JPS59143238A - Method for manufacturing halogen lamp - Google Patents

Abstract

PURPOSE:To obtain a halogen lamp of long life, by filling in the glass bulb a gas including an inert gas and phosphine during the evacuation process, so that the oxide produced may be reduced by the phosphine. CONSTITUTION:As the gas to be filled in the glass bulb during the evacuation process, an inert gas of nitrogen, argon, or mixture of them with a small amount of phosphine is used. The phosphine, when the filament in the glass bulb is heated for illuminating, easily resolves into PH and hydrogen by the heat. The PH can reduce the tungsten oxide produced since the PH becomes phosphorus oxide taking the oxygen from the tungsten oxide. The amount of the phosphine to be added to the inert gas should be between 0.1% and 3% by volume.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a halogen light bulb.

Conventional structure and problems When making a halogen light bulb using bromine or chlorine, if oxygen remains in the glass tube, the lifespan will be shortened.

Therefore, it is necessary to remove oxygen from the bulb as much as possible.

Conventionally, in general, in the middle of the exhaust process, an inert gas containing several percent hydrogen is filled in the glass tube, and the glass tube is heated from the outside with a burner, etc., and a filament is lit, and the heat causes the inside of the glass tube to rise. A method was used to reduce the metal material. However, since such a method cannot sufficiently reduce the metal material inside the glass tube, oxygen remains inside the glass tube, causing a short life.

OBJECTS OF THE INVENTION The present invention solves these problems and provides a manufacturing method that does not allow oxygen to remain in the glass tube and that makes it possible to obtain a long-life halogen light bulb.

Structure of the Invention The present invention is designed to reduce the oxide of the metal material in the glass tube with phosphine by filling the glass tube with an inert gas and a gas containing phosphine during the evacuation process.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

The figure shows a 100V50OW single-ended halogen light bulb used for general lighting; 1 is a glass tube made of quartz, etc.; 2
3 is a double-coiled tungsten filament provided inside the glass tube 1; 4 and 5 are a sealing portion;
6 indicates an internal lead-in line, and 6 indicates a filament support line. The filament support wire 6 and the internal lead-in wires 4 and 5 have their bases embedded in a glass rod-shaped body 7 by heating processing. 8 and 9 are molybdenum foils, 1o and 1
1 is an external lead-in line.

In a halogen light bulb having such a structure, a filament support wire 6 is attached to a glass rod-shaped body 7, and internal lead-in wires 4 and 6
When embedding by heating processing, the filament support wire 6,
Internal lead-in wires 4 and 5 are often oxidized. The oxidation can be removed by chemical polishing or electrolytic polishing, but it is difficult to completely remove it. If a halogen light bulb is completed by sealing and exhausting while leaving such oxidation, and filling in a small amount of halogen compound along with an inert gas as the filler gas, this halogen light bulb may cause early blackening or
It may have a short lifespan.

In order to solve these problems, it is necessary to remove the oxygen remaining inside the glass tube to the outside of the glass tube.

As mentioned above, in general, during the evacuation process, the glass tube is filled with an inert gas containing several percent hydrogen, and the glass tube is heated from the outside with a burner, etc., and a filament is lit, and the heat is used to cause the inside of the glass tube to rise. Methods have been used to reduce the metal materials, but in order to reduce the oxidized metal materials in the glass tube with hydrogen, it is necessary to bring the metal materials to a temperature of 1000° C. or higher. However, in reality, metal materials other than filaments are
It is difficult to heat above 000'C.

Therefore, we investigated a method to remove oxidation at a lower temperature.

The inventor first considered filling in an inert gas with a small amount of methylene bromide added during the exhaust process, and lighting the filament in the filled gas. When heated, methylene bromide decomposes into carbon and hydrogen bromide. At higher temperatures, hydrogen bromide decomposes into hydrogen and bromine. When this bromine combines with tungsten oxide, it becomes tungsten oxybromide. Tungsten oxybromide has a low evaporation temperature and is easily evaporated by heat from the filament and heat from a burner, etc. from outside the glass tube.
It was thought that it would be possible to exhaust the air outside the glass tube during the exhaust work. However, when we actually examined the prototype,
It turned out that things didn't go as expected. It was discovered that the cause of this was that hydrogen bromide produced by decomposition of methylene bromide was hardly decomposed, so it was not possible to obtain enough bromine to evaporate tungsten oxide.

When the amount of methylene bromide in the filler gas was increased to increase the amount of bromine, progress was made in the desired direction for evaporating tungsten oxide, but the carbon released when methylene bromide decomposed was It adhered to the filament, embrittled the filament, and caused blackening of the tube wall, making it impossible to put it to practical use.

It was possible to sufficiently evaporate tungsten oxide using a sealed gas containing bromine in an inert gas without using a bromine hydrocarbon, but the exhaust machine would be attacked by the bromine, making it impractical. could not be provided.

Therefore, the inventor investigated a method for reducing tungsten oxide without using bromine.

Nitrogen,
We investigated using a trace amount of phosphine together with an inert gas consisting of argon or a mixture thereof. The phosphine lights up the filament inside the glass tube. It is easily decomposed by the heat and becomes PH and hydrogen. P
When H meets oxygen and tungsten oxide, they combine to form phosphorus monoxide.

-The phosphorus oxide is exhausted out of the glass tube together with the inert gas.

In the case of hydrogen bromide, the bond between bromine and hydrogen is strong, so it was not possible to reduce tungsten oxide, but in the case of PH, the bond between KldlJ and hydrogen is broken due to the strong affinity between phosphorus and oxygen. Phosphorus removes oxygen from tungsten oxide and becomes phosphorus oxide, so tungsten oxide can be reduced.

As a result of experiments on the amount of phosphine sealed in inert gas, it was found that if the amount is less than 0.1 volume, the oxide inside the glass tube cannot be removed, causing early blackening and shortening the lifespan of halogen bulbs. Occurred. In fact, when the volume was more than 3%, the halogen cycle was disrupted due to the phosphorus remaining in the glass tube, often resulting in blackening.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention can provide a method of manufacturing a halogen light bulb that does not leave oxygen in the glass tube and has a long life.

[Brief explanation of the drawing]

The figure is a front view showing an example of a non-rogen light bulb according to the present invention. 1... Glass tube, 3... Filament, 4, 6... Internal lead-in wire, 6... Filament support line, 7... Rod-shaped body.

Claims (1)

[Claims] During the exhaust process of halogen light bulbs, nitrogen is added to the glass tube.
A gas containing phosphine is sealed in argon or a mixture thereof, and the metal material in the glass tube is heated while the filament is lit, and the metal material in the glass tube is heated from the outside of the glass tube to remove the metal particles in the glass tube. A method for manufacturing a halogen light bulb, comprising enclosing an oxide with a gas consisting of the phosphine and a halogen compound.