There are two types of conventional keyboards: mechanical keys and capacitive keys. In the industrial computer keyboard, there is also a keyboard with a light touch membrane key. The mechanical keyboard is a structure that has been selected for a long time. Generally, it is similar to the principle of a touch switch to make the contacts turn on or off. It has the characteristics of simple process, convenient maintenance, general hand feeling, high noise and easy wear and tear.
Most cheap mechanical keyboards use copper sheet springs as elastic materials, copper sheets are easy to fold and lose elasticity, and the failure rate increases over a long period of use, capacitive keyboards. It is a keyboard based on capacitive switches. The principle is to change the capacitance by changing the interval between the keys, which temporarily constitutes the conditions for the vibration pulse to pass through.
In theory, this kind of switch is non-contact and non-touch, the wear rate is small or even negligible, and there is no hidden danger of bad touch. It has low noise, simple control feel, and can produce high-quality keyboards, but the technology is more than mechanical structure. clutter. There is also a keyboard used for industrial computers to use light-touch membrane keys in order to be completely sealed, which is only suitable for special occasions.
According to the shape of the keyboard, it is divided into standard keyboard and ergonomic keyboard. The interface of the keyboard includes AT interface, PS/2 interface and new USB interface. Desktop computers mostly use PS/2 interface, and most motherboards provide PS/2 keyboard interface. Older motherboards often provide AT ports, also known as “big mouths”, which are not common anymore.