How the four-pin key switch works
The working principle of four-pin key switch is actually similar to that of ordinary push-button switches. The contact and the normally closed contact are combined. In the four-pin key switch, the function of the normally open contact is that when the pressure is applied to the normally open contact, the circuit is turned on; when the pressure is removed When , it returns to the original normally closed contact, which is the so-called disconnection. This pressing force is the action of using our hands to turn the button on and off. All in all, the working principle of the four-foot key switch is still well understood.
Four foot key switch application range
The application scope of the four-foot key switch is in household appliances such as electric fans, microwave ovens, TV sets, electronic fat scales, rice cookers and electronic kitchen scales; monitors, video interphones, etc. in security products; voice recorders in computers , cameras, etc.; call systems in medical equipment, sphygmomanometers, thermometers, etc., massage chairs in fitness equipment, running machines, etc., in these fields, four-foot key switches are involved in applications. In addition, there are many aspects, and it can be seen from the application range of the four-foot key switch that this switch will be more widely used in the future development.
Precautions for using four-pin key switch
Regarding the welding of the four-pin key switch, it is necessary to confirm the production conditions. Due to different conditions, the conformity applied to the terminal, deformation and deterioration may also occur, so be sure to pay attention to this point when using it. For the influence of thermal stress on the four-pin key switch, it is necessary to make sufficient preparations for confirmation before use; for the two welding processes, after the first welding, please return to the normal temperature state for the second welding, if continuous heating , it will change the shape of the four-pin key switch, and the terminals may also fall off, resulting in reduced electrical characteristics. The resistive load of the four-pin key switch is designed on the premise. When using other loads, please pay attention to confirmation.
The application scope of the four-legged key switch was briefly mentioned earlier, in household appliances such as electric fans, microwave ovens, televisions, electronic fat scales, rice cookers and electronic kitchen scales; monitors, video interphones, etc. in security products ; Recording pens, cameras, etc. in computers; calling systems, sphygmomanometers, thermometers, etc. in medical equipment; In addition, there are many aspects, and it can be seen from the application range of the four-foot key switch that this switch will be more widely used in the future development.
Four-foot key switch selection method
The quality of the key switch will directly affect the use of the product. Therefore, when choosing a four-pin button switch, pay attention to its physical properties such as solderability, protection, and conduction. The service life is long and the touch is rough. These external surface factors will also determine the four-pin button. Switch pros and cons. In order to reduce the resistance, the pins will be silver-plated, so the high-quality four-pin key switch should control the thickness and process of silver plating on the pins. The final silver plating is more than 0.3um, and the thin silver is 0.2 um, 0.1um is white plated. After the four-legged key switch is silver-plated, whether its protection has the function of waterproof and dustproof, otherwise, no matter how good the silver-plated treatment is, it will also be oxidized by the air!
