CIRCUIT BOARD WITH DISCONNECTED WIRE DETECTION CIRCUIT

PROBLEM TO BE SOLVED: To provide a circuit board with a broken wire detection circuit capable of preventing increase in the number of components and of achieving miniaturization, a manufacturing method therefor, and a disconnected wire detection device. SOLUTION: The broken wire detection device 1 comprises an FPC harness 40 including a circuit board with a broken wire detection circuit 10 and connectors 31-34, and a broken wire detecting base unit 20. The circuit board with a broken wire detecting circuit 10 has bendable flexible circuit parts 11-14 on which a plurality of circuit patterns comprising conductors formed in a planar shape, wherein from among the plurality of circuit patterns, a circuit pattern on the outermost marginal part side of each flexible circuit part 11-14 constitutes a broken wire detecting loop circuit 15, while the rest of the circuit patterns constitutes a signal circuit 16. In terminal of the flexible circuit parts 11-13, the signal circuit 16 is exposed. A cut 17 is formed between the exposed signal circuit 16 and broken wire detecting loop circuit 15, and the broken wire detecting loop circuit 15 along the cut 17 is folded back toward the base end side of each flexible circuit 11-13 to form a connector connecting part 18. COPYRIGHT: (C)2006,JPO&NCIPI