INVENTION OF TOUCHPAD
The introduction of
laptop created a problem, how to use laptop cursor without a mouse? The
solution created by American inventor Dr.George
Construction and working:
His touchpad works on
employing several layers of material. At the top is a protective layer, about 3
inches (8cm) square, that the user touches. Underneath are several layers of
electrodes arranged in horizontal and vertical rows, each separated by thin
layer of insulation. These electrodes are connected to a circuit board that
provides them a constant supply of alternating current.
When finger touches the pad,
it interrupts the current, this locality of current registered in circuit board.
Any further movements of the finger and new interruptions are then compared to
the initial touch point and so the fingers moment get recorded and reproduced
on screen.
Appliances:
The same application used
in cell phones (touch mobiles).It was moved from personal computers(laptop) to
cell phones(touch phones).
Source of this article:
1001 INVENTIONS THAT
CHANGED THE WORLD-Preface by Trevor Baylis and General Editor Jack Challoner.
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