| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an illuminating device with high electro-optical conversion efficiency. <P>SOLUTION: In a wavelength conversion part 60, distribution of an amount of a fluorescent substance is set corresponding to light intensity distribution of a primary light 31 incident on a wavelength conversion part 60 in a planar direction of an incident face S of the wavelength conversion part 60. Concretely, the distribution of the primary light 31 emitted from an excitation light source 10 has a high density at a crossing position of an optical axis of the excitation light source 10 having an angle of 0° formed by a segment connecting an arrangement position of the excitation light source 10 and the optical axis and a position on a primary light incident face of the wavelength conversion part 60, and near the crossing position (at a center part), and a low density as it is away from the crossing position. Fluorescent substances 40 and 41 are arranged in proportion to magnitude of the density of the primary light 31. That is to say, at the center part, at which the distribution of the primary light 31 has a comparatively high density, concentrations of the fluorescent substances 40 and 41 are made relatively larger than a peripheral part. <P>COPYRIGHT: (C)2013,JPO&INPIT |
