Telescopic circuit board
By setting reinforcing blocks and elastic dielectric layer filling grooves at the bending parts of the stretchable circuit board, the problem of circuit breakage after stretching is solved, achieving higher stretchability and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AVARY HLDG (SHENZHEN) CO LTD
- Filing Date
- 2021-09-07
- Publication Date
- 2026-05-29
AI Technical Summary
Existing circuit boards are prone to circuit breakage after stretching, which affects their service life.
A reinforcing block is installed at the bend of the stretchable circuit board. The stress concentration at the bend is reduced by filling the groove between the extension and the elastic dielectric layer. The reinforcing block is used to cover the bend to reduce the risk of breakage.
This effectively reduces the risk of breakage of the stretchable circuit at bends, and improves the stretchability and service life of the circuit board.
Smart Images
Figure CN115776757B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit boards, and more particularly to a retractable circuit board. Background Technology
[0002] With the advent of robotics, wearable electronics, and new medical technologies, the requirements for the stretchability and flexibility of circuit boards are becoming increasingly stringent. However, existing circuit boards have limited stretchability, making them prone to circuit breakage after stretching, which in turn affects the product's lifespan. Summary of the Invention
[0003] In view of this, this application provides a retractable circuit board that helps reduce the risk of circuit breakage.
[0004] A stretchable circuit board includes a stretchable region extending along a first direction. The stretchable region includes an elastic dielectric layer and a plurality of spaced stretchable lines embedded in the elastic dielectric layer. Each stretchable line includes at least one bend and an extension connecting both ends of each bend. The stretchable region also includes a reinforcing block corresponding to each bend, and the bend is covered by the reinforcing block.
[0005] As one embodiment of this application, the reinforcing block includes a groove, the end of the extension connected to the bent portion covered by the reinforcing block is located in the groove, and the elastic dielectric layer fills the space between the groove and the end of the extension.
[0006] As one embodiment of this application, the depth of the groove is greater than or equal to 1 mm.
[0007] As one embodiment of this application, the extension extends from the bottom wall of the groove, and the distance between the inner sidewall of the groove and the corresponding extension in the first direction is greater than or equal to 0.2 mm.
[0008] As one embodiment of this application, the reinforcing block further includes a protrusion that extends from the bottom wall of the groove and is located between the extensions connecting the two ends of each bent portion covered by the reinforcing block.
[0009] As one embodiment of this application, the minimum distance between the end of the protrusion facing away from the bottom wall of the groove and the adjacent extension in the first direction is greater than or equal to 0.2 mm.
[0010] As one embodiment of this application, several of the retractable lines are spaced apart along a second direction perpendicular to the first direction.
[0011] As one aspect of this application, before the retractable circuit board is stretched along the first direction, the minimum included angle α between each extension and the first direction satisfies: 60°≤α≤90°.
[0012] As one embodiment of this application, after the stretchable circuit board is stretched along the first direction, the included angle α satisfies: α≥45°.
[0013] As one embodiment of this application, the stretchable area is a stretchable flexible single-layer circuit board, a double-layer circuit board, or a multi-layer circuit board.
[0014] As one embodiment of this application, the end of the extension connected to one end of the bend extends from the corresponding reinforcing block toward the extension connected to the other end of the bend.
[0015] As one embodiment of this application, the stretchable region further includes a plurality of reinforcing blocks, with each extension passing through one of the reinforcing blocks.
[0016] As one embodiment of this application, each of the reinforcing blocks has a recess on each of its two opposing surfaces spaced apart along a second direction perpendicular to the first direction, and the extension passes through the two recesses of the reinforcing block; the elastic dielectric layer fills the recesses.
[0017] As one aspect of this application, the retractable area includes a first end and a second end in the first direction, and the retractable circuit board further includes a first circuit area electrically connected to the first end and a second circuit area electrically connected to the second end, wherein the first circuit area and the second circuit area are respectively selected from a flexible circuit board, a rigid-flex circuit board, or a rigid circuit board.
[0018] The retractable circuit board of this application has a reinforcing block provided in the retractable circuit corresponding to the bending portion. The bending portion is covered by the reinforcing block. When the retractable area is stretched, the reinforcing block can reduce the stress at the bending angle or arc angle in the bending portion, thereby reducing the risk of the retractable circuit breaking at the bending angle or arc angle of the bending portion. Attached Figure Description
[0019] Figure 1 This is a perspective view of a retractable circuit board according to one embodiment of this application.
[0020] Figure 2 This is a cross-sectional schematic diagram of a retractable circuit board according to one embodiment of this application.
[0021] Figure 3 This is a schematic diagram of a retractable circuit board according to one embodiment of this application.
[0022] Figure 4 This is a cross-sectional schematic diagram of a retractable circuit board according to another embodiment of this application.
[0023] Figure 5 This is a schematic diagram of a retractable circuit board according to another embodiment of this application.
[0024] Figure 6 This is a schematic diagram of a retractable circuit board according to another embodiment of this application.
[0025] Figure 7 This is a partial schematic diagram of a retractable circuit board according to one embodiment of this application.
[0026] Figure 8 This is a schematic diagram of a retractable circuit board according to another embodiment of this application.
[0027] Figure 9 This is a partial schematic diagram of a retractable circuit board according to another embodiment of this application.
[0028] Figure 10 This is a partial schematic diagram of a retractable circuit board according to another embodiment of this application.
[0029] Figure 11 This is a partial schematic diagram of a retractable circuit board according to another embodiment of this application.
[0030] Figure 12 This is a partial schematic diagram of a retractable circuit board according to another embodiment of this application.
[0031] Explanation of main component symbols
[0032] Flexible circuit board 100 First direction X Flexible region 10 Elastic dielectric layer 11 Flexible circuit 13 Second direction Y Flexible circuit layer 130 Third direction Z Bending portion 131 Extension portion 133 Included angle Alpha, theta1, theta2 Reinforcing block 15 Groove 151 Protrusion 153 Center line O-O Reinforcing block 17 Recess 170 First circuit region 30 Second circuit region 50
[0033] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation
[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
[0036] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments / implementations and features thereof can be combined with each other.
[0037] Please see Figure 1 A retractable circuit board 100 according to one embodiment of this application includes a retractable region 10 extending along a first direction X. The retractable region 10 is capable of various deformations such as stretching, bending, and twisting.
[0038] Please refer to the following: Figure 2 and Figure 3 The stretchable region 10 includes an elastic dielectric layer 11 and a plurality of spaced stretchable lines 13, wherein the stretchable lines 13 are embedded within the elastic dielectric layer 11. In this embodiment, the stretchable lines 13 may be completely covered by the elastic dielectric layer 11. The elastic dielectric layer 11 is a transparent elastic material. In some embodiments, the elastic dielectric layer 11 may also be a translucent or non-transparent elastic material.
[0039] Specifically, in this embodiment, a plurality of the retractable lines 13 are spaced apart along a second direction Y perpendicular to the first direction X. In some embodiments, please refer to [the relevant documentation]. Figure 4 The retractable circuitry 13 is distributed in the plane directions of the first direction X and the second direction Y to form a retractable circuitry layer 130. Multiple retractable circuitry layers 130 may be spaced apart in a third direction Z perpendicular to the first direction X and the second direction Y. That is, the retractable area 10 may be a double-layer circuit board or a multi-layer circuit board. In this embodiment, the retractable area 10 is described using an example of only one retractable circuitry layer 130, meaning the retractable area 10 is a retractable flexible single-layer circuit board.
[0040] Each of the retractable lines 13 includes at least one bend 131 and an extension 133 connecting the two ends of each bend 131.
[0041] Each of the aforementioned bends 131 includes at least one bend angle (not shown in the figure) or arc angle (not shown in the figure). For example... Figure 3 As shown, each of the aforementioned bends 131 may include two bend angles. For example... Figure 5 As shown, each of the aforementioned bends 131 may include a bend angle. When all the bends 131 in a retractable line 13 include a bend angle, the retractable line 13 may be serrated. Figure 6 As shown, each of the aforementioned bends 131 may include an arc angle. When all the bends 131 in a retractable line 13 include an arc angle, the retractable line 13 is wavy. It is understood that when a retractable line 13 includes multiple bends 131, the structures of any two bends 131 in the same retractable line 13 may be the same or different.
[0042] Please refer to the following: Figure 3 Each of the extensions 133 intersects the first direction X. Preferably, before the stretchable region 10 is stretched along the first direction X, the minimum included angle α between each of the extensions 133 and the first direction X satisfies: 60°≤α≤90°; after the stretchable region 10 is stretched along the first direction X, the included angle α satisfies: α≥45°, so that the extension 133 has a larger cross-sectional area in the second direction Y, which is beneficial to resisting tensile deformation and meeting higher strength tensile requirements.
[0043] The angles between the two extensions 133 connected to the same bend 131 and the first direction X, and which are facing each other, are θ1 and θ2, respectively, wherein θ1 may be equal to or unequal to θ2.
[0044] The stretchable region 10 also includes a reinforcing block 15 corresponding to each of the bending portions 131. The bending portion 131 is covered by the reinforcing block 15. When the stretchable region 10 is stretched, the reinforcing block 15 can reduce the stress at the bending angle or arc angle in the bending portion 131, thereby reducing the risk of the stretchable line 13 breaking at the bending angle or arc angle of the bending portion 131.
[0045] In some implementations, such as Figure 7 As shown, each of the reinforcing blocks 15 may cover only one of the bent portions 131. In some embodiments, such as Figure 3 As shown, each of the reinforcing blocks 15 can cover the bends 131 that are spaced apart and correspondingly arranged along the second direction Y in a plurality of the retractable lines 13.
[0046] In some embodiments, preferably, the reinforcing block 15 may include a groove 151, in which the end of the extension 133 connected to the bent portion 131 covered by the reinforcing block 15 is located. The elastic dielectric layer 11 fills the space between the groove 151 and the end of the extension 133, thereby helping to reduce stress concentration when the stretchable region 10 is stretched, and reducing the risk of breakage of the stretchable line 13.
[0047] More preferably, the depth of the groove 151 may be greater than or equal to 1 mm, which further helps to partially offset the stress generated when the stretchable area 10 is stretched by the elastic dielectric layer 11 filling the space between the groove 151 and the end of the extension 133, thereby helping to reduce stress concentration and reduce the risk of breakage of the stretchable line 13.
[0048] The thickness D1 of the reinforcing block 15 corresponding to the groove 151 in the first direction X is preferably greater than or equal to 2 mm, that is, the wall thickness of the groove 151 in the first direction X is preferably greater than or equal to 2 mm, which helps to limit the excessive deformation of the elastic dielectric layer 11 in the groove 151, thereby reducing the risk of circuit breakage in this area.
[0049] More preferably, when the extension 133 extends from the bottom wall of the groove 151, the distance between the inner wall of the groove 151 and the corresponding extension 133 in the first direction X can be greater than or equal to 0.2 mm. This further facilitates the partial offsetting of the stress generated when the stretchable area 10 is stretched by the elastic dielectric layer 11 filling the space between the end of the groove 151 and the extension 133, thereby reducing stress concentration and lowering the risk of breakage of the stretchable line 13.
[0050] In some implementation methods, please refer to the following: Figure 7 and Figure 8 The reinforcing block 15 may further include a protrusion 153, which protrudes from the bottom wall of the groove 151 and is located between the extensions 133 connecting the two ends of each bent portion 131 covered by the reinforcing block 15. This is to reduce the deformation of the portion of the elastic dielectric layer 11 filled in the groove 151 when stretched, so as to reduce the risk of breakage of the stretchable line 13 when the volume of the groove 151 is large.
[0051] Preferably, the minimum distance between the end of the protrusion 153 facing away from the bottom wall of the groove 151 and the adjacent extension 133 in the first direction X can be greater than or equal to 0.2 mm. This further facilitates the partial offsetting of the stress generated when the stretchable region 10 is stretched by the elastic dielectric layer 11 filling the space between the ends of the protrusion 153 and the extension 133, thereby reducing stress concentration and lowering the risk of breakage of the stretchable circuit 13. In this case, the extension 133 can extend from the bottom wall of the groove 151 or the inner sidewall of the groove 151.
[0052] In some implementation methods, please refer to the following: Figure 9 and Figure 10 The end of the extension 133, connected to one end of the bent portion 131, extends from the corresponding reinforcing block 15 toward the extension 133 connected to the other end of the bent portion 131. For example... Figure 9 and Figure 10In this configuration, the end of each extension 133 connected to the bend 131 can extend from the corresponding reinforcing block 15 towards the center line OO along the second direction Y, so that when the stretchable area 10 is stretched, the extension direction of the end of each extension 133 from the corresponding reinforcing block 15 is consistent with or close to the direction of force, reducing the shear stress at the end of the extension 133 and thus reducing the risk of breakage of the stretchable line 13. At this time, the groove 151 may or may not exist, and the protrusion 153 may or may not exist.
[0053] In some implementation methods, please refer to the following: Figure 11 The retractable region 10 may further include a plurality of reinforcing blocks 17. Each of the extensions 133 passes through one of the reinforcing blocks 17.
[0054] In some implementations, such as Figure 11 As shown, each of the reinforcing blocks 17 may be passed through only one of the extensions 133. In some embodiments, such as Figure 12 As shown, each of the reinforcing blocks 17 can be passed through by a plurality of extensions 133 extending from the same reinforcing block 15 and inclined to the same side relative to the second direction Y.
[0055] Preferably, each of the reinforcing blocks 17 may have a recess 170 on each of its two opposing surfaces spaced along the second direction Y, and the extension 133 passes through the two recesses 170 of the reinforcing block 17. The elastic dielectric layer 11 fills the recesses 170, thereby further reducing the risk of breakage of the stretchable circuit 13.
[0056] Please see Figure 1 The retractable region 10 includes a first end (not shown) and a second end (not shown) in the first direction X. The retractable circuit board 100 may further include a first circuit region 30, which is electrically connected to the first end of the retractable region 10. The first circuit region 30 may be a flexible circuit board, a rigid-flex circuit board, or a rigid circuit board.
[0057] In some embodiments, the elastic dielectric layer 11 may extend to the first circuit region 30.
[0058] The retractable circuit board 100 may further include a second circuit area 50, which is electrically connected to a second end of the retractable area 10. The second circuit area 50 may be a flexible circuit board, a rigid-flex circuit board, or a rigid circuit board.
[0059] In some embodiments, the elastic dielectric layer 11 may extend into the second circuit region 50.
[0060] The retractable circuit board 100 of this application has a reinforcing block 15 in its retractable line 13 corresponding to the bend 131. The bend 131 is covered by the reinforcing block 15. When the retractable area 10 is stretched, the reinforcing block 15 can reduce the stress at the bend angle or arc angle in the bend 131, thereby reducing the risk of the retractable line 13 breaking at the bend angle or arc angle of the bend 131.
[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although the preferred embodiment has been disclosed above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.
Claims
1. A stretchable circuit board, comprising a stretchable region extending along a first direction, the stretchable region including an elastic dielectric layer and a plurality of spaced stretchable lines embedded in the elastic dielectric layer, characterized in that, Each of the retractable lines includes at least one bend and an extension connecting both ends of each bend. The retractable area also includes a reinforcing block corresponding to each bend. The bend is covered by the reinforcing block. The reinforcing block includes a groove. The end of the extension connected to the bend covered by the reinforcing block is located in the groove. The elastic dielectric layer fills the space between the groove and the end of the extension.
2. The retractable circuit board as described in claim 1, characterized in that, The depth of the groove is greater than or equal to 1 mm.
3. The retractable circuit board as described in claim 1, characterized in that, The extension extends from the bottom wall of the groove, and the distance between the inner sidewall of the groove and the corresponding extension in the first direction is greater than or equal to 0.2 mm.
4. The retractable circuit board as described in claim 1, characterized in that, The reinforcing block also includes a protrusion that extends from the bottom wall of the groove and is located between the extensions connecting the two ends of each of the bent portions covered by the reinforcing block.
5. The retractable circuit board as described in claim 4, characterized in that, The minimum distance between the end of the protrusion facing away from the bottom wall of the groove and the adjacent extension in the first direction is greater than or equal to 0.2 mm.
6. The retractable circuit board as described in claim 1, characterized in that, Several of the retractable lines are spaced apart along a second direction perpendicular to the first direction.
7. The retractable circuit board as described in claim 1, characterized in that, Before the stretchable circuit board is stretched along the first direction, the minimum included angle α between each of the extensions and the first direction satisfies: 60°≤α≤90°.
8. The retractable circuit board as described in claim 7, characterized in that, After the stretchable circuit board is stretched along the first direction, the included angle α satisfies: α≥45°.
9. The retractable circuit board as described in claim 1, characterized in that, The stretchable area is a stretchable flexible single-layer circuit board, double-layer circuit board, or multi-layer circuit board.
10. The retractable circuit board as described in any one of claims 1 to 9, characterized in that, The end of the extension connected to one end of the bend extends from the corresponding reinforcing block toward the extension connected to the other end of the bend.
11. The retractable circuit board as claimed in claim 1, characterized in that, The retractable region also includes a plurality of reinforcing blocks, with each extension passing through one of the reinforcing blocks.
12. The retractable circuit board as described in claim 11, characterized in that, Each of the reinforcing blocks has a recess on each of its two opposing surfaces spaced apart along a second direction perpendicular to the first direction, and the extension passes through the two recesses of the reinforcing block; the elastic dielectric layer fills the recesses.
13. The retractable circuit board as claimed in claim 1, characterized in that, The retractable area includes a first end and a second end in the first direction. The retractable circuit board further includes a first circuit area electrically connected to the first end and a second circuit area electrically connected to the second end. The first circuit area and the second circuit area are respectively selected from a flexible circuit board, a rigid-flex circuit board, or a rigid circuit board.