Cathode ray tube comprising cathode of composite material

A cathode ray tube, cathode metal technology, applied in the direction of cathode ray tube/electron beam tube, discharge tube solid thermionic cathode, discharge tube, etc., can solve problems such as instability

Inactive Publication Date: 2005-11-16
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After baking the cathode, the cathode has been able to produce a significant emission current, but is still unstable

Method used

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  • Cathode ray tube comprising cathode of composite material
  • Cathode ray tube comprising cathode of composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Such as figure 1 As shown, the oxide cathode in the cathode ray tube according to the first embodiment of the present invention has a hat-shaped cathode substrate composed of nickel and an alloy of 0.03 wt % Mg, 0.02 wt % Al, 1.0 wt % W. The cathode base is located on top of the cylindrical cathode carrier (sleeve), where the heater is installed.

[0051] On top of the cathode substrate there is a cathode coating. To form the cathode coating, the cathode substrate was first cleaned, then a mixture of 3.0% by weight scandium oxide powder and 97% by weight oxide starting compound powder was suspended in a solution of ethanol, butyl acetate and nitrocellulose. Scandium oxide powder has a long granular structure with an average particle size of 3±2 μm. The oxide starting compound powder consisted of co-precipitated barium-strontium-calcium-carbonate in a weight ratio of 22:12:1, and 150 ppm scandium oxide.

[0052] The suspension is sprayed onto the cathode substrate. T...

Embodiment 2

[0055] Such as figure 1 As shown, the cathode in the cathode ray tube according to the second embodiment of the present invention has a cap-shaped cathode substrate composed of nickel and an alloy of 0.1 wt % Mg, 0.06 wt % Al, 2.0 wt % W. The cathode base is located on top of the cylindrical cathode carrier (sleeve), where the heater is mounted. On top of the cathode substrate there is a cathode coating.

[0056] To form the cathode coating, the cathode substrate was first cleaned, then a mixture of 1.50 wt% yttrium oxide powder and 98.5 wt% oxide starting compound powder was suspended in a solution of ethanol, butyl acetate and nitrocellulose. The yttrium oxide powder has a long granular structure with an average particle size of 2 μm. The oxide starting compound powder consisted of co-precipitated barium-strontium-carbonate, and 100 ppm yttrium oxide in a weight ratio of 1:1.

[0057] The suspension is sprayed onto the cathode substrate. The layer thickness is 70 μm. Th...

Embodiment 3

[0060] Such as figure 1 As shown, the cathode in the cathode ray tube according to the third embodiment of the present invention has a cap-shaped cathode substrate composed of nickel and an alloy of 0.05% by weight of Mg, 0.05% by weight of Al and 2.0% by weight of W. The cathode base is located on top of the cylindrical cathode carrier (sleeve), where the heater is installed. On top of the cathode substrate there is a cathode coating.

[0061] To form the cathode coating, the cathode substrate was first cleaned, then a mixture of 1.2 wt% scandium oxide powder and 98.8 wt% oxide starting compound powder was suspended in a solution of ethanol, butyl acetate and nitrocellulose. Scandium oxide powder has a long granular structure with an average particle size of 1.7 μm. The alkaline earth metal oxide starting compound powder consists of co-precipitated barium-strontium-calcium-carbonate in a weight ratio of 1:1, and a particle size of 120 ppm d 50 <0.4μm yttrium oxide composit...

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Abstract

A cathode ray tube provided with at least one oxide cathode comprising a cathode carrier with a cathode base of a cathode metal and a cathode coating of an electron-emitting material containing a particle-particle composite material of oxide particles of an alkaline earth oxide selected from the group formed by the oxides of calcium, strontium and barium, and oxide particles having a first grain size distribution of an oxide selected from the group formed by the oxides of scandium, yttrium and the lanthanoids, and oxide particles having a second grain size distribution of an oxide selected from the group formed by the oxides of scandium, yttrium and the lanthanoids. The invention also relates to an oxide cathode.

Description

technical field [0001] The invention relates to a cathode ray tube having at least one oxide cathode comprising a cathode support with a cathode substrate of a cathode metal and a cathode coating of an electron-emitting material comprising barium oxide, a further alkaline earth metal oxide and yttrium oxide, scandium oxide, or a rare earth metal oxide, which exist in the form of oxide particles. Background technique [0002] A cathode ray tube consists of 4 functional parts: [0003] - generation of electron beams in electron guns, [0004] - use electric or magnetic lenses to focus the electron beam, [0005] - electron beam deflection to produce a grating, and [0006] - Fluorescent or display screens. [0007] The functional part concerned with the generation of the electron beam consists of the electron-emitting cathode capable of generating the electron flow in the cathode ray tube, which is surrounded by a control grid, eg a control electrode with a perforated aper...

Claims

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Application Information

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IPC IPC(8): H01J1/20H01J1/142H01J29/04
CPCH01J1/142H01J29/04
Inventor G·F·格尔特纳P·A·M·范德海德W·M·约翰斯通
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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