JPS61250956A - Bulb type fluorescent lamp - Google Patents

Abstract

PURPOSE:To facilitate manufacture while to improve the light emission efficiency of lamp by reducing the space between the open sections of lamp while extending the inner tube thus increasing the light emission area. CONSTITUTION:A tubular member 9 having a fluorescent material film 10 on the inner face is provided at the open sections 4, 4' of the inner tubes 3, 3' of bulb type fluorescent lamp. The tubular section 9 is jointed at one opening 4 through adhesive 11 such as low melting point glass or inorganic adhesive such that the discharge is never leaked through the jointing section. When adding a member 9 to the inner tube 3 and extending the discharge path, manufacture is facilitated while the light emission efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a self-ballasted fluorescent lamp with a separate inner tube, and particularly to a lamp suitable for increasing the luminous flux of a self-ballasted fluorescent lamp with a separate inner tube. Regarding structure.

[Background of the invention]

The conventional bulb-shaped fluorescent lamp with separate inner tube shown in FIG. 1 includes a flare stem 1 and two hot cathodes 2. 2' (one not shown).

One end S surrounds the hot cathode 2, 2' and is sealed and fixed to the flare stem 1, and the other end has an opening 4, 4' near the flare stem, and has a phosphor film 5 on the inner surface. .5'
(one not shown) a bent inner tube 3, 3';
An outer tube 6 surrounds the inner tubes 3 and 3' and is sealed and fixed to the flare stem 1, and the outer tube 6 contains several tens of mg of mercury (not shown) and several Torr of inert gas. This is a low-pressure steam discharge lamp (hereinafter referred to as a self-ballasted fluorescent lamp) formed by enclosing a light bulb (not shown).

In a compact fluorescent lamp with this structure, a tungsten wire is wound into a coil, and inside the coil are two hot cathodes 2 coated with barium oxide or the like to have a low work function and facilitate the emission of electrons. A low-pressure mercury vapor discharge occurs between 2' and 2' (not shown). The low-pressure mercury vapor discharge mentioned above (
Hereinafter, it will be abbreviated as discharge. ) exits from the hot cathode 2 from inside the inner tube 3 having the phosphor film 5 on its inner surface, through the opening 4 and into the outer tube 6, and further from the opening 4' with the phosphor film 5 on its inner surface. It passes through an inner tube 3' having a diameter of 5' and is formed in the path of the hot cathode 2'. formed in the discharge path described above. plasma 7
The ultraviolet rays generated from mercury vapor inside the inner tube 3.3
The light is converted into visible light by the phosphor films 5, 5' coated on the inner surface.

A feature of the compact fluorescent lamp with this structure is that the space inside the inner tube 3゜3', which has the phosphor films 5 and 5' which are the light emitting parts, is continuous with the space inside the outer tube 6. Therefore, the amount of ultraviolet light that affects the luminous efficiency of the lamp, and the mercury vapor pressure in the plasma 7 in the inner tube 3゜3' that affects the amount of ultraviolet light, are determined by the temperature of the coldest part of the outer tube 6. The point is that there is.

Therefore.

A high-output fluorescent lamp and a cover were installed on the outer tube.

In compact lamps, the reduction in luminous efficiency of the lamp due to an excessive rise in the temperature of the coldest part, which is a problem, is alleviated.

However, in the structure of the above-mentioned light bulb-shaped fluorescent lamp,
Plasma 7 formed in the space between the two inner tubes 3, 3'
The problem is that they do not contribute to light emission and emit ineffective ultraviolet rays, resulting in loss, and no consideration has been given to this point.

In addition, the plasma 7 formed between the inner tubes 3 and 3' mentioned above
In order to reduce the loss of ultraviolet rays generated from the inner tube 8, as shown in FIG.
, 8' to reduce the amount of plasma 7 between the openings 4.degree. 4', and further increase the area of the phosphor films 5, 5' within the inner tube 8.degree. 8' to increase the amount of light emitted. However, the structure of this inner tube 8° 8' is difficult to manufacture three-dimensionally bent at once, and the phosphor film 5.
5', it is difficult to uniformly apply the phosphor films 5, 5.
' has the disadvantage of causing a decrease in luminous efficiency due to cracks, unevenness, etc.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a compact fluorescent lamp with improved lamp luminous efficiency and high luminous flux.

[Summary of the invention]

In order to achieve the above object, the present invention includes a flare stem, two hot cathodes provided on the flare stem, and a flare stem surrounding the two hot cathodes.

One end is adhesively fixed to the flare stem, the other end is opened near the flare stem, and the bent inner tube has a phosphor film on the inner surface, and the outer tube surrounds the inner tube and is sealed and fixed to the flare stem. In a compact fluorescent lamp comprising a tube and an inert gas filled with mercury in the outer tube, in order to reduce the space between the openings and extend the inner tube to increase the light emitting area,
By providing a glass connection member made of the same material as the inner tube with a phosphor film on the inner surface in the space between the yR openings, and providing an opening at the end or in the middle, manufacturing is easy.
In addition, the lamp luminous efficiency is improved and a compact fluorescent lamp with high luminous flux can be obtained.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

3, 4, and 5 show that according to the present invention, the openings 4, 4' of the inner tubes 3, 3' of the compact fluorescent lamp shown in FIG. 1 are provided with a phosphor film 10 on the inner surface. FIG. 3 is a partial view showing a tubular member 9 provided therein. The tubular member 9 is connected at one opening 4 with an adhesive 11 such as low-melting point glass or an inorganic adhesive so that there is no discharge leakage at the bonded portion. In this way, the member 9 is added to the inner tube 3 later to adjust the discharge path length (
Abbreviation for effective discharge path length that includes a phosphor film and contributes to light emission.

) can make it easier to manufacture the inner tube and apply the phosphor, compared to manufacturing the inner tube with a complicated shape as shown in FIG. 2 in advance.

The rate of increase in luminous efficiency of the lamp by adding such a member 9 varies depending on the length of the inner tubes 3, 3' and the shape and dimensions of the member 9 extending the discharge path length.
If the inner tubes 3, 3' shown in the figure have a total length of 260 mm and an inner diameter of 12 m, and the length of the extension member 9 of the inner tubes 3, 3' is 40 m and the inner diameter is 101111 as shown in FIG. 4, the luminous efficiency will increase. The rate was approximately 8%. Furthermore, this value is about 1% higher than the luminous efficiency in the case of the lamp having the structure shown in FIG. 2 and the same discharge path length. This is because the lamp provided with the discharge path extension member 9 has less uneven coating of the phosphor.

According to this embodiment, since the inner tube 3 and the member 9 are fitted and bonded together, a high-performance compact fluorescent lamp with high mechanical strength and easy manufacture can be realized.

That is, according to this embodiment, the length of the discharge path can be easily reduced, so that the luminous efficiency of the lamp can be improved and a high luminous flux can be obtained.

Furthermore, as shown in FIGS. 3, 4, and 5, a member 9 is used to confine the plasma 7 between the openings 4 and 4' of the inner tubes 3 and 3', and to prevent the plasma from entering the outer tube 6. This prevents
At the same time as the efficiency is improved, the emission color of the plasma 7 and the coloring of the outer tube 6 due to the plasma 7 can be eliminated at the same time, which has the effect of improving the appearance.

Next, another embodiment according to the present invention will be described with reference to FIGS. 6 to 11.

6, 7, and 8 show the effective discharge path (
Abbreviation for the length of the discharge path that includes a phosphor film and contributes to light emission. ) is a partial view of an opening in which an extension member 9 is arranged. The structure shown in FIG. 2 is a plan in which the inner tube is bent three-dimensionally to extend the effective discharge path, but compared to this plan, the method of arranging the member 9 is different from the method of manufacturing the member and Formation of the phosphor can be facilitated. By fitting the member 9 and one open end 4 together and fixing the entire circumference with adhesive 11, the shape of the other end of the member 9 is adjusted to increase adhesive strength and prevent leakage of discharge. As shown in FIGS. 10 and 11, the inner tube 3 and the member 9 are shaped so that there is a gap between them, and only the part where they fit together is fixed with an adhesive 11'. By doing this, the discharge space and the space inside the outer tube 6 are communicated,
This is done without sacrificing the characteristics of a compact fluorescent lamp.

By arranging the member 9 in the openings 4°4' of the inner tubes 3, 3', the increase in the luminous efficiency of the lamp is as follows.
, 3 and the shape and dimensions of the member 9 extending the discharge path length, for example.

The contents 3 and 3' shown in Figure 1 are 260 m in total length and 12 m in inner diameter.
5+, and the length of the extension member 9 of the inner tubes 3, 3' is 40 m,
In the case of the structure shown in FIG. 7 in which the inner diameter was reduced to 10 cm, the rate of increase in luminous efficiency was about 8%. This is also compared to the luminous efficiency when the discharge path length is the same in a lamp having the structure shown in FIG.

The value is about 1% thicker. This is due to the fact that the lamp provided with the discharge path extension member 9 has less uneven coating of the phosphor.

According to this embodiment, since both ends of the member 9 are fixed with adhesive, the mechanical strength is strong, and since one end of the member 9 is partially adhesively bonded, it is easy to manufacture and has high performance. A compact fluorescent lamp can be realized. That is, according to this embodiment, the length of the discharge path can be easily increased, so that the luminous efficiency of the lamp can be improved and a high luminous flux can be obtained.

Furthermore, by arranging the member 9 as shown in FIG. 6, FIG. 7, and FIG. Since leakage is prevented, efficiency is improved, and at the same time, the emission color of the plasma 7 and the coloring of the outer tube due to the plasma 7 can be eliminated.
It has the effect of improving appearance.

Next, still another embodiment of the present invention will be described with reference to FIGS. 12 to 15.

12, 13, 12-15 show the inner tube 3 of the conventional compact fluorescent lamp shown in FIG.
FIG. 3 is a partial view showing a tubular member 9 having a phosphor film 10 on its inner surface and having one hole 12 in addition to both ends arranged in the openings 4 and 4' of the tube 3'. Both ends of the tubular member 9 are connected to the openings 4 and 4' of the inner tube 3゜3' using adhesives 11 and 11' such as inorganic adhesives to prevent leakage of electrical discharge. There is. In this way, later on the inner tubes 3 and 3',
A method of adding a member 9 and providing a phosphor film to extend the effective discharge path length (hereinafter abbreviated as discharge path length) contributing to light emission is to extend the space inside the plasma 7 and the space inside the outer bulb 6. Producing a hole 12 for communication when molding the member 9;
The former method is easier than manufacturing the complicated three-dimensionally bent inner tubes 8, 8' shown in FIG. Furthermore, considering the coating of the phosphor, the present invention is much easier to manufacture than the plan shown in FIG.

The rate of increase in luminous efficiency of the lamp due to the addition of such a member 9 varies depending on the length of the inner tubes 3, 3' and the shape and size of the member 9 extending the discharge path length.

- By way of example, the total length of the inner tubes 3, 3' shown in FIG.
When the structure shown in FIG. 6 was adopted in which the length of the discharge path length extension member 9 was 40 m and the inner diameter was 12 m, the rate of increase in luminous efficiency was about 10%. Furthermore, this value is about 1% larger than the luminous efficiency in the case of the lamp having the structure shown in FIG. 2 and the same discharge path length. This is because the lamp provided with the discharge path extension member 9 has less uneven coating of the phosphor.

According to this embodiment, since both ends of the member 9 are adhesively fixed, a high-performance self-ballasted fluorescent lamp with strong mechanical strength and a simple manufacturing method can be realized.

That is, according to this embodiment, since the discharge path can be easily extended, the luminous efficiency of the lamp can be improved and a high luminous flux can be obtained.

Furthermore, as shown in FIGS. 12, 13, 14, and 15, one member 9 is used to open the openings 4 and 4 of the inner tube 3°3'.
Since the plasma 7 is confined between the outer tube 6 and the outer tube 6, efficiency is improved, and at the same time, the color of the plasma emitted by the plasma and the coloring of the outer tube 6 due to the plasma 7 can be eliminated, improving the appearance. It has the effect of

〔Effect of the invention〕

As described above, according to the present invention, the length of the discharge path can be easily increased, so that the luminous efficiency of the lamp can be improved and a high luminous flux can be obtained.

[Brief explanation of the drawing]

Figure 1 is a structural diagram of a conventional internal bulb-type fluorescent lamp (1
FIG. 2 is a partial view of an improvement of a conventional self-ballasted fluorescent lamp with separate inner tubes, and FIGS. 3 to 15 are partial views of a self-ballasted fluorescent lamp according to the present invention. 1... Flare stem, 2, 2'... Hot cathode, 3, 3
'...Inner tube, 4.4'...Opening, 5,5', 1
0... Phosphor film, 6... Outer tube, 7... Plasma,
8.8'... Inner tube of improvement plan, 9... Discharge path extension member, 11... Adhesive. 12...Opening.

Claims (1)

[Claims] 1. A flare stem, two hot cathodes provided on the flare stem, each surrounding the two hot cathodes, one end sealed and fixed to the flare stem, and the other end opened near the flare stem. two bent inner tubes having a phosphor film on their inner surfaces; an outer tube surrounding the two inner tubes and sealed and fixed to the flare stem; and mercury in the outer tube. In a bulb-shaped fluorescent lamp with a separate inner tube filled with an inert gas, a tubular connecting member having a phosphor film on the inner surface is provided between the ends of the two inner tubes that open near the flare stem. , and a light bulb-shaped fluorescent lamp characterized in that an opening is provided at an end or in the middle of the connecting member.