DE10048873B4 - Method and device for producing a multilayer structure for a printed circuit board - Google Patents

Abstract

method for producing a multilayer structure for a printed circuit board, in which an insulating coating of liquid, hardenable Insulation material on at least one side of a base plate (5) is rolled, a film (7) of conductive material on the still not cured, in particular liquid, insulation material forming a conductor material coating on the respective Insulation coating is rolled, the insulation material of the respective insulation coating, thereby fixing the conductor material coating hardened is, in the respective conductor material coating a conductor structure is formed, and the previous steps to reach a desired one Number of layers are repeated, the base plate (5) for coating with the insulating material on a respective coating roller (21) and for coating with the film (7) on a respective film applicator roll (6) in vertically hanging Position is transported past.

Description

The The invention relates to a method for producing a multi-layer structure for one Printed circuit board and an apparatus for producing a multi-layer structure for one Printed circuit board.

at For example, in the manufacture of multilayer printed circuit board structures using a printing process on an insulating sheet formed electrical circuits. For the production of the individual Layers of the printed circuit board is usually a Kupferkaschierte, thin insulating plate made of, for example, epoxy resin-based kraft paper. These will be according to the desired line trains with acid-fast Lacquer (photoresist) printed. The non-printed parts of the copper layer be with acid etched.

It is possible, too, an insulating plate corresponding to the conductor tracks with a conductive paint to print and then the ladder trains the conductive one Galvanically reinforce the lacquer. at the production of multi-layer structures for a printed circuit board currently mostly single inner layers made, which consists of a double-sided copper-clad Base material exist. The desired printed circuits corresponding interconnect structures are made of the copper material etched out by photochemical methods.

Subsequently, several must Inner layers with an intermediate layer of, for example, synthetic resin with corresponding insulating properties to a multi-layer structure pressed become.

At the However, pressing the individual inner layers there is a risk that the individual Shift layers. Therefore, in the aforementioned method, a complex centering of the individual inner layers required. In addition, during the Pressing air inclusions which leads to instabilities can lead the multi-layer structure of the printed circuit board.

at The formation of the individual inner layers, it is also possible, a special photosensitive paint simultaneously as an insulating layer and then chemically metallize the next metal layer applied on the turn applied to the special photoresist becomes. However, such photosensitive paints have so far been inferior Insulating properties as intended solely for the insulation Insulating material. To with the insulating photoresist the same insulating effect as To achieve with special insulating material, therefore thicker paint layers to be applied, which is undesirable larger layer structures leads. Furthermore exists between these special photoresists and the ones applied to them Metal layer also poor adhesion, so that there is a risk that conductor structures from the insulating photoresist replace, which leads to errors and uselessness of the product. These Overall disadvantageous properties of the insulating photoresist result from this a compromise between represent sufficiently good photo, insulating and adhesive properties.

The US 6,103,135 discloses a method for producing a multilayer laminate of a plurality of individual laminates, wherein a film of masking material is rolled on both sides of a base film.

The US 4,087,300 discloses a method for producing a laminate with a metal foil and a resin substrate, the metal foil is pre-coated with an adhesive layer and then passed with the substrate through a nip to thereby laminate the foils together.

The US 5,638,597 discloses a method for producing a flexible printed circuit board, wherein a polyimide core film is provided, to which a first adhesive film is first applied on both sides, on which in turn a copper layer is then applied. In turn, an adhesive film is applied to the respective copper layer, on which in turn a copper layer is applied; On the latter copper layer, a polyimide film is applied, and then the layers are laminated together.

The GB 1,076,294 discloses an apparatus for continuously and automatically processing strip material, such as flexible sheet material, wherein the strip material is transported vertically through the process stations, such as a cleaning, coating, etching station, etc.

The DE 31 49 588 C2 discloses a method and apparatus for applying a coating to thin, rigid plates by means of applicator rollers having their surfaces provided with elastically deformable recesses and drying the applied coating composition, the plates being treated in a vertical position, and a coating station and a subsequent drying zone continuously run through.

The DE 32 01 880 A1 discloses a method for residue-free stripping of printed circuit boards.

The US 3,658,629 discloses a laminating apparatus for simultaneously applying web material to the opposite side of a panel. The laminator has a pair of spaced laminating rollers and a feeder means for feeding a panel between the rollers, wherein vacuum means are provided for holding the material on the surface of the rollers.

It An object of the invention is to provide a method with which in a simple way very thin Multilayer structures for Printed circuit boards with high accuracy and low error rate to produce are. It is another object of the invention to provide a device for producing a multilayer structure for a printed circuit board, with the on fast and thus cost-effective way a multi-layer structure for one PCB can be produced.

The The invention provides a method having the features of claim 1 and an apparatus having the features of claim 8 ready. Further embodiments The invention are described in the respective dependent claims.

at the method according to the invention for producing a multilayer structure for a printed circuit board is a Base plate at least on one side by means of a respective coating roller with an insulating coating of liquid, hardenable Provided insulation material. Subsequently, by means of a respective Film applicator roller a foil of conductive material on the still liquid Insulating material to form a conductor material coating applied to the respective insulation coating. The insulation material the respective insulation coating is then set under it the conductor material coating cured. Thereupon in the respective conductor material coating formed a conductor pattern. Both during the application of the insulating material as well as during the Applying the film, the base plate is transported vertically hanging. In particular, the base plate is along a continuous Transport path to the respective coating roller and the respective Foil applicator roller transported past.

at the method according to the invention is a good adhesion of the conductor material layer on the Isolation achieved in that the former with in the insulation layer hardened with becomes. By providing the insulation layer mainly for insulation is, can Materials with best insulating properties are selected. Applying the liquid Insulation material and the application of the film takes place in each case in a simple way by means of rollers, which also ensures the film safely and firmly on the insulating coating can be pressed. Due to the vertical Transport position of the base plate, the latter can be continuous at one conveyor suspended be transported. This eliminates a complicated feeding and Removal to or from different transport devices, thereby the production of the structure is very inexpensive feasible.

The Base plate must be sufficient be stable so that they are during the coating operations are not bends or does not break. Preferred is this one glass fiber reinforced Plastic plate with e.g. Epoxy resin provided as a plastic material. The base plate is also advantageously already one with conductor material laminated plate. This first conductor material layer can be, for example be applied by chemical metallization on the base plate, subsequently on it according to the above Last described method step formed a conductor pattern becomes. Then be then according to the method of the invention additional layers on the copper-clad base plate educated. To achieve different thicknesses of conductor layers, can be applied to the applied film, for example, in an intermediate step by means of a chemical process further conductor material depending on desired Layer thickness are applied.

A desired Number of layers of conductor layer and insulating layer is through corresponding repetition of the method steps described above achieved.

When Insulation material is preferably used synthetic resin, such as epoxy resin, with which good insulating properties are achieved, so that the insulating layers thinly formed can be.

Prefers be after the formation of the respective or the outermost Ladder structure connection holes between this ladder structure and at least one underlying Conductor structure formed in the multi-layer structure, wherein the connecting holes metallized under connection of the respective conductor structures.

Last is advantageously still on the outermost conductor layer one Insulating layer applied to the entire multi-layer structure outward shield out.

The Printed circuit board is preferably after the application of the film to cure the liquid Insulating material heated. With appropriate thermosetting Insulation material is thus a faster curing of the Insulation material achieved, so that the base plate faster the subsequent process step can be subjected to what overall leads to lower production costs.

The conductor material film used is preferably a metal foil, in particular a copper foil. Metal is due to its all-round uniform me chanical properties are insensitive to unintentional loads, which can result, for example, from malpositions of the coating apparatus caused by assembly tolerances. This metal is easy to handle as a film material. In addition, metal, in particular the advantageous copper, a good conductor.

The used in the device according to the invention Film applicator for the Production of a multilayer structure of a circuit board has a film applicator roll for applying a film to a plate on which film applicator roll is formed as a hollow roller, the having a perforated peripheral wall and in the area between a first circumferential location, which provided for applying the film Contact point of the film applicator roll with the plate corresponds or which is adjacent to this contact point, up to a second one Peripheral point, which is starting from the first circumferential point opposite to the direction of rotation of the film applicator roll, is evacuable.

The Hollow roller has in this case at least between the first circumferential location and the second circumferential location is in its longitudinal direction extending cylindrical hollow segment, which evacuates, i.e. can be provided with a negative pressure. In the film applicator according to the invention is thus the supplied Film sucked from the film applicator roll, which makes the film especially smooth against the roller and very accurate and with reduced risk across from Wave formations can be passed on to the base plate.

Further The rolling of the film itself is an uncomplicated application so that the construction overall cost-effective is feasible.

Prefers the second circumferential location is located at the location at which the film applicator roll is fed to the film to be applied to the plate. Thus, the film can already at its feed to the film applicator roll be sucked by the latter safely and wrinkle-free or crease-free.

Even though the hollow film applicator roll simply in total, and so too be evacuable between the first and the second circumferential location can, she is preferred exclusively between these two Peripheral points facing on the plate to be coated Page evacuable, so that the film is not accidentally on a undesirable Roller position is sucked, which is at a distance to the desired Film career lies.

For this For example, one may pass through the hollow film applicator roll extending therethrough, cylindrical axis at the first and the second circumferential location opposite Make sealed against the inside of the film applicator roll by sealing lips be in the longitudinal direction the hollow roller extend so that two are formed by separate, circular ring-shaped cavities, of which one is evacuable.

Prefers if a fixed shaped body is received in the film applicator roll, starting from the first circumferential location of the film applicator roll or adjacent thereto in the direction of rotation of the film applicator roll along the peripheral wall thereof sealing the same to the second circumferential location extends. This is achieved in a simple manner that the film is sucked in only in that area of the roller, starting out from the first circumferential location opposite to the roller rotation direction extends to the time circumferential location. The molding can For this purpose, for example, so close to the inner wall of the hollow cylinder extend that in the narrow gap formed thereby no sufficient negative pressure can arise to suck the film. The molding can also on its longitudinal side Front ends sealed against the hollow roller, e.g. by means of a Sealing lip. The molded body can also advantageously simultaneously as a sliding bearing for the hollow cylinder serve.

The Foil applicator roll is further preferred from the first circumferential location up to a third circumferential point, which starting from the first circumferential location in the direction of rotation of the film applicator roll, with an elevated Internal pressure acted upon. As a result, the film during application by additional (Air) pressure pressed against the plate, causing the roller applied contact pressure even stronger becomes. Thus, the film can still better, i. wave and wrinkle free, and be applied more securely to the plate. The molded body would become extend in this case from the third roller circumferential point, the preferred in the roll direction of rotation to the first circumferential location the film applicator roll is arranged adjacent. The seal between the negative pressure region and the overpressure region can e.g. by means of longitudinal the hollow roller extending sealing lips take place.

The Foil application device has according to an embodiment of the invention second film applicator roll, the first film applicator roll is formed according to and opposite to the same is arranged so that the plate simultaneously coatable on both sides with a foil.

In addition, at least one pair of pressure rollers is preferably provided, the following of the at least one film applicator roll and einan which are arranged opposite one another and which are intended to press the at least one film applied to the plate against the plate.

Of the Term "below" refers to this in the transport direction of the plate to be coated, i. those Direction in which the plate is transported past the respective film applicator roll. With the additional pressure rollers The adhesion and the exact application of the film to the plate even better guaranteed.

The Foil is preferably a metal foil, in particular a copper foil. As explained above is metal because of its homogeneous mechanical properties very uncomplicated to handle and therefore preferred as a film material. In addition, metal, and especially copper, is a good conductor, which is thus preferred as a conductor material.

The inventive device for producing a multilayer structure for a printed circuit board a plate coater for coating a plate with liquid, hardenable Coating material, which in turn is a coating roller for applying the coating material to one side of the plate having. The device according to the invention for producing a multi-layer structure also has a film applicator, which is a film applicator roll for applying a foil to one side of the plate, and a transporting device from which the plate is attached to the coating roller and on the film applicator roll for applying the liquid coating material or for applying the film with the respective roller in contact standing is transported past. The plate coater and the film applicator are as a vertical coating device or as a vertical film applicator with vertically arranged coating roller or vertically arranged Foil form roller formed. The transport device is such trained that of She grabbed the plate hanging vertically at its upper edge is hanging and in this vertically Position for coating on the coating roller or for application the film is guided past the film applicator roll.

With the device according to the invention can Plates of different format in faster and more accurate and thus flawless way with both liquid coating material as well as being coated with a film. The maximum plate format is only by the lengths the coating roller or the film applicator roll limited, while of it starting any smaller plates without adjusting the associated transport device are coatable. Because the plates can always be at the same height level kept transported past the rollers, the along the coating roller or the film applicator roller extending Plate part in its length to to the maximum length the coating or the film applicator roll arbitrarily variable is. In addition, by the plates guided by the transport device to the Coating roller and transported past the film applicator roll become, a more exact coating possible than when the transport e.g. by means of the rollers themselves.

Prefers The plate coater has a second coating roller formed on the first coating roller accordingly is and the opposite of the same is arranged, and the film applicator preferably has a second film applicator roll, the first Foil application roller is designed accordingly and the same opposite is arranged, making the plate evenly on both sides with liquid coating material or coatable with the film. In the case of no double-sided coating is provided, the coating roller and the film applicator roll advantageously counter-holders, preferably in the form of counter-rolls, opposite arranged for the Coating with liquid Coating material and the application of the film required To generate back pressure and to prevent the plate is bent or breaks.

Further the film applicator is preferably with a heater provided, which arranged the at least one foil application roller below is and from which the plate to the serving of the applied thereon liquid Coating material is heated.

Further For example, the plate coater is preferably arranged in front of the foil applicator and for applying liquid Insulation material provided on the plate. After the film applicator a second plate coating device is preferably arranged, formed according to the first plate coating device is and for applying liquid Photoresist on the from the film applicator onto the plate applied film is provided.

With this arrangement, the plates guided by the same transport device can repeatedly pass through the associated processing stations (coating devices and film application device) for carrying out the method steps according to the invention without having to be removed from the transport device. Here are. also an exposure apparatus and an etching apparatus, which are provided for forming the conductor pattern in the sheet-like conductor material, the art formed that the plates can be transported in the manner described by the transport device to these devices and away from them, without the plates must be removed from the transport device.

The Transport device can be designed, for example, as a transport vehicle be the side of the device for the implementation of the inventive method is moved along a transport path. The dolly can be provided with a support arm, on which a gripping device to attach the plate to be transported is arranged. Preferably, the Transport device, however, as a completely overhead transport device formed, which advantageously above those plant components extends, of which the plate is processed, such. B. the plate coating devices, the film applicators, the heating and exposure and metallization devices. The transport device preferably extends continuously from here a plate feeder out to a disk removal device out.

By the overhead arrangement of the transport device can monitor, Maintenance and / or cleaning work on the plate coater be performed without hindrance from the side. This will be Downtime of the plant is reduced, reducing the productivity of the plant is increased.

Around to enable safer that the Plate as possible unbound in the direction of the rollers and to other processing stations is transported, the transport device is preferably designed such that the Plate along its entire upper edge side of the transport device is taken. Grasping along the entire upper edge side however, not only is it an uninterrupted detection, but also one at intervals successive, selective detection along the entire upper edge side to understand.

Around feed or remove from the coating system faster plates to be able to are advantageously an automatic Plattenzuführ- and / or an automatic plate removal device is provided, of which Plates supplied to the transport device or be removed from this.

To an advantageous embodiment the Plattenzuführeinrichtung a disk insertion shaft on, through which the plate of the transport device is supplied. The plate insertion shaft is funnel-shaped upwards rejuvenated trained and flows immediately adjacent to the gripping devices of the transport device out. By passing through the plate through the tapered Shaft can any distortions or other unevenness of the plate at its from the transport device to be taken edge side to be straightened thus ensuring a trouble-free transition is guaranteed to the transport device. As a result, transport congestion and rejects are avoided.

The Transport device may be formed such that the respective Plate when attaching the transport device of the gripping devices gradually in the sense of the zipper principle along the upper edge of the plate is taken. However, to the Accelerate the overall production process and thus increase productivity the Plattenzuführeinrichtung and the transport device preferably designed such that the respective Plate when attaching to the transport device at the same time along the entire edge side the plate is gripped by the transport device. The same is preferred for the disk removal device with regard to the release of Plate provided by the transport device.

When Transport device come for example in rails guided trolleys with attached gripping devices in question. A preferred Transport device is however a circulating transport chain, at the chain links the gripping devices are mounted. The transport chain is a cost-effective means of transport, which also driven in a simple manner driven by a pinion is. The transport chain is preferably deflected over two sprockets, while otherwise in their longitudinal direction is freely movable stored. The driven sprocket and the Chain drive, which preferably as a speed-controlled electric motor is provided, are preferably in the disk removal device arranged. The driven sprocket is here installed fixed installed, while the other deflection sprocket for tensioning the chain as location adjustable in the plate feeder is provided.

The gripping devices can be designed as electronically controlled motor gripper, which open or close depending on the control. Preferably, simple mechanical gripping parts are provided as gripping devices, which are biased by spring force in the closing direction and can be opened by mechanical actuation. The simultaneous opening of a plurality of such mechanical gripping parts can be done for example by a bar, which is simultaneously pressed against several arranged on the transport chain gripping parts under opening the same. However, in order to ensure a faster production operation, the plate feed device and / or the plate removal device preferably has a parallel to the transport chain angeord Nete and with their speed circulating opener chain with attached to their members on pressure stamps. To open the gripping parts, the entire opener chain is pressed with its pressure punches against the gripping devices, whereby the spring-biased gripping parts of the gripping devices are opened via a mechanism. As a result, successive plates of the transport device can be supplied or removed from the conveyor belt in a constantly circulating conveyor chain, which reduces the production time for coated plates. The pressing of the opener chain can be done for example by means of an electric motor or by means of a pneumatic cylinder.

The Invention will be described below with reference to preferred embodiments explained in more detail with reference to the drawing.

In show the drawing:

1 FIG. 2 shows a schematic plan view of an apparatus for producing a multilayer structure for a printed circuit board, with a film applicator device and two coating devices, FIG.

2 a front view of one of the coating devices according to 1 with a transport device arranged above it, shown in cross-section,

3 and 4 each a cross-sectional view of a transport device of the device according to 1 according to an embodiment of the invention, and

5 a plan view of a coating apparatus according to another embodiment of the invention.

How out 1 can be seen, a preferred embodiment of the apparatus for performing the method according to the invention comprises a film applicator 1 , a plate coater 2a and another plate coater 2 B on.

Furthermore, the device for carrying out the method according to the invention has a transport device 4 on which in 3 and 4 is shown in a cross-sectional view and which in the transport direction (arrows A in 1 ) of a plate to be coated 5 above the plate coaters 2a . 2 B and the film applicator extends (see. 2 ). The film applicator 1 and the two plate coaters 2a . 2 B are each for double-sided coating of the plate 5 formed and have symmetrical to the plate transport direction (arrow A) on both sides of the plate 5 same components. The film applicator 1 and the plate coaters 2a . 2 B Therefore, for the sake of clarity, they will be described only with respect to their components on one side of the plate, the reference numerals sometimes being used alternately on device components on both sides of the plates for reasons of space 5 are arranged. The film applicator 1 and the plate coaters 2a . 2 B However, they can only be used for one-sided coating of the plates 5 be provided, with the device components on the non-coated plate side then simply omitted. That is, on the not to be coated side of the plate 5 arranged components of the film applicator 1 and the plate coaters 2a . 2 B to 1 fall away.

The film applicator 1 preferably has a film applicator roll 6 on, from which a foil 7 on one side of the plate 5 will apply. The foil applicator roll 6 is formed as a hollow roller having a perforated peripheral wall. In a longitudinal direction of the hollow cylinder 6 extending range 8th between a first circumferential location 9 the foil applicator roll 6 , which of the application of the film 7 provided Wälzkontaktstelle the film applicator roll 6 with the plate 5 corresponds to or adjacent to this contact point, up to a second circumferential location 10 extending from the first circumferential location 9 opposite to the direction of rotation (arrow B) of the film applicator roll 6 is, is the film applicator roll 6 evacuated. The foil 7 is from a foil roll 11 from unrolled and the foil applicator roll 6 fed. To accurately unroll the film 7 from the film roll 11 to ensure that is adjacent to this a film guide roller 12 arranged, which with the film roll 11 is in a rolling contact and against these movable and thus pressed (arrow C). This will make the film 7 through a gap 12 ' between the two rollers 11 . 9 in a smooth and uniform form of the film roll 11 unrolled.

Adjacent to the second circumferential location 10 the foil applicator roll 6 is a turn-on roll 13 arranged, by means of which the film applicator roll 6 supplied foil 7 to the film applicator roll 6 is laid smooth. The application roller 13 is therefore parallel to the film applicator roll 6 and arranged with this standing in the rolling contact.

In the foil applicator roll 6 is a fixed molding 14 taken up, starting from a third circumferential location 20 , in the direction of rotation (arrow B) of the film applicator roll 6 to the first circumferential location 9 is adjacent, in the direction of rotation (arrow B) of the film applicator roll 6 along its peripheral wall to the second circumferential location 10 the foil applicator roll 6 extends. This is the molded body 14 so close to the perforated peripheral wall of the film applicator roll 6 on, this peripheral wall of the molding 14 is sealed. This is the foil applicator roll 6 in the one from the plate 5 remote circumferential region between the first circumferential location 9 , which corresponds to that point at which the film on the plate 5 is applied, and the second circumferential location 10 sealed circumferentially, so that there is no suction effect in this peripheral region.

One from the plate coater 2a with liquid insulating material, such as liquid resin, coated plate 5 is determined by means of in 1 Not shown transport device 4 the film applicator 1 fed. In the process, the plate coated with the resin becomes 5 along the film applicator roll 6 transported. From the first circumferential point 9 the foil applicator roll 6 , from which the plate 5 with the on the film applicator roll 6 located foil 7 comes into contact, the plate is 5 with the foil 7 coated. The foil applicator roll 6 in the film applicator 1 arranged below is a plate guide roller 15 , From the plate guide roller 15 will provide an exact guidance of the plate coater 2a coated with liquid resin and by the film applicator 1 by means of the film applicator roll 6 with a foil 7 coated plate 5 ensured. The one with the foil 7 coated plate 5 becomes a first pair of pressure rollers 16 fed, which are opposite to each other along the transport path (arrow A) with the film 7 coated plate 5 are arranged. By means of the pressure rollers 16 will be the one with the foil 7 coated plate 5 Pressurized from both sides, leaving the film 7 on the plate 5 is pressed. The pair of pressure rollers 16 is preferably also provided when the plate 5 is only coated on one side, with one of the pressure rollers 16 then works as a pure counter pressure roller, which is not for immediate smoothing of the film 7 is used.

To improve the adhesion between the film 7 and the plate 5 can the film 7 at her the plate 5 be roughened contacting side. For example, in the case of a copper foil, this may be done by oxidizing the one surface of the copper foil which is attached to the plate 5 is created, be achieved. The foil 7 can also be roughened on both sides, so that a subsequently applied insulating material adheres well.

Towards the transport of the plate 5 through the film applicator 1 is the first pair of pressure rollers 16 below a heater 17 at least on that side of the plate 5 arranged on which the plate 5 with a foil 7 has been coated. By means of the heater 17 it is possible that by means of the plate coating apparatus 2a on the plate 5 applied resin, on which the film 7 was applied to heat and thereby the viscosity of the means of the plate coater 2a applied resin to a desired value.

Towards the transport of the plate 5 through the film applicator 1 are the heater 17 below one or more pairs of further pressure rollers 16 ' . 16 '' arranged, the already described above pair of pressure rollers 16 correspond. By means of the other pairs of pressure rollers 16 ' . 16 '' will both the adhesion between the film 7 and the plate 5 as well as the smoothness of the film 7 even further improved, ie with regard to the latter, undulations are reduced. Here, a secure pressing and adhering the film is also by means of the heater 17 set viscosity of the applied coating material (here resin material) reached. After the pressure rollers, the resin can by means of a not shown, such as the heater 17 hardened built-up heater.

The film applicator 1 also has a cutting device 18 with two knives 19 on. The respective knife 19 is to the associated film applicator roll 6 arranged adjacent and movable away to this and from this (arrow D). Here, the film 6 controlled to be cut off at a convenient time, so that the plate to be coated 5 is exactly coated to its rear edge seen in the transport direction. A corresponding cutting device 18 ' . 19 ' can also be seen in the transport direction after the film applicator 1 be arranged (shown by dashed lines) to one at the front edge of the plate 5 possibly protruding piece of the film 5 cut flush with the edge of the plate. By means of the cutting device 18 However, it is also possible on the plate 5 Cut off the film to be applied at another desired location. So that's on the plate 5 to be applied foil 7 be cut in several places, for example, on a plate 5 to provide several independent film areas. The cutting device 18 may instead of the knife 19 For example, also have a punch, with which the film is not only simply cut, but with the additional between the separated film part, the straight on the plate 5 is applied, and the remaining film 7 a greater distance is achieved, so that the remaining film 7 in a simpler manner flush with the front edge of the plate to be coated subsequently 5 can be created.

In transport direction of the plate 5 seen is the film applicator 1 the other (second) plate coater 2 B downstream, which are identical to the first plate coating contraption 2a is formed, which in the transport direction of the plate 5 seen before the film applicator 1 is arranged. By means of the second plate coating device 2 B A liquid photoresist or liquid photoresist is applied to the film 7 coated plate 5 applied. Subsequently, the plate 5 from the transport device 4 (please refer 3 and 4 ) are transported to corresponding devices for exposure and etching, whereby the conductor structure on the plate 5 is trained. After that, the plate can 5 from the transport device 4 optionally be transported to a drilling and metallizing apparatus, not shown, are made of the possibly connecting holes between the respective conductor structures and metallized, for example by filling with copper material. After that, the plate becomes 5 from the transport device 4 again to the first coating device 2a transported, from which it is again coated with liquid insulation material. According to the desired number of layers to be formed of the multilayer structure of an insulating layer-conductive layer circuit board, the plate becomes 5 accordingly repeated by the transport device 4 transported sequentially to the devices described above.

In the apparatus for performing the method according to the invention, which only on one side of the transport path of the plate 5 a film applicator 1 are, are with respect to the transport path of the plate 5 On the opposite side, auxiliary rollers are preferably arranged, similar to those of the film applicator 1 when applying the film 7 on the plate 5 counteract applied pressure, so that the plate 5 is almost unloaded and can not break.

The foil applicator roll 6 and the pressure rollers 16 . 16 ' . 16 '' are preferred toward their contact points with the plate 5 movably arranged so that they with variable pressure against the plate 5 are depressible. Likewise, the application roller 13 preferably in the direction of their contact points with the film applicator roll 6 movably arranged so that they with varrierbarem pressure against the film applicator roll 6 is depressible.

The plate 5 occurs, from the transport device 4 transported, on the film rollers 6 , which according to the embodiment according to 1 symmetrical to both sides of the transport path (arrow A) of the plate 5 are arranged in the film applicator 1 one.

The two film applicators 6 are each in the longitudinal area 8th extending circumferentially from the first circumferential location 9 from which of the Wälzkontaktstelle the plate 5 with the foil applicator roll 6 corresponds, opposite to the rolling direction of rotation to the second circumferential location 10 extending, which the Wälzkontaktstelle the film applicator roll 6 with the application roller 13 corresponds, evacuable. This makes it possible for the film 7 firmly on the surface of the respective film applicator roll 6 to keep.

A fixed molding 14 is in every foil applicator roll 6 arranged. The fixed molding 14 extends from the first circumferential location 9 the foil applicator roll 6 in the roll rotation direction along the peripheral wall of the film applicator roll 6 up to the second circumferential location 10 , From the fixed molding 14 is the foil applicator roll 6 between the first circumferential location 9 and the second circumferential location 10 sealed on the circumference. This makes it possible between the first circumferential location 9 and the second circumferential location 10 lying, the plate 5 remote area of the film applicator roll 6 seal, so that there is no suction effect. Furthermore, the film applicator roll 6 in the area between the first circumferential location 9 and the third circumferential location 20 extending from the first circumferential location 9 in the direction of rotation (arrow B) of the film applicator roll 6 adjacent to the first circumferential location 9 is located, be subjected to an increased internal pressure.

This makes it possible for the film 7 from the first contact point 9 the plate 5 with the foil 7 by the increased internal pressure in the film applicator roll 6 safer and more even to the plate 5 to apply.

The foil applicator rollers 6 arranged below are the mutually trained and along the transport direction of the plate 5 to this symmetrically arranged guide rollers 15 , By means of the guide rollers 15 It is possible to have an exact guide with the foil 7 coated plate 5 in the film applicator 1 along the transport direction of the plate 5 to ensure in the same.

Below the guide rollers 15 is, as explained above, the first pair of pressure rollers 16 arranged, of which the film 7 to the plate 5 is pressed to contact the foil 7 with that on the plate 5 To improve applied resin as well as to even out the layer thickness of the resin.

The first pair of pressure rollers 16 subsequently and symmetrically to the transport path arranged heaters 17 can be infrared radiators, for example. By means of heaters 17 it is possible to increase the viscosity of the plate by the coating apparatus 2a on the plate 5 applied and under the foil 7 with which the plate 5 by means of the film rollers 6 was coated to adjust existing resin. For example, while the resin by means of the heaters 17 be dried. However, it is also possible to liquefy the resin to pass through subsequent pairs of nip rollers 16 ' . 16 '' the contact between the resin and the plate 5 and / or the contact between the film 7 and the resin to improve and / or the layer thickness of the resin, which between the plate 5 and the foil 7 present, to be evened or adjusted.

Below with any further pairs of pressure rollers 16 ' . 16 '' provided film applicator 1 can, as explained above, a film-cutting device 18 ' be provided. The foil cutting device 18 ' is preferred with two symmetrical to both sides of the transport path of the plate 5 cutting blades arranged by the device for carrying out the method according to the invention 19 ' or the like cutting devices provided, each by means of a drive, not shown, in the direction of the plate 5 are movable to or from this away.

All rolls of the film applicator 1 are arranged parallel to each other and vertically, wherein for carrying out the coating operation, the plate 5 on an edge side of the transport device 4 taken in vertical hanging position is guided past the vertically arranged film applicator rollers.

The following will be the plate coaters 2a and 2 B as well as the transport device 4 explained. The plate coaters 2a and 2 B are formed corresponding to each other, so that they only by the example of the first plate-coating device 2a be explained in more detail, but also on the Platten Beschichtungsvorrichung 2 B corresponding reference numerals are provided.

The plate coater 2a according to 1 and 2 is designed as a so-called roll coater. It is also for double-sided coating of the plate 5 formed, on both sides of the plate to be coated 5 has to this symmetrically arranged, corresponding components. Therefore, the plate coating apparatus becomes 2a further explained only with respect to their arranged on one side of the plate components.

The one on the other side of the plate 5 arranged components of the plate coating apparatus 2a at the same time serve as a counter-holder, so that when coating the plate 5 on this applied pressure does not damage the plate 5 leads.

The plate coater 2a - And thus the plate coating device 2 B - Has a rotary-driven coating roller 21 which is arranged vertically and located at the point of contact with the plate to be coated 5 moved in the transport direction. The coating roller 21 (or applicator roll) has a peripheral layer 22 made of a soft plastic, especially rubber on. This peripheral layer 22 is surface-structured on a microscopic scale such that the coating roll 21 the liquid coating material supplied to it by the feeding device explained below 30 better towards the plate to be coated 5 can carry. The liquid coating material is for the before the film applicator 1 arranged plate coating device 2a provided as a liquid insulating material, whereas the other plate coating device 2 B for applying liquid photoresist, ie photoresist, is provided.

The core of the coating roller 21 is made of a harder material than its peripheral layer 22 for example steel or one compared to the peripheral layer 22 harder plastic come into question. The coating roller 21 can also be completely made of the peripheral layer material. With the coating roller 21 are two completely formed of steel and also vertically arranged rollers 23 . 24 in such a plant that the two steel rolls 23 . 24 with the coating roller 21 roll off. In the 1 lower steel roller is as a stripping roller 23 , and those in 1 Upper steel roller is as Mitlaufwalze 24 intended. Instead of steel, the stripper can 23 and the idler roller 24 also from another material, eg. As plastic, which is harder than the material of the peripheral layer 22 the coating roller 21 is. The axes of rotation of the three named rolls 21 . 23 . 24 are arranged such that the connecting lines between the stripping roller 23 and the coating roller 21 and the idler roller 24 and the coating roller 21 make an acute angle, but with the stripping roller 23 and the idler roller 24 do not touch each other. The coating roller 21 has in contrast to the two steel rollers 23 . 24 a larger diameter.

Between the thus arranged rolls of the plate coater 2a (or the plate coating device 2 B ) becomes a gap 25 formed, the side of the three rollers 21 . 23 . 24 is limited.

At both steel rollers 23 . 24 abutting is a vertically arranged sealing roller 26 provided, which with the two steel rollers 23 . 24 rolls. The four rollers 21 . 23 . 24 . 26 of the roller coater are thus arranged parallel to each other. Of the Diameter of the stripping roller 23 is equal to the diameter of the idler roller 24 so that the two rollers 23 . 24 so in contact with the coating roller 21 and the seal roller 26 can turn, that there is no relative movement between the rollers 21 . 23 . 24 and 26 comes.

The seal roller 26 has an outer layer 27 from the material of the stripper roller 23 and the idler roller 24 softer material. In particular, as the outer layer 27 the seal roller 26 provided a rubber material, while the core of the sealing roller 26 also be made of steel. The seal roller 26 but can also be completely out of their outer layer material.

The seal roller 26 is so both against the stripping roller 23 as well as against the idler roller 24 pressed that gap 25 is fluid-sealed to the side. Further, the follower roller 24 such against the coating roller 21 pressed, that even between these two rollers to the side no liquid can escape to the outside. The four rollers 21 . 23 . 24 . 26 are at their lower end by a bearing plate 28 supported, which simultaneously against the ends of the four rolls 21 . 23 . 24 . 26 is sealed, so that a liquid-sealed receiving space 29 is formed, in which the on the plate 5 to be applied liquid coating material 30 is included.

According to the present embodiment, the coating roller 21 and the seal roller 26 provided with fixed axes, while the stripping roller 23 and the idler roller 24 in the direction perpendicular to the line connecting the axes of the seal roller 26 and the coating roller 21 are arranged adjustable. Thus, the follower roller 24 with optional contact pressure against the seal roller 26 and the coating roller 21 be pressed to achieve the required liquid seal. The coating roller 21 and the stripper roller 23 rotate in opposite directions so that they are at their mutual investment line in the outward direction of the receiving space 29 move. This allows the coating roller 21 in a simple way coating material 30 from the recording room 29 out to the outside to the plate to be coated 5 promote. The coating material 30 in this case from the surface of the coating roller 21 in the recording room 29 picked up and from the coating roller 21 via its rotational movement through the gap between the stripper roller 23 and the coating roller 21 conveyed to the outside and then to the plate 5 transfer.

By adjusting the contact pressure of the stripping roller 23 against the coating roller 21 It is determined how much coating material from the coating roller 21 from the recording room 29 is promoted; In this case: the greater the contact pressure, the less the coating roller can 21 promote the outside and the lower the layer thickness. The stripping roller 23 is like the idler roller 24 and the seal roller 26 , Smooth on its outer surface, so that they no liquid from the receiving space 29 with leads to the outside. With the adjustment of the stripping roller 23 It may also be a contact pressure change between the seal roller 26 and the stripper roller 23 come. To a resulting lack of sealing between the seal roller 26 and the stripper roller 23 To prevent the seal roller is in advance correspondingly strong against the stripping roller 23 pressed and / or rotate the stripper 23 and the seal roller 26 as well as in 1 shown in opposite directions so that they are at their connection line towards the receiving space 29 move. As a result, a return of the liquid 30 in the recording room 29 favored.

Due to the smooth outer surfaces of the stripping roller 23 , the co-roll 24 and the seal roller 26 and the contact point side yielding compared to the steel rolls 23 . 24 softer seal roller 26 , will be between these rollers 26 . 23 . 24 achieved a sufficient seal, so that no coating material 30 in between reaches the outside. If, however, liquid does penetrate to the outside, it will come from the bottom of the bearing plate 28 collected, which is designed for this purpose as a collecting container. The of the bearing plate 28 Trapped liquid is then returned via a return line 35 (please refer 2 ) returned to a reservoir, not shown.

The recording room 29 is via a connection line 31 connected to a pump, not shown, from the reservoir liquid coating material 30 over the line 31 in the recording room 29 promotes the material export through the coating roller 21 compensate. The connection line 31 is here in the lower bearing plate 28 attached, so nachgefördertes coating material from below into the receiving space 29 arrives. In the recording room 29 is also an overflow in the form of an overflow pipe 32 provided, which extends vertically and thus parallel to the receiving space longitudinal direction, is open at the top and down via another connecting line 33 is connected to the reservoir.

The in the recording room 29 absorbed coating liquid 30 can therefore reach the upper end 34 the overflow pipe 32 rise upwards, whereby with constant Nachförderung of liquid from the reservoir of the Liquid level in the receiving space 29 exactly to the height level of the end 34 the overflow pipe 32 is set. The overflow pipe 32 is preferably variable in length, so that different liquid levels in the receiving space 29 are adjustable. The adjustment of the length of the overflow pipe 32 can be stepped or stepless. Alternatively, in the overflow pipe 32 be provided closable openings through the opening according to other liquid levels can be adjusted. The transport device 4 (in 1 not shown) is above the plate coater 2a . 2 B and thus above the rollers 21 . 23 . 24 . 26 arranged. The plate 5 is from the transport device 4 seized on the edge, where for the optimal transport of the plate 5 required side edge is provided with a width of 6-12 mm.

According to the in 3 and 4 the embodiment shown is the transport device 4 as a circulating transport chain 37 provided, extending in the transport direction of the plate 5 over the coating devices 2a . 2 B and the film applicator 1 extends. At the chain links 38 the transport chain 37 are laterally gripping devices 39 attached. The respective gripping device 39 has a gripping part 40 in the form of a hook clamp, which z. B. from a hook-shaped bent sheet metal or plastic. The gripping part 40 is in a three-sided closed, right angle bent frame part 41 between the two free, parallel frame legs 41 ' and 41 '' arranged. It extends in its longitudinal direction between the two frame legs 41 ' . 41 '' and through them. The two frame legs 41 ' . 41 '' of the angle frame 41 are over a jetty 41 ''' connected to each other, which on one leg 43 ' a mounting bracket 43 is attached, which in turn with his second leg 43 '' through the chain link bolt on one of the chain links 38 is attached. The gripping part 40 is by means of a spring 42 biased so that it with its towards the one frame leg 41 '' of the frame part 41 bent down, a hook end 40 ' against this frame leg 41 '' is biased pushing. The gripping part 40 extends in its longitudinal direction perpendicular to the transport chain 37 ; Here is his hook section with the hook end 40 ' the transport chain 37 facing while his other end 40 '' from the transport chain 37 turned away.

The gripping part 40 is by pressing on his from the transport chain 37 opposite end 40 '' towards the transport chain 37 brought into the open position; then a plate 5 between the one frame leg 41 '' and the hook end 40 ' of the gripping part 40 guided and after subsequent release of the gripping part 40 by the spring force of the spring 42 between the hook end 40 ' and the one frame leg 41 '' clinging to the transport chain 37 can be attached.

4 further shows a cross section through a Plattenzuführeinrichtung 43 by means of which the plates 5 the transport device 4 can be fed.

Hereinafter, the Plattenzuführeinrichtung 43 an elongate in Transportkettenlängsrichtung Platteneinführschacht 45 on, immediately below the transport chain 37 is arranged and moving upwards towards the transport chain 37 tapered funnel-shaped.

Immediately at the mouth end 46 are the gripping devices 39 arranged so that the respective plate 5 from below through the introduction shaft 45 directly following these from the gripping devices 39 can be detected. The plate insertion shaft 45 is by two oppositely arranged, bent according to the funnel shape plates 47 . 48 educated. In the present embodiment, the two chain trains run 37 ' . 37 '' the transport chain 37 one above the other.

To open the gripping devices 39 is an opening device 49 in the form of an opener chain 50 provided on the chain links plunger 51 in the form of printing plates with two angles each 52 are attached. The opener chain 50 is parallel to the transport chain 37 running as well as horizontally arranged chain hoists 50 ' . 50 '' intended. It is complete, ie along its entire length, towards the transport chain 37 moved so (double arrow P) that the plunger 51 under opening the gripping devices 39 against their from the transport chain 37 opposite ends 40 '' be pressed. The length of the opening device 49 and thus (approximately) half the opening chain length correspond to the expected maximum length of a plate to be transported 5 , Thus, when feeding a plate 5 to the transport device 4 from the opening device 49 so many gripping devices 39 open that plate 5 at the same time along its entire upper edge 59 from the gripping devices 39 can be taken. By driving away the opening device 49 becomes the transport device 4 supplied plate 5 in the gripping devices 39 , as explained above, clamped and from then on the transport chain 37 towards the coating device 2a transported. The opener chain 50 preferably runs at the same speed as the transport chain 37 , so that the transport device 4 without stopping their transport chain 37 Plates can be fed.

The plate insertion shaft 45 tapers to a width that is less than or equal to the distance between the one leg 41 '' of the thigh frame 41 and the hook end 40 ' of the open gripping part 40 is. This ensures that the transport device 4 supplied plate 5 always disability-free in the gripping devices 39 can be introduced. If the plate 5 at its upper edge side 59 Faulting or other bulges, these are due to the funnel shape of the Platteneinführschachts 45 straightened and can due to the aforementioned width of the insertion shaft 45 never be greater than the above-mentioned distance between the clamping parts (legs 41 '' and hook end 40 ' ) of the gripping devices 39 ,

3 shows a section through the transport device 4 in the area of the coating device 2a , which, like, for example

2 it can be seen below the transport device 4 is arranged. How out 3 it can be seen, the upper run 37 ' and lower 37 '' Chain hoist of the transport chain 37 each in a support housing 53 . 54 of which in particular the lower chain hoist 37 '' on which the plates 5 hang down over its entire transport length away and supported against twisting. As a result, a more accurate guidance of the plates 5 achieved. To better support against twisting the chain 37 to achieve is the transport chain 37 formed as a double chain. The gripping devices 39 are on one side of the transport chain 37 fastened laterally by means of their bolts. The transport chain 37 is between those two link plates, the gripping devices 39 facing away, supported at the top and bottom and those chain pins between the two gripping devices 39 facing chain links are arranged, bottom supported. Thus, the transport chain 37 along their chain hoists 37 ' . 37 '' by two spaced, lower housing arms 53 ' . 53 '' respectively. 54 ' . 54 '' and an upper housing arm 53 ''' respectively. 54 ''' twisted sure. Below the transport chain 37 and the gripping devices 39 is a panel or cover 55 with a slot 56 provided by which the of the transport device 4 transported plate 5 extends. The costume 55 prevents particles from the transport chain 37 , such as lubricants, down to the plate 5 fall where they could lead to contamination of the coating. According to the embodiment according to 3 is directly above the slot 56 one on both sides of the plate 5 arranged brush 57 provided, which with the plate 5 at the upper edge side 59 in attachment and so is the slot 56 additionally seals against the escape of particles. This brush 57 is especially in the field of coating devices 2a . 2 B and the film applicator 1 arranged.

In 5 is a plate coater 2a . 2 B mapped according to another embodiment of the invention; Here are those parts which are also the previously described plate coating devices 2a . 2 B have, provided with the same reference numerals. From 5 apparent plate coater 2a . 2 B is intended for one-sided coating. The difference from the embodiments described above is that the coating roller 21 now no other coating roller, but a simple counter-roller 36 is arranged opposite. Between the coating roller 21 and the counter roll 36 a gap is formed through which the plate 5 from the transport device 4 is transported led.

Claims (18)

Method for producing a multilayer structure for a printed circuit board, in which an insulating coating of liquid, curable insulating material is applied to at least one side of a base plate ( 5 ), a film ( 7 ) is rolled from current conductive material to the not yet cured, in particular liquid, insulating material to form a conductor material coating on the respective insulation coating, the insulation material of the respective insulation coating is set under it setting the conductor material coating, in the respective conductor material coating a conductor pattern is formed, and the preceding Repeated steps until reaching a desired number of layers, the base plate ( 5 ) for coating with the insulating material on a respective coating roller ( 21 ) and for coating with the film ( 7 ) on a respective film applicator roll ( 6 ) is transported past in a vertically suspended position. Method according to claim 1, wherein the base plate ( 5 ) along a continuous transport path at the respective coating roller ( 21 ) and the respective film applicator roll ( 6 ) is transported past. The method of claim 1 or 2, wherein the insulating material Resin is. Method according to one of claims 1 to 3, wherein after the formation of the respective or the outermost conductor structure connecting holes between said conductor structure and at least one underlying conductor structure in the layer structure are formed, wherein the connection holes are metallized and thereby the respective conductors structures are electrically connected. Method according to one of claims 1 to 4, wherein after the Forming the outermost Ladder structure this conductor structure with an insulation coating is provided. Method according to one of claims 1 to 5, wherein the plate ( 5 ) after application of the film ( 7 ) is heated to cure the liquid insulating material. Method according to one of claims 1 to 6, wherein as a conductor material film ( 7 ) A metal foil, in particular a copper foil, is provided. Device for producing a multilayer structure for a printed circuit board, comprising - a plate coating device ( 2a ) for coating a plate ( 5 ) with liquid, curable coating material ( 30 ), which is a coating roller ( 21 ) for applying the coating material ( 30 ) on one side of the plate, - a film applicator device ( 1 ), which a film applicator roll ( 6 ) for applying a film ( 7 ) on the plate ( 5 ), wherein the film applicator roll ( 6 ) • is designed as a hollow roller, • has a perforated peripheral wall and • can be evacuated so that only in a peripheral region between a first surface line ( 9 ), which by the application of the film ( 7 ) provided contact point of the film applicator roll ( 6 ) with the plate ( 5 ) or adjacent to this contact point, up to a second generatrix ( 10 ), which, starting from the first generatrix opposite to the direction of rotation of the film applicator roll ( 6 ), a suction effect on the perforated peripheral wall of the film applicator roll ( 6 ) occurs to the outside, and - a transport device ( 4 ) from which the plate ( 5 ) on the coating roller ( 21 ) for applying the liquid coating material to the roller ( 21 ) is conveyed in contact and from which the plate ( 5 ) on the film applicator roll ( 6 ) for applying the film ( 7 ) with the roller ( 110 ) is conveyed in contact, - wherein the plate coating device ( 2a ) as vertical coating device with vertically arranged coating roller ( 21 ) and the film applicator device ( 1 ) as a vertical film applicator with vertically arranged film applicator roll ( 6 ), and - wherein the transport device ( 4 ) is formed such that from her the plate ( 5 ) at the upper edge side ( 59 ) is vertically suspended and in this vertically hanging position for coating on the coating roller ( 21 ) and for applying the film to the film applicator roll ( 6 ) is passed. Apparatus according to claim 8, wherein the second generatrix ( 10 ) passes through the point at which the film applicator roll ( 6 ) on the plate ( 5 ) film to be applied ( 7 ) is supplied. Contraption ( 1 ) according to claim 8 or 9, wherein in the film applicator roll ( 6 ) an elongate, fixed molding ( 14 ), which extends with its longitudinal direction along the film applicator roll ( 6 ) and by means of which that peripheral region of the film applicator roll ( 6 ), which is located on that of the plate ( 5 ) facing away from the side of the first generatrix of the film applicator roll ( 6 ) or adjacent thereto along its peripheral wall to the second generatrix ( 10 ). Contraption ( 1 ) according to any one of claims 8 to 10, wherein the film applicator roll ( 6 ) can be acted upon with increased internal pressure such that along a peripheral region starting from the first generating line ( 9 ) in the direction of rotation of the film applicator roll ( 6 ) up to a third generatrix ( 20 ) by its perforated peripheral wall to the outside a positive pressure effect occurs. Contraption ( 1 ) according to one of claims 8 to 11, which further comprises a second film applicator roll ( 6 ), which the first film applicator roll ( 6 ) is formed accordingly and the same is arranged opposite, so that the plate ( 5 ) simultaneously on both sides with a foil ( 5 ) is coatable. Contraption ( 1 ) according to one of claims 8 to 12, wherein at least one pair of pressure rollers ( 16 ) is provided, which of the at least one film applicator roll ( 6 ) are arranged below and opposite each other and which are provided to the at least one on the plate ( 5 ) applied film ( 7 ) to the plate ( 5 ). Device according to one of claims 8 to 13, wherein the plate coating device ( 2a ) a second coating roller ( 21 ), the first coating roller ( 21 ) is formed accordingly and the same is arranged opposite. Apparatus according to claim 8 or 14, wherein the film applicator device ( 1 ) a heating device ( 17 ), which of the at least one film applicator roll ( 6 ) is arranged below and from which the plate ( 5 ) for curing the liquid coating material ( 30 ) is heated. Device according to one of claims 8 to 15, wherein the plate coating device ( 2a ) before the film applicator ( 1 ) and for applying liquid insulating material to the plate ( 5 ), and wherein after the film applicator device ( 1 ) a second plate coating device ( 2 B ), which is the first plate coating device ( 2a ) and that for applying liquid photoresist on the of the film applicator ( 1 ) on the plate ( 5 ) applied film ( 7 ) is provided. Device according to one of claims 8 to 16, wherein the film to be applied ( 7 ) is a metal foil. Apparatus according to claim 17, wherein the film to be applied ( 7 ) is a copper foil.