1. The mechanical keyboard adopts a similar metal contact switch. The working principle is to make the contacts turn on or off. It has the characteristics of simple technology, high noise, easy maintenance, strong rhythm when typing, and the feeling will not change after long-term use.
2. Plastic membrane keyboard The keyboard is divided into four layers in total, realizing no mechanical abrasion. Its characteristics are low price, low noise and low cost, but after long-term use, the hand feel will change due to material problems. Has occupied most of the market share.
3. The structure of conductive rubber keyboard contacts is connected by conductive rubber. There is a layer of electrically conductive rubber bumps inside the keyboard, and each button corresponds to a bump. When pressed, the contacts below are connected. This type of keyboard is a transitional product from a mechanical keyboard to a membrane keyboard in the market.
4. The contactless electrostatic capacitance keyboard uses a principle similar to that of a capacitive switch. Changing the distance between the electrodes when pressing the key causes the capacitance to change to drive the encoder. It is characterized by no wear and good sealing.
The number of keys on the keyboard has appeared 83 keys, 87 keys, 93 keys, 96 keys, 101 keys, 102 keys, 104 keys, 107 keys and so on. The 104-key keyboard is based on the 101-key keyboard and provides three shortcut keys for the WINDOWS 9.Xp platform (two of them are repeated), so it is also called the WINDOWS 9X keyboard. However, not many users are accustomed to using WINDOWS keys in practical applications. The 107-key keyboard is a keyboard with three keys added separately to fit Japanese input. In some systems that require a large number of single numbers to be input, there is also a small number entry keyboard, which basically separates the small keyboard of the standard keyboard to achieve the purpose of reducing the size and reducing the cost.
