Stable inductance type key

Abstract

The utility model discloses a stable inductance type key. A metal conductor is installed at the bottom of a shaft body; a guide cavity is formed in the key seat, the shaft body can be assembled in the guide cavity in an up-and-down moving mode, a through hole for the metal conductor to pass through is formed in the PCB, and the inductance coil is arranged on the periphery of the through hole in the PCB; the reset spring is sleeved outside the shaft body, one end of the reset spring abuts against the key seat, and the other end of the reset spring abuts against the bottom of the shaft top. The pressing handle is pressed to drive the trigger shaft to overcome the tension of the reset spring to move downwards so as to change the inductance value of the inductance coil to generate a signal. The metal conductor is arranged in the independently arranged trigger shaft, the metal conductor which triggers the inductance coil to generate inductance signals is separated from the pressing handle which easily shakes when being pressed, and the trigger shaft abuts against the center of the bottom of the pressing handle. Therefore, only downward pressure can be intensively conducted to the trigger shaft by unstable pressing on the pressing handle, and the influence of shaking of the pressing handle on the trigger shaft is reduced and blocked to the maximum extent.

Description

Technical Field

[0001] This utility model relates to the field of buttons, specifically to a stable inductive button. Background Technology

[0002] Inductive buttons are non-contact buttons that operate based on the principle of electromagnetic induction. An inductive button contains an inductor coil (or sensor coil). When a metal object approaches this coil, eddy currents are generated within the metal object. These eddy currents, in turn, affect the magnetic field of the inductor coil, causing a change in the coil's inductance. The inductive button detects this change in inductance to determine the proximity of the metal object and triggers the switch accordingly.

[0003] Traditional inductive buttons are designed to directly trigger an inductor coil to generate a signal through a metal handle. However, when the metal handle is pressed, the user's finger may press at different positions, causing the handle to wobble. This wobble can lead to unstable and inaccurate signals from the inductor coil. Furthermore, the one-piece manufacturing method requires the use of a larger metal conductor, which is not conducive to reducing costs. Utility Model Content

[0004] To address the aforementioned problems, this invention aims to provide an inductive button that accurately and stably triggers switch signals.

[0005] To achieve this technical objective, the present invention provides a stable inductive button for triggering an inductor coil on a PCB board to generate a switching signal. The button includes a key base, a return spring, and a handle that can move up and down within the key base. It also includes an independent "T"-shaped trigger shaft, consisting of a shaft top and a shaft body. The trigger shaft's apex contacts the center of the bottom of the handle, and a metal conductor is mounted on the bottom of the shaft body. The key base has a guide cavity, and the shaft body is mounted within this cavity. A through-hole is provided on the PCB board, allowing the metal conductor to pass through. The inductor coil is positioned around the through-hole on the PCB board. The return spring is sleeved on the shaft body, with one end abutting against the key base and the other end abutting against the bottom of the shaft top. Pressing the handle drives the trigger shaft downwards, overcoming the tension of the return spring, thereby changing the inductance of the inductor coil and generating a signal.

[0006] Preferably, the shaft is a hollow structure, the top of the metal conductor is assembled inside the shaft, and the bottom of the metal conductor is a conical structure.

[0007] Preferably, the inner wall of the key base and the outer wall of the key handle are provided with a guide structure that cooperates with each other, and the key handle moves stably up and down along the inner wall of the key base through the guide structure.

[0008] Preferably, the side of the handle is provided with a guide rail, the key base is provided with a guide groove corresponding to the guide rail, the key base is provided with a pair of left and right opposite stabilizers, and the guide rail is provided with two lines on the left and right sides located on the stabilizers.

[0009] Preferably, a raised structure is provided in the middle of the top surface of the shaft.

[0010] Preferably, the bottom of the key socket has a sleeve that protrudes downward to protect the metal conductor.

[0011] Preferably, the device also includes an upper cover, which is fitted onto the key base to limit the upward movement of the key handle.

[0012] The beneficial effects of this utility model are as follows: the metal conductor is set in an independently set trigger shaft, which separates the metal conductor that generates the inductance signal from the trigger inductor coil from the button that is prone to shaking when pressed. By abutting the trigger shaft against the bottom center of the button, the unstable pressing of the button can concentrate the downward pressure to the trigger shaft, which minimizes and eliminates the influence of the button shaking on the trigger shaft, so that the inductance value of the inductor coil changes and generates a stable signal. Attached Figure Description

[0013] Figure 1 This is an exploded view of the present invention;

[0014] Figure 2 This is a schematic diagram of the trigger shaft and PCB board in this utility model;

[0015] Figure 3 This is a schematic diagram of the trigger shaft and metal conductor in this utility model;

[0016] Figure 4 This is a schematic diagram of the bottom structure of the key socket in this utility model;

[0017] Figure 5 This is a schematic diagram of the push handle and trigger shaft in this utility model;

[0018] Figure 6 This is a cross-sectional view of the present invention;

[0019] Figure 7 This is a schematic diagram of the PCB board structure in this utility model.

[0020] In the diagram: 1. Top cover; 2. Button; 201. Guide rail; 3. Trigger shaft; 301. Shaft top; 302. Shaft body; 4. Metal conductor; 5. Return spring; 6. Key seat; 601. Guide cavity; 602. Stabilizer; 603. Guide groove; 604. Sleeve; 7. Inductor coil; 8. PCB board; 801. Through hole. Detailed Implementation

[0021] The present invention will be 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; these embodiments are only some embodiments of the present invention; other embodiments obtained based on this application without creative effort are all within the scope of protection of the present invention.

[0022] In the following embodiments, it should be noted that the terms "upper," "lower," "left," "right," "inner," "outer," "top / bottom," etc., are all based on the orientation or positional relationship shown in the accompanying drawings and are only for the purpose of clearly describing this embodiment. They do not indicate or imply that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this application. At the same time, the terms "first" and "second" in the embodiments are only used for descriptive purposes and do not represent an indication or implication of relative importance.

[0023] like Figure 1-7 As shown, the specific embodiment of this utility model includes a key base 6, a return spring 5, a push button 2, and an independent "T"-shaped trigger shaft 3. The trigger shaft 3 consists of a shaft top 301 and a shaft body 302. These components cooperate to form a complete inductive button; pressing the button triggers an inductor coil 7 on the PCB board to generate a switching signal.

[0024] In this specific embodiment, the shaft top 301 is located at the top of the trigger shaft 3 and is designed to contact the bottom center of the handle 2. The surface of the shaft top 301 may be provided with a protruding structure in the middle to increase the contact area and stability with the handle 2.

[0025] The shaft body 302 of the trigger shaft 3 has a hollow structure. A metal conductor 4 is installed at the bottom of the shaft body 302. The metal conductor 4 is used to generate an inductive effect with the inductor coil 7 on the PCB board. The top of the metal conductor 4 is fitted inside the shaft body 302, while its bottom has a conical structure, which can gradually change the cross-sectional area of ​​the metal conductor 4 when it is close to the inductor coil 7, so as to change the current received by the inductor coil 7 and thus generate different inductance values.

[0026] The key seat 6 has a guide cavity 601, which is used to accommodate the shaft 302 of the trigger shaft 3 and allows the shaft 302 to move up and down within the guide cavity 601. The bottom of the key seat 6 has a sleeve 604 that protrudes downward to protect the metal conductor 4 and prevent the metal conductor 4 from contacting other components when it moves downward.

[0027] To ensure that the key handle 2 can move stably up and down within the key base 6, the inner wall of the key base 6 and the outer wall of the key handle 2 are provided with mutually cooperating guide structures. In a specific embodiment of this application, the side of the key handle 2 may be provided with a guide rail 201, and the key base 6 is provided with a guide groove 603 corresponding to the guide rail 201. In addition, the key base 6 is also provided with a pair of left and right opposite stabilizing frames 602, and the guide rail 201 has two rails on the left and right sides located on the stabilizing frames 602, which restricts the lateral movement of the key handle 2 and further increases the stability of the key handle 2.

[0028] The return spring 5 is sleeved on the outside of the shaft body 302 of the trigger shaft 3, with one end abutting against the key seat 6 and the other end abutting against the bottom of the shaft top 301. When the handle 2 is pressed, the return spring 5 is compressed; when the handle 2 is released, the tension of the return spring 5 resets the trigger shaft 3 and the handle 2.

[0029] The PCB board has a through hole 801 that allows the metal conductor 4 to pass through, and the inductor coil 7 is arranged around the through hole 801 on the PCB board. When the metal conductor 4 passes through the through hole 801, it changes the inductance value of the inductor coil 7, thereby generating a switching signal.

[0030] To limit the upward movement of the key 2, the present invention also includes an upper cover 1. The upper cover 1 is fitted onto the key base 6 and fixedly connected to the key base 6 to ensure that the key 2 does not detach from the key base 6 when it is not pressed.

[0031] When the button 2 is pressed, it moves steadily downwards along the inner wall of the key base 6 via a guide structure, simultaneously driving the trigger shaft 3 to move downwards against the tension of the return spring 5. When the metal conductor 4 passes through the through-hole 801 on the PCB board, the inductance value of the inductor coil 7 changes, thereby generating a switching signal. When the button 2 is released, the tension of the return spring 5 returns the trigger shaft 3 and the button 2 to their initial positions. Furthermore, since the trigger shaft 3 and the metal conductor 4 are independent and stable components, the electronic components are triggered to generate a switching signal via the trigger shaft 3, rather than directly via the button 2 as in traditional structures. This is done to effectively block and reduce the impact of button 2's movement on the trigger inductor coil 7. The metal conductor 4 is located at the bottom of the shaft body 302 of the trigger shaft 3. This design ensures the positional stability of the metal conductor 4 during button operation. As a key component that generates an inductive effect with the inductor coil 7, the stability of the position of the metal conductor 4 is crucial for stable signal transmission. The top point 301 of the trigger switch 3 contacts the center of the bottom of the keycap 2. This connection structure prevents the movement caused by the keycap 2 being pressed at an uncertain position (such as any edge of the keycap) from being transmitted to the trigger switch 3. This ensures that the pressure applied to the keycap 2 is concentrated only on the downward force and transmitted to the trigger switch 3, making the key operation more stable and reliable, and ensuring stable signal transmission. This is especially important for electronic devices that require precise triggering and reliable signal transmission.

[0032] In summary, the inductive button of the present invention has the advantages of stable structure, reliable triggering, and ease of manufacturing and installation, and is particularly suitable for electronic devices that require precise and reliable triggering.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stable inductive key for triggering an inductor coil on a PCB to generate a switching signal, comprising a key base, a return spring, and a push handle that can move up and down within the key base, characterized in that: It also includes an independent "T"-shaped trigger shaft, which consists of a shaft top and a shaft body. The trigger shaft's apex contacts the center of the bottom of the handle, and a metal conductor is installed at the bottom of the shaft body. The key socket has a guide cavity, and the shaft body is mounted in the guide cavity, allowing it to move up and down. The PCB board has through holes that allow the metal conductor to pass through, and the inductor coil is arranged around the through holes on the PCB board. The return spring is sleeved on the shaft body, with one end abutting against the key socket and the other end abutting against the bottom of the shaft top. Pressing the handle drives the trigger shaft to move downward against the tension of the return spring, thereby changing the inductance value of the inductor coil and generating a signal.

2. The stable inductive button according to claim 1, characterized in that: The shaft is a hollow structure, the top of the metal conductor is assembled inside the shaft, and the bottom of the metal conductor is a conical structure.

3. The stable inductive button according to claim 2, characterized in that: The inner wall of the key socket and the outer wall of the key handle are provided with a guide structure that cooperates with each other. The key handle moves stably up and down along the inner wall of the key socket through the guide structure.

4. The stable inductive button according to claim 3, characterized in that: The side of the button is provided with a guide rail, the key base is provided with a guide groove corresponding to the guide rail, the key base is provided with a pair of left and right opposite stabilizers, and the guide rail is provided with two lines on the left and right sides located on the stabilizers.

5. The stable inductive button according to claim 2, characterized in that: A raised structure is provided in the middle of the top surface of the shaft.

6. The stable inductive button according to claim 2, characterized in that: The bottom of the key socket has a downward protruding sleeve for protecting the metal conductor.

7. The stable inductive button according to claim 2, characterized in that: It also includes an upper cover, which is fitted onto the key base to limit the upward movement of the key handle.

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