Tact switch key structure analysis
The tact switch means that the state of the switch contacts can be changed without much contact force, so the contact capacity is very small and the structure is simple. After the switch force is withdrawn, it can only maintain the original state. State, that is to say, it is quite a single-contact key switch without locking that can be pressed with a small force. At present, the structure of the tact switch mostly adopts the conductive circuit printed on two mutually insulating films. The circuit is connected to each other, or the butterfly shrapnel made of thin elastic metal is used, and the shrapnel can be pressed to cause the circuit to be connected or disconnected.
Tact switch waterproof rating Description
Generally speaking, IP67 refers to the abbreviation of the switch industry protection security level, which defines an interface for solid objects and Protection against liquid objects. The 2-digit numbers after IP represent protection from large foreign objects to dust and protection from vertical water droplets to underwater pressure. The larger the two-digit number after IP, the stronger the capability. Moreover, the tact switch is also divided into many types of specifications, and each type of switch with different specifications has different waterproof levels, so the application scenarios are also different.
The working principle of the tact switch is that when you press it down, the switch with two feet is a short circuit between the two feet. Generally speaking, pressing the contact of the flip switch will press to make the lines connect to each other and sense, so press The function of making or breaking the connection of the circuit can be caused by moving the shrapnel. If you press the switch twice to open and press the switch twice, it is impossible to achieve it by touching the switch. The signal of the touch switch must be connected to other circuits. For example, check whether your switch is pressed twice. Once detected If you press it twice, you can perform the function of opening and closing the circuit, so the function of the switch is to turn on and off twice, even if you don't need to short-circuit or disconnect the switch wire twice, the function can be achieved.
Tact Switch Considerations
1. When welding the terminals of the tact switch, do not apply too much force to the terminals, so as to avoid the possibility of loosening, deformation and reduction of electrical characteristics. In addition, during welding, be careful not to connect the wiring of the switch incorrectly, so as not to connect wrongly, which will cause failures such as unusability or short circuit.
2. After multiple welding of the tact switch, it should be noted that each welding part must wait for the return to normal temperature before operation. If it is heated continuously, the terminals of the switch may be deformed or welded. .
3. Regarding the use of the tact switch for too long, there will definitely be a lot of dust and debris inside. Generally, it cannot be washed with water for cleaning, so as not to easily cause the components of the switch to be damp and fail, so it should be able to use cotton cloth. Wipe with alcohol.
4. Secondly, for the installation of the tact switch with pins, please weld at the pin position. If the welding is performed in the state where the midpoint of the pins of the switch is fixed, the parts of the pins may be deformed.
5. Do not install and use the tact switch in an environment where the surrounding materials emit corrosive gas, otherwise it may cause corrosion of the switch components, thus making the switch unusable. When the switch is installed, it is necessary to ensure that its pins are firm. If it is loose, the current transmission of the pins of the switch will be unstable, which will also lead to the possibility of burning.
