CN216014841U

CN216014841U - Improved structure of flat cable and signal transmission device comprising same

Info

Publication number: CN216014841U
Application number: CN202122265207.XU
Authority: CN
Inventors: 叶时堃
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2022-03-11
Anticipated expiration: 2031-09-17

Abstract

The utility model relates to a winding displacement improvement structure and contain signal transmission device of this winding displacement improvement structure contain a winding displacement at least, and the winding displacement has a conductive layer, a metal level and an insulating layer according to the preface range upon range of, and the conductive layer contains a plural number signal line, and each of plural number signal line has a predetermined width respectively, and separates a predetermined interval each other between the plural number signal line. The utility model also relates to a signal transmission device comprising the improved flat cable structure; therefore, the width of the signal line of the flat cable for transmitting signals is widened by the improved grounding structure design, and the advantage of improving the signal transmission efficiency can be effectively achieved.

Description

Improved structure of flat cable and signal transmission device comprising same

Technical Field

The present invention relates to signal transmission technology, and more particularly to a flat cable improved structure capable of improving signal transmission efficiency by improving grounding structure design. The utility model also relates to a signal transmission device containing the improved flat cable structure.

Background

The improved structure of the general flat cable comprises a flat cable (such as signal transmission lines of PCIE (peripheral component interface express) specification buses, SATA (serial advanced technology attachment) specification buses and the like for computers) and connectors respectively arranged at two ends of the flat cable, wherein the connectors are electrically connected with the flat cable and connected to corresponding connectors (such as corresponding connectors of a male connector and a female connector) of external equipment, and signals are transmitted between the external equipment through the signal lines in the flat cable and the connectors.

Referring to fig. 1 and 2, fig. 1 is a plan view of a conventional flat cable, and fig. 2 is a cross-sectional view taken along a section of fig. 1A-a. As shown in fig. 1 and 2, the conventional flat cable 9 is laminated with a conductive layer 91, a foam layer 92, a metal layer 93, an insulating layer 94, and the like, and the conductive layer 91 is provided with a plurality of signal lines 911 and a plurality of ground lines 912. Conventionally, two signal lines 911 are matched with a ground line 912, so as to be repeatedly arranged into a flat cable 9 with a standard width, for example, a flat cable 9 with a standard width of forty-eight lines or seventy-two lines.

As described above, since the conductive layer 91 of the conventional flat cable 9 has the grounding line 912, the width of the signal line 911 is limited under the condition that the flat cable 9 has a standard width, thereby reducing the transmission rate. Therefore, the structure of the flat cable 9 must be designed properly, and the so-called skin effect and characteristic impedance must be considered in design.

The skin effect is also called as skin effect, and it is a phenomenon that when there is an alternating current or an alternating electromagnetic field in a conductor (such as the signal line 911), the current distribution inside the conductor is not uniform, and the current density inside the conductor exponentially decays with the distance from the surface of the conductor, that is, the current inside the conductor is concentrated on the surface of the conductor, when viewed from a cross section perpendicular to the current direction, almost no current flows through the center portion of the conductor, and only the current flows at the edge portion of the conductor, in short, the current is concentrated on the skin portion of the conductor. Since the skin effect causes the alternating current to pass only through the surface of the conductor, the current generates a thermal effect only on the surface of the conductor, and thus, for example, in the steel industry, the skin effect can be utilized to surface quench steel, increasing the hardness of the steel surface. Methods for reducing the skin effect can be used, for example, by so-called litz wires, i.e. by winding a plurality of metal wires around one another, so that the electromagnetic field is distributed relatively uniformly; or the solid conductor can be replaced by a hollow conductor tube, and the middle of the hollow conductor tube is supplemented with an insulating material.

In addition, the characteristic impedance refers to the resistance encountered when a high-frequency signal or an electromagnetic wave propagates through a conductor, and is expressed in ohm. The fluctuation of the impedance values in the conductors must be controlled so that signals can be transmitted at a correct speed, and there are different impedance calculation formulas for transmission lines formed by different types of conductors (such as coaxial transmission lines, line-type transmission lines, microstrip transmission lines, coplanar transmission lines, etc.). The impedance control can be achieved by changing different design conditions, such as changing the material, thickness and dielectric constant of the foam layer in the transmission line.

In summary, under the above principle, the widening of the width of the signal line 91 can be made into factors that increase the transmission distance and the transmission rate of the signal line 911 by setting different design conditions. In other words, the improvement of the transmission efficiency is very important in the current technological development, so it is an urgent issue to solve how to make the width of the conventional signal line 911 wider under the condition of the specification width of the flat cable 9 to improve the transmission efficiency and still maintain the grounding effect of the flat cable 9.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem, the aforesaid is known the winding displacement and is caused the problem that transmission efficiency reduces because of specification width restriction.

The technical means adopted by the utility model are as follows.

The utility model provides a winding displacement improvement structure contains a winding displacement, and this winding displacement has a conductive layer, a metal level and an insulating layer according to the preface stromatolite, and this conductive layer contains a plural number signal line, and each of this plural number signal line has a predetermined width respectively, and separates a predetermined interval each other between each of this plural number signal line.

As mentioned above, the improved structure of the flat cable provided by the present invention utilizes the metal layer of the flat cable as the grounding structure design. In other words, the conductive layer of the flat cable can only have the signal line without the grounding line, so that even under the condition of the specification width of the flat cable, the width of the signal line can be widened again, thereby effectively achieving the purpose of improving the signal transmission efficiency.

Alternatively, in a non-limiting embodiment, the predetermined width is between 0.4 mm and 1.0 mm, and the predetermined distance is between 0.4 mm and 1.2 mm.

Optionally, in a non-limiting embodiment, the flat cable further includes a low-k layer stacked between the conductive layer and the metal layer; the low dielectric constant layer is one of a polypropylene (PP) low dielectric constant layer, a Polyethylene (PE) low dielectric constant layer, a non-woven fabric low dielectric constant layer or a Teflon low dielectric constant layer.

Optionally, in a non-limiting embodiment, the Flat Cable is a Flexible Flat Cable (FFC).

The present invention also provides a signal transmission device, which comprises the above-mentioned flat cable improved structure and a plurality of conductive members, wherein the plurality of conductive members are separated by a specific distance, each of the plurality of conductive members comprises a first contact end and a second contact end, and the first contact end of each of the plurality of conductive members is electrically contacted with the metal layer.

Optionally, in a non-limiting embodiment, each of the plurality of conductive elements is a sheet-shaped conductive adhesive, and the first contact end and the second contact end are opposite side surfaces of the sheet-shaped conductive adhesive.

The present invention further provides a signal transmission device, at least comprising the above-mentioned flat cable improved structure, a connector and a plurality of conductive members, wherein the connector comprises an upper member and a lower member which are connected to each other; the plurality of conductive elements are arranged between the upper element and the lower element at a certain interval, each of the plurality of conductive elements comprises a first contact end and a second contact end, and the first contact end of each of the plurality of conductive elements is electrically contacted with the metal layer.

Optionally, in a non-limiting implementation example, at least one of the upper component and the lower component includes a plurality of grooves spaced apart from each other, the number of the plurality of grooves corresponds to the number of the plurality of conductive elements, and each of the plurality of conductive elements is a rod-shaped conductive strip and is disposed in each of the plurality of grooves.

Optionally, in a non-limiting embodiment, the first contact end of each of the plurality of conductive elements is a ridge.

Optionally, in a non-limiting embodiment, the second contact end of each of the plurality of conductive elements is curved.

Optionally, in a non-limiting embodiment, the upper member and the lower member are respectively rectangular, and one of the upper member and the lower member includes a buckle at two ends respectively, and the other of the upper member and the lower member includes a slot at two ends respectively, and the buckle and the slot are correspondingly buckled with each other.

Optionally, the plurality of conductive elements are made of an integrally formed conductive body, and the first contact end and the second contact end are formed by stamping.

The utility model discloses produced technological effect: the utility model provides a winding displacement improvement structure widens the width that the winding displacement is used for transmitting the signal line of signal with the ground structure design of improvement, borrows this can effectively reach the purpose that promotes signal transmission efficiency.

Drawings

Fig. 1 is a plan view of a conventional flat cable.

Fig. 2 is a cross-sectional view taken at section a-a of fig. 1.

Fig. 3 is a perspective view of the first preferred embodiment of the present invention.

Fig. 4 is a sectional view of the first preferred embodiment of the present invention.

Fig. 5 is an exploded view of the first preferred embodiment of the present invention in use.

Fig. 6 is a sectional view showing a use state of the first preferred embodiment of the present invention.

Fig. 7 is a perspective view of a second preferred embodiment of the present invention in use.

Fig. 8A is an exploded view of a second preferred embodiment of the present invention in use.

Fig. 8B is an exploded view of another structure of the conduction member according to the second preferred embodiment of the present invention in use.

Fig. 9 is a sectional view showing a state of use of the second preferred embodiment of the present invention.

Fig. 10 is a sectional view showing a use state of the third preferred embodiment of the present invention.

Description of the symbols:

1: improved structure of flat cable

2: flat cable

21: conductive layer

211: signal line

22: metal layer

23: insulating layer

24: low dielectric constant layer

3: connector with a locking member

31: upper part

310: groove

311: buckle

32: lower part

321: clamping groove

4: conducting piece

41: first contact terminal

42: second contact terminal

5: circuit board

51: signal conducting wire

511: elongated body

512: rectangular head

52: grounding wire

61: connecting piece

7: signal transmission device

9: flat cable

91: conductive layer

911: signal line

912: grounding wire

92: foam layer

93: metal layer

94: insulating layer

P: preset spacing

W: the width is preset.

Detailed Description

Please refer to fig. 3 and fig. 4, wherein fig. 3 is a perspective view of a first preferred embodiment of the present invention, and fig. 4 is a cross-sectional view of the first preferred embodiment of the present invention. Fig. 3 and 4 show a flat cable improved structure 1, and the flat cable improved structure 1 includes a flat cable 2.

As shown in fig. 3 and 4, the flat cable 2 is sequentially stacked with a conductive layer 21, a metal layer 22 and an insulating layer 23 in an up-down direction, wherein the conductive layer 21 includes a plurality of signal lines 211, each of the plurality of signal lines 211 has a predetermined width W, and each of the plurality of signal lines 211 is spaced apart from each other by a predetermined distance P. In another embodiment of the present invention, the upper and lower metal layers 22 of the flat cable 2 are grounded.

Accordingly, the conductive layer 21 of the flat cable 2 can only have the signal line 211 without the need of providing a ground line as in the conventional art, and accordingly, the signal line 211 can have more space without the limitation of the specification width of the flat cable 2, so that the width of the signal line 211 can be widened, and the purpose of improving the signal transmission efficiency can be effectively achieved.

The following formula (I) is a transmission characteristic impedance formula of the flat cable:

wherein Z₀Is characteristic impedance (characteristic impedance), epsilon_rIs dielectric constant, W is preset width, H is height of insulating layer, and T is thickness of conducting layer. In the flat cable 2, if the flat cable 2 has the same thickness and the same dielectric constant, the wider the predetermined width W of the signal line, the better the transmission efficiency. In other words, in the present invention, since the flat cable 2 has no grounding structure, the predetermined width W of the signal line can be widened, so that the transmission length of the flat cable 2 can be longer, and the transmission efficiency can be improved.

Referring to the difference between the embodiment and the comparative example, according to the description in table 1, the first comparative example is a conventional flat cable having a ground line and a signal line therein, and the width of the signal line is 0.3 mm; and the utility model discloses an in the embodiment, then for the winding displacement 2 that does not have the earth connection, in addition, according to actual structural design needs, the width W of predetermineeing of each of complex signal line 211 can be between 0.4 millimeter mm to 1.0 millimeter mm, and the interval P of predetermineeing each other between each of complex signal line 211 can be between 0.4 millimeter mm to 1.2 millimeter mm. Therefore, in the first to fourth embodiments of the present invention, under the premise that the thickness is the same and the dielectric constant is the same, when the predetermined width W of the signal line is widened, the transmission length can be longer, and the transmission efficiency is further improved:

bus cable signal line	Preset width W (mm)	Transmission Rate (G/s)	Longest transmissible length (M)
				Example one	0.4	6	1.0
Example two	0.5	6	2.0
				EXAMPLE III	0.6	6	2.5
Example four	0.7	6	3.0
				Comparative example 1	0.3	6	0.5

TABLE 1

The following describes the use state of the flat cable 2.

Please refer to fig. 5 and fig. 6 simultaneously, wherein fig. 5 is a perspective view illustrating a use status of the first preferred embodiment of the present invention, fig. 6 is a cross-sectional view illustrating a use status of the first preferred embodiment of the present invention, and fig. 3 and fig. 4 are also referred to simultaneously.

A signal transmission device 7 is shown in the figure, and the signal transmission device 7 includes a plurality of conductive members 4, a circuit board 5 and a flat cable 2 as described above. The plurality of conductive elements 4 are spaced apart from each other by a specific distance (not shown), and each of the plurality of conductive elements 4 includes a first contact end 41 and a second contact end 42, wherein the first contact end 41 of each of the plurality of conductive elements 4 is electrically contacted to the metal layer 22 of the flat cable 2. In addition, the specific spacing (not labeled) between the plurality of conductive elements 4 may be between 0.5 mm and 2.7mm, depending on the actual structural design.

In addition, as shown in the figure, the circuit board 5 is electrically connected to the flat cable 2, and the circuit board 5 includes a plurality of signal conducting wires 51 and a plurality of grounding wires 52, wherein the number of the plurality of signal conducting wires 51 corresponds to the number of the plurality of signal wires 211 of the conductor layer 21 of the flat cable 2 and are respectively in electrical contact with each other, that is, one signal conducting wire 51 is in electrical contact with one signal wire 211, for example, is in electrical contact with each other through a connecting member 61; in a preferred embodiment of the present invention, the connecting member 61 is preferably solder, and the connecting member 61 is used to connect the signal conducting line 51 and the signal line 211; in addition, the number of the plurality of grounding wires 52 corresponds to the number of the conductive element 4, and the second contact end 42 of the conductive element 4 is electrically contacted with each of the plurality of grounding wires 52.

In the present embodiment, the length of each of the plurality of signal conducting wires 51 of the circuit board 5 is greater than the length of each of the plurality of grounding wires 52, so that the effect of easy identification can be achieved by the difference in length. In addition, in the present embodiment, each of the plurality of signal conducting wires 51 of the circuit board 5 includes an elongated body 511 and a rectangular head 512 connected to each other, and the rectangular head 512 is outwardly extended relative to the elongated body 511, so that the larger-area rectangular head 512 of the signal conducting wire 51 can be easily electrically contacted with the connecting member 61 and thus the signal wire 211. In another embodiment of the present invention, each of the plurality of ground wires 52 of the connecting device 5 includes a ground terminal 521 connected to each other, and each of the ground terminals is connected to a ground plane 522, the ground plane 522 is electrically contacted with the second contact end 42 of the conductive element 4, and is electrically contacted with the metal layer 22 of the flat cable 2 through the first contact end 41 of the conductive element 4, so as to achieve ground conduction.

As shown in fig. 5 and fig. 6, the conductive element 4 is a sheet-shaped conductive adhesive (shown as a rectangular sheet), and the first contact end 41 and the second contact end 42 are opposite side surfaces of the sheet-shaped conductive adhesive. The conductive element 4 is in the form of a sheet-shaped conductive adhesive in the embodiment, but other methods, such as soldering (solder forming the conductive element), may be used.

As can be seen from the above, the grounding structure of the flat cable 2 is designed by directly using the metal layer 22, that is, the conductive element 4 is electrically contacted with the metal layer 22 of the flat cable 2 and the grounding line 52 of the circuit board 5 to form the grounding structure, so that, as mentioned above, the structure of the flat cable 2 with the conductive layer 21 only having the signal line 211 and no grounding line can make the signal line 211 have more space and the width of the signal line 211 can be widened again without affecting the specification and width of the flat cable 2, and thus the purpose of improving the signal transmission efficiency can be effectively achieved.

In the present embodiment, the flat cable 2 is a Flexible Flat Cable (FFC), but the invention is not limited thereto, and the flat cable 2 may be a Flexible Printed Circuit (FPC), for example. In addition, the flat cable 2 may further include a low dielectric constant layer 24, the low dielectric constant layer 24 is stacked between the conductive layer 21 and the metal layer 22, and the material of the low dielectric constant layer 24 may be one of polypropylene (PP), Polyethylene (PE), non-woven fabric, or teflon. In the manufacture of the flat cable 2, the flat cable 2 may further include a (film) adhesive layer, a (e.g. PET) film layer, etc.

Please refer to fig. 7 to fig. 10, wherein fig. 7 is a perspective view of a using state of the second preferred embodiment of the present invention, fig. 8A is an exploded view of the using state of the second preferred embodiment of the present invention, fig. 8B is an exploded view of a using state of another conducting element structure of the second preferred embodiment of the present invention, fig. 9 is a sectional view of the using state of the second preferred embodiment of the present invention, and fig. 10 is a sectional view of the using state of the third preferred embodiment of the present invention.

In the present embodiment, the main structure is the same as the above-mentioned first preferred embodiment, except that the flat cable improved structure 1 further includes a connector 3, and the connector 3 includes an upper member 31 and a lower member 32 joined to each other, and each of the plurality of conductive elements 4 is a rod-shaped conductive strip and is disposed between the upper member 31 and the lower member 32 (as shown in fig. 10).

Similarly, the circuit board 5 is electrically connected to the flat cable 2, and the circuit board 5 includes a plurality of signal conducting wires 51 and a plurality of grounding wires 52, wherein the number of the plurality of signal conducting wires 51 corresponds to the number of the plurality of signal wires 211 and is electrically contacted with each other, the number of the plurality of grounding wires 52 corresponds to the number of the plurality of conductive elements 4, and the second contact end 42 of each of the plurality of conductive elements 4 is electrically contacted with each of the plurality of grounding wires 52.

Like the first preferred embodiment, the present embodiment utilizes the rod-shaped conductive strip-shaped conductive element 4 to electrically contact the metal layer 22 of the flat cable 2 and the ground line 52 of the circuit board 5, thereby achieving the grounding effect, and similarly, the flat cable 2 does not need to have a ground line, so that the width of the signal line 211 of the flat cable 2 can be widened, thereby achieving the purpose of effectively improving the transmission efficiency.

In the present embodiment, the upper part 31 includes a plurality of grooves 310 spaced apart from each other (of course, the plurality of grooves 310 may also be spaced apart from each other on the lower part 32, or both the upper part 31 and the lower part 32), the number of the plurality of grooves 310 corresponds to the number of the plurality of conductive elements 4, and each of the plurality of conductive elements 4 corresponds to each of the plurality of grooves 310, that is, one conductive element 4 corresponds to one groove 310, for example, the conductive element 4 can be inserted into the grooves 310 in a tight fit manner, and thereby can be prevented from falling.

In the present embodiment, the upper member 31 and the lower member 32 are respectively rectangular, the upper member 31 (the lower member 32) includes a buckle 311 at two ends, the lower member 32 (the upper member 31) includes a slot 321 at two ends, and the buckle 311 and the slot 321 are correspondingly engaged with each other. Of course, the connection manner of the upper part 31 and the lower part 32 is not limited to this, and may be, for example, screw, bolt, or adhesive.

In order to make the plurality of conductive elements 4 electrically contact the metal layer 22 of the flat cable 2 and the ground line 52 of the circuit board 5 more conveniently, in the embodiment, the first contact end 41 of each of the plurality of conductive elements 4 is in a ridge shape, and the second contact end 42 of each of the plurality of conductive elements 4 is in an arc shape. In other words, the ridge-shaped and arc-shaped structure design can make the first contact end 41 and the second contact end 42 form a protruding point to be more conveniently electrically contacted with the metal layer 22 of the flat cable 2 and the ground line 52 of the circuit board 5. Of course, the shapes of the first contact end 41 and the second contact end 42 of the plurality of conductive elements 4 are not limited to the above, and other shapes, such as a pointed shape, a polygonal shape, etc., are also possible. As shown in fig. 8B, in another embodiment of the present invention, the plurality of conductive elements 4 are made of an integrally formed conductive body (not shown), and the first contact end 41 and the second contact end 42 are formed by stamping; accordingly, the punched conductive body can be directly formed on the upper member 31 or the lower member 32 of the connector 3.

Claims

1. An improved flat cable structure, comprising:

the flat cable (2) is sequentially laminated with a conductor layer (21), a metal layer (22) and an insulating layer (23), the conductor layer (21) comprises a plurality of signal lines (211), each of the plurality of signal lines (211) has a preset width (W), and each of the plurality of signal lines (211) is spaced by a preset distance (P).

2. The flat cable improvement structure according to claim 1, wherein the predetermined width (W) is between 0.4 mm and 1.0 mm.

3. The flat cable improvement structure according to claim 1, wherein the predetermined pitch (P) is between 0.4 mm and 1.2 mm.

4. The flat cable improvement structure according to claim 1, wherein the flat cable (2) further comprises a low dielectric constant layer (24), and the low dielectric constant layer (24) is stacked between the conductive layer (21) and the metal layer (22).

5. The flat cable improved structure according to claim 4, wherein the low dielectric constant layer (24) is one of a polypropylene low dielectric constant layer, a polyethylene low dielectric constant layer or a Teflon low dielectric constant layer.

6. A signal transmission device, comprising:

a flat cable modification structure as claimed in any one of claims 1 to 5; and at least one conducting element (4), wherein the conducting element (4) comprises a first contact end (41) and a second contact end (42), and the first contact end (41) of the conducting element (4) is electrically contacted with the metal layer (22).

7. The signal transmission device according to claim 6, wherein each of the conductive members (4) is a sheet-shaped conductive adhesive, and the first contact end (41) and the second contact end (42) are opposite sides of the sheet-shaped conductive adhesive.

8. A signal transmission device, comprising:

a flat cable modification structure as claimed in any one of claims 1 to 5;

a connector (3) comprising an upper member (31) and a lower member (32) joined to each other; and a plurality of conductive members (4) spaced apart from each other by a specific distance and disposed between the upper member (31) and the lower member (32), each of the plurality of conductive members (4) including a first contact end (41) and a second contact end (42), the first contact end (41) of each of the plurality of conductive members (4) being electrically contacted with the metal layer (22), respectively.

9. The signal transmission device according to claim 8, wherein the upper member (31) and the lower member (32) are respectively rectangular, and one of the upper member (31) and the lower member (32) includes a latch (311) at two ends thereof, and the other of the upper member (31) and the lower member (32) includes a slot (321) at two ends thereof, the latch (311) and the slot (321) being correspondingly engaged with each other.

10. The signal transmission device according to claim 8, wherein the plurality of conductive elements (4) are formed by integrally forming a conductive body and stamping the first contact end (41) and the second contact end (42).