WO2003005293A3 - Apparatus for sensing the position of a pointing object - Google Patents

Apparatus for sensing the position of a pointing object Download PDF

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Publication number
WO2003005293A3
WO2003005293A3 PCT/IB2002/002494 IB0202494W WO03005293A3 WO 2003005293 A3 WO2003005293 A3 WO 2003005293A3 IB 0202494 W IB0202494 W IB 0202494W WO 03005293 A3 WO03005293 A3 WO 03005293A3
Authority
WO
WIPO (PCT)
Prior art keywords
keyboard
operator
pair
sensing
electrode
Prior art date
Application number
PCT/IB2002/002494
Other languages
French (fr)
Other versions
WO2003005293A2 (en
Inventor
Hans Rudolf Sterling
Original Assignee
Hans Rudolf Sterling
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 Hans Rudolf Sterling filed Critical Hans Rudolf Sterling
Priority to US10/482,356 priority Critical patent/US6998856B2/en
Priority to AU2002321680A priority patent/AU2002321680A1/en
Publication of WO2003005293A2 publication Critical patent/WO2003005293A2/en
Publication of WO2003005293A3 publication Critical patent/WO2003005293A3/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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Abstract

A computer system (10) includes a keyboard (11), a first pair of position-sensing electrodes (18.1 and 18.2), a second pair of position-sensing electrodes (20.1 and 20.2), a signal injection electrode (22) and an oscillator (27). The oscillator injects a signal via the electrode (22) and the operators left hand L, creating a field around the operator's right hand R. The position sensing electrodes are arranged underneath the keyboard and sense the strenght of the field enabling the position of the operator's right hand R in an X-Y plane above the keyboard to be determined. Each position-sensing electrode is coupled to a difference amplifier (28 and 38) via a pair of buffer amplifiers (40.1, 40.2 and 30.1, 30.2). The amplification factor of the buffer amplifiers can be varied so as to scale the field strength values sensed by the electrodes, thereby permitting the output of the difference amplifier to be varied so as to adjust the sensivity of the system to different positions of the operator's hand R.
PCT/IB2002/002494 2001-06-29 2002-06-28 Apparatus for sensing the position of a pointing object WO2003005293A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/482,356 US6998856B2 (en) 2001-06-29 2002-06-28 Apparatus for sensing the position of a pointing object
AU2002321680A AU2002321680A1 (en) 2001-06-29 2002-06-28 Apparatus for sensing the position of a pointing object

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200105403 2001-06-29
ZA2001/5403 2001-06-29

Publications (2)

Publication Number Publication Date
WO2003005293A2 WO2003005293A2 (en) 2003-01-16
WO2003005293A3 true WO2003005293A3 (en) 2004-07-22

Family

ID=25589221

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2002/002494 WO2003005293A2 (en) 2001-06-29 2002-06-28 Apparatus for sensing the position of a pointing object

Country Status (3)

Country Link
US (1) US6998856B2 (en)
AU (1) AU2002321680A1 (en)
WO (1) WO2003005293A2 (en)

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Also Published As

Publication number Publication date
US6998856B2 (en) 2006-02-14
AU2002321680A1 (en) 2003-01-21
WO2003005293A2 (en) 2003-01-16
US20040178995A1 (en) 2004-09-16

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