| 摘要 |
PROBLEM TO BE SOLVED: To prevent a tracking phenomenon at a conductive part by preventing invasion of water even when the water splash from the outside. SOLUTION: In a luminaire connected with each conductive parts of a lamp cap 30 and a socket 5, at least one of surfaces where the socket 5 and the lamp cap 30 are opposed to each other has a groove part 35 having a width on which capillarity is generated outside the conductive parts. Even when water is invaded between the lamp cap 30 and the socket 5, the water is socket into the groove part 35 by capillarity, and is kept from invasion further. Therefore, a tracking phenomenon is hardly generated between the conductive parts even when the water splash. In addition, the groove part 35 is formed between the conductive parts set as an unlike pole to each other at least, and is formed in a circumferential direction surrounding the conductive parts, so that the invasion of the water is hardly generated in the unlike pole conductive parts to surely prevent the invasion of the water on a lamp holder 36. |
