| 摘要 |
Predetermined wiring of copper is formed on the upper surface of an elongated base film in a wiring forming area as a width-directional central portion of the base film. Further, band-shaped first reinforcing layers of copper are formed on width-directional opposite portions of the upper surface of the base film. As a result, even if the base film has a relatively thin thickness, portions of the base film near sprocket holes can be made to have a substantially desired strength. To keep the first reinforcing layers out of contact with the pins of a transfer pin roller, opening slightly larger than the sprocket holes are formed in the first reinforcing layers.
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