Key assembly structure, key assembly method and electronic equipment

Abstract

The invention discloses a key assembling structure, a key assembling method and electronic equipment. The key assembling structure comprises a shell, a supporting piece and a key module. The shell comprises a bottom plate and a frame, and the frame is provided with a mounting hole. The supporting piece is arranged on the inner side of the shell, and a mounting groove is formed in the position, opposite to the mounting hole, of the supporting piece. The key module comprises a key cap, a key circuit board and a key elastic piece, the key elastic piece is arranged on the key circuit board, the key circuit board is arranged in the mounting groove, and the key cap is limited in the mounting hole in a sliding mode and can abut against the key elastic piece. According to the key assembly structure, the mounting groove is directly formed in the position, right opposite to the mounting hole of the shell, of the supporting piece, the key circuit board is horizontally placed in the mounting groove, a black edge area only needs to cover and shield original glue, steps, safety gaps and light leakage prevention redundancy, and avoiding for a longitudinal inserting groove and a groove wall of the longitudinal inserting groove is not needed any more; therefore, the width of the black edge shrinks in equal proportion along with the canceling of the longitudinal slot.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic devices, and more particularly, to a key assembly structure, a key assembly method, and an electronic device. BACKGROUND

[0002] High screen-to-body ratio is a major selling point of electronic devices such as tablet computers, and currently various manufacturers are competing to launch narrow-bezel solutions to achieve products with high screen-to-body ratio. The side edges of the housing of a tablet computer are usually provided with keys for performing functions such as power on / off, volume adjustment, photographing, video recording, muting, and the like. Due to the current key assembly structure, the display screen of the tablet computer cannot achieve an extremely narrow-bezel effect, so that the screen-to-body ratio cannot be further improved. SUMMARY

[0003] The present application provides a key assembly structure, a key assembly method, and an electronic device. An installation slot is directly formed on a support part opposite to an installation hole of a housing, a key circuit board is placed in the installation slot, and a black border area only needs to cover and shield original glue, a step, a safety gap, and light leakage redundancy, without needing to make room for a longitudinal slot and a slot wall, so that the black border width is proportionally reduced with the cancellation of the longitudinal slot, which improves the screen-to-body ratio of the electronic device.

[0004] In a first aspect, the present application provides a key assembly structure, comprising a housing, a support part, and a key module.

[0005] The housing comprises a bottom plate and a frame provided at the edge of the bottom plate, and the frame is provided with an installation hole.

[0006] The support part is provided on the inner side of the housing, and the support part is provided with an installation slot at a part opposite to the installation hole.

[0007] The key module comprises a key cap, a key circuit board, and a key spring, the key spring is provided on the key circuit board, the key circuit board is provided in the installation slot, and the key cap is slidingly limited in the installation hole and can abut against the key spring.

[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 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.

[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; 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] In one possible design, the button circuit board is equipped with data transmission components; 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.

[0016] 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.

[0017] In one possible design, the cable tray is located on the side of the support facing the base plate.

[0018] 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.

[0019] 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; 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. 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.

[0020] 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.

[0021] 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.

[0022] In one possible design, the button circuit board, data transmission components, and adapter board are integrated into a single flexible circuit board.

[0023] The same flexible circuit board is used for the key circuit board, the data transmission part and the adapter plate, which is integrally formed, thereby eliminating the welding, conductive adhesive bonding, connector plugging and other links, the whole board body has no disconnection point, and there is no risk of solder cracking when falling, the reliability is improved, and the integrated structure can realize the effects of lightness, thinness and easy assembly.

[0024] In a possible design, the key circuit board is fixedly connected to the bottom of the mounting groove through the reinforcing sheet arranged on the side of the key circuit board opposite to the keycap.

[0025] The key circuit board is locally rigid after being attached to the reinforcing sheet on the back, and is leveled by the reinforcing sheet when being placed in the mounting groove, and is surface-bonded or heat-pressed to the bottom of the groove without additional screws. The reinforcing sheet improves the rigidity of the key area, and the key circuit board does not deform when pressed, and the keycap stroke is stable, thereby ensuring the user's pressing feeling.

[0026] In a possible design, the key circuit board and the reinforcing sheet are provided with positioning holes, and the bottom of the mounting groove is provided with positioning protrusions matched with the positioning holes.

[0027] The positioning protrusions are matched with the positioning holes of the key circuit board and the reinforcing sheet, and are automatically centered when being inserted, without additional clamps. The positioning protrusions and the positioning holes make the reinforcing sheet flatly attached to the bottom of the groove, and the key circuit board does not slip when pressed, and the keycap stroke is stable, thereby further ensuring the user's pressing feeling.

[0028] In a possible design, the bottom of the mounting groove is provided with a through hole, and the keycap is provided with a hook passing through the through hole. The key assembly structure further includes a limiting piece arranged on the side of the supporting piece opposite to the mounting groove and matched with the hook passing through the through hole to limit the keycap from being pulled out.

[0029] The hook passing through the through hole of the bottom and the limiting piece on the back are engaged, and the keycap periphery does not need to be provided with a flexible lug. Compared with the lug made of rubber or elastic material, the rigid buckling can eliminate the aging and rebound failure of the rubber or elastic material, and can ensure the limiting reliability of the keycap after long-term use.

[0030] In a possible design, the shell is provided with a display screen, and the display screen includes a cover plate and a display module arranged in layers. The projections of the display module and the hook on the second reference surface do not overlap. And / or, the projections of the display module and the limiting piece on the second reference surface do not overlap, and the second reference surface is parallel to the thickness direction of the bottom plate.

[0031] Through the above position limitation, the hook or the limiting piece can be prevented from interfering with the display module, and the display module can be ensured to be close to the frame direction, thereby ensuring the narrow black border effect on the display screen.

[0032] In a possible design, the limiting member is a sheet-shaped body, which comprises a first sheet body and a base connected to each other, the first sheet body is pressed by the hook at the via of the support member, and the base is in a curved shape and elastically abuts against the clamping groove arranged on the support member.

[0033] In a possible design, the limiting member further comprises a second sheet body connected to the first sheet body. The key assembly structure further comprises a bracket and a main plate, the bracket is fixedly connected with the support member, and the second sheet body and the main plate are clamped between the bracket and the support member.

[0034] The base of the limiting member is clamped by the clamping groove, and the bracket is fixedly connected with the support member, so that the bracket, the main plate and the support member form a clamping plate structure, and the second sheet body is clamped and fixed between the bracket and the main plate. With the double fixation, the installation reliability of the limiting member on the back side of the support member is ensured, and stable limiting of the keycap can be formed.

[0035] In a possible design, the bracket is provided with a sunken groove for accommodating the second sheet body.

[0036] The bracket is provided with the sunken groove for accommodating the second sheet body, so that the second sheet body can be sunken into the surface of the bracket, and damage to the main plate caused by the second sheet body protruding from the surface of the bracket is avoided.

[0037] In a possible design, the keycap comprises a first part and a second part, the first part is provided with a containing groove on the side facing the key circuit board for being pressed by a user, and the second part is located in the containing groove and used for abutting against the key spring.

[0038] The keycap is divided into the first part and the second part, and the first part and the second part can realize functional decoupling through material selection. The first part bears the pressing load, does not deform and does not oil, and gives the keycap a high-end texture and an impact-resistant skeleton. The second part is hidden in the containing groove, has a soft texture, and is flexibly attached to the key spring, thereby reducing the rebound noise and avoiding the corner of the hard material scratching the surface of the key spring. The first part can be selected from anodized aluminum, stainless steel, titanium alloy, ceramic and hard engineering plastic, so as to meet the needs of heat dissipation, electromagnetic shielding or decoration. The second part can be selected from silicone, rubber, thermoplastic elastomer and polyurethane, so as to use the compressibility to absorb overpressure and prolong the fatigue life of the key spring.

[0039] In a possible design, the second part is provided with a convex bump for abutting against the key spring, and the second part is further provided with a limiting boss having a height greater than that of the convex bump.

[0040] The limiting boss higher than the convex bump is designed on the second part, at the end of the keycap stroke, the limiting boss can abut against the key circuit board in advance, and the keycap is blocked from being pressed too much, which prevents the convex bump from pressing the key spring too much and causing damage, and provides a rigid stop feedback for the finger, thereby improving the pressing feeling of the user.

[0041] In a possible design, the first part is provided with a step, and the step is compressed with the elastic member between the step and the key circuit board.

[0042] The elastic member is compressed between the step and the key circuit board, and in the unpressed state, the elastic member pushes the entire key cap outward through the step. The elastic member continuously pushes the key cap outward by means of the step, and the key cap is in a stable hovering position before the finger touches it, without a loose feeling. When pressed, the elastic member is further compressed, and the stored elastic force and the key cap form double resetting with the key spring, so that the rebound of the key cap is more follow-hand. Overall, the product quality and the pressing feeling of the user of the electronic device can be improved.

[0043] In a possible design, the key circuit board is a flexible circuit board, and the side of the key circuit board opposite to the key cap is directly bonded to the groove bottom of the mounting groove.

[0044] Unlike the related art in which the key circuit board is inserted into the longitudinal slot from top to bottom, in the present application, since the mounting groove is laterally provided, the key circuit board can be laterally laid and mounted, thereby being directly bonded to the groove bottom without a reinforcing sheet, and being supported by the groove bottom. Thus, the material is saved, the tolerance of the reinforcing sheet is eliminated, the key circuit board is closer to the groove bottom, the pressing feeling is stable, and the overall thickness of the key circuit board is reduced, the processing depth of the mounting groove can be reduced, thereby ensuring the structural strength of the support member and improving the overall anti-shock effect of the electronic device.

[0045] In a second aspect, the present application also provides a key assembly method, comprising the following steps: putting the key circuit board into the mounting groove provided on the side of the support member, and fixing the key circuit board in the mounting groove; fixing the support member to the inner side of the shell; mounting the key cap in the mounting hole of the shell.

[0046] The key assembly method provided by the present application no longer provides a longitudinal slot on the support member, but directly provides a mounting groove at a position opposite to the mounting hole of the shell. The key circuit board is laterally laid in the mounting groove, and the key cap is laterally inserted into the mounting hole and abuts against the key spring. Thus, the circuit board insertion space on the support member is completely removed from the visible area of the cover plate, so that the display module can be translated towards the frame, and the black border area only needs to cover and shield the original glue, step, safety gap and light leakage redundancy, without needing to give way to the longitudinal slot and its slot wall. This shift in space position directly brings visual gain, and the black border no longer needs to shield the longitudinal slot, so the width of the black border is proportionally reduced with the cancellation of the longitudinal slot, which improves the screen-to-body ratio of the electronic device, and the user has a wider field of view, and the use experience of the front appearance of the whole machine is improved.

[0047] In a possible design, the step of fixing the support member to the inner side of the shell further comprises: The data transmission member led out on the key circuit board is placed in the wiring slot formed on the support member.

[0048] The support member is designed with a wiring slot, and the data transmission member can be embedded in the wiring slot during assembly. The slot wall provides continuous protection for the data transmission member, avoiding line breakage caused by pulling and bending during falling. The width of the wiring slot is less than the width of the key circuit board, and the key circuit board can be held by the shoulders at both ends of the slot, so that the key circuit board can be prevented from falling out of the wiring slot.

[0049] In a possible design, the step of installing the keycap in the mounting hole of the shell comprises: The hook of the keycap passes through the via hole formed in the slot bottom of the mounting slot; On the side of the support member opposite to the mounting slot, the limiting member is inserted between the hook and the support member.

[0050] The hook passes through the via hole in the slot bottom and engages with the limiting member on the back, and the keycap periphery does not need to be provided with a flexible lug. Compared with the lug made of rubber or elastomer, the rigid fastening can eliminate the risks of aging and rebound failure of rubber or elastomer, and can ensure the reliable positioning of the keycap after long-term use.

[0051] In a possible design, the step of inserting the limiting member between the hook and the support member further comprises: The main board is placed on the support member, and the second piece of the limiting member is placed on the main board; The bracket is fixed to the support member so that the bracket, the second piece, the main board and the support member are pressed in sequence.

[0052] The bracket, the main board and the support member form a clamping structure through the fixed connection of the bracket and the support member, and the second piece is clamped and fixed between the bracket and the main board. The installation reliability of the limiting member on the back side of the support member is ensured, and stable positioning of the keycap is formed.

[0053] In a possible design, the step of fixing the bracket to the support member so that the bracket, the second piece, the main board and the support member are pressed in sequence further comprises: The adapter plate led out on the key circuit board is placed in the avoiding hole formed on the support member, and the adapter plate is fixed to the bottom plate of the shell; The electrical connecting member on the main board is aligned with the adapter plate.

[0054] The second piece of the limiting piece is clamped and fixed between the main plate and the support, and the main plate and the adapter plate are electrically connected through the electrical connecting piece. The keycap limiting and the electrical connection between the key circuit board and the main plate are simultaneously completed in one step, which has the advantages of fewer processes and high assembly efficiency.

[0055] In a possible design, the step of mounting the keycap in the mounting hole of the shell further includes: The adapter plate led out of the key circuit board is placed in the avoiding hole of the support, and the adapter plate is fixed to the bottom plate of the shell; The electrical connecting piece on the main plate is aligned with the adapter plate; The support is fixed to the support to press the support, the main plate and the support in sequence.

[0056] The support and the support are fixedly connected, so that the support, the main plate, the support and the bottom plate form a clamping plate structure, the electrical connecting piece such as a conductive spring or conductive foam and the adapter plate are hidden in the avoiding hole of the support, the electrical connecting piece is compressed between the adapter plate and the main plate, and the vertical conduction of the main plate and the adapter plate is formed through the electrical connecting piece. In this way, the connector such as the BTB does not need to be plugged and unplugged, and the assembly process is convenient.

[0057] In a third aspect, the application also provides an electronic device comprising the key assembly structure in the first aspect.

[0058] The electronic device provided by the application comprises the key assembly structure in the first aspect, the support no longer has a longitudinal slot, and a mounting slot is directly formed at a position opposite to the mounting hole of the shell. The key circuit board is placed in the mounting slot from the side, and the keycap is inserted into the mounting hole from the side and abuts against the key spring. Therefore, the circuit board insertion space on the support is completely removed from the visible area of the cover plate, so that the display module can be translated towards the frame, and the black border area only needs to cover and shield the original glue, step, safety gap and light leakage redundancy, and does not need to be shifted for the longitudinal slot and the slot wall. This shift of the space position directly brings visual gain, the black border no longer needs to shield the longitudinal slot, and therefore the width of the black border is reduced by an equal proportion with the cancellation of the longitudinal slot, which improves the screen-to-body ratio of the electronic device, and the user has a wider field of view, and the use experience of the front appearance of the whole machine is improved.

[0059] In a possible design, the electronic device further comprises a display screen, and the display screen comprises a cover plate and a display module stacked.

[0060] The outer contour structure of the electronic device is specifically limited. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 is a partial view of the tablet computer in the related art; Figure 2 is Figure 1 is an exploded view of the tablet computer in the related art; Figure 3 is Figure 1 is a sectional view of the tablet computer in the related art; Figure 4 is a schematic view of the tablet computer provided by the embodiments of the present application; Figure 5 is Figure 4 is a partial view of the tablet computer in the related art; Figure 6 is Figure 5 is an exploded view of the tablet computer in the related art; Figure 7 is Figure 5 is an exploded view of the tablet computer in the related art; Figure 8 is a partial sectional view of one example of the tablet computer provided by the embodiments of the present application; Figure 9 is Figure 8 is a front view of the sectioned surface in the related art; Figure 10 is an exploded schematic view of the display screen and the support provided by the embodiments of the present application; Figure 11 is Figure 9 is a partial enlarged view in the related art; Figure 12 is an exploded schematic view of the shell, the key module and the support provided by the embodiments of the present application; Figure 13 is a partial sectional view of another example of the tablet computer provided by the embodiments of the present application; Figure 14 is a schematic view of one example of the key cap provided by the embodiments of the present application; Figure 15 is Figure 5 is an exploded view of another example of the tablet computer in the related art; Figure 16 is a schematic view of the limiting member provided by the embodiments of the present application; Figure 17 is a partial sectional view of another example of the tablet computer provided by the embodiments of the present application; Figure 18 is Figure 17 is a front view of the sectioned surface in the related art; Figure 19 is an exploded schematic view of the bracket, the limiting member and the support provided by the embodiments of the present application; Figure 20 is Figure 19 is an assembled schematic view of the bracket, the limiting member and the support in the related art; Figure 21 is Figure 20 is a schematic view of another perspective of the support, the limiting member and the support member in Figure 22 is a schematic view of another example of the keycap provided by the embodiments of the present application; Figure 23 is an exploded view of the keycap in Figure 22 Figure 24 is a partial sectional view of another example of the tablet computer provided by the embodiments of the present application; Figure 25 is a flowchart of an example of the key assembling method provided by the embodiments of the present application; Figure 26 is a flowchart of another example of the key assembling method provided by the embodiments of the present application.

[0062] Reference signs: 10', housing; 11', frame; 111', mounting hole; 12', bottom plate; 20', support member; 201', longitudinal 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; 10, housing; 11, frame; 111, mounting hole; 12, bottom plate; 20, support member; 21, mounting slot; 211, positioning protrusion; 22, wiring slot; 23, avoiding hole; 24, via hole; 25, clamping slot; 26, glue dispensing area; 261, first area; 262, second area; 30, key module; 31, keycap; 311, first part; 312, second part; 313, hook; 314, convex bump; 315, limiting boss; 316, accommodating slot; 317, step; 318, elastic member; 319, hanging ear; 32, key circuit board; 321, reinforcing sheet; 322, positioning hole; 323, data transmission member; 324, adapter plate; 33, key spring; 40, limiting member; 41, first sheet body; 42, second sheet body; 43, base; 50, main board; 51, electrical connecting member; 60, support; 61, sink; 70, display screen; 71, cover plate; 72, display module. DETAILED DESCRIPTION

[0063] The related content that the embodiments of the present application can involve is described below. Apparently, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0064] ​In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In the description of the present application, it is necessary to understand that the terms "upper", "lower", "side", "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship based on the installation, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the present application.

[0066] It should be further pointed out that the same reference signs in the embodiments of the present application represent the same component or the same part, and for the same parts in the embodiments of the present application, only one part or component may be labeled with a reference sign in the drawing, and it should be understood that the reference sign is also applicable to other identical parts or components.

[0067] In the description of the present application, it is necessary to point out that the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone.

[0068] High screen ratio is a big selling point of electronic devices such as tablet computers, and currently various manufacturers are competing to launch narrow black border solutions to achieve high screen ratio products. The side of the shell of the tablet computer is usually provided with a key for performing functions such as turning on and off, volume adjustment, photographing, video recording, muting, etc. Due to the limitation of the current key assembly structure, the display screen of the tablet computer cannot achieve the effect of extremely narrow black border, so that the screen ratio cannot be further improved.

[0069] The design defects of the current key assembly structure will be described in detail below with reference to the accompanying drawings.

[0070] Figure 1 is a partial view of a tablet computer in the related art. Figure 2 is Figure 1 is an exploded view of the tablet computer in

[0071] As Figures 1-2As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'.

[0072] As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'. Figure 2 As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'.

[0073] Figure 3 As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'. Figure 1 As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'. Figure 3 As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'. Figure 3 As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'.

[0074] As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'. Figure 3 As shown in the related art tablet computer, the key assembly structure mainly comprises a shell 10', a support 20' and a key module 30'. The shell 10' comprises a bottom plate 12' and a frame 11' arranged at the edge of the bottom plate 12', and the frame 11' is provided with a mounting hole 111'. The support 20' is arranged at the inner side of the shell 10', and the surface of the support 20' facing the display screen 70' is provided with a longitudinal slot 201'. The part of the support 20' opposite to the mounting hole 111' is provided with a through hole 202' communicating with the longitudinal slot 201'. The key module 30' comprises a key cap 31', a key circuit board 32' and a key spring 33', and the key spring 33' is arranged on the key circuit board 32'.

[0075] In order to ensure the bonding strength of the cover plate 71' and the support 20' and the waterproof sealing effect of the tablet computer, the dispensing width d1 and the step width d2 cannot be further reduced. In order to ensure the drop reliability of the display screen 70' and the user's visual experience, the safety gap width d5 and the redundant width d6 also cannot be further reduced. Therefore, if it is desired to reduce the width of the opaque area on the cover plate 71' and improve the screen-to-body ratio of the tablet computer, the design of the key assembly structure must be improved.

[0076] In the related art, the width d3 of the longitudinal slot 201' and the width d4 of the slot wall for enclosing the longitudinal slot 201' occupy most of the width dimension of the opaque area, which limits the extremely narrow black border effect of the display screen and makes it impossible to further improve the screen-to-body ratio.

[0077] Therefore, in order to solve the technical problem of the excessively wide black border of the display screen 70' caused by the key assembly structure in the related art, the present application provides a key assembly structure, a key assembly method and an electronic device. An installation slot is directly formed on the support at a position opposite to the mounting hole of the shell, and the key circuit board is placed in the installation slot. The black border area only needs to cover and shield the original glue, step, safety gap and light leakage prevention redundancy, and does not need to make room for the longitudinal slot and its slot wall. Therefore, the black border width is proportionally reduced with the cancellation of the longitudinal slot, which improves the screen-to-body ratio of the electronic device.

[0078] The electronic device provided in the embodiments of the present application can also be referred to as a mobile device, a terminal device, a mobile terminal or a terminal. The electronic device includes but is not limited to a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem. For example, the electronic device can include a smart watch, a smart bracelet, a mobile phone, a personal digital assistant computer, a tablet computer, a notebook computer, a vehicle-mounted computer, smart glasses, a game console and other electronic devices with a key assembly structure and requiring a narrow black border design of a display screen.

[0079] In order to more conveniently describe the electronic device provided in the embodiments of the present application, by way of example but not limitation, the technical solutions of the present application will be described in detail below with the electronic device being a tablet computer. Meanwhile, in order to facilitate the description of each embodiment 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 direction, the Y direction and the Z direction are perpendicular to each other.

[0080] Figure 4 is a schematic diagram of the tablet computer provided in the embodiments of the present application.

[0081] AsFigure 4 As shown, the tablet computer provided by the embodiment of the present application comprises a display screen 70, a shell 10 and a key module 30. The overall shape of the shell 10 (corresponding to the shape of the display screen 70) can be rectangular, square, track-shaped or oval, etc. The shell 10 provides mechanical support and protection for the whole tablet computer, and the shell 10 is made of a material with sufficient hardness, which can be stainless steel, ceramic, titanium alloy, aluminum alloy, copper alloy or hard plastic, etc.

[0082] One side of the shell 10 is open, and the other side is closed. The display screen 70 is covered on the open side of the shell 10, and the display screen 70 and the shell 10 jointly define a containing space of the tablet computer, which is used to install various functional elements of the tablet computer, such as the motherboard 50, the bracket 60, the electrical connector 51 and other functional elements which will be mentioned later.

[0083] The display screen 70 can be a liquid crystal display (LCD), which is provided with a thin film transistor (TFT) inside. Since the thin film transistor itself does not emit light, the liquid crystal display needs to provide backlight through a side-in light source. In addition to the thin film transistor and the light source, the liquid crystal display also includes a frame, a light guide plate (LGP), a display driver integrated circuit (DDIC), etc. Among them, the light guide plate is used to scatter the light emitted by the light source, so that the point light emitted by the light source can be uniformly irradiated to the thin film transistor as planar light. The light guide plate, the light source and other components are located inside the frame, and the frame supports and protects the light guide plate and the light source. The main function of the display driver integrated circuit is to send driving signals and data to the thin film transistor in the form of electrical signals, so that image information such as letters, pictures, etc. can be presented on the liquid crystal display.

[0084] The display screen 70 can also be an organic electroluminescence display (OLED). The organic electroluminescence display includes an optically clear adhesive (OCA), a polarizer (POL), a flexible substrate, a buffer film (BF), a shielding cushion foam (SCF) and the like which are sequentially stacked.

[0085] The display screen 70 in the present application can also be other types of display screens, which are not limited in the present application.

[0086] In addition, the tablet computer can further include a processor, a universal serial bus (USB) interface, a battery, a camera module, a charging management module, a power management module, a mobile communication module, an antenna, a wireless communication module, an audio module, an earphone interface, a sensor module, and a subscriber identification module (SIM) card interface.

[0087] The functional elements can be changed according to user needs. It can be understood that the specific embodiments described above are merely a specific implementation of the present application, and other ways of implementing the present application are also within the scope of the present application, which will not be described here.

[0088] The technical solution of the key assembly structure of the tablet computer in the embodiments of the present application will be described in detail below.

[0089] Figure 5 is a partial view of the tablet computer in Figure 4 . Figure 6 is an exploded view of the tablet computer in Figure 5 . Figure 7 is another perspective view of the exploded view of the tablet computer in Figure 5 .

[0090] As shown in Figures 5-7 , the key assembly structure provided by the embodiments of the present application includes a shell 10, a support 20, and a key module 30.

[0091] The shell 10 includes a bottom plate 12 and a frame 11, and the frame 11 is arranged around the edge of the bottom plate 12. Optionally, the frame 11 can be fixed to the edge of the bottom plate 12 by adhesion, welding, or the like, or the frame 11 and the bottom plate 12 can also be integrally formed by casting or die casting. The frame 11 is provided with a mounting hole 111, and optionally, the shape of the mounting hole 111 can be rectangular, square, track-shaped, or elliptical, etc.

[0092] The support 20 is arranged on the inner side of the shell 10, and a mounting groove 21 is arranged at the position of the support 20 opposite to the mounting hole 111. The support 20 serves as an internal skeleton of the tablet computer, and is used for providing a mounting and fixing basis for functional elements such as a mainboard 50, a support 60, a processor, a battery, a camera module, an antenna and the like of the tablet computer. Optionally, the material of the support 20 can be hard plastic such as polycarbonate, or can also be metal material such as aluminum alloy. Optionally, the support 20 can be fixedly connected to the inner side of the shell 10 in a mode of adhesion, welding, clamping, fastener locking or the like. Optionally, the shape structure of the support 20 can be similar to that of the shell 10, and also has the features of the frame and the bottom plate, or the support 20 can also have a frame structure.

[0093] The key module 30 comprises a key cap 31, a key circuit board 32 and a key spring 33. The key spring 33 is arranged on the key circuit board 32, the key circuit board 32 is arranged in the mounting groove 21, and the key cap 31 is slidingly limited in the mounting hole 111 and can abut against the key spring 33.

[0094] The key cap 31 is slidingly limited in the mounting hole 111, which means that the key cap 31 can reciprocate along the hole axis (X direction in the figure) relative to the mounting hole 111, and the key cap 31 cannot be separated from the mounting hole 111 by the limiting structure such as the hanging ear 319 or the hook 313. The specific design scheme of the key cap 31 will be described in detail in the following embodiments. Figure 9

[0095] The key spring 33 can also be called a pot spring. Optionally, the key spring 33 can be made of ultra-thin 301 or 304 stainless steel material. The key spring 33 is arranged at the conductive position on the key circuit board 32. When the key cap 31 is pressed, the key cap 31 drives the center point of the key spring 33 to be concave, contacts the circuit on the key circuit board 32, and makes the circuit of the key circuit board 32 conductive, so that the tablet computer executes functions such as power on / off, volume adjustment, photographing, video shooting and muting. When the user releases the key cap 31, the key spring 33 is elastically reset, the center point is convex to restore to the original position, and the key cap 31 is also pushed out.

[0096] Figure 8 is a partial cross-sectional view of an example of the tablet computer provided by the embodiments of the present application. Figure 9 is a front view of the cross-sectional surface in Figure 8 .

[0097] As shown in Figures 8-9 , the key assembly structure in the embodiments of the present application arranges the mounting groove 21 at the position of the support 20 opposite to the mounting hole 111, and arranges the key circuit board 32 in the mounting groove 21. After the key cap 31 is inserted into the mounting hole 111, the key cap 31 directly abuts against the key spring 33. Compared with the prior art, the key assembly structure in the embodiments of the present application has the advantages that the key cap 31 is directly abutted against the key spring 33, the key spring 33 is directly abutted against the key circuit board 32, and the key cap 31 is directly abutted against the key circuit board 32, so that the key assembly structure is compact, the key assembly structure is small in size, the key assembly structure is light in weight, the key assembly structure is convenient to use, and the key assembly structure is convenient to manufacture.​Figure 3 After comparing the key assembly structure in the related art, it can be seen that in the key assembly structure in the embodiment of the present application, since the longitudinal slot 201' and the slot wall for enclosing the longitudinal slot 201' do not need to be designed, the display module 72 can be close to the edge of the cover plate 71, and the opaque area on the cover plate 71 does not need to consider shielding the longitudinal slot 201' and the slot wall for enclosing the longitudinal slot 201', so that when the opaque area of the cover plate 71 is formed, the width d3 of the longitudinal slot 201' and the width d4 of the slot wall for enclosing the longitudinal slot 201' can be omitted, so that the opaque area on the cover plate 71 is narrowed, and the black edge width seen by the user is reduced, and the screen-to-body ratio of the tablet computer is improved.

[0098] In summary, in the key assembly structure in the embodiment of the present application, the longitudinal slot 201' is no longer arranged on the support 20, but a mounting slot 21 is directly arranged at a position opposite to the mounting hole 111 of the shell 10. The key circuit board 32 is placed in the mounting slot 21 from the side, and the key cap 31 is inserted into the mounting hole 111 from the side and abuts against the key spring 33. Thus, the circuit board insertion space on the support 20 is completely removed from the visible area of the cover plate 71, so that the display module 72 can be translated towards the frame 11, and the black edge area only needs to cover and shield the original glue, step, safety gap and light leakage redundancy, and does not need to be further provided with a position for the longitudinal slot 201' and the slot wall. The space position transfer directly brings visual gain, the black edge no longer needs to shield the longitudinal slot 201', and thus the black edge width is reduced by an equal proportion with the cancellation of the longitudinal slot 201', which improves the screen-to-body ratio of the tablet computer, the user has a wider field of view, and the use experience of the front appearance of the whole machine is improved.

[0099] In addition, the key cap 31 directly extends into the mounting slot 21 through the mounting hole 111 and abuts against the key spring 33, and the transition section in the through hole 202' in the related art is omitted for the key cap 31, so that the thickness (X direction size) of the key cap 31 is greatly reduced, and the thickness reduction of the key cap 31 shortens the distance between the force point of the finger and the bearing point of the key spring 33, that is, the torque is reduced, the key cap 31 is not easy to be deflected, the key cap 31 moves stably when being pressed, and the rebound is more rapid, so that the pressing feeling of the user is improved. Figure 9

[0100] Figure 10 FIG. 4 is an exploded view of the display screen 70 and the support 20 according to the embodiment of the present application. Figure 11 FIG. 5 is a partial enlarged view of FIG. 4. Figure 9 FIG. 6 is a partial enlarged view of FIG. 4.

[0101] FIG. 7 is a partial enlarged view of FIG. 4. Figure 10 FIG. 8 is a partial enlarged view of FIG. 4. Figure 11 ​As 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] Optionally, the button circuit board 32 can be a flexible printed circuit (FPC) or a printed circuit board (PCB).

[0113] Alternatively, the data transmission component 323 may be a flexible flat cable (FFC) or a flexible circuit board.

[0114] 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.

[0115] Optionally, the main board 50 can be a printed circuit board. The material of the main board 50 can be a Direct Bond Ceramic (DBC), an Active Metal Brazing (AMB), a Direct Bond Aluminum (DBA), or the like.

[0116] Continuing as shown in FIG. 3B, in an embodiment provided by the present application, the wiring groove 22 is arranged on the side of the support 20 facing the bottom plate 12. Figure 12

[0117] In the embodiment, the wiring groove 22 is arranged on the side of the support 20 facing the bottom plate 12, and the data transmission member 323 is clamped between the support 20 and the bottom plate 12. The groove wall and the bottom plate 12 jointly form a closed channel. When falling, the data transmission member 323 is not directly impacted by other protruding parts, thereby ensuring the reliability of the data transmission member 323, and further ensuring the stability of the electrical connection between the key circuit board 32 and the main board 50.

[0118] In addition to the electrical connection between the data transmission member 323 and the main board 50 through the above-mentioned several connectors, the electrical connection between the data transmission member 323 and the main board 50 can also be achieved through the electrical connecting member 51. The specific design scheme is as follows.

[0119] Figure 13 FIG. 4 is a partial cross-sectional view of another example of the tablet computer provided by the embodiment of the present application.

[0120] As shown in FIG. 4, and in combination with FIG. 3B, Figure 13 Figure 12 In an embodiment provided by the present application, as shown in FIG. 4, an adapter plate 324 is arranged at the end of the data transmission member 323 away from the key circuit board 32. The support 20 is provided with an avoiding hole 23, the avoiding hole 23 is in communication with the wiring groove 22, and the adapter plate 324 is located in the avoiding hole 23 and fixedly connected with the bottom plate 12. The key assembly structure further comprises a bracket 60 and a main board 50. The bracket 60 is fixedly connected with the support 20 and clamps the main board 50 between the bracket 60 and the support 20. The main board 50 is provided with an electrical connecting member 51 such as a conductive spring or conductive foam. The electrical connecting member 51 is located in the avoiding hole 23 and elastically abuts against the adapter plate 324.

[0121] In the embodiment, the fixed connection of the bracket 60 and the support 20 causes the bracket 60, the main board 50, the support 20, and the bottom plate 12 to form a clamping plate structure. The electrical connecting member 51 such as a conductive spring or conductive foam and the adapter plate 324 are hidden in the avoiding hole 23 of the support 20. The electrical connecting member 51 is compressed between the adapter plate 324 and the main board 50, thereby forming vertical conduction between the main board 50 and the adapter plate 324 through the electrical connecting member 51. In this way, the connector such as the BTB does not need to be plugged and unplugged, and the assembly process is convenient.​​

[0122] 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.

[0123] Alternatively, the adapter board 324 can be a flexible circuit board or a printed circuit board.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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 engaged with the positioning holes 322.

[0129] 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.

[0130] Continue as Figure 12As shown, in an embodiment provided by the present application, the side of the adapter plate 324 opposite to the main plate 50 is provided with a reinforcing sheet 321, and the adapter plate 324 is fixedly connected to the bottom plate 12 through the reinforcing sheet 321.

[0131] In this embodiment, the reinforcing sheet 321 is additionally arranged on the back of the adapter plate 324 and is bonded to the bottom plate 12 to form a rigid support, thereby preventing the adapter plate 324 from warping when the conductive spring or the conductive foam is pressed. The reinforcing sheet 321 can disperse the pressure and avoid local bending of the adapter plate 324, thereby ensuring that the conductive spring or the conductive foam continuously and stably contacts the main plate 50 and improving the electrical connection reliability.

[0132] As shown in FIG. 4, the adapter plate 324 is inserted into the avoiding hole 23. Figure 12 As shown, in an embodiment provided by the present application, the adapter plate 324 and the reinforcing sheet 321 are provided with positioning holes 322, and the hole wall of the avoiding hole 23 is provided with positioning protrusions 211 which are in a socket-and-spigot fit with the positioning holes 322.

[0133] In this embodiment, the positioning protrusions 211 are in a socket-and-spigot fit with the positioning holes 322, and the adapter plate 324 is automatically centered when being placed into the avoiding hole 23, thereby ensuring that the conductive spring or the conductive foam is precisely aligned with the pads of the adapter plate 324 without the need of an additional clamp. The positioning is achieved by insertion, thereby eliminating the lateral deviation, ensuring the consistency of the contact resistance, avoiding the conduction failure caused by pressure deviation, preventing the adapter plate 324 from sliding and impacting the data transmission member 323 when falling, and improving the electrical connection reliability and the assembly efficiency.

[0134] In another embodiment provided by the present application, the key circuit board 32 is a flexible circuit board, and the side of the key circuit board 32 opposite to the key cap 31 is directly bonded to the groove bottom of the mounting groove 21.

[0135] Unlike the related art in which the key circuit board 32 is inserted into the longitudinal slot 201' from top to bottom, in this embodiment, since the mounting groove 21 is laterally arranged, the key circuit board 32 can be laterally placed and mounted, thereby being directly bonded to the groove bottom without the need of the reinforcing sheet 321 and being supported by the groove bottom. In this way, the material is saved, the tolerance of the reinforcing sheet 321 is eliminated, the key circuit board 32 is closer to the groove bottom, the pressing feeling is stable, the overall thickness of the key circuit board 32 is reduced, the processing depth of the mounting groove 21 can be reduced, thereby ensuring the structural strength of the support member 20 and improving the overall anti-shock effect of the tablet computer.

[0136] Figure 14 FIG. 4 is a schematic view of an example of the key cap 31 provided by an embodiment of the present application.

[0137] As shown in FIG. 4, the adapter plate 324 is inserted into the avoiding hole 23. 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.

[0138] Optionally, the resin material includes, but is not limited to, polyvinyl chloride, polypropylene, polyethylene terephthalate, ethylene-vinyl acetate copolymer, polybutylene terephthalate, polycarbonate, polyoxymethylene, etc.

[0139] 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.

[0140] Optionally, the elastomer material includes, but is not limited to, styrene-based elastomers, polyurethane elastomers, polyolefin elastomers, polyester elastomers, etc.

[0141] 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.

[0142] Figure 15 yes Figure 5 An exploded view of another example of a tablet computer.

[0143] 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.

[0144] 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.

[0145] Figure 16 This is a schematic diagram of the limiting member 40 provided in the embodiments of this application.

[0146] like Figure 16As shown in an embodiment provided in the present application, the limiting member 40 is a sheet-shaped body, which includes a first sheet body 41, a second sheet body 42 connected to the first sheet body 41, and a base 43.

[0147] Optionally, the limiting member 40 can be made of 301 or 304 stainless steel material.

[0148] Optionally, the limiting member 40 can also have other structures, such as a latch, a limiting arm, etc., as long as it can limit the hook 313 on the back side of the support member 20.

[0149] Figure 17 FIG. 6 is a partial cross-sectional view of another example of the tablet computer provided in an embodiment of the present application. Figure 18 FIG. 7 is a front view of the cross-sectional surface in FIG. 6. Figure 17 As shown in FIG. 7, the hook 313 and the limiting member 40 do not overlap on the second reference surface.

[0150] Figures 17-18 As shown in an embodiment provided in the present application, the housing 10 is provided with a display screen 70, which includes a cover plate 71 and a display module 72 arranged in layers. The projection of the display module 72 and the hook 313 on the second reference surface does not overlap. And / or, the projection of the display module 72 and the limiting member 40 on the second reference surface does not overlap, and the second reference surface is parallel to the thickness direction of the bottom plate 12.

[0151] In the present application, the second reference surface can be understood as the YZ plane in FIG. 7, the display module 72 and the hook 313 are projected along the X direction to the YZ plane, and the projection of the display module 72 and the hook 313 does not overlap. In addition, the display module 72 and the limiting member 40 are projected along the X direction to the YZ plane, and the projection of the display module 72 and the limiting member 40 does not overlap. Figure 18 In the present embodiment, through the above position limitation, it can be avoided that the hook 313 or the limiting member 40 interferes with the display module 72, and it is ensured that the display module 72 can be close to the frame 11 direction, thereby ensuring the narrow black border effect on the display screen 70.

[0152] In addition, it can also avoid that the hook 313 or the limiting member 40 hits the edge of the display module 72 when falling, eliminate the risk of bright lines and display failure, and achieve higher safety while achieving narrower black border.

[0153]

[0154] FIG. 8 is an exploded schematic view of the support 60, the limiting member 40, and the support member 20 provided in an embodiment of the present application. Figure 19 FIG. 9 is an assembly schematic view of the support 60, the limiting member 40, and the support member 20 in FIG. 8. Figure 20 Figure 19 As shown in FIG. 9, the support 60, the limiting member 40, and the support member 20 are assembled together.

[0155] As shown in FIG. 9, the support 60, the limiting member 40, and the support member 20 are assembled together. Figures 19-20 ​​As 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] Figure 21 yes Figure 20 A schematic diagram of the bracket 60, the limiting member 40, and the support member 20 from another perspective.

[0161] 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.

[0162] 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.

[0163] Figure 22is a schematic view of another example of the keycap 31 provided in an embodiment of the present application. Figure 23 is Figure 22 is an exploded view of the keycap 31 in

[0164] As shown in Figures 22-23 In an embodiment provided in the present application, the keycap 31 includes a first part 311 and a second part 312. The first part 311 is for a user to press and is provided with a receiving groove 316 on one 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.

[0165] In the present embodiment, the keycap 31 is divided into the first part 311 and the second part 312. The first part 311 and the second part 312 can realize functional decoupling through material selection. The first part 311 bears the pressing load and does not deform or oil, giving the keycap 31 a high-end texture and impact-resistant skeleton. The second part 312 is hidden in the receiving groove 316 and is soft, which is flexibly attached to the key spring 33, thereby reducing the rebound noise and avoiding the corner of the hard material scratching the surface of the key spring 33. The first part 311 can be selected from anodized aluminum, stainless steel, titanium alloy, ceramic, hard engineering plastic, etc., taking into account the needs of heat dissipation, electromagnetic shielding or decoration. The second part 312 can be selected from silicone, rubber, thermoplastic elastomer, polyurethane, etc., which can absorb overpressure by compressibility and prolong the fatigue life of the key spring 33.

[0166] The above-mentioned oiling refers to the surface of the keycap 31 being polished and slippery, and having an oily feeling. The reason is that after the plastic keycap 31 is rubbed by fingers for a long time, the surface micro-texture is polished, and the sebum penetrates to form a reflective oil film, which is not only ugly but also slippery. Oiling means that the material is not easy to polish a bright oil film. Metals, ceramics, etc. have high hardness or are not oil-wet, and long-term pressing still maintains the original matte texture and dry touch.

[0167] Optionally, the number of receiving grooves 316 can be one or more.

[0168] Continuing as shown in Figures 22-23 In an embodiment provided in the present application, the second part 312 is provided with a convex 314 for abutting against the key spring 33. The second part 312 is also provided with a limiting boss 315 having a height greater than the convex 314.

[0169] In the present embodiment, by designing the limiting boss 315 higher than the convex 314 on the second part 312, at the end of the stroke of the keycap 31, the limiting boss 315 can abut against the key circuit board 32 in advance, blocking the keycap 31 from being pressed too much, preventing the convex 314 from pressing the key spring 33 too much and causing damage, and providing a rigid stop feedback for the finger, improving the user's pressing feeling.

[0170] Figure 24is a partial cross-sectional view of another example of the tablet computer provided in an embodiment of the present application.

[0171] As shown in Figure 24 , and in combination with Figure 23 , in an embodiment provided in the present application, the first portion 311 is provided with a step 317, and a compression elastic member 318 is arranged between the step 317 and the key circuit board 32.

[0172] In the present embodiment, the elastic member 318 is compressed between the step 317 and the key circuit board 32, and in the non-pressed state, the elastic member 318 pushes the entire key cap 31 outward through the step 317. The elastic member 318 continuously pushes the key cap 31 outward by means of the step 317, and before the finger touches the key cap 31, the key cap 31 is in a stable hovering position, and there is no loose feeling. When pressed, the elastic member 318 is further compressed, and the stored elastic force and the key cap 31 form double resetting by the key spring 33, so that the rebound of the key cap 31 is more in line with the hand. Overall, the product quality and the pressing feeling of the user of the tablet computer can be improved.

[0173] Optionally, the elastic member 318 can be foam, spring, rubber block, etc.

[0174] Optionally, the number of accommodation grooves 316 is two, and the step 317 is arranged between the two accommodation grooves 316.

[0175] Figure 25 is a flowchart of an example of a key assembly method provided in an embodiment of the present application. Among them, Figure 25 (a) in is an exploded view of the support member 20 and the key circuit board 32; Figure 25 (b) in is an assembly view of the support member 20 and the key circuit board 32; Figure 25 (c) in is an exploded view of the shell 10 and the support member 20; Figure 25 (d) in is an exploded view of the shell 10 and the key cap 31; Figure 25 (e) in is an exploded view of the bracket 60, the mainboard 50, and the support member 20; Figure 25 (f) in is an assembly view of the bracket 60, the mainboard 50, and the support member 20.

[0176] As shown in Figure 25 , the present application further provides a key assembly method, which comprises the following steps.

[0177] Step 101, as shown in Figure 25 (a) and (b), the key circuit board 32 is placed in the mounting groove 21 of the support member 20 from the side of the support member 20, and the key circuit board 32 is fixed in the mounting groove 21.

[0178] Optionally, the button circuit board 32 can be fixed to the bottom of the mounting groove 21 by adhesive.

[0179] 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.

[0180] Step 103, as follows Figure 25 As shown in (c), the support member 20 is fixed to the inside of the housing 10.

[0181] Optionally, the support member 20 can be fixed to the inside of the housing 10 by adhesive.

[0182] Step 104, as follows Figure 25 As shown in (d), the keycap 31 is installed in the mounting hole 111 of the housing 10.

[0183] 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.

[0184] 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.

[0185] Step 106, as follows Figure 25 As shown in (e), align the electrical connector 51 on the motherboard 50 with the adapter board 324.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] like Figure 26 As shown, in one embodiment provided in this application, the button assembly method includes the following steps.

[0190] 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.

[0191] Optionally, the button circuit board 32 can be fixed to the bottom of the mounting groove 21 by adhesive.

[0192] 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.

[0193] Step 203, as follows Figure 26 As shown in (c), the support member 20 is fixed to the inside of the housing 10.

[0194] Optionally, the support member 20 can be fixed to the inside of the housing 10 by adhesive.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] Optionally, the limiting member 40 further comprises a base 43 in a curved shape, which is elastically abutted in the clamping groove 25 provided on the support member 20 when the second sheet 42 of the limiting member 40 is placed on the main plate 50.

[0199] Step 207, as shown in (e) of FIG. 6, the adapter plate 324 led out of the key circuit board 32 is placed in the avoiding hole 23 opened on the support member 20, and the adapter plate 324 is fixed to the bottom plate 12 of the shell 10. Figure 26

[0200] Step 208, as shown in (e) of FIG. 6, the electric connecting member 51 on the main plate 50 is aligned with the adapter plate 324. Figure 26

[0201] Step 209, as shown in (f) of FIG. 6, the bracket 60 is fixed to the support member 20 so that the bracket 60, the second sheet 42, the main plate 50 and the support member 20 are pressed in turn. Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure 26 Figure

[0202] In step 209, the bracket 60 is fixed to the support member 20 so that the bracket 60, the second sheet 42, the main plate 50 and the support member 20 are pressed in turn, not only the second sheet 42 of the limiting member 40 is clamped and fixed between the main plate 50 and the bracket 60, but also the main plate 50 and the adapter plate 324 are electrically connected through the electric connecting member 51. One step synchronously completes the limiting of the key cap 31 and the electrical connection between the key circuit board 32 and the main plate 50. It has the advantages of less process and high assembly efficiency.

[0203] Optionally, when the bracket 60 is fixed to the support member 20, the design scheme can be adopted that the main plate 50 is opened with an avoiding gap, the support member 20 is provided with a threaded hole column, the threaded hole column is abutted with the bracket 60 after passing through the avoiding gap, and then a screw is screwed in the threaded hole column to lock the bracket 60 and the support member 20.

[0204] In an embodiment provided in the application, the key assembling method comprises the following steps.

[0205] Step 301, the key circuit board 32 is placed in the mounting groove 21 opened on the side of the support member 20, and the key circuit board 32 is fixed in the mounting groove 21.

[0206] Step 302, the data transmission member 323 led out of the key circuit board 32 is passed out of the wiring hole opened on the support member 20.

[0207] Step 303, the support member 20 is fixed to the inner side of the shell 10.

[0208] Step 304, the key cap 31 is installed in the mounting hole 111 of the shell 10. ​​​

[0209] Step 305, the connector on the data transmission member 323 is buckled with the connector on the mainboard 50.

[0210] Optionally, the connector on the data transmission member 323 can be a BTB plug, and the connector on the mainboard 50 can be a BTB socket.

[0211] Finally, it should be noted that the above description is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection 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 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), and the key circuit board (32) 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).

2. The button assembly structure according to claim 1, characterized in that, The support member (20) is provided with an adhesive 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).

3. The button assembly structure according to claim 2, characterized in that, 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.

4. The button assembly structure according to any one of claims 1-3, 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).

5. The button assembly structure according to claim 4, characterized in that, The wiring channel (22) is located on the side of the support member (20) facing the base plate (12).

6. The button assembly structure according to claim 5, 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).

7. The button assembly structure according to claim 6, characterized in that, The button circuit board (32), the data transmission component (323), and the adapter board (324) are integrally formed flexible circuit boards.

8. The button assembly structure according to any one of claims 1-3 and 5-7, 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).

9. The button assembly structure according to claim 8, 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).

10. The button assembly structure according to any one of claims 1-3, 5-7, and 9, 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.

11. The button assembly structure according to claim 10, 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).

12. The button assembly structure according to claim 10, 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).

13. The button assembly structure according to claim 12, 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).

14. The button assembly structure according to claim 13, characterized in that, The support (60) has a groove (61) for accommodating the second piece (42).

15. The button assembly structure according to any one of claims 1-3, 5-7, 9, and 11-14, 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).

16. The button assembly structure according to claim 15, 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).

17. The button assembly structure according to claim 15, 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).

18. The button assembly structure according to any one of claims 1-3, 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).

19. A button assembly method, characterized in that, include: The 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).

20. The button assembly method according to claim 19, 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).

21. The button assembly method according to claim 19, 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).

22. The button assembly method according to claim 21, 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.

23. The button assembly method according to claim 22, 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).

24. The button assembly method according to claim 19, 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.

25. An electronic device, characterized in that, Includes the button assembly structure as described in any one of claims 1-18.

26. The electronic device according to claim 25, 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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