DE2734819A1 - ELECTRIC PCB - Google Patents

Description

2734819 Wpl.-Phys. OE Weber ^ ^ w ο-β MOnch.n π

Hofbrunnstrasse 47

Telephone: (069) 7915050

Telegram: monopoly weavers some

M 580

MOTOROLA INC.
East Algonquin Road
Schaumburg, 111. 60196
United States

Electrical circuit board

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The invention relates generally to the manufacture of electrical circuits, and more particularly relates to one specially manufactured electrical circuit board.

The invention also relates to manufacturing a board for a printed circuit board.

The manufacture of electrical circuits using electrical circuit boards or boards for printed circuits is known per se. Conventionally, a printed circuit board is made of insulating material which is processed in such a way that the electrical components can be arranged thereon by the electrical connections between the individual components being formed by metallized areas which are provided either on one or both sides of the board are. The processing of the plate includes the drilling or punching of holes at predetermined locations on the plate to receive lead wires of electrical components. Larger openings of various sizes and shapes can also be drilled or punched to accommodate mechanical elements related to other electrical parts such as cylindrical shapes which can accommodate coils to form an induction coil . For those components that require bases, appropriate openings are made in the plates at the appropriate locations so that separately manufactured bases can be used and attached to the plate. If the plate is to accommodate other assemblies such as potentiometers or to be attached to a chassis, it is common for flanges to be attached to the plate to enable appropriate attachment.

However, the above-described known circuit boards have all proven to be disadvantageous in production, since the

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Manufacturing is associated with great effort and accordingly is expensive. The processing of the panels, in particular the making of fastening openings at predetermined locations has proven to be very difficult because if the openings are not positioned extremely precisely, the Loading the plate becomes difficult, especially when using automatic equipment. Furthermore the conventional method described above has also proven to be disadvantageous because an opening is not only must be positioned very precisely, but also their size must be kept within tight tolerances. Venn the opening is too small, it becomes difficult to insert an electric wire. However, the opening should be a If they are too large, the capillary action required for soldering is lost, so that a perfect solder connection is not possible arises. Besides, it is the traditional way of manufacturing of printed circuit boards so expensive because sockets, flanges and the like are made separately and then attached to the PCB must be attached.

The invention is based on the object of creating a printed circuit board of the type explained in more detail at the outset, which at the same time a particularly high level of accuracy with regard to positioning, with extremely low manufacturing costs its individual parts guaranteed.

The features laid down in the patent application serve in particular to solve this problem.

According to the basic idea of the invention, a circuit board is injected, cast, pressed or manufactured by an injection molding process or a similar process. This creates a connection between individual electrical components

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achieved that the circuit board with an electrically conductive Material such as copper is coated in a corresponding pattern, which establishes the connection between the individual electrical components.

Venn the circuit board according to the invention preferably after a Injection molding is produced, this enables extremely precise positioning of openings such as guide openings for the connecting lines of electrical components. It is also made possible to do so to provide openings in view of an easier introduction of connecting wires with a depression. Furthermore, components such as sockets, mounting flanges, coil forms, strap fastening elements and the like can be used as integral Component of the plate in a single piece with extraordinary precision and reproducibility in terms of Arrangement and dimensions are made.

The invention is described below, for example, with reference to the drawing; in this show:

fig. 1 shows a perspective bar position of a circuit board according to the invention,

Fig. 2 is a broken away partial view, which in section

a mounting opening and the base of an integrated circuit of the board according to fig. Λ illustrates, and

fig. 3 is a broken-away partial illustration showing, in section, the base connection for the arrangement according to FIG illustrated.

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You Fig. 1 illustrates a portion of a molded or molded circuit board 10 according to the invention. In a perspective illustration, there is a total of a first Circuit board 12 shown, which is shown together with a second circuit board 14 (which is only partially shown) produced in a common plate or pallet 10 by a pressing process, casting process or injection molding process is. A pair of break lines 16 and 18 are juxtaposed in panel 10 so that the first and second Circuit board 12 or 14 can be removed or broken off in a simple manner from the common plate or pallet. A plate construction or pallet construction in which a number of circuit boards are manufactured together, proves to be expedient because it allows the production of printed circuit boards with predetermined dimensions to be carried out with an optimal degree of efficiency can be. The above-mentioned plate principle or pallet principle enables the production of several circuit boards in one operation, so that the time-consuming method of manufacturing individual panels is avoided. Farther it is more economical to process a board with a standard size, for example in dip soldering or the like, in contrast to the processing of individual circuit boards. According to the invention, a pallet with predetermined dimensions can have various individual circuit boards, some or all of which are arranged on the same pallet, but may be designed differently.

For the person skilled in the art it should be obvious that a wide variety of Materials and manufacturing processes can be used to manufacture the circuit boards according to the invention. According to However, a particularly preferred embodiment is a Glass epoxy resin compound used in an injection molding process.

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Such materials and methods are known in principle.

It is a particularly advantageous feature of the invention that a printed circuit board, preferably produced by injection molding, is designed in advance in such a way that it can accommodate and Fixing electrical components is prepared. As will be explained in more detail below, the electrical components which are arranged on a printed circuit board according to the invention and attached that they over a line pattern formed from conventional material can be connected to one another, which is located on the underside of the Plate is made.

Many electrical components are provided with leads which extend from the components and which are usually attached to a circuit board with the help of openings, which are drilled through the circuit board or punched. According to the invention, however, as is shown for example at 20, fastening openings for the connecting lines of electrical components the manufacturing process of the printed circuit board itself. As a result of the excellent accuracy and the good reproducibility of a process such as an injection molding process the openings for the components can be arranged extremely precisely from one circuit board to the next, and it the size of an opening can be within very tight tolerances being held. This feature proves to be particularly advantageous when the electrical components are in the Printed circuit board with the help of automatic devices are to be used. Another advantage of the invention Circuit board consists in that the openings for the connecting lines of electrical components with a recess in the type of depression can be equipped. Such an arrangement is illustrated in FIG. 2, in which

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a resistor 24 is only partially shown, which has a connection line 26 which extends into the guide opening 20 is to be introduced. The guide opening 20 is as shown designed in such a way that it merges into the opening 20 via a depression, as a result of which the connecting line 26 of the resistor 24 can be inserted more easily into the opening 20. . The size of the opening 20 on the underside of the plate 12 is critical for two reasons. If the opening 20 is too small, the insertion of the connecting line 26 becomes difficult, and thereby the production becomes more expensive. If the opening 20 is too large, after inserting the connecting line 26 in the opening when soldering the capillary action may not be sufficient in terms of a sufficient Suck a sufficiently large amount of solder around the connecting line 26 around the solid soldered connection. In this way Inadequate electrical contact can result. In summary, it can thus be stated that by that According to the invention, the opening 20 is produced by an injection molding process or a similar process, at a printed circuit board 12 compared to conventional circuit boards significant advantages can be achieved in which corresponding openings can be drilled or punched. First of all, each opening on the plate is particularly precisely positioned. Farther the opening size retains its exact size on virtually all panels. Finally, the opening can be in this way be formed to have a depression or a taper, so that a lead can be inserted more easily can. All of these advantages are extremely essential to a reliable design while being economical to manufacture to ensure electrical circuits on electrical circuit boards.

While an example of a component is referred to a lead above resistor 24 should be apparent that numerous other electrical components with

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Connection lines also have the advantage of the invention Arrangement can make use of. Only capacitors, coils, crystals, diodes, etc. are mentioned as further examples.

A common element used on a printed circuit board is a coil. A typical spool has a core on which a winding of wire is arranged. It is known per se that the coil can be produced by having an opening of sufficient size is drilled or punched into the circuit board and then a coil with windings arranged on it is introduced into such an opening in a press fit. According to the invention, however, a coil shape such as shown at 30, directly and in the correct location with high accuracy on the circuit board at Manufacture like injection molding. Due to the precision of the manufacturing process, the coil shape can not only be positioned exactly with high accuracy, but it can also be positioned with high accuracy with the correct Inside diameter and the correct outside diameter. When the coil is matched with the help of a core is to be, the inside of the coil form 30 with a corresponding Hippung or a corresponding thread so that the core can be positioned in the desired manner.

It is often useful that the circuit board has a flange, with the help of which a component can be attached to the plate. Such a flange can also be used for this purpose be able to attach the circuit board to another component. This is often due to the prior art happen that a metal flange was soldered to the circuit board or by mechanical means with the help of a screw and a cutter was screwed on. As can be seen from the illustration in FIG. 1, the circuit board according to the invention can

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have molded paddles, two of which at 32 and 34, respectively are shown. These flanges are in the production of the circuit board, for example in an injection molding process. has been molded. This means that the desired flanges with the circuit board 12 form a single piece. The one at 32 The flange shown is intended to be used for fastening the circuit board 12 to another component such as a chassis, with conventional components such as nuts and bolts can be used.

The flange shown at 34 is an example of an arrangement to which another component can be attached. For example, a potentiometer, indicator lamp, switch or other component could be attached to the flange by attaching it to the flange 3 ^ with the aid of the fastening holes 36. There is no need for a closer one An indication that the openings can be made with high accuracy and are of any desired size have, since the openings 36 are made together with the flange 3 ^.

In the manufacture of conventional printed circuit boards, it is often desirable to include sockets in the board record electrical components. This is done in a conventional manner by making openings of suitable size in the plate were drilled or punched, which were designed in their shape and size such that a base fitted which was previously manufactured independently of the printed circuit board. Vie also emerges from FIG. 1, For example, the base 38 can be produced as an integral part of the circuit board 12. In this case, the base 38 is used to accommodate integrated circuits which are parallel Have rows of pipes. It will be observed that the base 38, as well as other parts made with the plate 12, are accurately positioned on the plate

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4%

can be positioned. The openings in the Sockets 38 are formed, are arranged very precisely, so that a smooth and reliable insertion of the integrated circuit is guaranteed.

While commercially available electrical contacts can be inserted into socket 38 to provide an electrical To make contact with the integrated circuit, a more economical method is shown in FIG. There, the base 38 produced according to the invention is shown in FIG Figure 3 illustrates a broken away view showing two openings 40, each of which has a clamp one integrated circuit. The circuit board is designed in such a way that it comprises a conductive material such as copper, which electrically connects the individual components. There are several in the industry Known methods are available to make metallic pipe connections to manufacture on printed circuit boards. In one known method, the entire circuit board is for example provided with a copper layer. Then the copper becomes selective with the help of a photoresist process etched away so that the desired circuit configuration remains. Another known method is used the application of an adhesive in a correspondingly precise arrangement on the plate, so that copper on this adhesive adheres, after which the adhesive is coated with copper. In principle, further methods are known to the person skilled in the art.

According to the illustration in FIG. 2, the copper layer denoted by 46 can extend around the openings 40, so that an electrical connection between the lines of an integrated circuit and the other components the circuit board is created without additional connections

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be used. This leads to a very reliable, but extremely inexpensive possibility of components such as integrated circuits, transistors, etc. to be attached to the circuit board.

Furthermore, in Fig. 1 is a line strip or connecting strip 50 which forms an integral part with the circuit board 12. The connection circuit or connector circuit 50 may be a number of plug-in sockets record, and it can continue, for example, because it is produced in an injection molding process, any size, Shape and arrangement on the plate 12 have. A broken-away representation of the connection 50 is illustrated in FIG. 5. According to this illustration are in the terminal strip 50 a Series of indentations, one of which is indicated at 52 is. A channel 54 is arranged at the base of the recess, which leads to the copper layer 46, which is attached to the underside of the plate. The recess 50 is such produced, preferably in an injection molding process, that it has a suitable shape and size to a predeterminable Number of commercially available pins and / or sockets, which are simply inserted into the recess 52 can and be held in place by friction while the board is soldered or similarly machined so that the pin or socket is thereby connected to the metal, preferably made of copper, as at 46 will.

A number of other openings and extruded parts such as a ribbon connector 60 are shown in FIG. 1, which is only a small selection of a variety of other forms represent which the circuit board according to the invention can accept to accommodate electrical components or the like.

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e e r s e i f e

Claims (1)

Claims Electrical circuit board, characterized in that the electrical circuit board (12) as a Pressed, cast or injection-molded or the like manufactured circuit board is formed, which in a substantially planar configuration (20, 30, 32, 34, 36, 38, 49, 50, 52, 54, 60) for receiving and fastening predeterminable electrical components (24) are provided and that the printed circuit board continues to be designed in this way is that it receives a pattern (46) of conductive material which serves to conduct the attached electrical To arrange components in a desired circuit configuration. Printed circuit board according to Claim 1, characterized in that at least one of the electrical components (24) is elongated Has connecting lines (26) which are designed such that they can be inserted into a receiving base are, and that the plate has a base arrangement (38) molded on or molded in some other way, which is used to accommodate the lines of the electrical components. 3. Printed circuit board according to claim 2, characterized in that the molded-on base (38) is designed in such a way that it receives a conductive material (40) so that when the lines of electrical components in the socket are used, electrically conductive material comes into contact with it in order to establish the electrical connection connection. 809809/0711 4. Printed circuit board according to claim 1, characterized in that at least one of the electrical components is a coil which has a core and a winding part wound thereon, and in that the plate has a core (30) which is one piece with the plate and which is predetermined in this way Has dimensions that the winding part can be arranged thereon, so that in this way the desired coil is to be formed. 5. Circuit board according to claim 1, characterized in that in conjunction with similar boards, all printed circuit boards form an integral part and on one single plate or pallet (10) are arranged. 6. Circuit board according to claim 5, characterized in that break lines (16, 18) are provided on the plate or pallet are, at predeterminable points with respect to the individual circuit boards, so that the individual Printed circuit boards can be easily separated from the common plate or pallet. 809809/071 1