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Cathode in cathode-ray tube and its mfg. method

A technology for cathode ray tubes and cathodes, applied in the direction of cathode ray tubes/electron beam tubes, thermionic cathode manufacturing, electrode devices and related components, etc., which can solve the problems of complex manufacturing process, high cost, and reduced heat radiation ratio

Inactive Publication Date: 2006-04-05
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, since the manufacturing process is very complicated due to two blackening / reduction heat treatments, the aforementioned method is costly; since the inner surface of the cathode sleeve may be reduced in the reduction heat treatment, the heat radiation ratio is reduced; and in the blackening / reduction Difficulty controlling the degree of blackening / reduction of the inner and outer surfaces of the cathode sleeve during heat treatment

Method used

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  • Cathode in cathode-ray tube and its mfg. method
  • Cathode in cathode-ray tube and its mfg. method
  • Cathode in cathode-ray tube and its mfg. method

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Embodiment Construction

[0034] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0035] refer to Figure 3A , in the cathode of the CRT of the present invention, there is an emissive layer 100 formed on the upper portion, and a sleeve 110 having a heater 104 embedded therein, the sleeve 110 containing a blackening material and having a porous surface. That is, as shown in FIG. 3, the cathode sleeve 110 of the CRT of the present invention comprises a blackened material having a high emissivity ratio and has a porous surface with an enlarged surface. Preferably, the porous surface of the sleeve has a porosity of 10-50%.

[0036] Figure 4 and 5 Two graphs are shown in the figure, which respectively indicate the relationship between the porosity of the sleeve surface and the display time lag of the CRT image and the radiation ratio. Compared to CRT, the image display time lag is shortened by about 8-6...

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Abstract

The present invention relates to a cathode in a cathode ray tube. The cathode includes an emission layer at an upper part of the cathode and a sleeve for inserting a heater therein, wherein the sleeve contains a blackened material, and has a porous surface.

Description

technical field [0001] The present invention relates to a cathode ray tube, and more particularly, to a cathode in a cathode ray tube (CRT), which is used for reducing the power consumption of the heating tube and the image display time lag. Background technique [0002] refer to figure 1 , Generally, the CRT is equipped with a screen plate 1 with a fluorescent film coating; a shadow mask 4 fitted on the inside of the screen plate; and a funnel 2 with a funnel-shaped neck tube 3 at the rear. An electron gun 5 is housed within the neck tube 3, having a cathode 10 therein. A number of thermal electrons from the cathode 10 are focused to form an electron beam, controlled by a magnetic field originating from a deflection coil 7 around the outside of the neck, and the color selected at the shadow mask 4 lands on a predetermined position on the fluorescent film screen , and cause the fluorescent material to emit light to display an image. [0003] Referring to FIG. 2 , the cath...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/04H01J29/48H01J1/20H01J1/26H01J9/04
CPCH01J1/26H01J1/20H01J9/04H01J29/04
Inventor 元炳默
Owner LG ELECTRONICS INC