Full-stroke magnetic bipolar triggered linear key switch

Abstract

The utility model discloses a linear key switch triggered by full-stroke magnetic double poles, a sensor capable of detecting a magnetic field is welded on a PCB (Printed Circuit Board) in a patch manner, the magnetic line detection direction of the sensor is parallel to the direction of the PCB, the two poles of a magnetic piece are arranged to be vertical to the direction of the PCB, the sensor is arranged on the adjacent side of the magnetic piece, and the magnetic piece is arranged on the PCB. The PCB is provided with a through hole which allows the magnetic member to pass through in a complete downward direction, so that the magnetic member can pass through the side of the sensor when being pressed. When the key shaft is pressed, one magnetic pole, away from the sensor, of the magnetic part approaches to the sensor, and the other magnetic pole, close to the sensor, of the magnetic part is away from the sensor, so that the sensor can respectively detect magnetic fields of the two magnetic poles of the magnetic part when the key shaft is pressed. By adopting the design of full-stroke magnetic bipolar triggering, the magnetic fields of the two poles of the magnetic piece can be detected respectively, the potential difference during triggering is increased, the precision of the key switch is improved, and the performance of the key switch is improved.

Description

Technical Field

[0001] The utility model relates to the field of key switches, in particular to a full-stroke magnetic bipolar triggered linear key switch. Background Art

[0002] In the current electronic keyboard market, magnetic axis keyboard, as an emerging input device, has been favored by the majority of users for its unique touch and durability.

[0003] However, existing magnetic keyboards generally use unipolar Hall-effect sensors. Unipolar Hall-effect sensors operate based on the Hall effect, which states that when current passes through a conductor in a magnetic field, a potential difference (Hall voltage) is generated across the conductor. In magnetic keyboards, this conductor is typically a Hall element, while the magnetic field is generated by a magnet under the keyboard key. When a key is pressed, the magnet approaches the Hall element, changing the magnetic field strength around it, triggering the Hall effect and generating a voltage signal. This signal is then converted into an electronic signal, used to identify whether the key is pressed.

[0004] like Figure 9-10 As shown in the figure, due to the characteristics of unipolar Hall effect sensors, the Hall element can only contact the magnetic field at one end of the magnetic part to produce an effect. The design of the magnetic axis keyboard is subject to certain restrictions in key layout, magnet selection and magnetic field optimization. This leads to certain limitations in the Hall output voltage and measurement accuracy of the magnetic axis keyboard. Utility Model Content

[0005] In view of the above problems, the present invention aims to provide a linear key switch with full-stroke magnetic bipolar triggering.

[0006] To achieve this technical objective, the present invention provides a linear push button switch with full-stroke magnetic bipolar triggering, the push button switch comprising a push button shaft that can move up and down, and a magnetic component that moves with the movement of the push button shaft, and a PCB board. A sensor capable of detecting a magnetic field is soldered to a patch on the PCB board. The magnetic field line detection direction of the sensor is parallel to the direction of the PCB board, the two poles of the magnetic component are arranged perpendicular to the direction of the PCB board, the sensor is arranged on the adjacent side of the magnetic component, and a through hole is provided on the PCB board that allows the magnetic component to pass completely downward so that the magnetic component can pass by the side of the sensor when pressed; pressing the push button shaft can move one magnetic pole of the magnetic component away from the sensor closer to the sensor, while the other magnetic pole of the magnetic component adjacent to the sensor moves away from the sensor, so that the sensor can detect the magnetic fields of the two magnetic poles of the magnetic component respectively when the push button shaft is pressed.

[0007] Preferably, the sensor is a Hall element, which is soldered on a PCB board via the bottom of its electrical pins, and the magnetic field line detection direction of the Hall element is configured to be parallel to the bottom of its electrical pins.

[0008] Preferably, the sensor is a TMR sensor, the bottom of the electrical pin of the TMR sensor is soldered to a patch on a PCB board, and the magnetic field line detection direction of the TMR sensor is parallel to the bottom of the electrical pin.

[0009] 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.

[0010] Preferably, the magnetic member is a partial section or the entire section of the shaft extending downward from the key axis.

[0011] Preferably, it also includes an independent sliding shaft with a "T"-shaped structure, which is composed of a shaft top and a shaft body. The sliding shaft is independent of the button handle, and the shaft top contacts the bottom center position of the button shaft; a magnetic capsule is provided at the bottom of the sliding shaft, and the magnetic part is installed in the magnetic capsule.

[0012] Preferably, a metal switch shrapnel that can trigger a switch signal is further provided on the side of the key shaft, a conductive pin extends from the bottom of the metal switch shrapnel, and a conductive socket matching the conductive pin is provided on the PCB board.

[0013] Preferably, a support plate is provided between the PCB board and the key base, and a space-avoiding groove for accommodating the sensor is provided on the support plate.

[0014] The beneficial effects of the present invention are: by adopting a full-stroke magnetic bipolar trigger design, the magnetic fields of the two poles of the magnetic part can be detected separately, the potential difference during triggering is increased, the accuracy of the key switch is improved, the performance of the key switch is enhanced, and a more stable and smooth experience is brought to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The magnetic field line distribution in the pressing state of the first embodiment of the present invention is shown as follows: Figure 1 ;

[0016] Figure 2 The magnetic field line distribution in the pressing state of the first embodiment of the present invention is shown as follows: Figure 2 ;

[0017] Figure 3 The magnetic field line distribution in the pressing state of the second embodiment of the present invention is shown as follows: Figure 1 ;

[0018] Figure 4The magnetic field line distribution in the pressing state of the second embodiment of the present invention is shown as follows: Figure 2 ;

[0019] Figure 5 This is an exploded view of the third embodiment of the present utility model;

[0020] Figure 6 This is a partial schematic diagram of the Hall element used in the third embodiment of the present invention;

[0021] Figure 7 This is a partial schematic diagram of a TMR sensor used in Example 3 of the present utility model;

[0022] Figure 8 This is an exploded view of the fourth embodiment of the present utility model;

[0023] Figure 9 Designed for conventional products in the background technology of this utility model Figure 1 ;

[0024] Figure 10 Designed for conventional products in the background technology of this utility model Figure 2 .

[0025] In the figure: 1. Key shaft; 2. Magnetic part; 3. PCB board; 4. Hall element; 4', TMR sensor; 5. Through hole; 6. Reset spring; 7. Key cover; 8. Sliding shaft; 81. Shaft top; 82. Shaft body; 9. Magnetic capsule; 10. Support plate; 101. Air avoidance groove; 11. Metal switch spring; 12. Conductive pin; 13. Conductive socket; 14. Key base. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] The present invention aims to provide a linear push button switch with full-stroke magnetic bipolar triggering. The core of the invention is to optimize the relative position and movement of the sensor and the magnetic component to realize bipolar magnetic field detection during the pressing process of the push button switch, thereby improving the accuracy and stability of the signal triggering.

[0029] like Figure 1-2 As shown in the figure, Example 1 proposes a full-travel magnetic bipolar-triggered linear key switch. The switch primarily comprises a keybed 14, a keycap 7, a return spring 6, a key shaft 1, a magnetic element 2 (with distinct north and south poles, perpendicular to the PCB), a PCB 3, and a magnetic field sensor. In this embodiment, a Hall effect element 4 is soldered to the PCB via the bottom of its electrical pins. Alternatively, a 90° flip package can be used. The magnetic field detection direction is configured parallel to the bottom of its electrical pins to ensure that the two poles of the magnetic element interact with the sensor in different magnetic fields during key shaft movement. The magnetic element 2 can be a partial or complete section of the downwardly extending shaft of the key shaft. The Hall effect element 4 is positioned adjacent to the magnetic element 2. The PCB 3 includes a through-hole 5 that allows the magnetic element 2 to fully descend, allowing it to pass beside the Hall effect element 4 when pressed. A return spring 6 is sleeved around the key shaft 1 to reset the key shaft 1 and magnetic element 2 after the key is released.

[0030] Pressing the key shaft 1 can move one magnetic pole of the magnetic part 2 away from the Hall element 4 closer to the Hall element 4, while the other magnetic pole of the magnetic part adjacent to the Hall element 4 is away from the Hall element 4, so that the Hall element 4 can detect the magnetic fields of the two magnetic poles of the magnetic part 2 respectively when the key shaft 1 is pressed.

[0031] Specifically, when the button is not pressed, the two poles of the magnetic part 2 maintain a certain distance from the sensor 4, and the sensor 4 does not detect obvious changes in the magnetic field. When the user presses the button shaft 1 downward, the magnetic part 2 moves downward accordingly. Since the two poles of the magnetic part 2 are perpendicular to the PCB board 3, when it first moves downward, the N pole gradually approaches the Hall element 4. As it continues to move downward and passes under the through hole 5, the S pole gradually approaches the Hall element 4, and the N pole gradually moves away. The Hall element 4 therefore detects that the magnetic field generated by the S pole increases, while the magnetic field generated by the N pole weakens. The Hall element 4 converts the detected magnetic field changes into electrical signals, which are then captured by the circuit processing unit and converted into identification information that the button has been pressed. After the button is released, the reset spring 6 resets the button shaft 1 and the magnetic part 2 to their initial positions.

[0032] like Figure 3-4As shown, Example 2: Based on Example 1, this example replaces the Hall element 4 with a TMR (Tunneling Magnetoresistance) sensor 4'. The TMR sensor 4' also detects magnetic field lines in a direction parallel to the bottom of its electrical pins. The TMR sensor 4' senses the strength and direction of the magnetic field by detecting the change in resistance of the tunnel current under the influence of the magnetic field. During key pressing, the change in the magnetic field at the two poles of the magnetic element 2 causes the resistance value of the TMR sensor 4' to change. The TMR sensor 4' has positive and negative pins and a signal output pin. The bottom of the electrical pins of the TMR sensor 4' is soldered to the PCB board 3.

[0033] like Figure 5-7 As shown, Example 3: This embodiment introduces the design of a sliding shaft 8 and a magnetic capsule 9 on the basis of Example 1 or 2, aiming to improve the stability of the movement of the magnetic part 2 and reduce the jitter. The sliding shaft 8 is designed as a "T"-shaped structure, consisting of a shaft top 81 and a shaft body 82. The shaft top 81 contacts the bottom center position of the key shaft 1 in a point contact manner. The magnetic capsule 9 is connected to the bottom of the shaft body 82, and the magnetic part 2 is placed in the magnetic capsule 9. The design of the sliding shaft 8 makes the magnetic part 2 more stable during movement and reduces the jitter caused by the direct connection to the key shaft 1. The magnetic capsule 9 further limits the magnetic part 2, making the magnetic part 2 more stable during movement. Among them, the reset spring 6 is sleeved on the outside of the shaft body 82, one end of the reset spring 6 abuts on the key seat, and the other end abuts on the bottom of the shaft top 81.

[0034] A support plate 10 is further provided between the PCB board 3 and the key base 14 . The support plate 10 is provided with a space-avoiding groove 101 for accommodating a sensor to protect the sensor from external interference.

[0035] like Figure 8 As shown in the figure, Example 4: This example builds on Examples 1 or 2 by adding a metal switch spring 11 and a conductive pin 12, achieving dual-mode triggering of the key switch. The metal switch spring 11, which triggers the switch signal, is located on the side of the key shaft 1. A conductive pin 12 extends from the bottom of the metal switch spring 11, and a matching conductive socket 13 is provided on the PCB 3. Key recognition is achieved through mechanical contact, improving the reliability of the key switch.

[0036] A support plate 10 is further provided between the PCB board 3 and the key base 14 . The support plate 10 is provided with an airtight groove 101 for accommodating the sensor and the conductive jack 12 to protect the sensor from external interference.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent replacements and improvements made to the above embodiments based on the technical essence of the present invention should be included in the scope of protection of the technical solution of the present invention.

Claims

1. A full-stroke magnetic bipolar trigger linear key switch, comprising a key shaft that can move up and down, a magnetic member that moves with the key shaft, and a PCB board on which a sensor capable of detecting a magnetic field is soldered. The switch is characterized in that: The magnetic field line detection direction of the sensor is parallel to the direction of the PCB board, the two poles of the magnetic component are arranged to be perpendicular to the direction of the PCB board, the sensor is arranged on the adjacent side of the magnetic component, and the PCB board is provided with a through hole that allows the magnetic component to pass completely downward so that the magnetic component can pass by the side of the sensor when pressed; pressing the button shaft can move one magnetic pole of the magnetic component away from the sensor closer to the sensor, while the other magnetic pole of the magnetic component adjacent to the sensor is moved away from the sensor, so that the sensor can detect the magnetic fields of the two magnetic poles of the magnetic component respectively when the button shaft is pressed.

2. The full-stroke magnetic bipolar triggered linear key switch according to claim 1, characterized in that: The sensor is a Hall element, which is soldered on a PCB board via the bottom of its electrical pins. The magnetic field line detection direction of the Hall element is configured to be parallel to the bottom of its electrical pins.

3. The full-stroke magnetic bipolar triggered linear key switch according to claim 1, characterized in that: The sensor is a TMR sensor, the bottom of the electrical pin of the TMR sensor is welded to a patch on a PCB board, and the magnetic field line detection direction of the TMR sensor is parallel to the bottom of the electrical pin.

4. The full-stroke magnetic bipolar triggered linear key switch according to claim 2 or 3, 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.

5. The full-stroke magnetic bipolar triggered linear key switch according to claim 4, characterized in that: The magnetic member is a partial section or the entire section of the shaft column extending downward from the key axis.

6. The full-stroke magnetic bipolar triggered linear key switch according to claim 4, characterized in that: It also includes an independent sliding shaft with a "T"-shaped structure, which is composed of a shaft top and a shaft body. The sliding shaft is independent of the button handle, and the shaft top contacts the bottom center position of the button shaft; a magnetic capsule is provided at the bottom of the sliding shaft, and the magnetic part is installed in the magnetic capsule.

7. The full-stroke magnetic bipolar triggered linear key switch according to claim 4, characterized in that: A metal switch shrapnel that can trigger a switch signal is also provided on the side of the key shaft. A conductive pin extends from the bottom of the metal switch shrapnel, and a conductive socket that matches the conductive pin is provided on the PCB board.

8. The full-stroke magnetic bipolar triggered linear key switch according to claim 4, characterized in that: A support plate is further provided between the PCB board and the key base, and a space-avoiding groove for accommodating the sensor is opened on the support plate.

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