Also known as a key switch, it first appeared in Japan [called: sensitive switch]. When it is used, the switch function is closed and turned on by applying pressure to the operating direction of the switch to meet the conditions of the operating force. When the pressure is removed, the switch is disconnected, and its internal structure The on-off is achieved by the change of the force of the metal shrapnel. The tact switch is composed of: insert, base, shrapnel, button and cover plate. The waterproof tact switch adds a layer of polyimide film on the shrapnel.

Tact switches have the advantages of small contact resistance load, accurate operating force error, and diversified specifications. They are widely used in electronic equipment and white goods, such as audio and video products, digital products, remote controls, communication products, household appliances, etc. Electrical appliances, security products, toys, computer products, fitness equipment, medical equipment, money detector pens, laser pen buttons, etc. Because of the environmental conditions of the tact switch (elastic force with less than 2 times the pressure/environmental temperature and humidity conditions and electrical performance), large equipment and high-load buttons are directly replaced by conductive rubber or dome switch hardware shrapnel, such as medical equipment, TV remote control, etc.

Regarding the pin position of the five-pin tact switch: two pins are a group. When the switch body is properly pressurized, the four pins are conducting, and the fifth pin is grounding.

The tact switch is the fourth-generation switch product developed with the development of electronic technology. The earliest volume is 12mmx12mm, 8mm and 8mm, and now it is 6mm and 6om. There are three types of product structures: vertical type, horizontal type and horizontal type with ground end. Now there are two types of combination type (3M, 4M, SM, 6M, SM) and potentiometer tact switch combination, which can meet the requirements of various domestic electronic products. . There are three installation sizes: 6.smm, 4.5mm, 5.5mm and 4mm, and 6mm and 4mm. There are 4.5mm and 4.5mm small tact switches and chip tact switches abroad, and the chip tact switches are suitable for surface assembly. At present, the use of conductive rubber switches is also very popular.

Now there is the fifth generation switch-membrane switch, the function is the same as that of the tact switch, it is mainly used in electronic instruments and CNC machine tools, but the resistance is large and the hand feel is poor. In order to overcome the phenomenon of poor hand feel, there are also contact reeds installed in the membrane switch instead of using the silver layer as the contact point.