CN206331804U - Flexible flat cable structure and flexible flat cable electric connector fixing structure - Google Patents

Abstract

The utility model discloses a soft flat cable structure, it includes several metal transmission line, several first insulation overcoat, the insulating overcoat of second, the insulating overcoat of third and shields the layer. The metal transmission lines are arranged in parallel and comprise at least one power line and a plurality of signal lines, wherein the power line is used for transmitting power, and the signal lines are used for transmitting data signals. Each first insulating jacket covers one of the metal transmission lines. The second insulating outer sleeve surrounds a plurality of the first insulating outer sleeves. The third insulating jacket coats the plurality of first insulating jackets, and the second insulating jacket coats the third insulating jacket. The shielding layer is used for isolating the second insulating outer sleeve from the third insulating outer sleeve, and comprises an insulating glue film, a first shielding layer and a second shielding layer.

Description

Flexible flat cable structure and flexible flat cable electrical connector fixing structure

【Technical field】

The utility model relates to a flexible flat cable structure, in particular to a flexible flat cable structure for reducing electromagnetic interference.

【Background technique】

Flexible Flat Cable (Flex Flat Cable, FFC) is a new type of data cable. It is made of insulating material and extremely thin tinned flat copper wire, which is pressed by automatic equipment. Due to the characteristics of neat arrangement of wire cores, large transmission capacity, flat structure, small size, convenient disassembly, and flexibility, it can be easily and flexibly applied to various electronic products as data transmission cables. Flexible flat flat cables are especially suitable for various high-frequency bending applications, such as the connection of moving parts. In terms of connection, it can not only be plugged in with a connector, but also directly soldered to a printed circuit board.

The size of electronic products tends to be compact, so the size of cables used in electronic products must also be reduced accordingly. In addition, the data transmission speed of electronic products is moving towards high speed, and the requirements for the high-speed signal transmission quality of transmission lines are also getting higher and higher. In order to improve the quality of transmission lines, it is necessary to reduce the interference between signal lines and improve the electromagnetic interference (Electromagnetic Disturbance) generated during signal transmission. , EMI) problem. Traditional flat cables can reduce interference to adjacent signal lines during high-speed signal transmission by coating the outer side of the signal lines with metal foil or braided metal grid (grid). However, the metal shielding of all the signal lines of the traditional flat cable is only coated with a single layer of metal foil, and the anti-EMI effect is poor. Moreover, in the manufacturing process of the woven metal grid, there is a problem that it is easy to scatter after stripping the outer covering.

Therefore, it is necessary to provide a flexible flat cable that can improve EMI and is reliable and easy to manufacture.

【Content of utility model】

In view of this, the purpose of this utility model is to provide a flexible flat cable structure and a flexible flat cable electrical connector fixing structure to solve the technical problem that the signal line braided metal grid covering of the traditional flat cable is easy to scatter.

The utility model provides a flexible flat cable structure, which comprises several metal transmission lines, several first insulating jackets, a second insulating jacket, a third insulating jacket and a shielding layer. Several metal transmission lines are arranged parallel to each other, including at least one power line and several signal lines. The power line is used to transmit power, and the several signal lines are used to transmit data signals. Each first insulating sheath covers one of the metal transmission lines. The second insulating jacket surrounds the first insulating jackets. The third insulating jacket wraps the first insulating jackets, and the second insulating jacket wraps the third insulating jackets. The shielding layer is used to isolate the second insulating jacket from the third insulating jacket, and the shielding layer includes an insulating glue film, a first shielding layer and a second shielding layer. The insulating adhesive film includes a first surface and a second surface, and the first surface is opposite to the second surface. The first shielding layer is adhered to the first surface of the insulating adhesive film.

According to an embodiment of the present invention, the flexible flat cable structure further includes a ground wire, parallel to the plurality of metal transmission lines, located on one side of the third insulating jacket, and the ground wire is covered by the second insulating jacket.

According to an embodiment of the present invention, the second shielding layer is adhered to the second surface of the insulating adhesive film.

According to an embodiment of the present invention, the first shielding layer is a metal foil, and the second shielding layer is a metal foil, a conductive cloth or a magnetic material layer.

According to an embodiment of the present invention, the second shielding layer is pasted on the first shielding layer.

The utility model further provides a flexible flat cable structure, which includes several metal transmission lines, several first insulating jackets, a second insulating jacket and several shielding layers. Several metal transmission lines are arranged parallel to each other, including at least one power line and several signal lines. The power line is used to transmit power, and several signal lines are used to transmit data signals. Several metal transmission lines are divided into several transmission line groups , each transmission line group includes at least two metal transmission lines. At least two of the metal transmission lines in each transmission line group are covered by a plurality of the first insulating jackets, and the rest of the metal transmission lines in each transmission line group are arranged at one side of the first insulating jackets. The second insulating jacket covers several transmission line groups. The several shielding layers are used to isolate the first insulating jacket and the second insulating jacket, and each shielding layer includes an insulating adhesive film, a first shielding layer and a second shielding layer. The insulating adhesive film includes a first surface and a second surface, and the first surface is opposite to the second surface. The first shielding layer is adhered to the first surface of the insulating adhesive film.

According to an embodiment of the present invention, in each transmission line group, the two first insulating jackets for covering at least two metal transmission lines are in contact with each other.

According to an embodiment of the present invention, the second shielding layer is adhered to the second surface of the insulating adhesive film.

According to an embodiment of the present invention, the first shielding layer is a metal foil, and the second shielding layer is a metal foil, a conductive cloth or a magnetic material layer.

According to an embodiment of the present invention, the second shielding layer is pasted on the first shielding layer.

The utility model further provides a flexible flat cable structure, which includes several metal transmission lines, a first insulating jacket, a second insulating jacket and a shielding layer. Several metal transmission lines are arranged parallel to each other, including at least one power line and several signal lines. The power line is used to transmit power, and the several signal lines are used to transmit data signals. The first insulating jacket covers the plurality of metal transmission lines. The second insulating jacket covers the first insulating jacket. The shielding layer is used to isolate the first insulating jacket from the second insulating jacket, and the shielding layer forms a metal shield for the plurality of metal transmission lines. The shielding layer includes an insulating adhesive film, a first shielding layer and a second shielding layer. The insulating adhesive film includes a first surface and a second surface, and the first surface is opposite to the second surface. The first shielding layer is adhered to the first surface of the insulating adhesive film.

According to an embodiment of the present invention, the flexible flat cable structure further includes a grounding wire, parallel to the plurality of metal transmission lines, located on one side of the first insulating jacket, and the grounding wire is covered by the second insulating jacket.

According to an embodiment of the present invention, the second shielding layer is adhered to the second surface of the insulating adhesive film.

According to an embodiment of the present invention, the first shielding layer is a metal foil, and the second shielding layer is a metal foil, a conductive cloth or a magnetic material layer.

According to an embodiment of the present invention, the second shielding layer is pasted on the first shielding layer.

Compared with the prior art, the flexible flat cable structure and the flexible flat cable electrical connector fixing structure of the embodiment of the present invention surround all signal lines through at least one shielding layer. The shielding layer includes an insulating adhesive film, a first shielding layer and a second shielding layer. The shielding layer has two shielding layers, so it has a better metal shielding effect. In addition, the shielding layer uses the insulating adhesive film as a base material, and different materials are laminated through adhesive to form a composite adhesive film. Therefore, the shielding layer of the present invention is coated with an adhesive film to improve the cable EMI problem, simplify the product structure and reduce the cable manufacturing process.

In order to make the above-mentioned content of the present utility model more obvious and easy to understand, the preferred embodiments are specially cited below, and in conjunction with the attached drawings, the detailed description is as follows:

【Description of drawings】

Fig. 1 is an exploded view of the fixing structure of the flexible flat cable electrical connector of the present invention.

Fig. 2 is a cross-sectional view of the first embodiment of the flexible flat cable structure of the present invention.

Fig. 3 is a partially enlarged view of the first embodiment of the shielding layer of the present invention.

Fig. 4 is a partially enlarged view of the second embodiment of the shielding layer of the present invention.

Fig. 5 is a cross-sectional view of the second embodiment of the flexible flat cable structure of the present invention.

Fig. 6 is a cross-sectional view of the third embodiment of the flexible flat cable structure of the present invention.

The realization of the purpose, functional features and advantages of the embodiments of the utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

【detailed description】

In order to further understand the features, technical means, and achieved specific functions and objectives of the utility model, more specific embodiments are listed, followed by drawings and drawing numbers for detailed description as follows.

The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented. The direction terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "top", "bottom", "horizontal", "vertical" etc. are merely for reference to the directions of the attached drawings. Therefore, the used directional terms are used to illustrate and understand the present invention, but not to limit the present invention.

Please refer to FIG. 1 together. FIG. 1 is an exploded view of the fixing structure 1 of the flexible flat cable electrical connector of the present invention. The flexible flat cable electrical connector fixing structure 1 includes an electrical connector 10 and a flexible flat cable structure 20 . The flexible flat cable structure 20 is inserted into the electrical connector 10 . The electrical connector 10 may be a connector conforming to specifications such as HDMI/USB3.0/USB3.1/Display Port/SATA with a data rate greater than 1 Gb/s.

The electrical connector 10 includes a base 12 , a circuit board 14 , a spacer 15 , terminals 16 and a housing 18 . The spacer 15 is assembled on the base 12 , and the spacer 15 has a plurality of receiving grooves 152 . The circuit board 14 has several conductive parts 142 and several connecting parts 144 , and the several conductive parts 142 are electrically connected to corresponding connecting parts 144 . One ends of the plurality of terminals 16 pass through the corresponding receiving slots 152 and are connected to the plurality of connecting portions 144 . The shell 18 is assembled to the base 12 .

Please refer to FIG. 2 . FIG. 2 is a cross-sectional view of a flexible flat cable structure 20a according to the first embodiment of the present invention. The flexible flat cable structure 20 a includes several metal transmission lines 22 , several first insulating jackets 241 , a second insulating jacket 242 , a third insulating jacket 243 and a shielding layer 26 . Several metal transmission lines 22 are arranged parallel to each other, including at least one power line 222 and several signal lines 224. The power line 222 is used to transmit power, and the signal line 224 is used to transmit data signals. The cross section of the metal transmission line 22 is circular. Each first insulating sheath 241 covers one of the metal transmission lines 22 . The third insulating jacket 243 covers the first insulating jackets 241 , and the second insulating jacket 242 covers the third insulating jacket 243 . The second insulating jacket 242 surrounds the first insulating jackets 241 , and two outer surfaces of the second insulating jacket 242 are provided with embossed patterns 248 . In this embodiment, the grounding wire 221 for grounding is parallel to the plurality of metal transmission lines 22 and located on one side of the third insulating jacket 243 . The ground wire 221 is covered by the second insulating jacket 242 . The shielding layer 26 is used to isolate the second insulating jacket 242 and the third insulating jacket 243 , and the shielding layer 26 forms a metal shield for the plurality of metal transmission lines 22 , and the grounding wire 221 electrically contacts the shielding layer 26 . The metal transmission lines 22 of the flexible flat cable structure 20 protrude from the second insulating jacket 242 and the first insulating jacket 241 . When the flexible flat cable structure 20 a is inserted into the electrical connector 10 , the protruding metal transmission line 22 can electrically contact the corresponding conductive portion 142 of the circuit board 14 . Embossing pattern 248 can be several parallel line patterns, or several curves, or regularly arranged circles, ellipses, triangles, squares, rhombuses, regular hexagonal patterns, etc., and can also be irregularly arranged patterns , or several consecutive bumps. Preferably, an embossed pattern 248 is disposed on the outer surface of the second insulating jacket 242 in this embodiment, and the embossed pattern 248 includes several bending lines 225 that are not parallel to the extending direction B of the several metal transmission lines 22 in the plan view direction A. The several bending lines 225 may be grooves or protrusions formed on the outer surface of the second insulating jacket 242 . The embossed pattern 248 can be directly embossed on the outer surface of the second insulating jacket 242 using automatic lamination equipment.

Please refer to FIG. 3 . FIG. 3 is a partially enlarged view of the first embodiment of the shielding layer 26 of the present invention. The shielding layer 26 includes an insulating film 261 , a first shielding layer 262 and a second shielding layer 264 . The insulating film 261 can be made of polyimide (PI) or polyethylene terephthalate (PET). The insulating adhesive film 261 includes a first surface 2611 and a second surface 2612 , the first surface 2611 is opposite to the second surface 2612 . The first shielding layer 262 is adhered to the first surface 2611 of the insulating film 261 by an adhesive 265 . The second shielding layer 264 is bonded to the second surface 2612 of the insulating film 261 through an adhesive 265 . The first shielding layer 262 is a metal foil, such as aluminum foil. The second shielding layer 264 is a metal foil (such as copper foil), a conductive cloth or a magnetic material layer.

Please refer to FIG. 4 . FIG. 4 is a partially enlarged view of the second embodiment of the shielding layer 26 of the present invention. The shielding layer 26 includes an insulating film 261 , a first shielding layer 262 and a second shielding layer 264 . The insulating film 261 can be made of polyimide (PI) or polyethylene terephthalate (PET). The insulating adhesive film 261 includes a first surface 2611 and a second surface 2612 , the first surface 2611 is opposite to the second surface 2612 . The first shielding layer 262 is adhered to the first surface 2611 of the insulating film 261 by an adhesive 265 . The first shielding layer 262 is a metal foil, such as aluminum foil. The second shielding layer 264 is pasted on the first shielding layer 262 , preferably, the second shielding layer 264 must be a metal film that can be plated on the first shielding layer 262 . Therefore, the second shielding layer 264 can be copper or other metal plating.

The first insulating jacket 241, the second insulating jacket 242 and the third insulating jacket 243 can be polyethylene (polyethylene, PE), polyvinyl chloride (polyvinyl chloride, PVC), thermoplastic elastomer (ThermoplasticElastomer, TPE), thermoplastic polyurethane (Thermoplastic Polyurethane, TPU), thermoplastic rubber (thermoplastic rubber, TPR), thermoplastic polyolefin (Thermoplastic Polyolefin, TPO), polyurethane (Polyurethane, PUR), polypropylene (Polypropylene, PP), polyolefin (Polyolefins, PO), PVDF (PolyVinyliDene Fluoride), ethylene-chlorotrifluoroethylene copolymer (Ethylene-chlorotrifluoroethylene copolymer, ECTFE), ethylene-tetrafluoroethylene copolymer (ethylene-tetra-fluoro-ethylene, ETFE), Teflon polyperfluoroethylene propylene resin (Teflon Fluorinated ethylenepropylene (Teflon FEP), polytetrafluoroethylene (PTFE), Teflon (Teflon) or nylon (Nylon) and other heat-resistant insulating materials. Instead, the metal transmission line 22 may be an extremely thin tinned flat copper wire.

Please refer to FIG. 5 . FIG. 5 is a cross-sectional view of a flexible flat cable structure 20 b according to a second embodiment of the present invention. The flexible flat cable structure 20b includes several transmission line groups 21 , several first insulating jackets 241 and a second insulating jacket 242 . Each transmission line group 21 includes several metal transmission lines 22, and several metal transmission lines 22 are arranged parallel to each other, including at least one power line 222 and several signal lines 224, the power line 222 is used to transmit power, and the signal line 224 is used to transmit data signals . The cross section of the metal transmission line 22 is circular. At least two metal transmission lines 22 of each transmission line group 21 are covered by a plurality of first insulating jackets 241 , and the rest of the metal transmission lines 22 of each transmission line group 21 are disposed beside the first insulating jackets 241 . The second insulating jacket 242 covers the plurality of transmission line groups 21 , and the outer surface of the second insulating jacket 242 is provided with an embossed pattern 248 . The second insulating jacket 242 wraps several first insulating jackets 241 , and the second insulating jacket 242 wraps the remaining metal transmission lines 22 in each transmission line group 21 that are not covered by the first insulating jacket 241 . In each transmission line group 21 , two first insulating jackets 241 for covering at least two metal transmission lines 22 are in contact with each other.

In this embodiment, the grounding wire 221 for grounding is parallel to the plurality of metal transmission lines 22 and located on one side of the first insulating jacket 241 . In this embodiment, each set of transmission line groups 21 includes two metal transmission lines 22 and one ground line 221 . The ground wire 221 is covered by the second insulating jacket 242 . The shielding layer 26 is used to isolate the first insulating jacket 241 and the second insulating jacket 242 , and the shielding layer 26 forms a metal shield for the plurality of metal transmission lines 22 . The structure of the shielding layer 26 is the same as that described in the embodiment in FIG. 3 and FIG. 4 , and will not be repeated here. Each set of transmission line groups 21 may also include more than three metal transmission lines 22 and one ground line 221 . And the metal transmission lines 22 of each transmission line group 21 are covered by the first insulating jacket 241 , and the first insulating jacket 241 of each transmission line group 21 is surrounded by the shielding layer 26 , and the grounding wire 221 is in electrical contact with the shielding layer 26 .

The metal transmission lines 22 of the flexible flat cable structure 20 b protrude from the second insulating jacket 242 and the first insulating jacket 241 . When the flexible flat cable structure 20 b is inserted into the electrical connector 10 , the protruding metal transmission line 22 can electrically contact the corresponding conductive portion 142 of the circuit board 14 . Embossing pattern 248 can be several parallel line patterns, or several curves, or regularly arranged circles, ellipses, triangles, squares, rhombuses, regular hexagonal patterns, etc., and can also be irregularly arranged patterns , or several consecutive bumps. Preferably, an embossed pattern 248 is disposed on the outer surface of the second insulating jacket 242 in this embodiment, and the embossed pattern 248 includes several bending lines 225 that are not parallel to the extending direction B of the several metal transmission lines 22 in the plan view direction A. The several bending lines 225 may be grooves or protrusions formed on the outer surface of the second insulating jacket 242 . The embossed pattern 248 can be directly embossed on the outer surface of the second insulating jacket 242 using automatic lamination equipment.

The first insulating jacket 241 and the second insulating jacket 242 can be polyethylene (polyethylene, PE), polyvinyl chloride (polyvinyl chloride, PVC), thermoplastic elastomer (Thermoplastic Elastomer, TPE), thermoplastic polyurethane (Thermoplastic Polyurethane, TPU), Thermoplastic rubber (thermoplastic rubber, TPR), thermoplastic polyolefin (Thermoplastic Polyolefin, TPO), polyurethane (Polyurethane, PUR), polypropylene (Polypropylene, PP), polyolefin (Polyolefins, PO), PVDF (PolyVinyliDene Fluoride), ethylene- Chlorotrifluoroethylene copolymer (Ethylene-chlorotrifluoroethylene copolymer, ECTFE), ethylene-tetrafluoroethylene copolymer (ethylene-tetra-fluoro-ethylene, ETFE), Teflon polyperfluoroethylene propylene resin (Teflon Fluorinated ethylene propylene, Teflon FEP), polytetrafluoroethylene (Polytetrafluoroethene, PTFE), Teflon (Teflon) or nylon (Nylon) and other heat-resistant insulating materials. Instead, the metal transmission line 22 may be an extremely thin tinned flat copper wire.

Please refer to FIG. 6 . FIG. 6 is a cross-sectional view of a third embodiment of the flexible flat cable structure 20c of the present invention. The flexible flat cable structure 20c includes several metal transmission lines 22 , a first insulating jacket 241 and a second insulating jacket 242 . Several metal transmission lines 22 are arranged parallel to each other, including at least one power line 222 and several signal lines 224. The power line 222 is used to transmit power, and the signal line 224 is used to transmit data signals. The cross section of the metal transmission line 22 is circular. The first insulating jacket 241 covers the metal transmission line 22 . The second insulating jacket 242 surrounds the first insulating jacket 241 , and two outer surfaces of the second insulating jacket 242 are provided with embossed patterns 248 . In this embodiment, the grounding wire 221 for grounding is parallel to the plurality of metal transmission lines 22 and located on one side of the first insulating jacket 241 . The ground wire 221 is covered by the second insulating jacket 242 . The shielding layer 26 is used to isolate the first insulating jacket 241 and the second insulating jacket 242 , and the shielding layer 26 forms a metal shield for the plurality of metal transmission lines 22 , and the grounding wire 221 electrically contacts the shielding layer 26 . The structure of the shielding layer 26 is the same as that described in the embodiment in FIG. 3 and FIG. 4 , and will not be repeated here. Several metal transmission lines 22 of the flexible flat cable structure 20c protrude from the second insulating jacket 242 and the first insulating jacket 241 . When the flexible flat cable structure 20 c is inserted into the electrical connector 10 , the protruding metal transmission line 22 can electrically contact the corresponding conductive portion 142 of the circuit board 14 . Embossing pattern 248 can be several parallel line patterns, or several curves, or regularly arranged circles, ellipses, triangles, squares, rhombuses, regular hexagonal patterns, etc., and can also be irregularly arranged patterns , or several consecutive bumps. Preferably, an embossed pattern 248 is disposed on the outer surface of the second insulating jacket 242 in this embodiment, and the embossed pattern 248 includes several bending lines 225 that are not parallel to the extending direction B of the several metal transmission lines 22 in the plan view direction A. The several bending lines 225 may be grooves or protrusions formed on the outer surface of the second insulating jacket 242 . The embossed pattern 248 can be directly embossed on the outer surface of the second insulating jacket 242 using automatic lamination equipment.

The first insulating jacket 241 and the second insulating jacket 242 can be polyethylene (polyethylene, PE), polyvinyl chloride (polyvinyl chloride, PVC), thermoplastic elastomer (Thermoplastic Elastomer, TPE), thermoplastic polyurethane (Thermoplastic Polyurethane, TPU), Thermoplastic rubber (thermoplastic rubber, TPR), thermoplastic polyolefin (Thermoplastic Polyolefin, TPO), polyurethane (Polyurethane, PUR), polypropylene (Polypropylene, PP), polyolefin (Polyolefins, PO), PVDF (PolyVinyliDene Fluoride), ethylene- Chlorotrifluoroethylene copolymer (Ethylene-chlorotrifluoroethylene copolymer, ECTFE), ethylene-tetrafluoroethylene copolymer (ethylene-tetra-fluoro-ethylene, ETFE), Teflon polyperfluoroethylene propylene resin (Teflon Fluorinated ethylene propylene, Teflon FEP), polytetrafluoroethylene (Polytetrafluoroethene, PTFE), Teflon (Teflon) or nylon (Nylon) and other heat-resistant insulating materials. Instead, the metal transmission line 22 may be an extremely thin tinned flat copper wire.

The flexible flat cable structure and the flexible flat cable electric connector fixing structure of the embodiment of the utility model surround all signal lines through at least one shielding layer. The shielding layer includes an insulating adhesive film, a first shielding layer and a second shielding layer. The shielding layer has two shielding layers, so it has a better metal shielding effect. In addition, the shielding layer uses the insulating adhesive film as a base material, and different materials are laminated through adhesive to form a composite adhesive film. Therefore, the shielding layer of the present invention is coated with an adhesive film to improve the cable EMI problem, simplify the product structure and reduce the cable manufacturing process.

In summary, although the present utility model has been disclosed as above with a preferred embodiment, the preferred embodiment is not intended to limit the present utility model, and those of ordinary skill in the art will not depart from the spirit and scope of the present utility model , all can make various changes and retouching, so the scope of protection of the present utility model is defined by the claims as the criterion.

Claims (16)

1. A flexible flat cable structure, comprising: Several metal transmission lines are arranged parallel to each other, including at least one power line and several signal lines, the power line is used to transmit power, and the several signal lines are used to transmit data signals; a plurality of first insulating jackets, each first insulating jacket covers one of the metal transmission lines; a second insulating jacket surrounding several of the first insulating jackets; A third insulating jacket covering several first insulating jackets, and the second insulating jacket covering the third insulating jacket; characterized in that the flexible flat cable structure includes: A shielding layer for isolating the second insulating jacket and the third insulating jacket, the shielding layer comprising: An insulating adhesive film, including a first surface and a second surface, the first surface is opposite to the second surface; a first shielding layer bonded to the first surface of the insulating adhesive film; and a second shielding layer. 2. The flexible flat cable structure according to claim 1, further comprising: A grounding wire parallel to the plurality of metal transmission lines is located on one side of the third insulating jacket, and the grounding wire is covered by the second insulating jacket. 3. The flexible flat cable structure according to claim 1, wherein the second shielding layer is bonded to the second surface of the insulating film. 4. The flexible flat cable structure according to claim 3, wherein the first shielding layer is a metal foil, and the second shielding layer is a metal foil, a conductive cloth or a magnetic material layer. 5. The flexible flat cable structure as claimed in claim 1, wherein the second shielding layer is bonded on the first shielding layer. 6. A flexible flat cable structure comprising: Several metal transmission lines are arranged parallel to each other, including at least one power line and several signal lines, the power line is used to transmit power, the several signal lines are used to transmit data signals, and the several metal transmission lines are divided into several transmission line groups, Each transmission line group includes at least two metal transmission lines; Several first insulating jackets, at least two of the metal transmission lines of each transmission line group are covered by several of the first insulating jackets, and the remaining metal transmission lines of each transmission line group are arranged on the side of the first insulating jacket; A second insulating jacket covering several transmission line groups; it is characterized in that the flexible flat cable structure includes: Several shielding layers are used to isolate the first insulating jacket and the second insulating jacket, each shielding layer comprising: An insulating adhesive film, including a first surface and a second surface, the first surface is opposite to the second surface; a first shielding layer bonded to the first surface of the insulating adhesive film; and a second shielding layer. 7 . The flexible flat cable structure according to claim 6 , wherein in each transmission line group, two first insulating jackets for covering at least two metal transmission lines are in contact with each other. 8. The flexible flat cable structure according to claim 6, wherein the second shielding layer is bonded to the second surface of the insulating film. 9. The flexible flat cable structure according to claim 8, wherein the first shielding layer is a metal foil, and the second shielding layer is a metal foil, a conductive cloth or a magnetic material layer. 10. The flexible flat cable structure as claimed in claim 6, wherein the second shielding layer is bonded on the first shielding layer. 11. A flexible flat cable structure comprising: Several metal transmission lines are arranged parallel to each other, including at least one power line and several signal lines, the power line is used to transmit power, and the several signal lines are used to transmit data signals; a first insulating jacket covering a plurality of the metal transmission lines; A second insulating jacket covering the first insulating jacket; characterized in that the flexible flat cable structure includes: A shielding layer for isolating the first insulating jacket and the second insulating jacket, the shielding layer comprising: An insulating adhesive film, including a first surface and a second surface, the first surface is opposite to the second surface; a first shielding layer bonded to the first surface of the insulating adhesive film; and a second shielding layer. 12. The flexible flat cable structure according to claim 11, further comprising: A grounding wire is parallel to the plurality of metal transmission lines and located on one side of the first insulating jacket, and the grounding wire is covered by the second insulating jacket. 13. The flexible flat cable structure according to claim 11, wherein the second shielding layer is bonded to the second surface of the insulating adhesive film. 14. The flexible flat cable structure according to claim 13, wherein the first shielding layer is a metal foil, and the second shielding layer is a metal foil, a conductive cloth or a magnetic material layer. 15. The flexible flat cable structure according to claim 11, wherein the second shielding layer is bonded on the first shielding layer. 16. A flexible flat cable electrical connector fixing structure, comprising: An electrical connector comprising: a base; A spacer is assembled on the base, and the spacer has several receiving grooves; A circuit board has several conductive parts and several connecting parts, and the several conductive parts are electrically connected to corresponding connecting parts; a plurality of terminals, one end of the plurality of terminals passes through the corresponding receiving groove and is connected to the plurality of connecting parts; and a shell assembled on the base; and A flexible flat cable structure, characterized in that the flexible flat cable structure comprises the flexible flat cable structure according to any one of claims 1-15, wherein several metal transmission lines are connected to several conductive parts .