The touch switch is an electronic switch, belonging to the category of electronic components. It is also called key switch, which first appeared in Japan. It is called sensitive switch. When used, the switch function is closed and closed by applying pressure to the switch operating direction under the condition of meeting the operating force. When the pressure is removed, the switch is opened immediately. Its internal structure is realized by the change of the force on the metal spring.
The light touch switch is composed of insert, base, spring piece, button and cover plate. The waterproof light touch switch adds a layer of polyimide film on the spring piece.
The light touch switch has the advantages of small contact resistance load, accurate operating force error, and diversified specifications. It has been widely used in electronic equipment and white household appliances, such as: audio and video products, digital products, remote control, communication products, household appliances, security products, game tools, computer products, fitness equipment, medical equipment, money detection pens, laser pen keys, and so on. Because the light touch switch can directly replace large equipment and high-load buttons with conductive rubber or pan switch hardware shrapnel, such as medical equipment, TV remote control, etc., because of the environmental conditions (elastic force applied less than 2 times of pressure/environmental temperature and humidity conditions and electrical performance).
About the pin position of the five-pin touch switch: the two pins are a group. When the switch body is correctly pressed, the four pins are connected, and the fifth pin is used for grounding.
The touch switch is the fourth generation of switch products developed with the requirements of the development of electronic technology. The earliest volume is 12mmx12mm, 8mm and 8mm, and now it is 6mm less than 6om. The product structure includes three types of vertical, horizontal and horizontal ground terminals, and now there are two types of combination (3M, 4M, SM, 6M, SM) and potentiometer touch switch combination, which meet the requirements of various domestic electronic products. There are three types of installation dimensions: 6.smm fire 4.5mm, 5.5mm and 4mm, and 6mm and 4mm. There are 4.5mm and 4.5mm small touch switches and chip touch switches abroad. The chip touch switch is suitable for surface assembly. At present, the use of conductive rubber switches is also very popular [1].
Now there is the fifth generation of switch - membrane switch, which has the same function as the touch switch and is mainly used in electronic instruments and CNC machine tools, but it has high resistance and poor hand feeling. In order to overcome the phenomenon of poor hand feeling, there are also contact reed installed in the membrane switch instead of using the silver layer as the contact point [1].