Cathode-ray tube having oxide cathode and method for producing same

An oxide cathode, cathode ray tube technology, applied in cathode ray tube/electron beam tube, cold cathode manufacturing, thermionic cathode manufacturing, etc., can solve problems such as low electron emission

Inactive Publication Date: 2000-10-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if Figure 14 As shown, this method cannot form proper voids in the electron emitting material layer, and there is a problem that the amount of electron emission is small compared with the manufacturing method using the spraying method.

Method used

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  • Cathode-ray tube having oxide cathode and method for producing same
  • Cathode-ray tube having oxide cathode and method for producing same
  • Cathode-ray tube having oxide cathode and method for producing same

Examples

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Embodiment 1

[0045] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is an enlarged cross-sectional view of the oxide cathode part of the cathode ray tube of Embodiment 1 of the present invention, 1 is a disc-shaped metal substrate, 2 is a sleeve supporting the metal substrate, and 3 is coated on the metal substrate 1 The electron-emitting material layer mainly composed of alkaline earth oxide particles, 4 is an incandescent wire for heating the electron-emitting material layer, and the oxide cathode is set in a cathode ray tube (not shown in the figure) that maintains vacuum . The particles of the alkaline earth metal oxide forming the electron emissive material layer are composed of needle-like first-type particles 5 and approximately spherical second-type particles 6 . The first type of particles is more than the second type of particles, the average length L of the first type of particles is longer than that of the second...

Embodiment 2

[0069] Hereinafter, another embodiment of the present invention will be described with reference to the drawings. Figure 6 It is an enlarged cross-sectional view of a part of an oxide cathode of a cathode ray tube according to Example 2 of the present invention, Figure 7 is for manufacturing Figure 6 The cathode ray tube shown is a cross-sectional view of the same position after applying printing paste to be an electron emissive material layer by screen printing and drying it. Such as Figure 7 As shown, layer 3 serving as the electron emissive material layer is mainly composed of carbonate particles 5 which are alkaline earth metals, and porous material particles 7 . After making a cathode ray tube, such as Figure 6 As shown, the porous material particle 7 decomposes and evaporates without remaining, but the position where the porous material particle is located becomes a void. That is, suitable voids, especially pores, are formed on the surface. Therefore, it is pos...

Embodiment 3

[0083] Figure 8 It is an enlarged cross-sectional view of a part of the oxide cathode of the cathode ray tube according to Example 3 of the present invention, Figure 9 is for manufacturing Figure 8 The cathode ray tube shown is a cross-sectional view of the same position after the printing paste used as the electron emissive material layer is applied by the screen printing method and dried. Such as Figure 9 As shown, the layer 3 serving as the electron emissive material layer is mainly composed of carbonate particles 5 and 6 which are alkaline earth metals, and porous material particles 7 . Among them, the alkaline earth metal carbonate is composed of normal needle-shaped particles as the first group of particles 5 , and the second group of particles having a smaller average length L and a larger average diameter D than the first group of particles. This embodiment is equivalent to adding void material particles when manufacturing the cathode ray tube of the first embod...

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Abstract

It is an object to obtain a cathode ray tube having a high resolution without decreasing electron emission property. Surface of a cathode was leveled by heating during forming a vacuum in order to oxidize a carbonate salt to an oxide as an electron emissive material, after applying a paste for printing on a metal substrate by screen printing, drying the same, and incorporating an oxide cathode in a cathode ray tube, the paste having a mixture of needle-like particles of the first group and bulk particles of the second group incorporated as an alkaline earth metal carbonate forming an electron emissive material layer.

Description

technical field [0001] The present invention relates to a cathode ray tube having an oxide cathode and a manufacturing method thereof, and more particularly to an electron-emitting material layer on the cathode and a manufacturing method thereof. Background technique [0002] Figure 14 It is a cross-sectional view schematically showing a conventional oxide cathode shown in, for example, JP-A-8-77914. In the figure, 101 is a metal matrix containing nickel as the main component and containing reducing agents such as silicon and magnesium. The metal base 101 constitutes the bottom surface of a long cylindrical sleeve 102 and is disc-shaped. 103 is an electron emissive material layer coated on the metal base 101 and mainly composed of needle-shaped particles 105 of alkaline earth metal oxides such as barium, strontium, and calcium, for example. 104 is an incandescent wire installed in the sleeve 102 and heated to emit thermal electrons from the electron emitting material. Th...

Claims

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Application Information

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IPC IPC(8): H01J1/142H01J1/20H01J9/02H01J9/04
CPCH01J1/20H01J9/02H01J9/042H01J1/142H01J1/14
Inventor 齐藤清铃木量山口博新庄孝寺本浩行大平卓也
Owner MITSUBISHI ELECTRIC CORP
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