EP2989507B1 - Timepiece including a digital device for displaying information - Google Patents

Timepiece including a digital device for displaying information Download PDF

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Publication number
EP2989507B1
EP2989507B1 EP14702618.1A EP14702618A EP2989507B1 EP 2989507 B1 EP2989507 B1 EP 2989507B1 EP 14702618 A EP14702618 A EP 14702618A EP 2989507 B1 EP2989507 B1 EP 2989507B1
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EP
European Patent Office
Prior art keywords
solar cell
plate
dial
digital information
display device
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.)
Active
Application number
EP14702618.1A
Other languages
German (de)
French (fr)
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EP2989507A1 (en
Inventor
Fabian Dubois
Jean Laconte
Martin Jufer
Stéphane Leoni
Marc Schlappach
Mile Vidovic
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.)
ETA Manufacture Horlogere Suisse SA
Original Assignee
ETA Manufacture Horlogere Suisse SA
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.)
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Publication date
Application filed by ETA Manufacture Horlogere Suisse SA filed Critical ETA Manufacture Horlogere Suisse SA
Priority to EP15202670.4A priority Critical patent/EP3037900B1/en
Priority to EP14702618.1A priority patent/EP2989507B1/en
Publication of EP2989507A1 publication Critical patent/EP2989507A1/en
Application granted granted Critical
Publication of EP2989507B1 publication Critical patent/EP2989507B1/en
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G17/00—Structural details; Housings
    • G04G17/02—Component assemblies
    • G04G17/04—Mounting of electronic components
    • G04G17/045—Mounting of the display
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C10/00—Arrangements of electric power supplies in time pieces
    • G04C10/02—Arrangements of electric power supplies in time pieces the power supply being a radioactive or photovoltaic source
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0023—Visual time or date indication means by light valves in general
    • G04G9/0029—Details
    • G04G9/0035—Details constructional

Definitions

  • the present invention relates to a timepiece comprising a digital information display device. More specifically, the invention relates to such a timepiece in which the digital display of information is more aesthetic and easier to read.
  • Wristwatches equipped with a digital information display device such as a liquid crystal cell have been known for a long time.
  • Such wristwatches typically include a dial under and away from which is arranged for example a liquid crystal cell.
  • a window in the dial of the watch allows the user to read hourly or other information displayed by the liquid crystal cell.
  • the liquid crystal cell is fixed on a platen housed in the watch case remote from the dial. There is therefore an unsightly gap between the surface of the dial and the display surface of the liquid crystal cell.
  • his vision may be impeded by the shadow projected by the edges of the window on the display surface of the liquid crystal cell.
  • liquid crystal cells that equip the wristwatches of the type described above most often comprise glass substrates joined together by means of a sealing frame.
  • These glass substrates are usually of square or rectangular shape because, even if it is technically possible to give such glass substrates shapes that deviate from the square or rectangular shape, this is hardly possible from a point of view. economic view.
  • the document DE 198 57 997 discloses a dial under the surface of which are simultaneously attached a liquid crystal cell and a solar cell.
  • the present invention aims to overcome the problems mentioned above as well as others by providing a timepiece provided with a digital information display device in which the display of information is more aesthetic and More legible.
  • the present invention relates to a display module for a timepiece, as defined in independent claim 1.
  • the present invention proceeds from the general inventive idea which consists, in the case of a timepiece comprising a dial on the underside of which is fixed a digital information display device, to removably accommodate a cell solar in a platinum arranged under the dial.
  • a timepiece comprising a dial on the underside of which is fixed a digital information display device
  • a cell solar in a platinum arranged under the dial.
  • the figure 1 is a perspective view and exploded of a first embodiment of a display module for a timepiece according to the invention.
  • this display module comprises a dial 2 which, in the example shown, is of generally circular shape. However, it will be understood that the shape of the dial may deviate from a circular profile and may be for example square or rectangular.
  • the dial 2 has an upper face 4 and a lower face 6 and is pierced with a hole 8 at its center for the passage of a set of axes of the minute and second hands (not shown in the drawing).
  • a window 10 is provided in the dial 2.
  • the decorative layer whose dial 2 is coated is omitted at the location corresponding to the window 10. Another solution to form the window 10 is to pierce the dial 2 at the desired location.
  • the display module 1 also comprises a digital information display device.
  • this digital information display device consists of a flexible liquid crystal display cell 12 which has a substantially semicircular shape.
  • This liquid crystal display cell 12 comprises a front substrate 14 which defines an upper display surface and a rear substrate 16.
  • the front 14 and rear 16 substrates are made of a flexible plastic material and are conventionally connected between them by a sealing frame (not visible in the drawing) which delimits a closed volume for the confinement of the liquid crystal.
  • a flexible electrical connector 18 connects the electrodes of the liquid crystal display cell 12 to an electronic control circuit (not shown).
  • the front substrate 14 of the liquid crystal display cell 12 is coated with an adhesive layer 20 formed of an optically transparent adhesive and through which the liquid crystal display cell 12 is applied against the lower face 6 of the dial 2.
  • the liquid crystal display cell 12 is mechanically laminated against the lower face 6 of the dial 2, then the assembly formed by the dial 2 and the cell liquid crystal display 12 is passed through an autoclave in order to expel the air possibly trapped between the adhesive layer 20 and the dial 2.
  • the pressure in the autoclave is 6 bar
  • the temperature of the treatment is of the order of 50 ° C
  • the treatment time is about 30 min.
  • the assembly is completed by a first solar cell 22.
  • this solar cell 22 corresponds to the preferred embodiment of the invention but that, in the basic variant of the invention, the display module 1 includes only the dial 2 and the liquid crystal display cell 12.
  • the solar cell 22 has a substantially semicircular shape complementary to the shape of the liquid crystal display cell 12. The sum of the area of the liquid crystal display cell 12 and the solar cell 22 substantially corresponds to that of the dial 2.
  • the solar cell 22 is arranged under and at a short distance from the dial 2. For this purpose, it is received in a plate 24 which is adapted in shape and dimensions to those of the dial 2.
  • the plate 24 comprises a bearing surface 26 whose area is substantially equal to that of the solar cell 22.
  • the solar cell 22 is provided along its outer perimeter of at least one and, preferably two pins 28 which are engaged in two corresponding housings 30 provided on the periphery of the plate 24.
  • the bearing surface 26 is pierced with two diametrically opposite through holes 32 in which are engaged springs 34 which ensure electrical contact between the two terminals of the solar cell 22 and the power supply circuit of the watch (not shown).
  • the assembly formed by the dial 2 and the liquid crystal display cell 12 is disposed above the solar cell 22 and bears on a peripheral rim 36 of the plate 24. It can be seen that the display cell liquid crystal 12 is located above an opening 38 formed in the plate 24 and whose extent substantially corresponds to the surface of the liquid crystal display cell 12. This opening 38 allows a backlight device 40 mounted from below the plate 24 to illuminate the liquid crystal display cell 12 from the rear.
  • the assembly formed by the dial 2, the liquid crystal display cell 12 and the solar cell 22 is detachably immobilized on the plate 24 by means of flexible locking hooks 42.
  • a module of FIG. 1 complete display that can be exchanged piece for room in case of malfunction. In case of problems, it is even possible to remove the display module 1 and not replace only the defective component (s), which is very advantageous from an economic point of view.
  • FIG 2 is a perspective and exploded view of a second exemplary embodiment of a display module for a timepiece according to the invention.
  • elements identical or similar to those already described in connection with the figure 1 will be designated by the same numerical references.
  • the dial 2 comprises a window 10 adapted in shape and dimensions to the shape and dimensions of the front substrate 14 which defines the upper display surface of the liquid crystal display cell 12.
  • a second solar cell 220 has substantially the same dimensions as the dial 2 and is provided with an opening 221 in which is housed the liquid crystal display cell 12 when the solar cell 220 is disposed under the dial 2. It is understood that when the Under the dial 2 there is a solar cell of the same dimensions as the dial 2, a portion of the surface of the solar cell will be masked by the liquid crystal display cell 12. It has been realized that the photovoltaic conversion efficiency of a given active surface solar cell is worse when the solar cell is partially obscured than when the active surface of the solar cell is reduced due to the resent of a shape opening in which the digital information display device is housed.
  • the display module illustrated in the figure 2 is identical to that described above in connection with the figure 1 .
  • the liquid crystal display cell 12 is fixed on the lower face 6 of the dial 2 preferably by rolling and the solar cell 220 is received in the plate 24. Subsequently, the assembly formed by the dial 2 and the cell
  • the liquid crystal display 12 is disposed above the solar cell 220, so that the solar cell 220 is under and at a short distance from the dial 2 and the liquid crystal display cell 12 is housed in the cell. opening 221.
  • a Backlight device 40 mounted below the plate 24 makes it possible to illuminate the liquid crystal display cell 12 from the rear through the opening 38 formed in the plate 24.
  • the assembly formed by the dial 2, the liquid crystal display cell 12 and the solar cell 220 are removably attached to the plate 24 by means of a plurality of flexible locking hooks 42.
  • the bearing surface 26 is pierced with two through-holes 32 placed close to one another on a diameter portion of the bearing surface 26 in which springs 34 are engaged. which make it possible to ensure the electrical contact between the two terminals of the solar cell 220 and the electric supply circuit of the watch (not shown).
  • the solar cell 220 is provided on its device with at least one and, preferably, three notches 44 which cooperate with three corresponding pins 46 of the plate 24.
  • the dial 2 In the case where the timepiece is of the solar watch type, the dial 2 must be at least partially transparent in order to let a sufficient amount of light to allow the solar cell 22, 220 to effectively recharge the battery of the shows while masking the solar cell 22, 220 with regard to the wearer.
  • the dial 2 can be made of a transparent plastic material and be covered with a layer of paint whose opacity is adjusted according to the thickness of the paint layer and / or the concentration of the pigments in the paint.
  • the transmittance of a dial 2 of transparent plastic covered with paint is of the order of 45%. In other words, 45% of the incident light is transmitted to the solar cell 22, 220 and the rest of the light is absorbed by the dial 2, which is sufficient to mask the solar cell 22, 220 with respect to the user.
  • the plastic dial 2 may be covered with a layer of mother-of-pearl whose thickness is typically 150 ⁇ m ⁇ 20 ⁇ m and whose transmittance is adjusted to 35%. Layer mother-of-pearl is fixed on the upper surface 4 of the dial 2 by means of an optically transparent adhesive layer.
  • the plastic dial 2 it is sought to confer on the plastic dial 2 an appearance of composite material of the carbon fiber type. It is known that such a composite material is obtained by means of interleaved carbon fibers which are impregnated with resin, the surface state of the resulting material having slightly raised areas which are repeated periodically.
  • the first solution consists in machining in the inner wall of the mold into which the plastics material is injected structures which will form as many zones in relief on the surface of the dial 2.
  • the second solution uses the principle of a conventional pad printing (decal with cliché) or an electronic printing that is also possible from a technical point of view but whose rendering for the eye is however a little less good.
  • the carbon effect is obtained by the alternating and periodic repetition of horizontal lines 48 and vertical lines 50. Even if the horizontal lines 48 seem brighter, this is only due to the angle of incidence of light. This effect makes the dial “live” depending on the light and it's exactly the same with real carbon.
  • the lines are black (horizontal lines and vertical lines). We could also use a mixture of black (vertical lines) and gray (horizontal lines) to obtain the carbon effect, but in this case it would be independent of light and quite static.
  • the liquid crystal display cell 12 and the first solar cell 22 each have a clearance, respectively 52 and 54, for the passage of the hour and minute pin axes.
  • a through hole 56 is formed on the edge of the bearing surface 26 of the plate 24 and the backlight device 40 is pierced with a hole 58.
  • the second solar cell 220 is pierced with a hole 60 at its center and the plate 24 is provided with a hole 62 defined by a guide flange 64.

Description

La présente invention concerne une pièce d'horlogerie comprenant un dispositif numérique d'affichage d'informations. Plus précisément, l'invention concerne une telle pièce d'horlogerie dans laquelle l'affichage numérique des informations est plus esthétique et plus facilement lisible.The present invention relates to a timepiece comprising a digital information display device. More specifically, the invention relates to such a timepiece in which the digital display of information is more aesthetic and easier to read.

Des montres-bracelets munies d'un dispositif numérique d'affichage d'informations tel qu'une cellule à cristal liquide sont connues de longue date. De telles montres-bracelets comprennent typiquement un cadran sous et à distance duquel est disposée par exemple une cellule à cristal liquide. Un guichet ménagé dans le cadran de la montre permet à l'utilisateur de lire les informations horaires ou autres affichées par la cellule à cristal liquide. La cellule à cristal liquide est fixée sur une platine logée dans la boîte de montre à distance du cadran. Il y a donc un espace inesthétique entre la surface du cadran et la surface d'affichage de la cellule à cristal liquide. En outre, selon l'angle sous lequel l'utilisateur regarde sa montre, sa vision peut être gênée par l'ombre projetée par les bords du guichet sur la surface d'affichage de la cellule à cristal liquide.Wristwatches equipped with a digital information display device such as a liquid crystal cell have been known for a long time. Such wristwatches typically include a dial under and away from which is arranged for example a liquid crystal cell. A window in the dial of the watch allows the user to read hourly or other information displayed by the liquid crystal cell. The liquid crystal cell is fixed on a platen housed in the watch case remote from the dial. There is therefore an unsightly gap between the surface of the dial and the display surface of the liquid crystal cell. In addition, depending on the angle at which the user looks at his watch, his vision may be impeded by the shadow projected by the edges of the window on the display surface of the liquid crystal cell.

Par ailleurs, les cellules à cristal liquide qui équipent les montres-bracelets du type décrit ci-dessus comprennent le plus souvent des substrats de verre réunis entre eux au moyen d'un cadre de scellement. Ces substrats de verre sont habituellement de forme carrée ou rectangulaire car, même s'il est techniquement possible de donner à de tels substrats de verre des formes qui s'écartent de la forme carrée ou rectangulaire, cela est difficilement envisageable d'un point de vue économique.Furthermore, the liquid crystal cells that equip the wristwatches of the type described above most often comprise glass substrates joined together by means of a sealing frame. These glass substrates are usually of square or rectangular shape because, even if it is technically possible to give such glass substrates shapes that deviate from the square or rectangular shape, this is hardly possible from a point of view. economic view.

Le document DE 198 57 997 divulgue un cadran sous la surface duquel sont simultanément fixées une cellule à cristal liquide et une cellule solaire.The document DE 198 57 997 discloses a dial under the surface of which are simultaneously attached a liquid crystal cell and a solar cell.

La présente invention a pour but de pallier les problèmes mentionnés ci-dessus ainsi que d'autres encore en procurant une pièce d'horlogerie munie d'un dispositif numérique d'affichage d'informations dans laquelle l'affichage des informations est plus esthétique et plus lisible.The present invention aims to overcome the problems mentioned above as well as others by providing a timepiece provided with a digital information display device in which the display of information is more aesthetic and More legible.

A cet effet, la présente invention concerne un module d'affichage pour une pièce d'horlogerie, tel que défini dans la revendication indépendante 1.For this purpose, the present invention relates to a display module for a timepiece, as defined in independent claim 1.

On obtient ainsi un module d'affichage complet qui peut être échangé pièce pour pièce en cas de dysfonctionnement. En cas de problème, il est même possible de déposer le module d'affichage et de ne remplacer que le (ou les) composant(s) défectueux, ce qui est très avantageux d'un point de vue économique.This gives a complete display module that can be exchanged piece for room in case of malfunction. In case of problems, it is even possible to remove the display module and replace only the component (s) defective, which is very advantageous from an economic point of view.

D'autres caractéristiques et avantages de la présente invention ressortiront plus clairement de la description détaillée qui suit d'un exemple de réalisation de la pièce d'horlogerie selon l'invention, cet exemple étant donné à titre purement illustratif et non limitatif seulement en liaison avec le dessin annexé sur lequel :

  • la figure 1 est une vue en perspective et en éclaté d'un premier mode de réalisation de la pièce d'horlogerie selon l'invention ;
  • la figure 2 est une vue en perspective et en éclaté d'un second mode de réalisation de la pièce d'horlogerie selon l'invention, et
  • les figures 3A et 3B sont respectivement des vues d'ensemble et de détail à plus grande échelle d'un cadran en plastique auquel est conféré un aspect de matériau composite du type fibre de carbone.
Other features and advantages of the present invention will emerge more clearly from the detailed description which follows of an exemplary embodiment of the timepiece according to the invention, this example being given for purely illustrative and nonlimiting purposes only in connection with the attached drawing in which:
  • the figure 1 is a perspective and exploded view of a first embodiment of the timepiece according to the invention;
  • the figure 2 is a perspective and exploded view of a second embodiment of the timepiece according to the invention, and
  • the Figures 3A and 3B are respectively larger scale and overall views of a plastic dial which is imparted an aspect of composite material of the carbon fiber type.

La présente invention procède de l'idée générale inventive qui consiste, dans le cas d'une pièce d'horlogerie comprenant un cadran sur la face inférieure duquel est fixé un dispositif numérique d'affichage d'informations, à loger de manière amovible une cellule solaire dans une platine disposée sous le cadran. En cas de panne du dispositif numérique d'affichage d'informations ou de la cellule solaire, il est possible de déposer le module d'affichage et de ne remplacer que le (ou les) composant(s) défectueux, ce qui est très avantageux d'un point de vue économique. En particulier, en cas de panne de la cellule solaire, on évite de devoir déposer le cadran qui est une pièce coûteuse.The present invention proceeds from the general inventive idea which consists, in the case of a timepiece comprising a dial on the underside of which is fixed a digital information display device, to removably accommodate a cell solar in a platinum arranged under the dial. In case of failure of the digital information display device or the solar cell, it is possible to remove the display module and replace only the (or) component (s) defective, which is very advantageous from an economic point of view. In particular, in case of failure of the solar cell, it avoids having to remove the dial which is an expensive part.

La figure 1 est une vue en perspective et en éclaté d'un premier exemple de réalisation d'un module d'affichage pour une pièce d'horlogerie selon l'invention. Désigné dans son ensemble par la référence numérique générale 1, ce module d'affichage comprend un cadran 2 qui, dans l'exemple illustré, est de forme générale circulaire. On comprendra cependant que la forme du cadran peut s'écarter d'un profil circulaire et peut être par exemple carrée ou bien rectangulaire. Le cadran 2 présente une face supérieure 4 et une face inférieure 6 et est percé d'un trou 8 en son centre pour le passage d'un jeu d'axes des aiguilles de minutes et de secondes (non représentés au dessin). Un guichet 10 est ménagé dans le cadran 2. Dans le cas où le cadran 2 est réalisé en un matériau transparent, la couche décorative dont le cadran 2 est revêtu est omise à l'endroit correspondant au guichet 10. Une autre solution pour former le guichet 10 consiste à percer le cadran 2 à l'endroit souhaité.The figure 1 is a perspective view and exploded of a first embodiment of a display module for a timepiece according to the invention. Designated as a whole by the general numerical reference 1, this display module comprises a dial 2 which, in the example shown, is of generally circular shape. However, it will be understood that the shape of the dial may deviate from a circular profile and may be for example square or rectangular. The dial 2 has an upper face 4 and a lower face 6 and is pierced with a hole 8 at its center for the passage of a set of axes of the minute and second hands (not shown in the drawing). A window 10 is provided in the dial 2. In the case where the dial 2 is made of a transparent material, the decorative layer whose dial 2 is coated is omitted at the location corresponding to the window 10. Another solution to form the window 10 is to pierce the dial 2 at the desired location.

Le module d'affichage 1 comprend également un dispositif numérique d'affichage d'informations. Dans l'exemple représenté au dessin, ce dispositif numérique d'affichage d'informations est constitué d'une cellule d'affichage à cristal liquide souple 12 qui présente une forme sensiblement en demi-cercle. Cette cellule d'affichage à cristal liquide 12 comprend un substrat avant 14 qui définit une surface supérieure d'affichage et un substrat arrière 16. Les substrats avant 14 et arrière 16 sont réalisés au moyen d'un matériau plastique souple et sont classiquement reliés entre eux par un cadre de scellement (non visible au dessin) qui délimite un volume clos pour le confinement du cristal liquide. Il va de soi que cet exemple est donné à titre purement illustratif seulement et que le dispositif numérique d'affichage d'informations peut être de type électrophorétique ou bien encore utiliser une encre électronique. Un connecteur électrique souple 18 permet de relier les électrodes de la cellule d'affichage à cristal liquide 12 à un circuit électronique de commande (non représenté).The display module 1 also comprises a digital information display device. In the example shown in drawing, this digital information display device consists of a flexible liquid crystal display cell 12 which has a substantially semicircular shape. This liquid crystal display cell 12 comprises a front substrate 14 which defines an upper display surface and a rear substrate 16. The front 14 and rear 16 substrates are made of a flexible plastic material and are conventionally connected between them by a sealing frame (not visible in the drawing) which delimits a closed volume for the confinement of the liquid crystal. It goes without saying that this example is given purely for illustrative purposes only and that the digital information display device may be of the electrophoretic type or may also use an electronic ink. A flexible electrical connector 18 connects the electrodes of the liquid crystal display cell 12 to an electronic control circuit (not shown).

Conformément à l'invention, le substrat avant 14 de la cellule d'affichage à cristal liquide 12 est revêtu d'une couche adhésive 20 formée d'une colle optiquement transparente et par l'intermédiaire de laquelle la cellule d'affichage à cristal liquide 12 est appliquée contre la face inférieure 6 du cadran 2. Préférentiellement mais non limitativement, la cellule d'affichage à cristal liquide 12 est laminée mécaniquement contre la face inférieure 6 du cadran 2, puis l'ensemble formé par le cadran 2 et la cellule d'affichage à cristal liquide 12 est passé dans un autoclave afin de chasser l'air éventuellement piégé entre la couche adhésive 20 et le cadran 2. A titre d'exemple, la pression dans l'autoclave est de 6 bars, la température de traitement est de l'ordre de 50°C et le temps de traitement est d'environ 30 min.According to the invention, the front substrate 14 of the liquid crystal display cell 12 is coated with an adhesive layer 20 formed of an optically transparent adhesive and through which the liquid crystal display cell 12 is applied against the lower face 6 of the dial 2. Preferably, but not exclusively, the liquid crystal display cell 12 is mechanically laminated against the lower face 6 of the dial 2, then the assembly formed by the dial 2 and the cell liquid crystal display 12 is passed through an autoclave in order to expel the air possibly trapped between the adhesive layer 20 and the dial 2. For example, the pressure in the autoclave is 6 bar, the temperature of the treatment is of the order of 50 ° C and the treatment time is about 30 min.

Le montage est complété par une première cellule solaire 22. On comprendra que l'utilisation de cette cellule solaire 22 correspond au mode préféré de réalisation de l'invention mais que, dans la variante de base de l'invention, le module d'affichage 1 ne comprend que le cadran 2 et la cellule d'affichage à cristal liquide 12. Dans l'exemple illustré à la figure 1, la cellule solaire 22 présente une forme sensiblement en demi-cercle complémentaire de la forme de la cellule d'affichage à cristal liquide 12. La somme de la surface de la cellule d'affichage à cristal liquide 12 et de la cellule solaire 22 correspond sensiblement à celle du cadran 2.The assembly is completed by a first solar cell 22. It will be understood that the use of this solar cell 22 corresponds to the preferred embodiment of the invention but that, in the basic variant of the invention, the display module 1 includes only the dial 2 and the liquid crystal display cell 12. In the example shown in FIG. figure 1 , the solar cell 22 has a substantially semicircular shape complementary to the shape of the liquid crystal display cell 12. The sum of the area of the liquid crystal display cell 12 and the solar cell 22 substantially corresponds to that of the dial 2.

La cellule solaire 22 est disposée sous et à faible distance du cadran 2. A cet effet, elle est reçue dans une platine 24 qui est adaptée en forme et en dimensions à celles du cadran 2. Pour le maintien axial de la cellule solaire 22, la platine 24 comprend une surface d'appui 26 dont l'aire est sensiblement égale à celle de la cellule solaire 22. Pour son maintien radial, la cellule solaire 22 est munie le long de son périmètre extérieur d'au moins un et, préférentiellement, de deux ergots 28 qui sont engagés dans deux logements 30 correspondants prévus sur la périphérie de la platine 24. Comme on peut le voir au dessin, la surface d'appui 26 est percée de deux trous traversants 32 diamétralement opposés dans lesquels sont engagés des ressorts 34 qui permettent d'assurer le contact électrique entre les deux bornes de la cellule solaire 22 et le circuit électrique d'alimentation de la montre (non représenté).The solar cell 22 is arranged under and at a short distance from the dial 2. For this purpose, it is received in a plate 24 which is adapted in shape and dimensions to those of the dial 2. For the axial retention of the solar cell 22, the plate 24 comprises a bearing surface 26 whose area is substantially equal to that of the solar cell 22. For its radial maintenance, the solar cell 22 is provided along its outer perimeter of at least one and, preferably two pins 28 which are engaged in two corresponding housings 30 provided on the periphery of the plate 24. As can be seen in the drawing, the bearing surface 26 is pierced with two diametrically opposite through holes 32 in which are engaged springs 34 which ensure electrical contact between the two terminals of the solar cell 22 and the power supply circuit of the watch (not shown).

L'ensemble formé par le cadran 2 et la cellule d'affichage à cristal liquide 12 est disposé par-dessus la cellule solaire 22 et vient en appui sur un rebord périphérique 36 de la platine 24. On voit que la cellule d'affichage à cristal liquide 12 se trouve à l'aplomb d'une ouverture 38 ménagée dans la platine 24 et dont l'étendue correspond sensiblement à la surface de la cellule d'affichage à cristal liquide 12. Cette ouverture 38 permet à un dispositif de rétroéclairage 40 monté par le dessous de la platine 24 d'éclairer la cellule d'affichage à cristal liquide 12 par l'arrière.The assembly formed by the dial 2 and the liquid crystal display cell 12 is disposed above the solar cell 22 and bears on a peripheral rim 36 of the plate 24. It can be seen that the display cell liquid crystal 12 is located above an opening 38 formed in the plate 24 and whose extent substantially corresponds to the surface of the liquid crystal display cell 12. This opening 38 allows a backlight device 40 mounted from below the plate 24 to illuminate the liquid crystal display cell 12 from the rear.

Finalement, l'ensemble formé par le cadran 2, la cellule d'affichage à cristal liquide 12 et la cellule solaire 22 est immobilisé de manière démontable sur la platine 24 au moyen de crochets de verrouillage flexibles 42. On obtient ainsi un module d'affichage 1 complet qui peut être échangé pièce pour pièce en cas de dysfonctionnement. En cas de problème, il est même possible de déposer le module d'affichage 1 et de ne remplacer que le (ou les) composant(s) défectueux, ce qui est très avantageux d'un point de vue économique.Finally, the assembly formed by the dial 2, the liquid crystal display cell 12 and the solar cell 22 is detachably immobilized on the plate 24 by means of flexible locking hooks 42. A module of FIG. 1 complete display that can be exchanged piece for room in case of malfunction. In case of problems, it is even possible to remove the display module 1 and not replace only the defective component (s), which is very advantageous from an economic point of view.

La figure 2 est une vue en perspective et en éclaté d'un second exemple de réalisation d'un module d'affichage pour une pièce d'horlogerie selon l'invention. Dans tout ce qui suit, les éléments identiques ou analogues à ceux déjà décrits en liaison avec la figure 1 seront désignés par les mêmes références numériques.The figure 2 is a perspective and exploded view of a second exemplary embodiment of a display module for a timepiece according to the invention. In all that follows, elements identical or similar to those already described in connection with the figure 1 will be designated by the same numerical references.

On voit sur la figure 2 que le cadran 2 comprend un guichet 10 adapté en forme et en dimensions aux forme et dimensions du substrat avant 14 qui définit la surface supérieure d'affichage de la cellule d'affichage à cristal liquide 12. On voit également qu'une seconde cellule solaire 220 présente sensiblement les mêmes dimensions que le cadran 2 et est munie d'une ouverture 221 dans laquelle vient se loger la cellule d'affichage à cristal liquide 12 lorsque la cellule solaire 220 est disposée sous le cadran 2. On comprend que, lorsque l'on dispose sous le cadran 2 une cellule solaire de mêmes dimensions que le cadran 2, une partie de la surface de la cellule solaire va être masquée par la cellule d'affichage à cristal liquide 12. Or, on s'est rendu compte que le rendement de conversion photovoltaïque d'une cellule solaire de surface active donnée est moins bon lorsque la cellule solaire est partiellement obscurcie que lorsque la surface active de la cellule solaire est réduite en raison de la présence d'une ouverture de forme dans laquelle le dispositif numérique d'affichage d'informations vient se loger.We see on the figure 2 that the dial 2 comprises a window 10 adapted in shape and dimensions to the shape and dimensions of the front substrate 14 which defines the upper display surface of the liquid crystal display cell 12. It is also seen that a second solar cell 220 has substantially the same dimensions as the dial 2 and is provided with an opening 221 in which is housed the liquid crystal display cell 12 when the solar cell 220 is disposed under the dial 2. It is understood that when the Under the dial 2 there is a solar cell of the same dimensions as the dial 2, a portion of the surface of the solar cell will be masked by the liquid crystal display cell 12. It has been realized that the photovoltaic conversion efficiency of a given active surface solar cell is worse when the solar cell is partially obscured than when the active surface of the solar cell is reduced due to the resent of a shape opening in which the digital information display device is housed.

Pour le reste, le module d'affichage illustré à la figure 2 est identique à celui décrit ci-dessus en liaison avec la figure 1. La cellule d'affichage à cristal liquide 12 est fixée sur la face inférieure 6 du cadran 2 de préférence par laminage et la cellule solaire 220 est reçue dans la platine 24. Par la suite, l'ensemble formé par le cadran 2 et la cellule d'affichage à cristal liquide 12 est disposé par-dessus la cellule solaire 220, de façon que la cellule solaire 220 se trouve sous et à faible distance du cadran 2 et que la cellule d'affichage à cristal liquide 12 soit logée dans l'ouverture 221. Un dispositif de rétroéclairage 40 monté par le dessous de la platine 24 permet d'éclairer la cellule d'affichage à cristal liquide 12 par l'arrière à travers l'ouverture 38 ménagée dans la platine 24. L'ensemble formé par le cadran 2, la cellule d'affichage à cristal liquide 12 et la cellule solaire 220 est fixé de manière démontable sur la platine 24 au moyen d'une pluralité de crochets de verrouillage flexibles 42.For the rest, the display module illustrated in the figure 2 is identical to that described above in connection with the figure 1 . The liquid crystal display cell 12 is fixed on the lower face 6 of the dial 2 preferably by rolling and the solar cell 220 is received in the plate 24. Subsequently, the assembly formed by the dial 2 and the cell The liquid crystal display 12 is disposed above the solar cell 220, so that the solar cell 220 is under and at a short distance from the dial 2 and the liquid crystal display cell 12 is housed in the cell. opening 221. A Backlight device 40 mounted below the plate 24 makes it possible to illuminate the liquid crystal display cell 12 from the rear through the opening 38 formed in the plate 24. The assembly formed by the dial 2, the liquid crystal display cell 12 and the solar cell 220 are removably attached to the plate 24 by means of a plurality of flexible locking hooks 42.

Comme on peut le voir au dessin, la surface d'appui 26 est percée de deux trous traversants 32 disposés à proximité l'un de l'autre sur une portion de diamètre de la surface d'appui 26 dans lesquels sont engagés des ressorts 34 qui permettent d'assurer le contact électrique entre les deux bornes de la cellule solaire 220 et le circuit électrique d'alimentation de la montre (non représenté). On voit également que, pour son maintien radial, la cellule solaire 220 est pourvue sur sa périphérique d'au moins une et, préférentiellement, trois encoches 44 qui coopèrent avec trois tétons 46 correspondants de la platine 24.As can be seen in the drawing, the bearing surface 26 is pierced with two through-holes 32 placed close to one another on a diameter portion of the bearing surface 26 in which springs 34 are engaged. which make it possible to ensure the electrical contact between the two terminals of the solar cell 220 and the electric supply circuit of the watch (not shown). We also see that, for its radial maintenance, the solar cell 220 is provided on its device with at least one and, preferably, three notches 44 which cooperate with three corresponding pins 46 of the plate 24.

Dans le cas où la pièce d'horlogerie est du type montre solaire, le cadran 2 doit être au moins partiellement transparent afin de laisser passer une quantité suffisante de lumière pour permettre à la cellule solaire 22, 220 de recharger efficacement l'accumulateur de la montre tout en masquant la cellule solaire 22, 220 au regard du porteur.In the case where the timepiece is of the solar watch type, the dial 2 must be at least partially transparent in order to let a sufficient amount of light to allow the solar cell 22, 220 to effectively recharge the battery of the shows while masking the solar cell 22, 220 with regard to the wearer.

A titre d'exemple, le cadran 2 peut être réalisé en un matériau plastique transparent et être recouvert d'une couche de peinture dont l'opacité est ajustée en fonction de l'épaisseur de la couche de peinture et/ou de la concentration des pigments dans la peinture. La transmittance d'un cadran 2 en plastique transparent recouvert de peinture est de l'ordre de 45%. Autrement dit, 45% de la lumière incidente est transmise à la cellule solaire 22, 220 et le reste de la lumière est absorbé par le cadran 2, ce qui suffit à masquer la cellule solaire 22, 220 au regard de l'utilisateur. Selon un autre exemple, le cadran 2 en matière plastique peut être recouvert d'une couche de nacre dont l'épaisseur est typiquement de 150 µm ± 20 µm et dont la transmittance est ajustée à 35%. La couche de nacre est fixée sur la surface supérieure 4 du cadran 2 au moyen d'une couche de colle optiquement transparente.For example, the dial 2 can be made of a transparent plastic material and be covered with a layer of paint whose opacity is adjusted according to the thickness of the paint layer and / or the concentration of the pigments in the paint. The transmittance of a dial 2 of transparent plastic covered with paint is of the order of 45%. In other words, 45% of the incident light is transmitted to the solar cell 22, 220 and the rest of the light is absorbed by the dial 2, which is sufficient to mask the solar cell 22, 220 with respect to the user. In another example, the plastic dial 2 may be covered with a layer of mother-of-pearl whose thickness is typically 150 μm ± 20 μm and whose transmittance is adjusted to 35%. Layer mother-of-pearl is fixed on the upper surface 4 of the dial 2 by means of an optically transparent adhesive layer.

Selon encore un autre aspect de l'invention, on cherche à conférer au cadran 2 en plastique un aspect de matériau composite du type fibre de carbone. On sait qu'un tel matériau composite est obtenu au moyen de fibres de carbone entrelacées que l'on imprègne de résine, l'état de surface du matériau résultant présentant des zones légèrement en relief qui se répètent périodiquement.According to yet another aspect of the invention, it is sought to confer on the plastic dial 2 an appearance of composite material of the carbon fiber type. It is known that such a composite material is obtained by means of interleaved carbon fibers which are impregnated with resin, the surface state of the resulting material having slightly raised areas which are repeated periodically.

Pour imiter une telle texture, deux solutions sont envisagées. La première solution consiste à usiner dans la paroi intérieure du moule dans lequel est injectée la matière plastique des structurations qui formeront autant de zones en relief à la surface du cadran 2. La seconde solution utilise le principe d'une impression par tampographie classique (décalque avec cliché) ou d'une impression électronique qui est également envisageable d'un point de vue technique mais dont le rendu pour l'oeil est cependant un peu moins bon. Comme illustré sur les figures 3A et 3B annexées à la présente demande de brevet, l'effet carbone est obtenu par la répétition alternée et périodique de lignes horizontales 48 et de lignes verticales 50. Même si les lignes horizontales 48 semblent plus claires, ceci est uniquement dû à l'angle d'incidence de la lumière. Cet effet permet de rendre le cadran « vivant » en fonction de la lumière et c'est exactement la même chose avec du vrai carbone. Les lignes sont de couleur noire (lignes horizontales et lignes verticales). On aurait pu également utiliser un mélange de noir (lignes verticales) et de gris (lignes horizontales) pour obtenir l'effet carbone, mais dans ce cas celui-ci serait indépendant de la lumière et assez statique.To imitate such a texture, two solutions are envisaged. The first solution consists in machining in the inner wall of the mold into which the plastics material is injected structures which will form as many zones in relief on the surface of the dial 2. The second solution uses the principle of a conventional pad printing (decal with cliché) or an electronic printing that is also possible from a technical point of view but whose rendering for the eye is however a little less good. As illustrated on Figures 3A and 3B attached to this patent application, the carbon effect is obtained by the alternating and periodic repetition of horizontal lines 48 and vertical lines 50. Even if the horizontal lines 48 seem brighter, this is only due to the angle of incidence of light. This effect makes the dial "live" depending on the light and it's exactly the same with real carbon. The lines are black (horizontal lines and vertical lines). We could also use a mixture of black (vertical lines) and gray (horizontal lines) to obtain the carbon effect, but in this case it would be independent of light and quite static.

Il va de soi que la présente invention n'est pas limitée aux modes de réalisation qui viennent d'être décrits et que diverses modifications et variantes simples peuvent être envisagées par l'homme du métier sans sortir du cadre de l'invention tel que défini par les revendications annexées. On notera en particulier que dans le mode de réalisation illustré à la figure 1, la cellule d'affichage à cristal liquide 12 et la première cellule solaire 22 présentent chacune un dégagement, respectivement 52 et 54, pour le passage des axes d'aiguilles des heures et des minutes. De même, un trou traversant 56 est ménagé sur le chant de la surface d'appui 26 de la platine 24 et le dispositif de rétroéclairage 40 est percé d'un trou 58. De manière analogue, la seconde cellule solaire 220 est percée d'un trou 60 en son centre et la platine 24 est munie d'un trou 62 délimité par une collerette de guidage 64.It goes without saying that the present invention is not limited to the embodiments which have just been described and that various modifications and simple variants can be envisaged by those skilled in the art without departing from the scope of the invention as defined by the appended claims. It will be noted in particular that in the embodiment illustrated in FIG. figure 1 the liquid crystal display cell 12 and the first solar cell 22 each have a clearance, respectively 52 and 54, for the passage of the hour and minute pin axes. Similarly, a through hole 56 is formed on the edge of the bearing surface 26 of the plate 24 and the backlight device 40 is pierced with a hole 58. Similarly, the second solar cell 220 is pierced with a hole 60 at its center and the plate 24 is provided with a hole 62 defined by a guide flange 64.

Claims (6)

  1. Display module for a timepiece, said display module (1) including, on the one hand, a dial (2) on a lower face (6) of which is directly secured a digital information display device, and on the other hand, a solar cell (22; 220) and a plate (24), the solar cell (22; 220) being accommodated resting on the upper side of the plate (24) on a first bearing surface (26), and the assembly formed by the dial (2) and the digital information display device being accommodated resting on the upper side of the plate (24) on a second bearing surface (36) of the plate (24), said assembly covering the solar cell (22; 220).
  2. Display module according to claim 1, characterized in that the assembly formed by the dial (2) and the digital information display device on the one hand, and the solar cell (22; 220) on the other hand, are removably secured to an upper side of the plate (4).
  3. Display module according to claim 2, characterized in that the assembly formed by the dial (2) and the digital information display device on the one hand, and the solar cell (22) on the other hand, are removably locked on the plate (24) by means of flexible locking hooks (42).
  4. Display module according any of claims 1 to 3, characterized in that a backlight device (40) is disposed on a lower side of the plate (24) and is removably secured thereto.
  5. Display module according to claim 4, characterized in that, for axially maintaining the solar cell (22; 220), the plate(24) includes a bearing surface (26), the area of which is substantially equal to that of the solar cell (22; 220) and in that, for radially maintaining the solar cell (22, 220), the outer perimeter thereof is provided with at least one lug (28) or notch (44) that cooperates with a housing (30), respectively with a corresponding notch (44) provided on the periphery of the plate (24).
  6. Display module according to claim 5, characterized in that the assembly formed by the dial (2) and the digital information display device is disposed atop the solar cell (22) and rests on a peripheral rim (36) of the plate (24), the digital information display device being situated plumb with an opening (38) which is provided in the plate (24) and the area of which substantially corresponds to the area of the liquid crystal display cell (12), said opening (38) allowing the backlight device (40), mounted from underneath the plate (24), to backlight the digital information display device.
EP14702618.1A 2013-04-24 2014-02-05 Timepiece including a digital device for displaying information Active EP2989507B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15202670.4A EP3037900B1 (en) 2013-04-24 2014-02-05 Method for manufacturing a display module for a timepiece comprising a digital device for displaying information
EP14702618.1A EP2989507B1 (en) 2013-04-24 2014-02-05 Timepiece including a digital device for displaying information

Applications Claiming Priority (3)

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EP20130165115 EP2796946A1 (en) 2013-04-24 2013-04-24 Timepiece including a digital device for displaying information
PCT/EP2014/052192 WO2014173552A1 (en) 2013-04-24 2014-02-05 Display module for a timepiece comprising a solar cell
EP14702618.1A EP2989507B1 (en) 2013-04-24 2014-02-05 Timepiece including a digital device for displaying information

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EP15202670.4A Division EP3037900B1 (en) 2013-04-24 2014-02-05 Method for manufacturing a display module for a timepiece comprising a digital device for displaying information
EP15202670.4A Division-Into EP3037900B1 (en) 2013-04-24 2014-02-05 Method for manufacturing a display module for a timepiece comprising a digital device for displaying information

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EP2989507A1 EP2989507A1 (en) 2016-03-02
EP2989507B1 true EP2989507B1 (en) 2017-02-01

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EP14702618.1A Active EP2989507B1 (en) 2013-04-24 2014-02-05 Timepiece including a digital device for displaying information
EP15202670.4A Active EP3037900B1 (en) 2013-04-24 2014-02-05 Method for manufacturing a display module for a timepiece comprising a digital device for displaying information

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EP (3) EP2796946A1 (en)
JP (1) JP6216443B2 (en)
CN (1) CN105143998B (en)
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WO (1) WO2014173552A1 (en)

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EP3037900A1 (en) 2016-06-29
HK1218447A1 (en) 2017-02-17
CN105143998A (en) 2015-12-09
JP2016519302A (en) 2016-06-30
EP3037900B1 (en) 2016-10-12
US9354614B2 (en) 2016-05-31
WO2014173552A1 (en) 2014-10-30
JP6216443B2 (en) 2017-10-18
CN105143998B (en) 2017-12-12
EP2796946A1 (en) 2014-10-29
EP2989507A1 (en) 2016-03-02
US20160070238A1 (en) 2016-03-10

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