What is a capacitive sensing touch switch? According to the switching principle, touch switches are classified into resistive touch switches and capacitive touch membrane switches.
Capacitive sensing touch switch Among various technologies, capacitive touch sensing technology has become the mainstream of touch sensing technology. In terms of button scheme, it can improve the overall appearance of the product.
The capacitive sensing touch switch can penetrate more than 20mm of the insulating material shell (glass, plastic, etc.), and accurately detect the effective touch of the finger, ensuring that the sensitivity, stability, and reliability of the product will not change due to environmental conditions Or changes due to long-term use, and has waterproof and strong anti-interference capabilities.
There are many types of multi-touch technology, but the following four are more mature.
1. "LLP (laser light plane) technology", which mainly uses infrared laser equipment to project infrared rays onto the screen. When the screen is blocked, infrared light is reflected, and a camera under the screen captures where the reflection goes. After system analysis, a response can be made.
2. "FTIR (Frustrated Total Internal Reflection) technology" will add LED light to the interlayer of the screen. When the user presses the screen, the light in the interlayer will cause different reflection effects, and the sensor will receive the change of light to capture the user The point of application of force to respond.
3. "ToughtLight technology", using the method of projection, project infrared rays onto the screen. Infrared light is reflected when the screen is blocked, and a camera under the screen captures where the reflection goes. Response can be made after system analysis.
4. "Optical Touch technology", which has a lens at the two ends of the top of the screen to receive the user's gesture changes and the position of the touch point. After calculation, it is converted into coordinates and then reacted.
compared to conventional switches
The capacitive sensor touch switch does not require the human body to directly contact the metal, which can completely eliminate potential safety hazards. It can be used even with gloves, and it is not affected by changes in the resistance of the human body in dry and wet weather. It is more convenient to use. There are no mechanical parts, no wear and tear, unlimited life, and reduced maintenance costs. Its sensing portion can be placed behind any insulating layer (usually glass or plastic material), making it easy to make a keypad that is sealed from the surrounding environment.
The panel pattern can be arbitrary, the size and shape of the button can be designed arbitrarily, and the characters, trademarks, perspective windows, etc. can be matched arbitrarily. It fundamentally solves the effects that various metal panels and various mechanical panels cannot achieve. Its reliability and beautiful design can directly replace the existing common panels (metal keyboard, membrane keyboard, conductive glue keyboard).
lead the industry
The capacitive sensing touch switch can penetrate more than 20mm of the insulating material shell (glass, plastic, touch switch, etc.), and accurately detect the effective touch of the finger. It also ensures that the sensitivity, stability, and reliability of the product will not change due to changes in environmental conditions or long-term use, and it has waterproof and strong anti-interference capabilities.
simple application
Single chip, very few peripheral parts, very simple circuit, no need for oscillation circuit, simple production process, and satisfactory results can be obtained only by laying out the board according to the schematic diagram. There are touch button sensing series ICs with various special interface requirements, a single button, and various special requirements interfaces, and there is no need to modify the main control program of the product MCU at all. It is very easy to interface with the microcontroller to realize various touch control applications.
free adjustment
Touch sensing execution time (sensitivity) can be adjusted freely according to requirements;
technology leadership
It has a unique algorithm to avoid key linkage; single 3-5V power supply, wide voltage range and low power consumption. The built-in stabilized power supply can be used directly; the touch key sensor series IC has automatic calibration and compensation functions, no complicated production adjustment is required at all, and a capacitor determines the sensitivity, which is not affected by the ambient temperature and is suitable for mass production; adopts the principle of capacitive sensing , (non-electrode contact touch method), the design is more casual and fashionable; with the glass panel, it is not afraid of liquid splashing, and can still maintain normal control functions; strong penetrating ability, can penetrate more than 20mm of any insulating material panel, such as : tempered glass, ceramics, plastics... and other materials;
Wide range of applications
Audio panels, telephone control keyboards, instrumentation control panels, washing machine control panels, intelligent access control system control panels, various small appliances (induction cooker, disinfection cabinet, microwave oven...), have covered household appliances, handheld devices, industrial control, automobiles Electronics, military products, etc., are used in almost all application fields involving control button operation panels.
cost-effective
The pursuit of win-win, the most competitive and cost-effective products, the industry pioneer of popularization and standardization of touch applications.
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