PROBLEM TO BE SOLVED: To provide a light irradiator capable of achieving a uniform light outgoing pattern by a simple configuration.SOLUTION: The light irradiator comprises: a light source 10 a light guide part 120 including a first opening end 120c, a second opening end 120d, and a cylindrical inside surface 120e located between the first opening end 120c and the second opening end 120d and having a central axis and a connection part 140 located at the second opening end 120d of the light guide part 120 for connecting the light source 10 to the light guide part 120. The inside surface 120b of the light guide part 120 has an N-polygonal (N is an integer equal to or more than 5) shape in a cross section perpendicular to the central axis.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】簡単な構成によって、均一な光の出射パターンを実現し得る光照射器を提供する。【解決手段】光照射器は、光源10と、第1の開口端120c、第2の開口端120d、および、第1の開口端120cと第2の開口端120dとの間に位置し、中心軸を有する筒形状の内側面120eを含む導光部120と、導光部120の第2の開口端120dに位置し、光源10と導光部120とを接続する接続部140とを備え、導光部120の内側面120bは、中心軸と垂直な断面においてN角形(Nは5以上の整数)の形状を有する。【選択図】図1
