To provide a discharge lamp apparatus which prevents a trouble caused by incomplete connection between a connection terminal connected to an electrode of a cold cathode discharge lamp and a connector connected to a lighting device.
When a connector 50A at the high-voltage side is in a state of incomplete connection to a connection terminal 36, abnormal discharge may occur between one contact piece 36a and one edge receptacle 51a, but discharge does not occur between the other contact piece 36b and the other edge receptacle 51b because resistors R1 and R2 have impedance higher than the equivalent impedance of a cold cathode fluorescent lamp 3. Specifically, the resistor R1 connected to the contact piece 36b of the connector 50A at the high-voltage side becomes equivalent to an open state, which lowers a detection voltage Vi to a voltage equal to or lower than the lower limit VL of a window comparator WC. As a result, output from a detection circuit 70 goes high, which causes a control circuit 71 to turn off a switchover switch S to open a feed path from a dc power supply DC to stop an inverter circuit INV.
YAMASHITA KOJI
MATSUZAKI JUN
TATENO YOJI
Atsuo Mori
Next Patent: DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE