| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a circular fluorescent lamp in which the coldest point temperature of a circular fluorescent lamp where three or more concentric circular luminous tubes are linked can be controlled suitably, and to provide a lighting fixture. <P>SOLUTION: A circular fluorescent lamp 1 comprises an outer circular luminous tube 2, an inner circular luminous tube 3 disposed on the inside of the outer circular luminous tube 2 concentrically thereto, and an intermediate circular luminous tube 4 disposed concentrically between the outer circular luminous tube 2 and the inner circular luminous tube 3. The outer circular luminous tube 2 and the intermediate circular luminous tube 4 are linked by a linking portion 5, whereas the inner circular luminous tube 3 and the intermediate circular luminous tube 4 are linked by a linking portion 6. The interval d1 between the outer circular luminous tube 2 and the intermediate circular luminous tube 4 adjacent thereto is set larger than the interval d2 between the inner circular luminous tube 3 and the intermediate circular luminous tube 4 adjacent thereto (d1>d2). <P>COPYRIGHT: (C)2013,JPO&INPIT |
