Pressure sensing key and electronic device thereof

Abstract

The utility model relates to a kind of pressure response key and its electronic equipment, when user presses down metal spring, since the bottom edge of metal spring is supported on the upper surface of deformation layer by first contact point, and the lower surface of deformation layer has third contact point closer to the edge of deformation layer, therefore when pressure is conducted to strain layer, deformation layer will bend towards below, deformation sensing unit located in the lower surface of deformation layer can receive deformation signal from deformation layer at this time.The technical scheme disclosed in the application can achieve the function of conventional metal spring switch component and identify the size of pressure.Various combination operation modes such as light press, heavy press, light double-click and long press are realized, which greatly improves the interaction types and modes and enhances the experience.Compared with the prior art, the pressure response key and its electronic equipment disclosed in the application can increase the interaction mode and improve the intelligent degree.

Description

Technical Field

[0001] This utility model relates to the field of pressure button technology, and in particular to a pressure-sensitive button and its electronic device. Background Technology

[0002] Mechanical buttons are the most basic and widely used human-computer interaction components in electronic devices. They achieve signal input through the closing and opening of physical contacts and have the characteristics of simple structure, high reliability, and clear feedback.

[0003] Currently, conventional mechanical buttons use metal spring-loaded button components. These components switch the circuit on and off and generate vibration feedback when a set force is applied. The functions of these components are relatively simple and cannot meet the increasingly diverse interactive requirements. Utility Model Content

[0004] To address the shortcomings of conventional mechanical buttons, which offer limited functionality and fail to meet the increasingly diverse interactive demands, this invention proposes a pressure-sensitive button.

[0005] The technical solution adopted by this utility model is a pressure-sensitive button, including a metal spring. The bottom edge of the metal spring is supported on the upper surface of a deformation layer by a first contact point. A second contact point located directly below the metal spring is connected to the upper surface of the deformation layer. A third contact point located closer to the edge of the deformation layer than the first contact point is connected to the lower surface of the deformation layer. The third contact point is electrically connected to the first and second contact points respectively. The third contact point forms a deformation space located directly below the first contact point. A deformation sensing unit connected to the lower surface of the deformation layer is located within the deformation space.

[0006] In some embodiments, the strain layer has a transmission channel, and the third contact is electrically connected to the first contact and the second contact respectively through the transmission channel.

[0007] In some embodiments, the strain layer is a printed circuit board.

[0008] In some embodiments, the strain layer includes a flexible circuit board and a structural component, with the flexible circuit board fixedly connected to the upper and lower surfaces of the structural component.

[0009] In some embodiments, the third contact is a contact array having multiple contacts, forming a deformation space between the two rows of contact arrays.

[0010] In some embodiments, the first contact is an annular contact, and the second contact is a circular contact located inside the annular contact.

[0011] In some embodiments, a ring-shaped stop is connected to the upper surface of the deformable layer, a metal spring is enclosed within the ring-shaped stop, a thin film is provided above the metal spring, the edge of the thin film is fixedly connected to the ring-shaped stop, and the middle part of the thin film is connected to the metal spring through a contact member.

[0012] In some embodiments, the upper surface of the deformable layer and the circular stop are sealed together, and the edge of the film is sealed together with the circular stop.

[0013] In some embodiments, the deformation sensing unit includes four strain sensing resistors connected to form a Wheatstone bridge.

[0014] To address the shortcomings of conventional electronic devices where mechanical buttons offer limited functionality and fail to meet the increasingly diverse interactive demands, this invention proposes an electronic device.

[0015] The technical solution adopted in this utility model is an electronic device, including the aforementioned pressure-sensitive button.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This application discloses a pressure-sensitive button. When a user initially presses down on the metal spring, the bottom edge of the metal spring is supported on the upper surface of the deformation layer by a first contact point. The lower surface of the deformation layer has a third contact point closer to its edge. Therefore, when pressure is transmitted to the deformation layer, it bends downwards. At this time, the deformation sensing unit located on the lower surface of the deformation layer can receive the deformation signal from the deformation layer. As the user further presses down on the metal spring, it contacts the second contact point located directly below it. Since the third contact point is electrically connected to both the first and second contacts, it can determine whether the switch has been successfully triggered. Furthermore, the pressure applied to the upper surface of the deformation layer now includes a second contact point in addition to the first contact point. Under this force application, the deformation layer also bends in the same direction, and the deformation sensing unit can detect the deformation signal and output pressure information. The technical solution disclosed in this application can achieve both the function of a conventional metal spring switch component and the ability to identify the magnitude of the pressure. This invention enables various combinations of operations such as light press, heavy press, double press, and long press, significantly increasing the types and methods of interaction and enhancing the user experience. Compared with existing technologies, the pressure-sensitive button and its electronic device disclosed in this application can achieve the goal of increasing interaction methods and improving the level of intelligence. Attached Figure Description

[0018] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0019] Figure 1A schematic diagram of a pressure-sensitive button according to an embodiment of the present invention is shown;

[0020] Figure 2 It shows according to Figure 1 A schematic diagram of the deformation layer in a pressure-sensitive button is provided.

[0021] Figure 3 It shows according to Figure 2 A top view of a deformation layer in a pressure-sensitive button;

[0022] Figure 4 It shows according to Figure 2 The provided top view shows a ring-shaped stopper mounted on the upper surface of the deformable layer;

[0023] Figure 5 It shows according to Figure 2 A bottom view of the deformation layer in a pressure-sensitive button;

[0024] Figure 6 It shows according to Figure 5 A bottom view showing a deformation sensing unit mounted on the lower surface of the deformation layer;

[0025] Figure 7 A circuit connection diagram of a deformation sensing unit in a pressure-sensitive button according to an embodiment of the present invention is shown.

[0026] Figure 8 A schematic diagram of the strain layer in a pressure-sensitive button according to an embodiment of the present invention is shown.

[0027] Figure 9 A schematic diagram of the strain layer transmission channel in a pressure-sensitive button according to an embodiment of the present invention is shown.

[0028] Figure 10 A top view of the strain layer is shown in another embodiment of a pressure-sensitive button provided according to an embodiment of the present invention;

[0029] Figure 11 It shows according to Figure 10 A bottom view of the strain layer in a pressure-sensitive button;

[0030] Figure 12 It shows according to Figure 10 A cross-sectional view of the strain layer in a pressure-sensitive button, cut along section line AA;

[0031] Figure 13 It shows according to Figure 10 A sectional view of a pressure-sensitive button taken along section line AA is provided.

[0032] Figure 14 It shows according to Figure 10 A cross-sectional view of a pressure-sensitive button taken along section line BB is provided.

[0033] Label Explanation:

[0034] 10. Metal shrapnel;

[0035] 20. Deformation layer; 21. First contact; 22. Second contact; 23. Third contact; 24. Transmission channel; 25. Flexible circuit board; 26. Structural component;

[0036] 30. Deformation sensing unit;

[0037] 40. Circular stop block;

[0038] 50. Film;

[0039] 60. Contact components. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] This utility model discloses a pressure-sensitive button; please refer to it. Figures 1 to 5 The device includes a metal spring 10, the bottom edge of which is supported on the upper surface of the deformation layer 20 by a first contact 21. The upper surface of the deformation layer 20 is connected to a second contact 22 located directly below the metal spring 10. The lower surface of the deformation layer 20 is connected to a third contact 3 located closer to the edge of the deformation layer 20 than the first contact 21. The third contact 3 is electrically connected to the first contact 21 and the second contact 22 respectively. The third contact 3 forms a deformation space located directly below the first contact 21. Within the deformation space, there is a deformation sensing unit 30 connected to the lower surface of the deformation layer 20.

[0042] When the user initially presses down on the metal spring 10, the bottom edge of the metal spring 10 is supported on the upper surface of the deformation layer 20 by the first contact 21, and the lower surface of the deformation layer 20 has a third contact 3 closer to the edge of the deformation layer 20. Therefore, when the pressure is transmitted to the deformation layer, the deformation layer 20 will bend downwards. At this time, the deformation sensing unit 30 located on the lower surface of the deformation layer 20 can receive the deformation signal from the deformation layer 20. As the user further presses down on the metal spring 10, the metal spring 10 can contact the second contact 22 located directly below the metal spring 10. Since the third contact 3 is electrically connected to the first contact 21 and the second contact 22 respectively, it can be determined whether the switch is successfully triggered. At this time, the pressure applied to the upper surface of the deformation layer 20 also includes the second contact 22 in addition to the first contact 21. Under this force application method, the deformation layer 20 will also bend in the same direction, and the deformation sensing unit 30 can also detect the deformation signal and output pressure information. The technical solution disclosed in this application can achieve both the functions of a conventional metal spring switch and the ability to identify the magnitude of pressure. It enables various combinations of operations such as light press, heavy press, double-tap, and long press, significantly increasing the types and methods of interaction and enhancing the user experience. Compared with existing technologies, the pressure-sensitive button and its electronic device disclosed in this application can achieve the goal of increasing interaction methods and improving the level of intelligence.

[0043] Specifically, the deformation sensing unit 30's recognition of the deformation of the deformation layer 20 can be divided into two stages: a first stage before the metal spring 10 touches the second contact 22, and a second stage after the metal spring 10 touches the second contact 22. In the first and second stages, the pressure applied to the upper surface of the deformation layer 20 differs, resulting in differences in the deformation recognition by the deformation sensing unit 30. In the second stage, the deformation sensing unit 30 also outputs a linearly changing voltage signal after recognizing the deformation; however, the linear correlation ratio of the deformation of the deformation layer 20 with the user's pressure changes differs between the first and second stages. To effectively detect the magnitude of the user's applied pressure, one approach is to determine whether the metal spring 10 is conductive with the second contact 22, and another is to analyze the pressure changes output by the deformation sensing unit 30. Therefore, the magnitude of the user's applied pressure can be effectively detected in both the first and second stages.

[0044] The deformation space serves two purposes: firstly, it provides space for the pressure sensing unit, and secondly, it allows the deformation layer 20 to deform, ensuring that the deformation of the deformation layer 20 is not hindered by other structures.

[0045] It should be noted that this application does not limit the shape and number of the first contact 21, but only requires that the first contact 21 can provide support for the metal spring 10, so as to provide support for it when the metal spring 10 is pressed down. In other embodiments, the first contact 21 can be two contacts, and the shape of the contacts can be circular, strip-shaped, etc., with the two contacts respectively located on both sides of the second contact 22. The first contact 21 can also be annular, arc-shaped, parabolic, etc. In addition, other structures used to support the metal spring 10 can also be considered as the first contact 21 mentioned in this application, and this application does not require that all first contacts 21 be electrically connected to the third contact 3.

[0046] In some particularly specific embodiments, such as Figure 2 As shown, this figure is a side cross-sectional view of a printed circuit board. The first contact 21, the second contact 22, and the third contact 3 are made of copper. Etched copper lines are present on the upper and lower surfaces of the printed circuit board, selectively conducting within the board. One design of the copper lines on the upper and lower surfaces is as follows... Figure 3 and Figure 5 As shown, the upper copper surface is used to contact the metal spring 10, and the lower copper surface is used for soldering with solder paste to the required equipment for circuit connection and mechanical support. Printed circuit boards can also be achieved using other methods, such as flexible circuit boards with structural components, or by injection molding copper and plastic directly.

[0047] When processing a printed circuit board, a circular stop 40 is attached to its upper surface, such as... Figure 1 and Figure 4 As shown, the purpose of the circular stop 40 is to restrict the movement of the internal metal spring 10 and prevent it from falling out. Of course, the circular stop 40 is not necessary. For example, a similar groove can be machined during the manufacturing of the printed circuit board to achieve the same function, or it can be achieved in other ways.

[0048] Then, a metal spring 10 is placed inside the circular stop 40, with the bottom of the circular metal spring 10 contacting the outer ring copper on the upper surface of the printed circuit board, while the upper part of the metal spring 10 is higher than the copper on the upper surface of the printed circuit board and does not contact the copper at the center of the upper surface of the printed circuit board. When the metal spring 10 is pressed, when it undergoes sufficient deformation, the center of the metal spring 10 will bend down and contact the copper at the center of the upper surface of the printed circuit board, thereby achieving electrical conduction between the outer ring copper and the center copper on the upper surface of the printed circuit board. Due to the selective conduction connection of the upper and lower copper on the printed circuit board, the specific conduction method varies. Figure 2 Other references Figure 9 and Figure 12 ,in Figure 12It is a stepped transmission channel that can be connected to external circuits through the copper on the bottom of the printed circuit board, and finally converts the pressing event into an electrical signal output.

[0049] Then, a contact element 60 and a thin film 50 are set at the top center of the metal spring 10. The contact element 60 is fixedly connected to the thin film 50 and contacts the metal spring 10. The purpose of the contact element 60 is to fix parameters such as the position and area of ​​the force applied to the metal spring 10 when pressed, thereby improving the stability of the deformation of the metal spring 10 under force and the vibration stability generated by the deformation of the metal spring 10, which is reflected in the feel when pressing. The thin film 50 is fixedly connected to the circular stop 40 around its perimeter. The purpose is twofold: first, to confine the metal spring 10 inside, reduce shaking, and prevent it from falling out; second, to provide waterproofing.

[0050] like Figure 6 As shown, deformation sensing resistors are also provided at the bottom of the printed circuit board. Preferably, four resistors are provided, arranged in a two-horizontal-two-vertical configuration, forming a Wheatstone bridge. The specific configuration and circuit connection are as follows. Figure 6 and Figure 7 As shown, when a force is applied to the top of the device, the force is transmitted through the metal spring 10 to the outer ring of copper on the upper surface of the printed circuit board. This outer ring then applies downward pressure to the printed circuit board. Since the copper on the bottom of the printed circuit board is further outward than the outer ring of copper on the upper surface, the printed circuit board will bend under this force application, causing the four deformation sensing resistors to be stretched and resulting in a change in resistance. Due to the different horizontal and vertical arrangements of the resistors, the resistance change is larger when stretched along the long direction and smaller when stretched along the short direction. Since the force application method mainly involves horizontal stretching of the bottom surface of the printed circuit board as shown in the diagram, the resistance changes of R2 and R3 will be relatively large, while the changes of R1 and R4 will be relatively small. Corresponding to the resistance settings of the Wheatstone bridge, a corresponding voltage signal will be output. Furthermore, the voltage output will increase linearly with the increase in force. When the metal spring 10 undergoes abrupt deformation, the contact point between the metal spring 10 and the surface of the printed circuit board becomes such that both the outer copper ring and the central copper ring on the surface of the printed circuit board are in contact, and force is applied. This force application will also cause the printed circuit board to bend in the same pattern, and will also output a voltage signal that changes linearly with pressure. However, the correlation ratio of this linear relationship is different before and after the abrupt deformation of the metal spring 10. This can be determined by whether the metal spring 10 is conducting. Therefore, the pressure magnitude can be effectively detected both before and after the abrupt deformation of the metal spring 10.

[0051] In another particularly specific embodiment, please refer to Figures 10 to 14The first contact 21 is a ring-shaped rounded rectangle with a notch. The second contact 22 is elongated, extending from the notch into the interior of the ring-shaped rounded rectangle. Please refer to [reference needed for specific shapes]. Figure 10 The third contact point is shaped like a two-row contact array, with a deformation space between the two rows. At least one contact in each row extends into this deformation space, thus being located directly below the first and second contacts. This minimizes the distance of the transmission channel 24. Please refer to [reference needed]. Figures 11 to 13 .

[0052] also, Figure 13 This is a cross-sectional view taken from section line AA. At the position of section line AA, the metal spring 10 does not come into contact with the first contact and the second contact. Figure 14 The cross-sectional view is taken from section line BB, where the metal spring 10 only contacts the first contact point. That is, when the metal spring is pressed down to the second stage, the metal spring will contact at least the second contact point at section line AA.

[0053] In some embodiments, the metal spring 10 is a dome switch, which contacts the second contact 22 precisely when a sudden change occurs. When the dome switch is a metal spring 10, it can emit an audible signal during the sudden change, allowing the user to determine that pressure recognition has entered the second stage. This also provides better pressure feedback to the user.

[0054] In some embodiments, please refer to Figure 1 and Figure 2 The strain layer has a transmission channel 24, and the third contact 3 is electrically connected to the first contact 21 and the second contact 22 through the transmission channel 24.

[0055] By incorporating the transmission channel 24 within the strain layer, the need for flexible circuits or connecting wires can be avoided. Furthermore, the transmission channel 24 within the strain layer can be adaptively adjusted according to the specific location of the contacts without affecting the external structure, thus saving valuable space and reducing interlayer thickness. In addition, since the transmission channel 24 is located on the strain layer, it can be sealed during electrical connections, preventing the risk of exposed wiring outside the strain layer. This also ensures a reliable electrical connection, preventing poor contact.

[0056] In some embodiments, the strain layer is a printed circuit board.

[0057] When the pressure-sensitive button is integrated into a printed circuit board, in addition to facilitating the electrical connection of the third contact 3 to the first contact 21 and the second contact 22 via the transmission channel 24, other electronic components can also be integrated on the printed circuit board to achieve more functions. This allows the printed circuit board to not only serve as a carrier for electronic components but also as a structural component capable of deformation. When pressure-sensitive buttons are incorporated into electronic devices, the number of circuit boards required can be reduced to some extent, thereby decreasing the size and volume of the electronic device.

[0058] In some embodiments, please refer to Figure 8 The strain layer includes a flexible circuit board 25 and a structural component 26, with the flexible circuit board 25 fixedly connected to the upper and lower surfaces of the structural component 26.

[0059] Specifically, designing the strain layer as a composite structure of flexible circuit board and structural components offers a core advantage through deep synergy between flexible electronics and mechanical structures. The structural components, acting as the mechanical load-bearing body, provide resistance to bending, impact, and deformation. These components can be made from materials such as titanium alloys and carbon fiber composites. The structural components can be made from suitable materials for different application scenarios, achieving better adaptability. The flexible circuit board and structural components can be fixed together by adhesive bonding, and the bonding strength can be enhanced through surface structures (such as grooves and protrusions).

[0060] In some embodiments, please refer to Figure 5 and Figure 6 The third contact 3 is a contact array with multiple contacts, forming a deformation space between the two rows of contact arrays.

[0061] It should be noted that the contact array can adapt to the electronic control needs of more scenarios. For example, light-emitting units and sound-emitting units that work together with the collected pressure signals can be added. On the other hand, the arrangement of two rows of contact arrays can provide good support for pressure-sensitive buttons.

[0062] In some embodiments, please refer to Figure 3 and Figure 4 The first contact 21 is an annular contact, and the second contact 22 is a circular contact, with the circular contact located inside the annular contact.

[0063] The annular contact provides good support for the metal spring 10 and provides more uniform downward pressure when the user presses down, so that the strain layer undergoes uniform deformation and the deformation sensing unit 30 outputs a higher quality pressure signal.

[0064] In some embodiments, please refer to Figure 1 and Figure 4A ring-shaped stop 40 is connected to the upper surface of the deformable layer 20. The metal spring 10 is enclosed in the ring-shaped stop 40. A thin film 50 is provided above the metal spring 10. The edge of the thin film 50 is fixedly connected to the ring-shaped stop 40. The middle part of the thin film 50 is connected to the metal spring 10 through a contact member 60.

[0065] The circular stop 40 and the diaphragm 50 protect the metal spring 10, the first contact 21, and the second contact 22 from direct damage caused by external impacts. The circular stop 40 provides a clear boundary and positioning for the metal spring 10, ensuring its stable placement on the deformation layer 20 and preventing displacement or wobbling. The fixed connection between the edge of the diaphragm 50 and the circular stop 40 further enhances the stability of the entire structure, ensuring the relative positions of the components are fixed and preventing the structure from loosening or being damaged under external forces. Furthermore, the diaphragm 50 is connected to the metal spring 10 via a contact 60 in the middle, allowing for more precise control over the deformation of the metal spring 10. When external pressure is applied to the diaphragm 50, the pressure is transmitted to the metal spring 10 through the contact 60, causing the metal spring 10 to deform in a predetermined manner, thereby achieving a specific function. Furthermore, the flexible properties of the film 50 enable it to respond quickly to changes in external pressure and accurately transmit the pressure to the metal spring 10.

[0066] In some embodiments, please refer to Figure 1 The upper surface of the deformable layer 20 is sealed to the circular stop 40, and the edge of the film 50 is sealed to the circular stop 40.

[0067] The sealed connection creates a relatively enclosed space, isolating key components such as the metal spring 10 from the external environment. Dust, fine particles, and other impurities cannot enter this enclosed area, preventing problems such as poor contact and accelerated wear caused by dust accumulation in the metal spring 10. Simultaneously, the sealed structure prevents moisture penetration, ensuring that even in humid environments, after splashing, or during brief immersion in water, the internal critical components remain unaffected. This broadens the application scenarios and improves the reliability of the pressure-sensitive button. Furthermore, the sealed protection of the internal components facilitates cleaning and maintenance of the pressure-sensitive button.

[0068] In some embodiments, please refer to Figure 6 and Figure 7 The deformation sensing unit 30 includes four strain sensing resistors, which are connected to form a Wheatstone bridge.

[0069] To address the shortcomings of conventional electronic devices where mechanical buttons offer limited functionality and fail to meet the increasingly diverse interactive demands, this invention proposes an electronic device.

[0070] The technical solution adopted in this utility model is an electronic device, including the aforementioned pressure-sensitive button.

[0071] In the description of this specification, the terms "Embodiment 1," "this embodiment," or "in one embodiment," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention or utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example; moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in one or more embodiments or examples.

[0072] In the description of this specification, the terms "connection," "installation," "fixing," "setting," and "having" are interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0073] In the description of this specification, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] The above description of the embodiments is intended to enable those skilled in the art to understand and apply the technology of this invention. Those skilled in the art can readily make various modifications to these examples and apply the general principles described herein to other embodiments without creative effort. Therefore, this invention is not limited to the above embodiments. Modifications in the following situations should be within the scope of protection of this invention: ① New technical solutions implemented based on the technical solution of this utility model and combined with existing common knowledge, where the technical effects of the new technical solution do not exceed the technical effects of this utility model; ② Equivalent substitutions of some features of the technical solution of this utility model using known technology, resulting in the same technical effects as those of this utility model; ③ Extendable technical solutions based on the technical solution of this utility model, where the substantive content of the extended technical solution does not exceed the technical solution of this utility model; ④ Equivalent transformations made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields.

Claims

1. A pressure sensitive key, characterized by, The device includes a metal spring, the bottom edge of which is supported on the upper surface of a deformation layer by a first contact. The upper surface of the deformation layer is connected to a second contact located directly below the metal spring. The lower surface of the deformation layer is connected to a third contact located closer to the edge of the deformation layer than the first contact. The third contact is electrically connected to both the first and second contacts. The third contact forms a deformation space located directly below the first contact. Within the deformation space, a deformation sensing unit is connected to the lower surface of the deformation layer.

2. The pressure-sensitive button according to claim 1, characterized in that, The strain layer has a transmission channel, and the third contact is electrically connected to the first contact and the second contact respectively through the transmission channel.

3. The pressure-sensitive key of claim 1, wherein The strain layer is a printed circuit board.

4. The pressure-sensitive key of claim 1, wherein The strain layer includes a flexible circuit board and a structural component, with the flexible circuit board fixedly connected to the upper and lower surfaces of the structural component.

5. The pressure-sensitive key of claim 1, wherein, The third contact is a contact array with multiple contacts, forming the deformation space between the two rows of the contact array.

6. The pressure-sensitive key of claim 1, wherein The first contact is an annular contact, and the second contact is a circular contact, with the circular contact located inside the annular contact.

7. The pressure-sensitive key according to any one of claims 1 to 6, wherein A ring-shaped stop is connected to the upper surface of the deformation layer. The metal spring is surrounded within the ring-shaped stop. A thin film is provided above the metal spring. The edge of the thin film is fixedly connected to the ring-shaped stop. The middle part of the thin film is connected to the metal spring through a contact element.

8. The pressure-sensitive key of claim 7, wherein, The upper surface of the deformable layer is sealed to the circular stop, and the edge of the film is sealed to the circular stop.

9. The pressure-sensitive key according to any one of claims 1 to 6, wherein The deformation sensing unit includes four strain sensing resistors, which are connected to form a Wheatstone bridge.

10. An electronic device, comprising: Includes the pressure-sensitive button as described in any one of claims 1 to 9.

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