The Classification of the keyboard
Keyboard is the most common input device of the computer, and it is widely used in microcomputers and various terminal devices. The keyboard is a set of keys arranged by the system to operate a machine or device, and its main function is to input characters and text by pressing the buttons. And an operator can input various commands or data to the computer through the keyboard to ensure that the computer works well. The operation condition of the computer can display in the monitor, so that the operator can easily dialogue with the computer through the keyboard and monitor to modify and edit the program and to observe and control the operation and the computer. The keyboard, one of the important computer gadgets, can be divided into desktop keyboard, laptop keyboard, industrial computer keyboard, shorthand machine keyboard, dual control keyboard and ultra flat keyboard in accordance with the application. According to the number of hitting keys in the process of inputting text, the keyboard can be divided into one-touch input keyboard, double input keyboard and multi-key input keyboard. What is now commonly used is one-touch input keyboard, and multi-key input keyboard is installed upon the shorthand machine. And the latest keyboard with four-button input belongs to the double input one. According to the operation principles, the keyboard can be divided into four classifications: mechanical keyboard, membrane keyboard, conductive rubber keyboard and capacitive keyboard. The mechanical keyboard is with contact switches, and it works through turning on or off the contact. With the advantages of easy operation and maintenance, it is very popular among computer users. The inside of the membrance keyboard can be divided into four parts, and it successfully achieves the goal of eliminating mechanical wear. Because of its low price, low noise and low cost, it has occupied most of the market share. The contact structure of the conductive rubber keyboard is connected by conductive rubber, and that is how it gets the name. And there is a layer of raised conductive rubber inside the keyboard, and pressing a button can successfully input a character because each key corresponds to a raised point. This type of keyboard is an alternative product in the transition from the mechanical keyboard to membrance keyboard. The capacitive keyboard can achieve the purpose of inputting by driving the encoder through changing the distance between the electrodes in accordance with the working principle of capacitive switches. And it has a good sealing quality.