Timepiece assembly

Abstract

The invention discloses a timepiece component comprising a substrate (6) and at least one first decorative component (1) comprising at least one first photoluminescent material intended to obtain a phosphorescent appearance. The timepiece component comprises a second decorative component (3) comprising at least one second material which is metal-containing and intended to obtain a metallic appearance, or which is color-changing and intended to obtain a color that changes under the action of a stimulus. The first decorative component (1) and the second decorative component (3) are arranged relative to each other on a substrate (6) to form a decoration having a metallic appearance or a color that changes under the action of a stimulus when the timepiece component is exposed to light and a phosphorescent appearance when the timepiece component is in the dark. The invention also relates to a timepiece comprising such a timepiece assembly.

Description

[0001] This patent application is a divisional application of the patent application with the same title, with application number 202011011457.4 and application date September 23, 2020. Technical Field

[0002] The invention relates to a timepiece component comprising a substrate and at least one first decorative component comprising at least one first photoluminescent material intended to obtain a phosphorescent appearance when the component is in the dark. The invention also relates to a timepiece comprising such a component. Background Art Such photoluminescent materials are known, for example, for making coatings intended to cover the hands or regulator hands of a watch so that they glow and are visible in the dark.

[0004] Swiss patent document CH 697210 describes a dial comprising a translucent layer, the back of which contains hollows filled with phosphorescent pigments to allow a decoration visible in the dark to appear beneath the translucent layer.

[0005] However, although the decorations containing phosphorescent pigments used on timepiece components are intended to be imperceptible when the decorated components are exposed to daylight, these decorations still show up, especially in the eyes of informed professionals. Phosphorescent decorations that show up in daylight thus detract from the aesthetics of the timepiece, which is unacceptable, especially for high-end timepieces. Summary of the invention The object of the present invention is to overcome these drawbacks by proposing a horological component comprising a photoluminescent material intended to obtain a phosphorescent appearance in the dark, which hides itself when the component is exposed to light, thus improving its aesthetic appearance.

[0007] To this end, the invention relates to a timepiece component comprising a substrate and at least one first decorative component comprising at least one first photoluminescent material intended to obtain a phosphorescent appearance.

[0008] According to the invention, the timepiece component comprises a second decorative component comprising at least one second material which is metal-containing and intended to obtain a metallic appearance, or is color-changing and intended to obtain a color that changes under the effect of a stimulus, the first decorative component and the second decorative component being arranged relative to each other on a substrate so as to form a decoration having a metallic appearance or a color that changes under the effect of a stimulus when the component is exposed to light and having a phosphorescent appearance when the component is in the dark.

[0009] The invention provides a timepiece component comprising a substrate (6) and at least one first decorative component (1), the first decorative component (1) comprising at least one first photoluminescent material intended to obtain a phosphorescent appearance, characterised in that the timepiece component comprises a second decorative component (3), the second decorative component (3) comprising at least one second material, the second material being metal-containing and intended to obtain a metallic appearance, or being colour-changing and intended to obtain a colour that changes under the effect of a stimulus, the first decorative component (1) and the second decorative component (3) being arranged relative to each other on the substrate (6) so as to form a decoration having a metallic appearance when the timepiece component is exposed to light, or having a colour that changes when the timepiece component is exposed to light and under the effect of a stimulus, and having a phosphorescent appearance when the timepiece component is in the dark.

[0010] Thus, when a timepiece component according to the invention is exposed to light, the first photoluminescent material deposited on said component disappears so as to leave behind a metallic appearance obtained by the second material.

[0011] Thus, the timepiece component exposed to light has an enhanced aesthetic appearance, the unsightly first photoluminescent material being thereby hidden, while a beautiful phosphorescent appearance is achieved in the dark.

[0012] The invention also relates to a timepiece comprising such an assembly.

[0013] The present invention includes the following aspects: 1. A timepiece component comprising a substrate (6) and at least one first decorative component (1), said first decorative component (1) comprising at least one first photoluminescent material intended to obtain a phosphorescent appearance, characterised in that said timepiece component comprises a second decorative component (3), said second decorative component (3) comprising at least one second material, said second material being metal-containing and intended to obtain a metallic appearance, or being colour-changing and intended to obtain a colour that changes under the effect of a stimulus, said first decorative component (1) and said second decorative component (3) being arranged relative to one another on a substrate (6) so as to form a decoration having a metallic appearance or a colour that changes under the effect of a stimulus when said timepiece component is exposed to light, and having a phosphorescent appearance when said timepiece component is in the dark.

[0014] 2. A component according to aspect 1, characterized in that the decoration is a double-layer decoration, formed by a first layer that is at least translucent, and a second layer, wherein the first layer constitutes a first decorative component (1) and comprises a first base material, and a photoluminescent pigment (2) is dispersed in the first base material as a first material, and the second layer constitutes a second decorative component (3) and comprises a second base material, and leafing metallization or metal particles (4) or color-changing particles are dispersed in the second base material as a second material, and the second layer is arranged between a substrate (6) and the first layer intended to be placed as close to the user as possible.

[0015] 3. The component according to aspect 2, characterized in that the first transparent layer contains 1% to 10% by weight of the photoluminescent pigment (2).

[0016] 4. Component according to aspect 1, characterized in that the decoration is a double-layer decoration formed by a first layer and a second transparent layer, the first layer constituting a first decorative component (1) and comprising a first base material, photoluminescent pigments (2) being dispersed in the first base material as a first material, the second transparent layer constituting a second decorative component (3) and comprising a second base material, non-leafing metallization or metal particles (4) or color-changing particles being dispersed in the second base material as a second material, the first layer being arranged between a substrate (6) and a second layer intended to be arranged as close to the user as possible.

[0017] 5. The assembly according to aspect 4, characterized in that the second transparent layer contains less than 5 wt. % of metallized particles or less than 0.5 wt. % of color-changing particles to maintain translucency.

[0018] 6. Component according to aspect 1, characterised in that the decoration is a single-layer decoration intended to be placed as close as possible to the user and formed by a third layer (8) comprising a third base material in which the metal or metallized particles (4) or mother-of-pearl / iridescent or colour-changing particles forming the second decorative component (3) are dispersed and coated with the photoluminescent pigments (2) forming the first decorative component (1).

[0019] 7. Component according to one of the preceding aspects, characterized in that the substrate (6) is opaque or at least translucent.

[0020] 8. A component according to aspect 1, characterized in that the substrate (6) is at least translucent and is intended to be on the user side, and characterized in that the decoration is formed by a first layer that is at least translucent, and a second layer, the first layer constituting a first decorative component (1) and comprising a first base material, the photoluminescent pigment (2) being dispersed in the first base material as a first material, the second layer constituting a second decorative component (3) and being composed of a metal or mother-of-pearl / iridescent or color-changing film, the first layer being arranged between the substrate (6) and the second layer so as to be closer to the user than the second layer.

[0021] 9. A component according to aspect 1, characterized in that the substrate (6) is at least translucent and is intended to be on the user side, and characterized in that the decoration is formed by a first layer and a second layer, the first layer constituting a first decorative component (1) and comprising a first base material, in which the photoluminescent pigment (2) is dispersed as a first material, the second layer constituting a second decorative component (3) and consisting of a metal or mother-of-pearl / iridescent or color-changing film having perforations (14) perpendicular to the substrate (6), the second layer being arranged between the substrate (6) and the first layer so as to be closer to the user than the first layer.

[0022] 10. A component according to aspect 1, characterized in that the substrate (6) is at least translucent and is intended for the user side, and characterized in that the decoration is formed by a first layer that is at least translucent, and a second layer, the first layer constituting a first decorative component (1) and comprising a first base material, the photoluminescent pigment (2) being dispersed in the first base material as a first material, the second layer constituting a second decorative component (3) and being composed of a metal or mother-of-pearl / iridescent or color-changing film, the second layer being arranged on the substrate (6) on the user side, the first layer being deposited on the substrate on the opposite side of the second layer, the size of the second decorative component (3) being smaller than the size of the first decorative component (1) so as to be able to form a phosphorescent halo around the second decorative component (3).

[0023] 11. The component according to any one of aspects 8 to 10, characterized in that the metal film is a fixed metal plate or a metal layer deposited by a vapor deposition technique.

[0024] 12. Component according to one of aspects 8 to 10, characterised in that the substrate (6) comprises at least one recess (10) containing at least the first decorative component (1).

[0025] 13. Assembly according to one of the preceding aspects, characterised in that the colour-changing material consists of at least one pigment of the photochromic or thermochromic type.

[0026] 14. Timepiece comprising a component according to one of aspects 1 to 13. BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the invention will be better understood on reading the following description of different embodiments of the invention, which are provided for illustration only and are not intended to limit the scope of the invention, and the accompanying drawings, in which: - Figures 1 to 3 are diagrammatic cross-sectional views of different embodiments of a first alternative embodiment of a timepiece assembly according to the invention; and - Figures 4 to 6 are diagrammatic cross-sectional views of different embodiments of a second alternative embodiment of a timepiece assembly according to the invention. DETAILED DESCRIPTION The invention relates to a timepiece component comprising a substrate and at least one first decorative component comprising at least one first photoluminescent material intended to obtain a phosphorescent appearance in the dark.

[0029] Such a watch component can be a dial, a pointer, a speed needle, an outer ring, a watch glass (on the dial surface or on the back of the watch case) or a watch case, etc.

[0030] The substrate may be opaque or translucent, or even transparent. The opaque substrate may be metallic, for example. It may be made of brass, with a yellow or white gold base or a silver base, or of any other suitable metal or alloy that may or may not be a precious metal.

[0031] Translucent and transparent substrates may be made of glass, sapphire glass, acrylic, or any other suitable resin.

[0032] According to the invention, a timepiece component comprises a second decorative component comprising at least one second material, said second material being metal-containing and intended to obtain a metallic appearance, or intended to obtain a mother-of-pearl effect (glass particles coated with an interference layer) or being color-changing and intended to obtain a color that changes under the influence of a stimulus, said first decorative component and said second decorative component being arranged relative to one another on a substrate so as to form a decoration having a metallic appearance or a color that changes under the influence of a stimulus when said component is exposed to light and having a phosphorescent appearance when said component is in the dark.

[0033] Preferably, the first material is made of a photoluminescent pigment, preferably of the type SrAl 2 O 4 :Eu 2+ ,Dy 3+ ,B 3+ or MA1 2 Si 2 O 8 :Eu 2+ (M=Ba,Sr,Ca).

[0034] Generally speaking, the pigment content in the first decorative component can be in the range of 1 wt % to 70 wt %, at 1 wt % the first decorative component is a transparent layer and has a measured value of about 10 mCd / m at t=5 mn according to ISO standard 17514. 2 The first decorative component is an opaque layer at 70 wt % and has a light intensity of about 500 mCd / m at t=5 mn measured according to ISO standard 17514. 2 Ideally, the pigment content is equal to 50% by weight, representing a compromise between a good finish of the first decorative component and the desired light intensity.

[0035] In this specification, the term "metallic material" is used to describe a material that is at least partially metal-containing, can contain non-metallic particles and metallic particles, and a pure metallic material.

[0036] According to a first alternative embodiment of the invention, the second material of the second trim component is present in the form of particles dispersed in a second base material.

[0037] according to Figure 1 In the first embodiment of the invention shown in , the decoration is a double-layer decoration, formed by a first layer that is at least translucent or transparent, and a second layer, wherein the first layer constitutes a first decorative component 1 and comprises a first base material, and photoluminescent pigments 2 are dispersed in the first base material as a first material, and the second layer constitutes a second decorative component 3 and comprises a second base material, and leafing metallization or metal particles or mother-of-pearl particles 4 or color-changing particles are dispersed in the second base material as a second material, and the second layer 3 is arranged between a substrate 6 and the first layer 1 intended to be placed as close to the user as possible.

[0038] The first layer which is translucent or transparent in the visible spectrum and which constitutes the first decorative component 1 preferably has a thickness in the range of 0.1 mm to 2 mm.

[0039] In the particular case of the first embodiment, in which the first layer is translucent or transparent, said first layer comprises from 1 to 10% by weight of a photoluminescent pigment as defined above.

[0040] The second layer constituting the second decorative component 3 preferably has a thickness of <100 μ.

[0041] In the second layer 3, the particles are chosen to advantageously reflect light, so that the phosphorescent particles are not perceptible to the naked eye. These are leaf-type metallization or metal particles 4, which create a mirror effect for optimal light reflection. They are advantageously made of thin metal strips (for example aluminum, bronze, gold or silver) with a particle size preferably ranging from 10 μm to 500 μm, or inorganic particles (aluminum oxide, silicon dioxide and borosilicates) metallized under vacuum (for example by PVD, by which the different layers deposited advantageously enable the creation of interference colors to produce an iridescent or mother-of-pearl appearance).

[0042] The color-changing particles are formed of at least photochromic pigments or thermochromic pigments, such as spin-crossed nanoparticles.

[0043] The at least translucent first layer constituting the first decorative component 1, whose substrate contains the photoluminescent pigment 2, and the second layer constituting the second decorative component 3, whose substrate contains the metallic particles or the color-changing particles 4, overlap, the first layer 1 being intended to be placed as close as possible to the user. Thus, when the timepiece component is exposed to light, the decoration formed by the superposition of the first and second decorative components 1, 3 has a metallic appearance obtained by the second decorative component 3 or a color that changes under the effect of a stimulus associated with the color-changing material, presented beneath the first transparent decorative component 1, and when the timepiece component is in the dark, the decoration has a phosphorescent appearance obtained by the first decorative component 1 placed as close as possible to the user.

[0044] according to Figure 2In the second embodiment of the invention shown in , the decoration is a double-layer decoration formed by a first layer and a second transparent layer, the first layer constituting a first decorative component 1 and comprising a first base material, in which the photoluminescent pigments 2 as defined above are dispersed as a first material, and a second transparent layer constituting a second decorative component 3 and comprising a second base material, in which non-leafing metallization or metal particles 4 or color-changing particles are dispersed as a second material, the first layer 1 being arranged between a substrate 6 and a second layer 3 intended to be placed as close as possible to the user.

[0045] The first layer constituting the first decoration component 1 preferably has a thickness in the range of 0.1 mm to 2 mm. In this embodiment, the first layer does not necessarily have to be transparent or translucent.

[0046] The second transparent layer constituting the second decorative component 3 preferably has a thickness of <100 μm.

[0047] The non-leafing metallized or metallic particles 4 are for example the metallized particles described above for the first embodiment, but unsaturated fatty acids are used, for example, when grinding the particles to change their surface tension. This further allows for better distribution of the particles in the layer and improves wear resistance.

[0048] In the particular case of the second embodiment in which the second layer 3 is transparent, said second transparent layer comprises less than 5% by weight of metallized particles to obtain such transparency, the percentage being substantially the same for the color-changing particles.

[0049] A first layer constituting a first decorative component 1, whose substrate contains photoluminescent pigments 2, overlaps a second transparent layer constituting a second decorative component 3, whose substrate contains metallic particles or color-changing particles 4, the second layer 3 being intended to be placed as close as possible to the user. Thus, when the timepiece component is exposed to light, the decoration formed by the superposition of the first and second decorative components 1, 3 has a metallic appearance or a color that changes under the effect of a stimulus, obtained by the second decorative component 3 placed as close as possible to the user, or in association with a color-changing material, and when the timepiece component is in the dark, the decoration has a phosphorescent appearance, presented below the second transparent decorative component 3, obtained by the first decorative component 1.

[0050] according to Figure 3 In the third embodiment of the invention shown in , the decoration is a single-layer decoration, which is intended to be placed as close to the user as possible and is formed by a third layer 8 deposited on the substrate 6 on the user side so as to be as close to the user as possible, the third layer 8 comprising a third base material, in which the metal or metallized particles 4 or color-changing particles forming the second decorative component 3 are dispersed and coated with the photoluminescent pigment 2 forming the first decorative component 1.

[0051] For this purpose, metal or metallized or nacreous particles 4 or color-changing particles of the type specified above are used, the particle size of which is in the range of 100 μm to 500 μm, preferably in the range of 100 μm to 200 μm. The photoluminescent pigment 2 of the type specified above preferably has a particle size of less than 10 μm. A dispersion of the photoluminescent pigment 2 is previously produced, which contains 5 to 30% by weight of photoluminescent pigment in a polymer / solvent liquid matrix. Different methods are then possible: - The resulting dispersion of the photoluminescent pigment is sprayed directly onto the metal, metallized or color-changing particles spread out on a plate and then dried. The assembly is then ground by cryogenic grinding to separate any particles that may have adhered to one another. - The metal, metallized or color-changing particles are mixed in a dispersion of the photoluminescent pigment and the resulting mixture is then placed in an atomizer to allow the photoluminescent pigment to dry rapidly around the metal, metallized or color-changing particles. Drying can also be carried out in a tray dryer or by fluidized bed drying, and the combination is then ground by cryogenic grinding. The resulting particles are then dispersed in a third base material.

[0052] Another alternative method calls for the preparation of metallized or pearlescent effect pigments as follows. These pigments are coated with a thin and transparent prepolymer film (20-50 micrometers) by bath treatment (mixture of 80% solvent, 15% monomer, 2% hardener and 3% additives). The treated pigments are subsequently mixed with a dispersion of phosphorescent pigments by friction in a ball mill.

[0053] The pigments produced in this way are then treated to complete polymerization (thermal curing).

[0054] The third transparent layer constituting the decoration preferably has a thickness in the range of 10 μm to 100 μm.

[0055] Thus, when the timepiece component is exposed to light, the decoration formed by said third layer has a metallic appearance obtained by the metal, metallized or color-changing particles 4 or a color that changes under the effect of a stimulus associated with a color-changing material, present in the third transparent layer 8 below the coating of photoluminescent pigments 2, and when the timepiece component is in the dark, the decoration has a phosphorescent appearance obtained by the coating of photoluminescent pigments 2 formed around the metal, metallized or color-changing particles 4.

[0056] The first, second and third binders used in the first, second and third layers defined above are selected according to the method of applying the respective layer and the transparency that the layer must have.

[0057] In particular, when one of the first or second layers must be at least translucent or must be transparent, the binder and potential additives present in this layer are selected to be as transparent as possible to UV and visible radiation. For example, an acrylate binder may be selected.

[0058] The first, second and third layers comprising the relevant particles dispersed in a binder can be deposited on the substrate by spraying or dipping when the entire substrate must be coated, by screen printing when a pattern must be produced, or by, for example, pad printing when the substrate has a complex surface.

[0059] According to a second alternative embodiment of the invention, the substrate is at least translucent or transparent and the second material of the second decorative component is present in the form of a metal film fixed, for example, by adhesive bonding or formed by a vapor deposition technique such as PVD or CVD. Also lacquered metal films are conceivable.

[0060] The metal film is usually made of stainless steel, aluminum, aluminized PET or coated with a PVD gold layer.

[0061] according to Figure 4 In one embodiment of the invention shown in , the substrate 6 is at least translucent or transparent and is intended to be on the user side. In addition, the decoration is formed by an at least translucent first layer, the first layer constituting a first decorative component 1 and comprising a first base material, in which the photoluminescent pigment 2 is dispersed as a first material, and a second layer constituting a second decorative component 3 and consisting of a metal film of the type described for example with respect to the second alternative embodiment, the first layer 1 being arranged between the substrate 6 and the second layer 3 so that the first transparent layer 1 is intended to be closer to the user than the second layer 3.

[0062] Furthermore, the size of the second decoration component 3 is preferably adjusted to substantially overlap the surface covered by the first decoration component 1 .

[0063] The translucent or transparent first layer constituting the first decorative component 1 preferably has a thickness in the range of 0.1 mm to 2 mm. It contains 1 wt % to 10 wt % of the photoluminescent pigment as described above so as to be translucent or transparent.

[0064] The at least translucent first layer constituting the first decorative component 1, whose substrate contains the photoluminescent pigment 2, and the second layer constituting the second decorative component 3, whose substrate contains the metal particles or the color-changing particles 4, overlap, the first layer 1 being intended to be placed closer to the user than the second layer 3. Thus, when the timepiece component is exposed to light, the decoration formed by the superposition of the first and second decorative components 1, 3 has a metallic appearance obtained by the second decorative component 3 or a color that changes under the effect of a stimulus associated with a color-changing material, presented beneath the first transparent decorative component 1, and when the timepiece component is in the dark, the decoration has a phosphorescent appearance obtained by the first decorative component 1 placed as close as possible to the user.

[0065] Advantageously, the substrate 6 comprises at least one recess 10 etched therein, for example by laser, said recess 10 containing at least the first decorative component 1 .

[0066] Advantageously, the film constituting the second decorative component 3 is deposited by vapor deposition techniques (CVD or PVD) on the surface 11 of the first decorative component 1 exposing the groove 10 and possibly on the edge region 12 of the substrate 6. The thickness of the metal foil is generally in the range of 50 μm to 100 μm.

[0067] according to Figure 5 In another embodiment of the invention shown in , the substrate 6 is at least translucent or transparent and is intended to be on the user side. In addition, the decoration is formed by a first layer and a second layer, the first layer constituting a first decorative component 1 and comprising a first base material, in which the photoluminescent pigment 2 is dispersed as a first material, the second layer constituting a second decorative component 3 and consisting of a metal film, for example of the type described with respect to the second alternative embodiment, with perforations 14 perpendicular to the substrate 6, the second layer 3 being arranged between the substrate 6 and the first layer 1 so that the second layer 3 with perforations is intended to be closer to the user than the first layer 1.

[0068] It is preferred to make perforations 14 having a diameter of 100 μm to 200 μm in the metal film or the color-changing film by laser after depositing the metal film or the color-changing film on the substrate 6, for example, by a vapor deposition technique (CVD or PVD). The thickness of the metal foil is generally in the range of 50 μm to 100 μm. In addition, it is preferred to adjust the size of the second decorative component 3 to substantially overlap the surface covered by the first decorative component 1.

[0069] Advantageously, the substrate 6 comprises at least one recess 10 etched therein, for example by laser, at the bottom of which is deposited the perforated metal film or the color-changing film constituting the second decorative component 3 , said recess being filled by the first layer constituting the first decorative component 1 .

[0070] Advantageously, in particular if the surface area occupied by the first decorative element 1 on the substrate is greater than the surface area occupied by the second decorative element 3 , the first layer constituting the first decorative element is preferably translucent or transparent as detailed above.

[0071] A first layer constituting a first decorative component 1, whose substrate contains photoluminescent pigments 2, and a second layer constituting a second decorative component 3, whose substrate contains metallic particles or color-changing particles 4, overlap, the second layer 3 being intended to be placed closer to the user than the first layer 1. Thus, when the timepiece component is exposed to light, the decoration formed by the superposition of the first and second decorative components 1, 3 has a metallic appearance or a color that changes under the effect of a stimulus, obtained by the second decorative component 3 placed as close as possible to the user, or a color associated with a color-changing material, and when the timepiece component is in the dark, the decoration has a phosphorescent appearance obtained by the first decorative component 1, presented through the perforations 14 of the second decorative component 3.

[0072] according to Figure 6In another embodiment of the invention shown in , the substrate 6 is at least translucent or transparent and is intended on the user side. In addition, the decoration is formed by an at least translucent first layer, which constitutes a first decorative component 1 and comprises a first base material, in which the photoluminescent pigment 2 is dispersed as a first material, and a second layer, which constitutes a second decorative component 3 and is composed of a metal film of the type described for example in relation to the second alternative embodiment, the second layer 3 being arranged on the substrate 6 on the user side, the first layer 1 being deposited on the substrate 6 on the opposite side of the second layer 3, the second decorative component occupying a surface area on the substrate 6 of a smaller size than the surface area of ​​the first decorative component 1, so as to be able to form a phosphorescent halo around the second decorative component 3 when the watch component is in the dark.

[0073] Advantageously, the substrate 6 comprises at least one recess 10 etched therein, for example by laser, which is open on the face opposite the second decorative component 3 and which is filled with the first layer constituting the first decorative component 1 .

[0074] Advantageously, the film constituting the second decorative component 3 is deposited by a vapor deposition technique (CVD or PVD) on the surface of the substrate 6 so as to be as close as possible to the user.

[0075] A first layer constituting a first decorative component 1, whose base contains photoluminescent pigments 2, and a second layer constituting a second decorative component 3, whose base contains metal particles or color-changing particles 4, overlap, the second layer 3 being intended to be placed closer to the user than the first layer 1. Thus, when the timepiece component is exposed to light, the decoration formed by the superposition of the first and second decorative components 1, 3 has a metallic appearance or a color that changes under the effect of a stimulus, obtained by the second decorative component 3 placed as close as possible to the user, or in association with a color-changing material, and when the timepiece component is in the dark, the decoration has a phosphorescent halo obtained by the first decorative component 1, present at the periphery of the second decorative component 3.

Claims

1. A timepiece component comprising a substrate (6) and at least one first decorative component (1), said first decorative component (1) comprising at least one first photoluminescent material intended to obtain a phosphorescent appearance, characterized in that The timepiece component comprises a second decorative component (3), the second decorative component (3) comprising at least one second material, the second material being metal-containing and intended to obtain a metallic appearance, or being color-changing and intended to obtain a color that changes under the effect of a stimulus, the first decorative component (1) and the second decorative component (3) being arranged relative to each other on a substrate (6) to form a decoration having a metallic appearance or a color that changes under the effect of a stimulus when the timepiece component is exposed to light, and having a phosphorescent appearance when the timepiece component is in the dark, The decoration is a double-layer decoration formed by a first layer which is at least translucent, and a second layer, wherein the first layer constitutes a first decoration component (1) and comprises a first base material, in which photoluminescent pigments (2) are dispersed as a first material, and the second layer constitutes a second decoration component (3) and comprises a second base material, in which leafing metallization or metal particles (4) or color-changing particles are dispersed as a second material, and the second layer is arranged between a substrate (6) and the first layer intended to be arranged as close as possible to a user.

2. An assembly according to claim 1, characterised in that The first transparent layer contains 1 to 10 wt % of the photoluminescent pigment (2).

3. Assembly according to one of the preceding claims, characterized in that The color-changing material consists of at least one pigment of the photochromic or thermochromic type.

4. Timepiece comprising an assembly according to any one of claims 1 to 3.

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