| 摘要 |
PROBLEM TO BE SOLVED: To provide a marker lamp capable of preventing its malfunction.SOLUTION: A marker lamp 12 comprises a light emitting element 17, an input unit 16, a lighting circuit 18, a lighting monitoring circuit 34, a relay 19, and a control unit 30. The input unit 16 receives, as input, constant current power from a constant current power supply device 13. The lighting circuit 18 converts the constant current power input to the input unit 16 to predetermined lighting power to supply the lighting power to the light emitting element 17. The lighting monitoring circuit 34 monitors a lighting state of the light emitting element 17. The relay 19 is interposed between the input unit 16 and the lighting circuit 18, opens a contact between the input unit 16 and the lighting circuit 18 when a drive signal is input, and closes the contact between the input unit 16 and the lighting circuit 18 when a drive signal is not input. The lighting monitoring circuit 34 determines whether the lighting state of the light emitting element 17 is normal or abnormal; the control unit 30 outputs the drive signal to the relay 19 in the case of abnormal.SELECTED DRAWING: Figure 1 |
