WO2006024475A1 - Dispositif sensible et procede pour faire fonctionner un tel dispositif sensible - Google Patents

Dispositif sensible et procede pour faire fonctionner un tel dispositif sensible Download PDF

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Publication number
WO2006024475A1
WO2006024475A1 PCT/EP2005/009281 EP2005009281W WO2006024475A1 WO 2006024475 A1 WO2006024475 A1 WO 2006024475A1 EP 2005009281 W EP2005009281 W EP 2005009281W WO 2006024475 A1 WO2006024475 A1 WO 2006024475A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor device
conductive layer
sensor element
sensor
button
Prior art date
Application number
PCT/EP2005/009281
Other languages
German (de)
English (en)
Inventor
Walter Gänsler
Ewald Bayer
Rolf Streifler
Original Assignee
E.G.O. Control Systems Gmbh
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 E.G.O. Control Systems Gmbh filed Critical E.G.O. Control Systems Gmbh
Publication of WO2006024475A1 publication Critical patent/WO2006024475A1/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
    • H03K17/962—Capacitive touch switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches
    • H03K2217/96076—Constructional details of capacitive touch and proximity switches with spring electrode

Definitions

  • the invention relates to a sensor device for generating a switching signal or triggering signal when approaching and / or touching a finger or the like, and to a method for operating or evaluating such a sensor device.
  • EP 859 467 B describes a sensor device with a capacitive sensor element consisting of conductive foam, which is pressed against the rear side of a panel.
  • the invention is based on the object of providing a sensor device and a corresponding operating or evaluation method which enable a large freedom of movement in the design of the button activated by the approach or contact, the sensor device preferably being cost-effective also in large quantities manufacture and assemble is.
  • the resulting button can have a different shape and / or or size have to be printed as the pressure surface and preferably on. This makes it possible to adapt the buttons to the respective requirements, for example to make them long rectangular or even to form themself in the manner of a pictogram, without having to configure the sensor element located behind the panel accordingly.
  • the shape and size of the button which is advantageously substantially larger than the pressure surface, is decoupled from the shape of the sensor element itself.
  • the button is usable as such up to the very edge.
  • This training thus concentrates the capacitive effect that triggers the switching function on a core that is formed by the sensor element.
  • This can be advantageously cylindrical and form the contact surface with its one end face and with the other end face a contact surface with the electronics.
  • the sensor element can have a transverse hole, by the size of which the pressure force can be determined without the size of the sensor element itself or its material having to be changed.
  • the term "cover” also refers to another operating surface or cover, for example also a front side of an electrical appliance or a cooktop plate of a hob, for example made of glass ceramics. It has also been found that the switching function is not impaired thereby, but even improved, that the diaphragm is interposed between the conductive layer and the sensor element.
  • the switching surface applied as a conductive layer on the front side of the panel can be covered by a cover layer.
  • This cover layer may optically cover the conductive layer and possibly a decor, lettering or the like. contain. It is to be applied as a coating, or preferably by printing.
  • the conductive layer is often printed with a silver-containing ink, it is possible that, especially in household machines, such as washing machines, dishwashers or the like, by cleaning agents or by exposure to light, the conductive layer darkens or otherwise discolored or worn.
  • the cover layer does not affect the effect of the button as a touch switch, but the adverse effects can be eliminated altogether.
  • the cover layer may be formed by a high-straightenable lacquer or a similar layer, wherein it should be as thin as possible.
  • the sensor device has just the aforementioned control.
  • the latter can detect capacitive leakage currents or their changes, which flow via the sensor element to the pressure surface, whereby they are capacitively coupled through the diaphragm into the conductive layer. They flow via direct or almost direct ohmic contact by an applied finger of an operator.
  • the leakage currents between the sensor element and the contact surface can therefore be transmitted capacitively into the conductive layer, while they are transmitted from the conductive layer to the finger essentially by ohmic contact.
  • the controller can provide a medium to high frequency alternating signal as a signal to the sensor element, in particular with a frequency between 10 kHz and 500 kHz, preferably with about 50 kHz to 100 kHz. This improves a capacitive coupling or signal transmission.
  • FIG. 2 is a plan view, seen in the direction of arrow II in Fig. 1,
  • FIG. 3 shows a section corresponding to FIG. 1 through a sensor device with a differently shaped diaphragm
  • Fig. 4 shows a modification of the arrangement of FIG. 1 with differently formed conductive layer and 5 is a plan view of the arrangement of FIG .. 4
  • the sensor device 11 shown in FIGS. 1 and 2 belongs to a capacitive touch switch, which changes the capacitance by approaching a body, such as a finger, to the switching surface or touching it by means of an electronic circuit (not shown) Evaluates switching process.
  • the functional principle and the circuit can be as contained in the publications mentioned at the beginning, to which reference is made here. A slightly modified functional principle will be explained in more detail later.
  • This panel has a front side 13 and a rear side 14, to which a sensor element 15 is pressed.
  • the sensor element is a cylinder made of an electrically conductive elastic material, preferably a foam. He has an upper end face in the drawing, which forms a pressure surface (16), with which the sensor element rests under pressure bias on the back 14 of the diaphragm.
  • the opposite end face 17 of the cylindrical sensor element is fastened by means of a commercially available fixing adhesive 18 for SMD components (Surface Mounted Devices) on a contact surface 19 of a circuit board 20.
  • the contact surface is normally part of a printed circuit and the board is at the same time a carrier of the evaluation electronics for the contact switch and possibly further control elements of the associated device. It is mounted at a distance approximately parallel to the diaphragm.
  • the circuit board 20 with the contact surface 19 is merely a support for the sensor element (s) and the associated circuit is installed separately therefrom.
  • the sensor element has a transverse hole 21, through the size and / or position of which the pressure force exerted on the two end faces 16 and 17 can be adjusted.
  • a conductive layer 22 is auf ⁇ brought forming a button 23 and defined.
  • the application is carried out by printing with an electrically conductive paint or ei ⁇ ner other coating technology. It is not necessary that the surfaces are electrically contacted, but it is sufficient for a conductivity within the layer. Here silver-based colors are best suited.
  • the button 23 is, as can be seen from the figures, much larger than the pressure surface 16 of the sensor element 15 and also has a different shape. It is shown in FIG. 2 that this shape may be formed as a "+", for example, or numbers, letters or pictograms, arrows or the like could also form the basic form, but also rectangles or circles of different sizes make sense Size relationships between the button and the contact surface may be different, in particular in the case of different designs of the switching surface, this may also be smaller than the contact surface for individual or all buttons.
  • the button 23 is preferably applied to the panel in such a way that the associated sensor element 15 is arranged substantially in the center of the area on the other side of the panel. Again, however, a different arrangement is possible. This gives a great creative freedom in the arrangement of the sensor element on the board, eben ⁇ as well as in the design of the front panel.
  • the button 23 is covered by a cover layer 24, e.g. may consist of a resistant lacquer, preferably an opaque lacquer, which covers the underlying conductive layer 22 and may preferably be colored and / or decorated or decorated.
  • the cover layer 24 covers the button 23 at the edges with only a slight protrusion 25, so as to represent the button 23 in both shape and size.
  • FIG. 3 shows that an even better and also tactile limitation of the button is given if the diaphragm forms a demarcated region which is plastically formed or applied in the diaphragm, such as, for example, an elevation 26.
  • a demarcated region which is plastically formed or applied in the diaphragm, such as, for example, an elevation 26.
  • a corresponding depression would be present.
  • the limitation of the button 23 becomes particularly obvious as its boundaries are both visible and palpable. Together with a Pikto ⁇ gram design is thus the sensor device also blind.
  • the top layer should meet the wear resistance of its surface to the requirements that are placed on the appropriate equipment, as there are water vapor, heat or climatic resistance, smudge resistance, resistance to commercial cleaning agents, abrasion resistance, tear-off with tape, gloss, light and UV resistance etc ..
  • Significant advantages are achieved by the invention compared to previous sensor devices: So far, the buttons on the back of the panel were occupied by contact surfaces, which corresponded in shape and size of the button. This required the most varied designs of the sensor elements, which thus had to be manufactured, stored, sorted or prepared differently and usually had to be assembled manually. The pressure and contact surfaces and the entire sensor elements were usually very large and took up a lot of space on the associated boards.
  • buttons are usually provided with numerous buttons, these can now be used in their specific form, e.g. applied by printing on the front and provided with the cover layer.
  • the board can already be equipped with a corresponding placement machine when the electronic circuit is equipped, wherein only a single type of sensor element has to be provided. However, it is also possible to insert the sensor elements later. Thereafter, the board is mounted by appropriate spacers with distance to the back of the panel and the Bermmungs ⁇ switch is functional.
  • a sensor device 111 is shown in a modification of the arrangement of FIG. 1 with a curved aperture 112, which in turn may consist of the aforementioned material. At its rear side 114 it has an integrally formed receptacle 129.
  • the sensor element 115 which in turn is a cylinder made of electrically conductive elastic material such as electrically conductive foam, are used.
  • it is held therein with a certain clamping effect. This is particularly advantageous for the assembly until the board 120 is applied with the contact surface 119 to the sensor element 115 for the final fixation of the same.
  • the conductive adhesive 18 according to FIG. 1 can also be dispensed with.
  • this diaphragm 112 has an increase 126.
  • a conductive layer 122 which in turn may be an aforementioned color, covers precisely and precisely this elevation 126.
  • the conductive layer 122 is substantially smaller than the pressure surface 116.
  • a cover layer 124 is shown on the conductive layer 122.
  • the said conductive layers or colors are often not wear-resistant enough.
  • the cover layer 124 may be a wear-resistant paint or coating, in particular a clearcoat.
  • the cover layer 124 should be relatively thin while ensuring wear resistance, which will be explained in more detail below.
  • control 132 is arranged on the circuit board 120, which controls or evaluates the sensor device 111, as well as, for example, other sensors. Sorium 115.
  • control 132 tion on another than the board 120 is arranged. In this case, it is to be electrically connected to this or contact surface 119 or the sensor element 115.
  • the conductive layer 122 which corresponds to the innermost rectangle shown by dashed lines, is long and narrow.
  • the cover layer 124 overlaps it a little.
  • the course of the conductive layer 122 defines the formation of the elevation 126.
  • the sensor element 115 which is considerably larger than the conductive layer 122 here by its dimensions or also by the contact surface 116, is also shown in phantom below the diaphragm 112. This will also make it clearer, which will be discussed in greater detail below There are certainly possibilities for variation for the size ratio between conductive layer 122 and contact surface 116 or sensor element 115.
  • Drive signals from the controller 132 are applied to the sensor element 115 via the contact surface 119. This, in turn, transmits these signals capacitively to this layer via the capacitive coupling of the sensor element between the contact surface 116 and the conductive layer 122. Since the drive signal, as mentioned above, is harnessfre ⁇ quent, this signal coupling is relatively good or relatively strong. The application of a finger 130 to the conductive layer 122 directly without the overlying cladding layer 124 undoubtedly produces direct ohmic contact between the two. Thus, in this case, the capacitive leakage current of the drive or of the drive signals can flow away from the conductive layer 122 via the finger 130.
  • the advantage of the invention lies in the fact that in otherwise known similar Bermmschalteran extracten the Sensorele ⁇ ment or its pressure surface opposite surface, which is formed by the applied finger on the panel, may vary. Above all, it varies depending on the size of the finger and the pressing pressure. This in turn means that the capacitive coupling between the sensor element and the finger, which depends on the respectively involved and opposite surfaces, is different in size. This makes evaluation of a touch more difficult, in particular visibly distinguishing unwanted touches or other disturbances.
  • the opposing surfaces, which cause the capacitive coupling, by the pressure surface 16 and 116 of the sensor element 15 or 115 and the conductive layer 22 and 122 are precisely defined. None changes to them, not even in the case of actuation or contact. So here is the capacitive coupling always the same. Since the contact between finger 130 and conductive layer 22 is either completely or substantially ohmic, which in particular does not depend on the size of the contact surface, conditions are always defined when a finger is created. This is, as I said, especially advantageous for a reliable evaluation.

Abstract

Selon l'invention, une touche sensible d'un commutateur à effleurement est pourvue d'une surface de commande (23) au niveau de la face avant d'un panneau (12) d'un appareil ménager ou similaire. Cette surface de commande comprend une couche électriquement conductrice (22) sur laquelle est appliquée une couche de recouvrement (24) comportant éventuellement un décor. Un élément sensible (15) constitué d'une mousse conductrice est disposé sur la face arrière (14) du panneau (12), la surface de pression (16) de cet élément sensible sur le panneau présentant une forme différente de celle de la surface de commande (23). L'élément sensible s'étend entre le panneau et une platine (20) sur laquelle se trouve une surface de contact (19) qui fait partie du circuit d'évaluation électronique pour le dispositif sensible.
PCT/EP2005/009281 2004-09-01 2005-08-29 Dispositif sensible et procede pour faire fonctionner un tel dispositif sensible WO2006024475A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004043415.8 2004-09-01
DE200410043415 DE102004043415A1 (de) 2004-09-01 2004-09-01 Sensorvorrichtung

Publications (1)

Publication Number Publication Date
WO2006024475A1 true WO2006024475A1 (fr) 2006-03-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/009281 WO2006024475A1 (fr) 2004-09-01 2005-08-29 Dispositif sensible et procede pour faire fonctionner un tel dispositif sensible

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WO (1) WO2006024475A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102265517A (zh) * 2009-02-06 2011-11-30 普瑞有限公司 电容接触式传感器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006005677B4 (de) * 2006-01-30 2015-12-31 E.G.O. Elektro-Gerätebau GmbH Kochfeld
KR101225973B1 (ko) * 2006-06-09 2013-01-24 엘지전자 주식회사 전기전자기기의 정전 용량형 스위치
DE202007000969U1 (de) * 2007-01-16 2007-03-15 E.G.O. Elektro-Gerätebau GmbH Sensorelement für einen kapazitiven Berührungsschalter sowie Bedienungseinrichtung
DE102007008178A1 (de) 2007-02-12 2008-08-14 E.G.O. Elektro-Gerätebau GmbH Sensorelement für einen Berührungsschalter, Herstellungsverfahren und Berührungsschaltereinrichtung mit solchen Sensorelementen
DE102017106529A1 (de) 2017-03-27 2018-09-27 Preh Gmbh Bedieneinrichtung mit einer verbesserten kapazitiven Näherungssensorik

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE1299749B (de) * 1963-09-11 1969-07-24 Siemens Ag Durch Fingerberuehrung betaetigbares Steuerelement zur Steuerung von Anzeige und/oder Auswerteeinrichtungen in Wechselstromkreisen
EP0054306A1 (fr) * 1980-12-17 1982-06-23 Bosch-Siemens HausgerÀ¤te GmbH Commutateur capacitif à effleurement pour appareils ménagers électriques
EP0859468A1 (fr) * 1997-02-17 1998-08-19 E.G.O. ELEKTRO-GERÄTEBAU GmbH Circuit pour un élément capteur

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CA1157925A (fr) * 1979-09-28 1983-11-29 Robert Posset Panneaux de commutation a touches a effleurement capacitives et methodes de fabrication
CA1152603A (fr) * 1979-09-28 1983-08-23 Bfg Glassgroup Dispositifs capacitifs de commutation par effleurement
FR2469287A1 (fr) * 1979-11-14 1981-05-22 Dietrich & Cie De Touche a effleurement et tableau de commande en comportant application
DE3119495A1 (de) * 1980-05-27 1982-02-25 Playmont AG, St. Gallen "annaeherungs-schalter"
US5572205A (en) * 1993-03-29 1996-11-05 Donnelly Technology, Inc. Touch control system
DE19706167A1 (de) * 1997-02-17 1998-08-20 Ego Elektro Geraetebau Gmbh Schaltungsanordnung für ein Sensorelement
ES2174342T3 (es) * 1997-02-17 2002-11-01 Ego Elektro Geraetebau Gmbh Interruptor por tacto con tecla sensorial.
DE20119700U1 (de) * 2001-11-29 2002-02-14 E G O Control Systems Gmbh & C Sensorvorrichtung
DE10250395A1 (de) * 2002-10-29 2004-05-13 BSH Bosch und Siemens Hausgeräte GmbH Kapazitiver Annäherungs- und/oder Berührungssensor sowie elektrisch leitfähiger Kunststoffkörper für einen solchen Sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299749B (de) * 1963-09-11 1969-07-24 Siemens Ag Durch Fingerberuehrung betaetigbares Steuerelement zur Steuerung von Anzeige und/oder Auswerteeinrichtungen in Wechselstromkreisen
EP0054306A1 (fr) * 1980-12-17 1982-06-23 Bosch-Siemens HausgerÀ¤te GmbH Commutateur capacitif à effleurement pour appareils ménagers électriques
EP0859468A1 (fr) * 1997-02-17 1998-08-19 E.G.O. ELEKTRO-GERÄTEBAU GmbH Circuit pour un élément capteur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102265517A (zh) * 2009-02-06 2011-11-30 普瑞有限公司 电容接触式传感器

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