ULTRAVIOLET IRRADIATION APPARATUS

An apparatus for irradiating UV rays is provided to irradiate the UV rays of 300-400 nm to the UV curing body effectively without using a cut filter for cutting the harmful UV rays less than 300 nm. An apparatus for irradiating UV rays(100) comprises a high pressure mercury lamp(1) which comprises a discharge container made of quartz glass and containing mercury of 0.08-0.13 mg/mm^3, an inert gas and halogen gas of 2x10^-4 - 7x10^-3 mumol/mm^3, and a pair of tungsten electrodes arranged with a distance of 0.5-1.5 mm in the discharge container so as to face each other and irradiates UV rays of 300-400 nm; and a light collection unit which collects the light from the high pressure mercury lamp, wherein the UV rays of 300-400 nm are collected into the region of Phi5mm or less by the light collection unit so as to be irradiated to the target body.