CN1141729C - Cathode used in electron gun - Google Patents
Cathode used in electron gun Download PDFInfo
- Publication number
- CN1141729C CN1141729C CNB981021786A CN98102178A CN1141729C CN 1141729 C CN1141729 C CN 1141729C CN B981021786 A CNB981021786 A CN B981021786A CN 98102178 A CN98102178 A CN 98102178A CN 1141729 C CN1141729 C CN 1141729C
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- China
- Prior art keywords
- cathode
- electron gun
- nickel
- metal
- metal level
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/04—Cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/26—Supports for the emissive material
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- Solid Thermionic Cathode (AREA)
Abstract
The invention relates to a cathode for electron gun to attain a long service life under a high current density load by maintaining an after-diffusion route especially for a reducing element contained in the base metal and smoothly generating a barium free radical. A metallic layer mainly composed of nickel is formed on top of a base metal mainly composed of nickel and formed to contain at least one type of a reducing element, an alkaline earth metal oxide layer at least containing barium is formed on top of the metallic layer.
Description
Technical field
The invention relates to the cathode for electron gun that is used for cathode ray tube, particularly about the reproducibility elemental diffusion path of guaranteeing to help to generate the barium free radical, can under the high current density load, realize long-life cathode for electron gun.
Background technology
Cathode ray tube is after the electronics that will radiate from electron gun quickens with high voltage, to make it depression (landing) on the fluorophor of screen, the device of the excitation luminescence display image by this fluorophor.
Shown in Figure 6 is the general structure that is used for the cathode for electron gun of electronic emission in such cathode ray tube.The inside of figure middle sleeve (sleeve) 2 is provided with heater (heater) 4, being provided with nickel (Ni) thereon is the silicon (Si) that contains trace of principal component and the lid shape parent metal 6 of the such reproducibility element of magnesium (Mg), be provided with thereon with the alkaline earth oxide that contains barium at least be principal component electricity radiogen layer 8.
The oxide coated cathode of She Zhiing is the energy with the heat that sends from heater like this, and metal oxide and reducing metal react, and utilizes the barium free radical radiation hot electron in this generation.The electronic emission ability of above-mentioned cathode for electron gun is decided according to the quantity delivered of the barium free radical that exists in the metal oxide.But recently, therefore the trend that cathode ray tube has height to become more meticulous and maximizes require exploitation that the negative electrode of barium free radical can be provided under high current density for a long time.
The applicant in first to file, Republic of Korea openly speciallys permit communique and discloses for 96-15634 number, make and in containing the electronic emission material layer of alkaline earth oxide, further contain lanthanum (La) compound and magnesium (Mg) compound simultaneously, perhaps contain lanthanum-magnesium complex chemical compound, the negative electrode that consumes with the evaporation that suppresses the barium free radical.
But above-mentioned negative electrode generates the intermediate layer of being made up of reaction product 10, as shown in Figure 7 at 2～3A/cm between the interface of parent metal 6 and electronic emission material layer 8
2High current density under will cause the lost of life.
The barium free radical that generates by reaction equation 1 and reaction equation 2 helps electronic emission, resembles MgO and Ba but produce thereupon
2SiO
4Such product forms intermediate layer 10 on the interface of parent metal 6 and electronic emission material layer 8.
The intermediate layer 10 of Xing Chenging becomes the barrier layer like this, hinders the later stage diffusion of contained reducing agent in the parent metal 6, makes the reaction of formation that needs the barium of reducing agent free radical become difficult, thereby makes the lost of life of negative electrode.In addition, also exist, thereby hinder the mobile of electronic emission electric current, the problem of the current density that restriction can be radiated because above-mentioned intermediate layer 10 has high resistance.
On the other hand, day disclosure special permission communique disclose for flat 3-257735 number between parent metal and electronic emission material layer, be provided with have with silicon, magnesium is identical or the metal level of lower but higher than nickel reproducibility, in above-mentioned electronic emission material layer, contain rare-earth oxide, with this rare-earth oxide decomposition reaction product, make the reproducibility element of above-mentioned metal level help the cathode for electron gun of the generation of barium free radical.
But above-mentioned negative electrode further forms additional reaction product when generating the barium free radical, though use initial performance stable, As time goes on, exists the problem that the life-span sharply descends.
Summary of the invention
The objective of the invention is,, realize the generation of barium free radical smoothly, thereby be implemented in the long-life under the high current density load by guaranteeing the later stage the evolving path of contained reducing agent in the parent metal.
As the means that realize above-mentioned purpose, the invention provides is being principal component with nickel, at least contain above a kind of parent metal of reducing metal, the metal level that principal component is nickel or nickel-zirconium is set, the cathode for electron gun of the electronic emission material layer that contains the alkaline-earth metal oxide layer that contains barium at least is set above the metal level at this.
At this, the present invention's metal level is coating nickel or nickel-zirconium on parent metal, and this is heat-treated, and perhaps adheres to nickel or nickel-zirconium powder end and obtains, and is provided with to make it have the particle diameter littler than the average grain diameter of above-mentioned parent metal.
In addition, the present invention also is included in and is provided with the structure that contains lanthanum compound and magnesium compound simultaneously or contain the second electronic emission material layer of lanthanum-magnesium complex chemical compound in the alkaline earth oxide that contains barium at least on the above-mentioned electronic emission material layer.
Pass through said structure; among the present invention; the metal level of being made up of the particle littler than parent metal particle disperses the intermediate layer as reaction product effectively; prevent to generate the intermediate layer of resistive formation; guarantee the path of reducing metal; help the later stage diffusion, thereby keep reaction of formation constantly, realize 2～3A/cm the desired barium free radical of above-mentioned reducing metal
2High current density load under long-life.
Description of drawings
Fig. 1 is the sectional drawing of the cathode for electron gun of one of embodiment of the invention.
The amplification profile diagram of the major part of the cathode for electron gun of one of Fig. 2 embodiment of the invention.
Fig. 3 is the life characteristic of the cathode for electron gun of one of embodiment of the invention.
Fig. 4 is the sectional drawing of cathode for electron gun of another embodiment of the present invention.
Fig. 5 is the life characteristic of cathode for electron gun of another embodiment of the present invention.
Fig. 6 is the sectional drawing of disclosed cathode for electron gun in the past.
Fig. 7 is the amplification profile diagram of disclosed cathode for electron gun in the past.
Being described as follows of symbol:
6 parent metals
8 electronic emission material layers
10 intermediate layers
12 metal levels
80 the 2nd electronic emission material layers
Embodiment
Below, the illustrated embodiments that realizes the present invention is illustrated with accompanying drawing.As a reference, in explanation of the present invention, for the identical part of part of using the figure that quotes from technology in the past to describe, for keeping clear property, use prosign.
Embodiment 1
The cathode for electron gun of one embodiment of the present of invention of Fig. 1 is located at the upside peristome that has been provided with the sleeve pipe 2 of heater 4 in inside, and comprises the parent metal 6 of lid shape of reducing metal that contains with Ni for example Si, the Mg that are principal component and trace.
The metal level of being made up of pure Ni or Ni-Zr 12 is set on parent metal 6, triplex carbonate (BaSrCa) CO is set at an upper portion thereof by the alkaline earth oxide that contains barium at least again
3Or double carbonate (BaSr) CO
3The electronic emission material layer of forming 8.
Present embodiment is when generating the barium free radical, and the scheme of the reaction product that Mg is arranged as the BaO on the interface that disperses to be accumulated in parent metal 6 and electronic emission material layer 8 and Si is provided with by pure Ni or the molecular metal level 12 of Ni-Zr particulate on its interface.
The metal level 12 of present embodiment is shown in Fig. 2 amplification, make it to have the particle diameter littler when being provided with than the average grain diameter of parent metal 6, because contained reproducibility elemental diffusion path itself is disperseed in the parent metal 6, carry out many places in the particle that is reflected at metal level 12 of BaO and Si and Mg, interbed 10 is disperseed among its reaction product, accumulation is inhibited, and is smooth as the diffusion of Si, the Mg of reproducibility element, thereby helps the generation of barium free radical.In addition, the composition of above-mentioned metal level 12 is pure Ni or Ni-Zr, and is identical with parent metal 6, compares with the metal level of in the past coating W, do not generate the intermediate layer as reaction product.
For this reason, the metal level 12 of present embodiment is with sputter (sputtering) method Ni or the Ni-Zr that thickness is 200～20000 dusts to be set on parent metal 6, it is heat-treated under 700～1100 ℃ in inert atmosphere or vacuum atmosphere, make it that alloying and diffusion obtain between parent metal 6 and metal level 12.
The thickness of metal level 12 is advisable with 200～20000 dusts, as at 200 dusts with next too thin, the path that is difficult to guarantee the reproducibility element then can hinder the diffusion of reducing metal more than 20000 dusts.On the other hand, the thickness of the metal level 12 of present embodiment is best example, is 3000～10000 dusts.
On the other hand, the metal level 12 of present embodiment Ni or the Ni-Zr powder setting that on parent metal 6, is covered.The coating method of this moment can be realized by the method for physics such as spraying (spray) method, print process, electrolytic deposition method and metal salt solution method, chemistry, machinery.
On the metal level 12 of such setting, with common spray-on process triplex carbonate or the double carbonate that thickness is 20～80 μ m is set, the gross thickness of the negative electrode of present embodiment is below 200 μ m like this.
Embodiment 2
The cathode for electron gun of the 2nd embodiment of the present invention provides the scheme with the electronic emission material layer of the 2nd electronic emission material layer alternate embodiment 1.
With reference to Fig. 1 present embodiment is illustrated, on the metal level of forming by pure Ni or Ni-Zr 12,, is arranged on triplex carbonate (BaSrCa) CO as the alkaline earth oxide that contains barium at least
3Or double carbonate (BaSr) CO
3In further contain lanthanum compound and magnesium compound simultaneously or contain the 2nd electronic emission material layer 80 of lanthanum-magnesium complex chemical compound.
Above-mentioned lanthanum compound and magnesium compound or lanthanum-magnesium complex chemical compound is the evaporation that suppresses the barium free radical, enables to supply with constantly the barium free radical, is the best with 0.01～1 weight % that accounts for carbonate weight.
Its content is as below 0.01 weight %, the having little effect of the inhibition barium free radical during driving, and as reach more than the 1 weight % electronic emission characteristic in the time of then can driving at the reduction initial stage.
Therefore, according to present embodiment, in the time of with the effective peptizaiton in 12 pairs of intermediate layers 10 of metal level, the evaporation of the barium free radical that is generated by the reaction of BaO and Si and Mg is subjected to the inhibition of the 2nd electronic emission material layer 80, thereby has prevented the sintering of metal oxide.
The metal level 12 of present embodiment is that coating thickness is the Ni or the Ni-Zr of 200～20000 dusts on parent metal 6, and this is heat-treated in inert atmosphere or vacuum atmosphere, makes it that alloying and diffusion obtain between parent metal 6 and metal level 12.The metal level 12 of present embodiment Ni or the Ni-Zr powder setting that on parent metal 6, is covered.
On the metal level 12 that is provided with like this, with the spray-on process coating thickness is further containing lanthanum compound and magnesium compound simultaneously or contain the second electronic emission material layer 80 of lanthanum-magnesium complex chemical compound in triplex carbonate or double carbonate of 20～80 μ m, and the gross thickness of the negative electrode of present embodiment is no more than 200 μ m.
The cathode for electron gun of present embodiment is assembled into cathode ray tube, checks its life-span, the result as shown in Figure 3.A contains lanthanum-magnesium compound 0.5 weight % among the figure in the carbonate, is provided with thickness and is the negative electrode of present embodiment of the metal level 12 of 3000～5000 dusts.B contains lanthanum-magnesium compound 0.5 weight % among the figure in the carbonate, and the oxide coated cathode of metal level 12 is not set.C is an oxide coated cathode in the past among the figure.
Life-span checks it is the reduction of measuring the electronic emission electric current under the state of driving in continuous 6000 hours, and each negative electrode is implemented with the electric current of 2000～3000 μ A.Its result, the present invention's cathode for electron gun is compared with the B of conventional art, C, and the life characteristic under the high electric current significantly improves.Specifically, the present invention yet kept 90% of initial stage current value after 6000 hours under the driving of high current density.
Embodiment 3
As shown in Figure 4, the cathode for electron gun of the present invention the 3rd embodiment is on parent metal 6, the metal level 12 that setting is made up of pure Ni or Ni-Zr, the electronic emission material layer of being made up of triplex carbonate that contains barium at least or double carbonate 8 is set thereon, is arranged on the 2nd electronic emission material layer 80 that further contains lanthanum compound and magnesium compound simultaneously in the triplex carbonate that contains barium at least or the double carbonate or contain lanthanum-magnesium complex chemical compound thereon again.
Present embodiment is to consider in the foregoing description 2, and contained reproducibility element promotes the reduction of barium free radical simultaneously in reproducibility element of being made up of Ni or Ni-Zr and the parent metal 6, and the evaporation of barium free radical can excessively be carried out.
In the present embodiment, the scheme of BaO that the carbonate thermal decomposition that accumulates from the interface at parent metal 6 and electronic emission material layer 8 as dispersion goes out and the reaction product of Si or Mg is provided with the metal level of being made up of pure Ni or Ni-Zr 12 between its interface.
In addition, present embodiment is arranged on the 2nd electronic emission material layer 80 that contains lanthanum compound and magnesium compound in the carbonate simultaneously or contain lanthanum-magnesium complex chemical compound 0.01～1 weight % as the scheme of the evaporation consumption of the barium free radical that suppresses electronic emission material layer 8.
For this reason, the metal level 12 of present embodiment is that coating thickness is the Ni or the Ni-Zr of 200～2000 dusts on parent metal 6, this is heat-treated in inert atmosphere or vacuum atmosphere, make it that alloying and diffusion obtain between parent metal 6 and metal level 12.At this, the thickness of the metal level 12 of present embodiment is considered the electronic emission material layer 8 of setting thereon and the thickness of the 2nd electronic emission material layer 80, is advisable with 200～2000 dusts, and best example is 400～1200 dusts.On the other hand, the metal level 12 of present embodiment adheres to Ni or the setting of Ni-Zr powder on parent metal 6.
Coating thickness is the electronic emission material layer of being made up of triplex carbonate or double carbonate 8 of 20～80 μ m on the metal level 12 that forms like this, coating thickness is further containing lanthanum compound and magnesium compound simultaneously or contain the 2nd electronic emission material layer 80 of lanthanum-magnesium complex chemical compound in triplex carbonate or double carbonate of 20～80 μ m more thereon, make gross thickness be no more than 200 μ m, can make the cathode for electron gun of present embodiment like this.
The cathode for electron gun of above-mentioned present embodiment is assembled into cathode ray tube, checks its life-span, the result as shown in Figure 5.D is provided with the metal level 12 that thickness is 400～1200 dusts among the figure, and electronic emission material layer 8 is set thereon, is provided with the negative electrode of the present embodiment of the carbonate that contains lanthanum-magnesium compound 0.5 weight % thereon again.E is an oxide coated cathode in the past among the figure.
Life-span checks it is the reduction of measuring the electronic emission electric current under the state of driving in continuous 6000 hours, and each negative electrode is implemented with the electric current of 2000～3000 μ A.Its result, the present invention's cathode for electron gun is compared with technology in the past, and the life characteristic under the high electric current significantly improves.Specifically, the present invention yet kept 95% of initial stage current value after 6000 hours under the driving of high current density.
Also have, the present invention's negative electrode has shown from driving maximum cathode current (the maximum cathode current at initial stage; The maximum current that goes out from cathode emission under certain condition) elapsed time is long more, the tendency that maximum cathode current increases.
Shown in above embodiment, the present invention's cathode for electron gun has solved the problem of conventional art in fact.Promptly; structure of the present invention is to be provided with between parent metal that contains the reproducibility element and the electronic emission material layer be made up of carbonate by the molecular metal level of particulate; the reaction product that takes place when disperseing to generate the barium free radical; guarantee the later stage the evolving path of reproducibility element, thereby can realize radiating constantly the barium free radical.
In addition, the present invention contains lanthanum compound and magnesium compound simultaneously or contains lanthanum-magnesium complex chemical compound in the electronic emission material layer, perhaps be provided with the 2nd electronic emission material layer that contains lanthanum compound and magnesium compound simultaneously or contain lanthanum-magnesium complex chemical compound, thereby can suppress the evaporation consumption of barium free radical.
Therefore, according to the present invention, the interaction by metal level and electronic emission material layer or the 2nd electronic emission material layer makes that the radiation of barium free radical is continued, and evaporation consumes and is inhibited, thereby at 2～3A/cm
2High current density load also can obtain to improve the effect of life characteristic down.
In addition, the present invention's oxide coated cathode though be the thing of keeping the long-life under high current density, also has the practicality of the impregnated cathode that replaces manufacture method difficulty, high price.
On the other hand, the present invention is not limited to above-mentioned best invention, and in the scope of the desired summary of patent claims, as long as the field has the people of general knowledge under the present invention, who can be to implementing in addition diversified change.
Claims (21)
1. cathode for electron gun, it is characterized in that comprising with nickel to be principal component, at least the principal component that contains a kind of parent metal of reducing metal and be provided with in the above is the metal level of nickel, is provided with the electronic emission material layer that comprises the alkaline-earth metal oxide layer that contains barium at least above the metal level at this.
2. cathode for electron gun according to claim 1 is characterized in that, metal level is made up of nickel or nickel-zirconium.
3. as the cathode for electron gun as described in claim 1 or the claim 2, it is characterized in that metal level is by coating nickel or nickel-zirconium on parent metal, and this is heat-treated and obtains.
4. as the cathode for electron gun as described in the claim 3, it is characterized in that metal level is made up of the particle littler than the average grain diameter of parent metal.
5. as the cathode for electron gun as described in claim 1 or the claim 2, it is characterized in that metal level is by adhering to nickel or nickel-zirconium powder end is provided with on parent metal.
6. as the cathode for electron gun as described in the claim 5, it is characterized in that metal level is made up of the particle littler than the average grain diameter of parent metal.
7. cathode for electron gun according to claim 1 is characterized in that, metal layer thickness is 200～20000 dusts.
8. cathode for electron gun according to claim 1 is characterized in that, the electronic emission material layer further contains lanthanum compound and magnesium compound simultaneously, or contains lanthanum-magnesium complex chemical compound.
9. as the cathode for electron gun as described in the claim 8, it is characterized in that metal level is made up of nickel or nickel-zirconium.
10. as the cathode for electron gun as described in claim 8 or the claim 9, it is characterized in that metal level is by coating nickel or nickel-zirconium on parent metal, and this is heat-treated and obtains.
11. the cathode for electron gun as described in the claim 10 is characterized in that metal level is made up of the particle littler than the average grain diameter of parent metal.
12. the cathode for electron gun as described in claim 8 or the claim 9 is characterized in that, metal level is by adhering to nickel or nickel-zirconium powder end is provided with on parent metal.
13. the cathode for electron gun as described in the claim 12 is characterized in that metal level is made up of the particle littler than the average grain diameter of parent metal.
14. the cathode for electron gun as described in the claim 8 is characterized in that metal layer thickness is 200～20000 dusts.
15. cathode for electron gun according to claim 1, it is characterized in that, on described electronic emission material layer, be provided with the 2nd electronic emission material layer, the 2nd electronic emission material layer comprises the alkaline earth oxide that contains barium at least and contains lanthanum compound and magnesium compound simultaneously, or contains lanthanum-magnesium complex chemical compound.
16. the cathode for electron gun as described in the claim 15 is characterized in that metal level is made up of nickel or nickel-zirconium.
17. the cathode for electron gun as described in claim 15 or the claim 16 is characterized in that, metal level is by coating nickel or nickel-zirconium on parent metal, and this is heat-treated and obtains.
18. the cathode for electron gun as described in the claim 17 is characterized in that metal level is made up of the particle littler than the average grain diameter of parent metal.
19. the cathode for electron gun as described in claim 15 or the claim 16 is characterized in that, metal level is by adhering to nickel or nickel-zirconium powder end is provided with on parent metal.
20. the cathode for electron gun as described in the claim 19 is characterized in that metal level is made up of the particle littler than the average grain diameter of parent metal.
21. the cathode for electron gun as described in the claim 15 is characterized in that metal layer thickness is 200～2000 dusts.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR79095/1997 | 1997-12-30 | ||
| KR79095/97 | 1997-12-30 | ||
| KR1019970079095A KR100268243B1 (en) | 1997-12-30 | 1997-12-30 | Cathod used in an electron gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1221965A CN1221965A (en) | 1999-07-07 |
| CN1141729C true CN1141729C (en) | 2004-03-10 |
Family
ID=19530030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981021786A Expired - Fee Related CN1141729C (en) | 1997-12-30 | 1998-05-27 | Cathode used in electron gun |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH11204021A (en) |
| KR (1) | KR100268243B1 (en) |
| CN (1) | CN1141729C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6495949B1 (en) | 1999-11-03 | 2002-12-17 | Orion Electric Co., Ltd. | Electron tube cathode |
| CN100336154C (en) * | 2000-09-19 | 2007-09-05 | 皇家菲利浦电子有限公司 | Cathode ray tube having oxide cathode |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR970073246A (en) * | 1996-04-26 | 1997-11-07 | 배순훈 | Printed circuit board (PCB) inspection apparatus and method thereof |
-
1997
- 1997-12-30 KR KR1019970079095A patent/KR100268243B1/en not_active IP Right Cessation
-
1998
- 1998-04-23 JP JP12963298A patent/JPH11204021A/en active Pending
- 1998-05-27 CN CNB981021786A patent/CN1141729C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR19990058910A (en) | 1999-07-26 |
| KR100268243B1 (en) | 2000-10-16 |
| CN1221965A (en) | 1999-07-07 |
| JPH11204021A (en) | 1999-07-30 |
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