CN1162831A - Method for manufacturing impregnated cathode for cathode ray tube - Google Patents
Method for manufacturing impregnated cathode for cathode ray tube Download PDFInfo
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- CN1162831A CN1162831A CN 97104570 CN97104570A CN1162831A CN 1162831 A CN1162831 A CN 1162831A CN 97104570 CN97104570 CN 97104570 CN 97104570 A CN97104570 A CN 97104570A CN 1162831 A CN1162831 A CN 1162831A
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- pole plate
- negative electrode
- strutting piece
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Abstract
A procedure for manufacturing an impregnated cathode whose upper part includes an emitting plate of refractory material arranged in a support dish, wherein the soldering of the dish to its support is carried out by melting a metal material arranged between the plate and its support. The material has a melting point between the operating temperature of the cathode and the melting point of the components constituting the emitting plate.
Description
The present invention relates to about making the method for injection negative electrode, especially in order to equip the electron gun of cathode ray tube.
One pouring-in negative electrode comprises the refractory material emission pole plate (tungsten, molybdenum, rhenium etc.) of a porous, wherein injects emissive material (barium, strontium, calcium, aluminium, caesium etc.).This emission pole plate is to be arranged on the strutting piece (tantalum, molybdenum etc.) with little refractory metal dish formula: this pole plate and dish unit form the top of negative electrode.
Form a machine assembly after emission pole plate and strutting piece thereof are assembled together and to bear the different phase of making negative electrode and the hot operation of this negative electrode; In addition, between emission pole plate and its strutting piece contact should be very perfect so that the performance of assurance negative electrode.
The top that conventional art adopts distinct methods to make pouring-in negative electrode.First method is included on the backside surface of launching pole plate and plates a coating so that weld with strutting piece.Coating is generally the powder of molybdenum or rhenium.The major defect of this coating is too expensive; In addition owing to highly evaporation and deposition can cause the difficulty of storage; And be difficult to control and the deposition of repetition on this strutting piece, thereby cause the different-thickness of this interface; Unlikely in addition going up at small-sized negative electrode (less than 2mm) deposits; And the polar board surface of seal coat need be alignd so that carry out welding.
Second method as be presented on June 8th, 1993 L.R.Falce etc. at United States Patent (USP) 5,218, disclose in 263, on the emission pole plate of negative electrode on the strutting piece, mechanically block the emission pole plate by a lid or a slice of covering latter's part.Lid has a hole that pole plate can be transmitted in the pipe.This lid is with strutting piece welding, thereby forms a slice with the top of negative electrode.Its shortcoming is: this structure can increase the weight of negative electrode, and the anticathode arc time is unfavorable; The spontaneous emission plate is unfavorable for the overall performance of negative electrode to the low heat conduction efficiency of other assembly of negative electrode; There is pole plate assembling deflection or danger than high-freedom degree is arranged; Between the electron gun of negative electrode front and emission polar board surface a sheet metal is arranged, this sheet metal can change the formation of added electric field; Material is deposited on the output that can reduce on the negative electrode output place polar board surface from negative electrode subsequently.
The third method is as issuing the United States Patent (USP) 5 to K.S.Lee on December 15th, 1992,171, the method that discloses in 180, this method comprises will launch directly that pole plate is assemblied on the strutting piece and fluxless, in the high temperature hydrogen stove each sub-assembly be handled afterwards so that launch emissive material contained in the pole plate and chemically react with strutting piece and form and engage.Major defect is: the loss of the emissive material that the pole plate that engages with strutting piece formation contains can reduce the working life of negative electrode; Need many small-sized hydrogen furnace apparatus to handle to a collection of part; Moving that cause the pole plate location during handling in stove or during chemical reaction all will cause the correct location that can not guarantee pole plate; The position stability of launching pole plate in addition can not guarantee during use; And composition may separate stratification.
The 4th method that promulgation on July 7th, 1992 discloses for 5,128, No. 584 for the United States Patent (USP) of J.Choi comprises in advance carries out coarse processing to two surfaces of desiring combination, then minus plate directly is welded on its strutting piece.Adopt electric resistance welding to weld and the good connection by two inter-modules realizes.The shortcoming tool of this method maximum need weld the power supply of refractory material, changes because it can cause temperature to increase significantly or destroys emission composition in the pole plate; In addition because during negative electrode was assembled to electron gun, solder flux was still fragile and frangible, so have the welding fragility; And need be with the surface in alignment of pole plate so that welding; But the surface of the small-sized emission pole plate (less than 2mm) that aligns is difficult.
The object of the present invention is to provide the method for the pouring-in negative electrode of a manufacturing, particularly will launch pole plate and be assemblied in method on its strutting piece, the method does not have the shortcoming of above-mentioned conventional art, the method is simple and economical, emanative influence then is neutral for the emission pole plate, thereby can guarantee that reliably and repeatedly will launch pole plate locatees on its strutting piece.
Making the method for injecting negative electrode according to the present invention comprises: at the porous emission pole plate of the interior welds refractory of refractory metal strutting piece, wherein, for ease of welding, the simple metal transition material is arranged between emission pole plate and its strutting piece.In an excellent especially execution mode, this transition material is a kind of metal sheet that is inserted between emission pole plate and the strutting piece.
In the drawings:
Fig. 1 represents the profile of the injection negative electrode of conventional art.
Fig. 2 illustrates the end view of negative electrode of the present invention, shows the top of this negative electrode in stereogram.
Fig. 3 is the top view of explanation negative electrode of the present invention.
Fig. 4 is the profile of explanation preferable Implementation Modes of the present invention.
As shown in Figure 1, one injects negative electrode contains cylinder 2 usually, and its end is the top that comprises the negative electrode of launching pole plate 1, and this pole plate comprises tungsten usually as stock and be arranged on the strutting piece 13, and the material of strutting piece mostly is tantalum or molybdenum.In cylinder 2, insert heating element 5.One cylinder 4 forms the shell of negative electrode, and as the thermal loss of heat shielding to prevent to be produced by thermal element 5, thereby can increase the total thermal effect of this device.The body of negative electrode 2 remains on the position in the shielding, and by bar 3 body 2 (as the 6th point) is welded on the shell 4.
Relate to being connected of emission pole plate 1 and its strutting piece 13 about one of difficulty of the fit on of negative electrode different elements.This is connected mechanically should be very firm, can provide good heat to transmit, and be neutrality to the influence of pole plate emission characteristics, and the working temperature of all operations can be above 1200 ℃.
The stability parameter of stability parameter during emission, operation life-span, arcing and emission threshold value depends on the mechanical strength of the other parts of emission pole plate and cathode construction basically.
Because emission pole plate and strutting piece thereof are the refractory material, therefore the two is directly welded very difficulty; Conventional art once had different solutions, but did not provide a kind of simple, reliable and cheap solution with repeat property for the key component of producing cathode ray tube.
In order to make contact fully between refractory metal strutting piece 13 and the emission pole plate 1 (this contact well can make at heating element 5 and launch between the pole plate 1 good heat conduction), must under the porousness of not destroying pole plate does not also change the situation of pole plate emission characteristics, material not welded together.But welding can not carried out under the high-temperature very much.
As shown in Figure 2, the present invention inserts a metal transfer material 8 13 of pole plate 1 and strutting pieces, and this material 8 chemically is being neutral and this two assembly is welded together under quite low temperature, thereby the emission characteristics of emission pole plate is reduced.Therefore, its fusing point of selected material should be between the working temperature of the metal that the working temperature and the formation of negative electrode are launched pole plate.
Place that the transition material as interface can be a metal dust between emission pole plate and the strutting piece, flat silk ribbon or metal wire.
Based on the thermal output reason, need farthest reduce the transition material amount reducing the weight and/or the size of negative electrode owing to particularly, thus in a kind of excellent embodiment pattern transition material be with vacuum direct evaporation mode material is deposited on support 13 on.In this way, the thickness of material 8 coatings can be controlled between 1 to 25 micron, and this thickness can make element 1 and 13 good welding and can not influence the thermal output characteristic of negative electrode.
In another preferred embodiment pattern, transition material is the foil formula, and its thickness is chosen between 1 to 25 micron.The size that thin slice is cut into makes its contact-making surface that can all not occupy 1 on strutting piece 13 and pole plate, so that reduce the weight of transition material.Yet, for welding reliably between pole plate and strutting piece, consider the welding of small size components, so the surface that transition material covered is essential sufficient.Experience shows that the surface of thin slice is about 04 and 0.7 times of emission polar board surface, is generally circular, thereby might guarantees to carry out the welding of inter-module under good reliable conditions.
As shown in Figure 3, be the interior view of strutting piece 13, it is the rectangle of fillet that thin slice 10 for example is cut into four jiaos, and the advantage of this kind shape is a centre automatically in being inserted into the strutting piece 13 that is generally a dish time.This mode can guarantee to launch pole plate 1 by the center that pad 9 is placed plate and be welded on the strutting piece 13.With the diameter is the cylindrical emission pole plate of 1.27mm, and sheet metal is chosen as preferably that 1.1mm is long, 0.6mm is wide, and thickness is elected the 1-25 micron as.
The metal material of interface 8 should be elected as at high temperature chemical reaction can not take place, and guaranteeing simultaneously to launch between pole plate and the strutting piece has favorable mechanical to be connected.And its fusing point should quite hang down not reduce the emission characteristics of emission pole plate.
Can use different metals, pure or alloy form is to realize the present invention: metals such as nickel, chromium, vanadium and rhenium for example, the good effect of Yan Junyou no matter consider from machinery still the neutrality of the emission characteristics of launching pole plate.
In the embodiment of excellence pattern, we select pure nickel to make thin slice 10.The fusing point of this metal is 1,453 ℃, between 3,410 ℃ of the fusing points of 1,200 ℃ of working temperature of negative electrode and tungsten plate; Its heat conductivity is good, and good weldability is arranged between tungsten and tantalum.In addition, nickel also has the magnetic properties of materials; Therefore, consider that the size of components that constitutes negative electrode is very little, can it is deposited on the dish automatically by the thin slice electro permanent magnetic, and this deposition to control artificially be suitable difficulty.
Claims (6)
1, a kind of method of injecting negative electrode of making comprises: the emission pole plate (1) in the interior welds porous of refractory metal strutting piece (13) is characterized in that: for the ease of welding, place a simple metal transition material (8) in the middle of pole plate and strutting piece.
According to the method for claim 1, it is characterized in that 2, the fusing point of described transition material (8) is between the fusing point of the metal that the working temperature and the formation of negative electrode are launched pole plate.
According to the method for claim 1 or 2, it is characterized in that 3, described transition material (8) is to be deposited in a vacuum on the strutting piece of emission pole plate.
According to the method for claim 1 or 2, it is characterized in that 4, described transition material is a metal sheet form.
According to the method for claim 4, it is characterized in that 5, described metallic plate is a rectangle basically.
According to the method for claim 1 or 2, it is characterized in that 6, described transition material (8) is the metal powder form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97104570 CN1162831A (en) | 1996-03-28 | 1997-03-28 | Method for manufacturing impregnated cathode for cathode ray tube |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96400659.7 | 1996-03-28 | ||
| CN 97104570 CN1162831A (en) | 1996-03-28 | 1997-03-28 | Method for manufacturing impregnated cathode for cathode ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1162831A true CN1162831A (en) | 1997-10-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97104570 Pending CN1162831A (en) | 1996-03-28 | 1997-03-28 | Method for manufacturing impregnated cathode for cathode ray tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1162831A (en) |
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1997
- 1997-03-28 CN CN 97104570 patent/CN1162831A/en active Pending
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