CN107039224B - Cathode - Google Patents
Cathode Download PDFInfo
- Publication number
- CN107039224B CN107039224B CN201710036813.XA CN201710036813A CN107039224B CN 107039224 B CN107039224 B CN 107039224B CN 201710036813 A CN201710036813 A CN 201710036813A CN 107039224 B CN107039224 B CN 107039224B
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- China
- Prior art keywords
- cathode
- pick
- electrode
- flat emitters
- run
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/045—Electrodes for controlling the current of the cathode ray, e.g. control grids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/06—Cathodes
- H01J35/064—Details of the emitter, e.g. material or structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/06—Cathodes
Abstract
The present invention relates to a kind of cathodes, the cathode has cathode taps (4), flat emitters (1) is disposed in the cathode taps (4), the flat emitters (1) launching electronics in the case where applying heating voltage, wherein, the flat emitters (1) are configured to have at least two planes of departure (2 being spaced apart from each other, 3) run-in index flat emitters, at least one conductive pick-off electrode (5) is introduced in the plane of departure (2, 3) on, the pick-off electrode (5) and run-in index flat emitters (1) are electrically isolated and are configured to helix according to the present invention.This cathode has good cut-off property and improved emission characteristics.
Description
Technical field
The present invention relates to a kind of cathodes with cathode taps, are disposed with flat emitters in the cathode taps, plane hair
Emitter launching electronics in the case where applying heating voltage.
Background technique
This cathode is for example known by 10 2,008 046 721 B4 of DE.The known cathode includes cathode taps,
Flat emitters are disposed in the cathode taps, flat emitters launching electronics in the case where applying heating voltage.The plane
Transmitter is configured to tool, and there are two the run-in index flat emitters for the plane of departure being spaced apart from each other, conductive pick-off electrodes
(Sperrelektrode) it is introduced on the plane of departure.The pick-off electrode and run-in index flat emitters are electrically isolated.Therefore,
The plane of departure being spaced apart from each other constitutes two sub- transmitters.In the case where known flat emitters, run in X-ray tube
Period applies heating voltage, thus emits the electronics accelerated towards anode direction.In these electrons hit anodes, in the table of anode
X-ray radiation is generated on face.
About volume to be heated and compared to spiral transmitter, this flat emitters have significantly larger be conducive to
The radiating surface of transmitting.Therefore, thus flat emitters can be mentioned with the operating temperature operation reduced relative to spiral transmitter
The service life of high cathode.
Due to bigger radiating surface (surface of emission), the higher flat emitters service life, which faces, is ending Shi Genggao by electric field
Consuming.
In numerous applications, it especially needs in the case where application pulsed X-ray radiation by applying in cathode taps
Negative voltage is ended.Especially the more central region of the flat emitters of large area geometrically with generate cutoff field,
Electron accumulation far apart in cathode taps, therefore can only be ended by higher electron density or higher field strength.
Higher field strength causes the consuming to avoid arcing and the bigger minimum spacing to be abided by and other construction aspects again.
In the cathode as known to 10 2,008 046 721 B4 of DE, pick-off electrode has cable architecture.Cable architecture for example by
More lines are formed, these wire bondings are on ceramics insulator or with sieve pressing plating.By DE 10 2,008 046 721
The cathode shown in Fig. 2 of B4 has the pick-off electrode implemented with flat wire, is arranged between two planes of departure.In this flat wire
It is formed from cathode taps milling.To be kept as grid voltage required for completely switched off flat emitters to the greatest extent by pick-off electrode
May be low, to exclude the voltage flying fox between run-in index plane emitter and cathode taps as far as possible.Therefore, by DE 10
Cathode known to 2008 046 721 B4 has had good cut-off.
Summary of the invention
The task of the present invention is realize a kind of cathode that can well end, with improved emission characteristics.
The task is solved by cathode of the present invention according to the present invention.The advantageous configuration of cathode according to the present invention is distinguished
It is also subject of the present invention.
Cathode according to the present invention includes cathode taps, is disposed with flat emitters in the cathode taps, the flat emitters
In the case where applying heating voltage launching electronics, wherein the flat emitters are configured to be spaced apart from each other at least two
The run-in index flat emitters of the plane of departure introduce at least one conduction at least two plane of departure being spaced apart from each other
Pick-off electrode, the pick-off electrode and run-in index flat emitters are electrically isolated.Therefore, in cathode according to the present invention, each other
Every the plane of departure form sub- transmitter.The pick-off electrode is configured to helix (Drahtwendel) according to the present invention.It is this
Helix is also referred to as coiled-coil filament (Gl ü hwendel), because realizing thermotropic electron emission when transmitting heated current.
The helix (coiled-coil filament) cable architecture for example with circular cross section or can have rectangular cross section
Cable architecture.Within the scope of the invention, the cable architecture with other cross sections can also be realized.Here, the cross of coiled-coil filament
Section needs not be constant, but can also change.
Flat emitters are divided at least two planes of departure by what is limited in the present invention, generate multiple be connected in parallel
Sub- transmitter, such as with about 1mm to the width of about 2mm and can under low blanking voltage grid end.
Pass through measure according to the present invention, that is, flat emitters are configured at least two transmittings being spaced apart from each other
The run-in index flat emitters of plane and in the flat emitters introduce be electrically isolated with flat emitters at least one lead
The pick-off electrode of electricity, by eliminate difference or only by higher blanking voltage ability achievable cut-off property the shortcomings that.By subtracting
On the one hand small blanking voltage is not needed to propose generator and transmission cable excessively high requirement, on the other hand be reliably avoided
High pressure flying fox.Therefore, cathode according to the present invention can be used for needing the application for quickly ending electron emission.Although tool
There is quickly cut-off property, but cathode according to the present invention also has high service life and improved emission characteristics.
Therefore, higher field strength is not needed in cathode according to the present invention and carrys out quick cut-off plane transmitter, to avoid
The arcing higher field strength needs the bigger minimum spacing to be abided by and other additional structural measures.
Within the scope of the invention, pick-off electrode (helix) can be that is, electric with focus head for instance in cathode taps potential
Connection.However, it's not necessary.Be also possible on the contrary pick-off electrode (helix) not only with flat emitters and also with
Cathode taps are electrically isolated, and are therefore in the potential different from cathode taps.
According to a kind of advantageous configuration of cathode, pick-off electrode (helix, coiled-coil filament) passes through at least one electric terminal
Heating voltage can be connected.Therefore, therefore helix can be switched on and off and independently of the heating voltage of flat emitters
As additional electronic emitter.Thus, for example the helix can in run-in index flat emitters part or all of failure
The function of run-in index flat emitters is at least partly undertaken, and ensures urgent operation in this way.In addition, this
Helix can be connected when operating normally in the case where cathode, so as to for example in the work with high electrical power (high tube current)
Make to protect flat emitters at point, therefore improves its service life.
A kind of especially advantageous embodiment of cathode according to the present invention is characterized in that, run-in index flat emitters
The plane of departure is configured to whole component.In order to manufacture run-in index flat emitters, such as by laser from sheet metal structure
Middle cutting.The run-in index flat emitters manufactured in this way have at least two isolated planes of departure (sub- transmitter)
And two connection pins (unrelated with the quantity of the plane of departure).This flat emitters can in manufacturing technology with it is known
Transmitter is equally easy to process and constructs in cathode taps.
However, may also be advantageously, by the plane of departure structure of run-in index flat emitters for specific applicable cases
It makes as isolated component.In this case, each plane of departure (sub- transmitter) all has two connection pins, thus its energy
Enough it is individually controlled the plane of departure.
Detailed description of the invention
Below according to the attached drawing embodiment that the present invention is further explained, which is schematical, rather than restricted
's.
Fig. 1 shows the perspective view of run-in index flat emitters present in the embodiment of cathode according to the present invention.
Specific embodiment
In Fig. 1, run-in index flat emitters are indicated with appended drawing reference 1 comprising two planes of departure 2 being spaced apart from each other
The connection pin being not shown in the accompanying drawings is respectively provided with 3 (sub- transmitters) and in front.The plane of departure 2 and 3 is embodied as rectangle
And the sheet metal of such as thickness of the 0.1mm made of tungsten constitute, the side length of 10mm is multiplied with 1.45mm.The plane of departure
2 and 3 are respectively provided with slot 2a, 2b, 3a and 3b, they alternately stretch out from two opposed sides and are transversely to the machine direction arrangement.
The plane of departure 2 and 3 is configured to whole component, so that transmitting is flat when applying heating voltage on connecting pin
Therefore face 2 and 3 is in identical potential and thermal electron.
Flat emitters 1 in manufacturing technology can as is known flat emitters it is equally easy to process.It therefore, being capable of example
The structure of the plane of departure 2 and 3 is such as cut from sheet metal with laser and slot 2a, 2b, 3a and 3b are set.
Flat emitters 1 are embedded into cathode taps 4.Due to its size (width identical with known flat emitters, length
The shape of degree and connection pin), flat emitters 1 can unquestionably substitute known flat emitters.
In the cathode taps 4 shown in, arranged in a manner of electrical isolation just between two adjacent planes of departure 2 and 3
There is a pick-off electrode 5.Within the scope of the invention, it can also be arranged between the adjacent plane of departure 2 and 3 more than one
Pick-off electrode.
According to the present invention, pick-off electrode 5 is configured to helix (coiled-coil filament) and is arranged in two to be spaced apart from each other
The plane of departure 2 and 3 between so that between the plane of departure 2 and 3 and helix 5 (pick-off electrode) formed gap 6.In addition, spiral shell
Spin line 5 is by sightless seal in the accompanying drawings (such as by Al2O3It is made) it is electrically isolated with run-in index flat emitters 1.Cause
This, the helix 5 arranged to the electrical isolation is spaced by surrounding gap and two planes of departure 2 and 3, thus in cathode operation
It is not in short circuit.
When cathode taps 4 contact pick-off electrode 5, blanking voltage can be for example applied in cathode taps 4.If pick-off electrode
5 are arranged in a manner of electrical isolation relative to cathode taps 4, then blanking voltage is applied directly on pick-off electrode 5.
When applying heating voltage, thermal electron (not shown), these electronics accelerate towards the direction of unshowned anode,
The anode is for instance in UAThe anode potential of=+ 80kV.
Run-in index flat emitters 1 are in the cathode potential U of such as -80kVK。
If pick-off electrode 5 is arranged in a manner of electrical isolation relative to cathode taps 4, pick-off electrode 5 (helix, spiral
Shape filament) blanking voltage U can be connectedS, the blanking voltage is compared to cathode potential UK=-80kV is negative.If pick-off electrode 5
Connect blanking voltage US, then negatively charged electronics is reliably avoided to emit from run-in index flat emitters 1.Shown in
In embodiment, US=-85kV.
If cutting off blanking voltage (US=UK+ 0kV, i.e. US=-80kV), then these electronics can in the clear towards the sunlight
The direction of pole moves.Therefore, pick-off electrode 5 can be in two potential levels, switch between -80kV and -85kV.
In the shown embodiment, emitted by the geometry realization of selected cathode taps 4 from the plane of departure 2 and 3
It focuses required for electronics, for clarity not completely shown cathode taps in the figure.
Above-mentioned voltage value should be understood merely as example.For professional, other voltage values can also have no to ask
It realizes on topic ground.
Therefore, be especially well suited for being desired or needed for can compared to for spiral transmitter for cathode according to the present invention
The quickly application (such as in application by pulsed X-ray radiation) of cut-off electron emission.In addition, yin according to the present invention
Pole has at the same time under the service life of higher run-in index flat emitters 1, also has improved emission characteristics, thus real
The longer service life of existing cathode.
Claims (6)
1. a kind of cathode, the cathode has cathode taps (4), is disposed in the cathode taps flat emitters (1), described flat
Terrestrial transmitter (1) launching electronics in the case where applying heating voltage, wherein the flat emitters (1) are configured to have
The run-in index flat emitters of at least two planes of departure (2,3) being spaced apart from each other, at least one conductive pick-off electrode (5) quilt
It is introduced on the plane of departure (2,3), the pick-off electrode (5) and the run-in index flat emitters (1) are electrically isolated, special
Sign is that the pick-off electrode (5) is configured to helix.
2. cathode according to claim 1, which is characterized in that the pick-off electrode (5) is in the electricity of the cathode taps (4)
Gesture.
3. cathode according to claim 1, which is characterized in that the pick-off electrode (5) and the cathode taps (4) electricity every
From.
4. cathode according to claim 1, which is characterized in that the pick-off electrode (5) can pass through at least one electric end
Son connects heating voltage.
5. cathode according to claim 1, which is characterized in that the transmitting of the run-in index flat emitters (1) is flat
Face (2,3) is configured to whole component.
6. cathode according to claim 1, which is characterized in that the transmitting of the run-in index flat emitters (1) is flat
Face (2,3) is configured to isolated component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016200698.3 | 2016-01-20 | ||
| DE102016200698.3A DE102016200698B4 (en) | 2016-01-20 | 2016-01-20 | cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107039224A CN107039224A (en) | 2017-08-11 |
| CN107039224B true CN107039224B (en) | 2019-03-01 |
Family
ID=59256322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710036813.XA Active CN107039224B (en) | 2016-01-20 | 2017-01-18 | Cathode |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107039224B (en) |
| DE (1) | DE102016200698B4 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6464551B1 (en) * | 1998-06-08 | 2002-10-15 | General Electric Company | Filament design, method, and support structure |
| CN101443876A (en) * | 2006-05-11 | 2009-05-27 | 皇家飞利浦电子股份有限公司 | Emitter design including emergency operation mode in case of emitter-damage for medical x-ray application |
| CN102222593A (en) * | 2010-04-14 | 2011-10-19 | 通用电气公司 | Low bias mA modulation for X-ray tubes |
| CN102243960A (en) * | 2010-05-11 | 2011-11-16 | 西门子公司 | Thermionic surface emitter and associated method to operate an x-ray tube |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008046721B4 (en) | 2008-09-11 | 2011-04-21 | Siemens Aktiengesellschaft | Cathode with a parallel flat emitter |
| DE102009009159A1 (en) * | 2009-02-16 | 2010-10-14 | Siemens Aktiengesellschaft | Focus head for X-ray tube, has emitter surrounded by blocking electrodes that are applied with blocking potential independent of one another, so that areas of emitting surface are blocked with respect to electron emission |
| US8027433B2 (en) * | 2009-07-29 | 2011-09-27 | General Electric Company | Method of fast current modulation in an X-ray tube and apparatus for implementing same |
| DE102012209089A1 (en) * | 2012-05-30 | 2013-12-05 | Siemens Aktiengesellschaft | X-ray tube has electrically heated electron emitters whose emitter regions carries current having mutually different temperatures in rotational direction of rotary anode |
-
2016
- 2016-01-20 DE DE102016200698.3A patent/DE102016200698B4/en active Active
-
2017
- 2017-01-18 CN CN201710036813.XA patent/CN107039224B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6464551B1 (en) * | 1998-06-08 | 2002-10-15 | General Electric Company | Filament design, method, and support structure |
| CN101443876A (en) * | 2006-05-11 | 2009-05-27 | 皇家飞利浦电子股份有限公司 | Emitter design including emergency operation mode in case of emitter-damage for medical x-ray application |
| CN102222593A (en) * | 2010-04-14 | 2011-10-19 | 通用电气公司 | Low bias mA modulation for X-ray tubes |
| CN102243960A (en) * | 2010-05-11 | 2011-11-16 | 西门子公司 | Thermionic surface emitter and associated method to operate an x-ray tube |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102016200698B4 (en) | 2023-11-16 |
| DE102016200698A1 (en) | 2017-07-20 |
| CN107039224A (en) | 2017-08-11 |
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