| 摘要 |
PURPOSE:To provide a printed circuit base material excellent especially in high-frequency characteristics and lessened in DC leakage current and an electrical connecting structure capable of making an electrical connection of high density and reliability with a contacting conductor. CONSTITUTION:A first conductor pattern 4 is formed on the one side of a dielectric film 2, a second conductor pattern 8 is provided onto the other side of the film 2, and one or more fine conductor projections 6 are provided to a part of the first conductor pattern 4. At this point, the fine conductor projection 6 is 5 to 500mum in diameter and formed into a shape like a ball, a mushroom or the like. |
