WO2023005111A1

WO2023005111A1 - Rigid-flex board and manufacturing method therefor

Info

Publication number: WO2023005111A1
Application number: PCT/CN2021/138232
Authority: WO
Inventors: 朱光远; 肖璐; 纪成光; 钟美娟; 袁继旺; 张志远
Original assignee: 生益电子股份有限公司
Priority date: 2021-07-27
Filing date: 2021-12-15
Publication date: 2023-02-02
Also published as: CN113573475B; CN113573475A

Abstract

The present application relates to the technical field of PCBs, and discloses a rigid-flex board and a manufacturing method therefor. The rigid-flex board comprises a flexible board, a first adhesive sheet and a first rigid board, which are sequentially laminated and pressed. The flexible board comprises a flexible region and a rigid-flex bonding region. The flexible region comprises an original flexible region and an extended flexible region. The rigid-flex bonding region comprises a first bonding region and a second bonding region, the first bonding region being connected to both sides of the flexible region in a width direction, and the second bonding region being located two sides of the extended flexible region in a length direction, separated from the extended flexible region and connected to the first bonding region on the same side. The extended flexible region is separated from the first adhesive sheet by means of an isolation layer, and during bending, the isolation layer can separate from the extended flexible region. The first rigid plate and the first adhesive sheet each have a windowed region consistent with the position and size of the original flexible region.

Description

Rigid-flex board and manufacturing method thereof

This application claims the priority of the Chinese patent application with application number 202110850888.8 submitted to the China Patent Office on July 27, 2021, the entire content of which is incorporated in this application by reference.

technical field

This application relates to the technical field of PCB (Printed Circuit Board, printed circuit board), in particular to a rigid-flex board and a manufacturing method thereof.

Background technique

Rigid-flex board is a combination of flexible circuit board and rigid circuit board through pressing and other processes to form a flexible circuit board (Flexible Printed Circuit, FPC) and a printed circuit board (Printed Circuit Board, PCB). Circuit board; because the flexible and rigid board has both a certain rigid area and a certain flexible area, and the flexible area can be bent, it has great advantages in saving the internal space of the product, reducing the volume of the finished product, and improving product performance.

However, the structure of the current rigid-flex board is shown in Figure 1, and its production method is usually: first cut off the part of the hard board corresponding to the soft area 11 of the soft board 1, and after opening a window for the bonding sheet, place the Soft board 1, bonding sheet and hard board are laminated, and then the outer circuit is made on the semi-finished product obtained by lamination.

Limited by the product installation space, and based on the structure shown in Figure 1, the width of the soft area 11 that engineers can design is relatively small, so that the bending radius of the soft area 11 is insufficient, which often leads to the failure of the flexible board 1 during assembly and use. Tear occurs at the junction of soft and hard, causing the product to be scrapped.

Contents of the invention

The purpose of the present application is to provide a rigid-flex board and its manufacturing method, so as to overcome the problem in the related art that the product is scrapped due to insufficient bending radius of the soft area.

For this purpose, the application adopts the following technical solutions:

A rigid-flex board, comprising a flexible board sequentially laminated and pressed together, a first bonding sheet and a first hard board;

The soft board includes a soft area and a soft-hard joint area bonded to the first hard board;

The soft area includes an original soft area and an extended soft area, and the extended soft area is connected to at least one side of the original soft area along the width direction;

The soft and hard joint area includes a first joint area and a second joint area, the first joint area is connected to both sides of the soft area along the width direction, and the second joint area is located on the extended soft area. Both sides of the region along the length direction are separated from the extended soft region and connected to the first bonding region on the same side;

The extended soft area is separated from the first adhesive sheet by an isolation layer, and when the soft area is bent in a direction away from the first hard plate, the isolation layer can be separated from the expanded Soft zone separation;

Both the first hard board and the first adhesive sheet have a window area, and the position and size of the window area are consistent with the original soft area.

Optionally, the isolation layer is a single-sided adhesive tape, and the adhesive side of the single-sided adhesive tape is bonded to the first bonding sheet.

Optionally, the isolation layer is a double-sided tape, the adhesive side with a higher viscosity of the double-sided tape is bonded to the first adhesive sheet, and the adhesive side with a lower viscosity of the double-sided tape When the soft zone is in a non-bent state, it is attached to the extended soft zone, and when the soft zone is in a bent state, it is separated from the extended soft zone.

Optionally, it also includes a second hard board and a second adhesive sheet; the second adhesive sheet and the second hard board are alternately stacked and pressed on the side of the first hard board that is away from the soft board. One side: the position and size of the window opening area of the second hard board and the second adhesive sheet are consistent with the original soft area.

A method for manufacturing a rigid-flex board, the method comprising:

providing at least the soft board, the first bonding sheet, the first hard board and the isolation layer;

The plates are laminated and pressed in order, so that the first hard board, the first adhesive sheet and the soft board are stacked sequentially, and the isolation layer is stacked on the first adhesive sheet and the soft board. Between districts;

removing waste areas of the soft board located on both sides of the original soft area along the length direction;

Uncover the designated area of the first hard board and the first bonding sheet and remove the exposed part of the isolation layer after opening the cover, the position of the designated area is consistent with the preset production of the original soft area The positions are consistent, and the size of the designated area is consistent with the preset production size of the original soft area;

Controlled depth milling is performed along the preset boundary line between the extended soft zone and the second bonding zone, so that the expanded soft zone is separated from the second bonding zones on both sides.

Optionally, the isolation layer stacked between the first adhesive sheet and the soft zone includes: a first isolation zone that is in the same position as the original soft zone, and a first zone that is consistent with the expanded soft zone. The second isolation partition with the same sexual zone location;

Along the length direction, the first isolation partition is larger than the original soft zone by a first value on one side, and the second isolation partition is smaller than the extended soft zone by a second value on one side; the first value is greater than said second value;

Along the width direction, the isolation layer is smaller than the soft area on one side by a second value.

Optionally, the isolation layer is a single-sided adhesive tape;

The pressing of laminated plates in sequence includes:

adhering the adhesive side of the single-sided adhesive tape to the surface of the first bonding sheet in advance;

removing the invalid area of the single-sided tape, retaining the effective area of the single-sided tape, the position of the effective area is consistent with the position of the soft area;

The first hard board, the first bonding sheet bonded with the single-sided adhesive tape, and the soft board are laminated and pressed sequentially.

Optionally, the isolation layer is a double-sided adhesive tape;

The pressing of laminated plates in sequence includes:

Paste the adhesive side with higher viscosity of the double-sided tape in advance to the surface of the first bonding sheet facing the soft board; an adhesive surface, attached to the surface of the soft board facing the first bonding sheet;

Removing the invalid area of the double-sided tape, retaining the effective area of the double-sided tape, the position of the effective area is consistent with the position of the soft area;

The first hard board, the first bonding sheet, and the soft board are sequentially stacked and pressed together.

Optionally, it also includes: providing a second hard board and a second adhesive sheet, and laminating the second adhesive sheet and the second hard board alternately on the side of the first hard board that is away from the one side of the soft board;

While opening the designated area of the first hard board and the first adhesive sheet, the designated area of the second hard board and the second adhesive sheet is opened.

Optionally, the width of the extended soft area is smaller than the width of the original soft area, and the length of the extended soft area is equal to the length of the original soft area.

Compared with related technologies, the beneficial effects of the present application are:

In the embodiment of the present application, a small portion of the bonding area connected to the original soft area is divided from the original soft-hard bonding area, and then the small portion of the bonding area is separated from other soft-hard bonding areas on both sides of the length direction, so that the small portion The combined area is transformed into an extended soft area that can be bent together with the original soft area, that is, the extended soft area is added on the basis of the conventional original soft area, the overall width of the soft area is enlarged, and the soft area is increased. The one-way bend radius in the flexible zone reduces the risk of product tearing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or related technologies. The accompanying drawings in the following description are only some of the applications Embodiments, those skilled in the art can also obtain other drawings based on these drawings.

Figure 1 is a side view of a rigid-flex board;

Figure 2 is a side view of the first rigid-flex board provided in the embodiment of the present application;

Fig. 3 is a comparative top view of the soft board provided by the embodiment of the present application before and after processing;

Fig. 4 is a side view of the second rigid-flex board provided in the embodiment of the present application;

Fig. 5 is a side view of the third rigid-flex board provided in the embodiment of the present application;

Fig. 6 is a flow chart of the manufacturing method of the rigid-flex board provided in the embodiment of the present application;

Fig. 7 is a schematic diagram of the manufacturing process of the rigid-flex board provided in the embodiment of the present application;

FIG. 8 is a schematic diagram of the width of the isolation region of the isolation layer provided by the embodiment of the present application;

9 is a schematic diagram of the length of the isolation region of the isolation layer provided by the embodiment of the present application;

Fig. 10 is a flow chart of the stacking lamination method provided by the embodiment of the present application when the isolation layer is a single-sided adhesive tape;

Fig. 11 is a flow chart of the method for laminating laminated boards provided by the embodiment of the present application when the isolation layer is a double-sided adhesive tape.

Graphical description:

1. Soft board; 2. First hard board; 3. First bonding sheet; 4. Second hard board; 5. Second bonding sheet; 6. Isolation layer; 11. Soft area; 12. Soft and hard 13. Waste area; 14. Preset edge line; 111. Original soft area; 112. Extended soft area; 121. First combined area; 122. Second combined area; 61. First isolation partition; 62. The second isolated partition.

Detailed ways

In order to make the purpose, features, and advantages of the application more obvious and understandable, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the following The described embodiments are only some of the embodiments of the present application, but not all of them.

In order to solve the problem that the product is prone to tearing during bending and use due to the limited design value of the width of the flexible region 11 of the soft-rigid combination board, the embodiment of the present application provides a soft-hard combination board that can utilize the soft-hard The bonding area 12 expands the soft area 11 to increase the bendable width of the soft area 11, thereby increasing the bending radius of the product and reducing the probability of the product being torn at the boundary between soft and hard.

Please refer to FIG. 2 and FIG. 3 , a rigid-flex board provided by the embodiment of the present application includes: a flexible board 1 , a first adhesive sheet 3 and a first rigid board 2 which are sequentially laminated and pressed together.

The flexible board 1 includes an exposed flexible area 11 and a soft-hard joint area 12 for bonding with the first rigid board 2 . The soft area 11 includes an original soft area 111 and an extended soft area 112, and the extended soft area 112 is connected to one side of the original soft area 111 along the width direction. The soft and hard joint area 12 includes a first joint area 121 and a second joint area 122. The first joint area 121 is connected to both sides of the soft area 11 along the width direction, and the second joint area 122 is located on the edge of the extended soft area 112. Both sides in the length direction are separated from the extended soft zone 112 and connected to the first bonding zone 121 on the same side.

The extended soft area 112 is separated from the first bonding sheet 3 by the isolation layer 6, and the isolation layer 6 can be separated from the extended soft area 112 when the soft area 11 is bent in a direction away from the first hard board 2. separate.

Both the first hard board 2 and the first bonding sheet 3 have a window area, and the position and size of the window area are consistent with the original soft area 111 .

It should be noted that, in this embodiment, the width direction and the length direction are located in the same plane perpendicular to the pressing direction of the laminated boards, and the two are perpendicular to each other. Wherein, the width direction refers to: in the structure shown in Figure 1, with the soft zone 11 as the boundary, the soft and hard joint zone 12 on one side points to the direction of the soft and hard joint zone 12 on the other side; therefore, the soft zone The width of 11 in the width direction determines its bending radius.

It can be understood that the rigid-flex board of the embodiment of the present application can realize two-way bending. When the soft area 11 is bent in a direction away from the first hard board 2, the bendable width of the soft area 11 is The sum of the widths of the original soft zone 111 and the expanded soft zone 112; when the soft zone 11 is bent toward the direction of the first hard plate 2, the bendable width of the soft zone 11 is the original soft zone 111 width.

Compared with the traditional rigid-flex board shown in Figure 1, the soft-rigid board of the embodiment of the present application provides a soft area 11, which adds an extended soft area 112 on the basis of the conventional original soft area 111, The overall width of the soft area 11 is enlarged, and at the same time, since one side of the soft area 11 is not covered by a hard board and the other side is partially covered by a hard board, the soft area 11 bends away from the first hard board 2. The bending direction during folding increases the one-way bending radius of the soft zone 11 in the bending direction, thereby reducing the risk of product tearing.

Moreover, the embodiment of the present application provides a soft area extension method, specifically: divide the original soft and hard joint area 12 into a small part of the joint area connected to the original soft area 111, and then combine the small part of the joint area with the length The other soft and hard bonding areas 12 (i.e. the second bonding area 122) on both sides of the direction are separated, and at the same time, the small part of the bonding area is separated from the first bonding sheet 3 at the bottom through the isolation layer 6, thereby transforming the small part of the bonding area It is the extended soft area 112 capable of bending together with the original soft area 111 .

Based on this flexible region expansion method, compared with the traditional rigid-flex board shown in Figure 1, when making the rigid-flex board of the embodiment of the application, for other components other than the flexible board 1, it is only necessary to add one and The expansion of the isolation layer 6 matched with the soft area 112 does not require any adjustments to the position and size of the opening area of the hard board. Therefore, under the same manufacturing conditions, the embodiment of the present application can simply and effectively increase the bending radius of the soft region 11 without increasing other costs.

Please refer to Fig. 4, the embodiment of the present application provides yet another rigid-flex board, which differs from the structure shown in Fig. 2 in that: the two sides of the original flexible region 111 along the width direction are respectively connected with an extended flexible region 112. The other structures are the same as those in Fig. 2 and will not be repeated here.

At this time, the overall width of the soft zone 11 is the sum of the widths of the original soft zone 111 and the two extended soft zones 112 , thereby further increasing the one-way bending width of the soft zone 11 .

Please refer to Fig. 5, the embodiment of the present application provides another rigid-flex board, which differs from the structure shown in Fig. 2 in that it also includes a second hard board 4 and a second bonding sheet 5; the second bonding sheet 5 and the second hard board 4 are alternately stacked and pressed on the side of the first hard board 2 away from the soft board 1; The location and size are the same.

Compared with the structure shown in Figure 2, the rigid-flex board increases the number of hard boards, which can be selected according to actual design requirements in practical applications.

In order to make the above-mentioned rigid-flex board, please refer to Figure 6 and Figure 7, the embodiment of the present application also provides a method for manufacturing a rigid-flex board, including steps:

Step 101 , providing at least a soft board 1 , a first bonding sheet 3 , a first hard board 2 and an isolation layer 6 .

The flexible board 1 to be produced includes a connected flexible area 11 and a soft-hard joint area 12. The flexible area 11 includes an original flexible area 111 and an extended flexible area 112. The extended flexible area 112 is connected to the original flexible area 111. at least one side along the width direction.

In this step, it is necessary to determine the design information of each part of the flexible board 1 , including the preset manufacturing position and preset manufacturing size.

Step 102, stacking and pressing the boards sequentially, so that the first hard board 2, the first adhesive sheet 3 and the soft board 1 are stacked sequentially, and the isolation layer 6 is stacked on the soft board between the first adhesive sheet 3 and the soft board 1. between sex zone 11.

Step 103 , removing the waste areas 13 of the flexible board 1 located on both sides of the original flexible area 111 along the length direction.

Step 104: Uncover the specified area of the first hard board 2 and the first adhesive sheet 3 and remove the exposed part of the isolation layer 6 after the cover is opened, the position of the specified area is consistent with the preset production position of the original soft area 111, The size of the specified area is consistent with the preset production size of the original soft area 111 .

Step 105: Carry out controlled depth milling along the preset boundary line 14 between the extended soft zone 112 and the second joint zone 122, so that the expanded soft zone 112 is separated from the second joint zones 122 on both sides, as shown in FIG. 3 .

After separating the extended flexible region 112 from the second bonding region 122 of the soft-hard bonding region 12, the extended flexible region 112 is only connected to the first bonding region 121 of the soft-hard bonding region 12 and the original bonding region 12 on both sides in the width direction. The soft zone 111, and because the inner layer of the expanded flexible zone 112 is isolated from the first bonding sheet by the isolation layer 6, the expanded flexible zone 112 fails to bond with the first hard board 2 of the bottom layer, so the expanded flexible zone 112 can be bent simultaneously with the original soft area 111 without being constrained by the soft-hard joint area 12 of the same layer and the first hard board 2 of the bottom layer.

Since the depth of controlled depth milling for the soft zone 11 is small, in order to improve the precision of controlled depth, laser controlled depth can be used.

It should be noted that, the execution order of each operation step in the manufacturing method of the embodiment of the present application is not limited to the above-mentioned order, and the execution order of some steps can be flexibly adjusted according to the actual situation in practical applications.

Further, as shown in Figure 8 and Figure 9, in the stacking process, the entire isolation area of the isolation layer 6 stacked between the first adhesive sheet 3 and the soft area 11 can be divided into: 111 is the first isolated partition 61 in the same position, and the second isolated partition 62 is in the same position as the extended soft zone 112 .

Along the length direction, the first isolation zone 61 is larger than the original soft zone 111 by a first value on one side, and the second isolation zone 62 is smaller than the extended soft zone 112 by a second value on one side; the first value is greater than the second value; along the width direction, the entire isolation layer 6 is unilaterally smaller than the entire soft region 11 by a second value.

This is because, the two sides along the longitudinal direction of the single side of the expanded soft area 112 are waste areas 13, which will be milled off later, so in order to facilitate the subsequent opening of the first hard board 2, the isolation layer can be suitably The second isolation zone 62 of 6 expands along the length direction, so as to avoid the difficulty of opening the cover due to the hard board part in the cover opening area being glued to the soft board 1. At the same time, in order to prevent the isolation layer 6 from entering the surface of the first hard board 2 and affecting its graphic circuit, the entire isolation layer 6 is slightly smaller than the entire soft region 11 along the width direction.

Exemplarily, the entire isolation region of the isolation layer 6 in the width direction is 0.2 mm smaller than the entire soft region 11 on a single side, and the first isolation zone 61 of the isolation layer 6 is 2 mm larger than the original soft region 111 on a single side along the length direction. The second isolation zone 62 of the isolation layer 6 in the longitudinal direction is 0.2 mm smaller than the extended soft area 112 on a single side.

It should be noted that, in the structure of the flexible board 1 shown in Figure 2 and Figure 3, only one side of the original flexible area 111 is provided with the expanded flexible area 112, and the width of the expanded flexible area 112 is smaller than that of the original flexible area 111 The width of the extended soft zone 112 is equal to the length of the original soft zone 111 . Based on this, the isolation structure of the isolation layer 6 is shown in FIG. 8 and FIG. 9 , and the isolation region as a whole presents a convex structure. In fact, the present application does not limit the specific shape and size of the extended soft region 112 and the original soft region 111 , they can be flexibly designed according to actual needs, and at the same time, the isolation area of the isolation layer 6 can be adaptively adjusted.

In a possible implementation, the isolation layer 6 is a single-sided adhesive tape, as shown in Figure 10, the method of stacking and pressing the plates sequentially in step 102 is:

Step 201 , attaching the adhesive side of the single-sided tape to the surface of the first bonding sheet 3 in advance.

In this step, the single-sided adhesive tape that is as large as the first adhesive sheet 3 can be cut first, and the single-sided adhesive tape is attached to the surface of the first adhesive sheet 3, and the first adhesive sheet 3 is used as a carrier, not only It is convenient for the graphic production of single-sided tape, and it is also convenient for the subsequent pressing operation of laminated boards.

Step 202, remove the invalid area of the single-sided tape, and keep the effective area of the single-sided tape, the position of the effective area is consistent with the position of the soft area 11.

Specifically, laser cutting can be used to cut the single-sided tape along the boundary line between the effective area and the invalid area, and then tear off the invalid area of the single-sided tape.

Step 203 , stacking and pressing the first rigid board 2 , the first adhesive sheet 3 bonded with the single-sided adhesive tape, and the soft board 1 in sequence.

In another possible implementation, the isolation layer 6 is a double-sided adhesive tape, as shown in Figure 11, the method of sequentially stacking and pressing the plates in step 102 is:

Step 301, pre-attach the viscose side of the double-sided tape with a higher viscosity to the surface of the first adhesive sheet 3 facing the flexible board 1; or, pre-attach the viscose side of the double-sided tape with a lower viscosity, Attached to the surface of the soft board 1 facing the first adhesive sheet 3 .

Step 302 , remove the invalid area of the single-sided tape, and keep the effective area of the single-sided tape, the position of the effective area is consistent with the position of the soft area 11 .

Step 303 , stacking and pressing the first hard board 2 , the first adhesive sheet 3 , and the soft board 1 sequentially.

Of course, in other embodiments, other carriers can also be used to carry the isolation layer 6 and the isolation layer 6 can be processed to form a pattern matching the soft area 11, and then the isolation layer 6 can be transferred to the first bonding sheet when stacking the boards. 3 and the soft area 11 of the soft board 1, and then press them together.

In addition, the above manufacturing method may also include: providing the second hard board 4 and the second bonding sheet 5, and alternately laminating and pressing the second bonding sheet 5 and the second hard board 4 on the soft side facing away from the first hard board 2 . One side of the board 1; while opening the designated area of the first hard board 2, the designated area of the second hard board 4 and the second bonding sheet 5 are opened. In this way, the number of hard boards can be designed according to actual needs.

Claims

A rigid-flex board, comprising a flexible board sequentially laminated and pressed together, a first bonding sheet and a first hard board;

The soft board includes a soft area and a soft-hard joint area bonded to the first hard board;

The soft area includes an original soft area and an extended soft area, and the extended soft area is connected to at least one side of the original soft area along the width direction;

The soft and hard joint area includes a first joint area and a second joint area, the first joint area is connected to both sides of the soft area along the width direction, and the second joint area is located on the extended soft area. Both sides of the region along the length direction are separated from the extended soft region and connected to the first bonding region on the same side;

The extended soft area is separated from the first adhesive sheet by an isolation layer, and when the soft area is bent in a direction away from the first hard plate, the isolation layer can be separated from the expanded Soft zone separation;

Both the first hard board and the first adhesive sheet have a window area, and the position and size of the window area are consistent with the original soft area.
The rigid-flex board according to claim 1, wherein the isolation layer is a single-sided tape, and the adhesive surface of the single-sided tape is bonded to the first bonding sheet.
The rigid-flex board according to claim 1, wherein the isolation layer is a double-sided adhesive tape, and the viscous adhesive surface of the double-sided adhesive tape is bonded to the first adhesive sheet, and the double-sided adhesive tape The less viscous adhesive surface of the adhesive tape is attached to the extended soft area when the soft area is in a non-bent state, and is separated from the extended soft area when the soft area is in a bent state.
The rigid-flex board according to claim 1, further comprising a second hard board and a second adhesive sheet; the second adhesive sheet and the second hard board are alternately laminated and pressed onto the first hard board The side of the second hard board and the window opening area of the second adhesive sheet are consistent with the position and size of the original soft area.
A method for manufacturing a rigid-flex board, comprising:

providing at least the soft board, the first bonding sheet, the first hard board and the isolation layer;

The plates are laminated and pressed in order, so that the first hard board, the first adhesive sheet and the soft board are stacked sequentially, and the isolation layer is stacked on the first adhesive sheet and the soft board. Between districts;

removing waste areas of the soft board located on both sides of the original soft area along the length direction;

Uncover the designated area of the first hard board and the first bonding sheet and remove the exposed part of the isolation layer after opening the cover, the position of the designated area is consistent with the preset production of the original soft area The positions are consistent, and the size of the designated area is consistent with the preset production size of the original soft area;

Controlled depth milling is performed along the preset boundary line between the extended soft zone and the second bonding zone, so that the expanded soft zone is separated from the second bonding zones on both sides.
The method for making a rigid-flex board according to claim 5, wherein the isolation layer stacked between the first bonding sheet and the soft area includes: a consistent first isolation partition, and a second isolation partition consistent with the location of the extended soft zone;

Along the length direction, the first isolation partition is larger than the original soft zone by a first value on one side, and the second isolation partition is smaller than the extended soft zone by a second value on one side; the first value is greater than said second value;

Along the width direction, the isolation layer is smaller than the soft area on one side by a second value.
The method for making a rigid-flex board according to claim 5, wherein the isolation layer is a single-sided adhesive tape;

The pressing of laminated plates in sequence includes:

adhering the adhesive side of the single-sided adhesive tape to the surface of the first bonding sheet in advance;

removing the invalid area of the single-sided tape, retaining the effective area of the single-sided tape, the position of the effective area is consistent with the position of the soft area;

The first hard board, the first bonding sheet bonded with the single-sided adhesive tape, and the soft board are laminated and pressed sequentially.
The method for making a rigid-flex board according to claim 5, wherein the isolation layer is a double-sided adhesive tape;

Paste the adhesive side with higher viscosity of the double-sided tape in advance to the surface of the first bonding sheet facing the soft board; an adhesive surface, attached to the surface of the soft board facing the first bonding sheet;

Removing the invalid area of the double-sided tape, retaining the effective area of the double-sided tape, the position of the effective area is consistent with the position of the soft area;

The first hard board, the first bonding sheet, and the soft board are sequentially stacked and pressed together.
The method for making a rigid-flex board according to claim 5, further comprising: providing a second hard board and a second adhesive sheet, and laminating the second adhesive sheet and the second hard board alternately on the side of the first hard board facing away from the soft board;

While opening the designated area of the first hard board and the first adhesive sheet, the designated area of the second hard board and the second adhesive sheet is opened.
The method for manufacturing a rigid-flex board according to claim 5, wherein the width of the expanded flexible zone is smaller than the width of the original flexible zone, and the length of the expanded flexible zone is equal to the original flexible zone length.