JPS63164155A - Incandescent lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to improvements in the construction of incandescent lamps using bulk getters.

(Prior Art) Some incandescent light bulbs have a structure in which a bulk getter of zirconium, tantalum, or the like is attached to a lead wire or the like that supports a tungsten filament inside a glass bulb. An incandescent light bulb equipped with such a bulk getter requires removal of impurity gas occluded by the bulk getter, and it is necessary to pre-process and activate the bulk getter using high-temperature exhaust or the like. As one of the methods, the present inventor proposed patent No. 589,399, ``Method for exhausting an incandescent light bulb,'' and Patent No. 1,226,930, ``Method for replacing gas in an envelope.'' The former is a method for exhausting incandescent light bulbs in which hydrogen or a forming gas containing hydrogen mixed with an inert gas is sealed in a glass bulb and the filament is heated by electricity. This is a method that repeats the steps of introducing high purity cleaning gas, releasing it with K, and exhausting it together with the high purity cleaning gas to a degree of vacuum that does not reach a molecular flow. Release of impurity gas from the bulk getter provided in the glass bulb by applying the above method,
Sufficient discharge became possible, and getters with high activity could now be obtained. However, when using such a highly active bulk getter, oxygen, hydrogen, and carbon dioxide gas inside the glass bulb.

-Although most impurity gases such as carbon oxide can be removed,
At the same time, it was found that nitrogen, etc. in the filler gas was absorbed by the bulk getter and its concentration decreased, making it easier for arcs to occur and for the filament to break due to arcs. Generally, the inert gas sealed inside the glass bulb of an incandescent light bulb is 5 to 1 % of a rare gas such as argon or krypton.
A gas mixed with 5% by volume of nitrogen, etc. is sealed at a pressure lower than atmospheric pressure.The mixture of nitrogen, etc. prevents the filament from breaking due to arcing, but as mentioned above, the bulk getter If such substances are absorbed, arc breakage of the filament is likely to occur. As a countermeasure to this problem, it is possible to increase the mixing ratio of nitrogen, etc., but nitrogen has a molecular weight of 28.01, which is considerably smaller than argon, which has a molecular weight of 39.95, or krypton, which has a molecular weight of 83.80. If the mixing ratio of nitrogen is increased at a pressure lower than atmospheric pressure, the effect of suppressing the evaporation of tungsten in the filament will be drastically reduced, and the gas loss will increase, which has the disadvantage of reducing the efficiency and shortening the life of the bulb. Ta. Furthermore, when the concentration of nitrogen is increased, the gas pressure decreases due to the absorption of bulk getter, which also has the disadvantage of promoting arc generation.

In addition, a light bulb equipped with a highly active bulk getter eliminates the blackening of the glass bulb, which eliminates damage to the glass bulb due to blackening, which makes it possible to make the glass bulb smaller, but it also reduces the capacity of the glass bulb. Then, the absolute amount of nitrogen, etc. in the filled gas at a pressure lower than atmospheric pressure decreases, so the rate of decrease in the amount of nitrogen, etc. in the gas due to absorption of nitrogen, etc. by the bulk getter also accelerates, and filament breakage due to arc occurs in a short time. did.

(Problems to be Solved by the Invention) As mentioned above, incandescent light bulbs using conventional bulk getters use a mixture of rare gases such as argon and krypton and about 5 to 15% by volume of nitrogen, etc., at a pressure lower than atmospheric pressure. If the bulk getter absorbs nitrogen, etc., the filament will break due to arcing, and if the mixing ratio of nitrogen, etc. is increased, the efficiency of the bulb will decrease.

The drawback was that the lifespan was shortened. The present invention has been made to address the above-mentioned drawbacks of conventional incandescent light bulbs, and it is an object of the present invention to provide an incandescent light bulb having a bulk getter that is highly efficient and has a sufficiently long life.

[Structure of the invention]

(Means for Solving the Problems) The present invention accommodates a tungsten filament and a bulk getter in a glass bulb, and also fills one or more types of inert gas containing nitrogen at a pressure higher than atmospheric pressure. This is a characteristic incandescent light bulb.

(Function) The inventive hot bulb has a bulk getter of zirconium, tantalum, etc. in the glass bulb, and a bulk getter of zirconium, tantalum, etc. is provided in the glass bulb, and a bulk getter of argon, krypton, etc. containing nitrogen at a pressure higher than atmospheric pressure is placed inside the glass bulb. Filled with species or species. After the bulk getter is installed in a glass bulb, it becomes highly active by repeatedly energizing the filament in the forming gas and repeatedly injecting and discharging high-purity cleaning gas. For example, 50% of nitrogen, etc., is added to this highly active glass bulb.
By filling an inert gas such as argon containing 15% to 15% by volume above atmospheric pressure.

In addition to suppressing filament evaporation, it is possible to increase the partial pressure of nitrogen and other gases, thereby increasing the purity of rare gases such as argon, making it possible to make incandescent light bulbs smaller and higher output, and eliminating filament arcing. .

(Example) The details of the invention will be explained with reference to an illustrated embodiment.

The figure is a front view of one embodiment of the inventive incandescent light bulb in which the mount (3) is housed. The mount (3) has an inner lead (5) implanted in the stem (4), +5
) +6), 16) For example, the bulk getter above the tank has a plate thickness of 0.1
im+ It is a tantalum piece with a width of 2 m and a length of 5 m. (
8) is an anchor attached to the stem (4) that supports the double-coiled tungsten filament (2).

The stem (4) is a flexible glass bulb (1) not shown.
An exhaust pipe is attached to the stem (4).

One end of the exhaust pipe is opened in the stem (4) to form an exhaust hole (9). The α value is the base.

The sealed pulp, in which the flexible stem (4) of the mount (3) is sealed to the glass bulb (1), is evacuated via the exhaust pipe of the stem (4) and filled with, for example, argon or nitrogen 75
Forming gas with residual hydrogen added to the volume percent is introduced into the glass bulb, and the tungsten filament is heated to 2,500 K or higher by applying electricity. Thermal dissociation of hydrogen molecules (H2d 2 H102
, 7th/IT. 1) is actively carried out, and the highly reducing hydrogen atoms thus created reduce and clean the bulk getter connected to the tungsten filament, and the heat generated when the hydrogen atoms recombine heats the bulk getter. Subsequently, the process of introducing a high purity gas, such as a sealed gas, into the glass bulb and evacuating it to a degree of vacuum that does not reach zero molecular flow is repeated to remove the sucked impurity gas in the bulk getter and the glass bulb. Then, an inert gas containing nitrogen, such as a mixed gas of 90% by volume of argon and 1% by volume of nitrogen, is charged into the pulp (1) at a pressure of 1.5 to 9 f/m, and the exhaust pipe is sealed. By performing this evacuation process, the bulk getter of the light bulb operates satisfactorily during lighting.

The inventor has an outer diameter of 12.5711111. Inner diameter 11.5m
using a borosilicate glass bulb with an internal volume of 6 c, c
An incandescent light bulb as shown in the figure was manufactured and tested. 1 light bulb
00V57W double coil tungsten filament, bulk getter is tantalum with thickness 0.1mm + width 211L length 5mm, and argon 90% by volume as described above.
, gas pressure 1.5 kyf/
di (1.45 atm), and for comparison, a light bulb was manufactured in which the same gas was filled at a gas pressure of 0.9 kgf/C1l (0.87 atm).

When we conducted a 120V overvoltage life test, the gas pressure was 0.
．． In the case of 9f/cr/I, arc breakage of the filament occurred after 30 to 50 hours, but the gas pressure was 1.5k.
The gf/d inventive hot bulb has a design life of more than 100 hours.

The bulk getters used in the present invention include tantalum, zirconium, niobium, titanium, and thorium.

There are such things as Seto. Each of these has a different temperature at which impure gas is discharged and an optimum operating temperature, so it is necessary to select the wattage of the bulb and the location of the bulk getter. To manufacture an incandescent light bulb in which a glass bulb is filled with 1f11 or multiple types of inert gas containing nitrogen to a pressure higher than atmospheric pressure.

Is there a method in which a glass bulb filled with high pressure is cooled with K such as liquid nitrogen, the gas is condensed, and then the exhaust pipe is sealed by burning it with a burner? A method may be adopted in which six portions are provided and glass with a low softening temperature is provided in the narrowed portion to close it.

Since the incandescent light bulb of this invention has a high filler gas pressure, evaporation of the filament is sufficiently suppressed, and by increasing the partial pressure of nitrogen, etc., the purity of argon can be increased, making it possible to make light bulbs smaller and higher in output. Become. For example, if the filled gas pressure is 3 kg/7 (2.9 atm), argon will be 95
Even if the filament arc is reduced to % by volume, filament arc breakage does not occur, and the temperature rise of the glass bulb is reduced, so a filament of up to 85 W can be accommodated in the above-mentioned glass bulb with an inner diameter of 11.5 mm.

If the glass bulb is made smaller, the partial pressure of nitrogen, etc. will drop faster due to the consumption of the pulp getter, and there is a risk that the convection loss of the sealed gas will increase. Therefore, the outer diameter of the glass bulb should be adjusted in consideration of safety issues such as breakage of the glass bulb. 10 to 15 m
About x is preferable. In addition to nitrogen, the gas added for arc prevention may be hydrogen, but hydrogen has a large heat loss due to dissociation and conduction, so this is limited to special cases.

〔Effect of the invention〕

As detailed above, the present invention is characterized in that a tungsten filament and a bulk getter are housed in a glass bulb, and one or more types of inert gas containing nitrogen are filled at a pressure higher than atmospheric pressure. In an incandescent light bulb, it is now possible to use a tungsten filament, which is a bulk getter with high activity, without the risk of arc breakage, resulting in an incandescent light bulb with excellent movement percentage, and reducing the diameter of the glass bulb. This has the effect of providing an incandescent light bulb with high light efficiency without causing blackening of the glass bulb even if the glass bulb is made smaller.

[Brief explanation of the drawing]

The figure is a front view of one embodiment of the inventive incandescent light bulb. (1)...Glass bulb. (2)...Tungsten filament. (3)...Mount. (4)・・・Stem. (Power... bulk getter. (II......cap

Claims (1)

[Claims] An incandescent light bulb characterized in that a glass bulb contains a tungsten filament and a bulk getter, and is filled with one or more types of inert gas containing nitrogen at a pressure higher than atmospheric pressure.