DE8334393U1 - PRINTED PCB AS ADAPTER - Google Patents

Description

Helmut Kramer Elektronik 8000 Munich 90 Walchenseeplatz Printed circuit board

The invention relates to a printed circuit board as an adapter between a device-side connector and an assembled circuit board to be tested, with sockets or sockets formed on opposite sides. Pin headers and conductor tracks running between them.

A circuit board of this type is generally used to test populated circuit boards on a device, with in most cases the testing must be carried out while the device is in operation. For reasons of space, however, it is usually not possible to use the measuring instruments or To get measuring probes to the individual measuring points of the circuit. For this purpose, an adapter circuit board mentioned above is used, which is in the tightly dimensioned tree of the device is plugged in. On, the other side of the adapter circuit board can then the to be tested board are used and is therefore in a corresponding hatred of the circuit board more accessible tree so that it can be easily measured and checked.

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But now it has been shown with the conventional printed circuit boards that interference pulses can occur due to the long lines leading out of the device, which the Can significantly affect measurement results. These high-frequency interference pulses are caused by capacitive Influence of the parallel lines among each other. The capacities responsible for the glitches can also occur to a particular extent when a conductive ground layer in the form of a copper insert or in the plate the same is provided to which the lines are routed in parallel paths.

The object of the invention is therefore to develop a circuit board of the type mentioned in such a way that the occurrence of interference pulses is largely avoided.

This object is achieved by the features cited in the characterizing part of claim 1.

With the inventive arrangement of the lines on the Adapter circuit board a certain decoupling of the conductor tracks is achieved with each other, with the Shortening the common parallel paths the capacities are noticeably reduced, which means that glitches are hardly any occur more. In addition, the frequency with which the conductor tracks change sides can be more and more decoupled can be increased more.

Further details and gate parts of the invention result from the subclaims in connection with the description of exemplary embodiments, which are detailed with reference to figures are explained. Show it:

FIG. 1 is a side view of an adapter circuit board; Figure 2 is a view of a circuit board according to the invention;

FIG. 3 shows a change point of three according to the invention adjacent conductor tracks on an enlarged scale;

FIG. 4 shows a cross section III minus III from FIG. 3;

Figure 5 is a view of another embodiment, the invention ; and

Figure 6 shows a further embodiment of the invention.

In Figure 1, 1 denotes a circuit board on the a pin or connector strip 3 is arranged on one side. Opposite this connector strip is on the other side a female connector 2 attached. Power strip and socket strip are connected to the conductor tracks applied to the plate 1 by means of lines 4. On the way one each conductor track is a small switch 5, through the respective. Conductor can be bridged or interrupted. Before and after each switch 5 is in each case a Pin or post 4 conductively connected to the conductor track provided in order to make measurements or to be able to connect different conductor tracks with one another. On the side of the Socket strip 2 are also card handles 7 with an ejector attached, which guides and picks up the printed circuit board to be tested.

In Figure 2, a bare circuit board is shown, on which a plurality of parallel conductor tracks' are arranged. On the right-hand side, the conductor tracks open out into a large number of soldering points, of which the lines 4 go out to socket strip 2 according to FIG. Ht same way there are three rows of solder pins on the left side, which are connected to the connector strip 3 via the lines 4.

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Between the soldering points on the left and the conductor tracks 8 there are also a large number of soldering points or contact points, this recording of the small switch 5 and the pins 4 is used. In the middle of the printed circuit board 1, the conductor tracks 8 are through a change point 9 interrupted in that (each individual conductor track 8 ends in a soldering point that contacts through the plate 1 and leads to a soldering point on the other side of the plate as described in more detail in point 4.

Incidentally, on the other side of the plate, there is essentially one the same arrangement of conductor tracks and soldering points is provided, although the tracks do not necessarily have to cover. Expediently, there is even a certain offset between the individual or specific tracks.

In Figure 3 is a section of a change point 9 is a Board 1 shown. In this figure it is shown how three conductor tracks 8 on each side of their circuit board Cross paths to continue walking after the change point on the other side and next to at least one other lane. The solid and hatched lines are on the top of the board, while the dashed lines Tracks are arranged on the underside of the board. For example, the conductor track 81 leads to a central hole

101, which like all the holes are plated through, and is on the underside of the board with the conductor track 81 / in the follow-up area B connected. The conductor path 84 / corresponding approximately to conductor path 81 on the underside in area A leads to the bore

102, at which it is connected upwards and from where a conductor track 84 leads to the top of the subsequent area B. the Also on the underside in area A, conductor track 85 is slightly offset from tracks 81 and 84 / crosses on the underside of the board the two curved lines of the tracks 81 and 81 running on the upper side and opens into the bore 103, which is connected at the top to the conductor track 85 located at the top.

In the same way, at the changeover point 9, the conductor track 82 on the top of the board crosses the two on the underside curved conductor tracks 83 / + 86 /, so that all in all those lying next to one another in area A. Lines 81-82-83 in area B on the underside of the Have sequence 81 / -83 / -82 /. In the same way, the Position of the webs on the underside in the area A 85 / -84 / -86 / changed by means of the changeover point 9 so that in the area B, panels 84-85-86 are next to each other on the top.

In this way, according to the invention, there are three conductor tracks on the top and three on the bottom 8 crossed with each other or "twisted", so that after the change point on the other side of the board and? . Continue to advance next to at least one other lane.

Instead of crossing three lanes on one side with three lanes on the other side, it goes without saying possible to change four or more lanes in a corresponding manner in their position. Besides, depending on your needs can also a second, third and more changeover points can be provided on a circuit board.

Section III - III is shown in detail and enlarged in FIG. 4, essentially showing the through-hole contacting of the bore 104, which is connected to the conductor track 82 on the underside of the circuit board and to the conductor track 82 on the upper side. In addition, the conductor track 86 / is shown on the underside in FIG. 4, which leads to a hole further back in the drawing. Furthermore, it is shown in FIG. 4 that the circuit board 1 can have a ground layer 11 in its center plane, which has a recess 12 in each case in the area of a bore 10 (Ί04). This recess is intended to prevent contact between the conductor tracks and the ground layer.

In FIG. 5 there is another alternative to that shown in FIG Embodiment shown. On the top and the bottom of the circuit board 1 is a plastic layer 13 applied, on which a further Hasse layer, preferably a copper clad 14 is located. With the double hate layer ensures an even better shielding of the lines for very fast signals, whereby under certain circumstances the capacitive influences are increased, so several changeover points are provided on one circuit board have to. Of course, the Hasse layers 14 and plastic layers 13 in certain areas, for example be cut out in the areas of the bores 10.

Another alternative of the combination of conductor tracks and hate layers is shown in FIG. In this embodiment, so-called island technology is used, in which all conductor tracks 8 and contact points 10 are surrounded by the additional hatch layer 14 /. This embodiment has the advantage over that of FIG 5 has the advantage that the whole circuit board can be made thinner _f and additionally ensures an even better shielding.

Claims (8)

Helmut Kramer Elektronik 8000 Munich 90, Walchenseeplatz 1.) Printed circuit board as an adapter between a terminal strip on the device and one to be tested , and assembled circuit board, with sockets or sockets formed on opposite sides. Track pin headers and conductors running between them, characterized in that each conductor track (8) the flattfcnseite changes at least once in such a way that after each change of page every page changes Conductor track has at least one other neighboring conductor track (81-82-83; 81 / -83 / 82 / -). 2.) Circuit board according to claim 1, characterized in that the change of side of the conductor tracks (8) on a change point (9) takes place, at which the conductor tracks (82; 85 /) on one side of the plate (1) the corresponding conductor tracks (83 /, 86 /; 81, 84) crosses on the other side. 3.) Printed circuit board according to claim 1 or 2, characterized in that gekunn that to change sides of a conductor track (8) this through a bore (10), which is conductive is coated, is carried out. 4.) Circuit board according to one of claims 1 - 3 »characterized in that two conductor tracks (82, 83) on one side and one conductor track (86) on the other side of the board cooperate for a change (9). 5 ·) printed circuit board according to one of claims 1-4, characterized characterized in that in the board (1) formed from an insulation material f a parallel to the board - f; flat mass layer (11) is provided, f which one in each case in the area of the bores (10) ; Has recess (12). 6.) Circuit board according to one of claims 1 - 5 »characterized in that the conductor tracks (8) equipped Top of the board (1) with a plastic layer (13) are coated, on which a further mass layer (14) is applied. 7.) Printed circuit board according to claim 6, characterized in that that mass layer (14) and plastic layer (13) are recessed in the area of the bores (10). 8.) Printed circuit board according to one of claims 1-5 »characterized in that the conductor track on each side of the plate (8) and contact points of the bores (10) in the shape of an insula from a further mass layer (14) are surrounded, which does not touch the conductor tracks.