Strip-shaped flexible circuit board capable of being folded at limited angle

Abstract

The utility model provides a strip-shaped flexible circuit board capable of being folded at a limited angle, which comprises a plurality of strip-shaped flexible board assemblies, each strip-shaped flexible board assembly is provided with a flexible circuit strip and a plurality of metal contact pieces, each flexible circuit strip is formed by hot melting of an upper flexible layer and a lower flexible layer, a plurality of groups of concave holes are correspondingly arranged in the upper flexible layer and the lower flexible layer, and the metal contact pieces are arranged in the concave holes. The flexible circuit strip is provided with an inner concave hole, each metal contact piece is welded in the inner concave hole in a fusion mode, a plurality of folding arc grooves are evenly formed in the two ends of the flexible circuit strip, the folding arc grooves are formed in the two sides between each group of metal contact pieces, and the folding range of the folding arc grooves is + / -60 degrees. The utility model relates to the technical field of flexible circuit boards.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible circuit boards, in particular to a strip-shaped flexible circuit board that can be folded at a limited angle. Background Art

[0002] As the trend of miniaturization and portability of electronic devices becomes increasingly prominent, the demand for foldable electronic components is growing, especially in the fields of wearable devices, flexible displays, portable medical devices, etc. Traditional rigid circuit boards are difficult to meet the high requirements of flexibility and space utilization efficiency in these applications due to their inherent shape limitations. Therefore, flexible circuit boards, with their thin, bendable and resistant characteristics, have gradually become one of the key technologies for connecting various electronic components.

[0003] However, most existing flexible circuit boards are limited to free bending within a two-dimensional plane. For application scenarios that require precise folding within a preset angle range, such as the hinge part of a foldable screen, electronic integrated modules in complex mechanical structures, etc., traditional flexible circuit boards often have difficulty meeting the established performance indicators. Especially when multiple foldings are required and the folding angles need to be strictly controlled each time, existing solutions often face problems such as short folding life, poor signal transmission stability, and easy damage to the folding area.

[0004] Therefore, it is imperative to redesign a strip-shaped flexible circuit board that can be folded at a limited angle. Utility Model Content

[0005] In view of the defects of the above-mentioned prior art, the utility model provides a strip-shaped flexible circuit board that can be folded at a limited angle, aiming to solve the problems of insufficient folding reliability, electrical stability and durability faced by existing flexible circuit boards in applications where they are folded at specific angles.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a strip-shaped flexible circuit board that can be folded at a limited angle, including a plurality of strip-shaped flexible board components, the strip-shaped flexible board components are provided with a flexible circuit strip and a plurality of metal contacts, the flexible circuit strip is formed by hot-melting an upper flexible layer and a lower flexible layer, and a plurality of groups of inner concave holes are correspondingly provided in the upper flexible layer and the lower flexible layer, each of the metal contacts is melt-welded in the inner concave hole, a plurality of folding arc grooves are evenly provided at both ends of the flexible circuit strip, and the folding arc grooves are provided on both sides between each group of the metal contacts, and the folding range of the folding arc grooves is ±60°.

[0007] Based on the above, the beneficial effect of a strip-shaped flexible circuit board that can be folded at a limited angle is to solve the problems of insufficient folding reliability, electrical stability and durability faced by existing flexible circuit boards in specific angle folding applications, which is mainly reflected in:

[0008] 1. The utility model solves the problem that traditional flexible circuit boards cannot be stably folded at a specific angle by setting uniform folding arc grooves at both ends of the flexible circuit strip, and the folding range is ±60°. It is particularly suitable for folding electronic devices that require precise angle control, such as foldable screen mobile phones, wearable devices, etc., and improves the design flexibility and user experience of the product;

[0009] 2. In the utility model, several metal contacts embedded in the flexible circuit strip are fixed in the inner concave hole by welding, and every two metal contacts are connected by copper wire. This design ensures the continuity of the circuit and the stability of the electrical performance during multiple folding and unfolding, effectively avoiding the interruption or weakening of signal transmission, and improving the overall reliability of the circuit board;

[0010] 3. The flexible circuit strip of the utility model is formed by hot-melting the upper flexible layer and the lower flexible layer, which helps to improve the flexibility and durability of the flexible circuit board; and the fine crease grooves and tear-assisting circular holes between the plurality of strip-shaped flexible board components are mainly used to facilitate the correct and efficient division of the integrated flexible circuit board material into separate strip-shaped flexible board components, ensuring the accuracy and convenience of the division process, and indirectly supporting the independent use and assembly of subsequent components;

[0011] 4. The utility model provides convenience for additional electronic components or external connections by adding contact recesses between the upper flexible layer and the lower flexible layer, so that the circuit board can better adapt to the needs of complex electronic system integration, increasing the versatility and application range of the product.

[0012] Furthermore, a filament crease groove is arranged between every two of the strip-shaped flexible plate components, and a plurality of tear-aiding circular holes are evenly arranged on the filament crease groove. The folding arc groove is formed by the tear-aiding circular holes after every two of the strip-shaped flexible plate components are torn apart along the filament crease groove.

[0013] Based on the above, the beneficial effect of the filament crease groove is that it ensures that the flexible circuit board can be accurately and non-destructively separated into independent components through the preset tear guide line, thereby improving the convenience and efficiency of manufacturing and assembly; the beneficial effect of the tear-assisting circular hole is that it simplifies the separation operation between each strip flexible board component, helping users or automated equipment to accurately control the tearing direction.

[0014] Furthermore, the inner concave holes on the flexible circuit strip are arranged alternately in groups of three and groups of two, wherein there are a plurality of groups of two inner concave holes on each of the adjacent two sides of a group of three inner concave holes.

[0015] Furthermore, each of the metal contact pieces is conductively connected via a copper wire, and the copper wire is disposed between the upper flexible layer and the lower flexible layer.

[0016] Furthermore, several groups of contact recessed holes are arranged between the upper flexible layer and the lower flexible layer, metal contacts are melt-welded in the contact recessed holes, and each group of the contact recessed holes is arranged between the second group of inner recessed holes in a group of three and the third group of inner recessed holes in a group of two on both sides of the inner recessed holes in a group of three.

[0017] Based on the above, the beneficial effects of the contact recess are to optimize the internal structure of the circuit board, provide a fixed installation site for adding electronic components or expanding the circuit, and enhance the multifunctional integration capability of the circuit board.

[0018] Furthermore, the flexible circuit strip is made of flexible material.

[0019] In order to more clearly illustrate the above features of the present invention and the objectives to be achieved, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : A schematic diagram of a strip-shaped flexible circuit board composed of two strip-shaped flexible board components;

[0021] Figure 2 : is a schematic diagram of a strip-shaped flexible plate assembly of the utility model;

[0022] Figure 3 : It is a schematic diagram of the folding of the strip-shaped flexible plate assembly of the utility model;

[0023] Figure 4 : It is a schematic diagram of folding the strip-shaped flexible plate assembly of the utility model in another direction;

[0024] Figure 5 : It is a cross-sectional schematic diagram of the unmelted metal contact sheet between the upper flexible layer and the lower flexible layer of the utility model;

[0025] Figure 6 : It is a cross-sectional schematic diagram of the metal contact sheet fused between the upper flexible layer and the lower flexible layer of the utility model;

[0026] Figure 7 : It is a cross-sectional schematic diagram of the contact concave hole between the upper flexible layer and the lower flexible layer of the utility model;

[0027] Figure 8 : It is a cross-sectional schematic diagram of the fusion welding contact concave hole between the upper flexible layer and the lower flexible layer of the utility model.

[0028] Description of the accompanying drawings: 1-strip flexible board assembly, 11-flexible circuit strip, 111-upper flexible layer, 112-lower flexible layer, 113-inner concave hole, 114-contact concave hole, 1141-metal contact, 12-metal contact sheet, 2-thin wire crease groove, 3-tear-assisting circular hole, 4-folded arc groove, 5-copper wire. DETAILED DESCRIPTION

[0029] like Figure 1-Figure 8 As shown, a strip-shaped flexible circuit board that can be folded at a limited angle includes a plurality of strip-shaped flexible board components 1, wherein the strip-shaped flexible board components 1 are provided with a flexible circuit strip 11 and a plurality of metal contacts 12, wherein the flexible circuit strip 11 is formed by hot-melting an upper flexible layer 111 and a lower flexible layer 112, wherein the upper flexible layer 111 and the lower flexible layer 112 are respectively provided with a plurality of groups of inner concave holes 113, wherein each of the metal contacts 12 is welded in the inner concave hole 113, and a plurality of folding arc grooves 4 are evenly provided at both ends of the flexible circuit strip 11, wherein the folding arc grooves 4 are provided on both sides between each group of the metal contacts 12, and the folding range of the folding arc grooves 4 is ±60°.

[0030] A filament crease groove 2 is arranged between every two of the strip-shaped flexible plate components 1, and a plurality of tear-aiding circular holes 3 are evenly arranged on the filament crease groove 2. The folding arc groove 4 is formed by the tear-aiding circular holes 3 after every two of the strip-shaped flexible plate components 1 are torn apart along the filament crease groove 2.

[0031] The inner recessed holes 113 on the flexible circuit strip 11 are arranged alternately in groups of three and groups of two, wherein there are a plurality of groups of two inner recessed holes 113 on each of the two adjacent sides of a group of three inner recessed holes 113 .

[0032] Each of the metal contact pieces 12 is conductively connected via a copper wire 5 , and the copper wire 5 is disposed between the upper flexible layer 111 and the lower flexible layer 112 .

[0033] Several groups of contact recessed holes 114 are also arranged between the upper flexible layer 111 and the lower flexible layer 112. Metal contacts 1141 are melt-welded in the contact recessed holes 114. Each group of the contact recessed holes 114 is arranged between the second group of inner recessed holes 113 in a group of three and the third group of inner recessed holes 113 in a group of two on both sides of the inner recessed holes 113 in a group of three.

[0034] The flexible circuit strip 11 is made of flexible material.

[0035] In summary, the specific implementation of the utility model is as follows: first, a flexible material with high flexibility and bending resistance is selected as the upper flexible layer 111 and the lower flexible layer 112, and the two layers of material are firmly bonded through a precise hot-melt process to form the basic structure of the flexible circuit strip 11, ensuring that it can still maintain good electrical performance and physical form after multiple foldings; during the hot-melt process, inner concave holes 113 are simultaneously formed at predetermined positions, and these inner concave holes are arranged according to a specific arrangement pattern, and then the metal contact sheet 12 is accurately welded in each inner concave hole to ensure electrical The stability and mechanical strength of the electrical connection are improved. Each two metal contacts are electrically connected between the two flexible layers through the copper wire 5, which further enhances the continuity and stability of the circuit. In the overall design stage of the flexible circuit board, the positions of the filament crease grooves 2 are planned, and the tear-assisting circular holes 3 are pre-arranged on these filament crease grooves. When the strip flexible board component 1 needs to be separated, the operator gently tears along the filament crease grooves 2 using the tear-assisting circular holes 3 as the starting point. In this process, the positions of the original tear-assisting circular holes 3 on both sides of the torn strip flexible board component 1 will naturally form folded arc grooves 4.

[0036] Using a tear-assisting circular hole 3 in the flexible circuit board as the starting point, gently tear it open towards both ends along the filament crease groove 2. Due to the design of the tear-assisting circular hole, the entire separation process is accurate and does not damage the circuit board, thereby efficiently dividing the integrated flexible circuit board material into independent strip-shaped flexible board components 1; each independent strip-shaped flexible board component 1 can be accurately folded by ±60° along the folding arc groove 4 as needed. This design allows the circuit board to flexibly adjust its shape in different application scenarios to meet the needs of folding at specific angles, such as applications in foldable electronic devices; the folded strip-shaped flexible board component 1 can be freely assembled according to product design requirements, and the contact recessed holes 114 can be used to integrate additional electronic components or connect to other circuit boards to achieve rapid construction of complex electronic systems; the electrical connection between the metal contact and the copper wire ensures the continuity and stability of the circuit during this process, and can maintain high performance even after multiple folding and assembly and disassembly.

[0037] The above description is only the optimal solution embodiment of the present invention and is not intended to limit the present invention. Various modifications or substitutions made to the present invention by those skilled in the art without departing from the essence and protection scope of the present invention should also be within the protection scope of the present invention.

Claims

1. A strip-shaped flexible circuit board that can be folded at a limited angle, characterized in that: The invention comprises a plurality of strip-shaped flexible board components (1), wherein the strip-shaped flexible board components (1) are provided with a flexible circuit strip (11) and a plurality of metal contact sheets (12), wherein the flexible circuit strip (11) is formed by hot-melting an upper flexible layer (111) and a lower flexible layer (112), wherein the upper flexible layer (111) and the lower flexible layer (112) are respectively provided with a plurality of groups of inner concave holes (113), wherein each of the metal contact sheets (12) is welded in the inner concave hole (113), and wherein a plurality of folding arc grooves (4) are evenly provided at both ends of the flexible circuit strip (11), wherein the folding arc grooves (4) are provided on both sides between each group of the metal contact sheets (12), and wherein the folding range of the folding arc grooves (4) is ±60°.

2. The strip-shaped flexible circuit board that can be folded at a limited angle according to claim 1, characterized in that: A filament crease groove (2) is arranged between every two of the strip-shaped flexible plate components (1), and a plurality of tear-aiding circular holes (3) are evenly arranged on the filament crease groove (2). The folding arc groove (4) is formed by the tear-aiding circular holes (3) after every two of the strip-shaped flexible plate components (1) are torn apart along the filament crease groove (2).

3. The strip-shaped flexible circuit board that can be folded at a limited angle according to claim 1, characterized in that: The inner recessed holes (113) on the flexible circuit strip (11) are arranged alternately in groups of three and groups of two, wherein adjacent sides of a group of three inner recessed holes (113) are each provided with a plurality of groups of two inner recessed holes (113).

4. The strip-shaped flexible circuit board that can be folded at a limited angle according to claim 1, characterized in that: Each of the metal contact sheets (12) is conductively connected via a copper wire (5), and the copper wire (5) is arranged between the upper flexible layer (111) and the lower flexible layer (112).

5. The strip-shaped flexible circuit board that can be folded at a limited angle according to claim 1, characterized in that: A plurality of groups of contact recessed holes (114) are also arranged between the upper flexible layer (111) and the lower flexible layer (112), wherein metal contacts (1141) are melt-welded in the contact recessed holes (114), and each group of the contact recessed holes (114) is arranged between the second group of inner recessed holes (113) in groups of two and the third group of inner recessed holes (113) in groups of two on both sides of the inner recessed holes (113) in groups of three.

6. The strip-shaped flexible circuit board capable of being folded at a limited angle according to claim 1, characterized in that: The flexible circuit strip (11) is made of flexible material.

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