PROBLEM TO BE SOLVED: To provide an illumination device for a vehicle cabin which can obtain optimal uniformity ratio of illuminance with a small luminous source by efficiently and uniformly diffusing light from a luminous source over a wide range.SOLUTION: An illumination device for a vehicle cabin comprises: an interior material body 15 which includes an illumination window part 21; a tabular light guiding member 19 in which a light incident surface 19a is irradiated with light from a luminous source 18, and the incident light is diffused and reflected inside of the light guiding member to emit it from a light emission surface 19e; a concavity 22 with a U-shaped cross section which is arranged on the light incident surface 19a to face the luminous source 18; and a plurality of total reflection cut surfaces 23 which are respectively arranged stepwise going down sequentially from the concavity 22 side to outside at both sides sandwiching the concavity 22 on the light incident surface 19a so that the incident light from the concavity 22 to inside of the light guiding member 19 is diffused and reflected into the light guiding member 19.SELECTED DRAWING: Figure 4

    【課題】光源からの光を広範囲に効率良く均斉に拡散させて、少ない光源で最適な均斉度を得ることができる車両室内用照明装置を提供する。【解決手段】照明用窓部21を有する内装材本体15と、光源18からの光が照射される光入射面19aと入射された光を内部で拡散反射させて光出射面19eより出射させる板状の導光部材19と、光入射面19aに光源18と対向して設けられた断面U字状の凹部22と、光入射面19aの凹部22を挟んだ両側の位置に、凹部22側から外側へ向かって順に下る階段状にして各々設けられ、凹部22から導光部材19内部に入射された光を導光部材19内に向けて拡散反射させる複数の全反射カット面22と、を設けた。【選択図】図4


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    Titel :

    ILLUMINATION DEVICE FOR VEHICLE CABIN


    Weitere Titelangaben:

    車両室内用照明装置


    Beteiligte:
    SEKI TOSHIHIKO (Autor:in) / OSHINA MASATO (Autor:in) / TORIKAI KEISUKE (Autor:in)

    Erscheinungsdatum :

    2016-04-04


    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



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