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Low-powder dipping-type cathode for cathode-ray tube

A low-power, cathode technology, applied in cathode ray tubes/electron beam tubes, discharge tubes, solid thermionic cathodes, discharge tubes, etc., can solve the problems of damage to wafer-shaped components and increased loss

Inactive Publication Date: 2002-10-16
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, disc-shaped elements may be damaged due to welding of the cup and inner sleeve
[0011] Third, losses due to heat conduction are increased due to the wide interface between the outer sleeve and the cathode holder

Method used

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  • Low-powder dipping-type cathode for cathode-ray tube
  • Low-powder dipping-type cathode for cathode-ray tube
  • Low-powder dipping-type cathode for cathode-ray tube

Examples

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Embodiment Construction

[0024] In describing in detail the preferred embodiment of the invention reference will be made to the examples illustrated in the accompanying drawings.

[0025] figure 2 A cross-sectional view showing a low power impregnated cathode according to the present invention.

[0026] In the present invention, the disc-shaped element 30 for emitting electrons is directly bonded to the inner sleeve 10 by welding without using the cup-shaped member in the prior art. The inner sleeve 10 is combined with the outer sleeve 20 through the sheet 3 . The cathode holder 8 is located near the outer sleeve 20 . In addition, the heater 6 is provided inside the inner sleeve 10 , that is, at the bottom of the disc-shaped element 30 .

[0027] Of course, the disc-shaped element 30 can also be mounted by using a cup and inner sleeve, as in the prior art, but it is desirable to realize the integration of the cup and inner sleeve to reduce the number of components and simplify assembly.

[0028] ...

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PUM

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Abstract

A low power impregnated cathode comprising: a disc-like element for emitting electrons and placed in the cup, a cup, an inner sleeve, a sheet and an outer sleeve, The cup is connected to an inner sleeve, said inner and outer sleeves being held together by a sheet, the disc-shaped element having a diameter at least 1.5 times less than its thickness, and the outer sleeve having a bottom outer diameter greater than its top outer diameter .

Description

technical field [0001] The present invention relates to impregnated cathodes for cathode ray tubes (hereinafter referred to as CRTs), in particular, low power impregnated cathodes for CRTs. Background technique [0002] In CRTs requiring high definition and high luminance, impregnated cathodes capable of emitting high electron beam currents for a long period of time have generally been used. [0003] refer to figure 1 A prior art impregnated cathode is described. [0004] A pellet 1 is placed in a cup 2, and the pellet 1 is used to emit electrons. The cup 2 is joined to the inner sleeve 4 by laser welding. The inner sleeve 4 and the outer sleeve 5 are joined together by the sheet 3 . A cathode holder (not shown) is located near the outer sleeve 5 . In addition, a heater 6 is installed inside the inner sleeve 4 , ie at the bottom of the disc-shaped element 1 . [0005] In the process of manufacturing the disc-shaped component 1, the metal powder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/26H01J1/28H01J29/04
CPCH01J1/26H01J1/28H01J29/04
Inventor 李钟焕
Owner LG ELECTRONICS INC