US 12,492,143 B2
Composite workpiece, method of manufacturing, device and use of such a composite workpiece
Thorsten Damm, Eltville am Rhein (DE); Clemens Ottermann, Hattersheim (DE); and Jens Herrmann, Selzen (DE)
Assigned to Schott AG, Mainz (DE)
Filed by Schott AG, Mainz (DE)
Filed on Dec. 8, 2021, as Appl. No. 17/545,547.
Claims priority of application No. 10 2020 132 708.0 (DE), filed on Dec. 8, 2020.
Prior Publication US 2022/0177362 A1, Jun. 9, 2022
Int. Cl. C03C 17/34 (2006.01); B32B 17/06 (2006.01); G02B 1/11 (2015.01); G02B 1/113 (2015.01); G02B 1/115 (2015.01); G02B 27/01 (2006.01)
CPC C03C 17/3411 (2013.01) [G02B 1/115 (2013.01); G02B 27/0172 (2013.01); C03C 2217/734 (2013.01); C03C 2218/154 (2013.01); G02B 2027/0178 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A composite workpiece, comprising:
a substrate body comprising at least one first surface and at least one second surface, the at least one first surface of the substrate body being shaped convexly at least in areas and the at least one second surface of the substrate body being shaped concavely at least in areas, and the composite workpiece has a bow with an absolute value of between 0.1 μm and 50 μm due to the curved shape of the at least one first surface and the at least one second surface; and
a first coating, the at least one first surface of the substrate body being coated at least in areas with the first coating, wherein for a Young's modulus of a material of the substrate body (E), a Poisson's ratio of the material of the substrate body (v), a radius of curvature of the composite workpiece (R), a thickness of the substrate body (D), a thickness of the first coating (d), and for a compressive stress in the first coating(S), the relation

OG Complex Work Unit Math
 is satisfied.