ULTRAVIOLET IRRADIATION DEVICE

To provide an ultraviolet irradiation device that can prevent a window from being damaged and even if the window is damaged, prevent its fragments from being mixed into a fluid.SOLUTION: An ultraviolet irradiation device has a housing wall that defines a space for housing a fluid and has an opening that communicates the space with the outside, a window that transmits ultraviolet rays and is arranged on the outside of the housing wall so as to close the opening, a sheet that transmits ultraviolet rays and is arranged between the housing wall and the window so as to close the opening, and a light source for irradiating ultraviolet rays from the opening toward the space through the window and the sheet.SELECTED DRAWING: Figure 2 【課題】窓の破損を防止するとともに、窓が破損した場合でも、その破片が流体に混入することを防止できる紫外線照射装置を提供すること。【解決手段】紫外線照射装置は、前記流体を収容するための空間を規定し、前記空間と外部とを連通する開口部を有する収容壁と、前記開口部を塞ぐように前記収容壁の外側に配置された、紫外線を透過させる窓と、前記開口部を塞ぐように前記収容壁および前記窓の間に配置された、紫外線を透過させるシートと、前記窓、前記シートを介し前記開口部から前記空間へ向けて紫外線を照射するための光源と、を有する。【選択図】図２