Push type capacitive sensing switch

Abstract

The utility model discloses a push type capacitive sensing switch, which comprises a key, an elastic piece, an inner shell and a conductive film layer, the key is movably arranged on the shell wall on one side of the inner shell through an elastic piece, a pressing block is arranged on the key in a protruding mode, the pressing block is suspended and movably abuts against the shell wall, and the conductive film layer is arranged on the shell wall, corresponding to the pressing block, on the other side of the inner shell in a tightly attached mode. The key is pressed to enable the pressing block to abut against the shell wall on one side of the inner shell through the elastic piece, and a voltage difference signal is generated through the conductive film layer to trigger the switch. According to the utility model, the conductive film layer can generate a voltage difference signal only by pressing the key, so that the switch is not easily triggered by mistake due to accumulated water on the surface of the key or careless touch of a hand, the structure is simple, and the stability of effective triggering of the switch is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a push-button capacitive induction switch. Background Art

[0002] With the improvement of living standards, people are increasingly pursuing the intelligence of bathroom products. Existing bathroom products usually use electronic button switches. As Figure 1 shown, the existing capacitive induction switch usually consists of a housing 1' and a control board 2' arranged inside the housing 1'. A metal film layer 3' is provided on the control board 2', and the metal film layer 3' is closely attached to the housing wall of the housing 1'. When a user presses the surface of the housing 1' with a hand, a micro-capacitor is formed with the metal film layer 3' as the positive electrode of the capacitor, the housing wall as the dielectric, and the hand as the negative electrode of the capacitor, thereby generating a voltage difference signal, enabling the control board 2' to control the switch to trigger.

[0003] However, for the existing capacitive induction switch, since the housing is used as the triggering area, it is prone to accidental triggering when the user's hand accidentally touches it. In addition, when the capacitive induction switch is applied to relatively humid environments such as bathrooms and kitchens, the housing surface often comes into contact with water. Because water is a conductor, it will damage the micro-capacitor structure, easily cause the switch to malfunction, the triggering is not stable enough, and it affects the use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a push-button capacitive induction switch, which can prevent accidental triggering of the switch and improve the stability of effective triggering of the switch.

[0005] To achieve the above object, the solution of the utility model is: a push-button capacitive induction switch, including a button, an elastic member, an inner housing, and a conductive film layer; the button is movably arranged on the housing wall on one side of the inner housing through the elastic member, the button protrudes with a pressing block, the pressing block is suspended and movably abuts against the housing wall, and the conductive film layer is closely attached to the housing wall on the other side of the inner housing corresponding to the pressing block; when the button is pressed, the pressing block abuts against the housing wall on one side of the inner housing through the elastic member, and a voltage difference signal is generated through the conductive film layer to trigger the switch.

[0006] Preferably, it further includes a control board, the control board is arranged on the housing wall on the other side of the inner housing, and the conductive film layer is electrically connected and arranged on the control board.

[0007] Preferably, the conductive film layer adopts a metal film layer.

[0008] Preferably, a step surface is formed around the pressing block on one side of the inner housing, one end of the elastic member abuts against the step surface, and the other end of the elastic member abuts against the button.

[0009] Preferably, the pressing block is cylindrical, and the step surface is annular.

[0010] Preferably, the stepped surface includes a first stepped surface and a second stepped surface, and the height between the first stepped surface and the key is greater than the height between the second stepped surface and the key.

[0011] Preferably, a drain groove is formed on the inner housing, and the drain groove extends to the first stepped surface and communicates with the first stepped surface.

[0012] Preferably, the elastic member is a compression spring. One end of the compression spring abuts against the first stepped surface, and the other end of the compression spring abuts against the key. The key squeezes the compression spring and abuts against the second stepped surface.

[0013] Preferably, the key is circular, and a flange is circumferentially provided on the edge of the key. The key squeezes the compression spring, and the flange abuts against the second stepped surface.

[0014] Preferably, it further includes an outer housing. The inner housing is arranged on the outer housing. A relief through hole is formed in the outer housing at a position matching the key, and the compression spring pushes the flange of the key to abut against the outer housing at the edge of the relief through hole.

[0015] After adopting the above scheme, the beneficial effects of the present utility model are as follows: The key of the present utility model is movably arranged on the housing wall on one side of the inner housing through an elastic member. A suspended pressing block is provided on the key, and the conductive film layer is tightly arranged on the housing wall on the other side of the inner housing corresponding to the pressing block. When the key is pressed and the pressing block abuts against the housing wall on one side of the inner housing through the elastic member, a voltage difference signal will be generated on the conductive film layer to trigger the switch. Only by pressing the key will a voltage difference signal be generated on the conductive film layer, so that the switch is not easily mis-triggered due to water accumulation on the surface area of the key or accidental touch by the hand. The structure is simple, and the stability of the effective triggering of the switch is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an existing capacitive induction switch;

[0017] Figure 2 is a schematic overall structural diagram of the present utility model;

[0018] Figure 3 is a schematic structural diagram of the present utility model with the outer housing removed;

[0019] Figure 4 is a top view of the present utility model with the outer housing removed;

[0020] Figure 5 is Figure 4 a cross-sectional view taken along the A-A direction in

[0021] Figure 6 is Figure 5 an enlarged schematic view at B in

[0022] Figure 7 is a partial exploded structural schematic diagram of the present utility model with the outer casing removed;

[0023] Figure 8 is Figure 7 an enlarged schematic diagram of the position C in

[0024] Figure 9 is a partial exploded structural schematic diagram of another angle of the present utility model with the outer casing removed.

[0025] Reference numeral description:

[0026] 1. Button; 11. Pressing block; 12. Flange; 13. Metal insert; 2. Elastic member; 21. Compression spring; 3. Inner casing; 31. First stepped surface; 311. Limiting rib; 32. Second stepped surface; 33. Drainage groove; 4. Conductive film layer; 5. Control board; 6. Outer casing; 7. Display screen; 8. Relief hole. Specific embodiments

[0027] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] This embodiment provides a push-button capacitive induction switch, as Figures 2 to 9 shown, including a button 1, an elastic member 2, an inner casing 3, and a conductive film layer 4; the button 1 is movably arranged on the casing wall on one side of the inner casing 3 through the elastic member 2, the button 1 protrudes with a pressing block 11, the pressing block 11 is suspended and movably abuts against the casing wall, and the conductive film layer 4 is tightly arranged on the casing wall on the other side of the inner casing 3 corresponding to the pressing block 11; pressing the button 1 causes the pressing block 11 to abut against the casing wall on one side of the inner casing 3 through the elastic member 2, and a voltage difference signal is generated through the conductive film layer 4 to trigger the switch.

[0029] In this embodiment, when the button 1 is in the initial position, the button 1 is pushed by the elastic member 2, and the pressing block 11 will be in a suspended state. At this time, an air layer is formed between the pressing block 11 and the casing wall of the inner casing 3. When the user's hand is placed on the surface of the button 1, a micro-capacitor is formed with the conductive film layer 4 as the positive electrode of the capacitor, the casing wall of the inner casing 3 cooperating with the air layer and the pressing block 11 as the medium, and the hand as the negative electrode of the capacitor. Due to the existence of the air layer, the capacitance signal value is relatively weak. Therefore, the conductive film layer 4 will not generate a voltage difference signal. Even if the surface of the button 1 is flooded with water or the button 1 is accidentally touched, the switch will not be triggered. The structure is simple, which can effectively prevent mis-triggering and improve the stability of the effective triggering of the switch.

[0030] In this embodiment, a pressing block 11 is arranged on the button 1, as Figure 6 and Figure 9As shown, a metal insert 13 can also be embedded in the briquette 11 to amplify the capacitance signal, making the trigger of the switch more sensitive when the button 1 is pressed.

[0031] As Figure 7 shown, it further includes a control board 5, the control board 5 is arranged on the housing wall on the other side of the inner housing 3, and the conductive film layer 4 is electrically connected to the control board 5.

[0032] In this embodiment, the conductive film layer 4 is electrically connected to the control board 5, which simplifies the assembly process of the switch. The control board 5 incorporates necessary logic circuits and microprocessors, capable of quickly receiving the voltage difference signal generated by the conductive film layer 4, thereby controlling the switch state and improving the stability and reliability of the switch.

[0033] Furthermore, the conductive film layer 4 in this embodiment uses a metal film layer, which has good electrical conductivity, can more effectively transmit and sense charges, and improves the sensitivity and response speed of the switch. The resistance value of the metal film layer is relatively low, which is beneficial to improving the signal stability.

[0034] As Figures 5 to 8 shown, a stepped surface is formed around the briquette 11 on one side of the inner housing 3. One end of the elastic member 2 abuts against the stepped surface, and the other end of the elastic member 2 abuts against the button 1.

[0035] The stepped surface in this embodiment plays a role in supporting and limiting the elastic member 2, enabling the briquette 11 on the button 1 to maintain a stable movement trajectory during the pressing process through the elastic member 2, which helps to improve the pressing stability and feel of the button 1. The structure is simple and easy to install.

[0036] As Figure 9 shown, the briquette 11 is cylindrical, and the stepped surface is annular. The cylindrical shape of the briquette 11 in this embodiment is conducive to production and processing, reduces the manufacturing difficulty and cost, and improves production efficiency. Setting the stepped surface as annular can provide uniform supporting force for the elastic member 2. In other embodiments, the size and shape of the briquette 11 and the stepped surface can also be adjusted.

[0037] As Figures 5 to 8 shown, the stepped surface includes a first stepped surface 31 and a second stepped surface 32. The height between the first stepped surface 31 and the button 1 is greater than the height between the second stepped surface 32 and the button 1. In this embodiment, a circular limiting rib 311 is provided on the first stepped surface 31. The housing wall between the first stepped surface 31 extending to the second stepped surface 32 and the limiting rib 311 can play a role in limiting the elastic member 2, enabling the button 1 to remain stable when pressed and ensuring accurate triggering of the switch.

[0038] As Figure 2 and Figure 8As shown, a drain groove 33 is formed on the inner housing 3. The drain groove 33 extends to the first step surface 31 and is in communication with the first step surface 31. In this embodiment, the liquid accumulated in the inner housing 3 can be discharged through the drain groove 33, improving the service life of the switch.

[0039] As Figure 6 and Figure 8 shown, the elastic member 2 is a compression spring 21. One end of the compression spring 21 abuts against the first step surface 31, and the other end of the compression spring 21 is in contact with the button 1. The button 1 presses the compression spring 21 and abuts against the second step surface 32. In this embodiment, the elastic member 2 is a compression spring 21, which has a simple structure. By selecting a suitable compression spring 21, the pressing force and stroke of the button 1 can be conveniently adjusted, and the use is flexible.

[0040] As Figures 2 to 9 shown, in this embodiment, the button 1 is circular, which is beneficial to improving the aesthetics of the button 1, but it is not limited to this. In other embodiments, buttons 1 of other shapes can also be used. A flange 12 is circumferentially provided on the edge of the button 1. The button 1 presses the compression spring 21, and the flange 12 abuts against the second step surface 32. By providing the flange 12, the other end of the elastic member 2 can be kept at the central position of the button 1, playing a limiting role on the other end of the elastic member 2 to prevent the button 1 from shifting relative to the elastic member 2 during the pressing process.

[0041] As Figure 2 shown, it further includes an outer housing 6. The inner housing 3 is arranged on the outer housing 6. The outer housing 6 is provided with a relief through hole at a position matching the button 1. The compression spring 21 pushes the flange 12 of the button 1 to abut against the outer housing 6 at the edge of the relief through hole. In this embodiment, when the button 1 is released, the compression spring 21 pushes the button 1 back to the initial position. Since the flange 12 is circumferentially provided on the edge of the button 1, the flange 12 abuts against the outer housing 6 at the edge of the relief through hole, ensuring the normal use of the button 1. The outer housing 6 of this embodiment can be installed on objects such as a shower handle and a toilet water tank that require an induction switch, which is convenient to use. Further, as Figure 2 and Figure 4 shown, a display screen 7 is also provided on the control board 5 of this embodiment for displaying various parameters such as switch information. Correspondingly, a relief hole 8 for the display screen 7 is provided on the outer housing 6. The user can also adjust the number of buttons 1 according to actual needs.

[0042] The use process of the present utility model is as follows:

[0043] When the button 1 is in the initial position, the button 1 is pushed by the other end of the compression spring 21, and the pressing block 11 will be in a suspended state. At this time, an air layer is formed between the pressing block 11 and the housing wall of the inner housing 3. When the user's hand is placed on the surface of the button 1, a micro-capacitor is formed with the conductive film layer 4 as the positive electrode of the capacitor, the housing wall of the inner housing 3 cooperating with the air layer and the pressing block 11 as the medium, and the hand as the negative electrode of the capacitor. Due to the presence of the air layer, the capacitance signal value is relatively weak. Therefore, the conductive film layer 4 will not generate a voltage difference signal, and the control board 5 will not trigger the switch.

[0044] After the user's hand presses the button 1, the pressing block 11 abuts against the housing wall of the inner housing 3, and a micro-capacitor is formed with the conductive film layer 4 as the positive electrode of the capacitor, the housing wall of the inner housing 3 cooperating with the pressing block 11 as the medium, and the hand as the negative electrode of the capacitor. Due to the lack of an air layer, the capacitance signal value will change. Therefore, the conductive film will generate a voltage difference signal, and the control board 5 will trigger the switch.

[0045] The orientation terms mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts and may therefore change accordingly depending on their different positions and usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0046] The above is only the preferred embodiment of the present utility model and does not limit the design of this case. Any equivalent changes made according to the key design of this case fall within the protection scope of this case.

Claims

1. A push-button capacitive induction switch, characterized in that: It includes a button, an elastic member, an inner housing, and a conductive film layer; The button is movably arranged on the housing wall on one side of the inner housing through the elastic member. The button is protruded with a pressing block, and the pressing block is suspended and movably abutted against the housing wall. The conductive film layer is tightly arranged on the housing wall on the other side of the inner housing corresponding to the pressing block; Press the button so that the pressing block abuts against the housing wall on one side of the inner housing through the elastic member, and a voltage difference signal is generated through the conductive film layer to trigger the switch.

2. The push-button capacitive induction switch according to claim 1, wherein: It further includes a control board, and the control board is arranged on the housing wall on the other side of the inner housing, and the conductive film layer is electrically connected and arranged on the control board.

3. The capacitive induction switch by pressing according to claim 1, wherein: The conductive film layer adopts a metal film layer.

4. The capacitive touch switch according to claim 1, characterized in that: A stepped surface is formed around the pressing block on one side of the inner housing. One end of the elastic member abuts against the stepped surface, and the other end of the elastic member abuts against the button.

5. The push-button capacitive induction switch according to claim 4, characterized in that: The pressing block is cylindrical, and the stepped surface is annular.

6. The capacitive induction switch of the pressing type according to claim 4, characterized in that: The stepped surface includes a first stepped surface and a second stepped surface. The height between the first stepped surface and the button is greater than the height between the second stepped surface and the button.

7. The capacitive touch switch according to claim 6, characterized in that: A drainage groove is formed on the inner housing, and the drainage groove extends to the first stepped surface and communicates with the first stepped surface.

8. The push-button capacitive induction switch according to claim 6, characterized in that: The elastic member is a compression spring. One end of the compression spring abuts against the first stepped surface, and the other end of the compression spring abuts against the button. The button squeezes the compression spring and abuts against the second stepped surface.

9. The capacitive touch switch according to claim 7, wherein: The button is circular, and a flange is circumferentially arranged on the edge of the button. The button squeezes the compression spring, and the flange abuts against the second stepped surface.

10. The capacitive touch switch according to claim 9, wherein: It further includes an outer housing. The inner housing is arranged on the outer housing. The outer housing is provided with a relief through hole at a position matching the button. The compression spring pushes the flange of the button to abut against the outer housing at the edge of the relief through hole.

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