JPS63257178A - Compact type fluorescent lamp - Google Patents

Abstract

PURPOSE:To decrease the number of manufacturing processes and to make stable manufacture in quality possible by providing stems with a pair of electrodes which are sealed with frit glass at the end parts of two U-shaped glass tubes. CONSTITUTION:There are provided a cap-shaped connecting metal 19 with double bottoms to be a communication hole which forms a discharge path connecting the end parts on a side of two U-shaped glass tubes 17, and stems 21 with a pair of electrodes which are sealed with frit glass 18c at the end parts on the other side of two U-shaped glass tubes 17. Connection metals 19 are sealed with frit glass to the end parts of a side of two U-shaped glass tubes placed in parallel and at the end parts of the other side stems 21 are sealed also with frit glass, in doing so the sealing of opening ports of glass tubes 17 can be finished by one process. As for the connection metal 19, a cheap metal part such as one made by press working of a sheet metal can be used, which helps to bring about the cost-cut of a fluorescent lamp. A fluorescent screen 16 is formed on the inside surface of the two U-shaped glass tubes 17 and then these two tubes are connected into a double U shape by connection metals 19, so that the film quality of the fluorescent screen of the two U-shaped glass tubes 17 is stabilized and the formation of the fluorescent screen 16 on the inside surface of U-shaped tubes is done easily and in good quality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact fluorescent lamp in which two U-shaped glass tubes are connected to form a double U-shaped discharge path.

Conventional technology Compact fluorescent lamps that form a double U-shaped discharge path are about the same size as incandescent light bulbs, and consume significantly less power than incandescent light bulbs of the same brightness. It is becoming popular as an alternative in various lighting fields. The following (a) are common in this compact fluorescent lamp.
There are products manufactured through the steps of ~(d).

(a) A fluorescent film is formed on the inner surface of a U-shaped glass tube obtained by bending a straight glass tube into a U-shape.

(b) Seal the stem with an electrode at one end of the U-shaped glass tube of step (a) and the stem without electrode at the other end.

(C), 2 of the U-shaped glass tube with the stem sealed in step (b)
A book is prepared, these two U-shaped glass tubes are placed side by side in parallel, and the opposing portions of the ends without electrodes are locally heated with a gas burner and welded into a tube shape.

(B) Attach a base with a cap pin to the end of the double U-shaped glass tube obtained in step (C).

The compact fluorescent lamp obtained in steps (a) to (d) is easy to manufacture, but it is difficult to manufacture the compact fluorescent lamp in step (C), in which two U-shaped glass tubes are connected by local heating. The heat deteriorates the fluorescent film previously formed on the inner surface of the U-shaped glass tube, making it easier to peel off from the glass tube. Furthermore, in order to reduce peeling of the fluorescent film from the glass tube, it is necessary to form the fluorescent film on the inner surface of the glass tube using a large amount of binder. Therefore, the manufactured compact fluorescent lamps had the disadvantage that the V quality of the fluorescent film was poor due to deterioration due to a large amount of binder and heat, and sufficient brightness could not be obtained.

Therefore, in order to eliminate the above-mentioned drawbacks, after connecting two U-shaped glass tubes into a double U-shape, a fluorescent film is formed on the inner surface of this double U-shaped glass tube, and the four open ends of the double U-shaped glass tube are A system in which the part is sealed with a stem using a ceramic substrate has been put into practical use. Examples thereof will be explained with reference to FIGS. 16 and 17, and manufacturing process examples will be explained with reference to FIGS. 18 to 23.

The compact fluorescent lamps shown in FIGS. 16 and 17 are manufactured as follows. First, a large number of U-shaped glass tubes (1) shown in FIG. 18 are prepared. This U-shaped glass tube (1)
Although not shown, the central part of a straight glass tube is locally heated, the central part is bent into a U-shape, the bent central part is further heated and softened, and molded into a roughly H-shape. It has been formatted. Next, as shown in FIG.
The open ends of the U-shaped glass tubes (1) (1) are aligned and placed in parallel, and the opposing ends (la) (la) of the two U-shaped glass tubes (1) (1) are facing each other. The part is locally heated from the inside with a gas burner (not shown) to swell and weld it into a tubular shape, and the welded tubular connection part (2) connects the two U-shaped glasses ff (1) (1) with a double U. Connected and integrated in a letter shape,
One double U-shaped glass tube (3) is obtained.

Next, as shown in Figure 20, double U-shaped glass tubes (3
) Pour and apply the phosphor suspension onto the inner surface of the
A fluorescent film (4) is formed by firing. The four open ends (la) of the double U-shaped glass tube (3) of this fluorescent film (4)
(la) (lb) The one formed in (1b) is
It is selectively removed with a brush, etc.

Next, corresponding to the double U-shaped glass tube (3), four glass stems (6a) (6a) (6b) are placed on the ceramic substrate (5), as shown in Figures 21 and 22.
(6b) is prepared by holding it upright with a frit glass (7) interposed therebetween. The ceramic substrate (5) is a rectangular plate-shaped thing that closes the four open ends of the double U-shaped glass tube (3), and has through holes (8) (8) at four locations on the bottom surface.
A frit glass (7) is applied onto this bottom surface, and two stems with electrodes (6a) (6a) and stems (6b) with electrodes (6b) are placed on top of the frit glass (7) of each exhaust pipe (9).
) (9) -1- and stem with electrode (6b) (6b)
Lead wire extending from only (10) (10)...
are inserted into the corresponding through-holes (8), (8), and are erected and held. In addition, (11) (11) is the stem with electrode (6b) (6b) +7)+7-)' line (10
) (10)-(7) An electrode connected to the tip.

Next, four (D stem (6a) (6a) (6b
) (6b) and connect the open end of the double U-shaped glass tube (3) with the connecting part (2) of the double U-shaped glass tube (3), as shown in FIG. Insert the stem without electrode (6a) (6a) into the two open ends (la) (la), and insert the stem (6b) with a T pole into the remaining two open ends Db) (lb).
(6b) is pressed while being inserted, and the whole is passed through a heating furnace (not shown) to heat and melt the frit glass (7). Then, the molten frit glass (7)
are the four open ends (la) of the double U-shaped glass tube (3)
(la) (lb) (lb) with 4 stems (6
a) (6a) (6b) (6b) are sealed at the same time. Before exhausting, all but the designated exhaust pipes are melted and blocked. After this, the double U-shaped glass tube (3) is exhausted, and the exhaust pipe (9) protruding from the ceramic substrate (5) is sealed off. , four cap pins (12) shown in chain lines in FIGS. 16 and 17 are attached to the ceramic substrate (5).
) and - is covered and fixed. The lead wire (10) is attached to the cap pin (12) (12)
), (10)...- are connected.

The compact fluorescent lamp manufactured as described above has two
A fluorescent film is formed on the double U-shaped glass tube after the book U-shaped glass tubes are connected into a double U-shape, so there is less deterioration of the fluorescent film due to heat, and this fluorescent film is attached to the glass tube. It has been found that even when formed with less binder, it is less likely to peel off from the glass tube and, therefore, a brighter fluorescent lamp can be obtained. Furthermore, stem sealing of the four open ends of the double U-shaped glass tube can be performed simultaneously by using a ceramic substrate, which has the advantage of reducing the number of manufacturing steps.

However, in the above-mentioned compact fluorescent lamp, the ceramic substrate used to simultaneously seal the four stems at the four open ends of the double U-shaped glass tube is expensive.
This makes it difficult to reduce the cost of compact fluorescent lamps. In addition, since the double U-shaped glass tube, which is made by connecting two U-shaped glass tubes, has a complicated double U shape, a phosphor suspension is applied to the inner surface of the double U-shaped glass tube in a uniform thickness and then dried. There was a problem that the work was difficult and the workability of the fluorescent film forming process was poor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an inexpensive compact fluorescent lamp that can be manufactured with fewer manufacturing steps and with stable quality.

Therefore, in order to achieve the above object, the present invention has two U-shaped glass tubes with openings at both ends having a fluorescent film on the inner surface, and two U-shaped glass tubes installed in parallel. Two opposing ends of the wooden U-shaped glass tubes are sealed with frit glass and serve as communication holes that connect the -63 parts of the two U-shaped glass tubes to form a discharge path. A cap-shaped connecting fitting with a heavy bottom structure,
The present invention is characterized in that each of the two U-shaped glass tubes is provided with a pair of oval stems sealed with frit glass.

The opening end of the glass tube can be sealed in one step by sealing the connecting fitting on one end of each of the two U-shaped glass tubes and the stem on the other end with frit glass. Can be implemented. In addition, inexpensive connecting fittings such as press-molded metal plates can be used, making it possible to reduce the cost of the fluorescent lamp. Furthermore, since a fluorescent film is formed on the inner surface of the two U-shaped glass tubes and these two are connected in a double U shape using a connecting fitting, the fluorescent film of the two U-shaped glass tubes has stable film quality. In addition, the formation of a fluorescent film on the inner surface of the U-shaped glass tube can be easily and efficiently performed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 13.

Compact fluorescent lamps (15
) consists of two U-shaped glass tubes (17) (17) of the same size with fluorescent films (16) (16) on their inner surfaces, and two wedge-shaped glass tubes (17) placed side by side with their open ends aligned.
(17) Each opposing end (17a) (17a
) with a frit glass (18a), and two U-shaped glass tubes (19).
7) Each remaining end (17b) (17b) of (17)
) and sealed with a frit glass (18b).

The connecting fittings (19) are two U-shaped glass tubes (17) (17
) with a double-bottomed structure having a communication hole (20) at the bottom that closes each one end (17a, ) (17a) and connects each one end (17a) (17a) to form a discharge path. Specifically, it is composed of an inner cap (22) and an outer cap (23) as shown in FIG. Both caps (22) and (23) are press-molded from metal plates such as nickel-plated iron plates, and the inner cap (22) is connected to two U-shaped glass tubes (17).
(17) Each opposing end (17a) (17a
) Oval-shaped dish-shaped cap body (22a)
and one end (17a) of each of the two rectangular glass tubes (17) at both ends of the bottom of the cap body (22a).
(17a) has convex portions (22b) (22b) which are bulged in the portion facing the open end of each convex portion (22b).
b) A pair of window holes (24) in opposite parts of the side wall of (22b)
(24) is drilled. The outer cap (23) is an oval-shaped dish that is airtightly fixed to the periphery of the lower surface of the bottom plate of the inner cap (22) with brazing or the like, and the outer cap (23) is fixed to the inner cap (22) and integrated. to form one connecting fitting (19). A communication hole (20) is formed at the bottom of the connecting fitting (19), surrounded by the bottom plates of the inner cap (22) and the outer cap (23), and having window holes (24) at both ends.

A pair of metal stems (21) (21) have the same shape, and one of them is shown in Fig. 6. The stem (21) is disc-shaped and has a U-shaped glass tube (17) on its periphery. - Frontage end (
17b), a central hole (27) into which one exhaust pipe (26) is glass-sealed, and two lead wires (27) on both sides of the central hole (27). 2B) (28
) is inserted into the lead sealing hole (29) and sealed with glass.
(29).

Attach the exhaust pipe (26) and lead cotton (28) to the stem (21).
After glass-sealing 28), a pair of lead wires (28)
An electrode (30) is connected to the inner end of (28), and this stem (21) with electrode is attached to two U-shaped glass tubes (17) together with a connecting fitting (19) as shown in the description. are sealed at the same time.

Next, an example of the process for making the cap of the compact fluorescent lamp (15) will be explained with reference to FIGS. 7 to 13.

First, a U-shaped glass tube (17) shown in FIG. 7 is obtained. This U-shaped glass tube (17) may be made by, for example, bending a straight glass tube into a U-shape, and molding the bent portion at the center. Next, as shown in Figure 8, the U-shaped glass tube (17)
A fluorescent film (16) is formed on the inner surface of the U-shaped glass tube (17).
), selectively remove only the fluorescent film (16) on the inner surfaces of both ends (17a) and (17b). U-shaped glass like this? The formation of the fluorescent film (16) on (17) is a double U
Compared to forming a fluorescent film on the inner surface of a shaped glass tube, it is easier to form a film with a uniform thickness and to achieve mass production.

Next, as shown in FIGS. 9 to 11, the jig (31)
At the upper fixed position, connect the connecting fitting (19) and a stem with a pair of electrodes (
21) Position and supply (21). for example,
The jig (31) has an oval-shaped connecting fitting holding recess (3) on the top surface.
2) and a pair of stem holding recesses (33) (33), and a connecting fitting (19) is attached to the inner cap (32) in the recess (32).
It is stored with the other recesses (33) (3
3) to stem (21) (21) to electric 1 (30)
It is inserted and held with (30) facing up. Frit glass (18a) is coated on the bottom surface of the inner cap (22) of this connecting fitting (19), and each stem (21) (
Frit glass (18b) is applied to the stepped portion (25) (21).

On the other hand, two U-shaped glass tubes with fluorescent films formed (17)
(17) are placed side by side at regular intervals with their end faces aligned and held, and the opposing ends (17a) (17a) of the two U-shaped glass tubes (17) are fixed with a jig ( 1
3) Insert the upper connecting fitting (19) onto the inner cap (22), and attach the remaining ends (17b) (17b) to the jig (3).
1) Insert onto the periphery of the corresponding stem (21) (21) on the top. The entire structure is then passed through a heating furnace (not shown) to heat and melt the frit glasses (18a) and (18b). Then, as shown in FIGS. 12 and 13, the frit glass (18a) of the connecting fitting (19)
seals each one end (17a) (17a) of the two U-shaped glass tubes (17) (17) and the inner cap (22), thereby sealing the two U-shaped glass tubes (17) (
17), each one end (17a) (17,8) is connected to a connecting fitting (
19) are connected in a communicating state through the communication hole (20) to form a double U-shaped glass tube. On the other hand, the other ends (17b) (17b) of the two U-shaped glass tubes (17) (17)
), a pair of electrode-attached stems (21) (21) are simultaneously sealed with frit glasses (18b) (18b).

After that, exhaust treatment is performed on the double U-shaped glass tube in which the two U-shaped glass tubes (17) (17) are connected, and the exhaust pipes (26) (26) extending from the stem (21) (21) are
) is sealed, then four cap bottles (
34) The pace (35) having (34)- is fixed, and the corresponding lead wires (28) (28)- are connected to the base pins (34) (34).

The connecting fitting (19) that connects the two U-shaped glass tubes (17) (17) in the above compact fluorescent lamp (15) is composed of two flat inner caps (22) and an outer cap (23). This makes it possible to reduce the thickness of each of the two U-shaped glass tubes (17) (17).
) The communication hole (20) communicating with (17a) has the shortest length, which is effective in improving the luminous efficiency of the fluorescent lamp. Furthermore, the pair of stems sealed at each one end (17b) (17b) of the two wooden glass tubes (17) (17) is not limited to being made of metal; for example, a pair of stems made of glass (36) shown in FIG. ).

An exhaust pipe (26') is connected to this glass stem (36), a pair of lead wires (28°) (28°) are penetrated and sealed, and electrodes are connected to the lead wires (28°) (28°). (3
0") is connected. The peripheral edge of the stem (36) is inserted into the open end (17b) of the U-shaped glass tube (17) and welded with frit glass (18c), but this stem sealing In order to do this easily and reliably, use a ring-shaped metal cap (37) and perform the following procedure.As shown in Figure 15, insert the hole (
38) to the exhaust pipe (26') and lead wire (28') (2
8°), cut the stem (36) through the flint glass (18c) onto the metal cap (37), and place one pair of metal caps (37) on the jig (31°). It is supplied to the position together with the connecting fitting (19) and held. Thus, a connecting fitting (19) and a pair of metal caps (37)
(37) and two U-shaped glass tubes (17) from directly above.
(17), press the open end of the flint glass (18a) (18c), and pass the whole thing into the heating furnace.
) is melted.

Effects of the Invention As described above, according to the present invention, there is provided a connecting fitting that connects two U-shaped glass tubes to form a double U-shaped discharge path, and an electrode encapsulation of the two U-shaped glass tubes. Sealed at the side end. It is possible to simultaneously seal the qZ tN stem with frit glass, and the connecting fittings and stems that simultaneously seal the four open ends of two U-shaped glass tubes are inexpensive. can be used, so it is possible to provide an inexpensive compact fluorescent lamp with fewer manufacturing steps and excellent mass productivity. In addition, it is easy to form a fluorescent film with a uniform thickness on the inner surface of a U-shaped glass tube, and there is no fear that this fluorescent film will deteriorate due to the heat generated when sealing the end of the glass tube with frit glass. Therefore, a bright fluorescent film with stable quality can be obtained, and a product with stable quality and excellent commercial value can be provided.

[Brief explanation of the drawing]

1 and 2 are a front view and a side view including a partial cross section showing one embodiment of the present invention, FIG. 3 is an enlarged front view of the main part of FIG. 1, and FIG. 4 is a main part of FIG. 2. An enlarged side view, FIG. 5 is an exploded perspective view of the connecting fitting in FIG. 4, FIG. 6 is an exploded enlarged perspective view of the stem in FIG. 4 and parts sealed to it with glass, and FIGS. 7 to 9. 1 is a perspective view of each step showing the manufacturing process of the fluorescent lamp in FIG. 1, FIG. 10 is an enlarged sectional view of the glass tube and connecting fittings in FIG. 9, and FIG. 12 is a sectional view taken after sealing the portion shown in FIG. 10, and FIG. 13 is a sectional view taken along line BB in FIG. 12. FIG. 14 is a side view of a main part including a partial cross section showing another embodiment of the present invention, and FIG. 15 is a sectional view of the part shown in FIG. 14 when assembled before sealing. 16 and 17 are front and side views of a conventional compact fluorescent lamp, FIGS. 18 to 21 are perspective views at each step showing the manufacturing process of the fluorescent lamp in FIG.
2 and 23 are partially enlarged sectional views before and after sealing in the process of FIG. 21. (16) - Fluorescent film, (17) - U-shaped glass tube,
(18a) (18b) (18c) - Frit glass, (19L-m series of fittings, (20) series of through holes, (21) - Stem, (30) (30'
)・−・Electrode, (36)−・−Stem. Patent applicant: NEC Home Electronics Co., Ltd. ISlV, 41 (MEJ (2))
弗2 fig.(IO'l l'im
l1ffl) 3rd 14th (entering the spear 204 moss part width ℃η9 41st (spear 204 o trace clay*', 6 Fig. wa l57f7 Fig. 8 '1-2914 T'-101
-4 12th UA: 4113 drawing 14th figure
6 Figure 1sLs diagram; J17f'ffl Figure 19

Claims (1)

[Claims] (1) Two U-shaped glass tubes with a fluorescent film on their inner surfaces and open at both ends, and each of the two U-shaped glass tubes installed in parallel is sealed with a frit glass at one end facing each other, and
A cap-shaped connecting fitting having a double bottom structure that serves as a communication hole that connects one end of each of the two U-shaped glass tubes to form a discharge path, and the other end of each of the two U-shaped glass tubes. A compact fluorescent lamp characterized by comprising a stem with a pair of electrodes sealed with frit glass.