JPH04106863A - Single-ended sealing type electric lamp and manufacture thereof - Google Patents

Abstract

PURPOSE:To secure the path area of a predetermined size so as to enable a high exhaust efficiency to be maintained, by making the cross-section of an exhaust path into a flat form. CONSTITUTION:A press-flattened sealing portion 2 is formed at the end portion of a glass valve 1 accommodating a filament 3 and hermetically pierced by a pair of copper-weld wires 4, which are connected to the filament 3. And then an exhaust path 10 is formed in the press-flattened sealing portion 2 along the direction of a valve axis, and the cross-section of the exhaust path 10 is made into a flat form, whereby the path area of a predetermined size may be secured without any special convex portion being formed on the flattened surface of the press-flattened sealing portion 2, and at the time of exhausting and gas-filling of the valve 1, the gas flow is smooth since a path resistance is small, so that the exhaust efficiency may be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a single-sealed (wedge base) light bulb.

(Prior art) Single-sealed incandescent light bulbs used in various meters and single-sealed halogen light bulbs used in automobile headlights have a crushed seal at one end. It has a structure in which the crushing seal part is directly supported by the socket, and it is a mouthless mold.

A conventional single-sealed π-sphere will be explained based on FIGS. 7 to 9.

In the figure, 1 is a bulb, which is made of transparent soft glass. One end of this valve 1 is closed, and a crush sealing portion 2 is formed at the other end.

A filament 3 is housed inside the bulb 1,
Both ends of this filament 30 are connected to wells 4.4. These wells 44 are supported in the middle by bridge glass 5 and are hermetically penetrated by the crush sealing portion 2 . The wells 4, 4 guided to the outside of the crushing sealing part 2 are bent and placed along the outer surface of the crushing sealing part 2 to form a terminal 6.6.

An inert gas is sealed inside such a valve 1.

An exhaust pipe 7 is welded to the crush sealing portion 2, and an exhaust passage 8 is formed inside the exhaust pipe 7.

The exhaust pipe 7 is welded at the same time when the open end of the valve 1 is crushed to form the crushed sealing part 2.
It is used to exhaust the inside of the valve 1 through the internal exhaust passage 8 and to fill it with inert gas. When such evacuation is completed, the tip of the exhaust pipe 7 is sealed and sealed.

(Problem to be Solved by the Invention) In order to maintain high exhaust efficiency, the diameter of the exhaust passage 8 used for the above-mentioned exhaust work needs to be a certain size, and therefore the diameter of the exhaust pipe 7 is set to a predetermined size. I was using one. Therefore, as shown in FIG. 8, the exhaust pipe 7 has a diameter d larger than the thickness t of the crush sealing part 2, and a part of the exhaust pipe 7 protrudes from the crushing surface of the crush sealing part 2 to form a protrusion 9. was formed.

However, recently, a socket having a structure in which the convex portion 9 as described above cannot be received on the side of the socket that receives the crushing sealing portion 2 has come out.

For this reason, it is not possible to provide a protrusion on the crushing surface of the crush sealing part 2, and even if a convexity is formed, the amount of protrusion is limited to a very small amount.

The thickness t of the crushed sealing part is about 3 parts at most, and if an exhaust pipe that does not protrude more than this is used, the diameter d of the exhaust pipe 7 is 31II11 or less, and the size of the exhaust passage 8 is As shown in FIG. 9, it becomes extremely small.

For this reason, there is a problem that gas flow resistance increases during exhausting work, and exhaust efficiency decreases.

The present invention was made based on the above circumstances, and its first object is to ensure a large passage area of the exhaust passage without forming a protruding part on the crushing surface of the crushing sealing part.
The purpose of the present invention is to provide a single-sealed light bulb that can maintain high exhaust efficiency.

The second objective is to provide a manufacturing method that allows the above-mentioned light bulb to be easily manufactured.

[Structure of the Invention] (Means for Solving the Problems) The first aspect of the present invention is to form a crushed sealing portion at the end of a glass bulb containing a filament, and to airtightly fit a pair of wells in the crushed sealing portion. In the single-sealed light bulb, the wells are connected to the filament, and an exhaust passage is formed in the crushed sealing part, and the surface of the crushing sealing part is made substantially flat. It is characterized by having a flat cross-sectional shape.

The second aspect of the present invention is to insert a glass exhaust pipe into the bulb through an opening formed at one end of the glass bulb, and insert a filament installed between a pair of wells, so that the opening end of the bulb and By heating and softening the exhaust pipe and crushing this open end, a crushed sealing part is formed at the end of the valve, a pair of wells are sealed to this crushed sealing part, and the exhaust pipe is welded. In the method for manufacturing a single-sealed light bulb, the exhaust pipe is a glass tube whose tube shape and exhaust passage are previously formed into a flat shape.

The third aspect of the present invention is to insert a glass exhaust pipe into the bulb through an opening formed at one end of the glass bulb, and insert a filament installed between a pair of wells, so that the open end of the bulb and the filament are inserted between the pair of wells. A collapsed sealing portion is formed at the end of the valve by heating and softening the exhaust pipe and crushing the open end thereof, and a pair of wells are sealed to the crushing sealing portion, and the exhaust pipe is In the manufacturing method of a single-sealed light bulb, the exhaust pipe uses a glass tube whose diameter is larger than the thickness of the crushed sealing part, and the exhaust pipe is crushed at the same time as the bulb end is crushed. The passage is characterized by a flat cross-sectional shape.

(Function) According to the first aspect of the present invention, since the cross-sectional shape of the exhaust passage is made into a flat shape, it is possible to secure a passage area of a predetermined size without forming a convex part on the crushing surface of the crushing sealing part. I can,
It is possible to maintain high exhaust efficiency.

According to the second aspect of the present invention, a glass tube whose tube shape and exhaust passage are previously formed into a flat shape is used as the exhaust pipe, so that the flat shape of the exhaust passage can be reliably obtained.

According to the third aspect of the present invention, a glass tube having a diameter larger than the thickness of the crush sealing portion is used as the exhaust pipe, and the cross-sectional shape of the exhaust passage is flattened by crushing the valve end at the same time. , conventional methods can be used.

(Example) The present invention will be described below based on an example shown in FIGS. 1 and 2.

FIG. 1 shows the single-sealed halogen light bulb of this embodiment, and the seventh
Components similar to the conventional ones shown in FIG. 8 and FIG. 8 will be described with the same reference numerals.

That is, 1 is a bulb made of soft glass, and 2 is a bulb made of soft glass.
3 is a filament made of a tungsten coil, 4 is a well made of molybdenum, etc., which is connected to a Dumet wire or nickel wire (not shown), and an external conductor led to the outside. It constitutes the terminal 6.6. 5 is the bridge glass.

An exhaust passage 10 is formed in the crush sealing portion 2 along the valve axis direction, and the exhaust passage 10 has a flat cross-sectional shape as shown in FIG.

If the exhaust passage 10 has such a flat shape, it is possible to secure a passage area of a predetermined size without forming an extraordinary convex part on the crushing surface of the crushing sealing part 2.

Therefore, when the valve 1 is evacuated or filled with gas, there is little passage resistance, so the gas flow is smooth and the exhaust efficiency is high.

Therefore, it is particularly effective for wedge base type light bulbs in which the thickness t of the crush sealing portion 2 is regulated.

Next, an example of a method for manufacturing the single-sealed halogen light bulb having the above structure will be explained based on FIGS. 3 and 4.

The glass bulb 1 shown in FIG. 3 has an open end 1a with an unsealed end. This bulb 1
In this step, the glass exhaust pipe 11 is inserted from the open end 1a, and the filament 3 which is installed between the pair of wells 4.4 is inserted.

In this case, the exhaust pipe 11 has a pipe shape and an exhaust passage 1
A glass tube in which 0 is pre-shaped into a flat shape is used. Note that a blocking prevention plate 12 made of a flat metal plate is inserted into the exhaust passage 1o so that this passage is not blocked.

The filament 3 and the exhaust pipe 11 are positioned at predetermined positions of the open end 1a of the valve 1, and the open end 1a of the valve 1 and the exhaust pipe 11 are heated with a gas burner or the like (not shown).

When these are softened, the open end 1a of the valve 1 is crushed using a pressing tool (not shown) to crush and seal.

As a result, a crushed sealing portion 2 is formed, and this crushing sealing portion 2
A pair of wells 4.4 are sealed to the exhaust pipe 1.
1 is welded. The glass of the exhaust pipe 11 is fused to the glass of the crush sealing part 2 and becomes substantially integrated.

When the blocking prevention plate 12 is pulled out in this state, a flat exhaust passage 10 is formed in the crushing sealing part 2.

Therefore, the single-sealed halogen light bulb having the configuration shown in FIG. 1 can be easily manufactured.

Next, an example of another manufacturing method will be described based on FIGS. 5 and 6.

This method utilizes a conventional method, and uses a glass tube with a circular cross section, the diameter of which is larger than the thickness of the crush seal 2, as the exhaust pipe 20.

The exhaust pipe 20 is inserted from the open end 1a of the valve 1, and the filament 3 which is installed between the pair of wells 4.4 is inserted.

The filament 3 and the exhaust pipe 11 are positioned at predetermined positions of the open end 1a of the valve 1, and the open end 1a of the valve 1 and the exhaust pipe 11 are heated with a gas burner or the like (not shown).

Once these have softened, the open end 1a of the valve 1 is crushed and sealed using a pressing tool (not shown).

At this time, the exhaust pipe 20 is also crushed together. However, the amount of crushing of the exhaust pipe 20 is limited to the thickness t of the crushing sealing part 2.

Such pressing forms a crushed sealing portion 2, a pair of wells 4.4 are sealed to this crushing sealing portion 2, and the crushed exhaust pipe 20 is welded.

The exhaust pipe 20 is fused to the crushing sealing part 2 and becomes substantially integral with it.

Since the exhaust pipe 20 is also crushed by such crushing,
A circular exhaust passage 21 formed inside the exhaust pipe 20
is transformed into a flat exhaust passage 10 as shown in FIG.

Even in this manner, the single-sealed halogen light bulb having the configuration shown in FIG. 1 can be easily manufactured.

In this case, conventional crush sealing methods and exhaust pipes can be used.

Note that the present invention is not limited to the above embodiments.

That is, in the above embodiment, the case of a single-sealed halogen light bulb has been described, but the present invention is not limited to a halogen light bulb, and may be a single-sealed incandescent light bulb made of hard glass or quartz glass.

[Effects of the Invention] As explained above, according to the first aspect of the present invention, the cross-sectional shape of the exhaust passage is made into a flat shape, so that a predetermined size can be achieved without forming a convex part on the crushing surface of the crushing sealing part. It is possible to secure a passage area of

According to the second aspect of the present invention, a glass tube whose pipe shape and exhaust passage are previously formed into a flat shape is used as the exhaust pipe, so that the flat shape of the exhaust passage can be reliably obtained.

Furthermore, according to the third aspect of the present invention, a glass tube whose diameter is larger than the thickness of the crush sealing part is used as the exhaust pipe, and by crushing the valve end at the same time, the cross-sectional shape of the exhaust passage is flattened. It can be done. In this case, conventional methods and conventional sized exhaust pipes can also be used.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a perspective view of a single-sealed halogen light bulb, FIG. 2 is a cross-sectional view of its crushing seal, and FIGS. Figure 4 shows one example of the manufacturing method, Figure 3 is an exploded perspective view, Figure 4 is a sectional view of the crushing seal, and Figures 5 and 6 show other examples of the manufacturing method. FIG. 5 is an exploded perspective view, FIG. 6 is a sectional view of the crushing sealing part, and FIG. 7 and subsequent figures show a conventional single-sealed halogen light bulb.
... Crushing sealing part, 3... Filament, 4... Well, 10... Exhaust passage, 11.20... Exhaust pipe. Applicant's Representative Patent Attorney Takehiko Suzue

Claims (3)

[Claims] (1) A crushing seal is formed at the end of the glass bulb containing the filament, a pair of wells are hermetically penetrated through the crushing seal, these wells are connected to the filament, and the crushing seal is What is claimed is: 1. A single-sealed light bulb in which an exhaust passage is formed in the section and the surface of the crushed sealing section is a substantially flat surface, characterized in that the exhaust passage has a flat cross-sectional shape. (2) Insert a glass exhaust pipe into the bulb through the opening formed at one end of the glass bulb, and insert a filament installed between a pair of wells to heat the open end of the bulb and the exhaust pipe. By softening and crushing this opening end, a crushed sealing part is formed at the end of the valve, and a pair of wells are sealed to this crushing sealing part,
and a method for manufacturing a single-sealed light bulb in which the exhaust pipe is welded, wherein the exhaust pipe is a glass tube whose tube shape and exhaust passage are previously formed into a flat shape. A method of manufacturing shaped light bulbs. (3) Insert a glass exhaust pipe into the bulb through the opening formed at one end of the glass bulb, and insert the filament installed between the pair of wells to heat the open end of the bulb and the exhaust pipe. By softening and crushing this opening end, a crushed sealing part is formed at the end of the valve, and a pair of wells are sealed to this crushing sealing part,
And in the method for manufacturing a single-sealed light bulb in which the exhaust pipe is welded, the exhaust pipe is made of a glass tube whose diameter is larger than the thickness of the crushed sealing part, and the glass tube is pressed at the same time when the end of the bulb is crushed. A method for producing a single-sealed light bulb, characterized by flattening the cross-sectional shape of the exhaust passage by crushing the bulb.