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surface emitter

A technology for emitters and end regions, applied in X-ray tubes, X-ray tube electrodes, parts of X-ray tubes, etc., can solve problems such as damage to surface emitters

Active Publication Date: 2021-07-23
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of the column geometry is the high stiffness (spring and torsional stiffness) of the joint in the focusing head
If the stiffness is too high, due to the longitudinal expansion of the surface emitter, an excessively high push-back force of the joint occurs, which can lead to damage to the surface emitter

Method used

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Experimental program
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Effect test

Embodiment Construction

[0035] exist figure 1 The area emitter denoted by 1 includes a rectangular emitter area 2 which emits electrons when a heating voltage is applied.

[0036] The emitter surface 2 has cutouts 2 a and 2 b which are arranged alternately from two opposite sides and transversely to the longitudinal direction and parallel to each other.

[0037] The area emitter 1 has a first end region 3 on a first end side of the emitter area 2 and a second end region 4 on a second end side.

[0038] A first connecting leg 5 is arranged in the first end region 3 and a second connecting leg 6 is arranged in the second end region 4 .

[0039] The first connecting leg 5 and the second connecting leg 6 each have a cylindrical cross-section, that is to say are each formed in the shape of a round rod and are each fastened to a surface-emitting connection by means of a cohesive connection (welding or soldering). on the back side of device 1. The connecting legs 5 and 6 thus form a support rod for the e...

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PUM

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Abstract

The invention relates to an area emitter comprising: an emitter area (2), which emits electrons when a heating voltage is applied; and a first end region (3), which has at least a first connecting leg (7); and a second end region (4) having at least one second connecting leg (8). According to the invention, at least one connecting leg ( 7 , 8 ) is designed as a strip-shaped connecting leg ( 7 ; 8 ) and is twisted at a predeterminable angle along the longitudinal axis. According to a preferred refinement, the first connecting leg (7) and the second connecting leg (8) are formed as strip-shaped connecting legs (7, 8) and are each twisted at a predeterminable angle along the longitudinal axis. This results in a structurally simple area emitter which has a longer service life and high electron emission.

Description

technical field [0001] The invention relates to a surface emitter. Background technique [0002] Such area emitters are used as electron sources and are arranged in the cathode of the x-ray tube. The electrons generated by the area emitter through resistance heating, ie through energization (application of a heating current), are accelerated in the direction of the anode (target). When electrons impinge on the anode, these electrons are braked, whereby X-ray radiation is generated, which can be used, for example, for diagnostic imaging, radiotherapy, analytical material research or safety inspections. [0003] During operation of the X-ray tube, a heating voltage (resistive heating) is applied to the surface emitter, which preferably consists of tungsten, tantalum or rhenium, so that it is heated to a temperature of up to 2600° C., whereby the electrons due to their thermal motion can The characteristic work function of the emitter material is overcome and thus provided as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J35/06
CPCH01J35/064H01J1/16H01J1/18H01J35/065H01J2235/06
Inventor 弗洛里安·瑟颇然特
Owner SIEMENS HEALTHCARE GMBH