DE746498C - Directly heated helical cathode for cathode ray tubes - Google Patents

Directly heated helical cathode for cathode ray tubes

Info

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
Application number
DEL102526D
Other languages
German (de)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to DEL102526D priority Critical patent/DE746498C/en
Application granted granted Critical
Publication of DE746498C publication Critical patent/DE746498C/en
Expired legal-status Critical Current

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)

PATENTANSPRÜCHE: i. Direlzt -ellei7te %#"eil(lelförinige Kathode für Kathodenstrahlröhren, dadurch gekennzeichnet, (laß der gewendelte Heizdralit von zwei als Zuleitung zur Wendel ,A:enuilrleil Halterlräliten alls gut leitendem Werkstoff getragen ist, deren Durchmesser praktisch gleich dein Durchnie#ser der Wendel ist und die so gebogen sind, datli sie einen nahezu Igeschlosenen magnetischen Kreis für das bei dein Stromdurchfluß durch die Wendel eiitstehende magnetische Feld bilden. Direkt geheizte wendelförinige Katliocic für Kathodenstralilröhren nach Anspruch i. dadurch gekennzeichnet, (laß die Haltedrälite der Wendel aus ferromagnetischem, zur in Gla.# oder l#,-trani.ik geeignetem -Stoff bestehen. Zür Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik- ist iiii Erteiluii,#1-"#,verfalireii fol,-ende Druckschrift in Betracht gezogen worden: österreichische Patentschrift Nr. 137 264. PATENT CLAIMS: i. Direlzt -ellei7te% # "eil (lelf-shaped cathode for cathode ray tubes, characterized by (let the coiled heating wire be carried by two as a supply line to the coil, A: enuilrleil holder räliten all highly conductive material, the diameter of which is practically the same as the diameter of the coil and which are bent in such a way that they form an almost closed magnetic circuit for the magnetic field which is present when the current flows through the coil Gla. # Or l #, - trani.ik suitable -substance exist. In order to distinguish the subject of the application from the state of the art, iiii grantuii, # 1 - "#, expired following document has been considered: Austrian patent specification no. 137 264.
DEL102526D 1940-11-30 1940-12-01 Directly heated helical cathode for cathode ray tubes Expired DE746498C (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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.

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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