JPS62274528A - Manufacture of mount for bulb type fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a crack starting from a spot where an inner wall of an inner tube in a pinch sealing part of a mount creeps into the melted part with an acute angle by providing a process to apply pressure to the inside surface of the inner tube from the open end of the inner tube with gas after pinch sealing. CONSTITUTION:While the sealing part of a pinch-sealed mount is still in a softened state, inside pressure of inner tube 1 is raised by blowinggas 13 from a nozzle 10 into an open end of the inner tube 1 for widening the inner wall of the inner tube at the base 9 of the inner tube 1 in the softened state to enlarge the angle theta deg.. One of the methods to vaise the inside pressure of the inner tube 1 is utilization of dynamic pressure. Thereby, the softened part only is deformed for widening the spot where the inner tube of pinch sealing part of the mount creeps into the melted part with an acute angle, so that the occurrence of a crack can be prevented.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of manufacturing a self-ballasted fluorescent lamp, and particularly to a method of manufacturing a mount for this type of lamp.

[Conventional technology]

The conventional method of manufacturing a mount for a compact fluorescent lamp was published in Japanese Patent Application Laid-Open No. 5
Flare as described in Publication No. 8-216334.

The inner pipe, exhaust pipe, and lead-in wire are set, heated and softened with a burner, and pinch-sealed using suppression pieces that enter from the left and right directions. Since the inner tube is fused from both sides in a crushed state, the inner wall of the inner tube in this part eliminates acute angles and sinks into the fused portion. For this reason, there was a drawback that cracks were more likely to occur at the base of the acute angle portion. It is possible to suppress the occurrence of cracks by increasing the angle at the base, but this point was not taken into consideration.

[Problem that the invention seeks to solve]

The above-described method for manufacturing a mount for a compact fluorescent lamp does not take into consideration the shape of the root portion of the inner tube, and has the disadvantage that cracks are likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a mount for a self-ballasted fluorescent lamp, which eliminates the above-mentioned drawbacks.

Means to solve problem c] The above purposes are for flares, exhaust pipes, inner pipes, and lead-in lines.

After heating and softening the filament mount components together with a burner around the outside of the flare body and pinching them together, while the fused portion of the inner tube is in a softened state, use gas from the open end of the inner tube to This can be achieved by applying pressure to the inner surface of the tube, pushing the inner wall of the inner tube which has sunk in at an acute angle, and widening the angle to avoid cracks.

[Effect]

The gas blown into the inner tube from the nozzle is converted from dynamic pressure to static pressure inside the inner tube and acts as internal pressure.
Only the softened part deforms. As a result, the portion where the inner tube of the pinch sealing portion of the mount sinks into the fused portion at an acute angle is pushed out, thereby preventing the occurrence of cracks.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, and 5.

FIG. 3 shows a basic configuration diagram of a mount for a self-ballasted fluorescent lamp manufactured by the manufacturing method according to the present invention. FIG. 2 is a diagram illustrating the arrangement of mount components before being formed into a mount. As shown in FIG. 2, in the previous step, the two lead-in wires 4 are fixed in advance with a metal wire 6, and in that state, the two sets of electrodes with the filament 2 connected thereto and the exhaust pipe 5 are inserted into the flare 3. Let me insert it.

Insert and set the inner tube 1 from above centering each filament 2. In this state, rotate around the exhaust pipe 5,
The flare 3, inner pipe 1, exhaust pipe 5, and lead-in wire 4 are heated and softened with a burner 8, and pinch-sealed with a pressing piece 7 that enters from the left and right directions. As a result, the metal conductor lead-in wire 4, the glass inner tube 1, the flare 3, and the exhaust pipe 5 are fused together. Furthermore, when the metal wire 6 between the lead-in wires 4 is cut at the lead-in B4 at a position where the metal wire can be removed, the mount shown in FIG. 3 can be obtained. FIG. 1 is a diagram showing a method of inflating the inner wall of the inner tube of the pinch sealing portion in the mount manufacturing process, which is a feature of the present invention. While the pinch-sealed sealing part of the mount shown in FIG. 3 is in a softened state, gas 13 is blown from the nozzle 10 through the open end 12 of the inner tube 1 to increase the pressure inside the inner tube 1 and soften it. The inner wall of the inner tube at the base 9 of a certain inner tube 1 is pushed and expanded to increase the angle θ°.

As a method of increasing the pressure inside the inner tube 1, as shown in FIG. 1, there is a method of using dynamic pressure, and as shown in FIG.
Any method that utilizes static pressure by bringing the nozzle 10 into close contact with the surface may be used.

FIG. 5 is a basic configuration diagram of a compact fluorescent lamp manufactured using the mount manufacturing method of the present invention.

In this case, an outer bulb 11 having a light diffusing film formed on its inner surface is sealed to the collar of a flare 3 of a mount having an inner 4g1 having a fluorescent film formed on its inner surface.

〔Effect of the invention〕

According to the present invention, it is possible to prevent the occurrence of cracks starting from the point where the inner wall of the inner tube of the pinch sealing part of the mount forms an acute angle and sinks into the fused part, so that it is possible to prevent cracks from occurring in the pinch sealing part of the mount. The effect is that it can be easily manufactured.

[Brief explanation of drawings]

Figure 1 is a basic configuration diagram showing the method of inflating the inner wall of the circular tube of the pinch sealing part in the mount manufacturing process, Figure 2 is a diagram of the component arrangement pattern before forming the mount, and Figure 3 is the book. FIG. 4, a basic configuration diagram of a mount for a compact fluorescent lamp manufactured by the manufacturing method according to the invention, is another example of a method for inflating the inner wall of the inner tube of the pinch sealing portion. FIG. 5 is a basic configuration diagram of a compact fluorescent lamp. 1.1'...Inner tube, 2...Filament, 3...
Flare, 4... Lead-in wire, 5... Exhaust pipe, 6... Metal wire, 7... Suppression piece, 8... Burner, 9... Root of inner tube, 10... Nozzle , 11... outer pipe valve, 1
2.12'...Open end of inner tube, bow l Figure 1.1'・Inner basket/,? , /2'``'藺0 10, IO'...Nos° Figure 2

Claims (1)

[Claims] 1. In the manufacturing process of the mount consisting of the flare, inner pipe, exhaust pipe, lead-in wire and filament, after pinch sealing,
A method for manufacturing a mount for a self-ballasted fluorescent lamp, characterized in that the mount is manufactured by providing a step of applying pressure to the inner surface of the inner tube with gas from the open end side of the inner tube.