Title:
【発明の名称】差動式タッチセンサーおよびそれの制御回路
Document Type and Number:
Japanese Patent JP2001507882
Kind Code:
A
Abstract:
A differential touch sensor apparatus for detecting the presence of an object such as a human appendage, the apparatus having a first electrode, a second electrode positioned proximate to the first electrode, a differential circuit connected to the first and second electrodes, and a pulse or other signal source connected to provide electrical signals that generate an electric field between the first and second electrodes. Introduction of an object near the first electrode affects the electric field between the first and second electrodes, thereby affecting the voltage difference between them. A differential circuit provides an output signal responsive to the difference in voltage between the first and second electrodes. In an alternative embodiment, a strobe electrode is provided proximate to both said first and second electrodes and the pulses or other signals are provided to the strobe electrode to induce an electric field between the strobe electrode and each of the first and second electrodes.
Inventors:
Caldwell, David, W
Application Number:
JP52695498A
Publication Date:
June 12, 2001
Filing Date:
December 08, 1997
Export Citation:
Assignee:
Touch Sensor Technologies, LLC
International Classes:
H03K17/955; H03K17/96; G01B7/00; (IPC1-7): H03K17/955
Attorney, Agent or Firm:
Akira Asamura (3 outside)