JPH01251538A - Connecting method for glass bulb - Google Patents

Abstract

PURPOSE:To make it possible to join glass bulbs together satisfactorily without removing coats on the internal surfaces subject to the join by mutually welding the glasses on the external wall surfaces of respective portions, to be joined together and facing each other, of a pair of glass bulbs at least one of which has its internal surface coated with a membrane. CONSTITUTION:For a pair of glass bulbs 1, 1 at least one of which has its internal surface coated with a membrane 2, glasses 32, 33 on the external wall surfaces of respective portions to be joined together and facing each other, are mutually welded to be joined together and a joining passage 34 is refined to be formed in the joint. As neither of glass bulbs 1, 1 has its external surface coated with the membrane 2, jointing by welding the glasses 32, 33 on the surfaces of both glass bulbs 1, 1 includes no difficulty and, in addition, the membrane 2 can be prevented from being embedded within glass mass at the junction. Further, a joining passage can be formed similarly whether the passage is blown through in one direction after the glasses on both external wall surfaces are mutually welded or the blowing through is carried out prior to mutual welding together. With this procedure it is possible to have the joint well-formed without removing a surface coat on the internal surface of a bulb.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a pair of glass bulbs, each of which has a coating formed on its inner wall surface, by joining and connecting them without removing the coating. The present invention relates to a method of forming a part.

(Prior Art) A method of forming an H-shaped glass bulb by connecting a pair of straight glass bulbs each having a coating such as a fluorescent film on the inner wall surface is disclosed in, for example, Japanese Patent Laid-Open No. 133730/1983. As shown in Figure 2, there is a known method in which opposing connecting portions are locally heated to cause them to protrude outward and then blown apart, and then the protruding portions are welded to each other to form a communicating connecting portion.

(Problem to be Solved by the Invention) If the coating is locally formed on the inner wall surface and made to protrude as in the technique described in JP-A No. 55-133730, the protruding portion will be exposed to the coating on the inner surface. Protrudes while still attached,
The coating exists up to the blown open end. Therefore, if the protrusions are glass-bonded to each other while the coating is still attached, fragments and particles of the coating become embedded in the bonded glass, resulting in a disadvantage that peeling and cracking are likely to occur. Saritote,
The process would be complicated if the coating was removed and then blown out to protrude.

Requires a lot of effort.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for connecting glass bulbs in which a connecting portion can be formed without removing the coating on the inner surface of the bulb.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a method for forming a connecting portion without removing a coating on the inner wall surface of a glass bulb, and the present invention provides a method for forming a connecting portion without removing a coating on the inner wall surface of a glass bulb. The method involves welding the glass on the outer wall surfaces of the opposing connecting portions of the glass bulb so that they communicate with each other, and shaping the communicating portions to form the connecting portions.

(Function) Since no coating is formed on the outer wall surface of the glass bulb, the glass on the outer wall surfaces of both glass bulbs can be joined without any problems by welding them to each other, and there is no coating on the glass at the joint. is never embedded. Moreover, even if the glasses on the outer wall surfaces are welded together and then blown out in one direction to make them communicate, or even if they are blown out in advance and then welded to make them communicate,
Similarly, they can be joined and communicated well. The communicating portion thus formed may be shaped to form a connecting portion having a desired shape and size.

(Example) The details of the present invention will be explained with reference to the following examples.

Example 1 This example is a method of connecting two valves that have been blown out in advance, and the details thereof are shown in FIGS. 1 to 9.

Here, the valves (1), (1) to be connected are in the shape of a straight pipe, as shown in Fig. 1, one end (11) is closed, the other end (12) is open, and the inner wall surface is fluorescent. Membrane or coating (2)
is formed, and a connecting portion (31) is set at a position close to and facing the closed end (11).

First, take one valve (1) and as shown in Fig.
) and plug it with a burner (5) from the outside to the planned connection part (31).
) are placed facing each other and heated with a burner flame (51) to soften the portion to be connected (31). Then, the planned connection section (31)
When the material has softened appropriately, insert the ventilation pipe (4) as shown in Figure 3.
2) Depressurize. Then, as the pressure within the valve (1) progresses, the planned connection portion (31) is recessed inward in the shape of a funnel, and its central portion is eventually torn to form a funnel hole (32). At this time, the coating (2) that was formed on the inner wall surface of the planned connection part (31) before heating remains on the inner slope of the valve (1) of the funnel hole (32), but on the outer slope of the valve (1). is not present at all, and is hardly present at the edge of the hole of the funnel hole (32).

Next, take the other valve (1) and plug the open end (12) with a rubber stopper (41) with a ventilation pipe (42), as shown in Fig. 4, and connect the planned connection part (31). A burner (5) is placed opposite to the valve (1) from the outside, and while heating with the burner flame (51), a moderate amount of air is blown through the ventilation pipe (42) to open the valve (1).
Increase internal pressure. Then, as shown in Figure 5, the planned connection part (31) protrudes outward, and eventually its central part ruptures, forming a reverse funnel (forming the shape of a volcanic crater).
(33) is formed. At this time, the coating (2) that was formed on the inner wall surface of the planned connection portion (31) before heating remains on the slope of the inner wall surface of the valve (1) of the reverse funnel hole (33);
It does not exist at all on the slope outside the valve (1), and it hardly exists in the hole forest of the reverse funnel hole (33). Then, the shape and size of the formed reverse funnel hole (33) must be such that it fits into the inner surface of the funnel hole (32) of one of the valves (1), and if possible, the reverse funnel hole (33) It is desirable that the rim of the hole is inserted deeply into the funnel hole (32).

Alternatively, the other bulb (1) may be heated from the inside as shown in FIG. That is, the burner (5) and the ventilation pipe (4
2) and a rubber stopper (41) with a valve opening end (12).
If the connection area (31) of the valve (1) is heated with the burner flame (51), the connection area (31) will protrude in a volcanic shape due to the internal pressure of the valve (1). Therefore, if the ventilation pipe (42) is closed with a rubber plate (43), the center portion of the inverted funnel-shaped protrusion is torn, and an inverted funnel hole (33) similar to that described above can be formed.

Therefore, as shown in Fig. 7, both valves (1), (1)
are made to face each other, and the reverse funnel hole (33) is fitted into the funnel hole (32). A burner (5) is inserted into one of the valves (1) to heat and soften the fitting portion of both holes (32) and (33), and the auxiliary burner (52) is heated from the outside. Then, as shown in FIG. 8, the glass layers on the outer walls of the funnel hole (32) and the reverse funnel hole (33) melt and weld to each other, and the welded part becomes rounded due to the cohesive force, forming a communicating part (34).
) is formed.

Therefore, as shown in Fig. 9, both valves (1), (1)
Close one side with a rubber stopper (4]) and the other side with a ventilation pipe (42) with a rubber stopper (41), and connect the valve (1) from the ventilation pipe (42).
) while blowing air into the interior, the communicating part (34) is heated and shaped with an auxiliary burner (52) to form an H-shaped connecting part (35).
form. At this time, there may be a part of the inner surface of the connecting part (35) where the fluorescent film (2) does not remain, but since the discharge in this part is weak, it has little effect.

In this way, in the method of Example 1, both valves (1), (
Since the inner side of the valve (1) of the funnel hole (32) (1), that is, the outer wall surface and the outer surface of the valve (1) of the reverse funnel hole (33) are fitted and welded, this welding surface is coated with a coating (2). ), therefore no fragments or particles of the coating (2) will become embedded in the weld, and therefore the joint (3) after shaping will not be present.
Also in 5), there is no embedding of fragments or particles in (2), and peeling or cracking of the joint due to this reason hardly occurs.

Embodiment 2 This embodiment is a method of connecting a previously recessed valve and an inflated valve, and the explanation of Embodiment 1 is used, and the same parts are given the same reference numerals to facilitate understanding. First, the first
Bulbs (1), (1) having one end (11) closed and a coating (2) such as a fluorescent film formed on the inner wall surface are prepared as shown in the figure. Next, take one valve (1) and connect the planned connection part (31) with the burner (1) from the outside as shown in Fig. 2.
5) Heat and soften with the flame (51). At this time, the second
Unlike the embodiment shown in the figure, the open end (12) remains open. Then, the pressure of the burner flame (51) is used to soften the connection planned portion (31) and the connection planned portion (31) is softened.
31) is recessed inward to form a recessed portion (36). Next, the other bulb (1) is taken, and as shown in FIG. 6, the portion to be connected (31) is heated from the inside of the bulb (1) with the flame (51) of the burner (5) to soften it. At this time, unlike the embodiment shown in FIG. 6, the open end (12) remains open. Then, while softening the connecting portion (31), the connecting portion (31) is made to protrude outward using the pressure of the burner flame (51), and the protruding portion (3
7), neither the recess (36) nor the protrusion (37) described above are open, and the coating (2) is formed on the inner surface of the valve (1). ing.

Therefore, as shown in Fig. 10, both valves (1) and (1
) are facing each other, the protrusion (37) is fitted into the recess (36), and the burner (5) is connected to both the valves (1),
(1) and heat the concave portion (36) and protrusion portion (37) from the inside using flames (51) and (51) to weld them. Next, as shown in FIG.
) and the protrusion (37) reaches a suitable temperature and becomes a thin film, stop one burner (5) and increase the strength of the other burner (5) to reduce the pressure of the flame (51). The welded portion is blown out from one direction to form a communicating portion (34). At this time, only the glass layers of the bulbs (1) and (1) are welded, and the coating (2) is formed on both sides of the welded part, so if the welded part is blown from one direction, the glass will soften. Since the force is weak and only in one direction, the phosphor is not embedded in the softened glass.

Therefore, in the same manner as shown in FIG. 10, the communication part (34)
is shaped into a connecting portion (35).

In this Example 2, since the glass on the outer wall of the bulb (1) and (1) are bonded to each other, it is possible to connect them easily and well without removing the coatings (2) and (2), and there is almost no peeling or cracking. There is an advantage that it does not occur. Furthermore, in the method of the second embodiment, the pressure of the flames (51), (51) of the burners (5), (5) is used to form the concave portion (36) and the protrusion portion (37), so the work is easy. There are side effects that are easy.

Embodiment 3 In this embodiment, both glass bulbs (1) are inflated at the same time and connected as they are. Identical parts are given the same reference numerals to facilitate understanding. First, prepare two valves (1), (1) similar to those shown in FIG. 1, and as shown in FIG.
1) are placed in parallel and facing each other. Then, there are burners (5) inside both valves (1) and (1), respectively.

(5) is inserted to heat and soften the connection planned portions (31), (31) from the inside, and the burner flames (51), (
The connecting portions (31), (31) are made to protrude outward under the pressure of 51) to form protruding portions (37), (37), and heating is continued. Then, as shown in FIG. 13, the protrusions (37) of the single valve (1), (1)
(37) protrudes more and more and contacts and welds. At this time, the coating (2) adheres to the inner wall surface of the valve (1) at the welded portion. Therefore, as shown in Figure 11, one burner (5
) is stopped, the other burner (5) is turned on strong, and the welded part is blown out from one direction to form a communication part (34). So the 9th
The communicating part (34) is formed in the same manner as shown in the figure, and the connecting part (35
) to form.

In this Example 3, the glass on the outer wall surfaces of the bulbs (1) and (1) are bonded to each other, so it is possible to connect them easily and well without removing the coatings (2) and (2), and there is almost no peeling or cracking. There are advantages to not doing so. Furthermore, in the method of Example 3, the valves (1), (1) are held in place from the beginning, and the connecting part (35) is heated from the outside by operating the burners (5), (5). It is easy to work because it can be formed, and it also has the added benefit of being able to accurately process the dimensions of each part after completion.

Therefore, as shown in FIG. 14, the present invention arranges four straight pipe valves (1), (1)... on the same plane,
It can also be applied to the manufacture of an M-shaped valve formed by connecting the connecting parts (35), (35), etc. in an M-shape. In addition, there is also a double H-shaped valve, which is made by arranging four straight pipe valves parallel to the grid and connected by three connecting parts, and a double H-shaped valve, which is made by connecting two U-shaped valves. It can also be applied to manufacturing.

Next, the exhaust process of the application example shown in FIG.
5 and 16. As shown in Figure 15, the connected valve (1) has stems (6) at both ends of the valve (1).

(6), seal one exhaust pipe (61), suspend the intermediate connecting part (35) with a hanger (7), and connect the other exhaust pipe (62) to the exhaust port (8). The valves (1) and (1) are heated and evacuated as usual, and then filled with an appropriate amount of mercury along with an inert gas such as argon and sealed.

In this case, as shown in FIG.
35) is in contact with the hanger (7), the temperature rise of the connecting portion (35) is slow during the above-mentioned evacuation process, and therefore degassing tends to be insufficient. However, since the connecting portion (35) is not very noticeable, even if the inner surface of the connecting portion (35) becomes black or becomes dirty and its brightness decreases, the appearance will not be harmed.Furthermore, the connecting portion (35) If the inner surface is not coated with phosphor, the effect of insufficient degassing due to the hanger (7) is reduced.

Although not shown, the 11-shaped protrusion of the valve (1) may be chucked in place of the connecting part during the exhaust process. In this case, the protrusion is cooled by the chuck during the exhaust process and the temperature rise is slowed down. Therefore, even if degassing becomes insufficient and localized blackening occurs at a later date, this protrusion is located outside the discharge path, so the light emission is weak and the brightness is low, so even if the brightness decrease due to blackening occurs, it will not be noticeable. .

In short, for exhaust, select a part that is inconspicuous from the outside, a part with weak light emission, etc. among the valves, connecting parts, or curved parts, and chuck or suspend it.

In addition to fluorescent coatings, the coating includes all coatings that are harmful when embedded in glass, such as light-reflecting particle coatings, metallic light-reflecting coatings, metal oxide coatings for glass protection, and multilayer coatings of these. . Thus, the use of the valve to which the present invention is applied does not matter. As long as the coating is formed on at least one of both bulbs, the present invention is effective.

〔Effect of the invention〕

As described above, the method for connecting glass bulbs of the present invention involves welding and communicating the glasses on the outer wall surfaces of the opposing connecting portions of a pair of glass bulbs, at least one of which has a coating formed on its inner surface. Since this communicating part is shaped and formed into a connecting part, it is possible to connect well without removing the coating on the inner surface of the planned connecting part, and furthermore, there is no possibility that pieces or particles of the coating will be embedded in the glass layer of the connecting part. Because there are no cracks, there is almost no chance of the joints peeling or cracking, and the defect rate has been drastically reduced.

[Brief explanation of the drawing]

Figures 1 to 9 are explanatory diagrams explaining step-by-step the first embodiment of the glass bulb connection method of the present invention, and Figures 10 and 11 illustrate two main steps of the second embodiment. 12 and 13 are explanatory diagrams illustrating two main steps of the third embodiment, FIG. 14 is a front view of another application example of the present invention, and FIG. 15 is a diagram illustrating the two main steps of the third embodiment. FIG. 16, which is an explanatory diagram illustrating the exhaust process of the applied example, is an enlarged sectional view of the main part.

Claims (1)

[Claims] A pair of glass bulbs, each of which has a coating formed on the inner wall surface of at least one of the glass bulbs, are welded to each other on the outer wall surfaces of the opposing connecting portions to communicate with each other, and this communicating portion is shaped to form a connecting portion. A method for connecting glass bulbs, characterized by: