WO1991011054A1 - Detecteur a commande par effleurement - Google Patents

Detecteur a commande par effleurement Download PDF

Info

Publication number
WO1991011054A1
WO1991011054A1 PCT/GB1991/000032 GB9100032W WO9111054A1 WO 1991011054 A1 WO1991011054 A1 WO 1991011054A1 GB 9100032 W GB9100032 W GB 9100032W WO 9111054 A1 WO9111054 A1 WO 9111054A1
Authority
WO
WIPO (PCT)
Prior art keywords
pad
touch
detecting means
sensing device
touch pad
Prior art date
Application number
PCT/GB1991/000032
Other languages
English (en)
Inventor
York Liao
Michael Y. S. Chan
Original Assignee
Varitronix Limited
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
Priority claimed from GB909000624A external-priority patent/GB9000624D0/en
Application filed by Varitronix Limited filed Critical Varitronix Limited
Publication of WO1991011054A1 publication Critical patent/WO1991011054A1/fr

Links

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
    • H03K17/96—Touch switches
    • H03K17/9645—Resistive touch switches

Definitions

  • the invention relates to touch sensing devices.
  • Touch sensing devices are known in which a single switching arrangement or a multiple selective position sensing arrangement is achieved by touching the device itself or a chosen part of the device respectively. Such devices may make use of membrane switches, optical sensing or electrical capacitive changes.
  • capacitive touch sensing devices are provided with electrically insulating membranes or resin coatings on their operative or exposed surfaces and generally have the drawbacks of poor reliability and poor sensitivity.
  • a touch sensing device comprises an electrically conductive touch pad supported on a insulating substrate, and detecting means electrically connected to the touch pad via a capacitive blocking filter to prevent static electrical charges being applied to the detecting means, wherein' he detecting means detects a change in the impedance at the touch pad caused by a user directly touching the touch pad, in which the detecting means includes an oscillator whose output frequency varies with the change in input impedance.
  • the capacitive touch sensing device may include two or more touch pads each with a respective capacitive blocking filter, and a multiplexer to sequentially connect each capacitor, and hence each touch pad, to the detecting means.
  • the touch pads may each be arranged adjacent a grounded pad such that in use the touch pad can be effectively and selectively bridged to ground when the touch pad is touched by the user.
  • the touch pads may be arranged adjacently in electrically parallel pairs.
  • Fig. 1 is a schematic circuit diagram of the device; and Fig. 2 shows a top view of part of a touch sensing pad. •
  • a touch sensitive pad consists of a number of electrically conductive pads ⁇ o and a surrounding conductive pad 11 supported by an insulating substrate 9.
  • Each pad 10 is electrically connected via a respective blocking capacitor 12 to an analogue multiplexer 13.
  • the surrounding pad 11 is connected to ground.
  • the output of the multiplexer 13 is connected to an oscillator 14.
  • a resistor 15, which may be adjustable, and/or a capacitor 16, which may also be adjustable, are connected to the RC ports of the oscillator 14.
  • the oscillator 14 responds to vary its output frequency from its quiescent frequency. This variation of frequency represents that the pad has been touched and by simultaneously sensing the sequencing of the multiplexer 13, which of the conductive pads 10 that has been touched by the finger is also determined. In this way, whenever the pad is touched, that touching and the position of the finger is determined.
  • the body provides an impedance between the pads 10 and 11 which is effective to change the effective input impedance to the oscillator 14.
  • the detector oscillator 14 responds to such changes in impedance in its input circuit.
  • a touch pad is formed with one or more exposed conductive pads 10 as above except that the surrounding pad 11 is omitted.
  • Each pad 10 is connected via a respective capacitor to the oscillator.
  • the multiplexer 13 is provided where required.
  • the blocking filters 12 prevent static electricity charges being applied to the input of the oscillator. Such charges may be considerable in use and would otherwise destroy the integrated circuit components of the oscillator 14.
  • the capacitors 12 have a preferred value of 100 to 1000 p F .
  • the oscillator frequency is preferably about 100 KH Z .
  • a suitable oscillator is a multivibrator Model CD 4047 supplied by Record Company of America (RCA) .
  • the filters 12 are also filter out direct current components and some electrical noise from a finger applied to the touch pad.
  • touch sensitive pads described have exposed conductive pads which are touched directly in use; this contrasts to the prior art capacitive touch pads.
  • the described pads are simpler to manufacture and have been found to lead to generally more reliable and sensitive operation.
  • the capacitive touch sensing device is used with a display such as a CRT display or, more preferably, a liquid crystal display.
  • the conductive pads are transparent and may be formed, for example, from a deposit of tin oxide laid on the front surface of the display.
  • the device responds in practice to the changes brought about by directly touching the pads which normally result from one or more of the following:-

Landscapes

  • Electronic Switches (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Push-Button Switches (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Position Input By Displaying (AREA)

Abstract

Element sensible à l'effleurement consistant en un certain nombre d'éléments conducteurs électriques (10) entourés par un élément conducteur (11). Chaque élément (10) est connecté par l'intermédiaire d'un filtre de blocage de capacité respectif à un multiplexeur (13) et à un oscillateur (14). Lorsque l'élément sensible à l'effleurement est touché directement pour établir un pont effectif entre l'un des éléments (10) et l'élément périphérique (11), la modification de l'impédance effective est détectée par une variation résultante de la fréquence de l'oscillateur (14).
PCT/GB1991/000032 1990-01-11 1991-01-10 Detecteur a commande par effleurement WO1991011054A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB909000624A GB9000624D0 (en) 1990-01-11 1990-01-11 Touch sensing device
GB9000624.8 1990-01-11
GB9020766.3 1990-09-24
GB9020766A GB2241064B (en) 1990-01-11 1990-09-24 Touch sensing device

Publications (1)

Publication Number Publication Date
WO1991011054A1 true WO1991011054A1 (fr) 1991-07-25

Family

ID=26296483

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000032 WO1991011054A1 (fr) 1990-01-11 1991-01-10 Detecteur a commande par effleurement

Country Status (4)

Country Link
EP (1) EP0510057A1 (fr)
AU (1) AU636003B2 (fr)
CA (1) CA2073676A1 (fr)
WO (1) WO1991011054A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5511231A (en) * 1993-06-21 1996-04-23 Nec Corporation Selective calling receiver capable of stopping a notifying operation by touching a chain clip
US8424350B2 (en) 2009-06-19 2013-04-23 Projections Yoogo Inc. Personal security key holder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5036321A (en) * 1989-08-31 1991-07-30 Otis Elevator Company Capacitive sensing, solid state touch button system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2727522A1 (de) * 1977-06-18 1979-01-04 Licentia Gmbh Sensorschaltfeld, insbesondere fuer einen fernsehempfaenger
EP0080613A1 (fr) * 1981-11-26 1983-06-08 Inventio Ag Dispositif de commutation capacitif commandé par effleurement
WO1985003820A1 (fr) * 1984-02-16 1985-08-29 Antikidis Jean Pierre Procede pour scruter un clavier a touches capacitives et un clavier assorti de moyens pour scruter un clavier selon ce procede

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2727522A1 (de) * 1977-06-18 1979-01-04 Licentia Gmbh Sensorschaltfeld, insbesondere fuer einen fernsehempfaenger
EP0080613A1 (fr) * 1981-11-26 1983-06-08 Inventio Ag Dispositif de commutation capacitif commandé par effleurement
WO1985003820A1 (fr) * 1984-02-16 1985-08-29 Antikidis Jean Pierre Procede pour scruter un clavier a touches capacitives et un clavier assorti de moyens pour scruter un clavier selon ce procede

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5511231A (en) * 1993-06-21 1996-04-23 Nec Corporation Selective calling receiver capable of stopping a notifying operation by touching a chain clip
US8424350B2 (en) 2009-06-19 2013-04-23 Projections Yoogo Inc. Personal security key holder

Also Published As

Publication number Publication date
AU636003B2 (en) 1993-04-08
EP0510057A1 (fr) 1992-10-28
CA2073676A1 (fr) 1991-07-12
AU7064891A (en) 1991-08-05

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