WO2004109925A3 - Acoustic wave touch detection circuit and method - Google Patents

Acoustic wave touch detection circuit and method Download PDF

Info

Publication number
WO2004109925A3
WO2004109925A3 PCT/US2004/018122 US2004018122W WO2004109925A3 WO 2004109925 A3 WO2004109925 A3 WO 2004109925A3 US 2004018122 W US2004018122 W US 2004018122W WO 2004109925 A3 WO2004109925 A3 WO 2004109925A3
Authority
WO
WIPO (PCT)
Prior art keywords
acoustic wave
detection circuit
touch detection
controller
wave touch
Prior art date
Application number
PCT/US2004/018122
Other languages
French (fr)
Other versions
WO2004109925A2 (en
Inventor
Terence J Knowles
Wayne J Wehrer
Chris Kalmus
Iii Charles F Brenigan
Original Assignee
Texzec Inc
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 Texzec Inc filed Critical Texzec Inc
Priority to EP04754673A priority Critical patent/EP1642260B1/en
Publication of WO2004109925A2 publication Critical patent/WO2004109925A2/en
Publication of WO2004109925A3 publication Critical patent/WO2004109925A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • G06F3/0436—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/054—Acoustic pick-up, e.g. ultrasonic
    • 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
    • H03K2217/96003—Touch switches using acoustic waves, e.g. ultrasound
    • H03K2217/96011—Touch switches using acoustic waves, e.g. ultrasound with propagation, SAW or BAW

Abstract

A circuit for an acoustic wave switch or sensor (10) having a resonant acoustic wave cavity detects a touch or sensed event using a time domain approach. The circuit includes a controller that drives an acoustic wave transducer (12, 12’) to generate a resonant acoustic wave in the acoustic wave cavity (14, 14’) during a first portion of a sampling cycle. In a second portion of the sampling cycle, the controller (30) monitors the time that it takes for the acoustic wave signal from the transducer to decay to a predetermined level, based on the decay time, the controller detects a sensed event, such as a touch on the acoustic wave switch/sensor.
PCT/US2004/018122 2003-06-04 2004-06-02 Acoustic wave touch detection circuit and method WO2004109925A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04754673A EP1642260B1 (en) 2003-06-04 2004-06-02 Acoustic wave touch detection circuit and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/454,003 2003-06-04
US10/454,003 US7265746B2 (en) 2003-06-04 2003-06-04 Acoustic wave touch detection circuit and method

Publications (2)

Publication Number Publication Date
WO2004109925A2 WO2004109925A2 (en) 2004-12-16
WO2004109925A3 true WO2004109925A3 (en) 2005-12-01

Family

ID=33489636

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/018122 WO2004109925A2 (en) 2003-06-04 2004-06-02 Acoustic wave touch detection circuit and method

Country Status (3)

Country Link
US (2) US7265746B2 (en)
EP (1) EP1642260B1 (en)
WO (1) WO2004109925A2 (en)

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Also Published As

Publication number Publication date
WO2004109925A2 (en) 2004-12-16
US7265746B2 (en) 2007-09-04
US20040246239A1 (en) 2004-12-09
EP1642260B1 (en) 2012-12-12
US7812269B2 (en) 2010-10-12
US20070261895A1 (en) 2007-11-15
EP1642260A4 (en) 2007-08-08
EP1642260A2 (en) 2006-04-05

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