DE629492C - Arrangement for the compensation of the influence of the magnetic field of the heating current with direct alternating current supply of the filament of cathode ray tubes - Google Patents
Arrangement for the compensation of the influence of the magnetic field of the heating current with direct alternating current supply of the filament of cathode ray tubesInfo
- Publication number
- DE629492C DE629492C DEB163944D DEB0163944D DE629492C DE 629492 C DE629492 C DE 629492C DE B163944 D DEB163944 D DE B163944D DE B0163944 D DEB0163944 D DE B0163944D DE 629492 C DE629492 C DE 629492C
- Authority
- DE
- Germany
- Prior art keywords
- filament
- compensation
- arrangement
- influence
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission
Landscapes
- Arc Welding Control (AREA)
Description
Anordnung zur Kompensation des Einflusses des magnetischen Feldes des Heizstromes bei direkter Wechselstromspeisung des Glühfadens von Kathodenstrahlröhren Nach dem Hauptpatent 569 578 wird das magnetische Feld des Heizstromes bei direkter Wechselstromspeisung des Glühfadens, in dessen Nähe eine - ein statisches Feld @erzeugende Elektrode angeordnet ist, durch die ein entgegengesetzt gerichtetes elektrisches Feld von der Frequenz des Heizstromes erzeugt wird, statisch kompensiert.Arrangement for the compensation of the influence of the magnetic field of the heating current with direct alternating current supply of the filament of cathode ray tubes According to the main patent 569 578 the magnetic field of the heating current is with direct alternating current supply of the filament, in the vicinity of which an - a static field @generating electrode is arranged, through the an oppositely directed electric field is generated by the frequency of the heating current, statically compensated.
Gemäß der vorliegenden Zusatzerfindung läßt sich die Zusatzelektrode und damit eine besondere Einschmelzung im Quetschfuß und eine zusätzliche Justierung vermeiden. Die Haltedrähte für den Glühkathodendraht i und z in Fig. i und a werden über die Schweißstellen hinaus verlängert, so daß.-auch oberhalb der Schweißstellen :ein, statisches Feld von der Frequenz des Heizwechselstromes besteht. - Der Glühkathodenfaden 3 mit der mit emittierendem Oxyd bedeckten Kuppe q. wird gegenüber der durch die Haltedrähte i und z bestimmten .Ebene um 9o° verdreht. Die Drehrichtung ist hierbei so zu wählen, daß das elektrische Störfeld des Heizfadens durch das elektrische Feld der Haltedrähte kompensiert wird, daß. also beide Felder einander ,entgegengesetzt sind. Die Stärke des magnetischen Störfeldes des Heizfadens ist abhängig von dem Durchmesser der Fadenschleife und dem Heizstrom und damit auch von der Heizspannung. Die Stärke des elektrostatischen Kompensationsfeldes hängt ab% von dem Abstand der über den Schweißstellen befindlichen Teile der Haltedrähte und der Heizspannung. Liegen die Abstände der Haltedrähte und der Dufchmesser der - Fadenschleife für eine bestimmte Heizspannung und einen bestimmten Heizstrom fest, so tritt auch bei kleineren Heizströmen eine ausreichende Kompensation ein, da bei größeren Heizströmen und @spannungen sowohl das magnetische Störfeld als auch das statische Kompensationsfeld kräftiger werden. Die Zunahme der Feldstärken in Abhängigkeit von den Betriebsdaten ist zwar nicht exakt proportional, aber für die Praxis. ausreichend.According to the present additional invention, the additional electrode and thus a special seal in the pinch foot and an additional adjustment avoid. The holding wires for the hot cathode wire i and z in Fig. I and a are extended beyond the welds, so that.-also above the welds : there is a static field of the frequency of the alternating heating current. - The hot cathode filament 3 with the dome covered with emitting oxide q. is compared to that by the Holding wires i and z determined plane twisted by 90 °. The direction of rotation is here to choose so that the electrical interference field of the filament through the electrical Field of the retaining wires is compensated that. so both fields are opposite to each other are. The strength of the magnetic interference field of the filament depends on the Diameter of the thread loop and the heating current and thus also of the heating voltage. The strength of the electrostatic compensation field depends on the distance of the% Parts of the retaining wires and the heating voltage located above the welding points. Are the distances between the holding wires and the diameter of the - thread loop for a certain heating voltage and a certain heating current, so also occurs A sufficient compensation for smaller heating currents, since larger heating currents and @voltages both the magnetic interference field and the static compensation field get stronger. The increase in field strengths depending on the operating data is not exactly proportional, but for practice. sufficient.
Der wesentliche Vorteil dieser Anordnung ist die Billigkeit und Einfachheit- in der serienmäßigen Herstellung und eine ausreichende Kompensation bei verschiedenen Betriebsdaten.The main advantage of this arrangement is its cheapness and simplicity- in series production and sufficient compensation for different Operating data.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB163944D DE629492C (en) | 1936-01-25 | Arrangement for the compensation of the influence of the magnetic field of the heating current with direct alternating current supply of the filament of cathode ray tubes |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB163944D DE629492C (en) | 1936-01-25 | Arrangement for the compensation of the influence of the magnetic field of the heating current with direct alternating current supply of the filament of cathode ray tubes | |
| GB242836A GB466046A (en) | 1936-01-25 | 1936-01-25 | Arrangement for neutralizing the effect of the magnetic field of the filament current when an alternating current is used for directly heating the filament in cathode-ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE629492C true DE629492C (en) | 1936-05-02 |
Family
ID=25968892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEB163944D Expired DE629492C (en) | 1936-01-25 | Arrangement for the compensation of the influence of the magnetic field of the heating current with direct alternating current supply of the filament of cathode ray tubes |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE629492C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488366A (en) * | 2021-06-10 | 2021-10-08 | 纳境鼎新粒子科技(广州)有限公司 | Electron source |
-
0
- DE DEB163944D patent/DE629492C/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113488366A (en) * | 2021-06-10 | 2021-10-08 | 纳境鼎新粒子科技(广州)有限公司 | Electron source |
| CN113488366B (en) * | 2021-06-10 | 2024-03-15 | 纳境鼎新粒子科技(广州)有限公司 | Electron source |
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