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EP1062628A1 - Clavier en verre, et procede de production d'un clavier en verre - Google Patents

Clavier en verre, et procede de production d'un clavier en verre

Info

Publication number
EP1062628A1
EP1062628A1 EP99913229A EP99913229A EP1062628A1 EP 1062628 A1 EP1062628 A1 EP 1062628A1 EP 99913229 A EP99913229 A EP 99913229A EP 99913229 A EP99913229 A EP 99913229A EP 1062628 A1 EP1062628 A1 EP 1062628A1
Authority
EP
European Patent Office
Prior art keywords
carrier material
thin glass
glass
pane
keyboard
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Withdrawn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
EP99913229A
Other languages
German (de)
English (en)
Inventor
Karl-Otto Platz
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE29924124U priority Critical patent/DE29924124U1/de
Publication of EP1062628A1 publication Critical patent/EP1062628A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/038—Anti-vandalism

Definitions

  • the invention relates to a glass keyboard according to the preamble of claim 1 and a method for producing a glass keyboard according to the preamble of claim 23.
  • Such pressure switching elements are known as touch panels in display displays.
  • the touch panels usually consist of transparent plastic films, the inner surfaces of which are coated in an electrically conductive manner.
  • spacers are glued in the air gap, a spacer circumferentially around the contact area being welded airtight to the plastic foils to stabilize the internal air pressure and thereby supporting the upper foil at the same time.
  • Elastic spacers are additionally arranged within the contact area in order to ensure that the foils are reset.
  • the known pressure maintenance element has the disadvantage of requiring a hermetically sealed air space - 2 -
  • EP 0 546 003 B1 discloses a pressure switch element formed from a glass laminate, which is formed from a flexible thin glass pane and at least one carrier glass pane, each of which has an electrically conductive layer on the mutually facing surfaces.
  • the opposing electrically conductive layers are kept at a distance using a spacer.
  • the electrically conductive layers touch one another at the essentially point-specific pressure load point.
  • Another problem is to achieve a sufficient restoring force of the thin glass pane on large keyboard areas without providing additional spacers within the button.
  • the invention is therefore based on the object of providing a glass keyboard which allows the production of large keyboard areas.
  • the invention advantageously provides that the keyboard surface consisting of the flexible thin glass pane is flat in the edge area and is slightly convex in the switching area to the outside.
  • the convex curvature of the keyboard surface on the one hand improves the return behavior of the thin glass pane after actuation and on the other hand prevents the formation of Newton's rings, which are undesirable for optical reasons in a glass keyboard.
  • the thin glass pane is preferably glued to the carrier material pane in the deep-drawn state.
  • the thin glass pane is deep-drawn in the cold state and in this state is also glued to the carrier material pane, so that the convex curvature of the keyboard surface is retained.
  • Such a glass keyboard allows the production of large keyboard areas. Because no spacer is required in the entire switching area of the glass keyboard, any point on the keyboard surface can be selected as the switching point. - 4 -
  • the flexible thin glass pane consists of a drawn thin glass film. It is essential that the thin glass pane is made from a drawn thin glass film, because only one is sufficiently stable and flexible at the same time.
  • the drawn thin glass film therefore makes it possible to produce an unbreakable thin glass pane that can be bent sufficiently to enable contact to be made between the electrically conductive layers facing one another.
  • the edge of the thin glass pane is stabilized with a hardened plastic.
  • the cut edge of the thin glass pane has several microcracks going inwards from the edge, which have arisen from the cutting process. These micro cracks can very easily cause a crack that destroys the entire thin glass pane.
  • the edge of the thin glass pane is therefore preferably stabilized with a hardened plastic.
  • the thin glass pane with its boundary edges is immersed, for example, in a still thin plastic. Due to capillary action, the microcracks are filled with the liquid plastic and then the plastic is hardened. After the plastic has hardened, the thin glass pane has a considerably higher stability, since the edges of the thin glass pane can no longer tear under pressure or impact loads.
  • the carrier material pane is slightly larger relative to the flexible thin glass pane, so that the edge region of the carrier material pane protrudes relative to the edge region of the thin glass pane.
  • the protruding edge of the carrier material disc protects - 5 -
  • the flat recessed edge of the thin glass pane is glued to the edge area of the carrier material pane with the interposition of an adhesive as a spacer in the edge area.
  • the protruding edge of the carrier material pane also serves to receive an adhesive bead, which also protects the sensitive edge of the thin glass pane.
  • the thickness of the thin glass pane is approximately 0.1 to 0.5 mm, preferably between approximately 0.175 and 0.4 mm.
  • a thin glass pane in this thickness range has sufficient flexibility to enable switching contact between the opposite electrical layers with pinpoint accuracy.
  • the spacer is arranged exclusively in the edge area of the keyboard surface between the thin glass pane and the carrier material pane, the remaining keyboard surface being selectively switchable at any point without further spacers.
  • the invention advantageously makes it possible to dispense with additional spacers in the area of the button, so that the entire keyboard surface is available for switching operation without restrictions.
  • the spacer is formed in the edge region from a plastic that cures under UV light. This has the advantage that no separate spacer has to be provided and that the spacer can already be formed when the thin glass pane is glued together with the carrier material pane.
  • the carrier material disk is preferably transparent. This enables, for example, keyboard labels and / or lighting means to be arranged behind the carrier material disc.
  • the carrier material disk is preferably made of glass.
  • Glass has the advantage that the coefficients of expansion of a glass substrate and the electrically conductive layer, e.g. an indium tin oxide layer, have only slight differences, so that the risk of cracking in the electrically conductive layer is reduced.
  • the carrier material pane consists of a transparent glass cell with an integrated electroluminescent matrix (EL display glass).
  • the carrier material disc can consist of a laminated glass for splinter protection.
  • a glass keyboard can be used advantageously in areas where there is a risk of explosion or vandalism.
  • laminated glass has the further advantage of creating a barrier effect for UV light.
  • the carrier material pane can have a heating device on the side facing away from the thin glass pane.
  • the heating device preferably consists of an electrically conductive, transparent coating of the carrier material disk. - 7 -
  • the carrier material pane can also have an electrically conductive shielding layer on the side facing away from the thin glass pane, which shields against electromagnetic interference which arises behind the glass keyboard, e.g. shields from the control electronics of the display and thus reduces the susceptibility to electromagnetic interference of the glass keyboard.
  • the transparent carrier material disk can form an optical filter or can be provided with such a filter.
  • a further development of the invention provides that the carrier material disc has on the side facing away from the thin glass disc a receiving device for an exchangeable panel for keyboard lettering.
  • a receiving device for example, of an insert pocket for the exchangeable table.
  • the interchangeability of the keyboard labeling makes it possible to individually define the functions of certain keyboard fields or to change them later. For example, with a machine control, it is possible to assign the keyboard fields on the keyboard surface to other functions as required.
  • the carrier material pane and / or the spacer have ventilation openings in the edge region for the space between the thin glass pane and the carrier material pane.
  • the ventilation openings are preferably provided with a filter material which protects the glass keyboard from dirt.
  • the carrier material pane can have a light-scattering layer on the side facing away from the thin glass pane.
  • a coating or surface treatment is advantageous, for example, with a backlight.
  • the thin glass pane can have a decorative edge on its underside.
  • the decorative edge has the advantage that, on the one hand, the operable keyboard surface is limited, whereby the operable button is visually recognizable and, on the other hand, the advantage of allowing larger manufacturing and installation tolerances of underlying devices, such as LCD displays, which can reduce production costs.
  • FIG. 2 shows a cross section through the glass keyboard of FIG. 1, - 9 -
  • FIG. 4A shows the detail in Fig. 4,
  • FIG. 5 shows a glass keyboard with a laminated glass pane as the carrier material pane
  • FIG. 6 shows an exemplary embodiment with an electrically conductive layer on the back of the carrier material pane and a decorative edge under the thin glass pane
  • Fig. 7 is a plan view of the embodiment of Fig. 6, and
  • FIG 8 shows an embodiment of the glass keyboard and 9 a receiving pocket for a panel behind the carrier material disc.
  • the glass keyboard shown in FIG. 1 consists of a lower, relatively thick carrier material pane 12 and a thin glass pane 2, which is held in parallel with the aid of a spacer 12 and at a distance from the carrier material pane 6.
  • the thin glass pane 2 and the carrier material pane 6 are on the mutually opposite inner surfaces with electrically conductive layers 8,10 provided, form the electrodes and which make contact when they touch each other.
  • the flexible thin glass pane 2 can be deformed by essentially pressurizing it in such a way that an electrical contact is made between the conductive layers 8, 10. - 10 -
  • Such a structure of the glass keyboard can be used both for analog glass keyboards, in which the electrically conductive layers 8, 10 essentially cover the entire keyboard surface 4, and for digital glass keyboards, in which the electrically conductive layers 8, 10 are structured and, for example, from one There are a large number of mutually parallel conductor tracks.
  • the conductor tracks on the electrically conductive layer 8 preferably run at right angles to the conductor tracks on the electrically conductive layer 10.
  • the thin glass pane 2 is cut from a drawn thin glass film and has a thickness between approximately 0.1 and 0.5 mm, preferably between approximately 0.175 and 0.4 mm. Floated glass of the same thickness has a tin film that leads to embrittlement of the glass and is therefore not suitable for this purpose. Only thin glass panes that are produced from a drawn glass film have sufficient flexibility and breaking strength to also produce larger keyboard surfaces 4. Furthermore, a high degree of uniformity of the glass thickness is important.
  • the thin glass pane 2 is curved slightly convex outwards and in this state, with the interposition of the spacer 12, glued to the carrier material pane 6.
  • the thin glass pane 2 is deep-drawn, leaving a flat edge region 20.
  • the spacer is preferably formed from the adhesive connecting the two panes 2, 6, adhesive bonding taking place only at the edge of the edge region 20 of the thin glass pane 2.
  • the carrier material pane 6 projects on all sides relative to the thin glass pane 2 and thereby enables effective protection of the em- - 11 -
  • the protruding edge of the carrier material pane 6 forms a support surface for an adhesive bead 14 formed from the adhesive, which extends to the upper edge of the thin glass pane 2.
  • This adhesive bead 14 additionally protects the sensitive outer edge of the thin glass pane 2.
  • the convex curvature of the thin glass pane 2 to the outside has the advantage that higher restoring forces arise and that the thin glass pane 2 does not require any additional spacers in the area of the keyboard surface 4. It is essential that no spacers are contained in the switching area 24 of the keyboard surface 4, since a switching contact could not be produced in the area of such spacers.
  • the glass keyboard described here can be operated at any point on the keyboard surface 4.
  • Another advantage of the convex elevation of the thin glass pane 2 to the outside is that it prevents the formation of Newton's rings, which are undesirable in transparent keyboards.
  • the use of glass as the keyboard surface 4 has the advantage of creating a scratch-resistant glass keyboard with high transmission, which has a higher chemical resistance and is antistatic.
  • the temperature expansion coefficients and the deformation behavior under pressure of glass and electrically conductive layer have a slight difference, so that the risk of cracking in the electrically conductive layers is considerably reduced compared to plastic films.
  • the thin glass pane 2 can be provided with edge stabilization.
  • the edge stabilization is achieved in that the thin glass sheet 2 cut from a drawn thin glass film is immersed with its cut edges in a highly viscous, hardenable plastic.
  • the liquid plastic penetrates into microcracks 18 in the edge region 20, which are created by the cutting process, these microcracks 18 being filled with the plastic material 16 by the subsequent curing of the plastic in such a way that the microcracks 18 no longer pose a risk of breakage.
  • the adhesive then performs several functions, namely the function of a spacer 12 between the thin glass pane 2 and the carrier material pane 6, the function as an edge stabilizer by penetrating the adhesive into microcracks 18 in the edge region 20 of the thin glass pane 2 and the function as an external edge protection for the Thin glass pane 2 by forming an adhesive bead 14 on the protruding edge of the carrier material disk 6.
  • the adhesive bead 14 is preferably produced in a second operation.
  • the edge of the carrier material pane 6 projects, for example, by approximately 1 mm relative to the outer edges of the thin glass pane 2 and thus also forms an effective impact protection on the outer edge of the glass keyboard in conjunction with the adhesive bead 14.
  • the carrier material disk is preferably made of transparent material. This has the advantage that the - 13 -
  • Glass keyboard behind the carrier material disc 6 can be provided with labeling fields or labels of any design. Furthermore, lighting devices, e.g. LED lamps for function displays or for illuminating the panel 48 can be arranged behind the carrier material disc 6. It is understood that screens or LCD displays and the like behind the carrier material disc. can be arranged.
  • a plastic which cures under UV light is preferably used as the adhesive.
  • Such an adhesive has the advantage that the time of curing can be precisely controlled, which considerably simplifies the manufacturing process.
  • the carrier material disk 6 particularly preferably consists of glass.
  • the thickness of the carrier material disk 6 depends on the expected mechanical loads and is preferably more than 1 mm. It is also possible to provide a carrier material disc -6 made of thin glass if another support structure is arranged behind the carrier material disc 6.
  • the carrier material disk 6 can also consist of a laminated glass 22.
  • the glass carrier material pane 6 can be provided on the side facing away from the thin glass pane 2 with an adhesive or a film which is connected to a second glass pane.
  • the film can also be colored.
  • Such a laminated glass serves as splinter protection and is intended, for example, for the use of the glass keyboards in areas in which there is a risk of explosion or vandalism.
  • the carrier material pane 6 or the laminated glass pane 32 can be provided on the side facing away from the thin glass pane 2 with an electrically conductive layer, which serves, for example, as a shielding layer 40 against electromagnetic radiation or as a heating device 36.
  • the electrical coating has a resistance value of over 100 ⁇ D to form a surface heating. With a resistance value ⁇ 20 ⁇ D, the electrical coating is suitable as a shield.
  • the underside of the thin glass pane 2 can have a decorative edge 60 in its edge region 20, which preferably ends inwards with a punctiform grid.
  • This decorative edge is produced using screen printing technology and forms a mask that defines the switching area 24 of the keyboard surface 4.
  • the decorative edge forms a privacy screen with respect to the glued edge area 20, 28 of the glass keyboard, as well as a privacy screen with respect to the circumferential conductor track guide for contacting the electrical layers 8, 10. Due to the fact that the decorative edge gradually transitions into the transparent area with a dot pattern, an LCD display located behind the carrier material disk can be mounted with greater tolerance and thus more cost-effectively.
  • the decorative edge covers the connection contacts glued to the carrier plate. - 15 -
  • the carrier material pane 6 can be made matt or opaque on the side facing away from the thin glass pane 2 in order to scatter the light behind LED displays.
  • a receiving device 44 for an exchangeable insert panel 48 to be arranged on the side of the carrier material disk 6 facing away from the thin glass pane 2.
  • the slide-in board 48 serves to identify keyboard fields on the keyboard surface 4.
  • the slide-in board 48 can, for example, consist of paper and be printed with characters or symbols.
  • the paper can be laminated waterproof.
  • the insert panel 48 can also be made of plastic.
  • the receiving device 44 for the slide-in board 48 is formed from a transparent or opaque plate 50 which is fastened at a distance from the carrier material disk 6 such that a slide-in pocket for the slide-in board 48 is formed.

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)
  • Push-Button Switches (AREA)

Abstract

L'invention concerne un clavier en verre comportant une surface (4) constituée d'une vitre en verre mince (2) et au moins une vitre en matériau de support (6) qui présentent sur leurs faces en vis-à-vis, chacune une couche (8, 10) électroconductrice. Les couches électroconductrices (8, 10) superposées sont maintenues à une certaine distance l'une de l'autre par un écarteur (12). Ces couches électroconductrices (8, 10) se touchent lorsqu'une pression est appliquée à la vitre en verre mince (8) flexible, au niveau de la zone de sollicitation en pression sensiblement ponctuelle. Dans un tel clavier, il est prévu que la surface (4) constituée de la vitre en verre mince (2) flexible soit plane dans la zone marginale (20) et faiblement convexe vers l'extérieur dans la zone de commutation (24), et que la vitre en verre mince (2) formant la surface de clavier soit collée, à l'état embouti profond, avec la vitre en matériau support (6).
EP99913229A 1998-03-11 1999-03-05 Clavier en verre, et procede de production d'un clavier en verre Withdrawn EP1062628A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29924124U DE29924124U1 (de) 1998-03-11 1999-03-05 Glastastatur

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19810327A DE19810327A1 (de) 1998-03-11 1998-03-11 Glastastatur, sowie Verfahren zur Herstellung einer Glastastatur
DE19810327 1998-03-11
PCT/EP1999/001431 WO1999046725A1 (fr) 1998-03-11 1999-03-05 Clavier en verre, et procede de production d'un clavier en verre

Publications (1)

Publication Number Publication Date
EP1062628A1 true EP1062628A1 (fr) 2000-12-27

Family

ID=7860391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99913229A Withdrawn EP1062628A1 (fr) 1998-03-11 1999-03-05 Clavier en verre, et procede de production d'un clavier en verre

Country Status (4)

Country Link
EP (1) EP1062628A1 (fr)
AU (1) AU3143999A (fr)
DE (1) DE19810327A1 (fr)
WO (1) WO1999046725A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9348425B2 (en) 2013-02-05 2016-05-24 Corning Incorporated Glass keyboard
DE202017000799U1 (de) 2017-02-15 2017-05-17 Frautz Beteiligungen GmbH & Co. KG Vorrichtung zur universalen Anpassung, insbesondere einer Beschriftung eines Gerätesystems

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0546003T3 (da) * 1990-08-30 1995-05-29 Platz Karl Otto Trykomskifter
US5220136A (en) * 1991-11-26 1993-06-15 Elographics, Inc. Contact touchscreen with an improved insulated spacer arrangement
DE69431055T2 (de) * 1993-04-28 2003-01-23 Nissha Printing Durchsichtige berührungsempfindliche tafel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9946725A1 *

Also Published As

Publication number Publication date
AU3143999A (en) 1999-09-27
WO1999046725A1 (fr) 1999-09-16
DE19810327A1 (de) 1999-09-16

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