| 摘要 |
A light-emitting device, comprising: a planar light-emitting unit having a light-emitting surface and a non-light-emitting surface; a planar solar power generation unit having a light-receiving section and a non-light-receiving section; and a storage battery. A photoelectric conversion unit is configured by arranging the light-emitting unit and the solar power generation unit such that the non-light-emitting surface and the non-light-receiving surface are facing. The light-emitting device also comprises: a posture detection unit that detects the posture of the photoelectric conversion unit; and a connection switching unit that selectively connects the storage battery and either the light-emitting unit or the solar power generation unit, and which is arranged between the non-light-emitting surface of the light-emitting unit and the non-light-receiving surface of the solar power generation unit. The connection switching unit connects the storage battery to the solar power generation unit, if the posture detection unit has detected that the light-receiving surface of the solar power generation unit has a posture whereby same is turning towards a first direction in the photoelectric conversion unit; and the connection switching unit connects the storage battery to the light-emitting unit, if the posture detection unit has detected that the light-emitting surface of the light-emitting unit has a posture whereby same is turning towards the first direction in the photoelectric conversion unit. |
