UV irradiation apparatus

摘要

In a memory unit 6, there is stored a correction table for each candidate value of an output set value of each of LED units 2. If UV rays have ever been emitted so far by the LED units 2, each of which is formed of a plurality of LED chips 8, then a PLC 5 acquires, upon setting of a output set value by an operation unit 53, a correction value corresponding to a cumulative emission time up to a previous emission, from the correction table of the output set value. Thereafter, the PLC 5 sets the magnitude of the power supplied to each of the LED units 2 using the acquired correction value. If an output set value different from a previous output set value is set, the PLC 5 obtains the correction value starting from the cumulative emission time upon modification. As a result, the UV irradiation apparatus enables power consumption necessary for emission of UV rays to be reduced, and UV ray output to be kept constant regardless of the cumulative emission time, even if the output set value is modified.

主权项

1. A UV irradiation apparatus, comprising:
an LED unit that is formed of a plurality of LED chips and that emits UV rays when supplied with current; measurement means for measuring an emission time of the LED unit; setting means for setting an output set value of the LED unit from among a plurality of candidate values; memory means for storing beforehand a Plurality of correction tables corresponding to the plurality of candidate values that can be set by the setting means, respectively; and emission control means for setting a power supplied to the LED unit, wherein a cumulative value of the emission time is set to a cumulative emission time, each of the plurality of correction tables associates, to each cumulative emission time, a correction value used for setting the power supplied to the LED unit in order to correct an output drop of each LED chip, the emission control means obtains a correction value of the cumulative emission time using a correction table corresponding to an output set value that has been set by the setting means, among the plurality of correction tables, and sets the power supplied to the LED unit using the obtained correction value, and in a case where the output set value is modified by the setting means, the emission control means extracts a correction value corresponding to the cumulative emission time upon modification using one correction table corresponding to the output set value before modification, table corresponding to the output set value after modification, among the plurality of correction tables, extracts a cumulative emission time corresponding to the extracted correction value from said another correction table, sets the extracted cumulative emission time to a new cumulative emission time after modification, obtains the correction value for each cumulative emission time after the new cumulative emission time in said another correction table in such a manner that the output of the LED unit after modification is kept within an allowable range, and sets the supply power using the obtained correction value.