in manufacturing cost by a method, wherein a through-hole provided in the conductor layer is filled up with a conductor by a punching press to electrically connect the conductor with a wiring layer. SOLUTION: Sprocket holes or through-holes are provided in a double-sided copper laminated polyimide tape by a press. Thereafter, the front of the copper laminated polyimide tape is surfaced, photoresist is applied onto the polyimide tape, and a wiring layer is formed on the front surface of the copper laminated polyimide tape through exposure, development, and etching. Then, similarly, the rear of the copper laminated polyimide tape is surfaced, photoresist is applied onto the rear of the polyimide tape, and a wiring layer is formed on the rear surface of the copper laminated polyimide tape through exposure, development, and etching. In this process, through-holes are provided in the polyimide tape by a punching process, and the through-holes are filled with a conductor 3 by a punching press, by which the conductor 3 is electrically connected to the wiring layer 2 or a metal foil. The through-hole of a two-metal TAB is composed of an insulating board 1, a wiring layer 2, and the conductor 3.
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