DE7808880U1 - ELECTRICAL COMPONENT WITH CONNECTING WIRE FOR PLUGING INTO HOLES OF A CIRCUIT BOARD - Google Patents

Description

Electrical component with connecting wires for insertion into holes in a circuit board .

The present invention relates to an electrical component with lead wires for insertion into bores a circuit board, the connecting wires having a bead to limit the insertion depth, in particular a ceramic capacitor «

Such components with an annular bead are known from DT-OS 23 46 340, for example. This bead is the lower one Page as a result of the type of manufacture by dipping in a tin bath and targeted cooling and solidification of the adhering Tin in the form of a circumferential throat.

From the DT-GM 77 09 932 it is also known, the bottom of the bead in the form of a cone and provide the immersion cover up to the top of the bead.

In these designs, as a result of the conical design the underside of the bead when inserting the connecting wires into a hole in a printed circuit board, the hole sealed from above as if by a conical valve disc.

As a result, in the subsequent soldering process, in particular during dip soldering, the gases and residues of the soldering aid produced can be removed do not escape upwards. The consequence of this can be cold soldering points, as the gases form a cushion, that can prevent the supply of solder between the connecting wire and the conductor track.

The object of the present invention is therefore to provide measures such as perfect soldering in the arrangement a bead on the connecting wire can be achieved.

According to the invention this is achieved in that the circuit board facing underside of the annular bead is asymmetrical and / or uneven. This is where the lower edge lies not completely on the circuit board, so that gases and soldering aids produced during the soldering process escape upwards can. As a result, the solder can penetrate into the hole, which is particularly safe in the case of plated-through holes Ensure that the connecting wire is soldered to the conductor tracks.

Further advantageous details of the invention are given below with reference to the exemplary embodiments illustrated in the drawing described.

Fig. 1 shows a bead according to the invention, the center line of which is parallel to the axis of the connecting wire

ι ■ · · I ·

runs from the side,
2 shows a bead, the underside of which has a cone,

whose axis of symmetry has an acute angle to the axis

of the connecting wire and Fig. 3 shows an electrical component with the invention

Connecting wires.

In Fig. 1, 1 denotes a connecting wire of an electrical component, not shown, whose lower End 2 for insertion into a bore 3 of a circuit board 4 is used. An annular bead 5 is formed on the connecting wire 1, especially upset, the underside 6 of which in the form of a circumferential Groove 7 is formed. According to the invention, the Dnterseite6 is asymmetrical and uneven in that the annular bead 5 with the fillet is arranged offset in such a way that its center line or axis of symmetry 8 is eccentric about runs parallel to the axis 9 of the connecting wire 1. Through this

the fillet 7 is on the side after which it is parallel

end

is pushed, radially farther from the axis 9 'and down longer than on the other side. This causes in the cen- V- trical insertion of the lead wire 1 in the bore 3, that

% the fillet 7 at the point with the larger radius of the

t axis 9 strikes against the upper edge 10 of the bore 2 as seen from

and thereby the fillet 7 at points with a smaller radius ■ a gap 11 between these points and the upper edge 10

releases. The gases and vapors produced during soldering can escape through this gap 11, so that the soldering metal is removed from can easily climb up into the bore 3 below if, as shown in the exemplary embodiments, the conductor tracks 12 are plated through.

In the embodiment according to Fig. 2, the annular bead 5 is centered on the connecting wire 1, but the underside 6 is e.g. formed by a cone 13, the symmetry axis 8 of which forms an acute angle to the axis 9 of the connecting wire 1. Instead of the cone 13, a groove 7 can also be provided here be. In addition, the cone 13 or the fillet 7 could optionally be displaced in parallel with the annular bead 5 as is an example according to FIG. 1.

This inclination of the axis of symmetry 8 ensures that the cone 13 has a different LäK. ^ E at every point on the circumference and the cone shell has a different angle to the axis 9. This causes the centric or eccentric insertion of the Connection wire end 2 in the hole 3 a gap 11 for the escape of gases and vapors during the soldering process.

3 shows an electrical component 14, for example a ceramic disc capacitor with two connecting wires 1 according to the invention. The two connecting wires 1 have one

I C £

Distance corresponding to the pitch for printed circuits, or a multiple thereof. The undersides are advantageous 6, although designed in the same way, but arranged so as to be rotated with respect to one another. They are preferably 180 ° from one another twisted attached. This creates a gap 11 between the underside of the two connecting wires 1 with certainty 6 of the annular bead 5 and the upper edge 10 of the holes 3 and thus always achieved a perfect soldering.

According to an advantageous embodiment, the annular bead 5 each provided just below the lower edge 15 of the component 14 and it is used when the component 14 is immersed in a Dipping compound for the purpose of achieving a sheath 16 for the clear delimitation of the sheath along the connecting wires 1. As a result the lacquer trousers 17 which otherwise arise during dipping on the connecting wires 1 are limited to a defined length and it also prevents the lacquer pants 17 from reaching into the bore 3 and preventing a good soldering.

is
The invention * can be used for all components with electrical wire connections that can be plugged into printed circuits, e.g. for resistors, diodes, transistors, thick and thin-film modules, potentiometers, hot and cold conductors, etc.

Claims (7)

STETTNER & CO run a.d. Pegnitz StCo 9.3 / 78 03/16/1978 Hs / Kra Electrical component with connecting wires for inserting into holes in a circuit board. 1. Electrical component with connecting wires for plugging in H in bores of a circuit board, with the connection wires have a bead to limit the insertion depth, in particular a ceramic capacitor, characterized in that the underside (6) of the annular bead (5) facing the circuit board (4) is asymmetrical and / or uneven. 2. Component according to claim 1, characterized in that the underside (6) forms a circumferential groove (7) or a cone (13) whose axis of symmetry (8) or the axis of symmetry of the annular bead (5) is eccentric runs parallel to the axis (9) of the connecting wire (1). 1 or 3. Component according to claim ^V 2, characterized in that the axis of symmetry (8) to the axis (9) of the connecting wire (1) forms an acute angle. 4. Component according to oinem of claims 1 to 3, characterized in that with at least two in the grid dimension of the bores (3) of a circuit board (4) provided connecting wires (1) of a component (14) on sieve, similar undersides (6) of the Ringwulsxe (5) are not arranged in the same P ⁱ - ^ -, ang, but are arranged rotated relative to one another. 5. The component according to claim 4, characterized in that the rotation is approximately 180 °. €. Component according to one of Claims 1 to 5, characterized in that the component is covered with insulating compound (16) and this extends at most to the annular bead (5). 7. The component according to claim 6, characterized in that the annular bead (5) forms the boundary for the insulating compound (16) during the immersion process of the component (14) in this.