TWM578477U - Long-strip high frequency flexible flat cable - Google Patents

Abstract

A strip-shaped high-frequency flexible flat cable includes a wire group, a first insulating layer, a second insulating layer, a hollow region, at least one second grounding wire, and a shielding layer. The wire set has at least one signal wire and at least one first ground wire. The wire group is adhered and fixed between the first insulating layer and the second insulating layer along a longitudinal direction; the hollow region penetrates the second insulating layer along a transverse direction, and the transverse direction is perpendicular to the longitudinal direction, at least one a grounding conductor is exposed to the hollowed out area; at least one second grounding conductor is correspondingly aligned along the longitudinal direction to the at least one first grounding conductor, wherein the at least one second grounding conductor has a non-buried section and a buried section, The buried section is bently connected to the non-buried section; the buried section is fixedly placed in the hollowed out area and abuts against the first grounding conductor, and the non-buried section is isolated from the first grounding conductor; the shielding layer is in contact with the second Non-buried section of the grounding conductor.

Description

Long strip high frequency flexible flat cable

The present invention relates to a flat cable structure, and more particularly to a long strip type high frequency flexible flat cable which can be used as a flexible flat cable or other data transmission cable.

Flexible cable is commonly used as a connection cable (Cable) applied between various boards to transmit data. The utility model has the advantages of softness, random bending and folding, thin thickness, small volume, simple connection and convenient disassembly. The flexible cable can be further divided into a flexible flat cable (FFC) and a flexible printed circuit cable (Flexible Printed Circuit Cable).

Flexible flat cables can also be used in a variety of high frequency transmission connections, 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.

The flexible flat cable mainly comprises a plurality of flat conductors arranged in parallel with each other in one arrangement plane and an insulating layer laminated on the flat conductor. In order to avoid the problem of electromagnetic interference (EMI) and noise, a metal layer is usually provided on the periphery of the insulating layer as a shielding layer, and some flat conductors are electrically connected to the shielding layer for grounding.

However, the existing flexible flat cable has better characteristics in high-speed transmission than ordinary high-speed cables (such as coaxial cable). If it extends beyond a certain length, it is easy to cause crosstalk between signal pairs, and most of the solutions cannot be used. Production automation; for example, disclosed in U.S. Patent Publication No. 5,250,127, the transmission line or The line width and line spacing of the grounding wire should not be too small, which is not conducive to the development of high-frequency flexible flat cable in a longer length.

The present embodiment is to provide an elongated high-frequency flexible flat cable which can solve the crosstalk problem in the long cable, and can make the high-frequency flexible flat cable have a long length.

The present embodiment is to provide an elongated high-frequency flexible flat cable, which is also convenient for automatic production.

In order to achieve the above, an elongated high-frequency flexible flat cable provided by one embodiment of the present invention includes a wire group, a first insulating layer, a second insulating layer, a hollow region, and at least one Two grounding conductors, a laterally insulating sheet, and a shielding layer. The wire set has at least one signal wire and at least one first ground wire. The wire group is adhered and fixed between the first insulating layer and the second insulating layer along a longitudinal direction, and the first insulating layer is attached to the second insulating layer. The hollow region penetrates the second insulating layer along a transverse direction, the transverse direction is perpendicular to the longitudinal direction, and at least one of the first ground wires is exposed to the hollow region. The at least one second grounding wire is correspondingly aligned with the at least one first grounding conductor along the longitudinal direction, wherein at least one of the second grounding conductors has a non-buried section and a buried section, The buried section is bently connected to the non-buried section. The buried section is fixedly disposed in the hollowed out area and abuts the first grounding conductor, and the non-buried section is isolated from the first grounding conductor. The laterally-insulating insulating sheet is placed in the hollow region, and is attached to one side of the buried portion opposite to the first grounding conductor. The shielding layer is in contact with the non-buried section of the second grounding conductor.

The beneficial effect of the present invention may be that the long-shaped high-frequency flexible flat cable provided by the present embodiment can solve the crosstalk problem in the long cable, and the high-frequency flexible flat cable can have a long length. And convenient for automatic production.

To enable a better understanding of the features and technical content of this creation, please see below The detailed description of the present invention and the accompanying drawings are merely for the purpose of illustration and description.

1‧‧‧Flexible flat cable

10‧‧‧Wire set

S‧‧‧ signal wire

G1‧‧‧First grounding conductor

21‧‧‧First insulation

22‧‧‧Second insulation

23‧‧‧ Third insulation layer

E‧‧‧镂空区

G2‧‧‧Second grounding conductor

G21‧‧‧ non-buried section

G22‧‧‧buried section

G23‧‧‧Docking section

31‧‧‧Horizontal lower insulation sheet

32‧‧‧Transverse insulation sheet

50‧‧‧ Strengthening board

60‧‧‧Plug-in stiffener

80‧‧‧Shield

L1‧‧‧ length

W, W1, W2, W5‧‧‧ width

H1, H2, H3‧‧ ‧ layers

H5‧‧‧ outer layer

Fig. 1 is a perspective view of the elongated high-frequency flexible flat cable of the present invention.

2 is another perspective view of the elongated high-frequency flexible flat cable of the present invention.

Fig. 3 is an exploded perspective view of the elongated high-frequency flexible flat cable of the present invention.

4 is another exploded perspective view of the elongated high-frequency flexible flat cable of the present invention.

Fig. 5 is a partially enlarged cross-sectional exploded view of the elongated high-frequency flexible flat cable of the present invention.

Fig. 6 is a partial perspective assembled view of the elongated high-frequency flexible flat cable of the present invention.

Fig. 7 is a sectional sectional view showing a part of a long strip-shaped high-frequency flexible flat cable of the present invention.

For the sake of convenience, the same or equivalent elements of the various embodiments shown in the drawings have been identified with the same reference numerals. The specific terminology is used in the following description for convenience only and is not a limitation. The words "left", "right", "front", "back", "up" and "down" specify the direction in the referenced drawing. Words "forward", "forward", "forward", "internal", "inward", "inward", "outside", "outward", "outward", "upward", " Upward, Downward, and Downward refer to directions toward and away from the geometric center of the object being referenced and its designated portion, respectively.

Please refer to Figure 1 to Figure 4. 1 and 2 are perspective views of the elongated high-frequency flexible flat cable of the present invention. 3 and 4 are exploded perspective views of the elongated high-frequency flexible flat cable of the present invention. The present invention provides a long strip type high frequency flexible flat cable 1, or simply a flexible flat cable 1, which comprises a wire group 10, a first insulating layer 21, a second insulating layer 22, a hollowed out area E, and more. A second grounding conductor G2 and a shielding layer 80.

The wire group 10 has a plurality of signal wires S and a plurality of first ground wires G1. The number of signal wires S and the first ground wire G1 is required according to the flexible flat cable 1 The number can be at least one. In this embodiment, the wire groups 10 are arranged on the same plane and are flat, for example, tin-plated flat copper wires, but the creation is not limited thereto. The wire group 10 of the present embodiment has nine first grounding conductors G1, and two signal conductors S are disposed between any two first grounding conductors G1. However, the arrangement of the wire set 10 of the present creation is not limited thereto.

The first insulating layer 21 and the second insulating layer 22 are made of an insulating material, and may be, for example, a PET (polyethylene terephthalate) film. The wire group 10 is adhered and fixed between the second insulating layer 22 and the first insulating layer 21 along a longitudinal direction. In the present embodiment, the longitudinal direction refers to the extending direction of the flexible flat cable 1 or the wire group 10, that is, the y-axis direction as shown in FIGS. 3 and 4. The second insulating layer 22 may be attached to the first insulating layer 21 by a glue (not shown).

One of the features of this embodiment is that a hollowed out region E is formed in the insulating material of the coated wire group 10. The hollow region E penetrates at least the second insulating layer 22 along a transverse direction. In the embodiment, the hollow region E also penetrates the first insulating layer 21 along the transverse direction. The above-mentioned "transverse direction" means perpendicular to the above-mentioned "longitudinal direction", in other words, the transverse direction is a direction perpendicular to the wire group 10. The first grounding conductor G1 is exposed to the hollowed out area E by the hollowed out area E. However, the present creation is not limited thereto, and the hollowed out area E may only extend through the second insulating layer 22 to expose the first grounding conductor G1.

In addition, in the manufacturing process, the creation process may be a process of rolling and stretching the first insulating layer 21 and the second insulating layer 22, and first forming a hole having a width larger than the hollow area E along the transverse direction, and clamping the wire set. After 10, the cut portion is further formed according to the required width of the first insulating layer 21 and the second insulating layer 22 to form the cutout portion E.

The plurality of second grounding conductors G2 of the present embodiment are all flat in shape, and may be, for example, tin-plated flat copper wires. The number of the second grounding conductors G2 is preferably corresponding to the number of the first grounding conductors G1, and may be at least one. The width of the second grounding conductor G2 is the same as the width of the first grounding conductor G1. However, this creation is not limited to this. Multiple The two grounding conductors G2 are correspondingly aligned with the plurality of first grounding conductors G1 along the longitudinal direction. Another feature of this embodiment is that each of the second grounding conductors G2 has a non-buried section G21 and a buried section G22, and the buried section G22 is bently connected to the non-buried section G21. In other words, please refer to FIG. 5, which is a partially enlarged exploded cross-sectional view of the elongated high-frequency flexible flat cable of the present invention. The buried section G22 and the non-buried section G21 are parallel to each other but are located on different planes. The buried section G22 is fixedly disposed in the hollow area E and abuts against the first grounding wire G1. The non-submerged section G21 is isolated from the first grounding conductor G1. In this embodiment, the non-submerged section G21 of the first grounding conductor G1 and the second grounding conductor G2 is separated by the second insulating layer 22. The first grounding conductor G1 and the non-submerged section G21 of the second grounding conductor G2 face each other and extend in parallel along the longitudinal direction.

As shown in FIG. 5, the length L1 of the buried portion G22 of the second grounding conductor G2 of the present embodiment along the longitudinal direction is substantially equal to the width W of the hollowed-out region E along the longitudinal direction. More specifically, in order to more reliably make the buried section G22 of the second grounding conductor G2 stably contact the portion of the first grounding conductor G1 exposed to the hollow area E, the length L1 of the buried section G22 is equal to or greater than the second grounding conductor. The width of G2 itself, "the width of itself" refers to the width along the traverse direction. In a possible embodiment, the length L1 of the buried section G22 is 3 to 5 times the width of the second grounding conductor G2.

According to the above configuration, in the manufacturing process, the first grounding conductor G1 and the second grounding conductor G2 are in contact with each other in the hollowed-out area E by the pressing process, and are more stable in contact with each other, and are convenient for automatic production. Different from the prior art, it is necessary to additionally perforate the insulating layer, and then the outer grounding wire contacts the grounding wire in the wire layer in a partial tearing manner.

The shielding layer 80 is coated on the outermost periphery of the flexible flat cable 1. In this embodiment, the shielding layer 80 may have shielding properties, such as a metal foil, or coated with a conductive silver paste, or Anisotropic Conductive Film (ACF). The shielding layer 80 is preferably also in contact with the non-buried section G21 of the second grounding conductor G2 to provide an electromagnetic shielding function. Guided by heterosexuality For example, the electric glue can be a limited current that can only flow in the longitudinal direction and cannot flow in the transverse direction.

Please refer to FIG. 3 to FIG. 6. FIG. 6 is a partial perspective assembled view of the elongated high-frequency flexible flat cable of the present invention. The embodiment may further include a third insulating layer 23, and the non-buried portion G21 of the plurality of second grounding wires G2 is attached to a surface of the third insulating layer 23 (the top surface shown in FIG. 5) The other surface of the third insulating layer 23 (the bottom surface shown in FIG. 5) is attached to the second insulating layer 22. The hollowed out region E also penetrates the third insulating layer 23 along the transverse direction; wherein the non-buried portion G21 of the second grounding conductor G2 is placed in the shielding layer 80 and the third insulating layer Between layers 23. This type of design can be used for the automatic production process of this creation. For example, the automatic production machine has multiple layers of rollers for simultaneous operation. The wire set 10 is adhered and fixed between the partially hollowed second insulating layer 22 and the first insulating layer 21 by a rolling bonding process of a generally flexible flat wire. Finally, the second grounding conductor G2 is directly pressed and pressed against the first grounding conductor G1, and the partially hollowed second insulating layer 22 is adhered to the partially hollowed third insulating layer 23 through the adhesive layer H3. However, the above is only an example of a viable automated production of the present creation, and the automated production method of the creation is not limited thereto.

In this embodiment, the flexible flat cable 1 is further reinforced, and further includes a lateral lower insulating sheet 31 and a lateral upper insulating sheet 32. The lateral lower insulating sheet 31 and the lateral upper insulating sheet 32 are placed in the hollow region. Within E. The laterally upper insulating sheet 32 is placed in the hollowed-out area E, and is attached to one side of the buried section G22 opposite to the first grounding conductor G1. The top surface of the insulating sheet 32 is flush with the top surface of the third insulating layer 23. The buried section G22 of the second grounding conductor G2 and a portion of the first grounding conductor G1 are sandwiched between the lateral lower insulating sheet 31 and the lateral upper insulating sheet 32. The lateral lower insulating sheet 31 and the laterally upper insulating sheet 32 may be bonded and fixed by the adhesive layers H1 and H2, respectively. In other words, the lateral lower insulating sheet 31 and the laterally upper insulating sheet 32 are located opposite to each other on the upper and lower sides of the buried section G22 and the first grounding conductor G1. The width of the lateral lower insulating sheet 31 is substantially equal to the width of the laterally insulating sheet 32. Horizontal insulation The thickness of the sheet 32 is slightly larger than the thickness of the third insulating layer 23.

As shown in FIG. 5, in the present embodiment, the width W1 of the lateral lower insulating sheet 31 along the longitudinal direction and the width W2 of the lateral upper insulating sheet 32 along the longitudinal direction are smaller than the hollowed out The width W of the region E along the longitudinal direction. The above structure can provide a flexible space for the flexible flat cable 1 to be bent at both sides of the hollowed area E.

Referring to FIG. 3 to FIG. 5 again, the elongated high-frequency flexible flat cable 1 of the present embodiment may further include a reinforcing plate 50 covering the buried ground of the second grounding conductor G2. Above the segment G22. The reinforcing plate 50 can be attached to the laterally insulating sheet 32 by an outer rubber layer H5 and attached to a portion of the top surface of the third insulating layer 23 across the hollow region E. The function of the reinforcing plate 50 is to prevent the flexible flat cable 1 from being peeled off from the first grounding wire G1 of the second grounding wire G2 when the hollowed-out area E is excessively bent. The material of the reinforcing plate 50 may be, for example, Polyimide (PI), polyethylene terephthalate (PET), Epoxy Glass Cloth (or glass fiber board). ...Wait. The outer layer H5 may be, for example, a pressure sensitive adhesive (PSA), or a thermal set (thermal set) plastic or the like.

Specifically, as shown in FIG. 5, the width W5 of the reinforcing plate 50 along the longitudinal direction is greater than the width W of the hollowed-out area E along the longitudinal direction, and both sides of the reinforcing plate 50 The non-submerged section G21 is attached to the second grounding conductor G2, respectively.

As shown in FIG. 7, FIG. 7 is a partial sectional combination view of the elongated high-frequency flexible flat cable of the present invention. The long-side high-frequency flexible flat cable 1 of the present embodiment is covered with a shielding layer 80 at the outermost periphery, and the shielding layer 80 can provide an electromagnetic shielding function to avoid interference, which is advantageous as a high-frequency transmission line. The shielding layer 80 covers the non-submerged section G21 of the second grounding conductor G2, the outer side of the first insulating layer 21, and the reinforcing plate 50.

Please refer to FIG. 3, FIG. 4 and FIG. 6, the long-shaped high-frequency flexible flat cable of the embodiment. Each of the two ends of the 1 forms a contact area for electrically connecting to the electronic device. The flexible flat cable 1 further includes a pair of plug reinforcing plates 60 disposed in the contact area, wherein both ends of the wire group 10 extend beyond the first insulating layer 21 and the second insulating layer 22, the second Each of the two ends of the grounding wire G2 is bent to form a plugging segment G23, and the plugging segment G23 is located outside the first insulating layer 21 and the second insulating layer 22 and correspondingly contacts the first A portion of the grounding conductor G1 that protrudes; the pair of plug reinforcing plates 60 are attached to the plugging section G23 of the second grounding conductor G2. The material of the plug reinforcing plate 60 may be the same material as the reinforcing plate 50 described above.

It should be noted that the number of the hollow areas E between the contact areas of the two ends of the strip-shaped high-frequency flexible flat cable 1 of the present embodiment may be one or more, and the number of the hollow areas E may be added according to the length. This creation facilitates the extension of the high-frequency flexible flat cable 1 to a longer length, and still solves the crosstalk problem.

In summary, the beneficial effect of the present invention may be that the elongated high-frequency flexible flat cable 1 provided by the present embodiment makes the first grounding conductor G1 and the second grounding conductor G2 in the hollowed-out area E and contacts each other. It is more stable and convenient for automatic production.

The above description is only a preferred and feasible embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Therefore, any equivalent technical changes made by using the present specification and the contents of the schema are included in the scope of protection of the present creation. .

Claims (10)

An elongated high-frequency flexible flat cable includes: a wire group having at least one signal wire and at least one first ground wire; a first insulating layer; a second insulating layer, the wire The group is adhered and fixed between the first insulating layer and the second insulating layer along a longitudinal direction, the first insulating layer is attached to the second insulating layer; a hollow region, the hollow The region penetrates the second insulating layer along a transverse direction, the transverse direction is perpendicular to the longitudinal direction, at least one of the first grounding conductors is exposed to the hollowed out region; at least one second grounding conductor, at least one The second grounding conductor is correspondingly aligned with the at least one first grounding conductor along the longitudinal direction, wherein at least one of the second grounding conductors has a non-buried section and a buried section, The buried section is bently connected to the non-buried section; the buried section is fixedly disposed in the hollowed out area and abuts the first grounding conductor, the non-buried section and the first a grounding conductor is isolated; a laterally insulating sheet, said laterally a rim sheet is disposed in the cutout region, attached to one side of the buried portion opposite to the first grounding conductor; and a shielding layer, the shielding layer contacting the second grounding conductor Said non-buried section. The elongated high-frequency flexible flat cable according to claim 1, wherein the wire groups are arranged on the same plane and are flat. The elongated high-frequency flexible flat cable according to claim 1, wherein a length of the buried portion of the second grounding conductor along the longitudinal direction is substantially equal to the hollowed-out region along the longitudinal direction The width of the long direction, the length of the buried section is equal to or greater than the width of the second grounding conductor itself. The strip-shaped high-frequency flexible flat cable according to claim 1, further comprising a third insulating layer, wherein the non-buried portion of the second grounding wire is attached to a surface of the third insulating layer The other surface of the third insulating layer is attached to the second insulating layer, and the hollow region penetrates the third insulating layer along the transverse direction; wherein the non-the second ground wire A buried section is interposed between the shielding layer and the third insulating layer. The strip-shaped high-frequency flexible flat cable according to claim 4, further comprising a lateral lower insulating sheet, wherein the hollow region penetrates the first insulating layer along the transverse direction, the lateral lower insulating sheet And disposed in the hollow region, the buried portion of the second grounding conductor and a portion of the first grounding conductor are clamped between the lateral lower insulating sheet and the lateral upper insulating sheet. The elongated high-frequency flexible flat cable according to claim 5, wherein a width of the lateral lower insulating sheet and the lateral upper insulating sheet along the longitudinal direction is smaller than the hollowed portion along the longitudinal direction The width of the long direction. The elongated high-frequency flexible flat cable according to claim 6, further comprising a reinforcing plate attached to the lateral upper insulating sheet and a partial top surface of the third insulating layer, A reinforcing plate covers the buried portion of the second grounding wire. The elongated high-frequency flexible flat cable according to claim 7, wherein a width of the reinforcing plate along the longitudinal direction is greater than a width of the hollow region along the longitudinal direction, the reinforcing plate The two sides are respectively attached to the non-buried section of the second grounding conductor. The elongated high-frequency flexible flat cable according to claim 7, wherein the shielding layer covers the non-buried portion of the second grounding conductor, the outer side of the first insulating layer, and the Reinforcing plate. The strip-shaped high-frequency flexible flat cable according to claim 1, further comprising a pair of plug-in reinforcing plates, wherein both ends of the wire group extend beyond the first insulating layer and the second insulating layer, The two ends of the second grounding wire are bent and extended Forming a plugging segment, the plugging segment is located outside the first insulating layer and the second insulating layer and correspondingly contacting the first grounding wire; the pair of plug reinforcing plates are attached to the Said plug section of the second ground conductor.