| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breaking of wiring pattern, fuming and firing by detecting liquid leakage in the service state of a printed circuit board mounted with electrical parts such as an aluminum electrolytic capacitor containing conductive liquid internally. SOLUTION: A liquid leakage detecting pattern 2 and a detecting circuit 8 for applying specified voltage to the detecting pattern 2 to monitor are provided directly below the mounted position of an electrical part with the possibility of liquid leakage on a printed circuit board 5. In the case of conductive liquid leaking, the voltage change of the detecting pattern 2 caused by the short circuit between the detecting pattern 2 and a terminal of the electrical part is detected to detect the liquid leakage of the electrical part. Accordingly, when a fault is developed to a device using an aluminum electrolytic capacitor or a battery having conductive liquid internally, an accident such as the breaking of wiring pattern, fuming and firing can be prevented. |
