What is the classification of keyboards? I believe everyone is familiar with the keyboard. Most people use keyboards when using computers. There are many kinds of keyboards, and different people choose different keyboards. How can I share the classification of keyboards?
What is the classification of keyboards? 1 common type.
The general desktop keyboard can be classified according to the number of keystrokes, the working principle of keys, the shape of the keyboard and so on.
There are many kinds of keyboards, which can be generally divided into contact, non-contact and laser (laser laser keyboard). The former uses metal to connect or disconnect two contacts to input signals, while the latter uses Hall effect switch (using magnetic field change) and capacitive switch (using current and voltage change) to generate input signals.
Divided by code
From the coding function, the keyboard can be divided into full coding keyboard and non-coding keyboard.
The fully coded keyboard is realized by hardware. By identifying whether the key is pressed and the position of the pressed key, the full coding circuit generates unique corresponding coding information (such as ASCII code). Non-coding keyboard is realized by software, which uses simple hardware and a special keyboard coding program to identify the position of keys, and then CPU converts the position code into corresponding coding information through table lookup program. Non-coding keyboard has a low speed, but its structure is simple. Redefining some keys through software can provide great convenience.
By application
According to the purpose, it can be divided into seven categories: desktop keyboard, notebook computer keyboard, industrial computer keyboard, quick recording keyboard, dual-control keyboard, ultra-thin keyboard and mobile phone keyboard.
According to the nature of symbols
According to the nature of symbols, they can be divided into two categories: alphabetic keyboard and numeric keyboard.
Dual USB control keyboards, one keyboard can control two computers, and one key can switch for 2 seconds, which is fast and convenient.
According to the working principle
1, the mechanical keyboard (machinery) adopts a switch similar to a metal contact. Its working principle is to make the contact on or off. It has the characteristics of simple technology, loud noise, easy maintenance, strong sense of rhythm when typing, and the touch will not change after long-term use.
2. The plastic film keyboard is divided into four layers to realize no mechanical wear. It is characterized by low price, low noise and low cost, but the handle will change due to material problems after long-term use, which has occupied most of the market.
3. The contact structure of the conductive rubber keyboard is connected by conductive rubber. There is a layer of raised charged conductive rubber inside the keyboard, and each key corresponds to a bump. When pressed, the lower contact is turned on. This kind of keyboard is a transitional product from mechanical keyboard to membrane keyboard in the market.
4. Non-contact capacitive keyboard uses the principle similar to capacitive switch to change the distance between electrodes when pressing keys to change the capacitance, thus driving the encoder. Its characteristics are no wear and good sealing performance.
There are 83 keys, 87 keys, 93 keys, 96 keys, 10 1 key, 102 key, 104 key, 107 key and so on. The 104 keyboard is based on the 10 1 keyboard, and three shortcut keys (two of which are duplicated) are added to the WINDOWS 9X platform, so it is also called the WINDOWS 9X keyboard. However, there are not many users who are used to using WINDOWS keys in practical applications. The keyboard with 107 key is a keyboard with three keys added separately for Japanese input. In some systems that need to input a large number of single numbers, there are also small number input keyboards, which basically separate the small keyboard of the standard keyboard to achieve the purpose of reducing the size and reducing the cost.
Enter the number of points by text.
According to the number of simultaneous keystrokes of text input, it can be divided into single-key input keyboard, double-key input keyboard and multi-key input keyboard. The commonly used keyboard belongs to single-key input keyboard, the speed recording keyboard belongs to multi-key input keyboard, and the latest four-segment input method keyboard belongs to double-key input keyboard.
Reference key
Put the finger of the left hand on a s d f and the finger of the right hand on J K L；; Chinese keyboard benchmark key index finger: 74 1 middle finger: /852 ring finger: *963. Little finger:-+Enter, thumb is 0.
What is the classification of keyboards? 2. The origin of keyboard arrangement.
The alphabetical order of the keyboard is sorted according to the frequency of using letters. Interested readers may wonder: Why do you want to arrange 26 letters in this random way? It is difficult to remember and master. It is said that the reason is this:
19 In the 1970s, Shoals Company was the largest professional typewriter manufacturer at that time. Because the mechanical technology was not perfect at that time, the keys rebounded slowly after being struck. Once the typist hits the keys too fast, the two keys are easily twisted together and have to be carefully separated by hand, which seriously affects the typing speed. To this end, the company often receives complaints from customers.
Designers and engineers have racked their brains to solve this problem. Later, a clever engineer suggested that the reason why the typewriter twisted the keys was that the keys rebounded slowly on the one hand, and the typist was too fast on the other. Since you can't improve the rebound speed, why not try to slow down the typing speed?
This is undoubtedly a new idea. There are many ways to slow down the typist. The easiest way is to disrupt the arrangement of 26 letters and put commonly used letters under clumsy fingers. For example, the letters "O", "S" and "A" are frequently used, but they are hit by the clumsiest right hand ring finger, left hand ring finger and left hand little finger. Unusual letters such as "V", "J" and "U" are handled with the most flexible index finger.
Thus, this "QWERTY" combination keyboard was born and gradually took shape. Later, due to the development of materials and technology, the speed of keys bouncing back is much faster than that of typists, but the alphabetical order of keyboards cannot be changed. Up to now, there have been many reasonable letter design schemes, but none of them can be popularized, which shows how powerful the customary forces of society are.
In addition, keyboard also refers to keyboard instruments, such as electronic organ and piano. When the band performs live, many sound effects (such as string sounds in rock music) need to be simulated by electronic piano or electronic piano. The musician in charge of this kind of instrument is called a "keyboard player".
Today, the most commonly used input devices for personal computers are keyboards and mice.
The universal keyboard with 10 1 key or 102 key is named QWERTY keyboard because of the arrangement of English letters. There is no doubt that it was born on the English typewriter. Bill Gates once used this keyboard to illustrate the standard of "fact": "The alphabetical order on English typewriters and computer keyboards is QWERTY, and there is no law that it must be arranged in this way. But they are effective and most users will adhere to this standard. " Interestingly, this arrangement is not a reasonable layout.
The inventor of QWERTY keyboard is C. Shoals, who lived in the American Civil War in the19th century and was the editor of Milwaukee News. With the help of his good friend Saul, Shoals developed the page numbering machine and obtained the invention patent. Glidden, a colleague of the newspaper, suggested that he further develop a typewriter on this basis and bring him the experimental data of the British.