CN110012594A

CN110012594A - A kind of flexible circuit board and terminal device

Info

Publication number: CN110012594A
Application number: CN201910318401.4A
Authority: CN
Inventors: 黄强元; 李奎; 陈嫚
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2019-07-12

Abstract

The present invention provides a kind of flexible circuit board FPC and terminal device.The FPC includes: first connecting portion and second connecting portion；More routes of split settings, the first end of every route are electrically connected with first connecting portion, and the second end of every route is electrically connected with second connecting portion；Wherein, at least partly part of path in the score section of every route is in free state so that each route can relative motion, the score section of any route is the part of path between its first end and second end.As it can be seen that in the embodiment of the present invention, by changing the structure of FPC, the behaviour area of FPC to be made into the form of more individual routes, is able to ascend the torsion capacity of FPC, reduces a possibility that FPC is broken, to extend the service life of FPC.

Description

Flexible circuit board and terminal equipment

Technical Field

The invention relates to the technical field of electronic products, in particular to a Flexible Printed Circuit (FPC) and a terminal device.

Background

In the field of electronic product technology, the application range of FPC is very wide, and basically, FPC is required to be used in all electronic devices. The FPC is mainly characterized by flexibility, can be folded into various shapes according to structural requirements, can be applied to a movable portion such as a portion requiring sliding, expansion and contraction, bending, and the like, and has a relatively long life.

Although the FPC has many excellent properties as described above, the conventional FPC is easily broken when a twisting motion occurs, which may have a very adverse effect on the service life of the FPC.

Disclosure of Invention

The embodiment of the invention provides an FPC (flexible printed circuit) and terminal equipment, and aims to solve the problem that in the prior art, when twisting motion occurs, the FPC is easy to break, so that the service life of the FPC is adversely affected.

In order to solve the technical problem, the invention is realized as follows:

in one aspect, an embodiment of the present invention provides a flexible printed circuit FPC, including:

a first connection portion and a second connection portion;

the first end of each circuit is electrically connected with the first connecting part, and the second end of each circuit is electrically connected with the second connecting part;

wherein at least some of the target line sections of each of the lines are free to enable relative movement of the lines, the target line section of any one of the lines being a line section between its first and second ends.

On the other hand, an embodiment of the present invention provides a terminal device, including the flexible circuit board described above.

In the FPC provided in the embodiment of the present invention, the plurality of lines may be separately disposed, the first end of each line is electrically connected to the first connecting portion, the second end of each line is electrically connected to the second connecting portion, and at least a part of the target line section of each line may be in a free state, so that each line can perform a relative motion. That is, the first connecting portion and the second connecting portion may be connected by a plurality of separate lines, which are not completely fixed to each other, so that when the FPC is twisted, resistance applied to the FPC may be reduced, the twisting of the FPC may be more easily performed, and the possibility of the FPC being broken may be greatly reduced. Therefore, in the embodiment of the invention, the structure of the FPC is changed, the active area of the FPC is made into a form of a plurality of independent circuits, the twisting capacity of the FPC can be improved, the possibility of breakage of the FPC is reduced, and the service life of the FPC is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic view of an FPC according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a conventional FPC;

FIG. 3 is a schematic view showing a front-rear sliding mode of a conventional FPC;

FIG. 4 is a schematic view of a bending pattern of a conventional FPC;

FIG. 5 is a schematic view showing a twisted state of a conventional FPC;

FIG. 6 is a schematic diagram of a circuit structure of an FPC according to an embodiment of the present invention;

FIG. 7 is a second schematic diagram illustrating a structure of a circuit in an FPC according to an embodiment of the present invention;

FIG. 8 is a second schematic view of the FPC structure provided by the embodiment of the present invention;

FIG. 9 is a third schematic view of the FPC structure provided by the embodiment of the present invention;

FIG. 10 is a fourth schematic view of the FPC structure provided by the embodiment of the present invention;

fig. 11 is a fifth schematic structural view of an FPC according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following first explains the FPC provided by the embodiment of the present invention.

It should be noted that the FPC provided in the embodiment of the present invention may be applied to a terminal device. Specifically, the terminal device may be: computers (Computer), Mobile phones, Tablet Personal computers (Tablet Personal Computer), Laptop computers (Laptop Computer), Personal Digital Assistants (PDA), Mobile Internet Devices (MID), Wearable devices (Wearable Device), and the like.

Of course, the FPC provided in the embodiments of the present invention may also be applied to other types of electronic devices besides the terminal device, and for facilitating understanding of the present solution by those skilled in the art, the embodiments of the present invention are all described by taking the case of being applied to the terminal device as an example.

Referring to fig. 1, a schematic diagram of a structure of an FPC provided by an embodiment of the present invention is shown. As shown in fig. 1, the FPC includes: a first connection part 11, a second connection part 13, and a plurality of lines 15 which are separately arranged; a first end (upper end shown in fig. 1) of each wire 15 is electrically connected to the first connection portion 11, and a second end (lower end shown in fig. 1) of each wire 15 is electrically connected to the second connection portion 13; wherein at least some of the target line segments of each line 15 are free to allow relative movement of the lines 15, the target line segment of any line 15 being the line segment between its first and second ends.

Here, the first connection portion 11 and the second connection portion 13 may be regarded as a rest area in the FPC, and the first connection portion 11 and the second connection portion 13 may be used to connect with other components in the terminal device. Specifically, the first connection portion 11 and the second connection portion 13 may be electrically connected to other components by means of plugging, welding, pressing, and the like.

In addition, the plurality of lines 15 may be considered as an active area in the FPC, and "a plurality" of the plurality of lines 15 means at least two, so that the FPC may include two, three, four, five, six, or more than six lines 15; each line 15 is strip-shaped, and each line 15 has electrical properties.

Note that, for each line 15, the remaining portion thereof, except for the first end electrically connected to the first connection portion 11 and the second end connected to the second connection portion 13, belongs to the target line segment. At least a portion of each target line segment may be exposed, and in this case, each line 15 included in the FPC can be seen by a user from the appearance of the FPC, and the lines 15 can move relative to each other.

Generally, as shown in fig. 2, the conventional FPC includes a plurality of wires 15 ', the plurality of wires 15' are all fixedly disposed in one sheet structure 10 ', the plurality of wires 15' are not visible to a user from the appearance of the conventional FPC, and the plurality of wires 15 'in the sheet structure 10' are all fixed relative to each other and cannot move relative to each other.

The existing FPC can perform sliding and bending motions. Specifically, the existing FPC may be slid in the direction indicated by arrow 301 or arrow 302 in fig. 3, and at this time, the existing FPC is in the front-back sliding mode; the existing FPC may be bent in a direction shown by an arrow 401 or an arrow 402 in fig. 4, and at this time, the existing FPC is in a bending mode. However, when the conventional FPC is twisted in the direction indicated by arrow 501 or arrow 502 in fig. 5, the positions indicated by arrows 601, 602, 603, and 604 in fig. 5 are easily torn or broken, which may adversely affect the service life of the conventional FPC.

In view of this, in the FPC provided in the embodiment of the present invention, the plurality of lines 15 may be separately disposed, the first end of each line 15 is electrically connected to the first connecting portion 11, the second end of each line 15 is electrically connected to the second connecting portion 13, and at least a part of the target line segment of each line 15 may be in a free state, so that the lines 15 can perform a relative movement. That is, the first connecting portion 11 and the second connecting portion 13 can be connected by a plurality of individual wires 15, and the wires 15 are not completely fixed relative to each other, so that when the FPC is twisted, the resistance of the FPC can be reduced, the twisting of the FPC can be more easily realized, and the possibility of the FPC being broken can be greatly reduced. Therefore, in the embodiment of the invention, the structure of the FPC is changed, and the active area of the FPC is made into a plurality of independent circuits 15, so that the twisting capacity of the FPC can be improved, the possibility of breakage of the FPC is reduced, and the service life of the FPC is prolonged. Thus, the FPC in the embodiment of the present invention can be applied to a rotary camera in a terminal device.

Optionally, the FPC includes lines 15 of different lengths therein.

In this embodiment, when the FPC does not generate a twisting motion, the plurality of lines 15 may be symmetrically disposed. For example, as shown in fig. 1, the FPC may include five wires 15, wherein one wire 15 is located at the center, and the other four wires 15 are symmetrically distributed on two sides of the wire 15 located at the center. Thus, of the five lines 15, the two lines 15 located at the outermost side are symmetrical and have the same length (assuming that the length is L1), the two lines 15 located immediately adjacent to the line 15 located at the center are symmetrical and have the same length (assuming that the length is L2), and L1 may be larger than L2, and L2 may be larger than L3(L3 is the length of the line 15 located at the center).

Of course, it is also possible that the plurality of lines 15 in the FPC are arranged asymmetrically.

In this embodiment, since the lengths of the plurality of wires 15 in the FPC are not completely the same, the active region of the FPC is not completely tightened but has some margin, which is advantageous to the twisting motion of the FPC, so that the possibility of the FPC breaking can be further reduced.

Optionally, as shown in fig. 1, the FPC further includes: a binder 17, the binder 17 binding the target line section of each line 15.

In this embodiment, the binding member 17 can be used as a binding material for the plurality of lines 15, and can shape the active region of the FPC to prevent the plurality of lines 15 from being scattered too much, and in addition, the binding member 17 can protect the lines 15 by binding the plurality of lines 15, so as to reduce the wear of the lines 15 as much as possible, thereby prolonging the service life of the lines 15.

Alternatively, as shown in fig. 6 and 7, each line 15 includes: a line body 151, a first insulating protection film 153, and a first substrate insulating layer 155; the first insulating film 153 and the first substrate insulating layer 155 enclose an insulating space, and the circuit body 151 is located in the insulating space.

In fig. 6, the wiring 15 has a single-layer structure, i.e., the active region of the FPC has a single-layer structure; in fig. 7, the wiring 15 has a double-layer structure, i.e., the active region of the FPC has a double-layer structure. Of course, the active region of the FPC may also be of at least three-layer structure.

It should be noted that the line body 151 is used to realize the electrical performance of the line 15. In this embodiment, the circuit body 151 is located in the insulation space formed by the first insulation protection film 153 and the first substrate insulation layer 155, so as to protect the circuit body 151, thereby preventing the circuit body 151 from being chemically corroded and physically worn, and ensuring the normal operation of the circuit 15. In a specific implementation, the line 15 may be obtained by processing the substrate by etching, punching, laser cutting, or the like, and then covering the first insulating protective film 153.

Alternatively, as shown in fig. 8, the first connection portion 11 includes: the first conductor layer 111 and the second connection portion 13 include: a second conductor layer 131; a first end of each of the lines 15 in fig. 1 is electrically connected to the first conductor layer 111, and a second end of each of the lines 15 in fig. 1 is electrically connected to the second conductor layer 131.

In this embodiment, due to the arrangement of the first conductor layer 111 and the second conductor layer 131, the first conductor layer 111 and the second conductor layer 131 are connected and conducted with other components in the terminal device, so that the connection and conduction between the FPC and other components can be very conveniently realized.

Alternatively, as shown in fig. 9 to 11, the first connection portion 11 further includes: the first connector 113, the first connector 113 is electrically connected to the first conductor layer 111.

In fig. 9, both the static area and the active area of the FPC are of a single layer structure; in fig. 10, the static area of the FPC is a double-layer structure, and the active area of the FPC is a single-layer structure; in fig. 11, both the static area and the active area of the FPC are of a double-layer structure. Of course, the rest area of the FPC may also be at least three-layer structure.

It is noted that the structure of the second connection portion 13 may be similar to that of the first connection portion 11. Then, as shown in fig. 9 to 11, the second connection portion 13 further includes: the second connector 133, the second connector 133 and the second conductor layer 131 may be electrically connected.

In this embodiment, due to the arrangement of the first connector 113 and the second connector 133, the first connector 113 and the second connector 133 are connected and conducted with other components in the terminal device, so that the connection and conduction between the FPC and other components can be very conveniently realized.

Alternatively, as shown in fig. 9, the first connection portion 11 includes: a first conductive layer 111; the FPC further includes: a second substrate insulating layer 19 and a first reinforcing member 21; the first stiffener 21 is disposed on the first conductive layer 111 through the second substrate insulating layer 19.

Specifically, the upper surface of the second substrate insulating layer 19 may be bonded to the first conductor layer 111, and the lower surface of the second substrate insulating layer 19 may be bonded to the first stiffener 21. Here, the first reinforcement member 21 may be a reinforcement sheet made of a material such as a stainless steel sheet or Polyimide (PI).

In addition, similar to the structure of the first connection part 13, as shown in fig. 9, the second connection part 13 may include: a second conductor layer 131, the FPC further comprising: a third substrate insulating layer 23 and a second reinforcement 25; the second stiffener 25 is disposed on the second conductive layer 131 through the third substrate insulating layer 23.

In this embodiment, the setting of base plate insulating layer can play better insulating effect, and the setting of reinforcement can structurally play support and reinforcement effect to promote the intensity of first connecting portion 11 and second connecting portion 13.

Alternatively, as shown in fig. 10 and 11, the first connection portion 11 includes at least two first conductor layers 111 arranged in a stacked manner, a fourth substrate insulating layer 115 having a first via hole is interposed between two adjacent first conductor layers 111, and the two adjacent first conductor layers 111 are electrically connected through the corresponding first via holes.

Similar to the first connection portion 10, as shown in fig. 10 and 11, the second connection portion 13 may include at least two second conductor layers 131 stacked one on another, a fifth substrate insulation layer 135 having a second via hole is interposed between two adjacent second conductor layers 131, and the two adjacent second conductor layers 131 are electrically connected through the corresponding second via holes.

In this embodiment, when the static area of the FPC has at least two layers, the first via hole can connect and conduct each layer in the static area, thereby ensuring normal operation of the FPC.

Optionally, as shown in fig. 10 and 11, the FPC further includes: a second insulating protective film 27 and a third stiffener 29; the third stiffener 29 is disposed on the first conductor layer 111 located on the outermost layer through the second insulating protective film 27.

Specifically, the upper surface of the second insulation protection film 27 may be the first conductor layer 111 located at the outermost layer, and the lower surface of the second insulation protection film 27 may be bonded to the third stiffener 29. Here, the third reinforcement 29 may be a reinforcement made of a stainless steel sheet or PI or the like.

Similarly, as shown in fig. 10 and 11, the FPC may further include: a third insulating protective film 31 and a fourth stiffener 33; the fourth stiffener 33 is disposed on the second conductor layer 131 located at the outermost layer through the third insulating protective film 31.

In this embodiment, the setting of insulating protection film can play better insulating effect, and the setting of reinforcement piece can structurally play support and reinforcement effect to promote the intensity of first connecting portion 11 and second connecting portion 13.

In summary, in the embodiment, the structure of the FPC is changed, and the active area of the FPC is made into a plurality of individual lines 15, so that the twisting capability of the FPC can be improved, the possibility of breakage of the FPC can be reduced, and the service life of the FPC can be prolonged.

The following describes a terminal device provided in an embodiment of the present invention.

The embodiment of the invention also provides terminal equipment, and the terminal equipment comprises the FPC. The specific implementation process of the FPC may refer to the above description, and this is not limited in the embodiment of the present invention.

Since the FPC has the above technical effects, the terminal device including the FPC also has corresponding technical effects, which are not described herein again.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A flexible circuit board FPC, comprising:

a first connection portion and a second connection portion;

2. The FPC of claim 1, wherein the wires are of different lengths.

3. The FPC of claim 2, further comprising:

a strapping member that straps the target line section of each of the lines.

4. The FPC of claim 1, wherein each of the wires comprises:

the circuit comprises a circuit body, a first insulating protective film and a first substrate insulating layer;

the first insulating protective film and the first substrate insulating layer are arranged in a surrounding mode to form an insulating space, and the circuit body is located in the insulating space.

5. The FPC of claim 1, wherein the first connection portion comprises: a first conductor layer, the second connection portion including: a second conductor layer; wherein,

a first end of each of the lines is electrically connected to the first conductor layer, and a second end of each of the lines is electrically connected to the second conductor layer.

6. The FPC of claim 5, wherein the first connection portion further comprises:

a first connector electrically connected to the first conductor layer.

7. The FPC of claim 5, wherein the first connection portion comprises: a first conductive layer; the FPC further includes:

a second substrate insulating layer and a first reinforcing member;

the first reinforcing part is arranged on the first conductor layer through the second substrate insulating layer.

8. The FPC as claimed in claim 5, wherein the first connection portion includes at least two first conductor layers stacked together, a fourth substrate insulating layer having a first via hole is interposed between two adjacent first conductor layers, and the two adjacent first conductor layers are electrically connected through the corresponding first via holes.

9. The FPC of claim 8, further comprising:

a second insulating protective film and a third reinforcing member;

the third reinforcement member is disposed on the first conductor layer located on the outermost layer through the second insulating protective film.

10. A terminal device characterized by comprising the flexible circuit board according to any one of claims 1 to 9.