A thin mechanical torsion spring magnetic induction key structure

Abstract

The application aims to provide a thin mechanical torsion spring magnetic induction key structure with good sound feedback, adjustable input instruction touch process and thin overall thickness. The key cap, magnet, scissors foot, elastic element, base, Hall IC and circuit board are provided with a boss matched with the elastic element on the bottom surface of the key cap. The elastic element is a double-winding torsion spring. The double-winding torsion spring is arranged on the base and the first force arm is attached to the bottom surface of the key cap. The second force arm of the double-winding torsion spring is located below the boss. The lower end of the boss is provided with an inclined surface matched with the second force arm. When the key cap is pressed downward, the scissors foot is pressed together, the first force arm is attached to the key cap and deformed under force, the second force arm moves along the inclined surface during the downward movement of the boss, the key cap is moved downward to a set height, the second force arm moves upward to pop up and is separated from the restriction of the boss, the scissors foot or the key cap is knocked, and the Hall IC detects the magnetic force of the magnet to trigger the input instruction. The application can be applied to the technical field of keys.

Description

Technical Field

[0001] This invention relates to the technical field of keyboard keys, and in particular to a thin mechanical torsion spring magnetic induction key structure. Background Technology

[0002] Keyboards are a typical input device for electronic products such as computers, laptops, and mobile phones. With the continuous development of information technology, various types of keyboards have emerged.

[0003] Mechanical keyboards are a type of keyboard, and they are widely praised by users, especially gamers, for their advantages of long key lifespan and good tactile feedback. However, the traditional mechanical keyboard switch structure is relatively tall, generally around 18mm, which makes the entire keyboard thicker, inconvenient for users to carry around, resulting in poor portability, and making it even more difficult to use in laptops.

[0004] In addition, traditional mechanical keyboards have a fixed key travel distance when the keys are pressed, which cannot be adjusted according to the user's needs and preferences, thus limiting their usability.

[0005] Patent application CN 110033975 B discloses a button, comprising a bottom plate on which a structural plate is disposed, the structural plate having a through hole; a striking component comprising a shaft, a cantilever, and an elastic element, one end of the shaft being connected to the bottom plate and the other side passing through the through hole, the cantilever extending from one side of the shaft, and one end of the elastic element being connected to the shaft; a button cover covering the structural plate, the end of the elastic element away from the shaft being connected to the button cover, a first pillar and a second pillar extending from the lower side of the button cover, both the first and second pillars passing through the through hole, a first gap space being formed between the bottom ends of the first and second pillars, the first and second pillars being adjacent to each other. A second space is formed on one side of the button cover, which connects to the first space. The first and second spaces are misaligned. The cantilever is located in the first space and can move along the first and second spaces. An elastic member is installed between the button cover and the structural plate. The two sides of the elastic member are connected to the structural plate and the button cover, respectively. When the button cover moves downward, the bottom of the first column presses down against the cantilever and provides a downward force to the cantilever. This causes the cantilever to shake as it moves from the bottom of the first column into the boundary of the second space, striking the second column and producing a knocking sound.

[0006] Although the aforementioned patent can produce a knocking sound when pressed, the sound is produced by the cantilever component shaking and striking the second column. The striking force is relatively small, resulting in minimal sound feedback. This is insufficient for users who seek a better feel. Furthermore, the trigger stroke is fixed, which cannot be adjusted according to user preferences or individual needs, thus affecting the user experience.

[0007] To address the above issues, this application provides a thin mechanical torsion spring magnetic induction key structure that offers good sound feedback, adjustable input command trigger travel, and a thin overall thickness for easy portability or application in laptops. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a thin mechanical torsion spring magnetic induction key structure with good sound feedback, adjustable input command trigger stroke and thin overall thickness, which is easy to carry or can be applied to laptops.

[0009] The technical solution adopted in this invention is as follows: This invention includes a keycap, scissor-switch feet, an elastic element, a base, and a circuit board. The base is disposed on the circuit board. The keycap is hinged to the base via the scissor-switch feet. The elastic element is located between the base and the keycap and provides floating support for the keycap. The bottom surface of the keycap has a boss that mates with the elastic element. A Hall effect IC is disposed on the circuit board. A magnet is disposed at one end of the keycap or the scissor-switch feet near the keycap, and the magnet mates with the Hall effect IC. The elastic element is a double-wound torsion spring, and the double-wound torsion spring is disposed on the base. The first arm of the double-wound torsion spring is in contact with the bottom surface of the keycap, and the second arm of the double-wound torsion spring is located below the boss. The lower end of the boss is set as an inclined surface, and the second arm cooperates with the inclined surface. When the keycap is pressed down, the scissor legs are pressed, the first arm abuts against the keycap and deforms under force, and the second arm moves along the inclined surface during the downward movement of the boss. After the keycap moves down to a set height, the second arm moves away from the restriction of the boss and bounces upward, striking the scissor legs or the keycap. At the same time, the Hall IC detects the magnetic field of the magnet and triggers the input command.

[0010] Furthermore, the scissor-switch mechanism includes an inner support and an outer support. The upper, middle, and lower ends of the inner support are respectively provided with a first keycap shaft, a hinge central shaft, and a torsion spring fixing shaft. The upper and lower ends of the outer support are respectively provided with a base fixing shaft and a second keycap shaft. The inner support is sleeved inside the outer support and is hinged to the outer support through two hinge central shafts. The first keycap shaft and the second keycap shaft cooperate with the keycap. The torsion spring fixing shaft and the base fixing shaft cooperate with the base. The double-wound torsion spring is sleeved on the two torsion spring fixing shafts.

[0011] Furthermore, the bottom surface of the keycap is provided with a rotating latch and a sliding latch on both sides of the left and right ends, respectively. The base is provided with a first limiting latch and a second limiting latch on both sides of the left and right ends, respectively. The two first keycap shafts are rotatably engaged with the two rotating latches. The two torsion spring fixing shafts are engaged with the two second limiting latches. The two base fixing shafts are rotatably engaged with the two first limiting latches. The two second keycap shafts are slidably engaged with the two sliding latches.

[0012] Furthermore, the double-wound torsion spring includes a fixed lever arm, a first lever arm, a second lever arm, a first torsion spring, and a second torsion spring. The two ends of the fixed lever arm are respectively connected to the first torsion spring and the second torsion spring. The first lever arm and the second lever arm are respectively connected to the ends of the first torsion spring and the second torsion spring away from the fixed lever arm. The first torsion spring and the second torsion spring are respectively sleeved on the two torsion spring fixing shafts. The fixed lever arm is located in the clearance hole opened in the base.

[0013] Furthermore, a magnet mounting plate is provided on the inner side of the upper end of the inner bracket, the magnet is mounted on the magnet mounting plate, and a spring guide rib is provided on the side of the magnet mounting plate. The spring guide rib is located below the second lever arm and cooperates with the second lever arm.

[0014] Furthermore, the angles formed between the first lever arm and the second lever arm and the fixed lever arm are both acute angles, and the fixed lever arm is horizontally positioned and attached to the circuit board below.

[0015] Furthermore, the angles formed between the first lever arm and the second lever arm and the fixed lever arm are both obtuse angles. A lever arm buckle is provided at the right end of the base. The fixed lever arm is inclined and its lower end passes through the clearance groove opened on the circuit board. The fixed lever arm cooperates with the lever arm buckle.

[0016] Furthermore, the bottom surface of the keycap is provided with a magnetic fixing rib, which is located on one side of the boss and above the Hall IC.

[0017] Furthermore, a spring clip is provided on the side of the magnet mounting plate, the spring clip being located next to the spring guide rib and cooperating with the second lever arm.

[0018] Furthermore, the Hall IC is disposed at the upper end of the circuit board.

[0019] The beneficial effects of this invention are as follows: This invention uses a double-wound torsion spring as an elastic element. During use, when the keycap is pressed down, the second arm of the double-wound torsion spring is pressed by the boss. Since the lower end of the boss is a slope, the second arm will move along the slope during the pressing process. When the keycap is pressed down to a certain position, the second arm will move out of the lower end of the boss. The boss loses its constraint on the second arm, and under the action of torque, the second arm will quickly bounce upward. At this time, the reaction force of the double-wound torsion spring on the keycap will decrease rapidly, producing a clear tactile feedback. After the second arm bounces upward quickly, it will hit the scissor kick or the keycap, producing a beeping mechanical sound, thus achieving sound feedback. At the same time as the keycap moves downward, the scissor kick will also be pressed down, and the magnet will also move downward. As the distance between the magnet and the Hall IC decreases, the magnetic field detected by the Hall IC will gradually increase. When the change in the magnetic field collected by the Hall IC reaches the set value step range, the input command can be triggered. That is, the user can define the key conduction travel to realize the input of the key function. As can be seen from the above, the sound generation method of the present invention is achieved by the second lever directly striking the scissor feet or keycaps, resulting in good sound feedback and a better user experience. Furthermore, the trigger stroke of the key trigger command is adjustable, allowing users to adjust it according to their preferences or individual needs, thus enhancing the user experience. In addition, the overall structure is thin, making it easy to carry and suitable for use in laptops, demonstrating strong applicability. Attached Figure Description

[0020] Figure 1 This is an exploded view of Embodiment 1 of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the keycap described in Embodiment 1 of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the internal support described in Embodiment 1 of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the external support described in Embodiment 1 of the present invention;

[0024] Figure 5 This is a three-dimensional structural schematic diagram of the elastic element described in Embodiment 1 of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the base described in Embodiment 1 of the present invention;

[0026] Figure 7 This is a front sectional view of the overall structure of Embodiment 1 of the present invention;

[0027] Figure 8 This is a top view of Embodiment 1 of the present invention after the keycaps have been removed;

[0028] Figure 9 This is a schematic diagram of the movement of the second lever arm in Embodiment 1 of the present invention;

[0029] Figure 10 This is a three-dimensional structural schematic diagram of the elastic element described in Embodiment 2 of the present invention;

[0030] Figure 11 This is a cross-sectional view of the overall structure of Embodiment 2 of the present invention;

[0031] Figure 12 This is a three-dimensional structural diagram of the keycap described in Embodiment 3 of the present invention. Detailed Implementation Example 1

[0032] like Figures 1 to 9As shown, in this embodiment, the present invention includes, from top to bottom, a keycap 1, a magnet 8, scissor arms 2, an elastic element 3, a base 4, a Hall effect IC 7, and a circuit board 5. The base 4 is fixed to the circuit board 5, and the Hall effect IC 7 is fixedly mounted on the circuit board 5 and connected to the circuitry on the circuit board 5. The keycap 1 is hinged to the base 4 via the scissor arms 2, so the movement between the keycap 1 and the scissor arms 2 is linked. The elastic element 3 is located between the base 4 and the keycap 1, providing floating support for the keycap 1, allowing the keycap 1 to return to its original position after being pressed during use. A boss 6 is provided on the bottom surface of the keycap 1, which cooperates with the elastic element 3 to press the elastic element 3. The magnet 8 is located at one end of the scissor arms 2 near the keycap 1, and cooperates with the Hall effect IC 7 to provide a magnetic field for the Hall effect IC 7, thereby enabling the Hall effect IC 7 to sense the downward movement of the keycap 1 and trigger an input command based on the downward travel. The elastic element 3 uses a double-wound twisted wire. The spring includes a fixed lever arm 33, a first lever arm 31, a second lever arm 32, a first torsion spring 34, and a second torsion spring 35. The two ends of the fixed lever arm 33 are respectively connected to the first torsion spring 34 and the second torsion spring 35. The first lever arm 31 and the second lever arm 32 are respectively connected to the ends of the first torsion spring 34 and the second torsion spring 35 away from the fixed lever arm 33. The first lever arm 31 is in contact with the bottom surface of the keycap 1 to provide elastic support for the keycap 1. The second lever arm 32 of the double-wound torsion spring is located on the boss 6. Below, the lower end of the boss 6 is set as an inclined surface and cooperates with the second lever arm 32; when the keycap 1 is pressed down, the scissor legs 2 are pressed together, the first lever arm 31 abuts against the keycap 1 and is deformed by force, and the second lever arm 32 moves along the inclined surface during the downward movement of the boss 6. After the keycap 1 moves down to a set height, the second lever arm 32 moves away from the restriction of the boss 6 and bounces upward, striking the scissor legs 2 or the keycap 1. At the same time, the Hall IC7 detects the magnetic field of the magnet 8 and triggers the input command.

[0033] As can be seen from the above, the present invention uses a double-wound torsion spring as the elastic element 3. During use, when the keycap 1 is pressed down, the second lever arm 32 is pressed by the boss 6. Since the lower end of the boss 6 is an inclined surface, the second lever arm 32 will move along the inclined surface during the pressing process. Once the keycap 1 is pressed down to the set position, the second lever arm 32 will move out of the lower end of the boss 6, the boss 6 loses its constraint on the second lever arm 32, and under the torsion of the second torsion spring 35, the second lever arm 32 quickly springs upward. At this time, the reaction force of the first lever arm 31 on the keycap 1 quickly decreases. The lowering of the key will produce a distinct tactile feedback, and the second lever arm 32 will strike the scissor legs 2 or the keycap 1 after a rapid upward movement, producing a "beep" mechanical sound. As the keycap 1 moves downward, the scissor legs 2 will also be pressed down, and the magnet 8 will also move downward. As the distance between the magnet 8 and the Hall IC 7 decreases, the magnetic field detected by the Hall IC 7 gradually strengthens. When the change in the magnetic field collected by the Hall IC 7 reaches the set numerical step range, the input command can be triggered. In actual use, users can set the key travel distance to realize the input of key functions.

[0034] The sound generation method of this invention is achieved by the second lever arm 32 directly striking the scissor feet 2 or the keycap 1. The sound feedback effect is good, providing a better user experience. Furthermore, the trigger stroke of the key trigger command is adjustable, allowing users to adjust it according to their preferences or individual needs, thus enhancing the user experience. In addition, the overall structure is thin, making it easy to carry and suitable for use in laptops, demonstrating excellent applicability.

[0035] The scissor-switch mechanism 2 includes an inner support 21 and an outer support 22. The inner support 21 has a first keycap shaft 211, a hinge shaft 212, and a torsion spring fixing shaft 213 on its upper, middle, and lower ends, respectively. The outer support 22 has a base fixing shaft 221 and a second keycap shaft 222 on its upper and lower ends, respectively. The inner support 21 is fitted inside the outer support 22 and hinged to it via the two hinge shafts 212, allowing for relative rotation. The first keycap shaft 211 and the second keycap shaft 222 cooperate with the keycap 1. The torsion spring fixing shaft 213 and the... The base fixing shaft 221 cooperates with the base 4, thereby connecting the keycap 1, the scissor bracket, and the base 4 to form a cooperative structure. When the keycap 1 is pressed, the inner support 21 and the outer support 22 rotate relative to each other and rotate and slide slightly on the keycap 1 and the base 4, thereby bringing the keycap 1 and the base 4 closer together to perform the pressing action. The double-wound torsion spring is sleeved on the two torsion spring fixing shafts 213, thereby achieving a cooperative fixation. At the same time, it cooperates with the keycap 1 and the circuit board 5 to support the keycap 1, so that the keycap 1 has the ability to return to its original position.

[0036] The keycap 1 has a rotating latch 12 and a sliding latch 13 on its left and right sides respectively on its bottom surface. The base 4 has a first limiting latch 41 and a second limiting latch 42 on its left and right sides respectively. The two first keycap shafts 211 are rotatably engaged with the two rotating latches 12, the two torsion spring fixing shafts 213 are engaged with the two second limiting latches 42, the two base fixing shafts 221 are rotatably engaged with the two first limiting latches 41, and the two second keycap shafts 222 are slidably engaged with the two sliding latches 13. Through the cooperation between the above structures, the inner support 21 and the outer support 22 can smoothly rotate / press during use, avoiding motion interference that would prevent pressing, and enabling the keycap 1 to respond quickly to pressing down and resetting.

[0037] In this embodiment, the double-wound torsion spring includes an integrally formed fixed arm 33, a first arm 31, a second arm 32, a first torsion spring 34, and a second torsion spring 35. The two ends of the fixed arm 33 are respectively connected to the first torsion spring 34 and the second torsion spring 35. The first arm 31 and the second arm 32 are respectively connected to the ends of the first torsion spring 34 and the second torsion spring 35 away from the fixed arm 33. Therefore, the torque of the first arm 31 and the second arm 32 is provided by the first torsion spring 34 and the second torsion spring 35, respectively, while the fixed arm 33 abuts against other components to achieve support, thereby enabling both the first arm 31 and the second arm 32 to obtain torque. The first torsion spring 34 and the second torsion spring 35 are respectively sleeved on the two torsion spring fixing shafts 213. The fixed arm 33 is located in the clearance hole 43 opened in the base 4, so that the fixed arm 33 fits against the end face of the circuit board 5, preventing the double-wound torsion spring from flipping over as a whole. To ensure that the first lever arm 31 fits better against the bottom surface of the keycap 1, the upper end of the first lever arm 31 is also connected to a transverse fitting section that is parallel to and abuts against the bottom surface of the keycap 1.

[0038] The inner support 21 has a cavity in the middle. A magnet mounting plate 214 is provided on the inner side of the upper end of the inner support 21. The magnet 8 is fixed on the magnet mounting plate 214. A spring guide rib 215 is provided on the front side of the magnet mounting plate 214. The end face of the spring guide rib 215 is inclined from the inside to the outside. The spring guide rib 215 is located below the second lever arm 32 and cooperates with the second lever arm 32. When the keycap 1 is pressed down, the boss 6 presses the second lever arm 32 to move downward. Then the second lever arm 32 abuts against the end face of the spring guide rib 215, so that the second lever arm 32 moves forward at the same time as it moves downward, that is, moves along the Y-axis, so that the second lever arm 32 can get away from the restriction of the boss 6, ensuring that the second lever arm 32 can perform a striking action and realize sound feedback.

[0039] like Figure 9As shown, the specific action of the second lever arm 32 is as follows: When the key is pressed, the keycap 1 moves downward. Under the action of the boss 6 and the spring guide rib 215, the second lever arm 32 moves downward and forward at the same time. When the second lever arm 32 moves from point A to point B, the boss 6 loses its constraint on the second lever arm 32. Under the torque of the double-wound torsion spring, the second lever arm 32 quickly moves upward. The reaction force of the double-wound torsion spring on the keycap 1 decreases rapidly, producing a distinct tactile feedback. During the rapid movement of the second lever arm 32 from point B to point C, the second lever arm 32 makes a rapid impact, producing a beeping mechanical sound. When the keycap 1 is released, under the torque of the double-wound torsion spring, the second lever arm 32 returns to its original position and moves from point C to point B to point A under the action of the inclined wall on the boss 6, completing one input action.

[0040] In this embodiment, the included angles formed between the first lever arm 31 and the second lever arm 32 and the fixed lever arm 33 are all acute angles, and the fixed lever arm 33 is horizontally arranged and attached to the circuit board 5 below. The fixed lever arm 33 is in a horizontal state, flat against the upper surface of the circuit board 5, thus using the circuit board 5 as a support surface to prevent flipping. The first lever arm 31 and the second lever arm 32 are inclined relative to the fixed lever arm 33. The angle formed between the first lever arm 31 and the fixed lever arm 33 is denoted as angle α, and the angle formed between the second lever arm 32 and the fixed lever arm 33 is denoted as angle β. At this time, both angle α and angle β are acute angles. When the key is pressed, the keycap 1 moves downward, and the angles α and β gradually decrease. The reaction torque of the torsion spring also gradually increases, thereby increasing the supporting force of the first lever arm 31 on the keycap 1 and increasing the striking force of the second lever arm 32. When the pressure on the keycap 1 is released, under the torque of the double-wound torsion spring, the angles α and β gradually increase and return to their original state, and the entire key structure resets, completing one input.

[0041] In this embodiment, a spring clip 216 is also provided on the side of the magnet mounting plate 214. The spring clip 216 is located beside the spring guide rib 215 and cooperates with the second lever arm 32. The spring clip 216 is located on the front side of the magnet mounting plate 214 and on the right side of the spring guide rib 215. The spring clip 216 is used to cooperate with the second lever arm 32. When the second lever arm 32 is released from the restriction of the boss 6, the second lever arm 32 springs up and strikes the spring clip 216, thereby producing a "beep" mechanical sound to achieve sound feedback. The front end face of the boss 6 is a rearward inclined end face to avoid the upward springing of the second lever arm 32.

[0042] In this embodiment, the Hall IC7 is disposed at the upper end of the circuit board 5. The Hall IC7, fixed to the upper end of the circuit board 5, can sense without penetrating the circuit board 5 when in conjunction with the magnet 8, resulting in more sensitive and unaffected sensing. It should be noted that the Hall IC7 can also be disposed at the lower end of the circuit board 5, or even embedded within the circuit board 5. Example 2

[0043] like Figure 10 and Figure 11 As shown, in this embodiment, the included angles formed between the first lever arm 31 and the second lever arm 32 and the fixed lever arm 33 are all obtuse angles. The right end of the base 4 is provided with a lever arm buckle 44. The fixed lever arm 33 is inclined and its lower end passes through the relief groove 51 opened on the circuit board 5. The fixed lever arm 33 cooperates with the lever arm buckle 44. The first lever arm 31 and the second lever arm 32 are inclined relative to the fixed lever arm 33. The angle formed between the first lever arm 31 and the fixed lever arm 33 is denoted as angle α, and the angle formed between the second lever arm 32 and the fixed lever arm 33 is denoted as angle β. At this time, both angle α and angle β are obtuse angles. When the key is pressed, the keycap 1 moves downward, and the angles α and β gradually decrease. The reaction torque of the torsion spring also gradually increases, thereby increasing the supporting force of the first lever arm 31 on the keycap 1 and increasing the striking force of the second lever arm 32. When the pressure on the keycap 1 is released, under the torque of the double-wound torsion spring, the angles α and β gradually increase and return to their original positions, and the entire key structure resets, completing one input.

[0044] The difference between this embodiment and embodiment one is that the angle formed between the first lever arm 31 and the second lever arm 32 and the fixed lever arm 33 is an obtuse angle, and the fixed lever arm 33 is inclined downward and to the right. Therefore, the clearance groove is opened on the circuit board 5 to avoid structural interference. At the same time, the lever arm buckle 44 is provided at the right end of the base 4 to limit the fixed lever arm 33, so that the double-wound torsion spring will not flip and thus fail to provide floating support. Example 3

[0045] like Figure 12 As shown, in this embodiment, a magnet fixing rib 11 is provided on the bottom surface of the keycap 1. The magnet fixing rib 11 is located on one side of the boss 6 and above the Hall IC 7. The magnet fixing rib 11 is used for mounting the magnet 8, so that the magnet 8 can be positioned directly above the Hall IC 7. Therefore, when the keycap 1 is pressed, the magnet 8 only moves up and down along the Z-axis and will not tilt downward, ensuring the fitting accuracy.

[0046] The difference between this embodiment and Embodiment 1 lies in the installation position of the magnet 8.

[0047] The working principle of this invention is:

[0048] When the input command is pressed, the keycap 1 moves downward. The angles α and β between the first lever arm 31 and the second lever arm 32 and the fixed lever arm 33 gradually decrease, and the reaction torque of the torsion spring gradually increases. Under the action of the boss 6 and the spring guide rib 215, the second lever arm 32 moves downward and forward along the X-axis. When the second lever arm 32 moves from point A to point B, the boss 6 loses its constraint on the second lever arm 32. Under the action of the torque of the double-wound torsion spring, the second lever arm 32 quickly bounces upward. At this time, the reaction force of the double-wound torsion spring on the keycap 1 decreases rapidly, producing a distinct tactile feedback. During the rapid movement of the second lever arm 32 from point B to point C, the second lever arm 32 strikes the spring clip 216 rapidly, producing a beeping mechanical sound.

[0049] As the keycap 1 moves downward, the magnet 8 also moves downward. As the distance between the magnet 8 and the Hall IC 7 decreases, the magnetic field detected by the Hall IC 7 gradually increases. When the magnetic field value set by the Hall IC 7 is reached, the Hall IC 7 immediately provides feedback to input information and realize the input of the key function.

[0050] When the keycap 1 is released, under the torque of the double-wound torsion spring, the angles α and β between the first lever arm 31 and the second lever arm 32 and the fixed lever arm 33 gradually increase, the entire key structure is reset, and one input is completed; the second lever arm 32 is also reset from point C to point B to point A under the action of the inclined surface on the boss 6.

[0051] Although the embodiments of the present invention are described with reference to actual solutions, they do not constitute a limitation on the meaning of the present invention. Modifications to the embodiments and combinations with other solutions based on this specification will be obvious to those skilled in the art.

Claims

1. A thin mechanical torsion spring magnetic induction key structure, comprising a keycap (1), scissor arms (2), an elastic element (3), a base (4), and a circuit board (5), wherein the base (4) is disposed on the circuit board (5), the keycap (1) is hinged to the base (4) via the scissor arms (2), the elastic element (3) is located between the base (4) and the keycap (1) and provides floating support for the keycap (1), and the bottom surface of the keycap (1) is provided with a boss (6) that cooperates with the elastic element (3), characterized in that: Hall IC (7) is provided on the circuit board (5). A magnet (8) is provided at one end of the keycap (1) or the scissor switch (2) near the keycap (1). The magnet (8) cooperates with the Hall IC (7). The elastic element (3) is a double-wound torsion spring. The double-wound torsion spring is provided on the base (4). The first lever arm (31) of the double-wound torsion spring is in contact with the bottom surface of the keycap (1). The second lever arm (32) of the double-wound torsion spring is located below the boss (6). The lower end of the boss (6) is set as an inclined surface. The lever arm (32) cooperates with the inclined surface; when the keycap (1) is pressed down, the scissor legs (2) are pressed together, the first lever arm (31) abuts against the keycap (1) and is deformed by force, the second lever arm (32) moves along the inclined surface during the downward movement of the boss (6), after the keycap (1) moves down to the set height, the second lever arm (32) moves away from the restriction of the boss (6) and bounces upward, striking the scissor legs (2) or the keycap (1), at the same time the Hall IC (7) detects the magnetic field of the magnet (8) and triggers the input command.

2. The thin mechanical torsion spring magnetic induction button structure according to claim 1, characterized in that: The scissor feet (2) include an inner support (21) and an outer support (22). The upper, middle and lower ends of the inner support (21) are respectively provided with a first keycap shaft (211), a hinge central shaft (212) and a torsion spring fixing shaft (213). The upper and lower ends of the outer support (22) are respectively provided with a base fixing shaft (221) and a second keycap shaft (222). The inner support (21) is sleeved in the outer support (22) and is hinged to the outer support (22) through the two hinge central shafts (212). The first keycap shaft (211) and the second keycap shaft (222) cooperate with the keycap (1). The torsion spring fixing shaft (213) and the base fixing shaft (221) cooperate with the base (4). The double-wound torsion spring is sleeved on the two torsion spring fixing shafts (213).

3. The thin mechanical torsion spring magnetic induction button structure according to claim 2, characterized in that: The bottom surface of the keycap (1) is provided with a rotating buckle (12) and a sliding buckle (13) on the left and right sides respectively. The bottom surface of the base (4) is provided with a first limiting buckle (41) and a second limiting buckle (42) on the left and right sides respectively. The two first keycap shafts (211) are rotatably engaged with the two rotating buckles (12). The two torsion spring fixing shafts (213) are engaged with the two second limiting buckles (42). The two base fixing shafts (221) are rotatably engaged with the two first limiting buckles (41). The two second keycap shafts (222) are slidably engaged with the two sliding buckles (13).

4. The thin mechanical torsion spring magnetic induction button structure according to claim 2, characterized in that: The double-wound torsion spring includes a fixed lever arm (33), a first lever arm (31), a second lever arm (32), a first torsion spring (34), and a second torsion spring (35). The two ends of the fixed lever arm (33) are respectively connected to the first torsion spring (34) and the second torsion spring (35). The first lever arm (31) and the second lever arm (32) are respectively connected to the ends of the first torsion spring (34) and the second torsion spring (35) away from the fixed lever arm (33). The first torsion spring (34) and the second torsion spring (35) are respectively sleeved on the two torsion spring fixing shafts (213). The fixed lever arm (33) is located in the clearance hole (43) opened in the base (4).

5. The thin mechanical torsion spring magnetic induction button structure according to claim 2, characterized in that: The inner support (21) is provided with a magnet mounting plate (214) on the inner side of the upper end. The magnet (8) is provided on the magnet mounting plate (214). The side of the magnet mounting plate (214) is provided with a spring guide rib (215). The spring guide rib (215) is located below the second lever arm (32) and cooperates with the second lever arm (32).

6. The thin mechanical torsion spring magnetic induction button structure according to claim 4, characterized in that: The angles formed between the first lever arm (31) and the second lever arm (32) and the fixed lever arm (33) are both acute angles. The fixed lever arm (33) is horizontally positioned and attached to the circuit board (5) below.

7. The thin mechanical torsion spring magnetic induction button structure according to claim 4, characterized in that: The angles formed between the first lever arm (31) and the second lever arm (32) and the fixed lever arm (33) are all obtuse angles. The right end of the base (4) is provided with a lever arm buckle (44). The fixed lever arm (33) is inclined and its lower end passes through the relief groove (51) opened on the circuit board (5). The fixed lever arm (33) cooperates with the lever arm buckle (44).

8. The thin mechanical torsion spring magnetic induction button structure according to claim 2, characterized in that: The bottom surface of the keycap (1) is provided with a magnet fixing rib (11), which is located on one side of the boss (6) and above the Hall IC (7).

9. A thin mechanical torsion spring magnetic induction button structure according to claim 5, characterized in that: The magnet mounting plate (214) is also provided with a spring buckle (216) on its side. The spring buckle (216) is located next to the spring guide rib (215) and cooperates with the second lever arm (32).

10. The thin mechanical torsion spring magnetic induction button structure according to claim 1, characterized in that: The Hall IC (7) is located at the upper end of the circuit board (5).

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