Flexible circuit board web

Abstract

The present application relates to the technical field of flexible circuit board production, and discloses a flexible circuit board roll, which can be wound into a roll shape. In the flexible circuit board roll, the PI layer is in the shape of a long strip, and the PI layer has a front surface and a back surface. The front surface copper layer is in the shape of a long strip, and a plurality of front surface copper layers are arranged on the front surface of the PI layer along the length direction of the PI layer. The back surface copper layer is in the shape of a long strip, and a plurality of back surface copper layers are arranged on the back surface of the PI layer along the length direction of the PI layer. The back surface copper layer and the front surface copper layer are arranged opposite to each other. The front surface connecting assembly is arranged on the front surface of the PI layer, and the front surface connecting assembly is arranged at the joint between any two adjacent front surface copper layers. The front surface connecting assembly is sequentially connected to the front surface copper layer. The above arrangement enables the PI layer and the front surface connecting assembly to jointly bear the tension in the roll-to-roll process and the automatic feeding and winding process, so that the PI layer is prevented from being easily pulled off, and the yield is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible circuit board production, and particularly relates to a flexible circuit board roll. BACKGROUND

[0002] The production process of a double-sided panel in a flexible circuit board (FPC) is generally: cutting-drilling-black hole-copper plating-exposure-etching-fake pasting-baking, etc. Professional personnel are needed to operate after each process, and a large amount of manpower is needed. In order to improve the production efficiency of FPC and reduce the production cost, most companies use whole roll production and processing method to replace single sheet operation. The whole roll of flexible circuit board raw materials is cut into corresponding size single bodies by a cutting machine, and then the corresponding production process is carried out. On the one hand, it can save the labor cost; on the other hand, due to the reduction of human factors, the size and performance of the product are relatively stable, thereby improving the yield and improving the product power of the company. The existing roll material does not reserve copper design at the joint between the front and rear two panels. Since the copper at the joint between the front and rear panels of the PI base material is etched off, the polyimide (PI) base material is completely exposed. Since the PI base material has low strength, the exposed PI base material is easily broken during the roll-to-roll process and the automatic feeding and unwinding process, resulting in batch product scrap.

[0003] Therefore, it is urgent to research a flexible circuit board roll to solve the problem that the PI base material is easily broken during the roll-to-roll process, resulting in batch product scrap and low yield. SUMMARY

[0004] The purpose of the present application is to provide a flexible circuit board roll to solve the problem that the PI base material is easily broken during the roll-to-roll process, resulting in batch product scrap and low yield.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] The present application provides a flexible circuit board roll which can be wound into a roll shape, and the flexible circuit board roll comprises:

[0007] A PI layer in a strip shape, the PI layer having a front surface and a back surface;

[0008] A front copper layer in a strip shape, the front copper layer being provided with a plurality of front copper layers, and the plurality of front copper layers being provided on the front surface of the PI layer along the length direction of the PI layer;

[0009] The reverse copper layer is in the shape of a long strip, and a plurality of the reverse copper layers are arranged on the reverse of the PI layer in the length direction of the PI layer.

[0010] The front connecting assembly is arranged on the front of the PI layer, and the front connecting assembly is arranged at the joint between any two adjacent front copper layers.

[0011] As a preferred technical solution of the flexible circuit board roll, the front connecting assembly comprises a front first connecting member and a front second connecting member, the front first connecting member and the front second connecting member are arranged at two ends of the PI layer in the width direction, the front first connecting member and the front copper layer are sequentially connected at the two ends, the front second connecting member and the front copper layer are sequentially connected at the two ends, and the width direction is perpendicular to the length direction.

[0012] As a preferred technical solution of the flexible circuit board roll, the front connecting assembly comprises a front third connecting member, the front third connecting member is arranged between the front first connecting member and the front second connecting member, and the front third connecting member and the front copper layer are sequentially connected at the two ends.

[0013] As a preferred technical solution of the flexible circuit board roll, the front third connecting member is provided with a plurality of front third connecting members, and the plurality of front third connecting members are arranged between the front first connecting member and the front second connecting member in the width direction of the PI layer.

[0014] As a preferred technical solution of the flexible circuit board roll, the flexible circuit board roll comprises a reverse connecting assembly, the reverse connecting assembly is arranged on the reverse of the PI layer, the reverse connecting assembly is arranged at the joint between any two adjacent reverse copper layers, and the reverse connecting assembly and the reverse copper layer are sequentially connected at the two ends.

[0015] As a preferred technical solution of the flexible circuit board roll, the reverse connecting assembly comprises a reverse first connecting member and a reverse second connecting member, the reverse first connecting member and the reverse second connecting member are arranged at two ends of the PI layer in the width direction, the reverse first connecting member and the reverse copper layer are sequentially connected at the two ends, and the reverse second connecting member and the reverse copper layer are sequentially connected at the two ends.

[0016] As a preferred technical solution of the flexible circuit board roll, the reverse connecting assembly comprises a reverse third connecting member, the reverse third connecting member is arranged between the reverse first connecting member and the reverse second connecting member, and the reverse third connecting member and the reverse copper layer are sequentially connected at the two ends.

[0017] As a preferred technical solution for flexible circuit board roll material, a plurality of reverse third connectors are provided, and the plurality of reverse third connectors are all disposed between the reverse first connector and the reverse second connector, and are spaced apart along the width direction of the PI layer.

[0018] As a preferred technical solution for flexible circuit board roll material, the front connecting assembly includes a front first connector, a front second connector, and a front third connector. A plurality of front third connectors are provided, each disposed between the front first connector and the front second connector, and spaced apart along the width direction of the PI layer. The projections of the front third connectors along the thickness direction of the PI layer and the projections of the back third connectors along the thickness direction of the PI layer are staggered along the width direction of the PI layer, where the thickness direction is perpendicular to both the length direction and the width direction.

[0019] As a preferred technical solution for flexible circuit board rolls, the front connecting component is made of copper and is integrally formed with the front copper layer.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention provides a flexible circuit board roll material. In this flexible circuit board roll material, the PI layer is in the shape of a long strip and has a front side and a back side. The front copper layer is in the shape of a long strip and there are several front copper layers, which are spaced apart along the length of the PI layer on the front side. The back copper layer is in the shape of a long strip and there are several back copper layers, which are spaced apart along the length of the PI layer on the back side. The back copper layers and the front copper layers are arranged opposite each other. The front connecting component is attached to the front side of the PI layer, and a front connecting component is provided at the joint between any two adjacent front copper layers. The front connecting component is connected to the front copper layer end to end in sequence. In this design, several front copper layers and several back copper layers are arranged opposite each other and spaced apart, so that each front copper layer, back copper layer and the PI layer between them form a unit. The units are connected by the PI layer and the front connecting component, which increases the connection strength between the units. In the roll-to-roll process, during the automatic take-up and unload process, the PI layer and the front connecting component share the tensile force, which prevents the PI layer from being easily broken and improves the yield. Attached Figure Description

[0022] Figure 1 This is a top view of the flexible circuit board roll structure in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Cross-sectional view along the AA direction.

[0024] Fig.:

[0025] X, width direction; Y, length direction; Z, thickness direction;

[0026] 100, single body;

[0027] 1, PI layer;

[0028] 2, front copper layer;

[0029] 3, back copper layer;

[0030] 4, front connecting assembly; 41, front first connecting piece; 42, front second connecting piece; 43, front third connecting piece;

[0031] 5, back connecting assembly; 51, back first connecting piece; 52, back second connecting piece; 53, back third connecting piece. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature on the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0036] The production process of double-sided panel in flexible circuit board (FPC) is generally: cutting-drilling-black hole-copper plating-exposure-etching-false pasting-baking, etc. Each process needs professional operation, and requires a large amount of manpower. In order to improve the production efficiency of FPC and reduce the production cost, most companies choose whole roll production processing method instead of single sheet operation in the early stage of FPC production.

[0037] The flexible circuit board roll material (i.e. whole roll of flexible circuit board) is cut into single body 100 of corresponding size by using cutting machine, and then the production of the following corresponding process is carried out. By means of the above process, on the one hand, the labor cost can be saved; on the other hand, due to the reduction of human factors, the size and performance of the product are relatively stable, thereby improving the yield, and further helping to improve the product power of the company.

[0038] However, the existing flexible circuit board roll material does not reserve copper design at the joint between the front and rear single bodies 100, that is, the copper at the joint of the front and rear single bodies 100 on the PI layer is etched off, so that the polyimide (PI) substrate is completely exposed. Since the PI layer has low strength, the exposed PI layer at the joint is easy to be pulled off during roll-to-roll and automatic feeding and winding process, resulting in batch product scrap.

[0039] As shown in Figure 1 and Figure 2 , Figure 1Fig. 1 is a schematic view of the top structure of the unwound flexible circuit board roll in the embodiment of the present application, wherein the dashed line portion represents the reverse third connecting member 53 blocked by the PI layer 1, and the flexible circuit board roll has a plurality of units 100, and a joint is arranged between every two adjacent units 100, and the joint needs to be cut during manufacturing to complete the production of the unit 100, for the convenience of description, only two adjacent units 100 are drawn as a schematic in the figure; Figure 2 Fig. 2 is a sectional view of the embodiment of the present application along the direction A-A. Figure 1 Fig. 3 is a sectional view of the embodiment of the present application along the direction B-B.

[0040] The embodiment provides a flexible circuit board roll, which can be wound into a roll shape, and the roll-shaped flexible circuit board roll is used in a roll-to-roll process, briefly, the roll-shaped flexible circuit board roll is fixed on a rotating mechanism, and a free end of the flexible circuit board roll is dragged, the unwound flexible circuit board roll is cut into units 100 in the dragging process, and then the units 100 are subjected to process treatments such as drilling, black hole, copper plating, exposure, etching, false pasting and baking. The flexible circuit board roll comprises a PI layer 1, a front copper layer 2, a reverse copper layer 3 and a front connecting assembly 4, wherein the PI layer 1 is in a long strip shape, and the PI layer 1 has a front surface and a reverse surface; the front copper layer 2 is in a long strip shape, and a plurality of front copper layers 2 are arranged on the front surface of the PI layer 1 along a length direction Y of the PI layer 1; the reverse copper layer 3 is in a long strip shape, and a plurality of reverse copper layers 3 are arranged on the reverse surface of the PI layer 1 along the length direction Y of the PI layer 1; the reverse copper layer 3 is arranged opposite to the front copper layer 2; and the front connecting assembly 4 is arranged on the front surface of the PI layer 1, and the front connecting assembly 4 is arranged at a joint between any two adjacent front copper layers 2, and the front connecting assembly 4 and the front copper layer 2 are sequentially connected.

[0041] In the flexible circuit board roll, the front copper layer 2 and the reverse copper layer 3 are arranged on the front surface and the reverse surface of the PI layer 1 respectively, the plurality of front copper layers 2 and the plurality of reverse copper layers 3 are arranged opposite to and spaced from each other, each front copper layer 2, each reverse copper layer 3 and the PI layer 1 therebetween form a unit 100, the front connecting assembly 4 is arranged between the two adjacent front copper layers 2, and the front connecting assembly 4 and the front copper layer 2 are sequentially connected, through the structure of the front connecting assembly 4, the units 100 are connected through the PI layer 1 and the front connecting assembly 4, the connection strength between the units 100 is increased, and in the roll-to-roll process, the PI layer 1 and the front connecting assembly 4 jointly bear the tension, the PI layer 1 is prevented from being easily torn, and the yield is improved.

[0042] In the embodiment, regarding the structure of the front connecting assembly 4, the front connecting assembly 4 can alternatively include a front first connecting piece 41 and a front second connecting piece 42, the front first connecting piece 41 and the front second connecting piece 42 are located at two ends of the PI layer 1 along the width direction X, the front first connecting piece 41 and the front copper layer 2 are sequentially connected end to end, the front second connecting piece 42 and the front copper layer 2 are sequentially connected end to end, and the width direction X is perpendicular to the length direction Y. When the flexible circuit board roll is cut, the PI layer 1, the front first connecting piece 41 and the front second connecting piece 42 need to be cut off. The width dimension of the front first connecting piece 41 and the width dimension of the front second connecting piece 42 are the same, which is 0.5mm-5mm; the length dimension of the front first connecting piece 41 and the length dimension of the front second connecting piece 42 are the same, which is 1mm-10mm. Preferably, the width dimension of the front first connecting piece 41 and the width dimension of the front second connecting piece 42 can be 1mm-2mm, and specifically 1.5mm. The length dimension of the front first connecting piece 41 and the length dimension of the front second connecting piece 42 are both 1mm-3mm, and specifically 2mm. Of course, the width dimension and the length dimension of the front first connecting piece 41 can be adjusted according to the width dimension and the thickness dimension of the actual PI layer 1 and the roll-to-roll process. The width dimension and the length dimension of the front second connecting piece 42 can also be adjusted according to the width dimension and the thickness dimension of the actual PI layer 1 and the roll-to-roll process.

[0043] In the roll-to-roll process, if the speed is faster, the strength requirement of the PI layer 1 is higher, and if the strength at the joint seam is different at each place in the width direction X of the PI layer 1, that is, the thickness at the joint seam is not uniform in the width direction X, in this case, in the dragging process, the joint seam can appear a wrinkled condition, that is, the front first connecting piece 41 and the front second connecting piece 42 are close to each other, thereby affecting the bonding relationship between the PI layer 1 and the front copper layer 2 and the back copper layer 3, causing the PI layer 1 to be misaligned with the front copper layer 2 and the back copper layer 3, and further causing the single body 100 cut out later to be unable to be used. Therefore, in the embodiment, the front connecting assembly 4 includes a front third connecting piece 43, the front third connecting piece 43 is located between the front first connecting piece 41 and the front second connecting piece 42, and the front third connecting piece 43 and the front copper layer 2 are sequentially connected end to end. The arrangement of the front third connecting piece 43 makes the connection strength at the joint seam more uniform in the width direction X of the PI layer 1, avoiding the occurrence of wrinkles at the joint seam in the roll-to-roll process; in addition, due to the addition of the front third connecting piece 43, the connection strength between the single bodies 100 is also increased, which can adapt to a faster processing process.

[0044] The width dimension of the front third connecting piece 43 is 0.5mm-5mm; the length dimension of the front third connecting piece 43 is 1mm-10mm. Preferably, the width dimension of the front third connecting piece 43 can be 1mm-2mm, specifically 1.5mm. The length dimension of the front third connecting piece 43 is 1mm-3mm, specifically 2mm. Of course, the width dimension and length dimension of the front third connecting piece 43 can also be adjusted according to the width dimension, thickness dimension of the PI layer 1 and the roll-to-roll process.

[0045] Further, the front third connecting piece 43 is provided with a plurality of front third connecting pieces 43, which are arranged between the front first connecting piece 41 and the front second connecting piece 42 and are arranged along the width direction X of the PI layer 1. Preferably, the number of the front third connecting piece 43 can be reasonably selected according to the width dimension of the PI layer 1, and the distance between any two adjacent front third connecting pieces 43 is as same as possible to ensure the balance of force. Of course, if it involves tool holes or other marking points, the position of the front third connecting piece 43 can be adjusted appropriately to avoid interference.

[0046] In the first embodiment of the present embodiment, the front first connecting piece 41 is in the form of a long strip. In the second embodiment of the present embodiment, the front second connecting piece 42 is in the form of a long strip. In the third embodiment of the present embodiment, the front third connecting piece 43 is in the form of a long strip. The above three embodiments can be arbitrarily combined, and seven kinds of embodiments can be combined, preferably, the front first connecting piece 41, the front second connecting piece 42 and the front third connecting piece 43 are all in the form of a long strip. In other words, at least the front first connecting piece 41 and the front second connecting piece 42 are in the form of a long strip.

[0047] To further improve the connection strength of the joint seam, in the present embodiment, the flexible circuit board roll material comprises a back connecting assembly 5, which is attached to the back of the PI layer 1, and the back connecting assembly 5 is arranged between any two adjacent back copper layers 3, and the back connecting assembly 5 is sequentially connected with the back copper layer 3.

[0048] The reverse side connecting assembly 5 comprises a first reverse side connecting piece 51 and a second reverse side connecting piece 52, which are separately arranged at the two ends of the PI layer 1 along the width direction X, and the first reverse side connecting piece 51 and the second reverse side connecting piece 52 are sequentially connected with the reverse side copper layer 3 at the head and tail. The above arrangement improves the connection strength at the joint. The width dimension of the first reverse side connecting piece 51 and the width dimension of the second reverse side connecting piece 52 are the same, which is 0.5mm-5mm; the length dimension of the first reverse side connecting piece 51 and the length dimension of the second reverse side connecting piece 52 are the same, which is 1mm-10mm. Preferably, the width dimension of the first reverse side connecting piece 51 and the width dimension of the second reverse side connecting piece 52 can be 1mm-2mm, and specifically 1.5mm; the length dimension of the first reverse side connecting piece 51 and the length dimension of the second reverse side connecting piece 52 are both 1mm-3mm, and specifically 2mm. Of course, the width dimension and the length dimension of the first reverse side connecting piece 51 can be adjusted according to the width dimension and the thickness dimension of the PI layer 1 and the roll-to-roll process. The width dimension and the length dimension of the second reverse side connecting piece 52 can also be adjusted according to the width dimension and the thickness dimension of the PI layer 1 and the roll-to-roll process.

[0049] In combination with the structure of the front side connecting assembly 4, in the embodiment, the front side connecting assembly 4 comprises a first front side connecting piece 41 and a second front side connecting piece 42, which are separately arranged at the two ends of the PI layer 1 along the width direction X, and the first front side connecting piece 41 and the second front side connecting piece 42 are sequentially connected with the front side copper layer 2 at the head and tail; the reverse side connecting assembly 5 comprises a first reverse side connecting piece 51 and a second reverse side connecting piece 52, which are separately arranged at the two ends of the PI layer 1 along the width direction X, and the first reverse side connecting piece 51 and the second reverse side connecting piece 52 are sequentially connected with the reverse side copper layer 3 at the head and tail, wherein the first front side connecting piece 41 and the first reverse side connecting piece 51 are one-to-one opposite, and the second front side connecting piece 42 and the second reverse side connecting piece 52 are one-to-one opposite, which further improves the connection strength at the joint and makes the flexible circuit board roll more flat, so that the two ends of the flexible circuit board in the roll-shaped structure are more flat after being wound into a roll. In the embodiment, the thickness of the first front side connecting piece 41, the thickness of the second front side connecting piece 42 and the thickness of the front side copper layer 2 are the same, and the thickness of the first reverse side connecting piece 51, the thickness of the second reverse side connecting piece 52 and the thickness of the reverse side copper layer 3 are the same. Preferably, the width dimension of the first front side connecting piece 41 and the width dimension of the first reverse side connecting piece 51 are the same. The length dimension of the first front side connecting piece 41 and the length dimension of the first reverse side connecting piece 51 are the same. The width dimension of the second front side connecting piece 42 and the width dimension of the second reverse side connecting piece 52 are the same. The length dimension of the second front side connecting piece 42 and the length dimension of the second reverse side connecting piece 52 are the same.

[0050] Optionally, the reverse side connecting assembly 5 comprises a reverse side third connecting piece 53, which is arranged between the reverse side first connecting piece 51 and the reverse side second connecting piece 52, and which is sequentially connected with the reverse side copper layer 3. The arrangement of the reverse side third connecting piece 53 makes the connection strength at the joint seam more uniform in the width direction X of the PI layer 1, avoiding the occurrence of wrinkles at the joint seam in the roll-to-roll process. In addition, since the reverse side third connecting piece 53 is added, the connection strength between the single bodies 100 is also increased, which can adapt to faster processing technology. The width dimension of the front side third connecting piece 43 is 0.5-5 mm, and the length dimension of the front side third connecting piece 43 is 1-10 mm. Preferably, the width dimension of the reverse side third connecting piece 53 can be 1-2 mm, specifically 1.5 mm. Preferably, the length dimension of the reverse side third connecting piece 53 is 1-3 mm, specifically 2 mm. Of course, the width dimension and the length dimension of the reverse side third connecting piece 53 can also be adjusted according to the actual width dimension and thickness dimension of the PI layer 1 and the roll-to-roll process.

[0051] Further, the reverse side third connecting piece 53 is provided with a plurality of reverse side third connecting pieces 53, which are all arranged between the reverse side first connecting piece 51 and the reverse side second connecting piece 52, and which are arranged at intervals along the width direction X of the PI layer 1. Preferably, the number of the reverse side third connecting pieces 53 can be reasonably selected according to the width dimension of the PI layer 1, and the interval between any two adjacent reverse side third connecting pieces 53 is as same as possible to ensure the balance of stress. Of course, if tool holes or other marking points are involved, the positions of the reverse side third connecting pieces 53 can be appropriately adjusted to avoid interference.

[0052] In order to improve the connection strength at the joint seam, in combination with the front side third connecting piece 43 and the reverse side third connecting piece 53, in the present embodiment, the front side third connecting piece 43 is provided with a plurality of front side third connecting pieces 43, which are all arranged between the front side first connecting piece 41 and the front side second connecting piece 42, and which are arranged at intervals along the width direction X of the PI layer 1; the reverse side third connecting piece 53 is provided with a plurality of reverse side third connecting pieces 53, which are all arranged between the reverse side first connecting piece 51 and the reverse side second connecting piece 52, and which are arranged at intervals along the width direction X of the PI layer 1; the projection of the front side third connecting piece 43 on the thickness direction Z of the PI layer 1 and the projection of the reverse side third connecting piece 53 on the thickness direction Z of the PI layer 1 are arranged at intervals along the width direction X of the PI layer 1, and the thickness direction Z is perpendicular to the length direction Y and the width direction X. This arrangement further strengthens the strength at the joint seam. In addition, since the front side third connecting piece 43 and the reverse side third connecting piece 53 are arranged at intervals along the width direction X of the PI layer 1, as many blades of the cutting knife as possible will be used during cutting, which can reduce the cutting thickness as much as possible while ensuring the connection strength, and is conducive to prolonging the service life of the cutting knife.

[0053] In the first embodiment of the present embodiment, the back first connecting member 51 is in the shape of a long strip. In the second embodiment of the present embodiment, the back second connecting member 52 is in the shape of a long strip. In the third embodiment of the present embodiment, the back third connecting member 53 is in the shape of a long strip. The above three embodiments can be arbitrarily combined, and seven embodiments can be combined, preferably, the back first connecting member 51, the back second connecting member 52 and the back third connecting member 53 are all in the shape of a long strip. In other words, at least the back first connecting member 51 and the back second connecting member 52 are in the shape of a long strip.

[0054] In the present embodiment, the distance between the back third connecting member 53 and the front third connecting member 43 in the width direction X is optionally the distance between any adjacent back third connecting member 53 and front third connecting member 43 is L, and 6mm≤L≤20mm.

[0055] The front connecting assembly 4 is made of copper and is integrally formed with the front copper layer 2. That is, the front first connecting member 41, the front second connecting member 42 and the front third connecting member 43 are integrally formed with the front copper layer 2. It should be noted that the gap between two adjacent front copper layers 2 does not exist before etching, and the front of the PI layer 1 is not exposed. The interval arranged front copper layer 2 is an integral structure before etching. Through the etching process, part of the copper layer at the joint is removed, leaving the front first connecting member 41, the front second connecting member 42 and the front third connecting member 43, and part of the front of the PI layer 1 is exposed.

[0056] In addition, the back connecting assembly 5 is made of copper and is integrally formed with the back copper layer 3, that is, the back first connecting member 51, the back second connecting member 52 and the back third connecting member 53 are integrally formed with the back copper layer 3. It should be noted that the gap between two adjacent back copper layers 3 does not exist before etching, and the back of the PI layer 1 is not exposed. The interval arranged back copper layer 3 is an integral structure before etching. Through the etching process, part of the copper layer at the joint is removed, leaving the back first connecting member 51, the back second connecting member 52 and the back third connecting member 53, and part of the back of the PI layer 1 is exposed.

[0057] In use, the front of the PI layer 1 can be upward or downward. When the front is upward, the cutting knife first cuts the front connecting assembly 4 and then cuts the back connecting assembly 5. When the back is upward, the cutting knife first cuts the back connecting assembly 5 and then cuts the front connecting assembly 4.

[0058] Obviously, the above embodiments of the present application are merely example for clearly explaining the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A flexible circuit board web capable of being wound into a roll, characterized in that, The application relates to a flexible circuit board roll material, which comprises the following parts: a PI layer (1) in the shape of a long strip, the PI layer (1) having a front surface and a back surface; a plurality of front copper layers (2) in the shape of long strips, the front copper layers (2) being arranged on the front surface of the PI layer (1) along the length direction (Y) of the PI layer (1); a plurality of back copper layers (3) in the shape of long strips, the back copper layers (3) being arranged on the back surface of the PI layer (1) along the length direction (Y) of the PI layer (1), and the back copper layers (3) being arranged opposite to the front copper layers (2) so that each front copper layer (2), back copper layer (3) and the PI layer (1) therebetween form a single unit (100); a front connecting assembly (4) arranged on the front surface of the PI layer (1), the front connecting assembly (4) being arranged at the joint between any two adjacent front copper layers (2), and the front connecting assembly (4) being sequentially connected to the front copper layers (2) at the head and tail, and the units (100) being connected through the PI layer (1) and the front connecting assembly (4).

2. The flexible circuit board web of claim 1, wherein, The front connecting assembly (4) comprises a front first connecting piece (41) and a front second connecting piece (42), the front first connecting piece (41) and the front second connecting piece (42) being arranged at the two ends of the PI layer (1) along the width direction (X), the front first connecting piece (41) being sequentially connected to the front copper layers (2) at the head and tail, the front second connecting piece (42) being sequentially connected to the front copper layers (2) at the head and tail, and the width direction (X) being perpendicular to the length direction (Y).

3. The flexible circuit board web of claim 2, wherein, The front connecting assembly (4) comprises a front third connecting piece (43), the front third connecting piece (43) being arranged between the front first connecting piece (41) and the front second connecting piece (42), and the front third connecting piece (43) being sequentially connected to the front copper layers (2) at the head and tail.

4. The flexible circuit board web of claim 3, wherein, The front third connecting piece (43) is provided with a plurality of front third connecting pieces (43), the front third connecting pieces (43) being arranged between the front first connecting piece (41) and the front second connecting piece (42) and being arranged at intervals along the width direction (X) of the PI layer (1).

5. The flexible circuit board web of any of claims 1-4, wherein, The flexible circuit board roll material comprises a back connecting assembly (5) arranged on the back surface of the PI layer (1), the back connecting assembly (5) being arranged at the joint between any two adjacent back copper layers (3), and the back connecting assembly (5) being sequentially connected to the back copper layers (3) at the head and tail.

6. The flexible circuit board web of claim 5, wherein, The reverse side connecting assembly (5) comprises a reverse side first connecting piece (51) and a reverse side second connecting piece (52), the reverse side first connecting piece (51) and the reverse side second connecting piece (52) are separately arranged at two ends of the PI layer (1) along the width direction (X), the reverse side first connecting piece (51) is sequentially connected with the reverse side copper layer (3) at the head and tail, and the reverse side second connecting piece (52) is sequentially connected with the reverse side copper layer (3) at the head and tail.

7. The flexible circuit board web of claim 6, wherein, The reverse side connecting assembly (5) comprises a reverse side third connecting piece (53), the reverse side third connecting piece (53) is arranged between the reverse side first connecting piece (51) and the reverse side second connecting piece (52), and the reverse side third connecting piece (53) is sequentially connected with the reverse side copper layer (3) at the head and tail.

8. The flexible circuit board web of claim 7, wherein, The reverse side third connecting piece (53) is provided with a plurality of reverse side third connecting pieces (53), and the plurality of reverse side third connecting pieces (53) are arranged between the reverse side first connecting piece (51) and the reverse side second connecting piece (52) and are arranged at intervals along the width direction (X) of the PI layer (1).

9. The flexible circuit board web of claim 8, wherein, The front side connecting assembly (4) comprises a front side first connecting piece (41), a front side second connecting piece (42) and a front side third connecting piece (43), the front side third connecting piece (43) is provided with a plurality of front side third connecting pieces (43), the plurality of front side third connecting pieces (43) are arranged between the front side first connecting piece (41) and the front side second connecting piece (42) and are arranged at intervals along the width direction (X) of the PI layer (1); the projection of the front side third connecting piece (43) on the thickness direction (Z) of the PI layer (1) and the projection of the reverse side third connecting piece (53) on the thickness direction (Z) of the PI layer (1) are staggered along the width direction (X) of the PI layer (1), and the thickness direction (Z) is perpendicular to the length direction (Y) and the width direction (X) at the same time.

10. The flexible circuit board web of any one of claims 1-4, wherein, The material of the front side connecting assembly (4) is copper, and the front side connecting assembly (4) is integrally formed with the front side copper layer (2).

Images