| 摘要 |
PROBLEM TO BE SOLVED: To produce a double-tube fluorescent lamp superior in a strength against a thermal impact/mechanical impact. SOLUTION: As for an inner tube 10 of a structure wherein lead-in wires 4, 4' are respectively protruded to the outside from respective electrodes 3, 3' arranged at both inner ends after penetrating respective sealing end parts 11, 11', a bead glass 8 for an outer tube is mounted on only one of the lead-in wires 4, 4' protruded from the both respective sealing end parts 11, 11', and the inner tube 10 is inserted into a glass tube 6 for the outer tube, and one outer tube sealing end part 22 is constituted by directly sealing and fixing the lead-in wire 4' by the glass tube 6 for the outer tube wherein the bead glass 8 for the outer tube is not mounted, and the other outer tube sealing end part 21 is constituted by sealing and fixing the lead-in wire 4 by the glass tube 6 for the outer tube together with the bead glass for the outer tube wherein the bead glass 8 for the outer tube is mounted.
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