CN215222584U - Flexible circuit board and electronic product with high life-span of bending - Google Patents
Flexible circuit board and electronic product with high life-span of bending Download PDFInfo
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- CN215222584U CN215222584U CN202120872819.2U CN202120872819U CN215222584U CN 215222584 U CN215222584 U CN 215222584U CN 202120872819 U CN202120872819 U CN 202120872819U CN 215222584 U CN215222584 U CN 215222584U
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Abstract
The utility model discloses a flexible circuit board and electronic product with high bending life, which comprises a flexible circuit board body, wherein the flexible circuit board body comprises a static area and a dynamic bending area which are connected along the horizontal direction, the transition area of the static area and the dynamic bending area adopts a step design, the upper and lower sides of the transition area of the static area and the dynamic bending area are symmetrically provided with a reinforcing structure, the reinforcing structure comprises a conductive adhesive layer and a reinforcing sheet, the conductive adhesive layer is covered on the transition area of the static area and the dynamic bending area, and the reinforcing sheet is covered on the conductive adhesive layer, the utility model adopts the step design at the transition part of the dynamic bending area and the static area of the flexible circuit board, the steps are filled by the conductive adhesive layer at the outer side of the flexible circuit board, and the reinforcing sheet is used for press protection at the outer side of the conductive adhesive layer to protect the position of the rotating layer, the dynamic bending is prevented from breaking, and the bending times are increased from about 22 ten thousand to 26 ten thousand.
Description
Technical Field
The utility model belongs to the technical field of the flexible line, especially, relate to a flexible line way board and electronic product with high life-span of bending.
Background
Flexible wiring boards, also known as "FPC flexible boards", are printed circuits made of flexible insulating base materials and have many advantages not possessed by rigid printed wiring boards. For example, the device can be freely bent, wound and folded, can be randomly arranged according to the space layout requirement, and can be randomly moved and stretched in a three-dimensional space, so that the integration of component assembly and wire connection is realized. The FPC flexible board can greatly reduce the volume of electronic products, and is suitable for the development of the electronic products in the directions of high density, miniaturization and high reliability. Therefore, the FPC flexible board is widely applied to the fields or products of aerospace, military, mobile communication, portable computers, computer peripherals, PADs, digital cameras and the like;
at present, the market demand of mobile phone folding screens is increasing day by day, the technical difficulty of high-performance bending-resistant flexible circuits which are suitable for the folding standards of the industry is increased, and the requirement on the bending-resistant times of flexible circuit boards is particularly increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a flexible line way board and electronic product with high life-span of bending can effectively prevent to bend the switching point fracture and promote the number of times of bending.
In order to solve the above problem, the technical scheme of the utility model is that:
a flexible circuit board with long bending service life comprises a flexible circuit board body;
the flexible circuit board body comprises a static area and a dynamic bending area which are connected along the horizontal direction, the static area and the transition area of the dynamic bending area are designed in a step mode, the static area is formed by sequentially stacking a first outer covering film, a top copper foil, a first dielectric layer, a first inner covering film, a second dielectric layer, an inner copper foil, a second inner covering film, a third dielectric layer, a bottom copper foil and a second outer covering film in the vertical direction, the transition region of the static region and the dynamic bending region is formed by stacking the first dielectric layer, the first inner layer covering film, the second dielectric layer, the inner layer copper foil, the second inner layer covering film and the third dielectric layer in sequence along the vertical direction, the dynamic bending area is formed by stacking the second dielectric layer, the inner copper foil and the second inner covering film in sequence along the vertical direction;
the static region and the dynamic bending region are symmetrically provided with reinforcing structures at the upper side and the lower side of the transition region, each reinforcing structure comprises a conductive adhesive layer and a reinforcing sheet, the conductive adhesive layers are covered on the static region and the dynamic bending region, the conductive adhesive layers in the static region and the conductive adhesive layers in the dynamic bending region are flush, and the reinforcing sheets are covered on the conductive adhesive layers.
Preferably, the first dielectric layer, the second dielectric layer and the third dielectric layer are made of polyimide.
Preferably, the reinforcing sheet is a steel sheet.
Preferably, the step width of the transition region between the static region and the dynamic bending region is 0.5-0.7 mm.
Based on the same inventive concept, the utility model also provides an electronic product, including the above-mentioned flexible line way board that has high bending life-span
The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:
1) the utility model provides a flexible circuit board with high bending service life, which comprises a flexible circuit board body, wherein the flexible circuit board body comprises a static area and a dynamic bending area which are connected along the horizontal direction, the transition area of the static area and the dynamic bending area adopts a step design, the static area and the upper and lower sides of the transition area of the static area and the dynamic bending area are symmetrically provided with a reinforcing structure, the reinforcing structure comprises a conductive adhesive layer and a reinforcing sheet, the conductive adhesive layer is covered on the static area and the transition area of the static area and the dynamic bending area, and the conductive adhesive layer of the static area and the conductive adhesive layer of the transition area of the static area and the dynamic bending area are flush, the reinforcing sheet is covered on the conductive adhesive layer, the utility model adopts the step design at the transition part of the dynamic bending area and the static area of the flexible circuit board, and the steps are filled by the conductive adhesive layer at the outer side, and the outer side of the conductive adhesive layer is subjected to press-fit protection by adopting a reinforcing sheet so as to protect the position of the rotating layer and prevent dynamic bending from being broken at the position, and the bending frequency is improved from about 22 to 26 ten thousand.
Drawings
Fig. 1 is a schematic structural diagram of a flexible printed circuit board with a long bending life according to an embodiment of the present invention.
Description of reference numerals:
1, a flexible circuit board body; 11: a static area; 12: a dynamic bending region; 2: a reinforcing structure; 21: a conductive adhesive layer; 22: a reinforcing sheet.
Detailed Description
The following provides a flexible printed circuit with a long bending life and an electronic product, which are described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.
Example one
Referring to fig. 1, the present embodiment provides a flexible printed circuit with a long bending life, including a flexible printed circuit body 1;
the flexible circuit board body 1 comprises a static area 11 and a dynamic bending area 12 which are connected along the horizontal direction, the transition area of the static area 11 and the dynamic bending area 12 adopts a step design, the static area 11 is formed by stacking a first outer layer covering film, a top layer copper foil, a first dielectric layer, a first inner layer covering film, a second dielectric layer, an inner layer copper foil, a second inner layer covering film, a third dielectric layer, a bottom layer copper foil and a second outer layer covering film along the vertical direction, the transition area of the static area 11 and the dynamic bending area 12 is formed by stacking the first dielectric layer, the first inner layer covering film, the second dielectric layer, the inner layer copper foil, the second inner layer covering film and the third dielectric layer along the vertical direction, and the dynamic bending area 12 is formed by stacking the second dielectric layer, the inner layer and the second inner layer covering film along the vertical direction The second medium layer and the third medium layer are made of polyimide, the first outer layer covering film, the first inner layer covering film, the second inner layer covering film and the second outer layer covering film are made of polyimide with high-frequency characteristics, and the thicknesses of the layers are respectively as follows: the thickness of first outer cover film is 27.5um, the thickness of top layer copper foil is 12um, the thickness of first dielectric layer is 12.5um, the thickness of first inner cover film is 27.5um, the thickness of second dielectric layer is 12.5um, the thickness of inner layer copper foil is 12um, the thickness of second inner cover film is 27.5um, the thickness of third dielectric layer is 12.5um, the thickness of bottom layer copper foil is 12um and the thickness of second outer cover film is 27.5um
The static region 11, the static region 11 and the transition region of the dynamic bending region 12 are symmetrically provided with a reinforcing structure 2 at the upper and lower sides, the reinforcing structure 2 comprises a conductive adhesive layer 21 and a reinforcing sheet 22, the conductive adhesive layer 21 covers the static region 11 and the transition region of the static region 11 and the dynamic bending region 12, and the layer of conductive glue 21 on the static area 11 and the static area 11 are flush with the layer of conductive glue 21 on the transition area of the dynamic bending area 12, namely, the thickness of the conductive adhesive layer 21 on the transition region between the static region 11 and the dynamic bending region 12 is equal to the thickness of the conductive adhesive layer 21 on the static region 11 plus the thickness of the first outer layer covering film plus the thickness of the top layer copper foil, the reinforcing sheet 22 is covered on the conductive adhesive layer 21, in the present embodiment, the reinforcing plate 22 is a steel plate, the thickness of the conductive adhesive layer 21 outside the static region 11 is 60um, and the thickness of the conductive adhesive layer 21 at the transition region between the static region 11 and the dynamic bending region 12 is 99.5 um.
As a preferable example of the present embodiment, the step width of the transition region between the static region 11 and the dynamic bending region 12 is 0.5 to 0.7mm, preferably 0.6 mm.
The embodiment provides a flexible printed circuit board with a long bending life, which comprises a flexible printed circuit board body 1, wherein the flexible printed circuit board body 1 comprises a static region 11 and a dynamic bending region 12 which are connected in the horizontal direction, the transition regions of the static region 11 and the dynamic bending region 12 adopt a step design, the upper side and the lower side of the transition regions of the static region 11, the static region 11 and the dynamic bending region 12 are symmetrically provided with a reinforcing structure 2, the reinforcing structure 2 comprises a conductive adhesive layer 21 and a reinforcing sheet 22, the conductive adhesive layer 21 is covered on the transition regions of the static region 11, the static region 11 and the dynamic bending region 12, the conductive adhesive layer 21 on the static region 11 and the conductive adhesive layer 21 on the transition region of the static region 11 and the dynamic bending region 12 are flush, the reinforcing sheet 22 is covered on the conductive adhesive layer 21, the embodiment adopts the step design at the transition position of the dynamic bending region and the static region of the flexible printed circuit board, the steps are filled up by adopting the conductive adhesive layer on the outer side of the conductive adhesive layer, and the reinforcing sheet 22 is adopted on the outer side of the conductive adhesive layer for pressing protection so as to protect the position of the rotating layer and prevent the dynamic bending from being broken at the position, and the bending frequency is improved from about 22 ten thousand times to 26 ten thousand times.
Example two
Based on the same inventive concept, the embodiment also provides an electronic product, which includes the flexible circuit board with a long bending life.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Claims (5)
1. A flexible circuit board with long bending service life is characterized by comprising a flexible circuit board body;
the flexible circuit board body comprises a static area and a dynamic bending area which are connected along the horizontal direction, the static area and the transition area of the dynamic bending area are designed in a step mode, the static area is formed by sequentially stacking a first outer covering film, a top copper foil, a first dielectric layer, a first inner covering film, a second dielectric layer, an inner copper foil, a second inner covering film, a third dielectric layer, a bottom copper foil and a second outer covering film in the vertical direction, the transition region of the static region and the dynamic bending region is formed by stacking the first dielectric layer, the first inner layer covering film, the second dielectric layer, the inner layer copper foil, the second inner layer covering film and the third dielectric layer in sequence along the vertical direction, the dynamic bending area is formed by stacking the second dielectric layer, the inner copper foil and the second inner covering film in sequence along the vertical direction;
the static region and the dynamic bending region are symmetrically provided with reinforcing structures at the upper side and the lower side of the transition region, each reinforcing structure comprises a conductive adhesive layer and a reinforcing sheet, the conductive adhesive layers are covered on the static region and the dynamic bending region, the conductive adhesive layers on the static region and the dynamic bending region are flush with each other, and the reinforcing sheets are covered on the conductive adhesive layers.
2. The flexible printed circuit board with a long bending life as claimed in claim 1, wherein the first dielectric layer, the second dielectric layer and the third dielectric layer are made of polyimide.
3. The flexible wiring board with high bending life according to claim 1, wherein the reinforcing sheet is a steel sheet.
4. The flexible circuit board with high bending life according to claim 1, wherein the step width of the transition region between the static region and the dynamic bending region is 0.5-0.7 mm.
5. An electronic product comprising the flexible wiring board having a high bending life according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120872819.2U CN215222584U (en) | 2021-04-26 | 2021-04-26 | Flexible circuit board and electronic product with high life-span of bending |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120872819.2U CN215222584U (en) | 2021-04-26 | 2021-04-26 | Flexible circuit board and electronic product with high life-span of bending |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215222584U true CN215222584U (en) | 2021-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120872819.2U Active CN215222584U (en) | 2021-04-26 | 2021-04-26 | Flexible circuit board and electronic product with high life-span of bending |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215222584U (en) |
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2021
- 2021-04-26 CN CN202120872819.2U patent/CN215222584U/en active Active
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