Christopher latham Shoals solved the problem. He invented the layout of QWERTY keyboard. He put the most commonly used letters in the opposite direction, trying to slow down the typing speed and avoid getting stuck.
Christopher Larsen Shoals applied for a patent for this design in 1868, and the first commercial typewriter with this layout was successfully put on the market in 1873.
However, in actual use, it is found that the layout efficiency of QWERTY's keyboard keys is very low. For example, most people are right-handed, but the keyboard with QWERTY results makes the left hand bear 57% of the workload. The little finger and the ring finger of the left hand are both weak fingers, but they should be used frequently.
Letter lines only account for about 30% of the whole typing workload and are placed in the middle column of the keyboard. Therefore, in order to type a word, people often need to move their fingers up and down.
1888 held an open typing competition in the United States. A court stenographer named Ma Jialin typed blindly according to a clear fingering division. The speed is very fast, and the error is only three ten thousandths, which surprised everyone present.
According to the records, Ma Jialin won a prize of 500 dollars at that time. Since then, many people have begun to follow this typing method. Typing technology for the blind has become popular in the field of professional typing, and schools specializing in training typists have begun to appear in the United States.
Extended data:
repair
First, the maintenance of "the computer can't search the keyboard when it is turned on"
There are many factors that can't find the keyboard, such as weak connection, damaged keyboard interface, wrong wiring, damaged motherboard and so on. , but the main problem is almost connection (about 60% probability). For this kind of fault, it is usually to turn off the computer first, then unplug the keyboard interface, and then plug it into the keyboard interface on the motherboard.
Second, the "keyboard key failure" fault maintenance
Keyboard keys fail, generally because there is dirt on the circuit board or conductive plastic, which leads to the failure of normal connection. Other factors are also possible, such as keyboard plug damage, wiring error, motherboard damage, abnormal CPU operation and so on. But they are not the main reason. Therefore, only descaling work is needed.
The operation steps are as follows (note that the scissor-foot keyboard is mainly used for notebooks, especially ultrabooks. Please do not disassemble the keyboard for personal maintenance, otherwise it cannot be replaced):
1. Disconnect the keyboard. Note that when opening the keyboard, the key surface (that is, the side we operate) must be facing down and the circuit board should be facing up, otherwise the conductive plastic on each key will fall off one after another, which will bring trouble to your maintenance.
2. Open the circuit board. Generally, circuit boards are thin films made of soft plastic with button lines engraved on them. Gently scrub with 97% alcohol cotton or 75% medical alcohol cotton. For the circuit of the key failure part, it needs to be wiped several times.
3. Check the conductive plastic of the faulty part of the button. If there is a lot of dirt on it, scrub it with alcohol. Assuming that the conductive plastic is damaged, it is suggested to replace the conductive plastic on the unused keys with damaged parts. Although this measure can't make the keyboard fully functional, it can at least prolong the life of commonly used keys.
4. Clean the dirt in the corner of the keyboard. Tools can be brushes, small brushes, etc. , but move carefully.
5. Check whether the welding module has virtual welding or desoldering. If you can use an electric soldering iron, you can repair the welding. Of course, this step only applies to friends who can use an electric soldering iron. No, please skip this step.
6. After installing the keyboard, one thing to note here is that you must wait until the alcohol completely evaporates.
References:
Baidu encyclopedia-keyboard