TWM543489U - Cable connector assembly - Google Patents

Description

Cable connector assembly

The present invention relates to a cable connector assembly, and more particularly to a cable connector assembly with better shielding effect.

A conventional cable connector assembly includes a data transmission line and two connectors connected at both ends of the data transmission line. The data transmission line is formed by a plurality of wires arranged in parallel, each of the wires has a conductor at a central position, and an outer layer is coated on the periphery of the plurality of wires to relatively position and protect the wires. The role of the signal shielding between the conductor and the external signal.

However, with the development of computer technology, the data transmission speed of electronic products such as computer hard disks and mainframes is getting faster and faster, and the transmission frequency is getting higher and higher. The shielding effect of the traditional data transmission line has been unable to meet the requirements.

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

The purpose of the present invention is to provide a novel cable connector assembly which is further coated with a coating layer on the outside of the conductor of the data transmission line so that the cladding layer and the outer layer are combined. Shielding between the conductor and the external signal is achieved, which enhances the shielding effect.

To achieve the above object, the present invention provides a cable connector assembly including a flat cable and a first connector connected to one end of the flat cable, the flat cable including a plurality of wires and a periphery of the plurality of wires The outer layer, the wire includes a conductor at a central location and a cladding layer covering the periphery of the conductor; the first connector includes a first insulative housing and two first circuit boards received in the first insulative housing The flat cable is also provided with two for welding corresponding to the two first circuit boards, and each of the first circuit board is provided with a plurality of gold fingers at the front and rear ends, and the conductor of the flat cable and one end thereof The gold finger is electrically connected, and the other end of the first circuit board is received in the first insulating body, so that the mating interface of the first connector corresponds to the Mini SAS HD connector.

As a further improvement of the present invention, the first insulative housing includes a first receiving portion for receiving the first circuit board and the flat cable, and a first insulating portion covering the outside of the first receiving portion, the first A receiving slot is formed in the front end of the receiving portion for receiving the first circuit board, and a receiving slot for receiving the flat cable is disposed at the rear end. The receiving slot communicates with the first receiving cavity.

As a further improvement of the present invention, the receiving slot and the first receiving cavity are respectively disposed in the thickness direction of the first receiving portion, and are viewed in the direction in which the first circuit board is inserted, and the two receiving slots are located in the foregoing Between the two first receiving chambers.

As a further improvement of the present invention, the first receiving portion includes a top wall, a bottom wall and two left and right side walls, and the rear ends of the left and right side walls are respectively provided with ribs, and the width of the ribs in the horizontal direction gradually increases from front to back, The rib has a slanted guiding surface, and the two sides of the first insulating portion are provided with a slot for receiving the rib.

As a further improvement of the present invention, the rear end of the bottom wall of the first receiving portion is provided with a protruding portion protruding downward, and the rear end of the bottom wall of the first insulating portion is provided with a receiving hole for receiving the protruding portion.

As a further improvement of the present invention, the top of the first insulating portion is provided with a resilient arm and a limiting block on both sides of the elastic arm, and the two sides of the elastic arm are provided with an ear portion, and the two limiting blocks are both L. The type is oppositely disposed to form a limit slot for receiving the ear portion.

As a further improvement of the present invention, the flat cable includes a first wire, a second wire and a third wire arranged side by side and adjacent to each other, the first wire and the second wire forming a differential signal pair, and the third wire is a ground wire The third wire is disposed adjacent to the first wire or the second wire to space adjacent pairs of differential signal pairs.

As a further improvement of the present invention, the aforementioned cladding layer is made of an insulating material having a dielectric constant of 2.1 to 2.4.

As a further improvement of the present invention, the cable connector assembly further includes a second connector connected to the other end of the flat cable, the second connector includes a second insulative housing and the second insulative housing a second circuit board, wherein the front and rear ends of the second circuit board are respectively provided with a plurality of gold fingers, and the conductor of the flat cable is electrically connected to the gold finger of one end of the second circuit board, and the gold finger of the other end of the second circuit board protrudes beyond the foregoing The second insulative body is such that the mating interface of the aforementioned second connector corresponds to the Slimline SAS connector.

As a further improvement of the present invention, the second insulative housing includes a second receiving portion for receiving the second circuit board and the flat cable, and a second insulating portion covering the outside of the second receiving portion. One end of the second receiving portion is provided with a second receiving cavity for receiving the second circuit board, and a protruding post is protruded from the second receiving cavity, and the protruding post passes through the second circuit board and is connected to the second receiving cavity. An inner wall surface for limiting the second circuit board in the second receiving cavity.

Compared with the prior art, the cable connector assembly of the present invention can realize the conductor and the joint layer and the outer layer by applying a coating layer on the outer periphery of the conductor of the flat cable. The shielding between external signals enhances the shielding effect.

Referring to the first figure, the present invention provides a cable connector assembly 1 including a flat cable 100 and a first connector 200 and a second connector 300 connected to the ends of the flat cable 100.

Referring to the second and third figures, the foregoing flat cable 100 includes a plurality of wires 10 and a layer 16 covering the periphery of the plurality of wires 10, the wire 10 including the first wires 11 arranged side by side and adjacent to each other. The second wire 12 and the third wire 13 disposed adjacent to the first wire 11 or the second wire 12. The first wire 11 and the second wire 12 constitute a differential signal pair for transmitting a high frequency signal; the third wire 13 is a ground wire, which can be used to suppress signal interference of the differential signal to the side. The centers of the first wire 11, the second wire 12 and the third wire 13 are arranged on the same straight line, so that the overall shape of the flat cable 100 is flat, and the cross-section of the flat cable 100 is in the left and right and up and down directions. The upper structure is symmetrical.

In the embodiment, the flat cable 100 includes the differential signal pair in which the plurality of grounding wires 13 are spaced apart from each other, and the differential signal pairs are disposed side by side. The pair of differential signals and the grounding conductors 13 are designed to be spaced apart from each other, so that the grounding conductors 13 can isolate adjacent pairs of differential signals to prevent mutual interference.

The aforementioned first wire 11, second wire 12 and third wire 13 respectively have a conductor 14 at a central position and a cladding layer covering the periphery of the conductor 14.

The coating layers of the first wire 11 and the second wire 12 respectively include a first cladding layer 15 covering the periphery of the conductor 14 and a second cladding layer 17 covering the periphery of the first cladding layer 15. In the present invention, the dielectric constant of the first cladding layer 15 is lower than the dielectric constant of the second cladding layer 17. Specifically, the first cladding layer 15 is made of an insulating material having a dielectric constant of 2.1 to 2.4 to provide a better signal transmission environment for the conductor 14, reducing the propagation delay of the signal, and reducing the crosstalk between the signals to ensure the crosstalk between the signals. High-speed and efficient transmission of signals reduces signal attenuation.

The second cladding layer 17 is disposed to have a relatively high dielectric constant. Specifically, the absorbing layer is made of an absorbing material that absorbs electromagnetic waves, whereby the absorbing layer 17 can be used to absorb external electromagnetic waves. The external electromagnetic interference is suppressed, and the conductor 14 is effectively isolated from the outside to ensure high-frequency and ultra-high frequency signal transmission; in addition, the absorbing layer 17 has the properties of light weight, temperature resistance, moisture resistance, corrosion resistance, etc., and is effective The inner conductor 14 is protected to extend the service life of the flat cable 100.

In addition, in the present embodiment, since the third wire 13 is provided as a grounding wire, on the one hand, the diameter of the conductor 14 can be set to be different from the diameter of the conductor 14 of the first wire 11 and the second wire 12, that is, the aforementioned grounding. The diameter of the conductor 14 of the wire 13 can be adjusted according to the impedance matching of the differential signal, and can be larger or smaller than the diameter of the conductor 14 of the first wire 11 and the second wire 12; on the other hand, the coating of the ground wire 13 can be Provided only as a layer, the cladding is made of an insulating material to insulate the conductor 14 of the ground conductor 13 from the conductor 14 of the adjacent first conductor 11 or second conductor 12.

The outer cover layer 16 is coated on the outer sides of the first wire 11, the second wire 12 and the third wire 13 for relative positioning and protection. The outer cover layer 16 is made of a material having good weather resistance and fatigue resistance, such as a thermoplastic elastomer TPE (Thermoplastic Elastomer) material, to the inner first, second and third wires 11, 12, 13 A better protection is formed to increase the service life of the aforementioned flat cable 100.

The center-to-center spacing of the third wire 13 and the adjacent first wire 11 or the second wire 12 is the same as the center-to-center spacing of the first wire 11 and the second wire 12, and is disposed such that the first wire 11 and the second wire 12 are made The differential impedance between them is effectively reduced, and the coupling effect is enhanced to ensure long-distance transmission of high-frequency signals.

As shown in the fourth to eighth embodiments, the first connector 200 includes a first insulative housing 20 and two first circuit boards 21 received in the first insulative housing 20. The foregoing flat cable 100 is also provided with two to be soldered correspondingly to the two first circuit boards 21 described above. A plurality of gold fingers 22 are disposed on the upper and lower sides of the first circuit board 21, and the front and rear ends of the first circuit board 21 are electrically connected to the gold finger 221 of one end of the first cable board 21, and the first circuit board 21 is The other end of the gold finger 222 is received in the first insulative housing 20 such that the mating interface of the first connector 200 corresponds to the Mini SAS HD connector.

The first insulative housing 20 includes a first receiving portion 23 for receiving the first circuit board 21 and the flat cable 100 , and a first insulating portion 24 covering the outside of the first receiving portion 23 . a first receiving cavity 231 for receiving the first circuit board 21 and a receiving slot 232 for receiving the flat cable 100 at the front end of the first receiving portion 23, the receiving slot 232 and the first receiving body The chambers 231 are in communication. The receiving slot 232 and the first receiving cavity 231 are respectively disposed in the thickness direction of the first receiving portion 23, and are disposed along the first circuit board 21 in the plugging direction, and the two receiving slots 232 are located in the foregoing two The first receiving cavity 231 is disposed such that the flat cable 100 can be electrically connected to the gold fingers 22 on the upper and lower sides of the first circuit board 21 in the first receiving slot 232 and the first receiving cavity 231.

The first receiving portion 23 includes a top wall 2312, a bottom wall 2311, and two left and right side walls 2313. The rear ends of the left and right side walls 2313 are respectively provided with ribs 233. The ribs 233 are horizontally connected (ie, the first circuit board 21 is inserted). The width of the rib 233 is gradually increased from the front to the rear, so that the rib 233 has an inclined guiding surface, and the two sides of the first insulating portion 24 are provided with a slot 243 for receiving the rib 233. The first housing portion 23 and the first insulating portion 24 are defined.

The top wall 2312 of the first receiving portion 23 is provided with a recessed portion 234 which is recessed inwardly. The front side of the recessed portion 234 is provided with a first guiding portion 2341 which is inclined, and the middle portion of the first insulating portion 24 is provided. a first bump 244, the thickness of the first bump 244 in the height direction of the first insulating portion 24 gradually increases from the back to the front, so that the first bump 244 has an inclined guiding surface, thereby When the first accommodating portion 23 is assembled and fitted with the first insulating portion 24, the first bump 244 can enter the recess portion 234 and be received in the recess portion 234 under the guidance of the first guiding portion 2341. Therefore, the first housing portion 23 and the first insulating portion 24 can be further limited.

The front end of the bottom wall 2311 of the first receiving portion 23 is provided with a recess 235 which is recessed inwardly. The front side of the recess 235 is further provided with a second guiding portion 2351 which is inclined, and the first insulating portion 24 A second protrusion 245 is disposed on the inner side of the bottom wall 242. The thickness of the second protrusion 245 in the height direction of the first insulating portion 24 gradually increases from the back to the front to form an abutting surface corresponding to the notch 235. Therefore, when the first receiving portion 23 is assembled and engaged with the first insulating portion 24, the second protrusion 245 can enter the notch 235 and the notch under the guiding action of the second guiding portion 2351. The inner side wall of the 235 abuts, and then the second protrusion 245 is received in the recess 235 to further define the first receiving portion 23 and the first insulating portion 24.

A rearward protruding portion 237 is disposed at a rear end of the bottom wall 2311 of the first receiving portion 23, and a first receiving hole 247 for receiving the protruding portion 237 is defined at a rear end of the bottom wall of the first insulating portion 24.

The top wall 241 of the first insulating portion 24 is provided with a resilient arm 246 and a limiting block 248 on both sides of the elastic arm 246. The two sides of the elastic arm 246 are provided with an ear portion 249. The two limiting blocks 248 are provided. Each of the L-shaped and oppositely disposed to form a limiting slot for receiving the ear portion 249, the limiting slot is formed between the top inner sidewall of the limiting block 248 and the top wall 241 of the first insulating portion 24 So that the ear portion 249 can move up and down within the aforementioned limiting groove. The elastic arm 246 is provided with a bump 250 for facilitating the stable connection of the first connector 200 to the mating connector (not shown) during use.

As shown in the ninth to thirteenth drawings, the second connector 300 includes a second insulative housing 30 and a second circuit board 31 received in the second insulative housing 30. The upper and lower ends of the second circuit board 31 are respectively provided with a plurality of gold fingers 32, and the gold fingers 321 at one end of the second circuit board 31 are electrically connected to the conductor 14 of the flat cable 100, and the other end is electrically connected. The gold finger 322 protrudes beyond the second insulating body 30 such that the mating interface of the second connector 300 corresponds to the slimline SAS connector.

The second insulative housing 30 includes a second receiving portion 33 for receiving the second circuit board 31 and the flat cable 100 , and a second insulating portion 34 covering the outside of the second receiving portion 33 . a second receiving cavity 331 for receiving the second circuit board 31 is disposed at a rear end of the second receiving portion 33 (ie, away from the one end of the flat cable 100), and a protrusion 332 is protruded from the second receiving cavity 331. The protrusion 332 passes through the second circuit board 31 and is connected to the upper and lower inner wall surfaces of the second receiving cavity 331 to limit the second circuit board 31 to the second receiving cavity 331.

A second receiving slot 333 for receiving the flat cable 100 is disposed at a front end of the second receiving portion 33 (ie, adjacent to one end of the flat cable 100), and the second receiving slot 333 is connected to the second receiving cavity 331. Two second receiving slots 333 are disposed in the thickness direction of the second receiving portion 33, and the second receiving cavity 331 is located in the two second receiving slots 333 along the insertion direction of the second circuit board 31. Therefore, the flat cable 100 can be electrically connected to the gold fingers 32 on the upper and lower sides of the second circuit board 31 in the second receiving slot 333 and the second receiving cavity 331.

The second connector 300 further includes a resilient piece 35 disposed on the second insulating portion 34. The rear end of the elastic piece 35 is provided with a reverse extending portion 351 extending in a U-shaped reverse direction, and the front end is provided to extend to both sides. The holding portion 352. The reverse extending portion 351 includes a U-shaped portion 3511 disposed at a rear end of the elastic piece 35 and U-shaped and an extending portion 3512 extending forward from the end of the U-shaped portion 3511. The extending portion 3512 is formed in a flat shape and has a convex portion. Exceeding the protruding portion 3513 of the U-shaped portion 3511. In the embodiment, the protruding portion 3513 is provided on two sides and is disposed on two sides of the U-shaped portion 3511, and a U-shaped groove 3514 is recessed at an intermediate position of the U-shaped portion 3511.

The second insulating portion 34 is provided with a limiting portion for limiting the receiving of the reverse extending portion 351 and the holding portion 352. The limiting portion is disposed on the bottom wall 341 of the second insulating portion 34 for limitation. The recess 342 for accommodating the reverse extending portion 351 and the protrusion 343 located at the side of the recess 342 for receiving the protruding portion 3513 are disposed. The protrusions 343 are disposed in an L shape and are disposed in two. The two L-shaped protrusions 343 are oppositely disposed. The groove 342 is formed between the two L-shaped protrusions 343. The protrusions 343 are recessed. The second receiving hole 344 of the protruding portion 3513 is accommodated in the limiting position.

The two L-shaped protrusions 343 are disposed at the rear end of the bottom wall 341 of the second insulating portion 34, and the groove 342 is surrounded by a convex shape for receiving the U-shaped portion 3511 and the extending portion 3512. A limiting block 345 is further disposed between the two L-shaped protrusions 343. The limiting block 345 is received in the U-shaped groove 3514 to limit the elastic piece 35.

The retaining portion further includes a retaining block 346 disposed at a front end of the bottom wall 341 of the second insulating portion 34 for receiving the latching portion 352. The latching block 346 is also provided with two cards. The holding blocks 346 are both L-shaped and disposed opposite to limit the holding portion 352 between the inner wall of the holding block 346 and the bottom wall 341 of the second insulating portion 34. Therefore, the engaging portion 352 and the holding block 346, the reverse extending portion 351 and the recess 342, the protruding portion 3513 and the second receiving hole 344, and the limiting block 345 and the U-shaped groove 3514 cooperate with each other. The elastic piece 35 can be restrained on the bottom wall 341 of the second insulating portion 34.

A rectangular opening 3515 is defined in the extending portion 3512 of the elastic piece 35. The bottom wall 341 of the second insulating portion 34 is further provided with a resisting block 347 and a fastening block 348 arranged in the front-rear direction. The resisting block 347 is provided. And the fastening block 348 is disposed in an inclined manner, so that after the elastic piece 35 and the second insulating portion 34 are assembled, the abutting block 347 abuts against the end of the extending portion 3512, and the fastening block 348 is fastened to the foregoing In the opening 3515.

Referring to FIG. 14 , the conductor 14 at one end of the flat cable 100 is electrically connected to the gold finger 221 of the first circuit board 21 , and the conductor 14 at the other end is electrically connected to the gold finger 321 of the second circuit board 31 . The connection is made to realize signal transmission between the first connector 200 and the second connector 300. In the embodiment, the flat cable 100 is provided with two layers so as to be electrically connected to the gold fingers 22 and 32 on the upper and lower sides of the first circuit board 21 and the second circuit board 31.

In this embodiment, the second connector 300 is a slimline SAS connector. Of course, in other embodiments, the second connector may also be a SATA 7PIN or Mini SAS connector or other connector, as long as it can be flat with the foregoing. The cable 100 is soldered and fixed, and then the signal transmission between the first connector 200 and the second connector 300 is implemented, which is not limited herein.

In summary, the cable connector assembly 1 of the present invention can be realized by coating a coating layer 15 on the outer side of the conductor 14 of the flat cable 100, thereby achieving the cooperation of the cladding layer 15 and the outer layer 16. The shielding between the conductor 14 and the external signal enhances the shielding effect.

It is to be understood that the equivalent changes to the present invention made by the teachings of the present invention should be included in the scope of the present invention.

1‧‧‧Cable connector assembly
100‧‧‧flat cable
10‧‧‧ wire
11‧‧‧First wire
12‧‧‧Second wire
13‧‧‧ Third wire
14‧‧‧Conductor
15‧‧‧First cladding
16‧‧‧Outer layer
17‧‧‧Second coating
200‧‧‧First connector
20‧‧‧First Insulation Body
21‧‧‧First board
22, 221, 222‧ ‧ gold fingers
23‧‧‧First Housing Department
231‧‧‧First containment chamber
2311‧‧‧ bottom wall
2312‧‧‧ top wall
2313‧‧‧ Sidewall
232‧‧‧storage trough
233‧‧‧ ribs
234‧‧‧Depression
2341‧‧‧First Guidance
235‧‧‧ notch
2351‧‧‧Second guidance
237‧‧‧diffuse
24‧‧‧First insulation
241‧‧‧ top wall
242‧‧‧ bottom wall
243‧‧‧ slotting
244‧‧‧First bump
245‧‧‧second bump
246‧‧‧Flexible arm
247‧‧‧First receiving hole
248‧‧‧Limited blocks
249‧‧ Ears
250‧‧‧Bumps
300‧‧‧Second connector
30‧‧‧Second insulation body
31‧‧‧Second circuit board
32, 321, 322‧‧‧ Gold Fingers
33‧‧‧ Second Housing Department
331‧‧‧Second containment chamber
332‧‧‧Bump
333‧‧‧Second holding trough
34‧‧‧Second insulation
341‧‧‧ bottom wall
342‧‧‧ Groove
343‧‧‧
344‧‧‧Second receiving hole
345‧‧‧Limited blocks
346‧‧‧Card block
347‧‧‧Resistance block
348‧‧‧ Snap block
35‧‧‧Shrap
351‧‧‧Reverse extension
3511‧‧‧U-shaped department
3512‧‧‧Extension
3513‧‧‧diffuse
3514‧‧‧U-shaped slot
3515‧‧‧ openings
352‧‧‧Keeping Department

The first figure is a perspective view of the cable connector assembly of the present invention. The second figure is a perspective view of the flat cable in the first figure. The third figure is a schematic cross-sectional view of the flat cable shown in the second figure. The fourth figure is a perspective view of the first connector in the first figure. The fifth figure is an exploded view of the first connector shown in the fourth figure. The sixth figure is another perspective view of the first housing portion in the fifth figure. The seventh drawing is a perspective view of another perspective view of the first housing portion shown in the sixth figure. The eighth figure is another perspective view of the first insulating portion in the fifth figure. The ninth diagram is a perspective view of the second connector in the first figure. The tenth figure is an exploded view of the second connector shown in the ninth diagram. The eleventh figure is another perspective view of the second housing portion in the tenth figure. The twelfth figure is another perspective view of the shrapnel in the tenth figure. The thirteenth diagram is another perspective view of the second insulating portion in the tenth diagram. Figure 14 is a schematic view showing the state in which the flat cable is electrically connected to the first circuit board and the second circuit board.

1‧‧‧Cable connector assembly

100‧‧‧flat cable

200‧‧‧First connector

300‧‧‧Second connector

Claims (10)

A cable connector assembly includes a flat cable and a first connector connected to one end of the flat cable, wherein the flat cable includes a plurality of wires and a layer covering the periphery of the plurality of wires, wherein the wires are included a conductor at a central location and a cladding layer covering the periphery of the conductor; the first connector includes a first insulative housing and two first circuit boards received in the first insulative housing, and the flat cable is also provided Two of the first circuit boards are soldered correspondingly to each of the two first circuit boards, and a plurality of gold fingers are disposed on the front and rear ends of each of the first circuit boards, and the conductors of the flat cable are electrically connected to the gold fingers of one end thereof. The gold finger at the other end of the first circuit board is received in the first insulating body such that the mating interface of the first connector corresponds to the Mini SAS HD connector. The cable connector assembly of claim 1, wherein the first insulative housing includes a first receiving portion for receiving the first circuit board and the flat cable, and is covered by the first receiving body. a first insulating portion on the outer side of the first receiving portion, a first receiving cavity for receiving the first circuit board, and a receiving groove at the rear end for receiving the flat cable, the receiving slot and the first A receiving cavity is connected. The cable connector assembly of claim 2, wherein the receiving groove and the first receiving cavity are respectively disposed in the thickness direction of the first receiving portion, and are inserted along the first circuit board. In view of the above, the two receiving slots are located between the two first receiving cavities. The cable connector assembly of claim 2, wherein the first receiving portion comprises a top wall, a bottom wall and left and right side walls, and the rear ends of the left and right side walls are provided with ribs, the ribs being horizontal The width of the rib is gradually increased from the front to the rear, so that the rib has a slanted guiding surface, and the two sides of the first insulating portion are provided with a slot for receiving the rib. The cable connector assembly of claim 4, wherein the rear end of the bottom wall of the first receiving portion is provided with a downwardly projecting protruding portion, and the rear end of the bottom wall of the first insulating portion is open for The receiving hole of the protruding portion is accommodated. The cable connector assembly of claim 2, wherein the top of the first insulating portion is provided with a resilient arm and a limiting block on both sides of the elastic arm, and the two sides of the elastic arm are provided with an ear portion. The two limiting blocks are L-shaped and disposed oppositely to form a limiting slot for receiving the ear portion. The cable connector assembly of claim 1, wherein the flat cable comprises a first wire, a second wire and a third wire arranged side by side and adjacent to each other, wherein the first wire and the second wire form a difference For the signal pair, the third wire is a ground wire, and the third wire is disposed adjacent to the first wire or the second wire to space adjacent pairs of differential signal pairs. The cable connector assembly of claim 1, wherein the cladding layer is made of an insulating material having a dielectric constant of 2.1 to 2.4. The cable connector assembly of claim 1, wherein the cable connector assembly further includes a second connector coupled to the other end of the flat cable, the second connector including a second insulative housing and a second circuit board housed in the second insulating body, wherein the front and rear ends of the second circuit board are respectively provided with a plurality of gold fingers, and the conductor of the flat cable is electrically connected to the gold finger of one end thereof, and the second circuit The gold finger at the other end of the board protrudes beyond the second insulating body such that the mating interface of the second connector corresponds to the Slimline SAS connector. The cable connector assembly of claim 9, wherein the second insulative housing includes a second receiving portion for receiving the second circuit board and the flat cable, and is covered by the second receiving portion. a second insulating portion on the outer side of the second receiving portion, a second receiving cavity for receiving the second circuit board is opened at one end of the second receiving portion, a protruding post is protruded from the second receiving cavity, and the protruding post passes through the second The circuit board is connected to the upper inner wall surface of the second receiving cavity to limit the second circuit board to the second receiving cavity.