TW202001933A - Flat data transmission cable - Google Patents

Abstract

The present invention relates to a flat data transmission cable. The data transmission cable includes a plurality of wires, an insulative layer enclosing all wires and a metal shielding film covering the insulative layer. The metal shielding film has a length adapt to that of the data transmission cable and a width not less than a circumferential length of the data transmission cable.

Description

Flat data transmission cable

The invention relates to a flat data transmission cable, in particular to a flat data transmission cable with stable signal transmission performance.

In the 3C industry, the transmission cable can be used as a medium for electrical connection between two electronic devices, and can stably perform the expected signal transmission operation. With this, transmission cables are commonly used in various electronic devices. Among them, the transmission cables connected with interfaces such as USB, HDMI, DVI, Displayport, SAS and others have high transmission rate, long distance, high quality and are popular among the public, and the number of uses is also increasing. The transmission cables have a plurality of metal wires inside. The plurality of metal wires are generally fixed in a cylindrical shape only by the outer Mylar layer, and are not shielded, which makes the signal transmission stability of the entire transmission cable poor.

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

The purpose of the present invention is to provide a flat data transmission cable with stable signal transmission performance.

To achieve the above object, the present invention provides a flat data transmission cable, which includes a plurality of conductors arranged side by side; wherein, the data transmission cable further includes a plastic layer integrally covering the plurality of conductors, and the plastic layer A metal shielding film outside the layer, the metal shielding film having a length matching the data transmission cable and a width not less than the circumferentially extending length of the data transmission cable.

As a further improvement of the present invention, wherein the width of the metal shielding film is greater than the circumferential extension of the data transmission cable, and both ends in the width direction of the metal shielding film are in the width direction of the data transmission cable One side is pressed and bonded to each other, so that the metal shielding film forms a covering part covering the plastic layer and a pressing part connected to one side of the covering part.

As a further improvement of the present invention, wherein the metal shielding film is circumferentially arranged along the data transmission cable, and overlapping regions fixed and fixed to each other are formed.

As a further improvement of the present invention, the metal shielding film has at least an aluminum foil layer and an adhesive layer disposed on the side of the aluminum foil layer facing the plastic layer, and the metal shielding film is fixed to the outside of the plastic layer by heat fusion after the adhesive layer.

As a further improvement of the present invention, the metal shielding film further has an insulating layer disposed on the surface of the aluminum foil layer facing away from the plastic layer.

As a further improvement of the present invention, wherein the overall thickness of the metal layer is 0.010 mm to 0.055 mm.

As a further improvement of the present invention, the overall thickness of the wire and the plastic layer is 0.25 mm to 0.8 mm.

As a further improvement of the present invention, each of the wires further includes a coating layer covering the conductor, and the coating layer and the plastic layer are made of similar materials.

As a further improvement of the present invention, wherein the conductors of the plurality of conductors have the same outer diameter, and the center distance between two adjacent conductors is the same, the conductor outer diameter adopts 31 to 34 American wire gauge.

As a further improvement of the present invention, wherein the wire has a conductor, and in the thickness direction of the data transmission cable, the thickness from the conductor to the outer edge of the plastic layer is 0.1 mm to 0.45 mm.

The metal shielding film of the present invention has a length that matches the data transmission cable and a width that is not less than the circumferential extension of the data transmission cable, thereby enabling the metal shielding film to be realized once in the length and width directions directly It is fully covered to ensure the continuity of the shielding of the metal shielding film, to avoid any phenomenon of impedance discontinuity, and thus the signal transmission can be continuously and stably performed.

The invention relates to a flat-type data transmission cable. The data transmission cable includes at least a plurality of wires arranged side by side and a plastic layer integrally covering the plurality of wires.

Please refer to the first and second figures together to show the first preferred embodiment of the data transmission cable 100 of the present invention. The data transmission cable 100 includes a plurality of wires 1 arranged side by side, a plastic layer 2 integrally covering the plurality of wires 1, and a metal shielding film 3 formed around the plastic layer 2.

In this embodiment, each of the wires 1 has a conductor 11 and a cladding layer 12 wrapped around each of the conductors 11. The central axis of the conductor 11 is on the same plane. The plastic layer 2 is formed on the outer side of the cladding layer 12 of the plurality of wires 1 to form a common single insulating layer; and the plastic layer 2 is formed parallel to the plane where the central axis of the conductor 11 is located Upper and lower surfaces. The upper and lower surfaces of the plastic layer 2 parallel to each other can effectively maintain the arrangement of the wires 1 and prevent twisting or folding; further, it can further facilitate the coating of the metal shielding film 3, Avoid air interlayer between the plastic layer 2 and the metal shielding film 3.

The cladding layer 12 can protect the conductor 11 well, and prevent problems such as short circuit caused by contact between adjacent conductors 11 during the molding of the plastic layer 2. Furthermore, when the cladding layer 12 is designed, the thickness of the plastic layer 2 can also be set as light and thin as possible to ensure that the relative positions of all the wires 1 are fixed, thereby reducing the thickness of the entire wire, and making the cost The invention data transmission cable 100 is more flexible and thinner.

The materials of the cladding layer 12 and the plastic layer 2 are the same or similar; they are preferably made of similar materials, so that the plastic layer 2 and the cladding layer 12 can be combined when the data transmission cable 100 of the present invention is molded Good performance, can achieve a good fusion, minimize delamination problems or air intrusion, molding effect is better.

Further, the homogeneous materials are polyhydrocarbon compounds. Further, the polyhydrocarbon compounds are preferably high-density polyethylene.

In addition, the above-mentioned cladding layer 12 and the plastic layer 2 can be set to be preferably made of a plastic material having a dielectric coefficient close to air, thereby making the cladding layer 12 and the plastic layer 2 have a smaller impedance, thereby providing the conductor 11 A good signal transmission environment reduces signal propagation delay, reduces crosstalk between signals, ensures high-speed and effective signal transmission, and reduces signal attenuation.

The above embodiment of the wire 1 with the cladding layer 12 is preferably such that the distance between the outer edge of the conductor 11 and the outer edge of the plastic layer 2 in the thickness direction of the data transmission cable 100 is 0.1 mm to 0.45 Between mm, preferably between 0.15mm and 0.25mm. The above distance is also the distance between the conductor 11 and the metal shielding film 3, which is one of the factors that affect the stable signal transmission of the wire 1 and is particularly a high-frequency data transmission. The smaller the distance, the smaller the impedance and the high-frequency performance The better, and the smaller the thickness of the entire data transmission cable 100, the more flexible and thin. However, when the thickness is too small, the metal shielding film 3 will affect the signal transmission of the conductor 11, and the above-mentioned interval of the present invention can better meet the needs of various aspects.

Of course, as shown in the third figure, as another preferred embodiment of the present invention, the wire 1 may also only include the conductor 11, that is, there is no separate coating layer 12 provided directly by the plastic layer 2. The overall cladding and insulation can also achieve the purpose of the invention, and with this arrangement, the thickness of the plastic layer 2 can be further reduced, so that the overall thickness of the data transmission cable 100 is further reduced.

With reference to the first to third figures, in this embodiment, the wires 1 are arranged at equal intervals. In the arrangement direction of the wires 1, the number of the wires 1 is 3-50 between. The plurality of wires 1 has at least two ground wires and a signal wire disposed between the two ground wires. In this way, it is possible to eliminate the interference around the signal conductor between them by the grounding conductor, ensure the signal transmission environment of the signal conductor, and thereby improve the signal transmission efficiency and stability.

As a preferred embodiment of the present invention, to meet the development needs of high-speed signal transmission, the number of the signal wires between two adjacent ground wires is preferably set to two, and the two signal wires are configured to transmit differential signals Signal wire set. That is, the ground wire is used for signal wire group protection to ensure high-frequency transmission performance.

Further, all the wires 1 only include the ground wire and the signal wire group, and the number of the ground wire is one more than the number of the signal wire group. Preferably, in the arrangement direction of the conductors 1, the two conductors 1 located on both sides of the edges are ground conductors, and there is a pair of signal conductor groups between two adjacent ground conductors. In this way, each group of signal conductors can be protected by grounding conductors on both sides, further improving the high-frequency transmission characteristics of the entire data transmission cable.

Of course, as another preferred embodiment of the present invention, in order to cooperate with other single-ended signal transmission, the signal wire may also have a single-ended signal wire. For example, to adapt to the Mini SAS (Mini Serial Attached Small Computer System Interface, Mini Serial Serial SCSI) product design, the number of the signal wires is twice the number of ground wires; at this time, in the direction of the arrangement of the wires 1, The single-ended signal conductor may be disposed outside the ground conductor, that is, on both sides of the entire data transmission cable 100, and the ground conductor and the signal conductor group are arranged in sequence between the two single-ended signal conductors.

Furthermore, as another embodiment of the present invention, the data transmission cable 100 may also be provided with only a plurality of grounding conductors and single-ended signal conductors; specifically, if it is suitable for narrow Mini SAS products, the number of the grounding conductors is greater than the signal The number of conductors is one more, the specific arrangement is that the conductors 1 located on both sides of the edge are grounding conductors, and the entire data transmission cable 100 is shielded and protected from both edges; and in the direction of arrangement, the grounding conductor and signal The wires are arranged alternately in sequence.

In the present invention, the outer diameters of the conductors 11 of the plurality of wires 1 are the same, and it is preferably set such that the ratio between the center distance between adjacent wires 1 and the outer diameter of the conductors 11 is 1.4 to 2.8; This kind of setting relationship makes it possible to effectively reduce the differential impedance of each pair of differential signal wire groups when the wire 1 is set to have a differential signal wire group, and effectively control the coupling effect within the range of 75Ω to 110Ω generally required Enhancement to ensure long-distance transmission of high-frequency signals.

Preferably, the wire 1 is provided with a differential signal wire group, and the above-mentioned plastic layer 2 and metal shielding film 3 are arranged so that the center distance between adjacent wires 1 of each differential signal wire group and the outer diameter of the conductor 11 When the ratio is 1.4 to 2.8, the differential impedance of the differential signal wire set is 79Ω to 106Ω.

Specifically, when the ratio between the center distance of the conductor 1 in each pair of the aforementioned signal conductor groups and the outer diameter of the conductor 11 is 1.55 to 2.31, the differential impedance between the conductors 1 within each pair of the signal conductor groups can be controlled In 79Ω to 91Ω.

As a preferred embodiment of the present invention, in order to further ensure the softness and thinness of the data transmission cable 100, in this embodiment, the outer diameter of the conductor 11 is 31AWG or 32AWG or 33AWG. At this time, each pair of the signal wire group The center distance of the inner conductor 1 is set to 0.28mm to 0.52mm, which can ensure that the differential impedance between the conductors 1 in each pair of the signal conductor group is 79Ω to 91Ω.

Among them, when the outer diameter of the conductor 11 is 31 AWG, the center distance of the wires 1 in each pair of the signal wire group is set to 0.44mm to 0.52mm, which can ensure the differential impedance between the wires 1 in each pair of the signal wire group It is 79Ω to 91Ω; specifically, when the center-to-center spacing is 0.48mm, the differential impedance between the wires 1 in each pair of the signal wire group can be controlled to 85Ω.

When the outer diameter of the conductor 11 is 32 AWG, the center distance of the wires 1 in each pair of signal wire groups is set to 0.36mm to 0.44mm, which can ensure that the differential impedance between the wires 1 in each pair of signal wire groups is 79Ω To 91Ω. Specifically, when the center-to-center distance is 0.40 mm, the differential impedance between the wires 1 in each pair of the signal wire groups can be controlled to 85Ω.

When the outer diameter of the conductor 11 is 33AWG, the center distance of the wires 1 in each pair of signal wire groups is set to 0.28mm to 0.36mm, which can ensure that the differential impedance between the wires 1 in each pair of signal wire groups is 79Ω To 91Ω. Specifically, when the center-to-center distance is 0.32 mm, the differential impedance between the wires 1 in the signal wire group can be controlled to 85Ω.

In addition, when the ratio between the center distance of the wire 1 in each pair of the signal wire group and the outer diameter of the conductor 11 is 2.18 to 2.84, the differential impedance between the wire 1 in each pair of the signal wire group is 94Ω To 106Ω.

As a preferred embodiment of the present invention, in order to further ensure the softness and thinness of the data transmission cable 100, the outer diameter of the conductor 11 in the present invention adopts 33AWG or 34AWG; at this time, the center of the wire 1 in each pair of the signal wire set The spacing is set to 0.35mm to 0.51mm, which can ensure that the differential impedance of the wire 1 in each pair of the signal wire group is 94Ω to 106Ω.

In this embodiment, when the outer diameter of the conductor 11 is 33 AWG, the center distance of the wire 1 in each pair of the signal wire group is set to 0.43mm to 0.51mm to ensure that the wire 1 in each pair of the signal wire group The differential impedance is from 94Ω to 106Ω; specifically, when the center-to-center distance is 0.48mm, the differential impedance between the wires 1 in each pair of the signal wire group can be controlled to 100Ω.

When the outer diameter of the conductor 11 is 34 AWG, the center distance of the wire 1 in each pair of the signal wire set is set to 0.35mm to 0.43mm, which can ensure that the differential impedance of the wire 1 in each pair of the signal wire set is 94Ω to 106Ω ; Specifically, when the center distance is 0.4 mm, the differential impedance between the wires 1 in each pair of the signal wire group can be controlled to 100 Ω.

Preferably, in the present invention, the wires 1 each have a conductor 11 and a cladding 12, and the data transmission cable 100 is arranged such that the center distance between the wires 1 is equal to the outer diameter of the wires 1, that is, adjacent The wire 1 is placed against the arrangement. In this way, the overall shaping control of the data transmission cable 100 is facilitated.

Combining the above, and combining the two embodiments in which the wire 1 may or may not have the aforementioned coating layer 12, after a plurality of the wires 1 are entirely covered by the plastic layer 2, the wires 1 and the plastic layer 2 The overall thickness can be controlled from 0.25mm to 0.8mm. In combination with the specifications of the conductor 11 of the above-mentioned wire 1 being set at about 31 AWG to 34 AWG, the overall thickness of the wire 1 and the plastic layer 2 can be further controlled to 0.3 mm to 0.6 mm. Further, for example, when the conductor 11 uses 32 AWG and the cladding layer 12 is provided, the cladding layer 12 can be set to a thickness of about 0.1 mm, and the single-sided plastic layer 2 outside the conductor 11 can be set to about 0.07, thereby, The overall thickness of the wire 1 and the plastic layer 2 is about 0.54. Of course, the thickness of the cladding layer 12 and the plastic layer 2 can also be adjusted according to actual needs and technical capabilities, and is not limited to the specific configuration of the embodiment in which the conductor 11 is 32 AWG.

As described above, the plastic layer 2 is integrally coated on the outside of the plurality of conductive wires 1, and the metal shielding film 3 is coated on the outside of the plastic layer 2. In the present invention, the metal shielding film 3 has a length matching the data transmission cable 100 and a width not less than the circumferentially extending length of the data transmission cable 100. In this way, the metal shielding film 3 can be directly and completely wrapped in the length and width directions, ensuring the continuity of the shielding of the metal shielding film 3, and avoiding any phenomenon of impedance discontinuity, thereby making the signal The transmission can be continued and stable. In addition, the metal shielding film 3 also has a fireproof function, which can make the data transmission cable 100 reach a standard flame retardant grade FT-2 and a vertical flame retardant grade VW-1.

Preferably, the width of the metal shielding film 3 is set to be greater than the circumferential extension of the data transmission cable 100, so that there is overlap at the docking position, thereby further ensuring the integrity of the coating, and thus According to the invention, when the data transmission cable 100 is bent or the like, it can effectively avoid the separation of the butt joints of the metal shielding film 3 and cause partial uncovering.

As shown in the first to third figures, as one of the preferred embodiments of the present invention, the two ends of the metal shielding film 3 in the width direction are pressed against one side of the data transmission cable 100 in the width direction Tightly adhere, so that the metal shielding film 3 forms a covering portion 34 covering the plastic layer 2 and a pressing portion 35 connected to the covering portion 34 side. The covering portion 34 completely covers the plastic layer 2 in the circumferential direction to realize an all-round mask, and the pressing portion 35 is fixed on one side, which is convenient for fixing and bonding, and can also tighten the metal shielding film 3 Fixing, further ensuring the tightness of the covering portion 34 and the plastic layer 2.

Of course, as another embodiment, the metal shielding film 3 may also be circumferentially arranged along the data transmission cable 100, and overlapping regions fixed and fixed to each other are formed outside the plastic layer 2. That is, the metal shielding film 3 as a whole is wound and extended in the circumferential direction of the data transmission cable 100, so that both ends of the metal shielding film 3 in the width direction extend reversely and are overlapped and disposed outside the plastic layer 2.

Further, in the present invention, the metal shielding film 3 has at least an aluminum foil layer 31 and an adhesive layer 32 disposed on the side of the aluminum foil layer 31 facing the plastic layer 2, the metal shielding film 3 is heated by the adhesive layer 32 After fusion, the adhesive is fixed on the outer side of the plastic layer 2; thereby, the fixing of the metal shielding film 3 is relatively simple and convenient, and does not require the intervention of the Mylar layer to fix, so that the entire cable can be made thinner and softer; The air can also be exhausted, and because of the use of hot-melt adhesive fixation, the bonding strength and adhesion of the metal shielding film 3 and the plastic layer 2 are increased, so that the exhausted air cannot enter, achieve a dense effect, and then achieve a tight coating. High frequency transmission performance, soft and thin effect.

In addition, the metal shielding film 3 in the present invention also has an insulating layer disposed on the surface of the aluminum foil layer 31 facing away from the plastic layer 2. This insulating layer can replace the Mylar layer in the prior art to provide external insulation while protecting Aluminum foil layer 31. Of course, the data transmission cable 100 of the present invention may further be provided with a Mylar layer outside the metal layer 3.

Further, the overall thickness of the metal shielding film 3 in the present invention can be set to 0.010 mm to 0.055 mm, so as to minimize the thickness of the entire data transmission cable 100 on the basis of external shielding. Preferably, the overall thickness of the metal layer 3 is set to 0.015 mm to 0.025 mm.

The overall thickness of the data transmission cable 100 of the present invention can be further controlled to 0.35 mm to 0.65 mm by combining the overall arrangement of the conductor 11, the cladding layer 12 and the plastic layer 2 and the thickness setting of the metal layer 3. For example, when the conductor 11 uses 32 AWG, the overall thickness of the wire 1 and the plastic layer 2 is about 0.54, and when the thickness of the combined metal layer 3 is set to 0.045 mm, the thickness of the entire data transmission cable 100 can be 0.63 mm. Of course, the thickness of the cladding layer 12, the plastic layer 2 and the metal layer 3 can also be adjusted according to actual needs and technical capabilities, and is not limited to the specific settings of the foregoing embodiments.

In particular, it should be pointed out that for those of ordinary skill in the art, equivalent changes made to the present invention under the teaching of the present invention should still be included in the scope claimed by the patent application scope of the present invention.

100‧‧‧Data transmission cable 1‧‧‧ Lead 11‧‧‧Conductor 12‧‧‧ coating 2‧‧‧Plastic layer 3‧‧‧Metal layer 31‧‧‧Aluminum foil layer 32‧‧‧adhesive layer 34‧‧‧ Coverage 35‧‧‧Compression part

The first figure is a partial perspective view of a preferred embodiment of the flat data transmission cable of the present invention. The second diagram is a front view of the data transmission cable shown in the first diagram. The third figure is a front view of another preferred embodiment of the flat data transmission cable of the present invention.

100‧‧‧flat data transmission cable

1‧‧‧ Lead

2‧‧‧Differential signal cable

3‧‧‧Ground wire

11‧‧‧Conductor

4‧‧‧Plastic layer

5‧‧‧Metal layer

51‧‧‧Aluminum foil layer

52‧‧‧adhesive layer

53‧‧‧Insulation

Claims (10)

A flat data transmission cable includes: a plurality of conductors arranged side by side; wherein the data transmission cable further includes a plastic layer integrally covering the plurality of conductors, and a metal shielding film disposed outside the plastic layer, the The metal shielding film has a length matching the data transmission cable and a width not less than the circumferentially extending length of the data transmission cable. The data transmission cable according to item 1 of the patent application scope, wherein the width of the metal shielding film is greater than the circumferential extension of the data transmission cable, and both ends of the metal shielding film in the width direction are One side of the data transmission cable in the width direction is pressed and bonded to each other, so that the metal shielding film forms a covering portion covering the plastic layer and a pressing portion connected to one side of the covering portion. The data transmission cable as described in item 1 of the scope of the patent application, wherein the metal shielding film is circumferentially arranged along the data transmission cable and formed with overlapping regions fixed and fixed to each other. The data transmission cable according to item 1 of the patent application scope, wherein the metal shielding film has at least an aluminum foil layer and a bonding layer provided on the side of the aluminum foil layer facing the plastic layer, and the metal shielding film is thermally melted by the bonding layer The adhesive is fixed outside the plastic layer. The data transmission cable as described in item 4 of the patent application scope, wherein the metal shielding film further has an insulating layer disposed on the surface of the aluminum foil layer facing away from the plastic layer. The data transmission cable as described in item 5 of the patent application scope, wherein the overall thickness of the metal layer is 0.010 mm to 0.055 mm. The data transmission cable as described in item 1 of the patent application scope, wherein the overall thickness of the wire and the plastic layer is 0.25 mm to 0.8 mm. According to the data transmission cable described in item 1 of the patent application scope, each of the wires further includes a coating layer covering the conductor, and the coating layer and the plastic layer are made of similar materials. The data transmission cable as described in item 8 of the patent application scope, wherein the conductors of the plurality of conductors have the same outer diameter and the center distance between two adjacent conductors is the same, and the conductor outer diameter adopts 31 to 34 US wire gauge. The data transmission cable according to item 8 of the patent application scope, wherein the wire has a conductor, and the thickness of the conductor to the outer edge of the plastic layer is 0.1 mm to 0.45 mm in the thickness direction of the data transmission cable.

Images