JPH05182634A - Chipless discharge tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent the outward swelling of a glass bulb, and make the external shape compact by using a glass stem, of which softening temperature is lower than that of a glass bulb. CONSTITUTION:In a chipless discharge tube, which consists of a glass bulb 1 and a glass stem 4 arranged in both ends of the glass bulb 1 and provided with an electrode structural body 7, a glass stem 4, of which softening temperature is lower than that of the glass bulb 1, is used. In the case of sealing both of them, since the glass stem 4 is welded before the glass bulb 1 is softened, outward swelling of the glass bulb 1 is eliminated to make the external shape compact. A glass bulb 1 made of soda glass and a glass stem 4 made of lead glass are desirable.

Description

Detailed Description of the Invention

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chipless discharge tube manufactured by vacuum sealing and a method for manufacturing the chipless discharge tube, and more particularly to a material for a glass bulb and a glass stem used in the chipless discharge tube. .

[0003]

2. Description of the Related Art Fluorescent lamps, which are discharge tubes used as OA devices for backlights and facsimiles, tend to be miniaturized. Particularly, in a fluorescent lamp using an exhaust pipe, the entire fluorescent lamp becomes longer by the length of the exhaust pipe.

In such a case, a discharge tube having no exhaust tube (hereinafter referred to as a chipless discharge tube) is provided.
That is, the glass stem without the exhaust pipe is sealed to the glass bulb. This directly softens and welds both glasses in a vacuum sealing furnace that creates an atmosphere at a high temperature. Alternatively, a frit glass is interposed between the two, and the frit glass is melted to seal the both.

[0005]

However, when the frit glass is interposed and the frit glass is melted to seal the two, the material cost is increased and the frit glass coating work is increased. There are many problems, such as doing and becoming a source of impure gas.

Further, when both glasses are softened and fused directly in a vacuum sealing furnace, the gas pressure inside the glass bulb rises during melting of the respective glasses, and as shown in FIG. There is a problem that the vicinity of the fusion zone bulges outward in a convex shape.

Further, at this time, there is a problem that the phosphor coated on the glass bulb is baked in an atmosphere at a high temperature and the luminous efficiency at both ends of the fluorescent lamp is remarkably lowered.

The present invention has been made in view of the above circumstances, and does not use frit glass, but directly softens and welds both glasses in a vacuum sealing furnace and near the melting portion of the glass bulb. It is an object of the present invention to provide a chipless discharge tube and a method for manufacturing the chipless discharge tube, in which the phosphor does not bulge outwardly in a convex shape and the phosphor is not burned in an atmosphere at a high temperature.

[Structure of Invention]

[0010]

The first invention according to claim 1 of the present application is a tipless discharge tube comprising a glass bulb and glass stems provided at both ends of the glass bulb and provided with electrode structures. In the above, the softening temperature of the glass stem is lower than the softening temperature of the glass bulb.

A second invention according to claim 2 of the present application is a step of arranging a glass stem having a tapered peripheral edge on carbon for heating having a hole for supporting an external lead wire, and A step of disposing a glass bulb having a softening temperature higher than the softening temperature of the glass stem on an outer peripheral portion of the glass stem, and a step of heating the carbon for heating to weld the glass stem to the glass bulb were provided. It is characterized by

A third invention according to claim 3 of the present application is the method for manufacturing a chipless discharge tube according to claim 2, wherein the glass bulb is soda glass and the stem is lead glass. It is characterized by

According to a fourth aspect of the present invention, in the method of manufacturing a chipless discharge tube according to the second aspect, a phosphor is applied to the inner surface of the glass bulb. To do.

[0014]

According to the first invention, the softening temperature of the glass stem is lower than the softening temperature of the glass bulb, and the glass stem is welded before the softening of the glass bulb. Does not bulge outward, and the outer shape is compact.

According to the second invention, a glass bulb having a softening temperature higher than the softening temperature of the glass stem is heated on the outer peripheral portion of the glass stem by heating carbon, and the glass bulb is softened before the glass bulb is softened. Since the stem is welded, the glass bulb does not bulge outward,
The glass stem is evenly sealed to the glass bulb.

According to the third invention, the glass bulb is soda glass and the stem is lead glass, and the lead glass can be melted and sealed before the soda glass is melted.

According to the fourth invention, it is possible to prevent the phosphor formed on the inner surface of the glass bulb from being burnt in the atmosphere at a high temperature.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first to fourth inventions of the present application will be described below with reference to FIGS.

First, a fluorescent lamp which is a chipless discharge tube will be described with reference to FIG. Glass bulb (1) made of soda glass material (softening temperature 697 ° C)
The cross section (11) has a substantially flat shape, and the phosphor (2) is applied to the inner surface of the bulb (1).

A glass stem (4) made of a lead glass material is joined to both ends of the glass bulb (1) by a method described later, and at the same time, an appropriate amount of mercury and an inert gas of argon are joined. Are enclosed to form a fluorescent lamp.

Two external lead wires (6) and (6) are erected on the glass stem (4), and an electrode structure (7) made of nickel is installed between these lead wires. ing. The glass bulb (1) may have a circular cross section.

Next, a method of manufacturing a fluorescent lamp, which is a method of manufacturing a chipless discharge tube, will be described with reference to FIG. The heating carbon (5) is formed with a hole (51) for supporting the external lead wires (6), (6) of the fluorescent lamp and a groove (52) in which the glass bulb (1) is arranged. A glass stem (4) made of a lead glass material and a glass bulb (1) made of a soda glass material are set. At this time, if the peripheral portion of the glass stem (4) is formed thinner than other portions, the effect of welding is further improved.

After that, the carbon (5) for heating is energized to bring the surface temperature of the carbon (5) to about 650.
The temperature is controlled to be 0 ° C., the peripheral portion of the glass stem (4) is melted, and the glass bulb (1) is sealed. Further, the space (8) between the glass stem (4) and the heating carbon (5) suppresses an unnecessary temperature rise in the central portion of the glass stem (4), and thus the electrodes of the external lead wires (6) and (6). This prevents deviation and displacement from the structure (7).

Further, since the glass stem (4) is welded before the temperature of the glass bulb (1) rises, the burning of the phosphor (2) coated on the inner surface of the glass bulb (1) is completely prevented. can do.

Further, another embodiment will be described with reference to FIG. Whereas the glass stem (4) is inserted into the glass bulb (1) in the previous embodiment, the glass bulb (1) is mounted on the glass stem (4) in the present embodiment. Things are also possible.

Next, the function and effect of the present invention will be described.

In the product, the softening temperature of the glass stem (4) is lower than the softening temperature of the glass bulb (1), and the glass stem (4) before the softening of the glass bulb (1). Since the glass bulb (1) is welded to the glass bulb (1), the glass bulb (1) does not bulge outward and the outer shape is compact.

In the manufacturing method, the glass bulb (1) having a softening temperature higher than the softening temperature of the glass stem (4) is heated on the heating carbon (5) on the outer peripheral portion of the glass stem (4), Since the glass stem (4) is welded before the glass bulb (1) is softened,
The glass stem (4) is uniformly sealed to the glass bulb (1) without the glass bulb (1) bulging outward.

When the phosphor (2) is formed, the phosphor (2) formed on the inner surface of the glass bulb (1) is prevented from being burnt in the atmosphere at a high temperature.

[0030]

As described in detail above, as the effect of the first invention, the softening temperature of the glass stem is lower than the softening temperature of the glass bulb, and Since the glass stem is welded,
The glass bulb does not bulge outward and the outer shape is compact. As an effect of the second invention, a glass bulb having a softening temperature higher than the softening temperature of the glass stem is heated to heating carbon on the outer peripheral portion of the glass stem, and the glass bulb is softened before the glass bulb is softened. Since the stem is welded, the glass stem does not bulge outward and the glass stem is uniformly sealed to the glass bulb. As an effect of the third invention, the glass bulb is soda glass, the stem is lead glass,
Before the soda glass melts, the lead glass melts and can be sealed, so the glass bulb should not bulge outward. Furthermore, the effect of the fourth invention is that the phosphor formed on the inner surface of the glass bulb is prevented from being burnt in an atmosphere at a high temperature.

[Brief description of drawings]

FIG. 1 is an exploded configuration diagram of a chipless discharge tube according to the present invention.

FIG. 2 is a vertical cross-sectional view of a chipless discharge tube relating to a method for manufacturing a chipless discharge tube of the present invention.

FIG. 3 is a vertical sectional view of a chipless discharge tube relating to a method of manufacturing a chipless discharge tube according to another embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a tipless discharge tube according to a conventional method of manufacturing a tipless discharge tube.

[Explanation of Codes] 1 ... Glass bulb, 2 ... Phosphor, 4 ... Glass stem, 5
... Carbon for heating, 6, 6 ... Lead wire, 7 ... Electrode structure.

Claims (4)

[Claims] 1. A tipless discharge tube comprising a glass bulb and glass stems provided at both ends of the glass bulb and provided with electrode structures, wherein the softening temperature of the glass stem is higher than the softening temperature of the glass bulb. Chipless discharge tube characterized by low price. 2. A step of arranging a glass stem having a tapered peripheral edge on heating carbon having a hole for supporting an external lead wire, and a softening temperature of the glass stem on an outer peripheral portion of the glass stem. A chipless discharge tube comprising: a step of disposing a glass bulb having a higher softening temperature; and a step of heating the heating carbon to weld the glass stem to the glass bulb. Method. 3. The method of manufacturing a tipless discharge tube according to claim 2, wherein the glass bulb is soda glass and the stem is lead glass. 4. The method for manufacturing a chipless discharge tube according to claim 2, wherein a phosphor is applied to the inner surface of the glass bulb.