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1. EP0998687 - IMPROVED ANTI-REFLECTIVE COMPOSITE

Office
European Patent Office
Application Number 98932780
Application Date 18.06.1998
Publication Number 0998687
Publication Date 10.05.2000
Publication Kind A1
IPC
C03C 17/34
CCHEMISTRY; METALLURGY
03GLASS; MINERAL OR SLAG WOOL
CCHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
17Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating
34with at least two coatings having different compositions
C23C 14/06
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
14Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
06characterised by the coating material
G02B 1/11
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
1Optical elements characterised by the material of which they are made; Optical coatings for optical elements
10Optical coatings produced by application to, or surface treatment of, optical elements
11Anti-reflection coatings
CPC
G02B 1/116
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
1Optical elements characterised by the material of which they are made
10Optical coatings produced by application to, or surface treatment of, optical elements
11Anti-reflection coatings
113using inorganic layer materials only
115Multilayers
116including electrically conducting layers
G02B 1/11
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
1Optical elements characterised by the material of which they are made
10Optical coatings produced by application to, or surface treatment of, optical elements
11Anti-reflection coatings
Applicants CPFILMS INC
Inventors SAIF MOHTASHIM
MEMARIAN HASSAN
Designated States
Priority Data 5382597 24.07.1997 US
5389197 28.07.1997 US
09085844 28.05.1998 US
9812707 18.06.1998 US
Title
(DE) VERBESSERTE ANTIREFLEKTIERENDE SCHICHT
(EN) IMPROVED ANTI-REFLECTIVE COMPOSITE
(FR) COMPOSITE ANTI-REFLETS AMELIORE
Abstract
(EN) An anti-reflective composite is provided having very high visible light transmission and negligible visible reflectance over 400 nm-800 nm wavelengths. The composite of the invention includes (a) a light transmissive substrate; (b) a hard coat deposited onto the substrate; (c) a thin carbon layer having an average thickness between about 2 Å and about 100 Å; and (d) a plurality of transparent oxide layer pairs deposited onto the thin carbon layer, each transparent oxide layer pair comprising (i) a first transparent oxide having a refractive index between about 1.65 and about 2.65 and an average thickness between about 100 Å and about 3200 Å and (ii) a second transparent oxide layer having a refractive index between about 1.2 and about 1.85, and an average thickness between about 100 Å and about 3200 Å. The composite can also include an intermediate oxide layer disposed between the thin carbon layer and the first transparent oxide layer. Such intermediate oxide layer has a refractive index between about 1.5 and about 2.2 and is between 400 Å and about 1000 Å in thickness. In another preferred embodiment, the composite further comprises an outermost transparent low surface energy layer having a surface energy of less than about 40 dynes/cm2. In another preferred embodiment, the transparent layers are deposited by vacuum or non-vacuum processes or by a combination of both processes.
(FR) Ce composite anti-reflets est doté d'un coefficient élevé de transmission de la lumière visible, mais d'une réflectance négligeable du visible sur des longueurs d'onde comprises entre 400 et 800 nanomètres. Ce composite est constitué, (a), d'un substrat transparent, (b), d'un revêtement dur déposé sur ce substrat, (c), d'une mince couche de carbone d'une épaisseur moyenne comprise entre 2 Å et 100 Å et, (d), de plusieurs paires de couches d'oxyde transparent déposées sur cette mince couche de carbone, chaque paire d'oxyde transparent comportant, (i), un premier oxyde transparent à indice de réfraction compris entre environ 1,65 et environ 2,65 et d'une épaisseur moyenne comprise entre environ 100 Å et environ 3200 Å et, (ii), un second oxyde transparent à indice de réfraction compris entre environ 1,2 et environ 1,85 et d'une épaisseur moyenne comprise entre environ 100 Å et environ 3200 Å. Ce composite est également susceptible de comporter une couche intermédiaire d'oxyde s'intercalant entre la mince couche de carbone et la première couche d'oxyde transparent. L'indice de réfraction de cette couche intermédiaire est compris entre environ 1,5 et environ 2,2 et l'épaisseur moyenne entre 400 Å et environ 1000 Å. Dans une autre réalisation préférée, ce composite peut, de surcroît, comporter une couche transparente extérieure à faible tension superficielle, inférieure, en l'occurrence, à environ 40 dyn/cm2. Dans une autre réalisation préférée, les couches transparentes sont déposées par procédé de dépôt sous vide ou en atmosphère ou bien au moyen d'une combinaison de ces deux procédés.