Mechanical flat and touch keyboard, has main, secondary and tertiary keys, where complementary and circular shapes of nearby keys and play of reverse spring forces result in sliding of keys and maintain electrical continuity of electrodes

摘要

The keyboard has a main key (P), a secondary key (S) and a tertiary key (T) crossed by grids of electrodes (X, Y) connected to a capacitive control circuit detecting presence of finger on the keyboard. The secondary key includes shape complementary to truncated and reverse truncated pyramid shapes of the tertiary and main keys. Complementary and circular shapes of adjacent keys and a play of reverse forces of springs in compression and extension result in sliding of the keys when the finger exerts slight pressure on position of a keyboard surface and maintain electrical continuity.