Capacitive touch switch

Abstract

The utility model discloses a capacitive touch switch which comprises a base and a cover plate, the base is fixedly connected with the cover plate in a detachable mode, the cover plate is provided with a touch panel, the base is provided with a control circuit and abuts against the touch panel, a first sealing ring is arranged between the touch panel and the cover plate, and a second sealing ring is arranged between the touch panel and the cover plate. An extending part is arranged at the bottom of the touch panel, a second sealing ring is arranged between the extending part and the base, and a third sealing ring is arranged at the position, abutting against the cover plate, of the base. External humid air and dust are prevented from entering the base and the cover plate through the first sealing ring, the second sealing ring and the third sealing ring, the control circuit is prevented from being affected with damp, the performance of electronic elements is prevented from being affected, even short circuit is avoided, accurate touch recognition is ensured, and therefore the technical problems proposed in the background technology are solved. And the product has the advantages of good sealing performance and prolonged service life.

Description

Technical Field

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

[0002] Capacitive touch switches are a type of touch switch that can accurately detect valid finger touches. They are waterproof and have strong anti-interference capabilities. At the same time, they do not require direct contact between the human body and metal, making them highly safe. They are widely used in factories, schools, and shopping malls as start and emergency stop switches.

[0003] Capacitive touch switches are sensitive to ambient humidity and dusty environments. High humidity and dust may cause inaccurate touch. Therefore, the applicant has made a useful design and found a way to solve the above problems. The technical solution to be introduced below is produced in this context. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the traditional capacitive touch switch design and provide a product with good sealing performance and extended service life.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A capacitive touch switch includes a base and a cover plate. The base is detachably connected and fixed to the cover plate. The cover plate is provided with a touch panel. The base is provided with a control circuit and abuts against the touch panel. A first sealing ring is provided between the touch panel and the cover plate. An extension is provided at the bottom of the touch panel. A second sealing ring is provided between the extension and the base. A third sealing ring is provided at the abutment of the base and the cover plate.

[0007] Preferably, the control circuit includes a control chip, an indicator light module, a power supply module, a capacitor, an amplifier module, a comparator module, and a switch. The indicator light module includes several LEDs evenly distributed around the control circuit. The power supply module is electrically connected to the indicator light module and the control chip. The control chip is electrically connected to the indicator light module, the capacitor, the amplifier module, the comparator module, and the switch. The capacitor is used to feed back the voltage change signal generated when a human body touches the touch panel to the control chip. The amplifier module is used to amplify the voltage change signal and feed it back to the control chip. The comparator module compares the voltage change signal to identify the signal and trigger the switch.

[0008] Preferably, the power module is provided with a pin socket, the second sealing ring is provided with a notch to accommodate the pin socket, a metal plate is provided above the control circuit and abuts against the touch panel, the metal plate is provided with a light-transmitting hole to accommodate the LED light, and a conductive element is provided between the metal plate and the control circuit.

[0009] Preferably, the cover plate has a plurality of first grooves evenly distributed around a dot as the axis, the cover plate has a first through hole for accommodating the touch panel, the inner wall of the first through hole has a second groove, and the first through hole has an inclined first guide portion.

[0010] Preferably, the base is provided with an abutting portion, the abutting portion is provided with a groove for accommodating the third sealing ring, and the abutting portion is provided with an inclined second guide portion that abuts against the first guide portion.

[0011] Preferably, the base has a second through hole that accommodates the pin socket, and the base has at least two elastic fasteners that are pressed into the first groove.

[0012] Preferably, the first sealing ring has an embedding portion and is embedded in the second groove.

[0013] Preferably, the detachable type is configured as a fastener.

[0014] Beneficial effects:

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention uses a first sealing ring, a second sealing ring, and a third sealing ring to prevent external humid air and dust from entering the base and cover plate, thus avoiding moisture damage to the control circuit, which could affect the performance of electronic components or even cause short circuits. This ensures accurate touch recognition and overcomes the technical problems mentioned in the background art, giving the product the advantages of good sealing and extended service life. Attached Figure Description

[0017] Figure 1 This is an exploded view of a capacitive touch switch according to the present invention.

[0018] Figure 2 This is a side cross-sectional view of a capacitive touch switch according to the present invention.

[0019] Figure 3 This utility model Figure 2 A partial enlarged view A of a capacitive touch switch;

[0020] Figure 4 This is a logic diagram of a capacitive touch switch according to the present invention;

[0021] Figure 5This is a circuit diagram of the control module for a capacitive touch switch according to the present invention.

[0022] Figure 6 This is a circuit diagram of an indicator light module for a capacitive touch switch according to the present invention.

[0023] Figure 7 This is a circuit diagram of the power supply module for a capacitive touch switch according to the present invention.

[0024] Figure 8 This is a circuit diagram of an amplifier module for a capacitive touch switch according to the present invention.

[0025] The correspondence between the labels and component names in the attached figures is as follows:

[0026] Reference numerals: 1. Base; 2. Cover plate; 3. Touch panel; 4. Control circuit; 5. First sealing ring; 6. Second sealing ring; 7. Third sealing ring; 8. Conductive component;

[0027] 11. Abutting part; 12. Settling groove; 13. Second guide part; 14. Second through hole; 15. Fastening block;

[0028] 21. First groove; 22. First through hole; 23. Second groove; 24. First guide portion;

[0029] 31. Extension section;

[0030] 41. Control chip; 42. Indicator light module; 43. Power supply module; 44. Capacitor; 45. Amplifier module; 46. Comparator module; 47. Switch; 48. Metal sheet;

[0031] 421. LED lights;

[0032] 431. Pin socket;

[0033] 481. Light-transmitting hole;

[0034] 51. Embedded part;

[0035] 61. Gap. Detailed Implementation

[0036] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] Reference example Figures 1 to 8 A capacitive touch switch includes a base 1 and a cover plate 2. The base 1 is detachably connected and fixed to the cover plate 2. The cover plate 2 is provided with a touch panel 3. The base 1 is provided with a control circuit 4 and abuts against the touch panel 3. A first sealing ring 5 is provided between the touch panel 3 and the cover plate 2. An extension 31 is provided at the bottom of the touch panel 3. A second sealing ring 6 is provided between the extension 31 and the base 1. A third sealing ring 7 is provided at the abutment of the base 1 and the cover plate 2. The first sealing ring 5, the second sealing ring 6, and the third sealing ring 7 prevent external humid air and dust from entering the base 1 and the cover plate 2, avoid the control circuit 4 from getting damp, affecting the performance of electronic components or even causing a short circuit, and ensure accurate touch recognition, thereby overcoming the technical problems proposed in the background art.

[0040] It is worth mentioning that the control circuit 4 includes a control chip 41, an indicator light module 42, a power supply module 43, a capacitor 44, an amplifier module 45, a comparator module 46, and a switch 47. The indicator light module 42 includes several LEDs 421, which are evenly distributed around the control circuit 4. The power supply module 43 is electrically connected to the indicator light module 42 and the control chip 41. The control chip 41 is electrically connected to the indicator light module 42, the capacitor 44, the amplifier module 45, the comparator module 46, and the switch 47. The capacitor 44 is used to feed back the voltage change signal generated when a human touches the touch panel 3 to the control chip 41. The amplifier module 45 is used to amplify the voltage change signal and feed it back to the control chip 41. The comparator module 46 compares the voltage change signal to identify the signal and trigger the switch 47.

[0041] See attached document Figure 5 To be continued Figure 8As shown, the touch panel 3 can be made of insulating plastic or glass. Under the condition that the surrounding environment remains unchanged, the capacitance between the touch panel 3 and the ground is a very small fixed value. There is also a capacitance between the human body and the ground. When a finger approaches and touches the touch panel 3, it is equivalent to the capacitance between the touch panel 3 and the ground being connected in parallel with the capacitance between the human body and the ground, thereby increasing the total capacitance. Due to the change in capacitance of capacitor 44, the voltage of capacitor 44 changes and is fed back to control chip 41. Amplifier module 45 amplifies the voltage signal and feeds it back to control chip 41. Control signal transmits the amplified voltage signal to comparator module 46. During the operation of control circuit 4, capacitor C6 of comparator module 46 is first charged to an initial voltage value. When the voltage is higher than the initial voltage value, U3 of comparator module outputs a high-level signal to control chip 41. Control chip 41 controls the on and off time of switch 47 through duty cycle. When switch 47 is turned on, multiple LEDs 421 run to indicate to the user that the capacitive touch switch is in the on state.

[0042] It is worth mentioning that the power module 43 is provided with a pin socket 431, the second sealing ring 6 is provided with a notch 61 that accommodates the pin socket 431, the control circuit 4 is provided with a metal plate 48 above it and abuts against the touch panel 3, the metal plate 48 is provided with a light-transmitting hole 481 that accommodates the LED light 421, and a conductive element 8 is provided between the metal plate 48 and the control circuit 4. Other electronic devices are electrically connected to the pin socket 431 through quick-connect plugs, which not only provide power to the power module 43, but also control the start and stop of electronic devices through the control circuit 4. The conductive element 8 is electrically connected to J1 and J2 of the amplifier module 45.

[0043] It is worth mentioning that the cover plate 2 is provided with several first grooves 21 evenly distributed around the dot as the axis. The cover plate 2 is provided with a first through hole 22 to accommodate the touch panel 3. The inner wall of the first through hole 22 is provided with a second groove 23. The first through hole 22 is provided with an inclined first guide part 24. The first groove 21 serves to accommodate the buckle block 15. The second groove 23 is used in conjunction with the first sealing ring 5. The first guide part 24 guides the cover plate 2 to be on the same axis as the base 1 when it is covered.

[0044] It is worth mentioning that the base 1 is provided with an abutment part 11, the abutment part 11 is provided with a groove 12 for accommodating the third sealing ring 7, the abutment part 11 is provided with an inclined second guide part 13, and abuts against the first guide part 24. Through the first guide part 24 and the second guide part 13, not only does it play a guiding role, but it also speeds up the assembly speed when the box lid is made.

[0045] It is worth mentioning that the base 1 is provided with a second through hole 14 that accommodates the pin socket 431. The base 1 is provided with at least two elastic fasteners 15, which are pressed against the first groove 21. The fasteners 15 connect and fix the base 1 to the cover plate 2. When the cover is closed, a clamping force is formed between the base 1 and the cover plate 2, which causes the third sealing ring 7 to be squeezed and deformed, filling the gap between the base 1 and the cover plate 2. This prevents humid air from entering between the first sealing ring 5 and the second sealing ring 6, and between the touch switch 47 and the base 1 and the cover plate 2, further increasing the sealing performance.

[0046] It is worth mentioning that the first sealing ring 5 is provided with an embedding part 51 and is embedded in the second groove 23. The embedding part 51 not only prevents dust from entering between the base 1 and the touch panel 3 along the gap, but also extends the entry of humid air into the interior of the base 1, further improving the sealing performance.

[0047] It is worth mentioning that the detachable design is provided by the buckle 15, which not only facilitates maintenance but also allows for quick assembly.

[0048] The above design scheme can enable the product to achieve the advantages of good sealing and extended service life.

[0049] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A capacitive touch switch, comprising a base (1) and a cover plate (2), wherein the base (1) is detachably connected and fixed to the cover plate (2), characterized in that: The cover plate (2) is provided with a touch panel (3), the base (1) is provided with a control circuit (4) and abuts against the touch panel (3), a first sealing ring (5) is provided between the touch panel (3) and the cover plate (2), an extension (31) is provided at the bottom of the touch panel (3), a second sealing ring (6) is provided between the extension (31) and the base (1), and a third sealing ring (7) is provided at the abutting part of the base (1) and the cover plate (2).

2. The capacitive touch switch according to claim 1, characterized in that: The control circuit (4) includes a control chip (41), an indicator light module (42), a power supply module (43), a capacitor (44), an amplifier module (45), a comparator module (46), and a switch (47). The indicator light module (42) includes several LEDs (421) evenly distributed around the control circuit (4). The power supply module (43) is electrically connected to the indicator light module (42) and the control chip (41). The control chip (41) is electrically connected to the indicator light module (42), the capacitor (44), the amplifier module (45), the comparator module (46), and the switch (47). The capacitor (44) is used to feed back the voltage change signal generated when the human body touches the touch panel (3) to the control chip (41). The amplifier module (45) is used to amplify the voltage change signal and feed it back to the control chip (41). The comparator module (46) compares the voltage change signal to identify the signal and trigger the switch (47).

3. The capacitive touch switch according to claim 2, characterized in that: The power module (43) is provided with a pin socket (431), the second sealing ring (6) is provided with a notch (61) to accommodate the pin socket (431), a metal plate (48) is provided above the control circuit (4) and abuts against the touch panel (3), the metal plate (48) is provided with a light-transmitting hole (481) to accommodate the LED light (421), and a conductive element (8) is provided between the metal plate (48) and the control circuit (4).

4. The capacitive touch switch according to claim 1, characterized in that: The cover plate (2) has a plurality of first grooves (21) evenly distributed around the dot as the axis. The cover plate (2) has a first through hole (22) for accommodating the touch panel (3). The inner wall of the first through hole (22) has a second groove (23). The first through hole (22) has an inclined first guide part (24).

5. The capacitive touch switch according to claim 3, characterized in that: The base (1) is provided with an abutment part (11), the abutment part (11) is provided with a groove (12) for accommodating the third sealing ring (7), the abutment part (11) is provided with an inclined second guide part (13), and abuts against the first guide part (24).

6. The capacitive touch switch according to claim 4, characterized in that: The base (1) is provided with a second through hole (14) that accommodates the pin socket (431), and the base (1) is provided with at least two elastic fasteners (15) that are fastened to the first groove (21).

7. The capacitive touch switch according to claim 4, characterized in that: The first sealing ring (5) has an insert (51) and is inserted into the second groove (23).

8. The capacitive touch switch according to any one of claims 2 to 7, characterized in that: The detachable type is configured as a fastener (15).

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