JPS61240556A - Small-type fluorescent lamp - Google Patents

Abstract

PURPOSE:To assure the coldest temperature without increasing the length of the exhaust tube by burying an exhaust tube protruding from an end of a bulb in a cup-like sealing body and inserting the sealing body in the hole of a base while the bottom of the sealing body is exposed outside. CONSTITUTION:A small-type fluorescent lamp is assembled by fusing electrodes 5 to the ends of a U-shaped bulb 1 the inner wall of which is coated with a phosphor 2 and by installing an exhaust tube 4 which protrudes from one of the ends and is supported by a base 7 having a terminal pin 6. A given amount of a filler 9 is packed in a cup-like sealing body 8 and the end 41 of an exhaust tube 4 which becomes the coldest area is buried in the packed filler 9. The exhaust tube 4 is fixed by inserting it into the hole of the base 7 while the bottom of the sealing body 8 is exposed outside. As a result, the exhaust tube 4 is efficiently cooled through the filler 9 and the coldest temperature is assured without increasing the length of the tube 4, thereby improving the efficiency of the lamp and reducing its size.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a low-pressure mercury vapor discharge lamp having a bulb bent so that both ends are closely opposed to each other. The present invention relates to a fluorescent lamp which is maintained at a constant temperature.

[Prior art]

In recent years, in order to reduce the size of fluorescent lamps, various lamps with bulbs bent into a U-shape have been devised. These lamps had the disadvantage that the mercury vapor pressure increased as the temperature of the tube wall of the lamp rose during lighting, resulting in a decrease in the ultraviolet excitation effect and a deterioration in luminous flux and efficiency. In order to improve this drawback, various methods have been proposed to maintain the mercury vapor pressure within the tube so that the ultraviolet excitation effect is maximized.

FIG. 2 shows an example of a double tube type fluorescent lamp shown in Japanese Utility Model Publication No. 13745/1983. A light dispersion material α2 is coated on the inner surface of a glass container α1 constituting this fluorescent lamp. The inner surface of the U-shaped bulb (3) is coated with a phosphor (2), and each end is provided with an electrode (5).
is established. At least one electrode (51 parts) of the U-shaped valve (1) has an exhaust pipe (
4) is installed so as to extend downward from the lighting device body a2 and is embedded in the lighting device body (13).

In the double tube type fluorescent lamp constructed in this way, the heat generated from the internal U-shaped knob (1) during lighting is disposed outside so as to wrap around the U-shaped bulb (1). Due to the presence of the glass container a0, the rate of heat being radiated and diffused into the outside air is reduced L, and the heat is trapped inside the glass container α1.J The temperature of the tube wall of the U-shaped bulb (1) increases. However, since at least one electrode (5) of the U-shaped bulb fxl has a long exhaust pipe structure, the temperature of the exhaust pipe female part ((11) does not easily rise.The water @ vapor pressure is the coldest point of the lamp. Since it is determined by temperature, the exhaust pipe (4) is made long and the end of the exhaust pipe (41) is brought to the temperature of the coldest point of the lamp to maintain the mercury vapor pressure inside the pipe so that the ultraviolet excitation effect is maximized. do.

Fig. 3 shows a lamp with a base (7) having a protrusion (71) for attachment attached to the end of the leg of the U-shaped bulb (11). One electrode (5) of the lamp 11 has a long exhaust pipe structure.In order to obtain a larger luminous flux in a smaller lamp with such a structure, when the tube current is increased, the temperature of the tube wall increases. However, since the exhaust pipe (4) is made long so that the exhaust pipe end (41) has the temperature at the coldest point of the lamp, the decrease in luminous flux and efficiency can be improved.

[Problem that the invention seeks to solve]

In the conventional method of maintaining mercury vapor pressure as described above,
If the lamp is to have a high output, it is necessary to further increase the protrusion distance H of the exhaust pipe (4) in order to form the optimum coldest part. Due to the lamp constructed as shown in FIG. 2, if the exhaust pipe (4) is further lengthened, it will interfere with proper arrangement of lighting components within the lighting device body. Furthermore, it becomes necessary to enlarge the lighting device body α trench to accommodate the elongated exhaust pipe (4), leading to an increase in cost. Also, in the lamp constructed as shown in FIG. 3, the protruding distance H of the exhaust pipe +41 is long, and the base (7) for housing the exhaust pipe +41 is large.

Not only does the compactness of the lamp suffer.

This will lead to an increase in costs. Additionally, there are many accidents where the exhaust pipe (4) breaks during lamp assembly due to its length (
The drawback was poor workability. The applicant has a cap (7
) Fill the inside of L with filler, exhaust pipe (4) and cap (7)
The exhaust pipe (4) is fixed to improve the cooling effect and is required.
I came up with the idea of shortening the length. However, with this method, the filler flows slightly, so the exhaust pipe (4)
Since the buried length cannot be made constant, the cooling effect will vary. In addition, the entrance of the lead wire (3) of the terminal pin (6) of the cap (7) is covered with the filler material, so that when the lead wire (31) is inserted into the terminal pin (6), the filler material adheres to the lead wire (3). Also, during assembly work, the filler material in the cap (7) may be accidentally attached to the lead wire (3), causing the L.
If the K filler adheres to the lead wire (3), it becomes difficult to solder it to the terminal pin (6), resulting in poor workability.

[Purpose of the invention]

This invention was made to solve this problem.Even when the F pump has a high output, the ultraviolet excitation effect caused by the increase in mercury vapor pressure σ caused by the rise in the tube wall temperature of the lamp during operation. Improves the decline in

Therefore, it provides a low-pressure mercury vapor discharge lamp that is compact and inexpensive (with improved workability).

[Means for solving problems]

A valve having an IT pole with an exhaust pipe protruding from at least one side, a valve bent so that both ends are close to each other, a cap attached to the end, and a transparent part at the bottom facing the exhaust pipe. A hole was drilled L, and a filling material was filled inside the cup-shaped closure L. The closure was inserted through the hole with the bottom exposed to the outside, and the exhaust pipe was buried in the filling material. It is something.

[Effect]

In this invention, the end of the exhaust pipe is buried in the filler filled inside the pot-shaped closure body, so that heat from the end of the exhaust pipe is transferred and released to suppress temperature rise. The cap-shaped closure body can be filled with a certain amount of filling material fC7'C, and the exhaust pipe can be reliably buried to a certain position. The pot-shaped closure filled with filler is a separate member from the cap, and is inserted into the through hole at the bottom of the cap after the lamp is assembled, so there is no need to solder the lead wire with the filler attached to the terminal pin of the cap. . .

Also, this pot-shaped closure is a separate component from the cap.

Materials and shapes can be selected with top priority given to functions that improve the cooling effect.

〔Example〕

FIG. 1 is a partially sectional front view of an embodiment of the present invention. In Fig. 1, (11 to (5)) are the same as the above conventional lamp. (7) is the lead wire of the electrode (5) (
3) is provided with a terminal pin (6) that is electrically connected to the cap, and a through hole is bored at the bottom of the cap at a location facing the exhaust pipe (4). (8) is a pot-shaped closure whose inside is filled with filler (9), and the bottom of the closure (8) is exposed to the outside and is inserted into the through hole at the bottom of the cap (7).
, the exhaust pipe (4) is buried in the filler (9).

In this embodiment, a U-shaped valve (11 has an outer diameter of 16.
A soda glass glass weighing 5 mg and having an inner diameter of 14.9 m was used, and its total height was 1900 mm. The exhaust pipe (4) formed at the end of the U-shaped valve (1) having one electrode (5) has an outer diameter of 5 m.

Using lead glass with an inner diameter of 4.4u, the protrusion distance ■ is 20
It was set as vrIL. The pot-shaped closure body (8) has an outer diameter of 11 m.

It was made of plastic and had an inner diameter of 9 m and a height of 7 m.

Silicone sealant KE45RTV manufactured by Shin-Etsu Chemical Co., Ltd. was used as the filler (9) for the pot-shaped closure (8). Then, 3 TOrr of Ar gas and a small amount of mercury were sealed inside this lamp.

In the lamp configured in this manner, the exhaust pipe (41) is made to protrude away from the electrode discharge path which is the heat source, so that the coldest part during lamp operation is ensured at the end of the exhaust pipe (4). (formed at 111). As the lamp output is increased, the amount of heat generated from the electrode (5) increases, so the temperature at the end (411), which is the coldest part, also rises. The heat of +11 is conducted to the outside of the bottom of the top-shaped closure (81) through the filling material (9) filled inside the top-shaped closure (81) to escape L, which is the coldest part. Pipe (4
) is suppressed from increasing the temperature at the end 011.

The lamp of the above example differs from the above example in that the pot-like closure (8) filled with the filler (9) inside is not removed.The lamp was lit with a 30W commercial ballast and the ambient temperature was 25°C. The temperature at the end (411) of the exhaust pipe (4) was measured when the end (411) of the exhaust pipe (4) of the lamp of the above example was measured.
The temperature of lamp No. 11 was 30° C. and 40° C. for the lamp containing the filler filled in the closing body (8). In these two lamps, the cooling effect due to the filler (9) is 10
It creates a difference in temperature. The optimum temperature for the coldest part of the lamp is approximately 40°C.
Therefore, it will be discussed that a lamp without a pot-like closure (8) has an optimum lamp efficiency. Whether the coldest point is higher or lower than 40°C, the efficiency decreases, but it can be seen that in the lamp of the above example, the coldest point does not reach the optimum value at an ambient temperature of 25°C. In the lamp of the above embodiment,
When the protrusion distance H of the exhaust pipe (4) was increased from 20m* to 14n, the temperature at the end of the exhaust pipe (4) became approximately 40°C. Therefore, the height h of the base (7) was increased by 6 The dragon can be made short.

It can be made more compact and costs can be reduced. Also, since the exhaust pipe (4) has been shortened, there are fewer accidents where it breaks during handling, and work efficiency has improved.

Furthermore, since the pot-shaped closure body (8) is used, a certain amount of filler (9) can be filled, and the exhaust pipe (4) can be reliably buried to a certain depth. Therefore, there is less filler material (9
) can increase the cooling effect and reduce the dispersion of the effect. In addition, if the filler (9) is filled inside the cap (7) without opening the pot-shaped closure (81), the filler (9) may flow slightly and the terminal pin (6) inside the cap (7) may flow. ) Cover the entrance of lead wire (3) and insert the lead wire (
When inserting the lead wire (3) into the terminal bin (6), the filler material (9) adheres to the lead wire (3). 2. During the assembly work, the filler material (9) often adhered to the lead wire (3).

When the filler (9) is attached to the lead wire (3), two caps (
Soldering the terminal pin (6) and the lead wire (3) in step 7) was difficult, and workability was extremely poor. Only L,
When assembling a pot-shaped closure (81).

First, connect the lead wire (3) to the terminal pin (6) inside the base (7).
After inserting L into the entrance and attaching the cap (7) to the lamp, solder the lead wire (3) and the terminal pin (6). Thereafter, a pot-shaped closure body (8) filled with a filler (9) inside.
) is inserted into the through hole at the bottom of the cap (7) with its bottom exposed to the outside, and the exhaust pipe (4) is buried in the filling material.

This is because the opportunity to solder the lead wire (3) to which the filler (9) is attached is removed during the work process.

Workability is significantly improved.

In addition, since the pot-shaped closure body (8) is made as a separate member from the cap (7), the material can be selected with priority given to the function of increasing the cooling effect. To enhance the cooling effect, use one cap (8
) is preferably made of a material 1 having excellent thermal conductivity, such as metal, but problems arise in that the terminal pins (6) are insulated from each other and the lead wire (3) in the cap (7) is insulated from the cap (7). In the above embodiment, the second cap (7) is made of plastic. However, since the pot-shaped closure body (81) is made as a separate member from the cap (7), it can be made of metal to easily solve the problem of insulation and improve the cooling effect.

Furthermore, by changing one dimension of the shape of the pot-like closure (8), the cooling effect can be finely adjusted. The thickness of the bottom of the blocker (81) has been reduced to improve the cooling effect, and the height of the blocker (8) has been changed to change the depth at which the exhaust pipe (4) is buried in the filler (9). You can

In the above embodiment, the case where there is one U-shaped bulb (1) was described, but a lamp in which two U-shaped bulbs < 11 are used to form a series of discharge paths, a double U-shaped lamp, etc. It has the same effect. Further, even when the lamp output is low, the same effect can be achieved. ! In this embodiment, the filler (9) is made of silicone resin, but it is not limited to silicone resin as long as it is thermally conductive and has adhesive strength.

〔Effect of the invention〕

As explained above, the present invention includes: a valve having an electrode with an exhaust pipe protruding from at least one side thereof and bent so that both ends thereof closely face each other; a cap attached to the end;
A through hole is drilled at the bottom of the L, facing the exhaust pipe.
On the other hand, the filling material was filled inside the cup-shaped closing body L, and the exhaust pipe was inserted into the through hole with the bottom exposed to the outside, and the exhaust pipe was buried in the filling material. This has the effect of not only improving the drop in pump efficiency but also shortening the length of the exhaust pipe, making the ':7 pump more compact and at lower cost.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of an embodiment of the present invention, FIG. 2 is a partially sectional front view of a conventional double tube fluorescent lamp, and FIG. 3 is a partially sectional front view of a conventional double tube fluorescent lamp. FIG. 2 is a front view showing a part of the character-shaped fluorescent lamp in cross section. In the figure, (1) is a U-shaped valve, and (3) is a lead wire. (4) is an exhaust pipe, (5) is an electrode, (6) is a terminal bin, (
7) is the base. (8) is a pot-shaped closure, and (9) is a filler. The same reference numerals in each 1 indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A valve bent so that both ends are closely opposed to each other; electrodes fixed to both ends of the valve, leading out lead wires to the outside, and having an exhaust pipe protruding from at least one end; an end of the valve; A cap is provided with an open end fixed to the cap and a terminal pin provided outwardly at the bottom to be electrically connected to the lead wire of the electrode, and the exhaust pipe is protruded into the interior of the cap. A through hole is bored at a location facing the L, and a filler is filled inside a cup-shaped closing body L, and the exhaust pipe is inserted into the through hole with the bottom of the closing body exposed to the outside. A compact fluorescent lamp characterized in that the exhaust pipe is buried within the filling material. (2) A compact fluorescent lamp according to claim 1, wherein the closing body is made of metal. (3) A small fluorescent lamp according to claim 1, wherein the filler is a silicone resin.