LUMINAIRE, IMAGE SENSOR UNIT AND PAPER IDENTIFICATION DEVICE

PROBLEM TO BE SOLVED: To achieve uniformity of illuminance distribution of light of a wavelength in which an absorption rate of a light guide body is high.SOLUTION: A luminaire 1 has: a light source 11 for emitting light of a plurality of wavelengths; and a rod-like light guide body 12 for making the light emitted by the light source 11 linear and emitting it from an emission surface 122 provided on a surface in the longitudinal direction. The light guide body 12 is made of a material having a wavelength region in which transmittance is not constant and a wavelength region in which the transmittance is constant with respect to light. The light emitted by the light source 11 includes the light in the wavelength region in which the transmittance in the light guide body 12 is not constant and the light in the wavelength region in which it is constant. The light source 11 is provided in the vicinity of one end part in the longitudinal direction of the emission surface 122, and on the other end in the longitudinal direction, a reflector 127 is provided in which reflectance with respect to the light in the wavelength region where the transmittance is not constant and the reflectance with respect to the light in the wavelength region where the transmittance is constant are different. 【課題】導光体の吸収率が高い波長の光の照度分布の均一化を図る。【解決手段】照明装置１は、複数の波長の光を発する光源１１と、光源１１が発する光を長手方向の面に設けられた出射面１２２より線状化して出射する棒状の導光体１２とを有し、導光体１２は、光に対して透過率が一定でない波長域と一定な波長域を有する素材からなり、光源１１の発する光は、導光体１２における透過率が一定でない波長域内の光と一定な波長域内の光を含み、光源１１は、出射面１２２の長手方向の一方の端部近傍に設けられるとともに、長手方向の他方の端部には透過率が一定でない波長域内の光に対する反射率と透過率が一定な波長域内の光に対する反射率とが異なる反射材１２７が設けられる。【選択図】図３