| 摘要 |
[Problem to be Solved] Provided are a flexible printed circuit board that can prevent a short circuit or a crack of a wiring circuit even in a narrow casing and has an excellent bending-resistant property, and an electronic device. The flexible printed circuit board includes a polyimide insulating layer (A), a circuit wiring layer (B) formed on at least one surface of the polyimide insulating layer (A), and a coverlay (C) laminated on the circuit wiring layer (B). a) The thickness of the polyimide insulating layer (A) ranges from 10um to 14um or 23um to 27um. b) The thickness of a copper wire constituting the circuit wiring layer (B) ranges from 10um to 14um, and a cube ratio of the copper wire is 85% or more, and c) the equivalent flexural rigidity of the flexible printed circuit board when the flexible circuit board is bent with the cover layer (C) as the inside is 0.03N·m^2 to 0.04N·m^2 when the range of the thickness of the polyimide insulating layer (A) is 10um to 14um, and is 0.07N·m^2 to 0.10N·m^2 when the range of the thickness of the polyimide insulating layer (A) is 23um to 27um. |
