Schott Ag

Volker Seibert

Andreas Langsdorf

Clemens Ottermann

Thomas Roßmeier

Thomas Westerhoff

Martin Schaefer

Bernd Hoppe

Ulrich Lange

Thilo Zachau

Kurt Nattermann

Holger Wegener

Otmar Becker

Doris Moseler

Andreas Habeck

Ralf Jedamzik

Thorsten Doehring

Holger Hunnius

Axel Ohlinger

Martin Lotze

Georg Haselhorst

Alexander Glacki

Ralf Reiter

Gregor Rösel

Christian Breitbach

Marco Weisenburger

Reinhard Kassner

Bernd Rüdinger

Wolfgang Munch

Martin Schaeffer

Hans-Joachim Nowak

Patrick Markschlaeger

Roland Bürkle

Markus Heiss

Patrick Markschläger

An apparatus is provided for drawing glass ribbons from molten glass. The apparatus includes a drawing tank for holding the molten glass and a guiding body. The tank has a lower nozzle opening through which the molten glass can exit downwards. The nozzle opening has two nozzle slots defined between the guiding body and edges of the nozzle opening. The guiding body protrudes downward out of the nozzle opening. The guiding body is supported so as to be spaced apart from the edges with the guiding body suspended in a self-supporting manner at least along a central section of the nozzle opening.

Apparatus and method for producing glass ribbons

A mirror, a mirror substrate, a method for producing are provided. The mirror substrate is made of a material having a coefficient of mean linear thermal expansion of less than or equal to 1*10/K. The mirror substrate includes at least one feature selected from a group consisting of: a ratio of a lateral dimension to a maximum thickness of at least 100, a ratio of the lateral dimension to the maximum thickness of at least 150, a ratio of the lateral dimension to the maximum thickness of at least 200, a ratio of the lateral dimension to the maximum thickness of at least 300, a weight per unit area of 100 kg/mor less, a weight per unit area of 50 kg/mor less, a weight per unit area of 30 kg/mor less, a weight per unit area of 15 kg/mor less, a mirror surface with a roughness (R) of at most 3.5 μm, and a mirror surface with a roughness (R) of less than 1.2 μm.

Mirror and mirror substrate with high aspect ratio, and method and means for producing such a mirror substrate

A method for testing the strength of a sheet-like element having two opposite faces and made of hard brittle material under tensile stress is provided. The method includes passing each of the faces of the element over a roller and thereby bending the element so that each of the faces is subjected to a first tensile stress in a portion in which the opposite face is in contact with a surface of the roller; exerting a second tensile force on the element in the direction of advancement so that both faces are subjected to the second tensile stress of at least 2 MPa so that the first and second tensile stresses add up to define a resultant tensile stress; and monitoring the element and determining whether the element has a defined breaking strength equal to the resultant tensile stress or whether the element breaks under the resultant tensile stress.

Apparatus for testing the strength of sheets made of hard brittle material under tensile stress

A method and an apparatus for stabilizing the position of a sheet-like element made of hard brittle material during transportation thereof along a transport path is provided in which the element is guided through a roller chicane having three rollers.

Apparatus and method for stabilizing sheets of a hard brittle material

Method for testing the strength of sheets made of hard brittle material under tensile stress

A method for producing, without a mold, a shaped glass article having a predefined geometry is provided. The method includes providing a starting glass, supporting the starting glass, heating a portion of the starting glass so that in the portion a predetermined spatial viscosity distribution of the starting glass is obtained from 10to 10dPa&#xb7;s and so that at points where the starting glass is supported a predetermined spatial viscosity distribution of the starting glass does not fall below 10dPa&#xb7;s, and deforming the heated starting glass by action of an external force until the predefined geometry of the glass article is obtained.

Shaped glass article having a predefined geometry produced without using a mold, method and use of the same

In a substrate, particularly in a substrate for a mirror support, in which recesses are introduced in one surface, preferably in the back side of the substrate, as a result of which, in particular, bridging pieces are defined between the recesses, in order to achieve the situation that despite a reduced weight, a high rigidity still remains, which means only a slight sagging after its correct uptake in a holding device provided for it, it is provided that at least one first portion of the bridging pieces has a width that is different than a second portion of the bridging pieces.

Substrate for a mirror support with reduced weight as well as mirror with reduced-weight mirror support

A monolithic substrate of glass or glass ceramics and methods for manufacturing are provided, where the substrate has a lightweight structure. The lightweight structure includes recesses that are delimited by webs, such webs forming tetragonal or four-corner-shaped pockets. Due to the lightweight structure, the weight of the substrate can be significantly reduced, and at the same time a high rigidity can be ensured. The substrate can be used as a mirror support or a mirror and can be employed terrestrially and/or extra-terrestrially.

Substrate with lightweight structure

The invention concerns a method for separating plate-shaped workpieces of mechanically brittle and nonmetal materials along any contour desired, comprising the following steps:

Method and device for separating plates from mechanically brittle and nonmetal materials

A flat light source having a front plate and a rear part. The front plate is held at a distance from the rear part by spacers. A gaseous filling which is under a pressure lower than the ambient atmospheric pressure is introduced into the intermediate space between the front plate and rear part, and the front plate is of a glass material. To be able to produce flat light sources of this type which have a low intrinsic weight, according to this invention the front plate and/or the rear part can be configured as an at least partly thermally or chemically tempered glass pane or the front plate and/or the rear part can be configured as a glass pane which at least in areas is coated with ductile polymer material.

Flat light source

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Hochheim, Germany

Volker Seibert