WO2021134261A1

WO2021134261A1 - Flexible printed circuit board and electronic device

Info

Publication number: WO2021134261A1
Application number: PCT/CN2019/130038
Authority: WO
Inventors: 赵晋阳
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-08

Abstract

A flexible printed circuit board (10), and an electronic device employing the flexible printed circuit board (10). The flexible printed circuit board (10) comprises a printed circuit board main body (20) and a ground reinforcement plate (30). The printed circuit board main body (20) comprises a circuit portion (21) provided with circuits, and a connection portion (22, 23) connected to the circuit portion (21) and comprising a ground end region (220). The ground end region (220) is located at or extends to an edge of the connection portion (22, 23). The ground reinforcement plate (30) is disposed above and overlaps with the connection portion (22, 23), and at least a portion of the ground end region (220) is exposed by the ground reinforcement plate (30). The flexible printed circuit board (10) can avoid the occurrence of poor grounding such as ground resistance abnormality.

Description

Flexible circuit board and electronic device

Technical field

This application relates to the technical field of circuit boards, and in particular to a flexible circuit board and an electronic device using the flexible circuit board.

Background technique

In recent years, various electronic devices have generally appeared in various fields, and are updated at a development rate of several generations each year. As an important part of electronic devices, printed circuit boards are constantly being improved and updated. Flexible circuit board (FPC) is a component of various electronic products, and its grounding combination is mostly to attach the ground terminal of the bottom layer of the flexible circuit board and the ground steel sheet with hot or cold pressure conductive adhesive to achieve it. The flexible circuit board itself realizes the upper and lower layers of conduction through the through holes, and the flexible circuit board components are connected to the top layer of the flexible circuit board through the solder paste, and then the conduction between the flexible circuit board and the grounding steel sheet is realized. through. Since the contact resistance of the conductive adhesive changes greatly, the resistance of the grounding resistance after attachment is difficult to control, and the gas between the grounding terminal and the grounding steel sheet is not easy to discharge during the pressing or attachment of the grounding steel sheet, which also causes the grounding resistance value It is necessary to improve the abnormal grounding phenomenon such as abnormality.

technical problem

The purpose of the present application is to provide a flexible circuit board that can avoid some poor grounding phenomena such as abnormal grounding resistance and an electronic device using the flexible circuit board.

Technical solutions

The technical solution of the present application is as follows: a flexible circuit board, which includes a circuit board main body and a grounding reinforcement sheet, the circuit board main body includes a circuit part with a circuit and a connection part connecting the circuit part, the connection part It includes a ground terminal region, the ground terminal region is located at or extends to the edge of the connecting portion, the ground reinforcing sheet is stacked on the connecting portion, and at least part of the ground terminal region exposes the ground reinforcing sheet.

As an improvement, the ground reinforcement sheet is laminated and arranged on the connection part through conductive adhesive bonding.

As an improvement, the ground reinforcement sheet is a steel sheet.

As an improvement, the connecting portion further includes other areas connected to the grounding terminal area, the grounding terminal area includes a first portion and a second portion connected to the first portion and located at the edge of the connecting portion, the grounding complement The strong sheet is overlapped and arranged in the other area and the first part, and the second part is exposed outside the ground reinforcing sheet.

As an improvement, the second part includes a first arc-shaped side located at the edge of the connecting portion, and the first arc-shaped side protrudes in a direction away from the first part.

As an improvement, the grounding reinforcement sheet includes an opening corresponding to the second part and exposing the second part outside the grounding reinforcement sheet.

As an improvement, the opening is a semi-closed gap at the edge of the grounding reinforcement sheet.

As an improvement, the grounding reinforcement sheet includes a second arc-shaped side surrounding the gap, and the second arc-shaped side protrudes toward the direction where the first part is located.

As an improvement, the ground reinforcing sheet includes other contour edges connected to both ends of the second arc-shaped side, and the other contour edges of the ground reinforcing sheet and the contour edges of the connecting portion and the connecting portion The position connected with the line part is superimposed.

An electronic device includes a flexible circuit board, and the flexible circuit board adopts any one of the above-mentioned technical solutions and a flexible circuit board with improved technical solutions.

Beneficial effect

The beneficial effects of this application are:

Compared with the related art, in the flexible circuit board and the electronic device of the present application, the ground terminal area of the circuit board main body is located at or extends to the edge of the connecting portion, and at least part of the ground terminal area exposes the ground supplement The strong piece, during the pressing or attaching process of the grounding reinforcing piece, the gas between the grounding end area and the grounding reinforcing piece is easily discharged, avoiding the occurrence of some bad grounding phenomena such as abnormal grounding resistance, so that The flexible circuit board of the present application has high reliability.

Further, as an improvement, when the grounding reinforcing sheet is bonded to the connecting portion by conductive glue, air bubbles are likely to be generated during the bonding process by the conductive glue, and the grounding terminal area is located at the grounding portion. The edge makes the bubble gas easier to discharge.

Further, as an improvement, the ground reinforcement sheet is a steel sheet, which is relatively common, which makes the flexible circuit board easy to implement and has strong practicability.

Further, as an improvement, the connecting portion further includes other areas connected to the ground terminal area, and the ground terminal area includes a first portion and a second portion connected to the first portion and located at the edge of the connecting portion. The grounding reinforcement sheet is superimposed on the other area and the first part, and the second part is exposed outside the grounding reinforcement sheet, so that the bubble gas located at the edge of the grounding part can be more easily discharged.

Further, as an improvement, the second part includes a first arc-shaped side located at the edge of the connecting portion, and the first arc-shaped side protrudes in a direction away from the first part. The second part of the shape facilitates the picking and placement of the flexible circuit board and the attachment of the ground reinforcement sheet.

Further, as an improvement, the grounding reinforcement sheet includes an opening corresponding to the second part and allowing the second part to be exposed outside the grounding reinforcement sheet. In addition, the opening may be a semi-closed gap located at the edge of the ground reinforcement sheet. The arrangement of the opening, especially the notch at the edge, is more conducive to the discharge of bubble gas.

Further, as an improvement, the grounding reinforcement sheet includes a second arc-shaped side surrounding the gap, and the second arc-shaped side protrudes toward the direction where the first part is located. The second arc-shaped side of the shape facilitates the pick-up and placement of the flexible circuit board and the attachment of the ground reinforcement sheet.

Further, as an improvement, the ground reinforcing sheet includes other contour edges connected to both ends of the second arc-shaped side, and the other contour edges of the ground reinforcing sheet are connected to the contour edges of the connecting portion and all The connecting position of the connecting part and the line part are overlapped, and this design can achieve a better reinforcement effect.

Description of the drawings

FIG. 1 is a schematic structural diagram of a flexible circuit board provided by an embodiment of the present application.

Description of main component symbols: flexible circuit board 10; circuit board main body 20; ground reinforcement sheet 30; circuit part 21; connection parts 22, 23; ground terminal area 220; other areas 223; first part 221; second part 222; The first arc-shaped side 222a; the opening 31a; the second arc-shaped side 31; the other contour sides 32; the contour side 222b; the connection position 222c. Embodiments of the present invention

The application will be further described below in conjunction with the drawings and implementations.

It should be noted that the terms "first", "second", and "third" in the specification and claims of the application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific sequence. In addition, the term "including" and any variations of them are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.

All the directional indications (such as up, down, left, right, front, back, inside, outside, top, bottom...) in the embodiments of this application are only used to explain in a certain posture (as shown in the figure) The relative positional relationship between the components, etc., if the specific posture changes, the directional indication will also change accordingly. When an element is referred to as being "fixed on" or "disposed on" another element, the element may be directly on the other element or a centering element may also be present at the same time. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a flexible circuit board 10 provided by an embodiment of the present application. The flexible circuit board 10 includes a circuit board main body 20 and a ground reinforcement sheet 30. The circuit board main body 20 includes a circuit portion 21 having circuits and connecting portions 22 and 23 connected to the circuit portion 21. The connecting portion 22 and the connecting portion 23 are respectively connected to two ends of the circuit portion 21, and can be respectively electrically connected with external circuits and other components, so as to electrically connect two different external circuit components.

The connecting portion 22 includes a ground terminal region 220 and other regions 223 connected to the ground terminal region, and the ground terminal region 220 is located or extends to the edge of the connecting portion 22. Specifically, the ground terminal area 220 includes a first portion 221 and a second portion 222 connected to the first portion 221 and located at the edge of the connecting portion 22. The second portion 222 includes a first arc-shaped side 222 a located at the edge of the connecting portion 22, and the first arc-shaped side 222 a protrudes away from the first portion 22.

The ground reinforcing sheet 30 is overlapped and arranged on the connecting portion 22 and at least part of the ground terminal region 220 is exposed to the ground reinforcing sheet 30. In this embodiment, the ground reinforcing sheet 30 is a steel sheet, and the ground reinforcing sheet 30 is laminated and arranged on the connecting portion 22 through conductive adhesive bonding. The ground reinforcement sheet 30 is superimposed on the other area 223 and the first portion 221, and the second portion 222 is exposed outside the ground reinforcement sheet 30. The ground reinforcement sheet 30 includes an opening 31 a corresponding to the second portion 222 and allows the second portion 222 to be exposed outside the ground reinforcement sheet 30. Specifically, the opening 31a is a semi-closed gap located at the edge of the ground reinforcement sheet 30. The ground reinforcement piece 30 includes a second arc-shaped side 31 surrounding the gap, and the second arc-shaped side 31 protrudes toward the direction where the first portion 221 is located.

Further, the ground reinforcing sheet 30 includes other contour edges 32 connected to both ends of the second arc-shaped side 31, and the other contour edges 32 of the ground reinforcing sheet 30 and the contour edges 222b of the connecting portion 22 And the connecting position 222c between the connecting portion 22 and the line portion 21 overlaps.

The beneficial effects of this application are:

Compared with the related art, in the flexible circuit board 10 of the present application, the ground terminal area 220 of the circuit board body 20 is located or extends to the edge of the connecting portion 22, and at least part of the ground terminal area 220 is exposed. For the grounding reinforcement sheet 30, during the pressing or attaching process of the grounding reinforcement sheet 30, the gas between the grounding terminal area 220 and the grounding reinforcement sheet 30 is easily exhausted, so as to avoid some abnormal ground resistance values, etc. The occurrence of poor grounding makes the flexible circuit board 10 of the present application highly reliable.

Further, as an improvement, when the ground reinforcing sheet 30 is bonded to the connecting portion 22 by conductive adhesive, air bubbles are likely to be generated during the bonding process by the conductive adhesive, and the ground terminal region 220 is located at the The edge of the grounding portion 22 makes it easier to discharge the bubble gas.

Further, as an improvement, the ground reinforcement sheet 30 is a steel sheet, which is relatively common, which makes the flexible circuit board 20 easy to implement and has strong practicability.

Further, as an improvement, the connecting portion 22 further includes other regions 223 connected to the ground terminal region 220. The ground terminal region 220 includes a first portion 221 and connected to the first portion 221 and located at the connecting portion 22. The second part 222 of the edge, the grounding reinforcement sheet 30 is superimposed on the other area 223 and the first part 221, and the second part 222 is exposed outside the grounding reinforcement sheet 30 so as to be located The bubbling gas at the edge of the grounding portion 22 is more easily discharged.

Further, as an improvement, the second portion 222 includes a first arc-shaped side 222a located at the edge of the connecting portion 22, and the first arc-shaped side 222a protrudes in a direction away from the first portion 221 . The second part 222 of the shape facilitates the picking and placement of the flexible circuit board 10 and the attachment of the ground reinforcement sheet.

Further, as an improvement, the ground reinforcement sheet 30 includes an opening 31 a corresponding to the second portion 222 and allows the second portion 222 to be exposed outside the ground reinforcement sheet 30. In addition, the opening 31a may be a semi-closed notch located at the edge of the ground reinforcement sheet 30. The arrangement of the opening 31a, especially the notch at the edge, is more conducive to the discharge of bubble gas.

Further, as an improvement, the grounding reinforcement sheet 30 includes a second arc-shaped side 31 surrounding the gap, and the second arc-shaped side 31 protrudes toward the direction where the first portion 221 is located. The second arc-shaped side 31 of the shape facilitates the pick-up and placement of the flexible circuit board 10 and the attachment of the ground reinforcement sheet.

Further, as an improvement, the ground reinforcement sheet 30 includes other contour edges connected to both ends of the second arc-shaped side 31, and the other contour edges 32 of the ground reinforcement sheet 30 and the connecting portion 22 The contour edge 222b of φ and the position where the connecting portion 22 and the line portion 21 are connected are roughly overlapped. This design can achieve a better reinforcement effect.

The present application also provides an electronic device, which includes a flexible circuit board, the flexible circuit board adopts the flexible circuit board 10 described in the above-mentioned embodiment, and is used to electrically connect two circuit elements in the electronic device. connection. The electronic device may include, but is not limited to, a mobile phone, a monitor, a desktop computer, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), Wearable Device, etc.

The above are only the implementation manners of this application. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of this application, but these all belong to this application. The scope of protection.

Claims

1. A flexible circuit board, characterized in that the flexible circuit board includes a circuit board main body and a grounding reinforcing sheet, the circuit board main body includes a circuit part with a circuit and a connection part connecting the circuit part, The connecting portion includes a grounding terminal area, the grounding terminal area is located or extending to the edge of the connecting portion, the grounding reinforcing sheet is stacked on the connecting portion, and at least part of the grounding terminal area is exposed. The grounding reinforcement sheet.

2. The flexible circuit board according to claim 1, wherein the ground reinforcement sheet is laminated and arranged on the connection part by conductive adhesive bonding.

3. The flexible circuit board according to claim 1, wherein the ground reinforcement sheet is a steel sheet.

4. The flexible circuit board according to claim 1, wherein the connecting portion further comprises other areas connected to the ground terminal area, and the ground terminal area includes a first part and a first part connected to the first part and located at the For the second part of the edge of the connecting portion, the grounding reinforcement sheet is superimposed on the other area and the first part, and the second part is exposed outside the grounding reinforcement sheet.

5. The flexible circuit board according to claim 4, wherein the second part comprises a first arc-shaped side at the edge of the connecting portion, and the first arc-shaped side faces away from the first part The direction bulges.

6. The flexible circuit board according to claim 1, wherein the ground reinforcement sheet comprises an opening, and the opening corresponds to the second part and allows the second part to be exposed to the ground reinforcement. Off-chip.

7. The flexible circuit board according to claim 6, wherein the opening is a semi-closed notch located at the edge of the ground reinforcement sheet.

8. The flexible circuit board according to claim 7, wherein the ground reinforcement sheet comprises a second arc-shaped side surrounding the gap, and the second arc-shaped side faces the first part The direction is protruding.

9. The flexible circuit board according to claim 8, wherein the ground reinforcement sheet comprises other contour edges connected to both ends of the second arc-shaped side, and other contour edges of the ground reinforcement sheet It is overlapped with the contour edge of the connecting portion and the position where the connecting portion is connected with the line portion.

10. An electronic device comprising a flexible circuit board, characterized in that the flexible circuit board adopts the flexible circuit board according to any one of claims 1-9.