PROBLEM TO BE SOLVED: To solve the problem in which, in a conventional vehicular lighting fixture system, there is a case in which a plurality of pieces of semiconductor light emitting elements in a state of light emission turn off.SOLUTION: A lighting circuit for a vehicular lighting fixture includes: three semiconductor light emitting elements 21-23; an input voltage monitoring detection unit; a field effect transistor FET1; and a current control supply unit. When an input voltage V1 drops to equal to or less than a predetermined voltage value, the input voltage monitoring detection unit outputs a first detection signal simultaneously with the field effect transistor and the current control supply unit. The field effect transistor reduces the number of the semiconductor light emitting elements in a state of light emission from three pieces to two pieces, that is 21, 22. The current control supply unit increases the supply current to the two semiconductor light emitting elements. As a result of this, as long as the input voltage is within a voltage change range in operation guarantee of a battery, the light emission state of the two semiconductor light emitting elements can be maintained.

    【課題】従来の車両用灯具システムでは、発光状態の複数個の半導体発光素子が消える場合がある。【解決手段】この発明は、3個の半導体発光素子21〜23と、入力電圧監視検出部と、電界効果トランジスタFET1と、電流制御供給部と、を備える。入力電圧V1が所定電圧値以下に低下すると、入力電圧監視検出部は、第1の検出信号を、電界効果トランジスタと電流制御供給部とに同時に出力する。電界効果トランジスタは、発光状態の半導体発光素子の個数を3個から2個21、22に減らす。電流制御供給部は、2個の半導体発光素子への供給電流を増やす。この結果、この発明は、入力電圧がバッテリーの動作保証における電圧変化範囲内であれば、2個の半導体発光素子の発光状態を維持することができる。【選択図】 図1


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    Titel :

    LIGHTING CIRCUIT FOR VEHICULAR LIGHTING FIXTURE, LIGHT SOURCE UNIT FOR VEHICULAR LIGHTING FIXTURE AND VEHICULAR LIGHTING FIXTURE


    Weitere Titelangaben:

    車両用灯具の点灯回路、車両用灯具の光源ユニット、車両用灯具


    Beteiligte:
    NAKANO KATSUAKI (Autor:in) / MATSUOKA KENJI (Autor:in)

    Erscheinungsdatum :

    2015-12-03


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    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 / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES



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