JPS5975553A - Electrode for discharge lamp - Google Patents

Abstract

PURPOSE:To improve electron radiation capabilities by containing 0.05-5wt% of extremely fine powders of at least one of nickel, iron, and cobalt in an electron radiating material containing an alkaline earth metal including at least barium. CONSTITUTION:Argon and mercury is sealed in a discharge tube 1 made of glass, electrodes 2a, 2b are arranged on both sides of the discharge tube 1, and the glass inside of the discharge tube 1 is coated with a phosphor 3. Tungsten coils are coated with an electron radiating material made by mixing 0.05-5wt% of extremely fine powders of at least one of nickel, iron, and cobalt to an electron radiating material containing an alkaline earth metal including at least barium to form the electrodes 2a, 2b. Thereby, the conductivity of the electron radiating material is increased and the adhesiveness to the electrode can be improved. As a result, a discharge lamp electrode excellent in electron radiation capabilities can be produced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies IA to an electron emitting material applied to an electrode installed in a radiation lamp.

As an example of this discharge lamp, the structure of a fluorescent lamp is shown in FIG. Argon and mercury are sealed inside the glass discharge y+it, and electrodes (2a) (2b) are placed at both ends of the tube.
is set, and a phosphor (3) is installed in the glass curve of the discharge tube (11).

Traditionally, fluorescent lamps are made by coating a tungsten coil with an electron-emitting substance containing baritum, strontium, and calcium carbonate salts, and adding zirconium chloride to the carbonate group during the lamp manufacturing process. It is calorically heated and decomposed into oxides such as barium oxide.This conventional electron-emitting material is reduced by tungsten, which is the electrode base, when the lamp is turned on, and barium oxide (Bad) is converted to barium (Bad) by the reaction of 6BaO+ W-+Ba3WO6+ JBa. Ba) i is produced. This barium contributes to the release of children, but some of it is scattered between the discharge plants and attached to the wall, and if the amount is large, ,i
Causes blackening. Zirconium oxide is boxed in the above material to suppress the blackened gold in this tube S'111f. As a result, the blackening of the tube end is slightly reduced.

Not enough. This is because the scattering of Ba was suppressed to a small extent by the dual force U of zirconium oxide, but as the lamp lighting time elapsed, the acclimatized barium and zirconium oxide = f) reacted, and barium and zircon I [ff1 (Ba Zr
Oa)k is formed, and as a result, the ductility of the coating film decreases, and as a result, the ``repellency'' decreases, and ``scattering from the electrode increases, which also leads to blackening of the surface.

This clarification was made in response to the drawbacks of the conventional method, and the electron-emitting materials used were nickel and iron.

At least one type of ultrafine cobalt powder'i 0.05~
By incorporating 5% by weight of the electron emitting material, the adhesiveness and conductivity of the electron emitting material are improved, and an electrode for a discharge lamp with less edge blackening is provided.

Examples of the present invention and conventional examples will be explained below. First, as a conventional example, barium oxide (BaO) 55: & fish chi,
1JL complete set for fluorescent lamps with electron emitting material containing strontium oxide (SrO) 28i and calcium oxide (Cab) ternary oxides and zirconium oxide (Zr02) 4x'jjL% 40W
Created a fluorescent lamp. Note that the above '-pole is usually 8,
Barium, strontium, and calcium charcoal zirconium chloride are mixed together, put into a nitrocellulose lacquer together with this purple nitrocellulose lacquer, and ball milled to form a suspension. The above conventional 40W
When the lighting test of the source lamp was completed, the luminous flux maintenance rate after 3000 hours of lighting was 85%.

Next, to explain this invention in detail, barium oxide (Ba
d) Approximately 55m: It%, strontium oxide (SrO)
Approximately 28 times the ternary oxide and calcium oxide (Cab) and zirconium oxide (ZrOz)
Approximately 4N amount of ``one-leaf excretion substance'' which is made by adding nickel powder of 300 average grains of fleas to each government-owned ``flea release substance'' in each house.A 40W light lamp is lit. Inside,
I conducted a lighting test using the conventional example above and a colleague.

The results are shown in the table below.

From this table, conventional Bad, SrO, Cab, Zr
It can be seen that the fluorescent lamps using the electron emitting material shown in Examples 2 to 4 have superior luminous flux maintenance rates as compared to the fluorescent lamps using the electron emitting material made of O2.

The reason why the luminous flux maintenance factor of the example is excellent as described above is presumed to be due to the following reason. That is, in the conventional electron emitting material described above.

The reaction between ZrO□1dBao and tungsten of the electrode base is completely suppressed, and the production of Ba is completely controlled. As a result, Ba
Dispersion to the amount of discharged seedlings is reduced.

However, +BhO and ZrO□ react to form BaZ
rO3 is formed, the stability of the military radioactive substance gradient film decreases due to 7, the electron radioactivity decreases due to -f, and the scattering of electron emissive substances from the electrode increases, As expected, tube wall blackening V
(Connect.

On the other hand, the electron emitting material of the present invention is characterized by the addition of fine Ni powder kR'i. The addition of Ni imitation powder not only improves the effectiveness of the electron emitting material, but also improves its adhesion to the electrode substrate, which stabilizes Ba production during lamp lighting and maintains electron emission well. Because it sag, the growth ridges to f& are reduced.

The amount of nickel powder to be mixed is preferably 0.05 to 5%. When the above amount is less than 0.05% by weight, N
1 powder fathom? The effect as a JE agent is small, and the above amount is 5
If it exceeds % by weight, the electron radioactivity decreases due to surface oxidation of the yuH1 powder.

In the above practical application example, an example was shown in which an ultrafine nickel powder was used, but is it iron or cobalt U-bed? Even when used, the same effect can be obtained.

It is also acceptable if the semi-uniform grain size of these powders is 0.2 microns or less.

Also, at soil id, X application 0, BaO* 8rO+ Ca
Although the electron emitting material made of O*ZrO2 has been shown, the invention is not limited thereto (
O, HaO-CaO-B & O, B a2 (,',
a WO6, B 1k1-B Srg, 2 CaW
These include various types of Ba-containing materials such as 06 that can be used as electron-emitting materials.

Also, the actual HL above! Although the example shows a fluorescent lamp, it can also be applied to other discharge lamps, such as high-pressure mercury lamps, high-pressure sodium lamps, etc.

As mentioned above, this invention is applicable to at least barium'(
+- Miyahi alkaline earth gold) 84 All contained electron emitting substances include at least one of ultrafine powders of nickel, iron, and cobalt.
By mixing the ridge with 0.115 to 5 mJt%, it is possible to increase the electroconductivity of the electron emitting material and improve its contact with the nine electrodes. ′
It is provided by an electric car for city lights.

[Brief explanation of the drawing]

The figure shows the configuration of a fluorescent lamp. In the figure, (2m) and (2b) are 'widths. Agent Kuzu! 1!7- Others-

Claims (1)

[Claims] It is characterized by having an electron emitting material which is made by combining an electron emitting material containing an alkaline earth metal containing at least barium with at least one super-rugged wood of nickel, iron, and cobalt. -1 love for discharge lamps.