Key switch mainly refers to the light touch key switch, also known as light touch switch. Pushbutton switch is a kind of electronic switch, belongs to the electronic components category, first appeared in Japan [called: sensitive switch], when used to meet the conditions of the operating force to the switch operating direction of the pressure switch function closure connected, when the withdrawal of the pressure switch that is disconnected, and its internal structure is to rely on the change of the force of the metal shrapnel to realize the on and off.
The key switch consists of an insert, a base, a shrapnel, a pushbutton, and a cover, and the waterproof light-touch switch has a layer of polyimide film added to the shrapnel, as shown in the figure
Basic introduction Chinese name ：Key switch Foreign name ：Touch switch The key switch has the advantages of a small contact resistance, precise operating force error, and diversification of specifications, which have been widely used in the fields of electronic equipment and white goods, such as: electronic equipment and home appliances. They are widely used in electronic equipment and white goods, such as audio-visual products, digital products, remote controls, communication products, household appliances, security products, toys, computer products, fitness equipment, medical equipment, money detector pens, laser pointer keys and so on. Because the key switch on the environmental conditions (pressure less than 2 times the elasticity / ambient temperature and humidity conditions and electrical properties) of large equipment and high load buttons are used to conductive rubber or pot switch hardware shrapnel directly instead of, for example, medical equipment, TV remote control, and so on. On the five-legged pushbutton switch feet: two pins for a group, to the switch body correctly apply pressure when the four pins phase conduction, the fifth pin for the role of ground. Key switch is the fourth generation of switch products developed with the requirements of the development of electronic technology, the earliest volume of 12mm * 12mm, 8mm * 8mm two kinds of, and now 6mm * 6mm. the product structure of the vertical, horizontal and horizontal with the ground end of the three kinds of, and now there is a combination of (3M, 4M, SM, 6M, SM) and the potentiometer key switch combination of two types, to meet a variety of domestic electronic products Requirements. Installation size of 6.5mm * 4.5mm, 5.5mm * 4mm and 6mm * 4mm three. Overseas, there are 4.5mm*4.5mm small key switches and chip key switches, and the chip key switches are suitable for surface assembly. Now there is a fifth generation of switches - membrane switches, the same function and key switches, mainly used for electronic instruments and CNC tool machines, but the resistance is large, poor feel. In order to overcome the phenomenon of poor feel, there are also in the membrane switch is not a silver layer to do the contact point, but loaded with contact reeds Key switch is divided into two main categories: the use of metal reeds as a switch contact plate, said key switch, contact resistance is small, feel good, there is a "ticking" crisp sound. The use of conductive rubber as a contact path switch is customarily referred to as conductive rubber switch. Switch feel good, but the contact resistance is large, generally in 100 a 300 n. The structure of the key switch is to move down by the key, so that the contact reed or conductive rubber block contact pads, the formation of the path. The operating force of a keyswitch is related to the state of the reed. The starting force is directly proportional to the compression distance of the reed, and when the reed is compressed to 5% to 70%, the operating force is suddenly reduced and accompanied by a "ticking" sound. Turtle guide rubber switches are generally available in two configurations. The operating force curve varies greatly with the geometry of the rubber block. Relative Humidity:<95% Rated Voltage:12V Rated Current:50mA Temperature:-25~70℃ The main uses of key switches are color TV sets, black and white TV sets, audio equipment, video recorders, video cameras, computers, game consoles, facsimile machines, walkie-talkies, truncheons, tool machine controls, photocopying, printers, electronic instruments, instruments, and other household appliances.