Glass LED bulb and method of production
A light device comprising a light emitting diode (LED) enclosed in a glass tube is described. The first closed end of the glass tube has a tapered cross section with a conical shape and a ball at the tip. The second closed end of the glass tube has a melted region encasing a pair of lead wires that pass into the lumen of the glass tube and connect to the LED.
1. A light device comprising:
a glass lumen having a longitudinal dimension, a first closed end, and a second closed end;
a light emitting diode (LED) comprising an anode and a cathode enclosed in a plastic casing, a first lead wire coupled with the anode and extending out from the plastic casing, and a second lead wire coupled with the cathode and extending out from the plastic casing; and
wherein the plastic casing is disposed inside the glass lumen and the first lead wire and the second lead wire are disposed in a melted region of the first closed end of the glass lumen and extend outside of the glass lumen.
2. The light device of claim 1 , wherein the second closed end has a tapered cross section the ends at a sphere.
3. The light device of claim 2 , wherein the sphere is formed by heating and pressing an open end of a glass tube.
4. The light device of claim 1 , wherein the first closed end is formed by heating and pressing an open end of a glass tube while the first and second lead wires are disposed through the open end.
5. The light device of claim 1 , wherein the glass lumen is formed by heating open ends of a glass tube.
6. The light device of claim 5 , wherein the glass tube is heated using fire or electric heating.
7. The light device of claim 1 , wherein the glass lumen has a diameter in the range of 4.0 and 6.0 mm.
8. The light device of claim 7 , wherein the glass lumen has a wall thickness in the range of 0.3 to 1.0 mm.
9. The light device of claim 1 , wherein the LED has a diameter in the range of 3.5 to 5.5 mm.