Cathode filament, cathode assembly, magnetron and microwave cooking appliance

By using lanthanum-tungsten materials and a cathode filament with a lanthanum-tungsten carbide layer, the problem of unstable microwave output in magnetron microwave ovens at low power has been solved, achieving stable electron emission at as low as 100 watts, thus adapting to more microwave cooking scenarios.

CN122117719APending Publication Date: 2026-05-29GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD
Filing Date
2025-06-12
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing magnetron microwave ovens have unstable microwave output at power levels below 500 watts, and may even fail to output microwaves at all, affecting their application in low-power cooking scenarios.

Method used

The cathode filament is made of lanthanum-tungsten material and combined with a lanthanum-tungsten carbide layer. The carbonization process forms a spiral structure, which enhances the migration ability of rare earth elements and the electron emission capability, ensuring stable electron emission even at low power.

Benefits of technology

The increased electron emission capability of the cathode filament allows the magnetron to adapt to higher power demands, ensuring that the microwave oven can still operate stably at outputs as low as 100 watts, meeting the needs of low-power cooking.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking appliance. The cathode filament has a spiral structure, and a filament material of the cathode filament comprises a filament core and a carbonized layer, the carbonized layer at least wraps the filament core in a circumferential direction of the filament core, a material of the filament core comprises lanthanum tungsten material, and the carbonized layer comprises a lanthanum tungsten carbonized layer. In the cathode filament, the material of the filament core comprises the lanthanum tungsten material, and the carbonized layer comprises the lanthanum tungsten carbonized layer, which reduces the work function of the cathode filament to a certain extent, improves the migration ability of rare earth elements in the cathode filament, and thus the electron emission ability of the cathode filament can be improved to a certain extent, so that the magnetron can adapt to more power requirements of the microwave cooking appliance.
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