Button assembly structure, button assembly method and electronic devices

Abstract

This application discloses a button assembly structure, a button assembly method, and an electronic device. The button assembly structure includes a housing, a support member, and a button module. The housing includes a base plate and a frame, with mounting holes formed in the frame. The support member is disposed inside the housing, and a mounting groove is formed on the support member at a position opposite to the mounting holes. The button module includes a keycap, a button circuit board, and a button spring. The button spring is disposed on the button circuit board, which is disposed in the mounting groove. The keycap slides within the mounting hole and can abut against the button spring. In the button assembly structure of this application, a mounting groove is directly formed on the support member at a position directly opposite the mounting holes of the housing. The button circuit board lies flat in the mounting groove. The black border area only needs to cover and shield the original glue, steps, safety gaps, and light leakage prevention redundancy, without needing to make way for the vertical slot and its groove walls. Therefore, the width of the black border shrinks proportionally with the elimination of the vertical slot.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and more specifically, to a button assembly structure, a button assembly method, and an electronic device. Background Technology

[0002] A high screen-to-body ratio is a major selling point for electronic devices such as tablets, and manufacturers are currently vying to release products with narrow bezel solutions to achieve this. Tablets typically have buttons on the side of their casing for functions such as power on / off, volume control, taking photos / videos, and muting. Due to limitations in the current button assembly structure, tablet displays cannot achieve extremely narrow bezels, thus hindering further increases in screen-to-body ratio. Summary of the Invention

[0003] This application provides a button assembly structure, a button assembly method, and an electronic device. On the support, a mounting groove is directly formed at the position opposite to the mounting hole of the outer shell. The button circuit board is placed flat in the mounting groove. The black border area only needs to cover and shield the original glue, steps, safety gaps, and light leakage prevention redundancy. There is no need to make way for the vertical slot and its groove wall. Therefore, the width of the black border shrinks proportionally with the elimination of the vertical slot, which increases the screen ratio of the electronic device.

[0004] In a first aspect, this application provides a button assembly structure, including a housing, a support member, and a button module.

[0005] The housing includes a base plate and a frame disposed on the edge of the base plate, and the frame has mounting holes.

[0006] The support is located on the inside of the housing, and a mounting groove is provided on the support at the part opposite to the mounting hole.

[0007] The key module includes keycaps, a key circuit board, and key springs. The key springs are mounted on the key circuit board, which is located in a mounting slot. The keycaps slide within the mounting holes and abut against the key springs.

[0008] The button assembly structure provided in this application eliminates the vertical slots on the support component, instead creating mounting slots directly opposite the mounting holes on the outer casing. The button circuit board lies flat in this mounting slot from the side, and the keycaps are inserted into the mounting holes from the side to abut against the button springs. This completely removes the circuit board insertion space on the support component from the visible area of ​​the cover plate, allowing the display module to move horizontally towards the bezel. The black border area only needs to cover and conceal the original adhesive, steps, safety gaps, and light leakage prevention redundancy, without needing to make way for the vertical slots and their walls. This spatial shift directly improves visual appeal; the black border no longer obscures the vertical slots, so its width shrinks proportionally with the elimination of the vertical slots. This increases the screen-to-body ratio of the electronic device, providing users with a wider field of view and enhancing the overall user experience.

[0009] Furthermore, the keycap extends directly into the mounting slot through the mounting hole and abuts against the key spring, eliminating the transition section within the through hole found in related technologies, thus reducing the keycap's thickness ( Figure 9 The dimensions in the X direction are significantly reduced, and the thickness of the keycaps is reduced, which shortens the distance between the point of force application of the finger and the point of force bearing of the key spring, that is, the torque is reduced, the keycaps are less likely to tilt, the keycaps move stably when pressed, and the rebound is faster, which can improve the user's pressing feel.

[0010] In one possible design, the support member is provided with an adhesive application area for bonding with the display screen;

[0011] The projections of the button circuit board and the dispensing area onto the first reference surface at least partially overlap, and the first reference surface is perpendicular to the thickness direction of the base plate.

[0012] The aforementioned limitation essentially involves stacking the originally misaligned button circuit boards and dispensing areas along the Z-direction, further reducing the ineffective space occupied by the support components at the edge of the cover plate, thus making it easier to narrow the black border on the cover plate.

[0013] In one possible design, the dispensing area includes a first area and a second area. The first area corresponds to the position of the mounting groove, and the second area is located at both ends of the first area. The widths of the first area and the second area are equal.

[0014] The first and second areas have the same width, and the entire dispensing area is a straight line of equal width. The dispensing equipment does not need to change speed or avoid obstacles. The dispensing speed and pressure remain constant, and the glue width and height are uniform without any gaps. This not only eliminates defects such as glue overflow and glue shortage caused by irregular paths, but also eliminates the need for real-time correction by the vision system. The programmed path is shortened, and the dispensing efficiency is improved.

[0015] In addition, the uniform adhesive lines ensure consistent bonding stress throughout the cover plate, resulting in balanced bonding strength. This effectively prevents stress concentration when electronic devices are subjected to external impacts, reducing the risk of the cover plate peeling off from the support components.

[0016] In one possible design, the button circuit board is equipped with data transmission components;

[0017] The support component is provided with a wiring groove to accommodate the data transmission component. One end of the wiring groove is connected to the mounting groove, and the width of the wiring groove is smaller than the width of the button circuit board.

[0018] The support structure features a cable routing channel. During assembly, the data transmission components can be easily embedded within the channel, and the channel walls provide continuous protection for the components, preventing breakage due to pulling or bending in the event of a drop. The width of the cable routing channel is smaller than the width of the button circuit board, allowing the board to be supported by the shoulders at both ends of the channel, preventing it from detaching from the channel.

[0019] In one possible design, the cable tray is located on the side of the support facing the base plate.

[0020] The wiring channel is located on the side of the support component facing the base plate. The data transmission component is sandwiched between the support component and the base plate. The channel wall and the base plate together form a closed channel. When the device is dropped, the data transmission component is not directly impacted by other protruding parts, which ensures the reliability of the data transmission component and thus ensures the electrical connection stability between the button circuit board and the motherboard.

[0021] In one possible design, an adapter board is provided at the end of the data transmission component that is away from the button circuit board;

[0022] The support component has a clearance hole, which is connected to the wiring groove. The adapter plate is located in the clearance hole and is fixedly connected to the base plate.

[0023] The button assembly structure also includes a bracket and a motherboard. The bracket is fixedly connected to the support and holds the motherboard between the bracket and the support. The motherboard is provided with an electrical connector, which is located in a clearance hole and elastically abuts against the adapter plate.

[0024] By using a fixed connection between the bracket and the support component, the bracket, main board, support component, and base plate form a clamp structure. Electrical connectors, such as conductive springs or conductive foam, as well as the adapter plate, are concealed within clearance holes in the support component. This compresses the electrical connectors between the adapter plate and the main board, creating vertical conductivity between them. This design eliminates the need to plug and unplug connectors such as BTB connectors, simplifying the assembly process.

[0025] In addition, the bracket and support can be locked with screws, the compression path is in the Z direction, and a constant pressure is automatically achieved as the screws are tightened. The contact resistance of the conductive spring or conductive foam is stable, and the shock absorption effect of the conductive spring or conductive foam is good when it is dropped or rolled, which can further ensure the stability of the electrical connection between the button circuit board and the motherboard.

[0026] In one possible design, the button circuit board, data transmission components, and adapter board are integrated into a single flexible circuit board.

[0027] The button circuit board, data transmission components and adapter board are integrally formed using the same flexible circuit board, eliminating the need for welding, conductive adhesive bonding and connector insertion. The entire board has no broken joints, eliminating the risk of solder joint cracking when dropped, thus improving reliability. Furthermore, the integrated structure enables a thin and easy-to-assemble design.

[0028] In one possible design, a reinforcing plate is provided on the side of the key circuit board facing away from the keycap, and the key circuit board is fixedly connected to the bottom of the mounting slot through the reinforcing plate.

[0029] After the reinforcing sheet is attached to the back of the button circuit board, a localized rigid area is formed. When placed into the mounting slot, it is flattened by the reinforcing sheet, allowing for surface-to-surface bonding or thermoforming fixation to the bottom of the slot without the need for additional screws. The reinforcing sheet increases the rigidity of the button area, preventing the button circuit board from warping or deforming when pressed, ensuring stable keycap travel and guaranteeing a good tactile experience for the user.

[0030] In one possible design, the button circuit board and the reinforcing plate are provided with positioning holes, and the bottom of the mounting groove is provided with positioning protrusions that engage with the positioning holes.

[0031] The positioning bumps engage with the positioning holes of the key circuit board and reinforcing plate, automatically aligning upon insertion without the need for additional clamps. The positioning bumps and holes ensure a smooth, flush fit between the reinforcing plate and the bottom of the groove, preventing the key circuit board from slipping during pressing and ensuring stable keycap travel, further guaranteeing a superior tactile experience for the user.

[0032] In one possible design, the bottom of the mounting slot has a through hole, and the keycap has a hook that passes through the through hole;

[0033] The key assembly structure also includes a limiting member, which is located on the side of the support member opposite to the mounting groove and cooperates with a hook passing through the through hole to prevent the keycap from coming out.

[0034] The hook passes through the through hole at the bottom of the slot and engages with the limiting piece on the back, eliminating the need for elastic ear loops around the keycap. Compared to ear loops made of elastic materials such as rubber or elastomers, the rigid fastening eliminates the risks of aging and rebound failure of such materials, ensuring the reliability of keycap positioning even after long-term use.

[0035] In one possible design, the housing is provided with a display screen, which includes a cover plate and a display module stacked together.

[0036] The projections of the display module and the hook on the second reference plane do not overlap;

[0037] And / or, the projections of the display module and the limiting member on the second reference surface do not overlap, and the second reference surface is parallel to the thickness direction of the base plate.

[0038] By limiting the position as described above, interference from hooks or limiting components with the display module can be avoided, ensuring that the display module can move closer to the bezel, thereby ensuring a narrow black border effect on the display screen.

[0039] In one possible design, the limiting member is a sheet-like body, including a first sheet and a base connected together. The first sheet is pressed into the through hole of the support by a hook, and the base is curved and elastically abuts against a snap-fit ​​groove provided on the support.

[0040] In one possible design, the limiting member also includes a second piece connected to the first piece;

[0041] The button assembly structure also includes a bracket and a motherboard. The bracket is fixedly connected to the support member, and the second piece and the motherboard are clamped between the bracket and the support member.

[0042] The base of the limiting component is secured by a snap-fit ​​groove, and the bracket and support are fixedly connected to form a clamp structure, which clamps and fixes the second piece between the bracket and the motherboard. This double fixation ensures the reliability of the limiting component's installation on the back of the support and provides stable positioning for the keycaps.

[0043] In one possible design, the support has a groove for accommodating the second piece.

[0044] The bracket has a recess to accommodate the second piece, so that the second piece can sink into the surface of the bracket and avoid the second piece protruding from the surface of the bracket and causing damage to the motherboard.

[0045] In one possible design, the keycap includes a first part and a second part. The first part is for the user to press and has a receiving groove on the side facing the key circuit board. The second part is located in the receiving groove and is used to abut against the key spring.

[0046] The keycap is divided into a first part and a second part, whose functions are decoupled through material selection. The first part bears the pressing load, remains undeformed and does not develop oil, giving the keycap a high-end feel and an impact-resistant framework. The second part is hidden in the receiving groove, is soft in texture, and flexibly conforms to the key spring, reducing rebound noise and preventing the corners of hard materials from scratching the key spring surface. The first part can be made of anodized aluminum, stainless steel, titanium alloy, ceramic, hard engineering plastics, etc., taking into account heat dissipation, electromagnetic shielding, or decorative needs. The second part can be made of silicone, rubber, thermoplastic elastomers, polyurethane, etc., utilizing their compressibility to absorb overpressure and extend the fatigue life of the key spring.

[0047] In one possible design, the second part is provided with a protrusion for abutting against the button spring, and the second part is also provided with a limiting boss with a height greater than the protrusion.

[0048] By designing a limiting boss that is higher than the convex bulge on the second part, the limiting boss can abut against the key circuit board in advance at the end of the keycap travel, preventing the keycap from being pressed down too much. This not only prevents the convex bulge from excessively squeezing the key spring and causing damage, but also provides rigid stop feedback for the fingers, improving the user's pressing feel.

[0049] In one possible design, the first part is provided with a step, and an elastic element is provided between the step and the button circuit board for compression.

[0050] The elastic element is compressed between the step and the key circuit board. In the unpressed state, the elastic element pushes the entire keycap outward through the step. The elastic element continuously pushes the keycap outward with the help of the step, ensuring the keycap is in a stable, hovering position before the finger touches it, without any looseness. When pressed, the elastic element is further compressed, and the stored rebound force, together with the key spring, provides a double reset for the keycap, making the keycap's rebound more responsive. Overall, this improves the product quality of electronic devices and the user's typing experience.

[0051] In one possible design, the button circuit board is a flexible circuit board, and the side of the button circuit board facing away from the keycap is directly glued to the bottom of the mounting slot.

[0052] Unlike related technologies where the button circuit board is inserted into a vertical slot from top to bottom, in this application, because the mounting slot is opened laterally, the button circuit board can be installed horizontally and directly bonded to the bottom of the slot without the need for reinforcing plates, and the bottom of the slot provides support for the button circuit board. This saves material, eliminates the tolerance of reinforcing plates, allows the button circuit board to fit closer to the bottom of the slot, provides a stable pressing feel, and reduces the overall thickness of the button circuit board, thus reducing the machining depth of the mounting slot, ensuring the structural strength of the support component, and improving the overall shock resistance of the electronic device.

[0053] Secondly, this application also provides a button assembly method, including the following steps:

[0054] The button circuit board is placed into the mounting groove opened on the support from the side and fixed in the mounting groove.

[0055] Secure the support to the inside of the housing;

[0056] Install the keycaps into the mounting holes on the casing.

[0057] The button assembly method provided in this application eliminates the vertical slots on the support component. Instead, a mounting groove is directly created at the location opposite the mounting holes on the outer casing. The button circuit board is placed horizontally in this mounting groove, and the keycap is inserted into the mounting hole from the side to abut against the button spring. This completely removes the circuit board insertion space on the support component from the visible area of ​​the cover plate, allowing the display module to move horizontally towards the bezel. The black border area only needs to cover and conceal the original adhesive, steps, safety gaps, and light leakage prevention redundancy, without needing to make way for the vertical slots and their walls. This spatial shift directly brings visual benefits. The black border no longer serves to obscure the vertical slots, so its width shrinks proportionally with the elimination of the vertical slots. This increases the screen-to-body ratio of the electronic device, providing users with a wider field of view and improving the overall user experience.

[0058] In one possible design, the step of securing the support to the inside of the housing includes:

[0059] The data transmission components led out from the button circuit board are placed in the wiring grooves opened on the support.

[0060] The support structure features a cable routing channel. During assembly, the data transmission components can be easily embedded within the channel, and the channel walls provide continuous protection for the components, preventing breakage due to pulling or bending in the event of a drop. The width of the cable routing channel is smaller than the width of the button circuit board, allowing the board to be supported by the shoulders at both ends of the channel, preventing it from detaching from the channel.

[0061] In one possible design, the step of installing the keycaps into the mounting holes of the housing includes:

[0062] The keycap hook passes through a through hole in the bottom of the mounting slot;

[0063] On the side of the support member facing away from the mounting groove, insert the limiting member between the hook and the support member.

[0064] The hook passes through the through hole at the bottom of the slot and engages with the limiting piece on the back, eliminating the need for elastic ear loops around the keycap. Compared to ear loops made of elastic materials such as rubber or elastomers, the rigid fastening eliminates the risks of aging and rebound failure of such materials, ensuring the reliability of keycap positioning even after long-term use.

[0065] In one possible design, after inserting the limiting member between the hook and the support member, the following steps are also included:

[0066] Place the motherboard on the support, and place the second piece of the limiting component on the motherboard;

[0067] Fix the bracket to the support so that the bracket, the second piece, the main board and the support are pressed together in sequence.

[0068] By using the fixed connection between the bracket and the support component, the bracket, motherboard, and support component form a clamping structure, clamping and fixing the second piece between the bracket and the motherboard. This ensures the reliable installation of the limiting component on the back of the support component and provides stable limiting for the keycaps.

[0069] In one possible design, the step of fixing the bracket to the support member to sequentially press the bracket, the second piece, the main board, and the support member together includes:

[0070] Place the adapter plate extending from the button circuit board into the clearance hole opened on the support, and fix the adapter plate to the bottom plate of the housing;

[0071] Align the electrical connectors on the motherboard with the adapter board.

[0072] This design not only clamps and fixes the second piece of the limiting component between the motherboard and the bracket, but also enables electrical connection between the motherboard and the adapter board via electrical connectors. A single step simultaneously completes the keycap positioning and the electrical connection between the key circuit board and the motherboard, offering advantages such as fewer steps and higher assembly efficiency.

[0073] In one possible design, the step of installing the keycaps into the mounting holes in the housing further includes:

[0074] Place the adapter plate extending from the button circuit board into the clearance hole opened on the support, and fix the adapter plate to the bottom plate of the housing;

[0075] Align the electrical connectors on the motherboard with the adapter board;

[0076] Fix the bracket to the support so that the bracket, motherboard and support are pressed together in sequence.

[0077] By using a fixed connection between the bracket and the support component, the bracket, main board, support component, and base plate form a clamp structure. Electrical connectors, such as conductive springs or conductive foam, as well as the adapter plate, are concealed within clearance holes in the support component. This compresses the electrical connectors between the adapter plate and the main board, creating vertical conductivity between them. This design eliminates the need to plug and unplug connectors such as BTB connectors, simplifying the assembly process.

[0078] Thirdly, this application also provides an electronic device, including the button assembly structure described in the first aspect.

[0079] The electronic device provided in this application, including the button assembly structure in the first aspect, eliminates the vertical slot on the support component. Instead, a mounting groove is directly formed at the location opposite the mounting holes on the outer casing. The button circuit board lies flat in the mounting groove from the side, and the keycaps are inserted into the mounting holes from the side to abut against the button springs. As a result, the circuit board insertion space on the support component is completely removed from the visible area of ​​the cover plate, allowing the display module to move horizontally towards the bezel. The black border area only needs to cover and conceal the original adhesive, steps, safety gaps, and light leakage prevention redundancy, without needing to make way for the vertical slot and its walls. This spatial shift directly brings visual benefits. The black border no longer serves to obscure the vertical slot, so its width shrinks proportionally with the elimination of the vertical slot. This increases the screen-to-body ratio of the electronic device, providing users with a wider field of view and improving the overall user experience.

[0080] In one possible design, the electronic device also includes a display screen, which comprises a cover plate and a display module stacked together. The cover plate covers the bezel, and the cover plate and the housing enclose a receiving space for accommodating the functional elements of the electronic device.

[0081] It specifically defines the outer contour structure of the electronic device. Attached Figure Description

[0082] Figure 1 This is a partial schematic diagram of a tablet computer in related technologies;

[0083] Figure 2 yes Figure 1 An exploded view of a tablet computer in the image;

[0084] Figure 3 yes Figure 1 A cross-sectional view of the tablet computer in the image;

[0085] Figure 4 This is a schematic diagram of a tablet computer provided in an embodiment of this application;

[0086] Figure 5 yes Figure 4 A partial schematic diagram of the tablet computer in the image;

[0087] Figure 6 yes Figure 5 An exploded view of a tablet computer in the image;

[0088] Figure 7 yes Figure 5 An exploded view of the tablet computer from another perspective;

[0089] Figure 8 This is a partial cross-sectional view of an example of a tablet computer provided in an embodiment of this application;

[0090] Figure 9 yes Figure 8 A front view of the section plane in the image;

[0091] Figure 10 This is an exploded view of the display screen and support provided in an embodiment of this application;

[0092] Figure 11 yes Figure 9 A magnified view of a portion of the image;

[0093] Figure 12 This is an exploded view of the shell, button module, and support component provided in the embodiments of this application;

[0094] Figure 13 This is a partial cross-sectional view of another example of a tablet computer provided in the embodiments of this application;

[0095] Figure 14 This is a schematic diagram of an example of a keycap provided in an embodiment of this application;

[0096] Figure 15 yes Figure 5 An exploded view of another example of a tablet computer;

[0097] Figure 16 This is a schematic diagram of the limiting member provided in an embodiment of this application;

[0098] Figure 17 This is a partial cross-sectional view of another example of a tablet computer provided in the embodiments of this application;

[0099] Figure 18 yes Figure 17 A front view of the section plane in the image;

[0100] Figure 19 This is an exploded view of the bracket, limiting member, and support member provided in the embodiments of this application;

[0101] Figure 20 yes Figure 19 An assembly diagram of the bracket, limiting components, and supporting components;

[0102] Figure 21 yes Figure 20 A schematic diagram of the bracket, limiting component, and support component from another perspective;

[0103] Figure 22 This is a schematic diagram of another example of a keycap provided in an embodiment of this application;

[0104] Figure 23 yes Figure 22 An exploded view of the keycaps in the image;

[0105] Figure 24 This is a partial cross-sectional view of another example of a tablet computer provided in the embodiments of this application;

[0106] Figure 25 This is a flowchart of an example of the button assembly method provided in the embodiments of this application;

[0107] Figure 26 This is a flowchart of another example of the button assembly method provided in the embodiments of this application.

[0108] Figure label:

[0109] 10', Outer shell; 11', Frame; 111', Mounting hole; 12', Base plate; 20', Support component; 201', Vertical slot; 202', Through hole; 30', Key module; 31', Keycap; 32', Key circuit board; 33', Key spring; 70', Display screen; 71', Cover plate; 72', Display module;

[0110] 10. Outer casing; 11. Frame; 111. Mounting holes; 12. Base plate;

[0111] 20. Support component; 21. Mounting groove; 211. Positioning protrusion; 22. Wiring groove; 23. Clearance hole; 24. Through hole; 25. Snap-fit ​​groove; 26. Adhesive dispensing area; 261. First area; 262. Second area;

[0112] 30. Key module; 31. Keycap; 311. First part; 312. Second part; 313. Hook; 314. Protrusion; 315. Limiting boss; 316. Receiving groove; 317. Step; 318. Elastic element; 319. Hanging ear; 32. Key circuit board; 321. Reinforcing piece; 322. Positioning hole; 323. Data transmission element; 324. Adapter board; 33. Key spring;

[0113] 40. Limiting component; 41. First piece; 42. Second piece; 43. Base;

[0114] 50. Motherboard; 51. Electrical connectors;

[0115] 60. Support; 61. Settlement tank;

[0116] 70. Display screen; 71. Cover plate; 72. Display module. Detailed Implementation

[0117] The following are exemplary descriptions of relevant content that may be involved in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0118] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0119] In the description of this application, it should be understood that the terms "upper", "lower", "side", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the installation orientation or positional relationship, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0120] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or part as an example in the figure. It should be understood that the reference numerals are also applicable to other identical parts or parts.

[0121] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0122] A high screen-to-body ratio is a major selling point for electronic devices such as tablets, and manufacturers are currently vying to release products with narrow bezel solutions to achieve this. Tablets typically have buttons on the side of their casing for functions such as power on / off, volume control, taking photos / videos, and muting. Due to limitations in the current button assembly structure, tablet displays cannot achieve extremely narrow bezels, thus hindering further increases in screen-to-body ratio.

[0123] The following section, with reference to the accompanying drawings, details the design flaws of the current button assembly structure.

[0124] Figure 1 This is a partial schematic diagram of a tablet computer in related technologies. Figure 2 yes Figure 1 An exploded view of a tablet computer.

[0125] like Figures 1-2As shown, in the related technology of tablet computers, the button assembly structure mainly includes a shell 10', a support member 20', and a button module 30'. The shell 10' includes a base plate 12' and a frame 11' disposed on the edge of the base plate 12', with mounting holes 111' provided. The support member 20' is disposed inside the shell 10', and a vertical slot 201' is provided on the surface of the support member 20' facing the display screen 70'. A through hole 202' communicating with the vertical slot 201' is provided on the part of the support member 20' opposite to the mounting hole 111'. The button module 30' includes a keycap 31', a button circuit board 32', and a button spring 33', with the button spring 33' disposed on the button circuit board 32'.

[0126] like Figure 2 As shown, when assembling the button structure, firstly, the support member 20' is installed and fixed inside the outer casing 10'. Then, the button circuit board 32' is inserted and fixed into the vertical slot 201' from top to bottom. Finally, the keycap 31' is inserted into the side mounting hole 111', and after passing through the through hole 202', the keycap 31' extends into the vertical slot 201' and abuts against the button spring 33'. After the button structure is assembled, the display screen 70' will be glued to the support member 20' to complete the assembly of the entire tablet computer.

[0127] Figure 3 yes Figure 1 A cross-sectional view of the tablet computer, such as Figure 3 As shown, the top layer of the display screen 70' is provided with a transparent cover plate 71'. In order to prevent users from seeing the halo and internal components, and also to facilitate the installation of the cover plate 71', an opaque area is provided around the light-transmitting area of ​​the cover plate 71'. Figure 3 (The part filled with dotted lines in the middle) The display module 72' displays the image through the light-transmitting area, and the opaque area on the cover 71' is the black border that the user sees. The width of this black border directly affects the screen ratio of the tablet computer.

[0128] Continue as Figure 3 As shown, the width of the opaque area is mainly composed of the following parts: first, the adhesive width d1 between the cover plate 71' and the support member 20'; second, the step width d2 designed to create the adhesive gap; third, the width d3 of the longitudinal slot 201' used to insert the button circuit board 32'; fourth, the width d4 of the groove wall used to enclose and form the longitudinal slot 201'; fifth, the safety gap width d5 ​​of the display module 72' in the horizontal direction; and sixth, the redundant width d6 designed to avoid light leakage and the formation of a halo.

[0129] To ensure the bonding strength between the cover plate 71' and the support member 20', as well as the waterproof sealing effect of the tablet, the adhesive width d1 and the step width d2 cannot be further reduced. Similarly, to ensure the drop reliability of the display screen 70' and the user's viewing experience, the safety gap width d5 ​​and the redundancy width d6 cannot be further reduced. Therefore, to reduce the width of the opaque area on the cover plate 71' and increase the screen-to-body ratio of the tablet, improvements must be made to the button assembly structure design.

[0130] In related technologies, the width d3 of the vertical slot 201' and the width d4 of the slot wall used to enclose and form the vertical slot 201' occupy most of the width of the opaque area, which limits the ultra-narrow black border effect of the display and makes it impossible to further improve the screen ratio.

[0131] In view of this, in order to solve the technical problem of excessively wide black borders on the 70' display screen caused by the button assembly structure in related technologies, this application provides a button assembly structure, a button assembly method, and an electronic device. On the support, a mounting groove is directly formed at the position opposite to the mounting hole of the outer shell. The button circuit board is placed flat in the mounting groove. The black border area only needs to cover and shield the original glue, steps, safety gaps, and light leakage prevention redundancy. There is no need to make way for the vertical slot and its groove wall. Therefore, the width of the black border shrinks proportionally with the elimination of the vertical slot, which increases the screen ratio of the electronic device.

[0132] This application first provides an electronic device, which may also be referred to as a mobile device, terminal device, mobile terminal, or terminal. This electronic device includes, but is not limited to, handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. For example, the electronic device may include smartwatches, smart bracelets, mobile phones, personal digital assistant computers, tablets, laptops, in-vehicle computers, smart glasses, handheld game consoles, and other electronic devices with button assembly structures that require a narrow black border design for the display screen.

[0133] To more conveniently illustrate the electronic device provided in the embodiments of this application, and as an example rather than a limitation, the technical solution of this application will be described in detail below using a tablet computer as an example. Meanwhile, for the convenience of the description of the embodiments below, an XYZ coordinate system is established for the tablet computer. Specifically, the extension direction of the short side of the tablet computer is defined as the X direction, the extension direction of the long side of the tablet computer is defined as the Y direction, and the thickness direction of the tablet computer is defined as the Z direction, and the X, Y, and Z directions are all perpendicular to each other.

[0134] Figure 4 This is a schematic diagram of a tablet computer provided in an embodiment of this application.

[0135] like Figure 4 As shown in the embodiment of this application, the tablet computer includes a display screen 70, a casing 10, and a button module 30. The overall shape of the casing 10 (corresponding to the shape of the display screen 70) can be rectangular, square, racetrack-shaped, or elliptical, etc. The casing 10 provides mechanical support and protection for the entire tablet computer. The casing 10 is made of a material with sufficient hardness, such as stainless steel, ceramic, titanium alloy, aluminum alloy, copper alloy, or hard plastic, etc.

[0136] One side of the casing 10 is open, and the other side is closed. The display screen 70 covers the open side of the casing 10. The display screen 70 and the casing 10 together define the accommodating space of the tablet computer. This accommodating space is used to install various functional components of the tablet computer, such as the motherboard 50, the stand 60, the electrical connector 51, etc., which will be mentioned later.

[0137] The display screen 70 can be a Liquid Crystal Display (LCD), which incorporates Thin Film Transistors (TFTs). Since TFTs themselves do not emit light, the LCD requires a side-lit backlight. Besides the TFTs and the light source, the LCD also includes a frame, a light guide plate (LGP), and a display driver integrated circuit (DDIC). The light guide plate disperses the light emitted from the light source, ensuring that the point rays illuminate the TFTs evenly as planar rays. The light guide plate and light source are located inside the frame, which supports and protects them. The main function of the display driver chip is to send drive signals and data to the TFTs in the form of electrical signals, enabling image information such as letters and pictures to be displayed on the LCD.

[0138] The display screen 70 can also be an organic electroluminescence display (OLED). An organic electroluminescence display includes, in sequence, an optically clear adhesive (OCA), a polarizer (POL), a flexible substrate, a buffer film (BF), and a shielding cushion foam (SCF).

[0139] The display screen 70 in this application can also be other types of display screens, and this application does not limit this.

[0140] In addition, tablet computers may also include functional components such as: processor, universal serial bus (USB) interface, battery, camera module, charging management module, power management module, mobile communication module, antenna, wireless communication module, audio module, headphone jack, sensor module, and subscriber identification module (SIM) card interface.

[0141] These functional components can be modified according to user needs. It is understood that the specific embodiments described above are only one specific implementation of this application. Other ways to implement the solution of this application are also within the scope of protection of this application, and will not be elaborated here.

[0142] The following is a detailed description of the technical solution for the button assembly structure of the tablet computer in the embodiments of this application.

[0143] Figure 5 yes Figure 4 A partial schematic diagram of a tablet computer. Figure 6 yes Figure 5 An exploded view of a tablet computer. Figure 7 yes Figure 5 An exploded view of the tablet computer from another perspective.

[0144] like Figures 5-7 As shown in the embodiment of this application, the button assembly structure includes a housing 10, a support member 20, and a button module 30.

[0145] The outer casing 10 includes a base plate 12 and a frame 11, with the frame 11 surrounding the edge of the base plate 12. Optionally, the frame 11 can be fixed to the edge of the base plate 12 by means of bonding, welding, or other methods; alternatively, the frame 11 and the base plate 12 can be integrally formed by means of casting or die casting. The frame 11 has mounting holes 111, which can optionally be rectangular, square, racetrack-shaped, or elliptical in shape.

[0146] The support member 20 is disposed on the inner side of the outer casing 10, and a mounting groove 21 is formed on the support member 20 at the position opposite to the mounting hole 111. The support member 20 serves as the internal skeleton of the tablet computer, providing a base for mounting and fixing functional components such as the motherboard 50, stand 60, processor, battery, camera module, and antenna. Optionally, the support member 20 can be made of rigid plastics such as polycarbonate, or it can also be made of metal materials such as aluminum alloy. Optionally, the support member 20 can be fixedly connected to the inner side of the outer casing 10 by means of bonding, welding, snap-fitting, or fastener locking. Optionally, the shape and structure of the support member 20 can be similar to that of the outer casing 10, also having the external structural features of a frame and bottom plate; alternatively, the support member 20 can also be a frame structure.

[0147] The key module 30 includes a keycap 31, a key circuit board 32, and a key spring 33. The key spring 33 is disposed on the key circuit board 32, which is disposed in the mounting groove 21. The keycap 31 is slidably located in the mounting hole 111 and can abut against the key spring 33.

[0148] The keycap 31 is slidably located within the mounting hole 111, which can be understood as the keycap 31 being able to slide relative to the mounting hole 111 along the hole axial direction ( Figure 9 The keycap 31 slides back and forth in the X direction, and the keycap 31 can remain in place of the mounting hole 111 through limiting structures such as the ear loop 319 or the hook 313. The specific design scheme of the keycap 31 will be described in detail in the embodiments described later.

[0149] The button spring 33, also known as a dome switch, can optionally be made of ultra-thin 301 or 304 stainless steel. Located on the conductive part of the button circuit board 32, when the keycap 31 is pressed, the center point of the button spring 33 is depressed, contacting the circuitry on the button circuit board 32, thus making the circuitry on the button circuit board 32 conductive. This allows the tablet to perform functions such as power on / off, volume adjustment, photo taking, video recording, and mute. When the user releases the keycap 31, the button spring 33 elastically returns to its original position, its center point bulging outwards, and the keycap 31 is also pushed out.

[0150] Figure 8 This is a partial cross-sectional view of an example of a tablet computer provided in an embodiment of this application. Figure 9 yes Figure 8 The front view of the section plane in the image.

[0151] like Figures 8-9 As shown, in the button assembly structure of this embodiment, a mounting groove 21 is formed on the support member 20 at the position opposite to the mounting hole 111, and the button circuit board 32 is placed in the mounting groove 21. After the keycap 31 is inserted into the mounting hole 111, it directly abuts against the button spring 33. Figure 3 A comparison with the button assembly structures in related technologies shows that the button assembly structure in this embodiment does not require the design of a vertical slot 201' and a groove wall for enclosing and forming the vertical slot 201'. Therefore, the display module 72 can move closer to the edge of the cover plate 71, and the opaque area on the cover plate 71 does not need to consider blocking the vertical slot 201' and the groove wall for enclosing and forming the vertical slot 201'. Thus, when forming the opaque area of ​​the cover plate 71, the width d3 of the vertical slot 201' and the width d4 of the groove wall for enclosing and forming the vertical slot 201' can be omitted, making the opaque area on the cover plate 71 narrower, thereby reducing the width of the black border seen by the user and increasing the screen ratio of the tablet computer.

[0152] In summary, in the button assembly structure of this embodiment, the support member 20 no longer has a vertical slot 201', but instead has a mounting groove 21 directly formed at the position opposite to the mounting hole 111 of the outer casing 10. The button circuit board 32 is placed horizontally in the mounting groove 21, and the keycap 31 is inserted into the mounting hole 111 from the side to abut against the button spring 33. As a result, the circuit board insertion space on the support member 20 is completely removed from the visible area of ​​the cover plate 71, allowing the display module 72 to move horizontally towards the bezel 11. The black border area only needs to cover and shield the original glue, steps, safety gaps, and light leakage redundancy, without having to make way for the vertical slot 201' and its groove walls. This spatial shift directly brings visual benefits. The black border no longer serves to shield the vertical slot 201', so the width of the black border shrinks proportionally with the removal of the vertical slot 201'. This increases the screen-to-body ratio of the tablet computer, providing users with a wider field of view and improving the overall user experience.

[0153] Furthermore, the keycap 31 extends directly into the mounting groove 21 through the mounting hole 111 and abuts against the key spring 33. This eliminates the transition section within the through hole 202' found in related technologies, thus reducing the thickness of the keycap 31. Figure 9 The dimensions in the X direction are significantly reduced, and the thickness of the keycap 31 is reduced, which shortens the distance between the finger's force application point and the key spring 33's bearing point, i.e., reduces the torque. The keycap 31 is less prone to tilting, and the keycap 31 moves stably when pressed, and the rebound is faster, which can improve the user's pressing feel.

[0154] Figure 10 This is an exploded view of the display screen 70 and the support member 20 provided in the embodiments of this application. Figure 11 yes Figure 9 A magnified view of a portion of the image.

[0155] like Figure 10 and Figure 11As shown, in one embodiment provided in this application, the support member 20 is provided with an adhesive dispensing area 26 for bonding with the display screen 70, that is, an adhesive dispensing area 26 on the support member 20 for bonding with the cover plate 71. The adhesive dispensing area 26 is generally in the shape of a continuous ring, which matches the edge shape of the cover plate 71. The projections of the button circuit board 32 and the adhesive dispensing area 26 on the first reference surface at least partially overlap, and the first reference surface is perpendicular to the thickness direction of the base plate 12.

[0156] The first reference plane can be understood as Figure 11 In the XY plane, the thickness direction of the base plate 12 can be understood as the thickness direction of the tablet computer, that is... Figure 11 In the Z direction, the button circuit board 32 and the dispensing area 26 are projected onto the XY plane along the Z direction, and the projections of the button circuit board 32 and the dispensing area 26 at least partially overlap.

[0157] In related technologies, the button circuit board 32 and the adhesive dispensing area 26 are staggered in the Z direction. However, in this embodiment, the above limitation is essentially to stack the originally staggered button circuit board 32 and adhesive dispensing area 26 along the Z direction, further reducing the ineffective space occupied by the support member 20 at the edge of the cover plate 71, thereby making it easier to narrow the black edge on the cover plate 71.

[0158] Continue as Figure 10 As shown, in one embodiment provided in this application, the dispensing area 26 includes a first area 261 and a second area 262. The first area 261 corresponds to the mounting groove 21, and the second area 262 is located at both ends of the first area 261. The first area 261 and the second area 262 form a continuous ring. The widths of the first area 261 and the second area 262 are equal.

[0159] The first region 261 corresponds to the position of the mounting groove 21. It can be understood as the part covered by the projection of the mounting groove 21 onto the plane where the dispensing area 26 is located.

[0160] Return to Figure 2 As shown, in related technologies, since the surface of the support member 20 facing the display screen 70 has a vertical slot 201', the dispensing area 26 of the support member 20 will be irregular in shape in order to avoid the slot opening of the vertical slot 201', which will increase the dispensing difficulty of the dispensing equipment. In this embodiment, the width of the first area 261 and the second area 262 are the same, and the entire dispensing area 26 is a straight line of equal width. The dispensing equipment does not need to change speed or avoid the slot, the dispensing speed and pressure remain constant, and the glue width and height are uniform without any gaps. This not only eliminates the defects of glue overflow and glue shortage caused by irregular paths, but also eliminates the need for real-time correction by the vision system, shortens the programming path, and improves dispensing efficiency.

[0161] In addition, the uniform adhesive lines ensure consistent bonding stress and balanced adhesive strength throughout the cover plate 71, effectively preventing stress concentration when the tablet computer is subjected to external impact, and reducing the risk of peeling between the cover plate 71 and the support member 20.

[0162] Figure 12 This is a schematic diagram showing the disassembled shell 10, button module 30 and support member 20 provided in the embodiments of this application.

[0163] like Figure 12 As shown, in one embodiment provided in this application, the button circuit board 32 is provided with a data transmission component 323. The support member 20 is provided with a wiring groove 22 for accommodating the data transmission component 323. One end of the wiring groove 22 is connected to the mounting groove 21, and the width of the wiring groove 22 is smaller than the width of the button circuit board 32.

[0164] The data transmission device 323 is electrically connected to the motherboard 50 of the tablet computer to supply power to the button circuit board 32 and transmit signals.

[0165] In this embodiment, the support member 20 is designed with a wiring groove 22. During assembly, the data transmission component 323 can be embedded in the wiring groove 22. The groove wall provides continuous protection for the data transmission component 323, preventing wire breakage due to pulling or bending during drops. The width of the wiring groove 22 is smaller than the width of the button circuit board 32. The button circuit board 32 can be supported by the shoulders at both ends of the groove, preventing the button circuit board 32 from coming out of the wiring groove 22.

[0166] Optionally, the button circuit board 32 can be a flexible printed circuit (FPC) or a printed circuit board (PCB).

[0167] Alternatively, the data transmission component 323 may be a flexible flat cable (FFC) or a flexible circuit board.

[0168] Alternatively, the data transmission component 323 can be electrically connected to the motherboard 50 via a zero insertion force (ZIF) connector, a wire-to-board (WTB) connector, or a board-to-board (BTB) connector.

[0169] Optionally, the motherboard 50 can be a printed circuit board. The material of the motherboard 50 can be a copper-clad ceramic board (DirectBond Ceramic, DBC), an active metal brazing ceramic board (AMB), an aluminum-clad ceramic board (Direct Bond Aluminum, DBA), etc.

[0170] Continue as Figure 12 As shown, in one embodiment provided in this application, the wiring groove 22 is disposed on the side of the support member 20 facing the base plate 12.

[0171] In this embodiment, the wiring groove 22 is opened on the side of the support member 20 facing the base plate 12. The data transmission component 323 is sandwiched between the support member 20 and the base plate 12. The groove wall and the base plate 12 together form a closed channel. When falling, the data transmission component 323 is not directly impacted by other protruding parts, which ensures the reliability of the data transmission component 323 and thus ensures the electrical connection stability between the button circuit board 32 and the motherboard 50.

[0172] In addition to the above-mentioned connectors, the data transmission device 323 and the motherboard 50 can also be electrically connected through the electrical connector 51. The specific design scheme is as follows.

[0173] Figure 13 This is a partial cross-sectional view of another example of a tablet computer provided in the embodiments of this application.

[0174] like Figure 13 As shown, and in combination Figure 12 As shown, in one embodiment provided in this application, a converter plate 324 is provided at the end of the data transmission device 323 facing away from the button circuit board 32. The support member 20 has a clearance hole 23, which communicates with the wiring groove 22. The converter plate 324 is located in the clearance hole 23 and is fixedly connected to the base plate 12. The button assembly structure also includes a bracket 60 and a main board 50. The bracket 60 is fixedly connected to the support member 20 and clamps the main board 50 between the bracket 60 and the support member 20. The main board 50 is provided with an electrical connector 51, such as a conductive spring or conductive foam. The electrical connector 51 is located in the clearance hole 23 and elastically abuts against the converter plate 324.

[0175] In this embodiment, the bracket 60 and the support member 20 are fixedly connected, forming a clamp structure with the bracket 60, main board 50, support member 20, and base plate 12. Electrical connectors 51 (such as conductive springs or conductive foam) and adapter plates 324 are concealed within the clearance holes 23 of the support member 20. This compresses the electrical connectors 51 between the adapter plates 324 and the main board 50, creating vertical conductivity between the main board 50 and the adapter plates 324. This design eliminates the need to plug and unplug connectors such as BTB connectors, simplifying the assembly process.

[0176] In addition, the bracket 60 and the support 20 can be locked together by screws. The compression path is in the Z direction, and a constant pressure is automatically achieved as the screws are tightened. The contact resistance of the conductive spring or conductive foam is stable, and the shock absorption effect of the conductive spring or conductive foam is good when falling or rolling, which can further ensure the electrical connection stability between the button circuit board 32 and the main board 50.

[0177] Alternatively, the adapter board 324 can be a flexible circuit board or a printed circuit board.

[0178] Continue as Figure 12 As shown, in one embodiment provided in this application, the button circuit board 32, the data transmission device 323, and the adapter board 324 are integrally formed flexible circuit boards.

[0179] In this embodiment, the button circuit board 32, the data transmission component 323 and the adapter board 324 are integrally formed using the same flexible circuit board, eliminating the need for welding, conductive adhesive bonding and connector insertion. The entire board has no broken joints, eliminating the risk of solder joint cracking when dropped, thus improving reliability. Furthermore, the integrated structure achieves the effect of being lightweight, thin and easy to assemble.

[0180] Continue as Figure 12 As shown, in one embodiment provided in this application, a reinforcing piece 321 is provided on the side of the button circuit board 32 facing away from the keycap 31, and the button circuit board 32 is fixedly connected to the bottom of the mounting groove 21 through the reinforcing piece 321.

[0181] In this embodiment, after the reinforcing sheet 321 is attached to the back of the button circuit board 32, a local rigid area is formed. When placed into the mounting groove 21, it is flattened by the reinforcing sheet 321, and can be surface-to-surface bonded or thermo-pressed to the bottom of the groove without the need for additional screws. The reinforcing sheet 321 improves the rigidity of the button area, so the button circuit board 32 does not warp or deform when pressed, the keycap 31 has a stable travel, and the user's pressing feel is guaranteed.

[0182] Continue as Figure 12 As shown, in one embodiment provided in this application, the button circuit board 32 and the reinforcing sheet 321 are provided with positioning holes 322, and the bottom of the mounting groove 21 is provided with positioning protrusions 211 that are inserted and engaged with the positioning holes 322.

[0183] In this embodiment, the positioning protrusion 211 engages with the positioning holes 322 of the key circuit board 32 and the reinforcing plate 321, automatically centering upon insertion without the need for additional clamps. The positioning protrusion 211 and the positioning holes 322 ensure that the reinforcing plate 321 fits flat against the bottom of the groove, preventing the key circuit board 32 from slipping when pressed and ensuring stable keycap travel, further guaranteeing the user's pressing feel.

[0184] Continue as Figure 12As shown, in one embodiment provided in this application, a reinforcing piece 321 is provided on the side of the adapter plate 324 facing away from the main board 50, and the adapter plate 324 is fixedly connected to the base plate 12 through the reinforcing piece 321.

[0185] In this embodiment, a reinforcing piece 321 is added to the back of the adapter plate 324 and is bonded to the base plate 12 to form a rigid support, preventing the adapter plate 324 from warping when the conductive spring or conductive foam is under pressure. The reinforcing piece 321 can disperse pressure, avoid local bending of the adapter plate 324, ensure continuous and stable contact between the conductive spring or conductive foam and the main board 50, and improve the reliability of electrical connection.

[0186] Continue as Figure 12 As shown, in one embodiment provided in this application, the adapter plate 324 and the reinforcing plate 321 are provided with positioning holes 322, and the wall of the clearance hole 23 is provided with positioning protrusions 211 that are engaged with the positioning holes 322.

[0187] In this embodiment, the positioning protrusion 211 and the positioning hole 322 are engaged in a socket fit. When the adapter plate 324 is inserted into the clearance hole 23, it is automatically centered. This ensures precise alignment between the conductive spring or conductive foam and the pads of the adapter plate 324 without the need for additional clamps. Insertion and positioning eliminate lateral offset, ensure consistent contact resistance, avoid conduction failure caused by pressure bias, and prevent the adapter plate 324 from sliding and impacting the data transmission component 323 during drops, thereby improving the reliability of electrical connections and assembly efficiency.

[0188] In another embodiment provided in this application, the button circuit board 32 is a flexible circuit board, and the side of the button circuit board 32 facing away from the keycap 31 is directly bonded to the bottom of the mounting groove 21.

[0189] Unlike related technologies where the button circuit board 32 is inserted into the vertical slot 201' from top to bottom, in this embodiment, since the mounting slot 21 is opened laterally, the button circuit board 32 can be installed horizontally, thus eliminating the need for a reinforcing piece 321 to directly bond to the bottom of the slot and support the button circuit board 32 through the bottom of the slot. This saves material, eliminates the tolerance of the reinforcing piece 321, allows the button circuit board 32 to be closer to the bottom of the slot, provides a stable pressing feel, and reduces the overall thickness of the button circuit board 32, allowing for a reduction in the processing depth of the mounting slot 21. This, in turn, ensures the structural strength of the support member 20 and improves the overall shock resistance of the tablet computer.

[0190] Figure 14 This is a schematic diagram of an example of a keycap 31 provided in an embodiment of this application.

[0191] like Figure 14As shown, in one embodiment provided in this application, the keycap 31 is made of elastic materials such as rubber, resin, and elastomer. The two ends of the keycap 31 extend outward to form lugs 319, making the overall outline of the keycap 31 larger than the opening of the mounting hole 111. The keycap 31 is pressed against the mounting hole 111 to deform the lugs 319. After the lugs 319 pass through the mounting hole 111, they return to their original shape on the inner side of the frame 11, thereby limiting the keycap 31 as a whole on the frame 11 and preventing the keycap 31 from coming out of the mounting hole 111.

[0192] Optionally, the resin material includes, but is not limited to, polyvinyl chloride, polypropylene, polyethylene terephthalate, ethylene-vinyl acetate copolymer, polybutylene terephthalate, polycarbonate, polyoxymethylene, etc.

[0193] Optionally, the rubber material includes, but is not limited to, silicone rubber, natural rubber, emulsion styrene-butadiene rubber, solution styrene-butadiene rubber, cis-butadiene rubber, isoprene rubber, chloroprene rubber, ethylene propylene rubber, butyl rubber, etc.

[0194] Optionally, the elastomer material includes, but is not limited to, styrene-based elastomers, polyurethane elastomers, polyolefin elastomers, polyester elastomers, etc.

[0195] In addition to designing ear loops 319 on keycap 31 to limit keycap 31, hooks 313 can also be designed on keycap 31, and a limiting component 40 that cooperates with hooks 313 can be added to limit keycap 31. The specific design scheme is as follows.

[0196] Figure 15 yes Figure 5 An exploded view of another example of a tablet computer.

[0197] like Figure 15 As shown, in one embodiment provided in this application, the bottom of the mounting groove 21 has a through hole 24, and the keycap 31 is provided with a hook 313 passing through the through hole 24. The key assembly structure also includes a limiting member 40, which is disposed on the side of the support member 20 opposite to the mounting groove 21, and cooperates with the hook 313 passing through the through hole 24 to limit the keycap 31 from falling outward.

[0198] In this embodiment, the hook 313 passes through the through hole 24 at the bottom of the groove and engages with the limiting member 40 on the back, eliminating the need for elastic ear loops 319 around the keycap 31. Compared to ear loops 319 made of elastic materials such as rubber or elastomers, rigid fastening eliminates the risks of aging and rebound failure of materials such as rubber or elastomers, and ensures the limiting reliability of the keycap 31 even after long-term use.

[0199] Figure 16 This is a schematic diagram of the limiting member 40 provided in the embodiments of this application.

[0200] like Figure 16As shown, in one embodiment provided in this application, the limiting member 40 is a sheet-like body, including a first sheet 41, a second sheet 42 connected to the first sheet 41, and a base 43.

[0201] Optionally, the limiting element 40 may be made of 301 or 304 stainless steel.

[0202] Alternatively, the limiting member 40 can also be other structures, such as a pin, a limiting arm, etc., as long as it can limit the hook 313 to the back side of the support member 20.

[0203] Figure 17 This is a partial cross-sectional view of another example of a tablet computer provided in the embodiments of this application. Figure 18 yes Figure 17 The front view of the section plane in the image.

[0204] like Figures 17-18 As shown, in one embodiment provided in this application, the housing 10 is provided with a display screen 70, which includes a cover plate 71 and a display module 72 stacked together. The projections of the display module 72 and the hook 313 on the second reference surface do not overlap. And / or, the projections of the display module 72 and the limiting member 40 on the second reference surface do not overlap, and the second reference surface is parallel to the thickness direction of the base plate 12.

[0205] The second reference plane can be understood as Figure 18 In the YZ plane, the display module 72 and the hook 313 are projected onto the YZ plane along the X direction, and the projections of the display module 72 and the hook 313 do not overlap. Also, the display module 72 and the limiting member 40 are projected onto the YZ plane along the X direction, and the projections of the display module 72 and the limiting member 40 do not overlap.

[0206] In this embodiment, by limiting the position as described above, the hook 313 or the limiting member 40 can be prevented from interfering with the display module 72, ensuring that the display module 72 can move closer to the frame 11, thereby ensuring the narrow black border effect on the display screen 70.

[0207] In addition, it can prevent the hook 313 or the limiting part 40 from hitting the edge of the display module 72 when it falls, eliminating the risk of bright lines and display failure, and achieving a narrower black border while achieving higher safety.

[0208] Figure 19 This is an exploded view of the bracket 60, the limiting member 40, and the support member 20 provided in the embodiments of this application. Figure 20 yes Figure 19 An assembly diagram of the bracket 60, the limiting member 40, and the support member 20.

[0209] like Figures 19-20As shown, in one embodiment provided in this application, the first piece 41 is pressed against the through hole 24 of the support member 20 by the hook 313, and the base 43 is bent and elastically abuts against the snap-fit ​​groove 25 provided on the support member 20. The bracket 60 is fixedly connected to the support member 20, and clamps the second piece 42 and the main board 50 between the bracket 60 and the support member 20.

[0210] In this case, the first piece 41 is pressed by the hook 313 into the through hole 24 of the support member 20. This is the state when the keycap 31 is not pressed by the user. In this state, the key spring 33 naturally protrudes outward, thereby pushing the keycap 31 outward as a whole, while the hook 313 presses the first piece 41 against the through hole 24 of the support member 20.

[0211] In this embodiment, the base 43 of the limiting member 40 is secured by the snap-fit ​​groove 25, and the bracket 60 and the support member 20 are fixedly connected to form a clamping structure, which clamps and fixes the second piece 42 between the bracket 60 and the motherboard 50. This double fixation ensures the reliable installation of the limiting member 40 on the back side of the support member 20, providing a stable limit for the keycap 31.

[0212] Optionally, the second piece 42 can be a straight plate, arranged perpendicularly to the first piece 41, and a notch can be provided at the opening of the snap-fit ​​groove 25 to avoid the second piece 42; or, as Figure 19 As shown, the second piece 42 is in the shape of a bent step, which can extend between the bracket 60 and the motherboard 50 after avoiding the groove wall of the card slot 25.

[0213] In another embodiment provided in this application, the limiting member 40 may not need to be designed with a second piece 42. The limiting member 40 only includes a connected first piece 41 and a base 43. The base 43 is snapped into the snap-fit ​​groove 25, thereby allowing the limiting member 40 to be installed and fixed on the support member 20.

[0214] Figure 21 yes Figure 20 A schematic diagram of the bracket 60, the limiting member 40, and the support member 20 from another perspective.

[0215] like Figure 21 As shown, in one embodiment provided in this application, the bracket 60 has a groove 61 for accommodating the second piece 42.

[0216] In this embodiment, a groove 61 is provided in the bracket 60 to accommodate the second piece 42, so that the second piece 42 can sink into the surface of the bracket 60 and avoid the second piece 42 protruding from the surface of the bracket 60 and causing damage to the motherboard 50.

[0217] Figure 22This is a schematic diagram of another example of the keycap 31 provided in the embodiments of this application. Figure 23 yes Figure 22 An exploded view of keycap 31 in the image.

[0218] like Figures 22-23 As shown, in one embodiment provided in this application, the keycap 31 includes a first part 311 and a second part 312. The first part 311 is pressed by the user and has a receiving groove 316 on the side facing the key circuit board 32. The second part 312 is located in the receiving groove 316 and is used to abut against the key spring 33.

[0219] In this embodiment, the keycap 31 is divided into a first part 311 and a second part 312. The first part 311 and the second part 312 can achieve functional decoupling through material selection. The first part 311 bears the pressing load, does not deform or become oily, and gives the keycap 31 a high-end feel and an impact-resistant frame. The second part 312 is hidden in the receiving groove 316, is soft in texture, and flexibly fits the key spring 33, which reduces rebound noise and avoids the corners of hard materials scratching the surface of the key spring 33. The first part 311 can be made of anodized aluminum, stainless steel, titanium alloy, ceramic, hard engineering plastic, etc., taking into account heat dissipation, electromagnetic shielding, or decorative needs. The second part 312 can be made of silicone, rubber, thermoplastic elastomer, polyurethane, etc., utilizing its compressibility to absorb overpressure and extend the fatigue life of the key spring 33.

[0220] The "oily" mentioned above refers to the surface of keycap 31 becoming shiny, slippery, and greasy from prolonged friction with fingers. This is because the micro-textures on the surface of the plastic keycap 31 are smoothed out after long-term friction, allowing sebum to seep in and form a reflective oil film, which is both unsightly and slippery. Keycaps that don't "oil" are those made of materials that don't easily develop a shiny oil film. Materials like metals and ceramics, which are hard or non-oil-repellent, retain their original matte texture and dry feel even after prolonged pressing.

[0221] Optionally, the number of receiving slots 316 can be one or more.

[0222] Continue as Figures 22-23 As shown, in one embodiment provided in this application, the second part 312 is provided with a protrusion 314 for abutting against the button spring 33, and the second part 312 is also provided with a limiting protrusion 315 with a height greater than the protrusion 314.

[0223] In this embodiment, by designing a limiting boss 315 higher than the protrusion 314 on the second part 312, the limiting boss 315 can abut against the key circuit board 32 in advance at the end of the keycap 31's travel, preventing the keycap 31 from being pressed down too much. This not only prevents the protrusion 314 from excessively squeezing the key spring 33 and causing damage, but also provides rigid stop feedback for the fingers, improving the user's pressing feel.

[0224] Figure 24This is a partial cross-sectional view of another example of a tablet computer provided in the embodiments of this application.

[0225] like Figure 24 As shown, and in combination Figure 23 As shown, in one embodiment provided in this application, the first part 311 is provided with a step 317, and an elastic element 318 is compressed between the step 317 and the button circuit board 32.

[0226] In this embodiment, the elastic element 318 is compressed between the step 317 and the key circuit board 32. In the unpressed state, the elastic element 318 pushes the entire keycap 31 outwards via the step 317. The elastic element 318 continuously pushes the keycap 31 outwards with the help of the step 317, ensuring the keycap 31 is in a stable, suspended position before a finger touches it, without any looseness. When pressed, the elastic element 318 is further compressed, and the stored rebound force, together with the key spring 33, provides a double reset for the keycap 31, making the keycap 31's rebound more responsive. Overall, this improves the product quality of the tablet and the user's pressing feel.

[0227] Optionally, the elastic element 318 can be foam, spring, rubber block, etc.

[0228] Optionally, there are two receiving slots 316, and a step 317 is disposed between the two receiving slots 316.

[0229] Figure 25 This is a flowchart illustrating an example of the button assembly method provided in this application. Figure 25 (a) in the figure is an exploded view of the support member 20 and the button circuit board 32; Figure 25 (b) is an assembly diagram of the support member 20 and the button circuit board 32; Figure 25 (c) in the diagram is an exploded view of the outer shell 10 and the support member 20; Figure 25 (d) in the diagram is an exploded view of the outer shell 10 and the keycap 31; Figure 25 (e) in the diagram is an exploded view of the bracket 60, motherboard 50, and support component 20; Figure 25 (f) in the diagram is an assembly diagram of bracket 60, motherboard 50 and support component 20.

[0230] like Figure 25 As shown in the figure, this application embodiment also provides a button assembly method, including the following steps.

[0231] Step 101, as follows Figure 25 As shown in (a) and (b), the button circuit board 32 is placed into the mounting groove 21 opened on the side of the support member 20 and fixed in the mounting groove 21.

[0232] Optionally, the button circuit board 32 can be fixed to the bottom of the mounting groove 21 by adhesive.

[0233] Step 102, as follows Figure 25 As shown in (b), the data transmission component 323 led out from the button circuit board 32 is placed in the wiring groove 22 opened on the support member 20.

[0234] Step 103, as follows Figure 25 As shown in (c), the support member 20 is fixed to the inside of the housing 10.

[0235] Optionally, the support member 20 can be fixed to the inside of the housing 10 by adhesive.

[0236] Step 104, as follows Figure 25 As shown in (d), the keycap 31 is installed in the mounting hole 111 of the housing 10.

[0237] Optionally, the keycap 31 is provided with a flexible lug 319. After passing through the mounting hole 111, the lug 319 returns to its original position at the opening on the other side of the mounting hole 111, thereby limiting the keycap 31 to the outer shell 10 and preventing the keycap 31 from coming out of the mounting hole 111.

[0238] Step 105, as follows Figure 25 As shown in (e), the adapter plate 324 extending from the button circuit board 32 is placed in the clearance hole 23 opened on the support member 20, and the adapter plate 324 is fixed to the bottom plate 12 of the housing 10.

[0239] Step 106, as follows Figure 25 As shown in (e), align the electrical connector 51 on the motherboard 50 with the adapter board 324.

[0240] Step 107, as follows Figure 25 As shown in (f), the bracket 60 is fixed on the support member 20 so that the bracket 60, the main board 50 and the support member 20 are pressed together in sequence, so that the main board 50 and the adapter board 324 are electrically connected through the electrical connector 51, thus completing the assembly of the button structure.

[0241] Optionally, when the bracket 60 is fixed to the support member 20, the following design can be adopted: the main board 50 has a clearance notch, and the support member 20 has a threaded post. The threaded post passes through the clearance notch and abuts against the bracket 60. Then, a screw is screwed into the threaded post to lock the bracket 60 and the support member 20.

[0242] Figure 26 This is a flowchart of another example of the button assembly method provided in the embodiments of this application. Wherein, Figure 26 (a) in the figure is an exploded view of the support member 20 and the button circuit board 32; Figure 26 (b) is an assembly diagram of the support member 20 and the button circuit board 32; Figure 26 (c) in the diagram is an exploded view of the outer shell 10 and the support member 20; Figure 26 (d) in the diagram is an exploded view of the outer shell 10 and the keycap 31; Figure 26 (e) in the diagram is an exploded view of the bracket 60, main board 50, limiting member 40, and support member 20. Figure 26 (f) is an assembly diagram of bracket 60, main board 50, limiting component 40, and support component 20.

[0243] like Figure 26 As shown, in one embodiment provided in this application, the button assembly method includes the following steps.

[0244] Step 201, as follows Figure 26 As shown in (a) and (b), the button circuit board 32 is placed into the mounting groove 21 opened on the side of the support member 20 and fixed in the mounting groove 21.

[0245] Optionally, the button circuit board 32 can be fixed to the bottom of the mounting groove 21 by adhesive.

[0246] Step 202, as follows Figure 26 As shown in (b), the data transmission component 323 led out from the button circuit board 32 is placed in the wiring groove 22 opened on the support member 20.

[0247] Step 203, as follows Figure 26 As shown in (c), the support member 20 is fixed to the inside of the housing 10.

[0248] Optionally, the support member 20 can be fixed to the inside of the housing 10 by adhesive.

[0249] Step 204, as follows Figure 26 As shown in (d), the hook 313 of the keycap 31 passes through the through hole 24 opened at the bottom of the mounting groove 21.

[0250] Step 205, as follows Figure 26 As shown in (e), on the side of the support member 20 facing away from the mounting groove 21, the limiting member 40 is inserted between the hook 313 and the support member 20.

[0251] Step 206, as follows Figure 26 As shown in (e), the motherboard 50 is placed on the support member 20, and the second piece 42 of the limiting member 40 is placed on the motherboard 50.

[0252] Optionally, the limiting member 40 also includes a curved base 43, which, when the second piece 42 of the limiting member 40 is placed on the motherboard 50, also elastically abuts against the snap-fit ​​groove 25 provided on the support member 20.

[0253] Step 207, as follows Figure 26 As shown in (e), the adapter plate 324 extending from the button circuit board 32 is placed in the clearance hole 23 opened on the support member 20, and the adapter plate 324 is fixed to the bottom plate 12 of the housing 10.

[0254] Step 208, as follows Figure 26 As shown in (e), align the electrical connector 51 on the motherboard 50 with the adapter board 324.

[0255] Step 209, as follows Figure 26 As shown in (f), the bracket 60 is fixed to the support member 20 so that the bracket 60, the second piece 42, the main board 50 and the support member 20 are pressed together in sequence.

[0256] In step 209, the bracket 60 is fixed to the support member 20 so that the bracket 60, the second piece 42, the main board 50, and the support member 20 are pressed together in sequence. This not only clamps and fixes the second piece 42 of the limiting member 40 between the main board 50 and the bracket 60, but also connects the main board 50 and the adapter board 324 electrically through the electrical connector 51. The limiting of the keycap 31 and the electrical connection between the key circuit board 32 and the main board 50 are completed simultaneously in one step. This method has the advantages of fewer steps and higher assembly efficiency.

[0257] Optionally, when the bracket 60 is fixed to the support member 20, the following design can be adopted: the main board 50 has a clearance notch, and the support member 20 has a threaded post. The threaded post passes through the clearance notch and abuts against the bracket 60. Then, a screw is screwed into the threaded post to lock the bracket 60 and the support member 20.

[0258] In one embodiment provided in this application, the button assembly method includes the following steps.

[0259] Step 301: Insert the button circuit board 32 into the mounting groove 21 opened on the support member 20 from the side of the support member 20, and fix the button circuit board 32 in the mounting groove 21.

[0260] Step 302: Pass the data transmission component 323 led out from the button circuit board 32 through the wiring hole opened on the support member 20.

[0261] Step 303: Fix the support 20 to the inside of the outer shell 10.

[0262] Step 304: Install the keycap 31 into the mounting hole 111 of the housing 10.

[0263] Step 305: Connect the connector on the data transmission device 323 to the connector on the motherboard 50.

[0264] Alternatively, the connector on the data transmission device 323 may be a BTB plug, and the connector on the motherboard 50 may be a BTB socket.

[0265] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A button assembly structure, characterized in that, include: The outer casing (10) includes a base plate (12) and a frame (11) disposed on the edge of the base plate (12), the frame (11) having mounting holes (111). A support member (20) is disposed on the inner side of the outer shell (10), and a mounting groove (21) is provided on the support member (20) at the part opposite to the mounting hole (111). The button module (30) includes a keycap (31), a button circuit board (32), and a button spring (33). The button spring (33) is disposed on the button circuit board (32). The button circuit board (32) is disposed entirely in the mounting groove (21). The keycap (31) is slidably limited in the mounting hole (111) and can abut against the button spring (33). The support member (20) is provided with a dispensing area (26) for bonding with the display screen (70); the projections of the button circuit board (32) and the dispensing area (26) on the first reference surface at least partially overlap, and the first reference surface is perpendicular to the thickness direction of the base plate (12); The dispensing area (26) includes a first area (261) and a second area (262). The first area (261) corresponds to the position of the mounting groove (21), and the second area (262) is located at both ends of the first area (261). The widths of the first area (261) and the second area (262) are equal.

2. The button assembly structure according to claim 1, characterized in that, The button circuit board (32) is provided with a data transmission component (323); The support member (20) is provided with a wiring groove (22) for accommodating the data transmission member (323). One end of the wiring groove (22) is connected to the mounting groove (21). The width of the wiring groove (22) is smaller than the width of the button circuit board (32).

3. The button assembly structure according to claim 2, characterized in that, The wiring channel (22) is located on the side of the support member (20) facing the base plate (12).

4. The button assembly structure according to claim 3, characterized in that, The data transmission device (323) has an adapter plate (324) at one end away from the button circuit board (32); The support member (20) has a clearance hole (23), which is connected to the wiring groove (22). The adapter plate (324) is located in the clearance hole (23) and is fixedly connected to the base plate (12). The button assembly structure also includes a bracket (60) and a motherboard (50). The bracket (60) is fixedly connected to the support member (20) and clamps the motherboard (50) between the bracket (60) and the support member (20). The motherboard (50) is provided with an electrical connector (51). The electrical connector (51) is located in the clearance hole (23) and elastically abuts against the adapter plate (324).

5. The button assembly structure according to claim 4, characterized in that, The button circuit board (32), the data transmission component (323), and the adapter board (324) are integrally formed flexible circuit boards.

6. The button assembly structure according to any one of claims 1-5, characterized in that, The button circuit board (32) has a reinforcing piece (321) on the side opposite to the keycap (31), and the button circuit board (32) is fixedly connected to the bottom of the mounting groove (21) through the reinforcing piece (321).

7. The button assembly structure according to claim 6, characterized in that, The button circuit board (32) and the reinforcing plate (321) are provided with positioning holes (322), and the bottom of the mounting groove (21) is provided with positioning protrusions (211) that are engaged with the positioning holes (322).

8. The button assembly structure according to any one of claims 1-5 and 7, characterized in that, The bottom of the mounting groove (21) has a through hole (24), and the keycap (31) is provided with a hook (313) that passes through the through hole (24). The key assembly structure also includes a limiting member (40), which is disposed on the side of the support member (20) opposite to the mounting groove (21) and cooperates with the hook (313) passing through the through hole (24) to restrict the keycap (31) from coming out.

9. The button assembly structure according to claim 8, characterized in that, The outer casing (10) is provided with a display screen (70), which includes a cover plate (71) and a display module (72) stacked together. The projections of the display module (72) and the hook (313) on the second reference plane do not overlap; And / or, the projections of the display module (72) and the limiting member (40) on the second reference surface do not overlap, and the second reference surface is parallel to the thickness direction of the base plate (12).

10. The button assembly structure according to claim 8, characterized in that, The limiting member (40) is a sheet-like body, including a first sheet (41) and a base (43) connected together. The first sheet (41) is pressed by the hook (313) at the through hole (24) of the support member (20). The base (43) is curved and elastically abuts against the snap-fit ​​groove (25) provided on the support member (20).

11. The button assembly structure according to claim 10, characterized in that, The limiting member (40) also includes a second piece (42) connected to the first piece (41). The button assembly structure also includes a bracket (60) and a motherboard (50). The bracket (60) is fixedly connected to the support member (20) and clamps the second piece (42) and the motherboard (50) between the bracket (60) and the support member (20).

12. The button assembly structure according to claim 11, characterized in that, The support (60) has a groove (61) for accommodating the second piece (42).

13. The button assembly structure according to any one of claims 1-5, 7, and 9-12, characterized in that, The keycap (31) includes a first part (311) and a second part (312). The first part (311) is pressed by the user and has a receiving groove (316) on the side facing the key circuit board (32). The second part (312) is located in the receiving groove (316) and is used to abut against the key spring (33).

14. The button assembly structure according to claim 13, characterized in that, The second part (312) is provided with a protrusion (314) for abutting against the button spring (33), and the second part (312) is also provided with a limiting boss (315) with a height greater than the protrusion (314).

15. The button assembly structure according to claim 13, characterized in that, The first part (311) is provided with a step (317), and an elastic element (318) is compressed between the step (317) and the button circuit board (32).

16. The button assembly structure according to claim 1, characterized in that, The button circuit board (32) is a flexible circuit board, and the side of the button circuit board (32) facing away from the keycap (31) is directly bonded to the bottom of the mounting groove (21).

17. A button assembly method, characterized in that, For assembling the button assembly structure according to any one of claims 1-16, the button assembly method includes: The entire button circuit board (32) is placed into the mounting groove (21) opened on the support member (20) from the side and the button circuit board (32) is fixed in the mounting groove (21); The support member (20) is fixed to the inside of the outer casing (10); Install the keycap (31) into the mounting hole (111) of the housing (10).

18. The button assembly method according to claim 17, characterized in that, Prior to the step of fixing the support (20) to the inside of the housing (10), the method further includes: The data transmission device (323) led out from the button circuit board (32) is placed in the wiring groove (22) opened on the support (20).

19. The button assembly method according to claim 17, characterized in that, The step of installing the keycap (31) into the mounting hole (111) of the housing (10) includes: The hook (313) of the keycap (31) passes through the through hole (24) opened at the bottom of the mounting groove (21). On the side of the support member (20) facing away from the mounting groove (21), the limiting member (40) is inserted between the hook (313) and the support member (20).

20. The button assembly method according to claim 19, characterized in that, The step of inserting the limiting member (40) between the hook (313) and the support member (20) further includes: Place the motherboard (50) on the support member (20), and place the second piece (42) of the limiting member (40) on the motherboard (50); Fix the bracket (60) to the support member (20) so that the bracket (60), the second piece (42), the main board (50) and the support member (20) are pressed together in sequence.

21. The button assembly method according to claim 20, characterized in that, Before the step of fixing the bracket (60) to the support member (20) so that the bracket (60), the second piece (42), the main board (50) and the support member (20) are pressed together in sequence, the method further includes: Place the adapter plate (324) extending from the button circuit board (32) into the clearance hole (23) opened on the support member (20), and fix the adapter plate (324) to the bottom plate (12) of the outer shell (10). Align the electrical connector (51) on the motherboard (50) with the adapter board (324).

22. The button assembly method according to claim 17, characterized in that, The step of installing the keycap (31) into the mounting hole (111) of the housing (10) further includes: Place the adapter plate (324) extending from the button circuit board (32) into the clearance hole (23) opened on the support member (20), and fix the adapter plate (324) to the bottom plate (12) of the outer shell (10). Align the electrical connector (51) on the motherboard (50) with the adapter board (324); Fix the bracket (60) to the support member (20) so that the bracket (60), the motherboard (50) and the support member (20) are pressed together in sequence.

23. An electronic device, characterized in that, Includes the button assembly structure as described in any one of claims 1-16.

24. The electronic device according to claim 23, characterized in that, It also includes a display screen (70), which includes a cover plate (71) and a display module (72) stacked together. The cover plate (71) covers the frame (11), and the cover plate (71) and the outer shell (10) enclose a receiving space for accommodating the functional components of the electronic device.

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