JPS5828711B2 - How to make light bulbs - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a light bulb.

Small light bulbs used in automobile lights, display devices, etc.
It is manufactured by inserting a bead mount into a valve, heating the valve from the outside while evacuating the inside of the valve, and welding and sealing it to the bead.

If the bead mount moves during manufacturing, the filament will not be in the correct position and may cause eccentricity.
It is required that the bead mount be fixed.

For this reason, after positioning the bead mount inserted into the valve, the part of the valve to be welded is heated to temporarily fix a part to the bead, thereby maintaining the proper position of the bead mount while maintaining the gap between the valve and the bead. There is a method of exhausting the gas using a gas pump, and then reheating the valve afterwards to completely weld it to the bead.

According to this method, since the bead mount is temporarily fixed to the valve, it is possible to prevent the bead mount from shifting in the subsequent exhaust process and welding sealing process. The ratio of the gap between the bead and the bead is not constant, which may impede the exhaust process in some cases.

The present invention provides a tightening method to prevent such inconvenience from occurring, in which when temporarily fixing a bead mound, it is held down with a pincher provided with a protrusion, and the valve part corresponding to the protrusion is fixed to the bead. The purpose is to temporarily fix the bead mount in a constant state and ensure complete evacuation work.

Next, the present invention will be explained in more detail based on the illustrated embodiment. Reference numeral 1 is a valve that is placed with its opening facing upward, and a bead mount 3 suspended by a magnet 2 is inserted into this valve and is placed in a predetermined position. determined in position.

Then, the outer periphery of the bulb 1 corresponding to the bead 3a is heated with a burner 4, and a pincher 5 is pressed against it to weld a part of the bead 3aK of the bulb, thereby temporarily fixing the bead mount 3.

As shown in FIG. 3, the pinchers 5 are provided with protrusions 5b at symmetrical positions on a curved surface 5a at the tip, and press the outer wall of the bulb 1, which has been heated and softened as described above, from both sides by pinching it. At this time, the valve portion 1a corresponding to the projection 5b is welded to the bead 3a.

Fig. 5 shows a pincher 5' consisting of three chuck-like pieces, each piece having a protrusion 5'b formed on its inner curved surface 5'a. Then, as shown in FIG. 6, there are three valve portions 1a that are welded to the bead 3a, corresponding to the number of protrusions 5'b.

After the bead mount 3 is temporarily fixed to the valve 1 in this way, the valve 1 is inserted into the exhaust rubber pipe 6 as shown in FIG. A light bulb is manufactured by completely welding a bulb 1 and a bead 3a.

During this evacuation, the filament 3b of the bead mount 3
The tip of the valve 1 where the bead 3a and the valve 1 are located
The exhaust gas is completely exhausted from the gap S between the valve 1 and the bead 3a, and since the bead 3a is temporarily fixed to the valve 1, the position of the bead 3a will not shift.

As a result, tilting and thin shafts of the filament are prevented, improving the quality of the light bulb and minimizing the occurrence of defective products during manufacturing.

As explained above, the present invention involves inserting and positioning a bead mount into a bulb, then welding a part of the bulb to the bead to fix the bead mount, and then performing an evacuation and sealing process. In this method, when temporarily fixing the valve and the bead, a pincher with a protrusion is used to fix the valve part corresponding to the protrusion to the bead, so there is no possibility of variations in the fixed state. It can be fixed securely without any problems.

Therefore, the gap between the valve and the bead in the portion where h is fixed becomes almost constant, which is convenient for the subsequent exhaust process, and moreover, its reliability can be guaranteed.

Further, since the bulb is pressed and shaped by the curved surface of the pincher during temporary fixing, the sealing operation during complete welding becomes easier and the appearance can be finished neatly.

[Brief explanation of the drawing]

Figure 1 A and C are explanatory diagrams showing the manufacturing method of the light bulb in the order of steps, Figure 2 is an enlarged cross-sectional view of part A in Figure 1, and Figure 3 shows the main parts of the pincher according to the present invention. 4 is a cross-sectional view of the temporary fixing part, FIG. 5 is a plan view of the main parts of another pincher, and FIG. 6 is a cross-sectional view of the temporary fixing part when using the pincher. 1... Valve, 2... Magnet, 3
...Bead mount, 4...Burner, 5...Pincher-5a...Curved surface,
5b...Protrusion, 6...Rubber pipe for exhaust.

Claims (1)

[Claims] 1. In a light bulb manufacturing method in which a bead mount is inserted and positioned in a bulb, the welded part of the bulb is heated to temporarily fix the bulb and bead, and then an exhaust and weld sealing process is performed, the bulb and bead are 1. A method of manufacturing a light bulb, characterized in that when temporarily fixing the light bulb, a pincher provided with a protrusion is applied and the light bulb is fixed to a bead of the bulb portion corresponding to the protrusion.