1 - in a capacitive keyboard, pressing the button compresses a spring that causes a plunger plastic and metal
move closer to the two pads fixed on a surface covered by a combination of tin, nickel and copper.
The pads are connected to the printed circuit board of the keyboard.
Although the two metal areas never touch each other, they
act like a capacitor therewith maintaining a positive charge and the other a negative equal.
The lowering spring
some keyboards is designed in such a way that generates a mechanical click.
2 - The plunger of metal passing between the pads reduces the load contained therein.
The difference causes a small load,
but noticeable current flowing through the circuit connected to the pads.
3 - When the key is released, the spring expands, turning the key to its original height by moving the plunger out of
metal pads and causing it to flow - flowing through the circuit pads to which leads - to return to its
original level.
Source: Evolution of Computers
No comments:
Post a Comment