Flexible circuit board capable of preventing bending and tearing

Abstract

The utility model discloses a flexible circuit board capable of preventing bending and tearing, which relates to the technical field of flexible circuit boards and comprises a circuit board main body, an inner corner is arranged at the bending position of the front side of the circuit board main body, and an outer corner is arranged at the bending position of the rear side of the circuit board main body. Copper wires are fixedly arranged at the positions, located on the bent edges of the inner corner and the outer corner, of the upper portion of the surface of the circuit board body, anti-tearing mechanisms are fixedly installed on the surfaces of the inner corner and the outer corner, and the anti-tearing mechanisms comprise soft strips fixedly installed on the surfaces of the inner corner and the outer corner. Compared with the existing common flexible circuit board, the bending and tearing prevention flexible circuit board has the advantages that the toughness strength of each bending part of the circuit board main body is greatly enhanced, the tearing prevention protection capability of the circuit board main body is improved, the tearing condition when the circuit board main body is bent is prevented, the whole circuit board main body can be prevented from being excessively bent and broken, and the service life of the circuit board main body is prolonged. And the use safety, stability and electrical performance of the circuit board main body are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible circuit boards, in particular to a flexible circuit board which is resistant to bending and tearing. Background Art

[0002] Flexible circuit boards are highly reliable flexible printed circuit boards made of polyimide or polyester film as the substrate. Flexible circuit boards have the characteristics of high wiring density, light weight and thin thickness. They are mainly used in mobile phones, laptops, digital cameras and other products.

[0003] For example, the public document with application number 202221484432.0 discloses an anti-tear structure for a flexible circuit board. The utility model uses two pieces of reinforcing cloth to surround the inner corners of the bending part of the circuit board body, and sets anti-tear copper wires at the inner corners of the bending part of the circuit board body, thereby improving the strength of the inner corners of the bending part of the circuit board body, effectively preventing the inner corners of the bending part of the circuit board body from being torn, and ensuring the electrical performance of the circuit board body. However, the flexible circuit board does not limit the maximum angle at the bending part. Although the strength of the overall bending part is improved, if the circuit board is excessively bent, it may still be torn or even broken.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a flexible circuit board that is resistant to bending and tearing is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a flexible circuit board that is resistant to bending and tearing, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a flexible circuit board that is resistant to bending and tearing, comprising a circuit board body, wherein the front bending part of the circuit board body is set as an inner corner, and the rear bending part of the circuit board body is set as an outer corner, copper wires are fixedly arranged at the bending edges of the inner corner and the outer corner above the surface of the circuit board body, and anti-tearing mechanisms are fixedly installed on the surfaces of the inner corner and the outer corner.

[0007] Preferably, the anti-tear mechanism comprises a soft strip fixedly mounted on both the inner corner surface and the outer corner surface, the surface of the soft strip is fixedly provided with protrusions, and the intervals between the protrusions are provided as grooves.

[0008] Preferably, the shape of the protrusion is set to be a triangle, and the shape of the groove is also set to be a triangle.

[0009] Preferably, gold fingers are provided on both left and right ends above the surface of the circuit board body, and the rear ends of the gold fingers are located on the surface of the circuit board body and connected to the circuit body.

[0010] Preferably, upper cover plates are fixedly mounted above both ends of the circuit board body, and a lower cover plate is fixedly disposed below the surface of the upper cover plate.

[0011] Preferably, the upper cover plate and the lower cover plate form a covering body to cover the gold fingers on the surface of the circuit board body, and through holes are provided at the front end of the surface of the upper cover plate corresponding to the positions of the gold fingers.

[0012] Preferably, the surface of the circuit board body is covered and fixedly provided with an insulating film, and the insulating film is provided with through cavities at the positions of the gold fingers and the anti-tearing mechanism.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model greatly improves the toughness strength of the bending part of the circuit board body through the arrangement of copper wire, anti-tearing mechanism, soft strip, protrusion and groove, effectively prevents the bending and tearing of the circuit board body, and can also limit the maximum bending angle of the circuit board body to prevent the circuit board body from being broken or torn due to excessive bending, thereby ensuring the safety and stability of the circuit board body and its own electrical performance;

[0015] 2. The utility model arranges an upper cover plate, a lower cover plate and an insulating film. The upper cover plate and the lower cover plate fix and cover the two ends of the circuit board body, thereby improving the fit of the end heads, preventing the two ends of the circuit board body from being exposed, and preventing the upper and lower layer ends of the board body from curling and warping. The gold fingers can also be protected. The insulating film covers the entire body of the circuit board body, further improving the strength of the edges of the body of the circuit board body, and avoiding delamination and cracking in the middle of the circuit board body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the anti-tear mechanism of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of removing the upper cover plate and the lower cover plate of the utility model;

[0019] Figure 4 This is a schematic diagram of the separation structure of the insulating film and the circuit board body of the utility model.

[0020] In the figure: 1. Circuit board body; 2. Inner corner; 3. Outer corner; 4. Copper wire; 5. Anti-tearing mechanism; 501. Soft strip; 502. Protrusion; 503. Groove; 6. Gold finger; 7. Circuit body; 8. Upper cover; 9. Lower cover; 10. Through hole; 11. Insulating film. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-Figure 4 As shown, a flexible circuit board that is resistant to bending and tearing includes a circuit board body 1, the front bending part of the circuit board body 1 is set as an inner corner 2, the rear bending part of the circuit board body 1 is set as an outer corner 3, copper wires 4 are fixedly arranged at the bending edges of the inner corner 2 and the outer corner 3 above the surface of the circuit board body 1, and anti-tearing mechanisms 5 are fixedly installed on the surfaces of the inner corner 2 and the outer corner 3.

[0023] By adopting the above technical solution, the inner corner 2 and the outer corner 3 are the bending points of the circuit board body 1, and the copper wire 4 is arranged at the two bending points to improve the toughness strength of the bending points and avoid bending and tearing. On the surface of the bending point, the anti-tear mechanism 5 set on the side of the circuit board body 1 can further improve the strength of the bending part and limit the maximum bending angle of the circuit board body 1 to prevent the circuit board body 1 from bending and breaking.

[0024] Furthermore, the anti-tear mechanism 5 includes a soft strip 501 fixedly installed on the surface of the inner corner 2 and the outer corner 3 , and protrusions 502 are fixedly provided on the surface of the soft strip 501 , and the intervals between the protrusions 502 are set as grooves 503 .

[0025] By adopting the above technical solution, the soft strip 501 is attached to the surfaces of the inner corner 2 and the outer corner 3, and the bending position is pulled. A part of the bending strain force is borne by the soft strip 501, which further improves the strength of the bending part; when the soft strip 501 is bent, the protrusions 502 will shrink using the grooves 503 and gather together. When the protrusions 502 are attached to each other, they cannot continue to bend and move, thereby limiting the maximum bending angle of the entire circuit board body 1.

[0026] Furthermore, the shape of the protrusion 502 is set to be a triangle, and the shape of the groove 503 is also set to be a triangle.

[0027] By adopting the above technical solution, the protrusions 502 and the grooves 503 are arranged in a triangular shape, so that when the soft strip 501 is bent in an arc, the protrusions 502 can be gathered and fitted to the maximum extent.

[0028] Furthermore, gold fingers 6 are provided on both left and right ends above the surface of the circuit board body 1 , and the rear ends of the gold fingers 6 are located on the surface of the circuit board body 1 and connected to the circuit body 7 .

[0029] By adopting the above technical solution, the gold finger 6 is connected to the external line and serves as a connection transmission node between the external line and the line body 7 .

[0030] Furthermore, upper cover plates 8 are fixedly installed above both ends of the circuit board body 1 , and a lower cover plate 9 is fixedly arranged below the surface of the upper cover plate 8 .

[0031] By adopting the above technical solution, the upper cover plate 8 and the lower cover plate 9 are fixedly covered on both ends of the circuit board body 1, so as to improve the fit of the end, prevent the two ends of the circuit board body 1 from being exposed, and prevent the upper and lower ends of the board from curling and warping, and protect the gold finger 6.

[0032] Furthermore, the upper cover plate 8 and the lower cover plate 9 form a covering body to cover the gold fingers 6 on the surface of the circuit board body 1 , and through holes 10 are opened at the front end of the surface of the upper cover plate 8 corresponding to the positions of the gold fingers 6 .

[0033] By adopting the above technical solution, the external circuit can be effectively connected to the gold finger 6 through the through hole 10 .

[0034] Furthermore, the surface of the circuit board body 1 is covered and fixedly provided with an insulating film 11 , and through cavities are reserved at the positions of the golden fingers 6 and the anti-tearing mechanism 5 of the insulating film 11 .

[0035] By adopting the above technical solution, the insulating film 11 is equivalent to a protective cover covering the circuit board body 1, covering the entire circuit board body 1, further improving the strength of the edges of the circuit board body 1, and avoiding delamination and cracking in the middle of the circuit board body 1.

[0036] Working principle: When using the anti-bending and tearing flexible circuit board, first, when the circuit board body 1 bends through the inner corner 2 and the outer corner 3, the pre-buried copper wire 4 improves the toughness strength of the bending parts of the two inflection points of the circuit board body 1 to prevent the bending parts of the circuit board body 1 from tearing. When the bending parts are bent, the soft strip 501 fits on the surfaces of the inner corner 2 and the outer corner 3 to pull the bending position. A part of the bending strain force is borne by the soft strip 501, which further improves the strength of the bending parts. At the same time, when the soft strip 501 of the inner corner 2 is bent, it will drive the protrusions 502 to gather together to reduce the space of the groove 503. When the protrusions 502 fit each other, they cannot continue to bend and move, which affects the entire circuit board body. 1 is limited to limit the maximum bending angle of the entire circuit board body 1, so that the strength of the entire circuit board body 1 is higher, and the bending angle is effectively determined, and the upper cover plate 8 and the lower cover plate 9 are fixedly covered on both ends of the circuit board body 1 to improve the fit of the end, prevent the two ends of the circuit board body 1 from being exposed, and the upper and lower layer endpoints of the board body from curling and warping, and can protect the gold finger 6. The insulating film 11 is used to cover the entire circuit board body 1, and the strength of the edge of the circuit board body 1 is further improved to avoid delamination and cracking in the middle of the circuit board body 1. The external circuit is inserted into the through hole 10 and connected to each gold finger 6 point, so that the circuit can be connected. This is the working principle of the anti-bending and tearing flexible circuit board.

Claims

1. A flexible circuit board that is resistant to bending and tearing, comprising a circuit board body (1), characterized in that: The front bending part of the circuit board body (1) is set as an inner corner (2), and the rear bending part of the circuit board body (1) is set as an outer corner (3). Copper wires (4) are fixedly arranged at the bending edges of the inner corner (2) and the outer corner (3) above the surface of the circuit board body (1), and anti-tearing mechanisms (5) are fixedly installed on the surfaces of the inner corner (2) and the outer corner (3).

2. The anti-bending and tearing flexible circuit board according to claim 1, characterized in that: The anti-tear mechanism (5) comprises a soft strip (501) fixedly mounted on the surfaces of the inner corner (2) and the outer corner (3), the surface of the soft strip (501) being fixedly provided with protrusions (502), and the intervals between the protrusions (502) being provided as grooves (503).

3. The anti-bending and tearing flexible circuit board according to claim 2, characterized in that: The shape of the protrusion (502) is set to be a triangle, and the shape of the groove (503) is also set to be a triangle.

4. The anti-bending and tearing flexible circuit board according to claim 1, characterized in that: Gold fingers (6) are provided on both left and right ends above the surface of the circuit board body (1); the rear ends of the gold fingers (6) are located on the surface of the circuit board body (1) and are connected to a circuit body (7).

5. The anti-bending and tearing flexible circuit board according to claim 1, characterized in that: An upper cover plate (8) is fixedly mounted above both ends of the circuit board body (1), and a lower cover plate (9) is fixedly arranged below the surface of the upper cover plate (8).

6. The anti-bending and tearing flexible circuit board according to claim 5, characterized in that: The upper cover plate (8) and the lower cover plate (9) form a covering body to cover the gold fingers (6) on the surface of the circuit board body (1); a through hole (10) is provided at the front end of the surface of the upper cover plate (8) corresponding to the position of each gold finger (6).

7. The anti-bending and tearing flexible circuit board according to claim 1, characterized in that: The surface of the circuit board body (1) is covered and fixedly provided with an insulating film (11), and through cavities are reserved at the positions of the gold finger (6) and the anti-tearing mechanism (5) of the insulating film (11).

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