Pointing Devices - Computer Mouse

Pointing Devices - Computer Mouse


Without them, communication with the computer, would even be impossible for an ordinary user. You tried to imagine the torment of performing the simplest activities, not to mention more advanced operations. Fortunately, some wise head came up with the idea of ​​creating a small tool commonly known as a "mouse". It was she who contributed to the creation of the rest of the then pointing devices, which are trackballs, graphic tablets, light pens and others.

Computer mouse, Everything is clear because you use it whenever you want to use a computer. Well, if you really know everything, go ahead and scroll down, maybe you will be interested in the issue of the trackball or some other device, However, if you are thirsty for knowledge, I invite you to read on.

There are two basic types of mice:

  • mechanical ("Ball")
  • optical

The principle of operation and the construction of a mechanical mouse are very simple. Inside there is a rubber ball, the rotation of which sets in motion two rollers placed in the vertical and horizontal axis. At the end of each of them there are small circles with holes cut out, rotating, they let through and block the light beam which falls on a special infrared sensor. The flashing light is transformed into electrical impulses, which eventually interprets as mouse movement. Everything is very simple and very logical. Of course, each mouse has two buttons and a scroll wheel, where previously there was a third button in the place of the roller. Unfortunately, mechanical mice had one very unbearable drawback, this rubber ball was collecting an awful lot of dirt which caused it to get stuck. It is easy to guess what this resulted in.

The disadvantages of the predecessor were eliminated in the optical mouse by removing the mechanical parts. In their place were optical elements. The principle of operation in this case is a bit more complicated. LED or laser diode generuje strumień światła, podczas ruchu jest on odbijany od podłoża i skupiany za pomocą niewielkiej lenses already CCD or CMOS matrix znanej choćby z aparatów fotograficznych. After the light is converted into electrical impulses, they are transferred to the motherboard where they are interpreted as motion.


I have already said everything I need to know about the mice, so I will now move on to the device which is not very popular trackball. Well, a trackball (because that's his Polish name) it is very impractical for domestic use, nie wspominam nawet o próbie grania na tym w gry komputerowe gdyż wszelkie próby kończą się na ponownym podłączeniu swojego „gryzonia”. So why was this contraption even created if it is so horrible?. Well, the trackball is perfect for specialized applications such as: design work, control of industrial devices or medical devices, where great precision is required. It is worth mentioning that it was also used in laptops, where trackpads were later replaced.