Computer mouse
The computer mouse is an input or control unit for the operation
of the software. The computer mouse is used to control the graphical user
interface of a computer.
The computer mouse is used to control the virtual pointer
(cursor) displayed on the computer screen. The buttons are used to perform
actions that depend on the position of the pointer on the screen. And with the
scroll wheel, you can move the contents of the windows vertically.
Mobile computers, such as laptops, are also come with mouse control.
A touch surface is attached to the screen,
which can be used to move the mouse pointer. Different for tablets. Here, the entire surface of the screen
is sensitive. The graphical interface is operated with a finger on the touch
screen.
Mouse interfaces
The mouse is connected to the computer via a connection cable. The
connection type is serial (COM), PS / 2 or USB. Sometimes it is also wireless
and transmits its signals by radio. A receiver is connected to the PS / 2 or
USB. There are also Bluetooth radio kits.
PS / 2 - Mini-DIN
USB - Universal Serial Bus
Bluetooth
Types
Wireless mouse
Optical mouse
Trackball Mouse with trackball
Gstick
mouse
Mechanical
mouse or ball mouse
Mouse
The central element of a mechanical mouse is a ball that protrudes
on the underside. When the mouse is moved on a flat surface, the ball rotates.
Inside the mouse are arranged two rollers at an angle of 90 degrees. These
rollers touch the ball and turn with each movement. A roll responds to left or
right lateral movements. The other roller responds to high or low movements. At
the end of each roll, there are wheels with metal rays. Above the spokes, two
metal contacts are mounted, which generates electrical signals at each
movement. The direction of movement, speed,
and distance are determined from the signals.
In another type of mechanical mouse, the ball carries small
shafts, to which perforated discs are attached. The direction of rotation of
the perforated discs is interrogated by light barriers. Again, electrical
signals are generated and direction, velocity,
and distance are determined.
In the computer, the information for the pointer movement (cursor)
is converted on the screen. By pressing the mute buttons, the signals are also
sent to the computer. Depending on the position of the pointer and the number
of key operations (mouse clicks), an action is performed.
The mechanical mouse has a considerable disadvantage. The ball
carries the dirt inside, creating movement problems. These must be cleaned
regularly, otherwise, the cursor moves
when the mouse is pressed. However, they are no longer in use
Trackball
The trackball mouse is a
replacement of the formal, in principle, a mechanical reverse mouse. Instead,
the ball comes out of the case at the top of the trackball. The ball is
significantly larger and can be moved with the thumb or with the fingers. The
case stays on the table. It is not moved. This is a great advantage because
small space is needed
Optical mouse with standard LED
The first variant of an optical mouse was an absolute innovation.
The ball and the running of the mechanical mouse have always caused a problem.
Compared to the mechanical mouse, the optical mouse is
maintenance-free. A red light emitting diode and a phototransistor (sensor) are
located in the optical mouse where the ball is located in the mechanical mouse.
With these two components, the mouse scans a grid for the support.
The mouse detects the direction of movement and the speed of movement. This
information is sent to the computer.
On very smooth, shiny or reflective surfaces, however, the sensor
does not measure differences in movement. Motion detection does not work
properly. The mouse pointer clogs and shakes itself uncontrollably on the
screen. Highly reflective surfaces such
as marble and glass have always been a problem for optical scanning
electronics. Therefore all further developments aimed at increasing the
precision and optimizing the optics so that more surfaces are possible without
problems. With a laser diode, the
precision is significantly improved. In this case, an angled sensor directly
receives the light reflecting from the surface. However, transparent glass and
mirrors are still a problem for this technology. Optical Mouse with BlueTrack
from Microsoft In order to improve the accuracy even further, Microsoft
developed a technique called BlueTrack. As the name suggests, the higher
precision comes from a wide-spreading blue LED. In addition, BlueTrack works
with improved optics and reworked image processing. With BlueTrack the mice
also work on marble, grained wood, and
even carpets.
USESS
Previously, the mouse was an input device. Today it is said that
the mouse would be a pointer. It does not matter. In any case, the
operation of the computer without a mouse is almost unimaginable. The mouse
performs many functions. Some examples:
Use the mouse to draw lines and objects.
Use the mouse to move files
from one location to another.
In computer games, the mouse acts as a control tool.
The programs are started and closed with the mouse
The programs work with the "mouse clicks".
Thus the mouse has a central importance for the operation of the
computer. If you are a beginner, you must take the time to master the operation
of the mouse.
The picture shows a mouse. A mouse usually has 2-3 keys. The left
mouse button and the right mouse button. Most recent mice come with a scroll wheel. You can also click a scroll
wheel. There are of course also mice with more than 3 keys. These are used
mainly by players, for example, to carry
out specific actions in the game quickly.
The pad of the mouse is also important. Because a mouse is pushed
back and forth on a pad and the computer resumes the work. There are mice that
still need a special pad (mouse pad) to absorb the movements of the mouse.
Other mice such as optical mice do not need special support. They can be moved
normally to the desktop.
