Flexible circuit board and electronic equipment

Abstract

The utility model provides a flexible circuit board and electronic equipment, and the flexible circuit board comprises a flexible circuit board body which comprises a non-bending region and a bending region which are connected with each other; the two electromagnetic shielding films cover the two sides of the flexible circuit board body in the thickness direction respectively, each electromagnetic shielding film comprises a first film body and a second film body which are connected, the first film body covers the non-bending area, the second film body covers the bending area, at least one side of the second film body is provided with a connecting part, and at least one side of the bending area is provided with a connecting part. And the two oppositely arranged connecting parts are jointed. Through the arrangement, the second film body does not need to be bonded with the bending area, the hardness of the flexible circuit board in the bending area is not increased, and the bending performance of the flexible circuit board and the shielding performance of the electromagnetic shielding film are both considered; moreover, in the process of assembling the flexible circuit board in the electronic equipment, not only is the assembly difficulty of the flexible circuit board reduced, but also the line breaking risk of the flexible circuit board is greatly reduced.

Description

Technical Field

[0001] This application relates to the technical field of circuit boards, and particularly relates to a flexible circuit board and an electronic device. Background Art

[0002] A flexible printed circuit (FPC) is a printed circuit board made of polyimide or polyester film as the substrate, which has high reliability and excellent flexibility. The flexible circuit board has the characteristics of high wiring density, light weight, thin thickness, and good bendability, and is applied to wearable devices, flexible displays, and intelligent electronic devices.

[0003] In the scenario of high-speed data transmission of a flexible circuit board, the signals of the flexible circuit board generate relatively large electromagnetic wave radiation, which interferes with the antennas in the nearby similar frequency bands; at the same time, the electromagnetic waves radiated by other key circuits during operation may also affect the signal transmission inside the flexible circuit board. The electromagnetic shielding film can block the penetration of electromagnetic waves and prevent the signals of the flexible circuit board from interfering with other signals inside the device, playing an electromagnetic shielding role. In order to make the shielding effect better, an electromagnetic shielding film also needs to be attached to the bending area of the flexible circuit board. However, due to the relatively high requirements for hardness and resilience in the bending area, and the thickness of the flexible circuit board increases after attaching the electromagnetic shielding film, the hardness and resilience of the bending area also become larger, which is not conducive to bending, increases the assembly difficulty, and even causes the risk of wire breakage.

[0004] In the related art, most use an electromagnetic shielding film with a simple structure and a relatively thin thickness to replace the traditional electromagnetic shielding film. However, reducing the thickness of the conductive material layer will reduce the conductivity, which cannot effectively prevent the mutual interference between signals, and still affects the assembly difficulty of the flexible circuit board in the device. Summary of the Utility Model

[0005] In view of this, this application provides a flexible circuit board and an electronic device, which can balance the bending performance of the flexible circuit board and the shielding performance of the electromagnetic shielding film.

[0006] Specifically, the following technical solutions are included:

[0007] In a first aspect, an embodiment of this application provides a flexible circuit board, including:

[0008] A flexible circuit board body, including a non-bending area and a bending area, and the bending area is connected to the non-bending area;

[0009] Two electromagnetic shielding films are respectively covered on both sides of the flexible circuit board body in the thickness direction. Each electromagnetic shielding film includes a connected first film body and a second film body. The first film body covers the non-bending area, and the second film body covers the bending area. A connecting portion is provided on at least one side of the second film body, and at least on one side of the bending area, two oppositely arranged connecting portions are joined.

[0010] In an alternative embodiment, the first film body and the non-bending area are adhesively bonded to each other.

[0011] In an alternative embodiment, at least on one side of the bending area, two oppositely arranged connecting portions are adhesively bonded to each other.

[0012] In an alternative embodiment, the first film body and the non-bending area are adhesively bonded by a conductive adhesive, and / or at least on one side of the bending area, two oppositely arranged connecting portions are adhesively bonded by a conductive adhesive.

[0013] In an alternative embodiment, the connecting portions of each electromagnetic shielding film are multiple, and two of the connecting portions in each electromagnetic shielding film are respectively located on both sides of the flexible circuit board body in the width direction.

[0014] In an alternative embodiment, the second film body is in direct contact with the bending area.

[0015] In an alternative embodiment, the width of the connecting portion is 3 mm to 5 mm.

[0016] In an alternative embodiment, the side edge of the second film body facing away from the first film body is flush with one side edge of the flexible circuit board body in the length direction.

[0017] In an alternative embodiment, the shape and size of the first film body respectively match the shape and size of the non-bending area.

[0018] In an alternative embodiment, the flexible circuit board further includes a board-to-board connector, and the board-to-board connector is connected to at least one of the bending areas.

[0019] In a second aspect, an embodiment of the present application provides an electronic device, and the electronic device includes the flexible circuit board provided in any one of the embodiments of the first aspect.

[0020] The beneficial effects of the technical solution provided by the embodiments of the present application at least include: by providing that at least on one side of the bending area, two oppositely arranged connecting parts are joined, the second film body does not need to be bonded to the bending area, which will not increase the hardness of the flexible circuit board in the bending area, taking into account both the bending performance of the flexible circuit board and the shielding performance of the electromagnetic shielding film; and, during the process of assembling the flexible circuit board into an electronic device, it is not only beneficial to reduce the assembly difficulty of the flexible circuit board, but also greatly reduces the risk of disconnection of the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the flexible circuit board provided by the embodiments of the present application;

[0023] Figure 2 It is a schematic structural diagram of the flexible circuit board body provided by the embodiments of the present application;

[0024] Figure 3 It is a schematic structural diagram of the electromagnetic shielding film provided by the embodiments of the present application;

[0025] Figure 4 It is a partial schematic diagram of the flexible circuit board provided by the embodiments of the present application.

[0026] The reference numerals in the drawings respectively represent:

[0027] 1 - flexible circuit board; 11 - flexible circuit board body; 11a - non - bending area; 11b - bending area; 12 - electromagnetic shielding film; 121 - first film body; 122 - second film body; 123 - connecting part; 13 - board - to - board connector.

[0028] Through the above - mentioned drawings, the clear embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and the text description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. 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 of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0030] For the orientation terms involved in the embodiments of the present application, such as "upper", "lower", "side", etc., generally take the relative relationship of the orientation shown in Figure 1 as the reference, and the use of these orientation terms is only to more clearly describe the relationship between the structures and the structures, rather than to describe the absolute orientation. When the product is placed in different postures, the orientation may change. For example, "upper" and "lower" may be interchanged.

[0031] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meaning as commonly understood by those of ordinary skill in the art. Some technical terms that appear in the embodiments of the present application are described below.

[0032] To make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0033] As Figures 1 to 4 shown, the embodiment of the present application provides a flexible circuit board 1, including a flexible circuit board body 11 and two electromagnetic shielding films 12.

[0034] The flexible circuit board body 11 includes a non-bending area 11a and a bending area 11b, and the non-bending area 11a and the bending area 11b are connected. Exemplarily, the bending area 11b is located on at least one side in the length direction of the non-bending area 11a.

[0035] For example Figure 2 shown, the flexible circuit board body 11 is in a rectangular strip shape, Figures 1 to 3 the horizontal direction in Figures 1 to 3 is the width direction of the flexible circuit board body 11,

[0036] As Figure 1 and Figure 3As shown, two electromagnetic shielding films 12 respectively cover both sides of the flexible circuit board body 11 in the thickness direction. Each electromagnetic shielding film 12 includes a connected first film body 121 and a second film body 122. The first film body 121 covers the non-bending area 11a, and the second film body 122 covers the bending area 11b. At least one side of the second film body 122 is provided with a connecting portion 123, and at least on one side of the bending area 11b, two oppositely arranged connecting portions 123 are joined together.

[0037] Specifically, at least one side of each second film body 122 protrudes outward relative to the side edge of the flexible circuit board body 11 to form the connecting portion 123.

[0038] Further, the second film body 122 is rectangular, and the width of the second film body 122 is greater than the width of the flexible circuit board body 11, so that at least one side of the second film body 122 in the width direction of the flexible circuit board 1 protrudes outward relative to the side edge of the flexible circuit board body 11; and / or, the length of the second film body 122 is greater than the length of the flexible circuit board body 11, so that one side of the second film body 122 in the length direction of the flexible circuit board 1 protrudes outward relative to the side edge of the flexible circuit board body 11. It can be understood that the width of the second film body 122 is the dimension of the second film body 122 in the width direction of the flexible circuit board 1, and the length of the second film body 122 is the dimension of the second film body 122 in the length direction of the flexible circuit board 1.

[0039] Exemplarily, the connecting portion 123 is located on the side of the bending area 11b. For example, the connecting portion 123 is located on the side of the bending area 11b along the width direction of the flexible circuit board 1, or the connecting portion 123 is located on the side of the bending area 11b along the length direction of the flexible circuit board 1, or the connecting portion 123 is located on the side of the bending area 11b along the thickness direction of the flexible circuit board 1.

[0040] At least on one side of the bending area 11b, each bending area 11b is correspondingly provided with two second film bodies 122 arranged oppositely along the thickness direction of the flexible circuit board 1. The connecting portion 123 connects the two oppositely arranged second film bodies 122 together, so that the second film body 122 closely wraps the bending area 11b, avoiding the second film body 122 from warping relative to the bending area 11b and affecting the electromagnetic shielding effect of the bending area 11b.

[0041] Among them, since the connecting portion 123 is located on the side of the bending area 11b, the second film body 122 can not only cover the bending area 11b, but also does not need to be bonded to the bending area 11b, eliminating the adhesive between the second film body 122 and the bending area 11b. Compared with the prior art in which the electromagnetic shielding film 12 is bonded to the bending area 11b, the flexible circuit board 1 provided by the embodiment of the present application will not additionally increase the hardness of the bending area 11b, so it does not affect the bending performance of the bending area 11b, which is conducive to reducing the assembly difficulty of the flexible circuit board 1 in the electronic device and improving the assembly efficiency.

[0042] Exemplarily, the area of the first film body 121 is greater than or equal to the sum of the areas of the two surfaces on both sides of the non-bending area 11a in the thickness direction, so that the first film body 121 fully covers the non-bending area 11a and ensures the electromagnetic shielding effect of the non-bending area 11a.

[0043] The flexible circuit board 1 provided by the embodiment of the present application is provided with at least one side of the bending area 11b where two oppositely arranged connecting portions 123 are joined, so that the second film body 122 does not need to be bonded to the bending area 11b, and does not increase the hardness of the flexible circuit board 1 in the bending area 11b, taking into account the bending performance of the flexible circuit board 1 and the shielding performance of the electromagnetic shielding film 12; and, during the process of assembling the flexible circuit board 1 into the electronic device, it is not only beneficial to reduce the assembly difficulty of the flexible circuit board 1, but also greatly reduces the risk of disconnection of the flexible circuit board 1.

[0044] In a specific embodiment, the first film body 121 and the non-bending area 11a are bonded to each other to realize the connection between the flexible circuit board body 11 and the electromagnetic shielding film 12, and prevent the electromagnetic shielding film 12 from shifting relative to the flexible circuit board body 11.

[0045] In a specific embodiment, at least on one side of the bending area 11b, two oppositely arranged connecting portions 123 are bonded to each other, with a simple and firm structure and convenient processing operation.

[0046] In a further embodiment, the first film body 121 and the non-bending area 11a are bonded by a conductive adhesive, and / or at least on one side of the bending area 11b, two oppositely arranged connecting portions 123 are bonded by a conductive adhesive, so as to simultaneously realize the functions of conduction and bonding fixation through the conductive adhesive.

[0047] In a further embodiment, each connecting portion 123 of each electromagnetic shielding film 12 is multiple, and two of the connecting portions 123 in each electromagnetic shielding film 12 are respectively located on both sides of the flexible circuit board body 11 in the width direction.

[0048] Exemplarily, such as Figure 1As shown, both the left and right sides of the second film body 122 extend outward relative to the flexible circuit board body 11, that is, both sides of the second film body 122 in the width direction of the flexible circuit board 1 protrude outward relative to the side edges of the flexible circuit board body 11, forming the connecting portions 123, so that the second film body 122 closely covers the bending area 11b without increasing the hardness of the flexible circuit board 1 in the bending area 11b.

[0049] In a specific embodiment, the second film body 122 is in direct contact with the bending area 11b, and no adhesive is coated between them to prevent increasing the hardness of the flexible circuit board 1 in the bending area 11b.

[0050] In a specific embodiment, the width of the connecting portion 123 is 3 mm to 5 mm, which reduces the space occupied in the width direction of the flexible circuit board 1 while ensuring the connection strength between the two relatively arranged second film bodies 122. It can be understood that the width of the connecting portion 123 is the distance by which the connecting portion 123 protrudes outward relative to the flexible circuit board body 11.

[0051] In an embodiment, one side edge of the second film body 122 facing away from the first film body 121 is flush with one side edge of the flexible circuit board body 11 in the length direction.

[0052] It can be understood that one side edge of the second film body 122 facing away from the first film body 121 is the side edge of the second film body 122 facing away from the first film body 121 in the length direction of the flexible circuit board 1. For example Figure 1 the upper edge of the second film body 122 located above and the lower edge of the second film body 122 located below in.

[0053] By setting one side edge of the second film body 122 facing away from the first film body 121 to be flush with one side edge of the flexible circuit board body 11 in the length direction, while ensuring the electromagnetic shielding effect of the electromagnetic shielding film 12 on the bending area 11b, it avoids hindering the connection between the end of the flexible circuit board body 11 and other components.

[0054] For example, the flexible circuit board 1 further includes a board-to-board connector 13, and the board-to-board connector 13 is connected to at least one bending area 11b. For example Figure 1 as shown, there are two board-to-board connectors 13, and the two board-to-board connectors 13 are respectively located on both sides of the flexible circuit board body 11 in the length direction.

[0055] As Figure 4 shown, since one side edge of the second film body 122 facing away from the first film body 121 is flush with one side edge of the flexible circuit board body 11 in the length direction, the second film body 122 does not cover the board-to-board connector 13, thus avoiding hindering the connection between the end of the flexible circuit board body 11 and the board-to-board connector 13.

[0056] In one embodiment, the shape and size of the first film body 121 respectively match the shape and size of the non-bending area 11a.

[0057] Specifically, both the shape of the first film body 121 and the shape of the non-bending area 11a are rectangular strips; the adaptation of the size of the first film body 121 and the size of the non-bending area 11a is reflected in that: the length of the first film body 121 is equal to the length of the non-bending area 11a, and the width of the first film body 121 is equal to the width of the non-bending area 11a. It can be understood that the length of the first film body 121 is the size of the first film body 121 in the length direction of the flexible circuit board 1, and the width of the first film body 121 is the size of the first film body 121 in the width direction of the flexible circuit board 1.

[0058] In this embodiment, by setting the shape and size of the first film body 121 to respectively match the shape and size of the non-bending area 11a, each first film body 121 can exactly cover one surface of the non-bending area 11a, while ensuring the electromagnetic shielding effect on the non-bending area 11a, saving material costs and occupied space.

[0059] The embodiment of the present application also provides an electronic device, including the flexible circuit board 1 provided in any of the above embodiments. Exemplarily, the electronic device is a mobile phone, a tablet computer, a notebook computer, a driving recorder, a wearable device, a virtual reality device, etc.

[0060] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

[0061] Those skilled in the art will readily think of other implementation schemes of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses, or adaptive changes of the present application, and these variations, uses, or adaptive changes follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary.

[0062] It should be understood that the present application is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A flexible circuit board (1), characterized in that: The flexible circuit board (1) comprises: A flexible circuit board body (11) comprises a non-bending area (11a) and a bending area (11b), wherein the bending area (11b) is connected to the non-bending area (11a); Two electromagnetic shielding films (12) are respectively covered on both sides of the flexible circuit board body (11) in the thickness direction, each of the electromagnetic shielding films (12) comprises a first film body (121) and a second film body (122) connected to each other, the first film body (121) covers the non-bending area (11a), the second film body (122) covers the bending area (11b), at least one side of the second film body (122) is provided with a connecting portion (123), and at least on one side of the bending area (11b), two oppositely arranged connecting portions (123) are joined.

2. The flexible circuit board (1) according to claim 1, characterized in that: The first film body (121) and the non-bending area (11a) are bonded to each other.

3. The flexible circuit board (1) according to claim 1, characterized in that: At least on one side of the bending area (11b), the two connecting portions (123) arranged opposite to each other are bonded to each other.

4. The flexible circuit board (1) according to claim 2 or 3, characterized in that: The first film body (121) and the non-bending area (11a) are bonded together by conductive adhesive, and / or, at least on one side of the bending area (11b), the two oppositely disposed connecting portions (123) are bonded together by conductive adhesive.

5. The flexible circuit board (1) according to claim 1, characterized in that: Each electromagnetic shielding film (12) has a plurality of connecting portions (123), and two of the connecting portions (123) in each electromagnetic shielding film (12) are respectively located on both sides of the flexible circuit board body (11) in the width direction.

6. The flexible circuit board (1) according to claim 1, characterized in that: The second film body (122) is in direct contact with the bending area (11b).

7. The flexible circuit board (1) according to claim 1, characterized in that: The width of the connecting portion (123) is 3 mm to 5 mm.

8. The flexible circuit board (1) according to claim 1, characterized in that: One side edge of the second film body (122) facing away from the first film body (121) is flush with one side edge of the flexible circuit board body (11) in the length direction.

9. The flexible circuit board (1) according to claim 1, characterized in that: The shape and size of the first film body (121) are respectively adapted to the shape and size of the non-bending area (11a).

10. The flexible circuit board (1) according to claim 1, characterized in that: The flexible circuit board (1) further comprises a board-to-board connector (13), wherein the board-to-board connector (13) is connected to at least one of the bending regions (11b).

11. An electronic device, characterized in that: The electronic device comprises the flexible circuit board (1) according to any one of claims 1 to 10.

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