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EMI resistant balanced touch sensor and method

A touch sensor, sensor technology, applied in the direction of electrical components, pulse technology, electronic switches, etc., can solve problems such as non-compliance with electromagnetic compatibility

Inactive Publication Date: 2007-08-15
TOUCHSENSOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Other existing touch-sensing systems also generate electromagnetic interference (EMI) to the environment in unpredictable ways and may not comply with increasingly stringent electromagnetic compatibility (EMC) standards

Method used

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  • EMI resistant balanced touch sensor and method
  • EMI resistant balanced touch sensor and method
  • EMI resistant balanced touch sensor and method

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Embodiment Construction

[0037] Referring to the exemplary embodiment shown in FIGS. 1-5, the EMI resistant balanced touch sensor 20 includes conductive traces on a printed circuit board or substrate 21 with a balanced board sensor electrode pattern, It has a first plate or inner electrode 22 within a second or outer electrode 24 . The second electrode 24 defines a conductive surface area substantially equal to the plate surface area of ​​the first electrode 22 . An optional conductive ground ring 25 at least partially surrounds the second electrode 24 to isolate one plate electrode from the other plate electrode or the surrounding environment. As shown in FIG. 1 , the electric field lines 27 of the touch sensor sense the presence of a user's finger, a metal object, or a liquid / gas interface.

[0038] A single touchpad sensor 20 is attached to an insulating substrate 21 as shown in FIG. 1 . Substrate 21 preferably has a substantially uniform thickness and can be made of any type of structurally supp...

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PUM

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Abstract

An EMI resistant, low impedance touch sensor detects contact of a dielectric substrate by an operator's appendage or body part, a metal object, or the proximity of a moving fluid / gas interface. The touch sensor includes a first conductive electrode pad and a second conductive electrode of substantially equal area which is spaced from the first electrode by a channel of non-conductive dielectric. The first and second electrodes are optionally disposed on the same surface of the substrate. An active electrical component including an oscillator and a differential sensing circuit is located on the substrate proximate the first and second electrodes and is electrically coupled to the first and second electrodes. Noise or interference signals appearing on both the first and second electrodes, being of substantially equal area, are subtracted from one another through to provide common mode rejection of EMI.

Description

technical field [0001] The present invention relates to sensors or control actuators for detecting the presence of an operator's limb or body part, a metallic object, or the proximity of a moving liquid / gas interface. Background technique [0002] Electronic or capacitive solid-state switches and touch panels are used in a variety of applications to replace traditional mechanical switches for applications including cooktops, microwave ovens, and more. Unlike mechanical switches, touch panels include no moving parts that could break or become damaged. Mechanical switches used with substrates require some type of opening through the substrate to mount the switch. These openings, as well as the openings themselves in the switch, allow dust, water and other contaminants to pass through the substrate and collect within the switch. Certain environments include relatively large amounts of contaminants that can pass through substrate openings, causing electrical shorts or damage t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/96
CPCH03K2017/9602H03K17/962H03K17/96
Inventor 罗杰·D·布尔迪迈克尔·乔恩·泰勒
Owner TOUCHSENSOR TECH
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