JPH01217851A - Manufacture of bulb - Google Patents

Abstract

PURPOSE:To obtain a lamp with no degradation in heat resistance and mechanical strength by putting a flare of a diameter larger than that of the aperture end of a glass bulb on the said aperture end coated with low melting glass, and heating the flare so as to melt over the aperture end of the glass bulb. CONSTITUTION:Low melting glass layer 10 is coated on or melted to the aperture end of a glass bulb 1, and the flare 14, the diameter of which is larger than that of the aperture end of the bulb 1, of a stem 2 is put on the said layer 10 and heated with a gas burner 11. The glass layer 10 is melted by heating and wets the contact surface of the flare 14 and the bulb 1 to close the gap between the bulb 1 and the flare 14. Further the glass of the flare 14 is melted by heating with the burner 11 to form glass pool over the aperture end of the bulb 1, and medical glass layer 13 is produced together with the melted glass of the bulb 1 and the glass layer 10. Therefore the glass layer 10 cannot be exposed to the air, and major part of which is made to the glass layer 13, so the ejection of impure gas can be eliminated to obtained a lamp of high mechanical strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method of manufacturing a tube in which the sealing means between the open end of a glass bulb and the flare of a stem is improved.

(Prior Art) In the manufacture of bulbs, such as incandescent bulbs, there is a step of sealing the stem of a mount to the open end of a glass bulb.

The above sealing methods include a burn-off sealing method in which the glass bulb is heated and melted with a gas burner at a predetermined distance from the open end of the glass bulb, welded to the flare of the stem of the mount, and the glass bulb on the open end side is burned off; A butt seal method in which the flared portion of the stem faces the open end of the valve with a predetermined gap, the two are heated and melted with a gas burner, and then sealed together.
There is a pier f'/-# method in which a mount is interposed at the open end of a glass bulb used in automobile light bulbs, this part is heated and melted, and then pinch-sealed. These sealing methods require heating and melting a wide area near the opening end of the glass bulb with a gas burner, which can easily cause the metal part of the mount to oxidize and the getter of the mount to deteriorate. Cracks may occur due to glass distortion. In view of the above points, conventional sealing devices take time to annealing the glass to remove strain, require a large number of processing heads, and are expensive and difficult to maintain. In addition to the above sealing method,
There is a dip seal method in which the sealed part is immersed in a melting tank of low melting point glass, and a brazing sheet method in which a thin metal plate covered with low melting point glass is used. This method has a low sealing temperature and requires only one local heating, which prevents oxidation of the mount and getter and cracking of the glass, but since low melting point glass is used, the heat resistance and mechanical strength of the sealed part are low, and Low melting point glass generates a large amount of impure gas such as water vapor at a relatively low temperature, which has the disadvantage of reducing the characteristics and lifespan of tubes, such as light bulbs, which become hot during use. With high-pressure light bulbs filled with inert gas, there was a risk of the glass bulb breaking and leaking.

(Problems to be Solved by the Invention) As mentioned above, with conventional sealing methods, cracks are likely to occur due to oxidation of the mount and distortion of the glass pulp. was difficult. In addition, even if low-melting point glass is used, impurity gases are generated from the low-melting point glass, and low-melting point glass has low heat resistance and mechanical strength, making it unsuitable for light bulbs that reach high temperatures. There was a point. The present invention has been developed to solve the above-mentioned problems, and is capable of producing a tube that does not cause oxidation or distortion of the mount, does not complicate the manufacturing equipment, and is suitable for tubes that are exposed to high temperatures. The purpose is to provide a method.

[Structure of the invention]

(Means for Solving the Problems) A method for producing a tube according to the present invention includes polymerizing and heating the flared open end having a larger diameter than the open end of the glass pulp through a low-melting glass. It is characterized by having the step of covering and welding the opening end of the.

(Function) The method for manufacturing the tube of the present invention involves attaching or welding low-melting glass to the open end of glass pulp, polymerizing the stem of a flare with a diameter larger than the open end of the glass pulp, and heating it with a gas burner. do. By the above heating, the low melting point glass melts, wets the joint surface of the flare with the glass layer wrap, and closes the gap between the glass pulp and the seventh layer. Furthermore, by heating with a gas burner, the glass forming 7 layers with a larger diameter than the opening end of the glass bulb melts and covers the opening end of the glass pulp to form a lump, and together with the glass of the molten glass pulp and the low melting glass. An intermediate glass is formed.

Therefore, the low melting point glass is not exposed, and a large amount of it becomes the intermediate glass, so that no impurity gas is released and a strong sealing portion with two strengths is formed.

(Example) Details of the manufacturing method of the tube according to the present invention will be explained with reference to the attached drawings. FIG. 1 is a partially cutaway front view of a tube-shaped incandescent light bulb, which is an example of a bulb, immediately after the sealing process of the present invention starts, and FIG. 2 is a partially cut-away front view of the tube-shaped incandescent light bulb after the sealing process is completed. It is a diagram. Mount (
3) of the stem (2) mounted thereon is polymerized. The outer diameter of this seven-layer α shaft is larger than the open end of the glass pulp (1). (3) is an internal lead (4) implanted in the stem (2), (4)
Metal getters such as tantalum (Ta), zirconium (Zr), and titanium (Ti) that adsorb impurity gases (5),
A tungsten filament (6) is connected via (5), and the inner lead (4) is electrically conductively connected to the outer leads (7). (8) is an exhaust pipe attached to the stem (2) and is connected to the exhaust hole (9)K of the stem (2). Since both FIG. 1 and FIG. 2 are before the exhaust process, the end of the exhaust pipe (8) is open.

Furthermore, a low melting point glass layer α1 is adhered to the open end of the glass pulp (1). Glass pulp (1).

Rotate it together with the stem (2) in the direction of the arrow (A) and heat it with a gas burner αυ. ``The above heating melts the low melting point glass layer α1, and the gap between the open end of the glass pulp (1) of the 7-layer I and the joint surface is closed. Furthermore, the 7 layers I of the stem (2) are melted by heating by the gas burner aυ, cover the open end of the glass pulp (1), and melt together with the thickening α2 to form the intermediate glass layer α, completing the sealing. do. Therefore, the method for manufacturing a tube according to the present invention includes the above-described sealing step, and since the sealing is performed via the low-melting glass, the sealed portion can be easily melted.

There is no need to perform operations such as stretching to make the glasses fit together after the sealing process, and the strain stress in the sealing area is reduced and the annealing process can be omitted, simplifying the sealing equipment and making adjustments and maintenance easier. It becomes extremely easy. Also, as mentioned above, most of the low melting point glasses.

Since the material is made of intermediate glass, there is no release of impurity gases and the mechanical strength of the sealed part is strong. Note that heating during the sealing work is not limited to the above-mentioned gas burner, but heating time can be shortened by using electric heating, laser irradiation, etc., and oxidation of the mount can be further reduced. The low melting point glass used in the present invention is
Glass oxides such as B2O33-8in, LiO2
-Na20-20. Na2O-KzO-RbzO,
Modified oxides such as MgO-CaO-8rO.

It is preferable to use a material that is easy to form into an intermediate glass, such as one containing a non-glass oxide such as a modified intermediate oxide such as AJzOx -BeO-TiOz-ThOz.

Further, the low melting point glass may be applied only to the glass pulp on the 7th layer side of the stem, or on both sides.

Furthermore, low melting point glass can be applied by immersing the flare of the valve opening end or stem in a glass liquid melted by electrical heating or in a suspension of powdered glass mixed with a binder such as water, or by applying the liquid. It may be covered.

Furthermore, low melting point glass may be formed into a ring shape and sealed by interposing it in a sealing hole.

Although the above embodiment has been described with the open end of the glass pulp facing upward, it may also be performed with the open end of the glass pulp facing downward. Although the embodiments have been described using light bulbs, the present invention is not limited to the above-mentioned light bulbs, but can be applied to the manufacture of general bulbs such as fluorescent lamps and discharge lamps.

〔Effect of the invention〕

The method for manufacturing the tube according to the present invention has been described in detail above.

A flare having a diameter larger than the open end of the glass pulp is polymerized and heated via a low-melting glass at the open end, and the flare is placed over the open end of the glass pulp and welded,
Unlike conventional sealing methods, the neck of the glass pulp is not extensively heated and low-melting glass is used, so there is no oxidation of the metal parts of the mount or deterioration of the getter, and low-melting glass is used. This is because the flare that covers the open end of the glass pulp prevents it from being exposed, making it an intermediate glass.

Even in tubes such as light bulbs that reach high temperatures, there is no generation of impurity gases, and the glass pulp has the effect of obtaining tubes with excellent properties without deterioration in heat resistance 9 and mechanical strength.

[Brief explanation of the drawing]

FIG. (1)...Crow Pal 7', (2)...
...Stem. (3)...Mount, (14)...
...Freya. Q (e...Low melting point glass layer. I...Gas burner, housing...self-deprecation. αken...Intermediate glass layer.

Claims (1)

[Claims] In order to seal the flare of the stem to the open end of the glass bulb, a flare with a larger diameter than the open end of the glass bulb is polymerized and heated via a low melting point glass, and the flare is attached to the open end of the glass bulb. A method of manufacturing a tube, characterized by placing the tube over the tube and welding it.