DE1047314B - Toroidal coil, especially deflection coil for television receivers - Google Patents

Description

GERMAN

The invention relates to toroidal-shaped coils for sliding onto curved, in particular circular coil cores, preferably made of ferrite, in particular for use as deflection coils of television receivers, and a method of making such coils.

It is known that two types of deflection coils are used in modern television receivers; on the one hand the so-called saddle coils, in which each coil consists of two parallel to the beam axis of the television picture tube running longitudinal conductor bundles, the ends of which are bent away from the tube axis Frontal conductor bundles are connected, and on the other hand the so-called toroidal coils, in which a beam enclosing, annular, ferromagnetic yoke is provided around which the turns' of the deflection coil are wrapped. In the latter type to which the invention relates, there is the deflection yoke mostly made up of two or more parts, which are put together and over after application of the winding be pushed down the neck of the television picture tube.

In order to achieve good edge definition of the television picture, it was previously used with deflection units toroidal deflection coils common, the two deflection coils belonging to each deflection coordinate in to divide each two sub-coils, which are then available at the outer edges of each Area were arranged. Deflection coils, which are composed of sub-coils in the manner described are, however, have the disadvantage that the winding height of the individual coils because of the the necessary number of ampere turns due to the copper cross-section is relatively large, which is because of the also increased yoke diameter decreases the sensitivity of the arrangement. Furthermore is it is disadvantageous in such arrangements for the vertical deflection that each of the sub-coils of the is penetrated by the horizontal deflection resulting line flow between the upper and lower Winding layers of each coil section generates a relatively high voltage. With undivided toroidal Vertical deflection coils did not generate this large voltage because of the corresponding voltages Compensate in each position of the winding by the opposite line flux. To reduce from flashovers, a good insulation must therefore be provided for the sub-coils that their Wrap height still increased.

It is therefore desirable in many cases that the toroidal deflection coils extend undivided over the area available to them. Such coils, which in many cases then extend over an angle of 90 ° and more, could only be applied to the core or to the toroidal coil, in particular, in the past
Deflection coil for television receivers

Applicant:

Telefunken GmbH,
Berlin NW 87, Sickingenstr. 71

Friedrich Kratochvil, Hanover-Ricklingen,
has been named as the inventor

Yoke can be applied by wrapping them directly on it. For the series production of

Ao steering units, however, such a method is very cumbersome and therefore requires a lot of time, whereby it becomes relatively expensive. For this reason, in the previous version of the deflection units with toroidal deflection coils accepted the disadvantage of the deflection coils divided into partial coils, which also required a surcharge because of the additional insulation, but on separate, short bobbins could be wound, which then in a simple manner on the yoke were postponed.

The invention shows a coil shape for coils of large winding length, which for a particularly simple Manufacture of the coil is suitable and applied in a simple manner to circular coil cores can be.

A toroidal coil, especially a deflection coil for television receivers, to slide on a curved, preferably circular coil core closely matched to the coil diameter has, according to the invention, the following features, some of which are known per se, in combination:

a) The coil is designed without a coil body;

b) on the inside of the coil corresponding to the smaller diameter there is a flexible one, the turns Adhesive strips to prevent movement are glued on;

c) the adhesive strip consists of a non-shrinking one Material;

d) the tape is longer than the coil winding, and its ends protruding on both sides over the reel edges are in the sense of achieving it a reinforcement of the cohesion of the windings in a way that leads back and glued on.

809 700/438

The invention can be applied to single-layer or multi-layer coils.

Although a toroidal coil is known, the windings of which are lined up in a larger number of Support bodies is wound by a glued into the support body, parallel to the coil axis running band are held together to form a ring. But such a coil needs a lot Space and has gaps, whereby there is between successive winding parts Result in gaps.

It is also known, after completion of a just wound coil, on the outside of one To apply plastic strips, which contracts as it dries, making the coil into one Toroidal coil is deformed, but with such a coil neither the coil length can be exact from the outset the individual windings can still be determined with certainty.

A convenient method of making such a winding is that the winding is wound on a straight bobbin, the cross section of which corresponds to the cross section of the coil core corresponds, which is preferably provided with flanges to determine the winding length and on one side of which the adhesive strip is placed with the adhesive surface facing outwards and after completion of the winding folded over at its ends and glued to the corresponding outer surface of the winding will. For easy separation of the winding from the winding body, this can consist of two parts, whose mutual contact surfaces are a diagonal surface of the straight bobbin. During the In the winding process, these two parts can, for example, be carried out by one passing through both parts Bolts are held together.

To explain the invention in more detail, an exemplary embodiment will be described with reference to the drawings will:

Fig. 1 shows a coil 1, which is on a straight winding core of rectangular cross-section without use a special bobbin or an insulating layer is wound in a self-supporting manner. This The winding core consists of two parts 2 and 3, the abutting surfaces of which form a diagonal surface of the winding core form.

While the coil is being wound, parts 2 and 3 of the winding core are moved by means of a threaded rod 4 or a similar device held together so that the coil in a known manner on the conventional winding machines can be produced. So that the coil 1 after pulling out the core parts 2 and 3 together, an adhesive strip 5 {z. B. from one under the Trade name Tesaband known tape) provided with the adhesive side against the turn and the ends 6 of which are turned over and also glued onto the windings from the outside.

Due to the aforementioned adhesive strip 5, the individual turns of the coil 1 are like this on their inside attached so that they can not move against each other, so that the cross-section of the coil is preserved remain. At the same time, however, this one-sided fastening of the windings allows a rotation against one another of the individual winding surfaces, as this attachment forms a hinge. For this reason the whole coil can be shaped into a circle or an arc of a circle without changing the coil cross-section the inside of which form the winding parts held by the adhesive strip.

FIG. 2 shows such a curved coil 1 with an adhesive strip 5 which is attached to a curved core 7 is slidable. To avoid an electrical flashover between the cantilever wound Coil 1 and the coil core, which is preferably made of ferrite, has a thin insulating layer overdrawn.

ίο When making such coils for curved ones Coil cores can e.g. B. a particularly long formed bobbin can be used on the a larger number of the coils is wound, which then after pulling the Winding cores can be pushed onto curved spool cores.

The invention is not limited to coil cores of rectangular cross-section, for which in the The coil shown in the figure is suitable. Such coils are e.g. B. can be used with picture tubes, their deflection angle 70 °. In the case of picture tubes with a deflection angle of 90 °, however, the coils are often like this shaped so that they enclose not only the tube neck, but also the approach of the tube piston. A The coil core for the vertical deflection coils of such picture tubes will therefore have a more trapezoidal cross-section to have.

Claims (3)

Patent claims: 1. Toroidal coil, especially deflection coil for television receivers, to slide on a curved, preferably circular coil core, closely matched to the coil diameter, characterized by the combination of the following features, some of which are known per se: a) that the coil is designed without a bobbin; b) that on the inside of the coil corresponding to the smaller diameter there is a flexible, adhesive tape securing the windings against displacement is glued on; c) that the adhesive strip consists of a non-shrinking material; d) that the adhesive strip is longer than the coil winding and its both sides over the Coil edges protruding ends over this in order to achieve a strengthening of cohesion of the turns are folded back and glued on. 2. A method for producing a coil according to claim 1, characterized in that the Winding on an elongated, preferably to define the winding length with flanges provided winding body is wound, on one side of which the adhesive strip with the The adhesive surface was placed on the outside, and that the ends of the adhesive strip after the completion of the winding The coil can be folded over and glued to the corresponding outside of the winding. 3. The method according to claim 2, characterized in that that the winding body is designed in a manner known per se so that its cross section can be reduced in size to make it easier to pull off the winding. Considered publications:
German Patent Nos. 475 062, 840 284; U.S. Patent No. 1,592,352. 1 sheet of drawings