TW469462B - Cathode subassembly and color CRT equipped therewith - Google Patents

Abstract

A cathode subassembly for color CRTs is provided, which exhibits scarcely the degradation of electron emission capability for at least ordinary lifetime of color CRTs even at a high current density greater than 1 A/cm2 while it has an equivalent activation time and an equivalent operating temperature to those of former oxide cathodes. The cathode subassembly comprises (1) a porous cathode sheet (11) formed by a sintered body containing Ni, scandium oxide (Sc2O3), and an electron-emissive material; the body being made by sintering a mixture of a Ni powder, a scandium oxide (Sc2O3) powder, and an electron-emissive material powder using an HIP process; the cathode sheet has an electron emission surface; and (2) a sheet support for supporting the sheet support having a part in contact with the sheet; the part being made of an alloy containing Ni as its main ingredient and at least one metal selected from the group consisting of chromium (Cr), tantalum (Ta), molybdenum (Mo), zirconium (Zr), tungsten (W), and cobalt (Co); at least one metal selected from the group consisting of Cr, Ta, Mo, Zr, W, and Co serves as a reducing agent for the electron-emissive material. Preferably, the electron-emissive material is a carbonate generated by co-precipitation of Ba, Sr, and Ca.

Description

469 ^ 62 V. Description of the invention (1) Field of the invention: The present invention relates to a cathode subassembly and a color cathode ray tube (CRT) ', and particularly to a cathode subassembly, which still has a high operating current. It has a long service life, and it is installed in a color cathode ray tube. Description of related technology: At present, almost all color cathode ray tubes are composed of so-called "oxide cathodes". It is understood that the oxidized cathode includes a cathode base made of a special metal material and a porous, oxide film covering the surface of the base. The metallic material in the substrate contains the main component nickel (H) plus a trace amount of reducing agent (for example: silicon (si) and magnesium (; porous oxide film is made of alkaline earth metal oxide containing barium (Ba)). The thickness is about 50 micrometers to 100 micrometers. "" The oxidation cathode is slightly lower than the temperature δ00 t: it can be easily activated during operation, and the production cost is low β. Therefore, it has been widely used in practice. The following description is about design Known technology of oxidized cathodes in color cathode ray tube extreme times. # Figure 1 shows the oxidized cathodes with cathode subassembly shown in Figure 1. The conventional technology of oxidized cathode 70 includes: ^ (That is, nickel-based material) plus a trace amount of reducing agent (for example, a cathode substrate 71 made by attacking a nickel metal material, and the substrate 71 is externally created by magnesium). The substrate 71 is used for an electron-emitting surface The surface is covered with a porous oxide film 72 formed by two-two-hat alkaline-earth metal oxides, one-two micrometers containing barium to 100 micrometers, and a thickness of about 50.

Page 5 46946 2 V. Description of the invention (2) ----- The cathode sleeve 73 is placed in the substrate π on the back side of the tritium film 72, and the sleeve 73 and the substrate 71 are fixed by welding. The cathode 70 itself is heated by a heater 74 attached to the sleeve 73. The base 71, the membrane 72, and the sleeve 73 constitute a cathode subassembly ... 79 丄 Therefore, it can be said that the cathode 70 is composed of the subassembly 79 and the heater 74. The number 75 indicates an interface between the substrate 71 and the film 72. The disadvantage of the conventional technique of the cathode subassembly 79 is that when the high operating current density is about 1 A / cm2 or more, the service life is reduced from tens of thousands of hours to thousands of hours or less. In other words, the electron emission capability (ie, emissivity) of the sub-module 79 is greatly reduced when operating at a high operating current density of about u / cm2 for thousands of hours, which is almost the only known technology for oxidizing the sub-module 79. Shortcomings. The next reason is believed to be the cause of the reduced emissivity of the sub-module 79. When the cathode substrate 71 is heated up to about 800 ° C by the heater 74, the silicon and magnesium (for reducing agent) contained in the substrate 71 undergo thermal diffusion in the substrate 71, and then oxidize with the porous film 72. Barium (Ba0) reacts at the interface 75. Therefore, the following chemical reactions (1) and (2) occur.

BaO + (l / 2) Si —i> Ba r (l / 2) Si〇 (1) j BaO + Mg — ^ Ba + MgO (2) The result of reaction (1) and (2) makes the lock atom low Work function, so electrons are emitted from the barium atom. However, in this case, the products produced by reactions (1) and (2): silicon oxide and magnesium oxide, deposited a layer at the interface 75. Therefore, an intermediate layer made of silicon oxide and magnesium oxide is formed at the interface 75 (not shown in the figure). The middle layer is a large resistance ’which prevents electrons from flowing through the sub-components 7 9 and

469462

In addition, the contact between silicon, magnesium, and thallium in the substrate 71 is hindered, and the progress of the reactions (2) and (2) is suppressed. For these two reasons, the electron emission rate of the conventional technique of the sub-assembly 79 decreases when the operation time is relatively long. The above-mentioned emissivity reduction mechanism is compatible with the operating current density. However, if the operating current density is higher than 1A / Cm2, the emissivity will decrease. d In addition, when the operating current density of the cathode sub-assembly 79 is large, the intermediate layer is formed quickly after the private door operation. Therefore, Joule heat is generated in the intermediate layer regardless of the obstructions when operating at a high current density. Due to the generation of Joule heat, the temperature of the interface 75 during operation is tens of degrees higher than the operating temperature. As a result, deer (1) and (2) progressed excessively, and the middle layer grew excessively and became thick. Due to the positive feedback action, a series of phenomena are accelerated. This is the mechanism by which the above-mentioned cathode subassembly is lowered. The early color cathode ray tubes were small in size and low in operating current density, and the service life of the cathode did not cause any problems. In contrast, today's luxury color cathode ray tubes have become larger in size and use operating currents at a density higher than i A / cm2. Therefore, the shortcoming of the short service life described above becomes more apparent. ^ To address this shortcoming, many improvements have been made to allow the oxidation cathode to have a longer service life at high operating current densities. For example, published in Japanese Unexamined Patent Publication No. 64-5417 in January 1989, an improved oxidation cathode is disclosed. The pore film in the oxidation cathode is made of rare earth metal oxides (for example: Oxide sharp (SC9〇3 )), Mixed with barium-containing alkaline earth metal oxides. The modified cathode is above

4 6 9 4 6 2 V. Description of the invention ⑷ The service life at two operating current densities is longer than the previous oxidation cathode. However, 'is not enough to meet the practical application. Another improved oxidized cathode was publicly published in Japanese Unexamined Patent Publication No. 9-1 06750 in April, 1997. The improved oxidized cathode includes: a cathode substrate, a porous film made of a rare earth metal oxide (such as hafnium oxide) mixed with a barium-containing earth test metal oxide, and a layer of metal (such as tungsten (W)) on the substrate and Between the membranes. The improved cathode has a longer service life than the previous oxidized cathode at the above-mentioned high operating current density. However, it is no longer sufficient for practical applications. The improved oxidation cathodes disclosed in the publications Nos. 64-54 1 7 and 9-1 06750 have a disadvantage. The above-mentioned high operating current of the oxidation cathode is similar to that of the previous oxidation cathode. On the other hand, it is very troublesome to incorporate impregnated cathodes into color cathode ray tubes. It is understood that impregnated cathodes are usually used in microwave tubes and are determined to operate at the above-mentioned high operating current density for a long time. . When the cathode is immersed, even at a high current density, the electron emission rate is hardly reduced, and there is a problem about the use of the emissary. However, the impregnated cathode:-Yan: The disadvantages are the activation time & the high operating temperature and the manufacturing cost: Second, there will be no such problems. Long activation time requires lengthening the aging line of the cathode; high operating temperatures require improvement: changing the material of the cathode subassembly and increasing the thermal resistance of the electrons. These requirements or problems are actually very difficult to resolve Explain in detail that the gasification cathode has been modified in order to meet the needs at high operating current density; on the other hand, the cathode will be immersed

469462 V. Description of the invention (5) Application to color cathode ray tubes. However, the service life of the above-mentioned improved oxidation cathode at high operating current density is still problematic and cannot satisfy practical applications. Impregnated cathodes have problems with long activation times, high operating temperatures, and high manufacturing costs. Therefore, neither the improved oxidation cathode nor the impregnated cathode can replace the conventional technique of the oxidation cathode 70 shown in FIG. 1. Summary of the invention: The object of the present invention is to propose a cathode subassembly, which has the same activation time and operating temperature as a conventional oxidized cathode, and is generally similar to a color-injection cathode-ray tube, and has a small lifetime. There is almost no decrease in the high operating current density of 1A / cm2, and this cathode subassembly is installed in a color cathode ray tube. Another object of the present invention is to provide a cathode sub-assembly, and the emissivity can be implemented in a simplified manufacturing process and installed in a color cathode. The above purpose and other unspecified purposes will be familiar to those skilled in the art through the following description More clear. According to the first aspect of the present invention, the proposed cathode sub-assembly includes:) A multi-porous cathode sheet, which is formed of a sintered object containing nickel and sharp oxide (s = material; this system uses a thermal homogenizer). Made of powder and electron emitting material powder / tritium; this cathode has an electron emitting surface. M pieces of sheet support to support the cathode sheet; this sheet support-i (Cr) ^ dipole sheet; this part is composed of the main component nickel and at least one slave, button (Ta), molybdenum (M〇) , Zirconium (Zr), tungsten) and

469462 V. Description of the invention (6) H) Made of metal alloys selected by the group; at least one metal selected from the group of chromium, reduced tungsten and cobalt is used in electron emission materials for diligent research The mechanism of the oxidation of the cathode at high operating current densities has been around for a long time. The result has been successfully @GANM & A has an improved structure of the oxidation cathode sub-module with a new structure. During the life span of the color ^ ~ at least general, its electron emission rate is almost even 1A / cm south operating current density. No reduction. In particular, as outlined above, the cathode sub-assembly of the present invention includes a porous cathode sheet formed of a sintered body of δ nickel, oxide oxide, and an electron-emitting material, and a sheet support for supporting the cathode sheet. This object system uses heat Equal pressure sintered nickel powder, hafnium oxide powder and electron emitting material powder mixture. A part of the sheet support is in contact with the cathode sheet, and this part is made of nickel as a main component and at least one metal alloy selected from the group consisting of chromium, button, molybdenum, zirconium, tungsten, and cobalt; at least one kind of chromium Metals selected from the group consisting of iron, giant, molybdenum, hammer, tungsten and cobalt are used as reducing agents for electron emission materials. A porous cathode sheet used as a cathode substrate is formed of a sintered object containing nickel, oxide oxide, and an electron-emitting material. Therefore, it has a grid-shaped structure or organization similar to a record, in other words, has many open pores. The holes of the cathode sheet are filled with an electron emitting material and thorium oxide. Therefore, the total area of the interface between the cathode sheet (that is, the cathode substrate) and the electron-emitting material is greatly increased, and at the same time, the thickness of the intermediate layer formed per unit interface area is greatly reduced. Due to the reduction in the thickness of the intermediate layer ’, even at large & 1A / cm2

Page 10 469462 V. Description of the invention (7) ί: f Ϊ 下 ’intermediate layer will not accelerate to form. Similarly, the oxygen = hunger filled in Kongsi has the function of preventing the formation of the intermediate layer, so the rate of use from the color cathode ray tube to the serviceable life is almost not reduced even in the above-mentioned current density greater than u. η Interpolated Electricity = Outer 'maintains the advantages of short activation time and low operating temperature because the electron emission mechanism is the same as that of a general oxidation cathode. To; a reducing agent for chromium, tantalum, molybdenum, rhenium, tungsten, and cobalt used as an electron-emitting material. Therefore, the reduction reaction of the electron-emitting material is accelerated, and an excellent manufacturing process is provided. Bamboo "Wang Xingjian 1 In addition, at least one t of metals selected from the group consisting of chromium m, tungsten and cobalt will not generate high resistance through the reduction reaction of the electron emitting material. Therefore, the electron emission rate can be further suppressed. Reduction. ~ As mentioned above, the cathode sub-group according to the first aspect of the present invention achieves the above-mentioned objective. According to the second form of the sun and the moon, the color shade includes the cathode sub-assembly described in the first form. Needless to say, nI < is achieved in a cathode ray tube. ㈣ 'The above object is also a simple illustration of the schema: In order to make the present invention ^ above and other objects, features, and advantages more obvious and understandable, the attached The diagram is explained as follows: Figure! The figure shows a schematic cross-sectional view of the conventional structure of a gasification cathode including a cathode subassembly. 469462 V. Description of the invention (8) Figure 2 shows the oxidation before the decomposition & decomposition process of the present invention is included. Sectional view of the structure of the cathode. The pole-human component on the cathode. Figure 3 shows the oxidized cathode V of the electron-emitting surface of the electron-emitting material film into a pole piece. The structure V is slightly decomposed. Figure 4 shows the implementation of the present invention. Figure 5 shows the relationship between the cathode secondary structure and the decomposition temperature. Figure 5 shows the relationship between the driving voltage and the emission current of the device in the embodiment of the present invention and the conventional technology. &Amp; FIG. 6 is a graph showing the relationship between the characteristics of the cathode subassembly and the maximum cathode current in the embodiment of the present invention. FIG. 7 shows the cathode subassembly in the embodiment of the present invention. A graph of the relationship between the amount of electrode current change and operating time. [Symbols] 70, Ϊ0 ~ oxidized cathode; 7 1 ~ cathode substrate; 72 ~ porous oxide film; 73, 14 ~ cathode sleeve; 74, 15 ~ heated 75 ~ interface between substrate and membrane; 7, 9, 19 ~ cathode subassembly; 1 polyporous cathode sheet; 12 ~ sheet support; 13 ~ emitting surface; 17 ~ hole; 23 ~ emitting material film. Description of the invention: The embodiments of the present invention will be described in detail with reference to the attached drawings. The oxidation cathodes disclosed in Japanese Unexamined Patent Publication Nos. 64-541 7 and 9-1 06 750 were mentioned in the background of the invention. Technology, you can add a reaction to the reaction ( 1) and (2) slow down a series by decomposing the middle layer

469462 V. Description of the invention (9) Progress of phenomenon ', thereby suppressing the decrease of the electron emission rate. Unlike this, the present inventors found that if the thickness of the intermediate layer is thinner than the conventional technique of oxidizing the cathode, even if the current density is higher than 1A / cm2 at high operation and no reaction is added to reactions (1) and (2), —The phenomenon of series will not be accelerated due to the positive feedback. The fact that 'is considered to be a small thickness of the intermediate layer' produces less total Joule heat from the intermediate layer and the intermediate layer will not be overheated, thus preventing the forward direction. Feedback. Comparing the conventional technique of the oxidized cathode sub-assembly 79 shown in FIG. 1, the total quotient (ie, total volume) of silicon oxide and oxidized town generated by reactions (1) and (2) in the area of the interface 75, The thickness of the intermediate layer is clearly shown. Therefore, if the area grows over a wider interface 75, the thickness of the intermediate layer will be smaller. However, from the perspective of Fig. 1, the area of the interface 75 is approximately equal to the electron-emitting surface area of the cathode substrate 71. According to the inference, the area of the interface 75 cannot be completely increased without changing the π structure of the subassembly. In view of this, the present invention provides a cathode subassembly, which replaces the cathode substrate with a "porous cathode sheet" made of two porous sintered objects. The micro-holes in the film (that is, the 'object') are filled with the electron emission material. Therefore, the inner walls of all the holes in the film can be used as the interface of the electron-emitting material. It is understood that the surface area of the sintered body of the porous team is usually 1,000 times or tens of thousands of times as large as the size of the same ship. It means the interface of electron emission materials, thousands of times or tens of thousands of times of the known technology. In other words, the thickness of the intermediate layer of the secondary component of the present invention is one thousandth of the conventional technology of the secondary component 79—or tens of thousands of ^^, which completely reduces the Joule heat generated by the unit area of the intermediate layer. The interface will not be overheated and the above anti-reverse action is 469462

Use also stops, thus preventing a series of phenomena from accelerating. " On the other hand, the electron emission mechanism or sub-assembly principle in the present invention is the same as the conventional technique of the human assembly 79. In particular, the barium atom generates an emitted electron via the reaction (,: (2)) to generate a low work function. This results in the activation time being the same as the operating temperature and the conventional technique of the sub-assembly 79.: Down 'In the present invention, the electron emitting material is filled The method of entering the cathode sheet is described below. It is not easy to fill the holes in the porous sheet with the electron-emitting material. The first method is to use the so-called "f used impregnation method", which was used to produce The well-known impregnated cathode β method is to keep the porous sheet in contact with the electron emitting material, and then heat it up to a special temperature to melt the emitting material. In this case, the molten emitting material is automatically impregnated into the film by capillary action. The reason why the graft immersion immersion method can be used to produce impregnated cathodes is that the melting point of the cathode substrate is higher than the melting point of the electron emitting material. For example, if the cathode substrate is made of a sintered object of a crane and the electron emitting material is It is barium-calcium aluminate (alumminate), the melting point of the substrate is about 3300 ° C and the melting point of the emitting material is about 2 500 t. This means that the melting point of the substrate is 800 degrees higher than the melting point of the emissive material. However, before the reference, the impregnated cathode in this example has the disadvantages of long activation time and high operation temperature (for example, about 100 ° C). This disadvantage is caused by the materials used (i.e., 'tungsten and barium-calcium aluminate) and is therefore very difficult to resolve. In order not to lose the characteristics of short activation time and low operating temperature in the conventional technology of oxidized cathode, the substrate needs to be made of an alloy containing nickel as the main component (that is, a 'nickel-based

469462 V. Description of the invention (ΐϊ ^ ---- 一 gold) and the emitting material is a barium-containing alkaline earth metal oxide (that is, a lock oxide earth test metal). However, because the pain points of nickel-based alloys and barium-containing alkaline-earth gold oxides are almost equal to about 1 400 ° c, it is not possible to apply melt impregnation. The second method of filling electron-emitting materials into holes in a porous sheet is uniform. The nickel-based alloy powder and the barium oxide-containing alkaline earth metal powder are mixed for high-temperature sintering in a vacuum or nitrogen atmosphere. One problem with this method, however, is that no electrons are emitted from the cathode. This is due to the production process of the cathode sheet or the color cathode ray tube according to the following chemical equation (3).

BaO + H20— > Ba (〇H) 2 (3) Barium oxide (Ba0) in the cathode sheet reacts with moisture in the atmosphere to become barium hydroxide (Ba (〇H) 2). It is understood that the 'hydroxide pin' does not generate barium atoms similar to reactions (1) and (2) through any reduction reaction. Therefore, the porous cathode sheet produced by the sintered body at 800 ° C was electrically neutral without electron emission. However, if all the steps from the production of the film to the installation of the color cathode ray tube are completed in an anhydrous atmosphere (such as a 'nitrogen atmosphere'), electrons may be emitted from the moon at 800 hours. This idea is not feasible, because the need for very large equipment ’makes the second method equally unapplicable. Returning to the conventional technique of oxidizing the cathode 79 in FIG. 1, it can be seen that the following method can cleverly prevent the chemical reaction (3) from occurring at the cathode 79. The copper-containing alkaline earth metal carbonate (ie, the barium-containing alkaline earth metal) is used in place of the lock-oxidized alkaline earth metal. Since the alkaline earth metal containing barium carbonate is very stable in the atmosphere ’, there will not be any similar reaction (3).

469 ^^ 2 V. Description of the invention (12) The barium carbonate alkaline earth metal is coated on the surface of the substrate 71, and it is vacuum heated to 800 ° C to 100tre during the cathodic decomposition process. The following reaction (4) occurs due to heating, which causes barium carbonate (BaC03) to decompose into barium oxide.

BaC03— > BaO + C02 (4) Because barium oxide is generated in a vacuum, it does not react with moisture in the atmosphere, so it does not change to barium hydroxide by reaction (3). As a result, a porous film 72 containing barium oxide alkaline earth metal can be formed on the substrate 71. Any soil test metal other than the lock will have a similar reaction (4) in the substrate 71. However, this is not important to the present invention and is ignored. The inventor intends to combine the method of changing the barium-containing oxidized soil test metal into the barium-containing carbonate test metal in the conventional technology of the oxidation cathode 79 and the method of filling the holes in the porous sheet with the electron-emitting material. Method 0: Mix the base alloy powder with the barium carbonate-containing alkaline earth metal powder uniformly, and then perform high temperature sintering in a vacuum or nitrogen atmosphere. In this method, the sintering temperature is set to 1000 because the melting point of the metal is about 1400 ° C.匚 However, it is understood that if the copper-containing carbonic acid soil test metal is heated to 1000s C 3) into the ^ 1 formula (4) and completely decomposed into barium oxide, then according to the two formulas of the equation & step to barium hydroxide. Therefore, the cathode sheet has the same problems as those produced using the above-mentioned No. 1 emission (ie, no electron porosity is generated, that is, the cathode 7 9 is filled with the electron-emitting material in the conventional technique, and the holes in the sheet are filled. The method cannot be adopted. Next, the present inventor noticed that it was caused by barium carbonate in reaction (4).

4 6 9 4 6 2 V. Description of the invention (13) Generate carbon dioxide gas. In other words, according to Le Chatelier's law, in fact, if the sintering process of the barium carbonate-containing powder mixture is performed under high pressure, no reaction will occur (4). This means that the barium carbonate-containing powder mixture is constrained by sintering at a certain high pressure, and the nickel-based alloy sintered is a barium-containing alkaline earth metal containing barium carbonate that does not decompose. In order to perform sintering under high pressure, the present inventors noticed the so-called hot equalizing (HIP) method, which is an example published in February 1996 in Japanese Unexamined Patent Publication No. 8-5 0849. The sintered object disclosed in the bulletin No. 8-50849 'electron-emitting material maintains the form of carbonate, so the electron emission characteristics are also processed through wet cutting, wet grinding, cleaning and drying (below 300 ° C). No degradation. Therefore, there is an advantage that the sintered object is processed into a wafer without strict restrictions and the manufacturing lines of the wafer can be easily constructed. As disclosed in Gazette No. 8-50849, the electron-emitting material filled in the pores of the sintered object is not limited to contain a lock; 5 carbonic acid alkaline earth metal. And the 'barium-containing carbonate alkaline earth metal does not need to be decomposed into a barium-containing oxide alkaline earth metal. As a result of subsequent research, the inventors found the following facts: (1) The electron-emitting material must be a barium carbonate-containing alkaline earth metal. (2) Barium carbonate soil test metal must be decomposed into barium oxide soil test metal. (3) Carbonate (ie, barium / crane / calcium carbonate co-precipitate) produced by co-precipitation of barium (Ba), Sr, and Ca Alkaline earth metals are preferred. The preferred molar ratios for barium, scandium, and calcium are barium: gill: calcium = (45 to 65): (30 to 50): (2

Page 17 4 6 9 46 2 V. Description of the invention (14) to 15 (4+) Barium oxide-containing alkaline earth metals must be formed during cathodic decomposition. Ϊ t Ϊ covers the emission surface of the cathode. In this regard, a barium / recording / calcium oxide coprecipitate is preferred. As explained earlier with reference to equations (1) and (2), the reducing agent must reduce barium oxide. In the technique disclosed in the above-mentioned publication No. 8_5 0849, the 'reducing agent is constrained by the heat equalizing pressure and is together with the nickel-based alloy powder and the subemissive material. However, it was found that some of the reducing agents did not show any required reduction. This is because part of the reducing agent has reacted with the nickel powder during the hot equalization, causing the cathode sheet on the color cathode ray tube to have lost its effect during operation. In order to compensate for the weakening of the reduction effect, the present inventors developed a new structure containing a reducing agent supply layer between the cathode sheet and the sheet support (such as a 'cathode cap') and disclosed in Japanese Unexamined Patent Publication No. 9-63459. Although the cathode structure disclosed in Japanese Unexamined Patent Publication No. 9-63459 shows a required reduction reaction, it has a drawback that the manufacturing process is complicated. In order to eliminate this point, the present inventors continued to study and found that if the nickel-based alloy containing the reducing agent is located at the portion where the sheet support is in contact with the cathode sheet, the required reaction occurs due to the relationship between the nickel-based alloy containing the reducing agent (1) With (2). For example, the moon support may itself be made of a nickel-based alloy containing a reducing agent. If so ', the required reduction reaction can be displayed and the manufacturing process can be simplified. Dart-based alloys containing reducing agents, preferably at least one metal is from chromium (Cr), button (Ta), molybdenum (Mo), hammer (zr), tungsten) and 469 ^ 62 5. Description of the invention (15) ------- = 3) Choose a group of eight out of 100. The setting range of the reducing agent for recording and synthesis is better. 1] Weight-to-blade ratio (wt%), because it can enhance the radiation, mechanical and thermal characteristics of the lightning. From the point of view of (. = Maoben), chromium is the best and the reducing agent ratio is set at a weight percentage of 19 to 30. We σ are worse than chromium, and the proportion ranges from 19 to 30 weight When mixed into nickel-based alloys as a percentage, the reduction reaction of barium oxide will be as shown in the following equation (5): aBaO + ^ Cr Ba3 (Cr04) 2 + rBa (5) Fortunately, Bas (Cr generated by reaction (5) 〇4) 2 The by-product hardly forms any high-resistance intermediate layer, which is different from the oxide stone and oxide town by-products generated by reactions (1) and (2). Therefore, almost no intermediate layer with resistance is formed. And the thickness of the intermediate layer is reduced by thousands of times or tens of thousands of times due to the increase in the total area of the interface between the electron-emitting material and the sheet, resulting in further reduction in the reduction of the electron emission efficiency. It is best to be 30 ° C to 800 In the temperature range of ° C, the thermal expansion coefficient (that is, the linear expansion coefficient) of the cathode sheet (that is, the sintered object) is set to 12χ 10-νκ to 2χ 10-δ / κ. In this case, we will Chromium-to-nickel composite ratio set at 19 to 30 weight percent It has a significant advantage. This is because this type of support has a thermal expansion coefficient of 13. 3 X 10-6 / K to 15 X 10-6 / κ in the temperature range ( That is, the coefficient of linear expansion), and it is almost equal to the coefficient of linear expansion of the cathode sheet. Therefore, 'there is no thermal stress between the cathode sheet and the sheet support, thereby ensuring the stability and reliability of the cathode sub-assembly. By a rare earth oxide-containing metal (for example, oxidized

Page 19 ^ S 9 46 2 V. Description of the invention (16) The cathode sheet of the aircraft (SqO3) was published in the above-mentioned bulletin No. 8_5〇849. Β further disclosed in February 1999 a method for producing sintered objects and Published in Japanese Unexamined Patent Publication No. 1 1-400 46, that is, nickel powder and rare earth oxide powder are uniformly mixed together, the mixture is added in a hydrogen (η2) atmosphere, and the electron emitting material is mixed into the mixture. Therefore, the mixture containing the electron-emitting material is constrained by the heat equalizing pressure, thereby forming a sintered body. Here, the present inventors have disclosed the following two unpublished new results. In particular, when scandium oxide (Sc20 3) When selected from many rare earth oxide metals, 'The best mixing ratio range for oxide mirrors for all electron-emitting material powders and nickel powders is from 1 to 7 weight percent (wt% ^ This limitation is in the process of cathode decomposition') The emission surface on the cathode sheet forms an electron-emitting material with a thickness of 20 micrometers to 150 micrometers. The following is a detailed explanation. Before the cathode decomposition process, the emission of the cathode sheet is closely related. The surface is as flat as a mirror surface with no film on it. During the decomposition process, electron-emitting materials in the porous sheet (eg, barium / strontium / calcium oxide co-precipitates) seep from the emitting surface through the holes. When the decomposition process is complete At the time, the emitting surface layer is an electron-emitting dry film. The inventors found that the film of the electron-emitting material formed on the emitting surface is almost inversely proportional to the total amount of thorium oxide added to the cathode sheet. 8_5〇849 and H-40 046 and other published or ^ documents. If the total amount of hafnium oxide is less than%, the thickness of the emissive material film will be 1 to 150 microns; if the total amount of vanadium oxide is more than 7wt%, the emissive material film thickness of

Page 20 4 6 9 4t > ^

5. Description of the invention (17) is at 20 microns. When the thickness of the emissive material film is greater than 15 micrometers, it is difficult for the electrons in the sheet to emit toward the outside of the film and reduce the electron emission. When the emitter =: thickness is less than 20 micrometers, the number of electrons generated from the emitting surface is small or the electron emission is likewise reduced. Therefore, it is best to set the total thickness of the erbium oxide in the range of 1 ^^ i to 7% resistance to a film thickness of 20 micrometers to Ϊ50 micrometers. The surface roughness (In) of the emission surface of the cathode sheet is preferably set to 3 or less. This means that the emitting surface is reflective, in other words, approximately a polished mirror surface. This has the following advantages. The sintered object has a minute grid_like structure of nickel, which is filled with an emissive material and an oxide sharp. This sintered object is sliced or shaped to form a cathode sheet. Because the chain is hard gold2, the cross-sectional view of the object tends to form a so-called depression, covering a part: area two. Therefore, the hole filled with the emitting material and thorium oxide covers the depression. The oxidation of barium / strontium / calcium has a total amount of 矣 2. It is decomposed during the solution process, and the decomposed emissive material cannot emit electrons. That is, the emissive material can not be formed on the entire surface. Table: The depression is completely removed. The emission surface of the film can be applied to the surface of the surface ~ 3 ^ 水 ϊ Ρ Ρ Ρ I, I, Αλ 1 J clothing ancestral roughness to solve this problem. The appropriate weight ratio of the nickel powder is determined by the yin Ϊ = and the mechanical strength of the sintered object. In particular, 、, 道, &; ϋ i are too small, and it is easy to understand that the number of emitted electrons will cause the electron emission energizing handle. I Too much, the group & I & g M On the other hand, if the total amount of powder of the emitting material is large, the total amount of nickel particles in the lattice structure is insufficient, resulting in sintered objects

Page 21 469 ^ 6 2-

5. Description of the invention (18) _ The mechanical strength is not sufficient to form a cathode sheet. The weight ratio of the ground powder to the nickel powder is preferably in the range of 40 t ^: ′ emitting material powder and electron emitting material; = to 9 /: t%. The appropriate average particle size of the powder is determined by the co-precipitation of calcium carbonate and the pore size of the lattice structure 4Ϊ: Larger than the degree sintering: The lattice structure of the body is rough and the mechanical strength is low. Therefore, it is difficult to obtain the desired shape and size in the mechanical manufacturing process. If the average particle diameter of the nickel powder is too small, the lattice structure of the sintered object is tight; therefore, electron emission is provided. Considering the fact that the radioactive material is not in the range of 9 micrometers, the fact that the average particle diameter of the nickel powder is preferably in order to improve the electron emission characteristics, and the average particle diameter of the barium / lithium / calcium carbonate co-precipitate is preferably similar to the nickel particles. The reason

I

The pore size is approximate to the average particle diameter of nickel powder. Therefore, if the average particle size of the barium / calcium co-precipitate powder is similar to the average particle size of nickel particles, the barium / 钡 / calcium co-precipitate particles into the pores will not be too much or too large. It is beneficial to exclude the abnormal crystal stress generated in the barium / gill / calcium carbonate precipitates. The average particle size of the barium / gill / calcium carbonate coprecipitate powder is preferably in the range of 0.9 micrometers to 7 micrometers. D For the present invention, from the nickel carbonyl, the so-called "carb method 〇nyi ffletho (i) ”(also called thermal decomposition method) is the best nickel powder. Another name for the word“ nickel tetracarbonyl ”is Ni (CO) 4 'which is reacted by nickel with carbon monoxide (c). When the temperature is below 42 ° K, the tetracarbonyl nickel will be decomposed into nickel and-gasification due to the temperature above 453K.

Page 22 469 Αδ 2 V. Description of the invention (19) Carbon, so natural nickel uses this reaction to produce high-purity nickel. The carbonyl method has been widely used for this purpose. The resulting high-purity nickel is called "nickel carbonyl". According to the research by the present inventors, it is preferable that the nickel carbonyl powder is not completely understood from the viewpoint of electron emission ability and characteristics. However, the carbon (C) remaining from carbon monoxide is considered an impurity in nickel and affects the electron emission ability. For the following reasons, the density of the sintered object is preferably more than 82% of the theoretical density (assuming that the sintered object does not contain & calculated with holes). If the density of the sintered object is lower than 82% of the theoretical density, the lattice structure of nickel does not have sufficient mechanical strength, so the sintered object cannot have the required size. In addition, the 'density measurement is convenient to check whether the sintering process is normally performed by the hot equalizing method. In the following, a preferred embodiment is specifically described, and it is described in detail in conjunction with the attached drawings 2 to 7: FIG. 2 shows a color cathode ray tube designed according to an embodiment of the present invention, which contains a cathode subassembly cathode. As shown in FIG. 2, “cathode 10 includes a cathode casing 14 that is approximately cylindrical” and a cap-shaped sheet support 12 fixed to the top of the tube 14 by welding and a disc shape fixed to the sheet support 12 by welding. Cathode sheet ^. The cathode sheet η is completely pressed against the sheet support 12. According to the embodiment of the present invention, the cathode sheet 11, the sheet support 12 and the cathode sleeve 4 are formed into a cathode subassembly 19 ^ The cathode sheet 11 is formed of a mixture of nickel powder, hafnium oxide powder and electron emission material powder Into a sintered object. In particular, these three powders are uniformly mixed into a special powder or powder mixture. Formed powder or mix

Page 23 469 厶 6 2 V. Description of the invention (20) The object 'is sintered into a sintered body by a hot equalizing method. Thereafter, the sintered object is subjected to appropriate mechanical manufacturing processing, thereby forming a cathode sheet U. For proper reasons, the cathode sheet 11 has a porous structure similar to the lattice structure of nickel and has many minute holes therein. The holes are filled with hafnium oxide and an electron-emitting material. The cathode sheet Π has the function of the cathode substrate 71 shown in the conventional technique of the cathode 70 shown in the first figure. A sheet support 12 made of a main component and at least one metal alloy selected from the group consisting of chromium, group, turn, knot, crane and cobalt is used as a reducing agent for the electron emitting material. The heater 15 fixed in the sleeve 14 is used to heat the cathode sub-assembly 19. The structure of the heater 15 is the same as that used for a general oxidation cathode, including the cathode sub-assembly according to the above structure of the present invention. It has a multi-porous or lattice structure or organization and the holes 17 in the cathode sheet ^ are filled with emitting materials and oxides. Because of &, 丄 = of the emitting material and the cathode η is greatly increased. At the same time, the thickness of the intermediate layer formed per unit interface area is greatly reduced. = Secondary component 79 conventional technology, intermediate I (not shown in the figure) f is the interface formed between the emitting material and the cathode sheet u during the fine work. The increase in the defect 'has a large thickness of the intermediate layer per unit area: when the ground Ui is at a high operating current density of 1A / cm2, the middle does not accelerate. Similarly, dysprosium oxide was filled into Zhuo Yue and the interstitial layer was formed. Therefore, the formation of the intermediate layer itself can be affected by 2:. Yu Xun, the color cathode radiates ... the sub-emission capability (that is, the emissivity ... above

V. Description of the invention (21) There is almost no decrease in operating current density. In addition, the electron emission mechanism is the same as that of a general oxidation cathode, and the advantages of short activation time and low operating temperature are maintained. 'At least one kind of gold selected from the group consisting of chromium, button, molybdenum, tungsten and tungsten is a material component of the 12 branch materials and is used as a reducing agent for the family of emitting materials. Therefore, the emissive material filled in the holes 7 accelerates the reduction reaction and provides an excellent electron emission characteristic in a simplified manufacturing process. At least one metal selected from the group consisting of chromium, button, molybdenum, thorium, tungsten, and cobalt 'will not form an intermediate layer having an impedance during the reduction reaction of the electron-emitting material. Therefore, a reduction in electron emission ability or emissivity can be further suppressed. Preferably, the formed cathode sheet 11 is an average particle diameter of a sintered object 'nickel powder produced by setting the weight ratio of the emitting material powder to the recording powder in the range of 40% to 96%, set to 0.8. In the range of micrometers to 9 micrometers, antimony powder is generated by the decomposition of nickel tetracarbonyl nickel by the carbonyl method. In this case, excellent electron emission characteristics can be achieved. At the same time, it ensures that the sintered object has high mechanical strength in the mechanical manufacturing process of producing the cathode sheet. The density of the cathode sheet 11 is preferably more than 82% of the theoretical density because the mechanical density is not sufficient below 82% of the theoretical density. Preferably, the range of the coefficient of thermal expansion (i.e., the coefficient of linear expansion) of the 'cathode sheet 11 is set to 12x10-6 / £ to 20 > < 10-VK. If the thermal expansion coefficient of the cathode sheet is within this range, it will be almost equal to the sheet support 12, thereby suppressing the thermal stress between the cathode sheet 11 and the sheet support [2]. Therefore, the stability and reliability of the subassembly 19 can be guaranteed.

Page 25 469462 V. Description of the invention (22) Among the alloys of the supporting structure 12, at least one metal selected from the group consisting of chromium, tantalum, molybdenum, zirconium, tungsten and cobalt is preferably set to 丨% &Quot; to 33%. In this case, the electron emission, mechanical and thermal characteristics can be guaranteed. In particular, chromium is selected because of its low acquisition cost. The weight ratio of chromium to nickel is preferably set in the range of 19% to 30%. For the electron-emitting material powder, it is best to use the carbonate produced by barium, gill and calcium coprecipitate (ie, barium / gill / calcium carbonate coprecipitate ^). Even so, the average particle diameter of the hindering acid powder is preferably in the range of 0.9 to 7 m, which is similar to the average particle diameter of the powder. An additional advantage is that the holes 17 are filled in, and there is not too much or too little emitter material, so that the emitter material does not undergo abnormal stress' and provides excellent electron emission characteristics. In addition, in this case, the molar ratios of lock, record, and calcium are preferably: barium from 45 to 65; & from 30 to 50; calcium from 2 to 1 5 (that is, barium: gill: calcium = ( 45-65): ^ 30 50): (2-15)). This is because, as shown in FIG. 3, the film 23 made of an electron-emitting material is easily formed on the emission surface 13 of the cathode sheet 11 after the cathode decomposition process. As explained above, the cathode sheet 11 formed by the sintered object by machining has a special shape ', but thus also forms a depression (not shown) caused by nickel on the cathode sheet U emitting surface 13. Since the nickel depressions usually cover the holes 17 on the surface 13 ', the emitting material is prevented from emitting outwardly. In order to solve this problem and promote the formation of the emissive material film 23 ', it is preferable to grind the surface roughness (Rnax) of the surface 13 to 3 m or less' to remove the depression. / In order to enhance the electron emission ability, the thickness of the film 23 is preferably 20 to 150 microns. If it is thicker than 150 microns, it is difficult to generate electrons inside the cathode sheet 11.

Page 26 4 6 9 46 2 V. Description of the invention (23) Penetrating the film 23 to the outside world 'and reducing the number of electron emission. On the other hand, if it is thinner than 20 microns, the number of thunders generated on the surface 13 will be 詈; the lack of electricity for the king blade will also reduce the number of electrons emitted. In the cathode sheet 11, the weight ratio of the oxide powder to the combined emission material and recording powder in the sintered object is in the range of 1% to 7%, and the film can be 23 to 20 microns to 150 microns. Example: The present inventors did according to the present invention to produce a cathode sheet in the following method. b First, the cathode sheet 11 is produced in the following steps (J) to (4) .... (1) Provide a powder with an average particle size of 5 microns, and a carbonate (also That is, the barium / gadolinium / calcium carbonate co-precipitate 'minutes)' has an average particle diameter of 1 micrometer to 2 micrometers and barium: gill: mother's mole, 50: 40: 10. 100 g of nickel powder, 6 g of hafnium powder, and 60 g of barium / rhenium / calcium carbonate coprecipitate powder were uniformly mixed together to form a powder mixture. (2) The powder mixture is constrained by pressure forming processing at room temperature to form a plastic body. (3) The formed plastic body is placed in a glass container ’and the air is released from the container to form a special vacuum atmosphere. The vessel pressure was set at 10-4 Pa. At the same time, the breasts in the plastic body and the container were removed at about 500 times. (4) Put the container containing the plastic body into a hot equalizer for sintering. The highest pressure is set to 15 MPa, the highest temperature is set to 1100 ° C, and

4.69 46 2 V. Description of the invention (24) The highest temperature is kept for 30 minutes. During the sintering process, only the recording powder is actually sintered into a lattice structure containing many holes 17. The oxidized sharp powder and the barium / rhenium / calcium carbonate coprecipitate powder were not sintered and remained in the holes i 7 of the nickel structure. The formed holes 17 communicate with each other 'and are therefore called "open holes". The substance or object existing in the holes 17 can move or flow between adjacent holes 17 and reach the surface of the sintered object. During the sintering process, the barium / lithium / calcium carbonate co-precipitate powder cannot be decomposed into barium / rhenium / calcium oxide due to the high pressure (i.e., the highest pressure 500 MPa) supplied to the sintered object as described above. (5) After the heat equalizer has cooled down, remove the container from the machine and remove the sintered object from the container. The density of this sintered object is 85% of the theoretical density and the linear expansion coefficient at room temperature is 1 3. 0 X IO-6 / K, 100 t: 13. 5 X 10_6 / K, 13 at 20 0 ° C 6 X 1 0-6 / K, 15. 5 X 10-VK at 500 ° C, and 18. 0 X ΙΟ-6 / κ at 80 ° C. (6) The sintered object is cut into pieces with a diamond knife to form a sheet having a thickness of 0.5 cm. The slicing process uses a method publicly published by the present inventor in Japanese Unexamined Patent Publication No. 9-14 7742 in 1997. The surface of each sheet was ground with diamond slurry 'to form an abrasive sheet having a thickness of 0.22 cm and a surface coarseness of 1 micron. Then, each of the abrasive flakes was punched with a metal punching mold made of cemented carbide to form a disc-shaped cathode sheet 11 having a diameter of 1.1 cm and a thickness of 0.22 cm. Next, the cathode 10 is manufactured by using one of the methods for manufacturing the cathode sheet 11. On the other hand, a 50-micron-thick nickel-chromium alloy disc (nickel: 80 wt% ′ and 20 wt%) was subjected to drawing processing to form an inner diameter of 1.1 cm and

Page 28 ^ 69462 V. Description of the invention (25) A hat-shaped metal part with a depth of 0.2 cm. This metal portion is used as a sheet support 12. In addition, a 50-micrometer-thick nickel-chromium alloy disc (nickel: 80wt%, chromium: 20wt%) was subjected to another drawing process to form a cylindrical metal portion having an inner diameter of 1.2 cm to 2 cm and a length of 8 cm . This metal part is used as the sleeve 14. The cathode 10 is assembled by the following method. First, the cathode sheet 11 is placed in a sheet support 12. Then, a sheet support 12 containing the cathode sheet 11 is placed into the top end of the sleeve 14. The top end of the sleeve 14 is affected by the resistance of the welding process, so that the cathode sheet 11 and the sheet support 12 are fixed to the top end of the sleeve. Therefore, the cathode subassembly 19 is assembled. Finally, the heater 15 is inserted into the sleeve 14 via the bottom end. Therefore, the structure of the cathode 10 shown in FIG. 2 is completed. Following this step, the cathode 10 is installed in a color ray tube by a general method, and then the cathode sheet 11 is decomposed for about five minutes according to the special temperature variation curve of the general decomposition process shown in Fig. 4. Through the decomposition process, the barium / wrong / macroacid co-precipitate in the cathode sheet 11 is decomposed due to heat, resulting in lock / record / tritium oxide. Part of the barium / mineral / approximate oxide is gradually emitted from the emission surface 13 through the micropores 17 of the cathode sheet 11. As a result, a film 23 made of barium / Wei / fishing oxide and having a thickness of 50 m is formed on the surface 13, as shown in FIG. At this stage, the reaction (5) described earlier did not proceed sufficiently, so 'a little electron emission was observed. Then, the decomposition of the cathode sheet 11 was affected by the activation process at 1080 ° C for 15 minutes to increase the trapping reaction (5). As a result, sufficient low work function barium atoms were generated and sufficient electron emission was observed. The observed results are shown in Figures 5 and 6.

Page 29 4 6 9 46 2 ----------- 5. Description of the invention (26) " — Figure 5 shows the conventional technology of the cathode subassembly 79 and the initial stage of the cathode subassembly of the present invention. The emission current characteristic is a function of the driving voltage. The horizontal axis represents the driving voltage (volts), and the vertical axis represents the emission current (microamperes) ° 〇 From Figure 5, the secondary component? The initial emission current characteristics of 9 and 19 are not substantially different, in other words, the sub-assembly 19 of the present invention has substantially the same initial emission current characteristics as the sub-assembly 79. Considering subcomponents? The fuUy resistance of 9 conventional technologies is actually used, and it is found that the secondary component 19 of the present invention also has the full-impedance property of practical use in terms of the initial emission current characteristics. Fig. 6 shows the initial temperature characteristics of the cathode sub-assembly 19 of the present invention. The horizontal axis represents the temperature of the cathode (t The vertical axis represents the maximum cathode current MIk (microamperes). From Figure 6, the maximum cathode current M Ik is saturated at 780 ° C. In other words, the operating temperature of the cathode subassembly 19 is 78 °. 〇c. This is almost the same as the conventional technique of the sub-assembly 79. Therefore, the thermal resistance of the casing 14 is equivalent to the casing 73 of the sub-assembly 79, so the casing 73 can be applied to the casing 14. The operating temperature of the module 19 is the same as that of the sub-module 79, and the electron gun module does not need any thermal measurement. These points are of practical value. Figure 7 shows the maximum cathode current MIk change of the cathode sub-module 19 of the present invention. Obtained through continuous operation of the sub-assembly 19 at a current density of 3A / c # for 21 '0 0 0 hours. The horizontal coordinate represents the operating time (hours), and the vertical coordinate represents the ratio of the maximum cathode current M 丨 k to the initial maximum cathode current Mlk.

Page 30 46946 2 V. Description of the invention (27) --- From the view in Fig. 7, the current MIk can be reduced by a maximum of 4% to 5% within 21,000 hours. Considering such a small amount of reduction of the current M I k ′, it can be said that the brightness of the screen and the focusing efficiency (that is, the “resolution”) are almost equal to the initial values after the operation of 2, 〇 〇 〇 ^. In addition, the 'subassembly 19' has never been operated continuously under the strict conditions of a current density of 3 A / cm2 in a large-sized color polar tube. ^ It seems that at least no identifiable reduction in electron emission is observed during normal color cathode ray tube screen operation. As explained above, the cathode sub-assembly 19 according to the embodiment of the present invention, even the color cathode ray tube, generally has at least a lifetime during which its electron emission capability (ie, emissivity) is higher than 1A / cm2. There is almost no decrease in flow density. This means that a color yin-yang tube with a subassembly 9 is installed, and the brightness and resolution on the screen will not be displayed for a long time ^ = what is the identifiable reduction? And it is suitable for large-sized TVs or computer monitors. In the above explanation of the embodiment of the present invention, the entire sheet support 2 is formed from a main alloy containing nickel and at least one metal alloy selected from chromium, tantalum, molybdenum, tungsten, tungsten, and cobalt. However, the present invention is not limited to this structure, as long as the portion where the sheet support 12 and the cathode sheet 11 are in contact is formed with a main component ^ and at least one selected from the group consisting of chromium, button, molybdenum, zirconium, tungsten and cobalt Metal alloy is sufficient. In this case, it is needless to say that there are advantages compared with the above embodiment. Although the present invention is disclosed as above with a preferred embodiment, those skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. Range

Page 31

Claims (1)

1. A cathode subassembly, including 469462 VI. Patent application scope Electronic multi-porous cathode sheet, formed by sintered objects containing recording, oxide sharp (SC203) and wall-breaking miscellaneous materials; the above system uses heat The cathode sheet has an electron-emitting surface; and a part of the connecting piece ^ building Λ is used to support the cathode sheet. The above-mentioned sheet support > a # 2 cathode sheet; the above part is made of the main alloy containing nickel and the metal alloy selected by the group; at least-^ lei m + u molybdenum, tungsten, tungsten and The metal selected by the cobalt group is used as a reducing agent for the return electron emission material on the card. 2 · The cathode sub-group as described in item 1 of the scope of the patent application, where the above-mentioned electron emitting material powder is too L, ten, | & Shi Qu 'eight to 96 wt% powder weight ratio ranging from 40 wt% μ铳 ϋΠί The cathode sub-module according to item 1, wherein oxygen | from, =. The mixing ratio range of the total of the shooting material and the above-mentioned powder is 4, the average particle size range of the nickel powder of the cathode sub-group as described in item 1 of the patent application range is from 0.8 micrometers to 9, ... 5. The cathode subgroup nickel powder described in item 1 is produced from nickel tetracarbonyl nickel by the carbonyl method. There are 6 types of I: Please: The cathode sub-modules described in item 1 of Li Fwei, where the weight ratio of Fanyuan is set from 1% to 33 males. Cobalt drum group selected metal pair recording 2127-3149.PPi.ptc Page 33 4 6 9 4 6 2 --- Case No. 89112171 _Amendment of the main day of the month 6. Application for patents i ~ '~ 7, as described in the scope of the application for the cathode Components, in which the weight ratio of chromium to nickel selected from the group of chromium, button, molybdenum, tungsten, tungsten and cobalt is set from 19% to 30%. & 8. The cathode sub-assembly as described in item 1 of the scope of patent application, further comprising a film formed on the electron emission surface of the above cathode sheet, which is an electron emission having a thickness of 20 micrometers to 150 micrometers. Made of materials. ^ 9. The cathode sub-assembly as described in item 1 of the scope of patent application, wherein the above-mentioned electron emitting material is carbon produced from a coprecipitate of barium, hafnium, and calcium. i 0. The cathode sub-assembly according to item 9 of the scope of the patent application, wherein the carbonate is produced by the coprecipitate of barium, thorium and calcium, and has a special barium, pin and calcium mole ratio, barium: Ming : Calcium = (4 5 to 6 5): (3 〇 brake n n): (2 to 15 〇 Jb〇11 · The cathode sub-assembly as described in item 9 of the scope of patent application, wherein the carbonate is composed of barium, Produced by the coprecipitate of thorium and calcium, with an average particle size from 0.9 microns to 7 microns. 12. The cathode sub-assembly according to item 8 of the patent application range, wherein the above electron-emitting material is of barium, thorium and calcium Oxidation mixture. 13. The cathode sub-assembly according to item 12 of the scope of the patent application, wherein the above-mentioned barium, Ming and calcium oxides have special barium oxide, gill oxide and calcium oxide molar ratios. 'Barium oxide: oxidation勰: Calcium oxide = (45 to 65). (30 to 50): (2 to 15). 14. The cathode subassembly according to item 1 of the patent application scope, wherein the density of the sintered object is a theoretical density. 82% or more. 469 46 2 --- J-No. 8m 19171__ 亇 H Day_Amendment_ VI. Patent Application Range 1 5. The cathode sub-assembly described in item 1 of the patent application range, where the linear expansion coefficient of the upper f sintered object is below Temperature range from 30 ° C to 800. (Inside, the range is from 12x IO'6 / κ to 20x iQ-6 / κ. 1 6 · The cathode subassembly according to item 1 of the patent application scope, wherein the surface of the electron emission surface of the cathode sheet is rough The degree (Rmax) is set to be less than 3 microns. I 7. The cathode sub-assembly as described in item 1 of the patent application range, wherein the weight ratio of the electron emitting material powder to the nickel powder ranges from 40 wt% to 96 wt%. ; Wherein the mixing ratio of the above-mentioned oxide to the total of the electron-emitting material and the above-mentioned nickel powder ranges from iwt% to 7 wt%; wherein the average particle size of the above-mentioned ball powder ranges from 0 · 8 microns to 9 microns; wherein the above-mentioned nickel powder is Produced from the tetracarbonyl nickel by the carbonyl method; the weight ratio range of chromium to nickel selected from the group of chromium, button, molybdenum, zirconium, crane and Ming is set from 9% to 30%, and the above-mentioned acid breaking The salt system is produced by the co-sediment of barium, wrong and feed. 'It has a special molar ratio of barium, lithium and calcium, barium: strontium: calcium = (4 5 to 65): (30 to 50): (2 to 15 18) The cathode sub-assembly according to item 1 of the scope of patent application, wherein the above-mentioned electron emitting material The weight ratio of the above nickel powder ranges from 40w1;% to 96 wt%; wherein the mixing ratio of the above hafnium oxide to the total of the electron emitting material and the above nickel powder ranges from 1 wt% to 7 wt%; wherein the above nickel The average particle size of the powder ranges from 0.8 micrometers to 9 micrometers; the above nickel powders are produced from the tetracarbonyl nickel by the carbonyl method; and the chromium pairs selected from the group of chromium, button, molybdenum, tungsten, crane, and recording The weight ratio range of the recording is set from 19% to% '. Among them, the above electron-emitting materials are produced by the coprecipitate of barium, strontium and calcium. 2127-3149-PFl.ptc Page 35 46946 2 89112171 = J acid :: The above carbonates in 4 have special barium, gills and calcium mol, · yttrium. Calcium = (45 to 65): (30 to 50): (2 to 15) 6. Objects for patent application: The range is from '9 micron to 7 micron; among them, 82 of the above-mentioned sintered body line; and among the above-mentioned sintered object X 1 〇4 ^ r & 130〇c ^ 800 ^^ r, i ^ 12 a-color cathode The ray tube includes a cathode sub-assembly, and the basin is characterized in that the cathode sub-assembly includes: /, Fu Ao (a)-a multi-porous cathode sheet, formed by an island ^ a, a sintered object of an electron-emitting material. S 4) made with a heat-sintered mixture of compacted sintered nickel powder and hafnium oxide (Sc20); the above-mentioned cathode sheet i electron-emitting material powder Cb); a part of which is in contact with the above-mentioned cathode sheet; on " " One of the above-mentioned sheet supports is one of the two (M〇), zirconium (Zr) selected from the group consisting of chromium (Cr) and molybdenum (Ta) 4 parts consisting of nickel and rhenium and cobalt (Co) as main components ), Tungsten species are made from chromium, niobium, indium, #, tungsten, and the combination of 'at least-the reducing agent for the electron emission material. The selected metal is used as above