Cathod structure for cathode ray tube
A cathode ray and structure technology, applied in the direction of cathode ray tube/electron beam tube, discharge tube solid thermionic cathode, discharge tube, etc., can solve the problem of inability to obtain sufficient electron emission, decrease and increase of electron emission time, and electron emission Problems such as large shrinkage of the material layer
Inactive Publication Date: 2002-01-23
PANASONIC CORP
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Problems solved by technology
[0008] However, in the above-mentioned conventional cathode structure, there is a problem that sufficient electron emission cannot be obtained in the initial activation process, and there is a problem that the reduction of electron emission increases with time during operation.
Furthermore, due to the advancement of the reduction reaction, the electron emission material layer shrinks too much during operation, and there is a problem that the variation of the cut-off voltage (electron beam erasing voltage) which is inversely proportional to the distance between the counter electrode and the electron emission material increases.
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[0037] Hereinafter, the present invention is described in more detail by examples, but the present invention is not limited to the following
[0038] Example.
[0039] Various changes are made to the size of the substrate (the upper surface is a circle), the area or thickness of the electron emission material layer (the same circle) sprayed on it, and the figure 1 The cathode of the morphology shown.
[0040] As the cathode, in order to confirm the relationship between the surface area A of the substrate and the area B of the electron emission material layer, three types of substrates with a diameter of 0.1, 0.2, and 0.3 [mm] of the layer formation surface were prepared to achieve a ratio B / A of 1.0, 0.88, 5 types of electron emission material layers formed like 0.62, 0.24, and 0.1. The thickness of the substrate is fixed at 100 [μm], and the thickness of the electron emission material layer is fixed at 65 [μm].
[0041] In addition, in order to confirm the relationship bet...
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A cathode including an electron-emitting layer formed on a substrate containing a reductive element satisfies an expression of 0.24<=B / A<=0.93, where A is the surface area of the substrate and B is the contact area between the substrate and the electron-emitting layer. In addition, 0.4<=D / C<=0.7 is satisfied, where C is the thickness of the substrate and D is the thickness of the electron-emitting layer. Such a cathode structure provides sufficient electron emission, and the variations in electron emission and cutoff voltage with time are small.
Description
technical field [0001] The present invention relates to a cathode structure disposed in an electron gun of a cathode ray tube used for televisions, computer monitors, and the like. Background technique [0002] Such as figure 2 As shown, a cathode ray tube 1 includes: a panel portion 3 having a fluorescent surface 2 on its inner surface; a funnel portion 4 joined behind the panel portion 3; and an electron gun 6 disposed on a neck portion 7 of the funnel portion 4 inside, emit electron beams 5 . [0003] At one end of the electron gun 106, a side-heated cathode structure 108 is provided. Such as Figure 8 As shown, in the cathode structure 108 , one end of the cylindrical sleeve 109 is covered with a cup-shaped base 110 , and an electron-emitting material layer 111 serving as an electron-emitting emitter for emitting electrons is formed on the surface of the base 110 . Furthermore, inside the cylindrical sleeve 109, an aluminum oxide insulating layer 113 and a coil-shape...
Claims
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IPC IPC(8): H01J1/20
CPCH01J1/20H01J2201/193H01J29/04
Inventor 山岸未果
Owner PANASONIC CORP