JPH03283345A - Flat bulb and manufacture of flat bulb - Google Patents

Abstract

PURPOSE:To obtain a fluorescent lamp to which a film of fluorescent material is uniformly applied and whose luminance is uniform by joining the respective major axis sides of glass bulbs to each other to form a connecting portion, and forming within the connecting portion a connecting hole whose cross section is in the form of an ellipse having a major axis and a minor axis, the major axis being larger than the minor axis of each glass bulb. CONSTITUTION:Glass bulbs 1, 1 are made to abut on each other at their respective openings 6, 6 and are heated by a burner 7 and joined to each other to form a connecting portion 8 and the connecting portion 8 is heated mainly from its longitudinal direction which is the direction of the axis of each glass bulb 1 and gas is allowed to flow into each bulb 1 from the other end of each bulb 7 so that the inside of each bulb 1 is pressurized. The cross section of the connecting portion 8 is almost in the form of an ellipse in which a major axis 82 is extended in the direction of the axis of each bulb 1 and a minor axis 81 in the direction perpendicular to that of the axis. Thus a connecting hole whose major axis 82 is larger than the minor axis 12 of the glass bulb 1 is formed. A fluorescent lamp to which a film of fluorescent material is uniformly applied and whose luminance is uniform is thus obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a flat valve formed by connecting a plurality of valves having a flat cross-sectional shape via a connecting portion, and The present invention relates to a connecting hole and a method for manufacturing the same.

(Prior art) A conventional flat valve and its manufacturing method is disclosed in 1, for example, Japanese Patent Application Laid-open No. 6
It is described in Japanese Patent No. 2-98532.

This flat valve and its manufacturing method are shown in Figures 4(a) and (b).
, (c).

In the figure, (1), <1) are glass bulbs constituting the arc tube, and these glass bulbs (1), (1) are U-shaped discharge paths (2).

(2). These discharge paths (2), (2) have a flat cross-sectional shape, and the discharge path of the adjacent straight portion of each glass bulb (1) <2 (2) has a flat axis direction that coincides with the discharge path (2). They are arranged side by side.

As a method for manufacturing the above-mentioned flat bulb, glass bulb (1)
, (1), the side wall on the end side is heated by a heating burner (5). At this time, the side wall to be heated is a narrow surface having a flat cross section, that is, a flat side wall in the long axis direction, and a portion of the side wall near the end is heated.

When the side walls of the above-mentioned bulbs (1), (1) become soft, inert gas is blown through the exhaust pipes (4), (4).This gas pressure causes the gas inside the glass bulbs <1), <1> to The pressure increases, and the softened portion is blown open by this gas pressure, resulting in openings protruding outward <6), <6)
is formed.

Next, the glass bulbs <1), <1) are butted against each other at the openings <6), <6), and heated with a burner (7) to join them.

In this way, the glass bulbs (1), (1) having a U-shaped discharge path (2) are connected at their ends,
The glass bulbs (1), (1) are connected through the connecting hole (8).
is conductive. As a result, an arc tube (9) having a curved discharge R (2) is formed.

After that, a phosphor is applied inside this arc tube (9) and an electric filament is applied.
(3) A stem having a #j trachea (4) is sealed at both ends of the arc tube (9), the exhaust is exhausted through the exhaust pipe (4), and mercury and starting gas are filled in to form a fluorescent lamp. I can do it.

As mentioned above, the glass bulbs (1), (1) are butted against each other at the openings (6), (6), and the burner (7)
), and then the glass bulbs (1), (1) having a U-shaped discharge path (2) are connected at their ends, and are connected through the connecting hole (8). The above glass bulb (1).

(1) is joined.

Therefore, the portion of the glass bulb to be heated is uniformly heated, and only a narrow surface is required, which has the advantage that residual strain is less likely to remain on the wall surface around the connecting portion, and the occurrence of cracks is suppressed.

(Problem to be Solved by the Invention) However, in the glass bulb, the connecting hole of the connecting portion is formed on the narrow side of the glass bulb where the cross section of the bulb is flat, that is, on the side wall of the flat long axis direction. Because the diameter of the connecting hole is relatively small, when applying the phosphor, the phosphor does not flow smoothly, resulting in uneven coating, and when drying, the drying air does not flow smoothly, causing the phosphor to dry. Undried phosphors are caused to flow by this air, resulting in uneven drying.

The present invention has been made in view of the above circumstances, and the connecting holes with relatively small diameters, which cause uneven coating and drying, are replaced with connecting holes that allow minimal phosphor and dry air to flow smoothly. An object of the present invention is to provide a flat valve and a method for manufacturing the flat valve.

[Structure of the Invention] (Means for Solving the Problems) In the first invention of the present application, at least two glass bulbs having a major axis and a minor axis and whose cross section is approximately square planar, and the two glass bulbs described above are provided. It is characterized by comprising a connecting portion formed by joining the long diameter sides of the bulb together, and a connecting hole formed inside this connecting portion and having a diameter equal to or larger than the short axis of the glass bulb.

In the second invention of the present application, a portion of at least one or two glass bulbs having a major axis and a minor axis and a substantially flat cross section is heated, and this portion is pressurized to form each glass bulb. a step of forming an opening, a step of joining the openings to form a connecting portion, and pressurizing the connecting portion,
inside the joint.

The method is characterized by comprising a step of forming a connecting hole having a diameter equal to or larger than the minor diameter of the glass bulb.

(Function) In the first invention of the present application, the inside of the connecting portion formed by joining the long diameter sides of the glass bulb has an elliptical cross section having a major axis and a minor axis, and this major axis is the length of the glass bulb. When a phosphor is coated because a connecting hole having a diameter equal to or larger than the minor axis is formed, a phosphor film formed on the inner surface of the connecting hole of the connecting portion and the inner surface of the glass bulb in the vicinity thereof is uniformly coated.

A fluorescent lamp with uniform brightness can be obtained.

In the second invention of the present application, when forming the connecting portion in the crow bulb, the connecting portion is mainly heated and the inside of the connecting portion is pressurized, so that the cross section thereof becomes an elliptical shape having a major axis and a minor axis. There it is.

Since this connecting hole is formed whose major axis is larger than the minor axis of the glass bulb, when the phosphor is poured and dried, dry air can be flowed smoothly, forming a phosphor film with no uneven coating. can do.

(Example) An example of the first invention and the second invention of the present application will be described with reference to FIGS. 1 to 3.

In the figure, (1) and (1) are glass bulbs constituting the arc tube, with the major axis < 11) 14 m- and the minor axis (12)
It is a flat bulb with 5gv. These glass bulbs (1), (1) have nearly linear discharges 1 (2), <2
> has. This discharge path (2), <2) has a flat cross-section, and the discharge path (2), (2) of the adjacent straight portion of each glass bulb (1) has its flat axis direction. They are placed side by side to match.

As a method for manufacturing the above-mentioned flat bulb, glass bulb (1)
, a part of the side wall on the long axis (11) side of (1) at a distance of 1 (=approximately 8 m) from the end is heated by a heating burner (5).

When the side wall of the above valve (1), (1) becomes soft,
Inert gas is blown through the other end tll (1a). Due to this gas pressure, the gas pressure inside the glass bulb (1) (1) increases, and the softened part is blown out by this gas pressure. , outwardly protruding opening <6>, <
6) is formed.

Next, the glass bulbs (1), (1) are butted against each other at the openings (6), (6), and are heated and bonded by a burner (7) to form a connecting portion (8).

Further, the connecting portion (8) is heated primarily from the longitudinal direction, which is the axial direction of the glass bulb (1), and gas is introduced from the other end (1a) of the bulb (1) to pressurize the inside.

Therefore, regarding the connecting part (8), the glass bulb (1)
The direction in which the axial direction of is perpendicular to this (glass bulb (1)
The glass softens particularly in comparison with the short diameter direction), and expands greatly in the axial direction when the pressure is applied.

As a result, the cross-sectional shape of the connecting portion (8) is formed into an almost elliptical shape, the axial direction is the major axis (82), and the direction perpendicular to this axial direction is the minor axis (81), and
This long diameter (82) is formed in a connecting hole having a diameter of the short diameter (12) or more of the glass bulb.

Therefore, the glass bulbs <1>, (1) are connected at their ends, and the glass bulbs <1), <1> are electrically connected through the connecting hole (8), and the bent discharge path (2) is connected to the glass bulbs <1>, (1). An arc tube is formed having the following characteristics.

At this time, the short diameter (81) of the connecting hole (8) is approximately 311
The short axis (12) of the glass bulb (1) (it is possible to form it larger than the short axis of the above glass bulb), and the long axis (82) was formed to be approximately 3 ml to 151 m, and 100 pieces were molded. (In the method of the present invention, the long axis (
The maximum diameter of 82) is 20-partially limited).

Here, k is the value obtained by dividing the long axis (82) of the connecting hole (8) by the short axis (81) of the connecting hole (8). A phosphor was applied to the surface of the substrate, the phosphor was dried by blowing dry air at 5 (1/sin), and the condition of uneven coating was visually inspected.

The results are shown in Figure 3, where the horizontal axis is ni-hlI axis is the above 1
It represents the visually inspected good product rate (%) out of 00 pieces molded.

In addition, in this example, the major axis < 11) 14 mm and the minor axis (1
A glass bulb (1) having 2>5+gn, that is, an oblateness (major axis/minor axis) of 2.8, was used, but the major axis was set to 10 s.
When the above-mentioned glass bulb is formed in a range of +w to 30m1m and an aspect ratio of 1-5 to 4.0.

From the end to the long-diameter side wall of the glass bulb] (= 3 -
to 15■-) When the connecting parts are provided at a distance, when the dry air is blown at a maximum of 20° (1/5 inch), and when each is varied, the results are the same as in this example. Not much difference was seen.

According to this result, when the above-mentioned k is approximately 2 to 4, when the phosphor is flowed and dried, the phosphor flows smoothly along the inner surface of the glass bulb, and the subsequent drying air also flows smoothly. A phosphor film without uneven coating can be formed. In this range, the rate of non-defective products exceeds half, which improves work efficiency in mass production.

Here, the short axis (81) of the connecting hole (8) is.

Although it is possible to make the glass bulb larger than the minor axis, the upper limit will be explained below.

In the present invention, the above glass bulb (1).

(1) The above-mentioned openings (6) and (6) are butted against each other, heated with a burner (7) to join them, and further pressurized this connection part so that the short diameter of the glass bulb is inside the connection part. (12), if the diameter (81) of the connecting hole (8) is approximately twice the short diameter (12) of the glass bulb (1), this connection Since the thickness of the glass in the hole (8) is thinner than that of the glass bulb (1), there is a high possibility that cracks will occur. Therefore, the diameter (81) of the connecting hole (8)
It can be considered that the limit is about 200% of the minor axis (12) of the glass bulb (1).

[Effects of the Invention] In the first invention of the present application, the inside of the connecting portion formed by joining the long diameter sides of the glass bulb has an elliptical cross section having a major axis and a minor axis, and the major axis is the same as that of the glass bulb. If a connecting hole with a diameter larger than the minor axis of the bulb is coated with phosphor, the phosphor film formed on the inner surface of the connecting hole in the connecting portion and the inner surface of the glass bulb in the vicinity may be uniformly coated. , it is possible to obtain a fluorescent lamp with uniform brightness.

In the second invention of the present application, when forming the connecting portion in the glass bulb, the connecting portion is mainly heated and the inside of the connecting portion is pressurized.

Its cross section is an ellipse with a major axis and a minor axis, and this major axis forms a connecting hole with a diameter equal to or greater than the minor axis of the glass bulb, so that the drying air can be smoothly flowed when the phosphor is poured and dried. This makes it possible to form a phosphor film with no uneven coating.

[Brief explanation of drawings]

1 to 3 show an embodiment of the first invention of the present application, and FIG. 1(a) shows the Y-)′ of the flat valve of this embodiment.
Cross-sectional view, (b) is XX cross-sectional view of (a), (C) is (b)
2-2 sectional view of ), FIG. 2 shows an embodiment of the second invention of the present application, (a) is a diagram showing the step of heating a part of the long diameter side end of the glass bulb, (b) is a diagram showing the process of heating a part of the long diameter side end of the glass bulb. Figure 3 shows the process of heating a part of the long diameter side end of the bulb and pressurizing this part to form an opening in each glass bulb. Figure 3 is a diagram showing the non-defective product rate. Figure 4 1 shows a conventional example, and (a) is a diagram showing a process of heating a part of the long diameter side end of the glass bulb.
(b) is a diagram showing a process of pressurizing this part to form an opening in each glass bulb, and (c) is a diagram showing a process of joining the openings of the glass bulbs to form a connecting part. . l... Glass bulb, 11... Major axis, 12... Minor axis, 8... Connecting portion, 81-... Connecting hole minor axis, 82-...
・Long diameter of connecting hole.

Claims (2)

[Claims] (1) At least two glass bulbs having a major axis and a minor axis and having a substantially flat cross section; a connecting part formed by joining the major axis sides of the two glass bulbs; and the interior of this connecting part. a connecting hole, the cross section of which is shaped like an ellipse and has a major axis and a minor axis, the major axis of which is greater than or equal to the minor axis of the glass bulb. (2) heating a part of at least two glass bulbs each having a major axis and a minor axis and having a substantially flat cross section, and pressurizing this part to form an opening in each glass bulb; A process of joining the openings to form a connecting part, and heating the connecting part mainly from the axial direction of the glass bulb and pressurizing the inside of the connecting part, so that the cross section has a major axis and a short axis. 1. A method of manufacturing a flat bulb, comprising the step of forming a connecting hole having an elliptical shape, the major axis of which is greater than the minor axis of the glass bulb.