WINDOW LIGHTING DEVICE

To provide a window lighting device capable of saving power by using sunlight.SOLUTION: A window lighting device of the present invention has a light source, a light guide unit, and a power source that supplies power to the light source. The light guide unit has a light guide plate that guides light emitted from the light source, and a photovoltaic power generation unit that receives sunlight and generates power. The light guide plate has: a light incident end surface that faces the light source, and into which light emitted from the light source is made incident; and a light emission unit included in a predetermined main surface of the light guide plate that intersects with the light incident end surface, and from which light guided within the light guide plate is emitted. The photovoltaic power generation unit is provided on a main surface opposite to the predetermined main surface of the light guide plate, and supplies generated power to the power source.SELECTED DRAWING: Figure 1 【課題】太陽光を利用して節電可能な窓照明装置を提供すること。【解決手段】本発明の窓照明装置は、光源と、導光部と、前記光源に電力を供給する電源と、を有し、前記導光部は、前記光源から射出された光を導光する導光板と、太陽光を受光して発電する光発電部と、を有し、前記導光板は、前記光源に対向し、前記光源から射出された光が入射する光入射端面と、前記光入射端面に交差する前記導光板の所定主面に含まれ、前記導光板内を導光された光が出射する光出射部と、を有し、前記光発電部は、前記導光板における前記所定主面に対向する対向主面側に設けられ、発電電力を前記電源に供給する。【選択図】図１