CN111935900A - Flexible circuit connecting device, connecting method and method for protecting flexible circuit board - Google Patents
Flexible circuit connecting device, connecting method and method for protecting flexible circuit board Download PDFInfo
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- CN111935900A CN111935900A CN202010796952.4A CN202010796952A CN111935900A CN 111935900 A CN111935900 A CN 111935900A CN 202010796952 A CN202010796952 A CN 202010796952A CN 111935900 A CN111935900 A CN 111935900A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/0278—Rigid circuit boards or rigid supports of circuit boards locally made bendable, e.g. by removal or replacement of material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/028—Bending or folding regions of flexible printed circuits
- H05K1/0281—Reinforcement details thereof
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0217—Mechanical details of casings
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Abstract
The invention provides a flexible circuit connecting device, which is connected with equipment with a hard shell and further comprises a flexible substrate and a conductor layer; the bending strength of the flexible circuit connecting device at the local part connected with the equipment with the hard shell is larger than that of the flexible circuit connecting device far away from the equipment with the hard shell. When the flexible circuit connecting device provided by the invention is fixedly connected with equipment with a hard shell, the flexible circuit connecting device can be bent with uniform curvature under the action of external force, and no excessive bending point exists, so that the service life is prolonged, and the repair rate is reduced. The invention also provides a connection method of the flexible circuit board and a method for protecting the flexible circuit board.
Description
Technical Field
The invention relates to a flexible circuit connecting device, a connecting method and a method for protecting a flexible circuit board.
Background
A Flexible Printed Circuit (FPC) is a kind of Printed Circuit board, which is also called a Flexible Printed Circuit board, and has flexibility. The flexible circuit board is popular in the market with high reliability and excellent flexibility, has light weight and small volume, can be bent into various shapes and designed into a complex three-dimensional structure, and is very widely applied.
Flexible circuit connection devices are used in applications where they must be bendable or where they need to be held in a bent state for a long period of time during use. Prior to the invention of flexible circuit boards, they were implemented using wire interconnects. Because the flexible circuit board not only has a single-sided flexible circuit, but also has double-sided and multi-layer flexible circuits, the flexible circuit connecting device can combine several circuit components or equipment with complicated interconnection.
In large medical diagnostic equipment magnetic resonance systems, the surface coils need to be covered or wrapped around the surface of the human body during imaging, and therefore a flexible circuit board must be used. The magnetic resonance surface coil is formed by welding tuning components on a flexible circuit board, fixing a corresponding hard shell on the flexible circuit board to protect the tuning components inside, and leading out magnetic resonance signals through a connecting cable. Flexible circuit connections are required between these tuning components to communicate.
In the diagnosis practice of a magnetic resonance system, the flexible circuit connecting device is found to be easily damaged at the local position of a hard shell for protecting a tuning component, and the repair rate is high. This is because the flexible circuit connection device is deformed by an external force during use, and the local deformation is larger where the hard case is fixed.
There are many uses in everyday life for connecting rigid devices with flexible circuits, such as in print heads, and in virtual reality audio-visual equipment.
Disclosure of Invention
The invention provides a flexible circuit connecting device, a connecting method and a method for protecting a flexible circuit board, aiming at solving the problem of high repair rate in the prior art.
In order to solve the above problems, the technical solution adopted by the present invention is as follows:
a flexible circuit connection device is connected to a device with a hard shell and further comprises a flexible substrate and a conductor layer; the bending strength of the flexible circuit connecting device at a local position where the device with the hard shell is connected is larger than that at a local position far away from the device with the hard shell.
In one embodiment of the invention, the thickness of the flexible circuit connecting device at a local position connected with the equipment with the hard shell is larger than that at a local position far away from the equipment with the hard shell.
Preferably, the thickness of the flexible substrate varies in a length direction of the flexible circuit board, and is the largest at a portion where the flexible circuit connection device is connected to the apparatus having the hard case.
Preferably, the flexible substrate has a plurality of layers, and the number of layers of the substrate varies in the longitudinal direction of the flexible circuit connection device, and is the largest at a portion where the flexible circuit connection device is connected to the device having the hard case.
Preferably, the flexible substrate is cut out in a plane and a partial area is subtracted from a partial thickness, the subtracted area being the smallest at a portion where the device with the hard cover is attached.
In one embodiment of the invention, an insulating film part with an adjusted thickness is attached to the surface of the flexible circuit connecting device, and the width of the insulating film part with the adjusted thickness at a local position where the device with the hard shell is connected is larger than the width of the insulating film part with the adjusted thickness at a local position far away from the device with the hard shell.
Preferably, the thickness-adjusted insulating film member has a bending strength greater than that of the flexible circuit connecting device.
Preferably, the planar shape of the insulating film member for adjusting the thickness is a triangle, or more than one triangles are juxtaposed, and one side of the triangle is located at a portion where the flexible circuit connecting device is connected to the device having the hard case.
The invention also provides a flexible circuit connecting method, which uses any one of the flexible circuit connecting devices; and then fixedly connected to equipment with a hard shell.
The invention also provides a method for protecting the flexible circuit board, which is used for connecting equipment with a hard shell; the method comprises the following steps: firstly, attaching an insulating film component with the thickness adjusted on the surface of the flexible circuit board, and then fixing equipment with a hard shell on the flexible circuit board; the thickness-adjustable insulating film member has a maximum width at a portion where the device having the hard case is connected and a gradually decreasing width in a direction away from the device having the hard case.
Preferably: the thickness-adjusted insulating film member has a greater bending strength than the flexible circuit connection device.
The invention has the beneficial effects that: the flexible circuit connecting device, the connecting method and the method for protecting the flexible circuit board are provided, because the bending strength of the local position of the connecting position of the flexible circuit board is the maximum, the curvature of deformation under the working state is uniform, excessive bending points do not exist, the repair rate of the flexible circuit connecting device is reduced, and the service life of the flexible circuit connecting device is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a flexible circuit board of a magnetic resonance surface coil.
Fig. 2 is a schematic cross-sectional view of an apparatus with a rigid housing attached to a flexible circuit connection.
Fig. 3 and 4 are schematic cross-sectional views of an embodiment of the apparatus of the present invention in which a flexible circuit connecting device is connected with a hard case.
Fig. 5, 6 and 7 are schematic perspective views of another embodiment of the device with a rigid housing connected to a flexible circuit connecting device according to the present invention.
Fig. 8 and 9 are schematic diagrams of the design of the flex circuit connection apparatus of the present invention for bend resistance testing.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. The implementation of the invention is not limited to the embodiments described below, but can be implemented in many different forms. The following examples are put forth so as to provide a more thorough understanding of the present disclosure.
It should be noted that, in the present specification, an element described as being "fixed" to another element means that the element is directly on the other element or that other intervening elements may exist therebetween; the description that an element is "connected" to another element means that the element is directly connected to the other element or intervening elements may be present therebetween.
Unless defined otherwise, 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 invention belongs, and the terms used herein are intended to describe specific embodiments only and are not intended to limit the present invention.
The flexible circuit board can be divided into a single panel, a double panel, a multi-panel, etc., and a three-layer flexible copper-clad circuit board is taken as an example, and the structure of the flexible copper-clad circuit board comprises copper metal foil, insulating foil and insulating film, wherein the copper metal foil is attached to the two side surfaces of the insulating foil, the insulating film is attached to the surface of the copper metal foil, and the flexible copper-clad circuit board is formed by hot pressing through an interlayer adhesive. Wherein the copper foil generally comprises rolled copper foil and electrolytic copper foil, and the breaking elongation of the copper foil can respectively reach about 10% and 4%; particularly, the copper foil prepared by the rolling method has better electrical and mechanical properties and better toughness, and the flexing resistance of the high-precision rolled copper foil (the thickness is generally below 20 mu m) can reach tens of thousands of times or even hundreds of millions of times. The insulating film and the insulating foil are generally made of polyester film, polyimide film, or the like, and materials having good dielectric properties, chemical resistance, and low moisture absorption, as well as good dimensional stability and thermal stability are generally selected. The main interlayer adhesive is epoxy resin, acrylate resin and the like. The interlayer adhesive is used for adhesion of the conductive copper metal foil to the insulating film, and plays an important role in heat resistance, chemical resistance and dielectric properties of the flexographic plate.
The flexible circuit connecting device is an application mode of a flexible circuit board, and refers to that the flexible circuit board is used for connecting equipment or components, particularly connecting the equipment or the components with a hard shell. The flexible substrate herein refers to an intermediate layer of the flexible circuit board, i.e., an insulating foil layer.
As seen from the manufacturing materials of the flexible circuit board, the plasticity and the fatigue resistance of the flexible circuit board are good, but the repair rate is high when the flexible circuit connecting device is connected to equipment or components with hard surfaces. This is because although the flexible circuit board is relatively plastic, the deformation it undergoes cannot be smaller than its inherent minimum bending radius, and when the deformation of the flexible circuit board is smaller than its inherent minimum bending radius, the flexible circuit board is damaged by excessive bending or performance is degraded. When the flexible circuit board is fixed to equipment or devices with a hard shell, the edge of the hard shell becomes the position where the flexible circuit board is most seriously deformed by external force and becomes the position where the bending degree of the flexible circuit board is most serious, so that the electrical property of the flexible circuit board is damaged and the flexible circuit board needs to be returned to a factory for maintenance. The flexible circuit connecting device and the equipment with the hard shell are frequently bent repeatedly in the using process, the deformation born by the hard shell often exceeds the minimum bending radius, the bending damage is formed, and the repair rate is very high.
Under the same external force, the plate-shaped material with high bending strength has larger bending radius, and the plate-shaped material with low bending strength has smaller bending radius. The plate-shaped material having a small bending strength is more flexible. For the same plate-shaped material, the larger the thickness, the greater the bending strength, the smaller the thickness, and the smaller the bending strength.
Fig. 1 is a schematic structural diagram of a flexible circuit board of a surface coil, in which a flexible circuit board 20 is located on a surface coil housing 10, and includes a hard housing 50 fixed on the flexible circuit board 20; not shown are components housed within the rigid housing 50 and electrically connected to the circuit board. The soldered points of the outgoing cables 71 are also protected inside a hard shell, as shown in fig. 1.
As in fig. 1, the thickness of the surface coil housing 10 and the flexible circuit board 20 is thinner compared to the hard housing 50. The hard cases 50 fixed to the flexible circuit board are distributed on the flexible circuit board 20 and have various shapes; the part of the flexible circuit board fixed with the hard shell has no flexibility any more. The flexible circuit board between two adjacent hard shells is a flexible circuit connecting device. The surface coil needs to be bent to be attached to the body of the patient during the use process, wherein repeated deformation of the flexible circuit board 20 relative to the local position of the hard shell 50 affects the performance of the local position, which causes the working failure of the surface coil and needs to be repaired.
One solution is to place a flexible substrate between the contact surfaces of the rigid housing and the flexible circuit board, so that the rigid housing does not directly contact the flexible circuit board, and the schematic cross-sectional structure thereof is shown in fig. 2, where 201 is a cross section of the flexible circuit board, 501 is a cross section of the rigid housing, and 901 is a flexible substrate added between the contact surfaces of the rigid housing and the flexible circuit board in fig. 2. The flexible substrate 901 protects the interface between the rigid housing and the flexible circuit board, but practice has shown that with such a process, the rework rate of the surface coils is still too high.
The same high rework rate problem exists when the flexible circuit connection is attached to equipment having a rigid housing. What is needed is a flexible circuit connection device that has a relatively uniform curvature when forced to bend in an operational state, with a large arc.
For this reason, the thickness of the flexible circuit connection device of the present invention is largest at a portion where the device having the hard case is connected and is reduced at a portion distant from the device having the hard case. The local bending strength of the flexible circuit connecting device can be changed by changing the local thickness of the flexible circuit connecting device, if the materials are the same, the bending strength is larger when the thickness is larger, so that the thickness of the flexible substrate in the flexible circuit board is changed, or the thickness distribution of the flexible circuit board is changed by attaching a flexible substrate (an insulating film) on the surface of the flexible circuit board.
In one embodiment of the present invention, the thickness distribution of the flexible circuit board is changed by attaching an insulating film of an adjusted thickness on one side surface of the flexible circuit connection device. Fig. 3 is a schematic cross-sectional view of an embodiment of the apparatus of the present invention in which a flexible circuit connecting device is connected with a hard case. The flexible circuit board 203 is fixedly connected to the hard case 503, and the flexible substrate 903 serves as an insulating film to increase the thickness of the flexible circuit board 203. As can be seen from fig. 3, in this embodiment of the present invention, the flexible substrate 903 has a larger area than the flexible substrate 901 in fig. 2, and the entire plane of the flexible substrate 903 is uniformly and evenly attached to the flexible circuit board; and its area is also attached to a portion other than the hard cover 503.
In one embodiment of the present invention, the thickness distribution of the flexible circuit board is also changed by attaching insulating films on both side surfaces of the flexible circuit board at the same time.
In one embodiment of the present invention, the thickness of the insulating film attached to the flexible circuit board is gradually decreased in the length direction of the flexible circuit connection means, and is maximized at a portion where the flexible circuit connection means is connected to the device or the component having the hard surface. The thickness of the flexible substrate is changed in the length direction of the flexible circuit board, and the thickness is maximized at the portion where the flexible circuit connecting means connects the device with the hard case. Fig. 4 is a schematic cross-sectional view of an embodiment of the device of the present invention in which a flexible circuit connecting device is connected with a hard case. The flexible circuit board 204 is connected to the rigid housing 504, and has a flexible base 904 attached to the flexible circuit board 204, and the flexible base 904 has a maximum thickness at the position where the rigid housing device 503 is fixed and a gradually decreasing thickness at the position away from the rigid housing device 503 as an insulating film, and in this embodiment of the present invention, because the thickness of the flexible base 903 is gradually decreased in the length direction of the flexible circuit board, the cross-sectional shape thereof is similar to a triangle.
According to the technical scheme, the local thickness of the flexible circuit board is increased, so that the local bending strength is increased, the local deformation of the position where the hard shell is located is small under the action of the same external force, the probability that the deformation exceeds the minimum bending radius is reduced, and the repair rate of equipment is reduced.
In the application scenario of flexible circuit boards, however, the relatively large thickness is often not acceptable, and the real requirement of miniaturization is rather calling for thinner circuit boards and more compact circuit designs.
The invention selects the insulating film with the thickness less than 1 mm and a specific shape to be attached on the surface of the flexible circuit board.
The insulating film attached on the surface of the flexible circuit board in one embodiment of the present invention has a greater bending strength than that of the flexible circuit board.
In one embodiment of the present invention, the thickness distribution of the flexible circuit board is also changed by changing the ratio of the width of the insulating film attached to the surface to the width of the flexible circuit board; the planar shape of the insulating film is a triangle or a plurality of triangles (similar to a sawtooth shape) which are arranged side by side, and one side of the triangle is positioned at the part where the flexible circuit connecting device is connected with the equipment or the device with the hard surface. When the shape of the insulating film is changed in the length direction of the flexible circuit connection device, the average thickness of the flexible circuit board in the width direction becomes gradually smaller in the length direction and the average thickness is largest at a portion where the flexible circuit board is connected to the device having the hard case; the ratio of the width of the film member whose thickness is adjusted to the width of the flexible circuit board is largest at a portion where the flexible circuit connecting apparatus is connected to the device having the hard case, and then gradually becomes smaller in the length direction of the flexible circuit connecting apparatus.
Referring to fig. 5, which is a schematic perspective view of another embodiment of the device of the present invention in which a flexible circuit connecting apparatus is connected with a rigid housing, the flexible circuit board 205 is connected with the device 505 of the rigid housing, and the flexible substrate 905 is attached to the flexible circuit board 205, in this embodiment of the present invention, the flexible substrate 905 is shaped like a triangle as an insulating film, and one side of the triangle is located at the connection position of the rigid housing 505 and the flexible circuit board 205.
Referring to fig. 6, a schematic perspective view of another embodiment of the device with a rigid housing attached to a flexible circuit connecting device according to the present invention is shown, the flexible circuit board 206 is attached to the device 506 with a rigid housing, and a flexible substrate 906 is attached to the flexible circuit board 206, in this embodiment of the present invention, the flexible substrate 906 is a dielectric film and has a saw-tooth shape, like a plurality of triangles arranged side by side.
The angle of the triangle of the flexible substrate 905 or 906 away from the angle of the hard shell 505 or 506 in fig. 5 or 6 is less than sixty degrees, for example the side of the triangle at the hard shell is half the height, or 3 mm on side and 5 mm high. And the corners of the triangle are rounded.
The triangular shape of the flexible substrate 905 or 906 in fig. 5 or 6 may also be other tapered shapes, such as a funnel shape with two tapered sides that continue to extend for a distance, as if the triangle were a splice with an elongated rectangle.
The shape of the insulating film attached to the surface of the flexible circuit board or the cut shape of the flexible substrate is to change the minimum bending radius of the flexible circuit board, so that the minimum bending radius of the equipment or device accessory fixed with the hard shell is increased, and the minimum bending radius of the equipment or device far away from the hard shell is not changed, thereby keeping the flexibility and the bending resistance. The technical scheme aims to change the thickness distribution of the flexible circuit connection device, and the average thickness of the flexible circuit connection device in the width direction is changed to be the largest at the position where the flexible circuit connection device is connected with equipment with a hard shell and then gradually reduced in the length direction of the flexible circuit connection device. Therefore, it is within the scope of the present invention to cut the shape of the flexible substrate or to change the shape of the insulating film attached to the surface of the flexible circuit board to achieve the above-mentioned object.
In one embodiment of the invention, the flexible substrate has multiple layers, and the thickness distribution of the flexible circuit board is changed by changing the number of local layers of the flexible substrate; for example, the number of layers of the flexible circuit board varies in the longitudinal direction thereof, and is the largest at the portion where the flexible circuit connecting device is connected to the device having the hard case.
Fig. 7 is a perspective view of another embodiment of the apparatus of the present invention in which a rigid housing is attached to a flexible circuit connector. The thickness distribution of the flexible circuit board is achieved by attaching an insulating film on one side surface of the flexible circuit board and cutting the insulating film. In the figure, 208 is an insulating film attached to the surface of the flexible circuit board, and 908 is a concave groove formed by cutting the insulating film 208. The concave groove 908 has a diamond shape, the width of the middle of the concave groove 908 means that more of the insulating film 208 is cut and removed, and the two ends of the concave groove 908 are gradually narrowed, which means that less of the insulating film 208 is cut and removed here. It can be seen that between devices 508 having rigid housings, the average thickness of the flexible circuit board in the width direction becomes smaller, and the closer to the rigid housing 508, the thicker the average thickness of the flexible circuit board in the width direction; the farther from the rigid case, the smaller the average thickness of the flexible circuit board in the width direction.
In one embodiment of the invention, the flexible substrate of the flexible circuit board is cut and subtracted with partial thickness, the area cut and subtracted with partial thickness is the smallest near the hard shell, and the area cut and subtracted with partial thickness is larger the farther away from the hard shell.
The flexible substrate 905 or 906 in fig. 5 or 6 may be made of a material having a bending strength greater than that of the flexible circuit board.
Because the shape of the insulating film attached to the surface of the flexible circuit board or the cut shape of the flexible substrate increases the bending strength at a local position near the device fixed with the hard shell, when the flexible circuit board is under the same external force, the deformation generated at the connection part is reduced, and a new bending damage cannot be formed at the end point of the flexible base material 905 or 906 in fig. 5 or 6 because the average thickness of the flexible base material is gradually changed (rather than suddenly changed), and the probability that the deformation exceeds the minimum bending radius on the whole flexible circuit board is reduced, thereby reducing the repair rate of the device. The flexible circuit board, remote from the device to which the rigid housing is secured, retains its flexibility and flex resistance.
Since the average thickness of the flexible circuit board in the width direction is the largest at the portion where the flexible circuit board is connected to the device having the hard case and then gradually decreases in the length direction of the flexible circuit board, the thickness distribution of the flexible circuit board is changed, that is, the average thickness of the flexible circuit board at a local position of the hard case is the thickest, and the average thickness of the flexible circuit board at a position away from the hard case gradually decreases.
The present invention is within the scope of protection of the present invention, in which the above-mentioned objects can be achieved by cutting the shape of the flexible substrate or by changing the shape of the insulating film attached to the surface of the flexible circuit board.
Fig. 8 and 9 are schematic views of the bending test device of the flexible circuit connection device of the present invention. The device 500 with a hard shell attached to the end of the flexible circuit connector 200 is shown in a fixed position with the end of the flexible circuit connector 200 attached to a weight 70 with a weight of 5 KG. In the fatigue test, the counterweight 70 repeatedly falls freely, so that the flexible circuit board 200 is repeatedly bent downward.
As seen in fig. 8 and 9, the flexible circuit connecting apparatus 200 has hard cover devices 500 on both side surfaces thereof, and a zigzag-shaped flexible base material 906 is provided on the flexible circuit board 200 between the hard covers 500.
In the course of project development, experimental data of a flexible circuit board without the added flexible substrate are compared as shown in table one:
table one:
as an embodiment, the flexible circuit connecting device provided by the invention has the advantages that the flexible base material with a specific shape is added at the joint of the hard shell and the flexible circuit board, so that the bending strength is obviously improved, and the flexible circuit connecting device is applied to a magnetic resonance surface coil, and the repair rate is greatly reduced.
When a component or equipment with a hard shell needs to be connected with a flexible circuit, the method of the invention comprises the following steps:
preparing any one of the flexible circuit connecting devices; and then fixedly connected with equipment or equipment with a hard shell.
When the flexible circuit board is connected with a device or a device with a hard shell, any one of the flexible circuit connection devices needs to be prepared, for example:
firstly, attaching an insulating film component with the thickness adjusted on the surface of the flexible circuit board, and then fixing equipment with a hard shell on the flexible circuit board; the thickness-adjustable insulating film member has a maximum width at a portion where the device having the hard case is connected and a gradually decreasing width in a direction away from the device having the hard case.
Or:
firstly, attaching an insulating film component with the thickness adjusted on the surface of the flexible circuit board, and then fixing equipment with a hard shell on the flexible circuit board; the thickness of the insulating film member is adjusted to be the largest at a portion where the device having the hard case is connected, and the thickness of the insulating film member is gradually decreased in a direction away from the device having the hard case.
Other combinations of the features of the embodiments described above are possible and not all possible combinations of features are fully described herein for the sake of brevity. It is to be understood that all combinations of the above features are included in the scope of the present specification unless they are contradictory.
The above examples specifically and in detail describe several embodiments of the invention, which are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. All changes, equivalents and modifications that come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A flexible circuit connection device is connected to a device with a hard shell and further comprises a flexible substrate and a conductor layer; the bending strength of the flexible circuit connecting device at a local position where the device with the hard shell is connected is larger than that at a local position far away from the device with the hard shell.
2. The flexible circuit connection device according to claim 1, wherein the flexible circuit connection device has a thickness at a local position where the apparatus having the hard cover is connected, which is larger than a thickness at a local position away from the apparatus having the hard cover.
3. The flexible circuit connection unit according to claim 2, wherein the flexible substrate has a plurality of layers, and the number of layers of the substrate varies along a length of the flexible circuit connection unit, with the largest number of layers being at a local location where the flexible circuit connection unit is connected to the device having the rigid housing.
4. The flexible circuit connection assembly of claim 2, wherein the flexible substrate is cut out in a plane and has a partial area subtracted from a partial thickness, the subtracted area being a minimum at a local location where the device with the rigid housing is attached.
5. The flexible circuit connecting apparatus according to claim 2, wherein an insulating film member of an adjusted thickness having a width larger at a local position where said device with a hard cover is connected than at a local position away from said device with a hard cover is attached to one side surface or both side surfaces.
6. The flexible circuit connection unit according to claim 5, wherein said thickness-adjusted insulating film member has a bending strength greater than that of said flexible circuit connection unit.
7. The flexible circuit connecting apparatus according to claim 5 or 6, wherein the planar shape of said thickness-adjusting insulating film member is a triangle or more than one triangle juxtaposed, and one side of the triangle is located at a portion where said flexible circuit connecting apparatus is connected to said device with a hard case.
8. A flexible circuit connection method, characterized by:
using a flexible circuit connection device as claimed in any one of claims 1 to 7;
fixedly connected to a device having a rigid outer shell.
9. A method for protecting a flexible circuit board for connecting a device having a rigid housing; the method is characterized in that:
firstly, attaching an insulating film component with the thickness adjusted on the surface of the flexible circuit board, and then fixing equipment with a hard shell on the flexible circuit board; the thickness-adjusted insulating film member has a maximum width at a portion where the device having the hard case is connected and a smaller width in a direction away from the device having the hard case.
10. The method of protecting a flexible circuit board according to claim 9, wherein:
the bending strength of the insulating film component with the adjusted thickness is greater than that of the flexible circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010796952.4A CN111935900A (en) | 2020-08-10 | 2020-08-10 | Flexible circuit connecting device, connecting method and method for protecting flexible circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010796952.4A CN111935900A (en) | 2020-08-10 | 2020-08-10 | Flexible circuit connecting device, connecting method and method for protecting flexible circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111935900A true CN111935900A (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010796952.4A Pending CN111935900A (en) | 2020-08-10 | 2020-08-10 | Flexible circuit connecting device, connecting method and method for protecting flexible circuit board |
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| Country | Link |
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| CN (1) | CN111935900A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538934U (en) * | 1991-10-28 | 1993-05-25 | 松下電器産業株式会社 | Printed wiring board |
| US20150373830A1 (en) * | 2014-06-19 | 2015-12-24 | Kabushiki Kaisha Toshiba | Composite substrate including foldable portion |
| CN105340371A (en) * | 2013-02-25 | 2016-02-17 | Mc10股份有限公司 | Strain isolation structures for stretchable electronics |
| US20160192478A1 (en) * | 2014-12-26 | 2016-06-30 | Industrial Technology Research Institute | Flexible electronic device |
| US9723713B1 (en) * | 2014-05-16 | 2017-08-01 | Multek Technologies, Ltd. | Flexible printed circuit board hinge |
| CN210629974U (en) * | 2019-08-21 | 2020-05-26 | 深圳市实锐泰科技有限公司 | Rigid-flex board structure |
| JP2020113685A (en) * | 2019-01-15 | 2020-07-27 | 日本シイエムケイ株式会社 | Rigid flex multilayer printed board |
-
2020
- 2020-08-10 CN CN202010796952.4A patent/CN111935900A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538934U (en) * | 1991-10-28 | 1993-05-25 | 松下電器産業株式会社 | Printed wiring board |
| CN105340371A (en) * | 2013-02-25 | 2016-02-17 | Mc10股份有限公司 | Strain isolation structures for stretchable electronics |
| US9723713B1 (en) * | 2014-05-16 | 2017-08-01 | Multek Technologies, Ltd. | Flexible printed circuit board hinge |
| US20150373830A1 (en) * | 2014-06-19 | 2015-12-24 | Kabushiki Kaisha Toshiba | Composite substrate including foldable portion |
| US20160192478A1 (en) * | 2014-12-26 | 2016-06-30 | Industrial Technology Research Institute | Flexible electronic device |
| JP2020113685A (en) * | 2019-01-15 | 2020-07-27 | 日本シイエムケイ株式会社 | Rigid flex multilayer printed board |
| CN210629974U (en) * | 2019-08-21 | 2020-05-26 | 深圳市实锐泰科技有限公司 | Rigid-flex board structure |
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