WO2004001784A1 - カットオフ電圧の変動低減方法、電子管用カソード及び電子管用カソードの製造方法 - Google Patents
カットオフ電圧の変動低減方法、電子管用カソード及び電子管用カソードの製造方法 Download PDFInfo
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- WO2004001784A1 WO2004001784A1 PCT/JP2002/006127 JP0206127W WO2004001784A1 WO 2004001784 A1 WO2004001784 A1 WO 2004001784A1 JP 0206127 W JP0206127 W JP 0206127W WO 2004001784 A1 WO2004001784 A1 WO 2004001784A1
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- front surface
- electron tube
- cathode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/26—Supports for the emissive material
Definitions
- the present invention relates to an improvement in a cathode for an electron tube used for a cathode ray tube.
- FIG. 8 is a schematic diagram of a general cathode ray tube.
- a cathode ray tube 100 of a television receiver or the like includes a G1 electrode g, a fixed distance D behind the G1 electrode g, and a force for an electron tube disposed behind the G1 electrode g in the cathode ray tube body 101.
- the main configuration is provided with a sword 103.
- the electron tube power source 103 and the G1 electrode g constitute an electron gun. Normally, for the current drawn from the cathode for cathode ray tube 103, the voltage applied to the G1 electrode g should be fixed, and the applied voltage to the cathode for cathode ray tube 103 should be varied from 0 to the cut-off voltage. Is controlled by The cut-off voltage is a fixed value determined according to the distance D between the front surface 113 a of the electron tube power source 103 and the G1 electrode g.
- these electron tube power swords 103 are provided at the end of the heat storage tube 107 accommodated in the sleep 105 and one end of the sleeve 105, and are mainly provided with nickel.
- An electron emitting material layer 113 mainly containing an oxide and containing a rare earth metal oxide such as scandium oxide.
- the main parts 1 1 1 and 1 1 3 of this electron tube power source 103 are manufactured by the following procedure.
- tungsten for example, was deposited in a film shape on the front surface 109 a of the cathode substrate 109 provided in the semi-finished electron tube power source 103, and was deposited. Is heated in a hydrogen atmosphere to fuse it to the force sword substrate 109. As a result, a metal layer 111 made of tungsten is formed.
- a suspension composed of carbonates of alkaline earth metals such as barium and rare earth metal oxides is applied to the front surface 11a of the metal layer 111, and the applied suspension is heated. Then, the alkaline earth metal carbonate in the suspension is changed to an alkaline earth metal oxide.
- the alkaline earth metal oxide is heated to partially reduce the alkaline earth metal oxide, thereby converting the alkaline earth metal oxide into an oxygen-deficient semiconductor that easily emits thermoelectrons. Thereby, the electron emitting material layer 113 is not formed. In this manner, the main parts 111 and 113 of the electron tube casing 103 are manufactured.
- a part of the alkaline earth metal oxide is reduced to the reducing element (magnesium (Mg), silicon (Si)) or the metal layer 111 included in the power source substrate 109. It is reduced to free alkaline earth metal by the contained tungsten (W).
- W tungsten
- part of barium oxide (BaO) is reduced to free barium (Ba) by the reaction of equations (1), (2) and (3).
- the free alkaline earth metal such as free barium serves as a thermionic emission source.
- the electron emission material layer 113 is heated by the heat source 107 for indirect heat, and thermionic electrons are emitted from the front surface 113 a of the electron emission material layer 113. (Emission), and these thermoelectrons are taken out and supplied to the current.
- the amount of free alkaline earth metal that becomes a thermionic emission source due to the formation of the metal layer 111 composed of a reducing element between the cathode substrate 109 and the electron emitting material layer 113 Thereby increasing the current drawn from the electron tube power source 103.
- This electron tube power source comprises a power source substrate and an alkaline earth metal oxide containing barium oxide formed on the front surface of the power source substrate, and the barium oxide content is higher than that of the front side.
- the electron emission material layer is configured to be lower on the side in contact with the electron emission material, and an indirect heating layer that heats the electron emission material layer.
- the current taken out from the electron tube power source is increased by lowering the content of the oxide barium contained in the electron emitting material on the contact surface side with the cathode substrate than on the front surface side.
- the cause of this problem is that as the extraction current becomes larger, the front surface of the electron emitting material layer 113 becomes more worn (evaporated), and the front surface of the electron emitting material layer 113 becomes more pronounced.
- the distance D between a and the G1 electrode g increases (this is as known from the Illuminating Engineering Institute study material (MD-95-12)).
- the following two mechanisms are considered as the mechanism of exhaustion of the electron emitting material layer 113.
- the present invention solves the above-mentioned problems, and provides a method for reducing a change in cutoff voltage that can reduce a change in cutoff voltage during operation of a cathode ray tube, a method for manufacturing a power source for an electron tube, and a method for a cathode for an electron tube. Aim.
- the present inventor believes that the cause of the fluctuation of the cutoff voltage is that the distance D between the front surface of the electron emitting material layer and the G1 electrode g increases due to the exhaustion and receding of the front surface of the electron emitting material layer. I found something and thought of the present invention.
- a metal layer is formed on the surface of the cathode substrate by heating the surface of the cathode substrate so as to protrude and deform the force source substrate.
- an electron emitting material layer is formed directly on the front surface of the cathode substrate or via the metal layer, and thermionic electrons are emitted from the front surface of the electron emitting material layer by heating the electron emitting material layer.
- the front surface of the electron emitting material layer is depleted and receded by the forward deformation of the cathode substrate due to the metal layer induced by heating by the heating means. Projecting forward, the front surface of the electron-emitting material layer can be maintained at a substantially constant position even when the front surface of the electron-emitting material layer is consumed, and the fluctuation of the cut-off voltage during the operation of the brown tube is reduced. Can be reduced.
- the metal layer is formed on a front surface of the cathodic base, and is alloyed with metal contained in the cathodic base and expanded by heating by the heating means.
- the front surface of the force sword base is projected and deformed.
- the cathodic base is caused to protrude forward by utilizing the expansion accompanying the alloying of the metal layer and the force sword base. Therefore, the force sword base can be protruded forward by a simple method.
- the metal layer is formed on irregularities formed on a surface of the cathode substrate.
- the contact area between the force sword base and the metal layer is increased by the unevenness formed on the front surface of the force sword base, so that a small amount of forming area (plan view area) and a sufficient amount of Projecting deformation of the substrate.
- the metal layer is divided into a plurality of pieces and dispersed and formed on the surface of the force source base.
- the metal layer is divided into a plurality of pieces and dispersed and formed on the surface of the cathode base, the projecting deformation of the cathode base caused by expansion caused by alloying of the metal layer and the force base is performed. Optimization becomes easier.
- a power source substrate and a metal layer formed on the surface of the cathode substrate and projecting the cathode substrate forward by heating are deformed.
- An electron emitting material layer formed directly on the front surface of the cathode substrate or via the metal layer; and heating for heating the electron emitting material layer to emit thermoelectrons from the front surface of the electron emitting material layer.
- the front surface of the electron emitting material layer is depleted and receded by the forward deformation of the cathode substrate due to the metal layer induced by heating by the heating means. Projecting forward, the front surface of the electron-emitting material layer can be maintained at a substantially constant position even when the front surface of the electron-emitting material layer is consumed, and the fluctuation of the cut-off voltage during the operation of the brown tube is reduced. Can be reduced.
- the metal layer is The force source is formed on the front surface of the base, and is alloyed with the metal contained in the force sword base by the heat and heat generated by the heating means and expands, thereby projecting and deforming the front surface of the force sword base.
- the force sword base is caused to protrude forward by utilizing the expansion accompanying the alloying of the metal layer and the cathodic base, so that the force sword base can be protruded forward by a simple method.
- the metal layer is formed on irregularities formed on a surface of the cathode base.
- the contact area between the cathode base and the metal layer is increased by the unevenness formed on the front surface of the cathode base, so that a small formation area (area in plan view) and a sufficient amount The force sword substrate can be protruded.
- the metal layer is divided into a plurality of pieces and dispersed to be formed on the surface of the force saw base. According to this aspect, since the metal layer is divided into a plurality of parts and dispersed and formed on the surface of the cathode base, the projecting deformation of the force source base due to expansion caused by alloying of the metal layer and the force base. This makes it easier to perform the optimal dagger.
- a metal layer for projecting and deforming the cathode base forward by heating the surface of the power source base (B) a step of forming an electron emitting material layer directly on the front surface of the force source substrate or through the metal layer; and (c) heating the electron emitting material layer to emit the electron.
- the metal layer induced by heating by the heating means projects forward of the cathode base.
- the metal layer is formed such that the front surface of the electron-emitting material layer protrudes forward and deforms to the extent that the front surface of the electron-emitting material layer is worn and receded by the deformation.
- the front surface of the electron emitting material layer is consumed and recedes by the forward deformation of the cathode substrate due to the metal layer induced by heating by the heating means, so that the front surface of the electron emitting material layer is reduced. Since the metal layer is formed so as to protrude and deform the electron emission material layer, even if the front surface of the electron emission material layer is consumed, the position of the front surface of the electron emission material layer is almost changed. It is possible to manufacture a cathode for an electron tube that can be maintained at a constant level and can reduce the fluctuation of the cut-off voltage during the operation of the cathode ray tube.
- the front surface of the power source base is alloyed with a metal contained in the cathode base by heating by the heating means.
- the metal layer is formed of a metal that protrudes and deforms the front surface of the force sword base by expanding.
- a metal layer is formed on the front surface of the kaleid substrate by a metal that is alloyed with the metal contained in the force source substrate by heating by the heating means and expands to protrude and deform the front surface of the cathode substrate.
- step (a) irregularities are formed on a surface of the force sword base, and the metal layer is formed on the irregularities.
- the contact area between the cathode substrate and the metal layer is increased, and a small formation area (plan view area) ) Can produce a sufficient amount of force sword for an electron tube capable of causing a sufficient amount of force sword substrate to protrude.
- the metal layer is divided into a plurality of pieces and dispersed and formed on the surface of the power source base.
- the metal layer is divided into a plurality of parts and dispersed and formed on the surface of the cathode base, the projection of the cathode base due to expansion accompanying the alloying of the metal layer and the force base is performed. It is possible to manufacture an electron tube casing that can easily perform deformation.
- FIG. 1 is a view showing a configuration of a main part and a G1 electrode of an electron tube cathode according to an embodiment of the present invention before projecting deformation. '
- FIG. 2 is a view showing a main part of the electron tube force sword according to the embodiment of the present invention after the projecting deformation.
- FIG. 3 is a diagram showing a configuration and a G1 electrode.
- FIG. 3 is a diagram showing the relationship between the amount of decrease in the thickness P of the electron emitting material layer and the amount of deformation Q protruding forward of the cathode substrate.
- FIG. 4 shows a comparison between a test result of a temporal variation of a current taken out of a cathode for an electron tube according to the embodiment of the present invention and a test result of a temporal variation of a taken-out current of a power source for an electron tube according to a comparative example.
- FIG. 5 shows a test result of the temporal variation of the cut-off voltage when the electron tube casing according to the embodiment of the present invention is used, and the temporal variation of the cut-off voltage when the electron tube force source according to the comparative example is used.
- FIG. 6 is a diagram showing a comparison with the test result of FIG.
- FIG. 6 is an actual cross-sectional view of the force sword base of the electron tube force sword according to the embodiment after the test of FIG.
- FIG. 7 is an actual sectional view of a cathode base of the cathode for an electron tube according to the comparative example after the test of FIG.
- FIG. 8 is a schematic diagram of a general cathode ray tube.
- FIG. 9 is a diagram showing an example of a schematic configuration of a conventional electron tube force sword.
- Fluctuations in the cut-off voltage of the electron tube power source cause luminance changes and color shifts in CRTs, for example. This is a phenomenon that occurs because the drive curve is shifted due to the change in the cutoff voltage and the extraction current is changed, and as a result, the current ratio between the RGB electron guns is lost and the brightness and white balance are lost. .
- the present invention provides a technique for suppressing the fluctuation of the cut-off voltage by suppressing the fluctuation of the distance between the electron tube power source and the G1 electrode, which is the most important cause of this phenomenon.
- the present invention provides an electron tube power source G1 electrode that is generated when the front surface (electron emission surface) of the electron emitting material layer constituting the electron tube power source is consumed (evaporates) and recedes during its life.
- an electron tube force sword 1 is provided at, for example, a cylindrical sleeve 3, an indirect heat sink 5 accommodated in the sleeve 3, and one end opening of the sleeve 3.
- the force sword base 7 is formed, for example, in a flat plate shape, and its front surface 7a is formed with appropriately large irregularities (not shown).
- the force sword substrate 7 has nickel as a main component, for example, and contains one or more reducing elements such as silicon-magnesium as a reducing agent.
- the metal layer 9 is composed of: (1) a metal having a property of expanding when alloyed with at least a metal (here, nickel) contained in the force source substrate 7 and (2) a metal having a reducing property.
- a metal that satisfies these conditions (1) for example, one or more of the following metals are used: tungsten, molybdenum, chromium, zirconium, conoreto, and aluminum.
- the metal layer 9 is divided into a plurality of pieces so as to have an appropriately formed area (area in plan view) on the unevenness formed on the front surface 7 a of the force source base 7, for example, divided into a plurality of pieces and dispersed. It is formed into a film having an appropriate thickness.
- the metal layer 9 is alloyed with the force sword base 7 by heating by the indirect heating heater 5 during operation of the plan tube, and the metal
- the cathode substrate 7 expands appropriately in the surface direction of the substrate 7, and causes the cathode substrate 7 to protrude forward (protrude in a convex shape) by this expansion, and the front surface 11 a of the electron emitting material layer 11 is consumed (evaporation).
- the front surface 11 a of the electron-emitting material layer 11 is deformed to protrude forward (protrude outward).
- the amount of retreat due to the consumption of the front surface 1 la of the electron emitting material layer 11, that is, the amount of reduction in the thickness P of the electron emitting material layer 11 is determined by the amount of forward deformation Q (i.e., It compensates for the amount of deformation Q) protruding forward of the front surface 11a of the material layer 11.
- the electron-emitting material layer 11 mainly contains an alkaline earth metal oxide containing at least barium oxide, and preferably contains 0.01 to 25% by weight of a rare earth metal oxide such as scandium oxide. I have.
- the electron tube force sword 1 is, as shown in FIG. It is located and disposed at a fixed distance D behind G 1 electrode g within 0 0.
- the distance D is the distance between the rear surface ga of the G1 electrode g and the front surface 11a of the electron emitting material layer 11.
- a semi-finished electron tube force sword 1 provided with a force sword substrate 7 containing, for example, nickel as a main component and, for example, magnesium as a reducing agent is prepared.
- irregularities are formed on the front surface 7a of the force source base 7 by, for example, a sand blast method.
- the sand plast method is a method of forming fine irregularities on the surface of a member by mixing an abrasive with air or water and spraying the mixture onto the member.
- various materials can be used.
- the main component of the cathode substrate 7 is nickel, which is a soft material, for example, calcium carbonate having relatively low hardness is used. '
- an air pressure of 0.05 to 0.1 Mpa is mixed with an abrasive such as calcium carbonate having a particle size of 600, for example, and is sprayed for 5 to 10 minutes only on the front surface 7a of the force source substrate 7.
- an abrasive such as calcium carbonate having a particle size of 600, for example, and is sprayed for 5 to 10 minutes only on the front surface 7a of the force source substrate 7.
- irregularities having an irregularity of ⁇ 10 to 20 / m the maximum height (Ry) specified in JISB 0601 is 20 jum
- a metal layer 9 made of, for example, tungsten is formed on the irregularities formed on the front surface 7a of the force source base 7.
- tungsten is vapor-deposited on the unevenness formed on the front surface 7a of the cathode substrate 7 by, for example, a sputtering method into a film having a thickness of, for example, 1 m.
- tungsten is divided into a plurality of pieces so as to have a vapor deposition area of an appropriate size and dispersed and vapor-deposited.
- tungsten is fused to the force sword substrate 7 by, for example, performing a heat treatment at 800 to 100 ° C. in a hydrogen atmosphere. Thereby, a metal layer 9 made of, for example, tungsten is formed.o
- the cathode base 7 protrudes forward due to the expansion caused by the alloying of the metal layer 9 and the force sword base 7 induced by the heating of the indirect heat source 5 during the operation of the brown tube.
- the amount of deformation Q i.e., the amount of forward deformation 1 Q in front of 1 la of the front surface of the electron-emitting material layer 11
- the thickness P of 1 should be almost the same as the reduction amount.
- This adjustment depends on the type (property) of the metal used for the metal layer 9, the thickness of the metal layer 9, and the size of the irregularities formed on the front surface 7 a of the force source substrate 7, and the front of the cathode substrate 7 is adjusted. Since the amount of protrusion deformation changes, it cannot be specified by the area ratio, etc., and is determined by trial and error through experiments.
- the metal layer 9 and the force sword base 7 are not completely alloyed by the heat treatment. This is because, in the present invention, it is necessary to alloy the metal layer 9 and the force sword substrate 7 by heating with the indirect heating heater 5 during the operation of the cathode ray tube.
- an electron emitting material layer 11 is formed on the front surface 7 a of the force sword substrate 7 via the metal layer 9. That is, first, a suspension is prepared by mixing, for example, a ternary carbonate of alkaline earth metal such as barium, strontium, and calcium, for example, 3% by weight of scandium oxide, a binder, and a solvent. Then, the prepared suspension is applied to the front surface 7a of the force sword substrate 7 via the metal layer 9 to a thickness of about 80 zm by, for example, a spray method.
- a suspension is prepared by mixing, for example, a ternary carbonate of alkaline earth metal such as barium, strontium, and calcium, for example, 3% by weight of scandium oxide, a binder, and a solvent.
- the semi-finished electron tube cathode 1 of this production stage is incorporated into the electron gun of the Braun tube, and during the evacuation process of the cathode ray tube production process, the indirect heat sink provided in the semi-finished electron tube cathode 1 is provided.
- the suspension applied to the front surface 7a of the cathode substrate 7 is heated by overnight. This converts the alkaline earth metal carbonate in the applied suspension into alkaline earth metal oxides, and some of them are reduced to free alkaline earth as a thermionic emission source.
- the alkaline earth metal carbonate in the suspension changes to an oxygen-deficient semiconductor that can easily emit thermionic electrons. Thereby, the electron emitting material layer 11 is formed.
- the rare earth metal oxide is contained in the electron emitting material layer 11, and (B) the cathode substrate 7 and the electron emitting material layer 11 A metal layer 9 made of a reducing element is interposed therebetween, and (C) irregularities are formed on the front surface 7 a of the force source substrate 7, and the electron emitting material layer 11 is formed on the irregularities via the metal layer 9. Therefore, a large extraction current of A AZ cm 2 can be obtained on average.
- a by-product called a so-called intermediate layer is formed in the process of forming the electron emitting material layer 11 by the rare earth metal generated by reduction of the rare earth metal oxide contained by the technique (A). Is decomposed, so that free alkaline earth metal as a source of thermionic electrons can be generated smoothly, thereby reducing the attenuation of the extraction current.
- the technology of (B) promotes the reduction reaction from the rare earth metal oxide to the rare earth metal based on the technology of (A), so that the attenuation of the extraction current can be further reduced, and furthermore, the electron emitting material Since the reduction reaction that occurs during the formation process of the layer 11 is promoted, the generation of free alkaline earth metal, which is a source of thermionic electrons, can be promoted, and the extraction current can be increased.
- the technique (C) can improve the adhesion between the cathode substrate 7, the metal layer 9 and the electron emitting material layer 11 and increase the contact area between the cathode substrate 7, the metal layer 9, and the electron emitting material layer 11. Since the reduction reaction that occurs during the formation process of GaN is further promoted, the amount of free alkaline earth metal that can be a source of thermionic electrons can be further increased, and the extraction current can be further increased. Since the reduction reaction from the rare earth metal oxide to the rare earth metal by the technology is further promoted, the attenuation of the extraction current can be further reduced.
- the extraction current is about 0.5 AZcm 2 .
- the extraction current is about 2.OA / cm 2 .
- Ri out current 3.
- OA / cm 2 or so the further the in those subjected to techniques (C) (electron tubes for power Sword 1 according to this embodiment) 4.
- OA / cm 2 approximately. From this result, it is understood that the extraction current can be further increased by the technique (C) as described above.
- Fig. 4 shows a comparison between the test results of the time variation of the maximum extraction current of the electron tube power source 1 according to the present embodiment and the test results of the time variation of the maximum extraction current of the electron tube power source according to the comparative example.
- FIG. The vertical axis in the figure indicates the relative value (the initial value of the maximum current of the cathode) when the initial value of the maximum current is 100.
- the electron tube force sword according to this comparative example has the same configuration as the electron tube force sword 1 according to the present embodiment except that the above-mentioned technique (C) is not applied. From the results shown in FIG.
- the electron tube force sword 1 according to the present embodiment has a further reduced extraction current attenuation as compared with the electron tube force sword according to the comparative example. From this result, it is understood that the technique (C) can further reduce the attenuation of the extraction current as described above.
- the metal layer 9 is alloyed with the cathode base 7 by heating by the indirect heating 5 during the operation of the CRT.
- the cathode substrate 7 expands appropriately in the surface direction of the cathode substrate 7, and the expansion causes the cathode substrate 7 to protrude and deform forward, so that the front surface 11 a of the electron-emitting material layer 11 is worn and receded.
- the metal layer 9 is formed so that the front surface 1 la of the electron emitting material layer 1 1 protrudes and deforms forward, even if the front surface 1 la of the electron emitting material layer 1 1 is consumed, the electron emitting material layer 1
- the front surface of 1 1 can keep the position of 1 a almost constant, that is, the fluctuation of the distance D between the front surface 1 1 a of the electron emitting material layer 1 and the G 1 electrode g can be reduced, and the CRT is operating. Can reduce the fluctuation of the cutoff voltage. This effect is concluded from the test results shown in Figs.
- the cathode base 7 is projected forward by using the expansion accompanying the alloying of the metal layer 9 and the force base 7, so that the cathode base 7 can be projected forward by a simple method. .
- the metal layer 9 is formed by being divided into a plurality of pieces with an appropriately formed area and dispersed and formed, a cathodic group due to expansion due to alloying of the metal layer 9 and the force source base 7 is formed. Optimization of the projecting deformation of the body 7 is facilitated.
- the contact area between the force sword base 7 and the metal layer 9 is increased by the unevenness formed on the front surface 7a of the force sword base 7, a sufficient amount of the casodic base 7 can be obtained with a small formation area (plan view area). Can cause protrusion deformation.
- FIG. 5 shows the test results of the time variation of the cut-off voltage when the electron tube cathode 1 according to the embodiment of the present invention is used, and the cut-off voltage when the electron tube power cathode according to the comparative example is used. It is the figure which showed the comparison with the test result of a temporal variation.
- the vertical axis in the figure indicates a relative value (initial ratio of the cut-off voltage) when the initial value of the cut-off voltage is 100.
- the extraction current is 4 AZ cm 2 in both cases.
- the cathode for an electron tube according to this comparative example has the same configuration as that of the cathode for an electron tube 1 according to the present embodiment except that the technique (D) is not applied. . From the results of FIG. 5, it can be seen that the fluctuation of the cut-off voltage during the operation of the CRT is reduced in the power tube 1 for the electron tube according to the present embodiment, as compared with the power tube for the electron tube according to the comparative example.
- FIG. 6 is an actual sectional view of the force sword substrate 7 of the force sword 1 for an electron tube according to the present embodiment after the test of FIG. 5 (that is, after operating the cathode ray tube for 1000 hours).
- FIG. 7 is an actual sectional view of the cathode base 7 of the cathode for an electron tube according to the comparative example after the test of FIG. 5 (that is, after operating the cathode ray tube for 1000 hours). Both figures show photographs taken by embedding and polishing the cross section of the force sword substrate in epoxy resin. From FIG.
- the force sword substrate 7 of the force sword 1 for an electron tube according to the present embodiment shows that the front surface 1 la of the electron emission material layer 11 is consumed (evaporated) and retreated (approximately 20 zm). It was recognized that it was protruding forward (upward in the figure). On the other hand, from FIG. 7, it can be seen that the cathode base of the electron tube power source according to the comparative example hardly protrudes and deforms forward (ie, is flat).
- the electron tube power source according to the comparative example shows that even if the front surface of the electron emission material layer is consumed (evaporated) during the operation of the brown tube and recedes, the electron emission material layer is not damaged.
- the front surface of the electron emitting material layer and the G 1 electrode g increase because the front surface of the electron emission material layer hardly deforms forward, thereby increasing the cutoff voltage.
- the utility sword 1 uses the above technology (D) 'Because the front surface 11a of the electron-emitting material layer 11 is consumed (evaporated) and recedes during the operation of the tube, the electron emission surface is deformed because the front surface 11a of the electron-emitting material layer 1 1 projects forward.
- the sandplast method is employed as a method for forming irregularities on the front surface 7a of the force sword substrate 7, but the present invention is not limited to the sandplast method.
- a press die used for punching the force sword base 7 By forming the uneven surface in advance, it is also possible to form the unevenness on the front surface 7 a of the force source base 7.
- calcium carbonate was used as the abrasive used in the sandblasting method.
- the contact area between the force source substrate 7 and the electron emitting material layer 11 was increased, and the formation area of the metal layer 9 was increased.
- Any material may be used as long as it is suitable for the purpose of optimizing the quality, and for example, various materials such as glass beads may be used.
- Japanese Patent Application Laid-Open No. 9-190761 discloses a technique for reducing a change in cut-off voltage by dividing a metal layer into a plurality of pieces and dispersing the metal layer on a front surface of a cathode substrate. That is, there is disclosed a technique for keeping the distance D between the front surface of the force sword base and the G1 electrode constant.
- the gazette and the present invention are common.
- the cathode substrate 7 protrudes forward due to expansion due to alloying of the metal layer 9 and the cathode substrate 7, and the front surface 1 la of the electron emitting material layer 11 is consumed and recedes.
- the metal layer 9 is formed such that the front surface 11a of the electron-emitting material layer 11 protrudes and deforms forward. Suppress deformation of the cathode base due to expansion due to alloying with the sword base In that a metal layer is formed as described above.
- the withdrawal current (for example, 4) is large enough that the front surface 7a of the force sword substrate 7 wears (evaporates) remarkably and the front surface 7a of the force sword substrate 7 recedes due to the wear.
- a / cm 2 is a technique for reducing the fluctuation of the cutoff voltage that occurs when dealing with electrons / electrons
- a reducing metal layer is formed between a force source substrate and an electron emitting material layer
- the cut-off voltage of the cut-off voltage that occurs when dealing with an extraction current for example, 2 AZ cm 2
- the technique of the above-mentioned publication cannot reduce the fluctuation of the cut-off voltage which occurs when the take-out current is large as in the present invention.
- the front surface 11a of the electron-emitting material layer 11 protrudes forward because the front surface 11a of the electron-emitting material layer 11 is worn away and retreats. Therefore, the variation of the cut-off voltage increases as in the comparative example of FIG. From the above, it can be seen that the above publication is technically different from the present invention, and that the effects of the present invention cannot be obtained from the above publication.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN02829122.0A CN1628363A (zh) | 2002-06-19 | 2002-06-19 | 截止电压的变动降低方法、电子管用阴极以及电子管用阴极的制造方法 |
US10/512,082 US20050231093A1 (en) | 2002-06-19 | 2002-06-19 | Method of reducing fluctuation in cut-off voltage, cathode for electron tube, and method for manufacturing cathode for electronic tube |
PCT/JP2002/006127 WO2004001784A1 (ja) | 2002-06-19 | 2002-06-19 | カットオフ電圧の変動低減方法、電子管用カソード及び電子管用カソードの製造方法 |
JP2004515435A JPWO2004001784A1 (ja) | 2002-06-19 | 2002-06-19 | カットオフ電圧の変動低減方法および電子管用カソード |
Applications Claiming Priority (1)
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PCT/JP2002/006127 WO2004001784A1 (ja) | 2002-06-19 | 2002-06-19 | カットオフ電圧の変動低減方法、電子管用カソード及び電子管用カソードの製造方法 |
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PCT/JP2002/006127 WO2004001784A1 (ja) | 2002-06-19 | 2002-06-19 | カットオフ電圧の変動低減方法、電子管用カソード及び電子管用カソードの製造方法 |
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US (1) | US20050231093A1 (ja) |
JP (1) | JPWO2004001784A1 (ja) |
CN (1) | CN1628363A (ja) |
WO (1) | WO2004001784A1 (ja) |
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CN114429892A (zh) * | 2020-10-29 | 2022-05-03 | 中国科学院微电子研究所 | 热电子发射阴极及其组成的热电子和离子发射装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58189940A (ja) * | 1982-04-30 | 1983-11-05 | Hitachi Ltd | 熱電子放出陰極 |
JPS614133A (ja) * | 1984-06-18 | 1986-01-10 | Toshiba Corp | 陰極構体の製造方法 |
JPH09190761A (ja) * | 1996-01-09 | 1997-07-22 | Mitsubishi Electric Corp | 電子管用陰極 |
JP2000040461A (ja) * | 1998-07-24 | 2000-02-08 | Mitsubishi Electric Corp | 電子管用陰極 |
JP2000251613A (ja) * | 1999-02-24 | 2000-09-14 | Mitsubishi Electric Corp | 電子管用陰極 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4273683A (en) * | 1977-12-16 | 1981-06-16 | Hitachi, Ltd. | Oxide cathode and process for production thereof |
US4459322A (en) * | 1981-12-28 | 1984-07-10 | North American Philips Consumer Electronics Corp. | Method for producing cathode structure for cathode ray tubes utilizing urea-containing slurry |
JP2758244B2 (ja) * | 1990-03-07 | 1998-05-28 | 三菱電機株式会社 | 電子管用陰極 |
KR930008611B1 (ko) * | 1991-06-13 | 1993-09-10 | 삼성전관 주식회사 | 함침형 음극구조체와 그 제조방법 |
TW375753B (en) * | 1995-12-27 | 1999-12-01 | Mitsubishi Electric Corp | Electron tube cathode |
TW419688B (en) * | 1998-05-14 | 2001-01-21 | Mitsubishi Electric Corp | Cathod ray tube provided with an oxide cathod and process for making the same |
JP2002298755A (ja) * | 2001-01-26 | 2002-10-11 | Sony Corp | 電子銃と陰極線管及び画像表示装置 |
FR2839197A1 (fr) * | 2002-04-25 | 2003-10-31 | Thomson Licensing Sa | Cathode a oxyde pour canon a electrons a zone emissive plus dense et moins epaisse |
-
2002
- 2002-06-19 CN CN02829122.0A patent/CN1628363A/zh active Pending
- 2002-06-19 JP JP2004515435A patent/JPWO2004001784A1/ja active Pending
- 2002-06-19 US US10/512,082 patent/US20050231093A1/en not_active Abandoned
- 2002-06-19 WO PCT/JP2002/006127 patent/WO2004001784A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58189940A (ja) * | 1982-04-30 | 1983-11-05 | Hitachi Ltd | 熱電子放出陰極 |
JPS614133A (ja) * | 1984-06-18 | 1986-01-10 | Toshiba Corp | 陰極構体の製造方法 |
JPH09190761A (ja) * | 1996-01-09 | 1997-07-22 | Mitsubishi Electric Corp | 電子管用陰極 |
JP2000040461A (ja) * | 1998-07-24 | 2000-02-08 | Mitsubishi Electric Corp | 電子管用陰極 |
JP2000251613A (ja) * | 1999-02-24 | 2000-09-14 | Mitsubishi Electric Corp | 電子管用陰極 |
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JPWO2004001784A1 (ja) | 2005-10-27 |
CN1628363A (zh) | 2005-06-15 |
US20050231093A1 (en) | 2005-10-20 |
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