ULTRAVIOLET LIGHT IRRADIATION APPARATUS

Provided is an ultraviolet light irradiation apparatus that is capable of emitting more ultraviolet light affecting a human body very little, without an increase in size or complexity of the apparatus as a whole, the ultraviolet light irradiation apparatus having excellent convenience, versatility, durability and the like. The ultraviolet light irradiation apparatus is provided with: a light emitting element having a light emitting surface that emits ultraviolet light; an optical system including a first incident surface on which the ultraviolet light emitted from the light emitting element is made incident, and a first output surface that outputs the ultraviolet light while converting the direction of travel of at least some of light rays included in the incident ultraviolet light; and an optical filter that has a planar second incident surface on which the ultraviolet light output from the optical system is incident, passes part of the ultraviolet light, and reflects another part of the ultraviolet light. When a light beam flux is assumed that travels from the optical filter toward the optical system along a direction normal to the second incident surface, and that is incident on the first output surface, the light emitting element is disposed in a position such that at least some of the light beam flux output from the first incident surface of the optical system irradiates a region outside the light emitting surface on a plane which is an extension of the light emitting surface of the light emitting element. L'invention concerne un appareil d'irradiation de lumière ultraviolette pouvant émettre davantage de lumière ultraviolette affectant très faiblement un corps humain, sans augmentation de la taille ou de la complexité de l'appareil dans son ensemble, l'appareil d'irradiation de lumière ultraviolette étant très pratique, polyvalent, durable, etc. L'appareil d'irradiation de lumière ultraviolette comprend : un élément électroluminescent doté d'une surface d'émission de lumière qui émet une lumière ultraviolette ; un système optique comprenant une première surface incidente sur laquelle la lumière ultraviolette émise par l'élément électroluminescent est incidente, et une première surface de sortie qui émet la lumière ultraviolette tout en convertissant la direction de déplacement d'au moins certains des rayons lumineux inclus dans la lumière ultraviolette incidente ; et un filtre optique doté d'une seconde surface incidente plane sur laquelle la lumière