| 摘要 |
PROBLEM TO BE SOLVED: To provide a both-sided flexible circuit board that is used while the board is repetitively bent in one direction and can prevent the disconnection of a circuit wiring pattern caused by compressive strains resulting from the bending. SOLUTION: This flexible circuit board has a first circuit wiring pattern 12 on the first surface of a flexible insulating base material and a second circuit wiring pattern 13 on the second surface of the base material and is provided with surface protective layers 16 and 19, each composed of a flexible resin film and an adhesive layer, on the the first and second circuit wiring patterns. The first circuit wiring pattern 12 is positioned so that the pattern 12 may come to the outside in the bending direction when the circuit board is bent with respect to the center line of the board in the thickness direction and the second circuit wiring pattern 13 is positioned so that the the pattern 13 may come to the inside in the bending direction. At the same time, the circuit wiring patterns 12 and 13 and surface protective layers 16 and 19 are constituted so that the position of the inside side face of the second circuit wiring pattern 13 in the bending direction may approach the center of the circuit board in the thickness direction. COPYRIGHT: (C)2004,JPO
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