阅读说明：本技术 双面电路板及其导通方法 (Double-sided circuit board and conduction method thereof ) 是由 吴祖 于 2019-09-03 设计创作，主要内容包括：本发明公开了一种双面电路板及其导通方法,包括绝缘基材层和分别通过胶粘层设置在绝缘基材层上、下表面的金属线路层,在上、下表面的金属线路层之间需要导通处的绝缘基材层上设有内导通孔,内导通孔中设置半固化胶,上、下表面的金属线路层在内导通孔位通过相对施力形成接触或熔接导通；本发明旨在提供有效导通的上、下线路层,具有增强导电性能、简化加工工序、提高生产效率,减少能源消耗的双面电路板及其导通方法。实现两面集成线路安全,有效地传输信号和导热、散热和让电子元器件的使用寿命更长的技术效果。(The invention discloses a double-sided circuit board and a conduction method thereof, wherein the double-sided circuit board comprises an insulating substrate layer and metal circuit layers which are respectively arranged on the upper surface and the lower surface of the insulating substrate layer through adhesive layers, an inner conduction hole is arranged on the insulating substrate layer at the position needing to be conducted between the metal circuit layers on the upper surface and the lower surface, semi-cured adhesive is arranged in the inner conduction hole, and the metal circuit layers on the upper surface and the lower surface form contact or fusion conduction at the inner conduction hole position through relative force application; the invention aims to provide an upper circuit layer and a lower circuit layer which are effectively conducted, and the double-sided circuit board and the conduction method thereof have the advantages of enhancing the conductivity, simplifying the processing procedure, improving the production efficiency and reducing the energy consumption. The technical effects of safe two-sided integrated circuit, effective signal transmission, heat conduction and heat dissipation and longer service life of electronic components are achieved.)

1. the utility model provides a double-sided circuit board, includes insulating substrate layer (1) and sets up metal wiring layer (2) on insulating substrate layer (1) upper and lower surface through the adhesive layer respectively, its characterized in that: an inner conducting hole (11) is formed in the insulating base material layer (1) at the position needing to be conducted between the metal circuit layers (2) on the upper surface and the lower surface, semi-curing glue (3) is arranged in the inner conducting hole (11), and the metal circuit layers (2) on the upper surface and the lower surface are in contact or fusion connection conduction at the inner conducting hole position through relative force application.

2. The double-sided circuit board of claim 1, wherein: the metal circuit layers (2) on the upper surface and the lower surface are in contact conduction at the inner conduction hole position through opposite force application of the salient point die.

3. The double-sided circuit board of claim 1, wherein: the metal circuit layers (2) on the upper surface and the lower surface are in contact or fusion conduction through ultrasonic welding at the opening position by an ultrasonic welding head matched with the opening.

4. The double-sided circuit board of claim 1, wherein: the semi-curing adhesive (3) is conductive or non-conductive hot-melt semi-curing adhesive.

5. The double-sided circuit board of claim 1, wherein: the metal circuit layers (2) on the upper surface and the lower surface are metal layers made of the same or different materials, and when the metal circuit layers are made of different materials, at least one metal circuit layer (2) is a metal layer capable of meeting the requirement of welding electronic components.

6. The double-sided circuit board of claim 1, wherein: the metal circuit layers (2) on the upper surface and the lower surface are copper foil layers, iron foil layers, aluminum nickel layers, aluminum copper layers or alloys of the above metals.

7. The double-sided circuit board of claim 1, wherein: the insulating substrate layer (1) is PI, PET, PEN, glass fiber cloth, polycarbonate film or pure hot melt adhesive film.

8. the double-sided circuit board of claim 1, wherein: the adhesive layer can be preset on the upper surface and the lower surface of the insulating base material layer (1) or the pasting surface of the metal circuit layer (2).

9. The double-sided circuit board of claim 2, wherein: the bump mould comprises a group of relative pressing rollers, one of the rollers of the group is a flat roller, the other one is a roller with bumps on the surface, or the two rollers are rollers with bumps on the surface, and through the pressing of the group of rollers, the metal circuit layers (2) on the upper surface and the lower surface are inwards communicated and stretched in hole positions to form concave points.

10. The double-sided circuit board of claim 2, wherein: the metal circuit layers (2) on the upper surface and the lower surface form piercing contact between the bottom surfaces which are stretched into the inward conducting hole positions to form concave points.

11. a conduction method of a double-sided circuit board is characterized in that an inner conducting hole (11) is formed in an insulating base material layer (1) at a position where a circuit board needs to be conducted, metal circuit layers (2) are coated on the upper surface and the lower surface of the insulating base material layer (1) through hot melt adhesive films respectively, semi-cured glue (3) is arranged on the coating surfaces of the inner conducting hole (11) or the metal circuit layers (2) opposite to the inner conducting hole (11) in advance, and the metal circuit layers (2) on the upper surface and the lower surface are in contact or fusion connection through relative force application at the inner conducting hole position.

12. the conduction method of the double-sided circuit board according to claim 11, wherein: the adhesive layer can be preset on the upper surface and the lower surface of the insulating base material layer (1) or the pasting surface of the metal circuit layer (2).

13. The conduction method of the double-sided circuit board according to claim 11, wherein: the upper surface and the lower surface of the insulating base material layer (1) are provided with adhesive layers with hot melt adhesives, inner conducting holes (11) are correspondingly formed in the positions, needing to be conducted, of the circuit board, the prefabricated lower metal circuit layer (3) is attached to one surface of the insulating base material layer, semi-curing adhesives (4) are filled in the inner conducting holes (11) of the insulating base material layer (1) or are arranged on the lower metal circuit layer (3) opposite to the openings (11), then the prefabricated upper circuit layer (1) is attached to the other surface of the insulating base material layer (1), contact or fusion welding conduction is formed at the positions, needing to be conducted, of the inner conducting hole positions of the circuit board through relative force application or combination through ultrasonic welding, and then the circuit board is cured through thermosetting to form a double-sided conducting double-sided.

14. The conduction method of the double-sided circuit board according to claim 11, wherein: the mechanism of relative application of force includes a set of relative pressfitting running roller, and one of these running rollers of group is flat running roller, and another is the running roller that the surface took the bump, perhaps two running rollers are the running roller that the surface took the bump, with above-mentioned double-sided circuit board through this running roller pressfitting of group, the bump makes metal wiring layer (2) of upper and lower surface inwards switch on the hole site and stretches and form the concave point.

15. The conduction method of the double-sided circuit board according to claim 11, wherein: the mechanism for applying force oppositely comprises a group of ultrasonic welding heads with convex points, the double-sided circuit board passes through the group of ultrasonic welding heads, and the convex points enable the metal circuit layers (2) on the upper surface and the lower surface to be conducted inwards and vibrated and stretched in hole positions to form concave points.

Technical Field

the invention relates to an LED circuit board, in particular to a double-sided circuit board and a conduction method thereof.

Background

the traditional conduction connection mode of the LED double-sided printed circuit board mainly comprises the following steps: a conducting blind hole communicated with the outside of a single surface is formed on the insulating base material layer and one of the metal circuit layers attached to the surface of the insulating base material layer through a die or a punching CNC machining method, or a conducting through hole communicated with the outside of the single surface is formed by penetrating through the insulating base material layer of the circuit board and the metal circuit layers attached to the upper surface and the lower surface of the circuit board, then an electroplating conducting method, a through silver, through copper and through carbon conducting method and a through tin welding conducting method are adopted in the conducting blind hole and the conducting through hole, and conducting materials are filled in. The conductive materials formed in the conductive blind holes and the conductive through holes by the conduction method are easy to be subjected to insufficient soldering, falling and oxidation, so that the conduction performance and the appearance of the product are influenced. Meanwhile, the product is limited by high price due to the influence of more metal filling processes.

The upper and lower circuit layers of the above-mentioned conduction method can only adopt the metal material of the same material generally, for example when adopting the easy oxidized aluminium metal, it is easy to corrode under the acid and alkali condition, it is unable to carry on the electronic components and parts mounting, soldering tin connection, etc. directly on the aluminium surface, under the existing mature process conditions, it is necessary to mount the electronic components and parts on the aluminium surface or carry on the soldering tin connection, etc., one is to hot press a layer of copper foil on the aluminium surface, another is to plate a layer of copper after the aluminium surface is galvanized and nickel plated, the above two processes, its total cost has already exceeded the cost of the copper foil, and there is also the quality risk, and pollute the environment, so it is not adopted either. The double-sided integrated circuit board is provided with electronic components, and has another important function of conducting two layers of integrated circuits, and based on the reasons that aluminum is very easy to oxidize and is very easy to corrode by acid and alkali, the conducting methods such as an electroplating conducting method, a through silver conducting method, a through copper conducting method, a through carbon conducting method, a through tin welding conducting method and the like which are well known in the prior art can not safely and effectively conduct a double-sided circuit board with a double-sided aluminum structure or a double-sided aluminum-copper structure.

On the basis, Chinese patents appear: CN 201510328709.9-a method for connecting double-sided printed circuit board and welding electronic components by ultrasonic wave, the method discloses that when conducting connection of double-sided printed circuit board is made by ultrasonic wave, ultrasonic machine drives welding fixture to make parallel ultrasonic vibration on metal layer surface of double-sided printed circuit board, when high frequency vibration wave is transmitted to metal surface at two sides of double-sided printed circuit board by welding fixture, high density energy generated is catalyzed resin layer in middle of printed circuit board gradually, finally metal layers at two sides are welded together to form connection after being concave. The method is limited by the direct jacking structure and the method, the metal circuit layers on the two surfaces are relatively deformed until the metal circuit layers are in contact and are limited by the insulating base material layer, the metal circuit layers are not easy to realize contact welding under the vibration of ultrasonic sound waves, and even if the metal circuit layers are in contact welding, the metal circuit layers can fall off under the influence of the outward reaction force of the extruded insulating base material layer, so that the product quality problem is directly caused. Moreover, the insulating property of the insulating substrate layer can hinder the fusion of the two metal circuit layers, which is difficult to realize in the current production technology level.

Disclosure of Invention

The invention aims to solve the technical problem of providing an upper circuit layer and a lower circuit layer which are effectively conducted, and the double-sided circuit board and the conducting method thereof have the advantages of enhancing the conducting performance, simplifying the processing procedure, improving the production efficiency and reducing the energy consumption. The technical effects of safe two-sided integrated circuit, effective signal transmission, heat conduction and heat dissipation and longer service life of electronic components are achieved.

The utility model provides a double-sided circuit board, includes insulating substrate layer and sets up the metal line layer on insulating substrate layer upper and lower surface through the adhesive linkage respectively, wherein: an inner conducting hole is formed in the insulating base material layer at the position needing to be communicated between the metal circuit layers on the upper surface and the lower surface, semi-curing glue is arranged in the inner conducting hole, and the metal circuit layers on the upper surface and the lower surface are in contact or fusion connection at the inner conducting hole position through relative force application. The insulating substrate layer is provided with an inner via hole, semi-curing adhesive is arranged in the inner via hole, metal circuit layers are respectively arranged on the upper surface and the lower surface of the insulating substrate layer, the inner via hole forms an inner hole between the metal circuit layers on the upper surface and the lower surface, the metal circuit layers on the upper surface and the lower surface are stretched and deformed towards the inner via hole, contact or fusion welding conduction is formed between the inner wall surfaces of the inner via hole and the outer wall surfaces of the inner via hole, and concave points are formed by stretching the outer wall surfaces of the inner via hole and the metal circuit layers on the upper. Contact or welded, in the time of through the interior downthehole semi-solid glue realization enlarge with consolidate contact or welded area, make the metal circuit layer connection point of upper and lower surface realize the purpose of solidification connection, simultaneously, the contact or the butt fusion of placing in the board in can not contact with the outside air and oxidize, can not receive physical deformation and damage in the manufacturing procedure such as follow-up electronic components welding because of the circuit plate body. Meanwhile, the conduction sectional area can be increased to realize the technical effect of better conductivity. The conductive welding layer is fused into a whole under the heating condition of 180-280 ℃, so that the technical effect of solid sealing conduction is realized while physical contact conduction is realized.

In the double-sided circuit board, the metal circuit layers on the upper and lower surfaces are in contact conduction at the inner conduction hole position through the opposite force application of the salient point die. Acting force is exerted inwards on the outer surfaces of the metal circuit layers of the upper surface and the lower surface at the inner conduction hole positions through the salient points of the salient point die, so that the metal circuit layers of the upper surface and the lower surface generate relative acting force to stretch to form contact conduction.

In the double-sided circuit board, the metal circuit layers on the upper and lower surfaces are in contact or welded conduction through ultrasonic welding of the ultrasonic welding heads corresponding to the openings at the positions of the openings. Ultrasonic vibration is transmitted to the metal circuit layer through the ultrasonic welding head, so that the metal circuit layers on the upper surface and the lower surface of the force application position are relatively pressed to form contact welding conduction, and are welded with the semi-curing adhesive in the inner conduction hole into a whole.

In the double-sided circuit board, the semi-cured adhesive is conductive or non-conductive hot-melt semi-cured adhesive. The contact points of the upper and lower layers of integrated circuits are fixedly sealed at the via holes through the conductive hot-melt semi-cured adhesive, and the contact area is increased, so that the integrated circuits are isolated from air to form a permanent conductor.

In the double-sided circuit board, the metal circuit layers on the upper surface and the lower surface are metal layers made of the same or different materials, and when the metal circuit layers are made of different materials, at least one of the metal circuit layers is a metal layer capable of meeting the requirement of welding electronic components. The metal circuit layer on the upper surface is made of a metal material which can meet the requirement of welding the electronic component device, and the metal material is made of copper foil, electroplated copper, electroplated nickel, coated copper or coated nickel so as to ensure that the electronic component device is welded and effectively conducted with the lower metal circuit layer. The metal layer that can adopt different kinds of materials, especially one side adopts the copper product in order to satisfy the electronic components dress and paste the carrier that is linked with soldering tin, another side adopts the aluminum product in order to satisfy power supply and signal transmission and heat conduction requirement to make copper product and aluminum product effectively switch on, realize having good heat conduction effect through adopting the aluminum product.

in the double-sided circuit board, the metal circuit layers on the upper and lower surfaces are copper foil layers, iron foil layers, aluminum nickel layers, aluminum copper layers or alloys of the above metals. By adopting the conduction method, the effective conduction can be realized under the condition that the metal circuit layers on the upper surface and the lower surface are made of the same material or different materials.

In the double-sided circuit board, the insulating substrate layer is PI, PET, PEN, glass fiber cloth, polycarbonate film or pure hot melt adhesive film.

in the double-sided circuit board, the adhesive layer can be preset on the upper surface and the lower surface of the insulating base material layer or on the pasting surface of the metal circuit layer.

The bump die comprises a group of opposite pressing rollers C, one of the rollers of the group is a flat roller, the other one of the rollers of the group is a roller with bumps C1 on the surface, or the two rollers are both rollers C with bumps C1 on the surface, and through the pressing of the group of rollers, the metal circuit layers on the upper surface and the lower surface are inwards conducted to form pits 21 in the hole positions.

In the double-sided circuit board, the total thickness of the double-sided circuit board is less than 400 microns; wherein the thickness of the adhesive layer is 6-50 microns, the thickness of the insulating layer is 10-100 microns, the thickness of the upper integrated circuit layer is 6-100 microns, and the thickness of the lower integrated circuit layer is 6-100 microns.

The convex point die comprises a group of relative pressing rollers, one of the rollers is a flat roller, the other roller is a roller with convex points on the surface, or the two rollers are both rollers with convex points on the surface, and the metal circuit layers on the upper surface and the lower surface are pressed by the group of rollers and are stretched in the inward conduction hole positions to form concave points 21. The metal circuit layers on the upper surface and the lower surface are stretched into the inward conducting hole positions to form concave points 21, so that the metal circuit layers on the upper surface and the lower surface are in permanent contact, and the conducting function is ensured to be long, healthy and effective.

In the double-sided circuit board, the bottom surfaces of the concave points formed by stretching the metal circuit layers on the upper surface and the lower surface into the inward conducting hole positions form piercing contact. The metal circuit layers on the upper and lower surfaces form a piercing contact between the concave point contact surfaces, i.e. a hard contact connection is formed between the concave point contact surfaces.

A method for conducting a double-sided circuit board is characterized in that an inner conducting hole is formed in an insulating base material layer at a position where the circuit board needs to be conducted, metal circuit layers are coated on the upper surface and the lower surface of the insulating base material layer through hot melt adhesive films respectively, semi-curing adhesive is arranged in the inner conducting hole or on the coating surface of the metal circuit layer opposite to the inner conducting hole in advance, and the metal circuit layers on the upper surface and the lower surface form contact or fusion connection conduction at the inner conducting hole through opposite force application.

In the above conduction method for the double-sided circuit board, the adhesive layers may be preset on the upper and lower surfaces of the insulating substrate layer or on the bonding surface of the metal circuit layer. The adhesive layer is arranged on the bonding surface of the metal circuit layer in advance, and the adhesive layer and the insulating base material layer are pressed and shaped together.

The conducting method of the double-sided circuit board comprises the steps of arranging adhesive layers with hot melt adhesive on the upper surface and the lower surface of an insulating base material layer, arranging inner conducting holes corresponding to positions, needing to be conducted, of the circuit board, attaching a prefabricated lower metal circuit layer to one surface of the insulating base material layer, filling semi-curing adhesive in the inner conducting holes of the insulating base material layer or arranging the semi-curing adhesive on the lower metal circuit layer opposite to the holes, attaching the prefabricated upper circuit layer to the other surface of the insulating base material layer, conducting contact or fusion conduction is formed at the positions, needing to be conducted, of the inner conducting holes of the circuit board through relative force application or combination through ultrasonic welding, and then conducting the circuit board through double-sided conduction after thermosetting curing. The metal circuit layers on the upper surface and the lower surface are stretched in the inward conducting hole positions to form concave points or are combined to form contact or fusion welding conduction through ultrasonic welding, so that the metal circuit layers on the upper surface and the lower surface are in permanent contact conduction, and the conduction function is ensured to be long, healthy and effective.

In the method for conducting the double-sided circuit board, the mechanism for applying force comprises a group of rollers for pressing oppositely, one of the rollers is a flat roller, the other roller is a roller with salient points on the surface, or the two rollers are both rollers with salient points on the surface, the double-sided circuit board is pressed by the group of rollers, and the salient points enable the metal circuit layers on the upper surface and the lower surface to be stretched into the conducting hole positions to form the concave points. Through the roller pressing with the salient points, the upper metal circuit layer and the lower metal circuit layer form concave pits in the inward via holes at the positions where the circuit boards need to be conducted, semi-cured glue in the inner via holes is compressed, and the semi-cured glue is cured and conducted while the conducting surfaces in the pits are contacted or welded and conducted. The semi-cured glue seals the contact points of the upper and lower layers of integrated circuits in the via hole to isolate the contact points from air to form a permanent conductor.

In the conduction method of the double-sided circuit board, the mechanism for applying force oppositely comprises a group of ultrasonic welding heads with convex points oppositely, and the double-sided circuit board passes through the group of ultrasonic welding heads, so that the convex points enable the metal circuit layers on the upper surface and the lower surface to vibrate and stretch in the inward conduction hole positions to form concave points. Through the ultrasonic welding head with the salient points, the upper metal circuit layer and the lower metal circuit layer are pressed in the inward via hole at the position where the circuit board needs to be conducted to form an inward concave point in a vibrating mode, semi-curing glue located in the inward via hole is compressed, and the semi-curing glue is used for curing and conducting while contact or fusion conduction of the conducting surface in the concave point is achieved. The semi-cured glue seals the contact points of the upper and lower layers of integrated circuits in the via hole to isolate the contact points from air to form a permanent conductor.

compared with the traditional double-sided circuit board, the manufacturing method of the upper circuit layer and the lower circuit layer which are effectively conducted enhances the conductivity, can achieve the effects of water resistance and electricity leakage prevention, and prolongs the service life of the circuit board. Meanwhile, the process is simplified, so that the production efficiency can be improved, the energy consumption is reduced, the time and the cost are saved, and the damage to the environment is reduced. The LED lamp strip is particularly suitable for flexible circuits.

Drawings

The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.

FIG. 1 is a schematic cross-sectional view of the packaged state of the present invention;

FIG. 2 is a cross-sectional view of the invention after the packaging process is completed;

FIG. 3 is a schematic view of a welding configuration of a sonotrode of a first embodiment of the present invention;

Fig. 4 is a schematic view of a pressing structure of a pressing roller according to a third embodiment of the present invention.

Detailed Description

As shown in fig. 1 to 4, the double-sided circuit board of the present invention includes an insulating substrate layer 1 and metal circuit layers 2 respectively disposed on the upper and lower surfaces of the insulating substrate layer 1 through adhesive layers 5, an inner via hole 11 is disposed on the insulating substrate layer 1 at a position where the metal circuit layers 2 on the upper and lower surfaces need to be conducted, a semi-curable adhesive 3 is disposed in the inner via hole 11, and the metal circuit layers 2 on the upper and lower surfaces form contact or fusion conduction at the inner via hole position through relative force application.

The metal circuit layers 2 on the upper surface and the lower surface are in contact conduction at the inner conduction hole position through opposite force application of the salient point die.

The metal circuit layers 2 on the upper surface and the lower surface are in contact or fusion conduction through ultrasonic welding at the hole opening position through an ultrasonic welding head matched with the hole opening.

The semi-curing adhesive 3 is conductive or non-conductive hot-melting semi-curing adhesive.

the metal circuit layers 2 on the upper surface and the lower surface are metal layers made of the same or different materials, and when the metal circuit layers are made of different materials, at least one metal circuit layer 2 is a metal layer which can meet the requirement of welding electronic components.

The metal circuit layers 2 on the upper and lower surfaces are copper foil layers, iron foil layers, aluminum-plated nickel layers, aluminum-plated copper layers or alloys of the above metals.

The insulating substrate layer 1 is PI, PET, PEN, glass fiber cloth, polycarbonate film or pure hot melt adhesive film.

The adhesive layer 5 may be pre-disposed on the upper and lower surfaces of the insulating substrate layer 1 or on the bonding surface of the metal wiring layer 2.

the total thickness of the double-sided circuit board is less than 400 microns; wherein the thickness of the adhesive layer is 6-50 microns, the thickness of the insulating layer is 10-100 microns, the thickness of the upper integrated circuit layer is 6-100 microns, and the thickness of the lower integrated circuit layer is 6-100 microns.

The salient point die comprises a group of opposite pressing rollers, one of the rollers of the group is a flat roller, the other one is a roller C with salient points C1 on the surface, or the two rollers are rollers with salient points on the surface, and through the pressing of the group of rollers, the metal circuit layers 2 on the upper surface and the lower surface are stretched in the inward conduction hole positions to form the concave points 21.

The metal circuit layers 2 on the upper and lower surfaces form piercing contact between the bottom surfaces of the inward conducting holes stretched to form the pits 21.

A method for conducting a double-sided circuit board is characterized in that an inner conducting hole 11 is formed in an insulating base material layer 1 at a position where the circuit board needs to be conducted, metal circuit layers 2 are coated on the upper surface and the lower surface of the insulating base material layer 1 through hot melt adhesive films respectively, semi-curing adhesive 3 is arranged in the inner conducting hole 11 or on the coating surface of the metal circuit layer 2 opposite to the inner conducting hole 11 in advance, and the metal circuit layers 2 on the upper surface and the lower surface are in contact or fusion conduction at the inner conducting hole position through opposite force application.

The adhesive layer may be pre-arranged on the upper and lower surfaces of the insulating substrate layer 1 or on the pasting surface of the metal circuit layer 2.

the upper surface and the lower surface of the insulating substrate layer 1 are provided with adhesive layers with hot melt adhesives, inner conducting holes 11 are correspondingly formed in the positions, needing to be conducted, of the circuit board, the prefabricated lower metal circuit layer 3 is attached to one surface of the lower metal circuit layer, semi-curing adhesives 4 are filled in the inner conducting holes 11 of the insulating substrate layer 1 or are arranged on the lower metal circuit layer 3 opposite to the openings 11, the prefabricated upper circuit layer 1 is attached to the other surface of the insulating substrate layer 1, the inner conducting hole positions, needing to be conducted, of the circuit board are in contact or fusion conduction through relative force application or combination and ultrasonic welding, and then the circuit board is cured through thermosetting to form a double-sided conducting double-sided circuit board.

The mechanism of relative application of force includes a set of relative pressfitting running roller, and one of these running rollers of group is flat running roller, and another is the running roller of surface area bump, perhaps two running rollers are the running roller of surface area bump, with above-mentioned double-sided circuit board through this running roller pressfitting of group, the bump makes metal wiring layer 2 of upper and lower surface inwards switch on the hole site and stretches and form the concave point.

The mechanism for applying force oppositely comprises a group of ultrasonic welding heads with convex points, the double-sided circuit board passes through the group of ultrasonic welding heads, and the convex points enable the metal circuit layers 2 on the upper surface and the lower surface to vibrate and stretch in the inward conduction hole positions to form concave points.

The first specific embodiment of the invention in specific production is as follows:

1. Coating a glue mucosa on a PI film or a PET film, coating an aluminum foil layer (a lower metal circuit layer) and manufacturing a single-sided board substrate for later use after thermosetting curing;

2. manufacturing a metal circuit layer of the lower layer of the double-sided circuit board on the single-sided board substrate manufactured in the step 1 according to design data;

3. Selecting a protective film resistant to acid-base etching, covering a layer of copper foil, and manufacturing an upper metal circuit layer on the copper foil for later use;

4. Selecting a hot-melt adhesive pure glue film or an insulating film with hot-melt semi-curing glue on both sides, and manufacturing positioning holes and inner conducting holes 11 as required for later use;

5. pre-bonding the manufactured metal circuit layer of the lower layer and one surface of the hot-melt adhesive pure glue film or the insulating film with the opened inner conducting hole together (bonding the exposed gold layer surface and the glue surface), then applying conductive or non-conductive semi-curing glue at the inner conducting hole in a screen printing mode, and baking the semi-curing glue at 80 ℃ for 30 minutes for later use;

6. And (3) attaching the metal exposed surface of the upper metal circuit layer manufactured in the step (3) to the other surface of the pure glue film or the insulating film printed with the semi-curing glue in the step (2), pressing and shaping the two together through a rapid press, and removing the acid and alkali resistant protective film in the step (3).

7. Opening a set of ultrasonic welding mold B for later use;

8. carrying out welding work on the position, needing to be communicated, of the circuit board A by using the ultrasonic welding die B, heating the welding position because the ultrasonic welding machine can generate high-temperature heat during welding, and dissolving the hot melt adhesive film in the step 4 by using the temperature and the pressure of ultrasonic welding to ensure that the upper metal circuit layer is welded and communicated with the lower metal circuit layer;

9. And then performing thermosetting curing on the double-sided circuit board with the upper and lower metal circuit layers conducted for 150 ℃ for 60 minutes, and curing the hot-melt adhesive pure glue film to manufacture the circuit board A with the upper and lower metal circuit layers conducted.