Magnetic trigger structure of key
By adopting a magnetic trigger structure in the button device and using magnetic attraction to achieve conduction and disconnection, the problems of mechanical wear, electrical leakage and magnetic components are easily disturbed, and the service life and reliability are improved.
Patent Information
- Application Number
- CN202421910199.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-07
AI Technical Summary
Existing key equipment has problems such as mechanical wear, electrical leakage and magnetically sensitive components being susceptible to external magnetic field interference, resulting in short service life and low reliability.
Using a magnetic trigger structure, through the magnetic attraction between the first magnetic element, the second magnetic element and the third magnetic element, conduction and disconnection are achieved in the air to avoid mechanical contact and electromagnetic interference.
It effectively avoids mechanical wear and electricity leakage, improves service life, is not susceptible to external magnetic field interference, and improves reliability.
Smart Images
Figure CN222952955U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of key equipment, and more specifically to the technical field of magnetic trigger structures of keys. Background Art
[0002] Keys are the most commonly used and most important input devices in electronic systems. They transmit pressure to make the key contacts conductive or disconnected. Existing keys are divided into mechanical keys, magnetic axis keys, and electromagnetic keys.
[0003] Currently, most of the buttons use mechanical switch tube contact to achieve feel and conduction, and use elastic elements to provide rebound elasticity. The service life is affected by mechanical fatigue and has a short service life. In addition, mechanical buttons are prone to electrical leakage because the buttons touch the conductive terminals. Magnetic axis buttons mainly rely on Hall elements to detect the button status. This magnetic sensitive element is easily disturbed by external magnetic fields in complex application environments, affecting the accuracy and reliability of button triggering. Electromagnetic buttons use current to adjust the direction and size of the magnetic field. This structure is complex and costly. Utility Model Content
[0004] The purpose of the utility model is to solve the above technical problems and provide a magnetic trigger structure for a key. The key is turned on and off by magnetic force in the air, which effectively avoids electrical leakage, mechanical wear and tear, and prolongs the service life.
[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:
[0006] The utility model provides a magnetic trigger structure of a key, comprising a key housing, a first magnetic element, a second magnetic element, a third magnetic element, a conductive terminal, a conductive layer and an insulating layer;
[0007] The first magnetic element, the second magnetic element, and the third magnetic element are arranged in sequence from top to bottom in the button housing, and the three magnetic directions are the same and attract each other;
[0008] The conductive terminal is fixed in the key housing between the first magnetic element and the second magnetic element; an insulating layer and a conductive layer are sequentially attached to the upper surface of the second magnetic element, and a movable gap for the second magnetic element to move up and down is provided inside the key housing below the conductive terminal;
[0009] A limiting structure for limiting the displacement lower line of the second magnetic element is arranged below the movable gap, and the limiting structure is fixed in the button housing above the third magnetic element;
[0010] It also includes a driving mechanism that drives the first magnetic element or the third magnetic element to move up and down to drive the second magnetic element to move up and down in the active gap. The second magnetic element moves up and down in the active gap to achieve conduction or disconnection between the conductive layer and the conductive terminal.
[0011] Specifically, the third magnetic element is located below the second magnetic element. In a natural state, the second magnetic element is attracted by the third magnetic element and moves closer to the third magnetic element until it is limited by the limiting structure in the button housing.
[0012] This scheme includes two driving forms. The first driving form is: the first magnetic element moves up and down, so that the second magnetic element moves up and down in the active gap, thereby realizing the conduction or disconnection between the conductive layer and the conductive terminal; the second driving form is: the third magnetic element moves up and down, so that the second magnetic element moves up and down in the active gap, thereby realizing the conduction or disconnection between the conductive layer and the conductive terminal.
[0013] In detail, when the button is pressed, the distance between the first magnetic element and the second magnetic element or the distance between the second magnetic element and the third magnetic element will change, thereby changing the force condition of the second magnetic element, causing the second magnetic element to drive the conductive layer and the insulating layer to move toward the first magnetic element, and finally the conductive layer contacts the conductive terminal and connects the circuit.
[0014] In one embodiment, the height of the active gap is greater than the sum of the thicknesses of the second magnetic element, the insulating layer, and the conductive layer. The active gap is a space that provides the second magnetic element with a space for translation up and down.
[0015] In one embodiment, the key housing includes a key inner shell and an upper shell fixedly sleeved on the top of the key inner shell, the driving mechanism is an upper key mechanism that drives the first magnetic element to move up and down, the upper key mechanism includes a key cap movably sleeved on the top of the upper shell and a compression spring, the key cap is partially located in the upper shell, the compression spring is fixed between the key cap and the conductive terminal, and the first magnetic element is fixed to the bottom of the key cap in the upper shell;
[0016] The second magnetic element, the third magnetic element, the conductive terminal, the conductive layer and the insulating layer are all located inside the key inner shell.
[0017] Specifically, when the upper part of the key is pressed, the key cap drives the first magnetic element close to the second magnetic element, the compression spring is in a compressed state, and the distance between the first magnetic element and the second magnetic element is reduced, thereby changing the force condition of the second magnetic element, causing the second magnetic element to move upward and close to the conductive terminal, and the conductive layer and the conductive terminal conduct the circuit.
[0018] When the upper part of the key recovers, the first magnetic element moves away from the second magnetic element under the action of the compression spring, and the distance between the first magnetic element and the second magnetic element increases, thereby changing the force condition of the second magnetic element, causing the second magnetic element to move downward away from the conductive terminal, disconnecting the conductive layer from the conductive terminal, and breaking the circuit.
[0019] In one embodiment, the compression spring may be replaced with a resilient flexible material.
[0020] Specifically, the compression spring can be replaced by a flexible material with elastic force, and the choice of the flexible material is not limited.
[0021] In one embodiment, a shock absorbing layer is further included, and the shock absorbing layer is located in the key inner shell between the first magnetic element and the second magnetic element, and the conductive terminal is tightly attached to the lower part of the shock absorbing layer.
[0022] Specifically, the shock-absorbing layer can be made of different materials and shapes and ultimately achieve the purpose of limiting the movement of the second magnetic element.
[0023] In one embodiment, it also includes a lower upper sealing plate and a lower lower sealing plate, the shock absorbing layer is fixed to the bottom of the lower upper sealing plate, the lower lower sealing plate is fixed to the bottom of the key inner shell, the lower upper sealing plate is fixed to the top of the key inner shell, and the third magnetic element is fixed to the lower lower sealing plate.
[0024] In one embodiment, the first magnetic element, the second magnetic element, and the third magnetic element are all made of a material selected from the group consisting of magnet, neodymium iron boron, and oxide.
[0025] Specifically, under the premise of satisfying the force-bearing process, the first magnetic element, the second magnetic element and the third magnetic element can be made of a variety of different magnetic materials, including but not limited to magnets, neodymium iron boron and ferrite.
[0026] In addition, the sizes of the first magnetic element, the second magnetic element and the third magnetic element can be enlarged or reduced according to the application scenario and the manufacturing process.
[0027] In one embodiment, the key housing includes a key fixed inner shell and a key sliding outer shell slidably sleeved on the outer side of the key fixed inner shell, the driving mechanism is a lower key mechanism that drives the third magnetic element to move up and down, the lower key mechanism includes an external upper sealing plate arranged on the top of the key sliding outer shell, and an external lower sealing plate arranged on the bottom of the key sliding outer shell, two fixed guide blocks are symmetrically arranged on the key fixed inner shell, two guide grooves respectively matched with corresponding fixed guide blocks are symmetrically arranged on the key sliding outer shell along the axial direction, and the third magnetic element is fixed on the external lower sealing plate;
[0028] The first magnetic element, the second magnetic element, the conductive terminal, the conductive layer and the insulating layer are all located inside the key fixing inner shell.
[0029] In one embodiment, an internal upper sealing plate is fixedly provided on the top of the button-fixing inner shell, and an internal lower sealing plate is fixedly provided on the bottom of the button-fixing inner shell.
[0030] In one embodiment, the first magnetic element is fixedly arranged on the lower side of the internal upper sealing plate, and also includes a shock-absorbing layer, which is arranged below the first magnetic element. The conductive terminal is tightly attached to the lower part of the shock-absorbing layer, and the second magnetic element is movably arranged between the internal lower sealing plate and the conductive terminal.
[0031] Specifically, when the button is pressed and the housing is slid, the third magnetic element moves away from the second magnetic element, and the distance between the third magnetic element and the second magnetic element increases, thereby changing the force applied to the second magnetic element, causing the second magnetic element to move upward and close to the conductive terminal, so that the conductive layer touches the conductive terminal and connects the circuit.
[0032] When the button sliding housing is released from being pressed, the third magnetic element moves towards the second magnetic element under the suction of the second magnetic element, and the distance between the third magnetic element and the second magnetic element decreases, thereby changing the force applied to the second magnetic element, causing the second magnetic element to move downward away from the conductive terminal, thereby disconnecting the conductive layer from the conductive terminal.
[0033] In addition, this solution does not use elastic elements such as compression springs, and the force-bearing process returns to a natural state after the key is triggered.
[0034] The beneficial effects of the utility model are as follows:
[0035] 1. The design of the utility model is reasonable. Compared with mechanical buttons, the service life of mechanical buttons is mainly affected by the frequency of use. Taking household appliance buttons as an example, their service life is between 100,000 and 5 million presses. Frequent use will lead to a reduction in usage time. The present structure utilizes the change in suction between the first magnetic element, the second magnetic element, and the third magnetic element to control the circuit in the air. The three magnetic elements and the conductive terminals can be sealed by the sealing plate, which not only has the advantages of dust and corrosion resistance, but also has the advantages of isolating the circuit and preventing electrical leakage of the conductive terminals. In the present structure, mechanical wear is no longer the main factor affecting the service life of the button. Its service life is mainly affected by magnetic attenuation. Taking the common neodymium iron boron magnet as an example, under natural conditions, the magnetic trigger structure of the button designed by the utility model has a slow magnetic attenuation rate and can still perform normal functions in long-term use.
[0036] 2. One driving mechanism can use a fully covered flexible material with elastic force to replace the upper button housing and the compression spring to achieve a fully sealed effect. Another driving mechanism can achieve the effect of not using elastic elements, further improving the service life.
[0037] 3. Compared with the magnetic axis buttons using Hall elements, this structure is not easily affected by the environment and has higher reliability. Taking the standard Hall element as an example, the required temperature range when used is -40℃~+85℃. Taking the common NdFeB magnet as an example, its temperature coefficient is between -0.09% / ℃ and -0.13% / ℃, which satisfies the working temperature range of this structure of -40℃~+150℃.
[0038] 4. Compared with the magnetic axis buttons using electromagnetic structures, the electromagnetic structure needs to be used under the condition of external power supply. In addition, the corresponding control circuit, coil and magnetic core need to be designed. The cost of use is higher and the structure is more complicated. This structure can achieve the same function in a more efficient and convenient way, while the cost of use and maintenance is lower.
[0039] 5. Since the Hall element needs to design a corresponding circuit, the electromagnetic structure needs a magnetic core and a coil, and their sizes are in the millimeter level. In the structure of the utility model, the magnetic element can be manufactured into a small size of millimeter level, micrometer level or even nanometer level through micromachining technology. Therefore, the structure of the utility model can be widely used in the fields of microelectronic equipment and microsensors. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] Figure 1 The utility model is a simplified structural diagram of a magnetic trigger structure of a button of the magnetic button trigger mechanism.
[0041] Figure 2 This is the external contour diagram of the magnetic button trigger structure in Example 1 when it is not triggered.
[0042] Figure 3 This is a front view schematic diagram of the upper shell of the magnetic button trigger structure in Example 1.
[0043] Figure 4 This is a schematic diagram of the explosion of the upper shell of the magnetic button trigger structure in Example 1.
[0044] Figure 5 This is a front view schematic diagram of the button inner shell of the magnetic button trigger structure in Example 1.
[0045] Figure 6 This is a schematic diagram of the explosion of the inner shell of the key of the magnetic key trigger structure in Example 1.
[0046] Figure 7 This is the external contour diagram of the magnetic button trigger structure in Example 2 when it is not triggered.
[0047] Figure 8 This is a front view schematic diagram of the key sliding housing of the magnetic key trigger structure in Example 2.
[0048] Fig. 9 This is a schematic diagram of the explosion of the key sliding shell of the magnetic key trigger structure in Example 2.
[0049] Fig.10 This is a front view schematic diagram of the key fixing inner shell of the magnetic key trigger structure in Example 2.
[0050] Fig.11 This is a schematic diagram of the explosion of the key fixing inner shell of the magnetic key trigger structure in Example 2.
[0051] Fig.12 It is a structural diagram of a state of Example 1.
[0052] Fig.13 It is a structural diagram of another state of Example 1.
[0053] Fig.14 It is a structural diagram of a state of Example 2.
[0054] Fig.15 It is a structural diagram of another state of Example 2.
[0055] Figure markings: 1-first magnetic element, 2-shock-absorbing layer, 3-conductive terminal, 4-conductive layer, 5-insulating layer, 6-second magnetic element, 7-third magnetic element, 8-button inner shell, 9-upper button mechanism, 10-button cap, 11-upper shell, 12-compression spring, 13-lower upper sealing plate, 14-lower lower sealing plate, 15-lower button mechanism, 16-external upper sealing plate, 17-external lower sealing plate, 18-inner upper sealing plate, 19-fixed guide block, 20-inner lower sealing plate, 21-button sliding shell. DETAILED DESCRIPTION
[0056] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0057] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0058] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0059] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0060] Example 1
[0061] like Figure 1 As shown, this embodiment provides a magnetic trigger structure of a key, including a key housing, a first magnetic element 1, a second magnetic element 6, a third magnetic element 7, a conductive terminal 3, a conductive layer 4 and an insulating layer 5;
[0062] The first magnetic element 1, the second magnetic element 6, and the third magnetic element 7 are arranged in sequence from top to bottom in the button housing, and the three have the same magnetic direction and attract each other;
[0063] The conductive terminal 3 is fixed in the key housing between the first magnetic element 1 and the second magnetic element 6; the insulating layer 5 and the conductive layer 4 are sequentially attached to the upper surface of the second magnetic element 6, and a movable gap for the second magnetic element 6 to move up and down is provided inside the key housing below the conductive terminal 3;
[0064] A limiting structure for limiting the displacement of the second magnetic element 6 is provided below the movable gap, and the limiting structure is fixed in the button housing above the third magnetic element 7;
[0065] It also includes a driving mechanism for driving the first magnetic element 1 or the third magnetic element 7 to move up and down to drive the second magnetic element 6 to move up and down in the active gap. The second magnetic element 6 moves up and down in the active gap to achieve conduction or disconnection between the conductive layer 4 and the conductive terminal 3.
[0066] Specifically, the third magnetic element 7 is located below the second magnetic element 6. In a natural state, the second magnetic element 6 is attracted by the third magnetic element 7 and moves closer to the third magnetic element 7 until it is limited by the limiting structure in the button housing.
[0067] This scheme includes two driving forms. The first driving form is: the first magnetic element 1 moves up and down to realize the up and down movement of the second magnetic element 6 in the active gap, thereby realizing the conduction or disconnection of the conductive layer 4 and the conductive terminal 3; the second driving form is: the third magnetic element 7 moves up and down to realize the up and down movement of the second magnetic element 6 in the active gap, thereby realizing the conduction or disconnection of the conductive layer 4 and the conductive terminal 3.
[0068] In detail, when the button is pressed, the distance between the first magnetic element 1 and the second magnetic element 6 or the distance between the second magnetic element 6 and the third magnetic element 7 will change, thereby changing the force condition of the second magnetic element 6, causing the second magnetic element 6 to drive the conductive layer 4 and the insulating layer 5 to move toward the first magnetic element 1, and finally the conductive layer 4 contacts the conductive terminal 3 and connects the circuit.
[0069] The height of the active gap is greater than the sum of the thicknesses of the second magnetic element 6 , the insulating layer 5 and the conductive layer 4 . The active gap is a space for the second magnetic element 6 to move up and down.
[0070] Example 2
[0071] like Figure 2-Figure 6 , Fig.12 , Fig.13 As shown, this embodiment is further optimized on the basis of embodiment 1, specifically:
[0072] The key housing includes a key inner shell 8 and an upper shell 11 fixedly sleeved on the top of the key inner shell 8. The driving mechanism is an upper key mechanism 9 that drives the first magnetic element 1 to move up and down. The upper key mechanism 9 includes a key cap 10 movably sleeved on the top of the upper shell 11 and a compression spring 12. The key cap 10 is partially located in the upper shell 11. The compression spring 12 is fixed between the key cap 10 and the conductive terminal 3. The first magnetic element 1 is fixed to the bottom of the key cap 10 in the upper shell 11.
[0073] The second magnetic element 6 , the third magnetic element 7 , the conductive terminal 3 , the conductive layer 4 and the insulating layer 5 are all located inside the key inner shell 8 .
[0074] Specifically, when the upper part of the key is pressed, the key cap 10 drives the first magnetic element 1 to approach the second magnetic element 6, the compression spring 12 is in a compressed state, and the distance between the first magnetic element 1 and the second magnetic element 6 is reduced, thereby changing the force condition of the second magnetic element 6, causing the second magnetic element 6 to move upward and approach the conductive terminal 3, and the conductive layer 4 and the conductive terminal 3 conduct the circuit.
[0075] When the upper part of the key is restored, the first magnetic element 1 moves away from the second magnetic element 6 under the action of the compression spring 12, and the distance between the first magnetic element 1 and the second magnetic element 6 increases, thereby changing the force condition of the second magnetic element 6, causing the second magnetic element 6 to move downward away from the conductive terminal 3, and the conductive layer 4 is disconnected from the conductive terminal 3 to open the circuit.
[0076] In one embodiment, the compression spring 12 may be replaced with a resilient flexible material.
[0077] Specifically, the compression spring 12 can be replaced with a flexible material with elastic force, and the choice of the flexible material is not limited.
[0078] In one embodiment, a shock absorbing layer 2 is further included. The shock absorbing layer 2 is located in the key inner shell 8 between the first magnetic element 1 and the second magnetic element 6 , and the conductive terminal 3 is tightly attached to the lower part of the shock absorbing layer 2 .
[0079] Specifically, the shock-absorbing layer 2 can be made of different materials and shapes and ultimately achieve the purpose of limiting the movement of the second magnetic element 6 .
[0080] In one embodiment, it also includes a lower upper sealing plate 13 and a lower lower sealing plate 14, the shock absorbing layer 2 is fixed to the bottom of the lower upper sealing plate 13, the lower lower sealing plate 14 is fixed to the bottom of the key inner shell 8, the lower upper sealing plate 13 is fixed to the top of the key inner shell 8, and the third magnetic element 7 is fixed on the lower lower sealing plate 14.
[0081] In one embodiment, the first magnetic element 1 , the second magnetic element 6 , and the third magnetic element 7 are all made of a material selected from the group consisting of magnet, neodymium iron boron, and oxide.
[0082] Specifically, under the premise of satisfying the force-bearing process, the first magnetic element 1 , the second magnetic element 6 and the third magnetic element 7 can be made of a variety of different magnetic materials, including but not limited to magnets, neodymium iron boron and ferrite.
[0083] In addition, the sizes of the first magnetic element 1 , the second magnetic element 6 and the third magnetic element 7 can be enlarged or reduced according to the application scenario and the manufacturing process.
[0084] Through the overall design of this embodiment, the second magnetic element 6 can move up and down in the gap of the key inner shell. It should be noted that the conductive terminal 3 can be located at any pair of non-contacting positions on the same plane, the magnetic poles of the first magnetic element 1, the second magnetic element 6, and the third magnetic element 7 are facing the same direction, and the suction force between the first magnetic element 1 and the second magnetic element 6 is F 12 The sum of the gravity on the second magnetic element 6, the insulating layer 5 attached to the surface, and the conductive layer 4 is G 2 , the attraction between the second magnetic element 6 and the third magnetic element 7 is F 23 .
[0085] The usage process is as follows:
[0086] In a natural state, the second magnetic element 6 is attracted by the third magnetic element 7 and moves close to the third magnetic element 7 , so that the conductive layer 4 is disconnected from the conductive terminal 3 and the circuit is broken.
[0087] When the upper portion 9 of the key is pressed, the compression spring 12 contracts, the first magnetic element 1 moves downward, and the magnetic attraction force F between the first magnetic element 1 and the second magnetic element 6 is 12 Gradually increase, when the force meets:
[0088] F 12 >G 2 +F2 3 , (1)
[0089] Under the combined force of the magnetic field, the second magnetic element 6 approaches the first magnetic element 1 and drives the conductive layer 4 to connect to the conductive terminal 3, thus completing the circuit conduction.
[0090] When the upper portion 9 of the key is released, the compression spring 12 rebounds, the first magnetic element 1 moves upward, and the first magnetic element 1 and the second magnetic element 6 have an attractive force F 12 Gradually decrease, when the force meets:
[0091] F 12 <F 23 +G 2 , (2)
[0092] The second magnetic element 6 approaches the third magnetic element 7 under the combined force of the magnetic field. At this time, the conductive layer 4 leaves the conductive terminal 3 and the circuit is disconnected.
[0093] It should be noted that the force analysis in formulas (1) and (2) is the force condition that needs to be satisfied when the gravity on the second magnetic element 6 is perpendicular to the third magnetic element 7. When the structure is turned upside down, that is, the gravity on the second magnetic element 6 is perpendicular to the first magnetic element 1, the inequality formula (1) will become:
[0094] F 12 +G2 >F 23 , (3)
[0095] Inequality formula (2) becomes:
[0096] F 12 +G 2 <F 23 , (4).
[0097] Example 3
[0098] like Figure 7-Figure 11 , Fig.14 , Fig.15 As shown, this embodiment is further optimized on the basis of embodiment 1, specifically:
[0099] The key housing includes a key fixed inner shell and a key sliding outer shell 21 slidably sleeved on the outer side of the key fixed inner shell. The driving mechanism is a lower key mechanism 15 that drives the third magnetic element 7 to move up and down. The lower key mechanism 15 includes an outer upper sealing plate 16 arranged on the top of the key sliding outer shell 21, and an outer lower sealing plate 17 arranged on the bottom of the key sliding outer shell 21. Two fixed guide blocks 19 are symmetrically arranged on the key fixed inner shell. Two guide grooves that respectively cooperate with the corresponding fixed guide blocks 19 are symmetrically arranged on the key sliding outer shell 21 along the axial direction. The third magnetic element 7 is fixed on the outer lower sealing plate 17.
[0100] The first magnetic element 1 , the second magnetic element 6 , the conductive terminal 3 , the conductive layer 4 and the insulating layer 5 are all located inside the key fixing inner shell.
[0101] An internal upper sealing plate 18 is fixedly provided on the top of the button-fixing inner shell, and an internal lower sealing plate 20 is fixedly provided on the bottom of the button-fixing inner shell.
[0102] The first magnetic element 1 is fixedly arranged on the lower side of the internal upper sealing plate 18, and also includes a shock-absorbing layer 2, which is arranged below the first magnetic element 1, and the conductive terminal 3 is tightly attached to the lower part of the shock-absorbing layer 2, and the second magnetic element 6 is movably arranged between the internal lower sealing plate 20 and the conductive terminal 3.
[0103] Specifically, when the button sliding housing 21 is pressed, the third magnetic element 7 moves away from the second magnetic element 6, and the distance between the third magnetic element 7 and the second magnetic element 6 increases, thereby changing the force condition of the second magnetic element 6, causing the second magnetic element 6 to move upward close to the conductive terminal 3, so that the conductive layer 4 touches the conductive terminal 3 and connects the circuit.
[0104] When the button sliding housing 21 is released from being pressed, the third magnetic element 7 moves towards the second magnetic element 6 under the suction of the second magnetic element 6, and the distance between the third magnetic element 7 and the second magnetic element 6 is reduced, thereby changing the force applied to the second magnetic element 6, causing the second magnetic element 6 to move downward away from the conductive terminal 3, thereby disconnecting the conductive layer 4 from the conductive terminal 3.
[0105] In addition, the present solution does not use elastic elements such as compression springs 12, and the force-bearing process returns to a natural state after the key is triggered.
[0106] Embodiment 3 is another use of a magnetic key structure. Compared with Embodiment 2, the difference is that the key triggering is no longer performed by pressing down the first magnetic element 1, so that the attraction F between the first magnetic element 1 and the second magnetic element 6 is 12 Instead, the suction force F between the second magnetic element 6 and the third magnetic element 7 is changed by pressing down the third magnetic element 7. 23 , thereby changing the force applied to the second magnetic element 6. And with this improvement, the compression spring 12 may no longer be used.
[0107] Through the overall design of the device, the second magnetic element 6 can move up and down in the gap of the key fixing inner shell. It should be noted that the conductive terminal 3 can be located at any pair of non-contacting positions on the same plane, the magnetic poles of the first magnetic element 1, the second magnetic element 6, and the third magnetic element 7 are facing the same direction, and the suction force between the first magnetic element 1 and the second magnetic element 6 is F 12 The sum of the gravity on the second magnetic element 6, the insulating layer 5 attached to the surface, and the conductive layer 4 is G 2 , the attraction between the second magnetic element 6 and the third magnetic element 7 is F 23 The sum of the gravity on the entire key sliding housing 21 including the third magnetic element 7, the external upper sealing plate 16, the external lower sealing plate 17, and the key sliding housing 21 is G 3 .
[0108] The usage process is as follows:
[0109] In the natural state, the second magnetic element 6 is attracted by the third magnetic element 7 and approaches the third magnetic element 7, the conductive layer 4 is disconnected from the conductive terminal 3, and the circuit is broken. The third magnetic element 7 is attracted by the second magnetic element 6 and approaches the second magnetic element 6, and the key sliding outer shell 21 contacts the bottom end of the key fixed inner shell.
[0110] When the key sliding housing 21 is pressed, the third magnetic element 7 follows the outer lower cover plate 17 away from the second magnetic element 6, and the magnetic attraction force F between the second magnetic element 6 and the third magnetic element 7 is 23 Gradually decrease, when the force meets:
[0111] F 12 >G 2 +F 23 , (5)
[0112] The second magnetic element 6 moves closer to the first magnetic element 1 under the combined force of the magnetic field until the conductive layer 4 is connected to the conductive terminal 3 , and the circuit is turned on.
[0113] When the key sliding housing 21 is released, the force on the third magnetic element 7 satisfies:
[0114] F 23 >G 3 , (6)
[0115] At this time, the third magnetic element 7 moves toward the second magnetic element 6 and returns to the state in which the key sliding housing 21 contacts the bottom end of the key fixed inner housing in the natural state. At the same time, the attraction F between the second magnetic element 6 and the third magnetic element 7 is 23 Increase, the force on the second magnetic element 6 satisfies:
[0116] F 23 +G 2 >F 12 , (7)
[0117] Under the combined force, the second magnetic element 6 moves toward the third magnetic element 7 and returns to the natural state where the conductive layer 4 is disconnected from the conductive terminal 3 , and the circuit is broken.
[0118] It should be noted that the force analysis in formulas (5), (6) and (7) is the force condition that needs to be satisfied when the gravity on the second magnetic element 6 is perpendicular to the third magnetic element 7. When the structure is turned upside down, that is, the gravity on the second magnetic element 6 is perpendicular to the first magnetic element 1, the inequality formula (5) will become:
[0119] F 12 +G 2 >F 23 , (8)
[0120] Inequality formula (6) can no longer be used, and inequality formula (7) will become:
[0121] F 12 +G 2 <F 23 , (9).
Claims
1. A magnetic trigger structure for a key, characterized in that: It comprises a key housing, a first magnetic element (1), a second magnetic element (6), a third magnetic element (7), a conductive terminal (3), a conductive layer (4) and an insulating layer (5); The first magnetic element (1), the second magnetic element (6), and the third magnetic element (7) are arranged in sequence from top to bottom in the button housing, and the three have the same magnetic direction and attract each other; The conductive terminal (3) is fixed in the key housing between the first magnetic element (1) and the second magnetic element (6); the insulating layer (5) and the conductive layer (4) are sequentially attached to the upper surface of the second magnetic element (6); and a movable gap for the second magnetic element (6) to move up and down is provided inside the key housing below the conductive terminal (3); A limiting structure for limiting the displacement lower line of the second magnetic element (6) is provided below the movable gap, and the limiting structure is fixed in the key housing above the third magnetic element (7); It also includes a driving mechanism for driving the first magnetic element (1) or the third magnetic element (7) to move up and down, thereby driving the second magnetic element (6) to move up and down in the active gap; the second magnetic element (6) moves up and down in the active gap to achieve conduction or disconnection between the conductive layer (4) and the conductive terminal (3).
2. A magnetic trigger structure for a key according to claim 1, characterized in that: The height of the active gap is greater than the sum of the thicknesses of the second magnetic element (6), the insulating layer (5) and the conductive layer (4), and the active gap is a space provided for the second magnetic element (6) to move up and down.
3. A magnetic trigger structure for a key according to claim 2, characterized in that: The key housing comprises a key inner shell (8) and an upper shell (11) fixedly mounted on the top of the key inner shell (8); the driving mechanism is an upper key mechanism (9) for driving the first magnetic element (1) to move up and down; the upper key mechanism (9) comprises a key cap (10) movably mounted on the top of the upper shell (11) and a compression spring (12); the key cap (10) is partially located in the upper shell (11); the compression spring (12) is fixed between the key cap (10) and the conductive terminal (3); and the first magnetic element (1) is fixed to the bottom of the key cap (10) in the upper shell (11); The second magnetic element (6), the third magnetic element (7), the conductive terminal (3), the conductive layer (4) and the insulating layer (5) are all located inside the key inner shell (8).
4. A magnetic trigger structure for a key according to claim 3, characterized in that: The compression spring (12) can be replaced by a flexible material with elastic force.
5. The magnetic trigger structure of a key according to claim 4, characterized in that: It also includes a shock absorbing layer (2), wherein the shock absorbing layer (2) is located inside the key inner shell (8) between the first magnetic element (1) and the second magnetic element (6), and the conductive terminal (3) is tightly attached to the lower part of the shock absorbing layer (2).
6. A magnetic trigger structure for a key according to claim 5, characterized in that: It also includes a lower upper sealing plate (13) and a lower lower sealing plate (14), wherein the shock absorbing layer (2) is fixed to the bottom of the lower upper sealing plate (13), the lower lower sealing plate (14) is fixed to the bottom of the key inner shell (8), the lower upper sealing plate (13) is fixed to the top of the key inner shell (8), and the third magnetic element (7) is fixed to the lower lower sealing plate (14).
7. The magnetic trigger structure of a key according to claim 5, characterized in that: The first magnetic element (1), the second magnetic element (6), and the third magnetic element (7) are all made of a material selected from the group consisting of magnet, neodymium iron boron, and oxide.
8. The magnetic trigger structure of a key according to claim 2, characterized in that: The key housing comprises a key fixed inner shell and a key sliding outer shell (21) slidably sleeved on the outer side of the key fixed inner shell, the driving mechanism is a lower key mechanism (15) for driving the third magnetic element (7) to move up and down, the lower key mechanism (15) comprises an outer upper sealing plate (16) arranged on the top of the key sliding outer shell (21), and an outer lower sealing plate (17) arranged on the bottom of the key sliding outer shell (21), two fixed guide blocks (19) are symmetrically arranged on the key fixed inner shell, and two guide grooves respectively matched with the corresponding fixed guide blocks (19) are symmetrically arranged on the key sliding outer shell (21) along the axial direction, and the third magnetic element (7) is fixed on the outer lower sealing plate (17); The first magnetic element (1), the second magnetic element (6), the conductive terminal (3), the conductive layer (4) and the insulating layer (5) are all located inside the key fixing inner shell.
9. The magnetic trigger structure of a key according to claim 8, characterized in that: An internal upper sealing plate (18) is fixedly arranged on the top of the key-fixing inner shell, and an internal lower sealing plate (20) is fixedly arranged on the bottom of the key-fixing inner shell.
10. The magnetic trigger structure of a key according to claim 9, characterized in that: The first magnetic element (1) is fixedly arranged on the lower side of the internal upper sealing plate (18), and also includes a shock-absorbing layer (2). The shock-absorbing layer (2) is arranged below the first magnetic element (1), and the conductive terminal (3) is tightly attached to the lower part of the shock-absorbing layer (2). The second magnetic element (6) is movably arranged between the internal lower sealing plate (20) and the conductive terminal (3).