Data input device with a pressure-sensitive input surface

Details Data input device with a pressure-sensitive input surface Data input device with a pressure-sensitive input surface

1992-11-25

1994-11-29

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

053692284

ABSTRACT:
A data input device having an arrangement of deformable layers including at least a dielectric material above a resistive layer. The material is elastically deformable so that, when pressure is applied to an input surface, the distance between the input surface and the resistive layer is reduced at the pressure point. An electrode which is preferably in the form of a conductive layer is arranged on the side of the deformable layer facing away from the resistive layer. Thus results in a change of the capacitive properties of the deformable layer at the pressure point, since the thickness of the deformable layer is reduced at the pressure point. This capacitive measurement is used for detection of the pressing force, while the position of the pressing point on the input surface is detected in two mutually orthogonal directions on the basis of the voltage divider forming in the resistive layer arrangement.

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patent: 4929934 (1990-05-01), Ueda et al.
patent: 4963702 (1990-10-01), Yaniger
patent: 5028744 (1991-07-01), Purcell

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