Roll flexible substrate with reinforcing rib edges

Abstract

The utility model discloses a coiled flexible substrate with reinforcing rib edges, which comprises a plurality of flexible circuit board bodies, connecting strips are arranged at the joints of the adjacent flexible circuit board bodies, and each flexible circuit board body comprises a middle aluminum foil layer, a first insulating film layer, a second insulating film layer, a first copper foil layer, a second copper foil layer and a protective spraying layer. The protective spraying layer is sprayed on the surfaces of the first copper foil layer and the second copper foil layer; vertical rib edges are integrally formed on the symmetrical edges of the middle aluminum foil layer, and the edges of the middle aluminum foil layer are located in the middles of the vertical rib edges. And two ends of the vertical rib edge respectively extend into and are adhered to the inner parts of the edges of the first insulating film layer and the second insulating film layer. The flexible circuit board is reasonable in structural arrangement, the adjacent flexible circuit board bodies are connected through the connecting strips, coiling and folding are facilitated, the use convenience is improved, the vertical rib edges are arranged on the symmetrical edges of the middle aluminum foil layer, the overall tearing strength is improved, the overall use strength is improved, and the flexible circuit board is high in applicability and good in practicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of flexible circuit boards, and in particular relates to a rolled flexible substrate with a reinforced rib edge. Background Art

[0002] With the continuous development of PCB process technology, PCB circuit boards are widely used in various industries, from some large-scale control equipment to the current LED control and other fields. The application of hard boards has been very mature. Hard boards are also called rigid PCB boards, which use rigid PCB substrates. However, with the development and progress of society, PCB soft boards or soft-hard combination boards are now popular. Most of these boards use flexible substrates, such as flexible substrates made of PI polyimide substrate materials. Because of their good mechanical properties and excellent chemical resistance, they have become the preferred material for existing flexible substrates and have received widespread attention.

[0003] However, the current flexible substrates all have a disadvantage. Since the material layers are bonded and fixed with adhesives such as epoxy resin adhesives, their tear resistance is relatively poor and burrs are easily generated on the sides, which can easily cause inconvenience to users in actual use. At the same time, the flexible circuit boards in the prior art are mostly sheet structures, which are not conducive to rolling and folding, transportation and operation, and therefore are not very practical. Summary of the invention

[0004] The utility model aims to provide a rolled flexible substrate with a reinforced rib edge which has a reasonable structure and is conducive to improving the tearing strength.

[0005] The technical solution to achieve the purpose of the utility model is a rolled flexible substrate with a reinforced rib edge, including a plurality of flexible circuit board bodies, and a connecting strip is provided at the connection of adjacent flexible circuit board bodies, and the flexible circuit board body includes a middle aluminum foil layer, a first insulating film layer, a second insulating film layer, a first copper foil layer, a second copper foil layer and a protective spray layer;

[0006] The first insulating film layer and the second insulating film layer are arranged on both sides of the middle aluminum foil layer;

[0007] The first copper foil layer is bonded to a side of the first insulating film layer away from the aluminum foil layer;

[0008] The second copper foil layer is bonded to a side of the second insulating film layer away from the aluminum foil layer;

[0009] The protective spray coating is sprayed on the surface of the first copper foil layer and the second copper foil layer;

[0010] The symmetrical edges of the middle aluminum foil layer are integrally formed with vertical rib edges, and the edges of the middle aluminum foil layer are located in the middle of the vertical rib edges;

[0011] The two ends of the vertical rib edge extend into and are bonded to the inside of the edges of the first insulating film layer and the second insulating film layer respectively.

[0012] It is further preferred that: the top edge and the bottom edge of the vertical rib edge are both provided with a V-shaped buffer groove;

[0013] The V-shaped buffer groove on the top edge and the V-shaped buffer groove on the bottom edge are arranged in a staggered manner.

[0014] It is further preferred that: the ends of the middle aluminum foil layer, the first insulating film layer and the second insulating film layer are provided with avoidance grooves;

[0015] The end of the connecting strip is inserted into the avoidance groove and fixed by bonding.

[0016] Further preferably, the connecting strip comprises a central copper layer and insulating film layers symmetrically arranged on both sides of the central copper layer.

[0017] It is further preferred that: the thickness of the connecting strip matches the thickness of the avoidance groove.

[0018] It is further preferred that: the first insulating film layer and the second insulating film layer have the same thickness;

[0019] The total height of the vertical ribs is less than the total thickness of the first insulating film layer and the second insulating film layer.

[0020] The utility model has positive effects: the structure of the utility model is reasonably arranged, and adjacent flexible circuit board bodies are connected by connecting strips, so that multiple flexible circuit board bodies can be connected into a whole, which is convenient for rolling and folding, and convenient for subsequent transportation and use, and improves the convenience of use. At the same time, vertical rib edges are arranged on the symmetrical edges of the middle aluminum foil layer, and the vertical rib edges extend into the edges of the first insulating film layer and the second insulating film layer respectively, so that the overall tearing strength can be improved, which is conducive to improving the overall use strength, and has strong applicability and good practicality;

[0021] Moreover, the top and bottom surfaces of the vertical rib edges are provided with staggered V-shaped buffer grooves, which facilitate the winding operation without affecting the tearing strength and are highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the utility model easier to understand, the utility model is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 for Figure 1 The AA section shows the schematic structure diagram;

[0025] Figure 3 for Figure 1 Middle BB shows the schematic diagram of the structure;

[0026] Figure 4 It is a schematic diagram of the overall structure of the middle aluminum foil layer and the vertical rib edges in the utility model.

[0027] Figure numerals: flexible circuit board body 1, middle aluminum foil layer 11, first insulating film layer 12, second insulating film layer 13, first copper foil layer 14, second copper foil layer 15, protective spray coating 16, connecting strip 2, middle copper layer 21, insulating film layer 22, vertical rib edge 3, V-shaped buffer groove 4, avoidance groove 5. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example

[0030] See Figures 1 to 4 As shown, a roll-up flexible substrate with a reinforced rib edge includes a plurality of flexible circuit board bodies 1, and a connecting strip 2 is provided at the connection of adjacent flexible circuit board bodies. In this embodiment, the connecting strip is mainly used to connect adjacent flexible circuit board bodies so that they can be rolled up and folded. In this embodiment, the connecting strip 2 includes a middle copper layer 21 and an insulating film layer 22 symmetrically arranged on both sides of the middle copper layer. In this embodiment, the insulating film layer is a conventional structure of the prior art, which is mainly used for insulation isolation.

[0031] In actual application, the flexible circuit board body 1 includes a middle aluminum foil layer 11, a first insulating film layer 12, a second insulating film layer 13, a first copper foil layer 14, a second copper foil layer 15 and a protective spray coating 16; in this embodiment, the thickness of the first insulating film layer and the second insulating film layer is the same; and the above structures are conventional structures of the prior art, which are simply applied, so they are not recorded in detail. During processing, the first insulating film layer and the second insulating film layer are arranged on both sides of the middle aluminum foil layer; the first copper foil layer is bonded to the side of the first insulating film layer away from the aluminum foil layer; the second copper foil layer is bonded to the side of the second insulating film layer away from the aluminum foil layer; the protective spray coating is sprayed on the surface of the first copper foil layer and the second copper foil layer; its connection method is the conventional connection method of the flexible circuit board body in the prior art, which can be bonding or hot pressing. This is a conventional processing method in the prior art, so it is not recorded in detail.

[0032] In this embodiment, in order to improve the overall tear resistance, the symmetrical edges of the middle aluminum foil layer are integrally formed with vertical ribs 3, and the total height of the vertical ribs is less than the total thickness of the first insulating film layer and the second insulating film layer. The edge of the middle aluminum foil layer is in the middle of the vertical ribs; the two ends of the vertical ribs extend into and adhere to the inside of the edges of the first insulating film layer and the second insulating film layer respectively. Through the above structure, the tear resistance of the side can be improved, and it is also beneficial to increase the heat dissipation area, which is highly practical.

[0033] In this embodiment, in order to ensure the effectiveness of rolling, the top and bottom edges of the vertical ribs are both provided with V-shaped buffer grooves 4, and the V-shaped buffer grooves of the top and bottom are staggered. When rolling and folding, the stability and reliability of rolling and folding can be ensured due to the presence of the V-shaped buffer grooves, and the staggered arrangement of the top and bottom surfaces can ensure tearing strength and strong practicality.

[0034] The ends of the middle aluminum foil layer, the first insulating film layer and the second insulating film layer are provided with avoidance grooves 5; the ends of the connecting strips are inserted into the avoidance grooves and fixed by bonding. The thickness of the connecting strips matches the thickness of the avoidance grooves. In this embodiment, through the above structure, it can be ensured that a plurality of flexible circuit board bodies are integrated, thereby facilitating the rolling and folding operation, and the connecting strips can be processed and formed during the processing process, which will not affect the subsequent normal use.

[0035] The utility model has positive effects: the structure of the utility model is reasonably arranged, and adjacent flexible circuit board bodies are connected by connecting strips, so that multiple flexible circuit board bodies can be connected into a whole, which is convenient for rolling and folding, and convenient for subsequent transportation and use, and improves the convenience of use. At the same time, vertical rib edges are arranged on the symmetrical edges of the middle aluminum foil layer, and the vertical rib edges extend into the edges of the first insulating film layer and the second insulating film layer respectively, so that the overall tearing strength can be improved, which is conducive to improving the overall use strength, and has strong applicability and good practicality;

[0036] Moreover, the top and bottom surfaces of the vertical rib edges are provided with staggered V-shaped buffer grooves, which facilitate the winding operation without affecting the tearing strength and are highly practical.

[0037] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification can also be directly processed according to existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0038] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still belong to the protection scope of the present invention.

Claims

1. A rolled flexible substrate with a reinforced rib edge, comprising a plurality of flexible circuit board bodies, wherein connecting strips are provided at the connection points of adjacent flexible circuit board bodies, characterized in that: The flexible circuit board body comprises a middle aluminum foil layer, a first insulating film layer, a second insulating film layer, a first copper foil layer, a second copper foil layer and a protective spray coating; The first insulating film layer and the second insulating film layer are arranged on both sides of the middle aluminum foil layer; The first copper foil layer is bonded to a side of the first insulating film layer away from the aluminum foil layer; The second copper foil layer is bonded to a side of the second insulating film layer away from the aluminum foil layer; The protective spray coating is sprayed on the surface of the first copper foil layer and the second copper foil layer; The symmetrical edges of the middle aluminum foil layer are integrally formed with vertical rib edges, and the edges of the middle aluminum foil layer are located in the middle of the vertical rib edges; The two ends of the vertical rib edge extend into and are bonded to the inside of the edges of the first insulating film layer and the second insulating film layer respectively.

2. The rolled flexible substrate with reinforced rib edges according to claim 1, characterized in that: The top and bottom edges of the vertical ribs are both provided with V-shaped buffer grooves; The V-shaped buffer groove on the top edge and the V-shaped buffer groove on the bottom edge are arranged in a staggered manner.

3. The rolled flexible substrate with reinforced rib edges according to claim 2, characterized in that: The ends of the middle aluminum foil layer, the first insulating film layer and the second insulating film layer are provided with avoidance grooves; The end of the connecting strip is inserted into the avoidance groove and fixed by bonding.

4. The rolled flexible substrate with reinforced rib edges according to claim 3, characterized in that: The connecting strip comprises a central copper layer and insulating film layers symmetrically arranged on both sides of the central copper layer.

5. The rolled flexible substrate with reinforced rib edges according to claim 4, characterized in that: The thickness of the connecting strip matches the thickness of the avoidance groove.

6. The rolled flexible substrate with reinforced rib edges according to claim 1, characterized in that: The first insulating film layer and the second insulating film layer have the same thickness; The total height of the vertical ribs is less than the total thickness of the first insulating film layer and the second insulating film layer.

Images