Key structure and keyboard

Abstract

The present application provides a key structure and a keyboard. The key structure comprises a base, a cover and a key cap. The base comprises a lower cover and a resilient convex disposed above the lower cover and having a first hole. The cover is fixedly disposed above the base and has an opening. The key cap is detachably connected with the cover and has a cap body and a striking column. The cap body is slidably through the opening of the cover, and the striking column protrudes from the cap body towards the base and extends into the first hole. When the key cap is pressed towards the cover, the key cap presses the resilient convex, and the striking column strikes the base to produce a sound. The keyboard comprises a plurality of the aforementioned key structures. The plurality of covers and the plurality of lower covers corresponding to the plurality of key structures are respectively formed by a single component. The key structure and the keyboard provided by the present application are designed to produce a sound (the striking column strikes the base) and the produced sound is stable. When the user presses the key cap, stable auditory feedback can be obtained.

Description

Technical Field

[0001] This invention relates to a key structure and keyboard, and more particularly to a key structure and keyboard capable of producing a pressing sound. Background Technology

[0002] Current mechanical keys typically have multiple moving components. During operation, such as when a user presses a keycap, some components may collide with each other, producing a sound. Furthermore, the components involved in producing the sound vary each time. While the sound provides auditory feedback to the user, it is not intentionally designed and is unstable; it is essentially noise. Summary of the Invention

[0003] The purpose of this invention is to provide a key structure and keyboard, which uses a downwardly protruding impact post on the keycap to strike the base when the keycap is pressed to produce a stable sound.

[0004] This invention proposes a key structure comprising a base, a top cover, and a keycap. The base includes a bottom cover and a resilient protrusion, the resilient protrusion being disposed above the bottom cover and having a first hole. The top cover is fixedly disposed above the base and has an opening. The keycap is detachably connected to the top cover, and the keycap has a cap body and an impact post. The cap body slidably passes through the opening, and the impact post protrudes from the cap body toward the base and extends into the first hole. When the keycap is pressed toward the top cover, the keycap compresses the resilient protrusion, and the impact post strikes the base to produce a sound.

[0005] As an optional technical solution, the impact post passes through the first hole and strikes the lower cover to produce the sound.

[0006] As an optional technical solution, the base includes a switch circuit board stacked on the lower cover. The switch circuit board has a second hole. The impact post passes through the first hole of the elastic protrusion and the second hole of the switch circuit board and impacts the lower cover to produce the sound.

[0007] As an optional technical solution, the switch circuit board includes an annular switch contact arranged around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

[0008] As an optional technical solution, the base includes a thin film, which is stacked on the lower cover. The film is made of a different material than the lower cover. The impact post passes through the first hole and impacts the film to produce the sound.

[0009] As an optional technical solution, the base includes a switch circuit board and a film. The switch circuit board is stacked on the lower cover, and the film is stacked on the switch circuit board. The film is made of a different material than the lower cover. The switch circuit board has a second hole. The impact post passes through the first hole of the elastic protrusion and presses against the film to impact the lower cover through the second hole of the switch circuit board to generate the sound.

[0010] As an optional technical solution, the switch circuit board includes an annular switch contact arranged around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

[0011] As an optional technical solution, the base includes a switch circuit board stacked on the lower cover. The impact post passes through the first hole of the elastic protrusion and presses against the switch circuit board to impact the lower cover to produce the sound.

[0012] As an optional technical solution, the switch circuit board has a layered structure, which includes a substrate. The impact post passes through the first hole of the elastic protrusion and presses against the substrate to impact the lower cover through the substrate to generate the sound.

[0013] As an optional technical solution, the first hole of the elastic convex is a blind hole with a bottom. The bottom is a thin film structure, and the impact post presses against the bottom to impact the lower cover to produce the sound.

[0014] As an optional technical solution, the base includes a switch circuit board stacked on the lower cover. The switch circuit board has a second hole, and the impact post presses against the bottom to impact the lower cover through the second hole of the switch circuit board to produce the sound.

[0015] As an optional technical solution, the switch circuit board includes an annular switch contact arranged around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

[0016] As an optional technical solution, the base includes a flexible shallow dish placed on the lower cover. The flexible shallow dish is made of a different material than the lower cover. The impact post passes through the first hole and presses against the flexible shallow dish to impact the lower cover and produce the sound.

[0017] As an optional technical solution, the base includes a switch circuit board and a flexible shallow dish. The switch circuit board is stacked on the lower cover and has a second hole. The flexible shallow dish is disposed on the lower cover and located in the second hole of the switch circuit board. The impact post passes through the first hole of the flexible protrusion and presses against the flexible shallow dish to impact the lower cover through the flexible shallow dish to generate the sound.

[0018] As an optional technical solution, the switch circuit board includes an annular switch contact arranged around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

[0019] As an optional technical solution, the impact post is detachably and fixedly connected to the cap body.

[0020] As an optional technical solution, the upper cover and the lower cover are fixedly connected.

[0021] The present invention also provides a keyboard comprising a plurality of the aforementioned key structures. Each of the plurality of upper covers corresponding to the plurality of key structures is formed from a single component, and each of the plurality of lower covers corresponding to the plurality of key structures is formed from a single component.

[0022] As an optional technical solution, the multiple elastic protrusions corresponding to the multiple button structures are formed by a single component.

[0023] The key structure and keyboard of this invention feature a sound-generating mechanism (the impact pin striking the base) designed to produce a stable sound. Users receive stable auditory feedback when pressing the keycaps. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the button structure according to the first embodiment of the present invention.

[0025] Figure 2 for Figure 1 Exploded view of the button structure.

[0026] Figure 3 for Figure 1 A cross-sectional view of the key structure along line XX.

[0027] Figure 4 for Figure 3 A cross-sectional view of the button structure when it is pressed.

[0028] Figure 5 An exploded view of a variation of a keycap.

[0029] Figure 6 This is a cross-sectional view of the button structure according to the second embodiment of the present invention.

[0030] Figure 7 for Figure 6 A cross-sectional view of a variation of the button structure.

[0031] Figure 8 for Figure 7 A cross-sectional view of the button structure when it is pressed.

[0032] Figure 9 This is a cross-sectional view of the button structure according to the third embodiment of the present invention.

[0033] Figure 10 for Figure 9 A cross-sectional view of a variation of the button structure.

[0034] Figure 11 This is a cross-sectional view of the button structure according to the fourth embodiment of the present invention.

[0035] Figure 12 for Figure 11 A cross-sectional view of the button structure when it is pressed.

[0036] Figure 13 This is a cross-sectional view of the button structure according to the fifth embodiment of the present invention.

[0037] Figure 14 for Figure 13 A cross-sectional view of the button structure when it is pressed.

[0038] Figure 15 This is a schematic diagram of the keyboard according to the sixth embodiment of the present invention.

[0039] Figure 16 for Figure 15 An exploded view of the Chinese keyboard.

[0040] Figure 17 for Figure 15 A cross-sectional view along the YY line of the middle keyboard. Detailed Implementation

[0041] To provide a further understanding of the purpose, structure, features and functions of the present invention, detailed descriptions are provided below with reference to embodiments.

[0042] The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the accompanying diagrams. Prefixes for component names, such as first, second, etc., are only for distinguishing components and facilitating description, and do not impose any other limitations on the components; furthermore, components with the same prefix in different embodiments do not necessarily correspond. The correspondence of components in each embodiment should still be determined according to the specific structure described in each embodiment.

[0043] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the button structure according to the first embodiment of the present invention; Figure 2 for Figure 1 Exploded view of the button structure in the middle; Figure 3 for Figure 1 A cross-sectional view of the button structure along line XX. (See attached image.) Figure 1-3As shown, the key structure 1 of the first embodiment of the present invention includes a base 12, an upper cover 14, and a keycap 16. The base 12 includes a lower cover 122, an elastic protrusion 124, and a switch circuit board 126. The switch circuit board 126 is stacked on the lower cover 122, and the elastic protrusion 124 is disposed above the lower cover 122 (or stacked on the switch circuit board 126) and has a first hole 124a. The upper cover 14 is fixedly disposed above the base 12, for example, the upper cover 14 is directly fixedly connected to the lower cover 122 around its perimeter (e.g., by screw fastening, snap-fit ​​connection, etc.). The upper cover 14 has an opening 142, which penetrates the upper cover 14 in the vertical direction Dv and is aligned with the first hole 124a of the elastic protrusion 124. The keycap 16 is detachably connected to the upper cover 14. The keycap 16 has a cap body 162 and an impact post 164, the impact post 164 protruding from the cap body 162 toward the base 12. The keycap 162 has a guide post 162a, and the opening 142 of the upper cover 14 forms a groove, with the guide post 162a matching the contour of the opening 142. The keycap 162 is slidably connected to the groove via the guide post 162a, allowing the guide post 162a to slidably pass through the opening 142, enabling the keycap 16 to move up and down relative to the upper cover 14 (or move parallel to the vertical direction Dv). Two limiting hooks 162b are provided on opposite sides of the guide post 162a, which can hook the lower edge of the opening 142 to prevent the keycap 16 from detaching from the upper cover 14. An impact post 164 protrudes from the keycap 162 toward the base 12 and extends into the first hole 124a of the elastic protrusion 124. The elastic protrusion 124 also supports the keycap 16, providing a rebound force for the keycap 16 to move upward.

[0044] Please see Figure 3 and Figure 4 ; Figure 3 The middle button structure 1 is in the unpressed state. Figure 4 The key structure 1 is in a pressed state. When the keycap 16 is pressed towards the upper cover 14, the keycap 16 compresses the elastic protrusion 124 (causing the elastic protrusion 124 to elastically deform), and the impact post 164 impacts the base 12 to produce a sound. Furthermore, in the first embodiment, the switch circuit board 126 has a second hole 126a (in... Figure 3 and Figure 4 (Indicated by a dashed box). The impact post 164 passes through the first hole 124a of the elastic protrusion 124 and the second hole 126a of the switch circuit board 126 and impacts the lower cover 122 to produce the sound. Furthermore, the switch circuit board 126 is a single-layer structure (e.g., but not limited to, a thin-film circuit board; in...). Figure 2(Represented as a single board for simplification), it includes an upper substrate 1262, a lower substrate 1264, and a spacer layer 1266. Circuits are respectively disposed on the upper substrate 1262 and the lower substrate 1264. The spacer layer 1266 is sandwiched between the upper substrate 1262 and the lower substrate 1264 to prevent accidental direct contact between the circuits on the upper substrate 1262 and the lower substrate 1264. A hole 126a of the switch circuit board 126 penetrates the upper substrate 1262, the lower substrate 1264, and the spacer layer 1266. The circuit on the upper substrate 1262 forms a ring-shaped switch contact 1262a, and the circuit on the lower substrate 1264 forms a ring-shaped switch contact 1264a. These two ring-shaped switch contacts 1262a and 1264a (at...) Figure 2 (In the image, represented by a single dashed ring) is positioned opposite to and surrounds the second hole 126a. When the keycap 16 is pressed towards the top cover 14, the keycap 16 compresses the elastic protrusion 124 to bring the two annular switch contacts 1262a and 1264a into direct contact, thereby triggering the two annular switch contacts 1262a and 1264a. When the keycap 16 is no longer pressed, the elastically deformed protrusion 124 springs back and pushes the keycap 16 back to its original position.

[0045] Furthermore, in the first embodiment, the first hole 124a of the elastic protrusion 124 has the effect of stabilizing the keycap 16, reducing keycap 16 wobble, improving the feel, and reducing noise caused by keycap 16 wobble. Additionally, the impact point 164 of the keycap 16 impacts the lower cover 122, which is the sound-generating point and also the bottom dead center of the keycap 16's travel. The bottom dead center provided by the lower cover 122 (e.g., a rigid plastic part) provides more stable keycap 16 travel consistency than the bottom dead center provided by a softer material or structure, such as an elastic protrusion or a thin-film circuit board.

[0046] Furthermore, in practical operation, the sound produced by the impact post 164 striking the base 12 can be altered by designing the contact between the impact post 164 and the base 12 (including the portion of the base 12 struck by the impact post 164, and differences in material and structure between this portion and the impact post 164). In the first embodiment, the keycap 16 is integrally molded (e.g., a plastic injection molded part), and the lower cover 122 is a plastic part; however, this is not a limitation in practical operation. For example, in such... Figure 5In the keycap 17 shown, the cap body 172 and the strike post 174 are designed as a combination. The strike post 174 is inserted into the hole of the cap body 172 and detachably fixed to the cap body 172 to form a keycap 17 with the same function as the keycap 16 in the first embodiment. At this time, the cap body 172 and the strike post 174 can be made of different materials. For example, the cap body 172 is still a plastic injection molded part, while the strike post 174 is a metal part. In this variation, the user can replace different strike posts 174 (e.g., different materials, different impact point structures, etc.) to change the sound produced by the strike post 174 striking the base 12. In addition, even in the key structure 1, the user can also replace different strike posts 164 (e.g., different materials, different impact point structures, etc.) to change the sound. Furthermore, in actual operation, the keycap 16 can also be made by embedded injection molding, so that the cap body 162 and the strike post 164 are made of different materials.

[0047] Please see Figure 6 This is a cross-sectional view of the button structure 3 according to the second embodiment of the present invention, and its cross-sectional position is the same as that of button structure 1. The button structure 3 is largely the same as the button structure 1, so the component symbols of button structure 3 are used in button structure 1. For other descriptions of button structure 3, please refer directly to the relevant descriptions of the same named components in button structure 1, which will not be repeated here. The main difference between button structure 3 and button structure 1 is that button structure 3 also includes a membrane 32, which is stacked on the lower cover 122, and the switch circuit board 126 is then stacked on the membrane 32. When the keycap 16 is pressed, the impact post 164 passes through the first hole 124a of the elastic protrusion 124 and the second hole 126a of the switch circuit board 126 and impacts the membrane 32 to produce a sound. The membrane 32 is made of a different material than the lower cover 122, for example, making the membrane 32 more flexible than the lower cover 122. The thickness of the membrane 32 can be obtained through actual testing according to the desired sound timbre, which will not be repeated here.

[0048] In button structure 3, the membrane 32 is sandwiched between the lower cover 122 and the switch circuit board 126, but in actual operation, this is not a limitation. For example, as Figure 7 As shown, in this variation of the button structure 3', the switch circuit board 126 is stacked on the lower cover 122, and the thin film 32 is then stacked on the switch circuit board 126. Figure 8 As shown, when the keycap 16 is pressed, the impact post 164 passes through the first hole 124a of the elastic protrusion 124 and presses against the diaphragm 32 to strike the lower cover 122 through the second hole 126a of the switch circuit board 126 to produce the sound.

[0049] In button structure 3 and button structure 3', the membrane 32 is a component outside the switch circuit board 126, but in actual operation it is not limited to this. For example, please refer to Figure 9This is a cross-sectional view of the button structure 4 according to the third embodiment of the present invention; its cross-sectional position is the same as that of button structure 1. The button structure 4 is substantially the same as that of button structure 1, so the component symbols of button structure 4 are adopted by button structure 1. For other descriptions of button structure 4, please refer directly to the relevant descriptions of the same named components in button structure 1, which will not be repeated here. The main difference between button structure 4 and button structure 1 is that the switch circuit board 426 of the base 42 of button structure 4 no longer forms a through hole corresponding to the impact post 164. The upper substrate 1262 and the spacer layer 1266 of switch circuit board 426 still form an opening, but the lower substrate 4264 no longer forms an opening, so that when the keycap 16 is pressed, the impact post 164 passes through the first hole 124a of the elastic protrusion 124 and impacts the lower substrate 4264 to produce a sound. In other words, the mechanism for producing sound in button structure 4 is equivalent to the mechanism for producing sound in button structure 3; wherein, button structure 4 is equivalent to integrating the thin film 32 structure of button structure 3 into switch circuit board 126 (to form the structure of switch circuit board 426). In practice, the lower substrate 4264 and the lower cover 122 are made of different materials, making the lower substrate 4264 more flexible than the lower cover 122.

[0050] In button structure 4, the impact post 164 strikes the lower substrate 4264 to produce sound, but in actual operation, this is not a limitation. For example, as Figure 10 As shown, in this variation of the button structure 4', the spacer layer 1266 and the lower substrate 1264 of the switch circuit board 426' of the base 42' still form an opening, but the upper substrate 4262 no longer forms an opening. When the keycap 16 is pressed, the impact post 164 passes through the first hole 124a of the elastic protrusion 124 and presses against the upper substrate 4262 to strike the lower cover 122 downward to produce the sound.

[0051] In button structures 4 and 4', logically they can both be considered as impact pillars 164 pressing against substrates (e.g., upper substrate 4262, lower substrate 4264) and impacting the lower cover 122 via these substrates to produce sound. In addition, in actual operation, the upper substrate 4262 and the lower substrate 4264 can also coexist, which will not be elaborated further.

[0052] Please see Figure 11 This is a cross-sectional view of the button structure 5 according to the fourth embodiment of the present invention; its cross-sectional position is the same as that of button structure 1. Button structure 5 is largely the same as button structure 1, therefore button structure 5 uses the component symbols of button structure 1. For other descriptions of button structure 5, please refer directly to the relevant descriptions of the same named components in button structure 1, which will not be repeated here. The main difference between button structure 5 and button structure 1 is that the first hole 524a of the elastic circular protrusion 524 of the base 52 of button structure 5 is a blind hole, and its bottom 524b is a thin film structure. For example... Figure 12As shown, when the keycap 16 is pressed, the impact post 164 presses against the bottom 524b to strike the lower cover 122 through the second hole 126a of the switch circuit board 126 to produce a sound. In actual operation, the elastic protrusion 524 can be rubber, and the thickness of the bottom 524b can be obtained through actual testing according to the desired sound timbre, which will not be elaborated further.

[0053] Please see Figure 13 This is a cross-sectional view of the button structure 6 according to the fifth embodiment of the present invention; its cross-sectional position is the same as that of button structure 1. Button structure 6 is largely the same as button structure 1, therefore, button structure 6 uses the component symbols of button structure 1. For other descriptions of button structure 6, please refer directly to the relevant descriptions of the same named components in button structure 1, which will not be repeated here. The main difference between button structure 6 and button structure 1 is that button structure 6 also includes a flexible shallow dish 62, which is disposed on the lower cover 122 and located in the second hole 126a of the switch circuit board 126. The flexible shallow dish 62 is made of a different material than the lower cover 122; for example, the flexible shallow dish 62 is a metal part. Figure 14 When the keycap 16 is pressed, the impact post 164 passes through the first hole 124a of the elastic protrusion 124 and presses against the elastic disc 62 to strike the lower cover 122 and produce a sound.

[0054] in addition, Figure 5 The keycap 17 shown is also applicable to key structures 3, 4, 5, 6 and their variations, and will not be described further. Furthermore, if key structures 1, 3, 4, 5, 6 and their variations are implemented in the same key structure, this key structure can also serve as an embodiment of a key structure capable of producing a stable sound; for example, a combination of key structure 5 and key structure 6, or the elastic protrusion 524 of key structure 5 replacing the elastic protrusion 124 of key structure 6, or the elastic shallow disc 62 of key structure 6 being inserted into the second hole 126a of the switch circuit board 126 of key structure 5.

[0055] Please see Figures 15 to 17 The keyboard 7 of the sixth embodiment of the present invention includes a lower shell 72, an upper shell 74, a plurality of keycaps 76, elastic circular protrusions 78, and a switch circuit board 80. The upper shell 74 is attached to the upper side of the lower shell 72 and together with the lower shell 72 forms an accommodating space 70. The upper shell 74 has a plurality of openings 742. The switch circuit board 80 is stacked on the lower shell 72, and the switch circuit board 80 has a plurality of pairs of switch contacts (at... Figure 16In the diagram, each pair of switch contacts is represented by a single circle filled with diagonal lines, and each pair of switch contacts corresponds to an opening 742. A flexible circular protrusion 78 is disposed above the lower housing 72 (or stacked on the switch circuit board 80). The flexible circular protrusion 78 includes multiple flexible circular protrusions 782, each corresponding to an opening 742 and also a pair of switch contacts. Multiple keycaps 76 are disposed on the upper housing 74, each corresponding to a multiple opening 742. Each keycap 76 has a cap body 762 and an impact post 764, the impact post 764 protruding from the cap body 762 toward the lower housing 72. The cap body 762 has a guide post 762a, the guide post 762a matching the contour of the opening 742. The cap body 762 is slidably connected to the corresponding opening 742 via the guide post 762a, allowing the keycap 76 to move up and down relative to the upper housing 74 (or move parallel to the vertical direction Dv).

[0056] In the sixth embodiment, the keyboard 7 structure is equivalent to a combination of multiple key structures 1. For example... Figure 17 As shown, a button structure 1 is represented by a dashed box; wherein, the lower cover 122 of button structure 1 (and see...) Figure 3 (The same applies below) The part corresponding to the lower shell 72 of keyboard 7, the part corresponding to the upper shell 74 of keyboard 7, the part corresponding to the keycap 16 of key structure 1, the part corresponding to the keycap 76 of keyboard 7, the part corresponding to the elastic protrusion 124 of key structure 1, the part corresponding to the elastic protrusion 782 (of elastic protrusion sheet 78), and the part corresponding to the switch circuit board 126 of key structure 1, the part corresponding to the switch circuit board 80 of keyboard 7. For other explanations of the key structures in keyboard 7, please refer directly to the relevant explanations of key structure 1 above, which will not be repeated here. Therefore, in keyboard 7, the upper shell 74 of all key structures 1 is formed by a single component (i.e., upper shell 74), the lower shell 72 of all key structures 1 is also formed by a single component (i.e., lower shell 72), the elastic protrusion 124 of all key structures 1 is also formed by a single component (i.e., elastic protrusion sheet 78), and the switch circuit board 126 of all key structures 1 is formed by a single component (i.e., switch circuit board 80). Furthermore, in principle, key structures 1, 3, 4, 5, and 6, and their variations (including combinations of key structures as described above, such as the combination of key structure 5 and key structure 6) can all be applied to keyboard 7, without further explanation. Also, keyboard 7 is a nine-key keyboard, but in practice it is not limited to this; for example, the structure of keyboard 7 can be extended to a computer keyboard, without further explanation.

[0057] In summary, the key structure and keyboard provided by this invention have a specially designed sound-generating mechanism (impact post striking the base) that produces a stable sound. Users can obtain stable auditory feedback when pressing the keycaps.

[0058] Although the invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the invention and should not be construed as limiting the invention. The scale in the schematic drawings does not represent the actual proportions of the components, in order to clearly describe the required parts.

[0059] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A button structure, characterized in that... Include: A base, comprising a lower cover and a resilient protrusion, the resilient protrusion being disposed above the lower cover and having a first hole; The top cover is fixedly mounted on top of the base and has an opening; as well as A keycap, which is detachably connected to the top cover, has a cap body and an impact pin, the cap body being slidably passing through the opening, and the impact pin protruding from the cap body toward the base and extending into the first hole; When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion, and the impact post strikes the base to produce a sound.

2. The button structure as described in claim 1, characterized in that, The impact post passes through the first hole and strikes the lower cover to produce the sound.

3. The button structure as described in claim 1, characterized in that, The base includes a switch circuit board stacked on the lower cover. The switch circuit board has a second hole. The impact post passes through the first hole of the elastic protrusion and the second hole of the switch circuit board and impacts the lower cover to produce the sound.

4. The button structure as described in claim 3, characterized in that, The switch circuit board includes an annular switch contact disposed around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

5. The button structure as described in claim 1, characterized in that, The base includes a thin film, which is stacked on the lower cover. The film is made of a different material than the lower cover. The impact post passes through the first hole and strikes the film to produce the sound.

6. The button structure as described in claim 1, characterized in that, The base includes a switch circuit board and a film. The switch circuit board is stacked on the lower cover, and the film is stacked on the switch circuit board. The film is made of a different material than the lower cover. The switch circuit board has a second hole. The impact post passes through the first hole of the elastic protrusion and presses against the film to impact the lower cover through the second hole of the switch circuit board to produce the sound.

7. The button structure as described in claim 6, characterized in that, The switch circuit board includes an annular switch contact disposed around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

8. The button structure as described in claim 1, characterized in that, The base includes a switch circuit board stacked on the lower cover. The impact post passes through the first hole of the elastic protrusion and presses against the switch circuit board to strike the lower cover to produce the sound.

9. The button structure as described in claim 8, characterized in that, The switch circuit board has a layered structure, which includes a substrate. The impact post passes through the first hole of the elastic protrusion and presses against the substrate to impact the lower cover through the substrate to produce the sound.

10. The button structure as described in claim 1, characterized in that, The first hole of the elastic convex protrusion is a blind hole with a bottom. The bottom is a thin film structure. The impact post presses against the bottom to impact the lower cover to produce the sound.

11. The button structure as described in claim 10, characterized in that, The base includes a switch circuit board stacked on the lower cover. The switch circuit board has a second hole. The impact post presses against the bottom to strike the lower cover through the second hole of the switch circuit board to produce the sound.

12. The button structure as described in claim 11, characterized in that, The switch circuit board includes an annular switch contact disposed around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

13. The button structure as described in claim 1, characterized in that, The base includes a flexible shallow dish placed on the lower cover. The flexible shallow dish is made of a different material than the lower cover. The impact post passes through the first hole and presses against the flexible shallow dish to strike the lower cover and produce the sound.

14. The button structure as described in claim 1, characterized in that, The base includes a switch circuit board and a flexible shallow dish. The switch circuit board is stacked on the lower cover and has a second hole. The flexible shallow dish is disposed on the lower cover and located in the second hole of the switch circuit board. The impact post passes through the first hole of the flexible protrusion and presses against the flexible shallow dish to impact the lower cover through the flexible shallow dish to produce the sound.

15. The button structure as described in claim 14, characterized in that, The switch circuit board includes an annular switch contact disposed around the second hole of the switch circuit board. When the keycap is pressed toward the top cover, the keycap squeezes the elastic protrusion to trigger the annular switch contact.

16. The button structure as described in claim 1, characterized in that, The impact post is detachably and fixedly connected to the cap body.

17. The button structure as described in claim 1, characterized in that, The upper cover and the lower cover are fixedly connected.

18. A keyboard, characterized in that, It includes multiple button structures, each button structure being a button structure as described in any one of claims 1 to 17, and multiple upper covers corresponding to the multiple button structures being formed by a single component, and multiple lower covers corresponding to the multiple button structures being formed by a single component.

19. The keyboard as claimed in claim 18, characterized in that, The multiple elastic protrusions corresponding to the multiple button structures are formed by a single component.

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