EP1620920B1 - Inductive miniature structural element, especially antenna - Google Patents

Abstract

Disclosed is an inductive miniature structural element, particularly an antenna. Said structural element comprises a winding member ( 1 ) which is embodied as a flat component and on which three coil windings ( 2 X, 2 Y, 2 Z) are mounted in such a way that the axes of said coil windings point in the three three-dimensional directions (X, Y, Z). The winding member ( 1 ) is made at least in part of ferrite material while the top face and the bottom face thereof are provided with guiding elements ( 1.5, 1.6, 1.7, 1.8 ) for directing the third coil winding. The winding member ( 1 ) is placed on a coil plate ( 3 ) made of electrically non-conducting, non-ferromagnetic material and is connected thereto. The coil plate ( 3 ) is provided with recesses into which the guiding elements that are located on the bottom face of the winding member ( 1 ) engage. The ends of the first and second coil winding ( 2 X, 2 Y) are wound around the guiding elements located on the bottom face of the winding member, respectively, while the ends of the third coil winding ( 2 Z) are wound around corners or projections of the coil plate ( 3 ), respectively.

Description

The invention relates to an inductive miniature component, in particular an antenna, formed with a flat, rectangular or polygonal component winding body on which three coil windings are applied such that the axes of these coil windings in the three mutually perpendicular spatial directions (X, Y , Z), wherein a first and a second coil winding are wound in two lying perpendicular to each other in the median plane of the bobbin directions of the width and the length of the bobbin around this and the third coil winding along the narrow side of the bobbin its circumference following this wrapped around wherein the winding body is at least partially made of Ferntmaterial and having on an underside guide elements for guiding the third coil winding on one of its sides.

Such components are known in principle (see JP 2003 0925 09 A). They can be used, for example, as antennas in a keyless entry system for motor vehicles or even in radio-transmitting devices using the remote control.

In the previously known components of this type, difficulties arise in the production in that individual steps of the manufacturing process, in particular the application of the third coil winding, must be carried out by hand.

The invention has the object of providing an inductive miniature device, in particular an antenna, with the features described above in such a way that a fully automatic, inexpensive production is possible, but in which a secure fit of the third coil winding is guaranteed.

• a) Der Wickelkörper besitzt an seiner Oberseite Führungselemente zur Führung der dritten Spulenwicklung an ihrer anderen Seite;
• b) die Führungselemente an der Oberseite des Wickelkörpers bestehen aus Ferritmaterial und sind einstückig mit dem aus Ferritmaterial bestehenden Wickelkörper verbunden;
• c) der Wickelkörper ist auf eine Spulenplatte aus elektrisch nicht leitendem, nicht ferromagnetischem Material aufgesetzt und mit dieser verbunden,
• d) die Spulenplatte weist sich über ihre Dicke erstreckende Ausnehmungen auf, deren Innenkontur und Anordnung der Außenkontur und Anordnung der an der Unterseite des Wickelkörpers angeordneten Führungselemente entspricht, und der Wickelkörper ist derart auf die Spulenplatte aufgesetzt, dass die an seiner Unterseite angeordneten Führungselemente in die Ausnehmungen der Spulenplatte eingreifen;
• e) die Wicklungsenden der ersten und zweiten Spulenwicklung sind jeweils um die an der Unterseite des Wickelkörpers angeordneten Führungselemente gewickelt;
• f) die Wicklungsenden der dritten Spulenwicklung sind jeweils um die Ecken oder Vorsprünge der Spulenplatte gewickelt.

The solution of this object is achieved according to the invention, as indicated in the characterizing part of patent claim 1, by the following features:

• a) The winding body has on its upper side guide elements for guiding the third coil winding on its other side;
• b) the guide elements on the top of the winding body are made of ferrite material and are integrally connected to the winding body consisting of ferrite material;
• c) the winding body is placed on a coil plate made of electrically non-conductive, non-ferromagnetic material and connected thereto,
• d) the coil plate has over its thickness extending recesses whose inner contour and arrangement of the outer contour and arrangement of arranged on the underside of the winding body guide elements corresponds, and the winding body is placed on the coil plate such that the arranged on its underside guide elements in the Recesses of the coil plate engage;
• e) the winding ends of the first and second coil windings are respectively wound around the arranged on the underside of the winding body guide elements;
• f) the winding ends of the third coil winding are respectively wound around the corners or projections of the coil plate.

Advantageous developments of the device according to the invention are described below and in the dependent device claims. Methods for the automatic production of the device according to the invention are described in the method claims.

A basic idea of the invention is basically to construct the component from two parts, namely once the winding body, which carries all three coil windings and which in a particularly advantageous embodiment can consist entirely of ferrite material, and, on the other hand, a coil plate of electrically non-conductive non-ferromagnetic material , For example, plastic, on which the bobbin is mounted such that the arranged on its underside guide elements engage in correspondingly configured recesses of the coil plate. At this time, the coil ends of the first and second coil windings are wound around the guide members on the lower side of the bobbin, and the coil ends of the third coil winding, which is applied only when the bobbin is mounted on the coil plate, are respectively wound around corners or projections of the coil plate , The inner edges of the recesses of the coil plate and adjoining portions at the bottom of the coil plate may have a metallic coating. Likewise, the corners or protrusions of the coil plate about which the coil ends of the third coil winding are wound and portions adjacent thereto at the bottom of the coil plate may have a metallic coating. In this way, connection contacts are provided on the underside of the coil plate, with which the winding ends of the coil windings can be connected by soldering, so that they can be placed directly on a correspondingly equipped circuit board and fastened there.

As described below on the basis of exemplary embodiments, the inductive miniature component according to the invention can be produced quickly and inexpensively on appropriately equipped machines.

In the following, embodiments of inductive miniature components according to the invention and for methods for their preparation will be explained in more detail with reference to the accompanying drawings.

Fig. 1

in einer Ansicht auf die Oberseite ein induktives Miniatur-Bauelement in einer Ausbildung als 3D-Antenne;

Fig. 2

das Bauelement nach Fig. 1 in einer Ansicht auf die Unterseite;

Fig. 3.

das Bauelement nach Fig. 1 und 2 in einer Ansicht auf die Schmalseite;

Fig. 4

die Spulenplatte für das Bauelement nach Fig. 1 bis 3 in einer Ansicht auf die Oberseite;

Fig. 5

die Spulenplatte nach Fig. 4 in einer Ansicht auf die Unterseite;

Fig. 6

den Wickelkörper des Bauelements nach Fig. 1 bis 3 in einer Ansicht auf die Unterseite;

Fig. 7

den Wickelkörper nach Fig. 6 in einer Ansicht auf die Oberseite;

Fig. 8

den Wickelkörper nach Fig. 6 und 7 in einer Ansicht auf die Schmalseite;

Fig. 9

eine andere Ausführungsform eines Wickelkörpers für ein Bauelement nach Fig. 1 bis 3 in einer teilweise nach der Linie IX-IX in Fig. 11 geschnittenen Seitenansicht;

Fig. 10

den Wickelkörper nach Fig. 9 in einer teilweise nach der Linie X-X geschnittenen Seitenansicht;

Fig. 11

den Wickelkörper nach Fig. 9 und 10 in einer Ansicht von unten;

Fig. 12

ein Führungselemente tragendes Kunststoffteil zur Befestigung am Wickelkörper nach Fig. 9 bis 11 in einer Ansicht auf die Breitseite;

Fig. 13

das Kunststoffteil nach Fig. 12 in einer Ansicht von oben;

Fig. 14

das Kunststoffteil nach Fig. 12 und 13 in einer Ansicht von unten;

Fig. 15

das Kunststoffteil nach Fig. 12 bis 14 in einer Ansicht auf die Schmalseite;

Fig. 16

eine andere Ausführungsform einer Spulenplatte in einer Ansicht von oben;

Fig. 17

die Spulenplatte nach Fig. 16 in einer Ansicht von unten;

Fig. 18

in einer perspektivischen explodierten Darstellung Wickelkörper und Spulenplatte nach Fig. 4 bis 8 ohne die Spulenwicklungen;

Fig. 19A bis 19E

das Bauelement nach Fig. 1 bis 8 in verschiedenen Phasen seiner Herstellung.

In the drawings show:

Fig. 1

in a view on top of a miniature inductive device in a training as a 3D antenna;

Fig. 2

the component of Figure 1 in a view of the underside.

Fig. 3.

the component of Figure 1 and 2 in a view on the narrow side.

Fig. 4

the coil plate for the device of Figure 1 to 3 in a view of the top.

Fig. 5

the coil plate of Figure 4 in a view of the underside.

Fig. 6

the winding body of the device of Figure 1 to 3 in a view of the underside.

Fig. 7

the winding body of Figure 6 in a view on the top.

Fig. 8

the winding body of Figure 6 and 7 in a view on the narrow side.

Fig. 9

another embodiment of a winding body for a device according to Figures 1 to 3 in a partially sectioned along the line IX-IX in Figure 11 side view.

Fig. 10

the winding body of Figure 9 in a partially sectioned along the line XX side view.

Fig. 11

the winding body of Figure 9 and 10 in a view from below.

Fig. 12

a guide elements supporting plastic part for attachment to the winding body of Figure 9 to 11 in a view of the broadside.

Fig. 13

the plastic part of Figure 12 in a view from above.

Fig. 14

the plastic part of Figure 12 and 13 in a view from below.

Fig. 15

the plastic part of Figure 12 to 14 in a view on the narrow side.

Fig. 16

another embodiment of a coil plate in a top view;

Fig. 17

the coil plate of Figure 16 in a view from below.

Fig. 18

in a perspective exploded view winding body and coil plate of Figure 4 to 8 without the coil windings.

Figs. 19A to 19E

the component of Fig. 1 to 8 in different phases of its production.

The inductive miniature component shown in Figs. 1 to 8 has a flat, substantially rectangular component formed winding body 1, on which three coil windings 2X, 2Y and 2Z are applied such that the axes of these coil windings in the three in each case perpendicular to each other oriented spatial directions X, Y and Z have, which are indicated in Fig. 1 and 3. The coil windings are, as can be seen from FIGS. 1 and 3, applied to the winding body 1, that a first coil winding 2X and a second coil winding 2Y in two perpendicular to each other and parallel to the median plane of the winding body 1 directions of the width and the length of the winding body are wound around this and the third coil winding 2Z along the narrow side of the bobbin 1 following its circumference wrapped around this.

The winding body 1 has on its underside guide elements 1.1 to 1.4 and at its top guide elements 1.5 to 1.8. In the embodiment shown in FIGS. 1 to 8, the winding body 1 and both the guide elements 1.1 to 1.4 at the bottom of the bobbin and the guide elements 1.5 to 1.8 are constructed at the top of the bobbin of ferrite material and are integrally and materially connected to each other. The winding body 1 is placed on a coil plate 3 made of plastic material and connected thereto. The coil plate 3 has over its thickness extending and towards its edge opening recesses 3.1 to 3.4. The inner contour and the arrangement of these recesses corresponds to the outer contour and arrangement of the arranged at the bottom of the winding body 1 guide elements 1.1 to 1.4. This design has the consequence that the winding body 1 can be placed on the coil plate 3 such that the guide elements 1.1 to 1.4 engage in the recesses 3.1 to 3.4 of the coil plate. The winding ends 2.1X of the first coil winding 2X are wound around the guide elements 1.1 and 1.3, while the winding ends 2.1Y of the second coil winding 2Y are wound around the guide elements 1.2 and 1.4.

The thickness of the coil plate 3 substantially corresponds to the thickness of the guide elements 1.1 to 1.4 of the underside of the wound body 1. The inner edges of the recesses 3.1 to 3.4 in the coil plate 3 and, as shown in Fig. 5, adjacent to them portions of predetermined width at the bottom the coil plate 3 have a metallic coating. The metallically coated sections at the bottom of the coil plate 3 are labeled 4.1 to 4.4.

The winding ends 2.1Z of the third coil winding 2Z are each wound around corner projections 3.5 and 3.6 of the coil plate 3. These corner projections 3.5 and 3.6 of the coil plate 3 and adjoining sections 4.5 and 4.6 at the bottom also have a metallic coating. This design has the consequence that the arranged on the underside of the coil plate 3 sections 4.1 to 4.6 with metallic coating each with one of the coil ends of the coil windings 2X, 2Y and 2Z can be electrically connected by soldering and thus represent the connection contacts for these coil windings. The component can therefore be placed in the assembly with the underside of the coil plate 3 on a correspondingly equipped circuit board and connected to this.

As can be taken from FIGS. 1 and 3 and the sequence of FIGS. 19A to 19E explained further below, the third coil winding 2Z extends on its upper side along the guide elements 1.5 to 1.8 and on its underside on the one hand along the guide elements 1.1 to 1.4 and additionally along the upper surface of the coil plate 3. Thus, a secure fit of the third coil winding 2Z is ensured.

In the embodiment shown in FIGS. 1 to 8 and FIGS. 18 and 19, the guide elements on the winding body 1 are arranged so that they project outwardly and each seen in a circumferential direction of the winding body 1, for example, as in Fig. 7, the guide element 1.5, are arranged at the top of the bobbin 1 substantially in front of a corner of the bobbin 1, while the associated guide elements 1.1 are arranged on the underside of the bobbin, for example, the guide element 1.1, respectively behind the relevant corner. In this case, arranged on the upper side of the winding body 1 guide elements 1.5 to 1.8 each have a transversely to their length beyond the adjacent corner led edge, while arranged at the bottom of the bobbin 1 guide elements 1.1 to 1.4 are formed as a hook-shaped, outwardly facing feet.

These embodiments, which are also clearly shown in FIG. 18, facilitate the production of the wound body 1 with the guide elements as a coherent injection-molded part, since undercuts are avoided in this way.

9 to 15 show another embodiment of a winding body, in which although the winding body 11 itself and arranged on its upper guide elements 11.5 to 11.8 made of ferrite material and are integrally connected to each other, the guide elements on the bottom of the bobbin 11, however, not in one piece connected to this. Rather, they are molded from plastic and are attached to the underside of the bobbin 11 and firmly connected with this.

For this purpose, these guide elements 6.1 and 6.2 are integrated in pairs in a plastic part 6, which is provided in the mounted state to the inside of the bobbin 11 towards projections 6.3 and 6.4 with pins 7.1 and 7.2, which in corresponding, arranged on the underside of the bobbin 11 holes 5.1 to 5.4 can be inserted. By appropriately provided bonds a solid connection is guaranteed here. There are required for each bobbin 11 two of the plastic parts 6 shown in FIGS. 12 to 15, so that after their attachment and fixing on the bottom of a total of four of the guide elements 6.1 and 6.2 are arranged. These guide elements can then be inserted into a coil plate 13, which is shown in FIGS. 16 and 17. Corresponding to the arrangement of the guide elements on the underside of the winding body 11, which protrude in pairs on two opposite sides of the winding body 11 to the outside, and the recesses 13.1 to 13.4 in the coil plate 13 in this way on two opposite sides are opening to the outside arranged. As can be seen from FIG. 17, in the case of this coil plate 13, too, in which the inner edges of the recesses 13.1 to 13.4 have a metallic coating, sections 14.1 to 14.4 adjoining the recesses 13.1 to 13.4 at the underside of the coil plate 13 are provided on the underside provided metallic coating, as well as the corner projections 13.5 and 13.6, which are provided in the bottom area with metallic coating sections 14.5 and 14.6.

In the manufacture of a miniature inductive component from the parts shown in Figs. 9 to 17, the bobbin 13 is provided in the same manner with three coil windings, as explained with reference to FIGS. 1 to 3.

The winding ends of the first and second coil windings are in turn wound around the guide elements on the underside of the winding body 11, while the winding ends of the third coil winding are wound around the corner projections 13.5 and 13.6. In the manner already described, these winding ends are then brought into electrical contact with the metalized portions 14.1 to 14.6 located at the bottom of the coil plate 13, and in this way the terminal contacts for the component are formed.

In the following, methods are described according to which inductive miniature components can be produced on the one hand according to FIGS. 1 to 8 and on the other hand according to FIGS. 9 to 17 on a correspondingly equipped production machine.

• a) Bereitstellen eines Wickelkörpers aus Ferritmaterial mit einstückig angeordneten Führungselementen an der Oberseite und an der Unterseite;
• b) Wickeln einer ersten und einer zweiten Spulenwicklung auf den Wickelkörper in zwei senkrecht zueinander und in der Mittelebene des Wickelkörpers liegenden Richtungen;
• c) Bewickeln der Führungselemente an der Unterseite des Wickelkörpers mit den Wicklungsenden der aufgebrachten Spulenwicklungen;
• d) Aufbringen eines Klebers auf vorgegebene Stellen an der Unterseite des Wickelkörpers;
• e) Bereitstellen einer Spulenplatte mit den Führungselementen an der Unterseite des Wickelkörpers zugeordneten Ausnehmungen;
• f) Zusammenfügen von Wickelkörper und Spulenplatte;
• g) Wickeln einer dritten Spulenwicklung entlang der Schmalseite des Wickelkörpers in den Raum zwischen den Führungselementen an der Oberseite des Wickelkörpers und den Führungselementen an der Unterseite des Wickelkörpers bzw. der Oberfläche der Spulenplatte;
• h) Bewickeln von Ecken oder Vorsprüngen der Spulenplatte mit den Wicklungsenden der dritten Spulenwicklung und Verzinnen dieser Wicklungsenden;
• i) Verbinden der Wicklungsenden der Spulenwicklungen mit metallischen Beschichtungen der Spulenplatte durch Löten;
• j) Abführen des Bauelements zum Messen und Verpacken.

In the manufacture of a component according to FIGS. 1 to 8, the following method steps take place automatically.

• a) providing a wound body of ferrite material with integrally arranged guide elements at the top and at the bottom;
• b) winding a first and a second coil winding onto the winding body in two directions perpendicular to one another and in the center plane of the winding body;
• c) winding the guide elements on the underside of the winding body with the winding ends of the applied coil windings;
• d) applying an adhesive to predetermined locations on the underside of the bobbin;
• e) providing a coil plate with the guide elements on the underside of the winding body associated recesses;
• f) joining the wound body and coil plate;
• g) winding a third coil winding along the narrow side of the winding body in the space between the guide elements on the upper side of the winding body and the guide elements on the underside of the winding body or the surface of the coil plate;
• h) winding corners or protrusions of the coil plate with the coil ends of the third coil winding and tinning these coil ends;
• i) connecting the coil ends of the coil windings with metallic coatings of the coil plate by soldering;
• j) removing the device for measuring and packaging.

This process is shown schematically in FIGS. 19A to 19E.

• a) Bereitstellen eines Wickelkörpers aus Ferritmaterial mit einstückig angeordneten Führungselementen an der Oberseite;
• b) Aufbringen eines Klebers auf vorgegebene Bereiche an der Unterseite des Wickelkörpers;
• c) Bereitstellen von Führungselementen aus Kunsstoff und Befestigen dieser Führungselemente an der Unterseite des Wickelkörpers;
• d) Wickeln einer ersten und einer zweiten Spulenwicklung auf den Wickelkörper in zwei senkrecht zueinander und in der Mittelebene des Wickelkörpers liegenden Richtungen;
• e) Bewickeln der Führungselemente an der Unterseite des Wickelkörpers mit den Wicklungsenden der aufgebrachten Spulenwicklungen;
• f) Aufbringen eines Klebers auf vorgegebene Stellen an der Unterseite des Wickelkörpers;
• g) Bereitstellen einer Spulenplatte mit den Führungselementen an der Unterseite des Wickelkörpers zugeordneten Ausnehmungen;
• h) Zusammenfügen von Wickelkörper und Spulenplatte;
• i) Wickeln einer dritten Spulenwicklung entlang der Schmalseite des Wickelkörpers in den Raum zwischen den Führungselementen der Oberseite und den Führungselementen der Unterseite bzw. der Oberfläche der Spulenplatte;
• j) Bewickeln von Ecken oder Vorsprüngen der Spulenplatte mit den Wicklungsenden der dritten Spulenwicklung;
• k) Verbinden der Wicklungsenden der Spulenwicklungen mit metallischen Beschichtungen der Spulenplatte durch Löten;
• 1) Abführen des Bauelements zum Messen und Verpacken.

In the manufacture of a miniature inductive component according to FIGS. 9 to 17, a method may be used in which the following method steps proceed fully automatically:

• a) providing a wound body of ferrite material with integrally arranged guide elements on the upper side;
• b) applying an adhesive to predetermined areas on the underside of the winding body;
• c) providing guide elements made of Kunsstoff and attaching these guide elements on the underside of the winding body;
• d) winding a first and a second coil winding on the winding body in two directions perpendicular to each other and in the center plane of the winding body directions;
• e) winding the guide elements on the underside of the winding body with the winding ends of the applied coil windings;
• f) applying an adhesive to predetermined locations on the underside of the bobbin;
• g) providing a coil plate with the guide elements on the underside of the winding body associated recesses;
• h) joining the wound body and coil plate;
• i) winding a third coil winding along the narrow side of the bobbin in the space between the guide elements of the top and the guide elements of the bottom or the surface of the coil plate;
• j) winding corners or protrusions of the coil plate with the coil ends of the third coil winding;
• k) connecting the coil ends of the coil windings with metallic coatings of the coil plate by soldering;
• 1) Discharge of the device for measuring and packaging.

Claims (14)

1. Inductive miniature component, in particular antenna, having a winding former designed as a flat rectangular or polygonal unit on which three coil windings are applied so that the axes of these coil windings point in the three mutually perpendicular space directions (X, Y, Z), a first coil winding and a second coil winding being wound around the winding former in its two mutually perpendicular width and length directions lying in the mid-plane of the winding former and the third coil winding being wound around the winding former along its narrow side following its circumference, the winding former consisting at least partially of ferrite material and having guide elements on a lower side for guiding the third coil winding on one of its sides, characterised by the following features:

   a) the winding former (1, 11) has guide elements (1.5 to 1.8, 11.5 to 11.8) on its upper side for guiding the third coil winding (2.Z) on its other side;

   b) the guide elements (1.5 to 1.8) on the upper side of the winding former (1.5) consist of ferrite material and are integrally connected to the winding former (1) consisting of ferrite material;

   c) the winding former (1) is placed on and connected to a coil plate (3) made of electrically nonconductive, non-ferromagnetic material;

   d) the coil plate (3) has recesses (3.1 to 3.4) extending over its thickness, the inner contour and arrangement of which correspond to the outer contour and arrangement of the guide elements (1.1 to 1.4) arranged on the lower side of the winding former (1), and the winding former (1) is placed on the coil plate (3) so that the guide elements (1.1 to 1.4) arranged on its lower side engage in the recesses (3.1 to 3.4) of the coil plate (3);

   e) the winding ends (2.1X, 2.1Y) of the first and second coil windings (2X, 2Y) are respectively wound around the guide elements (1.1 to 1.4) arranged on the lower side of the winding former (1);

   f) the winding ends (2.1Z) of the third coil winding (2Z) are respectively wound around corners or projections (3.5, 3.6) of the coil plate.
2. Miniature component according to Claim 1, characterised in that the guide elements (1.1 to 1.4) arranged on the lower side of the winding former (1) consist of ferrite material and are integrally connected to the winding former (1).
3. Miniature component according to Claim 1, characterised in that the guide elements (6.1, 6.2) arranged on the lower side of the winding former (11) consist of plastic.
4. Miniature component according to Claim 3, characterised in that the guide elements (6.1, 6.2) arranged on the lower side of the winding former (11) are integrated individually or pairwise into a plastic part (6) which comprises at least one upwardly pointing pin (7.1, 7.2) fitted into a hole (5.1 to 5.4) assigned to it on the lower side of the winding former (11).
5. Miniature component according to one of Claims 1 to 4, characterised in that the guide elements (1.1 to 1.4 and 1.5 to 1.8) protrude outwards from the circumference of the winding former (1) and are arranged so that, as seen in a circumferential direction, a guide element (1.5 to 1.8) on the upper side of the winding former (1) is respectively arranged essentially in front of one of its corners, whereas the guide element (1.1 to 1.4) assigned to it on the lower side of the winding former (1) is arranged behind the relevant corner.
6. Miniature component according to one of Claims 1 to 4, characterised in that the guide elements (11.1 to 11.4 and 11.5 to 11.8) protrude outwards from the circumference of the winding former (11) and the guide elements (11.1 to 11.4) on the lower side of the winding former (11) are arranged pairwise on two sides of the winding former (11) which face away from each other.
7. Miniature component according to one of Claims 1 to 6, characterised in that the thickness of the coil plate (3, 13) corresponds to the thickness of the guide elements on the lower side of the winding former (1, 11).
8. Miniature component according to one of Claims 1 to 7, characterised in that the recesses (3.1 to 3.4, 13.1 to 13.4) of the coil plate (3, 13) open towards the edge of the coil plate.
9. Miniature component according to one of Claims 1 to 8, characterised in that the inner edges of the recesses (3.1 to 3.4, 13.1 to 13.4) of the coil plate (3, 13) and parts of predetermined width adjoining them on the bottom and/or narrow side of the coil plate (3, 13) have a metallic coating (4.1 to 4.4).
10. Miniature component according to one of Claims 1 to 9, characterised in that the corners or projections (3.5, 3.6) of the coil plate (3), around which the winding ends (2.1Z) of the third coil winding (2Z) are wound, have a metallic coating (4.5, 4.6) on the narrow sides and/or on adjacent parts of predetermined width on the bottom.
11. Miniature component according to one of Claims 1 to 10, characterised in that the guide elements (1.1 to 1.4) arranged on the bottom of the winding former (1) are designed as outwardly pointing hook-shaped feet.
12. Miniature component according to Claims 5 and 10, characterised in that the guide elements (1.5 to 1.8) on the upper side of the winding former (1) respectively have a projection extending out transversely to their length over the neighbouring corner.
13. Method for producing an inductive miniature component according to Claims 2 as well as 9 and 10, characterised by the following method steps taking place automatically:

    a) preparing the winding former of ferrite material with integrally arranged guide elements on the upper side and on the lower side;

    b) winding the first and second coil windings onto the winding former in the two mutually perpendicular directions lying in the mid-plane of the winding former;

    c) winding the winding ends of the applied coil windings around the guide elements on the lower side of the winding former;

    d) applying an adhesive onto predetermined positions on the lower side of the winding former;

    e) preparing the coil plate with recesses assigned to the guide elements on the lower side of the winding former;

    f) joining together the winding former and the coil plate;

    g) winding the third coil winding along the narrow side of the winding former in the space between the guide elements on the upper side and the guide elements on the lower side or surface of the coil plate;

    h) winding the winding ends of the third coil winding around the corners or projections of the coil plate;

    i) connecting the winding ends of the coil windings to metallic coatings of the coil plate by soldering;

    j) removing the component for measurement and packaging.
14. Method for producing an inductive miniature component according to Claims 3 or 4 in combination with 9 and 10, characterised by the following method steps taking place automatically:

    a) preparing the winding former of ferrite material with integrally arranged guide elements on the upper side;

    b) applying an adhesive to predetermined regions on the lower side of the winding former;

    c) preparing plastic guide elements and fastening these guide elements on the lower side of the winding former;

    d) winding the first and second coil windings onto the winding former in the two mutually perpendicular directions lying in the mid-plane of the winding former;

    e) winding the winding ends of the applied coil windings around the guide elements on the lower side of the winding former;

    f) applying an adhesive onto predetermined positions on the lower side of the winding former;

    g) preparing the coil plate with recesses assigned to the guide elements on the lower side of the winding former;

    h) joining together the winding former and the coil plate;

    i) winding the third coil winding along the narrow side of the winding former in the space between the guide elements on the upper side and the guide elements on the lower side or surface of the coil plate;

    j) winding the winding ends of the third coil winding around the corners or projections of the coil plate;

    k) connecting the winding ends of the coil windings to metallic coatings of the coil plate by soldering;

    l) removing the component for measurement and packaging.

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