There are two types of conventional keyboards: mechanical keys and capacitive keys. There is also a keyboard with a light touch membrane key in the keyboard of an industrial computer. The mechanical keyboard is the earliest structure adopted. Generally, it is similar to the principle of a metal contact 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 of the cheap mechanical The keyboard uses copper sheet springs as elastic materials. The copper sheets are easy to fold and lose elasticity, and the failure rate increases over a long period of time. Now they have been basically eliminated and replaced by capacitive keyboards. It is a keyboard based on capacitive switches. The principle is to change the distance between the electrodes by pressing the keys to change the capacitance, and temporarily form the conditions for the oscillating pulse to pass through. In theory, this switch is non-contact and non-contact, the wear rate is extremely small or even negligible, and there is no hidden danger of poor contact. It has low noise, easy to control feel, and can produce high-quality keyboards, but the process is more mechanical. complex structure. There is also a keyboard for industrial computers that uses light-touch membrane keys in order to be completely sealed, which is only suitable for special occasions.
