| 摘要 |
PROBLEM TO BE SOLVED: To prevent a spacer fitted to an exhaust tube protruded to a tip of an inner tube and supporting the inner tube concentrically to an outer tube from falling off the tip of the inner tube, and prevent the outer tube from falling off a base. SOLUTION: Of the lamp, the outer tube 3 is formed of a glass tube with a middle part MP between its tip side TS and base side BS swollen in a spherical or ellipsoid shape, a spacer S is to be a center plate part 8 pivotally supported by an exhaust tube 7 and strip plate parts 9, 9, ..., formed so as to be radially branched from the center plate part, with the strip plate parts molded in a bent shape concentrically supporting the inner tube 2 against the outer tube 3 in an elastically deformed state so as to be tapered by being pressed inward into an inner periphery part of the tip side TS of the outer tube 3, while with a tip part 7a of the exhaust tube 7 molded in a stopper shape preventing fall-off of the center plate part 8. COPYRIGHT: (C)2010,JPO&INPIT
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