At present, it is almost impossible to imagine life without a personal computer. But for its normal operation, the standard configuration of the system unit, as a rule, is not enough. Some input devices are also required.
Currently, there are several options for such elements. In general, an input device is a device with which the necessary data gets into the computer's memory, after which you can continue to work with them. At the moment, manufacturers have significantly expanded their offer in the industry, thereby allowing the consumer to choose the most convenient and necessary type of device.
Information input devices are classified depending on the type of data that falls into the computer's memory. For entering any images, graphic information input devices are used ; for recording voice messages and other sound data, corresponding devices are used. Typically, a keyboard is used to enter textual information. In fact, without it, the correct operation of the computer is simply impossible, so the keyboard can rightfully be considered the queen of the periphery.
The modern keyboard has 101 keys. There are also modifications with the number of buttons equal to 102. All of them are conditionally divided into blocks. There are generally accepted rules for arranging blocks on the keyboard plane. The top row, consisting of 12 buttons, is called a function block. As a rule, when these keys are pressed, certain functions begin to operate, which depend on the installed operating system. Under this row is an alphanumeric block. The number of keys in it varies depending on the alphabet of the country in which the model will be used. This zone is intended for entering directly letters, numbers, various punctuation marks and special characters, as well as performing some arithmetic operations.
The digital block located on the right side of the keyboard essentially duplicates the purpose of the number buttons in the previous block. With its help, it is much more convenient for the user to enter various digital combinations and perform calculations. There is also a block with keys that can change the purpose of certain buttons in other blocks. Since they are used quite often, their sizes are slightly larger than other keys. Modifiers include keys such as Shift, Caps Lock, Ctrl and Alt. Some of them are duplicated on both sides of the space.
Information input devices, which are all kinds of pictures, photos and other images, can also be different. The most common elements in this area are scanners. They also differ from each other, and their principle of operation depends on the design. For example, flatbed scanners transfer information to a PC due to the movement of a special carriage with a light beam along the image placed on a transparent glass, and also thanks to photosensitive elements that receive beam reflections from a system of mirrors and various lenses. Today, such graphic information input devices as tablets are becoming increasingly popular. Due to their design, they allow the consumer to display images on the monitor screen, creating them using a special pen. That is, in fact, you can draw, and the picture will immediately be displayed on the screen.
To record sound on a computer, as a rule, all kinds of microphone models are used. Sometimes they also use special digital voice recorders. In general, due to the fact that progress does not stand still, information input devices acquire a wide variety of modifications.