Digital Padless Touch Keyboard Encoder

摘要

"A pad-less touch sensor for detecting a touch at a sensing location onto a dielectric element by a user coupled to EARTH. Comprising, a test pulse generating means for producing test pulses into EARTH. Whereby when the user touches the dielectric element at the sensing location, a potential variation occurs in the conductive plate during the test pulse due to a capacitive circuit (switch) formed between EARTH, the user and means responsive to potential variation."