WO2024251706A1 - Composant horloger coloré - Google Patents
Composant horloger coloré Download PDFInfo
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- WO2024251706A1 WO2024251706A1 PCT/EP2024/065272 EP2024065272W WO2024251706A1 WO 2024251706 A1 WO2024251706 A1 WO 2024251706A1 EP 2024065272 W EP2024065272 W EP 2024065272W WO 2024251706 A1 WO2024251706 A1 WO 2024251706A1
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- WIPO (PCT)
- Prior art keywords
- layer
- layers
- coating
- deposition
- thickness
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/0015—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterized by the colour of the layer
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C27/00—Making jewellery or other personal adornments
- A44C27/001—Materials for manufacturing jewellery
- A44C27/005—Coating layers for jewellery
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/024—Deposition of sublayers, e.g. to promote adhesion of the coating
- C23C14/025—Metallic sublayers
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0676—Oxynitrides
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/54—Controlling or regulating the coating process
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/54—Controlling or regulating the coating process
- C23C14/542—Controlling the film thickness or evaporation rate
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
- C23C14/568—Transferring the substrates through a series of coating stations
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/006—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterized by the colour of the layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
- C23C16/0281—Deposition of sub-layers, e.g. to promote the adhesion of the main coating of metallic sub-layers
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/40—Coatings including alternating layers following a pattern, a periodic or defined repetition
- C23C28/42—Coatings including alternating layers following a pattern, a periodic or defined repetition characterized by the composition of the alternating layers
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/40—Coatings including alternating layers following a pattern, a periodic or defined repetition
- C23C28/44—Coatings including alternating layers following a pattern, a periodic or defined repetition characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness
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- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B19/00—Indicating the time by visual means
- G04B19/06—Dials
- G04B19/10—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial
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- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B45/00—Time pieces of which the indicating means or cases provoke special effects, e.g. aesthetic effects
- G04B45/0015—Light-, colour-, line- or spot-effects caused by or on stationary parts
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- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B45/00—Time pieces of which the indicating means or cases provoke special effects, e.g. aesthetic effects
- G04B45/0076—Decoration of the case and of parts thereof, e.g. as a method of manufacture thereof
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- G—PHYSICS
- G04—HOROLOGY
- G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
- G04B37/00—Cases
- G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
Definitions
- the invention relates to a watch component comprising a coating which forms an optical device for coloring or more generally decorating the watch component. It also relates to a timepiece comprising at least one such watch component. It also relates to a method for manufacturing such a watch component.
- the general object of the invention is to propose a solution for coloring a watch component which makes it possible to improve existing solutions.
- a first object of the invention is to propose a solution for coloring a watch component which makes it possible to achieve a predefined color in a durable, robust and repeatable manner.
- a second object of the invention is to propose a solution for coloring a watch component using a simple process compatible with industrial manufacturing.
- the invention is based on a watch component, in particular a watch exterior component, in particular a dial, characterized in that it comprises a body, one surface of which is at least partially covered with a coating forming an optical coloring device, characterized in that said coating comprises a stack of the following successive layers on said surface:
- top coat such as an acrylic and/or nitrocellulose top coat, including zapon;
- one or more layers of a metallic material in particular chromium or even titanium, intercalated between two of said layers of the coating defined above, such a layer promoting adhesion and/or partial absorption of light.
- the invention also relates to a method for manufacturing a watch component, in particular a watch exterior component, in particular a dial, comprising a prior step of manufacturing a body of the watch component, characterized in that it comprises the deposition of a coating on at least part of a surface of said body, this deposition of a coating comprising the following steps:
- top finishing layer such as an acrylic and/or nitrocellulose top coat, in particular zapon;
- a metallic material in particular chromium, or even titanium, intercalated between two of said layers of the coating defined above, such a layer of chromium and/or titanium having a very low thickness less than or equal to 2 nm to promote the adhesion of said two layers of coating or such a layer of chromium and/or titanium having a thickness greater than 2 nm to form a partial absorption layer.
- Figures 1a, 1b and 1c schematically represent sectional views of coatings for a component according to three variants of a first embodiment of the invention.
- Figures 2a and 2b schematically represent sectional views of coatings for a component according to two variants of a second embodiment of the invention.
- Figure 3 schematically represents a sectional view of a coating for a component according to a third embodiment of the invention.
- the lowest layer is the one intended to be applied directly in contact with the surface of the body of a watch component and the highest layer is the one that is oriented towards the outside, which forms the final external surface of the watch component.
- the aim of the invention is therefore to generate a chosen colour of a surface of a component.
- the invention is based on the use of a coating, comprising several superimposed particular thin layers, which together form an optical device whose effect is a colouring, i.e. the effect consists in modulating the behaviour in reflectivity of the light of a surface, so as to favour certain wavelengths over others.
- this effect is naturally to allow a user to perceive a predefined color and/or more generally a decorative effect.
- This effect therefore occurs in the visible range of light.
- We will subsequently call the visible range all visible wavelengths, or a significant portion of visible wavelengths.
- the expression visible range can for example subsequently designate a range of wavelengths between 380 and 780 nm, or even between 380 and 650 nm, or even between 380 and 550 nm.
- the term visible domain can thus incorrectly designate only a part of the theoretical visible domain.
- the optical effect according to the concept of the invention is obtained by a stack of thin layers with selected optical properties.
- the overall optical effect results from the different absorption, reflection and interference phenomena induced by the superimposed layers.
- the material chosen for each layer and the associated refractive index will make it possible to define the optical property sought by each layer and an overall optical effect resulting from the combination of the different layers.
- the refractive index is often a complex number, which is composed in a known manner of a real part n, which defines the deviation by an interface between two given layers of an incident light ray, and an imaginary part k, which defines an extinction coefficient, which accounts for the attenuation of the incident light wave.
- the invention is based on the use of a particular coating, which forms an optical coloring device, which is arranged on all or part of a surface of a body of a component to be colored.
- the invention is based on using a particular coating, comprising a first group comprising at least two reflective layers surrounding a layer of semiconductor material, and a second group comprising at least one oxide layer.
- the first group of the coating includes, in order from bottom to top:
- the first and third layers thus form reflective layers, i.e. their main effect is to reflect incident light.
- the first and third layers, or even the other optional reflective layers of the coating are characterized by the fact that they form a medium whose refractive index in the visible range comprises a real part less than 3.5 and an imaginary part, i.e. an extinction coefficient, greater than 1.
- This real part may have a maximum value (less than 3.5) in the visible range, and form a function of the wavelength initially increasing up to this maximum value, then decreasing, with the increase in the wavelength.
- the imaginary part may increase with the wavelength.
- these layers consist of one or more metallic materials.
- Each of these layers may be present entirely in a single metallic material, or even in a mixture of two or more metallic materials, arranged within the same layer or in a succession of superimposed layers.
- the metallic material(s) are chosen from gold, platinum, titanium, palladium, chromium, rhodium, silver, copper, tungsten, aluminum, the latter being able to be encapsulated by a very thin layer of Al2O3 deposited by an ALD process (acronym for Atomic Layer Deposition).
- ALD ALD process
- any metallic material can be used.
- each of the first and third layers is in the form of a metallic layer, entirely in a single metallic material, which can be the same for both layers or which can be different.
- the first layer has a thickness greater than or equal to 100 nm. It optically isolates the coating from the body. It also contributes more strongly to the overall optical rendering of the coating.
- This first layer is thicker than the other layers of the coating, and can act as a substrate, while being within the coating. Alternatively, this first layer can be formed by the body.
- the third layer has a thickness of between 2 and 50 nm, or even between 5 and 50 nm, or even between 30 and 40 nm, and/or a thickness greater than or equal to 20 nm.
- the third layer can be chosen from:
- a layer of gold with a thickness of between 5 and 50 nm, or even between 30 and 40 nm, and/or with a thickness greater than or equal to 20 nm, or
- a layer of platinum or titanium or palladium or chromium or rhodium or silver between 5 and 50 nm, or even between 30 and 40 nm, and/or of thickness greater than or equal to 20 nm, or
- a layer comprising gold and/or platinum and/or titanium and/or palladium and/or chromium and/or rhodium and/or silver included between 5 and 50 nm, or even between 30 and 40 nm, and/or with a thickness greater than or equal to 20 nm.
- gold is used as a metal layer for the first and/or third layer, possibly combined with chromium as will be detailed later.
- gold is a material that is easy to deposit, robust, and shows good reproducibility from one manufacturing cycle to another.
- the second layer of semiconductor material is characterized by the fact that it forms a medium whose refractive index in the visible range comprises a real part greater than 2.5 and an imaginary part, i.e. an extinction coefficient, greater than 0.05.
- This real part may have a maximum value (greater than 2.5) in the visible range, and form a function of the wavelength initially increasing up to this maximum value, then decreasing, with the increase in the wavelength.
- the imaginary part may decrease with the wavelength.
- the extinction coefficient is in particular greater than 0.05 for wavelengths less than 550 nm, or even for wavelengths between 380 and 550 nm, or even between 380 and 650 nm, or even between 380 and 780 nm.
- the second layer is based on one or more semiconductor materials. It can be present entirely in a single semiconductor material, or even in a mixture of two semiconductor materials, arranged within the same layer or in two superimposed sub-layers.
- the semiconductor material(s) are chosen from silicon Si, germanium Ge, a combination of silicon Si and germanium Ge, a semiconductor material of the III-V families such as gallium arsenide GaAs, tantalum oxynitride (TaOxNy).
- the latter material can be alternatively insulating, semiconducting or electrically conductive, depending on its degree of nitriding and oxidation, respectively characterized by the values of y and x.
- the second layer has a thickness of between 5 and 50 nm.
- the use of silicon, and more generally of a semiconductor material, offers several advantages.
- the optical behavior of the second layer varies little with the angle of incidence, which is not the case for example with silicon oxide.
- the refractive index of semiconductor materials being generally high (real part greater than 2.5, or even 3, in the visible range), the trajectory of the light rays is naturally brought back towards the vertical when they penetrate the material.
- the non-zero imaginary part of the refractive index of these materials implies an important role of the interfaces in the phenomenon of optical interference. This makes it possible in particular to greatly limit the iridescence of the color obtained.
- the semiconductor material used is unoxidized, and at least not intentionally oxidized. Likewise, this semiconductor material is unintentionally amorphous, and not hydrogenated.
- this first group of coating comprising the use of two metal layers surrounding a layer of semi-conductor material, is advantageous because it allows the amount of transmitted and reflected light, and in particular the intensity of light that interacts with the layer of semiconductor material.
- the thickness of the third metal layer can be chosen so as to decouple the layer of semiconductor material of the second group from the coating. Indeed, even for a relatively transparent metal such as gold in small thicknesses, a thickness of approximately 20 nm is already sufficient to attenuate the electromagnetic radiation significantly. The third layer thus makes it possible to determine the quantity of light that reaches the layer of semiconductor material.
- this combination of the said first group has very advantageous properties, which allow a modulation of the optical properties over the entire visible range in a flexible, robust, reproducible way, without iridescence. The result cannot be obtained from the layers taken individually.
- This first group can thus be based on a multitude of combinations of materials, including Au(substrate)/Si/Au, Au(substrate)/Si/Ag, Ag(substrate)/Si/Au, Rh(substrate)/Si/Au, (Rh/Au)(substrate)/Si/Au, Cr(substrate)/Si/Au, etc.
- this structure of the first group can be modified to incorporate one or more layers of chromium Cr, or more generally of metal, in particular intercalated between two of the three layers described above.
- chromium Cr or more generally of metal, in particular intercalated between two of the three layers described above.
- Such a layer of chromium can fulfill two different functions.
- any metal can be used as a replacement for chromium depending on the desired effect, such as titanium Ti which can fulfil the functions of adhesion layer and/or partial absorption.
- the first group of the coating can thus have a structure enriched by the presence of one or more layers of metal, such as chromium.
- Its structure can thus, for example, consist of combinations such as Au(substrate)/Si/Cr-Au-Cr, Au(substrate)/Si/Au-Cr, Au(substrate)/Si/Cr- Au, Au(substrate)-Cr/Si/Au, Au(substrate)-Cr/Si/Cr-Au, Au(substrate)- Cr/Si/Cr-Au-Cr, Au(substrate)-Cr/Si/Au-Cr, or even Au(substrate)/Si/Cr, the chromium layer here forming the aforementioned third layer.
- the structure formed by the first group could be repeated, that is to say that the first group could comprise the additional superposition of a layer of semiconductor material and a reflective layer, according to a structure alternating a layer of semiconductor material and a reflective layer, in which each layer of semiconductor material is intercalated between two reflective layers.
- the coating comprises a second group, positioned on the first group described above.
- This second group comprises at least one oxide layer. This second group makes it possible in particular to modulate the reflectivity of the coating, and for example to increase the perceived clarity of the surface.
- the refractive index in the visible range of each of this or these oxide layers preferably comprises a real part less than 3 and an imaginary part less than 0.05, or even less than 0.01.
- said one or more layers of oxides of this second group comprises two layers respectively made of two different materials, the refractive indices of which are different.
- each of the oxide layers of this second group consists of or is based on a material chosen from SiO2, TiO2, ALOs, SisN4, Ta2Os, TaOxNy, AlOxNy, TiOxNy.
- the stoichiometry will be chosen so that the material has optical properties similar to those of the other oxides.
- the second group consists of:
- a layer of silicon oxide SiO2 with a thickness of between 20 and 140 nm, preferably between 40 and 75 nm, and/or
- the thicknesses of the oxide layers are minimized, low, in order to minimize the iridescence that they cause and to have good industrial robustness.
- This second group in addition to participating in the definition of the optical properties of the coating, also makes it possible to form a protective layer for the coating, and thus to increase the environmental robustness of the stack of layers of the coating.
- the second group optionally comprises a top finishing layer, such as an acrylic and/or nitrocellulose layer, in particular zapon, which is therefore positioned on the oxide layer(s).
- this finishing layer may comprise another material, such as a sol-gel material.
- This finishing layer may also comprise functional compounds such as a dye or diffusing particles.
- a finishing layer such as an acrylic and/or nitrocellulose layer, in particular zapon, it is advantageous to deposit a final layer of metal, in particular chromium, with a thickness of less than 2 nm, and preferably greater than 0.5 nm, on the last layer of oxides, i.e. the highest, to form an adhesion layer for the finishing layer.
- the second group preferably does not include a metal layer producing an optical effect. Only a thin metal layer, for example of chromium and/or titanium, with a thickness of less than 2 nm, can be used, for its function of reinforcing the adhesion between layers.
- a metal layer for example of chromium and/or titanium, with a thickness of less than 2 nm, can be used, for its function of reinforcing the adhesion between layers.
- some parts of the stack forming the coating can be split to modulate or reinforce their effect.
- the thicknesses of the layers can be different for the same material, for example the thickness of the first Si layer can be different from that of the second Si layer.
- the second Si layer can have a different residual oxidation state than the first.
- the second group of layers it is possible to split the second group of layers, and therefore to have for example a TiO2/SiO2/TiO2/SiO2 stack instead of TiCk/SiCk, or even a SiO2/TiO2/SiO2/TiO2/Zapon stack instead of SiCk/TiCk/Zapon.
- the coating according to the invention allows numerous combinations of layers, which makes it possible to obtain a wide range of colours and renderings, in particular colours in red, purple, blue, green or even brown tones.
- the table below gives some examples of layers made, with the colors obtained.
- the brightness L* and the chromatic values a* and b* are evaluated in the space defined by the International Commission on Illumination, CIE L*a*b*, as indicated in the “Technical Report of Colorimetry” CIE 15: 2004.
- the measurements are made in SCI (Specular Component Included) and SCE (Specular Component Excluded) mode and are presented below in SCI mode.
- Black can be defined as colors having coordinates L*a*b* such that -2 ⁇ a* ⁇ 2 and -2 ⁇ b* ⁇ 2 and L* ⁇ 30.
- Figures 1a to 1c schematically represent variants of a first embodiment of a coating according to the invention.
- the first group of the coating comprises the same structure of two layers of gold surrounding a layer of silicon.
- the first two variants comprise a second group composed of two oxide layers, respectively of silicon dioxide SiO2 and titanium dioxide TiO2, the order of which is reversed for the second variant.
- the third variant of Figure 1c has the same stack as the first variant of Figure 1a on which a finishing layer of zapon is added.
- Figures 2a and 2b schematically represent variants of a second embodiment of a coating according to the invention.
- the first group of the coating comprises a structure of two layers of gold surrounding a layer of silicon.
- the second group comprises an oxide layer, in this case titanium dioxide TiO2, on which a finishing layer of zapon is added.
- Figure 2b represents an alternative embodiment of that of Figure 2a, in which a thin layer of chromium is intercalated between each pair of adjacent successive layers of the embodiment of Figure 2a, to increase the adhesion between these layers.
- Figure 3 finally schematically represents a third embodiment of a coating according to the invention.
- the first group integrates three relatively thick layers of chrome, respectively arranged on each of the three base layers of the first group, to provide an optical complement to the first group.
- the first layer forming the substrate comprises a thick gold layer completed by the superposition of a chromium layer, and the third gold layer is completed by its positioning between two chromium layers.
- the second group is identical to that of the embodiment according to figure 1c.
- the surface to be decorated of the component may comprise a surface structuring, entirely or partly covered by the coating described above.
- This coating has a total thickness that is sufficiently low to match and preserve the reliefs of the surface structuring.
- a surface structuring may consist, for example, of sunburst, sandblasting, satin finishing, brushing, snailing, at least one Côte de Genève, pearling, hooping, and/or any type of decoration with repeated patterns.
- the body may be made of many materials, and in particular may be made of brass, gold, ceramic, in particular zirconia or alumina, sapphire, silicon, nickel Ni, or nickel-phosphorus NiP. It may be a body entirely made of the same material, or comprising several materials.
- the surface to be colored of the body may comprise a layer of material, for example to facilitate the production of a surface structuring as mentioned above in its thickness. Such a layer may for example be made of silver.
- the component may be a watch component, for example a watch component for display such as a dial, a bezel, a bezel disc, a crystal, a case, a bracelet, or a component of watch movement, such as a weight or a blank or a bridge or a barrel cover or a pawl cover.
- a watch component for display such as a dial, a bezel, a bezel disc, a crystal, a case, a bracelet, or a component of watch movement, such as a weight or a blank or a bridge or a barrel cover or a pawl cover.
- the invention also relates to a method for manufacturing a watch component, in particular a watch exterior component, in particular a dial, comprising a prior step of manufacturing a body of the watch component, characterized in that it comprises the deposition of a coating on at least part of a surface of said body, this deposition of a coating comprising the following steps:
- top finishing layer such as an acrylic and/or nitrocellulose layer, in particular zapon
- a metallic material in particular chromium, or even titanium
- a layer of chromium having a very low thickness less than or equal to 2 nm to promote the adhesion of said two layers of coating or such a layer of chromium having a thickness greater than 2 nm to form a partial absorption layer.
- the deposition of the different layers by the above-mentioned steps is carried out in the order indicated, the different layers being superimposed on each other, starting from the surface of the body of the component. These layers are therefore superimposed and adjacent, arranged according to the order indicated, with the exception of any intermediate layers of metal, in particular chrome, which may be intercalated between these different layers, depending on the optional deposit mentioned.
- all or part of the layers of the coating are deposited by physical vapor deposition PVD, for example by vacuum evaporation or sputtering or by ion beam, by chemical vapor deposition CVD, or by atomic layer deposition ALD.
- all the layers of the coating could be deposited by the same technique in the same manufacturing cycle, apart from a possible top finishing layer such as an acrylic and/or nitrocellulose finishing layer, in particular zapon. These deposits are preferably made without air exposure between the deposition of two successive layers.
- PVD physical vapor deposition
- CVD chemical vapor deposition
- ALD atomic layer deposition
- vacuum evaporation is used, which allows the deposit of thin layers of the elements Si, Cr, Au, TiO2 and SiO2 of very well-controlled thickness.
- the semiconductor layer is then made of Si, the metal layers of Au, and possibly Cr, the optional adhesion layers of Cr and the oxide layers of TiO2 and SiO2.
- sputtering is used, which also allows the deposit of thin layers of the elements Si, Cr, Au, TiO2 and SiO2. of very well controlled thickness.
- the semiconductor layer is then in Si, the metallic layers in Au, and possibly Cr, the optional adhesion layers in Cr and the oxide layers in TiCb and SiO2.
- sputtering is used, which allows the deposit of thin layers of TaOxNy, Cr, and Au of very well-controlled thickness.
- the semiconductor layer is then made of TaOxNy, the metal layers of Au, and possibly Cr, the optional adhesion layers of Cr and the upper layers of TaOxNy.
- Ar can be projected onto the components during deposition, which densifies the layers, according to the ion beam assisted PVD technique.
- the same ion beam can also be supplied with O2 or N2 to promote respectively the oxidation and/or nitriding of the coating.
- the characteristics of the deposited layers can be observed during deposition in a known manner.
- a quartz microbalance placed within the deposition chamber allows the thickness deposited to be monitored with great precision.
- it is possible to perform an analysis of the optical transmission or optical reflection of the deposited layer during deposition which makes it possible to target an optical property target and not a thickness target.
- the chambers of the deposition machines are placed under vacuum during the deposition cycles.
- the residual atmosphere invariably contains residual gases such as O2 or H2O or N2, which means that a certain degree of oxidation and/or partial nitriding of the layers is possible, unintentionally.
- This unintentional phenomenon can be minimized or even eliminated by preparing the deposition machine appropriately, in particular by cleaning it.
- This partial oxidation and/or nitriding is likely to have an influence on the optical properties and therefore potentially on the overall rendering of the deposited coating. If necessary, it is possible to adapt the thicknesses of the layers, to compensate for and erase this unintentional optical effect, and to obtain the correct rendering.
- the Si semiconductor material deposited according to the invention has an optical behavior close to that of pure, non-oxidized Si. Indeed, refractive index measurements in a “clean” machine (long pumping time), with a low residual oxygen partial pressure, give a refractive index n of 4.04 for an incident wavelength of 550 nm and 3.87 for an incident wavelength of 630 nm, which is very close to the values for pure silicon (4.39 for amorphous silicon and 4.08 for crystalline silicon at 630 nm).
- the refractive index measurements are 3.35 for an incident wavelength of 550 nm and 3.20 for an incident wavelength of 630 nm, which is lower but still very far from the value of 1.47 for silicon dioxide SiO2.
- the extinction coefficients k remain very high, and very clearly greater than 0.05 over a large part of the visible part of the spectrum.
- the Si-based material deposited by the process of the invention therefore always behaves like a semiconductor, regardless of the state of the deposition machine and the possible natural, unintentional oxidation phenomenon.
- the preceding considerations show that it is therefore possible to implement the invention as described based on a coating comprising a first group with a second layer of semiconducting material.
- This semiconducting material can have a oxidation, including unintentional oxidation, which is either negligible or compensated for by adapting the thicknesses of the coating layers, in order to obtain the desired result, including the desired color.
- the invention has the advantage of simplifying the manufacturing process, in particular by using a second layer of semiconductor material.
- the semiconductor material provides advantageous optical properties: in fact, the semiconductor material has a high refractive index, is partially absorbent (extinction coefficient k > 0.05 over a large part of the visible range), and is robust (it allows industrial and reproducible deposition, stable over time).
- the invention has many other advantages. Beyond the reflection spectrum obtained, the durability of the stack, i.e. the consistency of the rendering over time, or its manufacturing robustness (reproducibility from one manufacturing batch to another, number of layers if possible low and thin thicknesses, deposition techniques if possible compatible, or even unique for the entire stack) will be just as important.
- ⁇ Many possible colors on the same base, due to the multitude of influential parameters; ⁇ Obtaining a rendering target, in particular a color, for example a color according to the CIE L*a*b* reference, in particular a color different from black, or a color outside the domain defined by -2 ⁇ a* ⁇ 2 and -2 ⁇ b* ⁇ 2 and L* ⁇ 30;
- an ultra-thin metal layer with a thickness of less than 2 nm, in particular a layer of chromium or titanium, at at least one of the interfaces between two layers of a coating, to promote adhesion between said two layers.
- Such a characteristic can be generalized to any finishing layer to be deposited on any coating on the surface of a component.
- the invention also relates to a watch component, in particular a watch component for display, in particular a dial, characterized in that it comprises a body, one surface of which is covered at least partially of a coating, characterized in that said coating comprises a finishing layer such as an acrylic and/or nitrocellulose finishing layer, in particular zapon, and an intermediate layer on which this finishing layer is deposited, made of metallic material, in particular chromium, or even titanium, with a thickness of less than 2 nm, to promote the adhesion of said finishing layer.
- a finishing layer such as an acrylic and/or nitrocellulose finishing layer, in particular zapon
- an intermediate layer on which this finishing layer is deposited made of metallic material, in particular chromium, or even titanium, with a thickness of less than 2 nm, to promote the adhesion of said finishing layer.
- the invention also relates to a method for manufacturing a watch component, in particular a watch exterior component, in particular a dial, comprising a prior step of manufacturing a body of the watch component, characterized in that it comprises the deposition of a coating on at least part of a surface of said body, this deposition of a coating comprising the following steps:
- a layer of a metallic material in particular chromium or even titanium, with a thickness less than or equal to 2 nm
- finishing layer such as an acrylic and/or nitrocellulose finishing layer, in particular zapon, directly on said layer of a metallic material, such that this finishing layer has improved adhesion by said layer of a metallic material.
- the coating comprises a second group arranged on a first group as described, this second group comprising one or more layers of semiconductor material, such as for example a layer of TaOxNy.
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Abstract
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480037741.9A CN121263546A (zh) | 2023-06-05 | 2024-06-04 | 彩色钟表部件 |
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| Application Number | Priority Date | Filing Date | Title |
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| EP23177178 | 2023-06-05 | ||
| EP23177178.3 | 2023-06-05 |
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| WO2024251706A1 true WO2024251706A1 (fr) | 2024-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/065272 Pending WO2024251706A1 (fr) | 2023-06-05 | 2024-06-04 | Composant horloger coloré |
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| WO (1) | WO2024251706A1 (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2664259A1 (fr) * | 1990-07-05 | 1992-01-10 | Saint Gobain Vitrage Int | Procede pour former une couche d'oxydes d'aluminium et de titane sur du verre, produit obtenu et son utilisation comme verre de couleur neutre en reflexion. |
| EP2392689A1 (fr) * | 2010-06-04 | 2011-12-07 | Positive Coating SA | Article décoratif avec revêtement rouge et procédé |
| US20200224318A1 (en) * | 2019-01-11 | 2020-07-16 | Frederick Goldman, Inc. | Black diamond like carbon (dlc) coated articles and methods of making the same |
| EP3896193A1 (fr) | 2020-04-16 | 2021-10-20 | Richemont International S.A. | Composant horloger avec un système optique interférentiel amélioré et son procédé de fabrication |
| EP4060386A1 (fr) | 2021-03-18 | 2022-09-21 | Omega SA | Pièce d'habillage d'horlogerie ou de bijouterie comprenant un revêtement de couleur interférentielle et procédé de fabrication de ladite pièce |
-
2024
- 2024-06-04 WO PCT/EP2024/065272 patent/WO2024251706A1/fr active Pending
- 2024-06-04 CN CN202480037741.9A patent/CN121263546A/zh active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2664259A1 (fr) * | 1990-07-05 | 1992-01-10 | Saint Gobain Vitrage Int | Procede pour former une couche d'oxydes d'aluminium et de titane sur du verre, produit obtenu et son utilisation comme verre de couleur neutre en reflexion. |
| EP2392689A1 (fr) * | 2010-06-04 | 2011-12-07 | Positive Coating SA | Article décoratif avec revêtement rouge et procédé |
| US20200224318A1 (en) * | 2019-01-11 | 2020-07-16 | Frederick Goldman, Inc. | Black diamond like carbon (dlc) coated articles and methods of making the same |
| EP3896193A1 (fr) | 2020-04-16 | 2021-10-20 | Richemont International S.A. | Composant horloger avec un système optique interférentiel amélioré et son procédé de fabrication |
| EP4060386A1 (fr) | 2021-03-18 | 2022-09-21 | Omega SA | Pièce d'habillage d'horlogerie ou de bijouterie comprenant un revêtement de couleur interférentielle et procédé de fabrication de ladite pièce |
| US20220299689A1 (en) * | 2021-03-18 | 2022-09-22 | Omega Sa | External part for a timepiece or a piece of jewellery comprising an interferential colour coating and manufacturing method of said part |
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| CN121263546A (zh) | 2026-01-02 |
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