CN103367082A - An electronoc emitter for an X-ray tube and an X-ray containing the same - Google Patents

Abstract

The invention relates to an electronic emitter (16) for an X-ray tube (10). The electronic emitter (16) comprises a flat current-carrying conductor (20) for the emission of thermal electrons (e-) and a V-shaped zigzag structure.

Description

The electron emitter of X-ray tube and the X-ray tube with this electron emitter

Technical field

The present invention relates to a kind of electron emitter for X-ray tube, this electron emitter is made of the conductor that is used for thermionic emission flat, energising.The invention still further relates to a kind of X-ray tube with this electron emitter.

Background technology

For the so-called flat emitter of known use from DE2727907C2 for example of thermionic emission in X-ray tube, this flat emitter forms for lath recess, that materials with high melting point is made of introducing by alternately being provided with top-cross opposite each other, therefore, the energising ribbon conductor that forms by this way has back-shaped structure.Thisly represent with the form in vertical view or vertical section among Fig. 1 and 2 from electron emission body well known in the prior art.Introduce generally recess in thelamellar 2 of the thickness d that is formed by tungsten W orbreach 4 this be rectangle and width a be about ten microns to the hundreds of micron.Distance between thebreach 4 is designed at this, and the resistance relevant with width b with material, the thickness d of theribbon conductor 6 that forms by breach is enough high in order to improve in this wise temperature by the electric current in the predetermined voltage current downflow, so that thermionic emission occurs.

But this electron emitter is high by heating and cooling stage heat load, so it must be changed after the shorter life-span.

Summary of the invention

Therefore, technical problem to be solved by this invention is, a kind of electronic emitter for X-ray tube is provided, and this electronic emitter is made of the flat electrical conductor that is used for thermionic emission, the Service life of this conductor and must correspondingly less changing.In addition, technical problem to be solved by this invention provides a kind of X-ray tube with this electron emitter.

With regard to electron emitter, technical problem of the present invention solves by a kind of electron emitter for X-ray tube.By the present invention, electronic emitter comprises flat electrical conductor, and this conductor has the curved structure of V-arrangement.In other words, breach or the recess of introducing ribbon conductor have v-shaped structure, and court widens for the manufacture of the edge of the lath of this conductor.

Can produce the particle flux of free electron when the identical external dimensions by this structure, this particle flux is the same large with the particle flux that is produced by the known electron emitter of prior art in practice, and wherein, the while has obviously improved the life-span.

The present invention based on following understanding, can form short circuit owing to depending on the length prolongation or the shortening that obtain when heating or cooling in the adjacent ribbon conductor of complications, so cause by the known electron emission body life time of prior art short at this.By being formed on by V-notch provided by the invention between the ribbon conductor towards lateral edges increasing distance or gap, this distance or gap obviously reduce the risk of short circuit between the ribbon conductor that appears on the outward flange.Herein in practice, when until the edge a little widen tens microns, and other sizes have obtained to improve nine times life-span when keeping identical.Demonstrate in addition, the emission section of electronics is not affected by the curved structure of this V-arrangement in practice, because the fringe region of recess can not help electric current to carry and so electron emission in practice.

The concept " V-arrangement " of using in this application is interpreted as the structure similar to " V " at this.Therefore " V " arm needn't extend by straight line, also needn't overlap in the summit.Principal character is that breach is widened towards lateral edges.

Description of drawings

Characteristic, the feature and advantage that the present invention is above-mentioned and the mode that how to realize them and method are in conjunction with clearer and clear and definite in conjunction with the following example explanation relevant with accompanying drawing.

The embodiment that describes with reference to the accompanying drawings for other explanation of the present invention.In the accompanying drawing:

Fig. 1 and Fig. 2 are partial top view and the longitudinal sections of electronic emitter well known in the prior art.

Fig. 3 is the schematic diagram by X-ray tube of the present invention,

Fig. 4 and Fig. 5 are by electron emitter of the present invention simple partial top view and longitudinal section.

Embodiment

Press Fig. 3,X-ray tube 10 compriseshousing 12, is provided with anode opposite each other 14 andelectron emitter 16 in this housing 12.Have a high pressure betweenanode 14 andelectron emitter 16, make the electronics that penetrates from electron emitter accelerate and produce gamma-rays in this X ray towardsanode 14 by this high pressure, this gamma-rays is discharged by thewindow 18 that is arranged inhousing 12.

Fig. 4 and Fig. 5 illustrate the enlarged drawing by X ray reflector of the present invention.The X ray reflector comprisesconductor 20 flat, energising, and theribbon conductor 22 of this conductor has the curved structure of V-arrangement.This curved structure produces by recess or thebreach 24 of V-arrangement, and this recess orbreach 24 originate inedge 26 and widen by cutting with laser or line in little processing introducing lath and towards theedge 26 oflath.Breach 24 is like this moulding correspondingly so that its at the width a1 on theedge 26 greater than the width on the breach interior substrate.For example, the difference between a1 and the a2 is tensmicrons.Ribbon conductor 22adjacent arms 28 interconnect by thesubstrate 30 of extending betweenarm 28 point-blank at this.In the preferred form of implementation shown in the Figure 4 and 5, also provide thearm 28 linearly extended sides of V-notch 24 linearly extended arms andribbon conductor 22.

In the embodiment of this figure, also be provided with twosuch ribbon conductors 22 that are arranged side by side, thisribbon conductor 22 can be made by a unique lath by little processing equally.

Although at length further specify and described the present invention by preferred embodiment, the present invention is not limited to disclosed embodiment, and those skilled in the art can therefrom derive other modification, only otherwise exceeding protection scope of the present invention gets final product.

Claims (5)

1. that electron emitter (16) that is used for X-ray tube (10), this electron emitter have is flat, energising be used for hot electron (e^-) emission conductor (20), this conductor (20) has the curved structure of V-arrangement.

2. by electron emitter claimed in claim 1 (16), wherein, described conductor (20) consists of by the lath that is provided with V-notch (24).

3. by claim 1 or 2 described electron emitters (16), wherein, described curved structure arm (28) adjacent one another are interconnects by linearly extended substrate (30) between described arm.

4. by claim 1,2 or 3 described electron emitters (16), wherein, two ribbon conductors that are arranged side by side (22) design has the curved structure of V-arrangement.

5. an X-ray tube (10), it has by the described electron emitter of one of aforementioned claim (16).

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