| CPC G02B 1/10 (2013.01) [G02B 5/226 (2013.01)] | 15 Claims |
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1. A laminated glazing comprising two transparent substrates, between which an adhesive interlayer is inserted, wherein a first transparent substrate of the two transparent substrates is coated on one face with a stack of thin layers forming a functional coating which is adapted to act on solar radiation and/or infrared radiation, said functional coating comprising two metallic functional layers, each arranged between two dielectric coatings, so as to comprise, starting from the first transparent substrate, a following sequence of layers and coatings:
first dielectric coating Di1/first metallic functional layer F1/second dielectric coating Di2/second metallic functional layer F2/third dielectric coating Di3,
each of the first dielectric coating Di1, second dielectric coating Di2 and third dielectric coating Di3 comprising at least one layer of dielectric material,
wherein:
the second dielectric coating Di2 located between the first and second metallic functional layers F1, F2 comprises at least one absorbent layer which absorbs solar radiation in the visible part of the spectrum,
the at least one absorbent layer is surrounded, and in contact, on one side or on both sides, with a layer of dielectric material,
a ratio of optical thickness of all dielectric layers located between the second metallic functional layer F2 and the at least one absorbent layer to an optical thickness of all dielectric layers located between the first functional metal layer F1 and the at least one absorbent layer is between 0.5 and 1.5,
the first and second metallic functional layers F1, F2 have a ratio of thickness of the second metallic functional layer F2 to the first metallic functional layer F1 of between 0.7 and 1.5;
the first and third dielectric coatings Di1, Di3 have a ratio of optical thickness of the third dielectric coating Di3 to the first dielectric coating Di1 of between 0.7 and 1.5,
the optical thickness of each of the first dielectric coating Di1 and the third dielectric coating Di3 is between 50 and 100 nm,
each of the second dielectric coating Di2 and third dielectric coating Di3 comprises a dielectric layer based on silicon nitride,
the first dielectric coating Di1 comprises a first dielectric layer based on silicon nitride and a second dielectric layer based on an oxide arranged between the first dielectric layer based on silicon nitride and the first metallic functional layer,
a light transmission (TL) of the laminated glazing is less than 40% when it is measured with the two transparent substrates that are each 4 mm-thick clear glass and the adhesive interlayer comprises polyvinyl butyral (PVB) and is in a configuration: 4 mm-thick clear glass/stack/PVB/4 mm-thick clear glass, and
the at least one absorbent layer is based on:
metal,
nitride selected from the list comprising NbN, TiN, ZrN, TiZrN, or
oxynitride selected from the list comprising TiNO, NbNO,
or mixtures thereof.
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