JPH03250559A - Incandescent lamp with dimple and its manufacturing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a dimpled incandescent light bulb, which comprises forming a recess in a tube-shaped bulb and fixing a ring anchor in position in the recess.

[Conventional technology]

Incandescent light bulbs, which are made by arranging a filament along the axis of a straight tube-shaped pulp, are widely used in a variety of fields such as light sources for lighting and heat sources for heaters. It has the structure shown. That is, a filament 2 is disposed between crimp sealing parts 11 formed at both ends of the tubular bulb 1, and ring anchors 21 are installed at several locations to hold the filament 2 along the axis of the tubular bulb 1. attached. Note that 4 is a metal foil embedded in the crimp-sealed portion 11, and 5 is an external lead-in line for electricity supply.

Incandescent light bulbs configured in this way do not have a structure that proactively prevents the filament from expanding or contracting in the direction of the tube axis, so the filament may expand or contract due to vibration or may sag when lit vertically, causing premature damage. There were many problems in that the wire could break.

Therefore, as shown in FIG. 6, a recess or dimple 13 is formed in the pipe-type valve 1 so as to sandwich the ring anchor 2l.
By forming and fixing the position, the filament 2 is prevented from moving in the tube axis direction.
The applicant of the present invention has also previously developed an effective means for forming the dimples 13 and proposed it in Japanese Patent Application No. 61-224786. In this invention, the axis of the pipe valve and the flame of the gas burner are arranged in a three-dimensional intersecting relationship, and dimples are formed by heating the outer surface of the pipe valve with the outer flame of the flame. This makes it possible to form the groove as deep as necessary.

[Problem to be solved by the invention]

With the dimple forming method proposed in the above-mentioned Japanese Patent Application No. 61-224786, subsequent research has revealed that the dimples may not be formed to the required depth, and in such cases, the gas burner may not be brought too close to the It turns out that all you have to do is drill a hole in the valve. When we investigated the reason for this, we found that the depth of the dimples that are formed becomes extremely shallow when the internal pressure of the pipe valve that reduces the pressure to form the dimples exceeds a certain value.

And the dimple is for one ring anchor,
Since they are usually formed in two locations facing each other, it is necessary to heat them with a gas burner at least twice. During the second heating, the temperature inside the bulb rises and the internal pressure becomes too high. It was also discovered that there was a need to cool it down.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing an incandescent light bulb with dimples, which allows dimples of a required depth to be formed continuously over time and always at a constant level.

[Means to solve the problem]

In order to achieve the above object, the method for manufacturing an incandescent light bulb with a timple according to the present invention comprises a filament disposed inside a tube-shaped bulb and a ring anchor that holds the filament along the axis of the tube-shaped bulb. Hold both ends of the tube-type incandescent bulb, place the axis of the gas burner's flame at a three-dimensional intersection with the tube-type bulb, and heat the outer surface of the tube-type bulb near the ring anchor with the exceptional flame of the flame. a first step of forming one dimple by inverting the tube-type incandescent light bulb; a second step of inverting the tube-type incandescent light bulb and similarly forming the other dimple at a position opposite to one dimple; The gas filling pressure at room temperature is 60 cmHg or less.

[Effect]

The tip of the flame will change its position significantly if the gas pressure changes even slightly, and the lateral flame will hardly change, so if the tube type valve is the same type, work with the burner and tube valve fixed in position. As a result, the bulb can be heated at a constant temperature, and the gas filling pressure of the tube-type incandescent lamp at room temperature is 60 CmHg or less. Even if they are formed continuously, the depth can be kept almost constant.

〔Example〕

The details of the present invention will be specifically explained below based on the drawings.

FIGS. 1(A) to 1(C) are explanatory diagrams of the manufacturing process of the present invention, in which (A) is when one dimple has started to be formed, and (B) is when one dimple has been formed. At the end of the process,
(c) shows the state at the end of the second step when the other dimple has been formed. That is, in the present invention, as shown in FIG. 2, the flame 31 blown out from the burner 30 and the tube-shaped valve 1 are placed at a position where they intersect with each other, and the exceptional flame 33 of the flame 31 and the outer surface of the tube-shaped pulp 1 are connected to each other. touch or be close to each other. Then, the side part of the ring anchor 21 is heated to form one dimple 14 (first step),
Turn the tubular incandescent light bulb upside down and heat the side of the ring anchor 21 in the same way to form the other dimple 15 (
2nd step).

As the heating gas, for example, a gas containing a mixture of oxygen and hydrogen at a ratio of 2.1% is used, and the discharge pressure is 1.1%. The gas released at OKg/a+f is ignited and a flame 31 is formed. At this time, if the discharge pressure changes even slightly, the length of the flame 31 changes significantly, but even if the length of the flame 31 changes, the position of the exceptional flame 33 of the flame 31 hardly changes. As long as the pressure changes, the temperature change of the lateral flame 33 of the flame 31 is also small. Therefore, if the bone mass pulp l and the position of the burner 30 are set constant, the tube wall valve l
The outer surface 15 of is always placed in a constant positional relationship with the outer flame 33 of the flame 31 and heated at a constant temperature.

In addition, as shown in FIG. 1(a), when dimples begin to be formed on the tube wall bulb 1, the lateral flame 33 of the flame 31 is in a positional relationship such that it is in contact with the tube wall bulb l; When the wall bulb 1 is heated and a recess is formed on the side of the ring anchor 21, as shown in FIGS. 1(B) and 1(C),
Exceptions to the flame 31 A gap C is formed between the flame 33 and the concave portion of the tube wall valve l, that is, the dimples 14 and 15, and when this gap C reaches a certain value, the dimples 14 and 15 will no longer advance deeper. . Therefore, no time control is required in forming the dimples 14 and 15.

FIG. 3 is a diagram showing the relationship between the gas filling pressure and the depth of the dimples formed when the dimples 14 and 15 are formed by intersecting the tube wall valve l and the flame 31. The tube wall bulb 1 used was a quartz glass tube with an inner diameter of 8 mm and a wall thickness of 1 mm, the burner used a gas having the above-mentioned composition, and was arranged so that the outer flame 33 of the flame 31 was in contact with the surface of the tube wall bulb 1. The maximum temperature at which the tube wall valve can be heated is 23
It is 00°C. As can be seen from this figure, when the gas filling pressure is set to 70 cmHg or less, the depth of the dimples formed hardly changes. and 70
When the gas filling pressure is set to more than cmHg, the dimples formed rapidly become shallower, and at 73 cmHg, the dimples are formed only about half as deep.

Figure 4 illustrates the difference between the depth of the dimples formed in the first step and the depth of the dimples formed in the second step when the gas filling pressure of the pipe wall valve l at room temperature is changed. However, when the sealing pressure at room temperature is 66 cmHg, the dimple depth is about 1 mm shallower.

This is because in the first step, dimples with a predetermined depth are formed, but in the second step, the internal pressure is 70 cmH.
This is because if it exceeds g, the dimples formed will become shallow. And the gas filling pressure at room temperature is 60 cmHg.
pl, the internal pressure will be 70 cm in the second step as well.
Hg or more, and the difference in the depth of the formed dimples can be made 0.5 [11 m or less]. Note that even if the sealing pressure at room temperature is set to 56 cmHg or less, the depth of the dimples formed is not affected for the same reason.

According to the above embodiment, the gas burner is arranged so that the axis of the flame 31 intersects with the bone pulp l and the lateral flame 33 is in contact with the surface of the tube wall valve l, so that the tube wall valve l is almost constant. heated at a temperature of

Then, the sealing pressure of the pipe wall valve 1 at room temperature is set to 60 cm (g).
Since the dimples 14 and 15 formed in the first step and the second step can have a substantially constant depth, the dimples 14 and 15 can be formed in the following manner.

〔Effect of the invention〕

As explained above, according to the method for manufacturing an incandescent light bulb with dimples of the present invention, dimples can be formed deeply, and even if dimples are formed facing each other in succession over time, the depth can be reduced. Since it is possible to maintain a nearly constant value, the incandescent bulb will not come off the ring anchor or dimple, making it suitable for incandescent bulbs that are subject to gravity in the direction of the tube axis of tube wall bulbs, and heaters that are lit vertically. can.

[Brief explanation of drawings]

Figures 1 (a) to (c) are before and after forming dimples.
An explanatory diagram showing the process and the state at the end of the second process, Fig. 2 is an explanatory diagram showing the positional relationship between the tube wall valve and the burner flame when forming dimples, and Fig. 3 is an explanatory diagram showing the gas filling pressure and the state at the end of the second process. Figure 4 is a diagram showing the relationship between the gas filling pressure and the difference in the depth of the dimples formed on one side and the other side, Figure 5 is an explanatory diagram of a tube-type incandescent light bulb. ,
FIG. 6 is an explanatory diagram showing a state in which a ring anchor is fixed in position by a conventional dimple. ■・-・Pipe wall valve 13・-・Dimple l1l
-・Dimple 15 on one side・・Dimple 2 on the other side・
・-Filament 21...Ring anchor 30
-・-Burner 31 Flame 33...Lateral flame C gap Figure Figure 1 Figure Figure Penetration pressure (cmHg) Figure Figure

Claims (1)

[Claims] Holds both ends of a tube-type incandescent light bulb consisting of a filament placed inside the tube-type bulb and a ring anchor that holds this filament along the axis of the tube-type bulb, and connects the gas burner to the tube-type bulb. A first step of arranging the axes of the flames in a three-dimensionally intersecting position and heating the outer surface of the tube-shaped bulb near the ring anchor with the outer flame of the flame to form one dimple; and a second step of inverting and forming the other dimple at a position facing one dimple, the dimpled incandescent lamp having a gas filling pressure of 60 cmHg or less at room temperature. How to make an incandescent light bulb.