TY - PAT A1 - Schäfer, Martin A1 - Döhring, Thorsten A1 - Seibert, Volker A1 - Westerhoff, Thomas A1 - Nowak, Hans-Joachim T1 - SUBSTRATE FOR MIRROR SUPPORT WITH REDUCED WEIGHT AND MIRROR PROVIDED WITH MIRROR SUPPORT WITH REDUCED WEIGHT N2 - To provide a substrate for a mirror support, in which there still remains a high rigidity, despite a reduced weight. ;SOLUTION: 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 in which despite a reduced weight, a high rigidity still remains, which means only a slight sagging after the correct take-in of the substrate in a holding device provided for it, at least one first position of the bridging pieces includes a width that is different from a second portion of the bridging pieces. KW - astronomy KW - mirror KW - lightweight KW - Zerodur KW - ceramic KW - Spiegeloptik KW - Raumfahrt Y1 - 2013 UR - http://worldwide.espacenet.com/publicationDetails/biblio?CC=JP&NR=5244050B2&KC=B2&FT=D&ND=4&date=20130724&DB=EPODOC&locale=de_EP ER - TY - PAT A1 - Schäfer, Martin A1 - Döhring, Thorsten A1 - Seibert, Volker A1 - Westerhoff, Thomas A1 - Nowak, Hans-Joachim T1 - Substrate for a mirror support with reduced weight as well as mirror with reduced-weight mirror support N2 - Diesen Text übersetzen Erste Seite Clipping von US8911098 (B2) 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. KW - astronomy KW - mirror KW - lightweight KW - Zerodur KW - ceramic KW - Spiegeloptik KW - Raumfahrt Y1 - 2014 UR - http://worldwide.espacenet.com/publicationDetails/biblio?CC=US&NR=8911098B2&KC=B2&FT=D&ND=5&date=20141216&DB=EPODOC&locale=de_EP ER - TY - PAT A1 - Schäfer, Martin A1 - Döhring, Thorsten A1 - Seibert, Volker A1 - Westerhoff, Thomas A1 - Nowak, Hans-Joachim T1 - Mirror supporting substratum for e.g. terrestrial observation, has spacers defined between one set of recesses and/ or two set of recesses, where part of one set of spacers has width different from width of part of other set of spacers N2 - The substratum (1) has two set of recesses (2, 3, 4, 7, 8) formed in a rear face (16), where the substratum is produced from a monolithic block of material including a lithium- aluminum- silicon type glass ceramic material. Set of spacers (5, 6, 9, 10) are defined between one set of recesses (2, 3, 4) and/ or the two set of recesses. A part of one set of spacers (5, 6) defined by the former recesses has width different from width of a part of other set of spacers (9, 10) defined by the latter recesses. KW - astronomy KW - mirror KW - lightweight KW - Zerodur KW - ceramic KW - Spiegeloptik KW - Raumfahrt Y1 - 2015 UR - http://worldwide.espacenet.com/publicationDetails/biblio?CC=FR&NR=2935178B1&KC=B1&FT=D&ND=5&date=20150313&DB=EPODOC&locale=de_EP ER - TY - CHAP A1 - Döhring, Thorsten A1 - Jedamzik, Ralf A1 - Westerhoff, Thomas T1 - Four decades of ZERODUR mirror substrates for astronomy T2 - Proceedings of SPIE KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 VL - 7281 IS - 728103 ER - TY - PAT A1 - Schäfer, Martin A1 - Döhring, Thorsten A1 - Seibert, Volker A1 - Westerhoff, Thomas A1 - Nowak, Hans-Joachim T1 - Substrate for a mirror support with reduced weight as well as mirror with reduced-weight mirror support KW - Spiegeloptik Y1 - 2008 ER - TY - CHAP A1 - Krieg, Janina A1 - Carre, Antoine A1 - Döhring, Thorsten A1 - Hartmann, Peter A1 - Hull, Tony A1 - Jedamzik, Ralf A1 - Westerhoff, Thomas T1 - The past decade of ZERODUR® glass-ceramics in space applications T2 - Proceedings of SPIE N2 - For the past four decades, ZERODUR® glass ceramics has flown on many satellites including the prominent space missions METEOSAT, Hubble Space Telescope, CHANDRA, and LISA pathfinder. Firstly, this unique material is chosen as mirror substrate for high precision optics due to its extreme thermal stability. Its near-zero thermal expansion over a wide temperature range of several tens of Kelvin is homogenous within the entire volume. This enables control of the ZERODUR®’s surface profile at the 10-picometer level. SCHOTT has conducted comprehensive material characteristics studies on the mechanical properties and the radiation environment effects experienced in realistic orbits to define the suitability of ZERODUR® to survive both high loads during launch and to support long-term missions, respectively. Besides these advantageous material properties, this glass-ceramics can be extremely light-weighted by precision grinding enabled by the new SCHOTT competence center for machining and metrology. In this paper, we will continue to trace the recent developments of ZERODUR® glass ceramics as space material in the context of selected missions flown since 2009 and those anticipated. Major milestones such as the LISA pathfinder mission are discussed. Furthermore, we outline the viable use of ZERODUR® for great observatory architectures for IR/O/UV spaceborne telescopes. The objective of this paper is to supplement an earlier review of the use of ZERODUR® for space applications in the past decade and to summarize the latest progress and results of material studies toward very efficient production capabilities for high-performance light-weighted mirror substrates. KW - mirror KW - space KW - glass ceramics KW - low thermal expansion KW - satellite KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1117/12.2628956 VL - 2022 IS - 12180 SP - 121805N-1 EP - 121805N-15 PB - SPIE ER -