EP1596405B1 - Procédé de fabrication d'une feuille piezo-électrique et luminescente, et élément d'actionnement avec une telle feuille - Google Patents

Procédé de fabrication d'une feuille piezo-électrique et luminescente, et élément d'actionnement avec une telle feuille Download PDF

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Publication number
EP1596405B1
EP1596405B1 EP05010006A EP05010006A EP1596405B1 EP 1596405 B1 EP1596405 B1 EP 1596405B1 EP 05010006 A EP05010006 A EP 05010006A EP 05010006 A EP05010006 A EP 05010006A EP 1596405 B1 EP1596405 B1 EP 1596405B1
Authority
EP
European Patent Office
Prior art keywords
luminescent
piezoelectric
lacquer
part region
piezo
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.)
Expired - Lifetime
Application number
EP05010006A
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German (de)
English (en)
Other versions
EP1596405A1 (fr
Inventor
Karsten Dr. Rüter
Michael Steckel
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.)
Lisa Draexlmaier GmbH
Original Assignee
Lisa Draexlmaier 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 Lisa Draexlmaier GmbH filed Critical Lisa Draexlmaier GmbH
Publication of EP1596405A1 publication Critical patent/EP1596405A1/fr
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Publication of EP1596405B1 publication Critical patent/EP1596405B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/02—Piezo element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/052—Phosphorescence

Definitions

  • the present invention relates to a method for producing a combined piezo / luminescent film for use as an actuating element, in particular in vehicles, and to a corresponding actuating element.
  • a combined piezo / luminescent film is to be understood as meaning an element in which the properties of a conventional piezo film or of a piezoelectric switch element are combined with those of a conventional electroluminescent film or luminescent film.
  • Actuators are to be understood in particular as function carriers or switching elements which initiate switching operations or are used for command input and which have hitherto been actuated in the prior art via mechanical-electrical control buttons.
  • actuating functions or switching on and off commands for various components can be selected, activated or deactivated via actuating elements.
  • actuating elements For example, it is customary to set, lift, lower or open and close the windows, the sunroof, the exterior mirrors or the like by means of electrically actuated servomotors.
  • a plurality of function keys are provided in motor vehicles, via the electrical consumers, such as heaters, ventilation, lighting elements, radio, On-board computer, navigation system and the like can be operated.
  • the actuators for such function carriers in motor vehicles are usually mounted in the center console, in the instrument panel and / or in or on the steering wheel.
  • the design of the various actuators is not only from the point of view of an advantageous mode of operation, but must also have an advantageous look and feel beyond. For this purpose, it is customary in particular in the area of the instrument panel and the steering wheel that the actuating elements are arranged within a decorative layer.
  • the actuators activate conventionally by closing an electrical contact, a control device that controls the movement of the individual actuators for the function carrier.
  • the actuators are usually arranged in the form of snaps within the decorative layer, so that they protrude from the surface palpably raised.
  • this tactile arrangement of the actuating elements leads to the fact that the decorative layer must be configured interrupted in the area of the actuating elements.
  • joints are produced in which impurities accumulate over time, which can impair both the functioning of the actuating element and the appearance of the entire decorative layer.
  • the above-mentioned problems can be overcome by the use of piezoelectric actuators instead of the conventional actuators.
  • the decorative layer can be made substantially closed, wherein below the optical element on the decorative layer illustrated a piezoelectric Element is arranged.
  • This piezoelectric element is advantageously a piezoelectric film.
  • Piezo switches for example, ceramic hobs, coffee machines or so-called "vandal-proof" keyboards are for example from DE 96 304 443 T2 known.
  • the manufacturing method of a piezoelectric film or piezo film is further disclosed, so that the production of a piezo film per se can be regarded as known in the art. Consequently, a detailed description of the production of a piezo film will be omitted hereafter. It should be noted, however, that in the production of a piezo film usually by means of a screen printing process, a piezoelectric paint and insulating layers are applied to a substrate.
  • switches or actuators of any kind must be illuminated in the vehicle, so that they can be easily found even in the dark. A distinction is made between search and functional lighting.
  • the function lighting is used to display an activity and must also be recognizable during the day. This is usually achieved via LEDs or light bulbs.
  • the search light is used to determine the position of individual switches during the night. This can be done in a motor vehicle in various ways such. Example, by an indirect illumination of the entire button, a backlight of a single switch (by light bulbs) or the entire button (eg., By a luminous film) or by lying low-luminance LEDs. However, the use of light bulbs is eliminated for the piezo technology. Furthermore, investigations by the Applicant have found it advantageous to use a luminescent film in conjunction with piezo switches or piezo actuators. The production of a luminous film is the expert in Generally known, wherein usually a luminous material is applied by screen printing together with electrodes on a carrier material.
  • this combined piezo / luminescent film is produced in such a way that piezo films and luminescent films are produced independently of one another.
  • a piezo film according to the disclosure of DE 69 304 43 T2 or US-A-4516112 made and a luminous film, such as those in the DE 102 55 199 A1 is described.
  • the two piezo foils and luminescent foils produced independently of one another are connected to one another as individual elements, preferably by gluing, so as to produce a laminate.
  • the technical problem underlying the present invention is to provide a method for producing a combined piezo / luminescent film for use as an actuator, which is substantially improved and simplified compared to the above-mentioned method, so that a corresponding actuator with a Such piezo / luminescent film can be produced at lower production costs, with improved functional properties and a lower weight.
  • the present invention is based on the idea of replacing the two production processes of the piezo foils and luminescent foils produced independently of one another by a combined production process.
  • a combined manufacturing process lower manufacturing costs can be achieved and also results in a combined piezo / luminescent film, which is improved in terms of their weight and their functional properties.
  • the present invention proposes a method for producing a combined piezo / luminescent film for use as an actuating element, in particular in vehicles.
  • the method first comprises the provision of a film-like carrier material.
  • the support material may be a self-supporting film of an organic polymer composition consisting essentially of an electrically insulating thermoplastic or thermosetting polymer.
  • Representative examples include films of commercially available polyesters, polycarbonates, polypropylenes, polyamides, polyacetals, etc. having conventional strengths in the range of about 50 to 2000 microns .
  • a piezoelectric coating is applied to this carrier material at least in a first subregion.
  • Piezoelectric paints for application to a carrier are known to the person skilled in the art, so that in this regard no further embodiments are required.
  • the piezoelectric lacquer in the first partial region forms a piezoelectric button or a piezo switch.
  • the application of the piezoelectric paint and the contact connections to the piezo switch can be applied to the substrate.
  • a luminescent varnish or a luminescent function layer or electroluminescent layer is applied to the substrate, wherein this takes place at least in a second subregion.
  • the properties of the luminescent varnish are also known from the production of separate luminescent foils, so that in this regard, too, no further explanations are required.
  • the luminescent varnish after curing, forms a luminescent layer that illuminates the button in the second subregion when it is excited by electrodes.
  • the electrodes can be applied simultaneously or separately to the carrier material and can be provided, for example, by sputtering.
  • a cover layer is provided for protection over at least the first and second subregions in order to cover the piezoelectric varnish and the vitrifying varnish.
  • the cover layer is then bonded to the substrate either directly or through other materials.
  • the piezoelectric coating and / or the luminescent varnish are applied to the substrate by means of a screen printing process.
  • the screen printing process provides a simple and inexpensive process.
  • each Any configuration and design of the button and the illumination area can be achieved.
  • the manufacturing process can be done in a single machine. So z. B. the piezoelectric paint and the luminous paint are applied simultaneously or separately.
  • the first and second partial region can be arranged next to one another or, however, advantageously overlap at least partially. If the first and the second subregions overlap, then the luminescent varnish is applied after the application of the piezoelectric varnish, so that the luminescent layer is arranged on a side of the combined piezoluminescent film facing the decorative side. This is necessary so that the piezoelectric element does not cover the luminous film and thus prevents visibility of the illumination from a decorative side.
  • the luminescent varnish and the piezoelectric varnish are applied separately, it is preferable to apply an electrically insulating layer between the application of the piezoelectric varnish and the luminescent varnish. This process can also be carried out in a printing process.
  • the piezoelectric paint and the luminous paint are applied directly to the substrate.
  • the piezoelectric element is preferably a so-called sandwich element in which the step of applying a piezoelectric lacquer to the carrier material in the first partial region is repeated at least once, in each case with the interposition of an insulating layer in the first partial region first subregion, a composite of superimposed layers of piezoelectric paint and insulating material is formed.
  • a layer of piezoelectric paint in the connection a layer of insulating material and then in turn applied a piezoelectric lacquer layer.
  • the luminous element is also a so-called sandwich element.
  • a conductive layer is applied in the second partial region, likewise after the luminescent varnish is applied, so that a composite of luminescent varnish and conductive material is formed in the second partial region.
  • the cover layer is transparent at least in the second partial area or a part thereof.
  • the present invention also proposes an actuating element, in particular for vehicles and in particular for motor vehicles, which has a combined piezo / luminescent film produced by the method of the preceding claims and a decorative surface arranged opposite the carrier material on the side of the cover layer.
  • This embodiment achieves an actuating element which enables improved functional properties with a lower weight and lower manufacturing costs.
  • a combined piezo / luminescent film can be used in an actuating element which has only one cable outlet.
  • the striking of contact parts is simplified and the manufacturing cost of the actuating element further reduced.
  • the piezo / luminescent film used in the actuating element comprises at least two buttons, so that the actuating element can combine a plurality of switching functions in one element.
  • a combined piezo / luminescent film produced by the method according to the invention according to a first embodiment comprises a carrier 1, on the carrier 1 and the piezoelectric layer 2 and the luminescent layer 3 covering a cover layer 4 is arranged, which is connected by means of adhesive 5 to the carrier 1 ,
  • This inventive piezo / luminescent film is produced by the following inventive method according to a first exemplary embodiment.
  • a sheet-like substrate is provided as the substrate 1.
  • a piezoelectric coating 2 is applied in a subarea A1 and A2 by screen printing.
  • a luminescent varnish is likewise applied by screen printing in a second subregion B1 and B2.
  • both the piezoelectric coating 2, and the luminous paint 3 are applied directly to the substrate 1. This process can be done simultaneously or separately.
  • the conductive portions (not shown) associated with the piezoelectric paint which electrically contact the piezoelectric element and the electrodes (not shown) of the resist are also applied. This can also be done in a printing process.
  • the configuration or the shape of the luminescent varnish or luminous element 3 and of the piezoelectric varnish or piezoelectric element 2 can take place in any desired form due to the printing process.
  • the piezoelectric element 2 in the partial area A1 can assume a substantially round, circular shape and the luminous element 3 provided in the partial area B1 surround this circular piezoelectric element in an annular manner.
  • the piezoelectric element 2 and the luminous element 3 in the subregions A2 and B2 may also simply be arranged next to one another.
  • a cover layer 4 is provided on the support 1, covering at least the partial areas A1, A2 and B1, B2.
  • the covering layer 4 covers the entire carrier 1 and is connected to the carrier 1 via an adhesive layer 5.
  • the cover layer is translucent at least in the regions B1 and B2, so that the illumination is visible from the side of the cover layer 4.
  • FIG. 2 shows a piezoelectric / luminous film produced by an alternative method according to a second embodiment of the present invention.
  • the illustrated piezo / luminescent film substantially corresponds to the piezo / luminescent film shown in FIG.
  • the essential difference lies in the fact that an electrically insulating layer 6 is provided between the piezoelectric coating 2 and the luminescent varnish 3.
  • a carrier 1 in the form of a foil-like material is provided.
  • the piezoelectric coating 2 is then applied directly to the substrate A1 and A2 on this substrate 1.
  • an electrically insulating layer 6 is applied.
  • the electrically insulating layer 6 is applied over the entire carrier 1. This can be done via bonding by means of an adhesive 5.
  • an insulating varnish which is applied in a printing process similar to the piezo varnish 2 and the light varnish 3, can also be used.
  • the luminescent varnish 3 is applied to the support 1, wherein the luminescent varnish does not come into direct contact with the support 1, but rather with the electrically insulating layer 6, which in turn is in contact with the support.
  • the first subarea A1 of the piezoelectric varnish 2 and the second subarea B1 of the luminous varnish 3 may overlap in regions.
  • the first portion A1 and the second portion B1 even completely overlap.
  • the first partial area A2 and the second partial area B2 can also be arranged next to one another, so that they do not overlap one another.
  • a cover layer 4 is applied, which in this case is connected to the carrier via the electrically insulating layer 6.
  • the cover layer 4 is advantageously bonded to the insulating layer 6 using an adhesive.
  • the cover layer 4 in the second partial area B1 and the second partial area B2 is translucent.
  • the luminosity of the luminescent layer 3 is visible from the side of the cover layer 4 when the luminescent layer is excited via the electrodes (not shown).
  • composition of a piezoelectric lacquer or a light-emitting lacquer, as well as their electronic wiring or connection are known to those skilled in the separate production of the corresponding elements. Consequently, there is no further explanation regarding the composition of the piezoelectric varnish and the varnish, as well as their electrical connection.
  • a decorative surface is arranged on the side of the cover layer 4.
  • the decorative surface may be a separate element, wherein the combined piezo / luminescent film is connected thereto, or the cover layer 4 may be formed such that it forms the decorative surface.

Landscapes

  • Illuminated Signs And Luminous Advertising (AREA)
  • Electroluminescent Light Sources (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
  • Manufacture Of Switches (AREA)

Claims (11)

  1. Procédé de fabrication d'une feuille piézoélectrique/luminescente combinée, pour utilisation comme élément d'actionnement, en particulier dans des véhicules, comprenant les étapes suivantes :
    - fourniture d'un matériau support (1) du type d'une feuille ;
    - application d'un vernis (2) piézoélectrique sur le matériau support, en au moins une première zone partielle (A1, A2), pour réaliser une surface de commutation piézoélectrique dans la première zone partielle ;
    - application d'un vernis luminescent (3) sur le matériau support, en au moins une deuxième zone partielle (B1, B2) pour pouvoir illuminer la surface de commutation dans la deuxième zone partielle ;
    - couverture d'au moins la première et la deuxième zones partielles par une couche de couverture (4) reliée au matériau support.
  2. Procédé selon la revendication 1, dans lequel le vernis (2) piézoélectrique et/ou le vernis luminescent (3) sont appliqués sur le matériau support (1) par un procédé d'impression sérigraphique.
  3. Procédé selon la revendication 1 ou 2. dans lequel la première zone partielle (A1, A2) et la deuxième zone partielle (B1, B2) se chevauchent au moins par endroits.
  4. Procédé selon l'une des revendications précédentes, dans lequel, en outre, une couche (6) isolant de l'électricité est appliquée entre l'application du vernis piézoélectrique (2) et du vernis luminescent (3).
  5. Procédé selon l'une des revendications 1 à 3, dans lequel le vernis piézoélectrique (2) et le vernis luminescent (3) sont appliqués directement sur le matériau support (1).
  6. Procédé selon l'une des revendications précédentes, dans lequel l'étape d'application d'un vernis piézoélectrique (2) sur le matériau support (1) dans la première zone partielle (A1, A2), chaque fois avec interposition d'une couche isolante dans la première zone (A1, A2), est répétée au moins une fois, de manière que, dans la première zone partielle, soit produit un composite de couches de vernis piézoélectrique et de couches isolantes, disposées les unes sur les autres.
  7. Procédé selon l'une des revendications précédentes, dans lequel, avant et après l'étape d'application d'un vernis luminescent, une couche conductrice est appliquée dans la deuxième zone partielle, de sorte que, dans la deuxième zone partielle, un composite de couches, formées de vernis luminescent et de matériau conducteur, disposées les unes sur les autres, soit produit.
  8. Procédé selon l'une des revendications précédentes, dans lequel la couche de couverture (4) est transparente à la lumière, au moins dans la deuxième zone partielle (B1, B2).
  9. Elément d'actionnement, en particulier pour des véhicules, avec une feuille piézoélectrique/luminescente combinée, fabriquée selon le procédé des revendications précédentes, et une face de décor, opposée au matériau support (1) et disposée sur le côté de la couche de couverture (4).
  10. Elément d'actionnement selon la revendication 9, dans lequel la feuille piézoélectrique/luminescente combinée ne présente qu'un départ de câble.
  11. Elément d'actionnement selon l'une des revendications 9 ou 10, dans lequel au moins deux faces de commutation sont réalisées dans la feuille piézoélectrique/luminescente.
EP05010006A 2004-05-12 2005-05-09 Procédé de fabrication d'une feuille piezo-électrique et luminescente, et élément d'actionnement avec une telle feuille Expired - Lifetime EP1596405B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004023420A DE102004023420A1 (de) 2004-05-12 2004-05-12 Verfahren zum Herstellen einer kombinierten Piezo-/Leuchtfolie und Betätigungselement mit einer derartigen Piezo-/Leuchtfolie
DE102004023420 2004-05-12

Publications (2)

Publication Number Publication Date
EP1596405A1 EP1596405A1 (fr) 2005-11-16
EP1596405B1 true EP1596405B1 (fr) 2007-11-14

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EP05010006A Expired - Lifetime EP1596405B1 (fr) 2004-05-12 2005-05-09 Procédé de fabrication d'une feuille piezo-électrique et luminescente, et élément d'actionnement avec une telle feuille

Country Status (3)

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US (1) US7674347B2 (fr)
EP (1) EP1596405B1 (fr)
DE (2) DE102004023420A1 (fr)

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Publication number Publication date
US7674347B2 (en) 2010-03-09
US20050258710A1 (en) 2005-11-24
EP1596405A1 (fr) 2005-11-16
DE502005001924D1 (de) 2007-12-27
DE102004023420A1 (de) 2005-12-08

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