EP3369179A1 - Commutateur tactile capacitif - Google Patents

Commutateur tactile capacitif

Info

Publication number
EP3369179A1
EP3369179A1 EP15832730.4A EP15832730A EP3369179A1 EP 3369179 A1 EP3369179 A1 EP 3369179A1 EP 15832730 A EP15832730 A EP 15832730A EP 3369179 A1 EP3369179 A1 EP 3369179A1
Authority
EP
European Patent Office
Prior art keywords
sensor
plate
capacitive touch
touch switch
layer
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP15832730.4A
Other languages
German (de)
English (en)
Inventor
Pawel MASINA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diehl AKO Stiftung and Co KG
Original Assignee
Diehl AKO Stiftung and Co KG
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 Diehl AKO Stiftung and Co KG filed Critical Diehl AKO Stiftung and Co KG
Publication of EP3369179A1 publication Critical patent/EP3369179A1/fr
Withdrawn legal-status Critical Current

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
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • 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
    • 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
    • H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/086—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination touch control
    • 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
    • H03K2017/9602—Touch switches characterised by the type or shape of the sensing electrodes
    • 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
    • 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
    • H03K2217/960785—Capacitive touch switches with illumination

Definitions

  • the present invention relates to a capacitive touch switch, in particular a capacitive touch switch for an operating device of an electronic household appliance.
  • touch-sensitive and / or proximity-sensitive push-buttons ie touch switches in the sense of the present invention
  • a capacitive sensing element together with, for example, a user's finger, forms a capacitance therebetween having a variable capacitance value corresponding to touching or not touching a touch pad of the cover associated with the capacitive sensing element.
  • the change in the capacitance value has a corresponding effect on an output signal of the sensor circuit connected to the capacitive sensor element, which may optionally be interpreted by an evaluation electronics as an actuation of the touch switch.
  • a capacitive touch switch is known in which the capacitive sensor element rests against the underside of the cover facing away from the user and partially for displaying a symbol is translucent designed so that it can be backlit by a light source on a support plate.
  • DE 103 26 684 A1 discloses a capacitive touch switch with a capacitive sensor element, which is clamped between the cover and a light guide element and consists of a transparent support film with an ITO coating. If required, symbols can be created by additional printing or masks on the light guide or the sensor element.
  • EP 1 894 712 B1 describes a capacitive touch switch which has a multilayer film behind a glass cover, wherein the film has a first carrier layer printed with a conductive layer and a second carrier layer printed with a color layer.
  • the carrier layers are connected to each other and to the cover via adhesive layers.
  • light-permeable pictograms can be formed in the conductive layer on the first carrier layer.
  • the invention has for its object to provide an improved capacitive touch switch with a simple structure that is resistant to heat and allows backlit symbols.
  • the capacitive touch switch of the invention comprises an at least partially translucent cover plate having a user facing user side; a support plate which is disposed on a side facing away from the user side of the cover plate at a distance therefrom; and a light source mounted on the support plate.
  • the capacitive touch switch further comprises a sensor plate which is located between the cover plate and the carrier plate is disposed and having an at least partially transparent substrate and a sensor layer made of an electrically conductive material, wherein the sensor layer comprises a sensor region of the electrically conductive material for forming a sensor electrode and a symbol region without the electrically conductive material for forming a through the Has light source backlit symbol.
  • a multifunctional sensor plate which on the one hand provides the capacitive sensor element and at the same time the backlightable symbol in only one component.
  • the substrate of the sensor plate is preferably a printed circuit board (PCB, Printed Circuit Board) with a layer thickness of at most 1, 2 mm used.
  • PCB printed circuit Board
  • standard printed circuit boards with a layer thickness of 1, 0 mm or 0.6 mm can be used.
  • these printed circuit boards are dimensionally stable and heat-resistant and, on the other hand, are translucent due to the small layer thickness.
  • LEDs light-emitting diodes
  • a printed circuit board (PCB) is preferably used.
  • PCB printed circuit board
  • standard printed circuit boards with a layer thickness of 1, 5 mm can be used.
  • the evaluation electronics for processing and evaluating the output signals generated by the sensor circuit are preferably also provided on the carrier plate. To be distinguished from this evaluation is the control of eg the household appliance, with which the Transmitter is connected and which optionally can also be arranged on the support plate or elsewhere in the household appliance.
  • the cover plate is preferably a plate-shaped body made of an at least partially translucent material (eg glass, glass ceramic, plastic, etc.).
  • the cover plate is preferably made of an electrically non-conductive or insulating material.
  • the symbol area is preferably formed within the sensor area of the sensor layer.
  • the sensor region of the sensor layer is preferably surrounded by an intermediate region without the electrically conductive material.
  • the sensor layer is a layer of the electrically conductive material (for example copper) deposited on the substrate, in which the symbol region and / or the intermediate region are formed by etching.
  • the entire sensor plate can be manufactured with conventional manufacturing or processing techniques of printed circuit boards.
  • the sensor plate can optionally contain one or two sensor layers.
  • the sensor plate may preferably have a first sensor layer on a side of the substrate facing the cover plate and / or a second sensor layer on a side of the substrate facing the carrier plate.
  • a diffusion layer is further provided on a side of the sensor plate facing the cover plate and / or on a side of the sensor plate facing the carrier plate.
  • This diffusion layer is preferably applied by means of screen printing (silk screen).
  • the diffusion layer is preferably applied to a side of the sensor layer (s) of the sensor plate facing away from the substrate.
  • the diffusion layer should bring about a more uniform illumination of the symbol formed by the symbol area.
  • the diffusion layer preferably forms part of the sensor plate.
  • the diffusion layer is designed such that it prevents optical crosstalk.
  • the diffusion layer formed as a crosstalk prevention layer shields the cover plate from the light source in optically inactive regions.
  • the sensor plate is connected to the cover plate via an at least partially transparent adhesive layer.
  • the sensor plate can also rest directly on the cover plate.
  • the sensor plate can also be connected to the carrier plate via an adhesive layer or lie directly against the carrier plate.
  • a frame member having an opaque separation region surrounding the light source on the support plate circumferentially.
  • the frame element preferably forms part of the carrier plate.
  • the subject of the invention is also an arrangement of several (ie at least two) capacitive touch switches of the invention described above.
  • the plurality of touch switches of the assembly then preferably utilize a common cover plate, a common support plate, and a common sensor plate.
  • the invention further relates to an operating device, in particular for an electronic household appliance, with at least one capacitive touch switch of the invention described above.
  • Fig. 1 is a sectional view of an arrangement of capacitive touch switches according to the invention in exploded view;
  • Fig. 2 is a sectional view of a sensor plate of the arrangement of touch switches of Fig. 1 according to an embodiment of the invention.
  • FIGs. 1 and 2 an embodiment of an arrangement of a plurality of capacitive touch switches (ie touch-sensitive and / or proximity-sensitive push-buttons) will be described in more detail below, which are advantageously used in an operating device of a home electronic appliance such as a cooktop or cooker can.
  • capacitive touch switches ie touch-sensitive and / or proximity-sensitive push-buttons
  • FIG. 1 illustratively includes three capacitive touch switches sharing some of the components.
  • touch switches For the purpose of simpler formulation, the construction of one of these touch switches will first be described below, it being clear to the person skilled in the art that all touch switches are constructed analogously to one another.
  • the touch switch includes a cover plate 0, for example made of glass, which is at least partially translucent.
  • a cover plate 10 On the user side 12 facing the user 14 (at the top in FIG. 1) the cover plate 10 defines a contact field at the touch or approach by the user of the touch switch is actuated.
  • the carrier plate 16 is, for example, a printed circuit board (PCB) with a layer thickness of about 1.5 mm.
  • PCB printed circuit board
  • the touch switch also includes a light source 34 which is mounted on the support plate 16.
  • the light source 34 is, for example, one or more light-emitting diodes (LEDs).
  • a frame member 18 is also provided on the cover plate 10 facing side of the support plate 16.
  • This frame member 18 includes an opaque separation region 36 which circumferentially surrounds the light source 34.
  • the frame member 18 thus shields the light source 34 from the environment and light sources of adjacent touch switch.
  • Support plate 16 and frame member 18 preferably form an integral component.
  • a sensor plate 20 is also arranged between the cover plate 10 and the support plate 16.
  • This sensor plate 20 may abut directly on the cover plate 10 or be connected thereto via an at least partially transparent adhesive layer.
  • the sensor plate 20 may abut directly on the support plate 16 or be connected thereto via an adhesive layer.
  • the structure of the sensor plate is shown in Fig. 2 in more detail.
  • the sensor plate 20 has, in particular, a substrate 22.
  • the substrate preferably consists of a printed circuit board (PCB) having a layer thickness of, for example, 0.6 mm or 1.2 mm. Because of this small layer thickness is Substrate dimensionally stable and heat-resistant (for temperatures of 100 ° C, 120 ° C and more), but still at least partially translucent.
  • PCB printed circuit board
  • the sensor plate 20 On the cover plate 10 facing side of the substrate 22 (top in Fig. 2), the sensor plate 20 has a sensor layer 24a made of an electrically conductive material such as copper.
  • the copper layer can be deposited on the substrate 22 in a standard process.
  • sensor regions 28 of copper are formed in this sensor layer 24a, which regions are surrounded by intermediate regions 30 without copper. These sensor regions 28 form the capacitive sensor elements of the capacitive touch switches, which form a capacitance with the finger 14 of a user via the cover plate 10 which acts as a dielectric.
  • the sensor regions 28 of the sensor plate 20 are connected via an electrically conductive connection 38 to the sensor circuits and the evaluation electronics on the carrier plate 16 (see FIG. 1).
  • symbol regions 32 without copper are also formed in the sensor regions 28 made of copper. These symbol areas 32 represent pictograms, symbols, numbers, letters, etc., which are translucent and can thus be backlit with the aid of the light source 34.
  • One or more symbol regions 32 may be formed in a sensor region 28.
  • the sensor plate 20 thus forms, as one component, both the capacitive sensor elements in the form of the sensor regions 28 made of copper and the backlit information or decoration elements in the form of the symbol regions 32.
  • the substrate 22 of the sensor plate 20 must be at least partially translucent, which can be achieved by a correspondingly small layer thickness of the circuit board.
  • the sensor plate 20 is also sufficiently dimensionally stable and heat-resistant, so that the capacitive touch switch can also be used in harsher environments.
  • a diffusion layer 26a is optionally provided on the side of the sensor layer 24a facing the cover plate 10.
  • This diffusion layer 26a is formed, for example, in the form of a silk screen and is intended to bring about a more uniformly illuminated appearance of the symbol of the symbol region 32.
  • the sensor plate 20 can optionally have a further sensor layer 24b on the side of the substrate 22 facing the carrier plate 16 (bottom in FIG. 2) and / or a further diffusion layer 26b on the side of the sensor plate 20 facing the carrier plate 16 exhibit.
  • This further sensor layer 24a and this further diffusion layer 26b may be provided additionally or alternatively to the sensor layer 24a or to the diffusion layer 26a.
  • the diffusion layer 26a, 26b is formed as a crosstalk prevention layer, this prevents optical crosstalk.
  • the crosstalk prevention layer shields the cover plate 10 from the light source in an optically inactive region and prevents the cover plate 10 from being transmitted through. If the crosstalk prevention layer is interrupted, it is possible to irradiate the cover plate 10 in the region of this interruption; this area is optically active , for example in the symbol area 32.
  • the entire sensor plate 20 is preferably provided as an integral component.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

L'invention concerne un commutateur tactile capacitif, destiné à un dispositif de commande d'un appareil ménager électronique, comprenant une plaque de recouvrement au moins partiellement transparente pourvue d'un côté utilisateur tourné vers un utilisateur, une plaque de support disposée du côté de la plaque de recouvrement opposé au côté utilisateur à une certaine distance de celle-ci et une source de lumière (34) montée sur la plaque de support (16). Le commutateur tactile comprend en outre une plaque de détection (20) qui est disposée entre la plaque de recouvrement (10) et la plaque de support (16) et qui comporte un substrat (22) au moins partiellement transparent et une couche de détection (24a, 24b) en matière électriquement conductrice. Selon l'invention, la couche de détection (24a, 24b) comporte une région de détection (28) en matière électriquement conductrice, destinée à former une électrode de détection, et une région de symbole (32) sans matière électriquement conductrice destinée à former un symbole rétro-éclairé par la source lumineuse (34).
EP15832730.4A 2015-10-30 2015-10-30 Commutateur tactile capacitif Withdrawn EP3369179A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/002184 WO2017071725A1 (fr) 2015-10-30 2015-10-30 Commutateur tactile capacitif

Publications (1)

Publication Number Publication Date
EP3369179A1 true EP3369179A1 (fr) 2018-09-05

Family

ID=55310778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15832730.4A Withdrawn EP3369179A1 (fr) 2015-10-30 2015-10-30 Commutateur tactile capacitif

Country Status (3)

Country Link
US (1) US20180248547A1 (fr)
EP (1) EP3369179A1 (fr)
WO (1) WO2017071725A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2020006089A (es) * 2017-12-11 2021-01-08 Canadian General Tower Ltd Pelicula polimerica transmisora ligera, interactiva con el usuario.
DE102019212466A1 (de) * 2019-08-21 2021-02-25 BSH Hausgeräte GmbH LED-Kettenelektronik für ein Haushaltsgerät, Haushaltsgerät und Verfahren
EP3805646B1 (fr) * 2019-10-07 2023-09-06 BSH Hausgeräte GmbH Dispositif de table de cuisson

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123633A1 (de) 2001-05-09 2003-02-06 Ego Elektro Geraetebau Gmbh Sensorelement
DE10326684A1 (de) 2003-06-03 2004-12-23 Ego Control Systems Gmbh + Co. Kg Sensorvorrichtung
JP2006260971A (ja) * 2005-03-17 2006-09-28 Alps Electric Co Ltd 入力装置
SI22353A (sl) 2006-08-28 2008-02-29 Gorenje Gospodinjski Aparati, D.D. Na dotik obcutljiva folija in iz nje zasnovano stikalo
KR101356648B1 (ko) * 2007-03-12 2014-02-03 삼성전자주식회사 컨트롤패널 및 이를 갖춘 세탁기
US9128666B2 (en) * 2011-05-04 2015-09-08 Apple Inc. Housing for portable electronic device with reduced border region
JP2013077555A (ja) * 2011-09-12 2013-04-25 Futaba Corp タッチスイッチ
JP5127980B1 (ja) * 2011-12-26 2013-01-23 株式会社東芝 電子機器
KR101993004B1 (ko) * 2014-11-07 2019-06-26 엘지전자 주식회사 냉장고

Also Published As

Publication number Publication date
US20180248547A1 (en) 2018-08-30
WO2017071725A1 (fr) 2017-05-04

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