Patent ID: 7914197

Claim:
A light guide member that is made of a transparent resin and that is disposed in abutting contact on a substrate on which a luminescent device which generates light of a first color with a radiation peak wavelength in the range of 380 to 490 nm is mounted in abutting contact, for diffusing lights emitted from the luminescent device and guiding the lights upward, the light guide member comprising: a first area composed of the resin which has no luminescent substance dissolved therein, a second area in which there is dissolved in the resin a luminescent substance that generates light of a second color by an excitation due to the light of the first color emitted from the luminescent device, wherein the light of the second color has a radiation peak wavelength at a wavelength different from the radiation peak wavelength of the first color, and a third area in which there is dissolved in the resin a luminescent substance that generates light of a third color by an excitation due to the light of the first color emitted from the luminescent device, wherein the light of the third color has a radiation peak wavelength at a wavelength different from the radiation peak wavelength of the first and second colors.