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Cathode filament and cathode lamp

A cathode and filament technology used in cathode lamps. It can solve the problems of poor thermal uniformity of the filament assembly, uneven pitch, and influence on cathode emission, and achieve the effects of less on-off times of the filament, improved winding stability, and good winding stability.

Active Publication Date: 2016-04-27
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally wound filaments are prone to the problem of poor stability of tungsten-rhenium wire displacement and looseness on the molybdenum wire, which leads to problems such as uneven pitch. The thermal uniformity of the filament assembly is relatively poor, which affects cathode emission. At the same time, the filament assembly The number of on and off is relatively small, which affects the life of the cathode

Method used

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preparation example Construction

[0036] The present invention also provides a method for preparing a cathode filament, which includes the process of continuously winding a tungsten-rhenium wire 1 on the outer periphery of a molybdenum wire 2, wherein the tungsten that is continuously wound on the outer periphery of the molybdenum wire 2 The rhenium wire 1 includes a first winding circle 3 and a second winding circle 4, the first winding circle 3 is 45-55 turns, and the distance between two adjacent turns is 0.2-0.3mm, and the second winding circle 4 is 1-4 turns, the distance between two adjacent turns is 1-4mm, and the distance between the first winding circle 3 and the second winding circle 4 is 0.5-2mm.

[0037] Preferably, the first winding circle 3 is 48-53 turns, and the distance between two adjacent turns is 0.23-0.27mm; the second winding turn 4 is 1-3 turns, and the distance between two adjacent turns is 0.23-0.27mm. The distance between them is 1-3 mm, and the distance between the first winding circ...

Embodiment 1

[0049] Carry out the first winding of tungsten-rhenium wire 1 with the travel speed of molybdenum wire 2 as 15mm / min and the winding speed of tungsten-rhenium wire 1 as 131mm / min, then, change the winding speed of tungsten-rhenium wire 1 into 50mm / min for tungsten A second winding of rhenium wire 1 yielded a filament (17.05 mm in length). Its structure is as follows: the number of turns of the first winding circle 3 is 49 turns, the interval between two adjacent turns is 0.25mm, the number of turns of the second winding turn 4 is 2 turns, and the interval between two adjacent turns is 2mm , the distance between the first winding circle and the second winding circle is 0.8 mm.

Embodiment 2

[0051] Carry out the first winding of tungsten-rhenium wire 1 with the travel speed of molybdenum wire 2 as 15mm / min and the winding speed of tungsten-rhenium wire 1 as 133mm / min, then, change the winding speed of tungsten-rhenium wire 1 into 50mm / min for tungsten Second winding of rhenium wire 1, resulting in a filament (16.96 mm in length). Its structure is as follows: the number of turns of the first winding circle 3 is 51 turns, the interval between two adjacent turns is 0.26 mm, the number of turns of the second winding turn 4 is 2 turns, and the interval between two adjacent turns is 1.5 mm. mm, the distance between the first winding circle and the second winding circle is 0.7 mm.

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Abstract

The invention discloses a lamp filament used for a cathode. The lamp filament used for the cathode comprises a molybdenum wire and a tungsten-rhenium wire. The tungsten-rhenium wire is continuously wound on the periphery of the molybdenum wire. The tungsten-rhenium wire which is continuously wound on the periphery of the molybdenum wire comprises first winding circles and second winding circles. The number of the first winding circles is 44 to 55, and the distance between every two adjacent first winding circles is 0.2-0.3 mm. The number of the second winding circles is 1 to 4, and the distance between every two adjacent second winding circles is 0.5-2 mm. The invention further provides a lamp for the cathode. The lamp has good winding stability and heat uniformity.

Description

technical field [0001] The invention relates to the field of microwave electric vacuum, in particular to a cathode filament of a traveling wave tube and a cathode lamp including the cathode filament. Background technique [0002] The traditional barium tungsten cathode is a hot cathode, and the filament needs to provide the necessary heat during operation. Uniform heating is very important for the stability of cathode emission. Before the filament is formed, it is necessary to wind the tungsten-rhenium wire on the molybdenum wire to form a certain pitch and number of turns. Traditionally wound filaments are prone to the problem of poor stability of tungsten-rhenium wire displacement and looseness on the molybdenum wire, which leads to problems such as uneven pitch. The thermal uniformity of the filament assembly is relatively poor, which affects cathode emission. At the same time, the filament assembly The number of on and off is relatively small, which affects the life of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J23/04H01J9/04
Inventor 吴华夏孟昭红陈爱民于晨晨卞磊邹莺歌王莹
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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