| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED disconnection detection device capable of performing detection of disconnection without lighting-on an LED. SOLUTION: The LED disconnection detection device includes: a pulse signal feeding means 2 for feeding a pulse signal P1c of pulse width of the degree that the LED 15 is not lighted-on to the LED 15; and a disconnection existence detection means 8 for detecting existence of disconnection of the LED 15 when the pulse signal P1c is fed to the LED 15. Disconnection of the LED 15 can be detected without lighting-on the LED 15 in the state that the LED 15 is lighted-off. COPYRIGHT: (C)2010,JPO&INPIT
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