False contact prevention circuit, PCB and touch button
By employing a dual confirmation mechanism that combines button sensing and invisible light sensing, the problem of accidental touches in capacitive touch sensing in humid environments has been solved, achieving stable and reliable operation of touch buttons and improving the user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-03
AI Technical Summary
Existing capacitive touch sensing technology is prone to accidental touches in humid environments, leading to user confusion and device malfunctions, reducing the user experience and posing safety hazards.
A dual confirmation mechanism is adopted, combining a button sensing unit and an invisible light sensing unit. The button sensing unit detects the user's direct contact, while the invisible light sensing unit detects gestures or proximity actions. The operation is confirmed only when both provide feedback signals simultaneously, reducing the possibility of accidental touches.
It significantly reduces the possibility of accidental touches, improves the stability and reliability of touch buttons, reduces unnecessary responses or interference, and enhances user experience and device reliability.
Smart Images
Figure CN223966896U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of touch sensing technology, and in particular to an anti-accidental touch circuit, PCB board and touch button. Background Technology
[0002] While capacitive touch sensing technology provides great convenience and a sensitive interactive experience in our daily lives, it often encounters some tricky challenges when facing humid environments.
[0003] For example, in a bathroom, when the surface of a touch button gets wet, it may cause annoying malfunctions. This is because water, as a conductor, inevitably changes the electric field distribution on the surface of the touch button, causing it to fail to accurately recognize the user's touch operation. Specifically, the presence of water droplets may simulate additional touch points or interfere with the recognition of existing touch points, causing the touch button to respond incorrectly to the user's operation. Such malfunctions not only confuse and inconvenience users, but also greatly reduce the user experience and may even lead to the mis-triggering of device functions, causing unnecessary trouble and safety hazards.
[0004] It is evident that existing technologies still need improvement and enhancement. Utility Model Content
[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an anti-accidental touch circuit that adopts a dual confirmation mechanism, which significantly reduces the possibility of accidental touch and reduces unnecessary responses or interference caused by misoperation.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] An anti-accidental touch circuit includes a button sensing unit, an invisible light sensing unit, a sensing signal processing unit, and a communication unit. The output terminals of the button sensing unit and the invisible light sensing unit are respectively connected to the input terminal of the sensing signal processing unit. The output terminal of the sensing signal processing unit is connected to the input terminal of the communication unit. The communication unit is used to realize information interaction between the sensing signal processing unit and external devices.
[0008] In the aforementioned anti-accidental touch circuit, the sensing signal processing unit includes a first control chip U1. The output terminal of the button sensing unit is connected to pins TOUCH0, TOUCH1, 18, and 19 of the first control chip U1, respectively. The output terminal of the invisible light sensing unit is connected to pins U117 and U116 of the first control chip U1, respectively. The pins OUT1, OUT2, RX, TX, CK, and DA of the first control chip are connected to the input terminal of the communication unit, respectively.
[0009] In the aforementioned anti-accidental touch circuit, the button sensing unit includes a button section and a capacitive sensing section. The output terminal of the button section is connected to pins TOUCH0 and TOUCH1 of the first control chip U1, respectively. The output terminal of the capacitive sensing section is connected to pins 18 and 19 of the first control chip U1, respectively.
[0010] In the aforementioned anti-accidental touch circuit, the button section includes a first button group and a second button group. The output terminal of the first button group is connected to the TOUCH0 pin of the first control chip, and the output terminal of the second button group is connected to the TOUCH1 pin of the first control chip U1.
[0011] In the aforementioned anti-accidental touch circuit, the invisible light sensing unit includes a first isolation section and a second isolation section. The input terminals of the first isolation section and the second isolation section are respectively used to receive infrared signals fed back by the infrared receiving tube. The output terminal of the first isolation section is connected to pin U117 of the first control chip U1, and the output terminal of the second isolation section is connected to pin U116 of the first control chip U1.
[0012] In the aforementioned anti-accidental touch circuit, the first isolation section includes a second optocoupler U2, a thirty-sixth resistor R36, and a thirty-seventh resistor R37; the second isolation section includes a third optocoupler U3, a thirty-ninth resistor R39, and a fortieth resistor R40; the transmitting ends of the second optocoupler U2 and the third optocoupler U3 are respectively used to receive infrared signals fed back by the infrared receiving tube; pin 3 of the receiving end of the second optocoupler U2 is connected to one end of the thirty-sixth resistor R36, the other end of the thirty-sixth resistor R36 and one end of the thirty-seventh resistor R37 are respectively connected to pin U117 of the first control chip U1, and the other end of the thirty-seventh resistor R37 is used to connect to an external power supply device; pin 3 of the receiving end of the third optocoupler U3 is connected to one end of the thirty-ninth resistor R39, the other end of the thirty-ninth resistor R39 and one end of the fortieth resistor R40 are respectively connected to pin U116 of the first control chip U1, and the other end of the fortieth resistor R40 is used to connect to an external power supply device.
[0013] In the aforementioned anti-accidental touch circuit, the communication unit includes a first connector P1, a second connector P2, and a third connector P3. Pins 3 and 4 of the first connector P1 are respectively connected to pins DA and CK of the first control chip U1; pins 3 and 4 of the second connector P2 are respectively connected to pins RX and TX of the first control chip U1; and pins 1 and 2 of the third connector P3 are respectively connected to pins OUT1 and OUT2 of the first control chip U1.
[0014] This utility model also provides a PCB board, on which the anti-accidental touch circuit as described above is printed.
[0015] This utility model also provides a touch button, which includes a housing, a capacitive sensor, an invisible light sensing mechanism, and a PCB board as described above; a spring support mechanism is provided inside the housing, a trigger button is provided on the top of the housing, the spring support mechanism is located directly below the trigger button, the capacitive sensor is located inside the spring support mechanism, the invisible light sensing mechanism is provided on the side of the housing, and the top surface of the invisible light sensing mechanism is located below the top surface of the spring support mechanism.
[0016] In the aforementioned touch button, the invisible light sensing mechanism includes two infrared receivers and an infrared emitter. The two infrared receivers are disposed on the left inner wall of the housing, and the infrared emitter is disposed on the right inner wall of the housing. The infrared receivers and the infrared emitter are located at the same height, and the angle between the line connecting the infrared emitter and the infrared receiver and the side of the housing is 45°. The top surfaces of the infrared receivers and the infrared emitter are respectively located below the top surface of the spring support mechanism.
[0017] Beneficial effects:
[0018] This invention provides an anti-accidental touch circuit. A button sensing unit and an invisible light sensing unit work together to provide input signals to a sensing signal processing unit. The button sensing unit detects direct contact between the user and the physical button, accurately identifying the user's touch action. The invisible light sensing unit uses infrared light or other invisible spectra to detect the user's gestures or proximity actions. Only when both the button sensing unit and the invisible light sensing unit simultaneously send feedback signals to the sensing signal processing unit is the user's actual operation confirmed. This dual confirmation mechanism significantly reduces the possibility of accidental touches, improves the stability and reliability of the touch button during operation, and reduces unnecessary responses or interference caused by misoperation. Attached Figure Description
[0019] Figure 1 A circuit block diagram of the anti-accidental touch circuit provided by this utility model;
[0020] Figure 2 The circuit diagram of the communication unit and the sensing signal processing unit of the anti-accidental touch circuit provided by this utility model;
[0021] Figure 3 The circuit diagram of the button sensing unit provided by this utility model;
[0022] Figure 4 The circuit diagram of the invisible light sensing unit provided by this utility model;
[0023] Figure 5 A schematic diagram of the spring support mechanism and capacitive sensing element provided by this utility model;
[0024] Explanation of main component symbols: 1-Button sensing unit, 11-Button part, 12-Capacitive sensing part, 2-Invisible light sensing unit, 21-First isolation part, 22-Second isolation part, 3-Sensing signal processing unit, 4-Communication unit, 51-Top plate, 52-Bottom plate, 521-Fixing base, 53-Spring, 6-Limit block. Detailed Implementation
[0025] This utility model provides an anti-accidental touch circuit, a PCB board 2, and a touch button. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples.
[0026] In the description of this utility model, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0027] Please see Figures 1 to 4 This utility model provides an anti-accidental touch circuit, including a button sensing unit 1, an invisible light sensing unit 2, a sensing signal processing unit 3, and a communication unit 4. The output terminals of the button sensing unit 1 and the invisible light sensing unit 2 are respectively connected to the input terminal of the sensing signal processing unit 3. The output terminal of the sensing signal processing unit 3 is connected to the input terminal of the communication unit 4. The communication unit 4 is used to realize information interaction between the sensing signal processing unit 3 and external devices.
[0028] The anti-accidental touch circuit disclosed in this utility model has a button sensing unit 1 and an invisible light sensing unit 2 working together to provide input signals to a sensing signal processing unit 3. The button sensing unit 1 is responsible for detecting the user's direct contact with the physical button and can accurately identify the user's contact action. The invisible light sensing unit 2 uses the characteristics of infrared light or other invisible spectra to detect the user's gestures or proximity actions. Only when both sensing units simultaneously feed back sensing signals to the sensing signal processing unit 3 will it be confirmed as the user's actual operation. This dual confirmation mechanism significantly reduces the possibility of accidental touch, improves the stability and reliability of the touch button during operation, and reduces unnecessary responses or interference caused by misoperation.
[0029] Further, please refer to Figure 2 The sensing signal processing unit 3 includes a first control chip U1. The output terminal of the button sensing unit 1 is connected to pins TOUCH0, TOUCH1, 18 and 19 of the first control chip U1, respectively. The output terminal of the invisible light sensing unit 2 is connected to pins U117 and U116 of the first control chip U1, respectively. The pins OUT1, OUT2, RX, TX, CK and DA of the first control chip are connected to the input terminal of the communication unit 4, respectively.
[0030] In this embodiment, the first control chip U1 is model SC09B.
[0031] Further, please refer to Figure 1 and Figure 3 The button sensing unit 1 includes a button part 11 and a capacitive sensing part 12. The output terminal of the button part 11 is connected to pin TOUCH0 and pin TOUCH1 of the first control chip U1, respectively. The output terminal of the capacitive sensing part 12 is connected to pin 18 and pin 19 of the first control chip U1, respectively.
[0032] In this embodiment, the capacitive sensing unit 12 includes an existing capacitive sensing chip. Capacitive sensing elements for sensing proximity touch actions are respectively provided directly below the two trigger buttons included in the two button groups. The two capacitive sensing elements are connected to pins 18 and 19 of the first control chip U1 through the capacitive sensing chip.
[0033] Further, please refer to Figure 3 The button section 11 includes a first button group and a second button group. The output terminal of the first button group is connected to the TOUCH0 pin of the first control chip through the forty-fourth resistor R44, and the output terminal of the second button group is connected to the TOUCH1 pin of the first control chip U1 through the forty-third resistor R43.
[0034] In this embodiment, the button sensing unit 1 combines the button part 11 and the capacitive sensing part 12, which improves the sensitivity and accuracy of button operation. The button part 11 is directly connected to a specific pin of the first control chip U1, ensuring that the button signal can be transmitted to the first control chip U1 quickly and stably, thereby improving the response speed of the circuit. Secondly, the introduction of the capacitive sensing part 12 enables the button sensing unit 1 to sense proximity touch actions, rather than just the pressing of physical buttons. This non-contact sensing method not only improves the user experience, but also increases the durability and lifespan of the device by reducing the wear and tear on physical buttons.
[0035] Further, please refer to Figure 1 and Figure 4 The invisible light sensing unit 2 includes a first isolation section 21 and a second isolation section 22. The input terminals of the first isolation section 21 and the second isolation section 22 are respectively used to receive infrared signals fed back by the infrared receiving tube. The output terminal of the first isolation section 21 is connected to pin U117 of the first control chip U1, and the output terminal of the second isolation section 22 is connected to pin U116 of the first control chip U1.
[0036] Further, please refer to Figure 4 The first isolation section 21 includes a second optocoupler U2, a thirty-sixth resistor R36, and a thirty-seventh resistor R37. The second isolation section 22 includes a third optocoupler U3, a thirty-ninth resistor R39, and a fortieth resistor R40. The transmitting ends of the second optocoupler U2 and the third optocoupler U3 are respectively used to receive infrared signals fed back by the infrared receiving tube. Pin 3 of the receiving end of the second optocoupler U2 is connected to one end of the thirty-sixth resistor R36. The other end of the thirty-sixth resistor R36 and one end of the thirty-seventh resistor R37 are respectively connected to pin U117 of the first control chip U1. The other end of the thirty-seventh resistor R37 is used to connect to an external power supply device. Pin 3 of the receiving end of the third optocoupler U3 is connected to one end of the thirty-ninth resistor R39. The other end of the thirty-ninth resistor R39 and one end of the fortieth resistor R40 are respectively connected to pin U116 of the first control chip U1. The other end of the fortieth resistor R40 is used to connect to an external power supply device.
[0037] In this embodiment, the invisible light sensing unit 2 independently receives the infrared signal fed back by the infrared receiving tube through the first isolation section 21 and the second isolation section 22, ensuring accurate signal transmission and processing. The first isolation section 21 and the second isolation section 22 are respectively connected to the corresponding pins of the first control chip U1 through a combination of optocouplers and resistors. This structure not only improves the isolation and anti-interference ability of the signal, but also effectively protects the control chip from direct interference from external signals. At the same time, the setting of resistors R36, R37, R39, and R40 not only provides the necessary current limit for the optocoupler, but also facilitates the optimization of signal transmission characteristics by adjusting the resistance value.
[0038] Further, please refer to Figure 1 and Figure 2 The communication unit 4 includes a first connector P1, a second connector P2, and a third connector P3. Pins 3 and 4 of the first connector P1 are respectively connected to pins DA and CK of the first control chip U1. Pins 3 and 4 of the second connector P2 are respectively connected to pins RX and TX of the first control chip U1. Pins 1 and 2 of the third connector P3 are respectively connected to pins OUT1 and OUT2 of the first control chip U1.
[0039] In this embodiment, both the first connector P1 and the second connector P2 are 4-pin header interfaces. The first connector P1 is marked with pins such as DA and CK, which can be used for digital-to-analog conversion and clock signal transmission to realize some internal function control of the first control chip U1. The second connector P2 is marked with pins RX, TX, 3.3V, and GND, which can be used for serial communication to connect external devices for data transmission. 3.3V provides the working voltage for the interface, and GND is the ground pin to ensure the stability of the electrical connection. The third connector P3 is model Z-211-0211-0021-001, which can be used to output the control model of the first control chip U1, such as outputting the corresponding control model according to the button triggering situation or controlling the working state of the infrared emitter.
[0040] This utility model also provides a PCB board, on which the anti-accidental touch circuit as described above is printed.
[0041] Please see Figure 5The present invention also provides a touch button, which includes a housing, a capacitive sensor, an invisible light sensing mechanism, and a PCB board as described above. A spring 53 support mechanism is provided inside the housing, and a trigger button is provided on the top of the housing. The spring 53 support mechanism is located directly below the trigger button. The capacitive sensor is located inside the spring 53 support mechanism. The invisible light sensing mechanism is located on the side of the housing, and the top surface of the invisible light sensing mechanism is located below the top surface of the spring 53 support mechanism.
[0042] Further, please refer to Figure 5 The spring 53 support mechanism includes a top plate 51, a bottom plate 52, and a spring 53. The PCB board is fixed on the bottom plate 52, and a fixing seat 521 is provided on the bottom plate 52. One end of the spring 53 is fixedly connected to the top plate 51, and the top plate 51 is located directly below the trigger button. The other end of the spring 53 is fixedly connected to the bottom plate 52 and is located inside the fixing seat 521. The capacitive sensor is located inside the fixing seat 521, and the center point of the capacitive sensor and the center point of the trigger button are located on the same vertical line.
[0043] In this embodiment, firstly, the coordinated action of the top plate 51, the bottom plate 52, and the spring 53 achieves stable support and elastic feedback for the trigger button. When the trigger button is pressed, the spring 53 absorbs and buffers the impact force of the button, ensuring smooth and comfortable button operation. Simultaneously, the elastic restoring force of the spring 53 ensures that the button quickly returns to its initial position after release, improving the response speed and accuracy of user operation. Secondly, by providing a fixing seat 521 on the bottom plate 52, and fixing one end of the spring 53 to the top plate 51 and the other end to the bottom plate 52 within the fixing seat 521, a spring-like... The precise positioning and stable installation of the spring 53 support mechanism not only improves the stability and reliability of the spring 53 support mechanism, but also helps to reduce the loosening and wear of the button during long-term use, thus extending the product's service life. In addition, by placing the capacitive sensing element inside the fixed base 521 and ensuring that its center point is on the same vertical line as the center point of the trigger button, precise sensing and recognition of button actions are achieved. This design improves the sensitivity and accuracy of the button, ensures the precision and reliability of user operation, and avoids the wear and failure problems of traditional mechanical buttons, thereby improving the product's durability and stability.
[0044] Further, please refer to Figure 5Limiting blocks 6 are respectively provided on both sides of the top plate 51 and both sides of the bottom plate 52. Limiting strips are respectively provided on the inner walls of both sides of the housing. Limiting grooves are formed in the limiting strips. The limiting blocks 6 on both sides are respectively connected to the limiting grooves on both sides. By setting the limiting blocks 6 and the limiting grooves to cooperate, the shaking or displacement of the top plate 51 or the bottom plate 52 in the housing can be effectively prevented, thereby improving the stability and reliability of the entire structure. It also ensures that the trigger button moves up and down in the vertical direction, thereby improving the accuracy and reliability of the sensing results output by the capacitive sensing element.
[0045] Furthermore, the invisible light sensing mechanism includes two infrared receivers and an infrared emitter. The two infrared receivers are disposed on the left inner wall of the housing, and the infrared emitter is disposed on the right inner wall of the housing. The infrared receivers and the infrared emitter are located at the same height, and the angle between the line connecting the infrared emitter and the infrared receiver and the side of the housing is 45°. The top surfaces of the infrared receivers and the infrared emitter are respectively located below the top surface of the spring 53 support mechanism.
[0046] In this embodiment, firstly, the layout of two infrared receivers and an infrared emitter enables effective detection of user gestures or proximity actions. The infrared emitter emits infrared light, while the infrared receiver receives the reflected infrared light. When the user's hand enters the sensing range, it blocks or reflects the infrared light, thereby triggering the corresponding detection mechanism. Secondly, the infrared receiver and the infrared emitter are located at the same height, and the angle between the line connecting them and the side of the housing is 45°. This design optimizes the sensing range and sensitivity. Specifically, the 45° angle allows the emitted infrared light to cover a truncated cone-shaped space above the touch button, ensuring that objects obstructing the touch button within a certain distance can be effectively detected, thus improving the accuracy and reliability of the detection.
[0047] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.
Claims
1. A circuit for preventing accidental touches, characterized in that, It includes a button sensing unit, an invisible light sensing unit, a sensing signal processing unit, and a communication unit. The output terminals of the button sensing unit and the invisible light sensing unit are respectively connected to the input terminal of the sensing signal processing unit. The output terminal of the sensing signal processing unit is connected to the input terminal of the communication unit. The communication unit is used to realize information interaction between the sensing signal processing unit and external devices.
2. The anti-accidental touch circuit according to claim 1, characterized in that, The sensing signal processing unit includes a first control chip U1. The output terminal of the button sensing unit is connected to pins TOUCH0, TOUCH1, 18, and 19 of the first control chip U1, respectively. The output terminal of the invisible light sensing unit is connected to pins U117 and U116 of the first control chip U1, respectively. The pins OUT1, OUT2, RX, TX, CK, and DA of the first control chip are connected to the input terminal of the communication unit, respectively.
3. The anti-accidental touch circuit according to claim 2, characterized in that, The button sensing unit includes a button section and a capacitive sensing section. The output terminal of the button section is connected to pin TOUCH0 and pin TOUCH1 of the first control chip U1, respectively. The output terminal of the capacitive sensing section is connected to pin 18 and pin 19 of the first control chip U1, respectively.
4. The anti-accidental touch circuit according to claim 3, characterized in that, The button section includes a first button group and a second button group. The output terminal of the first button group is connected to the TOUCH0 pin of the first control chip, and the output terminal of the second button group is connected to the TOUCH1 pin of the first control chip U1.
5. The anti-accidental touch circuit according to claim 2, characterized in that, The invisible light sensing unit includes a first isolation section and a second isolation section. The input terminals of the first isolation section and the second isolation section are respectively used to receive infrared signals fed back by the infrared receiving tube. The output terminal of the first isolation section is connected to pin U117 of the first control chip U1, and the output terminal of the second isolation section is connected to pin U116 of the first control chip U1.
6. The anti-accidental touch circuit according to claim 5, characterized in that, The first isolation section includes a second optocoupler U2, a thirty-sixth resistor R36, and a thirty-seventh resistor R37. The second isolation section includes a third optocoupler U3, a thirty-ninth resistor R39, and a fortieth resistor R40. The transmitting ends of the second optocoupler U2 and the third optocoupler U3 are respectively used to receive infrared signals fed back by the infrared receiving tube. Pin 3 of the receiving end of the second optocoupler U2 is connected to one end of the thirty-sixth resistor R36. The other end of the thirty-sixth resistor R36 and one end of the thirty-seventh resistor R37 are respectively connected to pin U117 of the first control chip U1. The other end of the thirty-seventh resistor R37 is used to connect to an external power supply device. Pin 3 of the receiving end of the third optocoupler U3 is connected to one end of the thirty-ninth resistor R39. The other end of the thirty-ninth resistor R39 and one end of the fortieth resistor R40 are respectively connected to pin U116 of the first control chip U1. The other end of the fortieth resistor R40 is used to connect to an external power supply device.
7. The anti-accidental touch circuit according to claim 2, characterized in that, The communication unit includes a first connector P1, a second connector P2, and a third connector P3. Pins 3 and 4 of the first connector P1 are respectively connected to pins DA and CK of the first control chip U1. Pins 3 and 4 of the second connector P2 are respectively connected to pins RX and TX of the first control chip U1. Pins 1 and 2 of the third connector P3 are respectively connected to pins OUT1 and OUT2 of the first control chip U1.
8. A PCB board, characterized in that, The PCB board is printed with an anti-accidental touch circuit as described in any one of claims 1-7.
9. A touch button, characterized in that, The device includes a housing, a capacitive sensor, an invisible light sensing mechanism, and a PCB board as described in claim 8. A spring support mechanism is provided inside the housing, a trigger button is provided on the top of the housing, the spring support mechanism is located directly below the trigger button, the capacitive sensor is located inside the spring support mechanism, the invisible light sensing mechanism is provided on the side of the housing, and the top surface of the invisible light sensing mechanism is located below the top surface of the spring support mechanism.
10. The touch button according to claim 9, characterized in that, The invisible light sensing mechanism includes two infrared receivers and an infrared emitter. The two infrared receivers are disposed on the left inner wall of the housing, and the infrared emitter is disposed on the right inner wall of the housing. The infrared receivers and the infrared emitter are located at the same height, and the angle between the line connecting the infrared receivers and the emitter and the side of the housing is 45°. The top surfaces of the infrared receivers and the infrared emitter are respectively located below the top surface of the spring support mechanism.