| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-emitting device which can distribute light in a wide angle range while suppressing variations of illumination distribution on an irradiated surface by largely refracting a light flux in the vicinity of an optical axis of a semiconductor light-emitting element, in the light-emitting device including a light source with the semiconductor light-emitting element.SOLUTION: A light-emitting device includes: a light source having a semiconductor light-emitting element and a hemispherical transparent sealed body for sealing the semiconductor light-emitting element; and an optical member for controlling light distribution characteristics of light emitted by the semiconductor light-emitting element. The shape of the optical member includes: a concave inner contour for housing the hemispherical transparent sealed body, a bottom surface contour connected to the periphery of the inner contour, and an outer contour connected to the bottom surface contour. When a vertical axis with respect to a light-emitting surface in an emission center of the semiconductor light-emitting element is determined as an optical axis, an interval between a surface of the hemispherical transparent sealed body in an optical axis direction and the concave inner contour becomes the longest and an area forming an angle equal to or more than 45° from the emission center to the optical axis has a part with the shortest interval. |
