PROBLEM TO BE SOLVED: To provide a planer lighting device which can inhibit luminance unevenness.SOLUTION: A planer lighting device according to an embodiment includes a light guide plate, a light source and an absorption member. In the light guide plate, a through hole is formed between a light incident end surface into which light is introduced and an opposite end surface which is an end surface at the opposite side of the light incident end surface. The light source is provided at the light incident end surface side and emits the light to the opposite end surface side. The absorption member is provided in at least a part at the side of a peripheral surface of the through hole, which faces the light source, and absorbs the light.SELECTED DRAWING: Figure 1


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    Titel :

    面状照明装置


    Erscheinungsdatum :

    2020-06-17


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE , Anzeigen oder Aufzeichnen in Verbindung mit Messen allgemein / G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS