TWM514125U - Flexible flat cable - Google Patents

Description

Flexible flat cable

The present invention relates to a flexible flat cable, and more particularly to a flexible flat cable that can be used to transmit high frequency signals and high current.

As people's demand for electronic communication is increasing, the signal transmission speed requirements of electronic devices are becoming higher and higher, and the development of electronic technology tends to be high-frequency signals and high-current transmission. Therefore, the transmission line is also relatively difficult to manufacture. In order to transmit high-frequency signals quickly, optical fibers are generally used as cables. However, the cost of optical fiber is high. In addition, if it is necessary to transmit power at the same time, it is necessary to combine another power cable, and the structure of the transmission line is more complicated.

Furthermore, the amount of current required to match electronic devices is increasing, and the current transmission specifications of electrical connectors are becoming higher and higher. For USB Type-C connectors, for example, different current specifications are applied depending on the application of the line assembly. Regarding power transmission specifications, the requirements for wires and connectors will reach 5A, and the transmission of signals can reach a transmission rate of up to 10G bit per second. The existing USB Type-C has only a few cables that are related to the outside of the electronic device. However, due to the thin and light electronic products, such as mobile phones, there are some conditions that make it impossible to use the circuit board layout to achieve signal transmission between the input and output (IO) connectors and internal electronic components. For example, the transmission line is required to avoid the battery to make signals. Transfer to an external input/output connector, or external connector. Therefore, how to achieve high frequency and high current transmission with a lower cost transmission line is the solution of this creation.

The present embodiment is to provide a flexible flat cable with a lower cost transmission line to achieve high frequency and high current transmission requirements. In addition, the power leads are integrated with a smaller number of power leads to achieve high current transmission requirements and the overall width of the flexible flat cable can be reduced.

In order to achieve the above, a flexible flat cable provided by one embodiment of the present invention has one end electrically connected to an input/output connector through a riser card, and the output connector includes a plurality of terminals. . The flexible flat cable includes a plurality of wires arranged in parallel, and an insulating layer covering the wires. The wires include at least one first integrated power line and a plurality of signal lines; wherein two adjacent ones have a spacing between the signal lines, and the signal lines have the same width, the first integrated type The width of the power line is equal to at least twice the width of the signal line plus at least one of the spaces; wherein the thickness of the first integrated power line is greater than the thickness of the signal line; wherein the flexible flat cable further comprises a shielding layer package Covering the periphery of the insulating layer, the wires include at least one grounding wire and a transition conductor connecting the at least one grounding wire to the shielding layer.

The beneficial effect of the present invention may be that at least the power supply wires are integrated with a smaller number of power supply wires, high current transmission requirements can be achieved, and the overall width of the flexible flat cable can be reduced.

In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are only for reference and explanation, and are not intended to limit the creation.

10, 10a‧‧‧Flexible flat cable

12‧‧‧ wire

1201, 1204, 1207, 1216, 1219, 1222‧‧‧ grounding wire

1202, 1203, 1205, 1206, 1211, 1212, 1217, 1218, 1220, 1221‧‧‧ signal lines

1210, 1213‧‧‧ spare wire

1209, 1214‧‧‧ Non-integrated power cord

1208‧‧‧First integrated power cord

1215‧‧‧Second integrated power cord

12g‧‧‧Transitive conductor

13‧‧‧Wire

1301, 1323‧‧‧ Grounding wire

1302, 1311, 1312, 1322‧‧‧ signal lines

1308, 1315‧‧‧ first integrated power cord

1316‧‧‧Unconformed power cord

14‧‧‧Insulation

16‧‧‧Shield

20‧‧‧Output connector

21‧‧‧ terminals

21A‧‧‧Upper terminal

21B‧‧‧lower terminal

210‧‧‧ tongue plate

24‧‧‧Shaded housing

26‧‧‧ Fixing frame

30, 30a‧‧‧Transfer card

32‧‧‧Substrate

34‧‧‧Transfer circuit

34a‧‧‧First pin

342, 343, 345‧‧‧ integrated power pins

341‧‧‧Signal pin

34b‧‧‧second pin

S‧‧‧ spacing

C‧‧‧Central Line

D1, D2, d‧‧‧ width

Figure 1 is a front perspective view of the flexible flat cable of the present invention.

Figure 2 is a rear perspective view of the flexible flat cable of the present invention.

Fig. 3 is a perspective view of the flexible flat cable of the present invention applied to an input/output connector.

Figure 4 is a cross-sectional view of the flexible flat cable of the present invention taken along line VI-VI of Figure 3 .

FIG. 5 is a three-dimensional combination diagram of the flexible flat cable and the input/output connector and the adapter card of the present invention.

FIG. 5A is a front view of the flexible flat cable of the present invention combined with the input/output connector and the riser card.

FIG. 6 is a top view of the flexible flat cable and the input/output connector and the adapter card.

Fig. 7 is a configuration diagram of the definition of the reference position of the flexible flat cable and the input/output connector of the present invention.

Figure 8 is a partial perspective view of another embodiment of the flexible flat cable of the present invention.

FIG. 9 is a configuration diagram of another reference pin definition of the flexible flat cable and the input/output connector of the present invention.

[First Embodiment]

Please refer to FIG. 1 and FIG. 2 , which are respectively a perspective view of the front and back sides of the flexible flat cable. This embodiment provides a flexible flat cable (FFC) 10 having a plurality of parallel-arranged wires 12 and an insulating layer 14 covering the wires 12. The flexible flat cable 10 further includes a shielding layer 16 covering the periphery of the insulating layer 14. The flexible flat cable can be simply referred to as a soft cable, which has the advantages of soft, random bending and folding, thin thickness, small volume, simple connection, convenient disassembly, and easy to solve electromagnetic shielding (EMI). In addition, flexible flat cable is more expensive than flexible printed circuit cable (FPC) and fiber.

As shown in FIG. 2, the wires 12 include at least one first integrated power line 1208, ground lines (such as reference numerals 1201, 1204, 1207, 1222) and a plurality of signal lines (such as reference numerals 1202, 1221). One of the features of the present creation is that the width of the first integrated power cord 1208 is greater than twice the width of the signal line (e.g., numeral 1202).

Since the current carrying capacity is in principle dependent on the profile of the trace (eg copper foil) The cross-sectional area and temperature rise, and the cross-sectional area is positively related to the width and thickness of the line. Compared to the conventional one-ounce wire size of the conventional flexible flat cable, the aforementioned one ounce (oz) is the industry's usual copper foil thickness unit, and the copper foil specification is in ounces per square inch. Definition, 1 ounce = 0.0014 inches (inch) = 1.4 mils = 0.035 mm (mm). The above-mentioned conventional wires usually only transmit a current of about 0.8 amps. To transmit a higher current, for example, to meet the 5 amp transmission standard of the USB Type-C connector, more than seven wires are required to be sufficiently distributed. 5 amps of current. In this case, the number of wires of the flexible flat cable is excessive, and the overall width of the flexible flat cable is too wide. With the above arrangement, the first integrated power cord 1208 can transmit more than twice the 0.8 amp, which can exceed 1.6 amps.

More specifically, the width of the first integrated power cord 1208 can be considered as the total width of two adjacent conductors 12. Two adjacent ones of the signal lines (eg, 1202) have a spacing s. In other words, the width D1 of the first integrated power line 1208 is equal to twice the width (d) of the signal line (eg, 1202) plus The last spacing (s). Preferably, all of the signal lines of the present creation may have the same width (d) and the same pitch (s), but are not limited thereto. Thereby, if the thickness of the wire is the same as that of the conventional flexible flat cable, it is assumed that the pitch s is equal to or slightly larger than half the width of the conductor 12 (such as the signal line 1202 or the ground line 1201) which is generally not widened. Next, the first integrated power line 1208 can carry a current of 2 to 2.25 amps.

In addition, the wire 12 of the embodiment further includes a second integrated power line 1215 having a width D2 greater than a width D1 of the first integrated power line 1208. The width D2 of the second integrated power line 1215 is equal to three times the width (d) of the signal line (such as reference numeral 1202) plus twice the spacing (s). Accordingly, the current transmitted by the second integrated power line 1215 can reach 3.2 amps or more. According to the above structural design, the first integrated power line 1208 and the second integrated power line 1215 can transmit more than 5.2 amps of current. The flexible flat cable of the present embodiment has a width occupied by a conductor for transmitting current as a whole, and occupies only the width of five conductors 12 (such as the signal line 1202 or the ground line 1201) which are generally not widened. phase Compared with the conventional flexible flat cable, more than seven wires are needed to distribute the current of 5 amps. This embodiment can reduce the number of wires of the flexible flat cable by at least two and reduce the overall width of the flexible flat cable. The above design is based on the normal thickness. If the first integrated power line 1208 and the second integrated power line 1215 are thickened in this embodiment, a larger current can be transmitted.

Please refer to FIG. 2 , wherein the wires 12 include at least one grounding wire (1201, 1222) and a transition conductor 12g. The adapter conductor 12g connects the at least one grounding wire (1201, 1222) to the shielding layer 16 . .

As shown in FIG. 3, the flexible flat cable of the present invention is applied to a perspective view of an input/output connector. The flexible flat row 10 of the present embodiment is suitable for high-frequency signals and high-current transmission requirements. As an example, the flexible flat cable 10 can be electrically connected to the paddle card 30. An output connector 20 is combined to form a cable and connector assembly.

The input/output connector 20 has a shielding case 24, a fixing frame 26, and a plurality of terminals 21 (refer to FIG. 6) disposed in the shielding case 24 and extending rearward. A holder 26 is attached to the periphery of the shield case 24 for fixing the output connector 20 to an electronic device.

The riser card 30 has a substrate 32 and a plurality of switching circuits 34 distributed on the substrate 32. The plurality of switching circuits 34 have a plurality of first pins 34a distributed on one side of the substrate 32, and a plurality of The second pins 34b are respectively disposed on the other side of the substrate 32. The first pins 34a are correspondingly connected to the wires 12 of the flexible flat cable 10; the second pins 34b are correspondingly connected to the output. The terminals 21 of the connector 20 are inserted.

Please refer to FIG. 4, which is a cross-sectional view of the flexible flat cable of the present invention. More preferably, the thickness of the first integrated power line 1208 and the second integrated power line 1215 can be made larger than the thickness of the signal line (e.g., reference numeral 1202), whereby a current greater than 2.25 amps can be transmitted.

Please refer to FIG. 5, FIG. 5A and FIG. 6 respectively, which are respectively a three-dimensional combination diagram, a front view and a top view of the flexible flat cable and the input/output connector and the adapter card. Real The input/output connector 20 of the embodiment is exemplified by a USB Type-C connector, and preferably conforms to the standard specification of the USB 3.1 interface.

As shown in FIG. 5A, the shielding case 24 has a tongue plate 210. The terminals 21 are disposed on the surface of the tongue plate 210 and extend to the rear end of the output connector 20. The terminals 21 include a plurality of upper layer terminals 21A and a plurality of lower layer terminals 21B respectively distributed on two surfaces of the tongue plate 210. The input-in connector 20 of this embodiment includes a total of twenty-four terminals 21 divided into twelve upper-layer terminals 21A and twelve lower-layer terminals 21B. The power transmission specification, wire and connector current transmission capacity standard is 5A. Up to 10G bit per second transfer rate. Therefore, the present invention can achieve the advantage that the number of the terminals 21 is larger than the number of the wires 12 by the design of the integrated power cord. More specifically, in the present embodiment, the number of the wires 12 of the flexible flat cable 10 is twenty-two, which is less than the number of the terminals 21 of the output connector 20. In other words, the width of the flexible flat cable 10 can be reduced, which is advantageous for saving space inside the electronic device.

Please refer to FIG. 3 again, and the adapter card 30 can also have a special configuration according to the above arrangement. The number of the first pins 34a of the riser card 30 is less than the number of the second pins 34b. The number of the first pins 34a is equal to the number of the wires 12, and the number of the second pins 34b is the same as the number of the terminals 21, wherein the number of the wires 12 is smaller than the number of the terminals 21. Quantity. The first pin 34a includes at least one integrated power pin 342, 343 and at least one signal pin 341. The width of the integrated power pin 342, 343 is greater than the width of the signal pin 341. The power pin 342 is correspondingly connected to the first integrated power line 1208.

Please refer to FIG. 7 , which is a configuration diagram of the definition of the flexible flat cable and the reference pin of the input and output connector. The number of the terminals 21 is 24, and the number of the wires 12 of the flexible flat cable 10 of the present invention is 22, which is less than the number of the terminals 21 that are input and output into the connector 20. One of the features of the flexible flat wire arrangement of the present embodiment is that the foot is disposed in the middle of the wires 12 (refer to the center line of FIG. 7). C) is divided into two halves and is symmetrically distributed. It is assumed that the signal lines 1211 and 1212 of the two D+ and D- are divided into two halves, and the positions of the two halves are symmetrically distributed, thereby facilitating signal transmission. For example, all the grounding wires are evenly distributed on the two halves, for example, three grounding wires 1201, 1204, and 1207 on the left side; and three grounding wires 1216, 1219, and 1222 on the right side. For another example, the signal lines of all the signal lines that are not related to the differential signal are concentrated between the two ground lines (1207, 1216) closest to the middle, and are arranged symmetrically to the left and right. From another point of view, the signal line with respect to the differential signal among the plurality of signal lines is located outside the two of the ground lines closest to the middle. The signal lines of the plurality of signal lines with respect to the differential signals include (RX1+, RX1-; RX2+, RX2-) 1220, 1221; 1206, 1205; and (TX1+, TX1-; TX2+, TX2-) 1217, 1218 ; 1203, 1202. As shown in FIG. 7, between the two grounding wires (1207, 1216) closest to the middle, including the spare wires 1210 and 1213 of the configuration channel (CC), and the non-integrated type of the power transmission (SBU1, SBU2). Power lines 1209, 1214, first and second integrated power lines 1208, 1215, and potential signal lines 1211, 1212. In addition, a grounding line is disposed on each side of each pair of signal lines in the present case, for example, two pairs of high frequency receiving differential signal lines (RX1+, RX1-; RX2+, RX2-) 1220, 1221; 1206, 1205; High-frequency transmission differential signal lines (TX1+, TX1-; TX2+, TX2-) 1217, 1218; 1203, 1202, each pair of signal lines are provided with a ground line (1201, 1222, 1204, 1219, 1207, 1216) . The above is only a preferred pin configuration of the embodiment, and the present creation is not limited thereto.

[Second embodiment]

Please refer to FIG. 8 and FIG. 9. FIG. 8 is a partial perspective view of another embodiment of the flexible flat cable of the present invention, and FIG. 9 is a configuration of another reference pin defined by the flexible flat cable and the input/output connector. Figure. The difference from the above embodiment is that the wires 13 of the flexible flat cable 10a of the embodiment further include at least one first integrated power cord 1308 and a non-integrated power cord 1316 located at the first integrated power cord 1308. One side. This embodiment has two first integrated power lines 1308, 1315. It is assumed that the non-integrated power line 1316 can transmit about 0.8 without increasing the thickness of the wire. Ampere, two first integrated power lines 1308, 1315, a total of 4 to 4.5 amps of current can be transmitted, the amount of current that can be transmitted in this embodiment is 4.8 to 5.3 amps. If you increase the thickness of the power cord, you can easily reach 5 amps or more. The width of the non-integrated power line 1316 is the same as the width of the generally unwidened wire 12, such as signal lines (eg, reference numerals 1302, 1322 of FIG. 9) or ground lines 1301, 1323. An advantage of this embodiment is that the wires of the flexible flat cable for transmitting current likewise occupy only the width of five generally unwidened wires 12, reduce the number of wires of the flexible flat cable by at least two, and reduce the flexible flat cable. The overall width (same as the above embodiment); in addition, the two first integrated power lines 1308, 1315 have the same width, and the remaining wires have the same width, so the tool for punching and cutting the wire can be simplified, and only two sets of tools are needed. . More manufacturing costs.

As shown in FIG. 9, it is a configuration diagram of the pin definition defined by another reference of the creation cable and the connector assembly. With this arrangement, the flexible flat cable 10a has twenty-three wires 13, the total number of which is still less than the number of terminals (twenty-four) that are output to the connector 20. It is assumed that the signal lines 1311 and 1312 of the two D+ and D- are divided into two halves, and the first integrated power line 1315 on the right side and the non-integrated power line 1316 are symmetric with the first integrated power line 1308 on the left side. The configuration of the feet on the second half is still roughly symmetric.

In this embodiment, when the matching current is transferred from the integrated power supply line to the grounding line, the grounding line can be configured with multiple strips or increased in thickness, that is, having a larger thickness than the signal line, thereby being capable of loading the same high current. .

[Possible effects of the examples]

This design achieves high frequency and high current transmission at a lower manufacturing cost by designing a flexible flat cable for transferring USB Type-C connectors.

At least the characteristics and functions of this creation are that the creation can achieve high-frequency and high-current transmission through flexible flat cable, and achieve high-frequency and high-current transmission functions at a lower manufacturing cost. In addition, with a smaller number of power leads, high current transmission requirements can be achieved and the overall width of the flexible flat cable can be reduced.

This creation method can avoid the difficulty of the general cable routing inside the electronic device, and can reduce the width of the emission line compared with the conventional flexible flat cable. In further comparison, the general input and output is applied to the internal application of the electronic device, usually using a riser card, and a wire connector is arranged on the riser card, and the flexible flat cable is connected by a row of wire connectors, but the application Unable to meet high frequency requirements.

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. .

10‧‧‧Flexible flat cable

12‧‧‧ wire

1201, 1222‧‧‧ Grounding wire

1202, 1221‧‧‧ signal line

1208‧‧‧First integrated power cord

1215‧‧‧Second integrated power cord

14‧‧‧Insulation

16‧‧‧Shield

S‧‧‧ spacing

Claims (9)

A flexible flat cable having one end electrically connected to an input/output connector by a riser card, the input/output connector comprising a plurality of terminals, comprising: a plurality of parallel arranged wires, wherein the wires comprise at least one a first integrated power line and a plurality of signal lines; wherein two adjacent ones of the signal lines have a spacing, the signal lines have the same width, and the width of the first integrated power line is equal to at least The double width of the signal line plus at least one of the spaces; and an insulating layer covering the wires; wherein the thickness of the first integrated power line is greater than the thickness of the signal line; wherein the flexible flat cable further comprises a The shielding layer is coated on the periphery of the insulating layer, and the wires comprise at least one grounding wire and an adapter conductor, and the switching conductor connects the at least one grounding wire to the shielding layer. The flexible flat cable of claim 1, wherein the wires further comprise a non-integrated power cord located on one side of the first integrated power cord. The flexible flat cable of claim 1, wherein the wire comprises a second integrated power line, the second integrated power line having a width greater than a width of the first integrated power line. The flexible flat cable according to claim 3, wherein a spacing between two adjacent ones of the signal lines, wherein the width of the second integrated power line is equal to three times the width of the signal line plus twice The spacing. The flexible flat cable according to claim 1, wherein the number of the terminals of the output connector is greater than the number of the wires. The flexible flat cable according to claim 1, wherein the position of the flexible flat cable is divided into two halves by the middle of the wires, and the positions of the two halves are symmetrically distributed. The flexible flat cable according to claim 1, wherein all of the ground lines are evenly distributed on the two halves. The flexible flat cable of claim 1, wherein a signal line of the plurality of signal lines with respect to the differential signal is located outside of the two of the ground lines closest to the middle. The flexible flat cable according to claim 1, wherein each of the two sides of the signal line is provided with one of the ground lines.