WO2004025402A3 - Rf absorption switching for keyboard signaling - Google Patents

Rf absorption switching for keyboard signaling Download PDF

Info

Publication number
WO2004025402A3
WO2004025402A3 PCT/US2003/028179 US0328179W WO2004025402A3 WO 2004025402 A3 WO2004025402 A3 WO 2004025402A3 US 0328179 W US0328179 W US 0328179W WO 2004025402 A3 WO2004025402 A3 WO 2004025402A3
Authority
WO
WIPO (PCT)
Prior art keywords
resonant tank
energy
absorption
tank circuit
sensor device
Prior art date
Application number
PCT/US2003/028179
Other languages
French (fr)
Other versions
WO2004025402A2 (en
Inventor
Roy J Lahr
Original Assignee
Rast Associates Llc
Roy J Lahr
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 Rast Associates Llc, Roy J Lahr filed Critical Rast Associates Llc
Priority to AU2003274959A priority Critical patent/AU2003274959A1/en
Publication of WO2004025402A2 publication Critical patent/WO2004025402A2/en
Publication of WO2004025402A3 publication Critical patent/WO2004025402A3/en

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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

Abstract

A keyboard device (10) includes a plurality of keybutton (140), a resonant tank circuit (120) corresponding to each of the plurality of keybuttons (140), each resonant tank circuit (120) configured to absorb energy at a respective predetermined frequency, a sensor device (80) configured to sense absorption of energy by the resonant tank circuit at the predetermined frequencies, an emitter device (70) configured to emit energy in a path of the resonant tank circuits toward the sensor device, and a determination device configured to determine a depression state of the keybuttons in accordance with absorption, sensed by the sensor device, at the predetermined frequencies of the energy emitted by the emitter device.
PCT/US2003/028179 2002-09-10 2003-09-10 Rf absorption switching for keyboard signaling WO2004025402A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003274959A AU2003274959A1 (en) 2002-09-10 2003-09-10 Rf absorption switching for keyboard signaling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40995302P 2002-09-10 2002-09-10
US60/409,953 2002-09-10

Publications (2)

Publication Number Publication Date
WO2004025402A2 WO2004025402A2 (en) 2004-03-25
WO2004025402A3 true WO2004025402A3 (en) 2004-11-25

Family

ID=31994037

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/028179 WO2004025402A2 (en) 2002-09-10 2003-09-10 Rf absorption switching for keyboard signaling

Country Status (2)

Country Link
AU (1) AU2003274959A1 (en)
WO (1) WO2004025402A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2570533B (en) 2017-12-20 2021-09-22 Sonuus Ltd Keyboard sensor systems and methods
GB2578346B (en) 2018-08-07 2021-03-03 Sonuus Ltd Computer input devices

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818472A (en) * 1972-05-26 1974-06-18 K Mauk R.f. system for detecting unauthorized travel of articles through a selected zone
US5378069A (en) * 1992-08-24 1995-01-03 Product Engineering & Mfg., Inc. Environmentally safe touch typing keyboard
US5677688A (en) * 1991-09-06 1997-10-14 David Sarnoff Research Center, Inc. Optomechanical information entry device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818472A (en) * 1972-05-26 1974-06-18 K Mauk R.f. system for detecting unauthorized travel of articles through a selected zone
US5677688A (en) * 1991-09-06 1997-10-14 David Sarnoff Research Center, Inc. Optomechanical information entry device
US5378069A (en) * 1992-08-24 1995-01-03 Product Engineering & Mfg., Inc. Environmentally safe touch typing keyboard

Also Published As

Publication number Publication date
AU2003274959A8 (en) 2004-04-30
WO2004025402A2 (en) 2004-03-25
AU2003274959A1 (en) 2004-04-30

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