To prevent an offensive sound generated in a certain period after a luminaire is turned on or off.
The surface contact between the screw part of a luminaire body and the screw part of a globe 24 which are to be screwed with each other is uniformed by dividing a male screw part 27 projecting from the periphery of the screw part 26 by forming a certain space such as a bent recessed part 28 or the like at one or more parts in the longitudinal direction of the screw part 26 of the globe 24. Thereby, a false fixed part is kept from being produced, the generation of an impulsive sound caused by the false fixed part is avoided even if the globe is expanded due to the heat generated by lighting the luminaire, and thereby, the generation of an offensive sound that is responsible for giving a user uncomfortable feeling or uneasy feeling such as a failure or the like can be prevented.
KUWABARA MASAHIRO
SAKAMOTO YOSHIYUKI
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