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Planar capacitive proximity sensor

Info

Publication number
WO2009102228A3
WO2009102228A3 PCT/RS2009/000005 RS2009000005W WO2009102228A3 WO 2009102228 A3 WO2009102228 A3 WO 2009102228A3 RS 2009000005 W RS2009000005 W RS 2009000005W WO 2009102228 A3 WO2009102228 A3 WO 2009102228A3
Authority
WO
Grant status
Application
Patent type
Prior art keywords
electrodes
object
capacitor
capacity
air
Prior art date
Application number
PCT/RS2009/000005
Other languages
French (fr)
Other versions
WO2009102228A2 (en )
Inventor
Boban Stojanovic
Original Assignee
Boban Stojanovic
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

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making or -braking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making or -braking characterised by the way in which the control signal is generated
    • H03K17/945Proximity switches
    • H03K17/955Proximity switches using a capacitive detector

Abstract

Planar capacitive sensor consists of two electrodes, which are in the same plane, and most often, are carried out on a printed circuit board as two surfaces of a conductive material. In case there is no object of detection and since the distance between the electrodes is relatively long, capacitance that is made between the electrodes approximately equals zero. Because the electrodes are extremely thin less than 0.1mm and the area between them relatively large about 1cm, the capacitance which these electrodes make can be considered as 0. When there is no object the surface of the equivalent capacitor is somewhere near 1cm therefore C, proportionally 0.0001 times dialectic air constant plus parasitive capacitor made of two plates in the same plane which have isolator on one side (printed plate), and on the other thin varnish which coats conductor and the air. When the object is near electrodes of size about 1cm or less a capacitor is formed between the first electrode E1 and the object as well as between the object and the second electrode, E2. Total capacity between E1 and E2 is serial connection of these two capacitors. Since the surface between the electrodes and the object is now about 1 cm x 1 cm and the distance is 1 cm, capacity of the equivalent capacitor is proportional to 0.01 times dialectic air constant or some other isolator, in case electrodes are in an isolator. From the picture 1 it is seen that amplification of the capacity is about 100 times.
PCT/RS2009/000005 2008-02-14 2009-02-13 Planar capacitive proximity sensor WO2009102228A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
RSP-2008/0063 2008-02-14
RSP20080063 2008-02-14

Publications (2)

Publication Number Publication Date
WO2009102228A2 true WO2009102228A2 (en) 2009-08-20
WO2009102228A3 true true WO2009102228A3 (en) 2009-10-08

Family

ID=40718735

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RS2009/000005 WO2009102228A3 (en) 2008-02-14 2009-02-13 Planar capacitive proximity sensor

Country Status (1)

Country Link
WO (1) WO2009102228A3 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054306A1 (en) * 1980-12-17 1982-06-23 Bosch-Siemens Hausgeräte GmbH Capacitive touch switch for electrical domestic appliances
GB2157080A (en) * 1984-04-05 1985-10-16 Ti Capacitive switches
US5867111A (en) * 1993-03-29 1999-02-02 Donnelly Technology, Inc. Touch control system
DE102004026672A1 (en) * 2004-05-28 2005-12-29 Schott Ag Contact switch has electrically conducting layer arranged on side remote from user structured in at least one electrically isolated flat region defining at least one capacitive contact or touch sensor electrode

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054306A1 (en) * 1980-12-17 1982-06-23 Bosch-Siemens Hausgeräte GmbH Capacitive touch switch for electrical domestic appliances
GB2157080A (en) * 1984-04-05 1985-10-16 Ti Capacitive switches
US5867111A (en) * 1993-03-29 1999-02-02 Donnelly Technology, Inc. Touch control system
DE102004026672A1 (en) * 2004-05-28 2005-12-29 Schott Ag Contact switch has electrically conducting layer arranged on side remote from user structured in at least one electrically isolated flat region defining at least one capacitive contact or touch sensor electrode

Also Published As

Publication number Publication date Type
WO2009102228A2 (en) 2009-08-20 application

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