WO2008039924A3 - Touch switch with reduced susceptibility to electrical interference - Google Patents

Touch switch with reduced susceptibility to electrical interference Download PDF

Info

Publication number
WO2008039924A3
WO2008039924A3 PCT/US2007/079725 US2007079725W WO2008039924A3 WO 2008039924 A3 WO2008039924 A3 WO 2008039924A3 US 2007079725 W US2007079725 W US 2007079725W WO 2008039924 A3 WO2008039924 A3 WO 2008039924A3
Authority
WO
WIPO (PCT)
Prior art keywords
touch switch
electrical interference
reduced susceptibility
electrical
susceptibility
Prior art date
Application number
PCT/US2007/079725
Other languages
French (fr)
Other versions
WO2008039924A2 (en
Inventor
David Malcolm Howie
Jeffrey Patrick Rudd
Original Assignee
Illinois Tool Works
David Malcolm Howie
Jeffrey Patrick Rudd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Illinois Tool Works, David Malcolm Howie, Jeffrey Patrick Rudd filed Critical Illinois Tool Works
Publication of WO2008039924A2 publication Critical patent/WO2008039924A2/en
Publication of WO2008039924A3 publication Critical patent/WO2008039924A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/94052—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated with evaluation of actuation pattern or sequence, e.g. tapping
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960705—Safety of capacitive touch and proximity switches, e.g. increasing reliability, fail-safe

Abstract

An electrical touch switch (10) employs an excitation signal (16) encoded with a predetermined pattern (30) to improve discrimination against electromagnetic interference (42).
PCT/US2007/079725 2006-09-27 2007-09-27 Touch switch with reduced susceptibility to electrical interference WO2008039924A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82716306P 2006-09-27 2006-09-27
US60/827,163 2006-09-27

Publications (2)

Publication Number Publication Date
WO2008039924A2 WO2008039924A2 (en) 2008-04-03
WO2008039924A3 true WO2008039924A3 (en) 2008-06-12

Family

ID=39230978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/079725 WO2008039924A2 (en) 2006-09-27 2007-09-27 Touch switch with reduced susceptibility to electrical interference

Country Status (1)

Country Link
WO (1) WO2008039924A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112011101946T5 (en) 2010-06-08 2013-05-02 Iee International Electronics & Engineering S.A. Robust capacitive measuring system
DE112011101945T5 (en) 2010-06-08 2013-04-04 Iee International Electronics & Engineering S.A. Robust capacitive measuring system
US8988080B2 (en) 2010-06-08 2015-03-24 Iee International Electronics & Engineering S.A. Capacitive measurement system with increased robustness against electro-magnetic interference

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215366A (en) * 1977-10-19 1980-07-29 Feature Film Services Subscriber-limited reception television broadcast security encoder-decoder system
US5920310A (en) * 1996-11-15 1999-07-06 Synaptics, Incorporated Electronic device employing a touch sensitive transducer
US20020050983A1 (en) * 2000-09-26 2002-05-02 Qianjun Liu Method and apparatus for a touch sensitive system employing spread spectrum technology for the operation of one or more input devices
US7046230B2 (en) * 2001-10-22 2006-05-16 Apple Computer, Inc. Touch pad handheld device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215366A (en) * 1977-10-19 1980-07-29 Feature Film Services Subscriber-limited reception television broadcast security encoder-decoder system
US5920310A (en) * 1996-11-15 1999-07-06 Synaptics, Incorporated Electronic device employing a touch sensitive transducer
US20020050983A1 (en) * 2000-09-26 2002-05-02 Qianjun Liu Method and apparatus for a touch sensitive system employing spread spectrum technology for the operation of one or more input devices
US7046230B2 (en) * 2001-10-22 2006-05-16 Apple Computer, Inc. Touch pad handheld device

Also Published As

Publication number Publication date
WO2008039924A2 (en) 2008-04-03

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