| 摘要 |
PROBLEM TO BE SOLVED: To provide a guide light device that generates an optimum step-up voltage depending on a forward voltage (VF) of an LED module to make an LED blink with efficiency.SOLUTION: In a guide light device 10, when a blinking signal is inputted from a signal device 11, a constant current circuit 21 flows a constant current in an LED module 17 for a predetermined time period from an input time point of the blinking signal. A detection circuit 19 detects a forward voltage of the LED module 17 at the time when the constant current is flown by the constant current circuit 21. A step-up circuit 15 steps up a voltage of a secondary battery 14 charged by a charging circuit 12 and outputs the stepped-up voltage, on the basis of the forward voltage of the LED module 17 detected by the detection circuit 19. A switching element 18 switches between a state where a plurality of LEDs in the LED module 17 are lightened by the voltage outputted from the step-up circuit 15, and a state where the plurality of LEDs in the LED module 17 are extinguished, at a predetermined cycle. |
