External part comprising a stack of protective interference layers
AssigneeThe Swatch Group Research and Development Ltd
InventorsCamille HALLER, Loïc Curchod, Mina Moradi, Marie Baudoz, Giovanni Poly
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Abstract
An external part (10) for use in horology, jewellery or fine jewellery, including a substrate (100) having a metallic face (101) made of a noble metal or of a noble metal alloy in which the complex refractive index at a wavelength of 550 nm has a real part n<1 and an imaginary part 2<k<3, on which is deposited a stack of thin-film dielectric coatings (110), each consisting of a thin atomic film, formed by at least one alternation of layers made of TiO2 and Al2O3 and comprising a terminal layer (111) made of TiO2 and a base layer (112) resting on the metallic face (101) made of TiO2 or of Al2O3.
Claims9
An external part for use in horology, jewellery or fine jewellery, comprising a substrate having a metallic face made of a noble metal or of a noble metal alloy in which the complex refractive index at a wavelength of 550 nm has a real part n<1 and an imaginary part 2<k<3, on which is deposited a stack of thin-film dielectric coatings, each including a thin atomic film, formed by at least one alternation of layers made of TiO2 and Al2O3 and comprising a terminal layer made of TiO2 and a base layer resting on the metallic face made of TiO2 or of Al2O3.
Dependencies are inferred from the claim text.