CN211062918U

CN211062918U - Board-to-board radio frequency plug

Info

Publication number: CN211062918U
Application number: CN201921985995.6U
Authority: CN
Inventors: 张自财
Original assignee: Kunshan Leijiang Communication Technology Co ltd
Current assignee: Kunshan Leijiang Communication Technology Co ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-07-21
Anticipated expiration: 2029-11-18

Abstract

A board-to-board radio frequency plug comprises an insulating base body, a plurality of plug terminals and a forming block, wherein a plurality of terminal grooves are formed in the front direction and the rear direction of the insulating base body, the plug terminals are arranged in the terminal grooves, and the forming block is formed on the insulating base body and used for fixing the plug terminals in the terminal grooves. This application board can effectively reduce the manufacturing degree of difficulty of product to the board-like radio frequency plug.

Description

Board-to-board radio frequency plug

Technical Field

The present application relates to the field of rf connectors, and more particularly, to a board-to-board rf plug.

Background

A PCB of an existing mobile phone generally has a radio frequency connector connected to a coaxial cable to transmit radio frequency signals, such as antenna signals and high frequency signals between different boards;

in the 5G communication era, multi-antenna transmission is required, and the traditional single-channel radio frequency connector cannot meet the requirement; in the existing alternative scheme, a technical scheme for realizing multi-channel transmission of antenna signals by adopting a board-to-board connector appears, and one of the technical problems to be solved by the scheme is the shielding problem of radio frequency signals. The patent No. 201921357079.8 of the people's republic of china discloses a board-to-board radio frequency plug, a socket and a connector assembly, wherein the radio frequency plug comprises a plug terminal provided with an elastic contact, an insulating body for molding the plug terminal into a whole and a shielding shell coated outside the insulating body, because the terminal spacing of a board-to-board connector is smaller and smaller, the periphery of the elastic contact is required to be a cavity and cannot be filled with plastic, otherwise the elastic contact is disabled, for example, the board-to-board plug with the spacing of 0.35mm selects a board with the thickness of 0.06mm for satisfying all functions, but the board with the thickness of 0.06mm has insufficient strength and cannot bear the pressing force of a plug end process, but an in-mold injection molding process is required, but the one-time injection molding process has the following difficulties: 1. die part crush damage terminal: the elastic contact of the plug terminal cannot wrap plastic, the plastic needs to be sealed in an important mode during injection molding, the terminal needs to be pressed and limited by a mold part, the space is closed to prevent glue overflow, the dimensional accuracy is too high, and the plug terminal is scratched when the terminal is pressed and pressed by the mold part; 2. the mould part is too thin: the clearance between the terminal and the plastic is only 0.05mm, the thickness of the die part is only 0.045mm, the processing is difficult, and the die part is easy to damage when in use.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a plate-to-plate rf plug that facilitates in-mold injection molding of the plug terminals.

In order to solve the technical problem, the application provides a board-to-board radio frequency plug, which comprises an insulating base body, a plurality of plug terminals and a forming block, wherein the insulating base body is provided with a plurality of terminal grooves in the front direction and the back direction, the plug terminals are arranged in the terminal grooves, and the forming block is formed on the insulating base body and used for fixing the plug terminals in the terminal grooves.

Preferably, the insulating base body includes a body base, a terminal block formed at the rear end of the body base, and a filling groove penetrating the body base from top to bottom at the rear end of the body base, the molding block is molded at the position of the filling groove, and the terminal groove extends from the front end of the body base to the terminal block from the rear end.

Preferably, the filling groove is formed with a plurality of connecting strips in the front-rear direction, the connecting strips are used as a part of the terminal groove, the lower part of the filling groove is recessed upwards to form a holding bottom groove, the molding block comprises a filling bottom formed by filling the holding bottom groove, a filling column filled with the filling groove upwards from the filling bottom, and a step part extending upwards from the filling column and protruding out of the body base, the front end of the body base is further protruded upwards to form a protruding part, and a matching space is formed between the step part and the protruding part.

Preferably, the front and rear ends of the filling groove are respectively formed with an interval boss in an upward protruding manner, the interval bosses separate the terminal grooves, and the plug terminal comprises a holding part clamped between the interval bosses, a connecting part formed by extending from the back of the holding part and a contact elastic arm formed by extending from the front of the holding part.

Preferably, the left and right sides of the terminal groove at the protruding part of the body base are provided with spacers, the contact elastic arm is separated by the spacers, and the terminal groove is formed by downward sinking of the body base and the terminal block.

Preferably, the plug terminal includes a plurality of signal terminals and a ground terminal for spacing the signal terminals, a connecting portion of the signal terminal extends to above the terminal block, a connecting portion of the ground terminal extends backward to behind the terminal block, the forming block further includes an isolating block formed by extending backward from the step portion, the isolating block is formed on the step portion and located above the ground terminal, and the isolating block spaces the connecting portion of the signal terminal.

Preferably, the insulating base body further includes mating portions formed on both lateral sides of the terminal block, concave portions formed by relative depressions on both lateral sides of the body base, and a platform portion formed on the outer edge of the front end of the body base, and a clamping block is formed on the periphery of the platform portion in a protruding manner.

Preferably, the plug further includes a shielding shell coated outside the insulating base body and a coaxial cable welded to the connecting portion of the signal terminal, the shielding shell includes a side wall coated outside the insulating base body in the transverse direction, a front end wall, a substrate coated at the bottom of the insulating base body by bending from the front end wall, and a rear end wall formed by bending upwards from the rear end of the substrate, the coaxial cable includes a central conductor, an inner insulating layer coated outside the central conductor, a braid coated outside the inner insulating layer, and an outer insulating layer coated outside the braid, the central conductor is welded to the connecting portion of the signal terminal, the braid is located between the rear end wall and the terminal block, and the braid is fixed by a conductive adhesive and is electrically connected to the substrate and the rear end wall.

The application board forms an insulating base body provided with a terminal groove independently for a plate-to-plate radio frequency plug, then fixes a plug terminal in the terminal groove and forms a forming block through injection molding again, and the forming block tightly fixes the plug terminal in a terminal groove 2 of the insulating base body; compared with the prior technical scheme that the plug terminal is directly formed into the insulating body in one step, the defects that when the existing plug terminal is molded in a mold, the periphery of the contact elastic arm is limited by space, the difficulty of forming a terminal groove is high, the yield is low and the mold is easy to damage are overcome.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

example one

Fig. 1 is a perspective assembly view of a one-board-to-one-board radio frequency plug according to an embodiment;

fig. 2 is an exploded perspective view of a one-board-to-one-board rf plug according to an embodiment;

FIG. 3 is an exploded perspective view of an alternate embodiment of a board-to-board RF plug;

fig. 4 is a perspective view of a shield case of a one-board-to-one-board radio frequency plug of an embodiment;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 6 is a sectional view taken along the line B-B shown in fig. 1.

Example two

Fig. 7 is a perspective view of an insulating base of a two-board-to-board rf plug according to an embodiment;

FIG. 8 is a cross-sectional view taken along the line C-C shown in FIG. 7;

fig. 9 is a perspective view of the plug terminal of the two-board-to-board rf plug of the embodiment assembled on the insulating housing;

FIG. 10 is a perspective view of an exemplary two-piece molding block;

FIG. 11 is a perspective view of a two-panel RF plug of an embodiment with the shield shell removed;

fig. 12 is a sectional view taken along the dotted line D-D shown in fig. 11.

Description of the main Components

A shielding shell-10; a substrate-11; a front end wall-12; a sidewall-13; an inner convex part-132; a fixing sheet-14; a first space-15; a card slot-151; -a second space-16; a rear end wall-17; a wire slot-171; an insulating base body-20; a body base-21; a platform portion-211; a terminal slot-212; a projection-213; a mating space-214; a cartridge-215; a spacer-216; an inner recess-22; filling the groove-221; a connecting strip-222; a spacing boss-223; a holding bottom groove-224; a terminal block-23; a mating portion-231; splicing space-30; a plug terminal-40; a signal terminal-41; a ground terminal-42; a holding portion-43; a contact spring arm-44; connecting part-45; conductive adhesive-50; molding block-60; a step-61; a filling part-62; filling the bottom-621; a packed column-622; an isolation block-63; slot-64.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments.

This application all uses figure 1 as the standard about the definition of direction to coaxial line C's extending direction is fore-and-aft direction (and the cable end is the rear end), with plug and socket's plug direction is upper and lower direction, with the perpendicular to fore-and-aft direction and upper and lower direction are transverse direction (left and right sides direction).

Example one

Referring to fig. 1 to 3, a plate-to-plate rf plug according to the present invention includes a

plug body

20, 60, a plurality of plug terminals 40 formed in the

plug body

20, 60, a shielding shell 10 covering the plug body 20, a plug space 30 formed between the plug body 20 and the shielding shell 10, a plurality of coaxial lines C connected to the plug terminals 40, and a conductive adhesive 50.

The coaxial cable C includes a central conductor C1, an inner insulating layer C2 wrapped around the central conductor C1, a braid C3 wrapped around the inner insulating layer C2, and an outer insulating layer C4 wrapped around the braid C3.

The plug body includes an insulating housing 20 and a molding block 60 molded on the insulating housing 20 to fix the plug terminal 40.

The insulation base body 20 includes a body base 21, a terminal block 23 formed at the rear end of the body base 21, mating portions 231 formed at both lateral sides of the terminal block 23, an inner concave portion 22 formed by lateral depression, a terrace portion 211 formed at the outer edge of the front end of the body base 21, and a plurality of terminal grooves 212 formed on the body base 21. A plurality of clamping blocks 215 are formed by extending the platform part 211 outwards; the front end of the body base 21 is also protruded upwards to form a protrusion 213, and a matching space 214 is formed between the protrusion 213 and the forming block 60.

The plug terminal 40 includes a plurality of signal terminals 41 and a plurality of ground terminals 42 for spacing the signal terminals 41 from each other, and each plug terminal includes a terminal body 43, a contact spring arm 44 formed by bending the front end of the terminal body 43 in the opposite direction, and a connection portion 45 formed at the rear end of the terminal body 43. The connecting portion 45 of the signal terminal 41 extends to the terminal block 23 and is exposed to the upper surface of the terminal block 23 to be welded to the central conductor C1 of the coaxial cable C on the upper surface of the terminal block 23. The connecting portion 45 of the ground terminal 42 is bent downward and then extends rearward in parallel to the rear end of the terminal block 23. The horizontal position of the connection portion 45 of the ground terminal 42 is lower than that of the connection portion 45 of the signal terminal 41. The contact spring arm 44 is bent reversely to form a dog-shaped rear leg structure, and the contact spring arm 44 is suspended in the terminal groove 212.

After the insulating base body 20 is molded, the plug terminal 40 is inserted into the terminal groove 212 from top to bottom, and then the plug terminal 40 and the insulating base body 20 are injection molded to form the molding block 60. The insulating base body 20 is formed with a filling groove 221 in the vertical direction, and a plurality of connecting strips 222 are disposed in the filling groove 221. When the molding block 60 is injection molded, the filling groove 221 is filled with plastic to form a filling portion 62 and protrudes upward to form a step portion 61, and the mating space 214 is located between the protruding portion 213 and the step portion 61. The bottom surface of the filling part 62 is flush with the bottom surface of the insulating housing 20, and the step part 61 further extends forward to form a plurality of isolation blocks 63 separating the terminal block 23.

In specific implementation, the insulating base 20 and the forming block 60 are formed by injection molding once, and at this time, the plug terminal 40 needs to be formed by injection molding in a mold once. Alternatively, the plug terminal 40 is assembled to the plug body in a plug-end manner.

Referring to fig. 1 to 6, and with particular reference to fig. 4, the shielding shell 10 is used for shielding a high-frequency signal transmitted by the plug terminal 40 of the plug. The shielding shell 10 includes a substrate 11, a front end wall 12 formed by bending and extending upward from the front end of the substrate 11, two side walls 13 formed by bending and vertically bending backward from the front end wall 12, and a rear end wall 17 formed by bending upward from the rear end of the substrate 11. The two side walls 13 include inner convex portions 132 bent from free ends of the two side walls 13 toward opposite inner sides and clamped at lateral outer sides of the inner concave portions 22, fixed tail portions 133 extending from free ends of the inner convex portions 132 and located at outer sides of the mating portion 231, and first covering portions 135 bent inward and perpendicularly from upper ends of the fixed tail portions 133 and covering top surfaces of the mating portion 231. The shielding shell 10 further includes fixing pieces 14 bent upward from two lateral sides of the substrate 11 and formed outside the fixing tails 133, and ribs 134 stamped and formed on the two side walls 13. The fixing piece 14 includes vertical portions 141 located outside the two side walls 13 to support the two side walls 13, and second covering portions 142 bent inward from the top ends of the vertical portions 141 at the fixing tail portions 133 and clamped on the upper side of the first covering portion 135. The shielding case 10 has a first space 15 formed at a front end thereof for accommodating the body base 21 and a second space 16 formed at a rear end thereof for covering the mating portion 23 and the coaxial line C, and the first space 15 and the second space 16 are arranged in parallel at front and rear ends with the inner protrusion 132 as a boundary. The ribs 134 are disposed on the two side walls 13 at the position of the first space 15, and are formed by punching from the outer sides of the two side walls 13 to the inside to form a protruding structure protruding from the first space 15. A plurality of slots 151 are formed in the bottom of the two side walls 13 and the front end wall 12 within the range of the first space 15 for holding the latch 215 of the insulating housing 20. The upper end of the rear end wall 17 is provided with a plurality of wire grooves 171 for limiting the plurality of coaxial wires C.

When assembling the coaxial cable, the outer insulating layers C4 of the coaxial cables C are fixed in the wire groove 171, and the central conductor C1 is pressed against the soldering portion 45 of the signal terminal 41 on the terminal block 23. Conductive adhesive 50 is sprayed to the periphery of braid C3 of coaxial cable C by a dispenser, so that braid C3 and connecting portion 45 of ground terminal 42 are bonded to substrate 11 and rear end wall 17 of shield shell 10 located in second space 16, and rear end wall 17 can prevent conductive adhesive 50 from overflowing to form a glue groove for accommodating conductive adhesive 50 at the rear end of second space 16. This allows the braid C3 of the coaxial wire C and the connection portion 45 of the ground terminal 42 to be grounded. Conductive adhesive 50 chooses for use UV conductive glue, the point gum machine is the automatic point gum machine of injection valve, the injection valve point is glued and is glued for non-contact play, current injection valve point gum machine minimum nozzle is diameter 0.10mm, can be accurate spray the position of demand with glue, adjustment glue viscosity, can be in the time that glue solidifies the position of accuse glue, stop the short circuit, the product yield is high, UV conductive glue solidifies after receiving ultraviolet irradiation, can once accomplish the point in the integrated point gum machine of advancing of ultraviolet irradiation equipment and glue the solidification, need not the transfer station, and therefore, the production capacity is improved.

The assembly process of the plate-to-plate radio frequency plug is as follows:

the shielding housing 10 is formed by stamping, when stamping for the first time, the substrate 11 and the front end wall 12 are in an unfolded state, at this time, the plug bodies 20 and 60 and the inner plug terminals 40 thereof are clamped into the lower ends of the side walls 13, the clamping blocks 215 are clamped into the clamping grooves 151 at the lower parts of the side walls 13 and the front end wall 12, the first coating portion 135 is located on the top surface of the mating portion 231, and the inner convex portions 132 are clamped in the inner concave portions 22 at the two lateral sides of the insulating base body 20; the substrate 11 is vertically bent to cover the lower surface of the insulating base 20, and then the second covering portion 142 is bent to cover the first covering portion 135, at this time, the rear end wall 17 is located below the first covering portion 135 to support the first covering portion 135; clamping the coaxial line C into the wire groove 171, and welding the connecting part 45 of the central conductor C1 and the signal terminal 41 by using a Harper welding process; the conductive paste 50 is formed by the above-described dispensing operation to ground the connection portion 45 between the braid C3 and the ground terminal 42.

The board-to-board radio frequency plug of the first embodiment of the application is formed by bending the rear end wall 17 upwards vertically at the rear end of the substrate 11, the rear end wall 17 is sealed to prevent the conductive adhesive 50 from overflowing, and the connection portion 45 of the braid C3 and the grounding terminal 42 is fixed and electrically connected to the substrate 11 and the rear end wall 17 through the conductive adhesive 50, so that the problem that the high-frequency performance is influenced by the deformation of the coaxial line C caused by the overhigh temperature in the traditional clamping upper and lower iron sheet welding process is avoided.

Example two

In the second embodiment of the present application, the forming structure and the manufacturing method of the plug terminal 40, the insulating base 20 and the forming block 60 are mainly described in detail.

Referring to fig. 2, 7 and 8, the terminal groove 212 of the insulating base 20 extends from the protrusion 213 to the terminal block 23, a spacer 216 is disposed between the terminal groove 212 and the protrusion 213, and the spacer 216 separates the terminal groove 212 into a space for deformation of the contact spring arm 44. The terminal groove 212 is recessed downward at the position of the body base 21 and the terminal block 23. The terminal groove 212 is formed with two spaced bosses 223 at both lateral sides of the position of the filling groove 221, the spaced bosses 223 are used for applying a certain force to the holding portion 43 of the plug terminal 40 assembled in the terminal groove 212, and the spaced bosses 223 are respectively provided with two rows in the front-rear direction, respectively located at both longitudinal ends of the filling groove 221. The connection bar 222 crosses the filling groove 221 as a part of the terminal groove 212. The filling groove 221 is formed with a holding bottom groove 224 recessed upward at the bottom of the body base 21, and the holding bottom groove 224 is located below the connecting bar 222.

As shown in fig. 10 to 12, the filling portion 62 of the molding block 60 includes a filling bottom 621 filling the holding bottom 224 and a filling pillar 622 extending upward from the filling bottom 621 and connecting the step portion 61, wherein the filling pillar 622 fills the filling groove 221 between the connecting strips 222. A plurality of slot holes 64 matching with the terminal slots 212 are formed between the filling columns 622, and the slot holes 64 and the terminal slots 212 together form a coating and fixing structure of the plug terminal 40. The spacing boss 223 is formed on the bottom side of the step part 61 to increase the combining force between the insulation seat body 20 and the forming block 60, and the filling bottom 621 enables the forming block 60 and the insulation seat body 20 to be an integral structure. The distance that the ground terminal 42 extends backward is longer, and the isolation block 63 extends backward and covers above the corresponding ground terminal 42 to fix the ground terminal 42, so as to avoid the problem that the holding part is loosened due to the existence of too many exposed parts above the holding part 43.

The manufacturing method of the board-to-board radio frequency plug of the second embodiment includes the following steps:

s10, injection molding the insulation base body 20;

the specific structural features of the insulating base 20 have been described above, and are not described herein again;

s20, assembling the plug terminal 40 into the terminal groove 212 of the insulation base 20;

at this time, the contact elastic arm 44 of the plug terminal 40 is located in the terminal groove 212 of the protrusion 213, and the contact elastic arm 44 is separated by the spacer 216; the holding portion 43 is clamped between the spaced bosses 223 on the left and right sides of the terminal groove 212; the connecting portion 45 of the signal terminal 41 extends into the terminal groove 212 on the terminal block 23, and the connecting portion 45 of the ground terminal 42 extends rearward beyond the rear of the terminal block 23;

s30, injection molding the insulating base 20 with the plug terminal 40 again to form a molding block 60 for holding the plug terminal 40 therein;

in this step, the molding block 60 includes a filling portion 62 filling the filling groove 221 and a step portion 61 extending upward from the filling portion 62 to the rear of the protrusion 213, and the step portion 61 and the protrusion 213 form the mating space 214 therebetween.

In the second embodiment of the present application, the insulating base 20 having the terminal groove 212 is separately formed, then the plug terminal 40 is fixed in the terminal groove 212 and is injection-molded again to form the molding block 60, and the molding block 60 tightly fixes the plug terminal 40 in the terminal groove 212 of the insulating base 20; compared with the prior technical scheme that the plug terminal 40 is directly formed into the insulating body in one step, the defects that the difficulty of forming the terminal groove 212 is high, the yield is low and the mold is easy to damage due to the fact that the periphery of the contact elastic arm 44 is limited by the space when the existing plug terminal is molded in the mold are overcome.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A board-to-board radio frequency plug is characterized by comprising an insulating base body, a plurality of plug terminals and a forming block, wherein the insulating base body is provided with a plurality of terminal grooves in the front and back direction, the plug terminals are arranged in the terminal grooves, and the forming block is formed on the insulating base body so as to fix the plug terminals in the terminal grooves.

2. The board-to-board radio frequency plug of claim 1, wherein the insulative housing includes a body base, a terminal block formed at a rear end of the body base, and a filling groove extending up and down through the body base at the rear end of the body base, the molding block being molded at a position of the filling groove, the terminal groove extending rearward from a front end of the body base to the terminal block.

3. The board-to-board radio frequency plug according to claim 2, wherein the filling groove is formed with a plurality of connecting strips in a front-to-back direction, the connecting strips are a part of the terminal groove, a holding bottom groove is formed by upwardly recessing a lower portion of the filling groove, the molding block includes a filling bottom portion formed by filling the holding bottom groove, a filling pillar filling the filling groove upwardly from the filling bottom portion, and a step portion extending upwardly from the filling pillar and protruding out of the body base, the front end of the body base is further formed with a protruding portion upwardly protruding, and a mating space is formed between the step portion and the protruding portion.

4. The board-to-board radio frequency plug of claim 3, wherein the filling slots are formed with spaced bosses protruding upward at front and rear ends thereof, the spaced bosses separating the terminal slots, the plug terminal includes a holding portion clamped between the spaced bosses, a connecting portion extending rearward from the holding portion, and a contact spring arm extending forward from the holding portion.

5. The board-to-board radio frequency plug of claim 4, wherein a spacer is provided at both left and right sides of the terminal groove at the protruding portion of the body base, the contact spring arm is partitioned by the spacer, and the terminal groove is formed by being depressed downward from the body base and the terminal block.

6. The board-to-board radio frequency plug of claim 5, wherein the plug terminal includes a plurality of signal terminals and a ground terminal for spacing the signal terminals apart, the connecting portions of the signal terminals extend above the terminal block, the connecting portions of the ground terminal extend rearward beyond the rear of the terminal block, the forming block further includes a spacer block formed to extend rearward from the stepped portion, the spacer block being formed at the stepped portion above the ground terminal, the spacer block spacing the connecting portions of the signal terminals apart.

7. The board-to-board rf plug according to claim 6, wherein the insulative housing further comprises mating portions formed at both lateral sides of the terminal block, concave portions formed by being depressed from both lateral sides of the body base, and a terrace portion formed at an outer edge of a front end of the body base, and a latch is formed at an outer circumference of the terrace portion in a protruding manner.

8. The board-to-board radio frequency plug of claim 7, wherein the plug further comprises a shielding shell covering the outside of the housing and a coaxial wire soldered to the connecting portion of the signal terminal, the shielding shell comprises a side wall covering the transverse outer side of the insulating base body, a front end wall, a substrate bent from the front end wall and covering the bottom of the insulating base body, and a rear end wall formed by upward bending from the rear end of the substrate, the coaxial line comprises a central conductor, an inner insulating layer coated outside the central conductor, a braid layer coated outside the inner insulating layer and an outer insulating layer coated outside the braid layer, the central conductor is welded to the connecting portion of the signal terminal, the braid is positioned between the rear end wall and the terminal block, the woven layer is fixed and electrically connected to the substrate and the rear end wall through conductive adhesive.