Computer mice as we know
them started to emerge with PCs made by Apple and Xerox, which had GUI.
Those pointing devices used a ball coupled with two wheels and two
sensors. As the ball rolled, the wheels also did and sensors could detect the
direction and speed of rolling using infrared beams, then a special chip
converted that information into X and Y vectors. The mechanical mice were
inexpensive and easy to manufacture and given that display resolutions were not
high, those products survived the eighties and the nineties.
But mechanical
mice did not behave well in case of high resolutions, they also continuously
collected dirt from the surface and had a number of other drawbacks. As a result,
the optical mouse was born. In fact, although the first prototypes of optical
mice were shown back in the eighties, they were expensive to manufacture and
only worked on certain surfaces. The first commercial optical mice from
companies like Logitech and Microsoft emerged in early 2000s.
Optical mice use LED image sensors
that detect motions based on offset of the surface's texture from the previous
position. The sensors "check" the offsets for over a thousand of
times per second, thus, they can detect even a tiny move. Naturally, the higher
resolution the sensor can scan, the more sensitive mouse is. Usually,
manufacturers of mice use dots per inch (DPI) measure of spatial dot density to
mark mice with higher or lower LED sensitivity. While optical mice were
generally much better than mechanical mice, they did not work well on all types
of surfaces. Laser mice generally fixed the issue and the latest
generation laser mice can even work on glass surface.
Throughout its evolution, mice not
only obtained scrolling wheels, but they also got programmable buttons,
abilities to regulate weighs and many other features that could not be imagined
just fifteen years ago.
But the evolution of the mouse does
not stop on new sensors or lasers. Apple installed a multi-touch surface onto
its Magic mouse and companies like Gyration and Logitech installed gyrascopes
into their models to enable motion sensing. But let's think, do we really need
motion-sensing mice?
View orginal artical here- Motion
Sensing
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