Enclosed floatable shielding structure

Abstract

The present invention relates to an enclosed floatable shielding structure. The shielding structure is of a thin-wall revolving body structure with both ends being open and having a fully enclosed peripheral wall, wherein the opening at the top end is smaller than the opening at the bottom end. The shielding structure sequentially comprises, from the top end to the bottom end, a top edge, a vertical surface, an inclined surface, an arc-shaped surface and a bottom edge. The shielding structure has an axial elastic deformation capacity, so as to accommodate inter-board tolerance; the overall structure exhibits a small amount of deformation, and does not easily yield, thereby causing little impact on radio frequency performance; and the part of the shielding structure below the horizontal central plane substantially does not deform, and the bottom slippage is minimal, thereby enabling little wear and a long service life. The shielding structure is formed in one step by means of stamping, features a simple structure and easy installation, and can effectively ensure the performance stability of an inter-board radio frequency connector.

Description

Closed floating shield structure TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, in particular to a closed floating shield structure. BACKGROUND

[0002] In the current communication field, in order to meet the requirements of equipment integration, miniaturization and light weight, the application of inter-board connector is more and more widely. The inter-board RF connector is usually a coaxial structure, including an inner conductor, an insulator and a shielding structure. Since there is a certain tolerance in the board spacing, the inter-board connector is required to realize floating connection, which requires the shielding structure shell to achieve a certain amount of floating. At the same time, with the development of 5G, the use frequency of RF connector is required to be higher and higher, so the shielding effect of the shielding structure is required to be more and more strict.

[0003] There are two forms of common floating shielding structures at present:

[0004] (1) Slotted metal shell shielding

[0005] The structure of the slotted metal shielding is shown in Figure 1. This form of shielding needs to open a certain number of split slots on the shell. When the board spacing changes, the split slot part deforms, thereby realizing elastic floating contact between the boards. However, this non-fully-closed structure has poor shielding effect under high-frequency signals, low isolation, and is easy to produce RF leakage, thereby affecting the overall performance of the product. In the compression process, the split slot structure deforms greatly, which also affects the RF performance of the product; at the same time, in the compression deformation, the bottom will slip greatly, causing wear and affecting the service life of the product.

[0006] (2) Conductive rubber pad

[0007] Another form of floating shielding structure is to add a conductive rubber pad at the contact end face of the shielding structure shell. The conductive rubber pad has certain conductivity and elasticity, and can realize floating contact. However, this conductive rubber pad has poor recovery to the initial state, low service life, and its compressed shape is difficult to control, affecting the overall RF performance. In addition, the stability of the installation of this conductive rubber pad is poor, and it is easy to fail.

[0008] SUMMARY

[0009] In view of the defects of the prior art, the present application provides a closed floating shield structure.

[0010] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0011] A closed floating shield structure, the shield structure is a thin-walled rotary structure with open ends and closed periphery, which comprises a top edge, a vertical surface, an inclined surface, a circular surface and a bottom edge from top to bottom, a deformation fulcrum is located at the connection between the inclined surface and the circular surface, the shield has an axial elastic deformation amount, and the top end and the bottom end are respectively in contact with a printed board or an outer shell.

[0012] Further, the shield structure is formed by one-time stamping of metal.

[0013] Further, the top end of the shield structure has a smaller opening diameter than the bottom end.

[0014] Further, the shield structure forms a horizontal everted surface at the top edge by everted forming.

[0015] Further, the shield structure forms a top edge bead at the top edge by stamping.

[0016] Further, the shield structure forms a bottom edge bead at the bottom edge by stamping.

[0017] Further, the top end of the shield structure can be connected to the printed board or the outer shell by surface soldering, solder-free contact or through-hole soldering.

[0018] Further, the bottom end of the shield structure can be in elastic free contact with the outer shell or the printed board. Advantages:

[0019] The closed floating shield structure has the following advantages:

[0020] 1. The closed structure realizes a certain compression amount while having good high-frequency signal shielding performance compared with the traditional slotted shield.

[0021] 2. The overall structure has small deformation and stress, is not easy to yield, has less influence on radio frequency performance, is stable in performance, has a compression shape that is easy to control, has good resilience, and has a high service life compared with conductive glue.

[0022] 3. The ingenious structure design makes the horizontal center surface below not deform substantially, the bottom does not slide much, has less wear and tear, and has a long service life.

[0023] 4. The overall structure is integrally stamped, is simple in structure, easy to install, and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a slotted metal shell shield of the prior art.

[0025] Fig. 2 is a perspective view of the shield structure of the present application.

[0026] Fig. 3 is a schematic view of a sectional structure of the shielding structure of the present application;

[0027] Fig. 4 is a schematic view of a deformation process of the shielding structure of the present application

[0028] Fig. 5 is a schematic view of the present application applied in a board-to-board RF connector;

[0029] Fig. 6 is a schematic view of a through-plate welding of the shielding structure of the present application.

[0030] Reference signs: 1, shielding structure, 11, top edge, 12, vertical surface, 13, inclined surface, 14, circular arc surface, 15, bottom edge, 16, horizontal center surface, 17, deformation support point; 2, inner conductor, 3, insulator; 41, PCB board one / housing one, 42, PCB board two / housing three, 43, housing two, 44, groove, 5, through-plate. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below in combination with the drawings and specific embodiments. The orientation terms such as up, down, horizontal, vertical, top end, bottom end, etc. in the present application are relative to the positional relationship shown in the drawings, and are not an absolute limitation on the present application.

[0032] As shown in Figs. 2-4, the present embodiment provides a closed floating shielding structure, which is mainly applied in a board-to-board RF connector as an outer shielding. The shielding structure 1 is a thin-walled rotary body structure with two open ends and a closed periphery. The surface between the top end and the bottom end is continuously closed. The shielding structure sequentially comprises a top edge 11, a vertical surface 12, an inclined surface 13, a circular arc surface 14, and a bottom edge 15 from the top end to the bottom end. The circular arc surface 14 is connected to the inclined surface on one side and to the bottom edge 15 on the other side. The shielding structure 1 has an axial elastic deformation amount, and the deformation support point is located at the connection between the inclined surface 13 and the circular arc surface 14.

[0033] The shielding structure 1 is formed by one-time stamping of metal. The opening diameter at the top end is smaller than the opening diameter at the bottom end, and the outer shape is similar to a bowl with a reversed bottom (bowl bottom opening). Due to the stamping process, the connections between the vertical surface 12 and the top edge 11 and the inclined surface 13 are smoothly transitioned by circular arcs.

[0034] The shielding structure 1 forms a horizontal outwardly turned surface at the top edge 11 by outward turning, or forms a top edge curl by stamping. The shielding structure 1 forms a bottom edge curl at the bottom edge 15 by stamping.

[0035] The shielding structure 1 has an axial elastic deformation amount. As shown in FIG. 4, the shielding structure 1 is connected between the top end and the bottom end through a slope 13, and the plane where the connecting point of the slope 13 and the circular arc surface 14 is defined as a horizontal center plane 16. The circular arc surface 14 below the horizontal center plane 16 is bent downward and has a smaller radius, and the included angle with the horizontal plane is larger (referring to the obtuse included angle between the circular arc tangent at the connecting point of the circular arc surface 14 and the slope 13 and the horizontal plane), so the torque received during the pressing process is smaller. The slope 13 above the horizontal center plane 16 is longer and has a smaller included angle (acute angle) with the horizontal plane, so the torque received during the pressing process is larger. The two points form a deformation fulcrum 17, and the final deformation basically exists only at the slope 13. During compression and rebound deformation, the deformation slope 13 floats on both sides of the horizontal center plane 16 around the deformation fulcrum 17, realizing axial elastic deformation. The overall structure has small deformation, and when applied to a board-to-board RF connector, the influence on the RF performance is small, and the performance is stable.

[0036] During deformation and rebound, the vertical surface 12 above the slope 13 always remains perpendicular to the horizontal plane because the overall change of the shielding structure 1 is small. The rebound force F1 is always in the vertical direction, and the top edge 11 will not move horizontally to damage the structure (such as welding) at the top end of the shielding structure 1 and the printed board or the shell.

[0037] The bottom of the shielding structure 1 basically does not deform below the horizontal center plane 16, so compared with the slotted shielding, the bottom of the shielding structure of the present application will not have a large slip, the wear is small, and the service life is longer. Compared with the conductive adhesive, the compression shape is easy to control, the rebound is good, and the service life is high. The bottom edge 15 can be stamped into a rolled edge structure to further reduce wear and improve contact reliability.

[0038] The application of the above shielding structure in a board-to-board RF connector is shown in FIG. 5. The board-to-board RF connector is arranged between two PCBs, and includes a coaxial inner conductor 2, an insulator 3, and a shielding structure 1. The inner conductor 2 can float in the axial direction. The inner conductor 2 is externally provided with the insulator 3. The shielding structure 1 surrounds the inner conductor 2. The top end of the shielding structure 1 is connected to the PBC board one 41 (or the shell one) through surface soldering. The bottom end of the shielding structure 1 is in elastic free contact with the shell two 43, which is arranged outside the insulator 3. Alternatively, the board-to-board RF connector can not contain the shell two 43, and the bottom end of the shielding structure 1 is in elastic free contact with the PCB board two 42 (or the shell three).

[0039] Further, the printed board or the outer shell in contact with the bottom end of the shielding structure 1 is provided with an annular groove 44 for generally positioning the shielding structure 1, and the bottom end of the shielding structure 1 is arranged in the groove 44 and elastically and freely contacts the outer shell or the printed board.

[0040] Further, the top end of the shielding structure 1 is not limited to surface soldering but can be not soldered, and the non-soldering contact mode or the through-plate soldering mode is adopted, as shown in Fig. 6, and the through-plate 5 is arranged at the opening of the top end of the shielding structure when the through-plate soldering is adopted.

[0041] The shielding structure of the present application adopts a closed structure, thus having better shielding performance for high-frequency signals; the shielding structure has small overall deformation, can ensure stable radio frequency performance, and through the ingenious structure design, the top end connection of the shielding structure does not occur transverse displacement, the bottom end has small sliding displacement and small abrasion, thus ensuring reliable contact and small rebound force, meeting the integrated installation between boards, adopting the integrated stamping structure, thus having simple structure, convenient installation and low cost.

[0042] The above is only the preferred embodiment of the present application, and does not limit the present application in any form, although the present application has been disclosed as above, however, is not intended to limit the present application, any skilled person in the art, without departing from the technical solution of the present application, can make some changes or modifications of the above disclosed technical content for equivalent embodiments, but as long as the technical solution of the present application is not departed from, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, all still belong to the scope of the technical solution of the present application.

Claims

1. A closed floating shield structure, characterized by, The shielding structure (1) is a thin-walled rotary body structure with open ends and closed periphery, which comprises a top edge (11), a vertical surface (12), an inclined surface (13), a circular arc surface (14) and a bottom edge (15) from top to bottom, and has an axial elastic deformation amount, with a deformation fulcrum (17) located at the joint of the inclined surface (13) and the circular arc surface (14), and the top and bottom ends of the shielding structure (1) being used for contacting with a printed board or an outer shell, respectively.

2. A closed floating shield structure according to claim 1, wherein The shielding structure (1) is formed by one-time stamping of metal.

3. A closed floating shield structure according to claim 1, wherein The top opening diameter of the shielding structure (1) is smaller than the bottom opening diameter.

4. A closed floating shield structure according to claim 1, wherein The shielding structure (1) is formed with a horizontal outward turning surface at the top edge (11) by outward turning.

5. A closed floating shield structure according to claim 1, wherein The shielding structure (1) is formed with a top edge curl at the top edge (11) by stamping.

6. A closed floating shield structure according to claim 1, wherein The shielding structure (1) is formed with a bottom edge curl at the bottom edge (15) by stamping.

7. A closed floating shield structure according to claim 1, wherein The top end of the shielding structure (1) can be connected with a printed board or an outer shell by surface mounting welding, welding-free contact or through-plate welding.

8. A closed floating shield structure according to claim 1, wherein The bottom end of the shielding structure (1) can be in elastic free contact with an outer shell or a printed board.

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