Flexible circuit board capable of being curled and folded

Abstract

A flexible circuit board capable of being curled and folded comprises a first circuit board, a second circuit board and a fiber yarn layer arranged between the first circuit board and the second circuit board. Each of the first circuit board and the second circuit board comprises an effective area and a board edge area, and the board edge areas are arranged on the two sides of the effective area; the outer side edge of the plate edge area extends inwards to be provided with a guide groove. Hollowed-out holes are formed in the fiber yarn layer. According to the utility model, the fiber layer and the guide groove are combined, so that the thicker flexible circuit board is not easy to damage when being bent and folded. The guide grooves are staggered up and down and left and right, so that the overall flexibility of the circuit board can be improved, and the circuit board is high in practicability and has relatively high popularization significance.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit boards, in particular to a flexible circuit board that can be rolled and folded. Background Art

[0002] Flexible circuit boards, also known as "soft boards," are printed circuits made from a flexible insulating substrate. They offer excellent electrical performance, meeting the design requirements for smaller and higher-density installations. They also help reduce assembly steps and enhance reliability. Currently, FPCs are primarily used in traditional end products such as mobile phones, tablets, and laptops, and the market is maturing. Flexible circuit boards may need to be bent and folded during use; however, existing flexible circuit boards can only bend moderately, limiting their applicable scenarios. If multiple locations are bent, twisted, or folded significantly, the thicker the flexible circuit board, the more susceptible it is to damage, potentially even tearing or breaking. Utility Model Content

[0003] Based on this, it is necessary to provide a rollable and foldable flexible circuit board to address the deficiencies in the prior art.

[0004] A rollable and foldable flexible circuit board comprises a first circuit board, a second circuit board, and a fiber layer disposed between the first and second circuit boards; the first and second circuit boards each comprise an effective area and a board edge area, the board edge areas being disposed on either side of the effective area; guide grooves are provided along the outer edges of the board edge areas extending inward; and hollow holes are provided on the fiber layer.

[0005] Furthermore, the guide groove is arranged to extend horizontally, and the guide grooves on the same side of the first circuit board and the second circuit board are arranged to be staggered up and down.

[0006] Furthermore, the guide grooves on both sides of the first circuit board or the second circuit board are also staggered.

[0007] Furthermore, a plurality of heat dissipation holes are provided on the first circuit board and the second circuit board, and the heat dissipation holes are provided corresponding to the guide grooves.

[0008] Furthermore, the heat dissipation holes are arranged to extend obliquely, and their extending direction is consistent with the extending direction of the guide groove.

[0009] Furthermore, the hollow holes are arranged in a diamond shape, and the relative transverse angles thereof are parallel to the transverse line of the circuit board, and the other two relative angles are parallel to the vertical line of the circuit board.

[0010] Furthermore, the guide groove is arranged in an arc shape, and the ammonium vacancies on the fiber layer are arranged in an octagonal shape.

[0011] Furthermore, the multiple octagons are evenly arranged, and the four groups of diagonal corners of the octagons and the corresponding corners of the adjacent hollow holes are on the same horizontal, vertical or inclined straight line.

[0012] In summary, the rollable and foldable flexible circuit board of this utility model, through the combination of a fiber layer and guide grooves, makes thicker flexible circuit boards less susceptible to damage during bending and folding. The guide grooves are staggered vertically and horizontally, thereby enhancing the overall flexibility of the circuit board, rather than limiting the flexibility of a specific area. This utility model is highly practical and has significant potential for widespread adoption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a rollable and foldable flexible circuit board according to the present invention;

[0014] Figure 2 for Figure 1 A schematic cross-sectional view of the circuit board;

[0015] Figure 3 for Figure 2 A schematic structural diagram of the middle fiber layer 30;

[0016] Figure 4 This is a schematic structural diagram of a second embodiment of a rollable and foldable flexible circuit board according to the present invention;

[0017] Figure 5 for Figure 4 Schematic diagram of the structure of the fiber layer 30. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] like Figures 1 to 3 As shown, the present invention provides a rollable and foldable flexible circuit board, which includes a first circuit board 10, a second circuit board 20 and a fiber layer 30 arranged between the first circuit board 10 and the second circuit board 20.

[0020] The first circuit board 10 and the second circuit board 20 both include an effective area and a board edge area, and the board edge areas are arranged on both sides of the effective area. A guide groove 11 is provided on the outer edge of the board edge area, extending inward, and the guide groove 11 is arranged to extend horizontally. Moreover, the guide grooves 11 on the same side of the first circuit board 10 and the second circuit board 20 are staggered up and down, that is, they are not aligned up and down; and the guide grooves 11 on the same first circuit board 10 or second circuit board 20 are also staggered. Furthermore, the guide groove 11 on the left side of the first circuit board 10 is aligned with the guide groove 11 on the left side of the second circuit board 20 in the lateral extension direction, and the guide groove 11 on the right side of the first circuit board 10 is aligned with the guide groove 11 on the left side of the second circuit board 20 in the lateral extension direction. The design of this staggered structure makes the multi-layer circuit board uniform and soft as a whole.

[0021] In addition, the first and second circuit boards 10 and 20 are provided with a plurality of heat dissipation holes 12, corresponding to the guide slots 11. Furthermore, the heat dissipation holes 12 are arranged at an angle, and their extension direction aligns with the extension direction of the guide slots 11, thereby further improving the bending flexibility of the central portion of the circuit board. In this embodiment, the fiber layer 30 is provided with hollow holes 31. These hollow holes 31 are arranged in a diamond shape, with two of their transversely opposing corners parallel to the transverse lines of the circuit board, and the other two opposing corners of the hollow holes 31 parallel to the vertical lines of the circuit board, thereby enhancing flexibility during both transverse and vertical bending.

[0022] like Figures 4 and 5 As shown, this is the second embodiment of the present invention. The structure of this embodiment is basically the same as the first embodiment, except that: in this embodiment, the guide groove 11 is arranged in an arc shape, and the ammonium hollow holes 31a on the fiber layer 30a are arranged in an octagonal shape. Multiple octagons are evenly arranged, and the four groups of diagonal corners of the octagon and the corresponding corners of adjacent hollow holes 31a are on the same horizontal, vertical, or oblique line. The arc-shaped groove serves as a guide for bending, and the arc-shaped and octagonal structures enable the circuit board to be bent horizontally, vertically, or along an oblique line (or folded).

[0023] In summary, the rollable and foldable flexible circuit board of this utility model, through the combination of a fiber layer and guide grooves, makes thicker flexible circuit boards less susceptible to damage during bending and folding. The guide grooves are staggered vertically and horizontally, thereby enhancing the overall flexibility of the circuit board, rather than limiting the flexibility of a specific area. This utility model is highly practical and has significant potential for widespread adoption.

[0024] The above-described embodiments represent only two implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A rollable and foldable flexible circuit board, characterized in that: The invention comprises a first circuit board, a second circuit board and a fiber layer arranged between the first circuit board and the second circuit board; the first circuit board and the second circuit board each comprise an effective area and a board edge area, the board edge area being arranged on both sides of the effective area; a guide groove is provided on the outer edge of the board edge area extending inward; and hollow holes are provided on the fiber layer.

2. The rollable and foldable flexible circuit board according to claim 1, wherein: The guide grooves are arranged to extend horizontally, and the guide grooves on the same side of the first circuit board and the second circuit board are arranged to be staggered up and down.

3. The rollable and foldable flexible circuit board according to claim 2, wherein: The guide grooves on both sides of the first circuit board or the second circuit board are also staggered.

4. The rollable and foldable flexible circuit board according to claim 1, wherein: The first circuit board and the second circuit board are further provided with a plurality of heat dissipation holes, and the heat dissipation holes are provided corresponding to the guide grooves.

5. The rollable and foldable flexible circuit board according to claim 4, wherein: The heat dissipation holes are arranged to extend obliquely, and their extending direction is consistent with the extending direction of the guide groove.

6. The rollable and foldable flexible circuit board according to claim 2, wherein: The hollow holes are arranged in a diamond shape, and the horizontal relative angles thereof are parallel to the horizontal line of the circuit board, and the other two relative angles are parallel to the vertical line of the circuit board.

7. The rollable and foldable flexible circuit board according to claim 1, wherein: The guide groove is arranged in an arc shape, and the ammonium vacancies on the fiber layer are arranged in an octagonal shape.

8. The rollable and foldable flexible circuit board according to claim 7, wherein: The multiple octagons are evenly arranged, and the four groups of diagonal corners of the octagons and the corresponding corners of the adjacent hollow holes are on the same horizontal, vertical or inclined straight line.

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