WO2006133084A3 - Methods and systems for guarding a charge transfer capacitance sensor for proximity detection - Google Patents

Methods and systems for guarding a charge transfer capacitance sensor for proximity detection Download PDF

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Publication number
WO2006133084A3
WO2006133084A3 PCT/US2006/021727 US2006021727W WO2006133084A3 WO 2006133084 A3 WO2006133084 A3 WO 2006133084A3 US 2006021727 W US2006021727 W US 2006021727W WO 2006133084 A3 WO2006133084 A3 WO 2006133084A3
Authority
WO
WIPO (PCT)
Prior art keywords
charge transfer
proximity detection
guarding
systems
methods
Prior art date
Application number
PCT/US2006/021727
Other languages
French (fr)
Other versions
WO2006133084A2 (en
Inventor
Joseph Kurth Reynolds
Original Assignee
Synaptics Inc
Joseph Kurth Reynolds
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 Synaptics Inc, Joseph Kurth Reynolds filed Critical Synaptics Inc
Priority to JP2008514958A priority Critical patent/JP5285423B2/en
Priority to EP06772142A priority patent/EP1905154A2/en
Priority to KR1020077028230A priority patent/KR101245117B1/en
Priority to CN2006800194937A priority patent/CN101283507B/en
Publication of WO2006133084A2 publication Critical patent/WO2006133084A2/en
Publication of WO2006133084A3 publication Critical patent/WO2006133084A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • 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
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector
    • 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
    • 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
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • 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
    • H03K2017/9602—Touch switches characterised by the type or shape of the sensing electrodes
    • 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
    • H03K2217/96058—Fail-safe touch switches, where switching takes place only after repeated touch
    • 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
    • H03K2217/96071—Capacitive touch switches characterised by the detection principle
    • H03K2217/960725—Charge-transfer
    • 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
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches
    • H03K2217/960775—Emitter-receiver or "fringe" type detection, i.e. one or more field emitting electrodes and corresponding one or more receiving electrodes

Abstract

Methods, systems and devices are described for determining a measurable capacitance for proximity detection in a sensor having a plurality of sensing electrodes and at least one guarding electrode. A charge transfer process is executed for at least two executions. The charge transfer process includes applying a pre-determined voltage to at least one of the plurality of sensing electrodes using a first switch, applying a first guard voltage to the at least one guarding electrode using a second switch, sharing charge between the at least one of the plurality of sensing electrodes and a filter capacitance, and applying a second guard voltage different from the first guard voltage to the at least one guarding electrode. A voltage is measured on the filter capacitance for a number of measurements equal to at least one to produce at least one result to determine the measurable capacitance for proximity detection.
PCT/US2006/021727 2005-06-03 2006-06-03 Methods and systems for guarding a charge transfer capacitance sensor for proximity detection WO2006133084A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2008514958A JP5285423B2 (en) 2005-06-03 2006-06-03 Method and system for protecting a charge transfer capacitive sensor for proximity detection
EP06772142A EP1905154A2 (en) 2005-06-03 2006-06-03 Methods and systems for guarding a charge transfer capacitance sensor for proximity detection
KR1020077028230A KR101245117B1 (en) 2005-06-03 2006-06-03 Methods and systems for guarding a charge transfer capacitance sensor for proximity detection
CN2006800194937A CN101283507B (en) 2005-06-03 2006-06-03 Methods and systems for protecting charge transfer capacitance sensor for proximity detection

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
US68703905P 2005-06-03 2005-06-03
US68716705P 2005-06-03 2005-06-03
US68701205P 2005-06-03 2005-06-03
US68703705P 2005-06-03 2005-06-03
US68714805P 2005-06-03 2005-06-03
US60/687,039 2005-06-03
US60/687,167 2005-06-03
US60/687,037 2005-06-03
US60/687,012 2005-06-03
US60/687,148 2005-06-03
US77484306P 2006-02-16 2006-02-16
US60/774,843 2006-02-16

Publications (2)

Publication Number Publication Date
WO2006133084A2 WO2006133084A2 (en) 2006-12-14
WO2006133084A3 true WO2006133084A3 (en) 2007-03-08

Family

ID=38007337

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2006/021725 WO2006133082A1 (en) 2005-06-03 2006-06-03 Methods and systems for detecting a capacitance using switched charge transfer techniques
PCT/US2006/021727 WO2006133084A2 (en) 2005-06-03 2006-06-03 Methods and systems for guarding a charge transfer capacitance sensor for proximity detection

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2006/021725 WO2006133082A1 (en) 2005-06-03 2006-06-03 Methods and systems for detecting a capacitance using switched charge transfer techniques

Country Status (5)

Country Link
US (5) US7262609B2 (en)
EP (3) EP1905154A2 (en)
JP (3) JP5395429B2 (en)
KR (3) KR101340860B1 (en)
WO (2) WO2006133082A1 (en)

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