Stylus input capacitive touchpad sensor

Details Stylus input capacitive touchpad sensor Stylus input capacitive touchpad sensor

1995-10-19

1999-08-24

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1806, 178 1903, G08C 2100

Patent

active

059427337

ABSTRACT:
A capacitive touch pad comprises a substrate material, such as a PC board type laminate material, having a plurality of first parallel conductive traces running in a first (X) direction disposed on a first face thereof, and a plurality of second parallel conductive traces running in a second (Y) direction, usually orthogonal to the first direction, disposed on an opposed second face thereof. A layer of pressure-conductive material is disposed over one of the faces of the substrate. A protective layer with a conductive coating on its back surface is disposed over the top surface of the pressure-conductive material to protect it. In an alternate embodiment, a capacitive touch sensor comprises a rigid substrate material having a conducting material disposed on one face thereof. A layer of pressure-conductive material is disposed over the conductive material on the substrate. A flexible material, having a plurality of first parallel conductive traces running in a first (X) direction disposed on a first face thereof, and a plurality of second parallel conductive traces running in a second (Y) direction disposed on an opposed second face thereof is disposed over the layer of pressure-conductive material. A protective layer is disposed over the top surface of the pressure conductive material to protect it. In yet another embodiment, an air gap is used in place of the layer of pressure-conductive material and the upper layers are supported by a frame at the periphery of the touchpad.

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