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The invention relates to a lead-containing space glass, its production and its use. The optical glasses have increased refractive indices and are useful for making space-saving and light-weight imaging optics with lenses of different glass types for use in different objects travelling in space. The optical glasses are suitable for production of optics having low total weight, which is decisive for space applications. These space glasses have high UV- and VIS-transmittance in a range of between 300 and 800 nm and high stability of transmittance over a period of years, because their aging has been greatly limited.
OPTICAL COMPONENT
(2012)
To provide an optically uniform quality component which is a large size optical transparency component such as a lenz, prism, mirror or the like. ;SOLUTION: The optical component comprises an optical glass which comprises 35 to 70 wt.% SiO2, 17 to 35 wt.% Al2O3, 3 to 17 wt.% P2O5, 0 to 6 wt.% Li2O, 0.5 to 4 wt.% MgO, 0.5 to 3 wt.% ZnO, a maximum of 1 wt.% CaO, a maximum of 0.5 wt.% BaO, 0.5 to 6 wt.% TiO2, 0.5 to 3 wt.% ZrO2, 0 to 1 wt.% Na2O, 0 to 1 wt.% K2O, a maximum of 2 wt.% of refining agents, and a maximum of 1 wt.% of a coloring oxide and other impurities, and has at least 50 mm maximum thickness.
The optical glasses have increased refractive indices and are useful for making space-saving and light-weight imaging optics with lenses of different glass types for use in different objects travelling in space. The optical glasses are suitable for production of optics having low total weight, which is decisive for space applications. These space glasses have high UV- and VIS-transmittance in a range of between 300 and 800 nm and high stability of transmittance over a period of years, because their aging has been greatly limited.
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.
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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.
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.
The space glasses have a composition, in wt. % based on oxide content, including SiO2, 12-45; B2O3, 0-4; Al2O3, 0-4; TiO2, 0-5; PbO, 50-82; Na2O, 0-4; K2O, 0-8; and at least 0.1 wt. % of a total amount of at least three doping agents selected from CeO2, MoO3, Bi2O3, WO3, Ag2O, SnO2, Sb2O3 and As2O3. Light-weight and space-saving optical systems for outer space applications can be made with these space glasses, which have high UV- and VIS-transmittance and high transmittance stability, because of their high radiation resistance based on their dopant content. A preferred process for making the space glass includes melting the above-stated oxide ingredients in a quartz crucible at 1050 DEG C. to 1200 DEG C. to form a melt and refining the melt at 1230 DEG C. to 1350 DEG C.
The space glass has a composition, in wt. % based on oxide content, of: SiO2, 5-65; B2O3, 0-40; Al2O3, 0-12; PbO, 25-50; Na2O 0-8; K2O, 0-20; Sigma alkali metal oxides, at least 0.25; and at least 0.1 wt. % of a total amount of three or more doping agents selected from CeO2, MoO3, Bi2O3, WO3, Ag2O, SnO2, Sb2O3 and As2O3. In addition, it contains one or more of the following doping agents in the following amounts: at most 1 wt. %, CeO2; at most 0.02 wt. %, As2O3; at most 0.3 wt. %, Sb2O3; and at most 0.5 wt. %, SnO2. Light-weight optical systems for space are made from it, because of its high radiation resistance. A preferred process for making space glass includes melting the oxide starting ingredients at 1050 DEG C. to 1200 DEG C. to form a melt and refining the melt at 1230 DEG C. to 1350 DEG C.
The optical glasses have increased refractive indices and are useful for making space-saving and light-weight imaging optics with lenses of different glass types for use in different objects travelling in space. The optical glasses are suitable for production of optics having low total weight, which is decisive for space applications. These space glasses have high UV- and VIS-transmittance in a range of between 300 and 800 nm and high stability of transmittance over a period of years, because their aging has been greatly limited.