WO2016020498A1 - Edge-chipping resistant viewing window - Google Patents

Edge-chipping resistant viewing window Download PDF

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Publication number
WO2016020498A1
WO2016020498A1 PCT/EP2015/068202 EP2015068202W WO2016020498A1 WO 2016020498 A1 WO2016020498 A1 WO 2016020498A1 EP 2015068202 W EP2015068202 W EP 2015068202W WO 2016020498 A1 WO2016020498 A1 WO 2016020498A1
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WO
WIPO (PCT)
Prior art keywords
viewing window
layer
window according
ceramic material
brittle
Prior art date
Application number
PCT/EP2015/068202
Other languages
German (de)
French (fr)
Inventor
Lars Schnetter
Lukas BREDE
Original Assignee
Ceramtec-Etec Gmbh
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Publication date
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Publication of WO2016020498A1 publication Critical patent/WO2016020498A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10082—Properties of the bulk of a glass sheet
    • B32B17/10119—Properties of the bulk of a glass sheet having a composition deviating from the basic composition of soda-lime glass, e.g. borosilicate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10293—Edge features, e.g. inserts or holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly

Definitions

  • the invention relates to edge resistant windows in general and displays in particular.
  • the invention relates to viewing windows, which are constructed from laminates of the same or different materials.
  • vision windows made of laminates is in the field of displays, both for stationary devices such as televisions or screens and for mobile devices such as telephones, tablets, laptops, watches and the like. Especially with mobile devices is important that the displays are robust against breaking and scratching, especially when it comes to touch displays, ie those that can be controlled by finger movements on the screen / display.
  • the use of crystalline materials as the topmost laminate layer makes use of the good thermal, chemical and especially mechanical properties of ceramic materials.
  • these materials also have disadvantages, which are in particular due to their crystallinity. If force is exerted selectively on a ceramic, ceramics react even at comparatively low forces with breakage, since they are brittle. Thus, if a dynamic punctiform load is exerted on laminate viewing windows, for example if, for example, a mobile telephone falls on one of its edges or, in particular, one of its corners, the probability of failure of the viewing window due to breaks or cracks is greatest.
  • the object of the invention is therefore to provide a viewing window made of a laminate with a crystalline layer and a high breaking strength.
  • the object is achieved by a viewing window with the features of the invention.
  • the viewing window according to the invention comprises a laminate of identical or different materials, of which at least one layer consists of or at least comprises a crystalline ceramic material or a brittle-hard material.
  • crystalline ceramic materials includes both monocrystalline and polycrystalline materials such as sapphire and transparent polycrystalline ceramics such as Al 2 O 3, spinel, AION ceramics, ceramics from the system Y-Al-O such as YAG.
  • a brittle-hard material is understood in particular to be glasses.
  • the viewing window comprises a laminate of at least one layer of a less brittle material and at least one layer of a crystalline ceramic material or a brittle-hard material, wherein the layers are preferably interconnected via an adhesive layer. All layers, including the composite layer of adhesive, are optically transparent, ie have a RIT (Real Inline Transmission) of more than 70% in the visible range of the wavelength spectrum.
  • RIT Real Inline Transmission
  • the laminate is stacked on top of each other so that around the layer of ceramic material or the spherically hard material, a preferably mutually projecting edge of at least one of the other layers is formed.
  • a narrow adhesive edge is wrapped around the edges of the layer of ceramic material or the sprodharten material, so that occurring dynamic loads, for example, in an impact of the component can be initially absorbed by the adhesive edge.
  • the adhesive edge thus serves at the vulnerable edges of the viewing window and in particular the layer of ceramic material or a sprodharten material as a damping element.
  • the material of the adhesive edge and / or of the composite material adhesive has the same refractive index (deviation of max +/- 0.01, better 0.002) as the layer of ceramic material or the spud-hard material. This leads to the fact that the adhesive edge is not visible and visually creates a uniform surface.
  • the adhesive is precisely metered ⁇ -precise or parts of ⁇ and applied so that when selectively pressing the adjacent layer, the layer of ceramic material or the sprodharten material and the adhesive, just as much glue on the edges is pressed out that this edge is created.
  • the targeted pressing of the layers essentially comprises the adaptation of the contact pressure to the adhesive viscosity and area.
  • the present invention relates to:
  • - Viewing window comprising a laminate of the same or different materials, of which at least one layer comprises a crystalline ceramic material or a spherically hard material.
  • the crystalline ceramic material is a transparent monocrystalline or a transparent polycrystalline material.
  • Viewing window wherein the transparent monocrystalline material is sapphire.
  • Viewing window, wherein the transparent polycrystalline ceramic is selected from the material group consisting of Al2O3, spinel, AION or YAG.
  • the viewing window is a laminate of at least one layer of a less brittle material and at least one layer of a crystalline ceramic material or a brittle-hard material, wherein the layers are connected to one another via an adhesive layer.
  • the material of the adhesive edge has the same refractive index as the layer of ceramic material or the brittle-hard material.

Landscapes

  • Laminated Bodies (AREA)
  • Joining Of Glass To Other Materials (AREA)

Abstract

The invention relates to an edge-chipping resistant viewing window and particularly a viewing window that is constituted of laminates of the same or different materials.

Description

Kantenbruchsicheres Sichtfenster  Shatterproof window
Die Erfindung betrifft kantenbruchfeste Sichtfenster im Allgemeinen und Displays im Besonderen. Insbesondere betrifft die Erfindung Sichtfenster, die aus Laminaten gleicher oder verschiedener Materialien aufgebaut sind. The invention relates to edge resistant windows in general and displays in particular. In particular, the invention relates to viewing windows, which are constructed from laminates of the same or different materials.
Sichtfenster, die aus Laminaten gleicher oder unterschiedlicher Materialien aufgebaut sind, sind Stand der Technik. Die Verwendung von Verbundglasscheiben kann für verschiedenste Zwecke sinnvoll sein, so um Thermowirkungen zu erzeugen oder zu vermeiden, vor Lärm zu schützen oder auch als beschussfestes Sichtfenster. Viewing windows, which are constructed from laminates of the same or different materials, are state of the art. The use of laminated glass may be useful for a variety of purposes, so as to create or avoid thermal effects, to protect against noise or as bullet-proof window.
Eine andere Verwendung von Sichtfenstern aus Laminaten liegt im Bereich von Displays, sowohl für stationäre Geräte wie Fernseher oder Bildschirme als auch für mobile Geräte wie Telefone, Tablets, Laptops, Uhren und dergleichen. Gerade bei mobilen Geräten ist wichtig, dass die Displays robust gegen Zerbrechen und Verkratzen sind, insbesondere auch, wenn es sich um Touchdisplays handelt, also solche, die durch Fingerbewegungen über den Bildschirm/das Display gesteuert werden können. Another use of vision windows made of laminates is in the field of displays, both for stationary devices such as televisions or screens and for mobile devices such as telephones, tablets, laptops, watches and the like. Especially with mobile devices is important that the displays are robust against breaking and scratching, especially when it comes to touch displays, ie those that can be controlled by finger movements on the screen / display.
Um die Robustheit der Sichtfenster zu gewährleisten haben sich auf dem Markt unterschiedliche technische Lösungen etabliert, u.a. die Verwendung von chemisch gehärtetem Glas oder von Saphir-Einkristall-Scheiben. Eine weitere Möglichkeit besteht in der Verwendung eines Laminats aus transparenten Materialien, das zur Benutzungsoberfläche hin durch eine dünne, kristalline Keramik-Schicht abgeschlossen wird. In order to ensure the robustness of the viewing windows, different technical solutions have been established on the market, i.a. the use of chemically tempered glass or sapphire single crystal disks. Another possibility is to use a laminate of transparent materials which is terminated to the user surface by a thin, crystalline ceramic layer.
Die Verwendung von kristallinen Materialien als oberste Laminatschicht nutzt die guten thermischen, chemischen und insbesondere mechanischen Eigenschaften keramischer Werkstoffe. Andererseits haben diese Werkstoffe jedoch auch Nachteile, die insbesondere in ihrer Kristallinität begründet sind. Wird punktuell Kraft auf eine Keramik ausgeübt, reagieren Keramiken schon bei vergleichsweise niedrigen Kräften mit Bruch, da sie spröde sind. Wird also auf Laminat-Sichtfenster eine dynamische punktuelle Belastung ausgeübt, etwa wenn beispielsweise ein Mobiltelefon auf eine seiner Kanten oder insbesondere eine seiner Ecken fällt, ist die Wahrscheinlichkeit des Versagens des Sichtfensters durch Brüche oder Risse am größten. Die Aufgabe der Erfindung besteht somit darin, ein Sichtfenster aus einem Laminat mit einer kristallinen Schicht und einer hohen Bruchfestigkeit bereitzustellen. The use of crystalline materials as the topmost laminate layer makes use of the good thermal, chemical and especially mechanical properties of ceramic materials. On the other hand, however, these materials also have disadvantages, which are in particular due to their crystallinity. If force is exerted selectively on a ceramic, ceramics react even at comparatively low forces with breakage, since they are brittle. Thus, if a dynamic punctiform load is exerted on laminate viewing windows, for example if, for example, a mobile telephone falls on one of its edges or, in particular, one of its corners, the probability of failure of the viewing window due to breaks or cracks is greatest. The object of the invention is therefore to provide a viewing window made of a laminate with a crystalline layer and a high breaking strength.
Die Aufgabe wird durch ein Sichtfenster mit den Merkmalen der Erfindung gelöst. Das erfindungsgemäße Sichtfenster umfasst ein Laminat aus gleichen oder unterschiedlichen Materialien, von denen zumindest eine Schicht aus einem kristallinen keramischen Material oder einem sprödharten Werkstoff besteht oder dieses zumindest umfasst. The object is achieved by a viewing window with the features of the invention. The viewing window according to the invention comprises a laminate of identical or different materials, of which at least one layer consists of or at least comprises a crystalline ceramic material or a brittle-hard material.
Im Rahmen dieser Erfindung umfasst der Begriff kristalline keramische Materialien sowohl einkristalline als auch polykristalline Materialien wie Saphir und transparente polykristalline Keramiken wie AI2O3-, Spinell-, AION- Keramiken, Keramiken aus dem System Y-Al-O wie YAG. Unter einem sprödharten Werkstoff werden insbesondere Gläser verstanden. In the context of this invention, the term crystalline ceramic materials includes both monocrystalline and polycrystalline materials such as sapphire and transparent polycrystalline ceramics such as Al 2 O 3, spinel, AION ceramics, ceramics from the system Y-Al-O such as YAG. A brittle-hard material is understood in particular to be glasses.
Gemäß einer besonders bevorzugten Ausführungsform der Erfindung umfasst das Sichtfenster ein Laminat aus zumindest einer Schicht aus einem weniger spröden Werkstoff und zumindest einer Schicht aus einem kristallinen keramischen Material oder einem sprödharten Werkstoff, wobei die Schichten vorzugsweise über eine Kleberschicht miteinander verbunden sind. Alle Schichten einschließlich der Verbundschicht aus Kleber, sind optisch transparent, weisen also im sichtbaren Bereich des Wellenlängenspektrums eine RIT (Real Inline Transmission) von mehr als 70% auf. According to a particularly preferred embodiment of the invention, the viewing window comprises a laminate of at least one layer of a less brittle material and at least one layer of a crystalline ceramic material or a brittle-hard material, wherein the layers are preferably interconnected via an adhesive layer. All layers, including the composite layer of adhesive, are optically transparent, ie have a RIT (Real Inline Transmission) of more than 70% in the visible range of the wavelength spectrum.
Erfindungsgemäß ist die Schicht aus dem keramischen Material oder dem sprödharten Werkstoff 10 bis 100 μιτι kleiner als die übrigen Schichten. Vorzugsweise wird das Laminat so übereinander gestapelt, dass um die Schicht aus keramischem Material oder dem sprodharten Material ein vorzugsweise allseitig vorstehender Rand von zumindest einer der anderen Schichten entsteht. According to the invention, the layer of the ceramic material or the brittle-hard material 10 to 100 μιτι smaller than the other layers. Preferably, the laminate is stacked on top of each other so that around the layer of ceramic material or the spherically hard material, a preferably mutually projecting edge of at least one of the other layers is formed.
Gemäß einer Weiterbildung der Erfindung wird ein schmaler Kleberand um die Kanten der Schicht aus keramischem Material oder dem sprodharten Werkstoff herumgelegt, so dass auftretende dynamische Belastungen beispielweise bei einem Impakt des Bauteils zunächst durch den Kleberrand aufgefangen werden können. Der Kleberrand dient somit an den verletzlichen Kanten des Sichtfensters und insbesondere der Schicht aus keramischem Material oder einem sprodharten Material als Dämpfungselement. According to one embodiment of the invention, a narrow adhesive edge is wrapped around the edges of the layer of ceramic material or the sprodharten material, so that occurring dynamic loads, for example, in an impact of the component can be initially absorbed by the adhesive edge. The adhesive edge thus serves at the vulnerable edges of the viewing window and in particular the layer of ceramic material or a sprodharten material as a damping element.
Besonders bevorzugt weist das Material des Kleberands und/oder des Verbundmaterials Kleber den gleichen Brechungsindex (Abweichung von max. +/-0,01 besser 0,002) wie die Schicht aus keramischem Material oder dem sprodharten Werkstoff. Dies führt dazu, dass der Kleberand nicht zu erkennen ist und optisch eine gleichmäßige Fläche entsteht. Particularly preferably, the material of the adhesive edge and / or of the composite material adhesive has the same refractive index (deviation of max +/- 0.01, better 0.002) as the layer of ceramic material or the spud-hard material. This leads to the fact that the adhesive edge is not visible and visually creates a uniform surface.
Zur Herstellung eines solchen Kleberands wird der Kleber μΙ-genau oder auf Teile vom μΙ genau dosiert und derart aufgebracht, dass beim gezielten Verpressen der angrenzenden Schicht, der Schicht aus keramischem Material oder dem sprodharten Werkstoff und dem Kleber, gerade so viel Kleber an den Rändern herausgepresst wird, dass dieser Rand entsteht. Das gezielte Verpressen der Schichten umfasst im Wesentlichen die Anpassung des Anpressdrucks auf die Kleberviskosität und Fläche. To produce such an adhesive edge, the adhesive is precisely metered μΙ-precise or parts of μΙ and applied so that when selectively pressing the adjacent layer, the layer of ceramic material or the sprodharten material and the adhesive, just as much glue on the edges is pressed out that this edge is created. The targeted pressing of the layers essentially comprises the adaptation of the contact pressure to the adhesive viscosity and area.
Die vorliegende Erfindung betrifft: The present invention relates to:
- Sichtfenster, umfassend ein Laminat aus gleichen oder unterschiedlichen Materialien, von denen zumindest eine Schicht ein kristallines keramisches Material oder einen sprodharten Werkstoff umfasst. - Viewing window, comprising a laminate of the same or different materials, of which at least one layer comprises a crystalline ceramic material or a spherically hard material.
- Sichtfenster, wobei das kristalline keramische Material ein transparentes einkristallines oder ein transparentes polykristallines Material ist.  - Viewing window, wherein the crystalline ceramic material is a transparent monocrystalline or a transparent polycrystalline material.
- Sichtfenster, wobei das transparente einkristalline Material Saphir ist. Sichtfenster, wobei die transparente polykristalline Keramik ausgewählt wird aus der Materialgruppe, bestehend aus AI2O3, Spinell, AION oder YAG. Viewing window, wherein the transparent monocrystalline material is sapphire. Viewing window, wherein the transparent polycrystalline ceramic is selected from the material group consisting of Al2O3, spinel, AION or YAG.
Sichtfenster, wobei der sprödharte Werkstoff zu Gläsern gehört.  View window, where the brittle-hard material belongs to glasses.
Sichtfenster, wobei das Sichtfenster ein Laminat aus zumindest einer Schicht aus einem weniger spröden Werkstoff und zumindest einer Schicht aus einem kristallinen keramischen Material oder einem sprödharten Werkstoff ist, wobei die Schichten über eine Kleberschicht miteinander verbunden sind. Viewing window, wherein the viewing window is a laminate of at least one layer of a less brittle material and at least one layer of a crystalline ceramic material or a brittle-hard material, wherein the layers are connected to one another via an adhesive layer.
Sichtfenster, wobei alle Schichten einschließlich der Verbundschicht aus Kleber, im sichtbaren Bereich des Wellenlängenspektrums eine RIT (Real Inline Transmission) von mehr als 70% aufweisen.  Viewing window, with all layers, including the composite layer of adhesive, in the visible range of the wavelength spectrum having a RIT (Real Inline Transmission) of more than 70%.
Sichtfenster, wobei die Schicht aus dem keramischen Material oder dem sprödharten Werkstoff 10 bis 100 μιτι kleiner ist als die übrigen Schichten. Viewing window, wherein the layer of the ceramic material or the brittle material 10 to 100 μιτι smaller than the other layers.
Sichtfenster, wobei um die Schicht aus keramischem Material oder dem sprödharten Material ein vorzugsweise allseitig vorstehender Rand von zumindest einer der anderen Schichten entsteht.  Viewing window, wherein around the layer of ceramic material or the brittle-hard material, a preferably mutually projecting edge of at least one of the other layers is formed.
Sichtfenster, wobei ein schmaler Kleberand um die Kanten der Schicht aus keramischem Material oder dem sprödharten Werkstoff herumgelegt wird.  Viewing window, wherein a narrow adhesive edge is wrapped around the edges of the layer of ceramic material or the brittle-hard material.
Sichtfenster, wobei das Material des Kleberands den gleichen Brechungsindex wie die Schicht aus keramischem Material oder dem sprödharten Werkstoff aufweist.  Viewing window, wherein the material of the adhesive edge has the same refractive index as the layer of ceramic material or the brittle-hard material.

Claims

Patentansprüche claims
1 . Sichtfenster, dadurch gekennzeichnet, dass das Sichtfenster ein Laminat aus gleichen oder unterschiedlichen Materialien umfasst, von denen zumindest eine Schicht ein kristallines keramisches Material oder einen sprödharten Werkstoff umfasst.  1 . Viewing window, characterized in that the viewing window comprises a laminate of the same or different materials, of which at least one layer comprises a crystalline ceramic material or a brittle-hard material.
2. Sichtfenster nach Anspruch 1 , dadurch gekennzeichnet, dass das kristalline keramische Material ein transparentes einkristallines oder ein transparentes polykristallines Material ist. 2. A viewing window according to claim 1, characterized in that the crystalline ceramic material is a transparent monocrystalline or a transparent polycrystalline material.
3. Sichtfenster nach Anspruch 2, dadurch gekennzeichnet, dass das transparente einkristalline Material Saphir ist. 3. window according to claim 2, characterized in that the transparent monocrystalline material is sapphire.
4. Sichtfenster nach Anspruch 2, dadurch gekennzeichnet, dass die transparente polykristalline Keramik ausgewählt wird aus der4. viewing window according to claim 2, characterized in that the transparent polycrystalline ceramic is selected from the
Materialgruppe, bestehend aus AI2O3, Spinell, AION oder YAG. Material group consisting of Al 2 O 3, spinel, AION or YAG.
5. Sichtfenster nach Anspruch 1 , dadurch gekennzeichnet, dass der sprödharte Werkstoff zu Gläsern gehört. 5. window according to claim 1, characterized in that the brittle-hard material belongs to glasses.
6. Sichtfenster nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sichtfenster ein Laminat aus zumindest einer Schicht aus einem weniger spröden Werkstoff und zumindest einer Schicht aus einem kristallinen keramischen Material oder einem sprödharten Werkstoff ist, wobei die Schichten über eine Kleberschicht miteinander verbunden sind. 6. viewing window according to one of the preceding claims, characterized in that the viewing window is a laminate of at least one layer of a less brittle material and at least one layer of a crystalline ceramic material or a brittle-hard material, wherein the layers are connected to each other via an adhesive layer ,
7. Sichtfenster nach Anspruch 6, dadurch gekennzeichnet, dass alle Schichten einschließlich der Verbundschicht aus Kleber, im sichtbaren Bereich des Wellenlängenspektrums eine RIT (Real Inline Transmission) von mehr als 70% aufweisen. 7. A viewing window according to claim 6, characterized in that all layers including the composite layer of adhesive, in the visible range of the wavelength spectrum, a RIT (Real Inline Transmission) of more than 70%.
8. Sichtfenster nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schicht aus dem keramischen Material oder dem sprodharten Werkstoff 10 bis 100 μιτι kleiner ist als die übrigen Schichten. 8. viewing window according to one of the preceding claims, characterized in that the layer of the ceramic material or the sprodharten material 10 to 100 μιτι smaller than the other layers.
9. Sichtfenster nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass um die Schicht aus keramischem Material oder dem sprodharten Material ein vorzugsweise allseitig vorstehender Rand von zumindest einer der anderen Schichten entsteht. 9. A viewing window according to one of the preceding claims, characterized in that around the layer of ceramic material or the sprodheart material a preferably mutually projecting edge of at least one of the other layers is formed.
10. Sichtfenster nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein schmaler Kleberand um die Kanten der Schicht aus keramischem Material oder dem sprodharten Werkstoff herumgelegt wird. 10. viewing window according to one of the preceding claims, characterized in that a narrow adhesive edge is wrapped around the edges of the layer of ceramic material or the sprodharten material.
1 1 . Sichtfenster nach Anspruch 10, dadurch gekennzeichnet, dass das Material des Kleberands den gleichen Brechungsindex wie die Schicht aus keramischem Material oder dem sprodharten Werkstoff aufweist. 1 1. Viewing window according to claim 10, characterized in that the material of the adhesive edge has the same refractive index as the layer of ceramic material or the sprodharten material.
PCT/EP2015/068202 2014-08-07 2015-08-06 Edge-chipping resistant viewing window WO2016020498A1 (en)

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PCT/EP2015/068202 WO2016020498A1 (en) 2014-08-07 2015-08-06 Edge-chipping resistant viewing window

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DE102017128434A1 (en) * 2017-11-30 2019-06-06 Endress+Hauser SE+Co. KG Housing cover for a field device

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