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X-ray emitting foil with temporary fixing bars and preparing method therefore

A technology for fixing rods and foils, applied to X-ray tubes, X-ray tube electrodes, X-ray tube components, etc., can solve problems such as system failures, drastic changes in current paths, and structural deformation of emitter foils

Inactive Publication Date: 2010-03-24
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Fragile mechanical strength due to thin foil and fine structure with the above design
Deformation within the structure of the emitter foil may occur during the installation of the emitter foil onto the terminal secured in the cathode cup
The result can be a widening of the slit with a negative impact on the optical performance of the construction, or in the worst case, a short circuit in the conductive path and thus a system failure
The current path changes drastically, which can lead to system failure

Method used

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  • X-ray emitting foil with temporary fixing bars and preparing method therefore
  • X-ray emitting foil with temporary fixing bars and preparing method therefore
  • X-ray emitting foil with temporary fixing bars and preparing method therefore

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Embodiment Construction

[0036] figure 1 A directly heated thin flat emitter foil 1 is shown having a rectangular emitting surface formed by a finely structured central portion suitable for emitting electrons. The portion defines a conductive path and the high resistance required to release sufficient Joule heating. The foil 1 is fixed to the terminal 3 , for example by welding at point 4 . Furthermore, the foil 1 is divided into three segments of revolution 2 to increase the mechanical stability against external forces such as centrifugal forces on the gantry of a CT system.

[0037] figure 2 The foil is shown in more detail. The segments 2 of the emitter are separated by slits 5 . Furthermore, the first terminal fixed at point 41 is connected to ground potential and the second terminal fixed at point 42 is connected to a positive potential with respect to ground potential. The two terminals fixed on the other point 43 are electrically floating. Accordingly, current flows from point 42 to poin...

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Abstract

The invention describes an emitter device (10) and a method for precisely mounting a thin film electron emitter foil into a cathode cup. Therefore, small fixing bars (71) are realized to keep fine andhence weak emitter structures in position while fixing this setup onto a cathode cup. After mounting those temporary structures are removed (72) to get the final functional emitter-cathode setup.

Description

technical field [0001] The invention relates to the field of fast high-current electron sources for X-ray tubes. In particular, the invention relates to emitter devices for X-ray tubes with thin-film electron emitters, and methods of preparing such emitters before their application in X-ray tubes. Background technique [0002] Future requirements for high-end CT and CV imaging with respect to X-ray sources are higher power / tube current, shorter response time with respect to tube current (pulse modulation) and smaller focal spots for higher image quality ( FS). [0003] A key to achieving higher power in smaller FSs is achieved by using cutting-edge electron-optics concepts. But the source of the electrons themselves, and the starting state of the electrons, are just as important. [0004] For current high-end tubes, directly heated thin flat emitters are used, which are constructed to define the conductive path and obtain the required high resistance. Basically, two diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J35/06H01J9/04
CPCH01J9/04H01J35/06H01J1/15H01J35/064H01J35/066
Inventor S·胡特曼
Owner KONINK PHILIPS ELECTRONICS NV