PURPOSE: To improve light distribution of a discharge lamp having a plurality of light emitting tubes connected electrically in parallel within an external tube by providing a partition wall plate of special width between adjacent light emitting tubes to shorten restarting time.
CONSTITUTION: Two light emitting tubes 1a, 1b contained in an external tube 15 are secured via upper and lower retainers 6 to conductive supporting frame 4 connected with a leaf spring 5. One of main electrodes 2a, 2b of the tubes 1a, 1b is connected via lead wires 7, 9 to the frame 4, and the other of main electrodes 3a, 3b is connected to lead wires 8 and 10, and the frame 4 and wire 10 are connected to stem lead wires 11, 12 sealed with the stem 13. A rectangular partition wall plate 16 is disposed between the tubes 1a, 1b and secured at the upper and lower ends thereof to the retainer 6. The width size W of the retainer 6 is less than the outer diameter d of the tubes 1a, 1b and the length L is less than the total length l of the tubes 1a, 1b.
COPYRIGHT: (C)1979,JPO&Japio