DE933466C - Arrangement for further linearization of the almost saw-tooth-shaped deflection field in the deflection coils of a cathode ray tube, in particular a television picture tube - Google Patents
Arrangement for further linearization of the almost saw-tooth-shaped deflection field in the deflection coils of a cathode ray tube, in particular a television picture tubeInfo
- Publication number
- DE933466C DE933466C DEL3858A DEL0003858A DE933466C DE 933466 C DE933466 C DE 933466C DE L3858 A DEL3858 A DE L3858A DE L0003858 A DEL0003858 A DE L0003858A DE 933466 C DE933466 C DE 933466C
- Authority
- DE
- Germany
- Prior art keywords
- deflection
- field
- tube
- arrangement
- cathode ray
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/90—Linearisation of ramp; Synchronisation of pulses
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Description
Bei Braunschen Röhren, insbesondere Fernsehröhren, verwendet man zur Zeitablenkung des Kathodenstrahls ein Ablenkspulensystem, welches von einem sägezahnförmigen Strom durchflossen wird. Dieser sägezahnförmige Strom erzeugt in der Spule ein sägezahnförmig verlaufendes Feld, welches den Elektronenstrahl zeitproportional ablenkt. With Braun tubes, especially television tubes, the Cathode ray a deflection coil system through which a sawtooth-shaped current flows will. This sawtooth-shaped current generates a sawtooth-shaped field in the coil, which deflects the electron beam proportionally to time.
Wie bekannt ist, bereitet die Erzeugung linear ίο sägezahnförmig verlaufender Ströme gewisse Schwierigkeiten. Die Krümmung der sägezahnförmig verlaufenden Ablenkströme ist zurückzuführen auf die unvermeidlichen Verlustwiderstände. Es sind verschiedene Schaltungen bekannt, um dem durch die Ablenkspulen fließenden Strom einen möglichst geradlinigen sägezahnförmigen Verlauf zu geben. Alle diese Schaltungen verhindern jedoch nicht, daß das Ablenkfeld in den Ablenkspulen nach wie vor etwas exponentiell ansteigt. As is known, the generation of linear ίο sawtooth-shaped currents prepares certain currents Trouble. The curvature of the sawtooth-shaped deflection currents can be traced back on the inevitable loss resistances. Various circuits are known in order to keep the current flowing through the deflection coils as straight as possible in the shape of a sawtooth To give course. However, all of these circuits do not prevent the deflection field in the deflection coils continues to increase somewhat exponentially.
Die Erfindung betrifft eine Anordnung zur weiteren Linearisierung des trotz aller vorhergegangenen Linearisierungsmaßnahmen immer noch etwas exponentiell ansteigenden Ablenkfeldes in den Ablenkspulen einer Kathodenstrahlröhre, insbesondere einer Fernsehbildröhre.The invention relates to an arrangement for the further linearization of the despite all of the preceding Linearization measures still somewhat exponentially increasing deflection field in the deflection coils of a cathode ray tube, in particular a television picture tube.
Dies wird gemäß der Erfindung dadurch erreicht, daß zwischen den Ablenkspulen und dem Elektronenstrahl im Wege der ablenkenden Feldlinien mindestens ein den Strahl umschlingender Wirbelstromzylinder vorgesehen ist, der so ausgebildet ist, daß die in ihm erzeugten Wirbelströme dem Ablenkfeld so entgegenwirken, daß die gewünschte Linearisierung erreicht wird.This is achieved according to the invention in that between the deflection coils and the electron beam by means of the deflecting field lines, at least one eddy current cylinder wrapping around the beam is provided, which is designed so that the eddy currents generated in it the deflection field counteract this so that the desired linearization is achieved.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindnug dargestellt.In the drawing, an embodiment of the invention is shown.
Fig. ι zeigt Kurven, die zur Erläuterung der Erfindung dienen;Fig. Ι shows curves used to explain the invention to serve;
Fig. 2 zeigt schematisch eine Braunsche Röhre mit Ablenkspule und Wirbelstromzylinder.Fig. 2 shows schematically a Braun tube with deflection coil and eddy current cylinder.
In Fig. ι ist in Abhängigkeit von der Zeit der Feldverlauf innerhalb der Ablenkspulen dargestellt. Kurve A zeigt in aus Darstellungsgründen übertriebener Weise, daß der Feldverlauf zwischen den Zeitpunkten t± und t3 keineswegs linear ansteigt, sondern exponentiell verläuft, d. h. daß die -Ablenkgeschwindigkeit zwischen ti und t2 größer ist als zwischen t2 und i3.In Fig. Ι the field course within the deflection coils is shown as a function of time. Curve A shows, in an exaggerated manner for the sake of illustration, that the field profile does not increase linearly between times t ± and t 3 , but runs exponentially, that is, the deflection speed between t i and t 2 is greater than between t 2 and i 3 .
Gemäß der Erfindung läßt sich dieser exponentielle Feldanstieg dadurch linearisieren, daß zwischen Ablenkspulen und Kathodenstrahl ein Abschirmzylinder vorgesehen wird. Durch den Feldanstieg des Außenfeldes entstehen im Zylinder Wirbelströme, die dem anwachsenden Feld entgegenwirken. Da die Änderung des Feldes nach der Zeit tx besonders groß ist, entstehen zu dieser'Zeit große Wirbelströme, die das Feld schwächen, wie durch die Kurve B angegeben ist. Entsprechend der zwischen den Zeiten t% und i3 weniger schnellen Feldveränderung wird auch die Feldschwächung geringer. Die Stärke des Abschirmzylinders, das verwendete Metall für denselben und die Länge des Abschirmzylinders können nun so gewählt werden, daß eine derartige prozentuale Schwächung des Außenfeldes im Innern des Abschirmzylinders ent·; steht, daß das dort vorhandene Feld einen zeitlichen Verlauf hat, der durch die Kurve B angegeben ist, die praktisch geradlinig verläuft, zumindest aber einen Wendepunkt aufweist. Wie ersichtlich, wird der Feldverlauf linearisiert und der vorher vorhandene Geschwindigkeitsfehler praktisch eliminiert.According to the invention, this exponential field increase can be linearized in that a shielding cylinder is provided between the deflection coils and the cathode beam. The rise in the external field creates eddy currents in the cylinder that counteract the growing field. Since the change in the field after time t x is particularly large, large eddy currents arise at this time, which weaken the field, as indicated by curve B. Corresponding to the less rapid field change between times t% and i 3 , the field weakening is also less. The strength of the shielding cylinder, the metal used for the same and the length of the shielding cylinder can now be selected so that such a percentage weakening of the outer field inside the shielding cylinder ent ·; stands that the field present there has a time course, which is indicated by curve B , which runs practically in a straight line, but at least has a turning point. As can be seen, the field profile is linearized and the previously existing speed error is practically eliminated.
Der Abschirmzylinder wird zweckmäßigerweise aus einer dünnen Metallfolie gebildet, die um den Hals der Braunschen Röhre gelegt oder auf der Innenseite des Spulenkörpers angebracht wird. Als Metalle .eignen sich Kupfer, Messing, Aluminium usw.The shielding cylinder is expediently formed from a thin metal foil that surrounds the Neck of the Braun tube or attached to the inside of the bobbin. as Metals are suitable for copper, brass, aluminum, etc.
Fig. 2 zeigt schematisch eine Ausführungsform der Erfindung. Die Braunsche Röhre ist mit BR und das Ablenkspulensystem mit Sp bezeichnet, und Z stellt den Abschirmzylinder dar.Fig. 2 shows schematically an embodiment of the invention. The Braun tube is labeled BR and the deflection coil system is labeled Sp , and Z represents the shielding cylinder.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL3858A DE933466C (en) | 1950-09-23 | 1950-09-23 | Arrangement for further linearization of the almost saw-tooth-shaped deflection field in the deflection coils of a cathode ray tube, in particular a television picture tube |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL3858A DE933466C (en) | 1950-09-23 | 1950-09-23 | Arrangement for further linearization of the almost saw-tooth-shaped deflection field in the deflection coils of a cathode ray tube, in particular a television picture tube |
| DE293800X | 1950-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE933466C true DE933466C (en) | 1955-09-29 |
Family
ID=6081342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEL3858A Expired DE933466C (en) | 1950-09-23 | 1950-09-23 | Arrangement for further linearization of the almost saw-tooth-shaped deflection field in the deflection coils of a cathode ray tube, in particular a television picture tube |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE505960A (en) |
| CH (1) | CH293800A (en) |
| DE (1) | DE933466C (en) |
| FR (1) | FR63215E (en) |
| GB (1) | GB714770A (en) |
| NL (1) | NL16396C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1126523B (en) * | 1958-06-19 | 1962-03-29 | Siemens Elektrogeraete Gmbh | Arrangement for fastening and centering the magnetic deflection unit on the tube neck of cathode ray tubes |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB522533A (en) * | 1938-12-13 | 1940-06-20 | Kolster Brandes Ltd | Improvements in or relating to cathode ray tubes |
-
0
- BE BE505960D patent/BE505960A/xx unknown
- NL NL16396D patent/NL16396C/xx active
-
1950
- 1950-09-23 DE DEL3858A patent/DE933466C/en not_active Expired
-
1951
- 1951-09-04 CH CH293800D patent/CH293800A/en unknown
- 1951-09-07 GB GB21168/51A patent/GB714770A/en not_active Expired
- 1951-09-21 FR FR63215D patent/FR63215E/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB522533A (en) * | 1938-12-13 | 1940-06-20 | Kolster Brandes Ltd | Improvements in or relating to cathode ray tubes |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1126523B (en) * | 1958-06-19 | 1962-03-29 | Siemens Elektrogeraete Gmbh | Arrangement for fastening and centering the magnetic deflection unit on the tube neck of cathode ray tubes |
Also Published As
| Publication number | Publication date |
|---|---|
| BE505960A (en) | |
| FR63215E (en) | 1955-09-12 |
| NL16396C (en) | |
| GB714770A (en) | 1954-09-01 |
| CH293800A (en) | 1953-10-15 |
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