| 摘要 |
PROBLEM TO BE SOLVED: To obtain a printed wiring board which is protected against a connection failure and chipping, and easily positioned or handled in a manufacturing process by a method wherein a magnetic body is provided on the board at a position so as not to get in the way of a wiring pattern and electronic parts to mount. SOLUTION: A printed wiring board 1 is of four-layered structure composed of a first board 1a in which a connection pattern is formed, a second board 1b in which a grounding pattern is formed, a third board 1c with a power supply pattern, and a fourth board 1d in which a connection pattern is formed. A thin magnetic body 10 formed of metal magnetic body of iron, nickel, chrome or alloys of them or permanent magnet such as ferrite magnet, Alnico magnet, or proccessable alloy magnet is formed on the surface of the second board 1b so as not to get in the way of the grounding pattern by a proper means such as sputtering, deposition, or application. It is preferable that the magnetic bodies 10 are provided at as near the center of the second board 1b as possible. |
