| 摘要 |
PROBLEM TO BE SOLVED: To provide a printed wiring board used for various kinds of electronic devices which is provided with a connector connecting part which produces no silver ion migration, even at narrow pitch and is superior in electrical connection stability and insertion/pulling durability. SOLUTION: The connection pattern of a connector connection part is composed of a carbon film 13, which is printed directly and formed on an insulation board 11 and of which sheet resistance is 25Ω/sq or higher and 1 kΩ/sq or lower and pencil hardness is 2H or higher and 7H or lower. Therefore, even if the board has a narrow pitch, generation of silver ion migration can be prevented, and the sheet resistance and hardness of the carbon film 13 is set to be within a prescribed range, resulting in a connector connecting part which is superior in electrical connection stability and insertion/pulling durability.
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