Abstract: A dual external electrode fluorescent lamp and manufacturing method thereof comprising a 1st glass tube with both ends open and an inner wall optionally coated with a fluorescent material, wherein the diameter of the opened ends is extended; connecting the 1st glass tube with two 2nd glass tubes by joining both opened ends of the 1st glass tube to the two both-end opened 2nd glass tubes that have a diameter larger than that of the 1st glass tube; joining a 1st multi-tube for the enlargement of an electrode area in the one 2nd glass tube or a ‘flare’ structure having one closed end to one end of 2nd glass tube through insertion after spreading one end widely, and enlarging an electrode area in the other 2nd tube and joining a 2nd multi-tube having an exhaust port to the other 2nd tube through insertion; cutting and sealing a portion of the exhaust port after vacuuming the inside of the glass tubes and injecting discharge gas inside the glass tubes through the connection of an exhaust system to the exhaust port

Abstract: A new dual external electrode fluorescent lamp and a manufacturing method provides a manufacturing method of a dual external electrode fluorescent lamp comprising: (i) a step of providing a 1st glass tube that has both ends opened thereof and an inner wall thereof coated or not coated with a fluorescent material, wherein the diameter of the opened ends is extended; (ii) a step of mutually connecting the 1st glass tube with two 2nd glass tubes by joining both opened ends of the 1st glass tube to the two both-end opened 2nd glass tubes that include opened ends thereof and have a diameter larger than that of the 1st glass tube; (iii) a step of joining 1st multi-tube for the enlargement of an electrode area in the one 2nd glass tube or a ‘flare’ structure having one closed end to one end of one 2nd glass tube through insertion after spreading one end widely, and a step of enlarging an electrode area in the other 2nd tube and joining a 2nd multi-tube having an exhaust port to the other 2nd tube through insertion;