EP3327517A1 - Zifferblatt für eine uhr - Google Patents

Zifferblatt für eine uhr Download PDF

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Publication number
EP3327517A1
EP3327517A1 EP16200687.8A EP16200687A EP3327517A1 EP 3327517 A1 EP3327517 A1 EP 3327517A1 EP 16200687 A EP16200687 A EP 16200687A EP 3327517 A1 EP3327517 A1 EP 3327517A1
Authority
EP
European Patent Office
Prior art keywords
substrate
dial
layer
light source
window
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16200687.8A
Other languages
English (en)
French (fr)
Other versions
EP3327517B1 (de
Inventor
Frédéric Dreyer-Gonzales
Arnaud HOURIET
Cédric Chavaillaz
Joël PERRET
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Officine Panerai AG
Original Assignee
Officine Panerai AG
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Filing date
Publication date
Application filed by Officine Panerai AG filed Critical Officine Panerai AG
Priority to EP16200687.8A priority Critical patent/EP3327517B1/de
Publication of EP3327517A1 publication Critical patent/EP3327517A1/de
Application granted granted Critical
Publication of EP3327517B1 publication Critical patent/EP3327517B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • 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
    • G04B19/30—Illumination of dials or hands
    • 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
    • G04B19/30—Illumination of dials or hands
    • G04B19/32—Illumination of dials or hands by luminescent substances

Definitions

  • the present invention relates to the field of watchmaking. It relates, more particularly, a watch face and its manufacturing process.
  • Panerai House is well known for its multi-level black dials, whose indexes are formed by openings in a top plate. These openings show a lower plate with a luminescent layer. This arrangement provides a clearly readable dial, not only during the day, but also during the night.
  • the readability of the dial depends on the contrast between the color of the top plate and that of the bottom plate, especially under strong direct light. Typically, a black color layer is applied to the top plate to provide this contrast.
  • varnishes and paints commonly used for this purpose reflect too much incident light to provide sufficient readability in case of strong direct light. This disadvantage occurs even when the black color is formed of amorphous carbon deposited in the vapor phase, as described in the document CH705576 .
  • the object of the invention is therefore to provide a timepiece dial, in which the aforementioned defects are at least partially overcome.
  • the invention also relates to a method of manufacturing such a dial.
  • the invention relates to a dial for a timepiece.
  • This dial is multilevel, and for this purpose comprises a first substrate comprising a first surface intended to be located next to a watch glass, and a second surface on the opposite side to said first surface.
  • the first substrate further comprises at least one window, constituted for example by an opening in the case of an opaque material and an optical passage in the case of a translucent material, this window serving as an index.
  • the dial further comprises at least one second substrate fixed to said first substrate facing said second surface and which is associated with a light source, said second substrate comprising a zone facing said at least one window. Therefore, a portion of the second substrate, or a coating thereon, is visible through the window (s).
  • the upper surface of the first substrate comprises a tinted layer on at least a portion of its surface, which according to the invention comprises carbon nanotubes.
  • the windows can be formed by selective deposition of this layer.
  • the use of carbon nanotubes in the layer gives the first substrate a particularly deep blackness, which improves the contrast with the surface of said area of the second visible substrate through the openings. This contrast is even sufficient to provide adequate contrast when the dial is subjected to direct strong illumination, and minimizes light reflections from its surface.
  • said layer comprises a varnish comprising at least 0.1% by weight, preferably at least 1.0% by weight, of carbon nanotubes.
  • the dial can thus be produced using conventional coating equipment, without having to subject the dial to a source of heat.
  • said layer comprises carbon nanotubes deposited directly on said surface or directly on an additional substrate fixed to said surface.
  • a particularly dark color, which has a light absorption coefficient approaching 100% is therefore obtained.
  • at least 50% of the carbon nanotubes may extend substantially perpendicular to the plane of said first substrate.
  • the light source may be a luminescent coating deposited on said second substrate facing said opening, by example in a hollow formed in the surface of this substrate for this purpose, or directly on the flat surface of the latter.
  • the second substrate can even be made of a luminescent material.
  • the light source comprises an electric light source, for example a thin-film LED placed on the surface of the second substrate, a conventional LED or thin-film placed between the two substrates and whose light is reflected by a paint, a surface treatment or coating, a fluorescent tint, the native surface of the substrate, or the like, visible through the apertures, or the like.
  • the light source may be passive, such as an element comprising a photoluminescent material, for example a tritium element.
  • a dial is obtained in which the use of carbon nanotubes in said layer confers a particularly deep blackness to the first substrate, which improves the contrast with the surface of said zone of the second visible substrate through the openings. This contrast is sufficient even to provide adequate contrast when the dial is subjected to direct strong illumination, and minimizes light reflections from its surface.
  • said layer is applied in the form of a varnish comprising at least 0.1% by weight, preferably at least 1% by mass, of carbon nanotubes, which is compatible with common coating equipment, and does not require any heating. of the substrate.
  • the method further comprises a step of burning at least a portion of said layer to generate a combustion of at least a portion of said varnish.
  • a portion of the varnish is converted to amorphous carbon, which reduces the surface brightness and makes it even duller.
  • said layer is applied by a deposition method, for example a PVD, CVD or similar deposit.
  • At least 20% of the carbon nanotubes extend substantially perpendicular to the plane of said first substrate, which provides a particularly deep blackness to the first substrate.
  • the light source is a luminescent coating deposited on said second substrate, for example in a hollow created for this purpose, or directly on a flat surface of the substrate.
  • the light source may comprise an electric light source, for example a thin-film LED placed on the surface of the second substrate, a conventional LED placed between the two substrates and whose light is reflected by a paint, a surface treatment , a fluorescent shade or the like visible through the openings.
  • the light source may be a tritium element, or an element comprising any other photoluminescent material.
  • the invention also relates to a dial as defined above obtained and / or obtainable by a method as described above, as well as a timepiece comprising such a dial.
  • the figure 1 schematically illustrates a dial 1 according to the invention, in plan and in section along the line AA.
  • This dial 1 comprises a first substrate 3 forming an upper plate, which is perforated in predetermined regions to form windows 5 as an index.
  • these windows 5 are constituted by openings in the first substrate 3.
  • This substrate 3 comprises a first surface 19, intended to be facing a glass of a timepiece and therefore visible to a user , and a second surface 20, opposite said first.
  • the first substrate 3 is superimposed on a second substrate 7, forming a lower plate, facing the second surface 20 of the first substrate 3.
  • the second substrate 7 is a disc having substantially the same diameter as the first 3, but it is also possible that the second substrate is divided into several parts, each being located under corresponding windows.
  • the second substrate 7 may carry dial feet 9, if the construction of the part in which the dial 1 is intended to be integrated requires it.
  • This second substrate 7 is fixed below the first 3, for example by gluing, welding, clamping, or by means of pins, pads, screws, or the like.
  • the dial 1 may comprise, as generally known, openings 17 for the passage of the needle axes.
  • the second substrate 7 is associated with a light source.
  • this light source is a layer 11 of a luminescent material that comprises the surface of the second substrate 7. This layer is provided in recesses 13 formed in the upper surface of the second substrate 7.
  • luminescent is meant (at least partially) photoluminescent, phosphorescent, fluorescent or the like.
  • a varnish can be made luminescent for example by adding luminescent particles.
  • the two substrates 3, 7 may be spaced from each other, and the light source may be on the upper surface of the second substrate 7, as schematically illustrated in the figure 2 .
  • the second substrate 7 may of course include recesses 13 for receiving the light source.
  • the entire surface of the second substrate 7 may be coated with a luminescent layer, or the second substrate 7 itself may be made of a material that is at least partially luminescent as such.
  • the light source 11 may for example be a thin-film LED powered by a battery.
  • the LED is below the window 5 and is therefore directly visible to the user.
  • the light source is a conventional LED, arranged such that it emits light beams in the gap between the two substrates 3, 7.
  • a conventional light bulb is also possible.
  • a zone 11a of light color or having a colored or fluorescent layer may be located opposite the window 5.
  • the LED can emit visible light, or ultraviolet.
  • the entire upper surface of the second substrate 7 is colored or dyed, a surface treatment, a reflective coating (for example metallic) or a fluorescent layer in order to convert and / or broadcast the light emanating from the LED.
  • the LED may be a thin-film LED which is located on the lower surface of the first substrate 3 facing the second substrate 7, or on the upper surface of the second substrate 7 facing the first 3.
  • the lower surface of the first substrate 3 can be arranged to reflect the light emanating from the LED, for example by being polished, colored, or the like.
  • a tritium element can also serve as a light source 11.
  • the first substrate 3 is formed of translucent or transparent material, such as glass, quartz, a transparent polymer or the like, and the window 5 is formed as a part of the substrate 3 which does not have a tinted layer 21 in predetermined regions and thus let in light.
  • This solution can also be applied to any other embodiment such as described above.
  • the light source 11 is outside the substrates 3, 7, and its light is reflected between the surfaces of the latter.
  • This solution is suitable for use with any light source, for example a tritium element, an LED, a bulb, or the like.
  • all or part of the upper surface 19 of the first substrate 3 is provided with a layer 21 comprising carbon nanotubes, more particularly at least 0.1% by weight of such nanotubes, or preferably at least 1.0% by mass.
  • nanotubes can produce an extremely deep black color, with a very high absorption coefficient, up to 99.955%. Therefore, even in the case of a strong direct light, the amount of reflected light remains very small, and the contrast between the color of the first substrate 3 and the portions of the surface of the second substrate 7 visible through the windows 5, stay good.
  • This layer 21 may, for example, be a varnish comprising at least 0.1% by weight of carbon nanotubes, which remains compatible with varnishing equipment already used.
  • the base of the varnish can be transparent or already black.
  • the layer 21 may be a carpet of carbon nanotubes deposited directly on the first substrate 3 or on an additional substrate which is subsequently secured to the first substrate 3.
  • a carpet may for example comprise at least 50% by weight of carbon nanotubes. or at least 60%, 70%, 80% or 90% by weight, the rest being other forms of carbon (particularly the amorphous form).
  • Vacuum deposition methods for example by evaporation High temperature carbon in a noble gas environment at high pressure (which represents a form of PVD), laser ablation synthesis, or CVD synthesis can be used.
  • the carbon nanotubes may be single-leaf or multi-wall, or a mixture of both, and typically have a diameter of the order of a few nanometers.
  • the carbon nanotubes extend mainly in a direction perpendicular to the plane of the dial, the light absorption effect is particularly pronounced, since the light enters the nanotubes and the interstices between the nanotubes, from where it can difficult to get out without being absorbed. In such a case, it is possible to provide a proportion of at least 20%, at least 30% or even 40% or more nanotubes that follow this direction.
  • a thickness of the layer 21 between 0.05 mm and 1 mm ensures a sufficient absorption of light, and to prevent the layer 21 becomes too thick.
  • This carpet may optionally be itself coated with a protective layer, such as a varnish, or a deposit of another material, to prevent the nanotubes from breaking off the substrate and generate carbon dust at the same time. inside the room.
  • a protective layer such as a varnish, or a deposit of another material, to prevent the nanotubes from breaking off the substrate and generate carbon dust at the same time. inside the room.
  • This protective layer can also be burned as described above.
  • the dial thus constructed therefore has an ultra-black appearance on the first substrate 3, which makes an excellent contrast with the portions of the second substrate 7 visible through the windows 5, even in the case of a very strong direct illumination.
  • FIG 4 schematically illustrates a variant of a method of manufacturing a dial 1 according to the invention. Only a portion of the dial and its components are illustrated in these figures, as is the case for Figures 2 and 3 .
  • a first substrate 3 which may be a metal plate, plastic, crystalline material (diamond, alumina, silicon, SiN, SiC, SiO or the like) or any other suitable material.
  • step 102 the plate constituting the first substrate 3 is perforated, if necessary, to form the openings 5 acting as windows 5 intended to form indexes.
  • These openings 5 can be created by cutting, stamping, wet or dry etching, or any other suitable method.
  • This step may be omitted if the first substrate 3 is created at least partially by additive manufacturing, and if the windows are formed as openings manufactured at the same time as the substrate 3.
  • the first substrate 3 is translucent and the windows are intended to be formed by selective deposition of the layer 21 in the next step, this step can also be omitted.
  • the layer 21 comprising carbon nanotubes is applied to the upper surface 19 of the first substrate 3, either directly or by being formed on an intermediate plate which is attached to the first substrate 3.
  • this application can be carried out by means of a coating, a PVD process, a CVD process, or the like.
  • a possible protective layer may also be applied after formation of the layer 21.
  • the windows 5 may be formed by selective deposition of the layer 21, as mentioned above.
  • step 104 it is provided with a second substrate 7, which may be made of a material as for the first substrate 3 (see above).
  • a recess 13 has already been formed in an area of the second substrate 7 intended to face the opening 5. This recess 13 has previously been filled with a luminescent material 11.
  • the two substrates 3, 7 are brought together, and then secured to one another to form the dial 1, for example by gluing, welding, screwing, clamping or the like.
  • steps 102 and 103 may take place in an opposite order, i.e., layer 21 may be applied to surface 19 of substrate 3 before cutting (where appropriate).
  • this variant requires more manipulations of the coated substrate, which increases the risk of scratches and other surface damage.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
EP16200687.8A 2016-11-25 2016-11-25 Zifferblatt für eine uhr Active EP3327517B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16200687.8A EP3327517B1 (de) 2016-11-25 2016-11-25 Zifferblatt für eine uhr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16200687.8A EP3327517B1 (de) 2016-11-25 2016-11-25 Zifferblatt für eine uhr

Publications (2)

Publication Number Publication Date
EP3327517A1 true EP3327517A1 (de) 2018-05-30
EP3327517B1 EP3327517B1 (de) 2020-08-12

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Family Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3954247A1 (de) 2020-08-11 2022-02-16 Omega SA Mit steinen verzierte schwarze komponente und ihr herstellungsverfahren
EP3954802A1 (de) 2020-08-11 2022-02-16 Omega SA Mit steinen verzierte schwarze komponente und ihr herstellungsverfahren
EP3955062A1 (de) 2020-08-11 2022-02-16 The Swatch Group Research and Development Ltd Schwarze komponente und ihr herstellungsverfahren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110301282A1 (en) * 2010-06-03 2011-12-08 Eric Magni Black colored master batch carbon nanotube and method of manufacture thereof
CH705576B1 (fr) 2012-06-28 2013-04-15 Serge Bourquard Procédé de déposition d'un revêtement décoratif et de protection.
CH711141A2 (fr) * 2015-05-26 2016-11-30 FEHR et Cie SA Procédé de fabrication d'un cadran de montre noir comportant des nanotubes de carbone, et cadran de montre noir obtenu par un tel procédé.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110301282A1 (en) * 2010-06-03 2011-12-08 Eric Magni Black colored master batch carbon nanotube and method of manufacture thereof
CH705576B1 (fr) 2012-06-28 2013-04-15 Serge Bourquard Procédé de déposition d'un revêtement décoratif et de protection.
CH711141A2 (fr) * 2015-05-26 2016-11-30 FEHR et Cie SA Procédé de fabrication d'un cadran de montre noir comportant des nanotubes de carbone, et cadran de montre noir obtenu par un tel procédé.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Histoire Officine Panerai", 8 October 2016 (2016-10-08), XP055377805, Retrieved from the Internet <URL:https://web.archive.org/web/20161008022128/http://www.panerai.com:80/fr/a-propos-de-panerai/histoire.html#1938> [retrieved on 20170601] *
ANONYMOUS: "Optical properties of carbon nanotubes - Wikipedia, the free encyclopedia", 8 October 2016 (2016-10-08), XP055377842, Retrieved from the Internet <URL:https://web.archive.org/web/20161008201104/https://en.wikipedia.org/wiki/Optical_properties_of_carbon_nanotubes> [retrieved on 20170601] *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3954247A1 (de) 2020-08-11 2022-02-16 Omega SA Mit steinen verzierte schwarze komponente und ihr herstellungsverfahren
EP3954802A1 (de) 2020-08-11 2022-02-16 Omega SA Mit steinen verzierte schwarze komponente und ihr herstellungsverfahren
EP3955062A1 (de) 2020-08-11 2022-02-16 The Swatch Group Research and Development Ltd Schwarze komponente und ihr herstellungsverfahren
WO2022033741A1 (fr) 2020-08-11 2022-02-17 The Swatch Group Research And Development Ltd Composant noir et son procede de fabrication
WO2022033839A1 (fr) 2020-08-11 2022-02-17 Omega Sa Composant noir decore de pierres et son procede de fabrication
US20220050419A1 (en) * 2020-08-11 2022-02-17 Omega Sa Black component decorated with stones and manufacturing method thereof
CN114073362A (zh) * 2020-08-11 2022-02-22 奥米加股份有限公司 用宝石装饰的黑色构件及其制造方法
CN116034178A (zh) * 2020-08-11 2023-04-28 奥米加股份有限公司 用宝石装饰的黑色部件及其制备方法
US12072674B2 (en) * 2020-08-11 2024-08-27 Omega Sa Black component decorated with stones and manufacturing method thereof

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