| 摘要 |
PURPOSE: To provide a printed circuit with a selected easily solderable surface (for instance, pad, through hole and land) for helping the next connection to it of an electronic component by soldering. CONSTITUTION: In a printed circuit, having an exposed electrically conductive surface to which an electronic component can be connected by soldering, the exposed electrically conductive surface is made of copper, a coating (mainly made of a metal selected from a group composed of nickel and cobalt) on the copper and a coating (mainly made of a protective material) on the nickel or the cobalt. |
