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EP3379345A1 - Skeleton watch with photochromic dial - Google Patents

Skeleton watch with photochromic dial Download PDF

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Publication number
EP3379345A1
EP3379345A1 EP17162066.9A EP17162066A EP3379345A1 EP 3379345 A1 EP3379345 A1 EP 3379345A1 EP 17162066 A EP17162066 A EP 17162066A EP 3379345 A1 EP3379345 A1 EP 3379345A1
Authority
EP
European Patent Office
Prior art keywords
watch
photochromic
plate
dial
inclusions
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.)
Withdrawn
Application number
EP17162066.9A
Other languages
German (de)
French (fr)
Inventor
Christian Verdon
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.)
Rado Uhren AG
Original Assignee
Rado Uhren AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rado Uhren AG filed Critical Rado Uhren AG
Priority to EP17162066.9A priority Critical patent/EP3379345A1/en
Priority to KR1020197027512A priority patent/KR102250026B1/en
Priority to EP18707934.8A priority patent/EP3602205B1/en
Priority to CN202410547450.6A priority patent/CN118244600A/en
Priority to JP2019572283A priority patent/JP6765018B2/en
Priority to US16/495,168 priority patent/US11422509B2/en
Priority to CN201880019275.6A priority patent/CN110431493A/en
Priority to PCT/EP2018/055530 priority patent/WO2018172068A1/en
Publication of EP3379345A1 publication Critical patent/EP3379345A1/en
Withdrawn legal-status Critical Current

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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
    • G04B45/00—Time pieces of which the indicating means or cases provoke special effects, e.g. aesthetic effects
    • G04B45/02—Time pieces of which the clockwork is visible partly or wholly
    • 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
    • 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
    • G04B19/12—Selection of materials for dials or graduations markings
    • 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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/002—Watch crystals; Fastening or sealing of crystals; Clock glasses made of glass
    • 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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses
    • G04B39/004—Watch crystals; Fastening or sealing of crystals; Clock glasses from a material other than glass
    • 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

Definitions

  • the invention relates to a watch including a watch called skeleton watch.
  • the dial of the watch can be removed, made of a transparent material or in a perforated plate so as to reveal the watch movement behind the dial.
  • the invention aims to remedy the drawbacks of the state of the art by providing a watch, including a skeleton watch to read the time and the possible logo more easily regardless of the light conditions.
  • the photochromic plate is darkened under the effect of U.V. radiation and it clears under the effect of ambient heat and this, indefinitely reversible.
  • the watch movement is visible behind the dial because the photochromic plate is transparent to the visible spectrum.
  • the photochromic plate is exposed to UV rays, the dial becomes darkened. The more the dial of the watch is exposed to a significant amount of UV rays, the darker it becomes until it becomes opaque, allowing the needles to appear clearly in contrast to the opaque dial of the watch.
  • the first threshold value and the second threshold value depend on the material or materials chosen for the photochromic plate.
  • a watch 1 according to one embodiment of the invention will now be described with reference to Figures 1 to 4 .
  • This watch 1 comprises a watch case 2 which contains a watch movement 3.
  • the box 2 comprises a middle part 2a, a first and a second closure element of the box, respectively an ice cream 5 and a bottom F.
  • the middle part 16 is provided with four bases for fixing the bracelet B.
  • the bottom F is fixed to the middle 2a by means of screws not shown in the drawing and the ice 5 is driven conventionally in a clearance of the middle part with the interposition of a seal.
  • the ice is made of a material transparent to UV rays.
  • the watch movement 3 makes it possible to rotate the needles 4.
  • the watch 1 also comprises a dial 5.
  • the dial 5 closes the watch case 2.
  • the dial 5 is placed directly above the watch movement 3.
  • the dial 5 is interposed between the watch movement 3 and the needles 4.
  • Needles 4 preferably have a light shade, typically white, so as to be more visible on the dial.
  • the dial 5 is formed of a photochromic plate 6 disposed directly above the watch movement 3 and directly below the needles 4.
  • the photochromic plate 6 comprises a plate of a transparent material in which are included photochromic substances or which is coated with a coating containing photochromic substances.
  • the photochromic plate 6 darkens under the effect of UV radiation and clears under the effect of ambient heat indefinitely reversible. This phenomenon is obtained by the activation of molecules of photochromic substances. Absorption of the photochromic plate is determined at all times by the balance between the number of photosensitive molecules activated by UV stimulation and the number of molecules deactivated by heat.
  • the photochromic plate 6 is formed of a synthetic resin, preferably a polycarbonate resin or a UV-transparent acrylic resin in which oxazine molecules and / or naphthopyran compounds are dispersed in the mass.
  • a synthetic resin preferably a polycarbonate resin or a UV-transparent acrylic resin in which oxazine molecules and / or naphthopyran compounds are dispersed in the mass.
  • the thickness of the plate is of the order of 0.85 mm.
  • the photochromic plate is a plate of a material transparent to the radiation coated with a photochromic layer in the form of a polymer film including photochromic material identical to that described in the paragraph above.
  • the photochromic plate is a mineral glass in which the photochromic inclusions are inclusions of a silver halide compound and / or silver bromide.
  • the photochromic inclusions are inclusions of a silver halide compound and / or silver bromide.
  • the silver-halide / bromide bonds break and the silver atoms associate with each other, which darkens the plate.
  • the silver - halide bonds are reconstituted as soon as UV exposure stops, restoring clarity to the plaque.
  • an inscription 7 can be engraved or printed on the dial.
  • the Figures 2 to 4 represent the evolution of the hue of the dial 5 as a function of its exposure to UV rays.
  • the figure 2 represents the watch when it is not exposed to UV rays.
  • the dial is then transparent so that the watch movement is visible through the dial.
  • the figure 3 represents the watch when exposed to a small amount of UV. This amount of UV is typically between the first threshold value and the second threshold value. In this case, the dial is partially obscured, so that the watch movement is partially visible through the dial. In addition, the needles 4 and the inscription 7 begin to stand out in contrast so as to be readable despite the increase in brightness. Indeed, the darkening of the dial limits the reflections related to the watch movement.
  • the figure 4 represents the watch when it is exposed to a quantity of UV greater than the second threshold quantity.
  • the dial has taken a dark hue so that it completely masks the watch movement. Needles 4 and the inscription 7 are then very visible, despite a strong luminosity.
  • indexes could for example be engraved or printed on the photochromic plate, which would make it possible to have a skeleton watch with visible indexes while passing by flushing.
  • the dial could also have other forms than the one shown.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Surface Treatment Of Glass (AREA)
  • Electric Clocks (AREA)

Abstract

Montre squelette (1) comportant un mouvement horloger (3) logé dans une boite de montre (2), le mouvement horloger (3) étant agencé pour entraîner en rotation au moins une aiguille (4), le mouvement horloger (3) étant recouvert par un cadran (5), le cadran (5) étant disposé entre le mouvement horloger (3) et ladite au moins une aiguille (4), le cadran (5) étant constitué d'une plaque photochromique (6) de façon à ce que :
- le mouvement horloger (3) soit apparent lorsque la plaque photochromique (6) est exposée à une quantité de rayons UV inférieure à une première valeur seuil ;
- le mouvement horloger (3) soit masqué lorsque la plaque photochromique (6) est exposée à une quantité de rayons UV supérieure à une deuxième valeur seuil.

Figure imgaf001
Skeleton watch (1) comprising a watch movement (3) housed in a watch case (2), the watch movement (3) being arranged to rotate at least one needle (4), the watch movement (3) being covered by a dial (5), the dial (5) being arranged between the watch movement (3) and said at least one needle (4), the dial (5) consisting of a photochromic plate (6) so that than :
the watch movement (3) is apparent when the photochromic plate (6) is exposed to a quantity of UV rays less than a first threshold value;
the watch movement (3) is masked when the photochromic plate (6) is exposed to a quantity of UV rays greater than a second threshold value.
Figure imgaf001

Description

Domaine de l'inventionField of the invention

L'invention se rapporte à une montre notamment une montre dite montre squelette.The invention relates to a watch including a watch called skeleton watch.

Arrière-plan de l'inventionBackground of the invention

Dans les montres squelettes de l'art antérieur, le cadran de la montre peut être supprimé, fait en un matériau transparent ou dans une plaque ajourée de façon à laisser apparaître le mouvement horloger derrière le cadran.In the skeleton watches of the prior art, the dial of the watch can be removed, made of a transparent material or in a perforated plate so as to reveal the watch movement behind the dial.

De telles montres sont esthétiques, mais lorsque la luminosité est importante, l'heure est difficilement lisible car les aiguilles sont peu contrastées par rapport au mouvement horloger.Such watches are aesthetic, but when the brightness is important, the time is difficult to read because the needles are little contrast with the watch movement.

En outre, il est difficile d'avoir un logo lisible sur une montre squelette, surtout lorsque la luminosité est importante.In addition, it is difficult to have a legible logo on a skeleton watch, especially when the brightness is important.

Résumé de l'inventionSummary of the invention

L'invention vise à remédier aux inconvénients de l'état de la technique en proposant une montre, notamment une montre squelette permettant de lire l'heure et le logo éventuel plus facilement quelles que soient les conditions de luminosité.The invention aims to remedy the drawbacks of the state of the art by providing a watch, including a skeleton watch to read the time and the possible logo more easily regardless of the light conditions.

Pour ce faire, est proposé selon un premier aspect de l'invention, une montre, comportant un mouvement horloger logé dans une boite de montre formée d'une carrure, fermée par une glace et un fond, le mouvement horloger étant agencé pour entraîner en rotation au moins une aiguille, le mouvement horloger étant recouvert par un cadran visible à travers la glace, le cadran étant disposé entre le mouvement horloger et ladite au moins une aiguille, la montre étant caractérisée en ce que la glace est transparente aux rayons UV et en ce que le cadran est constitué d'une plaque photochromique de façon à ce que :

  • le mouvement horloger soit apparent lorsque la plaque photochromique est exposée à une quantité de rayons UV inférieure à une première valeur seuil ;
  • le mouvement horloger soit masqué lorsque la plaque photochromique est exposée à une quantité de rayons UV supérieure à une deuxième valeur seuil.
To do this, is proposed according to a first aspect of the invention, a watch, comprising a watch movement housed in a watch case formed of a middle part, closed by an ice and a bottom, the watch movement being arranged to lead into rotation at least one needle, the watch movement being covered by a dial visible through the ice, the dial being disposed between the watch movement and said at least one needle, the watch being characterized in that the ice is transparent to the UV rays and that the dial consists of a photochromic plate so that:
  • the watch movement is apparent when the photochromic plate is exposed to a quantity of UV rays less than a first threshold value;
  • the watch movement is masked when the photochromic plate is exposed to a quantity of UV radiation greater than a second threshold value.

En effet, la plaque photochromique s'obscurcit sous l'effet du rayonnement U.V. et elle s'éclaircit sous l'effet de la chaleur ambiante et ce, de manière indéfiniment réversible. Ainsi, lorsque la montre n'est pas exposée à un rayonnement UV, typiquement lorsque la montre est portée en intérieur, le mouvement horloger est visible derrière le cadran car la plaque photochromique est transparente au spectre visible. Au contraire, lorsque la plaque photochromique est exposée à des rayons UV, le cadran s'obscurcit. Plus le cadran de la montre est exposé à une quantité importante de rayons UV et plus il s'obscurcit jusqu'à devenir opaque, ce qui permet aux aiguilles d'apparaitre clairement par contraste avec le cadran opaque de la montre.Indeed, the photochromic plate is darkened under the effect of U.V. radiation and it clears under the effect of ambient heat and this, indefinitely reversible. Thus, when the watch is not exposed to UV radiation, typically when the watch is worn indoors, the watch movement is visible behind the dial because the photochromic plate is transparent to the visible spectrum. On the contrary, when the photochromic plate is exposed to UV rays, the dial becomes darkened. The more the dial of the watch is exposed to a significant amount of UV rays, the darker it becomes until it becomes opaque, allowing the needles to appear clearly in contrast to the opaque dial of the watch.

La première valeur seuil et la deuxième valeur seuil dépendent du ou des matériaux choisis pour la plaque photochromique.The first threshold value and the second threshold value depend on the material or materials chosen for the photochromic plate.

La montre selon le premier aspect de l'invention peut également présenter une ou plusieurs des caractéristiques ci-après prises individuellement ou selon toutes les combinaisons techniquement possibles :

  • la plaque photochromique peut être une plaque d'un matériau transparent aux rayons UV comportant dans sa masse des inclusions de matières photochromiques ;
  • la plaque photochromique peut être une plaque d'un matériau transparent revêtu par une couche photochromique sous la forme d'un film polymère incluant de la matière photochromique ou d'un peinture incluant des pigments de matière photochromique ;
  • le matériau transparent aux rayons UV peut être un verre minéral ;
  • le matériau transparent aux rayons UV peut être un verre organique ;
  • le matériau transparent peut être une résine organique, typiquement une résine acrylique ou une résine polycarbonate transparente au rayonnement UV ;
  • les inclusions photochromiques peuvent être, de préférence dans le cas de verres minéraux, des inclusions d'un composé d'halogénure d'argent et/ou de bromure d'argent ;
  • les inclusions photochromiques peuvent être de préférence dans le cas de verres organiques, typiquement en résine synthétique de préférence en résine acrylique ou en résine polycarbonate des inclusions de molécules d'oxazines et/ou de de composés de de naphtopyrane.
  • la plaque photosensible peut comporter une inscription imprimée ou gravée sur au moins une de ces faces ;
  • le cadran peut présenter une teinte noire lorsque la plaque photochromique est exposée à une quantité de rayons UV supérieure à la deuxième valeur seuil, de façon à rendre l'heure plus lisible ;
  • la ou les aiguille(s) peut (peuvent) être blanche(s) de façon à être plus visible(s) lorsque le cadran s'obscurcit.
The watch according to the first aspect of the invention may also have one or more of the following features taken individually or in any technically possible combination:
  • the photochromic plate may be a plate of a material transparent to UV rays comprising in its mass inclusions of photochromic materials;
  • the photochromic plate may be a plate of a transparent material coated with a photochromic layer in the form of a film polymer including photochromic material or paint including photochromic material pigments;
  • the UV-transparent material may be a mineral glass;
  • the UV-transparent material may be an organic glass;
  • the transparent material may be an organic resin, typically an acrylic resin or a polycarbonate resin transparent to UV radiation;
  • the photochromic inclusions may be, preferably in the case of inorganic glasses, inclusions of a silver halide compound and / or silver bromide;
  • the photochromic inclusions may preferably be in the case of organic glasses, typically synthetic resin, preferably acrylic resin or polycarbonate resin inclusions of oxazine molecules and / or naphthopyran compounds.
  • the photosensitive plate may comprise an inscription printed or engraved on at least one of these faces;
  • the dial may have a black hue when the photochromic plate is exposed to a greater amount of UV radiation than the second threshold value, so as to make the time more readable;
  • the needle (s) may be white (s) so as to be more visible when the dial darkens.

Description sommaire des dessinsBrief description of the drawings

D'autres particularités et avantages ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 représente une vue schématique en demi-coupe d'une montre selon un mode de réalisation de l'invention ;
  • la figure 2 représente une vue schématique de dessus de la montre de la figure 1 lorsqu'elle est exposée à une quantité d'UV inférieure à une première valeur seuil ;
  • la figure 3 représente une vue schématique de dessus de la montre de la figure 1 lorsqu'elle est exposée à une quantité d'UV comprise entre la première valeur seuil et une deuxième valeur seuil ;
  • la figure 4 représente une vue schématique de dessus de la montre de la figure 1 lorsqu'elle est exposée à une quantité d'UV supérieure à la deuxième valeur seuil.
Other particularities and advantages will emerge clearly from the description which is given hereinafter, by way of indication and in no way limiting, with reference to the appended drawings, in which:
  • the figure 1 is a schematic half-sectional view of a watch according to one embodiment of the invention;
  • the figure 2 represents a schematic view from above of the watch of the figure 1 when exposed to an amount of UV less than a first threshold value;
  • the figure 3 represents a schematic view from above of the watch of the figure 1 when exposed to a UV amount between the first threshold value and a second threshold value;
  • the figure 4 represents a schematic view from above of the watch of the figure 1 when exposed to an amount of UV greater than the second threshold value.

Description détaillée d'un mode de réalisationDetailed description of an embodiment

Une montre 1 selon un mode de réalisation de l'invention va maintenant être décrite en référence aux figures 1 à 4.A watch 1 according to one embodiment of the invention will now be described with reference to Figures 1 to 4 .

Cette montre 1 comporte une boite de montre 2 qui contient un mouvement horloger 3. La boîte 2 comprend une carrure 2a, un premier et un deuxième élément de fermeture de la boîte, respectivement une glace 5 et un fond F. La carrure 16 est munie de quatre cornes de fixation du bracelet B. Le fond F est fixé à la carrure 2a au moyen de vis non représentées au dessin et la glace 5 est chassée classiquement dans un dégagement de la carrure avec interposition d'un joint d'étanchéité. La glace est réalisée dans un matériau transparent aux rayons UV.This watch 1 comprises a watch case 2 which contains a watch movement 3. The box 2 comprises a middle part 2a, a first and a second closure element of the box, respectively an ice cream 5 and a bottom F. The middle part 16 is provided with four bases for fixing the bracelet B. The bottom F is fixed to the middle 2a by means of screws not shown in the drawing and the ice 5 is driven conventionally in a clearance of the middle part with the interposition of a seal. The ice is made of a material transparent to UV rays.

Le mouvement horloger 3 permet d'entraîner en rotation des aiguilles 4. La montre 1 comporte également un cadran 5. Le cadran 5 ferme la boite de montre 2. Le cadran 5 est disposé directement au-dessus du mouvement horloger 3. Le cadran 5 est donc intercalé entre le mouvement horloger 3 et les aiguilles 4.The watch movement 3 makes it possible to rotate the needles 4. The watch 1 also comprises a dial 5. The dial 5 closes the watch case 2. The dial 5 is placed directly above the watch movement 3. The dial 5 is interposed between the watch movement 3 and the needles 4.

Les aiguilles 4 présentent de préférence une teinte claire, typiquement du blanc, de façon à être plus visibles sur le cadran.Needles 4 preferably have a light shade, typically white, so as to be more visible on the dial.

Le cadran 5 est formé d'une plaque photochromique 6 disposée directement au-dessus du mouvement horloger 3 et directement en-dessous des aiguilles 4. La plaque photochromique 6 comporte une plaque d'un matériau transparent dans lequel sont incluses des substances photochromiques ou qui est revêtu par un revêtement contenant des substances photochromiques.The dial 5 is formed of a photochromic plate 6 disposed directly above the watch movement 3 and directly below the needles 4. The photochromic plate 6 comprises a plate of a transparent material in which are included photochromic substances or which is coated with a coating containing photochromic substances.

La plaque photochromique 6 s'obscurcit sous l'effet du rayonnement UV et elle s'éclaircit sous l'effet de la chaleur ambiante et ce, de manière indéfiniment réversible. Ce phénomène est obtenu par l'activation de molécules de substances photochromiques. L'absorption de la plaque photochromique est déterminée à tout instant par l'équilibre entre le nombre de molécules photosensibles activées par la stimulation UV et le nombre de molécules désactivées par la chaleur.The photochromic plate 6 darkens under the effect of UV radiation and clears under the effect of ambient heat indefinitely reversible. This phenomenon is obtained by the activation of molecules of photochromic substances. Absorption of the photochromic plate is determined at all times by the balance between the number of photosensitive molecules activated by UV stimulation and the number of molecules deactivated by heat.

Selon un mode de réalisation, la plaque photochromique 6 est formée d'une résine synthétique de préférence une résine polycarbonate ou une résine acrylique transparente aux rayons UV dans laquelle sont dispersées dans la masse des molécules d'oxazines et/ou de composés de naphtopyrane. Typiquement l'épaisseur de la plaque est de l'ordre de 0,85 mm.According to one embodiment, the photochromic plate 6 is formed of a synthetic resin, preferably a polycarbonate resin or a UV-transparent acrylic resin in which oxazine molecules and / or naphthopyran compounds are dispersed in the mass. Typically the thickness of the plate is of the order of 0.85 mm.

Selon une variante la plaque photochromique est une plaque d'un matériau transparent aux rayonnements revêtu par une couche photochromique sous forme d'un film polymère incluant de la matière photochromique identique à celle décrite dans le paragraphe ci-dessus.According to a variant, the photochromic plate is a plate of a material transparent to the radiation coated with a photochromic layer in the form of a polymer film including photochromic material identical to that described in the paragraph above.

Le phénomène d'assombrissement et d'éclaircissement de ce type de plaque est bien connu et résulte respectivement de la cassure sous l'effet des rayons l'UV des molécules d'oxazines et/ou de composés de naphtopyrane et de leur reconstitution quand l'UV a disparu.The phenomenon of darkening and lightening of this type of plate is well known and results respectively from the breaking under the effect of the UV rays of the oxazine molecules and / or naphthopyran compounds and their reconstitution when the 'UV is gone.

Selon une autre variante la plaque photochromique est un verre minéral dans laquelle les inclusions photochromiques sont des inclusions d'un composé d'halogénure d'argent et/ou de bromure d'argent. Dans ce cas, sous exposition aux UV, les liaisons argent - halogénure /bromure se cassent et les atomes d'argent s'associent entre eux ce qui assombrit la plaque. Les liaisons argent - halogénure se reconstituent dès l'arrêt de l'exposition aux UV, redonnant sa clarté à la plaque.According to another variant, the photochromic plate is a mineral glass in which the photochromic inclusions are inclusions of a silver halide compound and / or silver bromide. In this case, under UV exposure, the silver-halide / bromide bonds break and the silver atoms associate with each other, which darkens the plate. The silver - halide bonds are reconstituted as soon as UV exposure stops, restoring clarity to the plaque.

Par ailleurs, une inscription 7 peut être gravée ou imprimée sur le cadran.Moreover, an inscription 7 can be engraved or printed on the dial.

Les figures 2 à 4 représentent l'évolution de la teinte du cadran 5 en fonction de son exposition aux rayons UV.The Figures 2 to 4 represent the evolution of the hue of the dial 5 as a function of its exposure to UV rays.

Ainsi, la figure 2 représente la montre lorsqu'elle n'est pas exposée à des rayons UV. Comme on peut le voir sur cette figure, le cadran est alors transparent de sorte que le mouvement horloger est visible à travers le cadran.So, the figure 2 represents the watch when it is not exposed to UV rays. As can be seen in this figure, the dial is then transparent so that the watch movement is visible through the dial.

La figure 3 représente la montre lorsqu'elle est exposée à une faible quantité d'UV. Cette quantité d'UV est typiquement comprise entre la première valeur seuil et la deuxième valeur seuil. Dans ce cas, le cadran est partiellement obscurci, de sorte que le mouvement horloger est partiellement visible à travers le cadran. En outre, les aiguilles 4 et l'inscription 7 commencent à ressortir par contraste de façon à être lisible malgré l'augmentation de la luminosité. En effet, l'obscurcissement du cadran permet de limiter les reflets liés au mouvement horloger.The figure 3 represents the watch when exposed to a small amount of UV. This amount of UV is typically between the first threshold value and the second threshold value. In this case, the dial is partially obscured, so that the watch movement is partially visible through the dial. In addition, the needles 4 and the inscription 7 begin to stand out in contrast so as to be readable despite the increase in brightness. Indeed, the darkening of the dial limits the reflections related to the watch movement.

La figure 4 représente la montre lorsqu'elle est exposée à une quantité d'UV supérieure à la deuxième quantité seuil. Dans ce cas, le cadran a pris une teinte foncée de sorte qu'il masque complètement le mouvement horloger. Les aiguilles 4 et l'inscription 7 sont alors très visibles, malgré une luminosité forte.The figure 4 represents the watch when it is exposed to a quantity of UV greater than the second threshold quantity. In this case, the dial has taken a dark hue so that it completely masks the watch movement. Needles 4 and the inscription 7 are then very visible, despite a strong luminosity.

Naturellement, l'invention n'est pas limitée aux modes de réalisation décrits en référence aux figures et des variantes pourraient être envisagées sans sortir du cadre de l'invention. Ainsi, des index pourraient par exemple être gravés ou imprimés sur la plaque photochromique, ce qui permettrait d'avoir une montre squelette avec des index visibles tout en se passant de rehaut. Le cadran pourrait également présenter d'autres formes que celle représentée.Naturally, the invention is not limited to the embodiments described with reference to the figures and variants could be envisaged without departing from the scope of the invention. Thus, indexes could for example be engraved or printed on the photochromic plate, which would make it possible to have a skeleton watch with visible indexes while passing by flushing. The dial could also have other forms than the one shown.

Claims (9)

Montre (1) comportant un mouvement horloger (3) logé dans une boite de montre (2) formée d'une carrure d'une glace et d'un fond, le mouvement horloger (3) étant agencé pour entraîner en rotation au moins une aiguille (4), le mouvement horloger (3) étant recouvert par un cadran (5) visible à travers la glace, le cadran (5) étant disposé entre le mouvement horloger (3) et ladite au moins une aiguille (4), ladite montre étant caractérisée en ce que la glace est transparente aux rayons UV et en ce que le cadran (5) est constitué d'une plaque photochromique (6) de façon à ce que : - le mouvement horloger (3) soit apparent lorsque la plaque photochromique (6) est exposée à une quantité de rayons UV inférieure à une première valeur seuil ; - le mouvement horloger (3) soit masqué lorsque la plaque photochromique (6) est exposée à une quantité de rayons UV supérieure à une deuxième valeur seuil. Watch (1) comprising a watch movement (3) housed in a watch case (2) formed of a middle of an ice and a bottom, the watch movement (3) being arranged to drive in rotation at least one needle (4), the watch movement (3) being covered by a dial (5) visible through the glass, the dial (5) being disposed between the watch movement (3) and said at least one needle (4), said watch being characterized in that the ice is transparent to UV rays and in that the dial (5) consists of a photochromic plate (6) so that: the watch movement (3) is apparent when the photochromic plate (6) is exposed to a quantity of UV rays less than a first threshold value; the watch movement (3) is masked when the photochromic plate (6) is exposed to a quantity of UV rays greater than a second threshold value. Montre (1) selon la revendication 1, dans laquelle la plaque photochromique (6) est une plaque d'un matériau transparent aux rayons UV comportant dans sa masse des inclusions de matières photochromiques.Watch (1) according to claim 1, wherein the photochromic plate (6) is a plate of a material transparent to UV rays comprising in its mass inclusions of photochromic material. Montre (1) selon la revendication 1, dans laquelle la plaque photochromique (6) est une plaque d'un matériau transparent revêtu par une couche photochromique sous forme d'un film polymère incluant de la matière photochromique.Watch (1) according to claim 1, wherein the photochromic plate (6) is a plate of a transparent material coated with a photochromic layer in the form of a polymer film including photochromic material. Montre (1) selon l'une des revendications 2 ou 3, dans laquelle le matériau transparent aux rayons UV est un verre minéral.Watch (1) according to one of claims 2 or 3, wherein the UV-transparent material is a mineral glass. Montre (1) selon l'une des revendications 2 ou 3, dans laquelle le matériau transparent aux rayons UV est un verre organique.Watch (1) according to one of claims 2 or 3, wherein the UV-transparent material is an organic glass. Montre (1) selon la revendication 5, dans laquelle le matériau transparent est une résine synthétique de préférence une résine polycarbonate ou une résine acrylique transparente aux rayons UV.Watch (1) according to claim 5, wherein the transparent material is a synthetic resin preferably a polycarbonate resin or a UV-transparent acrylic resin. Montre (1) selon la revendication 2 et la revendication 4, dans laquelle les inclusions photochromiques sont des inclusions d'un composé d'halogénure d'argent et/ou de bromure d'argent.Watch (1) according to claim 2 and claim 4, wherein the photochromic inclusions are inclusions of a silver halide compound and / or silver bromide. Montre (1) selon la revendication 2 ou 3 et la revendication 5, dans laquelle les inclusions photochromiques sont des inclusions de molécules d'oxazines et/ou de composés de naphtopyraneWatch (1) according to claim 2 or 3 and claim 5, wherein the photochromic inclusions are inclusions of oxazine molecules and / or naphthopyran compounds Montre (1) selon l'une des revendications précédentes, dans laquelle la plaque photosensible (6) comporte une inscription imprimée ou gravée sur au moins une de ces faces.Watch (1) according to one of the preceding claims, wherein the photosensitive plate (6) has an inscription printed or engraved on at least one of these faces.
EP17162066.9A 2017-03-21 2017-03-21 Skeleton watch with photochromic dial Withdrawn EP3379345A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP17162066.9A EP3379345A1 (en) 2017-03-21 2017-03-21 Skeleton watch with photochromic dial
KR1020197027512A KR102250026B1 (en) 2017-03-21 2018-03-07 Skeleton watch with photochromic dial
EP18707934.8A EP3602205B1 (en) 2017-03-21 2018-03-07 Skeleton watch with photochromic dial
CN202410547450.6A CN118244600A (en) 2017-03-21 2018-03-07 Hollowed-out watch with photochromic dial
JP2019572283A JP6765018B2 (en) 2017-03-21 2018-03-07 clock
US16/495,168 US11422509B2 (en) 2017-03-21 2018-03-07 Watch
CN201880019275.6A CN110431493A (en) 2017-03-21 2018-03-07 Hollow out table with photochromic dial plate
PCT/EP2018/055530 WO2018172068A1 (en) 2017-03-21 2018-03-07 Skeleton watch with photochromic dial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17162066.9A EP3379345A1 (en) 2017-03-21 2017-03-21 Skeleton watch with photochromic dial

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EP3379345A1 true EP3379345A1 (en) 2018-09-26

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EP17162066.9A Withdrawn EP3379345A1 (en) 2017-03-21 2017-03-21 Skeleton watch with photochromic dial
EP18707934.8A Active EP3602205B1 (en) 2017-03-21 2018-03-07 Skeleton watch with photochromic dial

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US (1) US11422509B2 (en)
EP (2) EP3379345A1 (en)
JP (1) JP6765018B2 (en)
KR (1) KR102250026B1 (en)
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WO (1) WO2018172068A1 (en)

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Also Published As

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CN110431493A (en) 2019-11-08
WO2018172068A1 (en) 2018-09-27
JP2020511676A (en) 2020-04-16
US11422509B2 (en) 2022-08-23
EP3602205B1 (en) 2021-05-05
EP3602205A1 (en) 2020-02-05
KR20190117701A (en) 2019-10-16
KR102250026B1 (en) 2021-05-10
JP6765018B2 (en) 2020-10-07
US20200409309A1 (en) 2020-12-31
CN118244600A (en) 2024-06-25

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