| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lamp non-lighting detecting device for illumination appa ratus that detects abnormality of the lamp regardless of the wattage of the lamp and facilitates maintenance works by identifying the factors of abnormal ity. SOLUTION: This lamp non-lighting detecting device for illumination apparatus that is installed on an illumination apparatus body or its column and monitors lighting state of a discharge lamp, comprises a current detecting circuit 10 for reading the lamp current, a current storing circuit 11 that reads the lamp current at the initial stage of lighting by the current detecting circuit and stores the value as a lamp current reference value, and a judgement circuit 12 that establishes a lamp current normal range computed with the above lamp current reference value as a central point, and compares the current value having been read with the above lamp current normal range and judges as normal when it is in the normal range and judges as abnormal when it is outside the normal range, and identifies the abnormal factors when it judges as abnormal.</p> |
