DE2014993C

DE2014993C - Color picture tube

Info

Publication number: DE2014993C
Authority: DE
Inventors: Willi 7900 Ulm; Seifert Helmut Dipl.-Ing. 7911 Ay Schröder
Original assignee: Licentia Patent Verwaltungs GmbH
Current assignee: Licentia Patent Verwaltungs GmbH
Publication date: 1972-09-14

Description

Zur mechanischen Halterung dieser Bleche kann es vorteilhaft sein, sie mit der ebenfalls aus Eisenblech oder -draht bestehenden Armierung gegen Implosionsschutz zu verbinden, z. B. zu verschrauben, zu vernieten, zu verschweißen oder zu vergießen. Andererseits kann es auch von Vorteil sein, die Befestigung lösbar zu gestalten und/oder eine Halterung aus isolierendem Material vorzusehen.To mechanically hold these sheets, it can be advantageous to use them with the sheet iron or wire to connect existing armouring against implosion protection, e.g. B. to screw, riveted, welded or potted. On the other hand, it can also be advantageous to use the fastening to make detachable and / or to provide a holder made of insulating material.

An der Seite des Röhrenhalses können diese Bleche mittels Spannfedern gehalten werden, die sie in Richtung zum Kolben ziehen.On the side of the tube neck, these sheets can be held by means of tension springs, which they pull towards the piston.

Es empfiehlt sich weiterhin, diese Bleche, vorzugsweise auf ihrer Innenseite, zu schwärzen, um damit die Wärmestrahlung des Röhrenkolbens weitgehend zu absorbieren.It is also advisable to blacken these sheets, preferably on their inside, so that they can be used to absorb the heat radiation of the tube piston to a large extent.

Bine mechanische Anpassung an die Kolbenform erreicht man dann, wenn man die Bleche entsprechend der Kolbenform wölbtA mechanical adaptation to the shape of the piston can be achieved if the metal sheets are adjusted accordingly the shape of the piston bulges

Die Erregung dieser ferromagnetischen Teile erfolgt naturgemäß in gleicher Weise mit Erreger- ao spulen. Diese Erregerspulen können entweder nur den Röhrenkolben und/oder die Bleche umschließen. Man kann aber auch Erregerspulen vorsehen, die als Schleifen zwischen dem Röhrenkolben und den Blechen untergebracht sind und so verlaufen, daß ein as Teil jeder Spule zwischen Kolben und Blech und ein anderer Teil außerhalb des Bleches liegt, so daß das Blech als Kern der Spule wirkt.The excitation of these ferromagnetic parts takes place of course, coil with exciter ao in the same way. These excitation coils can either only enclose the tubular flask and / or the metal sheets. But you can also provide excitation coils as Loops are housed between the tubular piston and the metal sheets and run in such a way that an as Part of each coil lies between the piston and the sheet metal and another part is outside the sheet metal, so that the Sheet metal acts as the core of the coil.

Ausführungsbeispiele der Erfindung sind in der Zeichnung in den F i g. 2 bis 5 dargestellt.Embodiments of the invention are shown in the drawing in FIGS. 2 to 5 shown.

F i g. 2 zeigt eine Rückansicht der Farbbildröhre 1 in Richtung zum Schirm, Fig. 3 eine Seitenansicht dieser Röhre und Fig. 4 eine gegenüber Fig. 3 um 90° gedrehte SeitenansichtF i g. 2 shows a rear view of the color picture tube 1 in the direction of the screen, FIG. 3 shows a side view of this tube and FIG. 4 one opposite FIG. 3 90 ° rotated side view

In den Kolben dieser Farbbildröhre 1 ist eine Haube 7 aus ferromagnetischem Material eingebracht, bevor die Frontscheibe aufgeschmolzen worden ist. Auf zwei einander gegenüberliegenden Außenseiten der Röhre sind ebenfalls aus ferromagnetischem Material bestehende Bleche 4 aufgebracht, die in dem Ausführungsbeispiel unmittelbar mit der Armierung 3 verbunden, z. B. verschraubt, sind. Zur Erregung der ferromagnetischen Teile 4 und 7 ist eine den Röhrenkolben umschließende Spule 6 vorgesehen. Ferner sind weitere Spulen S um die Bleche 4 gewickelt, die im Falle der Erregung zusammen mit der Spule 6 ein Entmagnetisierungsfeld aufbauen.A hood 7 made of ferromagnetic material is inserted into the piston of this color picture tube 1, before the windshield has been melted. On two opposite sides The tube are also made of ferromagnetic material sheets 4 applied, which in the Embodiment directly connected to the reinforcement 3, for. B. screwed, are. To arousal of the ferromagnetic parts 4 and 7, a coil 6 surrounding the tubular piston is provided. Furthermore, further coils S are wound around the metal sheets 4, which together in the event of excitation build up a demagnetizing field with the coil 6.

In F i g. 5, welche im wesentlichen der Darstellung gemäß Fig. 3 entspricht, ist eine weitere Ausführungsform dargestellt, die sich von der Anordnung nach Fig. 3 dadurch unterscheidet, daß zwei Entmagnetisierungsspulen 8 vorgesehen sind, welche in den Zwischenraum zwischen den Blechen 4 und den Röhrenkolben eingebracht sind. Diese Ausführungsform bietet den Vorteil der besonderen Einfachheit. In Fig. 5, which essentially corresponds to the illustration according to FIG. 3, is a further embodiment shown, which differs from the arrangement of FIG. 3 in that two degaussing coils 8 are provided, which are introduced into the space between the metal sheets 4 and the tubular piston. This embodiment offers the advantage of particular simplicity.

Es sei abschließend erwähnt, daß man an den Blechen 4 Lappen, z. B. durch Ausklinkung, herstellen kann, die dann zur Befestigung der Erregerspulen benutzt werden können.Finally, it should be mentioned that 4 lobes, z. B. by notching can, which can then be used to attach the excitation coils.

Zur Erzielung guter magnetischer Eigenschaften sollten die Bleche einem Glühprozeß unterworfen werden. Es kann auch zweckmäßig sein, die Bleche aus einem SpezialStahl sehr niedrigen Kohlenstoff-Gehalts (< 0,01%) herzustellen.To achieve good magnetic properties, the sheets should be subjected to an annealing process will. It can also be useful to make the sheets from a special steel with a very low carbon content (<0.01%).

Wenngleich die Erfindung im wesentlichen darin gesehen wird, daß die Bleche 4 unmittelbar am Röhrenkolben befestigt sind, so ist es doch auch möglich, sie im Gerätegehäuse so zu befestigen, daß sie nach der Montage der Bildröhre einen nur geringen Abstand zum Implosionsschutzrahmen der Bildröhre aufweisen.Although the invention is essentially seen in the fact that the metal sheets 4 are located directly on the tubular piston are attached, it is also possible to attach them in the device housing so that they after the assembly of the picture tube only a small distance to the implosion protection frame of the picture tube exhibit.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

To suppress as far as possible, it is known to surround color claims: picture tubes with hoods made of ferromagnetic material, e.g. sheet iron, as shown in Fig. 1

1. Color picture tube with one of a ferro- the drawing is shown. The tube is in this one magnetic hood and corresponding Erre- 5 drawing denoted by 1; around her butt gerspulen existing demagnetization unit. a hood 2 made of such a ferromagnetic material direction to compensate for the earth's field, placed there, in which in turn demagnetization through marked that this hood are inserted coils. This demagnetization (7) is arranged in the tube interior and coils is a decaying alternating current zugedaß the magnetic return resistance of the io leads, so that with a prevailing magnetic Hood (7) built up a magnetic field in the hood by one or more of the external constant field The sheet metal (4) attached to the piston wall is made of ferro- whose leakage flux in the interior of the tube is dem magnetic material is reduced. The interference field is directed in the opposite direction. It arises there-

2. Color picture tube according to claim I ₁ characterized by an almost field-free space and it is characterized that in a square tube two avoided that the EleküOnenstrahl on them sheets (4) are attached to their narrow sides. hit unassigned phosphor points.

3. Color picture tube according to claim 1 and 2, there- for various reasons, it is now expedient characterized in that these sheets (4) with moderate, this hood made of ferromagnetic material one also made of sheet iron or iron wire to be laid inside the tubular piston. To the standing armouring (3) for implosion protection 20 example is achieved with the fact that the magnetic connected, e.g. B. screwed, riveted, flow is better coupled into the shadow mask, welded or cast. so that, especially with the picture tube with 110 ° -ab-

4. Color picture tube according to claim 1 and 2, steering, the more prominent Landurch characterized in that the sheets (4) with movement displacement through the axial components of the a magnetic earth field, also made of sheet iron or iron wire, is reduced. These inside Reinforcement (3) for protection against implosion forms the hood that is lying with the perforated mask are isolated and easily detachable. together form a closed magnetically

5. Color picture tube according to claim 1 to 4, screened room.

characterized in that these sheets (4) are The arranging of a ferrometallic hood

the side of the tube neck by means of tension springs 30-like shielding within the tube piston

are held, which it is known in the direction of the piston of a picture tube. With such a

draw. Of course, you could also have a tube on the outside

6. color picture tube according to claim 1 to 5, da- hood made of ferromagnetic material with the characterized in that the metal sheets (4) provide conventional degaussing coils to the preferably on its inside, demagnetization of the tube interior required for absorption 35 To achieve thermal radiation of the tube piston space. The cost of blackened out are. use of two drawn hoods would be

7. Color picture tube according to claim 1 to 6, too large.

characterized in that the metal sheets (4) for- Finally, one could use tubes with an in

aiming at a mechanical adaptation to the 40 ferromagnetic hoods laid inside the tube

Piston shape are curved accordingly. table material with the usual externally applied

8. Color picture tube according to claim 1 to 7, characterized by or with a coil enclosing the beam that they work arrangement excitation coils (5,6). The demagnetization required, which would either only enclose the tubular piston, however, would in this case enclose high AW and / or the metal sheets (4). 45 numbers and thus a high level of circuit complexity

9. color picture tube according to claim 1 to 7, da- require. For example, it would be a bigger one characterized in that they have excitation coils (8) copper cross-section of the winding and a larger one has, as loops between the tube current consumption from the network when switching on the piston (1) and the metal sheets (4) housed device required.

are, so that a part of each coil between KoI- 50 The invention is based on the object that ben and sheet metal and another part outside advantageous accommodation of the degaussing des Sheet metal lies. hood into the tube interior with such a

Combine degaussing arrangement that on the one hand an almost complete compensation of the

55 magnetic earth field is achieved and on the other hand the necessary costs in affordable The limits remain.

To solve this problem, according to the

The invention relates to a color picture tube with a proposed invention that this hood in the consists of a ferromagnetic hood and a corresponding tube interior is arranged and that the magneden Excitation coils existing demagnetizing tables with a short-circuit resistance of the hood Device to compensate for the magnetic earth field or several fields applied to the outer bulb wall. brought sheets of ferromagnetic material

Undesirable effects of magnetic fields on the ringert is.

Electron beams from color picture tubes, e.g. B. Die- 65 With a square tube one uses a purpose one of the earth's field, lead to mislanding of the moderately two sheets, those on two opposite one another Electron beams on the screen of the tube sides of the piston, e.g. B. on the two narrow sides, and thus color impurities. To these influences are appropriate.