| 摘要 |
PURPOSE: A lighting device is provided to improve luminous flux by fitting the inner angle of an optical excitation plate to the directional angle of a light emitting device. CONSTITUTION: A radiation body(100) has a flat surface. A light emitting device(300a,300b) is arranged on a substrate(200). An optical excitation plate(400) is separated from the light emitting device and excites the light of the light emitting device. The optical excitation plate partially surrounds the light emitting device and the upper part of the substrate. The inner angle of the optical excitation plate is same as the directional angle of the outermost light emitting device. |
