| 摘要 |
PROBLEM TO BE SOLVED: To provide an illumination device for illuminating an object with the light of an LED through a light transmissive plate that improves a brightness uniformity. SOLUTION: A light source rod (20) has a light receiving surface 23, located in the central portion of the distant side (21) opposite to a light transmissive plate. An LED (40) is mounted on the light receiving surface (23), with the remaining region of the distant side provided with a prism array (24). Each of the prisms (25) constituting the prism array has a crest (26) and valley (27) which are arranged in parallel in the thickness direction. The light source rod has also a notch (28), formed in the near side adjacent to the light conductive plate opposite to the light receiving surface to reflect light rays toward the prism array. A reflector (29) is arranged in the center of the cut, so as to prevent the light rays from being emitted directly from the cut without being reflected. |
