JPS60151949A - Electrode of flash discharge lamp - Google Patents

Abstract

PURPOSE:To improve the service life of a flash discharge lamp by forming the electrode of this lamp by use of a porous metal substrate, which is made of calcined high melting point metal powders and which has a cone-shaped tip, impregnated with an electron emission material including alkaline earth aluminate. CONSTITUTION:In a bulb-shaped flash discharge lamp 1 used as the light source of a spectroscope, etc., a positive and a negative electrodes 2, 3 are formed as an impregnated type electrode 31 by the following method: The powders (1-8mu in the average diamerter) of high melting point metal, such as tungsten, etc., are press-formed, and then calcined in the atmosphere of hydrogen to make an electrode substrate with a porocity of 5-45%. This electrode substrate is made up of a cylindrical portion and a cone-shaped portion whose vertical angle theta at its top 31a is 20-100 deg.. By impregnating the electrode substrate with an electron emission material consisting of an alkaline earth aluminate which is a mixture of BaO-CaO.Al2O3 with a proper mole ratio, the impregnated type electrode 31 is formed. In this way, it is made possible to obtain a discharge lamp with a stable electrode having a peaked top which meets the requirements of high stability, high output power, and long life.

Description

[Detailed description of the invention] (Technology)! l'j') The present invention relates to an electrode for a Franche lamp discharge tube used as a light source for a spectrometer.

(Background of the Invention) Flash discharge tubes used as light sources for spectrometers and the like are known. FIG. 1 is a schematic diagram showing the structure of a bulb-shaped flash discharge tube. A cathode 2 is placed inside a cylindrical glass container 1.
and the anode 3 are supported by the stem introduction pin. The electrode 4 is an electrode called a trigger ``1-b'' which is provided to start and terminate the discharge.

Conventionally, cylindrical or prismatic electrodes as shown in FIGS. 2(a) and 2(b) have been used as the cathode and anode of this type of flood-l and discharge tube.

These electrode body parts 21 are made of W or M using an alkaline earth oxide as an electron-emitting material.

It is press-molded by mixing with a high melting point metal powder such as 45), and is connected to the lead-in wire 22, and is called a sintered electrode.

Is the lead-in wire integrally molded with the electrode main body 21? ? This is what I did.

In order for a flash discharge tube used as a light source, etc. for spectroscopy to be stable and to supply light output, it is necessary that the discharge position (discharge point) for each flash be constant and not fluctuate.

For this purpose i)! :If one part of the electrode is shaped like a circular peg, it will be difficult to move the discharge point.

However, with conventional electrodes, if the point where the discharge point occurs is concentrated at one point and made small, the load received there increases by V\c<, and the energy for each flash cannot be supplied sufficiently
The disadvantage was that the electrodes were worn out and the lifespan was extremely short.

11. is 1. llL viscous electrode, 1ylo, W, and other high melting point metal 151 powder as a heath, but the number of electrons! (It is not possible to occupy +3 Asahi with sufficient f gain by mixing and sintering an alkali oxide type electron hυIJ as one substance, which has a relatively low evaporation temperature.) This is Konokome.

For this reason, conventional methods have been used to prevent electrode wear and maintain a suitable lifespan.
), a discharge tube was manufactured using an electrode shaped as shown in FIG.

Due to the above-mentioned reasons, it is not possible to construct a circle 11 part for stable discharge, and it is extremely difficult to create a Fura-7 discharge tube that satisfies the requirements of high stability, high output, and long life. Met.

(Objective of the invention) The object of the present invention is to solve the previous problem by 1! l? It is an object of the present invention to provide an electrode for flash discharge that can be used in a decisive manner.

(Structure of the Invention) In order to achieve the above object, the flash discharge electrode according to the present invention has a high surface; It is constructed by impregnating an electron number f1/11 cap containing alkaline soil.

(Description of Examples) Hereinafter, the present invention will be further described with reference to the drawings and the like.
explain.

FIG. 3 is a diagram showing an embodiment of an electrode for discharging on a flange according to the present invention.

After press-molding a high melting point total bending powder with an average particle size of 1 to 8μ as an electrode substrate, it is heated in a hydrogen atmosphere or in a vacuum for 2 (
] +00℃~2G O (5~45' sintered at 1c
The porosity of M is 1, and the porosity consists of a cylindrical part and a conical part.
A metal substrate is formed at 11.!+45: r<, 13 a C in this porous metal substrate.
1-Ca O' Alkaline aluminate IJ mixed with 20J of A I in an appropriate molar ratio
A so-called d-type electrode 31 is immersed in a radioactive material.
form.

The porous metal substrate can be made of tungsten powder (>1, which is already used).

Metals such as tungsten, molyftene, and tankle can also be used, or a mixture of these metals can be used.

In the plane that extends λ from the central axis of the electrode, the circle i1 “tip of the shape ζ
'R5ill: + day, 10 so, ψ゛7 angle θ? i:2
0° or more''- and 100' or less (・ko-21-ro.

This 6L-shaped electrode formed by U7 in [) is similar to the conventional one. ′, unlike the shape city pole, the outline, ρ) high melting point metal wa) Song fl' + body high' (A!, teJ, (°L can be used, the tip of a strong conical shape -1 , 1i book~Omorita I1
．． There are 1-+1 metal groups (Jt=).

Then, the electrode has a structure in which the 3D agent is filled in the 1.% gold base, so the electrode is not very stable.
It has a structure that is resistant to damage.

Here, 1. Adjust the angle of the tip by 20° to 100"G,
(The reason for this is that even if the structure is strong, if the angle exceeds 20', the first part may be worn out.

On the other hand, if the angle exceeds 100°, the effect of the shape of the circle will be reduced because the discharge point will not be stable.

When the porosity was set in the range of 5 to 45%, 11. If the porosity was less than 5%, the existing pores would not be completely connected, and the electrode tip, I, i:; This is because there is a possibility that the impregnating agent will not be used properly. If the impregnating agent is insufficiently supplied to the electrode tip r4j, it will not be possible to obtain the proper electric radiation characteristics, and the arc will become unstable.
There is a possibility that the electrode wears out rapidly - I)
Ru.

On the other hand, when the porosity exceeds 45%, the void t'L or poly'J"
This is because the evaporation of the impregnating agent becomes extremely large, causing the inner wall of the Harz to become black, which may lead to a decrease in light j(':) due to a decrease in transmittance.

The reason why the average 1°I'L diameter was defined as 1 to 33μ is because small grains tend to form high L-coalesce, and the relationship between hot carp and 11) is very important. ．． If it becomes 7, then Ijb
This is because 1l11'i advances too much, leading to problems such as the porosity not being constant. On the other hand, if the grain is too large, 91!1 degrees must be added to the required area.It is not possible to make the temperature extremely low. It is circular, and it is inconvenient for the maintenance of the sintering furnace.It is also a disadvantage that the empty rL is not constant.

L'), + at the -1 point; +1. ■The W is crushed 7. So-seven power using the electrode according to the present invention, lik electric M;・
The J'JII' mouth opening 1 is compared to the conventional electronics (J'JII') and the present invention. 1, 4 electric tMj
The formation of is as follows.

Experimental Example 1 Direction of electrode f3-1) -2,0m + Summer 1 Denda Rizuki - Yusa 1. -++, Om + tip of n electrode -? 1j, 1 angle θ-25° Porous y′L metal antagonist cable (・1 tungsten porosity 25% included??JJl’ BaO-Ca0-A/!2 o3)
Alkali aluminate mixed in a reasonable molar ratio (31゛)
An example of an electron-emitting material made of ■ Electrode diameter D = 2. (l m m electrode length
L = 3.0 mm Angle of the tip of the electrode θ-・05° Porous metal substrate element (71 Tungsten porosity 25% Contains C'rA13a o -Cao・Δ(220:3 at an appropriate molar ratio) The electrode of the radioactive substance Experimental Example I is used as an anode for the mixed alkali aluminate containing J and Q.
'ii.

Tips of these electrodes,, j, l; between j, lp qlt, fl, (Iff to l m m: -) - (, i\2
A xenon gas discharge tube of about 6 (lOl·-l) is made by placing it in a Kernos tube with a length of 8 nm and a length of 3 Q + n.

A lighting test was conducted with an applied voltage between both electrodes (1) C1 (1 (10 V, input voltage per pulse i-:j; 0.1 Joule, lighting cycle 100 II Z).

Assuming that the basis rla of tF 1illi for the movement of the discharge point is −ζ
The luminous flux stability S is used.

The luminous flux stability S is expressed as follows.

The luminous flux stability S is determined by projecting a 1]'-reflection image, inserting a slit into the center of the arc projection image, and measuring the fluctuation of the light beam passing through the arc projection image.

S (%) = ((Imax -1m1n) / 1
1nax) x 100 (%) Goko (101・+x1.J, maximum light intensity, 1r1 mountain 1st, 1 minimum light intensity 7°,.

A・It l/,′,: Constant jj2 S or small culm shows that the movement of the point is small.

(): 1 record, 1 example 1-ζ is the number of flashes until 50% reduction in initial light output during the noj order 1 t) ” arc stability over the pulse 5 (111,0,6 to 1. It was extremely low at 2%, indicating high stability.

Experimental Example If C1:1 gave substantially the same results as 1!7.

In this example, 0.6 to 1.2% over a long period of life.
This makes it possible to create an extremely stable lamp.

Using a conventional sintered electrode (with the shape shown in Figure 2) and keeping all other conditions the same (see below for those subjected to the Gino life test), the results were compared to blue 50 of light output
Flash dazzling to % drop was approximately 107 pulses.

The arc stability S of the light output per flash is (j~10
It was about %.

(Description of Effects) As explained above, the electric J! ζ is 1M high
j! EM circle 11r, form 7:
; jj Z, + porous metal base impregnated with alkali aluminate" - cheek amming electron / 19 °
・I4. (Impregnate it, it will be 2 or 1ζ.

When a flash discharge tube (I111) is constructed using this electrode, a flash discharge tube is produced which exhibits high stability and has a long life.

[Brief explanation of drawings]

Fig. 1 is a diagram that does not show an example of the configuration of a conventional Flanow-Yu discharge tube, and Fig. 1 (a) is an A-AIJJi view of Fig. 5 (b). A diagonal diagram showing the structure of the electrodes of a flash discharge tube.・Crow η 2...Yin 1 U1 ;)...++, 1.j, l:T+ζ 4...1 Rigazo 1,1-bu 5...So, -)-ノ, introduction bin 21・... l, +'L hook-shaped electrode 22... Ancient person Ij1j 31... Including l (form voice 1, p: 32...+1-1, Flj;! Erection applicant β (Matsupoto-2) °-kusu (! (Set-up company agent: /j゛Physician No. 1 No. 1-1 Hisashi 1 Figure 2' 2 Figure 3 Figure 1

Claims (4)

[Claims] (1) Sintering high melting point metal powder ☆1) 1 is yen! The electrode of this flash discharge tube has an IL-like porous structure (a metal substrate is impregnated with an electron beam containing an alkaline earth aluminate). (2) Sinter the height 1+j'L point metal 4'5 to the point α
11.1 is a circle T
'I'i' + i'l, which is sintered with a void rL ratio of
Beg! 11, range λ of the flash discharge device described in item 1). (3) Poly[”j total flexion base le, two impregnated −1,!c゛,・
Relo electron emission (1 is l(XICJ -1',) ;I
O・/\120 J - (: Certain patent claim 0') ii
i! Flood of the 21st Ji note = electrode of hk electric τi. (4) The electrode for a flash discharge tube according to claim 3, wherein the angle of the tip of the discharge 1 te 1 including the center line of the electrode is within the range of 2()° to 1100''.