Miniature magnetic control switch

Abstract

A miniature magnetic control switch comprises a shell, an upper cover, a spring, a magnet and a magnetic element, the upper cover is movably clamped to the shell in the axial direction of the upper cover, and the upper cover and the shell form a containing cavity; the shell is provided with a second cavity formed by extending from the bottom to the interior of the containing cavity, and the spring is arranged on the outer surface of the second cavity in the shell. The magnet is fixed on the inner side of the upper cover and can be close to the magnetic element along with the movement of the upper cover, so that the state switching of the magnetic element is realized; the magnetic element is located in the second cavity, and the PCB where the magnetic element is located is packaged at the bottom of the shell through glue pouring. Preferably, the magnetic element is one of a reed switch, a magnetic resistor and other magnetic elements.

Description

Technical Field

[0001] The present invention relates to the technical field of switches, and in particular to a miniature magnetically controlled switch. Background Art

[0002] As electronic products continue to evolve toward thinner, lighter, and more portable designs, stricter requirements are placed on the dimensions of their internal components. Micro switches have become essential components in space-constrained applications such as microsensors, industrial automation, precision instruments, and security monitoring. Traditional mechanical switches suffer from mechanical wear and tear under long-term external forces, resulting in low reliability.

[0003] Magnetic switches utilize a contactless operating principle, utilizing a magnetic field to switch between on and off states. This effectively avoids mechanical wear and offers high reliability and stability. In space-constrained applications, the size requirements for electronic components are becoming increasingly stringent. Existing larger magnetic switches are no longer well-suited to the demands of modern electronic devices. Therefore, there is an urgent need to develop smaller, higher-performance magnetic switches to meet the growing demands of diverse applications. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a miniature magnetic control switch. Specifically, the miniature magnetic control switch includes a housing, an upper cover, a spring, a magnet, and a magnetic element, and is characterized in that:

[0005] The upper cover is movably clamped to the shell in its axial direction, and the upper cover and the shell form an accommodating cavity;

[0006] The housing has a second cavity extending from the bottom into the accommodating cavity, and the spring is placed on the outer surface of the second cavity in the housing; the magnet is fixed to the inner side of the upper cover and can approach the magnetic element as the upper cover moves, so that the magnetic element can switch its state;

[0007] The magnetic element is located in the second cavity, and the PCB where the magnetic element is located is encapsulated at the bottom of the shell by glue potting.

[0008] Preferably, the magnetic element is a reed switch, a magnetic resistor or the like.

[0009] Preferably, the magnet is annular, and its axis is parallel to the axis of the upper cover. The magnetic element is also connected in series or in parallel with a light-emitting element such as an LED lamp, a light-emitting diode, etc.

[0010] Furthermore, a boss is provided below the upper cover, and the outer diameter of the boss is larger than the inner diameter of the shell, thereby limiting the upper cover from moving toward the inside of the shell.

[0011] Preferably, the magnetically controlled switch further comprises a key cover, the upper edge of which is located between the upper cover-shaped pressing portion and the boss, and the key cover is made of a waterproof and dustproof material such as silicone or rubber.

[0012] Preferably, the upper cover is made of a light-transmitting polymer material, and the light emitted by the light-emitting element can pass through the upper cover to provide the user with an intuitive status indication.

[0013] Alternatively, the magnet is mounted on the outer surface of the second cavity at the upper end of the spring, and the upper end of the magnet abuts against the bottom of the upper cover, and can approach the magnetic element as the upper cover moves, so that the magnetic element can switch its state.

[0014] Furthermore, the bottom of the upper cover is symmetrically provided with buckles, and the shell is symmetrically provided with mutually matching slots, so that the upper cover and the shell can be movably connected along the axial direction, and the upper and lower edges of the slots provide limits for the movement of the buckles.

[0015] Furthermore, a nut is provided on the shell to limit the installation depth and tighten the lower part of the button cover.

[0016] This practical invention has at least the following beneficial effects:

[0017] The structural design is compact and stable. By selecting the magnet and designing the relative position relationship between the sensing point of the magnetic element and the magnet, the sensitive switching of the magnetic control switch state can be achieved. It has high reliability, compact structure and wide application scenarios.

[0018] The second cavity integrally formed with the housing provides a stable mounting position for the spring, ensuring normal operation of the switch. The spring is placed on the outer surface of the second cavity, making rational use of space and making the overall size of the switch more miniaturized.

[0019] The switch housing and button cover are waterproof and dustproof, and the PCB is encapsulated at the bottom of the housing by glue, which improves the stability of the magnetic control switch and enhances the interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure numerals: 1-shell, 2-upper cover, 3-spring, 4-magnet, 5-magnetic element, 6-key cover, 11-second cavity.

[0021] Figure 1 , is a cross-sectional view of one surface of an embodiment of a magnetically controlled switch;

[0022] Figure 2 , is an exploded schematic diagram of the overall structure of an embodiment of a magnetically controlled switch;

[0023] Figure 3 , is a cross-sectional view of one side of another embodiment of a magnetically controlled switch. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. For example, the installation position of the magnet can be set on the second cavity, or it can be installed on the inner side of the upper cover, or the upper end of the spring can be in contact with the upper cover, and it can be adjusted according to the user's requirements for the size of the switch. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In addition, in the description of the present invention, it should be understood that the orientations or positional relationships indicated by “inside”, “outside”, “top”, “bottom”, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Combine Figure 1 A micro magnetically controlled switch includes a housing 1, an upper cover 2, a spring 3, a magnet 4, and a magnetic element 5. The upper cover 2 and the housing 1 are engaged with each other to form a first accommodating cavity. The housing extends axially from the bottom to form a second cavity 11 in the housing. The second cavity is integrally formed with the housing, and the height of the second cavity is lower than the height of the housing. The spring is located in the first accommodating cavity and on the outer surface of the second accommodating cavity. The second accommodating cavity serves as a fixed support for the spring. The magnet 4 is an annular magnet fixed to the inner side of the upper cover, and the lower end of the magnet abuts against the spring. The upper cover is movably engaged with the housing in the vertical direction. When subjected to an external force, the upper cover moves toward the magnet along its axis from the initial engaged position. The magnetic element is acted upon by the magnetic field, and the circuit in which the magnetic element is connected is connected. The spring is compressed and deformed. When the force disappears, the spring recovers its deformation, and the magnet moves back to its initial position along with the upper cover away from the magnetic element. The magnetic field strength received by the magnetic element is weakened, and the circuit in which it is located is disconnected, and the switch switches to its initial state.

[0027] In one embodiment, the magnetic element is a reed switch. The reed switch 5 is installed perpendicular to the PCB, leaving a certain distance between it and the magnet, and the bottom of the PCB is encapsulated at the bottom of the shell by glue filling. The reed switch is located in the second cavity and parallel to the axis of the cavity. On the one hand, it can reduce the external dimensions of the switch and has a wider range of application scenarios; on the other hand, considering the compact size of the overall size of the switch, when selecting the magnet, its magnetic field strength should not be too strong, causing the two reeds to be in the attracted state and unable to switch. The magnetic field strength of the magnet should not be too small to ensure that the switch state can be switched sensitively during the downward movement of the magnet. The sensing point of the vertically installed reed switch is closer to the strong magnetic field area of ​​the annular magnet, and is more sensitive to changes in magnetic field strength, which can achieve sensitive switching of the switch state.

[0028] In one embodiment, the magnetic element is a magnetic resistor, allowing the switch to be smaller and more widely applicable. The magnetic resistor is located at the bottom of the second cavity on the PCB, which is encapsulated in the bottom of the housing via adhesive. When the magnet approaches the magnetic resistor along the upper cover, the resistance value of the magnetic resistor changes, triggering the switch to activate functions such as device wake-up and key operation.

[0029] In one embodiment, a boss 22 is provided below the upper cover, and the outer diameter of the boss is larger than the inner diameter of the shell. When the upper cover moves downward, the boss is restricted from moving toward the inside of the shell.

[0030] In one embodiment, the magnetically controlled switch further includes a button cover 6, the upper edge of which is located between the upper cover surface-shaped pressing portion and the boss 22, and the other end of the button cover covers the upper edge of the shell. The button cover is made of one of the waterproof and dustproof materials such as silicone and rubber, which effectively prevents external moisture and dust from entering the interior of the switch.

[0031] Preferably, the upper cover surface-shaped pressing part is made of a light-transmitting polymer material, and the magnetic element is also connected in series / parallel with one of the light-emitting elements such as LED lamps and light-emitting diodes. The upper end of the second cavity is in a non-closed state, and the light emitted by the light-emitting element passes through the upper cover surface-shaped pressing part, giving the user an intuitive status indication when the switch state is switched, thereby enhancing the visualization of the switch.

[0032] In one embodiment, a buckle 28 is symmetrically provided at the bottom of the upper cover, and a matching slot 18 is symmetrically provided on the shell. When the magnetic switch is not subjected to external force, the buckle is engaged with the upper edge of the slot. Under the action of external force, the upper cover moves along its axial direction, and the buckle can move to the lower edge of the slot. The upper and lower edges of the slot further limit the moving stroke of the buckle.

[0033] In one embodiment, a nut is provided on the housing and is located below the key cover. The nut can limit the installation depth of the magnetic control switch and tighten the key cover at the same time.

[0034] Combine Figure 3 In one embodiment, the magnet 4 can also be installed on the outer surface of the second cavity at the upper end of the spring. The upper end of the magnet abuts against the bottom of the upper cover and can approach the magnetic element as the upper cover moves, so that the magnetic element can switch its state. Without violating the core content of the invention, adaptive adjustment of the installation position of the magnet falls within the scope of protection of the invention.

[0035] In one embodiment, the pins at the bottom of the switch connected to the circuit board can be a two-wire system or a three-wire system. In a three-wire system, the pins are connected to a power line, a ground line, and a signal line, respectively. When a magnet approaches the switch and closes it, a signal is output via the signal line to a control system, which controls the corresponding device based on the signal.

[0036] The magnetically controlled switch designed in this invention boasts a compact and stable structure. By carefully selecting the magnet's shape and magnetic field strength, designing the relationship between the magnetic element and the magnet, and designing its mounting position on the PCB, the magnetically controlled switch achieves stable and sensitive switching. It also boasts strong anti-interference capabilities and a wide range of applications, specifically designed for low-current applications. The housing and keypad are constructed of waterproof and dustproof materials, and the bottom of the switch is sealed, enhancing its waterproof and dustproof performance. It is suitable for complex working environments such as agricultural and construction machinery.

Claims

1. A miniature magnetic switch, comprising a housing, an upper cover, a spring, a magnet, and a magnetic element, characterized in that: The upper cover is movably clamped to the shell in its axial direction, and the upper cover and the shell form an accommodating cavity; The shell has a second cavity extending from the bottom into the accommodating cavity, and the spring is placed on the outer surface of the second cavity in the shell; The magnet is fixed on the inner side of the upper cover and can approach the magnetic element as the upper cover moves, so that the magnetic element can switch its state; The magnetic element is located in the second cavity, and the PCB where the magnetic element is located is encapsulated at the bottom of the shell by glue potting.

2. The micro magnetic switch according to claim 1, characterized in that: The magnetic element is a reed switch or a magnetoresistive element.

3. The micro magnetic switch according to claim 1, characterized in that: The magnetic element is further connected in series or in parallel with an LED lamp or a light emitting diode element.

4. The micro magnetic switch according to claim 1, characterized in that: The magnet is annular, and its axis is parallel to the axis of the upper cover.

5. The micro magnetic switch according to claim 1, characterized in that: A boss is provided below the upper cover, and the outer diameter of the boss is larger than the inner diameter of the shell, so as to limit the upper cover from moving toward the inside of the shell.

6. The micro magnetic switch according to claim 1 or 4, characterized in that: It also includes a key cover, the upper edge of which is located between the upper cover surface-shaped pressing portion and the boss.

7. The micro magnetic switch according to claim 6, characterized in that: The key cover is made of one of silica gel and rubber waterproof and dustproof materials.

8. The micro magnetic switch according to claim 1, characterized in that: Alternatively, the magnet is mounted on the outer surface of the second cavity, and the magnet abuts against the upper cover.

9. The micro magnetic switch according to claim 1, characterized in that: Buckles are symmetrically provided on the bottom of the upper cover.

10. The micro magnetic switch according to claim 7, characterized in that: The housing is symmetrically provided with card slots, and the upper and lower edges of the card slots provide limits for the movement of the buckle.

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