PROBLEM TO BE SOLVED: To provide a light irradiation device that can improve a therapeutic effect by locally irradiating an ultraviolet ray in an affected area by a simple operation.SOLUTION: The light irradiation device includes: an ultraviolet pulse light source 1 that radiates a pulse light having emission spectrum of an ultraviolet region a light guide 2 that guides the pulse light from the ultraviolet pulse light source 1 from an incidence surface of one end and emits the pulse light from an emission surface of the other end a spherical lens 3 that is arranged at the emission surface side of the light guide 2 a tubular needle that is slidably arranged along an outer circumferential surface of the light guide 2 in an emission surface side of the light guide 2 and can cover the emission surface side of the light guide 2 together with the spherical lens 3 and expose the spherical lens 3 and a guide pipe 5 that guides the sliding of the tubular needle along the outer circumferential surface of the light guide 2.COPYRIGHT: (C)2013,JPO&INPIT【課題】操作が簡単であるにもかかわらず、患部の内部で局所的に紫外光を照射して治療効果を高めることができる光照射装置を得る。【解決手段】紫外線領域の発光スペクトルを有するパルス光を放射する紫外パルス光源1と、紫外パルス光源1からのパルス光を一端の入射面から導入し他端の出射面から出射させるライトガイド2と、ライトガイド2の出射面側に配置されている球状レンズ3と、ライトガイド2の出射面側においてライトガイド2の外周面に沿って摺動可能に配置されライトガイド2の出射面側を球状レンズ3とともに覆う態様と球状レンズ3を露出させる態様をとらせることができる管状の針と、ライトガイド2の外周面に沿う管状の針の摺動を案内する案内パイプ5と、を有する。【選択図】図1
