CN110994298B

CN110994298B - Coaxial switch

Info

Publication number: CN110994298B
Application number: CN201911286826.8A
Authority: CN
Inventors: 张自财
Original assignee: Kunshan Leijiang Communication Technology Co ltd
Current assignee: Kunshan Leijiang Communication Technology Co ltd
Priority date: 2019-12-14
Filing date: 2019-12-14
Publication date: 2021-04-13
Anticipated expiration: 2039-12-14
Also published as: CN110994298A

Abstract

A coaxial switch comprises an insulating base with at least one terminal slot, a movable terminal and a fixed terminal fixed in the terminal slot, an insulating upper cover covering the insulating base, and a metal shell fixing the insulating base and the insulating upper cover into a whole, the terminal slot comprises a concave part and a support wall formed at the rear end of the concave part, the movable terminal comprises a first holding part fixed at the front end of the terminal slot, a first welding foot extending from the first holding part to the lower surface of the insulating base and an elastic arm extending from the first holding part to the rear part, the free end of the elastic arm is lapped above the supporting wall, and the static terminal comprises a second fixing part fixed at the rear end of the terminal groove, a second welding leg extending from the second fixing part to the lower surface of the insulating base and a contact arm extending from the second fixing part. The bullet nature of the movable end of the coaxial switch of the application is stable.

Description

Coaxial switch

Technical Field

The present application relates to the field of electrical connectors, and more particularly, to a coaxial switch.

Background

The coaxial switch is widely used in a mobile device for testing an antenna signal, and generally includes an upper plastic body, a lower plastic body, a movable terminal and a stationary terminal assembled in the upper plastic body and the lower plastic body, and a metal housing holding the upper plastic body and the lower plastic body together. For example, patent No. 200980100028.X of the people's republic of china discloses a coaxial switch technical scheme which is most widely applied in the prior art, and a bifurcate structure is arranged at a contact end of a moving terminal and a static terminal to be contacted with the static terminal. According to the technical scheme, various technical performances of the ultramicro coaxial switch can be realized, but the part of the movable terminal providing the elastic force needs to be bent into an arch shape, and the bending structure can generate internal stress which cannot be released, so that instability is caused. The movable terminal and the static terminal are both in a plug-in mounting structure, and the assembly process is difficult due to the small size; and, the 5G technology needs to transmit antenna signals in multiple channels, and the single-channel coaxial switch cannot meet the requirements of the 5G communication technology.

Disclosure of Invention

In view of the above, it is desirable to provide a coaxial switch with stable power at the moving end.

In order to solve the above technical problem, the present application provides a coaxial switch, including an insulating base having at least one terminal slot, a movable terminal and a stationary terminal fixed in the terminal slot, an insulating upper cover covering the insulating base, and a metal housing holding the insulating base and the insulating upper cover together, the terminal slot includes a recessed portion and a support wall formed at the rear end of the recessed portion, the movable terminal includes a first holding portion fixed at the front end of the terminal slot, a first solder pin extending from the first holding portion to the lower surface of the insulating base, and an elastic arm extending from the first holding portion to the rear, the free end of the elastic arm is lapped over the support wall, the stationary terminal includes a second holding portion fixed at the rear end of the terminal slot, a second solder pin extending from the second holding portion to the lower surface of the insulating base, and a contact arm extending from the second holding portion, the contact arm is in contact with the elastic arm in a natural state, the elastic arm is in contact with the contact arm after being pressed downwards, and the elastic arm is of a plane plate-shaped structure.

Preferably, the front end and the rear end of the terminal groove are respectively cut to form a notch, and the first welding leg and the second welding leg are respectively located at the bottom of the notch.

Preferably, the terminal groove is provided with a partition board at two lateral sides thereof, the partition board is provided with a first fixing groove and a second fixing groove at inner sides thereof near the two notches, and the first and second fixing portions are inserted into and fixed to the first and second fixing grooves, respectively.

Preferably, the fixed terminal further includes a bridging portion bent forward from the top of the second holding portion and spanning the support wall, the contact arm is formed by bending and extending downward from an end of the bridging portion, the contact arm includes a vertical portion formed by bending and extending downward from the bridging portion, bifurcated arms formed by bifurcating and extending from ends of the vertical portion toward two lateral sides, and a contact groove formed between the bifurcated arms, and the elastic arm is clamped into the contact groove for contact.

Preferably, the contact groove is wide at the bottom and small at the top, the elastic arm comprises a main body arm and an extension arm formed by extending the main body arm backwards, and edges matched with the contact groove are formed on two transverse sides of the extension arm.

Preferably, the width of the body arm is greater than the width of the extension arm, the width of the bifurcated arm is greater than the width of the bridging portion, a position of the partition plate corresponding to the contact arm is provided with a limiting groove, the contact arm is inserted into the limiting groove downwards, and the upper end of the bridging portion abuts against the lower surface of the insulating upper cover.

Preferably, the movable terminal further includes a bent portion formed by bending upwards and extending from the front end of the elastic arm and then bending reversely, the first fixing portion is formed by extending vertically downwards from the bent portion, the first solder leg is formed by bending and extending from the bottom of the first fixing portion forwards, and the elastic arm is formed by extending obliquely upwards and backwards.

Preferably, one side of the elastic arm close to the bending part is in a suspended state, and the distance between one side of the elastic arm close to the bending part and the concave part is smaller than the distance between other positions of the elastic arm and the concave part.

Preferably, the substrate is provided with two terminal grooves in the front-back direction, the partition plate is arranged between the terminal grooves, the partition plate is provided with a thimble groove corresponding to the inner side of the depressed portion, the insulating upper cover and the metal shell are integrally injection-molded, the insulating upper cover is provided with a jack communicated to the upper part of the elastic arm of the terminal groove, and the insulating upper cover is provided with a position avoiding opening corresponding to the position of the molding wall.

Preferably, the insulating base further comprises an extending portion formed on the periphery of the substrate, buckling grooves extending to the bottom of the insulating base are formed on two transverse sides of the extending portion, the metal shell comprises a cylindrical body, a covering portion formed by stretching the bottom of the cylindrical body to the periphery and covering the extending portion, and buckling pieces formed on two transverse sides of the cylindrical body, and the buckling pieces are bent inwards and buckled into the buckling grooves to fix the insulating base and the insulating upper cover into a whole.

This application coaxial switch is through set up the terminal groove that has the depressed part on insulating base's the base plate, will move the free end of end bullet nature arm and erect again in the knee wall top of depressed part rear end keeps the elastic arm is plane platelike structure, can not produce current elastic arm because bend and the unable release of accumulated stress problem. Meanwhile, the front end of the elastic arm is in a suspension state, and the first fixing part of the movable terminal and the free end of the elastic arm bear the force of downward extrusion deformation of the contact pin together, so that the elastic force can be better improved, and the mechanical deformation damage is avoided.

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:

fig. 1 is a perspective assembly view of the coaxial switch of the present application;

FIG. 2 is an exploded perspective view of the coaxial switch of the present application;

fig. 3 is a perspective view of the dielectric base of the coaxial switch of the present application;

fig. 4 is a perspective assembly view of the insulating upper cover and the metal housing of the coaxial switch of the present application;

FIG. 5 is a perspective view of the movable terminal of the coaxial switch of the present application;

fig. 6 is a perspective view of the stationary terminal of the coaxial switch of the present application;

FIG. 7 is a cross-sectional view of the coaxial switch of the present application taken along the line A-A of FIG. 1 in an initial state;

fig. 8 is a cross-sectional view of the coaxial switch of the present application taken along the line a-a of fig. 1 in an operating state.

Description of the main Components

Metal shell-10; a cylindrical body-11; molding space-12; a cover-13; a groove-14; a holding piece-15; an insulating upper cover-20; a jack-22; a position avoidance port-24; an insulating base-30; a substrate-31; terminal slot-32; a recess-321; a notch-322; a separator-323; thimble slot-324; a first fixing groove-325; a second securing slot-326; a limiting groove-327; a support wall-328; retaining wall-329; an extension-33; a retaining groove-331; a movable terminal-40; a resilient arm-41; body arm-411; an extension arm-412; -end-413; edge-414; a U-shaped bending part-42; a first holding portion-43; a first leg-44; a stationary terminal-50; a second holding portion-51; a second leg-52; a bridge-53; contact arm-54; a vertical portion-541; a bifurcated arm-542; contact groove-543.

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.

In the present application, the X direction shown in fig. 1 is the front in the front-rear direction (longitudinal direction), the Y direction is the right in the left-right direction (lateral direction), and the Z direction is the upper in the up-down direction (vertical direction).

Referring to fig. 1 and 2, the coaxial switch of the present application includes an insulating base 30 having a plurality of terminal slots 32 formed in a front-rear direction, a movable terminal 40 and a stationary terminal 50 fixed to front and rear ends of the terminal slots 32, an insulating upper cover 20 covering the insulating base 30, and a metal housing 10 holding the insulating base 30 and the insulating upper cover 20 together.

As shown in fig. 3, 7 and 8, the insulating base 30 includes a substrate 31, the terminal groove 32 opened on the substrate 31 in the front-back direction, and an extension 33 formed on the periphery of the substrate 31. The terminal groove 32 includes a recess 321, partitions 323 formed on lateral outer sides of the plurality of terminal grooves 32, and thimble grooves 324 formed on the partitions 323 on lateral sides of the terminal groove 32. Notches 322 are respectively formed in the front end and the rear end of the substrate 31, which are located in the terminal groove 32, by cutting, and first and

second fixing grooves

325, 326 are formed in the partition 323 on the two lateral sides of the notches 322 on the front end and the rear end in the vertical direction; the partition 323 at the two lateral sides of the recess 321 is opened with a limiting groove 327 in the vertical direction, and the limiting groove 327 is close to the side of the stationary terminal 50 at the rear end. Retaining walls 329 and supporting walls 328 protruding upward from the upper surface of the recess 321 are formed at the front and rear ends of the recess 321 of the terminal groove 32, respectively. A catching groove 331 is formed at a lateral outer side of the extension portion 33 toward a bottom of the base plate 31.

Referring to fig. 2, 5 and 6, the fixed terminal 50 includes a second holding portion 51 inserted into the second fixing groove 326 for fixing, a second fillet 52 bent and extended backward from the bottom of the second holding portion 51, a bridging portion 53 bent and extended forward from the top of the second holding portion 51, and a contact arm 54 formed at an end of the bridging portion 53. The contact arm 54 includes a vertical portion 541 bent and extended downward from the end of the bridge portion 53, bifurcated arms 542 bifurcated and extended from the end of the vertical portion 541 toward both lateral sides, and a contact groove 543 formed between the bifurcated arms 542. The contact groove 543 is a trumpet-shaped structure with a large bottom and a small top, the width of the branch arm 542 is greater than the width of the vertical portion 541, and the width of the second holding portion 51 is greater than the width of the bridging portion 53. The bridge portion 53 spans over the support wall 328, and the contact arm 54 is downwardly retained in the retaining groove 327.

The movable terminal 40 includes a first holding portion 43 inserted and fixed in the first fixing groove 325, a first solder fillet 44 formed by bending and extending forward from the bottom of the first holding portion 43, a bent portion 42 formed by bending and extending reversely from the top of the first holding portion 43, and an elastic arm 41 formed by extending obliquely backward and upward from the bottom of the bent portion 42. The bending portion 42 bridges over the retaining wall 329, and the elastic arm 41 extends obliquely upward from the front to the back. The elastic arm 41 includes a body arm 411, an extension arm 412 formed by extending backward from the body arm 411, and an end 413 formed at a free end of the extension 412. The extension arm 412 has a width smaller than that of the body arm 411, and the first holding portion 43 has a width larger than that of the body arm 411. The main body arm 411 is located at one side of the bending portion 42 and sinks into the recess 321, and the end 413 of the extension arm 412 is lapped on the top surface of the support wall 328. The elastic arm 41 is a planar plate-shaped structure formed by extending upwards and backwards in an inclined manner, and the elastic arm 41 is not bent, so that the influence of bending stress is avoided when an elastic force is provided. The bottom of the elastic arm 41 on the side of the bent portion 42 does not contact the surface of the concave portion 321. An edge 414 is arranged on the lateral outer side surface of the extension arm 412, and the edge 414 is matched with the contact groove 543 of the static terminal 50.

Referring to fig. 4, the insulating upper cover 20 and the metal shell 10 are integrally formed by injection molding, and the insulating upper cover 20 includes a plurality of insertion holes 22 formed above the terminal slots 32 and a position-avoiding opening 24 formed at a position corresponding to the bridging portion 53 of the static terminal 50.

The metal shell 10 includes a cylindrical body 11, a covering portion 13 formed by stretching the lower end of the cylindrical body 11 outwards and covering the upper portion of the extending portion 33, a forming space 12 formed by enclosing the cylindrical body 11 and accommodating the insulating upper cover 20, a groove 14 formed on the periphery of the cylindrical body 11 by stamping, and a retaining piece 15 formed by extending from the bottom of the cylindrical body 11 at two lateral sides. After the insulating upper cover 20 and the insulating base 30 are fastened, the fastening piece 15 is bent inward, so that the fastening piece 15 is covered under the fastening groove 331 at the bottom of the insulating base 30 to fix the insulating base 30 and the insulating upper cover 20.

Referring to fig. 1 to 8, with particular emphasis on fig. 7 and 8, when a pin is inserted into the receptacle 22, the elastic arm 41 presses the elastic arm 41 downward, so that the elastic arm 41 elastically deforms downward, and the extension arm 412 is forced to deform downward to disengage from the contact groove 543 of the stationary terminal 50, thereby achieving disconnection. The contact arm 54 of the fixed terminal 50 is retained in the retaining groove 327, and the bridging portion 53 is retained by the clearance opening 24 of the insulating upper cover 20, so that the contact arm 54 is fixed in position, and the connection state with the contact arm 54 is changed by the deformation of the elastic arm 41.

The elastic arm 41 will not be in hard contact with the concave portion 321 when deformed, so as to avoid irreversible mechanical deformation of the elastic arm 41.

When the coaxial switch is manufactured, the insulating base 30 is firstly injection molded, and meanwhile, the metal shell 10 is injection molded to form the insulating upper cover 20; then, the movable terminal 40 and the fixed terminal 50 are inserted into the first and

second fixing grooves

325, 326 of the terminal groove 32 from top to bottom, and the contact arm 54 of the fixed terminal 50 is inserted into the limiting groove 327; then, covering the metal shell 10 and the insulating upper cover 20 thereon on the insulating base 30; finally, the buckling pieces 15 of the metal shell 10 are bent inward, wrapped and clamped on the bottom surface of the buckling grooves 331 of the insulating base 30, and fixed.

In the coaxial switch of the present application, the terminal groove 32 having the recessed portion 321 is disposed on the substrate 31 of the insulating base 30, and then the free end of the elastic arm 41 of the movable terminal 40 is erected above the supporting wall 328 at the rear end of the recessed portion 321, so as to maintain the elastic arm 41 as a planar plate-shaped structure, thereby avoiding the problem that the stress accumulated in the elastic arm 41 cannot be released due to bending. Moreover, the front end of the elastic arm 41 is in a suspended state, and the first holding part 43 of the movable terminal 40 and the free end of the elastic arm 41 bear the force of downward extrusion deformation of the contact pin together, so that the elastic force can be better improved, and mechanical deformation damage can be avoided.

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 coaxial switch comprises an insulating base with at least one terminal slot, a movable terminal and a fixed terminal fixed in the terminal slot, an insulating upper cover covering the insulating base and a metal shell fixing the insulating base and the insulating upper cover into a whole, and is characterized in that the terminal slot comprises a depressed part and a support wall formed at the rear end of the depressed part, the movable terminal comprises a first fixing part fixed at the front end of the terminal slot, a first welding pin extending from the first fixing part to the lower surface of the insulating base and an elastic arm extending from the first fixing part to the rear part, the free end of the elastic arm is lapped above the support wall, the fixed terminal comprises a second fixing part fixed at the rear end of the terminal slot, a second welding pin extending from the second fixing part to the lower surface of the insulating base and a contact arm extending from the second fixing part, the contact arm is in contact with the elastic arm in a natural state, the elastic arm is disconnected from the contact arm after being pressed downwards, and the elastic arm is of a plane plate-shaped structure; the fixed terminal further comprises a bridging part which is bent forwards from the top of the second fixing part and spans the support wall, the contact arm is formed by bending and extending downwards from the end part of the bridging part, the contact arm comprises a vertical part which is formed by bending and extending downwards from the bridging part vertically, forked arms which are formed by forking and extending from the end part of the vertical part towards two transverse sides, and a contact groove which is formed between the forked arms, and the elastic arm is clamped into the contact groove for contact; the contact groove is wide at the bottom and small at the top, the elastic arm comprises a main body arm and an extension arm formed by extending the main body arm backwards, and edges matched with the contact groove are formed on the two transverse sides of the extension arm.

2. The coaxial switch of claim 1, wherein the terminal slot is cut to form a notch at each of the front and rear ends, and the first and second solder tails are located at the bottom of the notch.

3. The coaxial switch of claim 2, wherein the terminal groove is provided with a partition at both lateral sides thereof, the partition is provided with a first and a second fixing grooves at inner sides thereof near the two notches, and the first and the second holding portions are inserted into and fixed to the first and the second fixing grooves, respectively.

4. The coaxial switch of claim 3, wherein the width of the body arm is greater than the width of the extension arm, the width of the bifurcated arm is greater than the width of the bridging portion, a position of the partition plate corresponding to the contact arm is provided with a limiting groove, the contact arm is inserted downwards into the limiting groove, and the upper end of the bridging portion abuts against the lower surface of the insulating upper cover.

5. The coaxial switch of claim 4, wherein the movable terminal further comprises a bent portion formed by bending upward and extending from a front end of the elastic arm and then bending backward, the first fixing portion is formed by extending downward and vertically from the bent portion, the first solder leg is formed by bending forward and extending from a bottom of the first fixing portion, and the elastic arm is formed by extending obliquely upward and rearward.

6. The coaxial switch of claim 5, wherein the side of the spring arm adjacent to the bend is in a suspended state, and the distance from the side of the spring arm adjacent to the bend to the recess is smaller than the distance from the other positions of the spring arm to the recess.

7. The coaxial switch according to claim 6, wherein the insulating base includes a base plate, the base plate has two terminal grooves in a front-rear direction, the partition plate is disposed between the terminal grooves, the partition plate has a thimble groove corresponding to an inner side of the recessed portion, the insulating upper cover is integrally injection-molded with the metal case, the insulating upper cover has a jack hole formed therein and connected to an upper portion of the elastic arm of the terminal groove, and the insulating upper cover has a step-off port corresponding to the bridging portion.

8. The coaxial switch of claim 7, wherein the insulating base further comprises an outer extension portion formed on the outer periphery of the substrate, wherein latching grooves extending to the bottom of the insulating base are formed on two lateral sides of the outer extension portion, the metal shell comprises a cylindrical body, a covering portion formed by stretching the bottom of the cylindrical body to the outer periphery and covering the outer extension portion, and latching pieces formed on two lateral sides of the cylindrical body, and the latching pieces are bent inward and latched into the latching grooves to hold the insulating base and the insulating upper cover together.