Switch switching control structure, electronic product and switch stroke customization method

Abstract

Disclosed in the present invention are a switch switching control structure, an electronic product and a switch stroke customization method. The switch switching control structure comprises a switch and a PCB; the switch comprises an insulating body, and a pressing part and a reset member which are mounted on the insulating body, the lower end of the pressing part being provided with a metal member; the PCB is located below the switch, and the PCB is provided with a coil and an inductance measurement drive IC, the inductance measurement drive IC being connected to the coil. When the pressing part is pressed, the metal member moves downward relative to the insulating body along with the pressing part until the inductance measurement drive IC senses that an inductance change amount or an inductance amount of the coil reaches a set value, so as to complete the switching of a function 1 to a function 2 of the switch; and after the pressing part is released, the metal member automatically resets upward along with the pressing part under the action of the reset member, so as to complete the switching of the function 2 to the function 1 of the switch. The switch switching control achieves fast response, is more energy-saving than a magnetic induction mode, and allows the switch press-triggered stroke to be freely customized.

Description

Switch switching control structure, electronic product and switch stroke self-definition method TECHNICAL FIELD

[0001] The present application relates to the technical field of switches, in particular to a switch switching control structure, an electronic product and a switch stroke self-definition method. BACKGROUND

[0002] Traditional switches mainly include mechanical contact switches and magnetic induction switches. In actual use, mechanical contact switches are prone to mechanical or electrical degradation, which affects the use performance of the switches. Moreover, the welding feet of multiple terminals need to be welded and fixed to the PCB, which is troublesome to install and inconvenient to disassemble for maintenance and replacement.

[0003] For example, a common micro switch such as CN 218274362U generally includes a button, a cover, a switching spring, a plastic base, a common terminal and a normally open terminal arranged on the plastic base. The common terminal and the normally open terminal are usually made of metal. The common terminal has a common closed end exposed on the plastic base and a first external pin exposed on the outer surface of the plastic base. The normally open terminal has a normally open closed end exposed on the plastic base and a second external pin exposed on the outer surface of the plastic base. The switching spring is usually made of metal. One end of the switching spring is provided with a contact point and extends into a switching gap above the normally open closed end. The other end of the switching spring is electrically connected to the common closed end. The cover is generally mounted on the plastic base. A button hole is provided on the top of the cover for mounting the button. The upper end of the button is exposed on the top of the cover, and the lower end of the button acts on the switching spring. In installation and application, the first external pin and the second external pin need to be inserted and welded to the PCB, which is troublesome to install and inconvenient to disassemble for maintenance and replacement. Pressing the button causes the contact point of the switching spring to deform downward and abut against the normally open closed end, so that the normally open terminal and the common terminal form a contact and are connected. Releasing the button causes the switching spring to reset upward, and the contact point of the switching spring is separated from the normally open closed end to form a disconnection. In this way, the switching switch is controlled. This welding and fixing structure is difficult to achieve high waterproof requirements. In long-term actual use, the waterproof performance is not ideal, and mechanical or electrical degradation may affect the use performance of the switch.

[0004] Compared with the magnetic induction switch, the mechanical shaft switch in the prior art needs to be welded to the PCB board one by one for multiple terminal pins. For example, CN 210246715 U discloses a magnetic shaft switch, which comprises a circuit board, a shell arranged above the circuit board, a handle slidingly connected to the shell, an elastic element accommodated in the shell and abutting against the handle, a Hall element electrically connected to the circuit board, a magnet arranged in the shell and corresponding to the Hall element, and a metal isolation sheet arranged between the Hall element and the magnet and capable of moving with the handle. The metal isolation sheet is driven to move by sliding of the handle to change the signal change between the Hall element and the magnet to realize the instant input or cut-off function of the switch. However, the magnetic induction switch consumes more energy.

[0005] Therefore, it is necessary to study a new technical solution to solve the above problems. Technical solution

[0006] Therefore, the present application aims at the defects in the prior art, and the main purpose is to provide a switch switching control structure, an electronic product and a switch stroke self-definition method, which has fast switch switching control response and saves energy compared with the magnetic induction method.

[0007] Another purpose is to provide a switch switching control structure, an electronic product and a switch stroke self-definition method, which has a switch pressing touch stroke and is easy to define freely.

[0008] To achieve the above purpose, the present application adopts the following technical solution:

[0009] A switch switching control structure comprises:

[0010] A switch, which comprises an insulating body, a pressing portion mounted on the insulating body and a reset member; the lower end of the pressing portion is provided with a metal piece; the pressing portion is movably arranged up and down relative to the insulating body, and the reset member provides the pressing portion with an automatic upward reset force;

[0011] A PCB board, which is located below the switch and is provided with a coil and an inductance detection driving IC on the PCB board; the inductance detection driving IC is connected to the coil;

[0012] When the pressing portion is pressed, the metal piece moves downward together with the pressing portion relative to the insulating body to approach the coil until the inductance detection driving IC senses that the inductance change amount or inductance amount of the coil reaches a set value, thereby completing the switching of function one to function two of the switch, and after the pressing portion is released, the metal piece moves upward automatically under the action of the reset member, thereby completing the switching of function two to function one of the switch.

[0013] An electronic product comprising a switch control structure as claimed in any one of the preceding claims.

[0014] A switch stroke self-defining method, the switch comprising an insulating body and a pressing part and a reset part mounted on the insulating body; the lower end of the pressing part is provided with a metal part; the pressing part is movably arranged up and down relative to the insulating body, and the reset part provides the pressing part with an automatic upward reset force; a coil and an inductance detection driving IC are arranged for the metal part, and the inductance detection driving IC is connected to the coil; when the pressing part is pressed, the metal part moves downward together with the pressing part relative to the insulating body until the inductance detection driving IC senses that the inductance variation or inductance of the coil reaches a set value, thereby completing the switching of functions one to two of the switch, and after the pressing part is released, the metal part moves upward automatically under the action of the reset part, thereby completing the switching of functions two to one of the switch.

[0015] When it is necessary to define or redefine the pressing stroke of the switch, the pressing stroke is set through a software interface on the electronic product where the switch is located or the connected electronic product; and the parameters that need to be set when setting the pressing stroke include one or more of the inductance variation of the coil, the inductance of the coil, and the relative distance between the metal part and the coil.

[0016] Compared with the prior art, the present application has obvious advantages and beneficial effects, specifically, as known from the above technical solution, it breaks the traditional switch structure and the traditional switching mode; when the pressing part is pressed, the metal part moves downward together with the pressing part relative to the insulating body to approach the coil until the inductance detection driving IC senses that the inductance variation or inductance of the coil reaches a set value, thereby completing the switching of functions one to two of the switch; this kind of structure / way using current induction saves 80% energy compared with the magnetic induction mode; compared with the traditional terminal contact switch, since it has no mechanical or electrical degradation and is easy to waterproof, it has good reliability and significantly prolonged service life; moreover, it has fast signal response (for example, 250us response time), is more convenient to install and hot plug than the traditional welding switch scheme, it saves the terminal welding process and avoids the inconvenience of disassembly caused by welding fixation. In addition, the switch pressing stroke is easy to define freely. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is an exploded view of an inductance induction micro switch and a PCB board according to an embodiment of the present application;

[0018] Fig. 2 is a perspective view of the inductance induction micro switch mounted on the PCB board according to the embodiment of the present application;

[0019] Figure 3 is another perspective view of the inductively sensitive microswitch of embodiment one of the present application mounted on a PCB;

[0020] Figure 4 is a front view of the inductively sensitive microswitch of embodiment one of the present application mounted on a PCB;

[0021] Figure 5 is a cross-sectional view of the inductively sensitive microswitch of embodiment one of the present application mounted on a PCB;

[0022] Figure 6 is a perspective view of the inductively sensitive microswitch of embodiment one of the present application;

[0023] Figure 7 is another perspective view of the inductively sensitive microswitch of embodiment one of the present application;

[0024] Figure 8 is a cross-sectional view of the inductively sensitive microswitch of embodiment one of the present application;

[0025] Figure 9 is an exploded view of the inductively sensitive microswitch of embodiment one of the present application;

[0026] Figure 10 is another exploded view of the inductively sensitive microswitch of embodiment one of the present application;

[0027] Figure 11 is a perspective view of the linkage rod and metal piece of the inductively sensitive microswitch of embodiment one of the present application;

[0028] Figure 12 is another perspective view of the linkage rod and metal piece of the inductively sensitive microswitch of embodiment one of the present application;

[0029] Figure 13 is a diagram showing the EM field around the coil inducing eddy currents in the metal piece as the metal piece approaches the coil;

[0030] Figure 14 is a diagram showing the measurement circuit implemented by a pair of Ctx / CRx pins of the inductance detection driver IC to measure the change in inductance;

[0031] Figure 15 is a perspective view of the mechanical shaft inductive sensing switch of embodiment two of the present application;

[0032] Figure 16 is a cross-sectional view of the mechanical shaft inductive sensing switch of embodiment two of the present application and a PCB;

[0033] Figure 17 is an exploded view of the mechanical shaft inductive sensing switch of embodiment two of the present application. Best Mode for Carrying Out the Invention

[0034] Referring to Figures 1 to 17, the detailed structure of the embodiments of the present application is shown.

[0035] A switch switching control structure adopts current induction mode; the switch switching control structure includes a switch and a PCB board; the switch type can not be limited, which has a pressing part, a reset part, and a metal part.

[0036] The switch includes an insulating body and a pressing part and a reset part installed on the insulating body; the lower end of the pressing part is provided with a metal part; the pressing part is movably arranged up and down relative to the insulating body, and the reset part provides the pressing part with an automatic upward reset force; the PCB board is located below the switch, the PCB board is provided with a coil and an inductance detection driving IC, the inductance detection driving IC is connected to the coil, the coil is located below the metal part, the inductance detection driving IC has a CRx pin and a CTx pin, the CRx pin and the CTx pin are respectively connected to both ends of the coil. The inductance or inductance change sensed by the inductance detection driving IC to the coil is set to adjust the touch stroke of the pressing part. When the pressing part is pressed, the metal part is displaced downward together with the pressing part relative to the insulating body to approach the coil until the inductance detection driving IC senses the inductance change or inductance of the coil reaches the set value, thereby completing the switching of functions one to two of the switch, and after releasing the pressing part, the metal part is automatically reset upward together with the pressing part under the action of the reset part, thereby completing the switching of functions two to one of the switch.

[0037] In this paper, two types of products, microswitch and mechanical shaft switch, are taken as examples for illustration.

[0038] As shown in FIGS. 1-14, example one takes a microswitch as an example for illustration.

[0039] An inductance induction microswitch includes an insulating body 10', a connecting rod 21', a metal part 40, a switching spring 30', and a button 20'.

[0040] The insulating body 10' is provided with a movable hole 110' extending upward and downward, and a first elastic sheet supporting point 311'. The connecting rod 21' is installed in the movable hole 110' and can move upward and downward relative to the insulating body 10'. The connecting rod is generally injection molded, and is a plastic piece. The upper end of the connecting rod is provided with a linkage groove 211'. The metal piece 40 is arranged at the lower end of the connecting rod 21' and moves upward and downward with the connecting rod 21'. One end 31' of the switching elastic sheet 30' is arranged at the first elastic sheet supporting point 311', and the other end 32' acts on the connecting rod 21'. Specifically, the other end 32' of the switching elastic sheet 30' extends into or through the linkage groove 211'. The button 20' is arranged on the insulating body 10' and can move upward and downward to drive the switching elastic sheet 30'. The button 20' is pressed on the upper surface of the switching elastic sheet 30', and the pressure receiving part of the switching elastic sheet 30' is located between the one end and the other end of the switching elastic sheet 30'.

[0041] When the button 20' is pressed, the switching elastic sheet 30' is pressed so that the other end is deformed downward, thereby driving the connecting rod 21' and the metal piece 40 to move downward. During the downward movement, the other end of the switching elastic sheet 30' abuts against the inner bottom surface of the linkage groove 211'. After the button 20' is released, the other end is reset upward, thereby driving the connecting rod 21' and the metal piece 40 to move upward. After complete reset, the other end of the switching elastic sheet 30' abuts against the inner top surface of the linkage groove 211' or maintains a gap with the inner bottom surface and the inner top surface of the linkage groove 211'.

[0042] Further, the insulating body 10' is further provided with a second switch piece supporting point 321', and the switch piece 30' is connected with an auxiliary elastic arm 33', the fixed end of the auxiliary elastic arm 33' is connected to the switch piece 30' near the other end, the auxiliary elastic arm 33' extends downward towards the second switch piece supporting point 321', the free end of the auxiliary elastic arm 33' acts on the second switch piece supporting point 321', and the pressure receiving position is between the first switch piece supporting point 311' and the second switch piece supporting point 321'. In this way, the switch piece 30' can adopt the structure of the switch piece 30' of a conventional micro switch, which is generally made of stainless steel and can generate a switch operating force and has a good switching feel. When the button 20' is pressed, the switch piece 30' is pressed to deform the other end downward, the fixed end 331' of the auxiliary elastic arm 33' deforms downward together with the switch piece 30' to change the relative position of the fixed end 331' and the free end 332', and the auxiliary elastic arm 33' itself deforms and is in an energy storage state. In this embodiment, the insulating body 10' includes a base 11' and a cover 12' (in other embodiments, the cover 12' is not necessarily required); the movable hole, the first switch piece supporting point 311', and the second switch piece supporting point 321' are all arranged on the base 11', the cover 12' is provided with a avoiding hole 122', the cover 12' is assembled on the base 11' to cover the linkage rod 21', the switch piece 30', the first switch piece supporting point 311', and the second switch piece supporting point 321', the button 20' passes through the avoiding hole and protrudes above the cover 12', and the avoiding hole can be used to position the button 20'. Generally, the cover 12' can be snap-fitted on the base 11', for example, a buckle hole 121' is arranged on the side wall of the cover 12', a buckle protrusion 112' is arranged on the base 11' correspondingly, and the buckle protrusion 112' is buckled into the buckle hole 121'. In addition, the bottom of the insulating body 10' is provided with a mounting positioning column or / and a mounting buckle arm 112 for insertion on a PCB.

[0043] In theory, only the first elastic sheet support point 311' and the second elastic sheet support point 321' are needed to be preset on the insulating body 10', and the preset manner and material can not be limited. In actual production, the traditional micro switch with a pre-embedded metal terminal can still be used, for example, the first metal terminal 301' and the second metal terminal 302' are fixed or inserted into the insulating body 10' by injection molding, and the upper ends of the first metal terminal 301' and the second metal terminal 302' protrude from the insulating body 10' to serve as the corresponding first elastic sheet support point 311' and the second elastic sheet support point 321' respectively. The first metal terminal 301' and the second metal terminal 302' are connected as an integral terminal, or each is independently provided. In the embodiment, the two are formed as an integral terminal by a connecting sheet. The bottom of the metal terminal does not need to protrude from the bottom of the insulating body 10' like the metal terminal of the traditional micro switch, that is, the bottom end of the metal terminal is hidden inside the insulating body 10'. The upper ends of the metal terminals protrude from the insulating body 10' to serve as the corresponding first elastic sheet support point 311' and the second elastic sheet support point 321' respectively, which takes advantage of the strength and rigidity of metal materials, and the stamping formed metal terminal has mature processing technology and low cost

[0044] The movable hole 110' includes a first through hole 1 and a second through hole 2 which are sequentially penetrated from top to bottom, the second through hole 2 is larger than the first through hole 1, so that a step surface 3 is formed between the inner side surface of the first through hole 1 and the inner side surface of the second through hole 2, the linkage rod 21' extends into the first through hole 1, and the metal piece 40 is located in the second through hole 2 and is limited below the step surface 3. Moreover, the lower end of the linkage rod 21' extends outwardly with a widened portion 212' around the periphery, the widened portion 212' is located in the second through hole 2 and is limited below the step surface 3. Therefore, during the upward resetting action, the upward stroke of the linkage rod 21' can be limited by the stop of the widened portion 212' by the step surface 3, and it is not necessary to rely on the contact and collision between the metal piece 40 and the step surface 3 for limiting, so that the metal piece 40 is better protected.

[0045] The metal piece 40 is connected and fixed to the lower end of the linkage rod 21' in the way of riveting, injection molding or buckling. The metal piece 40 is a pot-shaped metal sheet. The pot shape means that the metal sheet extends upwards in the form of an arc or an inclined surface from the central position of the bottom of the metal sheet to the periphery. This kind of pot-shaped structure can improve the strength of the metal sheet and the linearity and consistency of the induction signal. The metal sheet is synchronously linked with the linkage rod 21', and can be stamped and formed from copper alloy or other materials to obtain the metal sheet. The metal sheet is connected and fixed to the lower end (specifically, the lower end of the widened part 212') of the linkage rod 21' in the way of riveting, injection molding or buckling. Preferably, the pot-shaped metal sheet is a central symmetric structure relative to the axis, and the linkage rod 21', the first through hole and the second through hole are also central symmetric structures relative to the axis. The linkage rod 21' extends into the first through hole, and the gap between the linkage rod 21' and the inner wall surface of the first through hole is 0-1 mm.

[0046] Next, an electronic product is introduced. In actual production and manufacturing, the electronic product can be widely used in industrial input devices and hardware such as switches used in computer and mobile phone peripheral products such as mouse, gamepad, keyboard and remote controller. The electronic product comprises an electronic product main body, a PCB 100 arranged on the electronic product main body and a switch 200 mounted above the PCB 100. The switch 200 is a micro switch of inductive induction as described above; the PCB 100 is provided with a coil 101 and an inductance detection driving IC 102 (also referred to as an inductance measurement chip), the inductance detection driving IC 102 is connected to the coil 101, and the coil 101 is located below the metal piece 40. Preferably, the inductance detection driving IC is arranged at the bottom of the PCB and below the coil, two conductive connection holes 104 corresponding to the two ends of the coil can be arranged on the PCB, the conductive connection holes 104 pass through the upper and lower ends of the PCB, the coil can be mounted on the PCB later or integrated with the coil layer during the PCB process, and the CRx pin and the CTx pin of the inductance detection driving IC are connected to the two ends of the coil through the corresponding conductive connection holes. Usually, a resistor R is connected in series between the CTx pin and one end of the coil 101, so as to form a self-induction mode measurement circuit.

[0047] During installation, the mounting positioning column 111 or / and the mounting buckle arm of the insulating body 10 at the bottom can be used to form plug-in positioning with the corresponding mounting hole 103 on the PCB 100, so as to facilitate installation and realize hot plug. After installation, the bottom end of the insulating body 10 is arranged on the top end surface of the PCB 100, and the coil 101 is located in the area surrounded by the lower end opening of the second through hole 2.

[0048] In this embodiment, the coil 101 is a spiral winding arranged on the top surface of the PCB 100, and the spiral direction is taken as the rotation center of the vertical axis, and the coil is arranged in a gradually increasing spiral from the inside to the outside. Therefore, the coil is usually arranged horizontally in a flat shape, and the top surface of the coil is flush with or slightly higher than the top surface of the PCB 100. If it is arranged slightly lower than the top surface of the PCB 100, it is also acceptable. The inductance detection driving IC 102 is a known IC, which is an inductance measurement chip used for detecting inductance or inductance change, such as IQS9320, IQS7320 and other chips of Azoteq brand. The inductance detection driving IC 102 is connected to the coil 101, and the coil 101 is located below the metal piece 40, preferably the coil is located directly below the metal piece 40. When the button is pressed, the metal piece 40 and the connecting rod 21' are displaced downward relative to the insulating body 10 to approach the coil 101, and the inductance detection driving IC 102 senses the inductance change one of the coil 101, thereby completing the switching of functions one to two of the switch (also referred to as the switching of 0-1 of the switch), and after releasing the button, the metal piece 40 and the connecting rod 21' are automatically reset upward under the action of the reset piece, so that the metal piece 40 is away from the coil 101, and the inductance detection driving IC 102 senses the inductance change two of the coil 101 (also referred to as the switching of 1-0 of the switch), thereby completing the switching of functions two to one of the switch. Functions one and two refer to two different states, and the switch is used to switch between the two states, for example: function one is off, and function two is on.

[0049] The measurement of inductance change is completed by a pair of CRx pin and CTx pin. The EM block around the coil 101 is generated by the excitation signal at the CTx pin, and the inductance measurement of the coil 101 is performed on the CRx pin. When the metal piece 40 approaches the coil 101 downward, the EM field around the coil 101 induces eddy current in the metal piece 40, and the direction of the eddy current is such that it generates an opposite EM field, which causes the total inductance of the coil 101 to decrease. The inductance detection driving IC 102 measures the inductance change and calculates the distance between the metal piece 40 and the PCB board 100 (or the coil), so that when applied to an actual product, the trigger point (touch stroke) can be freely adjusted, because the inductance change sensed by the inductance detection driving IC can be set to calculate the corresponding distance, which is the difference between the original position height of the metal piece 40 (referring to the position height of the metal piece 40 relative to the PCB board 100 or the coil 101) and the pressing stroke (also referred to as the touch stroke) after the pressing stroke. In this way, by setting the inductance or inductance change, the touch stroke of the button can be adjusted accordingly. For manufacturers / users, on electronic products, the touch stroke of the button can be customized, especially for different applications with different button strokes. That is, the touch stroke of the button is adjusted by setting the inductance or inductance change sensed by the inductance detection driving IC. Therefore, the button can be completely customized, the position points of triggering and releasing can be set, different button strokes can be configured for different applications to meet individual use requirements. For manufacturers, mass production of a type of product / switch is easy to control and set various touch stroke parameters to meet individual order requirements. In actual design and production, all buttons on an electronic product can be connected and controlled by the same inductance detection driving IC, or a part of the buttons on an electronic product can be connected and controlled by one inductance detection driving IC, and another part of the buttons can be connected and controlled by another inductance detection driving IC. Further, the buttons can be divided into three or more parts, and the third part of the buttons can be connected and controlled by a third inductance detection driving IC, and so on. For different parts of the buttons, the touch stroke of the button can be freely defined, or even a single switch can be connected and controlled by a single inductance detection driving IC, so that for the same electronic product, the buttons can have the same touch stroke or different touch strokes, without limitation. The definition of the touch stroke of the button includes two parameters, trigger position and release position, and different touch strokes can mean that one or both of the two parameters are different.

[0050] And, a switch stroke customization method is provided, the stroke refers to the pressing stroke (or touch stroke) of the switch, the switch includes an insulating body and a pressing part and a reset member installed on the insulating body; the lower end of the pressing part is provided with a metal part; the pressing part is movably arranged up and down relative to the insulating body, and the reset member provides the pressing part with an automatic upward reset force; a coil and an inductance detection driving IC are provided for the metal part, and the inductance detection driving IC is connected to the coil; when the pressing part is pressed, the metal part is displaced downward together with the pressing part relative to the insulating body until the inductance detection driving IC senses that the inductance change amount or the inductance amount of the coil reaches a set value, thereby completing the switching of functions one to two of the switch, and after the pressing part is released, the metal part is automatically reset upward together with the pressing part under the action of the reset member, thereby completing the switching of functions two to one of the switch.

[0051] When it is necessary to define or redefine the pressing stroke of the switch, the pressing stroke is set through a software interface on the electronic product on which the switch is located or the electronic product connected thereto, and the parameters that need to be set when setting the pressing stroke include one or more of the inductance change amount of the coil, the inductance amount of the coil, and the relative distance between the metal part and the coil. Taking a computer keyboard used by a user as an example, after the purchased keyboard is connected to the computer, a software will be popped up, and the user can freely set the touch stroke of the key on the software. Various setting parameters (such as various touch strokes that have been configured) can be provided on the software interface for the user to select and set, and the user can also define a touch stroke other than the configured parameters.

[0052] As shown in FIGS. 15-17, the specific structure of embodiment two is shown, which is taken as an example to illustrate a mechanical shaft switch. Similarly, such a mechanical shaft switch can be widely applied to various electronic products as described above.

[0053] A mechanical shaft inductance sensing switch includes an insulating body 10, a shaft core 20, a reset spring 30, and a metal part 40.

[0054] The insulating body 10 is provided with an axial core movable hole extending upward and downward; the insulating body 10 comprises a base 11 and a cover 12 assembled with each other. The axial core 20 is installed in the axial core movable hole and can be movably arranged upward and downward relative to the insulating body 10; the reset spring 30 is generally a metal compression spring, and two ends of the reset spring 30 act on the insulating body 10 and the axial core 20 respectively to provide the axial core 20 with an automatic upward reset force; the metal piece 40 is arranged at a lower end of the axial core 20 to move upward and downward together with the axial core 20, and the metal piece 40 is located below the reset spring 30; when the axial core 20 is pressed, the metal piece 40 moves downward together with the axial core 20 and away from the lower end of the reset spring 30, and the reset spring 30 is in an energy storage state; after the axial core 20 is released, the reset elastic force of the reset spring 30 drives the axial core 20 to reset upward, and the metal piece 40 moves upward correspondingly to approach the lower end of the reset spring 30.

[0055] In the embodiment, the axial core movable hole comprises a first through hole 1 and a second through hole 2 which are sequentially penetrated from top to bottom, the second through hole 2 is larger than the first through hole 1, so that a stepped surface 3 is formed between the inner side surface of the first through hole 1 and the inner side surface of the second through hole 2, the second through hole 2 penetrates the bottom of the base 11 downward, the axial core 20 extends into the first through hole 1, and the metal piece 40 is located in the second through hole 2 and is limited below the stepped surface 3. In addition, the insulating body 10 is provided with an annular groove 4 surrounding the outer periphery of the first through hole 1, and the lower end of the reset spring 30 extends into the annular groove 4. In addition, the bottom of the insulating body 10 is provided with a mounting positioning column 111 or / and a mounting buckle arm for being inserted into a PCB 100.

[0056] The shaft core 20 comprises a shaft body 21, an upper end connecting part 22, a lower end connecting part 23, a shielding part 24 and a lateral guiding part 25. The shaft body 21, the upper end connecting part 22 and the lower end connecting part 23 are arranged vertically. The upper end connecting part 22 is integrally connected to the upper end of the shaft body 21. For a keyboard, the upper end connecting part 22 is usually used to connect with a key cap. Therefore, the upper end connecting part 22 is close to or serves as a pressing end. The lower end connecting part 23 is integrally connected to the lower end of the shaft body 21. The metal piece 40 is connected to the lower end connecting part 23. The shielding part 24 is integrally outwardly extended from the periphery of the upper end of the shaft body 21. The reset spring 30 and the first through hole 1 are located in the downward projection area of the shielding part 24. Thus, the switch interior is well shielded and protected. The lateral guiding part 25 is connected to the outer edge of the shielding part 24. The shielding part 24 comprises a top end shielding plate 241 and lateral shielding plates 242. The top end shielding plate 241 is integrally outwardly extended from the periphery of the upper end of the shaft body 21 and exceeds the entire periphery of the upper end of the shaft body 21. The upper end of the reset spring 30 acts on the bottom surface of the top end shielding plate 241. The lateral shielding plates 242 are symmetrically arranged and integrally downwardly extended from the outer edges of the top end shielding plate 241. The lateral guiding part 25 is provided with two lateral guiding parts 25. The lateral guiding part 25 is outwardly protruded from the outer side surface of the lateral shielding plate 242. The insulating body 10 is provided with a guiding groove 26 extending vertically. The inner side surface of the guiding groove 26 is provided with a protruding rib 261 for reducing contact friction and improving vertical movement smoothness. The lateral guiding part 25 is located in the guiding groove 26. The upper end of the lateral guiding part 25 is limited by the inner top surface of the guiding groove 26 to prevent the shaft core 20 from being upwardly pulled out. The guiding groove 26, the annular groove 4, the first through hole 1 and the second through hole 2 are arranged on the base 11. The reset spring 30 and the shaft core 20 are mounted on the base 11. The cover 12 is mounted on the base 11. The top end shielding plate 241 is exposed on the top of the cover 12. A buckle protrusion 112 is usually arranged on the side surface of the base 11. Correspondingly, a through buckle hole 121 is arranged on the side surface of the cover 12. When the cover 12 is buckled on the base 11, the buckle protrusion 112 is buckled in the corresponding buckle hole 121. Generally, the inner top surface of the guiding groove 26 is reserved on the inner side wall of the cover 12. Therefore, when the cover 12 and the base 11 are assembled, the inner top surface is vertically located above the guiding groove 26 to limit the lateral guiding part 25.

[0057] The metal piece 40 is a pot-shaped metal sheet. The pot shape means that the metal sheet extends upward in an arc or inclined surface from the central position of the bottom of the metal sheet. This kind of pot-shaped structure can improve the strength of the metal sheet and the linearity and consistency of the inductive signal. The metal sheet is synchronously connected with the shaft core, and can be made of copper alloy or other materials by stamping forming. The metal sheet is connected and fixed to the lower end of the shaft core by riveting, injection molding or buckling. Preferably, the pot-shaped metal sheet is centrally symmetric relative to the axis, and the shaft core 20, the reset spring 30, the first through hole 1, the second through hole 2 and the annular groove 4 are also centrally symmetric relative to the axis. The shaft core 20 extends downward into the first through hole 1, and the gap between the shaft core 20 and the inner wall of the first through hole 1 is 0-1 mm.

[0058] Since the metal piece 40 is located below the reset spring 30, the metal piece 40 is in the initial state (not pressed), the pressed state (including the pressing and descending process and reaching the trigger point), and the reset spring 30 is always above the metal piece 40. In actual production, considering the strength and service life, the reset spring 30 needs to be selected as a metal spring. This kind of structure design can effectively avoid the influence of the reset spring 30 on the inductance of the coil and affect the accurate and rapid response of the switch.

[0059] The inductive induction switching control principle of the second embodiment is the same as that of the first embodiment, which will not be repeated here.

[0060] From the above two embodiments, it can be seen that the inductive induction mechanical shaft switch and the inductive induction micro switch are simpler in structure than the traditional mechanical shaft switch and the micro switch, easy to produce and manufacture, and can use part of the design of the traditional switch. It is suitable to maintain the appearance, pressing operation mode and feel of the traditional switch, replace the traditional switch for application in electronic products, and will not cause too much design change of the electronic products. Therefore, it has strong applicability, and is not required to consider the terminal contact function of the traditional switch. When designing the switch product of the present application, it is more flexible and free, and is not limited. The production efficiency and yield of the switch are improved.

[0061] The design of the present application focuses on breaking the traditional switch structure and the traditional switching mode. When the pressing part is pressed, the metal part is displaced downward with the pressing part relative to the insulating body to approach the coil until the inductance detection driving IC senses that the inductance change amount or inductance amount of the coil reaches a set value, and then the switching of the functions one to two of the switch is completed. This kind of structure / way using current induction saves 80% energy compared with magnetic induction mode. Compared with the traditional terminal contact switch, since it has no mechanical or electrical degradation and is easy to waterproof, it has good reliability, significantly prolongs the service life, and has fast signal response (for example, 250us response time). Compared with the traditional welding switch scheme, it is more convenient to install and hot plug, it saves the terminal welding process, and also avoids the inconvenience of disassembly caused by welding fixation.

Claims

1. A switching control structure, characterized by, The switch comprises an insulating body, a pressing part mounted on the insulating body, and a reset member; a lower end of the pressing part is provided with a metal piece; the pressing part is movably arranged on the insulating body; the reset member provides the pressing part with an automatic upward reset force; A PCB board is arranged below the switch; the PCB board is provided with a coil and an inductance detection driving IC; the inductance detection driving IC is connected to the coil; When the pressing part is pressed, the metal piece moves downward with the pressing part relative to the insulating body to approach the coil until the inductance detection driving IC senses a change in inductance of the coil or the inductance reaches a set value, thereby completing switching of functions one to two of the switch; when the pressing part is released, the metal piece moves upward with the pressing part under the action of the reset member, thereby completing switching of functions two to one of the switch. The inductance of the coil sensed by the inductance detection driving IC is set to adjust the touch stroke of the pressing part.

2. The switching control configuration of claim 1, wherein, The inductance detection driving IC has a CRx pin and a CTx pin; the CRx pin and the CTx pin are respectively connected to two ends of the coil.

3. The switching control configuration of claim 1, wherein, The metal piece is a pot-shaped metal sheet.

4. The switching control configuration of claim 1, wherein, The insulating body is provided with a first through hole and a second through hole arranged in sequence from top to bottom; the second through hole is larger than the first through hole, so that a step surface is formed between an inner side surface of the first through hole and an inner side surface of the second through hole; the pressing part extends into the first through hole; the metal piece is located in the second through hole and is limited below the step surface.

5. The switching control configuration of claim 4, wherein, A bottom end of the insulating body is arranged at a top end of the PCB board; the coil is located in a region surrounded by a lower end opening of the second through hole.

6. The switching control structure of claim 5, wherein, The reset member is a metal spring piece or a metal spring; the reset member is located above the metal piece.

7. The switching control configuration of claim 1, wherein, The switch is a mechanical shaft switch or a micro switch.

8. The switching control configuration of claim 1, wherein, The switch switching control structure comprises any one of the switches according to claims 1 to 8.

9. An electronic product, characterized by ​ 10. A method of switch travel customization, characterized by, The switch comprises an insulating body, a pressing part and a reset part mounted on the insulating body; the lower end of the pressing part is provided with a metal part; the pressing part is movably arranged on the insulating body; the reset part provides the pressing part with an automatic upward reset force; a coil and an inductance detection driving IC are arranged for the metal part, and the inductance detection driving IC is connected to the coil; when the pressing part is pressed, the metal part is displaced downward with the pressing part relative to the insulating body until the inductance detection driving IC senses that the inductance variation of the coil or the inductance reaches a set value, thereby completing the switching of functions one to two of the switch; after the pressing part is released, the metal part is automatically reset upward with the pressing part under the action of the reset part, thereby completing the switching of functions two to one of the switch; when the pressing stroke of the switch needs to be defined or redefined, the pressing stroke is set through a software interface on the electronic product where the switch is located or the connected electronic product; the parameters that need to be set when setting the pressing stroke include one or more of the inductance variation of the coil, the inductance of the coil and the relative distance between the metal part and the coil.

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