| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle lighting fixture that can control, with low power consumption, current supplied to a light emitting element as a light source with respect to both the voltage change of an input power source and the change of an ambient temperature.SOLUTION: The vehicle lighting fixture includes: a current control circuit 10C for a voltage change, which is configured to take out a reference voltage input to a switching controller 5 from a voltage dividing resistor R2 connected between a constant voltage source Vcc and a ground GND, and supply, to the voltage dividing resistor R2, current for reducing the voltage of the voltage dividing resistor R2 when the voltage of the input power source Vin drops equally to or less than a setting value between the input power source Vin and the ground GND; and a current control circuit 10A for a temperature change, configured to supply current for reducing the voltage of a voltage dividing resistor R1 to the voltage dividing resistor R1 when a temperature detected by a temperature detection element TM1 increases equally to or more than a setting value between the constant voltage source Vcc and the GND. |
