ULTRAVIOLET IRRADIATION APPARATUS USING ULTRAVIOLET LIGHT-EMITTING DIODE

PROBLEM TO BE SOLVED: To solve the problems such as operational instability, insufficient illuminance, and non-uniformity of irradiation of a light-emitting diode due to heat, and power saving. SOLUTION: In an ultraviolet irradiation apparatus, heat is dissipated by using a wiring board 24 made of a metal material excellent in thermal conductivity as a base material while the board 24 mounting ultraviolet light-emitting diodes 22 is integrated with a radiator 25. As for insufficient illuminance, ultraviolet rays are parallelized by using a condenser lens 23 covering the entire board 24 as a light source, and the board 24 mounting a plurality of much more diodes is used to increase the illuminance. As for non-uniformity of irradiation, parallelism and flatness of a light source unit and an illuminated body 12 are improved by preventing the illuminated body from being curved by a special glass plate 15. Variation of an irradiation area of individual diode is suppressed by devising an arrangement of the ultraviolet light-emitting diodes 22. As power saving countermeasures, the ultraviolet irradiation apparatus includes a controlling unit-1 42 (for the light source) capable of setting ON/OFF of ultraviolet light-emitting diodes 22 corresponding to a size and shape of the illuminated body by individually controlling each blocks of the board 24. COPYRIGHT: (C)2010,JPO&INPIT