Mobile terminal and electric connection method

Abstract

The invention provides a mobile terminal and an electric connection method, the mobile terminal comprises an elastic sheet, a conductive lubricating layer and a first metal structural member, and the conductive lubricating layer is located on a first surface of the first metal structural member. The first end of the elastic piece abuts against the first surface of the first metal structural part, and the elastic piece is electrically connected with the first metal structural part. The conductive lubricating layer comprises conductive particles and a lubricant, the conductive lubricating layer is arranged to reduce PIM of electrical connection between the elastic piece and the first metal structural part, the abutting force between the elastic piece and the first metal structural part can be designed to be small, and the strength requirement of the first metal structural part is low. In addition, the number of the elastic pieces can be increased to achieve multi-point electric connection, and the stability of electric connection between the elastic pieces and the first metal structural part is improved. The elastic piece is not prone to scratching the first metal structural part, and scraps are not prone to being generated. The arrangement of the conductive lubricating layer has no requirement for the thickness of the first metal structural member, so that the thickness of the first metal structural member can be reduced, and the thinning of the mobile terminal is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of electronic devices, and particularly to a mobile terminal and an electrical connection method. Background Art

[0002] With the development of human society, mobile terminals are widely used in various fields. A mobile terminal includes many structures, and there are often scenarios where electrical connections are made between different structures, and the effect of the electrical connection is likely to have a great impact on the operation of the mobile terminal.

[0003] For the electrical connection between different structures, a relatively common connection method is to use a spring piece connection. One structure includes a spring piece, and the spring piece abuts against another structure to achieve electrical connection between the two. In order to improve the signal transmission effect between the two structures, reducing passive intermodulation (PIM) is beneficial to improving the signal transmission effect. Especially for the spring pieces used for antenna feeding or grounding of mobile terminals, the requirements for low PIM characteristics are more stringent. Summary of the Invention

[0004] The present application provides a mobile terminal and an electrical connection method, which reduce the PIM of the electrical connection between the spring piece and the first metal structure member, reduce the thickness of the first metal structure member, and improve the electrical connection effect between the spring piece and the first metal structure member.

[0005] In a first aspect, the present application provides a mobile terminal. The mobile terminal includes a spring piece, a conductive lubricating layer, and a first metal structure member. Among them, the conductive lubricating layer is located on the first surface of the first metal structure member, and this first surface is the side surface of the first metal structure member facing the spring piece. The above-mentioned spring piece includes a first end and a second end that are opposite to each other. The first end of the spring piece abuts against the first surface of the first metal structure member, and the spring piece is electrically connected to the first metal structure member. The above-mentioned conductive lubricating layer includes conductive particles and a lubricant. By setting the conductive lubricating layer, the PIM of the electrical connection between the spring piece and the first metal structure member can be reduced. Therefore, the abutting force between the spring piece and the first metal structure member can be designed to be smaller, the pressure of the spring piece on the first metal structure member is smaller, so that the strength requirement for the above-mentioned first metal structure member of the mobile terminal is lower, and the selection of the first metal structure member is more flexible. The number of spring pieces can also be increased according to requirements to achieve multi-point electrical connection and improve the electrical connection stability between the spring piece and the first metal structure member. In addition, since the abutting force between the spring piece and the first metal structure member is smaller, the spring piece is not easy to scratch the first metal structure member and is not easy to generate debris, which is beneficial to further reducing the PIM. Setting the conductive lubricating layer on the surface of the first metal structure member has no requirement for the thickness of the first metal structure member. Therefore, the thickness of the first metal structure member can be reduced to facilitate the thinning of the mobile terminal.

[0006] In an alternative technical solution, the conductive particles in the above-mentioned conductive lubricating layer include at least one of silver powder, silver flakes, and silver-coated aluminum. Metallic silver has good electrical conductivity and a relatively low cost.

[0007] In an alternative technical solution, the lubricant in the above-mentioned conductive lubricating layer includes at least one of resin, silicone oil, and paraffin wax, so that the conductive lubricating layer has good lubricity.

[0008] The above-mentioned first metal structural member may include an aluminum alloy structural member or a magnesium alloy structural member. The structural members of the above two materials are relatively soft, relatively easy to form oxides, and are easily scratched. By providing a conductive lubricating layer on the first surface of the first metal structural member, the interfacial friction between the elastic sheet and the first metal structural member can be reduced, and the protection effect on the first metal structural member can be improved.

[0009] In a technical solution, the above-mentioned mobile terminal further includes a second metal structural member. The second end of the elastic sheet is connected to the second metal structural member, and the second metal structural member is electrically connected to the first metal structural member through the elastic sheet. The PIM between the elastic sheet and the first metal structural member is small and stable, and the electrical connection effect between the elastic sheet and the first metal structural member is good and reliable. Furthermore, a stable electrical connection between the first metal structural member and the second metal structural member is achieved, and the effect and stability of electrical signal transmission between the two are improved.

[0010] Specifically, the above-mentioned elastic sheet is used to bear the pressure of extrusion between the first metal structural member and the second metal structural member, and the pressure borne by the elastic sheet is less than or equal to 0.5 N. The pressure between the elastic sheet and the first metal structural member is small and stable, and the strength requirement for the first metal structural member is relatively low, which allows the first metal structural member to be designed thinner. In addition, a plurality of elastic sheets can be provided to achieve the electrical connection between the first metal structural member and the second metal structural member, so as to improve the connection effect between the first metal structural member and the second metal structural member.

[0011] In a specific technical solution, the above-mentioned mobile terminal further includes a circuit board, and the second metal structural member is at least a part of the circuit board. The above-mentioned second metal structure may be a metal pin or a metal layer on the circuit board and other structural members.

[0012] The volume resistivity of the above-mentioned conductive lubricating layer is less than or equal to 0.2 ohm·cm, so that the impedance of the electrical connection between the elastic sheet and the first metal structural member is small, the PIM is reduced, and the electrical connection effect is improved.

[0013] When specifically setting the above-mentioned conductive lubricating layer, the thickness of the conductive lubricating layer is greater than or equal to 10 μm. If the thickness of the conductive lubricating layer is less than 10 μm, it is difficult to ensure the lubrication effect, and the effect of reducing and maintaining the stability of PIM is poor. Therefore, this solution can improve the effect of reducing PIM in the present application.

[0014] In a specific technical solution, the above-mentioned first metal structural member is used as an antenna radiator. By using the reliable connection between the elastic sheet and the first metal structural member, the electrical connection between the antenna radiator and other structures can be achieved, and then the reliable connection between the elastic sheet and the first metal structural member is used to realize signal transmission, and the signal transmission effect is better.

[0015] The above-mentioned elastic sheet can be used to feed power or ground the above-mentioned antenna radiator. In a technical solution, the above-mentioned elastic sheet is used for feeding power. Specifically, the second end of the elastic sheet is connected to a power feeding structural member, and the power feeding signal transmission quality is better.

[0016] In another technical solution, the above-mentioned elastic sheet is used for grounding. Specifically, the second end of the elastic sheet is connected to a grounding structural member. Then the grounding effect of the antenna is better.

[0017] The above-mentioned first metal structural member may further include the middle frame of the mobile terminal or the camera decorative member. When the first metal structural member is the middle frame of the mobile terminal, the middle frame can be set to be relatively thin and light, which is beneficial to improving the thinning degree of the mobile terminal.

[0018] In a second aspect, the present application also provides an electrical connection method, which is applied to a mobile terminal, and the mobile terminal includes a first metal structural member and an elastic sheet. The above-mentioned electrical connection method includes: setting a conductive lubricating layer on the first surface of the first metal structural member, and the conductive lubricating layer includes conductive particles and a lubricant; setting the first end of the elastic sheet to abut against the first surface of the first metal structural member, wherein the elastic sheet is electrically connected to the first metal structural member. The PIM of the elastic sheet and the first metal structural member connected by this method is lower, and the abutting force between the elastic sheet and the first metal structural member can be designed to be smaller, so the pressure on the first metal structural member is smaller, making the strength requirement of the above-mentioned first metal structural member of the mobile terminal lower, and the selection of the first metal structural member is more flexible. In addition, since the abutting force between a single elastic sheet and the first metal structural member is smaller, the number of elastic sheets can be increased according to requirements to achieve multi-point electrical connection and improve the electrical connection stability between the two structural members. In addition, since the abutting force between the elastic sheet and the first metal structural member is smaller, the elastic sheet is not easy to scratch the first metal structural member and is not easy to generate debris, which is beneficial to further reducing the PIM. Setting a conductive lubricating layer on the surface of the first metal structural member has no requirement for the thickness of the first metal structural member, so the thickness of the first metal structural member can be thinned to facilitate the thinning of the mobile terminal.

[0019] When specifically setting the above-mentioned conductive lubricating layer, the volume resistivity of the conductive lubricating layer is less than or equal to 0.2 ohm.cm. Thereby, the impedance of the electrical connection between the elastic sheet and the first metal structural member is smaller, reducing the PIM and improving the electrical connection effect.

[0020] The above-mentioned electrical connection method further includes: setting the thickness of the conductive lubricating layer to be greater than or equal to 10 μm. If the thickness of the conductive lubricating layer is less than 10 μm, it is difficult to ensure the lubrication effect, and the effect of reducing PIM and maintaining the stability of PIM is poor. The thicker the thickness of the above-mentioned conductive lubricating layer, the better the lubrication effect, but the cost will also increase accordingly.

[0021] Furthermore, the above-mentioned mobile terminal further includes a second metal structural member, and the above-mentioned electrical connection method further includes: setting the second end of the elastic piece to be connected to the second metal structural member, wherein the second metal structural member is electrically connected to the first metal structural member through the elastic piece. A stable electrical connection between the first metal structural member and the second metal structural member is achieved, and the effect and stability of electrical signal transmission between the two are improved.

[0022] The above-mentioned electrical connection method further includes: squeezing the elastic piece through the first metal structural member and the second metal structural member, wherein the pressure of the first metal structural member and the second metal structural member squeezing the elastic piece is less than or equal to 0.5 N. The pressure between the elastic piece and the first metal structural member is small and stable, making the first metal structural member designed thinner. In addition, more elastic pieces can be set to achieve the electrical connection between the first metal structural member and the second metal structural member, so as to improve the connection effect between the first metal structural member and the second metal structural member.

[0023] In one technical solution, the above-mentioned mobile terminal further includes a circuit board, and the second metal structural member is at least a part of the circuit board. The conductive structure can be in any form such as metal pins or metal layers. Other electronic devices or electronic devices can also be connected to the circuit board, so that the above-mentioned electronic devices or electronic devices can be electrically connected to the first metal structural member through the elastic piece, and the electrical connection effect is relatively reliable and stable, and the signal transmission effect between the electronic devices or electronic devices and the first metal structural member is better. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the connection between an elastic piece and a metal structural member in the prior art;

[0025] Figure 2 It is a schematic structural diagram of the connection between an elastic piece and a metal structural member in the prior art;

[0026] Figure 3 It is a schematic structural diagram of a mobile terminal in an embodiment of the present application;

[0027] Figure 4 It is a schematic structural diagram of the connection between an elastic piece and a metal structural member in an embodiment of the present application;

[0028] Figure 5 It is a schematic structural diagram of a mobile terminal in an embodiment of the present application;

[0029] Figure 6 This is a schematic flowchart of the electrical connection method in the embodiments of the present application.

[0030] Reference signs:

[0031] 010 - Mobile terminal;

[0032] 011 - Frame;

[0033] 013 - Cover plate;

[0034] 015 - Display screen / module;

[0035] 017 - Printed circuit board;

[0036] 019 - Middle frame;

[0037] 021 - Rear cover;

[0038] 1 - Metal structural member;

[0039] 11 - Gold-plated sheet;

[0040] 12 - Laser engraving area;

[0041] 2 - Elastic sheet;

[0042] 3 - Conductive lubricating layer;

[0043] 4 - Second metal structural member;

[0044] 5 - Camera housing. Detailed implementation manners

[0045] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0046] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above", "said", "this", and "one" are also intended to include the form "one or more", unless clearly indicated to the contrary in the context.

[0047] Reference to "one embodiment" or "specific embodiment" etc. described in this specification means that a specific feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0048] To facilitate the understanding of the mobile terminal and the electrical connection method provided by the embodiments of the present application, the following first introduces its application scenarios. During the operation of the mobile terminal, electrical connections between different structures are often required. A relatively common connection method is the elastic sheet connection. One end of the elastic sheet is connected to one structure, and the other end abuts against a metal structural member, thereby realizing the electrical connection between the above-mentioned one structure and the metal structural member. In a specific embodiment, the type of the above-mentioned one structure is not limited. For example, it can be any structure that needs to be electrically connected, such as a circuit board, an electronic device, or an antenna radiator. The method of realizing electrical connection by abutting the elastic sheet against the metal structural member is relatively simple and convenient for installation and assembly. Specifically, the abutment between the elastic sheet and the metal structural member is a point-to-surface abutment. The point where the elastic sheet abuts against the metal structural member can slide on the surface of the metal structural member, still maintaining the electrical connection between the elastic sheet and the metal structural member, and can absorb a certain amount of movement space. When transmitting electrical signals between the elastic sheet and the metal structural member, reducing PIM is beneficial to improving the signal transmission effect. Therefore, those skilled in the art have provided some solutions and ideas for reducing the PIM of the connection between the elastic sheet and the metal structural member.

[0049] PIM is the result of non-linearity, metal-to-metal contact, and material characteristics leading to the non-linear characteristics of typical linear passive transmission lines and components. PIM can be generated in various radio frequency components, such as connectors, adapters, cables, combiners, splitters, couplers, taps, attenuators, terminators, antennas, and wire-to-board interconnects. When two or more signal components of different frequencies interact at a non-linear connection and generate distortion products through mixing, PIM is generated. PIM becomes a problem when the transmitted distortion products are reflected back to a sensitive receiver and are within the receiving frequency band, or when the distortion products are transmitted and received by a nearby communication system vulnerable to specific distortion products.

[0050] Figure 1 A schematic structural diagram of the connection between an elastic sheet and a metal structural member in the prior art is shown in Figure 1 As shown, in a prior art, a gold-plated sheet 11 is welded on the surface of a metal structural member 1, and the elastic sheet 2 abuts against the gold-plated sheet 11 to reduce PIM and improve the effect of electrical connection. However, the thickness of the gold-plated sheet 11 is usually about 0.1 mm, which is relatively thin. In order to weld the gold-plated sheet 11 on the surface of the metal structural member 1, the thickness of the metal structural member 1 is usually relatively thick, such as at least 0.5 mm, etc., resulting in a larger overall thickness of the machine and making it difficult to reduce the overall thickness of the machine. In addition, the cost of this solution is also relatively high, which is not conducive to reducing the cost of the mobile terminal.

[0051] Figure 2 A schematic structural diagram of the connection between an elastic sheet and a metal structural member in the prior art is shown in Figure 2As shown, in an existing technology, laser engraving is performed on the surface of a metal structural member 1, and the elastic piece 2 abuts against the laser-engraved area 12 after the metal structural member 1 is laser-engraved. In order to meet the requirements of the overall machine PIM characteristics, the abutting force between the elastic piece 2 and the metal structural member 1 is relatively large, which is not conducive to the overall machine design. In addition, with the relative shaking between the elastic piece 2 and the metal structural member 1, the elastic piece 2 will slide on the surface of the metal structural member 1, easily wearing the metal structural member 1 to form debris, resulting in the deterioration of resistance and PIM characteristics. Especially for metal structural members 1 made of materials such as aluminum alloy structural members that are relatively soft and prone to oxidation.

[0052] Therefore, the present application provides a mobile terminal and an electrical connection method. The connection method between the elastic piece and the metal structural member in the mobile terminal improves the PIM of the connection between the elastic piece and the metal structural member of the mobile terminal, reduces the thickness of the metal structural member, reduces the elastic force between the elastic piece and the metal structure, and improves the structural characteristics of the overall machine.

[0053] The mobile terminal in the embodiments of the present application can specifically have various selections. For example, it can include any mobile terminal such as a straight phone, a folding phone, a multi-fold mobile phone form, a tablet computer, or a smart screen.

[0054] Figure 3 For a schematic structural diagram of the mobile terminal in the embodiments of the present application, as Figure 3 shown, taking the mobile terminal as a mobile phone as an example, the mobile terminal 010 may include: a cover 013, a display screen / module 015, a printed circuit board (PCB) 017, a middle frame 019, and a rear cover 021. It should be understood that in some embodiments, the cover 013 may be a cover glass, or may be replaced with a cover made of other materials, such as a cover made of ultra-thin glass material, a cover made of PET (Polyethylene terephthalate) material, etc.

[0055] Among them, the cover 013 can be arranged closely against the display screen 015, mainly playing a role in protecting the display screen 015 and preventing dust.

[0056] In one embodiment, the display screen 015 may include a liquid crystal display panel (LCD), a light emitting diode (LED) display panel, or an organic light-emitting diode (OLED) display panel, etc. The present application does not limit this.

[0057] The middle frame 019 mainly serves as the support for the whole device. Figure 3 As shown in the figure, the PCB 017 is disposed between the middle frame 019 and the rear cover 021. It should be understood that in one embodiment, the PCB 017 can also be disposed between the middle frame 019 and the display screen 015, and the present application does not limit this. Among them, the printed circuit board PCB 017 can adopt a flame-retardant material (FR-4) dielectric board, or a Rogers dielectric board, or a hybrid dielectric board of Rogers and FR-4, etc. Here, FR-4 is a code for a flame-retardant material grade, and the Rogers dielectric board is a high-frequency board. Electronic components, such as radio frequency chips, etc., are carried on the PCB 017.

[0058] The mobile terminal 010 may further include a battery (not shown in the figure). The battery can be disposed between the middle frame 019 and the rear cover 021, or can be disposed between the middle frame 019 and the display screen 015, and the present application does not limit this. In some embodiments, the PCB 017 is divided into a main board and a daughter board, and the battery can be disposed between the main board and the daughter board. Among them, the main board can be disposed between the upper edge of the middle frame 019 and the battery, and the daughter board can be disposed between the lower edge of the middle frame 019 and the battery.

[0059] The mobile terminal 010 may further include a frame 011, and the frame 011 can be formed of a conductive material such as metal. The frame 011 can be disposed between the display screen 015 and the rear cover 021 and extend circumferentially around the periphery of the mobile terminal 010. The frame 011 can have four sides surrounding the display screen 015 to help fix the display screen 015. In one implementation, the frame 011 made of a metal material can be directly used as the metal frame of the mobile terminal 010 to form the appearance of a metal frame, which is suitable for metal industrial design (ID). In another implementation, the outer surface of the frame 011 can also be a non-metal material, such as a plastic frame, to form the appearance of a non-metal frame, which is suitable for non-metal ID.

[0060] The middle frame 019 may include a frame 011. The middle frame 019 including the frame 011, as an integral part, can support the electronic devices in the whole machine. The cover plate 013 and the rear cover 021 are respectively covered along the upper and lower edges of the frame to form the housing of the mobile terminal. Or, the frame 011 may not be regarded as a part of the middle frame 019. In one embodiment, the frame 011 may be connected to the middle frame 019 and integrally formed. In another embodiment, the frame 011 may include a protruding member extending inward to be connected to the middle frame 019, for example, connected by a spring piece, a screw, welding, etc. In one embodiment, the cover plate 013, the rear cover 021, the frame 011, and the middle frame 019 may be collectively referred to as the housing of the mobile terminal 010. It should be understood that the "housing" may be used to refer to part or all of any one of the cover plate 013, the rear cover 021, the frame 011, or the middle frame 019, or refer to part or all of any combination of the cover plate 013, the rear cover 021, the frame 011, or the middle frame 019.

[0061] The rear cover 021 may be a rear cover made of a metal material; it may also be a rear cover made of a non-conductive material, such as a glass rear cover, a plastic rear cover and other non-metal rear covers; it may also be a rear cover made of both a conductive material and a non-conductive material.

[0062] In one embodiment, the rear cover 021 including a conductive material may replace the middle frame 019 and, as an integral part with the frame 011, support the electronic devices in the whole machine.

[0063] In one embodiment, the conductive part in the middle frame 019 and / or the rear cover 021 may be used as the reference ground of the mobile terminal 010. Among them, the frame 011 and the PCB 017 of the mobile terminal can be grounded by being electrically connected to the middle frame 019.

[0064] In one embodiment, the frame 011 can at least partially serve as an antenna radiator to receive / transmit radio frequency signals. There may be a gap between this part of the frame serving as the radiator and other parts of the middle frame 019 or between this part of the frame and the middle frame 019, so as to ensure that the antenna radiator has a good radiation environment. In one embodiment, apertures may be provided near this part of the frame serving as the antenna radiator. In one embodiment, the apertures may include apertures provided inside the mobile terminal 010, for example, apertures that are not visible from the outer surface of the mobile terminal 010. In one embodiment, the internal apertures may be formed by any one of the middle frame, the battery, the circuit board, the rear cover, the display screen, and other internal conductive components or formed by a plurality of them together. For example, the internal apertures may be formed by the structural components of the middle frame. In one embodiment, the apertures may further include slits / slots / openings provided on the frame 011. In one embodiment, the slit / slot / opening on the frame 011 may be a break formed on the frame, and the frame 011 is divided into two parts without a direct connection relationship at this break. In one embodiment, the apertures may further include slits / slots / openings provided on the rear cover 021 or the display screen 015. In one embodiment, the rear cover 021 includes a conductive material, and the apertures provided at the conductive material can communicate with the slits or breaks of the frame to form continuous apertures on the outer surface of the mobile terminal 010.

[0065] In one embodiment, the frame 011 includes a protruding member extending inward for connecting with other parts of the middle frame 019 or for connecting with the middle frame 019 (in one embodiment, it can also be integrally formed). In one embodiment, the protruding member includes a conductive material and can also be used to receive a feeding signal or connect to the ground plane, so that the corresponding part of the frame can receive / transmit radio frequency signals.

[0066] In one embodiment, the antenna of the mobile terminal 010 can also be provided inside the frame 011. The frame 011 includes a non-conductive material. The antenna radiator can be located inside the mobile terminal 010 and extend along the frame 011, or the antenna radiator can be at least partially embedded in the non-conductive material of the frame. In one embodiment, the antenna radiator is disposed close to the non-conductive material of the frame 011 to minimize the volume occupied by the antenna radiator and be closer to the outside of the mobile terminal 010 to achieve a better signal transmission effect. It should be noted that the antenna radiator being disposed close to the frame 011 means that the antenna radiator can be disposed closely against the frame 011 or be disposed close to the frame 011. For example, there can be a certain small gap between the antenna radiator and the frame 011.

[0067] In one embodiment, the antenna of the mobile terminal 010 can also be provided inside the housing, such as a bracket antenna ( Figure 3(not shown). There may be a gap between the antenna disposed inside the housing and other conductive components inside the housing, so as to ensure that the antenna radiator has a good radiation environment. In one embodiment, an aperture may be provided near the antenna radiator. In one embodiment, the aperture may include an aperture disposed inside the mobile terminal 010, for example, an aperture invisible from the outer surface of the mobile terminal 010. In one embodiment, the internal aperture may be formed by any one of a frame, a middle frame, a battery, a circuit board, a rear cover, a display screen, and other internal conductive components or formed by a plurality of them together. For example, the internal aperture may be formed by a structural component of the middle frame. In one embodiment, the aperture may further include a slit / slot / open hole provided on the frame 011. In one embodiment, the slit / slot / open hole on the frame 011 may be a break formed on the frame, and the frame 011 is divided into two parts without a direct connection relationship at the break. In one embodiment, the aperture may further include a slit / slot / open hole provided on the rear cover 021 or the display screen 15. In one embodiment, the rear cover 021 includes a conductive material, and the aperture provided at the conductive material may communicate with the slit or break of the frame to form a continuous aperture on the outer surface of the mobile terminal 010. In one embodiment, the aperture on the rear cover 021 or the display screen may also be used to place other devices, such as a camera, and / or a sensor, and / or a microphone, and / or a speaker, etc.

[0068] Figure 3 Only some components included in the mobile terminal 010 are schematically shown, and the actual shapes, actual sizes, and actual structures of these components are not limited by Figure 3 defined.

[0069] Figure 4 This is a schematic structural diagram of the connection between the shrapnel and the metal structural member in the embodiment of the present application, as Figure 4As shown in the figure, the mobile terminal in the embodiment of the present application includes a first metal structure member 1, a shrapnel 2, and a conductive lubricating layer 3. Among them, the conductive lubricating layer 3 is located on the first surface of the first metal structure member 1. This first surface is the surface of the first metal structure member 1 facing the shrapnel side. The above-mentioned shrapnel 2 abuts against the first surface of the first metal structure member 1, realizing the electrical connection between the shrapnel 2 and the first metal structure member 1. Specifically, the abutment between the above-mentioned shrapnel 2 and the first metal structure member 1 is a point-to-plane abutment, and the above-mentioned shrapnel 2 passes through the conductive lubricating layer 3 and abuts against the first metal structure member 1. The above-mentioned conductive lubricating layer 3 includes conductive particles and lubricants, and the above-mentioned conductive particles and lubricants are mixed to form the conductive lubricating layer 3. The conductive particles in the conductive lubricating layer 3 have good conductivity, increasing the coupling capacitance and reducing the arc, which is beneficial to improving the electrical connection effect between the shrapnel 2 and the first metal structure member 1. The lubricants in the above-mentioned conductive lubricating layer 3 have good lubrication effects, reducing the interfacial friction between the shrapnel 2 and the first metal structure member 1, making it easier for the shrapnel 2 to slide on the first surface of the first metal structure member 1 without easily scratching the first metal structure member 1, and thus not easily generating debris and other impurities, making the resistance of the connection between the shrapnel 2 and the first metal structure member 1 relatively stable, so as to reduce the PIM of the electrical connection between the shrapnel 2 and the first metal structure member 1.

[0070] In the technical solution of the present application, the PIM of the electrical connection between the shrapnel 2 and the first metal structure member 1 is relatively low. Therefore, the abutting force between the shrapnel 2 and the first metal structure member 1 can be designed to be relatively small, so the pressure of the shrapnel 2 on the first metal structure member 1 is relatively small, making the strength requirement of the above-mentioned first metal structure member 1 of the mobile terminal relatively low, and the selection of the first metal structure member 1 is relatively flexible. In addition, since the abutting force between a single shrapnel 2 and the first metal structure member 1 is relatively small, the number of shrapnel 2 can be increased according to requirements to achieve multi-point electrical connection and improve the electrical connection stability between the shrapnel 2 and the first metal structure member 1. In addition, since the abutting force between the shrapnel 2 and the first metal structure member 1 is relatively small, the shrapnel 2 is not easily scratched on the first metal structure member 1 and is not easily generated debris, which is beneficial to further reducing the PIM.

[0071] In this solution, the conductive lubricating layer 3 only needs to cover the first surface of the first metal structure member 1, without the need for connection processes such as welding, and the thickness requirement for the first metal structure member 1 is also relatively low. Therefore, the thickness of the first metal structure member 1 can be reduced, which is beneficial to realizing the thinning of the mobile terminal.

[0072] When the conductive lubricating layer 3 is provided on the first surface of the first metal structure member 1, the above-mentioned conductive lubricating layer 3 can be provided only in a partial area of the first surface of the first metal structure member 1, and the shrapnel 2 abuts against the above-mentioned partial area.

[0073] In a specific embodiment, the conductive particles in the conductive lubricating layer 3 include at least one of silver powder, silver flakes, and silver-coated aluminum. Silver metal has good electrical conductivity and relatively low cost.

[0074] The lubricant in the embodiment of the present application refers to a substance that can reduce the friction between the elastic piece 2 and the first metal structural member 1, and there is no limitation on the selection of specific categories. For example, the lubricant may include at least one of resin, silicone oil, or paraffin.

[0075] In a specific embodiment, if the lubricant is a thermosetting resin, the conductive lubricating layer 3 is conductive silver paste. In addition, the lubricant in the embodiment of the present application may specifically also be non-thermosetting to improve the lubricating effect of the conductive lubricating layer 3.

[0076] The first metal structural member 1 may include an aluminum alloy structural member or a magnesium alloy structural member. The structural members of these two materials are relatively soft, are more likely to generate oxides, and are easily scratched. In the embodiment provided by the present application, by providing the conductive lubricating layer 3 on the first surface of the first metal structural member 1, the interfacial friction between the elastic piece 2 and the first metal structural member 1 can be reduced, and the protection effect on the first metal structural member 1 can be improved.

[0077] The volume resistivity of the conductive lubricating layer 3 is less than or equal to 0.2 ohm·cm. Thus, the impedance of the electrical connection between the elastic piece 2 and the first metal structural member 1 is small, PIM is reduced, and the effect of the electrical connection is improved.

[0078] When specifically setting the conductive lubricating layer 3, the thickness of the conductive lubricating layer 3 is greater than or equal to 10 μm. For example, the thickness of the conductive lubricating layer 3 may be 15 μm - 20 μm, 21 μm - 25 μm, 26 μm - 30 μm, 31 μm - 37 μm, 38 μm - 40 μm, 41 μm - 42 μm, 43 μm - 45 μm, 46 μm - 50 μm, 51 μm - 60 μm, or 61 μm - 70 μm, etc. If the thickness of the conductive lubricating layer 3 is less than 10 μm, it is difficult to ensure the lubricating effect, and the effect of reducing PIM and maintaining the stability of PIM is poor. The thicker the thickness of the conductive lubricating layer 3, the better the lubricating effect, but the cost will also increase accordingly.

[0079] Please continue to refer to Figure 4, In one embodiment, the above-mentioned mobile terminal further includes a second metal structure 4, and the second end of the elastic sheet 2 is connected to the second metal structure 4. That is, the elastic sheet 2 is connected between the second metal structure 4 and the first metal structure 1, and the second metal structure 4 is electrically connected to the first metal structure 1 through the elastic sheet 2. In the embodiment of the present application, the implementation manner of connecting the second end of the elastic sheet 2 to the second metal structure 4 may include direct fixed connection (such as welding, screw connection or bonding, etc.), or abutting, or realizing electrical connection through a third party, etc. The second metal structure 4 and the first metal structure 1 press the above-mentioned elastic sheet 2, so that there is a certain pressure between the first end of the elastic sheet 2 and the first metal structure 1, so as to realize the abutment between the first end of the elastic sheet 2 and the first surface of the first metal structure 1. Since a conductive lubricating layer 3 is also provided on the first surface of the first metal structure 1, the PIM between the elastic sheet 2 and the first metal structure 1 is small and stable, the pressure between the elastic sheet 2 and the first metal structure 1 is also small and stable, the electrical connection effect is good and reliable, and thus the stable electrical connection between the first metal structure 1 and the second metal structure 4 is realized, and the effect and stability of the electrical signal transmission between the two are improved.

[0080] Among them, the pressure of the first metal structure 1 and the second metal structure 4 pressing the elastic sheet 2 is less than or equal to 0.5 N. For example, when the current transmitted between the elastic sheet 2 and the first metal structure 1 is 500 mA, the pressure of the first metal structure 1 and the second metal structure 4 pressing the elastic sheet 2 is 0.3 N. In the embodiment of the present application, the pressure between the elastic sheet 2 and the first metal structure 1 is small and stable, and the strength requirement for the first metal structure 1 is low, which can make the first metal structure 1 designed thinner. In addition, more elastic sheets 2 can be provided to realize the electrical connection between the first metal structure 1 and the second metal structure 4, so as to improve the connection effect between the first metal structure 1 and the second metal structure 4.

[0081] It should be noted that the "connection" in the embodiment of the present application may refer to direct physical connection or indirect connection without special description. For example, when the two are connected through a third party, it is an indirect connection, or as long as the two realize conductive (signal transmission) electrical connection.

[0082] The specific structure of the above-mentioned second metal structure 4 has various possibilities. Specifically, the second metal structure 4 is at least a part of the circuit board. For example, the second metal structure 4 may be a metal pin or a metal layer on the circuit board and other structural components. In addition, the above-mentioned second metal structure 4 may also be a feeding structure or a grounding structure, etc. In short, it may be any structural component with electrical transmission requirements.

[0083] In a specific embodiment, the second metal structure 4 may be a metal pin or a metal layer on a circuit board, that is, the mobile terminal further includes a circuit board, and the second end of the elastic sheet 2 is connected to a conductive structure on the circuit board. For example, the conductive structure may be in any form such as a metal pin or a metal layer. At least a part of the circuit board is electrically connected to the first metal structure 1 through the elastic sheet 2. In actual application, other electronic devices or electronic assemblies may also be connected to the circuit board, so that the above-mentioned electronic devices or electronic assemblies can be electrically connected to the first metal structure 1 through the elastic sheet 2, and the electrical connection effect is relatively reliable and stable, and the signal transmission effect between the electronic devices or electronic assemblies and the first metal structure is better.

[0084] In an embodiment, the first metal structure 1 of the mobile terminal is used as an antenna radiator, and the second end of the elastic sheet 2 is connected to a radio frequency device or a grounding structure member, that is, the second metal structure 4 may be a grounding structure member or a feeding structure member. In addition, the connection between the second end of the elastic sheet 2 and the radio frequency device can be realized through a circuit board. Specifically, the elastic sheet 2 is directly connected to the circuit board, and the circuit board is connected to the radio frequency device, so as to realize the connection between the elastic sheet 2 and the radio frequency device. In this embodiment, by using the reliable connection between the elastic sheet 2 and the first metal structure 1, the electrical connection between the antenna radiator and other structures can be realized, and the signal transmission can be realized by using the reliable connection between the elastic sheet 2 and the first metal structure 1. For example, the transmitted signals may include communication signals or ground signals. In the electrical connection structure including the antenna radiator, the PIM is relatively low, the signal transmission effect is good, and it is beneficial to thin the mobile terminal.

[0085] In a specific embodiment, the elastic sheet 2 is used as a feeding elastic sheet to realize the feeding of the antenna radiator. When specifically implemented, the second end of the elastic sheet 2 is connected to a radio frequency device. The radio frequency device may specifically refer to a signal source, which may be a structure such as a communication chip in the mobile terminal. The antenna radiator, the feeding elastic sheet, and the radio frequency device are connected in sequence to realize the feeding of the antenna radiator, and the feeding signal transmission quality is good.

[0086] In another specific embodiment, the elastic sheet 2 is used as a grounding elastic sheet to realize the grounding of the antenna radiator. The second end of the elastic sheet 2 is connected to a grounding structure member, and the antenna radiator, the grounding elastic sheet, and the grounding structure member are connected in sequence to realize the grounding of the antenna radiator. The specific structure and form of the grounding structure member are not limited, and it may be a frame, a fixing member, a bracket, or a circuit board existing in the mobile terminal, or a grounding metal plate provided in the mobile terminal, which can be designed according to actual requirements.

[0087] In a specific embodiment, the first metal structure 1 can be the middle frame of a mobile terminal. To reduce the weight of the mobile terminal, the middle frame is usually an aluminum alloy middle frame, and it is relatively convenient to use the middle frame as an antenna radiator. Adopting this solution is beneficial to reducing the PIM between the elastic sheet 2 and the first metal structure 1, reducing the pressure between the elastic sheet 2 and the first metal structure 1, and thinning the thickness of the middle frame; in addition, setting the conductive lubricating layer 3 has no requirement for the thickness of the first metal structure 1, which is also beneficial to thinning the thickness of the middle frame to improve the thinning degree of the mobile terminal.

[0088] In a specific embodiment, when the first metal structure 1 is not an antenna radiator, the above-mentioned elastic sheet 2 can also be used as a grounding elastic sheet to realize the grounding of the first metal structure 1.

[0089] Figure 5 This is a schematic structural diagram of a mobile terminal in an embodiment of the present application. As Figure 5 shown, in another specific embodiment, the first metal structure 1 can also be the camera shell 5 (camera deco) of the mobile terminal. The camera shell 5 specifically may include a glass cover plate and a metal ring located on the periphery of the glass cover plate, and the metal ring needs to be grounded. In the embodiment of the present application, since the pressure between the elastic sheet 2 and the first metal structure 1 is reduced, the strength requirement for the first metal structure 1 is relatively low. The metal ring of the camera shell 5 is usually thin and has low strength, but it is also suitable for being used as the first metal structure 1 in the embodiment of the present application for connection with the elastic sheet 2. Therefore, the application scenarios of the embodiment of the present application are enriched. In addition, since the pressure between the elastic sheet 2 and the first metal structure 1 is small, multiple elastic sheets 2 can be provided to abut against the metal ring to improve the grounding reliability of the metal ring.

[0090] Based on the same inventive concept, the present application also provides an electrical connection method. The electrical connection method is applied to the mobile terminal in the above embodiment, and the mobile terminal includes a first metal structure and an elastic sheet. Figure 6 This is a schematic flow diagram of the electrical connection method in an embodiment of the present application. As Figure 6 shown, the electrical connection method specifically includes:

[0091] S101. Set a conductive lubricating layer on the first surface of the first metal structure. The conductive lubricating layer includes conductive particles and a lubricant;

[0092] S102. Set the first end of the elastic sheet to abut against the first surface of the first metal structure.

[0093] The above-mentioned elastic piece is electrically connected to the first metal structural member. When the elastic piece and the first metal structural member are connected by this method, the PIM therebetween is relatively low. The abutting force between the elastic piece and the first metal structural member can be designed to be relatively small, so the pressure on the first metal structural member is relatively small, resulting in a relatively low strength requirement for the first metal structural member of the mobile terminal and being more flexible in the selection of the first metal structural member. In addition, since the abutting force between a single elastic piece and the first metal structural member is relatively small, the number of elastic pieces can be increased according to requirements to achieve multi-point electrical connection and improve the electrical connection stability between the two structural members. Moreover, since the abutting force between the elastic piece and the first metal structural member is relatively small, the elastic piece is not likely to scratch the first metal structural member and is not likely to generate debris, which is beneficial to further reducing the PIM. When a conductive lubricating layer is provided on the surface of the first metal structural member, there is no requirement for the thickness of the first metal structural member, so the thickness of the first metal structural member can be reduced to facilitate the thinning of the mobile terminal.

[0094] In this solution, the conductive lubricating layer 3 only needs to cover the first surface of the first metal structural member, without the need for connection processes such as welding, and the thickness requirement for the first metal structural member is also relatively low. Therefore, the thickness of the first metal structural member can be reduced, which is beneficial to the thinning of the mobile terminal.

[0095] When specifically setting the above-mentioned conductive lubricating layer, the volume resistivity of the conductive lubricating layer is less than or equal to 0.2 ohm·cm. Thereby, the impedance of the electrical connection between the elastic piece and the first metal structural member is relatively small, reducing the PIM and improving the effect of the electrical connection.

[0096] In one embodiment, the above electrical connection method further includes: setting the thickness of the conductive lubricating layer to be greater than or equal to 10 μm. For example, the thickness of the above-mentioned conductive lubricating layer 3 can be 15 μm - 20 μm, 21 μm - 25 μm, 26 μm - 30 μm, 31 μm - 37 μm, 38 μm - 40 μm, 41 μm - 42 μm, 43 μm - 45 μm, 46 μm - 50 μm, 51 μm - 60 μm or 61 μm - 70 μm, etc. If the thickness of the conductive lubricating layer is less than 10 μm, it is difficult to ensure the lubricating effect, and the effect of reducing and maintaining the PIM stably is relatively poor. The thicker the thickness of the above-mentioned conductive lubricating layer, the better the lubricating effect, but the cost will also increase accordingly.

[0097] The mobile terminal may further include a second metal structure, the second end of the spring is connected to the second metal structure, and the second metal structure is electrically connected to the first metal structure through the spring. The electrical connection method also includes: squeezing the spring through the first metal structure and the second metal structure; the second metal structure is electrically connected to the first metal structure through the spring. The second metal structure and the first metal structure squeeze the spring so that there is a certain pressure between the first end of the spring and the first metal structure, so as to achieve abutment between the first end of the spring and the first surface of the first metal structure. Since a conductive lubricating layer is also provided on the first surface of the first metal structure, the PIM between the spring and the first metal structure is small and stable, the pressure between the spring and the first metal structure is also small and stable, and the electrical connection effect is good and reliable, thereby achieving a stable electrical connection between the first metal structure and the second metal structure, and improving the effect and stability of electrical signal transmission between the two.

[0098] In a further embodiment, the electrical connection method further includes: squeezing the spring sheet through the first metal structure and the second metal structure, wherein the pressure of squeezing the spring sheet by the first metal structure and the second metal structure is less than or equal to 0.5 N. The pressure between the spring sheet and the first metal structure in the embodiment of the present application is small and stable, and the strength requirement for the first metal structure is low, so that the first metal structure can be designed to be thinner. In addition, more spring sheets can be provided to achieve the electrical connection between the first metal structure and the second metal structure, so as to improve the connection effect of the first metal structure and the second metal structure.

[0099] In one embodiment, the mobile terminal further includes a circuit board, and the second metal structure is at least a part of the circuit board. The second end of the spring is connected to the circuit board, and at least a part of the circuit board is electrically connected to the first metal structure through the spring, and the second end is an end of the spring away from the first end. Specifically, the second end of the spring is connected to the conductive structure on the circuit board, for example, the conductive structure can be in any form such as a metal pin or a metal layer. At least a part of the circuit board is electrically connected to the first metal structure through the spring. In actual application, the circuit board can also be connected to other electronic devices or electronic devices, so that the electronic devices or electronic devices can be electrically connected to the first metal structure through the spring, and the electrical connection effect is relatively reliable and stable, and the signal transmission effect between the electronic device or electronic device and the first metal structure is better.

[0100] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A mobile terminal, characterized in that, It includes a shrapnel, a conductive lubricating layer, and a first metal structural member; wherein, the conductive lubricating layer is located on the first surface of the first metal structural member, the shrapnel includes a first end and a second end facing away from each other, the first end of the shrapnel abuts against the first surface of the first metal structural member, and the shrapnel is electrically connected to the first metal structural member; The conductive lubricating layer includes conductive particles and a lubricant.

2. The mobile terminal according to claim 1, characterized in that, The conductive particles include at least one of silver powder, silver flakes, and silver-coated aluminum.

3. The mobile terminal according to claim 1 or 2, characterized in that, The lubricant includes at least one of resin, silicone oil, and paraffin wax.

4. The mobile terminal according to any one of claims 1 to 3, characterized in that, The first metal structural member includes an aluminum alloy structural member or a magnesium alloy structural member.

5. The mobile terminal according to any one of claims 1 to 4, characterized in that The mobile terminal further includes a second metal structural member, the second end of the shrapnel is connected to the second metal structural member, and the second metal structural member is electrically connected to the first metal structural member through the shrapnel.

6. The mobile terminal according to claim 5, wherein Wherein, The shrapnel is used to bear the pressure of extrusion between the first metal structural member and the second metal structural member, and the pressure borne by the shrapnel is less than or equal to 0.5 N.

7. The mobile terminal according to claim 5 or 6, characterized in that, The mobile terminal further includes a circuit board, and the second metal structural member is at least a part of the circuit board.

8. The mobile terminal according to any one of claims 1 to 7, characterized in that, The volume resistivity of the conductive lubricating layer is less than or equal to 0.2 ohm.cm.

9. The mobile terminal according to any one of claims 1 to 8, characterized in that, The thickness of the conductive lubricating layer is greater than or equal to 10 μm.

10. The mobile terminal according to any one of claims 1 to 9, characterized in that, The first metal structural member is used as an antenna radiator.

11. The mobile terminal according to claim 10, wherein The shrapnel is used for feeding, and the second end of the shrapnel is connected to a feeding structural member.

12. The mobile terminal according to claim 10, wherein, The shrapnel is used for grounding, and the second end of the shrapnel is connected to a grounding structural member.

13. The mobile terminal according to claim 12, characterized in that, The first metal structural member includes the middle frame of the mobile terminal or a camera decorative member.

14. An electrical connection method, applied to a mobile terminal, the mobile terminal comprising a first metal structural member and a shrapnel, characterized in that, The method includes: Providing a conductive lubricating layer on the first surface of the first metal structural member, the conductive lubricating layer including conductive particles and a lubricant; Providing the first end of the shrapnel to abut against the first surface of the first metal structural member, wherein the shrapnel is electrically connected to the first metal structural member.

15. The electrical connection method according to claim 14, wherein, The volume resistivity of the conductive lubricating layer is less than or equal to 0.2 ohm.cm.

16. The electrical connection method according to claim 14 or 15, characterized in that It further includes: Providing the thickness of the conductive lubricating layer to be greater than or equal to 10 μm.

17. The electrical connection method according to any one of claims 14 to 16, characterized in that The mobile terminal further includes a second metal structural member, and the method further includes: Providing the second end of the shrapnel to be connected to the second metal structural member, wherein the second metal structural member is electrically connected to the first metal structural member through the shrapnel.

18. The electrical connection method according to claim 17, wherein, The method further includes: Extruding the shrapnel through the first metal structural member and the second metal structural member, wherein the pressure of extrusion of the shrapnel by the first metal structural member and the second metal structural member is less than or equal to 0.5 N.

19. The electrical connection method according to claim 17 or 18, characterized in that, The mobile terminal further includes a circuit board, and the second metal structural member is at least a part of the circuit board.

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