Patent ID: 8568185

Claim:
A manufacturing method of a dual external electrode fluorescent lamp characterized by comprising: (i) a step of providing a 1 st glass tube that has both ends opened thereof and an inner wall thereof coated with a fluorescent material, wherein the diameter of the opened ends is extended; (ii) a step of mutually connecting the 1 st glass tube with two 2 nd glass tubes by joining both opened ends of the 1 st glass tube to the two both-end opened 2 nd glass tubes that include opened ends thereof and have a diameter larger than that of the 1 st glass tube; (iii) a step of joining a 1 st multi-tube for the enlargement of an electrode area in one of the 2 nd glass tubes or a flare structure having one closed end to one end of the one 2 nd glass tubes through insertion after spreading the one end of the 2 nd glass tube widely, and a step of enlarging an electrode area in the other 2 nd tube and joining a 2 nd multi-tube having an exhaust port to the other 2 nd glass tube through insertion; and (iv) a step of cutting and sealing a portion of the exhaust port after vacuumizing 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.