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Oxide cathode for picture tube

A technology of oxide cathode and kinescope, which is applied in the field of kinescope to achieve the effect of increasing electrical conductivity

Inactive Publication Date: 2006-08-02
SHANGHAI NOVEL COLOR PICTURE TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The task of the present invention is to provide an improved oxide cathode for kinescope, which solves the problem that the oxide cathode of traditional kinescope can only be used under low current density

Method used

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  • Oxide cathode for picture tube
  • Oxide cathode for picture tube
  • Oxide cathode for picture tube

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Embodiment Construction

[0026] see figure 2 , a kind of oxide cathode for kinescope of the present invention comprises base metal 2 and sleeve 3, sleeve 3 and base metal 2 press-fit combination, base metal 2 is Ni material containing a small amount of activator Mg and Si, sleeve 3 has One or two inside and outside.

[0027] Below the base metal 2 , ie in the sleeve 3 , a heating element 4 is housed. An electron emission layer 1 is sprayed on the base metal 2 . There is also a second electron emission layer 5 on the first electron emission layer 1 , that is, two layers of electron emission layers 1 and 5 containing different components are sprayed sequentially on the base metal 2 .

[0028] The first layer of electron emission layer 1 is based on the main component alkaline earth metal oxide doped with two types of metal powder, one of which is Ni powder without reducing ability, and the other is W with reducing ability. pink. The alkaline earth metal oxides in the first electron emission layer 1...

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Abstract

The cathode includes base metal and sleeve press-fitted with the base metal. There are one or two sleeves including inner and outer sleeve. Heating unit is setup inside sleeve i.e. at lower part of base metal, and electronic emission layer is spray-coated on upper part of the base metal. The said electronic emission layer includes two sub layers. Based on main component alkali-earth oxide, two classes of metal powders are doped into the first sub layer. The said one metal powder is Ni powder without reducing power, and the other is W powder having reducing power. Main component of second electronic emission layer is alkali-earth oxide. Comparing with traditional cathode of oxide, the disclosed cathode possesses fine performance under large current for long stable operation.

Description

technical field [0001] The invention relates to a picture tube, in particular to an oxide cathode containing two types of metal powder for the picture tube. Background technique [0002] The oxide cathode of a traditional picture tube such as figure 1 As shown, firstly the base metal 2 and the sleeve 3 are press-fitted together, the sleeve 3 has one or two inside and outside, and then the electron emission paste 1 is sprayed on the base metal 2, the electron emission paste 1 is a carbonic acid Salt, binder, and organic solvent are mixed and prepared as a slurry suspension, and a heating element 4 is installed under the base metal 2, that is, in the sleeve 3 . Generally, the main component of the base metal 2 is Ni, which contains a small amount of reducing activators Mg and Si. Generally, the carbonate in the electron emission layer 1 has a certain proportion of (Ba, Sr, Ca)CO 3 . After the kinescope is assembled, the heating element 4 under the base metal 2 is heated in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/04H01J1/142
Inventor 张伟姜祥祺
Owner SHANGHAI NOVEL COLOR PICTURE TUBE
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