Mechanical key switch capable of being universally exchanged

Abstract

The utility model discloses a universal and interchangeable mechanical key switch, which is provided with a key shaft capable of moving up and down in a PCB (printed circuit board), a mechanical switch signal can be triggered by pressing the key shaft, the key switch also comprises a magnetic piece capable of moving along with the movement of the key shaft, the PCB is provided with a TMR (total magnetic resonance) module capable of detecting a magnetic field and an LED (light-emitting diode) module capable of emitting light, and the TMR module and the LED module are integrally packaged into a chip patch which is arranged on the PCB. According to the mechanical key switch, through the chip patch design integrating the TMR module and the LED module and the combination of the magnetic piece moving along with the key shaft, the function of adding electromagnetic signal output on the mechanical key is achieved, the mechanical key switch has the advantages of being compact in structure and universal and interchangeable in key, and the reliability of the key switch is improved.

Description

Technical Field

[0001] The utility model relates to the field of switches, in particular to a universal and interchangeable mechanical key switch. Background Art

[0002] Most existing mechanical switches only have space at the bottom for the LED, which limits the size and shape of the new electrical components. If the new component exceeds the space for the existing LED, the mechanical switch or the entire keyboard structure will need to be modified, which may increase manufacturing cost and complexity. The new component and LED may require different electrical interfaces and power requirements, making it impossible to achieve universal interchangeability between mechanical and electrical switches. Utility Model Content

[0003] In view of the above problems, the present invention aims to provide a universal and interchangeable mechanical key switch.

[0004] To achieve this technical objective, the present invention provides a universally interchangeable mechanical key switch, the key switch comprising a key shaft that can move up and down within a PCB board, wherein pressing the key shaft can trigger a mechanical switch signal. The utility model is characterized in that the key switch further comprises a magnetic component that can move with the key shaft, the PCB board being provided with a TMR module that can detect a magnetic field and an LED module that can emit light, the TMR module and the LED module being integrally packaged as a chip patch and provided on the PCB board.

[0005] Preferably, the chip is also encapsulated with an ESD protection element, one end of the pin of the TMR module is connected to the VCC power supply, and the other two ends are connected to the GND ground and OUT signal output; the ESD protection element is connected between the VCC power supply and the OUT signal output to prevent electrostatic discharge; the LED module is powered by the VDD voltage.

[0006] Preferably, the PCB board is provided with a through hole allowing the magnetic member to completely pass downward so that the magnetic member can pass beside the chip when pressed.

[0007] Preferably, the side of the button shaft is also provided with a metal switch spring that can trigger a switch signal, a conductive pin extends from the bottom of the metal switch spring, a conductive socket matching the conductive pin is installed on the PCB board, the top of the conductive socket is a socket portion corresponding to the conductive pin, and the bottom is a socket portion protruding from under the PCB board.

[0008] Preferably, the lowest point of the pressing stroke of the key shaft is not lower than the surface of the conductive socket.

[0009] Preferably, a receiving hole for fixing the socket portion is provided on the PCB board.

[0010] Preferably, it further comprises a key seat, a return spring and a key cover, the key shaft is arranged between the key seat and the key cover, the key cover is buckled on the key seat, and the return spring is sleeved outside the key shaft.

[0011] Preferably, a magnetic capsule is provided in the button shaft, and the magnetic component is installed in the magnetic capsule.

[0012] The beneficial effects of the present invention are as follows: the mechanical key switch, through the chip patch design integrating the TMR module and the LED module, combined with the magnetic part that moves with the key shaft, realizes the function of adding electromagnetic signal output to the mechanical key, has the characteristics of compact structure and universal interchangeability of keys, thereby improving the reliability of the key switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an exploded view of the utility model;

[0014] Figure 2 This is a schematic diagram of the bottom structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the PCB board in the present utility model;

[0016] Figure 4 This is one of the schematic diagrams of the chip structure in this utility model;

[0017] Figure 5 This is the second schematic diagram of the chip structure in this utility model.

[0018] In the figure: 1. key cover; 2. key shaft; 3. metal switch spring; 4. magnetic part; 5. reset spring; 6. key base; 7. chip; 8. PCB board; 9. conductive socket; 901. jack part; 902. socket part. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. To provide a clear and complete description of the technical solution, the following embodiments are selected for illustration; the following embodiments are part of the present invention; any other embodiments obtained based on this application without creative effort are within the scope of protection of the present invention.

[0020] In the following embodiments, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top / bottom," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the clear description of the embodiments. They do not indicate or imply that the devices or components referred to must have a specific orientation and should not be construed as limitations on the present application. Furthermore, the terms "first" and "second" in the embodiments are used solely for descriptive purposes and do not indicate or imply relative importance.

[0021] like Figure 1-5 As shown, the specific embodiment of the present invention provides a universally interchangeable mechanical key switch. Its structure primarily includes a key shaft 2, a magnetic component 4, a PCB board 8, a chip 7 that integrates a TMR module, an LED module, and an ESD protection element, a keybed 6, a return spring 5, and a key cover 1. The TMR module can detect magnetic fields, and the LED module can emit light. The TMR module is a Tunneling Magnetoresistance (TMR) magnetic sensor that utilizes the tunneling magnetoresistance effect to measure changes in magnetic fields through a thin-film tunnel structure.

[0022] The key shaft 2 is designed to be able to move up and down in the PCB board 8. A magnetic capsule (not shown in the figure) is provided inside the key shaft 2. The magnetic component 4 is installed in the magnetic capsule. When the user presses the key shaft 2, the magnetic component 4 will move with the key shaft 2 to the vicinity of the TMR module. The TMR module detects the change in the magnetic field and triggers an electrical signal.

[0023] In this embodiment, one end of the TMR module's pin is connected to the VCC power supply, and the other two ends are connected to the GND ground and the OUT signal output, respectively. An ESD protection element is connected between the VCC power supply and the OUT signal output to prevent electrostatic discharge from damaging the circuit. The LED module is powered by the VDD voltage and operates independently. This circuit design ensures that the push switch can output a stable signal when triggered and provides good anti-static protection.

[0024] To further ensure smooth movement of the key shaft 2, a through-hole (not shown) is provided on the PCB 8 to allow the magnetic element 4 to fully pass downward. This allows the magnetic element 4 to fully travel when the key is pressed, triggering the chip 7, which can detect the magnetic field at both poles of the magnetic element 4, thereby increasing the potential difference during triggering.

[0025] As a mechanical switch signal trigger mode, the side of the key shaft 2 is also provided with a metal switch elastic sheet 3 capable of triggering a switch signal. The bottom of the metal switch elastic sheet 3 extends with a conductive pin. On the PCB 8, a conductive socket 9 matched with the conductive pin is installed. The top of the conductive socket 9 is a socket part 901 corresponding to the conductive pin, and the bottom is a socket part 902 protruding below the PCB 8.

[0026] When the key shaft 2 is pressed, the side of the key shaft 2 is provided with an inclined table capable of extruding the metal switch elastic sheet 3, and the contact between the metal switch elastic sheet 3 is combined, thereby completing the closing of the circuit and triggering the switch signal.

[0027] In actual application, different electronic devices may need different sizes of key switches. Since the TMR needs to be padded to match the magnetic part 4 (the key shaft 2) stroke, the PCB 8 needs to be thickened. If the pressing stroke of the key shaft 2 is too low, the metal switch elastic sheet 3 may not be in correct contact with the conductive socket 9, resulting in that the circuit cannot be closed. Designing the lowest point of the pressing stroke of the key shaft 2 to be not lower than the surface of the conductive socket 9 can ensure that the metal switch elastic sheet 3 can be in correct contact with the conductive socket 9 when installed on the PCB 8 or other components of different thicknesses, thereby triggering the switch signal. This greatly increases the versatility and adaptability of the key switch.

[0028] In order to fix the socket part 901 of the conductive socket 9, the PCB 8 is provided with a receiving hole for fixing the socket part 901. In this way, the conductive socket 9 can be more stably installed on the PCB 8, avoiding loosening or falling off during the key pressing process.

[0029] In the assembly process, the key shaft 2 is arranged between the key base 6 and the key cover 1. The key cover 1 is fixed on the key base 6 in a buckling manner to form a complete key structure. The reset spring 5 is sleeved outside the key shaft 2 and is used for automatically resetting the key shaft 2 after the key is released.

[0030] In order to more stably install the magnetic part 4, the embodiment is provided with a magnetic capsule (not shown in detail) in the key shaft 2. The magnetic part 4 is installed in the magnetic capsule, and through the fixing action of the magnetic capsule, it can be ensured that the magnetic part 4 will not fall off or shift during the movement of the key shaft 2.

[0031] In summary, the mechanical key switch capable of universal interchange provided by the embodiment has the advantages of simple structure, stability and reliability, sensitive triggering, etc., and is suitable for various electronic devices requiring mechanical key input.

[0032] The above is only a preferred embodiment of the present application and does not limit the present application. Any slight modification, equivalent replacement and improvement made according to the technical essence of the present application to the above embodiment shall be included in the protection scope of the technical scheme of the present application.

Claims

1. A universally interchangeable mechanical key switch, characterized by: The key switch has a key shaft that can move up and down in the PCB board. Pressing the key shaft can trigger a mechanical switch signal. It is characterized in that it also includes a magnetic part that can move with the movement of the key shaft. The PCB board is provided with a TMR module that can detect magnetic fields and an LED module that can emit light. The TMR module and the LED module are integrally packaged as a chip patch and are arranged on the PCB board.

2. The universally interchangeable mechanical key switch according to claim 1, characterized in that: The chip is also encapsulated with an ESD protection element. One end of the pin of the TMR module is connected to the VCC power supply, and the other two ends are connected to the GND ground and OUT signal output; the ESD protection element is connected between the VCC power supply and the OUT signal output to prevent electrostatic discharge; the LED module is powered by the VDD voltage.

3. The universally interchangeable mechanical key switch according to claim 2, characterized in that: The PCB board is provided with a through hole that allows the magnetic member to completely pass downward so that the magnetic member can pass beside the chip when pressed.

4. The universally interchangeable mechanical key switch according to claim 3, characterized in that: The side of the key shaft is also provided with a metal switch shrapnel that can trigger a switch signal. A conductive pin extends from the bottom of the metal switch shrapnel. A conductive socket matching the conductive pin is installed on the PCB board. The top of the conductive socket is a socket portion corresponding to the conductive pin, and the bottom is a socket portion protruding from under the PCB board.

5. The universally interchangeable mechanical key switch according to claim 4, characterized in that: The lowest point of the pressing stroke of the key shaft is not lower than the surface of the conductive socket.

6. The universally interchangeable mechanical key switch according to claim 4, characterized in that: The PCB board is provided with a receiving hole for fixing the socket part.

7. The universally interchangeable mechanical key switch according to any one of claims 1 to 6, characterized in that: It also includes a key seat, a return spring and a key cover. The key shaft is arranged between the key seat and the key cover. The key cover is buckled on the key seat. The return spring is sleeved outside the key shaft.

8. The universally interchangeable mechanical key switch according to claim 7, characterized in that: A magnetic capsule is provided in the button shaft, and the magnetic component is installed in the magnetic capsule.

Images