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摘要

PROBLEM TO BE SOLVED: To provide a light-dimming device capable of facilitating the design of an optional function performed for individual specifications, preventing a short circuit caused by screws, and the space saving of copper bars for coupling boards, and facilitating inspection.;SOLUTION: The light dimming device 10 is provided with a main board 11 incorporating a main breaker with a free space 12 at a lower part, and light-dimming boards 13, 14 having unit spaces 20 to 29 mounted with light-dimming units with dimming functions and cooling fans 30 at an upper part of the unit spaces 20 to 29. A plurality of dimming boards 13, 14 can be coupled to the main board 11, and the unit spaces 20 to 29 formed into the same shapes as the light-dimming units can be freely exchanged between optional units having an optional function and the light-dimming units.;COPYRIGHT: (C)2010,JPO&INPIT