TW494441B - Emitter material for cathode ray tube and a method for manufacturing the same - Google Patents

Abstract

An emitter material for a CRT comprises a mixed crystal or a solid solution of at least two kinds of alkaline earth metal carbonate, in which at least one alkaline earth metal carbonate is dispersed or separated in the mixed crystal or solid solution. The alkaline earth metal carbonate, which is a material for an emitter 4 for the CRT, is coated onto the base metal 3 and thermally decomposed in a vacuum to from an emitter of an alkaline earth metal. This emitter, which is proper for a larger screen size, high brightness and high resolution CRT, can be provided with enough life characteristics even under the operating condition of the emission current density of 2A/cm<SP>2</SP>.

Description

494441 Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs A7 B7 V. Description of the Invention (/) [Technical Field of Invention] The present invention relates to a cathode-ray tube emitter material used in televisions or displays. [Explanation of Conventional Technology] So far, alkaline earth metal thorium carbonate for cathode ray tubes has been a binary mixed aqueous solution of barium nitrate and thorium nitrate, or a ternary mixed aqueous solution obtained by adding calcium nitrate to the above binary mixed aqueous solution. In the process, sodium carbonate aqueous solution or ammonium carbonate aqueous solution M is added to the reaction at a predetermined rate, and binary (Ba, Sr) rhenium carbonate or ternary (Ba, Sr, Ca) rhenium carbonate is synthesized by precipitation. As such a method, for example, a sodium carbonate precipitation method is known. This sodium carbonate precipitation method refers to the addition of carbonic acid as a precipitation agent in a binary mixed holmium nitrate aqueous solution composed of barium nitrate and thallium nitrate, or a ternary mixed nitric acid aqueous solution composed of barium nitrate and thallium nitrate and calcium nitrate. Precipitation method of aqueous sodium solution and synthetic alkaline earth metal rhenium carbonate. The following two methods are represented by the following formulas (Chem. 丨) and (Chem. 2) in K: (Chem. 1) (Ba, Sr) (N〇3) 2 + Na2C〇3 〇Ba, Sr) C 〇3 + 2NaN〇3 [Chemical 2] (Ba, Sr, Ca) (N〇3) 2 + Na2C〇3 — (Ba, Sr, Ca) Co3 + 2NaN 03 was synthesized by the sodium carbonate precipitation method The X-ray diffraction analysis of the binary thorium carbonate and tertiary thorium carbonate 'M wavelength λ 54nm can be found, which show the diffraction patterns shown in Figure 18 and Figure 19, respectively. From Figure 1-8,-3-This, ', and Zhang scales are applicable to the Chinese National Standard (⑽) M specifications (training 297 public directors) — — — — ——— 0—, (Please read the precautions on the back before (Fill in this page)

1T 494441 A7 B7 V. Description of the invention (less) 19 It can be seen that the plane interval is between 33nm and 0.411111, that is, the diffraction angle is between 2 2 ° and 2 7 ° C (Figures 18, 19) The part between the two dashed lines), there is only one peak. The number of peaks in the above range is not changed when the synthesis conditions such as the reaction temperature or the concentration of the aqueous solution in the stomach δ carbonic acid are changed, and the same is obtained even if the precipitant is changed to ammonium carbonate. result. Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). It: owed to the above alkaline earth metal rhenium carbonate, containing 630 weight p pm of yttrium oxide to form a mixture, It is dispersed in a solution prepared by adding a small amount of nitrocellulose to a mixed medium of diethyl oxalate and diethyl acetate to make a dispersion. The dispersion was coated and fixed on the cathode substrate, and then thermally decomposed in a vacuum to generate an emitter having an alkaline earth metal oxide as a main component as a cathode, and operated at a current density of 2A / cm2 and 3 A / cm2. The results of the investigation of the relationship between the operating time and the residual rate of radiation current are shown in Fig. 20. The line a in Fig. 20 shows the case where the M binary ytterbium carbonate is an emitter and the M current density is 2A / cmz. The line b represents the case where the K ternary ytterbium carbonate is an emitter and the K current density is 2A / cm2. In this case, the line e indicates the case where K ternary ytterbium carbonate is an emitter and K current density is 3 A / cm 2. Radiation current residual rate means that the radiation current at the beginning of the M operation is 1 and the value of the radiation current relative to the operation time is normalized (the ratio of the radiation current value when the initial value of the radiation radiation current is 1 (K ratio is expressed)), The larger this value, the better the electron emission characteristics. It can be seen from Fig. 20 that under the action of current density 3A / cm2, whether it is binary or ternary, the residual current rate of radiation is quite low. In this regard, the radiation of this paper is 4- Chinese paper standard (CNS) A4 specification ( (210X297 mm) Α7 Β7 V. Description of the invention (4) ® § 2A / cm2, the current density is allowed to be high. When the dimension is high, the electrical material is not degraded. The brightness emitter is made with high-brightness radiation or Gao Qiyue down, use the shooting surface. The problem of drawing strong lines on the ground pipe is to draw the strong shots. The big world is very close to the pursuit of the karma, and the power of the full line is used to shoot the habit 2 asexual D is extremely According to the question, the question of Yin on the root C, and the year of the line, ,,, and shooting will be near the exhibition, and A's life will be solved. The degree of transcendence is over the time. The image density is the same as the image density. (Please read the precautions on the back before filling out this page.) The central government bureau of the Ministry of Economic Affairs, the Consumer Cooperative, printed this invention. Provides an emitter material for cathode ray tubes that can maintain sufficient life even when used under radiation with a current density exceeding 2A / c m2, and is suitable for large-screen, high-brightness, and high-resolution. [Solutions for solving the problem] In order to achieve the above-mentioned object, the emitter material for cathode ray tubes of the present invention is an emitter material for cathode ray tubes containing mixed crystals or solid solutions of at least two alkaline earth metal rhenium carbonate, which are characterized by: At least one of the alkaline earth metal rhenium carbonate is dispersed or separated in the upper mixed crystal or solid solution. The mixed crystal or solid solution referred to here refers to the osmium substance on the two components M, which is formed into a crystalline solid. The term "dispersion" refers to a situation in which mixed crystals or solid solutions are mixed with ordinary crystalline and M crystal particles. Separation refers to the phenomenon that the components in a crystal of rubidium carbonate are biased in the crystal. -5- This paper size applies to Chinese National Standard (CNS) A4 (210X297 mm). 4441 Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. A7 B7. 5. Description of the invention (small) In the above mixed crystal or solid solution, In the structure in which at least one kind of crystal particles of alkaline earth metal rhenium carbonate is dispersed, the average particle diameter of the dispersed alkaline earth metal rhenium carbonate crystal particles is 1/3 times the average particle diameter of the mixed crystal or solid solution. Those within the range of 3 times above Μ. Here, the average particle diameter refers to the average value of the length in the major axis direction (the field of spherical crystal particles, the diameter) of each crystal particle. In the above-mentioned configuration, the average particle diameter of the dispersed alkaline earth metal rhenium carbonate is preferably within a range of 2 / imM to 5 umK. In the above-mentioned configuration, the alkaline earth metal rhenium carbonate has two peaks on K at a plane interval of 0, 33 nm to 0 40 40 nm in the X-ray diffraction pattern. As another analysis and identification method, there is a method of analyzing the distribution states of B a, S r, and C a in the thorium carbonate crystal of the emitter material using an X-ray microanalyzer. In the above configuration, at least two kinds of alkaline earth metal europium carbonate are preferably composed of barium europium carbonate and europium europium carbonate. In the composition of the above, the alkaline earth metal thorium carbonate, the barium thorium carbonate and thallium thorium carbonate are used for cathode ray tube emitter materials, and the alkaline earth metal thorium carbonate is preferably 0.1% by weight to 70% by weight. Those who exist are dispersed or separated within the following range. In the above configuration, at least two kinds of alkaline earth metal rhenium carbonate are preferably composed of barium rhenium carbonate, rhenium rhenium carbonate, and calcium rhenium carbonate. In the above composition, the alkaline earth metal thorium carbonate, a barium thorium carbonate, thallium thorium carbonate, and thallium thorium carbonate is a cathode material for a cathode ray tube-6- ^ Paper size applies Chinese National Standard (CNS) M specification (210x297 (Mm) ------: —— #! (Please read the notes on the back before filling this page),? Τ 494441 A7 B7 5. In the description of the invention (&lt;), alkaline earth metal rhenium carbonate should be in 0 ♦ 1% by weight or more and 60% by weight of K are dispersed or separated in the range. In the above structure, it is preferable that the emitter material for a cathode ray tube further contains at least one substance selected from the group consisting of a rare earth metal, a rare earth metal oxide, and a rare earth metal rhenium carbonate. In the upper structure, it is preferable to co-deposit the atomic number of atoms that contain the alkaline earth metal relative to the material of the emitter, ranging from 5500 to 950 p pm. Secondly, the method for producing an emitter material for a cathode ray tube according to the present invention is a method for producing an emitter material for a cathode ray tube containing at least two alkaline earth metal rhenium carbonate mixed crystals or a solid solution, which is characterized in that: In the aqueous solution, at least two alkaline earth metal rhenium nitrate aqueous solutions are added at different rates of addition. In the above method, it is preferable to disperse at least one kind of crystal particles of the soil metal rhenium carbonate in the mixed crystal or solid solution so that the average particle diameter of the crystal particles is relative to the average particle diameter of the mixed crystal or solid solution. , Within the range of 1/3 times M and 3 times K. Printed by the Consumer Cooperatives of the Central Bureau of Standards, Ministry of Economic Affairs (please read the precautions on the back before filling this page). In the loading method, it is advisable to disperse the soil-testing metal rhenium carbonate in the mixed crystal or solid solution. At least one kind of crystalline particle, so that the average particle diameter of the crystalline particle is in a range of 2 um K and 5 am Μ. In the above method, thorium carbonate, an alkaline earth metal, should have two peaks on the surface of the X-ray diffraction pattern. ♦ The surface interval between 0 and 40 nmM at 33 nmK. -7- I. 'This paper size applies to Chinese National Standard (CNS) A4 specification (210X 297 mm) 494441 A7 B7 V. Description of the invention (L) In the method of winding up, at least two alkaline earth metals rhenium carbonate, should be It consists of barium ytterbium carbonate and ytterbium ytterbium carbonate. In the above method, alkaline earth metal ytterbium carbonate and cathode ray tube emitter materials composed of barium ytterbium carbonate and ytterbium ytterbium carbonate are alkaline earth. Metal rhenium carbonate is dispersed or separated in a range of 0 to 1% by weight K and 70% by weight K. In the above method, at least two kinds of alkaline earth metal rhenium carbonate are preferably composed of barium rhenium carbonate, rhenium rhenium carbonate, and calcium rhenium carbonate. In the above method, the alkaline earth metal thorium carbonate, a barium thorium carbonate, thallium thorium carbonate, and thallium thorium carbonate, is used in cathode ray tube emitter materials. The alkaline earth metal thorium carbonate is at 0,1% by weight K. Those who are dispersed or separated in the fan garden below 60% by weight K. In the above method, it is preferable that the emitter material for a cathode ray tube further contains at least one substance selected from the group consisting of a rare earth metal, a rare earth metal oxide, and a rare earth metal rhenium carbonate. Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page) In the above method, it is advisable to co-deposit the number of atoms containing the alkaline earth metals that constitute the material of the emitter, 550 ~ 95 0 ppm of yttrium atom. According to the present invention, at least one kind of alkaline earth metal rhenium carbonate exists in the crystal of the alkaline earth metal rhenium carbonate. Therefore, it is used under the radiation of a current density exceeding 2A / cm2, that is, a current density of 3 A / cm2. It can still maintain a sufficient life span, which can further realize the daylightening, high brightness or high resolution of the cathode ray tube. In addition, -8- This paper size will be distributed in accordance with the Chinese National Standard (CNS) A4 specification (210X297 mm) 494441 A7 B7 printed by the Consumers Cooperative of the Central Bureau of Standards, Ministry of Economic Affairs, at least one of the invention description (γ) The average particle diameter of the alkaline earth metal rhenium carbonate crystals is formed within the above range, and the radiation drop can be suppressed to be small. Here, the decrease in radiation refers to a phenomenon in which it takes several seconds to several minutes until the current stabilizes, starting with electron emission, and during this time, a slightly smaller current gradually decreases. In addition, in order to realize these properties, the X-ray diffraction pattern of the alkaline-earth metal rhenium carbonate crystals of the cathode material for the cathode ray tube has two peaks at K in the plane interval of 0 ♦ 33nm to 0 • 40nm. In an aqueous solution containing carbonate ions, when K is added at different rates of alkaline earth metal rhenium carbonate synthesized by an aqueous solution of two alkaline earth metals rhenium nitrate, at least one alkaline earth metal rhenium carbonate in the rhenium carbonate crystal is biased. Even if it is used under the radiation of a current density exceeding 2A / cm2, that is, a current density of 3 A / cm2, it can still maintain a sufficient life, and can achieve a large screen or high resolution of the cathode ray tube. Regardless of the occasion of the above, the constituent elements of the crystals of the alkaline earth metal rhenium carbonate are barium rhenium carbonate and rhenium rhenium carbonate or barium rhenium carbonate and erbium rhenium carbonate and calcium rhenium carbonate. Particularly good radioactivity can be obtained. Realize large screen, high brightness or high resolution of cathode ray tubes. In any of the above cases, by including at least one of a rare earth metal, a rare earth metal oxide, and a rare earth metal rhenium carbonate in the crystal of the alkaline earth metal rhenium carbonate, a cathode ray capable of obtaining good radioactivity can be realized. Larger screen or higher brightness or higher resolution of the tube. In addition, relative to the number of atoms of the alkaline earth metals constituting the material of the emitter, the gold and ethyl atoms are contained in the range of 550 to 950 ppm by the co-deposition method, which can make this paper scale applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) ---------- ^ clothing-(Please read the precautions on the back before filling out this page) Order 494441 Printed by the Employees' Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs Α7 Β7 V. Invention description ($)

The reduction of the thermal decomposition temperature is about 100 ° C lower than the non-containing case, so that the thermal decomposition time can be shortened and the manufacturing cost can be reduced. In addition, according to the manufacturing method of the present invention, a cathode material for a cathode ray tube can be used. Efficient and reasonable manufacturing. [Embodiments of the Invention] Hereinafter, the spring embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a schematic structural view of a spring embodiment of a cathode using a material for a cathode ray tube of the present invention. The above-mentioned cathode is composed of: a heating coil 1, a cylindrical sleeve 2 made of nickel-chromium alloy with built-in heating coil 1, and a nickel-tungsten alloy containing a trace amount of magnesium provided at the opening of the sleeve 2 The cover-like base body 3, M, and an emitter 4 as an emitter material for a cathode ray tube that is covered and fixed on the base body 3 are formed. The emitter 4 is composed of at least two kinds of alkaline earth metal gadolinium carbonate mixed crystal or solid solution in which at least one kind of alkaline earth metal gadolinium carbonate is dispersed or separated. Thermal decomposition in a vacuum forms an alkaline earth metal oxide layer. [Examples] The following examples further illustrate the present invention in detail. (Embodiment 1) The first embodiment of the present invention will be described with reference to the κ diagram. _ 1 0 A paper size is applicable to Chinese National Standard (CNS) A4 specification (210 × 297 mm) (Please read the precautions on the back before filling this page), tr 494441 A7 B7 V. Description of invention (/) will be precipitated by sodium carbonate The binary europium carbonate having a diffraction pattern of X-rays as shown in FIG. 18 was mixed with B a C 0 3, K weight ratio of 2: 1, and this was used as mixed europium carbonate A. Then, the above-mentioned secondary europium carbonate was mixed with S r C 0 3 and M in a weight ratio of 2: 1, and this was used as a mixed europium carbonate. Next, the above-mentioned secondary europium carbonate was mixed with a ratio of B a C 0 3 to S r C 0 3 and a weight ratio of 4: 1: 1, and this was used as mixed europium carbonate. Regarding the production method of binary rhenium carbonate, firstly, 5 kg of barium nitrate and 4 kg of rhenium nitrate are dissolved in 100 liters of warm water at 80 ° C, and the aqueous solution is referred to as W liquid. Second, sodium carbonate 8 kg is dissolved in warm water at 80 ° C, this aqueous solution is used as the X liquid, the W liquid is fully stirred, and it is maintained at 80 ° C, and then the X liquid K is pumped at a rate of 2 liters per minute It is added to the W solution, and (B a, S r) osmium carbonate is precipitated. After taking out this carbonic acid carbonate KK core separator, it is dried at K 1 40 ° C to obtain binary osmium carbonate. Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). Take a sample of the crystals of the above mixed mixed carbonates A, B, and C, in the same way as the use case X-ray diffraction analysis was performed, and it was found that they have the diffraction patterns shown in FIG. 2, FIG. 3, and FIG. 4. It can be seen from Fig. 2 that the interplanar interval is between 0, 3 3 nm and 0 · 4 0 nm, that is, the diffraction angle is between 2 2 ° and 2 7 ° (the part enclosed by the dotted line in the figure). Unlike the conventional case (Figure 18), the diffraction pattern has two spikes. As shown in Figure 3, the mixed rhenium carbonate B can be located at a plane interval of 0 ♦ 3 3 nm to 0 ♦ 4 0 nm, that is, a diffraction angle between 2 2 ° to 2 7 ° (the part enclosed by the dotted line in the figure) Different from the conventional use case (Figure 18), the diffraction pattern-1 and ^^ The paper size applies the Chinese national standard (0 milk) 8 4 specifications (210 '乂 297 mm) 494441 A7 B7 V. Description of the invention (t C) The case has three spikes. In addition, it can be seen from FIG. 4 that the rhenium carbonate is mixed at a surface interval of 0 · 33nm to 0 ♦ 40nm, that is, a diffraction angle of 22 ° to 27 ° (the part enclosed by the dotted line in the figure), and Different from the common use case (Figure 18), the diffraction pattern has four spikes. Next, 630 wt ppm of yttrium oxide was added to the mixed rhenium carbonate A, B, and C to form a mixture, and dispersed in a mixed medium of diethyl oxalate and diethyl acetate (diethyl oxalate: diacetate The volume ratio of ethyl ester = 1: 1) was added to a solution prepared by adding a small amount of nitrocellulose (equivalent to 1 to 1 to 5 g of the mixed medium) to prepare a dispersion. The dispersion liquid M was coated and fixed to a thickness of about 50 am, and was thermally decomposed in a vacuum at M 93 0 ° C to produce a cathode as shown in FIG. 1 having an emitter made of an alkaline earth metal oxide. Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). The cathodes obtained according to this will be subjected to a life test at a current density of 3 A / cm 2 to investigate the changes in radiation current. The relationship between the operating time and the residual ratio of the radiation current was obtained as shown in FIG. 5. Line A in FIG. 5 indicates the case where mixed rhenium carbonate is used, line B indicates the case where mixed rhenium carbonate B is used, line C indicates the case where mixed rhenium carbonate is used, and line d indicates the case described in the usage example. In the case of binary thorium carbonate (hereinafter referred to as the first use case). It can be seen from FIG. 5 that if mixed ytterbium carbonate A and B are used, for example, at the operation time of 2000 hours, the residual ratio of the radiated current is 0 ♦ 25 compared with the conventional case 1, and the two are increased to about 0 ♦ 5 and about 2 times. Furthermore, if mixed rhenium carbonate is used, the residual current ratio of radiation current is 0 * 68, which is increased to about 2 * 5 times of the first use case, which is much higher than the use case -12.-This paper applies to China National Standard (CNS) A4 specification (210X297 mm) ^ 41 A7 B7 V. Description of the invention (/ 7)

The current density of the polar radioactive material ib, high resolution is mixed with the characteristics of the alkaline earth ray tube of B a, as a result. This period of radioactivity) and I (internal system allowable △ I = (I ϋ is the range of the use of chemical compound carbon carbonate C 0 3 metal carbon radiation polar particles, radiation flow value I 0). (5) Μ The expected ratio of 塩 A, and Sr acid 借, which can be used fully, is to use, the ratio of the difference between the diameter and the drop △ (0) is determined by mixing 塩 A carbonate, the large picture of the foot cathode ray tube, and B * C will be mixed The average particle diameter of the dispersed C 0 3 is determined by the same method as described above, and the relationship between the K current density 3 A / c and the radiation drop is obtained as I, as shown in the following formula (1), and the radiation (%) after 5 minutes is expressed as

B or C as a negative surface, high brightness and various changes in binary europium carbonate, and this is used as the cathode mz measurement. The results shown in Figure 6 are relative to the initial current value I (5 words, soil 5% K-I ( 0)) / 1 (0) X100… (1) (Please read the notes on the back before filling out this page) • LI. »Γ Printed by the Consumer Cooperatives of the Central Standards Bureau, Ministry of Economic Affairs, Figure 6, lines A, B, C represents a case where rhenium carbonate A ·, B, and C are mixed, respectively. P in FIG. 6 is a ratio of the average particle diameter of B a C 0 3 or S r C 0 3 to the average particle diameter of the binary europium carbonate. It can be seen from FIG. 6 that the mixed gadolinium carbonate A, B, and C are all, and the radiation decrease is related to the average particle diameter of the mixed dispersed BaC03 and SrCOs, and the average particle diameter of the binary gadolinium carbonate compared to the mixed crystal or solid solution. , The minimum is 1 time, if it is within the range of about 1/3 to 3 times, it falls within the allowable range. K is the average particle diameter of B a C03 and Sr C03 mixed and dispersed in the binary europium carbonate from the viewpoint of a sudden drop of radiation, which is about 1/3 times the average particle diameter of the binary europium carbonate ~ A range of 3 times is sufficient. Also, Binary Carbonium Carbonate 1 3-This paper size is applicable to Chinese National Standard (CNS) A4 (210X297 mm) 494441 Printed by Employee Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs Α7 Β7 V. The average of the description of the invention (//) The particle size varies greatly depending on the synthesis method, and is mostly about 2 to 5 nm. When P is near 1, 'Δ 1 is the smallest. Therefore, when the average particle diameters of B a C 0 3 and S r C 0 3 are in the range of 2 to 5 am, the relative radiation decreases, and the effect. Alkaline earth metal rhenium carbonate mixed with rhenium carbonate A, B, and C was prepared by mixing and dispersing the ratio of BaC03 and SrC03 in binary rhenium carbonate, and used as the cathode ray according to the same method as above. The tube emitter was used, and a K current density of 3 A / cmz was used as a life test. The relationship between the mixing ratio and the radiated current obtained the results shown in FIG. 7. R in FIG. 7 refers to the mixed rhenium carbonate A, which is a value obtained by dividing the weight of the mixed bismuth carbonate by the total weight of the mixed rhenium carbonate; for the mixed rhenium carbonate B, it is the mixed S r C〇3 The weight of the mixed holmium carbonate is divided by the total weight; for mixed holmium carbonate C, the weight of the mixed B a C 0 3 and S r C 0 3 is divided by the total weight of the mixed holmium carbonate. . The radiated current represents the value (current ratio) of the radiated current at the operating time of 2000 hours and the radiation current at the operating time of 2000 hours of the M conventional example. Lines A, B, and C in FIG. 7 represent the cases where rhenium carbonate A, B, and C are mixed, respectively. It can be seen from FIG. 7 that the radiated current is the maximum when the mixed rhenium carbonate A and B are in the vicinity of a mixing ratio of 30% by weight. Moreover, even if BaCOs or S r C 0 3 is mixed in a small amount, a more conventional use case 1 can be obtained. More good radioactivity. However, when the mixing ratio exceeds about 70% by weight, the radiated current will be smaller than the conventional use case, which is not desirable. It is M, and the Chinese paper standard (CNS) Α4 specification (210X 297 mm) applies to the binary paper size. ------------ (Please read the precautions on the back before filling this page) Order 494441 A7 B7_____ 5. Description of the invention (丨 々) The ratio of B a C 0 3 and S r C 0 3 mixed and dispersed in rhenium carbonate may not exceed 70% by weight. (Example 2) Below K, here is the second embodiment of the present invention, which is illustrated by the K chart. Figure 18 shows the ternary tritium carbonate with a diffraction pattern synthesized by the sodium carbonate precipitation method, and B a C 0 3 was mixed at a ratio of 2: 1, and this was used as the mixed fluorene carbonate D. The above ternary rhenium carbonate is a solution of barium nitrate 4 ♦ 8 kg and rhenium nitrate 3 ′ 8 kg and calcium nitrate 0 ♦ 7 5 kg in 100 liters of warm water at 80 ° C. This aqueous solution is used as the Y liquid. Secondly, dissolve 8 kg of sodium carbonate in 35 liters of warm water at 80 ° C, use this aqueous solution as the Z liquid, and stir the Y liquid while keeping it fully at 80 ° C to send The liquid pump added Z liquid M at a rate of 2 liters per minute to the mash, and precipitated into (B a, S r, Ca) rhenium carbonate. After taking out the centrifugal carbonic acid separator, it was dried at 140 ° C to obtain tribasic carbonic acid. Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). Take a part of the crystals of the mixed Dysprosium Carbonate D and perform X-ray diffraction analysis in the same way as above. There are two sharp peaks between the surface interval of 0 ～ 0 ♦ 40 nm, which is roughly the same as that of FIG. 2 [Diffraction pattern of Division. Then, 63% by weight of yttrium oxide was added to the mixed ytterbium carbonate as a mixture, and it was used as an emitter for a cathode ray tube in the same manner as described above. The life test was performed at a current density of 3A / cm2, and the operating time was The relationship with the residual ratio of radiated current was obtained as shown in Figure 8. -15- This paper size is applicable to the Chinese National Standard (CNS) A4 (210X 297 mm) 494441 A7 B7_ V. Description of Invention (/ #) Central Standard of the Ministry of Economic Affairs Printed by the Bureau ’s Consumer Cooperatives (please read the notes on the back before filling this page) Results. The line D in FIG. 8 shows a case where a mixed rhenium carbonate D is used. The line e shows a case where a ternary rhenium carbonate in a use case is used (hereinafter referred to as a second use case). It can be seen from FIG. 8 that if the mixed dysprosium carbonate D is used, for example, when the operation time is 1000 hours, the residual current ratio is increased to about 0.5 and about 2 times from 0 * 2 5 of the conventional example 2. Achieve higher current density than the conventional use case 2. It is M. By using mixed ytterbium carbonate as a cathode and emitter material, it can meet the expectations of large screen, high brightness, and high resolution in a cathode ray tube. Also, here is an example of mixing B a C 0 3 with ternary rhenium carbonate, but if S r C 0 3 is mixed with ternary rhenium carbonate, B a C 0 is simultaneously mixed with ternary rhenium carbonate. 3 and S r C 0 3, respectively, can achieve the same high current density as in the case of the mixed rhenium carbonate B and the mixed rhenium carbonate C, respectively. For the decrease in radiation, if the average particle diameter of the mixed B a C 0 3 and S r C 0 3 relative to the average particle diameter of the ternary lutetium carbonate is in the range of 1/3 to 3 times the same as that in Example 1 above If so, it can be suppressed to less than 5 soil. Furthermore, an alkaline earth metal rhenium carbonate mixed with various ratios of B a C 0 3 and S r C 0 3 in ternary erbium carbonate can also be prepared and used as a cathode ray tube for radiation in the same manner as described above. The electrode is used, and the life test is performed at a current density of 3A / cm2. In terms of the relationship between the mixing ratio and the radiated current, compared with the case where the rhenium carbonates A, B, and C are mixed (Fig. 7), the shapes of the curves are different, but when R is 30% by weight, the radiated current is the maximum. However, when R exceeds about 60% by weight, the radiation current is smaller than that in the conventional example 2, which is not satisfactory. It is K, mixed and dispersed in ternary tritium carbonate, B a C 0 3 -16- This paper size is applicable to Chinese National Standard (CNS) A4 specification (210X 297 mm) 494441 A7 ________B7___ 5. Description of the invention (Buyer 0 and S r The ratio of C 0 3 is preferably less than 60% by weight when mixing only B a C 0 3 or when both B a C 〇3 and S r C 〇3 are mixed. (Example 3) Below K, the third embodiment of the present invention is illustrated in Figure K. Barium nitrate, ytterbium nitrate, and sodium nitrate are dissolved in pure water to prepare a barium nitrate aqueous solution (K), a rhenium nitrate aqueous solution (L), and carbonic acid. Sodium aqueous solution (N). Concentrations of K, L, and N above are all 0.5 mol / liter. Secondly, sodium carbonate aqueous solution (N) heated to a temperature of 80 ° C. Employees of the Central Standards Bureau of the Ministry of Economic Affairs Printed by a consumer cooperative (please read the precautions on the back before filling out this page) In 60 liters, add K 30 liters at different rates of K, add 80 ° C barium nitrate aqueous solution (K), thorium nitrate aqueous solution ( L), precipitation to generate alkaline earth metal rhenium carbonate. According to this embodiment, the rate of addition of K and L in the synthesis reaction of rhenium carbonate The degree is set to two types shown in Figure 9 and Figure 10. First, the first type is shown in Figure 9, where the rate of addition of K is always constant, and the rate of addition of L is gradually reduced. As shown in Figure 9 The alkaline earth metal rhenium carbonate composed of barium osmium carbonate and osmium osmium carbonate is defined as osmium carbonate E. The second type is shown in Fig. 10, and the addition rate of K increases slowly and the addition of L The rate is slowly decreasing. The alkaline earth metal rhenium carbonate composed of barium osmium carbonate and osmium osmium carbonate synthesized at the addition rate shown in Fig. 10 is designated as osmium carbonate F. Secondly, the crystals of EA and F carbonate are hereby crystallized. A part of the sample was sampled separately, and the X-ray diffraction analysis was performed in the same manner as above, and it was found that the diffraction patterns shown in Figure 11 and Figure 12 were displayed respectively. From the paper size of the drawing, the Chinese National Standard (CNS) was applied. Α4 specification (210 × 297 mm) 494441 A7 B7 V. Description of the invention (A) 1 1 It can be seen that when the diffraction angle is between 22 ° ~ 27 °, the case of rhenium carbonate E and binary rhenium carbonate in the conventional use case (Fig. 1 8 ) Is different, the diffraction pattern has two peaks. It can be seen from the figure that the diffraction angle is 22 ° ~ 27. In the case where rhenium carbonate F is different from the binary rhenium carbonate case (Figure (8)), the diffraction pattern has three peaks. Second, add 6 3 to rhenium carbonate E and rhenium carbonate F, respectively. 0 weight p pm of yttrium oxide to form a mixture, and use it as a cathode ray tube emitter in the same way as above, K current density 3 A / cmz as a life test, the relationship between the operating time and the residual ratio of radiation current, The results shown in Fig. 13 are obtained. The line E in Fig. 13 represents the case where rhenium carbonate is used, the line F represents the case where rhenium carbonate is used, and the line d is the case where the conventional example 1 is used. It can be seen from FIG. 13 that, for example, under the operation time of 2000 hours, the residual current ratio of radiation current is 0. 25 compared with the conventional example 1, rhenium carbonate E is 0, 55, and rhenium carbonate F is 0, 78. Use case 1 can be increased to about 2 times and about 3 times, respectively, which can achieve higher current density than the use case 1 printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). It is K. By using erbium carbonate E and erbium carbonate F as cathode emitter materials, it can meet the large-scale expectations, high brightness, and high resolution of cathode ray tubes. Next, in the case that ytterbium carbonate was not added with yttrium oxide, it was used as a cathode ray tube emitter in the same manner as above, and a life test was performed at a current density of 3A / cm2, and the operating time and radiation current remained. By comparison, the results shown in Figure 14 are obtained. The lines F, G, and d in Figure 1 indicate the cases where 630 weight ppm of yttrium oxide is added. A paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 494441 A7 B7 V. Description of the invention (丨 y), in the case where yttrium oxide is not added to ytterbium carbonate, and in the case of the first use case. It can be seen from FIG. 14 that, for example, when the operating time is 2000 hours, the residual radiation current ratio is relatively better than the conventional example 1, regardless of whether yttrium oxide is added or not. The effect is particularly good when yttrium oxide is not added. Big. It is K and M to add rare earth metal oxides such as yttrium oxide, which is particularly preferable in terms of radioactive life. Even if it is not added, it can obtain higher radioactive energy than the conventional example 1. (Embodiment 4) Next, the fourth embodiment of the present invention will be described with reference to FIG. Barium nitrate, thorium nitrate, calcium nitrate, and sodium carbonate were each dissolved in pure water to prepare a barium nitrate aqueous solution (K), a thallium nitrate aqueous solution (L), a calcium nitrate aqueous solution (M), and a sodium carbonate aqueous solution (N). Κ, L, M, printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page). The concentration of Ν is 0 · 5 Mo / L. Secondly, in the N70 liters heated to 80 ° C, K30 liters, L30 liters, and M10 liters of 80 ° C were added at different addition rates, and the alkaline earth metal rhenium carbonate was precipitated. The addition rates of K, L, and M in this synthesis reaction are shown in Figure 15. As shown in FIG. 15, the addition rate of K in this embodiment is gradually increased, the addition rate of L is gradually decreased, and the addition rate of M is always constant. The alkaline earth metal osmium carbonate composed of barium osmium carbonate and osmium carbonate and calcium osmium carbonate synthesized at the addition rate shown in FIG. 15 as osmium carbonate Η. A part of the crystals of the ytterbium carbonate was sampled and the same X-ray diffraction analysis was performed as described above. The diffraction pattern shown in Fig. 16 was shown. This paper size applies the Chinese National Standard (CNS) A4 specification (210 '乂 297 mm) 494441 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (β) As shown in Figure 16 at the diffraction angle Between 2 2 ° and 2 7 °, the erbium carbonate is different from the ternary erbium carbonate in the conventional case (Fig. 19). The diffraction pattern has three peaks. Then, 630 ppm by weight of oxidized IZ was added to thorium carbonate to form a mixture, which was used as a cathode ray tube emitter in the same way as above. The life test was performed at a current density of 3A / cm2. As a result of the current residual ratio, the results shown in FIG. 17 were obtained. The line in Fig. 17 shows the case where rhenium carbonate is used, and the line e shows the case where the second example is used. It can be seen from Fig. 17 that, for example, when thorium carbonate is used at an operating time of 2000 hours, the residual current ratio of the radiated current is increased to 3 times that of the conventional case 2. It is K. By using ytterbium carbonate as a cathode emitter material, it can fully meet the expectations of large-screen, high-brightness, and high-resolution of the cathode-ray tube. It can be seen from the effects of the above embodiments that the present invention disperses or separates at least one of the alkaline earth metal rhenium carbonate in a mixed crystal or solid solution of at least two alkaline earth metal rhenium carbonate. Under the operating conditions of high current density of 3A / cm2, an emitter material for a cathode ray tube with good radiation lifetime characteristics can still be obtained, and it is more effective if it contains a rare earth metal oxide. Examples shown in the first to fourth embodiments include yttrium oxide, but the same effect can be obtained with ytterbium oxide, air oxide, and the like. Furthermore, they contain rare earth metals, rare earth oxides, and rare earth metals Although any one of rhenium carbonate has a difference in degree, the same effect can be obtained. In addition, as a method of containing rare earth metals, there are (Please read the precautions on the back before filling out this page) Clothing _

、 1T L0 This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 494441 A7 B7 V. Description of the invention (丨 f) The method of K co-deposition reaction in the crystal of alkaline earth metal rhenium carbonate, K In this method, the same effect can be obtained when the rare earth metal is contained in the alkaline earth metal rhenium carbonate. In particular, yttrium is used as a rare earth element, and the atomic number of M relative to the alkaline earth metal is contained in a range of 550 to 950 p pm in the emitter material. The same effect as the above can be obtained, which is similar to the case where the thermal decomposition temperature is not included. It can reduce the temperature around 100 ° C, shorten the thermal decomposition time, and reduce the manufacturing cost. In the first to fourth embodiments described above, examples are shown in which an alkaline earth metal rhenium carbonate synthesized by a sodium carbonate precipitation method is used, and an alkaline earth metal rhenium carbonate using an ammonium carbonate precipitation method is also used to obtain the same effect. In addition, the X-ray diffraction pattern has two peaks on K in the plane interval of 0.33nm to 0.40nm, and a cathode having good radiation characteristics under a high current density operation of 3A / cm2 can be selected. The emitter material for a ray tube does not need to evaluate the radiation characteristics of the cathode for a cathode ray tube when manufacturing a cathode ray tube, which can reduce the manufacturing cost. [Effects of the invention] Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page) As explained above, according to the present invention, the emitter material for cathode ray tubes contains at least two alkaline earth metals Radioactive materials for cathode ray tubes of mixed crystals or solid solutions of ytterbium carbonate, by dispersing or separating at least one alkaline earth metal dysprosium carbonate in the above mixed crystals or solid solution, can be implemented even at more than 2A / cm2. Current density, that is, it can maintain sufficient life under the radiation of current density of 3A / cm2, and it is suitable for large paintings -2 ^ Paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 494441 A7 B7 V. Explanation of the invention (/) * Surface-emitting, high-brightness, high-resolution emitter material for cathode ray tubes 0 In addition, according to the method for producing an emitter material for cathode-ray tubes of the present invention, it is in an aqueous solution containing carbonate ions , At least two alkaline earth metal rhenium nitrate aqueous solutions are added and synthesized at different addition speeds, thereby making it possible to efficiently manufacture the upper cathode radiation. Emitter material for wire tube. [Simplified description of the drawing] Fig. 1 is a partial cross-sectional view of a cathode of a color cathode ray tube according to Embodiment 1 of the present invention. X-ray diffraction pattern diagram. Fig. 3 is an X-ray diffraction pattern diagram of the mixed rhenium carbonate B as the cathode material of the first embodiment. Fig. 4 is X of the mixed rhenium carbonate C as the cathode material of the first embodiment. Line diffraction pattern. Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page). Figure 5 is the cathode of the mixed rhenium carbonate A, B, and C using the above-mentioned spring example 1. Figure 1 shows the relationship between the radiation current residual ratio of the relative operating time of the cathode in the first example. Figure 6 is the relationship between P and radiation in the first embodiment of the invention. Figure 7 The relationship between R and radiation in the first embodiment. Fig. 8 is a characteristic diagram of the residual current ratio of the radiated current of the cathode of Example 2 of the present invention and the cathode of Conventional Example 2. The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 494441 A7 B7 V. Invention (&Gt; /) Fig. 9 is a graph showing the time change of the addition rate of the barium nitrate aqueous solution (K) and the europium nitrate aqueous solution (L) synthesized by the alkaline earth metal rhenium carbonate (rhenium carbonate E) according to Example 3 of the present invention. Fig. 1 0 is a graph of the time change of the addition rate of the barium nitrate aqueous solution (K) and the lutetium nitrate aqueous solution (L) synthesized by the alkaline earth metal rhenium carbonate (rhenium carbonate F) in Example 3 of the present invention. X-ray diffraction pattern diagram of thorium carbonate E as a cathode material. Fig. 12 is an X-ray diffraction pattern diagram of thorium carbonate F of the cathode material of the above embodiment 3. Fig. 13 is the use of the above-mentioned spring embodiment 3. Residual ratio of radiated current in the relative operating time of the cathodes of thorium carbonate E and F and the cathode of the conventional example 1 Figure 0 Figure 14 Residual radiated current relative to the operating time of the cathode of the third embodiment and the cathode of the conventional example 1 Compared to the characteristic diagram. Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). Figure 1 5 is an aqueous solution of barium nitrate (K ) And time diagrams of the addition rates of the rhenium nitrate aqueous solution (L) and the calcium nitrate aqueous solution (M). FIG. 16 is an X-ray diffraction diagram of thorium carbonate of the cathode material of Example 4 above. Fig. 17 is a characteristic diagram of the radiant current residual ratio of the relative operating time of the cathode using rhenium carbonate of the fourth embodiment and the cathode of the conventional example 2. Figure 1 Binary alkaline earth metal carbonic acid carbonate of the cathode material of the 8 series of use cases. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 &gt; &lt; 297 mm) 494441 A7 B7. 5. Description of the invention (&gt; &gt; The X-ray diffraction pattern of the 〇. Figure 19 X-ray diffraction pattern of the ternary alkaline earth metal rhenium carbonate of the cathode material of the 9th example. Figure 20 The residual ratio of the radiated current of the relative operation time of the cathode of the 0th example. [Characteristics] 1 Heating wire 2 Sleeve 3 Cover-like substrate 4 Emitter (Please read the precautions on the back before filling this page)

， 1T Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs This paper size applies to the Chinese National Standard (CNS) Α4 specification (210X 297 mm)

Claims (1)

494441 A8 B8 C8 D8 々, patent application scope 1 ♦ A cathode ray tube emitter material is a cathode ray tube emitter material containing at least two alkaline earth metal rhenium carbonate crystals or solid solution, which is characterized by · · At least one kind of alkaline earth metal rhenium carbonate is dispersed or separated in the mixed crystal or solid solution of the upper stream. 2 * The emitter material for cathode ray tubes according to item 1 of the scope of the patent application, wherein in the mixed crystal or solid solution, at least one kind of crystal particles of alkaline earth metal rhenium carbonate are dispersed, and the average particles of the crystalline particles on the upper side are dispersed. The diameter is relative to the average particle diameter of the above-mentioned mixed crystal or solid solution, which is within a range of 1/3 times K or less. 3 ♦ The cathode-ray tube emitter material according to item 1 of the scope of the patent application, wherein in the mixed crystal or solid solution, at least one kind of crystal particles of at least one alkaline earth metal rhenium carbonate are dispersed, and the average of the crystal particles is The particle size is in the range of 2 wm Μ and 5 wm K ϋ 4 ♦ The emitter material for cathode ray tubes according to item 1 of the patent application scope, wherein the alkaline earth metal rhenium carbonate is diffracted in X-ray pattern Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page) 0 ♦ 33nmK on the surface interval below 0 ♦ 'OnmK, there are two peaks on M. 5. The emitter material for cathode ray tubes according to item 1 of the scope of the patent application, wherein the at least two alkaline earth metal rhenium carbonate are composed of barium rhenium carbonate and europium rhenium carbonate. 6. The emitter material for cathode ray tubes according to item 5 of the scope of the patent application, in which the alkaline earth metal rhenium carbonate is made of barium rhenium carbonate and rhenium carbonate-paper. The Chinese paper standard (CNS) A4 specification (2) 〇χ297mm ^ 494441 A8 B8 C8 D8 VI. Patent application scope 塩 Two types of cathode ray tube emitter materials, alkaline earth metal rhenium carbonate is in the range of 0 ♦ 1% by weight to 70% by weight Dispersing or separating those who exist 7 ♦ The cathode material for cathode ray tubes according to item 1 of the scope of patent application, wherein the at least two alkaline earth metal rhenium carbonates are made of barium rhenium carbonate, rhenium rhenium carbonate, and calcium rhenium carbonate. 8 ♦ The emitter material for cathode ray tubes according to item 7 of the scope of patent application, wherein the alkaline earth metal rhenium carbonate is a cathode composed of three kinds of barium rhenium carbonate, rhenium rhenium carbonate, and calcium rhenium carbonate. Among the emitter materials for ray tubes, the alkaline earth metal rhenium carbonate is dispersed or separated within the range of 0 ♦ 1% by weight to 60% by weight κ. 9 ♦ 依The emitter material for a cathode ray tube as claimed in item 1 of the patent, wherein the emitter material for a cathode ray tube further contains at least one substance selected from the group consisting of a rare earth metal, a rare earth metal oxide, and a rare earth metal thorium carbonate. Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page) 1 0 * According to the patent application scope item 1 of the emitter material for cathode ray tubes, where κ co-deposition contains relative The number of atoms of the alkaline earth metal constituting the radioactive material, yttrium atom of 5 50 ~ 9 50 ppm. 1 1 · A method for producing a cathode material for a cathode ray tube, comprising a mixture of at least two alkaline earth metals rhenium carbonate A method for producing a crystal or solid solution of a cathode material for a cathode ray tube, which is characterized in that: in an aqueous solution containing carbonate ions, at least two kinds of alkaline earth metal osmium nitrate aqueous solution K are added at different speeds to synthesize.-1- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm). Printed by the agency 494441 A8 B8 C8 D8 VI. Application scope of patent 1 2 ♦ According to the method of manufacturing cathode material for cathode ray tubes described in item 11 of the scope of application for patent, which is in the mixed crystal or solid solution, Disperse at least one kind of crystal particles of alkaline earth metal rhenium carbonate, so that the average particle diameter of the above crystal particles is within a range of 1/3 times M to 3 times M relative to the average particle diameter of the mixed crystal or solid solution. 1 3 * According to the manufacturing method of the cathode material for a cathode ray tube according to item 11 of the scope of the patent application, wherein at least one kind of crystal particles of alkaline earth metal rhenium carbonate is dispersed in the above mixed crystal or solid solution, so that the The average particle size of the crystal particles is within a range of 2 iumK and 5 wmK. 1 4 ♦ The method for manufacturing an emitter material for a cathode ray tube according to item 11 of the scope of the patent application, wherein the alkaline-earth metal thorium carbonate is in a plane interval of 0 · 33nmK at 0 · 33nmK of the X-ray diffraction pattern. With two spikes on K. 1 5 * According to the method for manufacturing an emitter material for a cathode ray tube according to item 11 of the scope of the patent application, wherein the at least two alkaline earth metal europium carbonate are composed of barium europium carbonate and europium europium carbonate. 1 6 ♦ The manufacturing method of cathode material for cathode ray tubes according to item 15 of the scope of patent application, wherein the alkaline-earth metal thorium carbonate is made of barium thorium carbonate and thallium thorium carbonate. In the material, alkaline earth metal rhenium carbonate is dispersed or separated in a range of 0 * 1% by weight or more and 70% by weight or less. 17 · According to the manufacturing method of the cathode material for the cathode ray tube according to item 11 of the scope of the application for patent, wherein the at least two alkaline earth metal rhenium carbonate is used, the paper size applies to the Chinese National Standard (CNS) A4 specification (210 × 297 mm) ) ---------- ^-(Please read the precautions on the back before filling out this page), 1T f 494441 A8 B8 C8 D8 VI. The scope of patent application is made of barium osmium carbonate and ytterbium carbonate and Three kinds of calcium carbonate. 1 8 * According to the manufacturing method of the cathode material for the cathode ray tube according to item 17 of the scope of the patent application, wherein the alkaline earth metal thorium carbonate is a cathode ray composed of three kinds of barium thorium carbonate and thallium thorium carbonate and thallium thorium carbonate. Among the tube emitter materials, the alkaline earth metal rhenium carbonate is dispersed or separated from the range of 0 to 1% by weight and 60% by weight. 1 9 ♦ The method for manufacturing an emitter material for a cathode ray tube according to item 11 of the scope of patent application, wherein the emitter material for a cathode ray tube further contains a material selected from the group consisting of rare earth metals, rare earth metal oxides, and rare earth metals. At least one substance of europium carbonate. 2〇 ♦ According to the manufacturing method of the cathode material for the cathode ray tube according to item 19 of the scope of the patent application, co-deposition of yttrium atoms containing 550 to 95 ppm of atoms containing the number of atoms of the alkaline earth metal constituting the emitter material . 2 1 * —A method for forming a cathode for a cathode ray tube, which is printed on the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). After the mixed crystal or solid solution of at least two alkaline earth metal rhenium carbonate is covered and fixed, it is thermally decomposed in a vacuum to form the alkaline earth metal rhenium carbonate into alkaline earth metal rhenium oxide. 0 Paper size Applicable to China National Standard (CNS) A4 specification (210x297 mm)