Membrane switch with short circuit prevention function

Abstract

The utility model relates to the technical field of membrane switches, and discloses a membrane switch with an anti-short-circuit function, which comprises a supporting seat, a button is slidably connected in the supporting seat, a pressing plate is fixedly connected to the lower surface of the button, a lower pressing block is attached to the lower surface of the pressing plate, a sliding rod is fixedly connected to the lower surface of the lower pressing block, and the sliding rod is fixedly connected to the lower surface of the sliding rod. The outer wall of the sliding rod is slidably connected with a base, the outer wall of the sliding rod is sleeved with a first spring, one end of the first spring is fixedly connected to the lower surface of the lower pressing block, and the other end of the first spring is fixedly connected to the upper surface of the base. According to the utility model, the problems of internal short circuit and shortening of the service life of equipment caused by slow response and incapability of rapid springback due to insufficient elasticity of the membrane switch are solved, and rapid springback of the button is achieved, so that the response speed and stability of the membrane switch can be improved, and the risk of short circuit is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane switches, in particular to a membrane switch with a short-circuit prevention function. Background Art

[0002] A membrane switch is an electronic switch that uses an elastic membrane as a button. It is usually composed of multiple layers of film materials, including a conductive layer, an insulating layer, and a conductive adhesive. When the button is pressed, the conductive layer contacts the elastic membrane to form a closed circuit, thereby realizing the switch function. However, in some environments, the membrane switch may have a short circuit problem. For example, when the membrane switch is exposed to moisture, it will cause contact between the conductive layers, causing a short circuit. Short circuits will not only affect the normal operation of the membrane switch, but may also cause circuit failures and even fires and other safety accidents. Therefore, a membrane switch with an anti-short circuit function is needed.

[0003] Traditional membrane switches are composed of multiple layers of film materials, including a base layer, a conductive layer, an insulating layer, and a cover layer. They are usually used for buttons or touch operation areas in electronic products. The steps of using traditional membrane switches include design, material selection, manufacturing, cutting, assembly, testing, and application. The design stage determines the pattern and layout of the switch, the material selection stage selects suitable high temperature and wear resistant materials, the manufacturing stage deposits or bonds the conductive layer and the insulating layer, the cutting stage cuts into individual buttons or touch areas according to the design pattern, the assembly stage pastes the membrane switch to the PCB board, the testing stage ensures that each button works properly, and the application stage applies the membrane switch to the final electronic product.

[0004] When the above-mentioned membrane switch is in use, due to the accumulation of various materials inside, the elasticity of the membrane switch is not sensitive enough, resulting in a slow response and an inability to rebound quickly, which can easily lead to an internal short circuit and shorten the service life of the device. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a membrane switch with an anti-short circuit function, aiming to improve the problem that the membrane switch is not elastic enough, resulting in a slow response and inability to rebound quickly, which in turn easily leads to an internal short circuit and shortens the service life of the equipment.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a membrane switch with an anti-short circuit function comprises a support seat, a button is slidably connected inside the support seat, a pressure plate is fixedly connected to the lower surface of the button, a lower pressure block is affixed to the lower surface of the pressure plate, a sliding rod is fixedly connected to the lower surface of the lower pressure block, an outer wall of the sliding rod is slidably connected to a base, a spring 1 is sleeved on the outer wall of the sliding rod, one end of the spring 1 is fixedly connected to the lower surface of the lower pressure block, and the other end of the spring 1 is fixedly connected to the upper surface of the base, a fixed support is fixedly connected to the lower surface of the support seat, the pressure plate and the outer wall of the fixed support are both fixedly connected to a guide rail, a slider is slidably connected to the outer wall of the guide rail, a guide rod is fixedly connected to the outer wall of the guide rail, the inner part of the slider is slidably connected to the outer wall of the guide rod, a spring 2 is sleeved on the outer wall of the guide rod, one end of the spring 2 is fixedly connected to the outer wall of the slider, and the other end of the spring 2 is fixedly connected to the outer wall of the guide rail, and a linkage component is arranged inside the slider.

[0007] Furthermore, the linkage assembly includes a scissor-type bracket, the outer wall of the scissor-type bracket is rotatably connected to the inside of the slider, the inside of the scissor-type bracket is rotatably connected to a rotating shaft, and the outer wall of the rotating shaft is slidably connected to the inner wall of the support seat.

[0008] Furthermore, a driving rod is fixedly connected to the lower surface of the pressing plate, and a contact piece is fixedly connected to the upper surface of the fixed support.

[0009] Furthermore, a sealing ring is slidably connected inside the support seat, and a push block is attached to the inner wall of the sealing ring.

[0010] Furthermore, a telescopic rod is fixedly connected to the outer wall of the push block, one end of the telescopic rod is fixedly connected to the inside of the support seat, and a spring three is sleeved on the outer wall of the telescopic rod.

[0011] Furthermore, one end of the spring three is fixedly connected to the inner wall of the support seat, and the other end of the spring three is fixedly connected to the outer wall of the push block.

[0012] Furthermore, a polycarbonate layer 1 is provided inside the support seat, and an insulating layer is provided inside the fixed support.

[0013] Furthermore, a circuit layer is disposed inside the insulating layer, and a second polycarbonate layer is disposed inside the insulating layer.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, when the button is pressed, the pressure plate is driven to apply pressure to the lower pressure block and the guide rail, and then the base and the slide bar are cooperated to shrink the spring 1, and then the scissor-type bracket is rotated by the movement of the guide rail, and finally the slider and the guide rod are cooperated to shrink the four springs 2 at the same time, so as to achieve a strong thrust to push the button back to its original position quickly, solving the problem that the elasticity of the membrane switch is not sensitive enough, resulting in slow response and inability to rebound quickly, thus causing internal short circuit and shortening the service life of the equipment, and achieving a quick rebound button, thereby improving the response speed and stability of the membrane switch and reducing the risk of short circuit.

[0016] 2. In the utility model, firstly, the spring three cooperates with the telescopic rod and the push block to push the sealing ring and the button to fit tightly, and then cooperates with the polycarbonate layer one and the polycarbonate layer two to prevent water from entering the interior of the membrane switch, thereby achieving waterproof treatment, thereby protecting the switch from moisture erosion, reducing circuit corrosion or short circuit caused by moisture entry, and thus extending the service life of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the membrane switch with anti-short circuit function proposed by the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the support base of the membrane switch with anti-short circuit function proposed by the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of one side of the base of the membrane switch with anti-short circuit function proposed by the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the upper part of the fixed support of the membrane switch with anti-short circuit function proposed by the utility model;

[0021] Figure 5 This is a schematic diagram of the support base structure of the membrane switch with short-circuit protection function proposed by the utility model.

[0022] Legend:

[0023] 1. Support seat; 2. Button; 3. Pressure plate; 4. Lower pressure block; 5. Base; 6. Sliding rod; 7. Spring 1; 8. Guide rail; 9. Sliding block; 10. Guide rod; 11. Spring 2; 12. Scissor-type bracket; 13. Rotating shaft; 14. Driving rod; 15. Contact piece; 16. Sealing ring; 17. Telescopic rod; 18. Spring 3; 19. Push block; 20. Fixed support; 21. Polycarbonate layer 1; 22. Insulating layer; 23. Circuit layer; 24. Polycarbonate layer 2. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figure 1 - Figure 3 The utility model provides an embodiment of a membrane switch with an anti-short circuit function, comprising a support seat 1, a button 2 is slidably connected inside the support seat 1, a pressure plate 3 is fixedly connected to the lower surface of the button 2, a lower pressure block 4 is attached to the lower surface of the pressure plate 3, a slide bar 6 is fixedly connected to the lower surface of the lower pressure block 4, a base 5 is slidably connected to the outer wall of the slide bar 6, a spring 7 is sleeved on the outer wall of the slide bar 6, one end of the spring 7 is fixedly connected to the lower surface of the lower pressure block 4, the other end of the spring 7 is fixedly connected to the upper surface of the base 5, a fixed support 20 is fixedly connected to the lower surface of the support seat 1, and the outer walls of the pressure plate 3 and the fixed support 20 are fixed A guide rail 8 is connected, a slider 9 is slidably connected to the outer wall of the guide rail 8, a guide rod 10 is fixedly connected to the outer wall of the guide rail 8, the inner part of the slider 9 is slidably connected to the outer wall of the guide rod 10, a spring 2 11 is sleeved on the outer wall of the guide rod 10, one end of the spring 2 11 is fixedly connected to the outer wall of the slider 9, and the other end of the spring 2 11 is fixedly connected to the outer wall of the guide rail 8, a linkage assembly is arranged inside the slider 9, and the linkage assembly includes a scissor-type bracket 12, the outer wall of the scissor-type bracket 12 is rotatably connected to the inner part of the slider 9, the inner part of the scissor-type bracket 12 is rotatably connected to a rotating shaft 13, and the outer wall of the rotating shaft 13 is slidably connected to the inner wall of the support seat 1;

[0026] Specifically, first, during the operation of the membrane switch, when the button 2 is pressed and subjected to an external force, the pressure plate 3 will be driven to slide inside the support seat 1. The movement of the pressure plate 3 will apply pressure to the lower pressure block 4 and the guide rail 8. As the pressure plate 3 moves, the lower pressure block 4 will be subjected to a downward force, thereby driving the slide bar 6 to slide inside the base 5. During this process, the spring 7 will contract, absorb and store the energy generated by the lower pressure block 4 and the slide bar 6. At the same time, the movement of the pressure plate 3 will also drive the upper guide rail 8 to move downward, and the downward movement of the guide rail 8 will further affect the The state of the scissor-type bracket 12 enables it to cross-move around the rotating shaft 13, driving the sliders 9 on both sides to slide on the outer wall of the guide rail 8, further ensuring the stability and smoothness of the entire structure. In this process, the spring 2 11 will also contract and store energy together with the spring 1 7. Finally, when the external force is removed, the spring 1 7 and the spring 2 11 will use their stored energy to rebound and quickly push the button 2 back to its original position, which not only ensures the sensitivity and reliability of the membrane switch, but also effectively prevents the risk of short circuit caused by accidental touch or prolonged pressing through the rebound effect of the spring.

[0027] Reference Figure 1 , Figure 4 and Figure 5 , a driving rod 14 is fixedly connected to the lower surface of the pressing plate 3, a contact piece 15 is fixedly connected to the upper surface of the fixed support 20, a sealing ring 16 is slidably connected to the interior of the support seat 1, a push block 19 is attached to the inner wall of the sealing ring 16, a telescopic rod 17 is fixedly connected to the outer wall of the push block 19, one end of the telescopic rod 17 is fixedly connected to the interior of the support seat 1, a spring three 18 is sleeved on the outer wall of the telescopic rod 17, one end of the spring three 18 is fixedly connected to the inner wall of the support seat 1, the other end of the spring three 18 is fixedly connected to the outer wall of the push block 19, a polycarbonate layer one 21 is arranged inside the support seat 1, an insulating layer 22 is arranged inside the fixed support 20, a circuit layer 23 is arranged inside the insulating layer 22, and a polycarbonate layer two 24 is arranged inside the insulating layer 22;

[0028] Specifically, during the movement of the button 2, friction will be applied on the outer wall of the sealing ring 16, which not only enhances the contact between the button 2 and the sealing ring 16, but also further improves the overall sealing of the device. During this process, the spring three 18 pushes the push block 19 by applying appropriate pressure, so that the push block 19 can fit tightly on the sealing ring 16, which not only ensures the seamless connection between the button 2 and the sealing ring 16, but also effectively prevents the intrusion of external moisture or impurities. In addition, a polycarbonate layer 21 is provided inside the support seat 1, which can effectively prevent moisture from penetrating into the interior of the device. At the same time, a polycarbonate layer 2 24 is also used on the bottom of the fixed support 20, thereby realizing efficient waterproof treatment of the bottom of the device and maintaining good waterproof performance.

[0029] Working principle: When a membrane switch with an anti-short circuit function is needed, first, when the button 2 is pressed, the button 2 drives the pressure plate 3 to slide inside the support seat 1, so that the movement of the pressure plate 3 exerts pressure on the lower pressure block 4 and the guide rail 8, and then the lower pressure block 4 drives the slide bar 6 to slide inside the base 5, so that the spring 1 7 is contracted, and the sleeve drives the upper guide rail 8 to move downward through the movement of the pressure plate 3, so that the scissor-type bracket 12 moves crosswise with the rotating shaft 13, and then drives the sliders 9 on both sides to slide on the outer wall of the guide rail 8, and at the same time, the spring 2 11 is contracted, and finally the button 2 is quickly pushed back to its original position through the rebound generated by the contraction of the spring 1 7 and the spring 2 11;

[0030] In addition, when the button 2 moves, it will rub against the outer wall of the sealing ring 16. At this time, the push block 19 is pushed by the spring three 18, thereby pushing the sealing ring 16 and the button 2 to fit tightly, thereby effectively sealing the connection, and cooperating with the polycarbonate layer one 21 inside the support seat 1 and the polycarbonate layer two 24 at the bottom of the fixed support 20 to achieve comprehensive and efficient waterproof treatment.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A membrane switch with short-circuit prevention function, comprising a support base (1), characterized in that: The support seat (1) is internally slidably connected with a button (2), the lower surface of the button (2) is fixedly connected with a pressure plate (3), the lower surface of the pressure plate (3) is fitted with a lower pressure block (4), the lower surface of the lower pressure block (4) is fixedly connected with a slide rod (6), the outer wall of the slide rod (6) is slidably connected with a base (5), the outer wall of the slide rod (6) is sleeved with a spring (7), one end of the spring (7) is fixedly connected to the lower surface of the lower pressure block (4), and the other end of the spring (7) is fixedly connected to the upper surface of the base (5), the lower surface of the support seat (1) is fixedly connected with a fixed support. The outer wall of the pressure plate (3) and the fixed support (20) are fixedly connected with a guide rail (8), the outer wall of the guide rail (8) is slidably connected with a slider (9), the outer wall of the guide rail (8) is fixedly connected with a guide rod (10), the interior of the slider (9) is slidably connected to the outer wall of the guide rod (10), the outer wall of the guide rod (10) is sleeved with a spring (11), one end of the spring (11) is fixedly connected to the outer wall of the slider (9), and the other end of the spring (11) is fixedly connected to the outer wall of the guide rail (8), and a linkage component is arranged inside the slider (9).

2. The membrane switch with short circuit prevention function according to claim 1, characterized in that: The linkage assembly comprises a scissor-type bracket (12), the outer wall of which is rotatably connected to the interior of the slider (9), the interior of the scissor-type bracket (12) is rotatably connected to a rotating shaft (13), and the outer wall of the rotating shaft (13) is slidably connected to the inner wall of the support seat (1).

3. The membrane switch with short circuit prevention function according to claim 1, characterized in that: The lower surface of the pressing plate (3) is fixedly connected to a driving rod (14), and the upper surface of the fixed support (20) is fixedly connected to a contact piece (15).

4. The membrane switch with short circuit prevention function according to claim 3, characterized in that: A sealing ring (16) is slidably connected inside the support seat (1), and a push block (19) is attached to the inner wall of the sealing ring (16).

5. The membrane switch with short circuit prevention function according to claim 4, characterized in that: The outer wall of the push block (19) is fixedly connected with a telescopic rod (17), one end of the telescopic rod (17) is fixedly connected to the inside of the support seat (1), and the outer wall of the telescopic rod (17) is sleeved with a spring three (18).

6. The membrane switch with short circuit prevention function according to claim 5, characterized in that: One end of the spring three (18) is fixedly connected to the inner wall of the support seat (1), and the other end of the spring three (18) is fixedly connected to the outer wall of the push block (19).

7. The membrane switch with short circuit prevention function according to claim 1, characterized in that: A polycarbonate layer (21) is provided inside the support seat (1), and an insulating layer (22) is provided inside the fixed support seat (20).

8. The membrane switch with short circuit prevention function according to claim 7, characterized in that: A circuit layer (23) is disposed inside the insulating layer (22), and a second polycarbonate layer (24) is disposed inside the insulating layer (22).

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