TWM570520U - Flex flat cable structure and fixing structure of cable connector and flex flat cable - Google Patents

Abstract

A flexible cable structure includes a plurality of signal transmission lines, a first insulating jacket, a first ground conductor, a conductive shielding layer, and a second insulating jacket. Each of the signal transmission lines includes a first transmission conductor, a first insulation layer, and a second insulation layer. The first insulation layer covers the first transmission conductor, and the second insulation layer covers the first insulation layer. The first insulating jacket covers the plurality of signal transmission lines. The first ground conductor is located on one side of the first insulating jacket for grounding. The conductive shielding layer surrounds the first insulating jacket and the first ground conductor, wherein the first ground conductor contacts the conductive shielding layer. The second insulating jacket surrounds the conductive shielding layer. Thereby, the fixing and shielding effect of the flexible cable structure is improved.

Description

Flexible cable structure and flexible cable electrical connector fixing structure

The present invention relates to a flexible cable structure, and more particularly to a flexible cable structure that can improve EMI.

Flexible 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 automated equipment. Because of its neat arrangement, large transmission capacity, flat structure, compact size, convenient disassembly, and flexibility, it can be easily and flexibly applied to various electronic products as a data transmission cable. Flexible flat cable is especially suitable for a variety of high frequency bending applications, such as the connection of moving parts. In connection, it can be plugged in not only by connectors but also directly on a printed circuit board.

A conventional flexible flat cable includes a plurality of signal lines and ground conductors for conducting electrical signals. In order to avoid the problem of electromagnetic interference (EMI), the conductive shielding layer is surrounded by a plurality of signal lines to form a metal shield, and a grounding conductor is disposed outside the conductive shielding layer to improve the electromagnetic interference resistance. force. However, the grounding conductor disposed outside the conductive shielding layer cannot form stable electrical contact with the conductive shielding layer, and the conductive shielding layer cannot cover the grounding conductor, so the grounding conductor and the conductive shielding layer are easy to form a gap during the processing of the cable, resulting in a gap. The leakage of electromagnetic waves creates EMI problems.

At the same time, the inner side of the conductive shielding layer usually has no material for covering the wire, so that the signal line and the ground line in the conductive shielding layer cannot be kept in a fixed position, which makes it impossible to smoothly align the welding circuit board, which is disadvantageous for automatic introduction, and at the same time It is also easy to cause the welding to be off-line or poorly contacted due to the sway of the wire, which affects the quality of the signal transmission.

In addition, the current flexible cable structure utilizes a conductive shielding layer in the outer casing and the flexible wiring structure to form a shield to avoid EMI. However, there is no shielding between the outer casing and the flexible cable, so that electromagnetic waves leak from the outer casing and the flexible cable, causing EMI to affect the signal transmission quality.

Therefore, how to design a new flexible cable structure, improve the technical problem that the grounding conductor and the conductive shielding layer are easy to form a gap during the processing of the cable, how to fix the position of the wire in the conductive shielding layer, and at the same time form a good continuous conductive shielding. Layers to avoid EMI have become an important issue.

In view of this, it is necessary to provide a flexible cable structure to solve the problem of the gap between the ground conductor of the conventional flexible cable structure and the conductive shielding layer, and to improve the fixing of the conventional flexible cable structure and the poor shielding effect.

The present invention discloses a flexible cable structure including a plurality of signal transmission lines, a first insulating jacket, a first ground conductor, a first adhesive layer, a conductive shielding layer, a second adhesive layer, and a second insulating jacket. Each signal transmission line contains a transmission conductor. The first insulating jacket covers the plurality of signal transmission lines. The first ground conductor is located on one side of the first insulating jacket for grounding. The first adhesive layer surrounds the first insulating jacket and the first ground conductor. The conductive shielding layer surrounds the first adhesive layer. The first ground conductor contacts and is attached to the first insulating jacket and the first adhesive layer. The second adhesive layer surrounds the conductive shielding layer. The second insulating jacket surrounds the second adhesive layer.

According to an embodiment of the present invention, the signal transmission line further includes a first insulating layer covering the transmission conductor.

According to an embodiment of the present invention, the signal transmission line further includes a second insulating layer covering the first insulating layer.

According to an embodiment of the present invention, the flexible cable structure further includes a plurality of grounding wires, wherein the first insulating sheath covers a plurality of the grounding wires, and each of the grounding wires includes a second grounding conductor for grounding.

According to an embodiment of the present invention, each of the ground lines further includes a third insulating layer covering the second ground conductor.

According to an embodiment of the present invention, the second insulating layer has a dielectric constant value greater than a dielectric constant value of the first insulating layer.

According to an embodiment of the present invention, the cross-sectional area of the second ground conductor is greater than the cross-sectional area of the transmission conductor.

According to an embodiment of the present invention, the first insulating layer and the second insulating layer have Different dielectric constant values.

The present invention further discloses a flexible cable electrical connector fixing structure, comprising: an electrical connector and a flexible cable structure. The electrical connector includes a base, a circuit board, a plurality of terminals, and a housing. The circuit board has a plurality of conductive portions and a plurality of connecting portions, and the plurality of conductive portions are electrically connected to the corresponding connecting portions. One end of the plurality of terminals is connected to a plurality of connecting portions. The outer casing is coupled to the base. The flexible cable structure comprises the aforementioned flexible cable structure.

According to an embodiment of the present invention, the electrical connector includes a spacer, the spacer is coupled to the base, and the spacer has an accommodation space. One end of the plurality of terminals passes through a corresponding receiving space and is connected to a plurality of the connecting portions.

According to an embodiment of the present invention, the electrical connector includes an inner mold and a shielding layer. The inner mold is disposed between the outer casing and the flexible cable structure, and is surrounded and fixed to the circuit board. The shielding layer surrounds and is attached to the inner mold, and is electrically connected to the outer casing and the flexible cable structure, so that the shielding layer, the outer casing and the flexible cable structure form a continuous metal shield.

Compared with the prior art, the present embodiment provides a flexible cable structure, which is filled with an insulating material between the conductive shielding layer and the signal transmission line and the grounding wire to fix the position of the signal transmission line and the grounding line, thereby facilitating automation. welding. A second adhesive layer is disposed between the second insulating jacket and the conductive shielding layer, and a first adhesive layer is disposed between the first insulating jacket and the conductive shielding layer for reinforcing the second insulating jacket and the A bonding effect between the conductive shielding layers and between the first insulating jacket and the conductive shielding layer.

In order to make the above content of this creation more obvious and easy to understand, the following is a better implementation. For example, and with the accompanying drawings, a detailed description is as follows:

1‧‧‧Soft cable electrical connector fixing structure

10‧‧‧Electrical connector

12‧‧‧ Pedestal

14‧‧‧ boards

15‧‧‧ spacers

16‧‧‧terminal

18‧‧‧Shell

20‧‧‧Soft cable structure

22‧‧‧ Grounding wire

24‧‧‧Signal transmission line

26‧‧‧Viscosive shielding

27‧‧‧Second grounding conductor

202‧‧‧First insulated jacket

204‧‧‧Second insulation jacket

221‧‧‧First grounding conductor

222‧‧‧Second grounding conductor

224‧‧‧ Third insulation layer

240‧‧‧First transmission conductor

242‧‧‧First insulation

244‧‧‧Second insulation

261‧‧‧First sticky layer

262‧‧‧Second viscous layer

263‧‧‧ Conductive shielding layer

152‧‧‧ accommodating space

142‧‧‧Electrical Department

144‧‧‧Connecting Department

Figure 1 is an exploded view of the fixed structure of the flexible cable electrical connector of the present invention.

Fig. 2 is a perspective view showing the susceptor, the circuit board, the spacer, the plurality of terminals, and the outer casing shown in Fig. 1.

Fig. 3 is a view showing the flexible cable structure of the first embodiment of the present invention.

Fig. 4 is a cross-sectional view of the flexible wiring structure of Fig. 3 taken along the line A-A'.

Fig. 5 is a partially enlarged view of Fig. 4.

Fig. 6 is a view showing a flexible wiring structure of a second embodiment of the present invention.

Figure 7 is a cross-sectional view of the flexible cable structure of Figure 6 taken along line B-B'.

Fig. 8 is a view showing a flexible wiring structure of a third embodiment of the present invention.

Figure 9 is a cross-sectional view of the flexible cable structure of Figure 8 taken along line C-C'.

Fig. 10 is a view showing a flexible wiring structure of a fourth embodiment of the present invention.

Figure 11 is a cross-sectional view of the flexible cable structure of Figure 10 taken along the line D-D'.

Fig. 12 is a view showing a flexible wiring structure of a fifth embodiment of the present invention.

Figure 13 is a cross-sectional view of the flexible cable structure of Figure 12 taken along the line E-E'.

Fig. 14 is a view showing a flexible wiring structure of a sixth embodiment of the present invention.

Figure 15 is a cross-sectional view of the flexible cable structure of Figure 14 taken along the line F-F'.

The implementation, functional features, and advantages of the present embodiments will be further described with reference to the accompanying drawings.

In order to further understand the features, technical means, and specific functions and purposes of the present invention, a more specific embodiment will be listed, followed by a detailed description of the drawings and the drawings.

The following description of the various embodiments is provided to illustrate the specific embodiments in which the present invention may be practiced. Directional terms mentioned in this creation, such as "upper", "lower", "before", "after", "left", "right", "top", "bottom", "horizontal", "vertical", etc. , just refer to the direction of the additional schema. Therefore, the directional terminology used is used to describe and understand the creation, and is not intended to limit the creation.

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

The electrical connector 10 includes a base 12, a circuit board 14, a spacer 15, a plurality of terminals 16, and a housing 18. The spacers 15 are assembled on the base 12, and the spacers 15 have a plurality of accommodating spaces 152. The circuit board 14 has a plurality of conductive portions 142 and a plurality of connecting portions 144. The plurality of conductive portions 142 are electrically connected to the corresponding connecting portions 144. One end of the plurality of terminals 16 passes through the corresponding accommodating space 152 and is connected to the plurality of connecting portions 144. The outer casing 18 is assembled to the base 12.

Please refer to FIG. 2, which is a perspective view of the susceptor 12, the circuit board 14, the spacer 15, the plurality of terminals 16, and the outer casing 18. The flexible cable structure 20 is electrically connected to the conductive portion 142 of the circuit board 14 , and the terminal 16 is electrically connected to the connecting portion 144 of the circuit board 14 , so that the flexible cable structure 20 can be bidirectionally transmitted with the device connected to the terminal 16 or Receive data.

Referring to FIG. 3 and FIG. 4, FIG. 3 illustrates the flexible cable structure 20 of the first embodiment of the present invention. Figure 4 is a flexible cable structure 20 of Figure 3 A section along the line A-A'. The flexible cable structure 20 includes a signal transmission line 24, a viscous shielding layer 26, a first insulating jacket 202, a second insulating jacket 204, and a first ground conductor 221. The signal transmission lines 24 have a circular cross section and are arranged parallel to each other. The first insulating jacket 202 encloses the signal transmission line 24 such that there is no gap between the plurality of signal transmission lines 24 of the flexible cable structure 20 and the first insulating jacket 202 to reduce friction caused by shaking, and the flexible cable structure 20 can also be The various components are positioned to facilitate the soldering of the conductors of the flexible cable structure 20 to the conductive portions 142 on the circuit board 14 using automated equipment. Each signal transmission line 24 includes a transmission conductor 240 for transmitting signals. The first ground conductor 221 is located on one side or different sides of the first insulating jacket 202 for grounding. The second insulating jacket 204 covers the first insulating jacket 202. The adhesive shielding layer 26 is disposed between the first insulating jacket 202 and the second insulating jacket 204 for bonding the first insulating jacket 202 and the second insulating jacket 204. Forming a metal shield.

Please refer to FIG. 5 together, and FIG. 5 is a partial enlarged view of FIG. 4. The viscous shielding layer 26 includes a first viscous layer 261, a second viscous layer 262, and a conductive shielding layer 263. The first adhesive layer 261 surrounds the first insulating outer sleeve 202 and the first grounding conductor 221 , and the first grounding conductor 221 contacts and is attached to the first insulating outer sleeve 202 and the first adhesive layer 261 . The conductive shielding layer 263 surrounds the first adhesive layer 261, and the second adhesive layer 262 surrounds the conductive shielding layer 263. The conductive shielding layer 263 may be aluminum foil, copper foil, other metal foil, metal mesh, metal foil or conductive cloth for forming a metal shield on the signal transmission line 24 to isolate external electrical interference. The second insulating jacket 204 surrounds the second adhesive layer 262. The first adhesive layer 261 and the second adhesive layer 262 may be hot melt adhesive or conductive adhesive.

Referring to Figures 6 and 7, Figure 6 is a flexible cable structure 20 of the second embodiment of the present invention. Figure 7 is a diagram of the flexible cable structure 20 of Figure 6 along the B-B' line. Sectional view. The flexible cable structure 20 includes a signal transmission line 24, a viscous shielding layer 26, a first insulating jacket 202, a second insulating jacket 204, and a first ground conductor 221. The signal transmission lines 24 have a circular cross section and are arranged parallel to each other. The first insulating jacket 202 encloses the signal transmission line 24, so that there is no gap between the grounding wire 22 and the signal transmission line 24 of the flexible cable structure 20 and the first insulating jacket 202, so as to reduce the friction caused by the shaking, and also make the flexible cable. The components of structure 20 are positioned to facilitate the soldering of the conductors of flexible cable structure 20 to conductive portions 142 on circuit board 14 using automated equipment. Each signal transmission line 24 includes a transmission conductor 240 for transmitting signals. The first ground conductor 221 is located on one side or different sides of the first insulating jacket 202 for grounding. The second insulating jacket 204 covers the first insulating jacket 202. The adhesive shielding layer 26 is disposed between the first insulating jacket 202 and the second insulating jacket 204 for bonding the first insulating jacket 202 and the second insulating jacket 204. Forming a metal shield. Different from the first embodiment illustrated in FIG. 4, the flexible cable structure 20 of FIGS. 6 and 7 further includes a plurality of second ground conductors 27, which are used as the grounding wires 22 for grounding. Preferably, the cross-sectional area of the second ground conductor 27 is larger than the cross-sectional area of the transmission conductor 240.

Referring to Figures 8 and 9, Figure 8 is a flexible cable structure 20 of a third embodiment of the present invention. Fig. 9 is a cross-sectional view of the flexible cable structure 20 taken along line C-C' of Fig. 8. The flexible cable structure 20 includes a signal transmission line 24, a viscous shielding layer 26, a first insulating jacket 202, a second insulating jacket 204, and a first ground conductor 221. The signal transmission lines 24 have a circular cross section and are arranged parallel to each other. The first insulating jacket 202 encloses the signal transmission line 24 such that there is no gap between the plurality of signal transmission lines 24 of the flexible cable structure 20 and the first insulating jacket 202 to reduce friction caused by shaking, and the flexible cable structure 20 can also be The components are fixed in position to facilitate the soldering of the conductors of the flexible cable structure 20 to the circuit board 14 by automated equipment. The upper conductive portion 142. Each signal transmission line 24 includes a transmission conductor 240 for transmitting signals. The first ground conductor 221 is located on one side or different sides of the first insulating jacket 202 for grounding. The second insulating jacket 204 covers the first insulating jacket 202. The adhesive shielding layer 26 is disposed between the first insulating jacket 202 and the second insulating jacket 204 for bonding the first insulating jacket 202 and the second insulating jacket 204. Forming a metal shield. Different from the first embodiment illustrated in FIG. 4, each of the signal transmission lines 24 of FIGS. 8 and 9 further includes a first insulating layer 242, and the first insulating layer 242 covers the transmission conductor 240 to form a better insulation effect. .

Referring to Figures 10 and 11, Figure 10 is a flexible cable structure 20 of a fourth embodiment of the present invention. Fig. 11 is a cross-sectional view of the flexible cable structure 20 taken along line D-D' of Fig. 10. Different from the third embodiment shown in FIGS. 8 and 9, the flexible cable structure 20 of FIGS. 10 and 11 further includes a plurality of second ground conductors 27, and the second ground conductor 27 is used as a grounding wire for grounding. . In this embodiment, the cross-sectional area of the transmission conductor 240 and the second ground conductor 27 is different. Preferably, the cross-sectional area of the second ground conductor 27 is larger than the cross-sectional area of the transmission conductor 240.

Referring to Figures 12 and 13, Figure 12 is a flexible cable structure 20 of a fifth embodiment of the present invention. Fig. 13 is a cross-sectional view of the flexible cable structure 20 taken along line E-E' of Fig. 12. Different from the fourth embodiment shown in FIGS. 10 and 11, the flexible cable structure 20 of FIGS. 12 and 13 further includes a plurality of grounding wires 22, each of which includes a second grounding conductor 27 and a third insulating layer. 224. Each ground line 22 is for grounding.

Referring to Figures 14 and 15, Figure 14 is a flexible cable structure 20 of a sixth embodiment of the present invention. Figure 15 is a cross-sectional view of the flexible cable structure 20 taken along line F-F' of Figure 14. Different from the fifth embodiment shown in Figures 12 and 13, the figures 14 and 15 The signal transmission line 24 of the portion of the flexible cable structure 20 includes a first insulating layer 242 and a second insulating layer 244. The first insulating layer 242 covers the transmission conductor 240, and the second insulating layer 244 covers the first insulating layer 242. The signal transmission line 24 is covered by two insulating layers of the first insulating layer 242 and the second insulating layer 244. In the present invention, the first insulating layer 242 and the second insulating layer 244 are respectively composed of two materials having different dielectric constant values, and the third insulating layer 224 covering the second ground conductor 27 may also have different dielectric constant values. The first insulating layer 242 and the second insulating layer 244 are made of a material. Preferably, the second insulating layer 244 has a higher dielectric constant value than the first insulating layer 242. However, this is only an example and is not intended to be limiting and authoring. By adjusting the arrangement or diameter of the grounding wire 22, the signal transmission line 24, or adjusting the dielectric constant value or structure of the first insulating layer 242, the second insulating layer 244, and the third insulating layer 224, the soft row of the creation can be changed. The line connector fixes the impedance value of structure 1.

The material of the first insulating sheath 202, the second insulating sheath 204, the first insulating layer 242, the second insulating layer 244 and the third insulating layer 224 may be polyethylene (polyethylene), polyvinyl chloride (PVC). , Thermoplastic Elastomer (TPE), Thermoplastic Polyurethane (TPU), Thermoplastic rubber (TPR), Thermoplastic Polyolefin (TPO), Polyurethane (PUR), Polypropylene (Polypropylene) , PP), Polyolefins (PO), PVDF (PolyVinyli Dene Fluoride), Ethylene-chlorotrifluororthylene copolymer (ECTFE), ethylene-tetrafluoroethylene (ethylene-tetra-fluoro-ethylene) , ETFE), Teflon Fluorinated ethylene propylene (Teflon FEP), Teflon (Polytetrafluoroethene, PTFE), Teflon or Nylon. The transmission conductor 240, the first ground conductor 221, and the second ground conductor 222 may be extremely thin tinned flat copper wires.

Please refer to Figures 7, 11, 13, and 15, where the subscript corresponding to the ground line is G, and the subscript corresponding to the signal transmission line is S. In the present creation, the arrangement of the grounding line 22 and the signal transmission line 24 can be divided into two types: one is a grounding line and the signal transmission line is alternately arranged, that is, the grounding line 22 - the signal transmission line 24 - the grounding line 22 - the signal transmission line 24 - the ground line 22 Order. The other is that two signal transmission lines are sandwiched between the two ground lines, that is, the grounding line 22 - the signal transmission line 24 - the signal transmission line 24 - the grounding line 22. In this way, the appropriate grounding wire configuration can be selected according to the signal speed or type transmitted by the signal transmission line to ensure the quality of the signal transmission.

Compared with the prior art, the flexible cable structure of the present invention is filled with a first insulating jacket between the conductive shielding layer and the signal transmission line to fix the position of the signal transmission line and the grounding line, thereby facilitating automatic welding. A second adhesive layer is disposed between the second insulating jacket and the conductive shielding layer, and a first adhesive layer is disposed between the first insulating jacket and the conductive shielding layer for reinforcing the second insulating jacket and the A bonding effect between the conductive shielding layers and between the first insulating jacket and the conductive shielding layer.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application.

Claims (10)

A flexible cable structure comprises: a plurality of signal transmission lines arranged in parallel with each other, each signal transmission line comprising: a transmission conductor for transmitting signals; a first insulating jacket covering the plurality of signal transmission lines; a grounding conductor on one side of the first insulating jacket for grounding; a first adhesive layer surrounding the first insulating jacket and the first grounding conductor; and a conductive shielding layer surrounding the first adhesive layer The first ground conductor contacts and is attached to the first insulating jacket and the first adhesive layer; a second adhesive layer surrounds the conductive shielding layer; and a second insulating jacket surrounds the second adhesive Floor. The flexible cable structure of claim 1, wherein the signal transmission line further comprises a first insulating layer covering the transmission conductor. The flexible cable structure of claim 2, wherein the signal transmission line further comprises a second insulating layer covering the first insulating layer. The flexible cable structure of claim 1, further comprising a plurality of grounding wires, wherein the first insulating sheath covers a plurality of the grounding wires, and each of the grounding wires comprises a second grounding conductor for Ground. The flexible cable structure of claim 4, wherein each of the ground wires further comprises a third insulating layer covering the second ground conductor. The flexible cable structure of claim 3, wherein the second insulating layer has a dielectric constant value greater than a dielectric constant value of the first insulating layer. The flexible cable structure of claim 4, wherein the second ground conductor has a cross-sectional area greater than a cross-sectional area of the transmission conductor. The flexible cable structure of claim 3, wherein the first insulating layer and the second insulating layer have different dielectric constant values. A flexible cable electrical connector fixing structure comprises: an electrical connector, comprising: a base; a circuit board having a plurality of conductive portions and a plurality of connecting portions, wherein the plurality of conductive portions are electrically connected correspondingly a connecting portion; a plurality of terminals, one end of the plurality of terminals being connected to the plurality of connecting portions; and a housing coupled to the base; and a flexible cable structure including the patent application scope The flexible cable structure according to any one of the items 1-8, wherein the transmission conductor, or the first ground conductor, or the second ground conductor is connected to the plurality of the conductive portions. The flexible cable electrical connector fixing structure according to claim 9, wherein the electrical connector comprises a spacer, the spacer is assembled on the base, and the spacer has an accommodation space; One end of each terminal passes through a corresponding accommodating space and is connected to a plurality of the connecting portions.