A membrane switch adapted to high current environments

Abstract

The utility model discloses a kind of membrane switch suitable for high-current environment, including shell, the inner chamber of the shell is provided with PCBA, the top of the PCBA is provided with spring sheet layer, the spring sheet layer includes face key, the bottom of the face key is provided with fixed layer, the bottom of the fixed layer is provided with line key, the bottom of the line key is provided with spring piece, the top of the shell is provided with pressing portion, the top of the spring piece is provided with reset component for the homing of pressing portion, the utility model is improved design, increase voltage reducer converter on product line structure, in the case where external power supply condition input high current, after converter, make it to reach the current of membrane key small, can enhance membrane switch product application environment, application range increases, while increase product competitiveness, by setting reset component, successfully reset the effect of pressing portion is played, the safety of the contact passage of membrane switch is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of membrane switch technology, specifically a membrane switch adapted to high current environments. Background Technology

[0002] Membrane switches, also known as tactile keyboards, are plastic electronic products made of flexible materials such as PC, PVC, PET, FPC, and double-sided adhesive, using screen printing technology. They are multi-plane combined and sealed, integrating graphic, button, symbol display, conductivity, and electronic switching functions.

[0003] Existing membrane switches are typically designed to operate in low-current environments, with a maximum current limit of 100mA. This limitation makes traditional membrane switches inadequate for applications requiring high current. Therefore, we need to propose a membrane switch that can adapt to high-current environments. Utility Model Content

[0004] The purpose of this invention is to provide a membrane switch that is adapted to high current environments, in order to solve the problem that existing membrane switches are usually designed to work in low current environments, with their limit current often not exceeding 100mA. This limitation makes traditional membrane switches inadequate when facing high current demand applications.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A membrane switch adapted to high current environments includes a housing, an inner cavity of which a PCBA is disposed, a spring layer is disposed on the top of the PCBA, the spring layer includes a face key, a fixing layer is disposed at the bottom of the face key, a wire key is disposed at the bottom of the fixing layer, a spring is disposed at the bottom of the wire key, a pressing part is disposed on the top of the housing, a reset component for returning the pressing part to its original position is disposed on the top of the spring, a trigger block that cooperates with the spring is disposed on the top of the PCBA, a plastic fastener is disposed at the bottom of the PCBA, and a buck converter is disposed on the PCBA.

[0007] Preferably, the top of the outer casing is provided with a panel, the pressing part is provided on the top of the panel, and the pressing part is provided in an arc-shaped protrusion.

[0008] Preferably, the reset assembly includes a connecting post, the top of which is fixedly connected to the bottom of the pressing part, and a mounting shell is fixedly connected to the bottom of the connecting post. A reset spring is connected inside the mounting shell, and a sliding protrusion is fixedly connected to the bottom end of the reset spring.

[0009] Preferably, the bottom of the mounting shell is open, and the sliding protrusion is slidably connected to the inner cavity of the mounting shell.

[0010] Preferably, the top end of the return spring is fixedly connected to the inner top of the mounting housing, and the bottom end of the return spring is fixedly connected to the top of the sliding protrusion.

[0011] Preferably, the sliding protrusion is located above the trigger block, and the bottom of the sliding protrusion abuts against the top of the trigger block.

[0012] Preferably, the outer shell is a silicone shell, and the fixing layer is made of PET.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention improves the design by adding a step-down converter to the product circuit structure. When a high current is input from an external power supply, the current reaching the membrane key is reduced after passing through the converter. This enhances the application environment of the membrane switch, expands its applicability, and increases the product's competitiveness. By incorporating a reset component, the pressing part is smoothly reset, ensuring the safety of the membrane switch's contact path. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the outer shell of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the reset component of this utility model;

[0018] Figure 4 This is a schematic diagram of the assembly of the PCBA and the buck converter of this utility model.

[0019] In the diagram: 1. Outer shell; 2. PCBA; 3. Spring layer; 301. Face key; 302. Fixing layer; 303. Wire key; 304. Spring; 4. Pressing part; 5. Reset assembly; 501. Connecting post; 502. Mounting shell; 503. Reset spring; 504. Sliding protrusion; 6. Panel; 7. Plastic fastener; 8. Buck converter. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-4 This utility model provides a technical solution:

[0022] A membrane switch adaptable to high current environments includes a housing 1, a PCBA 2 disposed within the inner cavity of the housing 1, a spring layer 3 disposed on the top of the PCBA 2, the spring layer 3 including a face key 301, a fixing layer 302 disposed at the bottom of the face key 301, a wire key 303 disposed at the bottom of the fixing layer 302, a spring 304 disposed at the bottom of the wire key 303, a pressing part 4 disposed on the top of the housing 1, a reset component 5 disposed on the top of the spring 304 for returning the pressing part 4 to its original position, and a component 5 that cooperates with the spring 304 disposed on the top of the PCBA 2. The trigger block of the combined circuit is provided with a plastic buckle 7 at the bottom of PCBA2 and a step-down converter 8 on PCBA2. Through the improved design, the step-down converter 8 is added to the product circuit structure. When the external power supply inputs a high current, the current reaching the membrane button is reduced after passing through the step-down converter 8, which can enhance the application environment of the membrane switch product, expand its applicable range, and increase the product competitiveness. By setting the reset component 5, the pressing part 4 is successfully reset, ensuring the safety of the contact path of the membrane switch.

[0023] Specifically, the top of the outer shell 1 is provided with a panel 6, and a pressing part 4 is provided on the top of the panel 6. The pressing part 4 is provided in an arc shape and protrudes. The pressing part 4, the panel 6 and the outer shell 1 are integrally formed.

[0024] Furthermore, the reset assembly 5 includes a connecting post 501, the top of which is fixedly connected to the bottom of the pressing part 4, and a mounting shell 502 fixedly connected to the bottom of the connecting post 501. A reset spring 503 is connected inside the mounting shell 502, and a sliding protrusion 504 is fixedly connected to the bottom end of the reset spring 503. The bottom of the mounting shell 502 is open, and the sliding protrusion 504 is slidably connected to the inner cavity of the mounting shell 502.

[0025] The top end of the reset spring 503 is fixedly connected to the inner top of the mounting shell 502, and the bottom end of the reset spring 503 is fixedly connected to the top of the sliding protrusion 504. By setting the connecting post 501, the mounting shell 502, the reset spring 503 and the sliding protrusion 504 in cooperation, when the user presses the pressing part 4 down, the rebound force of the reset spring 503 can drive the connecting post 501 to move upward, thereby automatically returning the pressing part 4 to its original position, which plays the role of smoothly resetting the pressing part 4 and ensuring the safety of the contact path of the membrane switch.

[0026] The sliding bump 504 is located above the trigger block, and the bottom of the sliding bump 504 abuts against the top of the trigger block. The sliding bump and the trigger block are usually made of materials with good conductivity, such as metal or conductive plastic. This design can ensure that the switch can maintain stable conductivity under high current conditions and is not prone to open circuit or short circuit.

[0027] In addition, the outer shell 1 is made of silicone. The pressing part 4 and the panel 6 are made of the same material as the outer shell 1. Silicone is a material with excellent insulation properties. Its insulation resistance value is usually in the millions to hundreds of millions. It can effectively isolate the current conduction between the membrane switch and the external environment, thereby ensuring the safe operation of the membrane switch in a high current environment. The silicone shell 1 can resist the corrosion of various harsh environments, such as high temperature, humidity, salt spray, etc., thereby extending the service life of the membrane switch. The silicone shell 1 can form a tight sealing structure to prevent dust, moisture and other impurities from entering the membrane switch and affecting its performance. The fixing layer 302 is made of PET. PET material has good insulation and heat resistance properties. It can maintain stable performance in a high current environment and is not easily damaged by excessive current or high temperature.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A membrane switch adapted to high current environments, comprising a housing (1), characterized in that: The inner cavity of the outer shell (1) is provided with a PCBA (2). The top of the PCBA (2) is provided with a spring sheet layer (3). The spring sheet layer (3) includes a face key (301). The bottom of the face key (301) is provided with a fixing layer (302). The bottom of the fixing layer (302) is provided with a wire key (303). The bottom of the wire key (303) is provided with a spring sheet (304). The top of the outer shell (1) is provided with a pressing part (4). The top of the spring sheet (304) is provided with a reset component (5) for returning the pressing part (4) to its original position. The top of the PCBA (2) is provided with a trigger block that cooperates with the spring sheet (304). The bottom of the PCBA (2) is provided with a plastic fastener (7). The PCBA (2) is provided with a step-down converter (8).

2. A membrane switch adapted to high current environments according to claim 1, characterized in that: The top of the outer shell (1) is provided with a panel (6), and the pressing part (4) is provided on the top of the panel (6), and the pressing part (4) is provided in an arc-shaped protrusion.

3. A membrane switch adaptable to high current environments according to claim 1, characterized in that: The reset assembly (5) includes a connecting post (501), the top of which is fixedly connected to the bottom of the pressing part (4), and a mounting shell (502) is fixedly connected to the bottom of the connecting post (501). A reset spring (503) is connected inside the mounting shell (502), and a sliding protrusion (504) is fixedly connected to the bottom end of the reset spring (503).

4. A membrane switch adapted to high current environments according to claim 3, characterized in that: The bottom of the mounting shell (502) is open, and the sliding protrusion (504) is slidably connected to the inner cavity of the mounting shell (502).

5. A membrane switch adapted to high current environments according to claim 4, characterized in that: The top end of the return spring (503) is fixedly connected to the inner top of the mounting housing (502), and the bottom end of the return spring (503) is fixedly connected to the top of the sliding protrusion (504).

6. A membrane switch adapted to high current environments according to claim 5, characterized in that: The sliding protrusion (504) is located above the trigger block, and the bottom of the sliding protrusion (504) abuts against the top of the trigger block.

7. A membrane switch adapted to high current environments according to claim 1, characterized in that: The outer shell (1) is a silicone shell, and the fixing layer (302) is made of PET.

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