DE2828146A1 - ELECTRIC PCB - Google Patents

Description

Dipl.-Phys. O.E. Weber d-s Munich

Patent attorney Hofbrunn & tcaßa. ^,

Telephone: <089) 7δ15050

Telegram: monopoly weaver munich

710

HOIK) EOLA IHG. East Algonguin Bead Sdaatuaburg, 111. 60196 United States

Electric! Circuit board

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ORIGINAL INSPECTED

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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 the manufacture of a board for a printed circuit »

The present invention is a further development of the subject matter of German patent application P 27 34 · 819 · 2.

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. Machining the board involves drilling or punching holes at predetermined locations on the board 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 . Ii ¹ Ur such devices which require socket, corresponding openings in the plates at the appropriate places to be attached, so that the base can be separately prepared werden- inserted and fixed to the plate. When the panel is to accommodate other devices such as potentiometers or is to be attached to a chassis, it is common for flaps to be attached to the panel to allow for appropriate attachment.

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The known printed circuit boards described above have proven to be disadvantageous in terms of production, however, since production is associated with great effort and is correspondingly expensive. The processing of the plates, 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 assembly of the plate becomes difficult, especially when using automatic devices. In addition, the conventional method described above has also proven to be disadvantageous because an opening must not only be positioned very precisely, but its size must also be maintained within narrow tolerances. If the opening is too small, it becomes too difficult to insert an electrical wire. However, if the opening is oversized, the capillary action required for soldering is lost, so that a perfect soldered connection is not created. In addition, the conventional way of manufacturing circuit boards is expensive because sockets, flanges and the like must be manufactured separately and then attached to the circuit board.

The invention is based on the task e, a printed circuit board of the type described in more detail at the beginning, in which by appropriate shaping and dimensioning a particularly versatile application with regard to different components is required.

The patent application in particular serves to solve this problem laid down characteristics.

The invention preferably provides that a printed circuit board is injection molded, cast, pressed or by an injection molding process or similarly made such that it

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has a non-planar configuration in order to be attached to the appropriately shaped places special components in "in a particularly advantageous manner. A connection between individual electrical components is produced in that the circuit board according to the invention with an electrically conductive material such as copper in one corresponding pattern is coated, which establishes the connection of the individual electrical components.

If the circuit board according to the invention is preferably after an injection molding process is produced, an extremely precise positioning of openings such as Suhrungs openings for the ita connection lines of electrical components guaranteed at precisely specified locations. Furthermore, it is made possible to have such openings with regard to easier introduction of inclusion wires with a depression to provide. Furthermore, components such as bases, mounting flanges, coil shapes, sand mounting elements and the like as integral parts of the plate in a single piece with extraordinary precision and prodnceability made with regard to jto.ordo.ung and dimensions will"

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

J ¹ Ig- i a perspective view of a conductor plate according to the invention

Prop. 2a is a broken-away partial representation showing, in section, a fastening opening and the base of an integrated circuit of the board according to S ¹ Ig. i illustrates

J ¹ Ig. 2b is a broken-away partial representation showing, in section, an alternative construction for a fastening opening and the base of an integrated circuit of the board according to S ¹ Ig. Λ illustrates

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Fig. 3 is a broken away partial representation, which in section the base connection for the arrangement according to Fig. 1 demonstrates,

J ¹ Xg. 4- a component holder, which ensures that a component is held at a predetermined distance above the circuit board,

Prop. 5 a component heat sink, which is connected to the circuit board forms a piece,

Mg. 6 a preferred embodiment of a coil core and a shielding holder,

7 shows a module circuit board which is for permanent attachment to the circuit board according to the invention suitable is,

8 shows a slide-in or plug-in circuit board arrangement, which has contacts that allow removal, and

Pig. 9 shows an injection molded circuit chassis plate in combination with a radio housing.

The I ¹ Xg. 1 illustrates a portion of a molded or molded circuit board 10 in accordance with the invention. In a perspective view, a first circuit board 12 is shown, which is produced together with a second circuit board 14 (which is only partially shown) in a common plate or pallet 10 by a pressing process, casting process or injection molding process. A pair of break lines 16 and 18 are adjacent

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arranged in the plate 10, so that the first and second circuit boards 12 and 14 in a simple manner from the common Plate or pallet can be removed or broken off. A panel construction or pallet construction in which a number of printed circuit boards are produced together, proves to be expedient because this results in the Production worked with an optimal degree of efficiency in the production of printed circuit boards with given dimensions can be. The above-mentioned plate principle or pallet principle enables the production of several circuit boards in one work step, so that the time-consuming method of manufacturing individual panels is avoided. Farther it is more economical to process a plate with a standard size, for example for dip soldering or the like, in contrast to the processing of individual printed circuit boards. According to the invention, a pallet with predetermined Dimensions have different individual circuit boards, some or all of which are arranged on the same pallet are, but can be designed differently.

It should be obvious to me as an expert that the most varied Materials and manufacturing methods can be used to manufacture the circuit boards of the invention. According to however, in a particularly preferred embodiment, a glass epoxy resin compound is used in an injection molding process. Such materials and methods are known in principle.

It is a particularly advantageous feature of the invention that a printed circuit board preferably manufactured by injection molding is designed in advance in such a way that it is prepared for receiving and fastening electrical components. As will be explained in more detail below, the electrical components which are based on an inventive

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Printed circuit board are arranged and secured that they are formed by a conventional material line pattern with each other which is made on the underside of the plate.

Many electrical components come with connecting leads provided, which extend from the components and which usually with the help of openings on a circuit board which are drilled or punched through the circuit board. According to the invention, however, how it 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 good reproducibility a process such as an injection molding process, the openings for the components of a circuit board to the next can be arranged extremely precisely, and it can be the size of an opening within very tight tolerances being held. This feature proves particularly advantageous when the electrical components 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 a resistor 24 is only partially shown, which has a connection line 26 which extends into the junction 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 into the opening 20 more easily. The size of the opening 20 on the underside of the plate 12 is

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critical for two reasons. If the opening 20 is too small, the insertion of the lead 26 becomes difficult, and thereby the production becomes more expensive. When the opening 20 to is large, after the insertion of the connecting line 26 into the opening "during soldering, the capillary action under certain circumstances not be sufficient for a sufficiently large amount of solder in view of a sufficiently strong solder joint to suck in the connecting line 26 around. This can result in insufficient electrical contact. One alternative embodiment of the component fastening opening is shown in Mg. 2b. Here the opening is equipped with ribs 28 which serve to hold the clamps to grasp and hold a component through friction. The ribs 28 "provide an excellent means of keeping the Manufacturing process to hold a component in place, if "for example other parts for subsequent Soldering can be installed. In addition, the ribs center the lines within the mounting holes, thereby causing a controlled capillarity effect for the solder around the lead, thereby creating a excellent solder joint is created.

In summary, it can thus be stated that, according to the invention, the opening 20 is made by an injection molding process or a similar method is produced in a printed circuit board 12 versus conventional circuit boards considerable advantages can be achieved in which appropriate openings are drilled or punched. First is namely each opening on the plate is particularly precisely positioned. Furthermore, the opening size remains the same for practically all panels their exact size bsi. Finally, the opening can be designed in such a way that it has a depression or a taper has, so that a connection line can be inserted more easily. All of these advantages are extraordinarily essential,

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in order to have a reliable construction with economical production electrical circuits on electrical circuit boards to ensure.

While a resistor 24 is mentioned above as an example of a component with a connecting lead, it should be obvious be that numerous other electrical components with connecting leads also benefit from 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. Because of Due to the precision of the manufacturing process, the coil shape can not only be precisely positioned with high accuracy, but it can also be equipped with the correct inner diameter and the correct outer diameter with high accuracy will. When the coil is matched with the help of a core is to be, the inside of the coil form 30 with a corresponding Eippung or a corresponding thread can be equipped, so that the core in the desired manner can be positioned.

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

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will secure the circuit board to another component to ". This is often _(done according to the prior art in that a metal flange is soldered to the circuit board or has been screwed by mechanical means using a screw and a nut. As seen from the representation 1, the circuit board according to the invention can have molded-on flanges, two of which are shown at 32 and 34. These flanges are molded on during manufacture of the circuit board, for example in an injection molding process A single piece of circuit board 12. The flange shown at 32 is intended to be used to secure circuit board 12 to another component such as a chassis using conventional components such as nuts and bolts.

The flange shown at 34- is an example of an arrangement to which another component can be attached. For example, a potentiometer, a Indicator lamp, a switch or another component can be attached by attaching it to the flange 34- with the aid of the attachment openings 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 34- will.

In the manufacture of conventional printed circuit boards, it is often desirable to accommodate sockets in the board, which record electrical components. This is done in a conventional manner by making openings of suitable size in the plate can be drilled or punched, which were designed in their shape and size such that a base fitted that was previously independent of the circuit board

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manufactured vnirde. As can also be seen from FIG. 1, the base 38 can be an integral part of the circuit board 12 can be produced. In this case, the base 38 is used to accommodate integrated circuits which are parallel Have straining lines. It will be observed that the base 38 as well as other parts made with the plate 12 can be positioned on the plate with high accuracy. 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 form contact with the integrated circuit, a more economical method is shown in FIG. 2a. There, the base 38 produced according to the invention is shown in FIG a broken away view illustrates which shows two openings 4-0, each of which receives a terminal of an integrated circuit. The circuit board is like this designed that it comprises a conductive material such as copper, which the individual components electrically with each other connects. Various known methods are available in the industry for making metallic wiring connections on printed circuit boards. at According to a known method, the entire circuit board is provided with a layer of copper, for example. After that, will the copper is selectively etched away using a photoresist process 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.

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According to the illustration in FIG. 2a, the one designated by 46 " Copper layers extend around the openings 40 so that an electrical connection between the lines an integrated circuit and the other components on the circuit board is created without additional connections 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 the Pig. 1 a conductor strip or connecting strip en 50 which forms an integral part with the circuit board 12. The connection circuit or connection circuit 50 can receive a number of plug-in sockets, and it can continue to be, for example, in an injection molding process, have any size, shape and arrangement on the plate 12. A broken one Representation of the connection 50 is illustrated in FIG. 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 an edge fitting 60 are shown in FIG. 1,

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which is only a small selection of various other forms represent, which adopt the circuit board according to the invention can to accommodate electrical components or the like.

The Pig. 4 illustrates, for example, a molded one or otherwise molded bracket 60 for a capacitor 62. It is "known that the distance between a Capacitor body and the circuit board to which it is "attached" creates a parasitic capacitance, which is the effective Capacity of the capacitor changed. Therefore, in known arrangements, the lines from the capacitor are precisely specified Places cranked or crimped, which enables the capacitor to be inserted into the plate up to the crank is, so that thereby the distance between the capacitor and the circuit board is exactly maintained and on this will ensure a proper capacity value. By molding the bracket onto the circuit board or is formed in another way, this distance can be kept at any desired value, with high accuracy and high reproducibility, so that the relatively complex additional work step there is no need for cranking or crimping. Thus, according to the Fig. 4 shows the bracket 60 accurate positioning of the capacitor and allows the condenser leads be received in opening 64 ·.

FIG. 5 illustrates a circuit board having a transistor heat sink 72 disposed therein. The heat sink 72 may consist of a standard heat sink material such as aluminum and may be equipped with cooling fins 74 as shown be. Around the heat sink 72 within the circuit board 70 determine, it is possible that various openings, as shown in part as opening 76, at predetermined

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Places in the heat sink 72 are attached so that at During the manufacturing process, the material penetrates the openings like a plastic material, thereby creating the heat sink clamped in place. A suitable slot, such as slot 78, could be in the circuit board are provided, so that thereby a direct heat sink connection between the component, in the present Pail the Transistor 80, and the heat sink 72 is formed. Thus made possible this construction involves making connections between the leads 82 of the transistor and the other parts of the circuit in a convenient way and at the same time ensures a sufficient heat sink for the transistor,

Fig. 6 is a partial section through a coil and a shield for this coil. As in FIG. 1, a coil shape 80 is molded onto the circuit board. The coil turns slide over mold 80 with conduits 84 extending through openings 86 provided at appropriate locations. In the prior art, metal caps were used to surround and shield the coils. In the case of the one shown in FIG Embodiment, the circuit board has an integrally formed shield holding portion 88, which with the circuit board forms one piece and surrounds the coil shape. The shielding can be achieved by applying a metal layer 90 µm the shielding bracket 88 are carried out around and further in that a metal cover 92 is placed on the coil form 80 in the manner becomes that it is locked to the bracket 88. It is preferably provided that the metal cover or the Metal coating 90 in the same manufacturing step as Attachment of the metal areas in the printed circuit board is made. Thus, the metal cover with a desired circuit potential as connected to ground. By simultaneously connecting the shield bracket to the Printed circuit board is produced, there is a considerable saving in production time, and thus the Costs can be reduced significantly.

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Furthermore, the inside diameter can also have threads be provided so that a tuning core 94 are received can. Alternatively, the inner surface of the mold 80 can be tapped through the inserted core be.

Figure 7 illustrates a preferred embodiment of the subject matter of the invention, in which the molded circuit board 100 has slots 102 which are used to hold holding parts or fastening flanges 103 of a second printed circuit board 104 to receive, which can also be produced by injection molding or in a similar manner. The circuit board 100 is equipped with metal areas, one of which is marked at 106, which is after receiving the flanges the second printed circuit board 104 is brought to coincide with detail areas in such a way as 108 in the case of the second printed circuit board, that contact is made. In this preferred embodiment of the subject invention, each metal region is the Circuit board, for example the area 106, is coated through the slot 102 and can be on the opposite side the plate extend. In this way, an electrical and a mechanical connection between the plates 100 and 104 can be brought about simply in that the plates are soldered together in such a way that solder ridges arise (e.g. 106, 108), namely under the plate and above the plate, by taking advantage of capillary action the slot 102, thereby creating the desired electrical connection.

FIG. 8 illustrates the module of FIG. 7 in a form in which it is designed as a plug-in unit. Here is the circuit board 110 with a receiving slot 112 and with corresponding contact fingers, one of which is shown at 114. Each finger is electric with the

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Metal areas connected, one of which illustrated at 116 is. A rear mounting guide 118 is also shown in this figure. When inserting the flange 120 of the second plate 122 into the slot 112, each corresponding finger 114 comes in mechanical and electrical Contact with corresponding areas of detail which are formed on the second plate, "for example with a metal area 124. In this way there is both an electrical and a mechanical connection between the two plates 110 and 122 brought about.

FIG. 9 illustrates a further development of the basic idea according to the invention up to the point at which a complete electronic component such as a radio or a radio device can be constructed from two basic components. In this figure, a chassis plate 1JO is shown, which is held in an injection-molded, cast or similarly manufactured circuit housing 132. Preferably, it is provided that the chassis plate 130 has various sockets, coil shapes, line openings, etc. formed therein, so that a holder is thereby formed for the electronic components which are contained in the arrangement. The housing 132 is suitably sized and shaped so that the chassis plate 130 can be housed and secured therein.

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Claims (8)

28281A6 Claims Electrical circuit board according to patent (German Patent application P 27 34 819.2-34), thereby g e k e η η ζ e i chnet that a larger surface area is designed to accommodate predetermined electrical components, in such a way that certain holding areas or fastening areas (30, 32, 34 »38, 50) from the Plate surface that at least one of these areas rise as a base area forming one piece with the plate (38, 50) is formed, the openings (40, 52) to directly contact lines of an electrical Take up component that the circuit board is further formed such that thereon a pattern of a electrically conductive material can be applied to establish an electrical connection between predetermined components to be able to produce in a desired circuit configuration. 2. Circuit board according to claim 1, characterized in that the base is designed such that it has a conductive material within the openings, so that when Insertion of electrical components into the base the conductive material with the contact lines electrical Components comes into electrical contact in order to establish an electrical connection therewith. 3. Circuit board according to claim 1, characterized in that at least one of the electrical components is a coil, which requires a core and has a winding portion to be wound around the core and that the plate has a molded core of predetermined dimensions so that the winding for making the coil is wound around it can be. 8Ö98U / G742 ORIGINAL INSPECTED 4-. PCB according to. Claim. 1, characterized in that the plaibes in a combination arrangement with others similar plates (14-) is arranged, with all plates are combined into a single pallet. 5. Circuit board according to claim 1, characterized in that a heat sink (72) for receiving a component is formed on the plate. 6. Circuit board according to claim 1, characterized in that the circuit board with an injection-molded, cast or housing (132) manufactured in a similar manner a unit is combined, wherein the housing is designed such that it receives and holds the circuit board. 7. Electrical injection-molded circuit board, which has a larger surface area that can be specified for receiving electrical components are used that are attached to the plate, at least one of the components being a coil, which has a core portion and a winding around the core, characterized in that the printed circuit board has an integrally molded core (50) which has predetermined dimensions and is designed in such a way that the winding of the coil can be wound around the core to form an induction coil. 8. Circuit board according to claim 7i, characterized in that furthermore an integrally molded shield is provided around the coil which is designed such that a shielding material is received and held. 9 holder for an electrical circuit, characterized that an injection molded, cast or similarly manufactured chassis (130) is provided, which is designed such that it has a larger surface area. 809804/0742 2828U8 has to accommodate specified electrical components which are also attached to it, so that the chassis continues to be designed in such a way that it consists of a pattern having conductive material to interconnect the components in a desired circuit configuration, and that there is an injection molded, cast or similarly manufactured housing (132) which is designed to receive and hold the chassis. 809884/0742