US 12,334,860 B2
Facade elements with patterned cover plate and optical interference layer
Joerg Palm, Munich (DE); and Lutz Tautenhahn, Dresden (DE)
Assigned to CNBM RESEARCH INSTITUTE FOR ADVANCED GLASS MATERIALS GROUP CO., LTD., Bengbu (CN)
Appl. No. 17/263,129
Filed by CNBM RESEARCH INSTITUTE FOR ADVANCED GLASS MATERIALS GROUP CO., LTD., Bengbu (CN)
PCT Filed Jul. 16, 2019, PCT No. PCT/CN2019/096167
§ 371(c)(1), (2) Date Jan. 25, 2021,
PCT Pub. No. WO2020/020016, PCT Pub. Date Jan. 30, 2020.
Claims priority of application No. 18186175 (EP), filed on Jul. 27, 2018.
Prior Publication US 2021/0184624 A1, Jun. 17, 2021
Int. Cl. H10F 77/70 (2025.01); H02S 20/26 (2014.01); H10F 19/85 (2025.01); H10F 77/30 (2025.01); H10F 77/42 (2025.01)
CPC H02S 20/26 (2014.12) [H10F 19/85 (2025.01); H10F 77/315 (2025.01); H10F 77/488 (2025.01); H10F 77/707 (2025.01)] 18 Claims
OG exemplary drawing
 
1. A passive facade element, comprising:
a transparent cover plate and an opaque black back element mounted on the cover plate, the cover plate having an outer surface facing an external environment and an inner surface facing the opaque black back element, wherein the opaque black back element covers at least 90% of the transparent cover plate and is configured such that less than 5% of total visible light received by the opaque black back element from the transparent cover plate is transmitted by the opaque black back element,
wherein
i) the outer surface has at least one patterned region, on which an optical interference layer for reflecting light within a predefined wavelength range is arranged,
ii) an optical interference layer for reflecting light within a predefined wavelength range is arranged on the inner surface, the inner surface and/or the outer surface having at least one patterned region, wherein either
a) the outer surface has at least one patterned region, or
b) another optical interference layer for reflecting light within a predefined wavelength range is arranged on the outer surface, or
iii) an optical interference layer for reflecting light within a predefined wavelength range is arranged on the inner surface, the inner surface having at least one patterned region and the outer surface having no patterned region, wherein no optical interference layer is arranged on the outer surface; and
each of the at least one patterned region has the following features:
perpendicularly to a plane of the cover plate, a height profile with hills and valleys, wherein a mean height difference between the hills and valleys is at least 2 μm,
at least 50% of the patterned region is composed of segments that are inclined relative to the plane of the cover plate, wherein, with reference to the plane of the cover plate, at least 20% of the segments have an inclination angle in a range from greater than 0° to 15°, at least 30% of the segments have an inclination angle in a range from greater than 15° to 45°, and greater than 0% but less than 30% of the segments have an inclination angle greater than 45°; and
the segments are flat and have a segment area of at least 1 um2, the segments having each a mean roughness of less than 15% of a layer thickness of the optical interference layer on the outer surface; and
wherein the at least one patterned region, the optical interference layer, and the opaque black back element together mimic a colored solar module and deliver a same color impression under various light conditions as the colored solar module.