TW201832249A - Ribbon Cable - Google Patents

Abstract

The present invention relates to a ribbon cable. The ribbon cable includes adjacent first and second wires. Each of the first wire and the second wire has a conductive core at the center position thereof and a coating layer enclosing the conductive core. The conductive core is made of copper material, which electrical conductivity is greater than or equal to 50%. The coating layer contains a first coating layer enclosing the conductive core and a second coating layer outside the first coating layer. The ribbon cable also includes an external coating layer enclosing the first and second wires.

Description

Flat cable

The invention relates to a flat cable, in particular to a flat cable with better electrical conductivity.

In the 3C industry, transmission cables can serve as a medium for electrical connection between two electronic devices and can stably perform desired signal transmission operations. Therefore, transmission cables are commonly applied to various electronic devices. Among them, the transmission cable connected with USB, HDMI, DVI, Displayport and other interfaces has the advantages of high transmission rate, long distance, high quality, etc., and is popular among the public, and the number of uses is also increasing. The transmission cable has a plurality of metal wires inside, and the metal wires are externally covered with an insulating layer to avoid short circuit between the metal wires.

However, with the development of computer technology, the transmission speed of electronic products such as computer hard disk and motherboard is getting faster and faster, and the transmission frequency is getting higher and higher. In the field of high frequency and ultra high frequency data transmission, the transmission cable is conductive. Performance stability is also important to prevent loss of electronic product data under the influence of the external environment. The conductors of conventional transmission cables are mostly made of brass, and the electrical conductivity is not ideal.

In view of this, it is indeed necessary to further improve the conventional flat cable to solve the above problems.

It is an object of the present invention to provide a flat cable whose conductor is made of a copper material having a conductivity of 50% or more, which satisfies the requirements of electrical conductivity.

To achieve the above object, the present invention provides a flat cable. The flat cable includes a first wire and a second wire disposed side by side and adjacent to each other, and the first wire and the second wire respectively have a conductor at a central position and a cladding layer covering the periphery of the conductor; the foregoing conductor is electrically conductive The coating is made of a copper material having a rate of 50% or more, and the coating layer includes a first cladding layer covering the periphery of the conductor and a second cladding layer covering the periphery of the first cladding layer, and the flat cable is further The coating includes covering the outer side of the first wire and the second wire at the same time.

As a further improvement of the present invention, the aforementioned conductor is made of a copper alloy having a resistance of less than 361 Ω/Km.

As a further improvement of the present invention, the aforementioned conductor is made of a copper alloy containing more than 98% of copper.

As a further improvement of the present invention, the aforementioned conductor is made of a copper alloy having a conductivity of more than 90%.

As a further improvement of the present invention, the aforementioned conductor is made of a high-conductivity copper alloy.

As a further improvement of the present invention, the aforementioned conductor is made of red copper having a conductivity of 100%.

As a further improvement of the present invention, the flat cable further includes a third wire disposed side by side with the first wire and the second wire, the third wire being disposed adjacent to the first wire or the second wire, and also having a central position And a conductor covering the periphery of the conductor, the outer cladding layer also covering the outer side of the third wire.

As a further improvement of the present invention, the first wire and the second wire constitute a differential signal pair, and the third wire is a ground wire.

As a further improvement of the present invention, a center-to-center spacing of the third wire and the adjacent first wire or the second wire is the same as a center-to-center spacing of the first wire and the second wire.

As a further improvement of the present invention, the centers of the first wire, the second wire, and the third wire are arranged on the same straight line.

Compared with the prior art, the flat cable of the present invention uses a copper material having a conductivity of 50% or more as a conductor of the wire, so that the flat cable has better electrical conductivity and can meet the requirements of electrical conductivity.

Referring to the first and second figures, a preferred embodiment of the flat cable 100 of the present invention is shown. The foregoing flat cable 100 includes at least one wire group 1 including the first wire 11 and the second wire 12 which are arranged side by side and adjacent to each other.

The aforementioned flat cable 100 further includes a third wire 2 disposed side by side with the aforementioned first wire 11 and second wire 12. The aforementioned third wire 2 is disposed adjacent to the first wire 11 or the second wire 12. The first wire 11 and the second wire 12 constitute a differential signal pair for transmitting a high frequency signal; the third wire 2 is a ground wire, which can be used to suppress signal interference of the differential signal to the side. The centers of the first wire 11, the second wire 12, and the third wire 2 are arranged on the same straight line, so that the overall shape of the flat cable 100 is flat, and the cross-section of the flat cable 100 is in the left and right and up and down directions. The upper structure is symmetrical.

In the embodiment, the flat cable 100 includes the differential signal pair in which the plurality of grounding wires 2 are spaced apart from each other, and the differential signal pairs are arranged side by side. The differential signal pair and the grounding conductor 2 are designed to be spaced apart from each other, so that the grounding conductor 2 can isolate two adjacent differential signal pairs to prevent mutual interference.

The aforementioned first wire 11, second wire 12 and third wire 2 respectively have a conductor 13 at a central position and a cladding layer covering the periphery of the conductor 13. The conductor 13 is made of a copper material having a conductivity of 50% or more. Specifically, the foregoing conductor 13 is made of a copper alloy having a resistance of less than 361 Ω/Km; the aforementioned conductor 13 is made of a copper alloy containing more than 98% of copper; and the aforementioned conductor 13 is made of a copper alloy having a conductivity of more than 90%.

It should be noted that the conductivity in this specification is based on the International Annealed Copper Standard (IACS).

In the present embodiment, the copper material is a high-conductivity copper alloy, the conductivity of the high-conductivity copper alloy is 99% or more, and the heat conductivity coefficient of the high-conductivity copper alloy is 0.927-0.935 Cal/cm 2 /cm/sec/° C.

Specifically, the high-conductivity copper alloy is red copper having a conductivity of 100%, and the conductor 13 is designed to be made of red copper having a conductivity of 100%, so that conductivity and thermal conductivity are excellent, and the plasticity is extremely high. Good, and can meet the above requirements of resistance, copper content and conductivity in the subsequent detection process.

The cladding layers of the first wire 11 and the second wire 12 respectively include a first cladding layer 14 coated on the periphery of the conductor 13 and a second cladding layer 15 coated on the periphery of the first cladding layer 14. In the present invention, the dielectric constant of the first cladding layer 14 is lower than the dielectric constant of the second cladding layer 15. Specifically, the first cladding layer 14 is made of an insulating material having a dielectric constant of 2.1 to 2.4, so as to provide a better signal transmission environment of the conductor 13, reducing the propagation delay of the signal, and reducing the crosstalk between the signals to ensure the crosstalk between the signals. High-speed and efficient transmission of signals reduces signal attenuation.

The second cladding layer 15 is disposed to have a relatively high dielectric constant. Specifically, the absorption layer is made of an absorbing material that absorbs electromagnetic waves, thereby absorbing the externally radiated electromagnetic waves by the absorbing layer 15 and effectively The external electromagnetic interference is suppressed, and the conductor 13 is effectively isolated from the outside to ensure high-frequency and ultra-high frequency signal transmission; in addition, the absorbing layer 15 has the properties of light weight, temperature resistance, moisture resistance, corrosion resistance, etc., and is effective The inner conductor 13 is protected to extend the service life of the flat cable 100 of the present invention.

In the present embodiment, since the third wire 2 is provided as a grounding wire, the diameter of the conductor 13 can be set to be different from the diameter of the conductor 13 of the first wire 11 and the second wire 12, that is, the foregoing. The diameter of the conductor 13 of the grounding conductor 2 can be adjusted according to the impedance matching of the differential signal, and can be larger or smaller than the diameter of the conductor 13 of the first conductor 11 and the second conductor 12; on the other hand, the grounding conductor 2 can be The cladding layer is provided only as a layer, and the cladding layer is made of an insulating material to insulate the conductor 13 of the grounding conductor 2 from the conductor 13 of the adjacent first conductor 11 or the second conductor 12.

The foregoing flat cable 100 further includes a cover layer 3 which is simultaneously coated on the outside of the aforementioned first wire 11, second wire 12 and third wire 2 for relative positioning and protection. In the present embodiment, the outer covering layer 3 is made of a material having good weather resistance and fatigue resistance, such as a thermoplastic elastomer TPE (Thermoplastic Elastomer) material, to the inner first wire 11 and the second wire. The 12 and third conductors 2 form better protection to increase the useful life of the flat cable 100 of the present invention. Of course, in other embodiments, the outer cover layer 3 may also be made of a PE material or other materials.

The dielectric constant of the second cladding layer 15 and the dielectric constant of the outer cladding layer 3 are small, which does not affect the overall dielectric constant of the flat cable 100 of the present invention, and ensures high-frequency signal transmission.

In the present invention, the center-to-center spacing of the third wire 2 and the adjacent first wire 11 or second wire 12 is the same as the center-to-center spacing of the first wire 11 and the second wire 12. The outer diameters of the conductors 13 of the first wire 11 and the second wire 12 are both disposed within the range of 28 to 31 American wire gauge (AWG); wherein, when the outer diameter of the conductor 13 is 28 AWG, the first wire 11 and the second wire are The center distance of 12 is set to 0.51 mm to 0.75 mm; when the outer diameter of the conductor 13 is 29 AWG, the center distance of the first wire 11 and the second wire 12 is set to 0.38 mm to 0.75 mm; when the outer diameter of the conductor 13 is 30 to At 31 AWG, the center-to-center spacing of the aforementioned first wire 11 and second wire 12 is set to be 0.38 mm to 0.62 mm.

By the outer diameter of the conductor 13 and the corresponding center-to-center spacing of the first wire 11 and the second wire 12, the differential impedance between the first wire 11 and the second wire 12 can be effectively reduced, and the coupling effect is enhanced to ensure Long-distance transmission of high-frequency signals.

In summary, the conductor 13 of the flat cable 100 of the present invention is made of a copper material having a conductivity of 50% or more (specifically, red copper), so that the flat cable 100 has good electrical conductivity and can satisfy the electrical conductivity. Performance requirements.

It is to be understood that the equivalents of the invention are intended to be included within the scope of the invention as claimed.

100‧‧‧flat cable
1‧‧‧Wire set
11‧‧‧First wire
12‧‧‧Second wire
13‧‧‧Conductor
14‧‧‧First cladding
15‧‧‧Second cladding, absorbing layer
2‧‧‧ Third wire, grounding wire
3‧‧‧Overcoat

The first figure is a perspective view of a preferred embodiment of a flat cable of the present invention. The second figure is a schematic cross-sectional view of the flat cable shown in the first figure.

Claims (10)

A flat cable comprising a first wire and a second wire arranged side by side and adjacent to each other, the first wire and the second wire respectively having a conductor at a central position and a cladding layer covering the periphery of the conductor; wherein The conductor is made of a copper material having a conductivity of 50% or more, and the cladding layer includes a first cladding layer covering the periphery of the conductor and a second cladding layer covering the periphery of the first cladding layer, respectively. The cable further includes a cladding layer that is simultaneously coated on the outer side of the first wire and the second wire. The flat cable of claim 1, wherein the conductor is made of a copper alloy having a resistance of less than 361 Ω/Km. The flat cable of claim 1, wherein the conductor is made of a copper alloy having a copper content of more than 98%. The flat cable of claim 1, wherein the conductor is made of a copper alloy having a conductivity of more than 90%. The flat cable of claim 1, wherein the conductor is made of a high-conductivity copper alloy. The flat cable of claim 5, wherein the conductor is made of red copper having a conductivity of 100%. The flat cable according to claim 1, wherein the flat cable further includes a third wire disposed alongside the first wire and the second wire, and the third wire is adjacent to the first wire or the second wire Provided, and also having a conductor at a central position and a cladding layer covering the periphery of the conductor, the outer cladding layer also covering the outer side of the third conductor. The flat cable of claim 7, wherein the first wire and the second wire constitute a differential signal pair, and the third wire is a ground wire. The flat cable of claim 7, wherein a center-to-center spacing of the third wire and the adjacent first wire or the second wire is the same as a center-to-center spacing of the first wire and the second wire. The flat cable according to claim 9, wherein the centers of the first wire, the second wire and the third wire are arranged on the same straight line.