Schott Ag

Thomas Westerhoff

Volker Seibert

Martin Schaefer

Ralf Jedamzik

Thorsten Doehring

Ralf Reiter

Marco Weisenburger

Martin Schaeffer

Hans-Joachim Nowak

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

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

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Mainz, Germany

Thomas Westerhoff