Ultra-thin balanced key

Abstract

The application discloses an ultrathin balanced key for triggering an electronic element arranged on a PCB to generate a signal, which comprises a key cap, a bottom plate and a linkage component arranged between the key cap and the bottom plate, the linkage component comprises linkage wings and trigger wings which are pivotally connected with each other, the linkage wings and the trigger wings are provided with pivot arms on two sides thereof, the end of the linkage wing pivot arm and the end of the trigger wing pivot arm are pivotally connected with each other, and a limiting structure is arranged on each pivot arm; a support component for limiting the linkage component is further arranged on the bottom plate; and a tilting support point abutting on the bottom plate is formed on the side of the position adjacent to the end of each pivot arm and facing the bottom plate. The trigger wings and the linkage wings are pivotally connected with each other, the limiting cover plate and other structures are reduced, the up and down moving stroke is further reduced under the premise of ensuring the balance stability of pressing, the positioning and cooperation between the linkage components are stable, and the key structure can be more material-saving and lighter and thinner.

Description

Technical Field

[0001] This invention relates to switching devices, and more specifically to an ultra-thin balanced button. Background Technology

[0002] Input devices are devices that allow data and information to be input into a computer. They serve as a bridge for communication between the computer and the user or other devices, such as a keyboard. A keyboard is composed of several key switches.

[0003] As electronic devices become increasingly miniaturized, the demand for thinner and lighter keyboards also increases. Take laptops as an example: modern laptops weigh only about 1kg, are only about 13mm thick, and have a key travel of only about 1.5mm. To meet the requirements of thin and light design in electronic devices, one of the biggest obstacles affecting thickness is the keyboard thickness. The core issue affecting keyboard thickness is the height (thickness) of the key switches. How to make key switches ultra-thin without affecting the balance and stability when pressed, ensuring that the user can accurately and stably generate a switching signal when pressing different positions of the keycap, is a technical challenge in this field. In existing technologies, to achieve balanced and stable pressing of ultra-thin key switches, scissor-switch switches with a short key travel are generally used. However, the inherent mechanism of scissor-switch switches limits further thinning.

[0004] Furthermore, in existing technologies, to achieve longer lifespans and dust and water resistance, photoelectric switches are widely used to replace traditional metal contacts and other physical contacts. A photoelectric switch is a type of switch that uses a grating to change the amount of light received by the light-emitting element from the light-receiving element, thereby generating a switching signal.

[0005] Patent No. 202111067452.8, entitled "An Ultra-thin Balanced Pressing Photoelectric Button Structure", discloses a button structure that can effectively reduce the pressing distance. However, the structure uses a limiting cover plate to fix the torsion spring, which increases the production cost accordingly and is still not simple enough. In response to this problem, this application proposes a new button structure. Summary of the Invention

[0006] To address the aforementioned problems, this invention aims to provide an ultra-thin balance button that saves materials and provides stable pressing.

[0007] To achieve this technical objective, the present invention provides an ultra-thin balanced key for triggering signals from electronic components mounted on a PCB board, comprising a keycap, a base plate, and a linkage component disposed between the keycap and the base plate.

[0008] The linkage component includes a linkage wing and a trigger wing that are pivotally connected to each other. Both sides of the linkage wing and the trigger wing have pivot arms extending from them. The ends of the pivot arms of the linkage wing and the trigger wing are pivotally connected to each other. Each pivot arm is provided with a limiting structure. The base plate is also provided with a bracket component that cooperates with the limiting structure to limit the linkage component.

[0009] Each pivot arm has a wobbling fulcrum that abuts against the base plate on the side near its end.

[0010] The linkage component also includes a reset spring, one end of which is connected to the linkage wing and the other end is connected to the trigger wing;

[0011] The keycap is fastened to the upper part of the linkage wing and the trigger wing, and the trigger wing is equipped with a trigger structure for triggering electronic components to generate signals.

[0012] Preferably, one of the pivot arms of the linkage wing has a central positioning post on the outer side of its end and a pivot shaft on its inner side, while the other pivot arm of the linkage wing has only a pivot hole at its end; one of the pivot arms of the trigger wing has a central positioning post on the outer side of its end and a pivot shaft on its inner side, while the other pivot arm of the trigger wing has only a pivot hole at its end; the linkage wing and the trigger wing are connected to each other via their respective pivot shafts and pivot holes to form a pivotal relationship; the support member is provided with a central positioning groove relative to the central positioning post of the linkage wing and the trigger wing to limit the central positioning post in the left, right and downward directions.

[0013] Preferably, each pivot arm has a limiting protrusion on the outer side of its adjacent end; the support member is provided with a limiting hole relative to the limiting protrusion on each pivot arm to limit the upward direction of the limiting protrusion.

[0014] Preferably, the maximum diameter of the limiting protrusion is smaller than the left and right width of the limiting hole, and the bottom of the limiting protrusion facing the bottom plate is configured as a ramp structure.

[0015] Preferably, the bottom plate corresponding to the central positioning groove is provided with a clearance groove that allows the end of the pivot arm to descend, and the two sides of the central positioning groove are provided with arc-shaped support frames that can restrict the downward movement of the central positioning column.

[0016] Preferably, the two ends of the reset spring are provided with hooks, and the linkage wing and trigger wing are provided with connecting holes for connecting the hooks. The two ends of the reset spring are respectively fixed to the connecting holes by the hooks.

[0017] Preferably, the electrical component is a photodiode assembly consisting of a light-emitting element and a photosensitive element, which is mounted on the PCB board via surface mount electrical connection. The triggering structure is a grating plate constructed between the pivot arms on both sides of the trigger wing. When the keycap is pressed, the grating plate of the trigger wing moves downward to change the light path between the light-emitting element and the photosensitive element.

[0018] Preferably, the grating plate is a light-shielding plate, and the light-emitting element and the photosensitive element are located on both sides of the light-shielding plate.

[0019] Preferably, the grating plate is a reflector, and the light-emitting element and the photosensitive element are located on the same side of the reflector.

[0020] Preferably, the bottom of the grating plate is provided with a void-avoiding column, and the bottom plate is provided with void-avoiding holes corresponding to the void-avoiding column.

[0021] Preferably, the electrical component is a Hall sensor mounted on the PCB board via a surface mount connection, and the triggering structure is a magnetic component constructed between the pivot arms on both sides of the trigger wing. When the keycap is pressed, the magnetic component of the trigger wing moves downward to change the magnetic flux received by the Hall sensor.

[0022] Preferably, the keycap is provided with a pivot cavity for pivoting the top of the trigger wing and the linkage wing, and the two ends of the trigger wing and the linkage wing have pivot posts corresponding to the pivot cavity. The top of the trigger wing and the linkage wing are restricted to the pivot cavity on the keycap by the pivot posts.

[0023] Preferably, the button also includes a sound-generating mechanism for producing a striking sound when the button is pressed.

[0024] Preferably, the sound-generating mechanism includes a sound-generating torsion spring mounted on the pivot arm of the linkage wing. The sound-generating torsion spring has a fixed arm and a sound-generating arm. The linkage wing has a sound-generating energy storage part corresponding to the sound-generating arm. The bottom of the keycap has a sound-generating pressure block corresponding to the sound-generating arm. The sound-generating energy storage part has a wedge part and a striking part located on the wedge part. The sound-generating arm abuts against the wedge part. When the keycap is pressed, the sound-generating pressure block applies pressure to the sound-generating arm to store downward force. When the keycap is pressed to a certain stroke, the sound-generating arm slides away from the sound-generating pressure block under the action of the wedge part, resets upward, and strikes the striking part to produce a knocking sound. When the keycap is released, the sound-generating pressure block moves upward and leaves the sound-generating arm, and the sound-generating arm resets.

[0025] Preferably, the pivot arm for mounting the sound-generating torsion spring has a torsion spring fixing post and a fixing arm limiting block, the sound-generating torsion spring is fitted on the torsion spring fixing post, and the fixing arm of the sound-generating torsion spring abuts against the fixing arm limiting block.

[0026] The beneficial effects of this invention are: by adopting a trigger wing and a linkage wing that are pivotally connected to each other, and in conjunction with a tension spring and other structures, the limit cover structure is reduced, and the vertical movement stroke is further reduced while ensuring stable pressing balance. The positioning and cooperation between the linkage components are stable, which makes the button structure more material-saving and thinner. In addition, the button also has the functions of outputting photoelectric signals and pressing to produce sound, providing users with a flat pressing feel, easy assembly and disassembly, and suitable for industrial mass production. Attached Figure Description

[0027] Figure 1 This is an exploded view of the present invention;

[0028] Figure 2 This is a schematic diagram of the connecting seat in the present invention;

[0029] Figure 3 This is a schematic diagram of the keycap structure in this invention;

[0030] Figure 4 This is a schematic diagram of the linkage wing structure in this invention;

[0031] Figure 5 This is a schematic diagram of the trigger wing structure in this invention;

[0032] Figure 6 This is a reference diagram showing the unpressed state of the linkage wing and the trigger wing in this invention;

[0033] Figure 7 This is a reference diagram showing the pressing state of the linkage wing and the trigger wing in this invention;

[0034] Figure 8 This is a schematic diagram of the assembly structure of the support component and the linkage component in this invention;

[0035] Figure 9 This is a schematic diagram of the bottom structure of the trigger wing in this invention.

[0036] In the diagram: 1. Keycap; 11. Sound-producing block; 12. Pivot cavity;

[0037] 2. Base plate; 21. Clearance holes;

[0038] 3. Linkage Wing; 31. Sound-generating Torsion Spring; 311. Fixed Arm; 312. Sound-generating Arm; 32. Sound-generating Energy Storage Unit; 321. Inclined Block; 322. Impact-receiving Unit; 33. Fixed Arm Limiting Block; 34. Torsion Spring Fixing Post;

[0039] 4. Trigger wing; 41. Sunshade; 42. Air-blocking column;

[0040] 5. Pivot arm; 51. Tilt fulcrum; 52. Center positioning post; 53. Pivot shaft; 54. Pivot hole; 55. Limiting protrusion; 56. Connecting hole;

[0041] 6. Support components; 61. Center positioning groove; 62. Limiting hole; 63. Arc-shaped support frame; 64. Clearance groove;

[0042] 7. Reset spring; 71. Hook; 8. Optical pair assembly; 9. PCB board. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To provide a clear and complete description of the technical solution, the following embodiments are selected for illustration; these embodiments are only some embodiments of the present invention; other embodiments obtained based on this application without inventive effort are all within the scope of protection of the present invention.

[0044] In the following embodiments, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top / bottom," etc., are all based on the orientation or positional relationship shown in the accompanying drawings and are only for the purpose of clearly describing this embodiment. They do not indicate or imply that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this application. At the same time, the terms "first" and "second" in the embodiments are only used for descriptive purposes and do not represent an indication or implication of relative importance.

[0045] like Figure 1-9 As shown, a specific embodiment of this application is an ultra-thin balanced key for triggering electronic components on a PCB board 9 to generate signals. It includes a keycap 1, a base plate 2, and a linkage component disposed between the keycap 1 and the base plate 2. The PCB board 9 is disposed on the base plate 2 and designed according to the components and corresponding openings on the base plate 2. The linkage component allows the keycap 1 to move downwards synchronously when pressed at any position. The linkage component includes a linkage wing 3 and a trigger wing 4 pivotally connected to each other. Both sides of the linkage wing 3 and the trigger wing 4 extend pivot arms 5. The ends of the pivot arms 5 of the linkage wing 3 and the trigger arms 5 of the trigger wing 4 are pivotally connected. Each pivot arm 5 is provided with a limiting structure. The base plate 2 is also provided with a support component 6 that cooperates with the limiting structure to limit the linkage component.

[0046] The linkage component also includes a return spring 7, one end of which is connected to the linkage wing 3 and the other end to the trigger wing 4. Hooks 71 are provided on the lever arms at both ends of the return spring 7. Connecting holes 56 for connecting the hooks 71 are provided on the linkage wing 3 and the trigger wing 4. The lever arms at both ends of the return spring 7 are connected to the connecting holes 56 respectively via the hooks 71. The keycap 1 is fastened to the upper part of the linkage wing 3 and the trigger wing 4. When no external force is applied, the return spring 7 is in a contracted state, pulling the linkage wing 3 and the trigger wing 4 upwards. When the keycap 1 is pressed, the linkage wing 3 and the trigger wing 4 move downwards simultaneously, stretching the return spring 7 until it retracts and returns to its original position after the keycap is released.

[0047] Each pivot arm 5 has a rocking fulcrum 51 near its end facing the base plate 2. When the keycap 1 is pressed, the linkage wing 3 and the trigger wing 4 descend around the rocking fulcrum 51 of the pivot arm 5, and the end of the pivot arm 5 rises but is limited to the support member 6 by the limiting structure. When the keycap 1 is released, the reset spring 7 contracts and pulls the linkage wing 3 and the trigger wing 4 upward.

[0048] The limiting structure of the pivot arm 5 of this button includes a central positioning post 52 and a limiting protrusion 55. Specifically, one of the pivot arms 5 of the linkage wing 3 has a central positioning post 52 on the outer side of its end and a pivot shaft 53 on the inner side, and the other pivot arm 5 of the linkage wing 3 has only a pivot hole 54 at its end; one of the pivot arms 5 of the trigger wing 4 has a central positioning post 52 on the outer side of its end and a pivot shaft 53 on the inner side, and the other pivot arm 5 of the trigger wing 4 has only a pivot hole 54 at its end; the linkage wing 3 and the trigger wing 4 are coupled to each other's pivot holes 54 through their respective pivot shafts 53 to form a pivot relationship. During installation, the support component 6 is provided with a central positioning groove 61 relative to the central positioning post 52 of the linkage wing 3 and the trigger wing 4, which limits the central positioning post 52 in the left, right and downward directions. A clearance groove 64 corresponding to the end of the pivot arm 5 is provided on the base plate 2. The central positioning groove 61 can prevent the end of the pivot arm 5 from shifting left and right. In addition, a clearance groove 64 is provided on the base plate 2 corresponding to the central positioning groove 61 to allow the end of the pivot arm 5 to move downward. On both sides of the central positioning groove 61, at the location of the clearance groove 64, an arc-shaped support frame 63 is provided to limit the downward movement of the central positioning post 52. When the central positioning post 52 falls to the arc-shaped support frame 63, the end of the pivot arm 5 falls into the clearance groove 64. The arc-shaped support frame 63 can limit the bottom of the central positioning post 52 to prevent the end of the pivot arm 5 from sliding downward. The clearance groove 64 plays a clearance role for the end of the pivot arm 5 to prevent the end of the pivot arm 5 from hitting the base plate 2.

[0049] The limiting protrusion 55 is located on the outer side of the adjacent end of each pivot arm 5. The support member 6 is provided with a limiting hole 62 relative to the limiting protrusion 55 on each pivot arm 5, limiting the upward direction of the limiting protrusion 55 so that when the pivot arm 5 tilts upward around the fulcrum 51, the limiting protrusion on the pivot arm 5 is always confined within the limiting hole 62. Preferably, the bottom of the limiting protrusion 55 facing the base plate 2 is configured as a ramp structure, allowing for smoother rotation within the limiting hole 62. After the linkage wing 3 and trigger wing 4 are connected via the pivot arm 5, since the maximum diameter of the limiting protrusion 55 is smaller than the left and right width of the limiting hole 62, the limiting protrusion 55 can be directly aligned with the limiting hole 62 and inserted for locking.

[0050] The button in this application can be configured as a photoelectric button capable of outputting photoelectric signals. The electrical components of the button are phototransistor assemblies 8 composed of light-emitting elements and photosensitive elements, which are mounted on the PCB board 9 with surface-mount electrical connections. The triggering structure is a grating plate constructed between the pivot arms 5 on both sides of the trigger wing 4. When the keycap is pressed, the grating plate of the trigger wing 4 moves downward to change the light path between the light-emitting element and the photosensitive element, thereby outputting photoelectric signals.

[0051] The photoelectric key's grating plate is preferably a light-shielding plate 41, with the light-emitting element and the photosensitive element located on both sides of the light-shielding plate 41, forming a light path between the light-emitting element and the photosensitive element. The downward movement of the light-shielding plate 41 changes the light path between the light-emitting element and the photosensitive element.

[0052] The grating plate of the photoelectric key is preferably a reflector, with the light-emitting element and the photosensitive element located on the same side of the reflector. When the reflector moves downward, the light emitted by the light-emitting element is reflected by the reflector to the photosensitive element to form a light path.

[0053] In order for the grating board to reach the PCB board 9, a clearance post 42 is provided at the bottom of the grating board, and clearance holes 21 corresponding to the clearance post 42 are provided on the base plate 2.

[0054] The button in this application can be configured as an electromagnetic button capable of outputting electromagnetic signals. The electrical component is a Hall sensor that is surface-mounted and electrically connected on the PCB board 9. The triggering structure is a magnetic component constructed between the pivot arms 5 on both sides of the trigger wing 4. When the keycap is pressed, the magnetic component of the trigger wing 4 moves downward to change the magnetic flux received by the Hall sensor.

[0055] To prevent the keycap 1 from wobbling horizontally, the keycap 1 is provided with a pivot cavity 12 for pivoting the top of the trigger wing 4 and the linkage wing 3. The two ends of the trigger wing 4 and the linkage wing 3 have pivot posts corresponding to the pivot cavity 12. The top ends of the trigger wing 4 and the linkage wing 3 are restricted to the pivot cavity 12 on the keycap 1 by the pivot posts. The pivot cavity 12 can prevent the keycap 1 from wobbling left and right on the keycap due to the gap caused by the reduced distance between the two ends of the linkage wing 3 and the trigger wing 4 after they are reset and moved upward.

[0056] This button can be used as a mute or sound-emitting button. When used as a sound-emitting button, the button also includes a sound-emitting mechanism for producing a striking sound when the button is pressed. The sound-emitting mechanism includes a sound-emitting torsion spring 31 mounted on the pivot arm of the linkage wing 3. The sound-emitting torsion spring 31 has a fixed arm 311 and a sound-emitting arm 312. The linkage wing 3 is provided with a sound-emitting energy storage part 32 corresponding to the sound-emitting arm 312. The bottom of the keycap 1 is provided with a sound-emitting pressure block 11 corresponding to the sound-emitting arm 312. The sound-emitting energy storage part 32 has a wedge part 3. 21 and the impacted part 322 located on the inclined block 321, the sound-emitting arm 312 abuts against the inclined block 321; when the keycap 1 is pressed, the sound-emitting block 11 applies pressure to the sound-emitting arm 312 to store downward force, when the keycap 1 is pressed to a certain stroke, the sound-emitting arm 312 slides away from the sound-emitting block 11 under the action of the inclined block 321, resets upward and strikes the impacted part 322 to produce a knocking sound, when the keycap 1 is released and the sound-emitting block 11 moves upward to leave the sound-emitting arm 312, the sound-emitting arm 312 resets.

[0057] Specifically, the sound-generating torsion spring 31 is fixed to the pivot arm 5 by the torsion spring fixing post 34 and the fixing arm limiting block 33. The sound-generating torsion spring 31 is fitted on the torsion spring fixing post 34, and the fixing arm 311 of the sound-generating torsion spring 31 abuts against the fixing arm limiting block 33.

[0058] When installing this button, assemble the PCB board 9 onto the base plate 2, attach electrical components to the PCB board 9, and then pivot the linkage wing 3 and the trigger wing 4 together through the pivot arm 5. Press the limiting protrusion 55 into the limiting hole 62, and use the center positioning post 52 to position the pivot arm 5. Then install the sound-generating torsion spring 31 and the reset spring 7, and finally fasten the top of the linkage wing 3 and the trigger wing 4 to the keycap 1.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultra-thin balanced key for triggering signals from electrical components mounted on a PCB board, comprising a keycap, a base plate, and a linkage component disposed between the keycap and the base plate, characterized in that: The linkage component includes a linkage wing and a trigger wing that are pivotally connected to each other. Both sides of the linkage wing and the trigger wing have pivot arms extending from them. The ends of the pivot arms of the linkage wing and the trigger wing are pivotally connected to each other. Each pivot arm is provided with a limiting structure. The base plate is also provided with a bracket component that cooperates with the limiting structure to limit the linkage component. Each pivot arm has a wobbling fulcrum that abuts against the base plate on the side near its end. The linkage component also includes a reset spring, one end of which is connected to the linkage wing and the other end is connected to the trigger wing; The keycap is fastened to the upper part of the linkage wing and the trigger wing, and the trigger wing is equipped with a trigger structure that triggers electrical components to generate signals; One of the pivot arms of the linkage wing has a central positioning post on the outer side of its end and a pivot shaft on its inner side; the other pivot arm of the linkage wing has only a pivot hole at its end. One of the pivot arms of the trigger wing has a central positioning post on the outer side of its end and a pivot shaft on its inner side; the other pivot arm of the trigger wing has only a pivot hole at its end. The linkage wing and the trigger wing are connected to each other via their respective pivot shafts and pivot holes to form a pivotal relationship. The support component has a central positioning groove on each of the central positioning posts of the linkage wing and the trigger wing to limit the movement of the central positioning posts in the left, right, and downward directions. The key also includes a sound-generating mechanism for producing a striking sound when the key is pressed. The sound-generating mechanism includes a sound-generating torsion spring mounted on the pivot arm of the linkage wing. The sound-generating torsion spring has a fixed arm and a sound-generating arm. The linkage wing has a sound-generating energy storage part corresponding to the sound-generating arm. The bottom of the keycap has a sound-generating pressure block corresponding to the sound-generating arm. The sound-generating energy storage part has a sloping block part and a striking part located on the sloping block part. The sound-generating arm abuts against the sloping block part. When the keycap is pressed, the sound-generating pressure block applies pressure to the sound-generating arm to store downward force. When the keycap is pressed to a certain stroke, the sound-generating arm slides away from the sound-generating pressure block under the action of the sloping block part, resets upward, and strikes the striking part to produce a striking sound. When the keycap is released, the sound-generating pressure block moves upward and leaves the sound-generating arm, and the sound-generating arm resets.

2. The ultra-thin balance button according to claim 1, characterized in that, Each pivot arm has a limiting protrusion on the outer side near its end; the support member is provided with a limiting hole relative to the limiting protrusion on each pivot arm to limit the upward direction of the limiting protrusion.

3. The ultra-thin balance button according to claim 2, characterized in that, The maximum diameter of the limiting protrusion is smaller than the left and right width of the limiting hole, and the bottom of the limiting protrusion facing the bottom plate is configured as a ramp structure.

4. The ultra-thin balance button according to claim 2, characterized in that, The bottom plate corresponding to the central positioning groove is provided with a clearance groove that allows the end of the pivot arm to descend. On both sides of the central positioning groove, at the location of the clearance groove, an arc-shaped support frame is constructed to restrict the descent of the central positioning column.

5. The ultra-thin balance button according to claim 1, characterized in that, The return spring has hooks on both ends of its lever arms, and the linkage wing and trigger wing have connecting holes for connecting the hooks. The two ends of the return spring are fixed to the connecting holes by the hooks.

6. The ultra-thin balance button according to claim 2, characterized in that, The electrical component is a photodiode assembly consisting of a light-emitting element and a photosensitive element, which is mounted on the PCB board via surface mount electrical connection. The triggering structure is a grating plate constructed between the pivot arms on both sides of the trigger wing. When the keycap is pressed, the grating plate of the trigger wing moves downward to change the light path between the light-emitting element and the photosensitive element.

7. The ultra-thin balance button according to claim 6, characterized in that, The grating plate is a light-shielding plate, and the light-emitting element and the photosensitive element are located on both sides of the light-shielding plate.

8. The ultra-thin balance button according to claim 6, characterized in that, The grating plate is a reflector, and the light-emitting element and the photosensitive element are located on the same side of the reflector.

9. The ultra-thin balance button according to claim 6, characterized in that, A void-avoiding post is provided at the bottom of the grating plate, and void-avoiding holes corresponding to the void-avoiding post are provided on the bottom plate.

10. The ultra-thin balance button according to claim 2, characterized in that, The electrical component is a Hall sensor mounted on the PCB board via surface mount electrical connection. The triggering structure is a magnetic component constructed between the pivot arms on both sides of the trigger wing. When the keycap is pressed, the magnetic component of the trigger wing moves downward to change the magnetic flux received by the Hall sensor.

11. The ultra-thin balance button according to claim 2, characterized in that, The keycap is provided with a pivot cavity for pivoting the top of the trigger wing and the linkage wing. The two ends of the trigger wing and the linkage wing have pivot posts corresponding to the pivot cavity. The top of the trigger wing and the linkage wing are restricted to the pivot cavity on the keycap by the pivot posts.

12. The ultra-thin balance button according to any one of claims 1 to 11, characterized in that, The pivot arm on which the sound-generating torsion spring is mounted has a torsion spring fixing post and a fixing arm limiting block. The sound-generating torsion spring is mounted on the torsion spring fixing post, and the fixing arm of the sound-generating torsion spring abuts against the fixing arm limiting block.

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