FFC flat cable ground wire noise current shunt structure and preparation method thereof

Abstract

This invention discloses an FFC (Flexible Cable Control) grounding wire noise current shunting structure and its preparation method. The structure includes a cable body with several grounding wires arranged on it. The surfaces of the grounding wires are covered with an FFC film, with opposite ends of the grounding wires located outside the FFC film. The grounding wires requiring noise current shunting are exposed from the FFC film, forming a silver paste area on their surface. This silver paste area covers all exposed grounding wires requiring noise current shunting. An outer conductive composite aluminum foil is placed on the silver paste area, and a double-conductive aluminum foil is placed on top of the outer conductive composite aluminum foil. This invention first uses a laser method to expose the grounding wires requiring noise current shunting, then applies silver paste, attaches the outer conductive composite aluminum foil and the double-conductive aluminum foil. Applying silver paste increases the conductivity of the grounding wires, and attaching the outer conductive composite aluminum foil provides good signal shielding. Grounding is then performed after attaching the double-conductive aluminum foil, achieving the purpose of noise current shunting. The shunting effect is good for any grounding wire current.

Description

Technical Field

[0001] This invention belongs to the field of FFC cable technology, specifically relating to an FFC cable grounding wire noise current shunt structure and its preparation method. Background Technology

[0002] FFC (Flexible Flat Cable) is a new type of data cable made by laminating PET insulation material and extremely thin tinned flat copper wire. It is widely used due to its advantages such as flexibility, easy bending and folding, small size, thinness, simple connection, convenient disassembly, and easy electromagnetic shielding (EMI). However, current FFC cables have poor noise current shunting performance in the grounding wire and the operation process is relatively cumbersome. Therefore, designing a new noise current shunting structure for the grounding wire of FFC cables is of significant practical importance. Summary of the Invention

[0003] To address the technical problems existing in the prior art, the present invention aims to provide an FFC cable grounding wire noise current shunt structure and its preparation method.

[0004] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows:

[0005] An FFC cable grounding noise current shunting structure includes a cable body with several grounding wires arranged on it. The surface of each grounding wire is covered with an FFC film, and the two ends of each grounding wire are located outside the FFC film. The grounding wires that need to shunt noise current are exposed from the FFC film and form a silver paste area on their surface. The silver paste area can completely cover all the exposed grounding wires that need to shunt noise current. An outer conductive composite aluminum foil is disposed on the silver paste area, and a double conductive aluminum foil is disposed on the outer conductive composite aluminum foil. The outer conductive composite aluminum foil and the double conductive aluminum foil work together to completely shield the silver paste area.

[0006] Furthermore, the external conductive composite aluminum foil overlaps with both the silver paste region and the FFC film.

[0007] Furthermore, the dual-conductive aluminum foil completely covers the silver paste area and partially covers the external conductive composite aluminum foil.

[0008] Furthermore, the ribbon cable body has symmetrical reinforcing plates arranged at opposite ends on the side away from the FFC film. The reinforcing plates include a first reinforcing plate and a second reinforcing plate connected in sequence. The first reinforcing plate is tightly attached to the ribbon cable body, and the second reinforcing plate is at a certain angle to the ribbon cable body.

[0009] Furthermore, the sum of the thicknesses of the cable body, the reinforcing plate, and the grounding wire is 0.3 ± 0.03 mm.

[0010] Furthermore, the ratio of the length of the FFC film to the length of the grounding wire is (0.94-0.96):1, and the thickness of the FFC film is 43-60μm.

[0011] Furthermore, the thickness of the external conductive composite aluminum foil is 0.06-0.45 mm.

[0012] Furthermore, the thickness of the dual-conducting aluminum foil is 0.06-0.1 mm.

[0013] Furthermore, several grounding wires are arranged at equal intervals on the cable body.

[0014] A method for fabricating a noise current shunt structure for an FFC cable grounding wire includes the following steps:

[0015] First, the FFC film on the surface of the grounding wire that needs to be shunted for noise current is removed by laser method. Then, the exposed grounding wire that needs to be shunted for noise current is coated with silver paste to form a silver paste area with a sufficient area.

[0016] An external conductive composite aluminum foil is attached to the silver paste area, wherein the external conductive composite aluminum foil at least covers a portion of the silver paste area.

[0017] By attaching a double-conductive aluminum foil to the outer conductive composite aluminum foil for grounding, the noise current is diverted. The double-conductive aluminum foil can completely cover the silver paste area and the covered portion of the outer conductive composite aluminum foil.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention discloses an FFC cable grounding noise current shunting structure and its preparation method. The shunting structure includes a cable body with several grounding wires arranged on the cable body. The surface of the grounding wires is covered with an FFC film, and the two ends of the grounding wires are located outside the FFC film. The grounding wires that need to shunt grounding noise current are exposed from the FFC film and a silver paste area is formed on the surface. An outer conductive composite aluminum foil is provided on the silver paste area, and a double conductive aluminum foil is provided on the outer conductive composite aluminum foil. In this invention, the FFC film is first removed using a laser to expose the grounding wires that require noise current shunting. Then, silver paste is applied, and external conductive composite aluminum foil and double-conductive aluminum foil are attached. The noise waves, electromagnetic waves, and EMI absorbed by the external conductive composite aluminum foil reach the grounding wires via the double-conductive aluminum foil and silver paste area, then pass through the grounding terminals of the connector, and finally reach the grounding copper foil layer in the PCB board. Because the noise waves, electromagnetic waves, and EMI absorbed by the external conductive composite aluminum foil reach several grounding wires via the double-conductive aluminum foil and silver paste area, the signal pair directly below the external conductive composite aluminum foil is in a very low noise interference state, reducing attenuation and crosstalk, and ensuring signal wave speed and signal integrity. This invention increases the conductivity of the exposed grounding wires that require noise grounding current shunting by applying silver paste, and achieves good signal shielding by attaching external conductive composite aluminum foil. After attaching the double-conductive aluminum foil, grounding is performed to achieve the purpose of noise current shunting, and the current shunting effect on any grounding wire is good. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a front view of the present invention;

[0022] Figure 3 For the present invention Figure 1 Enlarged view of the local structure at point A;

[0023] Figure 4 This is a magnified schematic diagram of a portion of the structure of the present invention without the double-conductive aluminum foil attached;

[0024] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the local structure when the silver paste area is formed but the external conductive composite aluminum foil and the double conductive aluminum foil are not attached;

[0025] Figure 6 For the present invention Figure 3 Enlarged schematic diagram of the local structure before the formation of silver paste area, the attachment of external conductive composite aluminum foil, and the double conductive aluminum foil. Detailed Implementation

[0026] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0027] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0028] like Figure 1-6 As shown, an FFC cable grounding noise current shunting structure includes a cable body 1, on which several grounding wires 2 are arranged at equal intervals. The surface of the grounding wires 2 is covered with an FFC film 3 with a thickness of 43-60μm. The two ends of the grounding wires 2 are located outside the FFC film 3. The length ratio of the FFC film 3 to the length of the grounding wire 2 is (0.94-0.96):1. The grounding wires 2 that need to be grounded for noise current shunting are exposed from the FFC film 3 by laser and silver paste is applied to their surface to form a silver paste area 4. The area of ​​the silver paste area 4 is large enough to completely cover all the exposed grounding wires that need to be grounded for noise current shunting. The grounding wire 2 is beneficial to improving the current shunting effect. An external conductive composite aluminum foil 5 is set on the upper surface of the silver paste area 4, which is beneficial to shielding signal interference. The external conductive composite aluminum foil 5 partially overlaps with the silver paste area 4 and the FFC film 3. The FFC film 3 is not completely covered by the external conductive composite aluminum foil 5 and can be partially exposed. The thickness of the external conductive composite aluminum foil 5 is 0.06-0.45mm. A double conductive aluminum foil 6 is attached to the upper surface of the external conductive composite aluminum foil 5. The double conductive aluminum foil 6 completely covers the silver paste area 4 and the covered part of the external conductive composite aluminum foil 5. The thickness of the double conductive aluminum foil 6 is 0.06-0.1mm. By designing the double conductive aluminum foil 6 for grounding, the noise current of the grounding wire is shunted.

[0029] The ribbon cable body 1 has symmetrical reinforcing plates 7 on both ends opposite to each other on the side away from the FFC film 3. The reinforcing plates 7 include a first reinforcing plate 8 and a second reinforcing plate 9 connected in sequence. The first reinforcing plate 8 is tightly attached to the ribbon cable body 1, and the second reinforcing plate 9 is at a certain angle (20-40°) to the ribbon cable body 1. The sum of the thicknesses of the ribbon cable body 1, the reinforcing plates 7 and the grounding wire 2 is 0.3±0.03mm.

[0030] A method for fabricating a noise current shunt structure for an FFC cable grounding wire includes the following steps:

[0031] First, the FFC film 3 on the surface of the grounding wire 2 that needs to be grounded for noise current shunting is removed by laser method. Then, the exposed grounding wire 2 that needs to be grounded for noise current shunting is formed by brushing silver paste to form a silver paste area 4 with a sufficient area.

[0032] An external conductive composite aluminum foil 5 is attached to the silver paste area 4, and the external conductive composite aluminum foil 5 covers at least part of the silver paste area 4.

[0033] A double-conductive aluminum foil 6 is attached to the outer conductive composite aluminum foil 5 for grounding, so as to divert the noise current of the grounding wire. The double-conductive aluminum foil 6 can completely cover the silver paste area 4 and the covered part of the outer conductive composite aluminum foil 5.

[0034] Example 1

[0035] like Figure 1-6 As shown, an FFC cable grounding noise current shunting structure includes a cable body 1, on which several grounding wires 2 are arranged at equal intervals. The surface of each grounding wire 2 is covered with a 43μm thick FFC film 3. The opposite ends of the grounding wires 2 are located outside the FFC film 3. The length ratio of the FFC film 3 to the length of the grounding wire 2 is 0.94:1. The grounding wires 2 that need to have their grounding noise current shunted are exposed from the FFC film 3 by laser, and silver paste is applied to their surface to form a silver paste area 4. The area of ​​the silver paste area 4 is large enough to completely cover all the exposed grounding wires that need to have their grounding noise current shunted. The grounding wire 2 is beneficial to improving the current shunting effect. An external conductive composite aluminum foil 5 is set on the upper surface of the silver paste area 4, which is beneficial to shielding signal interference. The external conductive composite aluminum foil 5 partially overlaps with the silver paste area 4 and the FFC film 3. The FFC film 3 is not completely covered by the external conductive composite aluminum foil 5 and can be partially exposed. The thickness of the external conductive composite aluminum foil 5 is 0.18mm. A double conductive aluminum foil 6 is attached to the upper surface of the external conductive composite aluminum foil 5. The double conductive aluminum foil 6 completely covers the silver paste area 4 and the covered part of the external conductive composite aluminum foil 5. The thickness of the double conductive aluminum foil 6 is 0.08mm. By designing the double conductive aluminum foil 6 for grounding, the noise current of the grounding wire is shunted.

[0036] The ribbon cable body 1 has symmetrical reinforcing plates 7 on both ends opposite to each other on the side away from the FFC film 3. The reinforcing plates 7 include a first reinforcing plate 8 and a second reinforcing plate 9 connected in sequence. The first reinforcing plate 8 is tightly attached to the ribbon cable body 1, and the second reinforcing plate 9 is at a certain angle (30°) to the ribbon cable body 1. The sum of the thicknesses of the ribbon cable body 1, the reinforcing plates 7 and the grounding wire 2 is 0.3 mm.

[0037] A method for fabricating a noise current shunt structure for an FFC cable grounding wire includes the following steps:

[0038] First, the FFC film 3 on the surface of the grounding wire 2 that needs to be grounded for noise current shunting is removed by laser method. Then, the exposed grounding wire 2 that needs to be grounded for noise current shunting is formed by brushing silver paste to form a silver paste area 4 with a sufficient area.

[0039] An external conductive composite aluminum foil 5 is attached to the silver paste area 4, and the external conductive composite aluminum foil 5 covers at least part of the silver paste area 4.

[0040] A double-conductive aluminum foil 6 is attached to the outer conductive composite aluminum foil 5 for grounding, so as to divert the noise current of the grounding wire. The double-conductive aluminum foil 6 can completely cover the silver paste area 4 and the covered part of the outer conductive composite aluminum foil 5.

[0041] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0042] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A noise current shunt structure for an FFC cable grounding wire, comprising a cable body, wherein a plurality of grounding wires are arranged at equal intervals on the cable body, characterized in that, The surface of the grounding wire is covered with an FFC film. The two opposite ends of the grounding wire are located outside the FFC film. Multiple grounding wires that need to be shunted for noise current are exposed from the FFC film and form a silver paste area on the surface. The silver paste area can completely cover all the exposed multiple grounding wires that need to be shunted for noise current. An outer conductive composite aluminum foil is set on the silver paste area. A double conductive aluminum foil is set on the outer conductive composite aluminum foil. The outer conductive composite aluminum foil and the double conductive aluminum foil work together to completely block the silver paste area. The external conductive composite aluminum foil overlaps with the silver paste area and the FFC film respectively; The dual-conductive aluminum foil completely covers the silver paste area and also covers the external conductive composite aluminum foil. The method for preparing the noise current shunt structure of the FFC cable grounding wire includes the following steps: First, the FFC film on the surface of the grounding wire that needs to be shunted for noise current is removed by laser method. Then, the exposed grounding wires that need to be shunted for noise current are coated with silver paste to form a silver paste area with a sufficient area. An external conductive composite aluminum foil is attached to the silver paste area, wherein the external conductive composite aluminum foil at least covers a portion of the silver paste area. By attaching a double-conductive aluminum foil to the outer conductive composite aluminum foil for grounding, the noise current is diverted. The double-conductive aluminum foil can completely cover the silver paste area and the covered portion of the outer conductive composite aluminum foil.

2. The noise current shunt structure for the grounding wire of an FFC cable according to claim 1, characterized in that, The ribbon cable body has symmetrical reinforcing plates at both ends opposite each other on the side away from the FFC film. The reinforcing plates include a first reinforcing plate and a second reinforcing plate connected in sequence. The first reinforcing plate is tightly attached to the ribbon cable body, and the second reinforcing plate is at a certain angle to the ribbon cable body.

3. The noise current shunt structure for the grounding wire of an FFC cable according to claim 2, characterized in that, The sum of the thicknesses of the cable body, reinforcing plate, and grounding wire is 0.3 ± 0.03 mm.

4. The noise current shunt structure for the grounding wire of an FFC cable according to claim 1, characterized in that, The length ratio of the FFC film to the grounding wire is (0.94-0.96):1, and the thickness of the FFC film is 43-60µm.

5. The noise current shunt structure for the grounding wire of an FFC cable according to claim 1, characterized in that, The thickness of the external conductive composite aluminum foil is 0.06-0.45 mm.

6. The noise current shunt structure for the grounding wire of an FFC cable according to claim 1, characterized in that, The thickness of the double-conducting aluminum foil is 0.06-0.1 mm.

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