| 摘要 |
PROBLEM TO BE SOLVED: To secure safety even if a wrong lamp replacing method is taken. SOLUTION: An opening/closing lid for replacement of a lamp which is arranged on a housing is provided with a projection part, a detection switch is arranged at a lamp unit insertion part of an optical engine part, and a leaf spring is provided to the lamp unit. At this time, only when the lamp unit is inserted and the opening/closing lid is closed, a detection switch operates and if the opening/closing lid or lamp unit is not inserted, the power source is not turned on.
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