What are the main uses of key switches?

Classification：Key switch news

Author: AUGO Electronics

Release date：2022-02-20 21:57:47

Key switches mainly refer to light touch key switches, also known as light touch switches. The key switch is an electronic switch, which belongs to the category of electronic components. It first appeared in Japan [called: sensitive switch]. When used, the switch function is closed and turned on by applying pressure to the switch operating direction to meet the conditions of the operating force. When the pressure is on, the switch is disconnected, and its internal structure is realized by the change of the force of the metal shrapnel.
The key switch is composed of an insert, a base, a shrapnel, a button, and a cover plate. The waterproof tact switch adds a layer of polyimide film on the shrapnel (as shown in the figure below).

The key 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 goods, such as audio and video. Products, digital products, remote controls, communication products, household appliances, security products, toys, computer products, fitness equipment, medical equipment, money detector pens, laser pen buttons, etc. Because of the environmental conditions of the key switch (elastic force with pressure less than 2 times/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. machine remote control, etc.
Regarding the pin position of the five-pin key 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 key switch is the fourth-generation switch product developed with the development of electronic technology. The earliest volume is 12mm*12mm, 8mm*8mm, and now it is 6mm*6mm. 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 key switch combination, which meet the requirements of various domestic electronic products. There are three installation sizes: 6.5mm*4.5mm, 5.5mm*4mm and 6mm*4mm. There are 4.5mm*4.5mm small key switches and chip key switches abroad, and the chip key switches are suitable for surface assembly.
Now there are fifth-generation switches—membrane switches, which have the same function as key switches, and are mainly used in electronic instruments and CNC machine tools, but with large resistance and poor hand feel. In order to overcome the phenomenon of poor hand feel, there are also contact points in the membrane switch instead of using the silver layer, but with contact reeds
Button switches are divided into two categories: the button switches that use metal reeds as switch contact pieces, with small contact resistance, good hand feel, and a "tick" crisp sound. A switch that uses conductive rubber as a contact path is habitually called a conductive rubber switch. The switch feels good, but the contact resistance is large, generally 100-300n. The structure of the key switch is to move down by the key, so that the contact reed or the conductive rubber block contacts the solder tab to form a path.

The main purpose of the key switch
The main uses of key switches are color TVs, black and white TVs, audio equipment, video recorders, video cameras, computers, games Machines, fax machines, walkie-talkies, batons, machine tool controls, copiers, printers, electronic instruments, meters and other household appliances.

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