The main keyboard in addition to film contact type keyboard, there is another" conductive rubber contact type keyboard", it is only a layer of conductive film,HTPC Keyboard in each key position are not connected with two contact points, and the lower part of rubber spring using conductive rubber to produce, when pressed for time will the two contacts.
Can see, this keyboard theory and calculator key principle is very close. In fact in the early days of personal computers, this design is often in some thin laptop use. Just contact with the thin type keyboard, the service life of the structure is shorter, so now except in some special purpose, have been gradually disappearing.
In the upper right corner of the keyboard, one block and the film together with the circuit board, the circuit board is the keyboard portion of the core, from the conductive film came through the wire guide signal input to the circuit board of the arithmetic chip, the chip will be based on the two surface of the chip through an internal wire number a key arrangement table to find the corresponding keys ASCII code,solar module cell through the interface to output.
The look-up table access key coding mode called" non coding keyboard", there are" coding keyboard", this kind of keyboard ASCII code is directly by each key generated from digital circuits. Compared with non coding keyboard coding keyboard, high cost, heavy difficult to define, so it has very rare. Capacitive keyboard due to its principle of work, mostly coding keyboard, which also proved from another angle is now mainstream keyboard not capacitive keyboard.
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