To provide a lighting circuit uniformizing lighting periods.SOLUTION: A lighting circuit includes: a rectangular wave output circuit where an output voltage is changed to a second level lower than a first level from the first level when the voltage of a capacitor rises to a first threshold value voltage after a power source voltage is supplied, and the output voltage is changed to the first level from the second level when the voltage of the capacitor decreases to a second threshold value voltage lower than the first threshold value voltage; a charge circuit charging the capacitor during a prescribed period of time after the power source voltage is supplied to the rectangular wave output circuit; and a drive circuit intermittently lighting a light source on the basis of the output voltage. The charge circuit charges the capacitor up to a voltage higher than the second threshold value voltage and lower than the first threshold value voltage during a prescribed period of time.SELECTED DRAWING: Figure 4
【課題】点灯の期間の均一化を図ることのできる点灯回路を提供する。【解決手段】電源電圧が供給された後、コンデンサの電圧が上昇して第1閾値電圧となると出力電圧を第1レベルから前記第1レベルより低い第2レベルに変化させ、前記コンデンサの電圧が低下して前記第1閾値電圧より低い第2閾値電圧となると、前記出力電圧を前記第2レベルから前記第1レベルに変化させる矩形波出力回路と、前記電源電圧が前記矩形波出力回路に供給されてから所定期間、前記コンデンサを充電する充電回路と、前記出力電圧に基づいて光源を間欠的に点灯させる駆動回路と、を備え、前記充電回路は、前記所定期間において前記コンデンサを、前記第2閾値電圧よりも高く、前記第1閾値電圧よりも低い電圧まで充電する点灯回路。【選択図】図4
LIGHTING CIRCUIT AND VEHICLE LIGHTING FIXTURE
点灯回路、及び車両用灯具
2024-09-30
Patent
Electronic Resource
Japanese
IPC: | B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein |