CN111162396B

CN111162396B - Plug connector combination

Info

Publication number: CN111162396B
Application number: CN201910012225.1A
Authority: CN
Inventors: 廖炎璋; 谭介尧
Original assignee: Bellwether Electronic Corp
Current assignee: Bellwether Electronic Corp
Priority date: 2018-11-07
Filing date: 2019-01-07
Publication date: 2022-03-15
Anticipated expiration: 2039-01-07
Also published as: CN209804985U; TWM575201U; CN111162396A; CN209963389U; CN209526309U; CN210137059U

Abstract

A plug connector assembly includes an insulative housing, a flat cable terminal set, a handle and a protector. The insulating base body is provided with a top wall, a bottom wall and a pair of side walls which are jointly surrounded to form an accommodating space inside. The flat cable type terminal set has a first flat cable, a second flat cable, and a reinforcing plate. The first flat cable and the second flat cable are respectively provided with a plurality of conductors exposed out of the front end of the insulation base body; the reinforcing plate is clamped between the first flat cable and the second flat cable, wherein the reinforcing plate is a metal plate, and the front edge of the reinforcing plate protrudes out of the front edges of the first flat cable and the second flat cable. The handle is fixed on the top wall of the insulation base body and is provided with an operating part extending upwards. The protecting member is clamped on the front edge of the reinforcing plate, and the top surface and the bottom surface of the protecting member respectively exceed the plurality of conductors of the first flat cable and the plurality of conductors of the second flat cable.

Description

Plug connector combination

Technical Field

The present invention relates to a plug connector assembly, and more particularly, to a plug connector assembly capable of being inserted into a receptacle connector and transmitting signals.

Background

Electrical connectors have been commonly used to transmit signals or power. With the development of smaller and smaller electrical connectors and the demand for faster and faster signal transmission, the conductors for transmission of electrical connectors have been designed on circuit boards, or may be referred to as gold fingers. However, the gold fingers of the circuit board are still quite costly due to complicated processing procedures and time-consuming manufacturing processes.

In another point to be considered, a cable is connected to transmit signals and power after the circuit board is completed. Even though the circuit board and the cable are designed to meet the requirement of impedance matching, the circuit board and the cable are combined, and the processed parts of the circuit board and the cable cause impedance mismatching. To improve the impedance mismatch, more ink is needed to meet the requirements of the combined media materials in terms of research and processing precision, which ultimately increases many costs.

Moreover, as the watt rate of the connected devices is higher and higher, flashover or arcing may occur during the hot-plugging process of the electrical connector, which may easily damage the components of the devices.

Disclosure of Invention

Embodiments of the present invention provide a plug connector assembly, which can effectively solve the above problems, and at least simplify the process of the conductor for transmission of the electrical connector, so as to more easily provide impedance matching.

To achieve the above-mentioned objective, an embodiment of the invention provides a plug connector assembly including an insulative housing, a flat cable type terminal set, a handle and a protection member. The insulating base body is provided with a top wall, a bottom wall and a pair of side walls, and the top wall, the bottom wall and the pair of side walls surround together to form an accommodating space inside the insulating base body. The flat cable type terminal set has a first flat cable, a second flat cable, and a reinforcing plate. The first flat cable and the second flat cable are respectively provided with a plurality of conductors exposed out of the front end of the insulation base body; the reinforcing plate is clamped between the first flat cable and the second flat cable, wherein the reinforcing plate is a metal plate, and the front edge of the reinforcing plate protrudes out of the front edges of the first flat cable and the second flat cable. The handle is fixed on the top wall of the insulation base body and is provided with an operating part extending upwards. The protective member is held on the front edge of the reinforcing plate, and the top surface and the bottom surface of the protective member respectively extend beyond the plurality of conductors of the first flat cable and the plurality of conductors of the second flat cable.

According to one embodiment of the plug connector assembly of the present invention, the length center of the reinforcing plate along the inserting direction is located behind the front edge of the opening of the insulating base.

In one embodiment of the plug connector assembly of the present invention, two sides of the reinforcing plate each protrude a positioning protruding plate, wherein an inner side surface of the insulating base body facing the accommodating space forms a displacement preventing mechanism to stop the positioning protruding plate of the reinforcing plate, so as to limit displacement of the reinforcing plate along the inserting direction; the operation part is positioned above the positioning convex plate of the reinforcing plate and extends backwards to exceed the rear end edge of the reinforcing plate.

According to one embodiment of the plug connector assembly of the present invention, a pair of grooves is respectively formed on the pair of sidewalls of the insulating base along the inserting direction, wherein the displacement-preventing mechanism of the insulating base includes a first stopper and a second stopper, the first stopper and the second stopper respectively protrude inward from the pair of sidewalls of the insulating base and are located in the pair of grooves, and the first stopper and the second stopper respectively abut against the front ends of the two positioning protruding plates.

In one embodiment of the plug connector assembly of the present invention, each of the first flat cable and the second flat cable has an insulating carrier layer, an outer shielding layer, and an inner shielding layer, the plurality of conductors are fixed to the insulating carrier layer, the outer shielding layer is attached to an outer side of the insulating carrier layer, and the inner shielding layer is attached to an inner side of the insulating carrier layer and electrically contacts with the stiffener to form an electrical circuit.

In one embodiment of the plug connector assembly of the present invention, the first flat cable and the second flat cable each have a plurality of signal wires and a plurality of non-signal wires, and the distance between the signal wires and the protecting member is greater than the distance between the non-signal wires and the protecting member.

In one embodiment of the plug connector assembly according to the present invention, the signal conductors of the first and second flat cables further form a slit and an isolation conductor, the isolation conductor is located between the protection member and the slit, and the isolation conductor is not in electrical contact with other components.

In one embodiment of the plug connector assembly of the present invention, each of the first and second flat cables has a plurality of signal conductive wires, a plurality of non-signal conductive wires, and a plurality of covering portions, and the covering portions are close to the protecting member and correspondingly cover front ends of the signal conductive wires.

In one embodiment of the plug connector assembly of the present invention, each of the conductors has a width of 0.25 to 0.3 mm, and the matched differential pair impedance is 100 ohms.

In one embodiment of the plug connector assembly of the present invention, each of the conductors has a width of 0.3 to 0.5 mm, and the matched differential pair impedance is 80 ohms.

The plug connector assembly provided by the embodiment of the invention has the beneficial effects that the conductors of the flat cable are electrically connected with the terminals of the socket connector, so that the process can be simplified and the impedance matching can be realized. The shielding properties of the flat cable facilitate the transmission of high frequency signals. In addition, the reinforcing plate and the insulating base of the flat cable type terminal group can well fix the flat cable type terminal group. The reinforcing plate has the technical effects of shielding and reinforcing the structural strength. The invention can replace the golden finger of the circuit board or the traditional terminal, is easier to process and can realize impedance matching. Moreover, the protection piece can protect the conductors of the flat cable type terminal group in the plugging process. Preferably, the distance between the signal wires and the protection member is greater than the distance between the non-signal wires and the protection member, so that a design of contact timing difference can be provided, and the wires or equipment end parts are prevented from being damaged. Thereby further increasing the safety of the equipment end parts.

For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, which is to be read in connection with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to be limiting.

Drawings

Fig. 1 is a perspective assembly view of the plug connector assembly of the present invention.

Fig. 2 is an exploded perspective view of the plug connector assembly of the present invention.

Fig. 3 is a perspective view of the insulating base and the auxiliary holding base of the present invention.

Fig. 4 is a schematic cross-sectional view of the present invention taken along line IV-IV of fig. 1.

FIG. 5 is a schematic sectional view taken along line V-V in FIG. 1.

Fig. 6 is an exploded perspective view of the flat cable type terminal set and the protection member according to the first embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view of the flat cable type terminal set and the protection member according to the first embodiment of the invention.

Fig. 8 is an exploded perspective view of a flat cable type terminal set and a protection member according to a second embodiment of the present invention.

Fig. 9 is a schematic cross-sectional view of a flat cable type terminal set and a protection member according to a second embodiment of the invention.

Detailed Description

For convenience, identical or equivalent components of the various embodiments shown in the figures have been identified with identical reference numerals. Certain terminology is used in the following description for convenience only and is not limiting. The words "left", "right", "front", "rear", "upper" and "lower" designate directions in the drawings to which reference is made. The words "forward", "forwardly", "rearward", "inside", "inwardly", "outside", "outwardly", "upwardly", "downwardly" and "downwardly" refer to directions toward and away from, respectively, the geometric center of the referenced object and designated parts thereof.

First embodiment

Please refer to fig. 1 and fig. 2, which are a perspective assembly view and an exploded view of the plug connector assembly of the present invention. The present invention provides a plug connector assembly 1, which can be inserted into a socket (not shown) along an inserting direction. The plug connector assembly 1 includes an insulating housing 10, an auxiliary holding housing 20, a flat cable type terminal set 30, a protector 40, and a handle 60.

As shown in fig. 3 and 4, the insulation base 10 forms an accommodating space 120 therein. The flat cable type terminal set 30 is held in the insulating housing 10 and has a plurality of conductors 33 exposed at the front end of the auxiliary holding housing 20. The auxiliary holding seat 20 is inserted into the accommodating space 120 from the rear end face of the insulating seat 10, so that the flat cable type terminal set 30 is fixed to the insulating seat 10, and the flat cable type terminal set 30 is prevented from moving. The flat cable of the flat cable type terminal set 30 passes through the accommodating space 120 and extends to the rear end of the insulating housing 10. The handle 60 is disposed on the top surface of the insulating housing 10 for being locked to or unlocked from the socket. The components of the plug connector assembly 1 are described in detail below.

Referring to fig. 2, the insulating base 10 has a top wall 12a, a bottom wall 12b and a pair of side walls 14, the pair of side walls 14 are respectively connected to two sides of the top wall 12a and the bottom wall 12b, and jointly surround to form the accommodating space 120. The insulative housing 10 is preferably made of an insulative material, such as plastic. The accommodating space 120 penetrates through the insulating base 10 along the inserting direction and is open at the front end and the rear end of the insulating base 10.

Referring to fig. 2 and 3, the auxiliary retaining base 20 has a main body 21 and a pair of extending walls 23. The body portion 21 has a plate shape. The pair of extension walls 23 are respectively connected to both sides of the body portion 21, and two latches 212 protrude outward from the top surface of the body portion 21. However, the number of the fixture blocks of the present invention is not limited thereto, and may be at least one, or two or more, for example. As shown in fig. 3, two engaging grooves 1230 are formed on the inner side surface of the top wall 12a of the insulating housing 10, and the number and the positions of the engaging grooves 1230 correspond to the number and the positions of the latches 212. The fastening blocks 212 are fastened in the fastening grooves 1230, so that the auxiliary retaining base 20 is fixed in the insulating base 10. Further, the top wall 12a of the insulating base 10 has a front section 121 and a rear end 123, and the thickness of the front section 121 is greater than that of the rear end 123 to form a step. The thickness of the main body 21 of the auxiliary retaining base 20 is substantially equal to the height of the drop, and the length of the main body 21 along the inserting direction is substantially equal to the length of the drop. In other words, the body portion 21 abuts on the rear end of the front step portion 121. The extension wall 23 extends downward near the bottom wall 12b of the insulative housing 10. The auxiliary holding base 20 holds the flat cable terminal set 30 in the accommodating space. The auxiliary retaining housing 20 may be made of an insulating material, such as plastic. But not limited thereto.

Referring to fig. 2, a main feature of the present invention is to use the flat cable type terminal set 30 to transmit signals or power. The flat cable type terminal set 30 has a first flat cable 30a, a second flat cable 30b, and a reinforcing plate 30 c. The Flat Cable of the present embodiment is a Flexible Flat Cable (FFC), which is a Flat Cable made of Flat copper wires and insulating materials (e.g. PET) through a precise automated production line. The first flat cable 30a and the second flat cable 30b each have a plurality of conductors 33 exposed at the front end of the insulating housing 10. The reinforcing plate 30c is sandwiched between the first flat cable 30a and the second flat cable 30b to reinforce the structural strength of the flat cable type terminal group 30. The reinforcing plate 30c is a metal plate in this embodiment, and the front edge of the reinforcing plate 30c protrudes from the front edges of the first and second

flat cables

30a and 30 b.

The reinforcing plate 30c of the present embodiment may be a metal plate, preferably, stainless steel, which can prevent signal interference between the first flat cable 30a and the second flat cable 30 b. In the present embodiment, the reinforcing plate 30c has a thickness of about 0.3 to 0.4 millimeters (mm). In the present embodiment, the material of the reinforcing plate 30c is stainless steel, and the thickness is matched to provide sufficient structural strength for the insertion and extraction of the flat cable type terminal set. In addition, the present invention can utilize the original Flexible Flat Cable (FFC) which meets the requirements of impedance matching and high frequency to be directly combined, and the mismatching caused by the combination is solved. More specifically, the width of the conductor 33 may be in the range of 0.25 to 0.5 millimeters (mm) depending on the impedance (impedance) matching requirement. For example, conductor 33 may be between 0.25 and 0.3 millimeters (mm) wide, and the Differential pair impedance (Differential pair impedance) may be matched to 100 ohms (ohm); the width of conductor 33 is between 0.3 and 0.5 millimeters (mm) and the Differential pair impedance (Differential pair impedance) may be matched to 80 ohms (ohms).

Referring to fig. 3 and fig. 4, in order to fix the flat cable type terminal set 30 in the insulating base 10, two positioning protruding

plates

325 and 326 protrude from two sides of the reinforcing plate 30 c. In addition, the inner side surface of the insulation base 10 facing the accommodating space 120 forms a displacement prevention mechanism to stop the

positioning protruding plates

325 and 326 of the reinforcing plate 30c, thereby limiting the displacement of the reinforcing plate 30c along the inserting direction. As for the displacement prevention mechanism, more specifically, as shown in fig. 4, the pair of side walls 14 of the insulation base 10 are respectively formed with a pair of grooves 140 along the insertion direction. Two of the

positioning tabs

325, 326 are located within the pair of grooves 140, respectively. The displacement preventing mechanism of the insulating base 10 includes a first stopper 142 and a second stopper 143. The first stopper 142 and the second stopper 143 respectively protrude inward from a pair of sidewalls 14 of the insulating base 10 and are located in the pair of grooves 140. As shown in fig. 4, the first stopper 142 and the second stopper 143 respectively abut against the front ends of the two

positioning protruding plates

325 and 326. The pair of extending walls 23 of the auxiliary retaining base 20 respectively abut against the rear ends of the two

positioning protruding plates

325 and 326.

As shown in fig. 4 and 6, in the present embodiment, the two

positioning protruding plates

325 and 326 at both sides of the reinforcing plate 30c have different shapes, so that the front and back sides of the flat cable type terminal set 30 can be identified in the assembling process. The front end of one of the positioning flanges 325 forms a sloped edge 3251, and the front end of the other of the positioning flanges 326 forms a straight edge 3261.

As shown in fig. 5, the present invention is also characterized in that the protecting member 40 is held at the front edge of the reinforcing plate 30c, and the top surface and the bottom surface of the protecting member 40 respectively exceed the plurality of conductors 33 of the first flat cable 30a and the plurality of conductors 33 of the second flat cable 30 b. Thereby, the conductors 33 of the flat cable type terminal set 30 can be protected from being damaged by directly scraping with the terminals of the socket connector (not shown) during the process of inserting the plug connector assembly 1 into the socket connector (not shown). The protector 40 of the present embodiment is preferably made of an insulating material, and covers the front end portions of the plurality of conductors 33.

Referring to fig. 2 and 5, the handle 60 is fixed to the top wall 12a of the insulating base 10 and has an operating portion 63 extending upward. The handle 60 includes a bottom plate 62, a top plate 61, and a recess 610, wherein the front end of the top plate 61 is connected to the bottom plate 62 in a bending manner, and the recess 610 is formed at the front end of the top plate 61 and the front end of the bottom plate 62. The handle 60 may be stamped and formed from sheet metal. The bottom plate 62 of the handle 60 is fixed to the top wall 12a of the insulative housing 10.

As shown in fig. 2, in order to fix the handle 60, the top wall 12a of the insulative housing 10 of the present embodiment forms a mounting structure 16. The mounting structure 16 includes a pair of retaining walls 161, a front retaining block 162 and a pair of rear retaining blocks 163. The front mounting block 162 is located at the front edge of the top wall 12a and extends rearwardly into the recess 610 of the handle 60 to press against the front edge of the bottom plate 62 of the handle 60. The pair of rear fixing blocks 163 are located on the top wall 12a and behind the front fixing block 162 to stop the bottom plate 62 and prevent the handle 60 from being released backward. The top plate 61 of the handle 60 extends rearward with a pair of positioning protrusions 613, and the pair of positioning protrusions 613 are stopped by the pair of stopper walls 161. The mounting structure 16 thereby limits the forward, rearward and upward displacement of the handle 60. As shown in fig. 5, the length center G of the reinforcing plate 30c along the inserting direction is located behind the front edge of the opening of the insulating housing 10. In other words, the length of the reinforcing plate 30c inside the insulation base 10 is greater than the length exposed outside the insulation base 10. The operating portion 63 is located above the

positioning flanges

325, 326 of the reinforcing plate 30c and extends rearward beyond the rear end edge of the reinforcing plate 30 c. This design may increase the stability of the reinforcement plate 30c when the reinforcement plate 30c is subjected to an external force or moment.

Referring to fig. 6 and 7, an exploded perspective view and a partial sectional view of a first embodiment of a flat cable type terminal set according to the present invention are shown. In the present embodiment, the first flat cable 30a and the second flat cable 30b of the flat cable type terminal group 30 have the same structure. The invention is not limited thereto and for example two flat cables may have a different number of conductors. The first flat cable 30a and the second flat cable 30b each have an insulating carrier layer 31, an outer shield layer 35, and an inner shield layer 37. The plurality of conductors 33 are fixed on the insulating bearing layer 31, and the outer shielding layer 35 is attached to the outer side surface of the insulating bearing layer 31 and can be used for shielding external electromagnetic interference; the inner shielding layer 37 is attached to the inner side surface of the insulating support layer 31 and can shield the electromagnetic interference of another flat cable. The inner shield layer 37 is in electrical contact with the stiffener 30c to form an electrical circuit. In a practical way, the stiffener 30c is bonded to the first flat cable 30a or the second flat cable 30b by using a conductive adhesive, and a complete shielding effect is achieved by the electrical conduction between the inner shielding layer 37 and the stiffener 30 c.

Referring to fig. 2 and 6, the protection member 40 of the present embodiment may be combined with the reinforcing plate 30c by in-mold injection molding. The flat cable type terminal set 30 is assembled, then the flat cable type terminal set 30 is placed in a mold (not shown), and then an insulating material is injected into the mold to form the protection member 40. However, the present invention is not limited thereto, and the protection member 40 may be bonded to the reinforcing plate 30c by, for example, bonding. Specifically, the protector 40 includes a leading portion 41 and a pair of protection walls 42, the protection walls 42 are connected to the upper and lower sides of the leading portion 41 to form a slit 420, and the leading portion 41 further forms a pair of guiding slopes 413. In addition, in the reinforcing plate 30c of the present embodiment, in order to reinforce the combination force with the protection member 40, a protruding piece 321 protrudes from each side of the front edge of the main plate 32, and a recess 322 is formed between the two protruding pieces 321. Further, the main plate body 32 has a plurality of connection holes 323 formed along the front end edge. Thereby, the plastic of the protector 40 is more engaged with the reinforcing plate 30c in the process of injection molding the protector 40.

Referring to fig. 7, after the reinforcing plate 30c is combined with the protecting member 40, the protecting member 40 is clamped on the front edge of the reinforcing plate 30c, and the top surface and the bottom surface of the protecting member 40 respectively exceed the plurality of conductors 33 of the first flat cable 30a and the plurality of conductors 33 of the second flat cable 30 b.

As shown in fig. 6 and 7, each of the first flat cable 30a and the second flat cable 30b has a plurality of signal wires 33s and a plurality of non-signal wires 33g, and the non-signal wires 33g are not used for transmitting signals, and include a ground or power transmission conductor. One of the features of the present embodiment is that the distance between the signal wires 33s and the protection member 40 is greater than the distance between the non-signal wires 33g and the protection member 40. For example, the distance difference is at least 0.5 mm. The main function of this design is that the non-signal wire 33g is used for power transmission or grounding, and the signal wire 33s is used for high-frequency signal transmission, so as to avoid the phenomenon of spark-over (or arc) that generates point discharge during hot insertion and damages the wire or the device end parts, therefore, the above structure provides a design of contact timing difference. In the process of pulling out the plug connector assembly 1 of the present embodiment, the signal wires 33s leave the terminals (not shown) of the receptacle connector first, and the non-signal wires 33g remain in contact with the terminals (not shown) of the receptacle connector. If there is an arc, the arc will first pass to the non-signal conductor 33g, such as the ground conductor, and not to the signal conductor 33 s.

In a practical practice of this embodiment, the signal wires 33s of the first and second

flat cables

30a and 30b further form a slit 330, a transmission section 331, and an isolation conductor 332, and the isolation conductor 332 is located between the protection member 40 and the slit 330. The width of the slit 330 along the insertion direction may be 0.1 millimeter (mm) or more, for example, by laser cutting. The above structure is useful for avoiding the timing difference design, which may cause the protection member 40 not to completely protect the signal wires 33s from the terminal impact of the mating connector. The isolation conductor 332 originally belongs to the signal wire 33s, the slit 330 is formed after laser cutting, and the isolation conductor 332 is not electrically contacted with other components. The signal conductor 33s transmits the signal only with the transmission section 331, and the length of the transmission section 331 is smaller than that of the non-signal conductor 33 g.

[ second embodiment ]

Referring to fig. 8 and 9, an exploded perspective view and a partial cross-sectional view of a second embodiment of the flat cable terminal set of the present invention are shown. The difference between the present embodiment and the first embodiment is that the first flat cable 30a and the second flat cable 30b further have a plurality of covering portions 312, and the covering portions 312 are close to the protecting member 40 and correspondingly cover the signal conducting wires 33s, thereby also making the distance between the signal conducting wires 33s and the protecting member 40 larger than the distance between the non-signal conducting wires 33g and the protecting member 40. The cover 312 may be part of the insulating carrier layer 31 and may be formed together in an automated in-line lamination process for flexible flat cables. However, the present invention is not limited to this, and the covering portion 312 may be formed by covering the front end of the signal conductor 33s with an insulating material.

In summary, the plug connector assembly provided in the embodiments of the present invention utilizes the conductors of the flat cable to electrically connect to the terminals of the receptacle connector, so as to simplify the process and achieve impedance matching. The shielding properties of the flat cable facilitate the transmission of high frequency signals. Further, the reinforcing plate 30c of the flat cable type terminal group 30 and the insulating housing 10 can fix the flat cable type terminal group 30 well. The reinforcing plate 30c is a metal plate, and has a technical effect of reinforcing the structural strength in addition to a technical effect of shielding. The invention can replace the golden finger of the circuit board or the traditional terminal, is easier to process and can realize impedance matching. Further, the protector 40 can protect the conductors of the flat cable type terminal set 30 during insertion and extraction. Preferably, the signal wires 33s are spaced from the protection member 40 by a distance greater than the distance between the non-signal wires 33g and the protection member 40, so as to provide a contact timing difference design to avoid damaging the wires or the device-side components. Thereby further increasing the safety of the equipment end parts.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, so that equivalent technical changes made by using the contents of the present specification and the drawings are included in the scope of the present invention.

Claims

1. A plug connector combination comprising:

the insulating base body is provided with a top wall, a bottom wall and a pair of side walls, and the top wall, the bottom wall and the pair of side walls surround together to form an accommodating space along the inserting direction in the insulating base body;

a flat cable type terminal set having a first flat cable, a second flat cable, and a reinforcing plate; the first flat cable and the second flat cable are respectively provided with a plurality of conductors exposed out of the front end of the insulation base body; the reinforcing plate is clamped between the first flat cable and the second flat cable, wherein the reinforcing plate is a metal plate, and the front edge of the reinforcing plate protrudes out of the front edges of the first flat cable and the second flat cable;

a handle fixed to the top wall of the insulating base and having an operating portion extending upward; and

a protector clamped to the front edge of the reinforcing plate, the protector having top and bottom surfaces that respectively extend beyond the plurality of conductors of the first flat cable and the plurality of conductors of the second flat cable; it is characterized in that the preparation method is characterized in that,

the first flat cable and the second flat cable are respectively provided with an insulating bearing layer, an outer shielding layer and an inner shielding layer, the conductors are fixed on the insulating bearing layer, the outer shielding layer is attached to the outer side face of the insulating bearing layer, and the inner shielding layer is attached to the inner side face of the insulating bearing layer and electrically contacts with the reinforcing plate to form an electric loop.

2. The plug connector assembly of claim 1, wherein a center of a length of the stiffener along the insertion direction is located behind a front edge of the opening of the insulative housing.

3. The plug connector assembly of claim 1, wherein each of two sides of the reinforcing plate has a positioning protrusion protruding outward therefrom, wherein an inner side surface of the insulative housing facing the receiving space forms a displacement preventing mechanism for stopping the positioning protrusion of the reinforcing plate, thereby limiting displacement of the reinforcing plate along the inserting direction; the operation part is positioned above the positioning convex plate of the reinforcing plate and extends backwards to exceed the rear end edge of the reinforcing plate.

4. The plug connector assembly according to claim 3, wherein the pair of sidewalls of the insulative housing are respectively formed with a pair of grooves along the inserting direction, wherein the displacement-preventing mechanism of the insulative housing includes a first stopper and a second stopper, the first stopper and the second stopper respectively protrude inward from the pair of sidewalls of the insulative housing and are located in the pair of grooves, and the first stopper and the second stopper respectively abut against front ends of the two positioning protruding plates.

5. The plug connector assembly of claim 1, wherein said first flat cable and said second flat cable each have a plurality of signal conductors and a plurality of non-signal conductors, and wherein said plurality of signal conductors are spaced from said protective member by a distance greater than said plurality of non-signal conductors.

6. The plug connector assembly of claim 5, wherein said plurality of signal conductors of said first and second flat cables further each define a slit, and an isolation conductor between said shield member and said slit, said isolation conductor not being in electrical contact with other components.

7. The plug connector assembly of claim 1, wherein said first flat cable and said second flat cable each have a plurality of signal conductors, a plurality of non-signal conductors, and a plurality of covering portions adjacent to said protective member and correspondingly covering front ends of said plurality of signal conductors.

8. The plug connector assembly of claim 1, wherein each of said conductors has a width of 0.25 to 0.3 mm and a mateable differential pair impedance of 100 ohms.

9. The plug connector assembly of claim 1, wherein each of said conductors has a width of 0.3 to 0.5 mm and a mateable differential pair impedance of 80 ohms.