| 摘要 |
Disclosed is an illumination device that can easily set color balance. The illumination device comprises an excitation light source and a wavelength conversion member positioned in front of the excitation light source. If the main emission axis for excitation light immediately prior to radiation on to the wavelength conversion member is an optical axis within the illumination device, a light conversion member is formed by a plurality of phosphors that absorb excitation light and emit fluorescence with a different peak wavelength to the peak wavelength of the excitation light, the plurality of phosphors are positioned on each of the plurality of regions into which the wavelength conversion member has been divided, the wavelength conversion member has an excitation light illumination surface that faces the excitation light illumination surface of the excitation light source, the optical axis passes through the center of the excitation light illumination surface, the plurality of phosphors are separately disposed within the excitation light illumination surface of the wavelength conversion member, with substantially equivalent circumferential direction area ratios, regardless of radius, wherein said ratios are defined as the surface area ratio occupied by each on the concentric-circle shaped annular belt regions that have the center of the excitation light illumination surface as the center thereof. . |
