DE826039C - Ferromagnetic deflection system - Google Patents
Ferromagnetic deflection systemInfo
- Publication number
- DE826039C DE826039C DEF694A DEF0000694A DE826039C DE 826039 C DE826039 C DE 826039C DE F694 A DEF694 A DE F694A DE F0000694 A DEF0000694 A DE F0000694A DE 826039 C DE826039 C DE 826039C
- Authority
- DE
- Germany
- Prior art keywords
- deflection system
- coil
- web
- deflection
- direct current
- 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
- 230000005294 ferromagnetic effect Effects 0.000 title claims description 4
- 230000005284 excitation Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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
- H01J29/70—Arrangements for deflecting ray or beam
- H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
- H01J29/76—Deflecting by magnetic fields only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/96—Circuit elements other than coils, reactors or the like, associated with the tube
- H01J2229/964—Circuit elements other than coils, reactors or the like, associated with the tube associated with the deflection system
Landscapes
- Particle Accelerators (AREA)
Description
Das Hauptpatent 810 792 betrifft ein ferromagnetisches Ablenksystem zur Ablenkung von Elektronenstrahlen. Durch die mechanische Ausbildung des Ablenksystems sowie durch eine besondere Schaltung der das Ablenksystem erregenden stromdurchflossenen Spulen wird erreicht, daß sich der von der Gleichstromkomponente des Ablenkstroms verursachte magnetische Gleichfluß über das Eisenjoch schließt und im Ablenkraum praktisch kein Gleichfeld vorhanden ist.The main patent 810 792 relates to a ferromagnetic deflection system for deflecting electron beams. The mechanical design of the deflection system and a special circuit of the current-carrying coils that excite the deflection system ensure that the direct magnetic flux caused by the direct current component of the deflection current closes over the iron yoke and there is practically no direct field in the deflection space.
Die vorliegende Erfindung bezieht sich auf eine für die praktische Verwendbarkeit besonders vorteilhafte Ausführungsform dieser Ablenksysteme.The present invention relates to one for practical Usability of particularly advantageous embodiment of these deflection systems.
Das Hauptpatent gibt die Lehre, zur Ablenkung von Elektronenstrahlen ferromagnetische Ablenksysteme mit Polschuhen und zwei parallelen Stegen zu verwenden, die von wechselstrommäßig parallel geschalteten Spulen erregt werden. Die Spulen sind dabei derart geschaltet, daß die Wechselstromkomponente des Ablenkstroms durch beide Spulen, hingegen die Gleichstromkomponente nur durch eine Spule fließt. Gemäß der vorliegenden Erfindung wird der Steg, welcher die von der Gleichstromkomponente durchflossene Spule trägt, mit einem Luftspalt versehen und die Windungszahlen derart bemessen, daß sie sich umgekehrt verhalten wie die Windungsinduktivitäten der Streuinduktivitäten dieser Spulen.The main patent teaches the deflection of electron beams to use ferromagnetic deflection systems with pole pieces and two parallel webs, which are excited by coils connected in parallel with alternating current. The spools are connected in such a way that the alternating current component of the deflection current passes through both coils, whereas the direct current component only flows through one coil. According to of the present invention, the web which is formed by the direct current component carries through-flow coil, provided with an air gap and the number of turns in such a way dimensioned so that they behave inversely as the winding inductances of the leakage inductances these coils.
Im nachstehenden wird die Erfindung an Hand eines Ausführungsbeispieles erläutert.In the following, the invention is illustrated by means of an exemplary embodiment explained.
Die Abbildung zeigt schematisch ein Doppelstegjoch, dessen Polschuhe eine nicht gezeichnete Elektronenstrahlröhre umschließen. Die beiden Erregerspulen sind wechselstrommäßig parallel geschaltet, der Kondensator C verhindert den Gleichstromfluß durch die eine Erregerspule.The figure shows schematically a double web yoke, its pole shoes enclose a cathode ray tube (not shown). The two excitation coils are connected in parallel in terms of alternating current, the capacitor C prevents the flow of direct current through the one excitation coil.
Sind die beiden Stege I und II gleichartig ausgebildet, so müssen die Windungszahlen n1 bzw. n2 der beiden zugehörigen Erregerspulen gleich sein, damit keine Kopplung zwischen ihnen und Energieverluste durch Ausgleichsströme auftreten. Enthält jedoch nur ein Steg, z. B. der Steg I, einen Luftspalt, so sind die Streuinduktivitäten beider Stege nicht mehr gleich, sondern die Streuinduktivität LIS des Steges mit Luftspalt ist kleiner als die Streuinduktivität des Steges ohne Luftspalt. Es wird sich also ein Stromverhältnis zwischen den beiden Erregerströmen il und i2 einstellen Hierbei bezeichnen Klls und KIS die Windungsstreuinduktivitäten der beiden Stege. Im allgemeinen werden Ausgleichsströme auftreten, die den Wirkungsgrad des Ablenksystems herabsetzen und außerdem meist die gewünschte zeitproportionale Änderung des Ablenkfeldes störend beeinflussen. Wählt man jedoch dann treten keine Ausgleichsströme auf, da die im Steg 1 wirksame magnetomotorische Kraft nlil gleich der im Steg II wirksamen magnetomotorischen Kraft n212 wird.If the two webs I and II are designed in the same way, the number of turns n1 and n2 of the two associated excitation coils must be the same so that there is no coupling between them and energy losses due to equalizing currents. Contains only one bridge, e.g. B. the web I, an air gap, the leakage inductances of both webs are no longer the same, but the leakage inductance LIS of the web with air gap is smaller than the leakage inductance of the web without air gap. A current ratio will therefore be established between the two excitation currents i1 and i2 Here, Klls and KIS denote the winding leakage inductances of the two webs. In general, equalizing currents will occur which reduce the efficiency of the deflection system and also usually have a disruptive effect on the desired time-proportional change in the deflection field. One chooses, however then no equalizing currents occur, since the magnetomotive force nlil effective in web 1 becomes equal to the magnetomotive force n212 effective in web II.
Die Streuinduktivität einer Spule wird hierbei definiert durch den Teil des von der betreffenden Spule erzeugten magnetischen Kraftlinienflusses, welcher sich außerhalb des geschlossenen Eisenjoches über dem Luftweg schließt. Die Streuinduktivität kann beispielsweise gemessen werden, indem man den zweiten Steg und die zweite Spule entfernt und die Induktivität mißt. Aus der Streuinduktivität erhält man die Windungsstreuinduktivität, wenn man die gemessene Streuinduktisität durch das Quadrat der Windungszahl dividiert.The leakage inductance of a coil is defined by the Part of the magnetic flux of lines of force generated by the coil in question, which closes outside the closed iron yoke via the airway. The leakage inductance can for example be measured by taking the second land and the second coil removed and the inductance measured. The leakage inductance is obtained from the leakage inductance, if one divides the measured leakage inductance by the square of the number of turns.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF694A DE826039C (en) | 1950-01-28 | 1950-01-28 | Ferromagnetic deflection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF694A DE826039C (en) | 1950-01-28 | 1950-01-28 | Ferromagnetic deflection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE826039C true DE826039C (en) | 1951-12-27 |
Family
ID=7082488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEF694A Expired DE826039C (en) | 1950-01-28 | 1950-01-28 | Ferromagnetic deflection system |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE826039C (en) |
-
1950
- 1950-01-28 DE DEF694A patent/DE826039C/en not_active Expired
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