transmission line

Abstract

The utility model relates to cable technical field, specifically disclose a transmission line, the transmission line includes conductor layer, insulating layer, impedance adjusting layer and protective layer, wherein, insulating layer is located at the outside of conductor layer, impedance adjusting layer is located at the side of insulating layer away from conductor layer, the length direction of protective layer is wrapped in the outer periphery of conductor layer, insulating layer and impedance adjusting layer around conductor layer, and the width of protective layer is all greater than the width of conductor layer, insulating layer and impedance adjusting layer. Through the arrangement of protective layer, make transmission line in around the length direction of self circumference side all obtain effective protection, avoid the influence that water produces to internal impedance adjusting layer, thereby guarantee the adjusting performance of impedance adjusting layer, guarantee the quality of transmission line, avoid receiving electromagnetic interference, improve the use experience of user.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a transmission line. Background Technology

[0002] FFC (Flexible Flat Cable) is a type of flexible flat cable. Using this type of cable can greatly reduce production costs, improve production efficiency, and reduce the spacing and volume between electronic products and cables. Therefore, it has a wide range of applications and is widely used in the connection between the print head of various printers and the motherboard, as well as in the signal transmission and connection of products such as plotters, scanners, copiers, audio equipment, LCD TVs, fax machines, and various DVD players.

[0003] The outermost layer of existing ribbon cables is generally made of copper for impedance regulation. When in use, copper is easily affected by water and undergoes a chemical reaction, which affects the impedance regulation function, reduces the quality of the ribbon cable, makes it more susceptible to electromagnetic interference, and results in a poor user experience.

[0004] Therefore, it is urgent to study a transmission line to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a transmission line that solves the problem in the prior art where the impedance adjustment layer is affected by water, causing a chemical reaction that affects the quality of the cable.

[0006] To achieve the above objectives, one embodiment of this utility model adopts the following technical solution:

[0007] Conductor layer;

[0008] An insulating layer is disposed on the outside of the conductor layer;

[0009] An impedance adjustment layer is disposed on the side of the insulating layer away from the conductor layer;

[0010] A protective layer is wrapped around the outer periphery of the conductor layer, the insulating layer, and the impedance adjustment layer along the length direction of the conductor layer, and the width of the protective layer is greater than the width of the conductor layer, the insulating layer, and the impedance adjustment layer.

[0011] In some embodiments of a transmission line, the protective layer includes a first connecting layer and two protective films. The first connecting layer is in a covering shape and is sleeved on the outer periphery of the conductor layer, the insulating layer and the impedance adjustment layer. Along the height direction of the cross section of the transmission line, the two protective films are respectively attached to the upper and lower sides of the first connecting layer.

[0012] In some embodiments of a transmission line, the first connecting layer is made of polyester hot melt adhesive; and / or,

[0013] The protective film is a PET film, a PRT film, or a PI film.

[0014] In some embodiments of a transmission line, along the length of the transmission line, the end of the first connecting layer is provided with a sealing portion, the sealing portion having a connecting hole through which the conductor layer extends.

[0015] In some embodiments of a transmission line, the insulating layer includes a second connecting layer and two first films. The second connecting layer is in a covering shape and is sleeved on the outer periphery of the conductor layer. Along the height direction of the cross section of the transmission line, the two first films are respectively attached to the upper and lower sides of the protective layer.

[0016] In some embodiments of a transmission line, the insulating layer further includes two second films, each of which mates with one of the first films, and the two first films are located between the two second films. The first films and their corresponding second films are bonded together by polyurethane adhesive.

[0017] In some embodiments of a transmission line, the impedance adjustment layer comprises aluminum foil Mylar, the width of which is greater than or equal to the width of the conductor layer along the width direction of the cross-section of the transmission line.

[0018] In some embodiments of a transmission line, the impedance adjustment layer includes at least two aluminum foil Mylars, which are respectively disposed on both sides of the conductor layer along the height direction of the cross-section of the transmission line.

[0019] In some embodiments of a transmission line, the conductor layer, the insulating layer, the impedance regulating layer, and the protective layer are thermoformed.

[0020] In some embodiments of a transmission line, the conductor layer includes a transmission body made of copper.

[0021] This utility model has at least the following beneficial effects:

[0022] This invention provides an embodiment of a transmission line, comprising a conductor layer, an insulation layer, an impedance adjustment layer, and a protective layer. The insulation layer is disposed outside the conductor layer; the impedance adjustment layer is disposed on the side of the insulation layer away from the conductor layer; the protective layer wraps around the conductor layer, insulation layer, and impedance adjustment layer along the length of the conductor layer, and the width of the protective layer is greater than the widths of the conductor layer, insulation layer, and impedance adjustment layer. Through the arrangement of the protective layer, the transmission line is effectively protected along its entire length, preventing water from affecting the internal impedance adjustment layer, thereby ensuring the adjustment performance of the impedance adjustment layer, guaranteeing the quality of the transmission line, preventing electromagnetic interference, and improving the user experience. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the transmission line structure in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the transmission line in an embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the transmission line in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of the transmission line in an embodiment of the present invention, with a sealing part.

[0028] In the picture:

[0029] 100. Conductor layer;

[0030] 200, Insulating layer; 210, Second connecting layer; 220, First membrane; 230, Polyurethane adhesive; 240, Second membrane;

[0031] 300, Impedance adjustment layer;

[0032] 400, Protective layer; 410, First connecting layer; 411, Sealing part; 420, Protective membrane. Detailed Implementation

[0033] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0034] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0035] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0036] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0037] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0038] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0039] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0040] like Figures 1 to 4 As shown, this embodiment provides a transmission line for use in the main line of new energy vehicles. It is a high-temperature resistant transmission signal line, also known as an FFC (Flexible Flat Cable) line. The transmission line includes a conductor layer 100, an insulation layer 200, an impedance adjustment layer 300, and a protective layer 400. The insulation layer 200 is located on the outside of the conductor layer 100; the impedance adjustment layer 300 is located on the side of the insulation layer 200 away from the conductor layer 100; and the protective layer 400 wraps around the conductor layer 100, the insulation layer 200, and the impedance adjustment layer 300 along their length. The width of the protective layer 400 is greater than the widths of the conductor layer 100, the insulation layer 200, and the impedance adjustment layer 300. By setting the protective layer 400 around the impedance adjustment layer 300, the transmission line is effectively protected along its length, preventing moisture from affecting the internal impedance adjustment layer 300. This ensures the adjustment performance of the impedance adjustment layer 300, protects the transmission line from electromagnetic interference, and improves the user experience.

[0041] The protective layer 400 includes a first connecting layer 410 and two protective films 420. The first connecting layer 410 is in a covering shape and is sleeved on the outer periphery of the conductor layer 100, the insulating layer 200, and the impedance adjustment layer 300. Along the height direction of the cross-section of the transmission line, the two protective films 420 are respectively attached to the upper and lower sides of the first connecting layer 410. Figure 2 As shown. The first connecting layer 410 is made of polyester hot melt adhesive. The first connecting layer 410 is formed by curing polyester hot melt adhesive. The outer periphery of the first connecting layer 410 is encapsulated, and the inner periphery is attached to the internal components.

[0042] In some embodiments, the protective film 420 can be a PET film, a PRT film, or a PI film, which is resistant to high temperatures (-40℃ to 150℃) and has good resistance to mechanical stress. The combination of PET film, PRT film, or PI film with polyester hot melt adhesive enables the protective layer 400 to have IP67 waterproof and dustproof capabilities.

[0043] In some embodiments, the insulating layer 200 includes a second connecting layer 210 and two first films 220. The second connecting layer 210 is in a covering shape and extends along the length direction of the conductor layer 100. The second connecting layer 210 is sleeved on the outer periphery of the conductor layer 100. Along the height direction of the cross-section of the transmission line, the two first films 220 are respectively attached to the upper and lower sides of the second connecting layer 210. The material of the second connecting layer 210 is polyolefin adhesive (PO adhesive). The insulating layer 200 also includes two second films 240, which respectively cooperate with the two first films 220, and the two first films 220 are located between the two second films 240. The first films 220 and their corresponding second films 240 are bonded together by polyurethane adhesive 230. This arrangement helps to suppress high-frequency signal loss and reduce dielectric constant fluctuations. Both the first films 220 and the second films 240 are PET films.

[0044] The impedance adjustment layer 300 includes aluminum foil Mylar. Along the width direction of the transmission line's cross-section, the width L1 of the aluminum foil Mylar is greater than or equal to the width L2 of the conductor layer 100 to provide better shielding capabilities. Signal impedance is adjusted through electromagnetic shielding and thickness optimization to match the requirements of the automotive system. Specifically, along the width direction of the transmission line's cross-section, the width L1 of the aluminum foil Mylar is less than the width L3 of the first film 220. The width L1 of the aluminum foil Mylar is equal to the width of the second film 240.

[0045] Further, the impedance adjustment layer 300 includes at least two aluminum foil Mylars, which are respectively disposed on both sides of the conductor layer 100 along the height direction of the cross-section of the transmission line. In some embodiments, the impedance adjustment layer 300 includes four aluminum foil Mylars, with two layers of aluminum foil Mylars on each side of the conductor layer 100, and the two aluminum foil Mylars on the same side are bonded together by polyurethane.

[0046] In particular, along the width direction of the cross-section of the transmission line, the widths of the two aluminum foil Mylars are the same, and both are greater than the width of the conductor layer 100.

[0047] To improve the structural stability of the transmission line, in some embodiments, the conductor layer 100, insulation layer 200, impedance adjustment layer 300, and protective layer 400 are thermoformed. This arrangement ensures that the conductor layer 100, insulation layer 200, impedance adjustment layer 300, and protective layer 400 are tightly bonded together. The adhesive properties of PO adhesive, polyurethane adhesive 230, and polyester hot melt adhesive effectively prevent water from entering the protective layer 400 and insulation layer 200 while maintaining insulation between the conductor layer 100 and impedance adjustment layer 300. Finally, the thermoforming process prevents relative misalignment of the conductor layer 100, insulation layer 200, impedance adjustment layer 300, and protective layer 400 when the transmission line is bent, avoiding relative friction and extending the service life of the transmission line.

[0048] To ensure the signal transmission performance of the conductor layer 100, in some embodiments, the conductor layer 100 includes a transmission body made of copper. Copper has excellent conductivity, which helps to achieve low-resistance signal transmission. In some embodiments, to improve the stability of the conductor layer 100, the conductor layer 100 further includes a tin layer disposed on the periphery of the transmission body. Specifically, tin is plated on the outer side of the transmission body. Since tin is a metal with high chemical stability, plating it on the copper surface can form a dense protective film, isolating the copper from contact with air, moisture, and other corrosive substances, effectively preventing oxidation and corrosion of the copper, and maintaining the good conductivity of the conductor. In this embodiment, the thickness of the conductor layer 100 is 0.05 mm to 0.5 mm. It should be noted that the thickness direction of the conductor layer 100 is the height direction of the cross-section of the transmission line.

[0049] At least one end of the transmission line along the length of the conductor layer 100 is provided with a connecting portion, and the conductor layer 100 within the connecting portion is exposed to facilitate electrical connection with other structures. The conductor layer 100 within the connecting portion is soldered to a PCB or a connector.

[0050] In this embodiment, after tin plating on the outer side of the conductor layer 100, the tin plating layer can significantly improve the solderability of the copper conductor surface during the soldering process. Tin has a low melting point (approximately 232°C), and can melt quickly and spread evenly on the surface of the conductor layer 100 during soldering, forming a strong metallurgical bond with the solder (usually a tin-lead alloy or lead-free tin alloy), reducing problems such as cold solder joints and false solder joints.

[0051] In some embodiments, along the length of the transmission line, the first connecting layer 410 has sealing portions 411 at both ends, and the sealing portions 411 have connecting holes. The shape of the connecting holes is the same as that of the conductor layer 100, and the conductor layer 100 extends through the connecting holes, thus connecting... Figure 4 As shown, the sealing portion 411 seals the insulating layer 200 and the impedance adjustment layer 300. In other embodiments, the ends of the insulating layer 200 and the impedance adjustment layer 300 are exposed.

[0052] In other embodiments, the conductor layer 100 within the connector is connected to the drawer-type connector, and adhesive is applied to the end of the drawer-type connector for waterproofing. In some embodiments, notches may be left at both ends of the insulating layer 200 for bonding. Figure 3 As shown, a reinforcing plate (not shown) is placed to support the conductor layer 100.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A transmission line, characterized in that, include: Conductor layer; An insulating layer is disposed on the outside of the conductor layer; An impedance adjustment layer is disposed on the side of the insulating layer away from the conductor layer; A protective layer is wrapped around the outer periphery of the conductor layer, the insulating layer, and the impedance adjustment layer along the length direction of the conductor layer, and the width of the protective layer is greater than the width of the conductor layer, the insulating layer, and the impedance adjustment layer.

2. The transmission line according to claim 1, characterized in that, The protective layer includes a first connecting layer and two protective films. The first connecting layer is in a covering shape and is sleeved on the outer periphery of the conductor layer, the insulating layer and the impedance adjustment layer. Along the height direction of the cross section of the transmission line, the two protective films are respectively attached to the upper and lower sides of the first connecting layer.

3. The transmission line according to claim 2, characterized in that, The first connecting layer is made of polyester hot melt adhesive; and / or, The protective film is a PET film, a PRT film, or a PI film.

4. The transmission line according to claim 2, characterized in that, Along the length of the transmission line, the end of the first connecting layer is provided with a sealing part, the sealing part having a connecting hole, and the conductor layer passing through the connecting hole.

5. The transmission line according to claim 1, characterized in that, The insulating layer includes a second connecting layer and two first films. The second connecting layer is in a covering shape and is sleeved on the outer periphery of the conductor layer. Along the height direction of the cross section of the transmission line, the two first films are respectively attached to the upper and lower sides of the protective layer.

6. The transmission line according to claim 5, characterized in that, The insulating layer further includes two second films, which respectively cooperate with two first films, and the two first films are located between the two second films. The first films and the corresponding second films are bonded together by polyurethane adhesive.

7. The transmission line according to any one of claims 1-6, characterized in that, The impedance adjustment layer comprises aluminum foil Mylar, and the width of the aluminum foil Mylar is greater than or equal to the width of the conductor layer along the width direction of the cross-section of the transmission line.

8. The transmission line according to claim 7, characterized in that, The impedance adjustment layer includes at least two aluminum foil Mylars, which are respectively disposed on both sides of the conductor layer along the height direction of the cross-section of the transmission line.

9. The transmission line according to any one of claims 1-6, characterized in that, The conductor layer, the insulating layer, the impedance adjustment layer, and the protective layer are hot-pressed together.

10. The transmission line according to any one of claims 1-6, characterized in that, The conductor layer includes a transport body, which is made of copper.

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