Setting method for realizing key functions of notebook keyboard on single-layer circuit board

Abstract

The invention relates to the technical field of keyboard keys, in particular to a setting method for realizing a notebook keyboard key function on a single-layer circuit board, which comprises the following steps of: S1, setting a circuit board, and arranging a plurality of contact pads arranged according to keyboard keys on the circuit board; s2, arranging metal elastic sheets on a plurality of contact pads of the circuit board, arranging central contacts for contacting the contact pads right below the metal elastic sheets, and installing key caps above the metal elastic sheets; s3, laying a plurality of rows of row scanning wires connected with the plurality of contact pads on the circuit board, then laying a plurality of columns of column scanning wires which are arranged according to the keyboard keys and are the same as the contact pads, and arranging a keyboard row and column scanning signal interface for connecting a computer system at one end of the circuit board; s4, the bottom surface of the metal elastic sheet is provided with a supporting structure used for enabling the bottom surface of the metal elastic sheet to form jumping or bridging of line scanning routing and column scanning routing, the routing is jumped on the circuit board through the supporting structure, and therefore the key function of the notebook keyboard is achieved on the single-layer circuit board.

Description

Technical Field

[0001] This application relates to the technical field of keyboard keys, and in particular to a method for implementing the functions of notebook keyboard keys on a single-layer circuit board. Background Art

[0002] With the popularization of notebook computers and the increasing demand for thinness, portability, and efficient input experience, keyboard design has become an important part affecting user experience. Traditional notebook computer keyboards use a multi-layer structure, including components such as membrane switches, PCB circuit boards, and scissor feet. This complex structure not only increases the manufacturing cost but also has certain limitations in terms of maintenance and durability. Especially when implementing a high-density key layout and reducing thickness, the existing keyboard designs gradually expose performance bottlenecks.

[0003] In the prior art, two groups of non-connected row lines and column lines are set, and key switches, namely membrane switches and scissor feet, are set at their intersections. When the key is not pressed, the row line and the column line are not connected; when the key is pressed, the row line and the column line are connected. This results in the row line and the column line having to be set in layers to achieve this effect, which also leads to the keyboard needing to adopt a multi-layer structure. Therefore, this application proposes a method for implementing the functions of notebook keyboard keys on a single-layer circuit board. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of this application is to provide a method for implementing the functions of notebook keyboard keys on a single-layer circuit board, which is used to solve the technical problems of the manufacturing cost caused by the multi-layer structure in the prior art and certain limitations in terms of maintenance and durability.

[0005] The above object of this application is achieved through the following technical solutions: A method for implementing the functions of notebook keyboard keys on a single-layer circuit board, including the following steps:

[0006] S1. Set a circuit board and set a plurality of contact pads arranged according to the keyboard keys on the circuit board;

[0007] S2. Set a metal shrapnel on a plurality of contact pads of the circuit board, set a center contact for contacting the contact pad at the center directly below the metal shrapnel, and install a key cap on the upper surface of the metal shrapnel;

[0008] S3. Lay row scan traces with the same number of rows as the plurality of contact pads arranged according to the keyboard keys on the circuit board, then lay column scan traces with the same number of columns as the plurality of contact pads arranged according to the keyboard keys, and set a keyboard row and column scan signal interface for connecting the row scan traces and the column scan traces at one end of the circuit board. The contact pad is connected to the row scan trace, and the keyboard row and column scan signal interface is used for signal interaction with the computer system;

[0009] S4. A support structure is provided on the bottom surface of the metal elastic sheet to form a support for the bottom surface of the metal elastic sheet for jumper or bridging of the row scanning trace and the column scanning trace. The row scanning trace and the column scanning trace form a jumper function on the circuit board to achieve a single-layer trace design.

[0010] Furthermore, the support structure includes a plurality of fixed pins provided on the bottom surface of the metal elastic sheet. The plurality of fixed pins are oppositely arranged, and there is an interval for the row scanning trace and the column scanning trace to jumper or bridge between them. The plurality of fixed pins all extend beyond the edge of the metal elastic sheet, and the column scanning trace is connected to the fixed pins.

[0011] By adopting the above technical solution, when the key is pressed, the center contact will touch the corresponding contact pad on the circuit board. At this time, the row scanning trace connected to the contact pad will detect a signal change. At the same time, the column scanning trace corresponding to the key will also receive a signal through the fixed pins of the metal elastic sheet. In this way, through the combination of row and column scanning, the system can accurately identify the pressed key position from the signals output by the keyboard row and column scanning signal interface. After identifying the key position, the system will transmit the corresponding key signal to the computer for processing, thereby realizing the input function of the keyboard. In this way, the column scanning trace and the row scanning trace can be routed on a single circuit board, so that the computer keyboard does not need to increase the keyboard level due to the routing of the column scanning trace and the row scanning trace, simplifies the circuit layout, reduces the need for interlayer connections, thereby reducing the failure rate and maintenance cost, and directly replaces the scissor mechanism through the setting of the metal elastic sheet, greatly simplifying the keyboard structure. This not only reduces the overall weight of the keyboard, but also reduces the number of parts, improves production efficiency and reliability, and because the metal elastic sheet replaces the scissor mechanism, the keyboard of the present application is also more convenient and fast in the assembly process, reducing production costs and manpower requirements, and the simplified keyboard structure and single-layer trace design make the production process more efficient and standardized, improving the production capacity and product quality of the production line, and because the setting of the metal elastic sheet removes redundant mechanical parts and reduces the friction between parts, the noise generated when the keyboard of the present application is pressed is also greatly reduced, providing a quieter and more comfortable use environment for users.

[0012] Furthermore, a chip package structure is provided on the circuit board to facilitate the connection of the column scanning trace to the fixed pins. The chip package structures are provided in plurality and are evenly distributed on each contact pad.

[0013] Furthermore, the chip package structure includes a plurality of pin pads provided around the contact pad and corresponding to the fixed pins. The pin pads are fixedly connected to the circuit board, and the pin pads are connected to the column scanning trace.

[0014] By adopting the above technical solution, although the setting of the support structure enables the column scanning traces and the row scanning traces to be routed on a single-layer circuit board, the column scanning traces or the row scanning traces connected to the fixed pins need to be soldered to the fixed pins after the metal shrapnel is soldered to the circuit board. This results in the need for an additional soldering step after the metal shrapnel is soldered to the circuit board, making the connection between the fixed pins and the column scanning traces or the row scanning traces, and thus making the processing steps cumbersome and affecting the production efficiency. The setting of the shrapnel packaging structure solves this technical problem. Through the setting of the shrapnel packaging structure, the column scanning traces or the row scanning traces can be directly connected to the pin pads during the initial wiring. In this way, when the metal shrapnel is soldered to the circuit board, only the fixed pins of the metal shrapnel need to be soldered to the pin pads, so that the column scanning traces or the row scanning traces can be connected to the fixed pins, reducing the steps of soldering the column scanning traces or the row scanning traces again, improving the production efficiency, and further enhancing the production capacity and product quality of the production line.

[0015] Further, the circuit board is a flexible circuit board.

[0016] By adopting the above technical solution, the flexible circuit board, due to its good flexibility and bendability, can adapt to the design requirements of various complex shapes and compact spaces, making the routing of the column scanning traces or the row scanning traces more convenient.

[0017] Further, a stainless steel reinforcement sheet is provided on the back of the circuit board wiring layer.

[0018] By adopting the above technical solution, the stainless steel reinforcement sheet provides the necessary strength and hardness for the circuit board, ensuring the stability and durability of the keyboard keys during long-term use, and through cooperation with the flexible circuit board, both the thinness and lightness of the keyboard and its structural strength are ensured.

[0019] Further, the contact pad is connected to the column scanning trace, and the support structure is connected to the row scanning trace.

[0020] By adopting the above technical solution, the circuit board can be adapted to the routing methods of different circuits.

[0021] Further, the metal shrapnel is an arc-shaped housing, and the center contact is provided at the center point of the metal shrapnel.

[0022] By adopting the above technical solution, the arc-shaped housing metal shrapnel provides a stable and consistent pressing feel, enabling the user to obtain good feedback and experience regardless of the pressing force.

[0023] Further, the main manufacturing material of the metal shrapnel is stainless steel.

[0024] By adopting the above technical solution, the stainless - steel property endows the metal shrapnel with good elasticity and durability.

[0025] Further, in the shrapnel encapsulation structure, multiple pin pads are uniformly arranged around the contact pad with the contact pad as the center.

[0026] By adopting the above technical solution, the center of the metal shrapnel welded on the circuit board through the pin pads is aligned with the contact pad, so that the center contact arranged at the center point of the metal shrapnel can accurately contact the contact pad.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Through the setting of the support structure, when the key is pressed, the center contact will contact the corresponding contact pad on the circuit board. At this time, the row - scanning trace connected to the contact pad will detect a signal change. At the same time, the column - scanning trace corresponding to the key will also receive a signal through the fixed pin of the metal shrapnel. In this way, through the combination of row and column scanning, the system can accurately identify the key position pressed from the signal output by the keyboard row - column scanning signal interface. After identifying the key position, the system will transmit the corresponding key signal to the computer for processing, thus realizing the input function of the keyboard. In this way, the row - scanning trace and the column - scanning trace can be routed on a single circuit board, which enables the computer keyboard not to increase the keyboard hierarchy due to the routing of the row - scanning trace and the column - scanning trace, simplifies the circuit layout, reduces the need for inter - layer connections, thereby reducing the failure rate and maintenance cost. And through the setting of the metal shrapnel, the scissor - mechanism is directly replaced, greatly simplifying the keyboard structure. This not only reduces the overall weight of the keyboard, but also reduces the number of parts, improves production efficiency and reliability. And because the metal shrapnel replaces the scissor - mechanism, the keyboard of the present application is also more convenient and fast in the assembly process, reducing production costs and labor requirements. And the simplified keyboard structure and single - layer routing design make the production process more efficient and standardized, improving the production capacity of the production line and product quality. And because the setting of the metal shrapnel removes redundant mechanical parts and reduces the friction between parts, the noise generated when the keyboard of the present application is pressed is also greatly reduced, providing a quieter and more comfortable use environment for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the overall structure schematic diagram in Embodiment 1;

[0030] Figure 2 is the specific structure diagram of the metal shrapnel in Embodiment 1;

[0031] Figure 3 is the schematic diagram of the circuit trace jumper in Embodiment 1;

[0032] Figure 4 It is a schematic diagram of the wire routing and jumper in Embodiment 2.

[0033] Reference numerals: 100, metal shrapnel; 1001, fixed pin; 1002, center contact; 200, circuit board; 2001, shrapnel encapsulation structure; 20011, pin pad; 2002, row scan trace; 2003, column scan trace; 20012, contact pad; 2004, keyboard row and column scan signal interface. Detailed implementation manners

[0034] The following further describes the present application in detail with reference to the accompanying drawings.

[0035] Embodiment 1, referring to Figure 1 、 Figure 2 、 Figure 3 , a setting method for implementing the function of a notebook keyboard key on a single-layer circuit board, including the following steps: S1. Set a circuit board 200 as the base. A plurality of contact pads 20012 are carefully arranged on this circuit board 200. These contact pads 20012 are arranged according to the arrangement of the keyboard keys, ensuring that each contact pad 20012 can correspond to the corresponding keyboard key one by one.

[0036] S2. Above the plurality of contact pads 20012 that have been set, install a metal shrapnel 100. A center contact 1002 is provided at the center position directly below this metal shrapnel 100. The key function of this center contact 1002 is to make contact with the contact pad 20012 on the circuit board 200 when the key is pressed. And on the upper surface of the metal shrapnel 100, a key cap for user operation is installed, and the user performs input operations through this key cap.

[0037] S3. On the circuit board 200, in this embodiment, row scan traces 2002 with the same number of columns as the plurality of contact pads 20012 and column scan traces 2003 with the same number of rows as the plurality of contact pads 20012 are further laid. The row scan traces 2002 and the column scan traces 2003 together constitute the basis for keyboard matrix scanning. At the same time, at one end of the circuit board 200, in this embodiment, a keyboard row and column scan signal interface 2004 that carefully connects the row scan traces 2002 and the column scan traces 2003 is set. The function of this interface is to interact with the computer system to ensure that the input signal of the keyboard can be accurately transmitted to the computer system. It should be noted that the contact pads 20012 are closely connected to the row scan traces 2002, and such a design enables the signal to be transmitted smoothly.

[0038] S4. On the bottom surface of the metal shrapnel 100, a support structure is provided in this embodiment. The main function of this support structure is to enable a channel for the horizontal scanning trace 2002 and the vertical scanning trace 2003 to perform jumper or bridging on the bottom surface of the metal shrapnel 100. Such a setting cleverly realizes the single-layer trace design, greatly simplifying the circuit layout. Specifically, the support structure includes four fixed pins 1001 provided on the bottom surface of the metal shrapnel 100. These four fixed pins 1001 are all oppositely arranged, and there is enough space between them for the horizontal scanning trace 2002 and the vertical scanning trace 2003 to perform jumper or bridging. It is worth mentioning that these four fixed pins 1001 all extend beyond the edge of the metal shrapnel 100, and the vertical scanning trace 2003 is connected to these fixed pins 1001. When the key is pressed, the center contact 1002 will quickly contact the corresponding contact pad 20012 on the circuit board 200. At this time, the horizontal scanning trace 2002 connected to the contact pad 20012 will immediately detect the change in the signal. At the same time, the vertical scanning trace 2003 corresponding to this key will also receive the signal through the fixed pins 1001 of the metal shrapnel 100. Through the combination of row and column scanning, the system can accurately identify the pressed key position from the signals output by the keyboard row and column scanning signal interface 2004. Once the key position is identified, the system will transmit the corresponding key signal to the computer for processing, thereby realizing the input function of the keyboard.

[0039] Such a design enables the vertical scanning trace 2003 and the horizontal scanning trace 2002 to be routed on a single circuit board 200, without the need to increase the keyboard layer due to the routing of the vertical scanning trace 2003 and the horizontal scanning trace 2002. This not only simplifies the circuit layout, reduces the need for interlayer connections, thereby reducing the failure rate and maintenance cost, but also directly replaces the traditional scissor mechanism through the setting of the metal shrapnel 100, greatly simplifying the keyboard structure. Such a design not only reduces the overall weight of the keyboard, but also reduces the number of parts, improving the production efficiency and reliability. At the same time, because the metal shrapnel 100 replaces the scissor mechanism, the keyboard in this embodiment is also more convenient and fast to assemble during the assembly process, reducing the production cost and manpower requirements. In addition, the simplified keyboard structure and single-layer trace design make the production process more efficient and standardized, further improving the production capacity and product quality of the production line. Finally, because the setting of the metal shrapnel 100 removes the redundant mechanical components and reduces the friction between parts, the noise generated when the keys of the keyboard in this application are pressed is also greatly reduced, providing a quieter and more comfortable use environment for users.

[0040] In this embodiment, a curved surface housing is specifically selected for the shape design of the metal shrapnel 100. The central contact 1002 is arranged at the center point of the hemispherical metal shrapnel 100, providing users with a stable and consistent pressing feel. No matter with what force the user presses the keyboard key, the curved surface housing can ensure that the feedback of the key is uniform and comfortable, thus bringing an excellent user experience to the user.

[0041] In addition, the main manufacturing material of the metal shrapnel 100 is selected as stainless steel. Stainless steel endows the metal shrapnel 100 with excellent elasticity and durability due to its unique physical properties. This means that even after long-term use and frequent pressing, the metal shrapnel 100 can still maintain good elasticity and the ability to return to its original state, thus ensuring the stability and durability of the keyboard keys.

[0042] In summary, the metal shrapnel 100 with a curved surface housing and the selection of stainless steel material together constitute the two core advantages of the metal shrapnel 100 in this embodiment. They not only improve the user experience but also ensure the reliability and durability of the keyboard, bringing a better quality and stable input experience to the user.

[0043] Although the setting of the support structure enables the column scan trace 2003 and the row scan trace 2002 to be successfully laid out on the single-layer circuit board 200, however, a challenge encountered in actual operation is that the column scan trace 2003 connected to the fixed pin 1001 must wait until the metal shrapnel 100 has been soldered to the circuit board 200 before the next step of soldering to connect to the fixed pin 1001. This means that after the metal shrapnel 100 is soldered, an additional soldering operation is required to connect the column scan trace 2003 to the fixed pin 1001, which undoubtedly increases the complexity of the production process and restricts the production efficiency.

[0044] To effectively address this technical problem, in this embodiment, a shrapnel encapsulation structure 2001 facilitating the connection of the column scan trace 2003 to the fixed pin 1001 is provided on the circuit board 200. The shrapnel encapsulation structure 2001 not only has a large number but also is evenly distributed around each contact pad 20012, ensuring comprehensive coverage and efficient connection. The core of the shrapnel encapsulation structure 2001 lies in the multiple pin pads 20011 it contains. These pin pads 20011 are arranged around the contact pad 20012 and form a one-to-one correspondence with the fixed pin 1001. The pin pads 20011 are fixedly arranged on the circuit board 200 and are connected to the column scan trace 2003 at the same time.

[0045] Through the provision of the shrapnel packaging structure 2001, an important transformation has been achieved in this embodiment: at the initial stage of the wiring phase, the column scan trace 2003 can be directly connected to the pin pad 20011. In this way, in the subsequent production process, when the metal shrapnel 100 is soldered to the circuit board 200, this embodiment only needs to simply solder the fixed pin 1001 of the metal shrapnel 100 to the pin pad 20011 that has been pre-connected to the column scan trace 2003, and the entire connection process can be easily completed. This design greatly reduces the cumbersome steps of re-soldering the column scan trace 2003 or the row scan trace 2002, significantly improves the production efficiency, and further promotes the capacity improvement of the production line and the optimization of product quality.

[0046] What is more worth mentioning is that the shrapnel packaging structure 2001 in this embodiment is designed extremely precisely. Multiple pin pads 20011 are evenly distributed around the contact pad 20012 with the contact pad 20012 as the center. Such a layout ensures that the center of the metal shrapnel 100 soldered to the circuit board 200 through the pin pads 20011 can be accurately aligned with the contact pad 20012. Therefore, when the metal shrapnel 100 is pressed, the center contact 1002 at its center point can accurately contact the contact pad 20012, thus ensuring the stability and reliability of the keyboard key function. This design not only improves the production efficiency but also ensures the excellent quality of the product.

[0047] In this embodiment, the flexible circuit board 200 is used as the core component of the circuit board 200. With its excellent flexibility and bendability, the flexible circuit board 200 demonstrates an extraordinary adaptability to the design requirements of complex shapes and compact spaces. This characteristic makes the wiring work of the column scan trace 2003 and the row scan trace 2002 unprecedentedly convenient, and designers can more flexibly plan the circuit routes to adapt to various complex and delicate layout requirements.

[0048] Moreover, in order to further enhance the performance of the circuit board 200, a stainless steel reinforcing sheet is provided on the back of the circuit layer of the circuit board 200 in this embodiment. The provision of the stainless steel reinforcing sheet not only provides crucial strength and hardness support for the circuit board 200 but also ensures that the keyboard keys can still maintain excellent stability and durability after long-term and high-frequency use. The introduction of the stainless steel reinforcing sheet undoubtedly provides a solid guarantee for the reliability and service life of the keyboard.

[0049] Meanwhile, the perfect combination of the stainless-steel reinforcement sheet and the flexible printed circuit board 200 achieves a double improvement in the thin and light design and structural strength of the keyboard. It not only meets the pursuit of thin and light portability in modern electronic products but also ensures the durability of the product during actual use. Through this setting, this embodiment successfully achieves a perfect balance between thinness and lightness and structural strength of the keyboard, bringing a better user experience to users.

[0050] Embodiment 2, refer to Figure 4 The difference between this embodiment and Embodiment 1 is that: the contact pad 20012 is connected to the column scan trace 2003, and the support structure is connected to the row scan trace 2002. In this way, when a key is pressed, the central contact 1002 of the metal dome 100 will contact the corresponding contact pad 20012 on the circuit board 200. At this time, the column scan trace 2003 connected to the contact pad 20012 will detect a signal change. At the same time, the row scan trace 2002 corresponding to this key will also receive a signal through the fixed pin 1001 of the metal dome 100. In this way, through the combination of row and column scanning, the system can accurately identify the key position pressed based on the signal output from the keyboard row and column scan signal interface 2004. After identifying the key position, the system will transmit the corresponding key signal to the computer for processing, thereby realizing the input function of the keyboard. In this way, the column scan trace 2003 and the row scan trace 2002 can also be routed on a single circuit board 200, enabling the circuit board 200 to adapt to different circuit routing methods.

[0051] Specific implementation process: When the user presses a certain key on the keyboard, the central contact 1002 of the metal dome 100 will contact the contact pad 20012 on the circuit board 200. At this time, the row scan trace 2002 connected to the contact pad 20012 will detect a signal change. At the same time, the column scan trace 2003 corresponding to this key will also receive a signal through the fixed pin 1001 of the metal dome 100. In this way, through the combination of row and column scanning, the system can accurately identify the key position pressed based on the signal output from the keyboard row and column scan signal interface 2004. After identifying the key position, the system will transmit the corresponding key signal to the computer for processing, thereby realizing the input function of the keyboard.

[0052] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of the application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A method for setting the key functions of a notebook keyboard on a single-layer circuit board, characterized in that: The following steps are involved: S1, providing a circuit board (200), and providing a plurality of contact pads (20012) arranged according to keyboard keys on the circuit board (200); S2, arranging a metal spring (100) on a plurality of contact pads (20012) of a circuit board (200), arranging a central contact (1002) for contacting the contact pad (20012) at the center directly below the metal spring (100), and installing a key cap on the upper surface of the metal spring (100); S3, laying row scanning lines (2002) with the same number of rows as the plurality of contact pads (20012) arranged according to keyboard keys on the circuit board (200), and laying column scanning lines (2003) with the same number of columns as the plurality of contact pads (20012) arranged according to keyboard keys, and providing a keyboard row and column scanning signal interface (2004) at one end of the circuit board (200) for connecting the row scanning lines (2002) and the column scanning lines (2003), wherein the contact pads (20012) are connected to the row scanning lines (2002), and the keyboard row and column scanning signal interface (2004) is used for signal interaction with a computer system; S4. The bottom surface of the metal spring (100) is provided with a support structure for forming a jumper or bridge for the row scanning wiring (2002) and the column scanning wiring (2003) on the bottom surface of the metal spring (100); the row scanning wiring (2002) and the column scanning wiring (2003) form a jumper function on the circuit board (200) through the support structure to realize a single-layer wiring design.

2. According to claim 1, a method for setting the key functions of a laptop keyboard on a single-layer circuit board is characterized in that: The support structure comprises a plurality of fixed pins (1001) arranged on the bottom surface of the metal spring (100); the plurality of fixed pins (1001) are arranged according to actual needs, and intervals are left between them for row scanning lines (2002) and column scanning lines (2003) to jump or bridge; the plurality of fixed pins (1001) extend out of the edge of the metal spring (100); and the column scanning lines (2003) are connected to the fixed pins (1001).

3. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 2, characterized in that: A spring-type packaging structure (2001) is provided on the circuit board (200) to facilitate the connection of the column scanning wiring (2003) to the fixed pin (1001), and a plurality of spring-type packaging structures (2001) are provided and are evenly distributed on each contact pad (20012).

4. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 3, characterized in that: The shrapnel packaging structure (2001) comprises a plurality of pin pads (20011) arranged around the contact pad (20012) and corresponding to the fixed pins (1001), the pin pads (20011) being fixedly connected to the circuit board (200), and the pin pads (20011) being connected to the column scanning wiring (2003).

5. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 1, characterized in that: The circuit board (200) is a flexible circuit board (200).

6. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 1, characterized in that: A stainless steel reinforcing sheet is arranged on the back side of the circuit layer of the circuit board (200).

7. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 1, characterized in that: The contact pad (20012) is connected to the column scan line (2003), and the support structure is connected to the row scan line (2002).

8. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 1, characterized in that: The metal spring (100) is a curved shell, and the central contact (1002) is arranged at the central point of the metal spring (100).

9. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 1, characterized in that: The metal spring (100) is mainly made of stainless steel.

10. A method for setting the key functions of a laptop keyboard on a single-layer circuit board according to claim 4, characterized in that: In the shrapnel packaging structure (2001), a plurality of pin pads (20011) are evenly arranged around the contact pad (20012) with the contact pad (20012) as the center.

Images