A high sensitivity membrane switch

Abstract

The utility model discloses a kind of high-sensitivity membrane switches, involve switch technical field, including upper shell, the lower part of upper shell is provided by lower shell, the inside of lower shell is provided with circuit board, the inside of upper shell is provided with rubber sheet, multiple pressing blocks are inlaid on rubber sheet, the bottom end middle part of pressing block is inlaid with conductive sheet, the lower surface both ends of conductive sheet are provided with protruding block, the upper surface of circuit board is provided with contact, the inside of pressing block is provided with cavity, the inside both ends of cavity are provided with rubber column, and rubber column mutually adhere to each other. The utility model is by setting cavity in pressing block, multiple rubber columns are set in cavity, multiple rubber columns mutually adhere to each other, when pressing degree is smaller, pressing block drives conductive sheet to move, and circuit conduction is completed by the cooperation of conductive sheet and contact, when pressing degree is larger, rubber column is extruded mutually, and pressing block is deformed, avoid that circuit board is damaged by the direct action of pressure on circuit board.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, and in particular to a highly sensitive membrane switch. Background Technology

[0002] Currently, membrane switches are integrated operating systems combining button functions, indicator elements, and instrument panels. They consist of four parts: a panel, an upper circuit, an isolation layer, and a lower circuit. When the membrane switch is pressed, the contacts of the upper circuit deform downwards, making contact with the plates of the lower circuit to conduct electricity. When the finger is released, the contacts of the upper circuit rebound, breaking the circuit and triggering a signal. Membrane switches have a robust structure, beautiful appearance, good sealing, moisture resistance, and long service life. They are widely used in electronic communication, electronic measurement instruments, industrial control, medical equipment, automotive industry, smart toys, and home appliances. Membrane switches, also known as tactile keyboards, employ a planar multi-layered integrated sealed structure. They are a new type of electronic component that integrates optics, mechanics, and electronics, sealing the button switch, panel, markings, symbol displays, and backing plate together. This represents a fundamental revolution in the appearance and structure of electronic products. They can replace conventional discrete button components and more reliably perform operating system tasks. However, most existing membrane switches are made of soft materials such as rubber. When the button is pressed, it is often difficult to trigger with insufficient pressure, while excessive pressure can damage the circuit board. Therefore, it is necessary to invent a highly sensitive thin-film switch to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a highly sensitive membrane switch to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a highly sensitive membrane switch, comprising an upper housing, a lower housing disposed below the upper housing, a circuit board disposed inside the lower housing, a rubber sheet disposed inside the upper housing, a plurality of through slots being formed at the top of the upper housing, the plurality of through slots being distributed in a rectangular array with equal spacing, a plurality of pressure blocks being embedded in the rubber sheet, the plurality of pressure blocks being distributed in a rectangular array with equal spacing, the pressure blocks penetrating through the through slots and extending to the top of the upper housing, a conductive sheet being embedded in the middle of the bottom end of the pressure block, protrusions being provided at both ends of the lower surface of the conductive sheet, contacts being provided on the upper surface of the circuit board, the contacts being perpendicularly corresponding to the positions of the protrusions, a cavity being formed inside the pressure block, rubber pillars being provided at both ends of the cavity, the rubber pillars being in contact with each other, and a plurality of anti-slip blocks being provided at the top of the pressure block, the plurality of anti-slip blocks being distributed in a ring array with equal spacing.

[0005] Preferably, the lower housing is internally fixedly connected with multiple positioning posts, which are distributed in an equally spaced rectangular array.

[0006] Preferably, both the circuit board and the rubber sheet have multiple positioning holes arranged in a rectangular array with equal spacing, and the positioning post passes through the positioning holes.

[0007] Preferably, a limiting block is provided in the middle of the positioning post, the limiting block is configured as a ring structure, and the limiting block is attached to the lower surface of the circuit board.

[0008] Preferably, a terminal block is provided at one end of the lower surface of the circuit board, a wire is provided on one side of the terminal block, and a through hole is provided on one side of the lower housing, through which the wire passes.

[0009] Preferably, the inner side of the lower housing is fixedly connected with a plurality of card blocks arranged in an equally spaced rectangular array, and a positioning block is provided on one side of the top of the card blocks. The inner side of the upper housing is provided with a plurality of positioning grooves that are adapted to the positioning blocks.

[0010] The technical effects and advantages of this utility model are as follows: 1. This utility model provides a cavity inside the pressure block, and multiple rubber pillars are placed inside the cavity. The multiple rubber pillars are in contact with each other. When the pressing force is small, the pressure block drives the conductive sheet to move. The conductive sheet cooperates with the contact to complete the circuit conduction. When the pressing force is large, the rubber pillars squeeze each other, and the pressure block deforms, thus avoiding the pressure from directly acting on the circuit board and causing damage to the circuit board. 2. This utility model provides multiple positioning posts inside the lower housing and multiple positioning holes on the rubber sheet and circuit board. The positioning holes cooperate with the positioning posts to fix the position between the circuit board and the rubber sheet, thus avoiding misalignment of the conductive sheet and the contacts from affecting the sensitivity of the switch. Attached Figure Description

[0011] Figure 1 This is a top view of the overall structure of this utility model.

[0012] Figure 2 This is a cross-sectional schematic diagram of the overall structure of this utility model.

[0013] Figure 3 This is a cross-sectional schematic diagram of the pressing block structure of this utility model.

[0014] Figure 4 For the present utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0015] In the diagram: 1. Upper housing; 2. Lower housing; 3. Circuit board; 4. Rubber sheet; 5. Through groove; 6. Pressure block; 7. Conductive sheet; 8. Protrusion; 9. Contact point; 10. Cavity; 11. Rubber pillar; 12. Anti-slip block; 13. Positioning pillar; 14. Positioning hole; 15. Limiting block; 16. Terminal block; 17. Wire; 18. Through hole; 19. Locking block; 20. Positioning block; 21. Positioning groove. Detailed Implementation

[0016] 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.

[0017] This utility model provides, for example Figure 1-4 A highly sensitive membrane switch is shown, such as Figure 1 and Figure 2 As shown, the device includes an upper housing 1, with a lower housing 2 located below it. Both the upper housing 1 and the lower housing 2 are made of insulating plastic. A circuit board 3 is installed inside the lower housing 2, and a rubber sheet 4 is installed inside the upper housing 1. Multiple through slots 5 are formed at the top of the upper housing 1, arranged in a rectangular array with equal spacing. Multiple pressure blocks 6 are embedded in the rubber sheet 4. Both the pressure blocks 6 and the rubber sheet 4 are soft, deformable materials, with the pressure blocks 6 having a higher hardness than the rubber sheet 4. The pressure blocks 6 penetrate the through slots 5 and extend to the top of the upper housing 1. Multiple positioning posts 13 are fixedly connected inside the lower housing 2, arranged in a rectangular array with equal spacing. Multiple equally spaced rectangular arrays are also formed on both the circuit board 3 and the rubber sheet 4. The positioning holes 14 are distributed, and the positioning posts 13 pass through the positioning holes 14. The positioning posts 13 cooperate with the positioning holes 14 to fix the position between the rubber sheet 4 and the circuit board 3, so as to avoid the misalignment of the conductive sheet 7 and the contact 9 from affecting the sensitivity of the switch. A limit block 15 is provided in the middle of the positioning post 13. The limit block 15 is set as a ring structure. The limit block 15 is attached to the lower surface of the circuit board 3. The limit block 15 supports the circuit board 3 and prevents the movement of the circuit board 3 from affecting the sensitivity of the switch when the pressure block 6 moves downward. A terminal block 16 is provided at one end of the lower surface of the circuit board 3. A wire 17 is provided on one side of the terminal block 16. The wire 17 and the terminal block 16 are used to connect the switch to the circuit. A through hole 18 is opened on one side of the lower housing 2, and the wire 17 passes through the through hole 18.

[0018] like Figure 3As shown, a conductive sheet 7 is embedded in the middle of the bottom end of the pressure block 6. Both ends of the lower surface of the conductive sheet 7 are provided with protrusions 8. The upper surface of the circuit board 3 is provided with contacts 9. The contacts 9 are perpendicular to the positions of the protrusions 8. When the protrusions 8 and contacts 9 are in contact, the circuit can be completed. A cavity 10 is opened inside the pressure block 6. Rubber pillars 11 are provided at both ends of the cavity 10. The rubber pillars 11 are in contact with each other. When the pressing pressure is large, the friction between the rubber pillars 11 cancels the pressure. The cavity 10 deforms, so that the kinetic energy is converted into potential energy, and the pressure is prevented from directly acting on the circuit board 3 and causing damage to the circuit board 3. Multiple anti-sliding blocks 12 are provided at the top of the pressure block 6. The multiple anti-sliding blocks 12 are distributed in a ring array with equal spacing.

[0019] like Figure 4 As shown, the inner side of the lower housing 2 is fixedly connected with a plurality of card blocks 19 arranged in an equally spaced rectangular array. A positioning block 20 is provided on one side of the top of the card block 19. The inner side of the upper housing 1 is provided with a plurality of positioning grooves 21 that are adapted to the positioning blocks 20. The positioning blocks 20 cooperate with the positioning grooves 21 to fix the position between the upper housing 1 and the lower housing 2.

[0020] Working principle of this utility model: When this device is in use, pressing the pressure block 6 with a small pressure causes the rubber pillars 11 inside the cavity 10 to rub against each other, keeping the cavity 10 unchanged. The pressure block 6 moves downward, and the connection between the pressure block 6 and the rubber sheet 4 deforms. The pressure block 6 drives the conductive sheet 7 downward, which in turn drives the protrusion 8 downward. The protrusion 8 contacts the contact point 9, and current flows through the protrusion 8 and the conductive sheet 7 to complete the signal conduction. When the button is released, the rubber sheet 4 returns to its original position, and the rubber sheet 4 drives the pressure block 6 to return to its original position. When the pressure is large... After the protrusion 8 and the contact 9 are in contact, the rubber column 11 is subjected to pressure and undergoes relative displacement, and the cavity 10 deforms, converting kinetic energy into potential energy, thus preventing the circuit board 3 from being damaged by pressure. When the circuit board 3 needs to be repaired, the lower housing 2 and the upper housing 1 are connected by the positioning block 20 and the positioning groove 21. By moving the upper housing 1 and the lower housing 2, the positioning block 20 is deformed, which releases the limit between the upper housing 1 and the lower housing 2, allowing the upper housing 1 and the lower housing 2 to be separated for the circuit board 3 to be repaired.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A highly sensitive membrane switch, comprising an upper housing (1), characterized in that: Below the upper housing (1) is a lower housing (2), inside which is a circuit board (3). Inside the upper housing (1) is a rubber sheet (4). The top of the upper housing (1) has multiple through slots (5) arranged in an equally spaced rectangular array. Multiple pressure blocks (6) are embedded in the rubber sheet (4) arranged in an equally spaced rectangular array. The pressure blocks (6) penetrate the through slots (5) and extend to the top of the upper housing (1). The bottom of the pressure block (6) A conductive sheet (7) is embedded in the middle of the end. Both ends of the lower surface of the conductive sheet (7) are provided with protrusions (8). The upper surface of the circuit board (3) is provided with a contact point (9). The contact point (9) is perpendicular to the position of the protrusion (8). A cavity (10) is opened inside the pressure block (6). Both ends of the cavity (10) are provided with rubber pillars (11). The rubber pillars (11) are in contact with each other. Multiple anti-sliding blocks (12) are provided at the top of the pressure block (6). The multiple anti-sliding blocks (12) are distributed in a ring array with equal spacing.

2. The highly sensitive membrane switch according to claim 1, characterized in that: The lower housing (2) is internally fixedly connected to a plurality of positioning posts (13), which are distributed in an equally spaced rectangular array.

3. A highly sensitive membrane switch according to claim 2, characterized in that: The circuit board (3) and the rubber sheet (4) are provided with multiple positioning holes (14) arranged in a rectangular array with equal spacing, and the positioning post (13) passes through the positioning hole (14).

4. A highly sensitive membrane switch according to claim 3, characterized in that: A limiting block (15) is provided in the middle of the positioning post (13). The limiting block (15) is set as a ring structure and is attached to the lower surface of the circuit board (3).

5. A highly sensitive membrane switch according to claim 4, characterized in that: A wiring board (16) is provided on one end of the lower surface of the circuit board (3), and a wire (17) is provided on one side of the wiring board (16). A through hole (18) is provided on one side of the lower housing (2), and the wire (17) passes through the through hole (18).

6. A highly sensitive membrane switch according to claim 5, characterized in that: The inner side of the lower housing (2) is fixedly connected with a plurality of card blocks (19) arranged in an equally spaced rectangular array. A positioning block (20) is provided on one side of the top of the card block (19). The inner side of the upper housing (1) is provided with a plurality of positioning grooves (21) that are adapted to the positioning block (20).

Images