| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ultraviolet radiation device that elongates lifetime of an ultraviolet lamp and prevents the freezing of mercury to thereby control the decrease of illuminance to the utmost. <P>SOLUTION: The ultraviolet radiation device includes: an ultraviolet lamp lighting device 12 for switching and lighting an ultraviolet lamp UVL at a plurality of light levels; a shutter means 22 for switching radiation and non-radiation by passing or shutting off light from the ultraviolet lamp; a cooling means 21d for cooling the ultraviolet lamp; a control means OC for controlling a power level H of the ultraviolet lamp during radiation is larger than a power level L of the ultraviolet lamp during non-radiation, while being linked with the operation of the ultraviolet lamp lighting device and the shutter means; and a cooling power regulating means 21 for strongly or weakly regulating the cooling power of the cooling means depending on a ratio of a radiation time and a non-radiation time. Thus, the lamp is controlled such that the lamp temperature is maintained substantially constant by increasing or decreasing the cooling power depending on the magnitude of electric power applied to the lamp. <P>COPYRIGHT: (C)2009,JPO&INPIT |
