| 摘要 |
PROBLEM TO BE SOLVED: To light out remaining semiconductor light-emitting elements when at least one semiconductor light-emitting element becomes non-lighted.SOLUTION: A lightning circuit for a vehicular lamp fitting includes: three semiconductor light-emitting elements 21-23; a current supply part; non-lighting detection parts 7 and 8; a current supply cutoff part; a power supply terminal; a ground terminal; and an output terminal. When at least one semiconductor light-emitting element is non-lighted, the non-lighting detection parts 7 and 8 detect the non-lighting and output a detection signal to the current supply cutoff part. At the same time, the detection signal is also outputted through an output terminal (37) of an external terminal to a current supply cutoff part of another light source unit 1, and current supply to the remaining semiconductor light-emitting elements is also cut off. As a result, when at least one semiconductor light-emitting element is non-lighted, the remaining semiconductor light-emitting elements can be lighted out.SELECTED DRAWING: Figure 1 |
