Impregnated cathode structure and method of manufacturing the structure
An impregnation type, cathode technology, applied in cold cathode manufacturing, thermionic cathode manufacturing, electrode system manufacturing, etc., can solve problems such as inability to achieve stable work, heater leakage current, and inability to emit thermal electrons
Inactive Publication Date: 2003-03-19
SONY CORP
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Problems solved by technology
[0017] If the porous metal base 1 with the metal foil 5 is fixed in the cap member 2 to be welded by laser in a state where there is an uneven portion on the surface of the metal foil 5, there will be an inclination of the porous metal base 1 with respect to the cap member 2 case, resulting in perforation of the cap element 2 due to laser irradiation
[0018] The perforation of the cap element 2 causes a problem of leakage current to the heater through this perforation in the case of using an electron gun comprising such an impregnated type cathode unit, so that stable operation cannot be achieved
[0019] In addition, if the porous metal base 1 is inclined with respect to the cap member 2, welding defects due to occurrence of non-welded portions are liable to occur, resulting in the possibility of separation of the porous metal base 1 from the cap member 2.
Even if the cap member 2 is welded to the porous metal base 1 in such an inclined state, the inclined porous metal base 1 may come into contact with the gate to be separated from the porous metal base 1 by a given distance (for example, 100 μm), and as a result, as a product The electron gun becomes defective so that it cannot emit thermionic electrons and cannot perform the function of the electron gun
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[0041] will refer to Figures 1 to 4 Preferred embodiments of the present invention are described.
[0042] figure 1 is a flowchart illustrating an impregnated cathode unit and a manufacturing method for the impregnated cathode unit according to a preferred embodiment of the present invention, figure 2 is an enlarged cross-sectional view showing the welded area between the porous metal substrate and the cap element constituting the impregnated type cathode unit, image 3 is a cross-sectional view showing the structure of the porous metal substrate, while Figure 4 is a sectional view showing the mechanism of the cap element.
[0043] Inside the neck of the color cathode ray tube, an electron gun is incorporated. The electron gun has the function of emitting electron beams. The electron gun consists of a cathode assembly and a plurality of grid electrodes. The cathode assembly consisted of three impregnated cathode units for R, G and B.
[0044] Each impregnated cathod...
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Abstract
An impregnated cathode structure and a method of manufacturing the structure capable of firmly connecting a porous base metal to a cup body without using an intervenient and increasing the reliability of welding between the porous base metal and the cup body and an yield by eliminating the occurrence of defective welding; the impregnated cathode structure, comprising the porous base metal (11) impregnated with emissive materials and the cup body (12) allowing the surface of the porous base metal (11) to expose and holding the porous base metal (11) so as to cover the bottom and side faces thereof, wherein a non-porous dense part (14) is formed at the bottom face of the porous base metal (11), a close-fitted area (16) is formed by pressingly deforming the bottom part of the cup body (12) along the shape of the dense part (14), and the bottom part of the cup body (12) is welded to the dense part (14) of the porous base metal (11) in the close-fitted area (16).
Description
technical field [0001] The present invention relates to an impregnated cathode unit having a porous metal substrate impregnated with an electron-emitting material, and also to a manufacturing method for the impregnated cathode unit, and in particular to a porous metal substrate and fixing the An impregnated type cathode unit in which the connection structure between cap members of a porous metal base is improved so as to cover its bottom and side surfaces, and also relates to a manufacturing method for the impregnated type cathode unit. Background technique [0002] The impregnated type cathode unit operates at a high current density and has a long life, so it is mainly used as the cathode of an electron gun for a traveling wave tube to be mounted on a satellite, etc., a cathode ray tube for a high-quality video system, or a camera tube . [0003] The impregnated cathode unit consists of a cathode sleeve element, a cap element 12 attached to the top of the cathode sleeve el...
Claims
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Login to View More IPC IPC(8): H01J1/28H01J9/04
CPCH01J1/28H01J9/047Y10T29/49002
Inventor 今林大智
Owner SONY CORP