| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent degradation of illuminance even when low-temperature air flows into a luminaire. <P>SOLUTION: In this ceiling-embedded fluorescent lamp luminaire 990, a luminaire body 500 is provided with a socket mounting part 520 for mounting an amalgam lamp 700 thereto, and a heat radiation hole 300 is arranged beside the socket mounting part 520. The ceiling-embedded fluorescent lamp luminaire 990 includes: a heat radiation valve 100 opening/closing the heat radiation hole 300; and an actuator 200 opening/closing the heat radiation hole 300 by vertically moving the heat radiation valve 100 by temperature variation. The actuator 200 has a structure composed by combining a spring made of a shape memory alloy changed in temperature, and a normal spring. The spring made of the shape memory alloy is extended in temperature rise to lift the heat radiation valve 100 to open the heat radiation hole 300, and the normal spring is extended in temperature lowering to lower the heat radiation valve 100 to close the heat radiation hole 300. Thereby, the temperature of an amalgam 710 part is kept constant, and degradation of the luminous flux of the amalgam lamp 700 is prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT |
