| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet-form light source capable of white light emission using a blue light emitting diode and observing uniform white light emission. SOLUTION: A light emitting diode 1 is connected optically with the end face of a transparent photo guide plate 2, and a diffusion layer 3 coated with white powder for diffusion of fluorescent light is provided on either of the main surfaces of the guide plate 2, and a transparent film 6 is installed on the main surface of plate 2 on its side opposite side of the diffusion layer 3 and equipped with a fluorescent substance to be energized with light emission of the diode 1 and emit fluorescence, and further a fine unevenness is provided on that surface of film 6 which is contacting with the guide plate 2. |
