Light touch microswitch based on Hall element

Abstract

The utility model discloses a light touch microswitch based on a Hall element, the switch comprises a housing, a button, a reset device, an annular magnet, a Hall sensor and a PCB, the Hall sensor is fixedly installed on the PCB, the PCB is fixedly installed at the bottom of the housing, the button is installed in the housing, the annular magnet and the button are fixedly installed together, and the reset device is fixedly installed on the housing. The annular magnet is arranged corresponding to the Hall sensor, and the reset device pushes the button to reset. According to the utility model, the rapid overturning characteristic of the magnetic field intensity on the central axis of the annular magnet is utilized, and ultra-short distance overturning triggering and external magnetic field interference shielding effect design are realized through a latch type or unipolar Hall sensor; the Hall sensor is always in a magnetic field and has good magnetic shielding and anti-magnetic interference characteristics, a hysteresis trigger function of the Hall sensor can provide good shake elimination, the magnetic field characteristic of the annular magnet can realize ultrahigh trigger precision of the micro button, and the trigger precision limit of the mechanical touch switch is improved.

Description

Technical Field

[0001] The utility model discloses a switch, in particular a light-touch micro switch based on a Hall element, which belongs to the field distribution of an annular magnet formed by a magnetic sensor to achieve the purposes of hysteresis elimination and magnetic shielding, and can be used in the technical fields of computer cases, keyboards, mice and other instruments and equipment, as well as household appliances. Background Art

[0002] Tactile Switch, also known as touch switch or micro switch, is a common electronic component, mainly used to make electrical connections or disconnections when lightly pressed. They are often used in electronic devices and circuit boards to provide instantaneous switching functions. This switch is widely used in consumer electronics (such as mobile phones, tablets, remote controls), home appliances, computer peripherals (such as keyboards, mice), industrial control equipment, and automotive electronic systems. The advantages of tactile switches include small size, sensitivity, fast response speed, long life (usually hundreds of thousands of times or even more operating life), low cost, etc. These characteristics make them one of the indispensable components in modern electronic products. Overall, tactile switches are a common and powerful electronic switching element with a wide range of applications and provide important control functions for modern electronic devices.

[0003] A touch micro switch is usually composed of a plastic or metal shell with springs, contacts and terminals inside. When pressed, the contacts connect to fixed metal contacts or contacts on the circuit board to complete the circuit. After releasing the pressure, the spring returns the contacts to their original positions, disconnecting the circuit. It lacks a locking function and is not convenient to use in some situations. On the other hand, the touch micro switch uses a metal contact point for connection, which is prone to misoperation due to shaking, thus affecting the use effect. In addition, the waterproof effect of conventional touch micro switches is relatively poor. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art that the light-touch microswitch is prone to cause misoperation, the utility model provides a light-touch microswitch based on a Hall element, which utilizes the rapid reversal characteristics of the magnetic field strength on the central axis of the annular magnet and cooperates with the Hall sensor to realize the light-touch microswitch, which can provide a good de-bouncing effect.

[0005] The utility model adopts the following technical solution to solve the technical problem: a magnetic latch light-touch micro switch, the switch comprising a shell, a button, a reset device, an annular magnet, a Hall sensor and a PCB board, the Hall sensor is fixedly mounted on the PCB board, the PCB board is fixedly mounted on the bottom of the shell, the button is mounted in the shell, the annular magnet and the button are fixedly mounted together, and the annular magnet is arranged corresponding to the Hall sensor, and the reset device pushes the button to reset.

[0006] The technical solution adopted by the utility model to solve its technical problems further includes:

[0007] The resetting device adopts a spring, and the spring is arranged between the shell and the button.

[0008] The button includes a pressing convex head, a limit plate, an installation baffle and a guide inclined surface. The limit plate is arranged on the upper part of the button, the installation baffle is arranged in the middle part of the button, the guide inclined surface is arranged at the lower part of the button, a certain installation space is formed between the installation baffle and the guide inclined surface, the annular magnet is arranged between the installation baffle and the guide inclined surface, and the bottom of the guide inclined surface is inclined.

[0009] The pressing convex head, the limiting plate, the mounting baffle and the guiding inclined surface are integrally arranged.

[0010] An accommodating space is provided at the bottom of the button corresponding to the position of the Hall sensor.

[0011] The shell adopts a hollow cylindrical structure, the top of the shell is sealed, a through hole is opened at the top of the shell, and the button extends out from the through hole.

[0012] A first internal baffle is fixedly arranged at the middle position of the shell, and the reset device is arranged between the first internal baffle and the limiting plate.

[0013] A second inner baffle and a third inner baffle are fixedly arranged at the lower position inside the shell, an installation space is formed between the second inner baffle and the third inner baffle, and the PCB board is clamped between the second inner baffle and the third inner baffle.

[0014] The Hall sensor is a latch type Hall sensor or a unipolar Hall sensor.

[0015] The beneficial effects of the utility model are as follows: the magnetic latch and light-touch microswitch in the utility model utilizes the rapid flipping characteristics of the magnetic field strength on the central axis of the annular magnet. When the outer dimensions of the magnet are fixed, the lower flipping position is not affected by the change of the magnetic field strength, as well as the shielding effect of the magnetic field. The ultra-short distance flip trigger and the shielding effect of the external magnetic field interference effect are realized through a latch-type or unipolar Hall sensor; the Hall sensor is always in the magnetic field, has good magnetic shielding and anti-magnetic interference characteristics, the hysteresis trigger function of the Hall sensor can provide good debouncing, the magnetic field characteristics of the annular magnet can achieve ultra-high micro-button triggering accuracy, improve the triggering accuracy limit of the mechanical light-touch switch, and the non-contact triggering improves the operating noise of household appliances, can well meet the dustproof and waterproof environment, and improve the button life and stability.

[0016] The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0018] Figure 2 It is a schematic diagram of the structure of the utility model in the exploded state.

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0020] Figure 4 This is a schematic diagram of the magnetic field distribution of the utility model.

[0021] Figure 5 for Figure 4 A partial enlarged schematic diagram is shown in the figure.

[0022] In the figure, 1-housing, 11-first internal baffle, 12-second internal baffle, 13-third internal baffle, 14-through hole, 2-button, 21-pressing convex head, 22-limiting plate, 23-installing baffle, 24-guide ramp, 3-spring, 4-magnet, 5-Hall sensor, 6-PCB board. DETAILED DESCRIPTION

[0023] This embodiment is a preferred implementation mode of the utility model. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the utility model.

[0024] Please refer to the attached Figure 1 To Attachment Figure 5 The utility model mainly includes a shell 1, a button 2, a reset device, a ring magnet 4, a Hall sensor 5 and a PCB board 6. The Hall sensor 5 is fixedly mounted on the PCB board 6, the PCB board 6 is fixedly mounted on the bottom of the shell 1, the button 2 is installed in the shell 1, the ring magnet 4 and the button 2 are fixedly mounted together, and the ring magnet 4 is arranged corresponding to the Hall sensor 5, and the reset device pushes the button 2 to reset.

[0025] In this embodiment, the reset device adopts a spring 3, and the spring 3 is arranged between the shell 1 and the button 2. The spring 3 can push the button 2 to pop out to the outside of the shell 1 to achieve the reset effect. In specific implementation, a spring sheet or other elastic structure can also be used to reset the button 2, or the installation position or installation structure of the spring 3 can also be adjusted according to actual conditions, as long as it can meet the requirements of pushing the button 2 to reset.

[0026] In this embodiment, the button 2 includes a pressing convex head 21, a limiting plate 22, a mounting baffle 23 and a guiding inclined surface 24. The pressing convex head 21, the limiting plate 22, the mounting baffle 23 and the guiding inclined surface 24 are integrally arranged, which is more convenient for processing. In specific implementation, the limiting plate 22, the mounting baffle 23 and the guiding inclined surface 24 can also be separately arranged with the pressing convex head 21 and assembled together through an assembly process. The limiting plate 22 is arranged on the upper part of the button 2, and the button 2 can be limited by the limiting plate 22. The mounting baffle 23 is arranged in the middle of the button 2, and the guiding inclined surface 24 is arranged at the lower part of the button 2. A certain installation space is formed between the mounting baffle 23 and the guiding inclined surface 24. The annular magnet 4 is arranged between the mounting baffle 23 and the guiding inclined surface 24. The bottom of the guiding inclined surface 24 is inclined, which is convenient for the annular magnet 4 to be inserted. In this embodiment, a accommodating space is arranged at the bottom of the button 2 corresponding to the position of the Hall sensor 5. When the button 2 is pressed, it will not touch the Hall sensor 5. The above embodiment only provides a specific and feasible button 2 structure, and does not limit the button 2 structure. Other mechanisms that can achieve the same function can be applied to the present utility model.

[0027] In this embodiment, the housing 1 adopts a hollow cylindrical structure, the top of the housing 1 is sealed, and a through hole 14 is opened at the top of the housing 1, from which the pressing protrusion 21 on the button 2 extends. A first internal baffle 11 is fixedly arranged at the middle position inside the housing 1, and a spring 3 is arranged between the first internal baffle 11 and a limit plate 22, and the limit plate 22 pushes the button 2 to reset. A second internal baffle 12 and a third internal baffle 13 are fixedly arranged at the lower position inside the housing 1, and a certain installation space is formed between the second internal baffle 12 and the third internal baffle 13, and the PCB board 6 is clamped between the second internal baffle 12 and the third internal baffle 13. In this embodiment, the cylindrical housing 1 is used as an example for explanation. In the specific implementation, the shape of the housing 1 is not specifically limited, and any housing that can meet the structural requirements of the present invention can be used.

[0028] The annular magnet 4 in the utility model is mounted on the button 2, and can move up and down as the button is pressed and released. The Hall sensor is located on the central axis of the circular hole of the annular magnet and is welded on the PCB. In this embodiment, the annular magnet 4 is preferably in the shape of a circular ring. In specific implementation, a square ring, a rectangular ring or a special-shaped ring can also be used. The Hall sensor 5 can be a latch-type Hall sensor or a unipolar Hall sensor.

[0029] When the utility model is in use, when the button 2 is released, the Hall sensor 5 is in one magnetic pole of the magnetic field; when the button 2 is pressed, the spring 3 is compressed, the annular magnet 5 moves with the button 2, the magnetic field changes and flips, and the Hall sensor 5 is in the other magnetic pole; when the button 2 is released and pressed, the annular magnet 4 moves up and down, and the Hall sensor 5 will be in different magnetic poles of the magnetic field and output different voltage signals to complete the micro switch action.

[0030] The magnetic latch and light-touch microswitch in the utility model utilizes the rapid flipping characteristics of the magnetic field strength on the central axis of the annular magnet. When the outer dimensions of the magnet are fixed, the lower flipping position is not affected by the change of the magnetic field strength, as well as the shielding effect of the magnetic field. The ultra-short distance flip trigger and the shielding effect of the external magnetic field interference effect are realized through a latch-type or unipolar Hall sensor. The Hall sensor is always in the magnetic field and has good magnetic shielding and anti-magnetic interference characteristics. The hysteresis trigger function of the Hall sensor can provide good de-jittering. The magnetic field characteristics of the annular magnet can achieve ultra-high micro-button triggering accuracy, improve the triggering accuracy limit of the mechanical light-touch switch, and the non-contact triggering improves the operating noise of household appliances. It can well meet the dustproof and waterproof environment and improve the button life and stability.

Claims

1. A light touch micro switch based on Hall element, characterized by: The switch comprises a housing (1), a button (2), a reset device, an annular magnet (4), a Hall sensor (5) and a PCB board (6); the Hall sensor (5) is fixedly mounted on the PCB board (6); the PCB board (6) is fixedly mounted on the bottom of the housing (1); the button (2) is mounted inside the housing (1); the annular magnet (4) and the button (2) are fixedly mounted together, and the annular magnet (4) is arranged corresponding to the Hall sensor (5); and the reset device pushes the button (2) to reset.

2. The light-touch micro switch based on the Hall element according to claim 1 is characterized in that: The resetting device adopts a spring (3), and the spring (3) is arranged between the housing (1) and the button (2).

3. The Hall element-based light-touch micro switch according to claim 1 is characterized in that: The button (2) comprises a pressing convex head (21), a limiting plate (22), a mounting baffle (23) and a guiding inclined surface (24); the limiting plate (22) is arranged at the upper part of the button (2); the mounting baffle (23) is arranged at the middle part of the button (2); the guiding inclined surface (24) is arranged at the lower part of the button (2); a certain mounting space is formed between the mounting baffle (23) and the guiding inclined surface (24); the annular magnet (4) is arranged between the mounting baffle (23) and the guiding inclined surface (24); and the bottom of the guiding inclined surface (24) is in the shape of an inclined surface.

4. The Hall element-based light-touch micro switch according to claim 3 is characterized in that: The pressing convex head (21), the limiting plate (22), the mounting baffle (23) and the guiding inclined surface (24) are integrally arranged.

5. The light-touch micro switch based on the Hall element according to claim 1 is characterized in that: An accommodating space is provided at the bottom of the button (2) at a position corresponding to the Hall sensor (5).

6. The Hall element-based light-touch micro switch according to claim 1, characterized in that: The shell (1) has a hollow cylindrical structure. The top of the shell (1) is sealed. A through hole (14) is provided at the top of the shell (1). The button (2) extends from the through hole (14).

7. The Hall element-based light-touch micro switch according to claim 1 is characterized in that: A first internal baffle (11) is fixedly arranged at a central position inside the housing (1), and a reset device is arranged between the first internal baffle (11) and the limit plate (22).

8. The Hall element-based light-touch micro switch according to claim 1 is characterized in that: A second internal baffle (12) and a third internal baffle (13) are fixedly arranged at the lower position inside the housing (1), an installation space is formed between the second internal baffle (12) and the third internal baffle (13), and the PCB board (6) is clamped between the second internal baffle (12) and the third internal baffle (13).

9. The Hall element-based light-touch micro switch according to claim 1, characterized in that: The Hall sensor (5) is a latch-type Hall sensor or a unipolar Hall sensor.

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