EP0889544A2 - Electrical thin wire connection - Google Patents

Abstract

The contact is in the form of a piece of thin sheet material that is folded into an U-shaped section (1) into which the wire (5) is inserted. The wire is clamped into contact with the U-shaped section and is in electrical contact with at least one side of the U-shaped section. The section at the centre (4) has to be separated to insert the wire and when released the spring action maintains good contact with the wire.

Description

The contacting of very fine wires, such as those found in electroacoustic Hiking headphones or microphones is used often very problematic and very labor intensive because of the wire thickness of the Wires to the electro-acoustic transducer, e.g. to the electrodynamic converter, are often smaller than 100 µm and, moreover, often aluminum as a wire material is used, which is not always reliable with such wire thicknesses and can be easily connected to a contact socket.

So far - such as disclosed in WO 81/00328 - is used for electrical contacting of fine wires with a contact socket in the contact area between wire and inserted a wedge in a tubular contact socket so that the wire with the Contact socket is jammed and an electrical contact is made. The previous electrical contacting of fine wires is very labor intensive because Automation has so far been practically impossible, and thus manufacturing of the contact must be done manually.

To understand which wire leads of an electro-acoustic transducer the contact socket must be connected, is also on DE A 42 43 308 pointed out, in which an electro-acoustic transducer is disclosed, in particular of headphones, with a membrane carrying a voice coil of the transducer and with two wire feed lines that run over the membrane to the voice coil. This On the one hand, wire feed lines lead to the membrane and, on the other hand, have to be included a contact socket are electrically connected.

It is the aim of the invention, the electrical contacting of fine wires with the Simplify contact socket and make it safer, so that also automation is possible and the manufacturing costs for electrical contacting be reduced.

According to the invention, electrical contacting is used to achieve the object a fine wire proposed, in which the contact socket two opposite Has plates in which a plate clamping area is provided in which the plate distance is smaller than in the other plate areas and in Clamping area, the wire is clamped between the plates and with at least one of the plates is electrically connected. Advantageous further training are described in the subclaims.

Furthermore, an electro-acoustic transducer with a contact with the above Features described as well as an electrical device with a such an electro-acoustic transducer and a method for producing the electrical Contacting the fine wire.

It has been found that with the jamming of the contact Wire between the plates a very simple and reliable contact connection can be manufactured. To produce the contact according to the invention the wire to be contacted only needs to be positioned between the plates be and the plates are then by applying an external force in the Clamping area pressed together and here the wire is in the clamping area jammed between the plates.

It was also found that the contacting or by the inventive method for producing this contact Connection is established, which is mechanically sufficiently firm and electrical is very good conductor. The contacting according to the invention also means that Wire in the clamping area is automatically protected because the opposite one Cover the wire of the contact socket in the clamping area.

The contact is stabilized when the plates are together in the clamping area be connected, e.g. by applying a spot weld from the outside. Such welding automatically turns any insulation or baking varnish on the wire in the clamping area even more effectively than by the clamping itself on the side displaced and the displaced lacquer then seals the contact area.

By clamping the wire in the clamping area, the wire is through the The clamping force is deformed so that the wire spreads out in the clamping area sets. As a result, the surface of the wire and thus the contact area becomes closed the plates enlarged.

Further advantageous developments of the invention are described in the subclaims.

Fig. 1

eine perspektivische Aufsicht auf eine erfindungsgemäße Kontaktierung eines Drahtes und einer Kontaktbuchse;

Fig. 2

eine Aufsicht von oben auf die Kontaktierung nach Fig. 1;

Fig. 3

einen Schnitt gemäß der Ebene A-A in Fig. 3;

The invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawings. In the drawings:

Fig. 1

a perspective view of an inventive contacting a wire and a contact socket;

Fig. 2

a top view of the contact according to Fig. 1;

Fig. 3

a section along the plane AA in Fig. 3;

Fig. 1 shows a perspective view of a contact socket, which as a U-shaped Contact plate 1 with two substantially opposite plate legs 2 and 3 is formed. In the middle area 4 of the two opposite Plates 2 and 3 are smaller by clamping from the outside Spaced apart than in the plate areas outside of the clamped Area. Within the contact socket between the opposite plates a fine wire 5 is arranged in the longitudinal direction of the contact socket and in Clamping area 4 clamped between the plates 2 and 3 of the contact socket.

The fine wire 5 undergoes a deformation, preferably one, in the clamping area 4 Spreading so that the fine wire has a larger outer surface in the clamping area has as outside the clamping range. By trapping the Fine wire in the clamping area is also baked and / or insulating varnish, which surrounds the wire pushed to the edge area of the sheet-wire contact, so that the sheet-wire contact through the insulation and / or baking varnish after is protected on the outside.

To fix the sheet metal plates, they are connected to each other in the clamping area, be it by gluing or welding, e.g. Spot welding from the outside. Fig. 1 shows a plan of an elongated weld 6, which runs essentially perpendicular to the wire 5.

Fig. 2 shows the top view of the contact plate 1. Here it can be seen that by clamping the opposite plates 2 or 3 in the clamping area 4 the distance between the plates is significantly smaller than in the areas outside of the clamping area. The plate areas also protect outside the clamping area there the wire, so that even if the wire is arranged differently from the wire longitudinal direction shown no wire break through a kink fear. The spreading angle between the opposite plates should be between 1 ° and 30 °, but it is also a larger radius conceivable, as indicated by the dashed line in Fig. 2. At a the pull-out forces required can be sufficiently small to pull the wire out of the contact plate, greater than the tensile strength of the wire itself.

Fig. 3 shows a section along the line A-A in Fig. 2. Here is particularly good the spreading of the wire in the clamping area can be seen. By spreading of the wire, the contact surface between wire and sheet is increased, so that unwanted transition resistances cannot arise at all.

When making contact between a wire and contact socket First of all, the wire to be contacted between the opposite ones Plates positioned. Then from the outside on the plates in the clamping area appropriate clamping force is applied, whereby the plate distance in the clamping area is reduced so far that the wire is pinched between the two plates becomes. The contact is now established. For better fixation the plates against each other can still be welded together, glued or jammed with appropriate clamping means.

With the contacting described, a satisfactory electrical Connection of a wire with a nominal diameter of approximately 100 µm or less, e.g. 40 µm can be achieved with the contact socket. All work steps could be carried out mechanically, which was extremely low Dimensioning the individual components of the wire and contact socket is very helpful.

Any conventional wire material, in particular aluminum or CuSn can be used. A CuSn material can also be used as the contact material be used, which is provided with a nickel, silver or gold layer is.

Claims (11)

Electrical contacting of a very fine wire (5) with: a contact plate (1) with two opposite plates (2, 3); a plate clamping area (4) in which the plate spacing is smaller than in the other plate areas; and in the clamping area (4) the wire is clamped between the plates (2, 3) and is in electrical contact with at least one plate. Contacting according to claim 1, wherein the wire (5) in the clamping area (4) has a larger outer surface than outside the clamping area (4). Contacting according to claim 1 or 2, wherein the wire (5) in Clamping area (4) is spread open. Contacting according to one of the preceding claims with a Welding or gluing the plates (2, 3) in the clamping area (4). Contacting according to one of the preceding claims, in which the Plates (2, 3) legs of a substantially U or V-shaped curved Contact sheets (1) are. Contacting according to one of the preceding claims, in which the Plates (2, 3) one of the clamping area (4) substantially in the longitudinal direction of the Have wire (5) extending outward curvature. Contacting according to one of the preceding claims with a Wire with a nominal diameter of about 100 µm or less (e.g. 40 µm). Electro-acoustic transducer with a lead wire (5) and one Contacting according to one of the preceding claims. Electrical device, in particular headphones or microphone, with a electrical converter according to claim 9. Method for producing an electrical contact of a very fine wire (5) according to one of the preceding claims with the following method steps: a) The wire (5) to be contacted is positioned between the two opposite plates (2, 3). b) In the area (4) in which an electrical contact is to be made between the wire and at least one of the plates, the plate spacing is reduced by clamping from the outside to such an extent that the wire (5) between the two plates (2, 3) is pinched. The method of claim 11, wherein the plates (2, 3) in the clamping area (4) be connected to each other.

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