Personal computers have become really common relatively recently. Today, a PC or laptop is perceived as a necessary household appliance, and the degree of user awareness of the basics of their work is negligible.
Simply put, many modern "users" are baffled by the simplest questions that once did not cause any excitement. For example, what is the main input device? This term looks scary, it can have several interpretations at once, and therefore needs more detailed analysis and comments. However, for this, this article was created.
Basic concepts
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Despite all the efforts of adherents of touch screens, the keyboard is the main input device. It is simple, does not require special skills in learning, and allows information to be transmitted to a computer in any existing human language. It is possible that with the development of technology something more convenient and universal will be invented, but so far it is far from that. Today, keyboards are a mandatory input device on any computer equipment.If you list the input devices, but forget about the keyboard, an unsatisfactory rating will be provided.
Manipulators (mice, touchpads, trackballs)
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It is safe to say that you can’t work without a Windows system: the user instantly gets bogged down in dozens of windows and a submenu. With Linux, the situation is somewhat different, since almost everything can be done there from the console, but you can’t do anything sensible with graphic editors without a mouse. Not so long ago, the classification was widespread, according to which the "rodents" were divided into models with two and three keys. Today, this type of typing is clearly outdated: classic three-button mice are found only in museums and organizations with very limited funding. Game models can have 20 (!) Buttons, and in place of the third key today almost always has a wheel., . , , . , , (DPI).
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- Optical-mechanical varieties. In principle, the design has the same ball, but its movement is monitored using control LEDs.
- Optical mouse. Cursor movement is controlled only by optical sensors and LEDs. The light that they emit performs the functions of the same ball.
- Wireless mice. The signal to the computer is transmitted not by wire, but through the infrared port or Blue tooth.
Touchpad
The touchpad is descended from a trackball. The latter was a “mouse vice versa,” when the cursor was controlled by a single ball. The touchpad is built on a slightly different principle, when the cursor moves after the movement of the fingers on the touch surface.: , , .
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Scanners are needed to digitize images, photographs, texts and drawings. They are indispensable in archives and libraries, where it is often necessary to carry out a huge amount of work related to digitization. Simply put, such devices perform the input of graphical information.
Scanning equipment can be manual (such a device is very similar to reading scanners in supermarkets), roll and flatbed. Projection models sometimes come across. Again, in the aforementioned archival institutions, it is not so rare to see slide scanners designed to digitize filmstrips. Like mice, this technique is estimated by the number of pixels per inch, only in this case the DPI characteristics are crucial: a scanner with poor performance can even turn high-quality text on absolutely white paper into an unreadable mess., . , : «», . , , .
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In recent years, this technology has developed "to the full." Almost every second first-grader has smartphones with touch control, so it makes no sense to explain all the advantages and disadvantages of this technique. Therefore, we will focus on the description of devices that are actively used today.
Digitizer
So, digitizers are information input devices. This device is designed to enter graphic information, and therefore received special recognition among professional designers and artists. As a rule, these devices are executed in the form factor of well-known tablets. And therefore they are often called graphic tablets., . , - – . . ?
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Another type of manipulator. At first glance, it looks like an ordinary pencil or ballpoint pen connected to a computer with a wire. To adjust the parameters on the pen there are several buttons, the functionality of which allows you to flexibly “fit” the tool to a specific situation. At the tip of the pen there is a photocell, which performs the same function as its “colleagues” in a conventional optical mouse. Currently, such a technique is found only as an element of digitizers. Of course, that the most widespread light feathers were among professional artists and designers.These devices allow you to create an almost reliable simulation of the use of a conventional pencil, which for many specialists is extremely important.
Output
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