DE102009038739B4 - Arrangement for electrical connection, in particular electrical contact, of a multi-core coaxial cable with a circuit board, circuit arrangement and electrical device - Google Patents

Abstract

Arrangement for the electrical connection of a multi-core coaxial cable to a printed circuit board (1), with a respective core (14) of the coaxial cable to be connected being exposed in a respective axial end area, the respective exposed area for establishing an electrical connection by means of the respective clamping block (12 ) is clamp-connected, characterized in that a respective clamping block (12) is composed of a clamping block lower part (7) and a clamping block upper part (6), the clamping block lower part (7) and the clamping block upper part (6) being pressed onto one another by means of a spring element (11).

Description

The invention relates to an arrangement for electrical connection, in particular electrical contact, of a multi-core coaxial cable with a printed circuit board, a circuit arrangement and an electrical device.

In the case of coaxial cables, it is known that a central conductor running in the axial direction, that is to say a wire, is surrounded by a shield running coaxially. Multi-core coaxial cables comprise concentrically arranged coaxially extending cores, between each of which an insulation is arranged.

From the DE 695 13 509 T2 an improved electrical connection device is known.

From the DE 41 20 430 A1 a high-voltage electric line is known.

From the US 6 692 299 B1 an electrical connector for coaxial cables is known.

From JP H02- 65 075 A, a clamping block composed of a clamping block lower part and a clamping block upper part is known.

The invention is therefore based on the object of developing and developing the connection of a multi-core coaxial cable with conductor tracks on a printed circuit board.

According to the invention, the object is achieved in the arrangement for electrically connecting, in particular electrical contacting, a multi-core coaxial cable with a printed circuit board according to the features specified in claim 1, in the circuit arrangement according to the features specified in claim 14 and in the electrical device according to the features specified in claim 15.

Important features of the invention in the arrangement for the electrical connection, in particular electrical contact, of a multi-core coaxial cable with a circuit board are that a respective core of the coaxial cable to be connected is exposed in a respective axial end area, in particular in a respective different axial end area,
wherein the respective exposed area for establishing an electrical connection is clamped by means of the respective clamping block, in particular with a metal foil and / or the clamping block.

The advantage here is that contacting, i.e. electrical connection of a multi-core coaxial cable with conductor tracks on a printed circuit board, is made possible in a simple manner by arranging clamping blocks in a housing, by means of which a connection of the areas of the cores exposed by cutting the multi-core coaxial cable to the Conductor tracks is executed.

According to the invention, a respective clamping block is composed of a clamping block lower part and a clamping block upper part, the clamping block lower part and the clamping block upper part being pressed onto one another by means of a spring element. The advantage here is that either a simple, inexpensive screw connection is made possible or a clamping force that is defined by the deflection of the spring means and gently acting on the cable can be generated.

In an advantageous embodiment, the respective clamping block is electrically connected to at least one conductor track on the circuit board. The advantage here is that the clamping means itself also functions as an electrical connection means.

For this purpose, the clamping block is made in particular of metal or is at least electrically conductive.

In an advantageous embodiment, the clamping block is soldered to a conductor track on the circuit board. The advantage here is that the clamping means not only functions as an electrical connection means, but the printed circuit board also performs a holding function for the clamping means, the clamping means in turn performing a holding function for the multi-core coaxial cable.

In an advantageous embodiment, press-in feet are formed on the clamping block or are connected to the clamping block, by means of which the clamping block is soldered to a conductor track on the printed circuit board. The advantage here is that a simple connection is implemented, in particular without additional connecting means.

In an advantageous embodiment, the spring element is arranged between the upper clamp block part and the lower clamp block part and / or the spring element is arranged between one of the parts and a surrounding housing. The advantage here is that the clamping force can be generated by pressing the clamping frame parts onto one another.

In an advantageous embodiment, a housing surrounding the clamping blocks is composed of at least one upper housing part and at least one lower housing part. The advantage here is that the clamping force can be generated when the housing is assembled and closed, in particular that is to say simultaneously with all the clamping blocks.

In an advantageous embodiment, the upper housing part and the lower housing part can be screwed together. The advantage here is that a simple and inexpensive connection is implemented.

In an advantageous embodiment, the upper part of the housing has receiving areas for the upper parts of the clamping block and the lower part of the housing has receiving areas for the lower parts of the clamping block, in particular with the holding of the clamping block parts being carried out in a non-positive manner, in particular by elastic deformation of areas of the housing parts. The advantage here is that no additional funds are necessary and an elastically deformable plastic part can be used as the housing.

In an advantageous embodiment, a support ring is pushed under the respectively exposed area, in particular under the respectively exposed axial end area. The advantage here is that high clamping forces can be used and a constriction of the wires can nevertheless be avoided and thus the cross section remains unchanged, so that the high-frequency signals are passed through without any significant deterioration.

In an advantageous embodiment, a metal foil is pushed over the respectively exposed area, in particular over the respectively exposed axial end area, in particular a force-fit connection of the clamping frame parts with the metal foil and the respectively exposed area of the wire when the clamping frame parts are pressed onto one another or screwed together is executed. The advantage here is that the electrical contact resistance is reduced, in particular because the metal foil fits into unevenness, in particular also into unevenness caused by the clamping force. Furthermore, the film enables the cable to be pre-assembled, since it can be glued onto the wire, which can be produced as a braid. This holds the braid together and protects it. In addition, the film is dimensioned in such a way that it exerts a small clamping force with which the ring inserted under the wire is held, in particular at least for transport purposes.

In an advantageous embodiment, the jacket is held non-positively as strain relief in a further clamping block, in particular the clamping block being composed of a clamping block lower part and a clamping block upper part, which are received in the corresponding housing parts, i.e. the upper housing part and the lower housing part. The advantage here is that strain relief can be achieved with a clamping block of the same type as the other clamping blocks. So there are only a few types of parts to keep in stock. In particular, due to the similar design of the clamping blocks, which differ only in the diameter of the recesses that accommodate the exposed areas of the wires.

Important features of the circuit arrangement, comprising a printed circuit board and by means of an arrangement described above, are that wires of the multi-wire coaxial cable are electrically connected to respective conductor tracks of the printed circuit board via terminal blocks.

The advantage here is that further electronic components can be provided on the circuit board.

Important features of the electrical device are that it is designed with a circuit arrangement as described above. The advantage here is that a coaxial cable can be connected quickly and easily to a printed circuit board of the electrical device, and reliable contact can be ensured.

Further advantages result from the subclaims.

• In der 1 ist eine erfindungsgemäße Anordnung in Schrägansicht gezeigt, wobei ein mehradriges Koaxialkabel mittels einer Anschlussvorrichtung elektrisch mit einer Leiterplatte verbindbar ist.
• In 2 ist ein teilweise angeschnittenes Gehäuse der Klemmvorrichtung gezeigt.
• In 3 ist ein Klemmbock in einer ersten Ausführungsvariante gezeigt.
• In 4 ist ein Klemmbock in einer weiteren Ausführungsvariante gezeigt.
• In 5 ist ein mehradriges Koaxialkabel gezeigt, das zumindest teilweise abgelängt ist, so dass die Adern 14 des Koaxialkabels teilweise frei liegen.
• In 6 ist ein mittels unter die Ader 14 untergeschobenem Stützring 9 vorkonfektioniertes mehradriges Koaxialkabel gezeigt, wobei im entsprechenden axialen Bereich auf den frei liegenden Bereich der Ader 14 eine Metallfolie 8 aufgeschoben und/oder aufgeklebt ist.
• In 7 ist ein Teilbereich von 6 vergrößert dargestellt.

The invention will now be explained in more detail with reference to figures:

• In the 1 an arrangement according to the invention is shown in an oblique view, wherein a multi-core coaxial cable can be electrically connected to a circuit board by means of a connection device.
• In 2 a partially cut-away housing of the clamping device is shown.
• In 3 a clamping block is shown in a first variant.
• In 4th a clamp is shown in a further variant.
• In 5 a multi-core coaxial cable is shown, which is at least partially cut to length so that the cores 14th of the coaxial cable are partially exposed.
• In 6th is a means under the vein 14th support ring pushed underneath 9 Prefabricated multi-core coaxial cable shown, with the exposed area of the core in the corresponding axial area 14th a metal foil 8th is pushed on and / or glued on.
• In 7th is part of 6th shown enlarged.

Each coaxial line of the coaxial cable is referred to as a core. The wire can also be designed as a metal foil or as a stranded wire, the wire filling an essentially hollow-cylindrical area. Likewise, an optionally provided center conductor, which is designed as a round wire, is also referred to as a stranded wire.

The multi-core coaxial cable 2 has a coat 13th on, the electrical lines of which are arranged coaxially. Here is the innermost vein 14th designed as a center conductor, for example as a simple round wire, and from a first insulation 15th surround. To this isolation 15th there is another vein around it 14th arranged, in particular in a hollow cylindrical design. This vein 14th is in turn of isolation 15th surrounded, in turn by a vein 14th is surrounded. The outer circumference is the coat 13th arranged.

The cable direction is also referred to as the axial direction. The multi-core coaxial line is cut to length in a stepped manner at one of its axial end areas, so that the cores are exposed in axially different areas. The diameter of the exposed wires 14th are each different.

On the circuit board 1 is the lower part of the housing 4th provided on which the upper part of the housing 3 is attachable and connectable. In the housing formed in this way, clamping blocks are provided which form a clamping block lower part 7th and a clamping block upper part 6th include. The respective lower part of the clamping block is here 7th made of metal and in a recess in the lower part of the housing 4th used and has metallic press-fit feet, with which the electrical connection to the conductor tracks of the circuit board 1 is made. Optionally, in addition to this electrical connection produced by a press-fit connection, there is a soldered connection on the side of the printed circuit board facing the clamping block 1 These press-in feet can be implemented or alternatively 5 inserted through recesses in the circuit board and on the side of the circuit board opposite the clamping block 1 soldered.

The respective upper part of the clamping block 6th made of metal and in a recess in the lower part of the housing 4th used. After the upper parts have been placed on the lower parts, a respective one has the respective lower clamp part 7th and the respective upper part of the bracket 6th formed clamping block on a recess, which on the diameter of the assigned exposed core of the multi-core coaxial cable 2 is matched. For the electrical connection between the clamping block and the wire, between the wire 14th and clamp a metal foil 8th and a support ring 9 arranged. Here is the support ring 9 under the vein 14th pushed and the copper foil on the wire 14th postponed. The electrical contact resistance is thus reduced. In addition, the presses when connecting the upper part of the clamping block 6th with the lower part of the clamping block 7th The clamping connection reached the wire in such a way that a reduced contact resistance from the wire to the clamping block is also achieved.

For each wire to be connected 14th a clamping block is assigned.

The coat 13th the multi-core coaxial cable is in a further clamping block 12th arranged for strain relief. This clamp connection is thus equipped with the largest recess. The axially following recesses of the respective clamping blocks have a corresponding monotonically decreasing diameter.

In a first embodiment, the clamping block is according to 3 and in another after 4th executed.

It is after 3 a screw connection between the upper part of the clamping block 6th and clamp base 7th provided so that high clamping forces can be generated in a simple manner. For this purpose, there is a screw connection part in the upper part of the clamping block 10 can be screwed in to produce the screw connection.

Alternatively is after 4th a spring element 11th provided, the spring force of which causes the clamping force. Here is the spring element 11th between the upper part of the housing 3 and clamping block upper part 6th provided and generated when connecting the upper part of the housing 3 with the lower part of the housing 4th the contact pressure. Housing upper part 3 and lower part of the housing 4th are provided screwed onto one another or otherwise positively connected, for example with a clip connection.

To hold the upper clamping bracket parts in the upper housing part, a clip-in connection is advantageous which, after clipping in, allows the upper clamping bracket part to be displaced in the direction of the lower clamping bracket part, the displacement path comprising the spring path. For this purpose, an elevation, such as a nose, can be provided on the inner wall of the upper part of the housing, which engages in a depression, such as a groove or notch, on the upper part of the clamping block after the elevation has been clipped into this depression.

In a further exemplary embodiment according to the invention, the spring element is between the upper part of the clamping block 6th and clamp base 7th arranged so that the upper housing part 3 when placing it on the lower part of the housing 4th the upper part of the clamping block 3 by means of the spring element 11th on the lower part of the clamping block 7th presses.

The upper housing part and the lower housing part are preferably made from a plastic, in particular from an elastically deformable, electrically insulating plastic.

In a further exemplary embodiment according to the invention, the upper part of the clamping block is between 6th and clamp base 7th a guide is provided which is provided on one of the parts as a pin and on the other of the parts as a corresponding recess receiving the pin.

List of reference symbols

1

Circuit board

2

multi-core coaxial cable

3

Housing upper part

4th

Housing base

5

Press-fit feet

6th

Upper part of the clamping block

7th

Clamping block lower part

8th

Metal foil, especially copper foil

9

Support ring

10

Connecting screw part

11th

Spring element

12th

Clamp

13th

a coat

14th

Vein

15th

electrical insulation

Claims (15)

Arrangement for the electrical connection of a multi-core coaxial cable to a printed circuit board (1), with a respective core (14) of the coaxial cable to be connected being exposed in a respective axial end area, the respective exposed area for establishing an electrical connection by means of the respective clamping block (12 ) is clamp-connected, characterized in that a respective clamping block (12) is composed of a clamping block lower part (7) and a clamping block upper part (6), wherein the clamping block lower part (7) and the clamping block upper part (6) are pressed onto one another by means of a spring element (11). Arrangement according to Claim 1 , characterized in that the clamping block (12) is made of metal or at least electrically conductive. Arrangement according to one of the preceding claims, characterized in that the spring element (11) is arranged between the upper clamping block part (6) and the lower clamping block part (7) and / or the spring element (11) is arranged between one of the clamping block parts and a surrounding housing. Arrangement according to Claim 3 , characterized in that a housing surrounding the clamping blocks is composed of at least one upper housing part (3) and at least one lower housing part (4). Arrangement according to Claim 4 , characterized in that the upper housing part (3) and the lower housing part (4) can be screwed together. Arrangement according to Claim 3 or 4th , characterized in that the housing upper part (3) has receiving areas for the clamping block upper parts (6) and the housing lower part (4) has receiving areas for the clamping block lower parts (7). Arrangement according to one of the preceding claims, characterized in that a support ring (9) is pushed under the respectively exposed area. Arrangement according to Claim 7 , characterized in that a metal foil (8) is pushed and / or glued over the exposed area of the multi-core coaxial cable (2), the metal foil (8) being dimensioned such that a clamping effect for a support ring ( 9) is achieved. Arrangement according to one of the preceding claims, characterized in that the jacket (13) of the multi-core coaxial cable (2) is held in a non-positive manner as a strain relief in a further clamping block (12). Arrangement according to Claim 9 , characterized in that the further clamping block (12) is in turn composed of a clamping block lower part (7) and a clamping block upper part (6), which are received in the corresponding housing parts, i.e. housing upper part (3) and housing lower part (4). Circuit arrangement comprising a printed circuit board (1) and a multi-core coaxial cable connected by means of an arrangement according to one of the preceding claims, characterized in that the cores (14) of the multi-core coaxial cable (2) are electrically connected to respective conductor tracks of the circuit board (1) via clamping blocks (12) ). Circuit arrangement according to Claim 11 , the respective clamping block (12) is electrically connected to at least one conductor track of the circuit board (1). Circuit arrangement according to Claim 11 or 12th , characterized in that the clamping block (12) is soldered to a conductor track of the circuit board (1). Circuit arrangement according to Claim 11 , 12th or 13th , characterized in that press-fit feet (5) are formed on the clamping block (12) or are connected to the clamping block (12), by means of which the clamping block (12) is soldered to a conductor track on the printed circuit board (1). Electrical device with a circuit arrangement according to one of the Claims 11 until 14th .

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