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1. WO2000044018 - CAPACITIVE SENSOR AND ARRAY

Publication Number WO/2000/044018
Publication Date 27.07.2000
International Application No. PCT/US2000/001948
International Filing Date 26.01.2000
Chapter 2 Demand Filed 23.08.2000
IPC
G01D 5/24 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
24by varying capacitance
H03K 17/955 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and -breaking
94characterised by the way in which the control signals are generated
945Proximity switches
955using a capacitive detector
H03K 17/96 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and -breaking
94characterised by the way in which the control signals are generated
96Touch switches
CPC
G01D 5/2405
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
24by varying capacitance
2405by varying dielectric
H03K 17/955
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and –breaking
94characterised by the way in which the control signals are generated
945Proximity switches
955using a capacitive detector
H03K 17/962
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and –breaking
94characterised by the way in which the control signals are generated
96Touch switches
962Capacitive touch switches
H03K 17/9622
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and –breaking
94characterised by the way in which the control signals are generated
96Touch switches
962Capacitive touch switches
9622using a plurality of detectors, e.g. keyboard
H03K 2017/9604
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
17Electronic switching or gating, i.e. not by contact-making and –breaking
94characterised by the way in which the control signals are generated
96Touch switches
9602characterised by the type or shape of the sensing electrodes
9604characterised by the number of electrodes
H03K 2217/960725
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
2217Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
94characterised by the way in which the control signal is generated
96Touch switches
9607Capacitive touch switches
96071characterised by the detection principle
960725Charge-transfer
Applicants
  • PHILIPP, Harald [US/GB]; GB
Inventors
  • PHILIPP, Harald; GB
Agents
  • KIEWIT, David; 5901 Third St. South St. Petersburg, FL 33705-5305, US
Priority Data
60/117,32626.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CAPACITIVE SENSOR AND ARRAY
(FR) CAPTEUR CAPACITIF ET MONTAGE
Abstract
(EN)
Proximity of a body, which may be a user's finger, to an electrode pair (100, 104) is sensed by a charge transfer capacitive measurement approach. The electrode pair (100, 104) thus act as a key (10) that can be arrayed with other electrode pairs to form a keypad, keyboard, linear slider control, or liquid level sensor. In one embodiment of the invention, each key is associated with an alternating voltage source (101) and a pair of electrodes (100, 104) mounted on or within a solid dielectric substrate (103) or panel so as to be separated from each other by a gap. The voltage source (101) is connected to a driven electrode (100), a sampling charge detector (402) is connected to a second, receiving, electrode (104), and the output of the charge detector is, in turn, fed into an amplifier (403) and a charge measurement means (407). Disturbances in coupling between the two electrodes (100, 104) are detected through the solid substrate or panel material (103) when a substance or object approaches or contacts the panel. The receiving electrode (104) is a low-impedance node during the sampling phase of the process, which aids in keeping the sensor from being affected by wiring length or extraneous objects near an output lead.
(FR)
La proximité d'un corps, qui peut être le doigt d'un utilisateur, par rapport à une paire d'électrodes (100, 104), est détectée par mesure capacitive de transfert de charge. La paire d'électrodes (100, 104) agit donc comme une touche (10) susceptible d'être montée en association avec d'autres paires d'électrodes pour former un clavier, un curseur de défilement linéaire ou un capteur de niveau de liquide. Selon une variante, chaque touche est associée à une source de tension en courant alternatif (101) et à une paire d'électrodes (100, 104) montée sur ou dans un substrat ou un panneau diélectrique solide (103), selon une configuration prévoyant un intervalle d'espacement mutuel. La source de tension (101) est reliée à une électrode excitée (100), un détecteur de charge d'échantillonnage (402) est relié à une seconde électrode de réception (104), et les signaux de sortie du détecteur de charge sont eux-mêmes injectés dans un amplificateur (403) et dans un système de mesure de charge (407). Les perturbations relatives au couplage entre les deux électrodes (100, 104) sont décelées via le substrat ou le panneau solide (103) lorsqu'une substance ou un objet approche le panneau ou vient en contact avec lui. L'électrode de réception (104) tient lieu de noeud à faible impédance durant la phase d'échantillonnage du processus, ce qui affranchit plus facilement le capteur de l'influence de la longueur du câblage ou de la présence d'objets externes à proximité d'un conducteur de sortie.
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