DE746498C - Directly heated helical cathode for cathode ray tubes - Google Patents
Directly heated helical cathode for cathode ray tubesInfo
- Publication number
- DE746498C DE746498C DEL102526D DEL0102526D DE746498C DE 746498 C DE746498 C DE 746498C DE L102526 D DEL102526 D DE L102526D DE L0102526 D DEL0102526 D DE L0102526D DE 746498 C DE746498 C DE 746498C
- Authority
- DE
- Germany
- Prior art keywords
- cathode
- ray tubes
- coil
- cathode ray
- directly heated
- 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
- Solid Thermionic Cathode (AREA)
Description
Direkt geheizte wendelförmige Kathode für Kathodenstrahlröhren x Es ist bei Kathodenstrahlröhren zweckmäßig, (las äußere magnetische Feld. das, LI durch den Heizstroin in der Umgebung fler Kathode erzeugt wird, möglichst zum Ver-,chwinden zu bringen, (la dieses Magnetfeld mif die aus dein Heizfaden austretenden Elektronen eine störende Wirkung ausübt and sie aus der gewünschten Richtung ablenkt. Diese Ablenkungen der Elektronen, die bei Gleichstroinheizung in einer konstanten Richtun- bei #\'ecli..;z,-Istroiillieizuiir, je- doch in wechselnder Richtung erfolgen, verhindern einen scharf begrenzten Leuchtfleck ,tu' dein Fluoreszenzschirni.Directly heated helical cathode for cathode ray tubes x It is advisable for cathode ray tubes (read the external magnetic field that is generated by the heating current in the vicinity of the cathode to disappear, if possible, (let this magnetic field with that from your filament escaping electrons exert a disturbing effect and deflect from the desired direction These deflections of electrons at Gleichstroinheizung in a constant direc- at # \ 'ECLI ..;. z, -Istroiillieizuiir, JE carried but in alternating directions, prevent a sharply delimited light spot, put on your fluorescent screen.
Uin nun das störende magnetische Feld einer direkt geheizten wendelförinigen Kathode für Kathodenstrahlröhren unwirksam zu machen, ist gemäß der Erfindun,- der ge-##endelte Ileizdraht von zwei -als Ztileittiii#-zur Wendel dienenden Haltedrähten aus illagnetisch gut- leitendein Werkstoli getra-11. deren Durchmesser praktisch gleich dem f)urchniesser der Wendel ist. und die so gebogen sind, daß sie einen nahezu geschlosseneu magnetischen Kreis für das bei dein Stroindurchflufl durch die Wendel entstehende magnetische Feld hilden.Uin now the disturbing magnetic field of a directly heated helical shape To make the cathode for cathode ray tubes ineffective is according to the invention, - the ge - ## ended Ileizdraht of two -as Ztileittiii # -to the helix serving holding wires made of non-magnetic, highly conductive, a work stole getra-11. their diameter practical is equal to the diameter of the helix. and which are so bent that they make one Almost closed magnetic circuit for the flow of your strokes through the filament creates a magnetic field.
Es ist aus fabrikatorischen Gründen zweckmäßig, die Haltedrähte der Welidel aus ierromagnetischem, zur F.inschinelzung ;ii Glas (,der Keramik "cei,#iieteiii Stoff herzustellen. Die Haltedrähte können dabei auch aus einer Legierung mehrerer ferromagnetischer 'Materialien bestehen. For manufacturing reasons, it is advisable to manufacture the Welidel's retaining wires from electromagnetic, finned glass (, ceramic, cei, # iieteiii material. The retaining wires can also consist of an alloy of several ferromagnetic materials.
In der Abbildung ist eine beispielsweise Ausführung der Erfindung dargestellt. 1 Und 2 sind die H.altedrähte der Heizweiidel 3. Diese Haltedrähte i und 2 bestehen aus einem -Material hoher Permeabilität, das seine guten magnetischen Eigenschaften auch z# bei der Arbeitstemperatur behält. Der die Wendel durchfließende Strom erzeugt Kraftlinien, die mit 4 bezeichnet sind. Diese KraftlInien stichen sich auf dein Wege des kleinsten magnetischen Widerstandes zu schlie-1-Jen. Dieser wird, wie in der Abb11-cliiii- dargestellt, durch die beiden Haltedrälite i und 2 der Wendel 3 gebildet- Diese Haltedrähte nähern sich einander iiii unteren Teil bis auf geringe Entfernung, so (laß (las Z, el inalflietische. von dem Stromdurchfluß durch t' die Wendel erzeugte Feld praktisch nuir in magnetisch gut leitendem Werkstoff verläuft.An example embodiment of the invention is shown in the figure. 1 and 2 are the holding wires of Heizweiidel 3. These holding wires i and 2 are made of a material of high permeability that retains its good magnetic properties even at working temperature. The current flowing through the coil generates lines of force, which are denoted by 4. These lines of force stick out on your way of the smallest magnetic resistance to close. This is, as shown in the Abb11-cliiii-, i by the two Haltedrälite and 2, the coil 3 gebildet- These support wires approach each other iiii lower part except for slight distance, (let (las Z, el inalflietische. Of the current flow The field generated by t 'the helix practically only runs in a magnetically highly conductive material.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL102526D DE746498C (en) | 1940-11-30 | 1940-12-01 | Directly heated helical cathode for cathode ray tubes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE221452X | 1940-11-30 | ||
DEL102526D DE746498C (en) | 1940-11-30 | 1940-12-01 | Directly heated helical cathode for cathode ray tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
DE746498C true DE746498C (en) | 1944-12-23 |
Family
ID=25762955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL102526D Expired DE746498C (en) | 1940-11-30 | 1940-12-01 | Directly heated helical cathode for cathode ray tubes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE746498C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1144405B (en) * | 1930-07-02 | 1963-02-28 | Philips Nv | Electron beam tubes with magnetic focusing means outside and inside the vacuum space, in particular klystron or traveling wave tubes |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT137264B (en) * | 1933-04-14 | 1934-04-25 | Lignose Hoerfilm System Breusi | Equipment on discharge vessels with a unidirectional electron beam. |
-
1940
- 1940-12-01 DE DEL102526D patent/DE746498C/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT137264B (en) * | 1933-04-14 | 1934-04-25 | Lignose Hoerfilm System Breusi | Equipment on discharge vessels with a unidirectional electron beam. |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1144405B (en) * | 1930-07-02 | 1963-02-28 | Philips Nv | Electron beam tubes with magnetic focusing means outside and inside the vacuum space, in particular klystron or traveling wave tubes |
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