Patent ID: 8167677

Claim:
A method of assembling an airtight LED light bulb comprising: connecting a stem device with an LED device, wherein the stem device is connected with the LED device having at least one LED and has a hollow base made of glass and having a first end; a second end opposite to the first end of the base; and a flange radially protruding from the second end of the base; two wires respectively mounted though the base, with each wire having a supporting end mounted outside and securely on the first end of the base and electrically connected securely with the LED device; and a connecting end adjacent to the flange; and a pipe made of glass, securely mounted in and protruding out from the base and having two opposite openings; drying the LED device; connecting the stem device with a bulb envelope, wherein the bulb envelope is hollow, is made of glass as a whole and has an end; and a neck formed at the end of the bulb envelope, abutting the flange and having an opening axially formed through the neck; the flange and the neck are melted by a flame of a torch with the bulb envelope and the stem device being simultaneously rotated with the flange and the neck seamlessly connected securely with each other; and one of the openings of the pipe is located outside the bulb envelope to communicate an inner space of the bulb envelope with the environment via the openings of the pipe; extracting air in the bulb envelope via the pipe; filling the bulb envelope with nitrogen or inert gas via the pipe; sealing the opening of the pipe which is located outside the bulb envelope to make the bulb envelope completely airtight; and connecting a cap with the bulb envelope, wherein the cap is mounted securely around the neck and is electrically connected with the connecting ends of the wires according to corresponding electrodes.