公开(公告)号：CA2257920C

公开(公告)日：2006-10-17

申请号：CA2257920

申请日：1997-12-08

Applicant: TOUCH SENSOR TECHNOLOGIES LLC

Inventor： CALDWELL DAVID W

IPC: G01B7/00 ,  H03K17/955 ,  G01R31/327 ,  H03K17/96

Abstract: A differential touch sensor apparatus for detecting the presence of an object such as a human appendage, the apparatus having a first electrode (16), a second electrode (18) positioned proximate to the first electrode, a differential circuit (Q1, Q2, 34, 48) connected to the first and second electrodes, and a pulse or other signal source (60) 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 (22) 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.

公开(公告)号：CA2203695C

公开(公告)日：2002-08-06

申请号：CA2203695

申请日：1995-10-25

Applicant: TOUCH SENSOR TECHNOLOGIES LLC

Inventor： CALDWELL DAVID W

IPC: H03K17/955 ,  H03K17/96

Abstract: A low impedance touch sensor detects manual contact of a dielectric substrate (10) by a human user. The touch sensor includes a first conductive electrode pad (16) having a closed, continuous geometric form and a second conductive electrode (18) which substantially surrounds the first electrode in a spaced apart, coplanar relationship by a channel (20). The first and secon d electrodes are disposed on the same planar undersurface (14) of the substrat e. An active electrical component (26), such as a transistor, is located on t he substrate proximate the first and second electrodes, and is electrically coupled to the first and second electrodes.

公开(公告)号：CA2257920A1

公开(公告)日：1998-06-18

申请号：CA2257920

申请日：1997-12-08

Applicant: TOUCH SENSOR TECHNOLOGIES LLC

Inventor： CALDWELL DAVID W

IPC: G01B7/00 ,  H03K17/955 ,  H03K17/96 ,  G01R31/327

Abstract: A differential touch sensor apparatus for detecting the presence of an object such as a human appendage, the apparatus having a first electrode (16), a second electrode (18) positioned proximate to the first electrode, a differential circuit (Q1, Q2, 34, 48) connected to the first and second electrodes, and a pulse or other signal source (60) 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 (22) 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.

公开(公告)号：HK1020302A1

公开(公告)日：2000-04-07

申请号：HK99105410

申请日：1999-11-23

Applicant: TOUCH SENSOR TECHNOLOGIES LLC

Inventor： CALDWELL DAVID W

IPC: G01B7/00 ,  H03K17/955 ,  H03K17/96 ,  H03K

公开(公告)号：CA2203695A1

公开(公告)日：1996-05-02

申请号：CA2203695

申请日：1995-10-25

Applicant: TOUCH SENSOR TECHNOLOGIES LLC

Inventor： CALDWELL DAVID W

IPC: H03K17/955 ,  H03K17/96

Abstract: A low impedance touch sensor detects manual contact of a dielectric substrate (10) by a human user. The touch sensor includes a first conductive electrode pad (16) having a closed, continuous geometric form and a second conductive electrode (18) which substantially surrounds the first electrode in a spaced apart, coplanar relationship by a channel (20). The first and second electrodes are disposed on the same planar undersurface (14) of the substrate. An active electrical component (26), such as a transistor, is located on the substrate proximate the first and second electrodes, and is electrically coupled to the first and second electrodes.

公开(公告)号：NZ296672A

公开(公告)日：2000-09-29

申请号：NZ29667295

申请日：1995-10-25

Applicant: TOUCH SENSOR TECHNOLOGIES LLC

Inventor： CALDWELL DAVID W

IPC: H03K17/955 ,  H03K17/96 ,  G06F3/02 ,  H01G7/00 ,  H03K17/94

Abstract: A low impedance touch sensor detects manual contact of a dielectric substrate 10 by a human user. The sensor includes a conductive electrode pad 16, surrounded by an electrode 18, spaced apart by channel 20. The two electrodes are placed on the undersurface of the dielectric substrate, with the user's touch contact being applied to the opposite surface. An active electrical component, such as a transistor 26 is located on the substrate and connecting the two electrodes. A resistor 28 may also connect the electrodes. The electrode 18 is connected to a strobe line 22, while one terminal of the transistor is connected to sense line 24.