JPH05129007A - Structure of lamp base and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide the structure of a base of a lamp, which can restrict the generation of the soldering failure in a process for soldering a lead wire. CONSTITUTION:A lead wire 9 drawn to a top part of a base of a lamp is cut along the surface A extended at an angle against the axial direction of the lead wire 9. The tip part 9a of the lead wire 9 including the cut surface A is bent along a vertex 7a of an eyelet 7, and the tip 9a of the lead wire 9 is soldered 11 to the vertex part 7a of the eyelet 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp cap structure and a cap manufacturing method capable of suppressing the occurrence of defective soldering of a lead-in wire in a lamp cap top portion.

[0002]

2. Description of the Related Art In general, as shown in FIG. 4, a lead-in wire 31 of a stem is drawn out to a base 33 of a lamp base, which is cut by a cutter or the like, and then its tip 31a is placed along the top of an eyelet 35. A base structure is known in which the eyelet 35 is bent and the tip portion 31a thereof is soldered 37 to the top portion of the eyelet 35.

In the case of this type, when cutting the lead-in wire 31, the cutting is simply performed in a circular shape in a direction orthogonal to the axial direction of the lead-in wire 31.

By the way, since the above-mentioned die is manufactured through a number of heating steps, an oxide film is easily formed on the outer periphery of the tip 31a of the lead-in wire 31, and an oxide film is once formed on the outer periphery of the tip 31a. Then, in that state, solder 3
Even if 7, the normal conduction state cannot be obtained.
In this case, the cut surface B from which the oxide film is removed at the time of cutting is soldered 37.

[0005]

However, in the conventional structure, since the cutting surface B of the lead-in wire 31 is almost equal to the cross-sectional area thereof, the effective area of the soldering 37 is extremely small. However, there are problems such as insufficient soldering strength and spark melting failure due to contact resistance when the lamp is lit.

[0006] Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, and to prevent the occurrence of so-called soldering failure in the process of soldering the lead-in wire, and a lamp cap structure thereof. It is to provide a manufacturing method.

[0007]

In order to achieve the above object, the present invention cuts an introduction line drawn out to a base portion of a base of a lamp along a surface extending obliquely with respect to an axial direction of the introduction line. The tip of the lead wire including the cut surface is bent along the top of the eyelet, and the tip of the lead wire is soldered to the top of the eyelet.

According to another aspect of the invention, there is provided a process of drawing an introduction line into a top portion of a base of a lamp, and a process of cutting the drawn introduction line along a surface extending obliquely with respect to an axial direction of the introduction line, It is characterized by comprising a step of bending the tip of the lead wire including the cut surface along the top of the eyelet, and a step of soldering the tip of the lead wire to the top of the eyelet. ..

[0009]

According to the present invention, prior to soldering the tip of the lead-in wire drawn out to the base of the base to the top of the eyelet, the tip of the drawn-out lead-in wire is set in the axial direction of the lead-in wire. Since it cuts along a diagonally extending surface and forms a wide cutting surface at the tip, even if an oxide film is formed on the outer periphery of the tip, the oxide film is removed by cutting. Therefore, the conduction state of the soldering portion is improved, and the occurrence of defective soldering is suppressed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a lamp cap structure and a cap manufacturing method according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 2, reference numeral 1 denotes a part of the outer bulb of the lamp, and a stem 3 having an inner conductor 2 is fitted inside the neck portion 1a of the outer bulb 1.
As shown in FIG. 3, one end of the stem 3 is open, and a flared portion 3a having a divergent shape is formed on the opening side.
The flare portion 3a is welded to a part of the neck portion 1a of the outer ball 1. A screw portion is formed on the outer periphery of the neck portion 1a of the outer ball 1, and a brass shell 5 forming a base is screwed into the screw portion. An insulator 6 made of earthenware is fitted on the top of the shell 5, and an eyelet 7 made of brass is put on the top of the insulator 6.

Although not shown, an incandescent filament or an arc tube is connected to the outer end of the inner conductor 2 attached to the stem 3, and one of the inner conductors 2 is connected.
a is connected to a lead wire 8 made of a copper / nickel alloy, the lead wire 8 passes through the inside of the stem 3, and the neck portion 1a
It passes through the vertical groove of the threaded portion of the above and is led out to the outside from the gap between the outer ball 1 and the shell 5, and its tip portion 8 a is soldered to the outer wall of the shell 5.

The other conductor 2b of the inner conductors 2
Is connected to a lead wire 9 made of a copper / nickel alloy, the lead wire 9 passes through the inside of the stem 3, and the central hole 6a of the insulator 6
Through the center hole of the eyelet 7 and is led out to the outside.
Soldered to a.

FIG. 1 shows a main part of a mouthpiece structure according to this embodiment.

According to this, the tip portion 9a of the lead-in wire 9 led out to the outside through the central hole of the eyelet 7 is
Is cut along a plane A extending obliquely with respect to the axial direction, and the tip portion 9a including the cut plane A is bent along the top portion 7a of the eyelet 7 and then the top portion 7a.
It has been soldered to 11. Then, when the lamp is turned on, an electric current flows from the solder 11 to the filament through the lead-in wire 9.

According to this embodiment, however, an oxide film is likely to be formed on the outer periphery of the tip 9a of the lead-in wire 9 made of a copper-nickel alloy because many heating steps are performed in the lamp manufacturing process. Focusing on that, the tip 9
Prior to soldering a, a wide cutting surface A is to be formed at the tip 9a.

The wider the cut surface A is, the better it is, and any shape can be used for that purpose. However, the shape shown in the figure is optimal for processing the cut surface A at the same time when the lead wire 9 is cut. Is.

Since the cut surface A is formed at the tip portion 9a after the oxide film is formed so as to remove the oxide film, the oxide film may interfere with the process of soldering 11. In addition, it is possible to prevent the occurrence of so-called soldering failure such as insufficient soldering strength and spark melting failure due to contact resistance when the lamp is turned on, and it is possible to obtain an optimum conduction state.

In FIG. 1, the axis of the lead-in wire 9 and the cut surface A
The angle between and is θ = 15 °, but this angle is θ = 4
It is desirable to make it smaller than 5 °.

The tip 9a of the lead-in wire 9 has an angle θ = 15.
It has been found that so-called soldering defects are drastically reduced as a result of manufacturing lamps by cutting at °. Further, it has been found that the effective area A of the soldering 11 increases, so that the mechanical strength of the soldering 11, that is, the tensile strength between the lead-in wire 9 and the eyelet 7 is significantly improved.

Although the present invention has been described based on one embodiment, it is clear that the present invention is not limited to this, and the present invention is, for example, a fluorescent high pressure mercury lamp, a metal halide lamp, a high pressure sodium lamp. It can be applied to the base structure of any lamp, such as incandescent bulbs.

[0022]

As is apparent from the above description, according to the present invention, a wide cutting surface is formed at the tip of the lead-in wire before the tip of the lead-in wire is soldered. Even if an oxide film is formed on the substrate, the oxide film can be removed, so that the occurrence of so-called soldering failure can be drastically reduced.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a lamp cap structure according to the present invention.

FIG. 2 is a partial cross-sectional view showing a base of a lamp.

FIG. 3 is a cross-sectional view showing a stem.

FIG. 4 is a partial cross-sectional view showing a conventional lamp cap structure.

[Explanation of symbols]

 1 Outer sphere 3 Stem 5 Shell 6 Insulator 7 Eyelet 9 Introducing wire 9a Tip part A Surface extending obliquely to the axial direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sumio Kobayashi 1-1 Iriyama-cho, Gyoda-shi, Saitama Iwasaki Electric Co., Ltd. Saitama Factory

Claims (2)

[Claims] 1. A leading end portion of the lead-in wire, which is drawn out to the top portion of the base of the lamp, is cut along a surface extending obliquely with respect to the axial direction of the lead-in wire and including the cut surface. Is bent along the top of the eyelet, and the tip of the lead-in wire is soldered to the top of the eyelet. 2. A process of drawing out the lead-in wire to the top part of the base of the lamp, a step of cutting the drawn-out lead-in line along a surface extending obliquely with respect to the axial direction of the lead-in line, and this cutting. A method of manufacturing a lamp cap, comprising: a step of bending a leading end portion of a lead-in wire including a surface along a top portion of an eyelet; and a step of soldering the leading end portion of the lead-in wire to the top portion of the eyelet.