CN110049616B - Flexible circuit board - Google Patents
Flexible circuit board Download PDFInfo
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- CN110049616B CN110049616B CN201910283417.6A CN201910283417A CN110049616B CN 110049616 B CN110049616 B CN 110049616B CN 201910283417 A CN201910283417 A CN 201910283417A CN 110049616 B CN110049616 B CN 110049616B
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- side edge
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- circuit board
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/028—Bending or folding regions of flexible printed circuits
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Abstract
The invention relates to the technical field of mobile terminals, and discloses a flexible circuit board which comprises a flexible circuit board body, wherein the flexible circuit board body comprises a first extending part and a second extending part, the first extending part is provided with a first inner side edge and a first outer side edge, the second extending part is provided with a second inner side edge and a second outer side edge, the first inner side edge and the second inner side edge are jointed to form an inner side joint part, the first outer side edge and the second outer side edge are jointed to form an outer side joint part, and an anti-tearing gap is formed at the inner side joint part; a first notch with an opening direction facing the second inner side edge is formed on the first inner side edge, and the bottom edge of the first notch is connected with the side edge of the tearing-proof gap; and/or the second inner side edge is provided with a second notch with the opening direction facing the first inner side edge, and the bottom edge of the second notch is connected with the other side edge of the tearing-proof gap. Above-mentioned flexible circuit board is through the structural design who changes the flexible circuit board body, does benefit to the flexibility ratio when the increase flexible circuit board body is buckled.
Description
Technical Field
The invention relates to the technical field of mobile terminals, in particular to a flexible circuit board.
Background
A Flexible Printed Circuit (FPC) is a Flexible Printed Circuit board with high reliability, which is made of polyimide or polyester film as a base material, and has the characteristics of high wiring density, light weight, thin thickness, good bending property, and the like. Specifically, since the volume of the FPC is smaller than that of a Printed Circuit Board (PCB for short), the volume of the mobile phone can be effectively reduced, and the convenience in carrying is increased; the weight of the FPC is lighter than that of the PCB, so that the weight of the mobile phone can be reduced; and the thickness of FPC is thinner than PCB board, can improve compliance, strengthen doing the equipment of three-dimensional space in the limited space of cell-phone inside. Therefore, in the process of mobile phone development, the connection between the main board and the small board and the connection between other functional components and the circuit board are conducted through the flexible circuit board.
In addition to the straight flexible circuit board, a bent flexible circuit board with a certain angle, especially a flexible circuit board with a vertical angle, is also commonly used in the mobile phone products, as shown in fig. 1. Fig. 1 is a conventional flexible circuit board, in which two ends of the flexible circuit board are connected to a main board or a small board or a functional component, respectively. The sign 1 is shown as an arc transition of the flexible circuit board in the vertical direction and the horizontal direction, and the arc transition is made at the connection position to prevent the flexible circuit board from being pulled during installation or maintenance operation to cause cracks along the sign 1 and tear the whole flexible circuit, so the flexible circuit is also commonly called as a tear-proof gap. Practice proves that if the sign 1 is designed to be in a right angle, stress concentration is easily generated at the flexible circuit board when the flexible circuit board is stressed and stretched, cracks are generated, and the flexible circuit board is torn.
Although the design of the arc transition at the position of the mark 1 in fig. 1 can reduce the possibility of tearing the flexible circuit board to some extent, when the flexible circuit board with the shape is bent, the mobility of the flexible circuit board is not high. For example, the point 3 and the point 4 are fixed, the point 2 is bent toward the point 3, the bent portion can only be bent to the arc of the mark 1, and if the point 2 is continuously bent toward the point 3, the mark 1 is pulled and torn. Similarly, point 3 and point 2 are fixed, point 4 bends toward point 3, and the degree of motion is not high, and the bending area is limited.
Therefore, it is urgently needed to provide a flexible circuit board with higher mobility.
Disclosure of Invention
The invention provides a flexible circuit board, which is beneficial to increasing the flexibility of the flexible circuit board body during bending by changing the structural design of the flexible circuit board body.
In order to achieve the purpose, the invention provides the following technical scheme:
a flexible circuit board comprises a flexible circuit board body, wherein the flexible circuit board body comprises a first extension part and a second extension part, the extension direction of the second extension part is perpendicular to the first extension part, the first extension part is provided with a first inner side edge and a first outer side edge which are arranged in parallel, the second extension part is provided with a second inner side edge and a second outer side edge which are arranged in parallel, the first inner side edge and the second inner side edge are jointed to form an inner side joint part, the first outer side edge and the second outer side edge are jointed to form an outer side joint part, and the inner side joint part is provided with a tearing-proof gap, the opening direction of which faces away from the outer side joint part direction;
a first notch with the opening direction facing to the second inner side edge is formed in the first inner side edge, and the bottom edge of the first notch is connected with the side edge of the tearing-proof gap; and/or the presence of a gas in the gas,
the second inner side edge is provided with a second notch with the opening direction facing the first inner side edge, and the bottom edge of the second notch is connected with the other side edge of the tearing-proof gap.
In the above-mentioned flexible circuit board, the flexible circuit board includes first extension and second extension, wherein, the extending direction of first extension is perpendicular with the extending direction of second extension, and first extension has first inboard side and first outside limit, the second extension has the inboard side of second and the outside limit of second, the inboard handing-over portion of first inboard side and the inboard side of second formation, the outside handing-over portion of first outside limit and the outside limit of second formation, and inboard handing-over portion is formed with the tear-proof gap, the inboard side of first inboard side and/or second is formed with the breach. When the flexible circuit board provided by the invention is bent, taking bending the first extending part and forming the second notch on the second inner side edge as an example: when the end, far away from the second extension part, of the first extension part is bent towards the direction close to the second extension part, the opening direction of the tearing-proof opening faces the direction away from the outer side cross-connecting part, the bending-driven part can extend to the tearing-proof opening to the maximum extent, and the tearing-proof opening increases the flexibility of the flexible circuit board body to a certain extent; and because the second notch towards the first inner side edge is formed on the second inner side edge of the second extending portion, and the bottom edge of the second notch is connected with the side edge of the tearing-proof opening, an auxiliary tearing opening is formed in an area surrounded by the second notch, the second inner side edge and the inner space of the flexible circuit board, when the flexible circuit board is bent and extended to the tearing-proof opening, the second extending portion can be further folded and folded without being torn, and the structure further increases the mobility of the flexible circuit board body. It should be noted that, when the first extending portion has the first notch and the second extending portion is bent, the auxiliary tearing opening on the first extending portion can also increase the mobility of the flexible circuit board.
The flexible circuit board provided by the invention utilizes the anti-tearing holes and the auxiliary tearing holes to increase the mobility of the whole flexible circuit board body and reduce the possibility that the flexible circuit board body is torn.
Therefore, the flexible circuit board is beneficial to increasing the flexibility of the flexible circuit board body when the flexible circuit board body is bent by changing the structural design of the flexible circuit board body.
Preferably, the first inner side edge is formed with a first notch, and the second inner side edge is formed with a second notch.
Preferably, the bottom edge of the first notch and the side edge of the tear-proof gap are in smooth transition; and/or the presence of a gas in the gas,
the bottom edge of the second notch and the side edge of the tearing-proof gap are in smooth transition.
Preferably, the bottom edge of the first notch is parallel to the first inner side edge; and/or the presence of a gas in the gas,
the bottom edge of the second notch is parallel to the second inner side edge.
Preferably, the distance between the bottom edge of the first notch and the first inner side edge is greater than 0mm and less than or equal to 1 mm; and/or the presence of a gas in the gas,
the distance between the bottom edge of the second notch and the inner side edge of the second notch is larger than 0mm and smaller than or equal to 1 mm.
Preferably, the bottom edge of the first notch is connected with the first inner side edge through a first connecting edge, the first connecting edge is in smooth transition with the first inner side edge, and the first connecting edge is in smooth transition with the bottom edge of the first notch; and/or the presence of a gas in the gas,
the bottom edge of the second notch is connected with the inner side edge of the second through a second connecting edge, the second connecting edge is in smooth transition with the inner side edge of the second, and the second connecting edge is in smooth transition with the bottom edge of the second notch.
Preferably, the tear preventing slit has a U-shaped structure.
Preferably, the U-shaped structure extends along the inner junction in a direction towards the outer junction.
Drawings
Fig. 1 is a schematic structural diagram of a flexible circuit board provided in the prior art;
fig. 2 is a schematic structural diagram of a flexible circuit board according to an embodiment of the present invention;
fig. 3 is an enlarged partial view of the tear preventing opening of fig. 2.
Icon: 01-a first extension; 02-a second extension; 03-tear resistance; 04-first notch; 05-a second gap; 011-first inner side edge; 012-a first outer side; 013 — bottom edge of first gap; 014-first connecting edge; 021-a second inner side edge; 022-a second outer side; 023-the bottom edge of the second notch; 024-a second connecting edge; 031-a first side; 032-second side edge; 033-U shaped bottom edge; 034-third connecting edge; 035-fourth connecting edge.
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 2 and 3, the present invention provides a flexible circuit board, including a flexible circuit board body, the flexible circuit board body includes a first extension portion 01 and a second extension portion 02 extending in a direction perpendicular to the first extension portion 01, the first extension portion 01 has a first inner side 011 and a first outer side 012 arranged in parallel, the second extension portion 02 has a second inner side 021 and a second outer side 022 arranged in parallel, and the first inner side 011 and the second inner side 021 are joined to form an inner side joint portion, the first outer side 012 and the second outer side 022 are joined to form an outer side joint portion, and the inner side joint portion is formed with a tear-proof gap 03 having an opening direction facing a direction away from the outer side joint portion;
the first inner side edge 011 is formed with a first notch 04 having an opening direction facing the second inner side edge 021, and a bottom edge 013 of the first notch is connected to a side edge of the tear-proof slit 03; and/or the presence of a gas in the gas,
the second inner side edge 021 is formed with a second notch 05 having an opening direction facing the first inner side edge 011, and a bottom edge 023 of the second notch is connected to the other side edge of the tear preventing slit 03.
In the above-mentioned flexible circuit board, the flexible circuit board includes first extension 01 and second extension 02, wherein, the extending direction of first extension 01 is perpendicular with the extending direction of second extension 02, and first extension 01 has first inboard edge 011 and first outside limit 012, second extension 02 has second inboard edge 021 and second outside edge 022, first inboard edge 011 and second inboard edge 021 form inboard handing-over portion, first outside edge 012 and second outside edge 022 form the outside handing-over portion, and inboard handing-over portion is formed with tear-proof hole 03, first inboard edge 011 and/or second inboard edge 021 are formed with the breach. When the flexible circuit board provided by the invention is bent, taking the first extending portion 01 as an example, and the second inner side edge 021 is provided with the second notch 05, when the end of the first extending portion 01 far away from the second extending portion 02 is bent towards the direction close to the second extending portion 02, because the opening direction of the tear-proof crack 03 faces the direction far away from the outer side intersection portion, the bending-driven portion can extend to the tear-proof crack 03 to the maximum extent, and the tear-proof crack 03 increases the flexibility of the flexible circuit board body to a certain extent; and, because the second inboard edge 021 of second extension 02 is formed with the second breach 05 towards first inboard edge 011, and the base 023 of second breach is connected with the side of tear-proof breach 03, the region that second breach 05 and second inboard edge 021 and flexible circuit board inner space enclose forms supplementary tear-proof breach, when the bending type extends to tear-proof breach 03 department, second extension 02 can also further turn over and not torn, the activity of flexible circuit board body has further been increased to this structure. When the first extending portion 01 has the first notch 04 and the second extending portion 02 is bent, the auxiliary tearing opening on the first extending portion 01 can also increase the mobility of the flexible circuit board.
According to the flexible circuit board provided by the invention, the tearing-proof opening 03 and the auxiliary tearing opening are utilized to increase the activity of the whole flexible circuit board body and reduce the possibility that the flexible circuit board body is torn.
Therefore, the flexible circuit board is beneficial to increasing the flexibility of the flexible circuit board body when the flexible circuit board body is bent by changing the structural design of the flexible circuit board body.
It should be noted that, in the flexible circuit board provided by the present invention, the flexible circuit board body may only be provided with the first notch 04, or only be provided with the second notch 05, or both be provided with the first notch 04 and the second notch 05.
It is noted that it is preferable to set: the first inner side edge 011 is formed with a first notch 04, and the second inner side edge 021 is formed with a second notch 05.
It should be noted that, when the flexible circuit board body is provided with both the first notch 04 and the second notch 05, the mobility of the flexible circuit board body in the extending direction of the first extending portion 01 and in the extending direction of the second extending portion 02 can be increased, so that the flexibility of bending the flexible circuit board body as a whole is increased.
In addition, it is to be noted that the following technical solutions are described based on the flexible circuit board body being provided with both the first notch 04 and the second notch 05 (of course, when the flexible circuit board body is provided with only the first notch 04 or the second notch 05, the corresponding structure in the following technical solutions may be provided, and will not be described herein again):
in order to avoid tearing caused by stress concentration in local areas when the flexible circuit board body is bent or folded, as a preferred embodiment, one of the following technical solutions may be provided:
the first scheme is as follows: the bottom edge 013 of the first notch and the side edge of the tear-preventing notch 03 are smoothly transited.
Scheme II: the bottom edge 023 of the second notch is smoothly transited with the side edge of the tearing-proof gap 03.
The third scheme is as follows: the bottom edge 013 of the first notch and the side edge of the tear-preventing notch 03 are smoothly transited, and the bottom edge 023 of the second notch and the side edge of the tear-preventing notch 03 are smoothly transited.
In addition to the above technical means, in order to better exhibit the function of assisting the tear, it is preferable to provide: the bottom edge 013 of the first notch is parallel to the first inner side edge 011; and/or the presence of a gas in the gas,
the bottom edge 023 of the second notch is parallel to the second inner side edge 021.
On the basis of the technical scheme, the method preferably comprises the following steps: the distance between the bottom edge 013 of the first notch and the first inner side edge 011 is greater than 0mm and less than or equal to 1 mm; and/or the presence of a gas in the gas,
the distance between the bottom edge 023 of the second notch and the second inner side edge 021 is more than 0mm and less than or equal to 1 mm.
It should be noted that, when the distance between the bottom edge of the notch and the inner side edge is too large, the structural strength of the flexible circuit board body is affected, and the circuit design on the flexible circuit board is affected, so that the distance between the bottom edge of the notch and the inner side edge is preferably greater than 0mm and less than or equal to 1 mm.
On the basis of the above technical solution, similarly, in order to avoid tearing caused by stress concentration in a local region when bending or folding the flexible circuit board body, it is preferable to provide:
the bottom edge 013 of the first notch is connected with the first inner side edge 011 through a first connecting edge 014, the first connecting edge 014 and the first inner side edge 011 are in smooth transition, and the first connecting edge 014 and the bottom edge 013 of the first notch are in smooth transition; and/or the presence of a gas in the gas,
the bottom edge 023 of the second notch is connected with the second inner side edge 021 through a second connecting edge 024, the second connecting edge 024 is in smooth transition with the second inner side edge 021, and the second connecting edge 024 is in smooth transition with the bottom edge 023 of the second notch.
On the basis of the technical scheme, the tear-preventing slit 03 is of a U-shaped structure.
Please refer to fig. 3, the U-shaped structure includes a first side 031, a second side 032, and a U-shaped bottom 033 located between the first side 031 and the second side 032.
With continued reference to fig. 3, specifically, the following are set: the U-shaped structure extends along the direction of the inner side interface part pointing to the outer side interface part.
A specific embodiment is now provided: (the first extension 01 is a horizontal extension, the second extension 02 is a longitudinal extension, and the first extension 01 has a first gap 04, the second extension 02 has a second gap 05, the tear-proof thread 03 is a U-shaped structure, the bottom edge 013 of the first gap is parallel to the first inner edge 011, the bottom edge 023 of the second gap is parallel to the second inner edge 021, and the connecting points of the two edges are smoothly connected, the first side edge 031 of the tear-proof thread 03 is smoothly connected to the bottom edge 013 of the first gap by a third connecting edge 034, the second side edge 032 of the tear-proof thread 03 is smoothly connected to the bottom edge 023 of the second gap by a fourth connecting edge 035.)
Specifically, with continuing reference to fig. 2 and 3, when the point 101 and the point 102 are pressed and fixed, the point 103 is bent toward the point 102, and in general, the bent portion extends to the fourth connecting edge 035, but because the anti-tearing slit 03 is designed, the mobility is increased, the bent portion can extend to the U-shaped bottom edge 033 of the anti-tearing slit 03 to the maximum extent, and meanwhile, the first inner side 011, the first connecting edge 014, the bottom edge 013 of the first notch, and the inner region of the flexible circuit board body form a transverse auxiliary anti-tearing slit, and the transverse anti-tearing slit 03 increases the mobility of the transverse extending portion (the portion between the point 101 and the point 102 in fig. 3), so that when the bent portion extends to the U-shaped bottom edge 033 of the anti-tearing slit 03, the transverse extending portion can be further folded, and the overall mobility is increased. When the flexible circuit board body is further folded, the folding can be carried out without being torn because the transverse extending part of the flexible circuit board body is provided with the transverse auxiliary tearing-proof gap. Meanwhile, arc transition is carried out at corners of each straight line section and in narrow spaces, so that tearing caused by stress concentration of local areas during bending or folding is avoided.
Similarly, when the point 103 and the point 102 are pressed and fixed, the point 101 is bent towards the point 102, and at the maximum, due to the design of the tearing-proof opening 03, the activity is increased, the bending-driven part can extend to the U-shaped bottom edge 033 of the tearing-proof opening 03 to the maximum extent, and meanwhile, a longitudinal auxiliary tearing-proof opening is formed in the first inner side 011, the first connecting edge 014, the bottom edge 013 of the first notch and the inner region of the flexible circuit board body, and the activity of the longitudinal extension part (the part between the point 103 and the point 102 in fig. 3) is increased by the longitudinal auxiliary tearing-proof opening, so when the bending extends to the U-shaped bottom edge 033 of the tearing-proof opening 03, the longitudinal extension part can be further folded, and further the overall activity is increased.
In addition, when only the point 103 is fixed, because of the auxiliary tear-preventing slits (transverse and longitudinal) and the tear-preventing slits 03, and at the same time, there is a circular arc transition at the corners of each straight line segment and at the narrow space, and there is no stress concentration, the first extending portion 01 and the second extending portion 02 can be turned over at the same time, and the whole flexible circuit board body cannot be torn.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A flexible circuit board is characterized by comprising a flexible circuit board body, wherein the flexible circuit board body comprises a first extension part and a second extension part, the extension direction of the second extension part is perpendicular to that of the first extension part, the first extension part is provided with a first inner side edge and a first outer side edge which are arranged in parallel, the second extension part is provided with a second inner side edge and a second outer side edge which are arranged in parallel, the first inner side edge and the second inner side edge are jointed to form an inner side joint part, the first outer side edge and the second outer side edge are jointed to form an outer side joint part, and the inner side joint part is provided with a tearing-proof gap, the opening direction of which faces away from the outer side joint part direction;
a first notch with the opening direction facing to the second inner side edge is formed in the first inner side edge, and the bottom edge of the first notch is connected with the side edge of the tearing-proof gap; and/or the presence of a gas in the gas,
the second inner side edge is provided with a second notch with the opening direction facing the first inner side edge, and the bottom edge of the second notch is connected with the other side edge of the tearing-proof gap.
2. The flexible circuit board of claim 1, wherein the first inner side edge is formed with a first notch and the second inner side edge is formed with a second notch.
3. The flexible circuit board of claim 2, wherein a bottom edge of the first notch is rounded off from a side edge of the tear-proof opening; and/or the presence of a gas in the gas,
the bottom edge of the second notch and the side edge of the tearing-proof gap are in smooth transition.
4. The flexible circuit board of claim 2, wherein a bottom edge of the first notch is parallel to the first inner side edge; and/or the presence of a gas in the gas,
the bottom edge of the second notch is parallel to the second inner side edge.
5. The flexible circuit board of claim 4, wherein the distance between the bottom edge of the first notch and the first inner side edge is greater than 0mm and less than or equal to 1 mm; and/or the presence of a gas in the gas,
the distance between the bottom edge of the second notch and the inner side edge of the second notch is larger than 0mm and smaller than or equal to 1 mm.
6. The flexible circuit board of claim 5, wherein the bottom edge of the first notch is connected to the first inner side edge by a first connecting edge, the first connecting edge is in smooth transition with the first inner side edge, and the first connecting edge is in smooth transition with the bottom edge of the first notch; and/or the presence of a gas in the gas,
the bottom edge of the second notch is connected with the inner side edge of the second through a second connecting edge, the second connecting edge is in smooth transition with the inner side edge of the second, and the second connecting edge is in smooth transition with the bottom edge of the second notch.
7. The flexible circuit board of any one of claims 1-6, wherein the tear preventing slits are U-shaped.
8. The flexible circuit board of claim 7, wherein the U-shaped structure extends along the inner interface in a direction toward the outer interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910283417.6A CN110049616B (en) | 2019-04-10 | 2019-04-10 | Flexible circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910283417.6A CN110049616B (en) | 2019-04-10 | 2019-04-10 | Flexible circuit board |
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| CN110049616A CN110049616A (en) | 2019-07-23 |
| CN110049616B true CN110049616B (en) | 2021-08-17 |
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| CN201910283417.6A Active CN110049616B (en) | 2019-04-10 | 2019-04-10 | Flexible circuit board |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113825297A (en) * | 2020-06-19 | 2021-12-21 | 京东方科技集团股份有限公司 | Display panel, display device and terminal equipment |
| CN112162594B (en) * | 2020-09-08 | 2023-03-10 | 华为技术有限公司 | Electronic device |
| CN115623673A (en) * | 2021-07-12 | 2023-01-17 | 华为技术有限公司 | Circuit board module and electronic equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100733877B1 (en) * | 2000-07-06 | 2007-07-02 | 엘지.필립스 엘시디 주식회사 | Flexable Printed Circuit Film |
| TW200710672A (en) * | 2005-09-02 | 2007-03-16 | Adv Flexible Circuits Co Ltd | Circuit connection bus cable capable of changing corresponding pins |
| JP5347375B2 (en) * | 2008-08-22 | 2013-11-20 | 日本電気株式会社 | Flexible board and wiring cable holding structure |
| CN202679795U (en) * | 2012-07-17 | 2013-01-16 | 东莞市五株电子科技有限公司 | Flexible printed circuit board and electronic component adopting same |
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