EP0491215B1 - Deflection unit for a cathode ray tube - Google Patents
Deflection unit for a cathode ray tube Download PDFInfo
- Publication number
- EP0491215B1 EP0491215B1 EP91120688A EP91120688A EP0491215B1 EP 0491215 B1 EP0491215 B1 EP 0491215B1 EP 91120688 A EP91120688 A EP 91120688A EP 91120688 A EP91120688 A EP 91120688A EP 0491215 B1 EP0491215 B1 EP 0491215B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- deflection unit
- tube
- webs
- cathode ray
- ray tube
- 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 - Lifetime
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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
Definitions
- the invention relates to a deflection unit for a cathode ray tube, which has a tube bulb made of a cylindrical tube neck and a part that widens forwardly like a funnel, the shape of the deflection unit corresponding to that of the tube bulb and a cylindrical body being arranged within the deflection unit and oriented parallel to the cylinder axis Has webs.
- a deflection unit of the type mentioned at the outset is known from US-A-3 162 791. Measures to adapt this deflection unit to the tube geometry are not provided.
- the present invention has for its object to provide a deflection unit of the type mentioned, which can be easily adapted to the tube bulb of a cathode ray tube.
- the deflection unit can easily be adapted to a tubular bulb.
- the plastic body magnetically bridges the air gap between the deflection unit and the tube bulb. The deflection field is therefore concentrated on the tube bulb, what improves image sharpness and sensitivity.
- the dimension of the webs in the radial direction of the plastic body is adapted to the distance between the deflection unit and tube piston.
- the bars are easy to manufacture and easy to attach to the plastic body.
- the sharpness of the image and the sensitivity are improved in that the webs are cuboid in the area of the cylindrical part of the deflection unit and wedge-shaped in the area of the funnel-like part.
- the webs then lie flush not only on the tube neck, but also on the funnel-shaped part of the tube piston, so that there is practically no air gap between the deflection unit and the tube piston in the region of the tube neck and the funnel-like part.
- RK denotes the tube bulb of a cathode-ray tube, which consists of a cylindrical tube neck and a part that widens towards the front like a funnel. For simplicity, only the top half of the tube is shown.
- a deflection unit consists of a ferrite core FK and of windings WI, which run in the slots of a coil carrier (not shown here). Such a deflection unit is described in DE-PS 29 40 931 and need not be explained in more detail to become.
- the deflection unit surrounds the tube piston RK. Between the deflection unit and the tube piston RK are arranged around the tube piston RK parallel to the tube axis aligned webs ST made of soft magnetic material, which sit in a plastic body KK.
- the webs ST cause the air gap between the deflection unit and the tubular piston RK to be reduced to a small gap LS.
- a deflection field generated by the deflection unit is thus concentrated on the tube bulb RK, so that the imaging sharpness and the deflection sensitivity of the cathode ray tube are improved.
- FIG. 2 shows the cylindrical plastic body KK, to which the webs ST of soft magnetic material, which are aligned parallel to the axis of the plastic body and concentrically surround it, are attached in the front region.
- the webs ST cuboid in order to achieve good image sharpness and sensitivity.
- the image sharpness and sensitivity are improved if the webs ST are cuboid in the part of the plastic body which surrounds the tube neck of a cathode ray tube, and are wedge-shaped in the part which surrounds the funnel-like part of the tube bulb.
- Figure 3 shows a cross section through the cathode ray tube in the region of the tube neck.
- the section plane A - B for the representation according to FIG. 1 is shown in it.
- the same parts occurring in Figures 1, 2 and 3 are provided with the same reference numerals.
- a practical embodiment shows that the best image sharpness is achieved when the plastic body KK is arranged around the tube bulb RK in such a way that the webs ST lie between the windings WI of the deflection unit.
- the deflection unit can be used for different tube pistons. If the tube neck of a tube bulb has a small diameter, it is necessary to increase the height H of the cuboid-shaped web accordingly.
- the air gap LS between the deflection unit and the tube bulb is reduced and the image sharpness or sensitivity is improved. Accordingly, the Height H of the parallelepipedal web can be reduced if the deflection unit is used for a tube with a larger average of the tube neck.
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Description
Die Erfindung betrifft eine Ablenkeinheit für eine Kathodenstrahlröhre, die einen Röhrenkolben aus einem Zylindrischen Röhrenhals und einem sich nach vorne trichterartig erweiternden Teil aufweist, wobei die Form der Ablenkeinheit der des Röhrenkolbens entspricht und innerhalb der Ablenkeinheit ein zylindrischer Körper angeordnet ist, der parallel zur Zylinderachse ausgerichtete Stege aufweist.The invention relates to a deflection unit for a cathode ray tube, which has a tube bulb made of a cylindrical tube neck and a part that widens forwardly like a funnel, the shape of the deflection unit corresponding to that of the tube bulb and a cylindrical body being arranged within the deflection unit and oriented parallel to the cylinder axis Has webs.
In vielen Bereichen, insbesondere im medizinischen Bereich, werden hohe Anforderungen bezüglich der Abbildungsschärfe eines Bildes auf einem Monitor gestellt. Dazu ist es erforderlich, für die Kathodenstrahlröhre des Monitors eine Ablenkeinheit vorzusehen, die an die Röhrengeometrie angepaßt ist. Liegt die Ablenkeinheit dicht am Röhrenkolben an, so bewirkt dies eine gute Abbildungsschärfe und eine hohe Empfindlichkeit, was eine wirkungsvolle Ablenkung des Elektronenstrahls durch die Ablenkeinheit bedeutet. Bei einer Änderung der Röhrengeometrie muß daher eine neue Ablenkeinheit konstruiert werden, um eine gute Abbildungsschärfe und Empfindlichkeit zu erzielen.In many areas, in particular in the medical field, high demands are made with regard to the image sharpness of an image on a monitor. For this purpose, it is necessary to provide a deflection unit for the cathode ray tube of the monitor, which is adapted to the tube geometry. If the deflection unit lies close to the tube bulb, this results in good image sharpness and high sensitivity, which means an effective deflection of the electron beam by the deflection unit. If the tube geometry changes, a new deflection unit must therefore be constructed in order to achieve good image sharpness and sensitivity.
Eine Ablenkeinheit der eingangs genannten Art ist aus der US-A- 3 162 791 bekannt. Maßnahmen zur Anpassung dieser Ablenkeinheit an die Röhrengeometrie sind nicht vorgesehen.A deflection unit of the type mentioned at the outset is known from US-A-3 162 791. Measures to adapt this deflection unit to the tube geometry are not provided.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Ablenkeinheit der eingangs genannten Art zu schaffen, die an den Röhrenkolben einer Kathodenstrahlröhre leicht angepaßt werden kann.The present invention has for its object to provide a deflection unit of the type mentioned, which can be easily adapted to the tube bulb of a cathode ray tube.
Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Maßnahmen gelöst. Dadurch, daß der zylindrische Körper aus Kunststoff ist, und die Stege austauschbar sind, kann die Ablenkeinheit an einen Röhrenkolben leicht angepaßt werden. Der Kunstoffkörper überbrückt magnetisch den Luftspalt zwischen der Ablenkeinheit und dem Röhrenkolben. Das Ablenkfeld wird daher auf den Röhrenkolben konzentriert, was eine Verbesserung der Abbildungsschärfe und Empfindlichkeit bewirkt.This object is achieved by the measures specified in the characterizing part of claim 1. Because the cylindrical body is made of plastic and the webs are interchangeable, the deflection unit can easily be adapted to a tubular bulb. The plastic body magnetically bridges the air gap between the deflection unit and the tube bulb. The deflection field is therefore concentrated on the tube bulb, what improves image sharpness and sensitivity.
Damit die Ablenkeinheit für Röhrenkolben mit unterschiedlichem Durchmesser eingesetzt werden kann, wird die Abmessung der Stege in radialer Richtung des Kunststoffkörpers an den Abstand zwischen Ablenkeinheit und Röhrenkolben angepaßt. Die Stege sind leicht herzustellen und einfach am Kunststoffkörper zu befestigen.So that the deflection unit can be used for tube pistons with different diameters, the dimension of the webs in the radial direction of the plastic body is adapted to the distance between the deflection unit and tube piston. The bars are easy to manufacture and easy to attach to the plastic body.
In einer Ausgestaltung der Erfindung wird die Abbildungsschärfe und die Empfindlichkeit dadurch verbessert, daß die Stege im Bereich des zylindrischen Teils der Ablenkeinheit quaderförmig und im Bereich des trichterartig erweiterten Teils keilförmig ausgebildet sind. Die Stege liegen dann nicht nur am Röhrenhals, sondern auch am trichterförmigen Teil des Röhrenkolbens bündig an, so daß praktisch kein Luftspalt zwischen der Ablenkeinheit und den Röhrenkolben im Bereich des Röhrenhalses und des trichterartig erweiterten Teils besteht.In one embodiment of the invention, the sharpness of the image and the sensitivity are improved in that the webs are cuboid in the area of the cylindrical part of the deflection unit and wedge-shaped in the area of the funnel-like part. The webs then lie flush not only on the tube neck, but also on the funnel-shaped part of the tube piston, so that there is practically no air gap between the deflection unit and the tube piston in the region of the tube neck and the funnel-like part.
Anhand der Zeichnung wird ein Ausführungsbeispiel der Erfindung näher verdeutlicht.An exemplary embodiment of the invention is illustrated in more detail with the aid of the drawing.
Es zeigen
- Figur 1
- einen Längsschnitt durch eine Kathodenstrahlröhre,
- Figur 2
- einen zylindrischen Kunststoffkörper und
- Figur 3
- einen Querschnitt durch die Kathodenstrahlröhre im Bereich des Röhrenhalses.
- Figure 1
- a longitudinal section through a cathode ray tube,
- Figure 2
- a cylindrical plastic body and
- Figure 3
- a cross section through the cathode ray tube in the region of the tube neck.
In Figur 1 ist mit RK der Röhrenkolben einer Kathodenstrahlröhre bezeichnet, der aus einem zylindrischen Röhrenhals und einem sich nach vorne trichterartig erweiternden Teil besteht. Zur Vereinfachung ist nur die obere Hälfte der Röhre dargestellt. Eine Ablenkeinheit besteht aus einem Ferrit-Kern FK und aus Wicklungen WI, die in hier nicht dargestellten Nuten eines Spulenträgers verlaufen. Eine solche Ablenkeinheit ist in der DE-PS 29 40 931 beschrieben und braucht nicht näher erläutert zu werden. Die Ablenkeinheit umgibt den Röhrenkolben RK. Zwischen der Ablenkeinheit und dem Röhrenkolben RK sind rings um den Röhrenkolben RK parallel zur Röhrenachse ausgerichtete Stege ST aus weichmagnetischem Material angeordnet, die in einem Kunststoffkörper KK sitzen. Die Stege ST bewirken, daß der Luftspalt zwischen der Ablenkeinheit und dem Röhrenkolben RK auf einen kleinen Spalt LS verringert ist. Ein von der Ablenkeinheit erzeugtes Ablenkfeld ist somit auf den Röhrenkolben RK konzentriert, so daß die Abbildungsschärfe und die Ablenkempfindlichkeit der Kathodenstrahlröhre verbessert sind.In FIG. 1, RK denotes the tube bulb of a cathode-ray tube, which consists of a cylindrical tube neck and a part that widens towards the front like a funnel. For simplicity, only the top half of the tube is shown. A deflection unit consists of a ferrite core FK and of windings WI, which run in the slots of a coil carrier (not shown here). Such a deflection unit is described in DE-PS 29 40 931 and need not be explained in more detail to become. The deflection unit surrounds the tube piston RK. Between the deflection unit and the tube piston RK are arranged around the tube piston RK parallel to the tube axis aligned webs ST made of soft magnetic material, which sit in a plastic body KK. The webs ST cause the air gap between the deflection unit and the tubular piston RK to be reduced to a small gap LS. A deflection field generated by the deflection unit is thus concentrated on the tube bulb RK, so that the imaging sharpness and the deflection sensitivity of the cathode ray tube are improved.
Figur 2 zeigt den zylindrischen Kunststoffkörper KK, an dem im vorderen Bereich die parallel zur Achse des Kunststoffkörpers ausgerichteten und diesen konzentrisch umgebenden Stege ST aus weichmagnetischem Material angebracht sind. Im allgemeinen reicht es aus, die Stege ST quaderförmig auszubilden, um eine gute Abbildungsschärfe und Empfindlichkeit zu erzielen. Die Abbildungsschärfe und Empfindlichkeit werden verbessert, falls die Stege ST in dem Teil des Kunststoffkörpers quaderförmig sind, der den Röhrenhals einer Kathodenstrahlröhre umgibt, und in dem Teil keilförmig ausgebildet sind, der den trichterartig erweiterten Teil des Röhrenkolbens umschließt.FIG. 2 shows the cylindrical plastic body KK, to which the webs ST of soft magnetic material, which are aligned parallel to the axis of the plastic body and concentrically surround it, are attached in the front region. In general, it is sufficient to make the webs ST cuboid in order to achieve good image sharpness and sensitivity. The image sharpness and sensitivity are improved if the webs ST are cuboid in the part of the plastic body which surrounds the tube neck of a cathode ray tube, and are wedge-shaped in the part which surrounds the funnel-like part of the tube bulb.
Figur 3 zeigt einen Querschnitt durch die Kathodenstrahlröhre im Bereich des Röhrenhalses. In ihr ist die Schnittebene A - B für die Darstellung nach Figur 1 eingezeichnet. Die in den Figuren 1, 2 und 3 vorkommenden gleichen Teile sind mit gleichen Bezugszeichen versehen. In einem praktischen Ausführungsbeispiel zeigt sich, daß die beste Abbildungsschärfe dann erreicht wird, wenn der Kunststoffkörper KK derart um den Röhrenkolben RK angeordnet wird, daß die Stege ST zwischen den Wicklungen WI der Ablenkeinheit liegen. Die Ablenkeinheit kann für verschiedene Röhrenkolben eingesetzt werden. Weist der Röhrenhals eines Röhrenkolbens einen geringen Durchmesser auf, so ist es erforderlich, die Höhe H des quaderförmigen Steges entsprechend zu vergrößern. Dadurch wird der Luftspalt LS zwischen der Ablenkeinheit und dem Röhrenkolben verringert und die Abbildungsschärfe bzw. Empfindlichkeit verbessert. Entsprechend muß die Höhe H des quaderförmigen Steges verkleinert werden, wenn die Ablenkeinheit für eine Röhre mit größerem Durchschnitt des Röhrenhalses eingesetzt wird.Figure 3 shows a cross section through the cathode ray tube in the region of the tube neck. The section plane A - B for the representation according to FIG. 1 is shown in it. The same parts occurring in Figures 1, 2 and 3 are provided with the same reference numerals. A practical embodiment shows that the best image sharpness is achieved when the plastic body KK is arranged around the tube bulb RK in such a way that the webs ST lie between the windings WI of the deflection unit. The deflection unit can be used for different tube pistons. If the tube neck of a tube bulb has a small diameter, it is necessary to increase the height H of the cuboid-shaped web accordingly. As a result, the air gap LS between the deflection unit and the tube bulb is reduced and the image sharpness or sensitivity is improved. Accordingly, the Height H of the parallelepipedal web can be reduced if the deflection unit is used for a tube with a larger average of the tube neck.
Claims (3)
- A deflection unit for a cathode ray tube, which comprises a tube bulb (RK) formed by a cylindrical tube neck and a part widening in the manner of a funnel towards the front, the shape of the deflection unit corresponding to that of the tube bulb (RK) and a cylindrical element (KK) being arranged within the deflection unit, which cylindrical element comprises webs (ST) made of soft magnetic material and extending parallel to the cylinder axis, characterised in that the element (KK) is made of plastics material and the webs (ST) are replaceable.
- A deflection unit according to claim 1, characterised in that the webs (ST) are cuboid in shape.
- A deflection unit according to claim 1, characterised in that the webs (ST) are cuboid in the region of the cylindrical part of the deflection unit and are wedge-shaped in the region of the part widening in the manner of a funnel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4040698 | 1990-12-19 | ||
| DE4040698A DE4040698A1 (en) | 1990-12-19 | 1990-12-19 | DISTRIBUTION UNIT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0491215A1 EP0491215A1 (en) | 1992-06-24 |
| EP0491215B1 true EP0491215B1 (en) | 1995-07-05 |
Family
ID=6420751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91120688A Expired - Lifetime EP0491215B1 (en) | 1990-12-19 | 1991-12-02 | Deflection unit for a cathode ray tube |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0491215B1 (en) |
| DE (2) | DE4040698A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7584846B2 (en) | 2007-12-21 | 2009-09-08 | S.C. Johnson & Son, Inc. | Shaped packaging for a refill |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR831550A (en) * | 1937-01-02 | 1938-09-07 | Hazeltine Corp | Devices for deflecting the electron beam of a cathode ray tube |
| US3162791A (en) * | 1963-02-05 | 1964-12-22 | Gen Instrument Corp | Width controlling means for cathode ray tube displays |
| NL8303238A (en) * | 1983-09-21 | 1985-04-16 | Philips Nv | ELECTROMAGNETIC DEFLECTOR AND COLOR IMAGE TUBE PROVIDED THEREOF. |
-
1990
- 1990-12-19 DE DE4040698A patent/DE4040698A1/en not_active Withdrawn
-
1991
- 1991-12-02 EP EP91120688A patent/EP0491215B1/en not_active Expired - Lifetime
- 1991-12-02 DE DE59105929T patent/DE59105929D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0491215A1 (en) | 1992-06-24 |
| DE4040698A1 (en) | 1992-06-25 |
| DE59105929D1 (en) | 1995-08-10 |
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