EP3679292B1 - Method for making a colour screen for a motor vehicle lighting and/or signalling device - Google Patents

Method for making a colour screen for a motor vehicle lighting and/or signalling device Download PDF

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Publication number
EP3679292B1
EP3679292B1 EP18783055.9A EP18783055A EP3679292B1 EP 3679292 B1 EP3679292 B1 EP 3679292B1 EP 18783055 A EP18783055 A EP 18783055A EP 3679292 B1 EP3679292 B1 EP 3679292B1
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EP
European Patent Office
Prior art keywords
film
punch
way
passage
auxiliary
Prior art date
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Active
Application number
EP18783055.9A
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German (de)
French (fr)
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EP3679292A1 (en
Inventor
Alain Buisson
Christophe LAFFETA
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.)
Marelli Automotive Lighting France SAS
Original Assignee
Marelli Automotive Lighting France SAS
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Priority to PL18783055T priority Critical patent/PL3679292T3/en
Publication of EP3679292A1 publication Critical patent/EP3679292A1/en
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Publication of EP3679292B1 publication Critical patent/EP3679292B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/4481—Cutters therefor; Dies therefor having special lateral or edge outlines or special surface shapes, e.g. apertures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass

Definitions

  • the present invention relates to a method for producing a color screen in plastic material comprising at least one film inserted into another film of a different color. It relates more particularly to the manufacture of a color screen for a lighting and / or signaling device for a motor vehicle, of the lantern or projector type.
  • the regulations in force require the use of lighting and signaling lights on motor vehicles: direction indicators or flashing lights, fog lights, position lights, parking lights, reversing lights, hazard lights, daytime running lights. ..
  • the tendency is to group these lights as much as possible in the same lighting device in order to reduce their bulk.
  • the most frequent solution consists in placing at the front of the lighting device a single screen comprising areas of different colors that are more or less transparent. Each color is associated with a lighting or signaling function mentioned above.
  • the lighting device then comprises a separate light source to illuminate each color zone, which makes it possible to use a single screen integrating all the functions imposed by the regulations.
  • the use of a single color screen makes it possible to significantly reduce the size of the lighting device compared with devices using several screens of different colors.
  • the color screen is produced from a transparent support on which films of different colors are superimposed.
  • the transparent support and / or the superposition of the colored films alters the optical properties of each film, in particular their color and their light transmission properties.
  • the overlay of films color on the transparent support increases the thickness of the screen, which can prove to be problematic when it is desired to limit the size of the lighting device.
  • the colored films are maintained on the transparent support by means of adhesives which alter the optical properties of the colored films over time.
  • the invention aims to provide an alternative to the production of a color screen for a lighting and / or signaling device for a motor vehicle. More precisely, the invention wishes to propose a method for producing a screen comprising zones of different colors, the light transmission properties of which are preserved during manufacture of the screen and over time.
  • the first film is compressed against the second film in order to detach a part of the second film and replace that part.
  • the first film thus plays the role of a punch to perforate the second film, but unlike a conventional punching process, the punch played by the first film is left in the second film.
  • the invention thus makes it possible to produce a color screen comprising two zones of different colors without using a support. transparent as mentioned above. Therefore, the optical properties of each film are preserved during the manufacture of the color screen and its thickness is limited to that of the thickest film.
  • the first film is forcibly inserted into the second film so as to be held by the latter.
  • No glue or chemical agent is therefore used to maintain the films, which makes it possible to preserve their light transmission properties over time.
  • the first and the second film do not overlap.
  • the insertion of the first film in the second film can thus be carried out independently of their optical properties, offering a greater variety of use of colored films.
  • the first film and / or the second film is transparent or translucent. At least one film has a color associated with a lighting or signaling function mentioned above.
  • the first film has a thickness of between 0.375 mm and 0.8 mm, preferably of the order of 0.5 mm.
  • thickness is meant here the distance separating the largest opposite faces of a film.
  • the first film is thinner than the second film.
  • the thickness of the first film is limited to the thickness of the second film.
  • the thickness of the second film is greater than 0.4 mm, preferably equal to or greater than 0.5 mm.
  • the thickness of the second film is chosen so that the second film has sufficient rigidity to retain its shape.
  • the first and / or the second film can be manufactured beforehand by a thermoforming technique.
  • the first film is positioned in the second film so as to be flush with and / or set back from a large face from the second film.
  • the first film is arranged so as to be flush with a larger face of the second film, so that at said face, the color screen is smooth or substantially smooth.
  • the first film deforms less easily than the second film, under the same mechanical stress normally applied to their larger faces.
  • the plasticity and / or elasticity of the first film is lower than that of the second film, in order to facilitate the insertion of the first film into the second film, while preserving the shape of the first film.
  • this embodiment allows better mechanical retention of the first film in the second film.
  • the first film has an area of between 1 mm 2 and 20 mm 2 , preferably of the order of 10 mm 2 .
  • the surface of the first film has an aspect ratio of between 1: 1 and 1:20.
  • the outline of the first film can thus define an oval, circular, rectangular, square, triangular or other shape.
  • the first film can be of various and various forms.
  • the first film and / or the second film is at least partially curved.
  • the first and / or the second film are not planar and can include one or more points of inflection at the level of one of their large faces.
  • the first film and the second film have the same shape, or substantially the same radii of curvature.
  • the first film and / or the second film is composed of a stack of layers.
  • the first and / or the second film can comprise at least one metallized layer.
  • the metallized layer has a chrome appearance, and / or blue in color.
  • the metallized layer is interposed between two plastic layers based on polymers, polymethyl methacrylate (PMMA) or polycarbonate (PC).
  • the method described above is reproduced so as to produce a color film comprising several first films.
  • the method according to the invention can be implemented several times so that the first film forms, in the second film, geometric patterns of color and of different or identical shapes.
  • the second film prior to or before the compression step described above, is positioned against an upper face of a die, the upper face comprising at least one opening of a shape complementary to the contours of the first. film so as to receive the part of the second film which is detached by the first film during the compression step.
  • the part of the second film detached by the first film commonly called the opening, is thus expelled into the opening present at the level of the upper face of the die during the compression step.
  • the term “upper” is used here arbitrarily, so that it is not intended to limit a particular arrangement of the matrix with respect to the color screen.
  • the outline of the first film is cut so as to have a shape complementary to the opening of the matrix.
  • the value of the cutting clearance between the first film and the opening of the die is between 0.01 and 0.1 mm, preferably of zero value.
  • the first film is shaped before the compression step so that the outline of the first film and the outline of the opening of the die are substantially the same, preferably identical.
  • the larger opposite faces of the first film are connected by at least one passage.
  • the passage or passages extend in a direction normal to the largest faces.
  • at least one passage is made using an auxiliary punch, the auxiliary punch is inserted into the first film prior to the step of compressing the first film against the second film, and the punch auxiliary is removed from the first film after the step of positioning the first film in the second film.
  • the auxiliary punch can be used to move the first film during the process for producing the color screen according to the invention.
  • the auxiliary punch makes it possible to provide a passage in the first film which can be filled with a third film according to a process described above.
  • the auxiliary punch is mounted on a punch so that the auxiliary punch protrudes from a bearing face of the punch, and said bearing face is superimposed substantially or preferably perfectly on the first film. during its punching by the auxiliary punch.
  • the bearing face is of identical shape to the first film so that the first film is in contact with the entire bearing face when it is punched by the auxiliary punch.
  • the present invention also relates to a lighting and / or signaling device for a motor vehicle comprising a color screen produced according to one of the methods described above.
  • the invention proposes a method for producing a color screen for a lighting and / or signaling device for a motor vehicle, comprising areas of different colors, the light transmission properties of which are preserved. during manufacture of the screen and over time.
  • a first step of the method consists in maintaining a first film 2 against a punch 4. More precisely, the first film 2 is held against a bearing face 6 of the punch by reversible holding means.
  • the holding means may designate a double-sided adhesive interposed between the punch 4 and the first film 2, or else suction means opening onto the bearing face 6, of the suction cup type.
  • the first film 2 is configured to cover the entire bearing face 6 without protruding therefrom.
  • the first film 2 is made of plastic, in particular polymethyl methacrylate (PMMA) or polycarbonate (PC). It can be colorless or colored, transparent or translucent.
  • the first film 2 can also include inclusions or irregularities intentionally present inside and / or on the outside of the film, in order to modify the incidence of a light beam passing through it.
  • the first film 2 can comprise prisms of predefined structure and angle, to meet the requirements of the regulations in this area, known to those skilled in the art.
  • the first film 2 can be composed of a stack of layers.
  • the stack of layers can include a metallized layer.
  • the metallized layer can be covered on each side by an adhesive layer, itself covered on one side by a layer of ABS and, on the other hand by a layer of PMMA and then a protective layer.
  • the thickness of the first film is between 0.375 mm and 0.5 mm. According to the present example, its thickness is 0.5 mm.
  • a second film 10 is placed on a die 12 so as to completely cover a cavity 14 opening onto an upper face 16 of the die 12.
  • the cavity 14 defines an opening 18 at the level of the upper face 16 , the contour of which is of complementary shape to the contour of the bearing face 6. More precisely, the outline of the opening 18 is slightly greater than the outline of the bearing face in order to allow the insertion of a part of the punch 4 in cavity 14. In other words, the value of the cutting clearance between punch 4 and die 12 is less than 0.5 mm, preferably this value tends towards zero.
  • the second film 10 is also made of plastic, in particular polymethyl methacrylate (PMMA) or polycarbonate (PC). It can be colorless or colored, transparent or translucent. The second film 10 can also include inclusions or irregularities intentionally present inside and / or on the outside of the film, in order to modify the incidence of a light beam passing through it.
  • the thickness of the second film defined as the distance separating its largest faces 9, may be equal to the first film 2. As illustrated in figure 1 , the thickness of the second film is preferably greater than the thickness of the first film 2 for the reasons indicated below. According to the present example, the thickness of the second film 10 is 1 mm. It should be noted that the first film 2 and the second film 10 have a visual appearance and / or different colors in order to delimit visually distinctive areas.
  • the second film 10 differs from the first film 2 in that it deforms more easily than the first film in order to allow easier insertion and better maintenance of the first film by the second film.
  • the punch 4 and the die 12 are aligned and brought together so that the first film 2 compresses the second film 10 until it detaches and drops part 11 of the second film into the bottom 20 of the cavity 14.
  • the cavity 14 is deep enough to accommodate the part 11 or the opening of the second film.
  • the first film 2 punches the second film 10 so as to form a passage 22 through the second film.
  • the passage 22 extends normally to the larger faces 9 of the second layer 10.
  • the punch 4 and the die 12 are then moved apart so as to position the first film 2 in the passage 22.
  • the first film 2 is positioned so as to be flush with a large face 9 of the second film 10.
  • the first film 2 is positioned so as to be set back from the large faces 9 of the second film 10.
  • the method described here thus makes it possible to obtain a color screen 24A as illustrated in figure 4 , comprising a first film 2 inserted into a second film 10 in order to delimit visually distinct zones at the level of the same surface.
  • the first film and the second film may respectively be chrome in appearance and red in color or vice versa.
  • the first film 2 does not protrude from the second film 10 which makes it possible, on the one hand, to form a color screen 24A whose thickness is limited to the thickest film, in this case the second film 10, and on the other hand to allow a more homogeneous covering of the color screen 24A by another layer if necessary, for example a protective layer.
  • the first film 2 can be positioned so as to be flush with a large face 9 of the second film in order to form a smooth surface, favorable to the deposition of a regular layer.
  • the first and the second film do not overlap this which preserves the light transmission properties of each film.
  • the first film 2 is of suitable shape and dimensions in order to be perfectly superimposed on the bearing face 6 of the punch 4 (see figure 1 ). However, it may turn out that this is not the case and that it is necessary to format the first film beforehand.
  • the figures 5 and 6 illustrate a method of shaping the first film 2 consisting in punching the first film against the die 12 so as to remove the parts 26 of the first film 2 projecting from the bearing face 6. Of course, the steps illustrated by the figures 5 and 6 are carried out prior to the steps illustrated in figures 1 to 3 .
  • the figures 7 to 12 now illustrate a second exemplary embodiment of a method of a color screen 24B according to the invention.
  • This example differs from the first example in that the first film 2 is now held at the punch 4 by means of auxiliary punches 28.
  • the first film is placed on an auxiliary die 30 so as to completely cover two cavities. 32 distinct and opening onto an upper face 34 of the auxiliary die 30.
  • Each cavity 32 thus defines an opening 36 at the level of the upper face 34.
  • Each auxiliary punch 28 has a shape complementary to the openings 34 of the auxiliary die 30, so that the value of the cutting clearance between the auxiliary punches 28 and the auxiliary die 30 is less than 0.5 mm, preferably this value tends towards zero.
  • the punch 4 is positioned above the first film 2 so that each auxiliary punch 28 faces a cavity 32.
  • the punch 4 and the auxiliary die 30 are then brought together so that each auxiliary punch 28 completely passes through the first film 2 as illustrated by figure 8 .
  • the auxiliary punches 28 hold the first film 2 against the bearing surface 6 of the punch, thus playing the role of the holding means described above.
  • the auxiliary punches 28 are configured to hold the first film 2 to the punch 4 during the process of making a color screen described above.
  • the side walls 38 of the auxiliary punches 28 are configured to hold the first film 2 by a phenomenon of mechanical friction.
  • the side walls 38 may include a graining or grooves (not shown in the figures) in order to promote this phenomenon.
  • the figures 9 and 11 represent steps similar to those shown in figures 1 to 3 .
  • This second exemplary embodiment makes it possible to obtain a color screen 24B as illustrated on figure 12 , comprising a first film 2 inserted into a second film 10 in order to visually delimit distinct zones at the same surface.
  • the first film 2 now comprises two passages 40 formed by the auxiliary punches 28.
  • This embodiment is particularly advantageous for providing openings in the first film which may optionally be closed by a third film not shown, according to one of the methods described above.
  • this second exemplary embodiment of the invention can make it possible to form films comprising a first film inserted into a second film and a third film inserted into the first film.
  • the three films can be the same or different to form a complex nested pattern.
  • the first film 2 is of suitable shape and dimensions so as to be perfectly superimposed on the bearing face of the punch 4 (see figure 8 ). However, it may turn out that this is not the case and that it is necessary to format the first film beforehand.
  • the figures 13 to 16 illustrate a method of shaping the first film 2 consisting in punching the first film against the auxiliary die 30 so as to remove the parts 40 of the first film 2 projecting from the bearing face 6. Naturally, the steps illustrated by the figures 13 to 16 are carried out prior to the steps illustrated in figures 7 to 11 .
  • the films are flat.
  • the invention is not limited to the use of flat films. Those skilled in the art can therefore easily adapt the above examples to make curved screens from first (s) and second (s) curved films.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

Domaine technique de l'inventionTechnical field of the invention

La présente invention concerne un procédé de réalisation d'un écran de couleurs en matière plastique comprenant au moins un film inséré dans un autre film de couleur différente. Elle concerne plus particulièrement la fabrication d'un écran de couleurs pour un dispositif d'éclairage et/ou de signalisation pour un véhicule automobile, de type lanterne ou projecteur.The present invention relates to a method for producing a color screen in plastic material comprising at least one film inserted into another film of a different color. It relates more particularly to the manufacture of a color screen for a lighting and / or signaling device for a motor vehicle, of the lantern or projector type.

État de la techniqueState of the art

La réglementation en vigueur impose l'utilisation de feux d'éclairage et de signalisation sur les véhicules automobiles : indicateurs de direction ou feux clignotants, feux antibrouillards, feux de position, feux de stationnement, feux de recul, feux de détresse, feux diurnes... La tendance est de regrouper ces feux autant que possible dans un même dispositif d'éclairage afin de réduire leur encombrement.The regulations in force require the use of lighting and signaling lights on motor vehicles: direction indicators or flashing lights, fog lights, position lights, parking lights, reversing lights, hazard lights, daytime running lights. .. The tendency is to group these lights as much as possible in the same lighting device in order to reduce their bulk.

La solution la plus fréquente consiste à placer à l'avant du dispositif d'éclairage un seul écran comprenant des zones de différentes couleurs plus ou moins transparentes. À chaque couleur est associée une fonction d'éclairage ou de signalisation mentionnées ci-dessus. Le dispositif d'éclairage comporte alors une source de lumière distincte pour éclairer chaque zone de couleur, ce qui permet d'utiliser un seul écran intégrant toutes les fonctions imposées par la réglementation. L'utilisation d'un seul écran de couleurs permet de diminuer de façon significative l'encombrement du dispositif d'éclairage par rapport aux dispositifs utilisant plusieurs écrans de différentes couleurs.The most frequent solution consists in placing at the front of the lighting device a single screen comprising areas of different colors that are more or less transparent. Each color is associated with a lighting or signaling function mentioned above. The lighting device then comprises a separate light source to illuminate each color zone, which makes it possible to use a single screen integrating all the functions imposed by the regulations. The use of a single color screen makes it possible to significantly reduce the size of the lighting device compared with devices using several screens of different colors.

Généralement, par exemple dans le document US 9 500 333 B1 , l'écran de couleurs est réalisé à partir d'un support transparent sur lequel sont superposés des films de différentes couleurs. Or, le support transparent et/ou la superposition des films de couleur altère les propriétés optiques de chaque film, notamment leur couleur et leurs propriétés de transmission de la lumière. De plus, la superposition des films de couleur sur le support transparent augmente l'épaisseur de l'écran, ce qui peut s'avérer problématique lorsqu'on souhaite limiter l'encombrement du dispositif d'éclairage.Usually, for example in the document US 9,500 333 B1 , the color screen is produced from a transparent support on which films of different colors are superimposed. However, the transparent support and / or the superposition of the colored films alters the optical properties of each film, in particular their color and their light transmission properties. In addition, the overlay of films color on the transparent support increases the thickness of the screen, which can prove to be problematic when it is desired to limit the size of the lighting device.

Selon un autre inconvénient, les films de couleur sont maintenus sur le support transparent par l'intermédiaire de colles qui altèrent les propriétés optiques des films de couleur au cours du temps.According to another drawback, the colored films are maintained on the transparent support by means of adhesives which alter the optical properties of the colored films over time.

L'invention vise à proposer une alternative à la réalisation d'un écran de couleurs pour un dispositif d'éclairage et/ou de signalisation pour véhicule automobile. Plus précisément, l'invention souhaite proposer un procédé de réalisation d'un écran comprenant des zones de différentes couleurs, dont les propriétés de transmission de la lumière sont préservées lors de fabrication de l'écran et au cours du temps.The invention aims to provide an alternative to the production of a color screen for a lighting and / or signaling device for a motor vehicle. More precisely, the invention wishes to propose a method for producing a screen comprising zones of different colors, the light transmission properties of which are preserved during manufacture of the screen and over time.

Description de l'inventionDescription of the invention

Pour cela, la présente demande propose un procédé de réalisation d'un écran de couleurs pour un dispositif d'éclairage et/ou de signalisation pour un véhicule automobile, mettant en œuvre les étapes suivantes :

  • une étape de compression d'un premier film contre un deuxième film de plus grande surface, de manière à ce que le premier film perfore le deuxième film et réalise ainsi un passage aux dimensions du premier film, le premier et le deuxième film étant en matière plastique et de couleurs différentes ; puis
  • une étape de positionnement du premier film dans le passage de manière à obturer ledit passage.
For this, the present application proposes a method for producing a color screen for a lighting and / or signaling device for a motor vehicle, implementing the following steps:
  • a step of compressing a first film against a second film with a larger surface area, so that the first film perforates the second film and thus makes a passage to the dimensions of the first film, the first and the second film being made of material plastic and different colors; then
  • a step of positioning the first film in the passage so as to close said passage.

En d'autres termes, le premier film est compressé contre le deuxième film afin de détacher une partie du deuxième film et se substituer à cette partie. Le premier film joue ainsi le rôle d'un poinçon pour perforer le deuxième film, mais à la différence d'un procédé de poinçonnage classique, le poinçon joué par le premier film est laissé dans le deuxième film.In other words, the first film is compressed against the second film in order to detach a part of the second film and replace that part. The first film thus plays the role of a punch to perforate the second film, but unlike a conventional punching process, the punch played by the first film is left in the second film.

L'invention permet ainsi la réalisation d'un écran de couleurs comprenant deux zones de couleurs différentes sans utiliser un support transparent comme mentionné ci-dessus. De ce fait, les propriétés optiques de chaque film sont préservées lors de la fabrication de l'écran de couleurs et son épaisseur est limitée à celle du film le plus épais.The invention thus makes it possible to produce a color screen comprising two zones of different colors without using a support. transparent as mentioned above. Therefore, the optical properties of each film are preserved during the manufacture of the color screen and its thickness is limited to that of the thickest film.

Selon un autre avantage, le premier film est inséré de force dans le deuxième film de manière à être maintenu par ce dernier. Aucune colle ou agent chimique n'est donc utilisé pour assurer le maintien des films, ce qui permet de préserver leurs propriétés de transmission de la lumière au cours du temps.According to another advantage, the first film is forcibly inserted into the second film so as to be held by the latter. No glue or chemical agent is therefore used to maintain the films, which makes it possible to preserve their light transmission properties over time.

Selon un autre avantage, le premier et le deuxième film ne se superposent pas. L'insertion du premier film dans le deuxième film peut ainsi être réalisée indépendamment de leurs propriétés optiques, offrant une plus grande variété d'utilisation de films de couleur.According to another advantage, the first and the second film do not overlap. The insertion of the first film in the second film can thus be carried out independently of their optical properties, offering a greater variety of use of colored films.

Selon un autre mode de réalisation , le premier film et/ou le deuxième film est transparent ou translucide. Au moins un film a une couleur associée à une fonction d'éclairage ou de signalisation mentionnée ci-dessus.According to another embodiment, the first film and / or the second film is transparent or translucent. At least one film has a color associated with a lighting or signaling function mentioned above.

Selon un autre mode de réalisation, le premier film a une épaisseur comprise entre 0,375 mm et 0,8 mm, de préférence de l'ordre de 0,5 mm. Par le terme « épaisseur », on entend ici la distance séparant les plus grandes faces opposées d'un film.According to another embodiment, the first film has a thickness of between 0.375 mm and 0.8 mm, preferably of the order of 0.5 mm. By the term “thickness” is meant here the distance separating the largest opposite faces of a film.

Selon un autre mode de réalisation, le premier film est moins épais que le deuxième film. En d'autres termes, on limite l'épaisseur du premier film à l'épaisseur du deuxième film. L'épaisseur du deuxième film est supérieure à 0,4 mm, de préférence égale ou supérieure à 0,5 mm. Selon une variante de réalisation préférée, l'épaisseur du deuxième film est choisie de manière à ce que le deuxième film ait une rigidité suffisante pour conserver sa forme. À ce titre, le premier et/ou le deuxième film peut être préalablement fabriqué par une technique de thermoformage.According to another embodiment, the first film is thinner than the second film. In other words, the thickness of the first film is limited to the thickness of the second film. The thickness of the second film is greater than 0.4 mm, preferably equal to or greater than 0.5 mm. According to a preferred embodiment variant, the thickness of the second film is chosen so that the second film has sufficient rigidity to retain its shape. As such, the first and / or the second film can be manufactured beforehand by a thermoforming technique.

Selon une variante de réalisation, le premier film est positionné dans le deuxième film de sorte à affleurer et/ou être en retrait d'une grande face du deuxième film. De préférence, le premier film est agencé de sorte à affleurer une plus grande face du deuxième film, afin qu'au niveau de ladite face, l'écran de couleur soit lisse ou sensiblement lisse. Ce mode de réalisation permet avantageusement de recouvrir ultérieurement ladite face par un dépôt de matière plus homogène.According to an alternative embodiment, the first film is positioned in the second film so as to be flush with and / or set back from a large face from the second film. Preferably, the first film is arranged so as to be flush with a larger face of the second film, so that at said face, the color screen is smooth or substantially smooth. This embodiment advantageously makes it possible to subsequently cover said face with a deposit of more homogeneous material.

Selon un autre mode de réalisation, le premier film se déforme moins aisément que le deuxième film, sous une même contrainte mécanique appliquée normalement à leurs plus grandes faces. Autrement dit, la plasticité et/ou l'élasticité du premier film est inférieure à celle du deuxième film, afin de faciliter l'insertion du premier film dans le deuxième film, tout en préservant la forme du premier film. Selon un autre avantage, ce mode de réalisation permet un meilleur maintien mécanique du premier film dans le deuxième film.According to another embodiment, the first film deforms less easily than the second film, under the same mechanical stress normally applied to their larger faces. In other words, the plasticity and / or elasticity of the first film is lower than that of the second film, in order to facilitate the insertion of the first film into the second film, while preserving the shape of the first film. According to another advantage, this embodiment allows better mechanical retention of the first film in the second film.

Selon un autre mode de réalisation, le premier film a une surface comprise entre 1 mm2 et 20 mm2, de préférence de l'ordre de 10 mm2.According to another embodiment, the first film has an area of between 1 mm 2 and 20 mm 2 , preferably of the order of 10 mm 2 .

Selon un autre mode de réalisation, la surface du premier film à un rapport de forme compris entre 1:1 et 1:20. Le contour du premier film peut ainsi délimiter une forme ovale, circulaire, rectangulaire, carrée, triangulaire ou autres. Autrement dit, le premier film peut être de formes variées et diverses.According to another embodiment, the surface of the first film has an aspect ratio of between 1: 1 and 1:20. The outline of the first film can thus define an oval, circular, rectangular, square, triangular or other shape. In other words, the first film can be of various and various forms.

Selon un autre mode de réalisation, le premier film et/ou le deuxième film est au moins partiellement courbé. En d'autres termes, le premier et/ou le deuxième film ne sont pas plans et peuvent comprendre un ou plusieurs points d'inflexion au niveau d'une de leurs grandes faces. De préférence, le premier film et le deuxième film ont la même forme, ou sensiblement le ou les mêmes rayons de courbure.According to another embodiment, the first film and / or the second film is at least partially curved. In other words, the first and / or the second film are not planar and can include one or more points of inflection at the level of one of their large faces. Preferably, the first film and the second film have the same shape, or substantially the same radii of curvature.

Selon un autre mode de réalisation, le premier film et/ou le deuxième film est composé d'un empilement de couches. Le premier et/ou le deuxième film peut comprendre au moins une couche métallisée. De préférence , la couche métallisée est d'aspect chromé, et/ou de couleur bleue. Selon une variante de réalisation , la couche métallisée est intercalée entre deux couches en matière plastique à base de polymères, en polyméthacrylate de méthyle (PMMA) ou en polycarbonate (PC).According to another embodiment, the first film and / or the second film is composed of a stack of layers. The first and / or the second film can comprise at least one metallized layer. Preferably, the metallized layer has a chrome appearance, and / or blue in color. According to an alternative embodiment, the metallized layer is interposed between two plastic layers based on polymers, polymethyl methacrylate (PMMA) or polycarbonate (PC).

Selon un autre mode de réalisation, le procédé décrit ci-dessus est reproduit de manière à réaliser un film de couleurs comprenant plusieurs premiers films. En d'autres termes, le procédé selon l'invention peut être mis en œuvre plusieurs fois afin que le premier film forme dans le deuxième film des motifs géométriques de couleur et de formes différentes ou identiques.According to another embodiment, the method described above is reproduced so as to produce a color film comprising several first films. In other words, the method according to the invention can be implemented several times so that the first film forms, in the second film, geometric patterns of color and of different or identical shapes.

Selon un autre mode de réalisation, préalablement ou avant à l'étape de compression décrite ci-dessus, le deuxième film est positionné contre une face supérieure d'une matrice, la face supérieure comprenant au moins une ouverture de forme complémentaire aux contours du premier film de manière à recevoir la partie du deuxième film qui est détachée par le premier film lors de l'étape de compression. De façon avantageuse, la partie du deuxième film détachée par le premier film, communément appelée débouchure, est ainsi expulsée dans l'ouverture présente au niveau de la face supérieure de la matrice lors de l'étape de compression. Il est à noter que le terme « supérieur » est ici employé de façon arbitraire, de sorte qu'il ne vise pas à limiter un agencement particulier de la matrice par rapport à l'écran de couleurs.According to another embodiment, prior to or before the compression step described above, the second film is positioned against an upper face of a die, the upper face comprising at least one opening of a shape complementary to the contours of the first. film so as to receive the part of the second film which is detached by the first film during the compression step. Advantageously, the part of the second film detached by the first film, commonly called the opening, is thus expelled into the opening present at the level of the upper face of the die during the compression step. It should be noted that the term “upper” is used here arbitrarily, so that it is not intended to limit a particular arrangement of the matrix with respect to the color screen.

Selon un autre mode de réalisation, préalablement à l'étape de compression, le contour du premier film est découpé de sorte à avoir une forme complémentaire de l'ouverture de la matrice. Selon un mode de réalisation préféré, la valeur du jeu de coupe entre le premier film et l'ouverture de la matrice est comprise entre 0,01 et 0,1 mm, de préférence de valeur nulle. Autrement dit, le premier film est mis en forme avant l'étape de compression de sorte que le contour du premier film et le contour de l'ouverture de la matrice sont sensiblement les mêmes, de préférence identiques.According to another embodiment, prior to the compression step, the outline of the first film is cut so as to have a shape complementary to the opening of the matrix. According to a preferred embodiment, the value of the cutting clearance between the first film and the opening of the die is between 0.01 and 0.1 mm, preferably of zero value. In other words, the first film is shaped before the compression step so that the outline of the first film and the outline of the opening of the die are substantially the same, preferably identical.

Selon un autre mode de réalisation, les plus grandes faces opposées du premier film sont reliées par au moins un passage. De préférence , le ou les passages s'étendent selon une direction normale aux plus grandes faces. Selon un mode de réalisation préféré, au moins un passage est réalisé à l'aide d'un poinçon auxiliaire, le poinçon auxiliaire est inséré dans le premier film préalablement à l'étape de compression du premier film contre le deuxième film, et le poinçon auxiliaire est retiré du premier film après l'étape de positionnement du premier film dans le deuxième film. Ainsi, de façon avantageuse, le poinçon auxiliaire peut être utilisé pour déplacer le premier film lors du procédé de réalisation de l'écran de couleurs selon l'invention. Selon un autre avantage, le poinçon auxiliaire permet de ménager un passage dans le premier film qui peut être comblé par un troisième film selon un procédé décrit ci-dessus.According to another embodiment, the larger opposite faces of the first film are connected by at least one passage. Preferably, the passage or passages extend in a direction normal to the largest faces. According to a preferred embodiment, at least one passage is made using an auxiliary punch, the auxiliary punch is inserted into the first film prior to the step of compressing the first film against the second film, and the punch auxiliary is removed from the first film after the step of positioning the first film in the second film. Thus, advantageously, the auxiliary punch can be used to move the first film during the process for producing the color screen according to the invention. According to another advantage, the auxiliary punch makes it possible to provide a passage in the first film which can be filled with a third film according to a process described above.

Selon un autre mode de réalisation, le poinçon auxiliaire est monté sur un poinçon de sorte que le poinçon auxiliaire est en saillie d'une face d'appui du poinçon, et ladite face d'appui se superpose sensiblement ou de préférence parfaitement au premier film lors de son poinçonnage par le poinçon auxiliaire. Selon un mode de réalisation préféré, la face d'appui est de forme identique au premier film de sorte que le premier film est en contact avec toute la face d'appui lors de son poinçonnage par le poinçon auxiliaire.According to another embodiment, the auxiliary punch is mounted on a punch so that the auxiliary punch protrudes from a bearing face of the punch, and said bearing face is superimposed substantially or preferably perfectly on the first film. during its punching by the auxiliary punch. According to a preferred embodiment, the bearing face is of identical shape to the first film so that the first film is in contact with the entire bearing face when it is punched by the auxiliary punch.

La présente invention concerne également un dispositif d'éclairage et/ou de signalisation pour un véhicule automobile comprenant un écran de couleurs réalisé selon l'un des procédés décrits ci-dessus.The present invention also relates to a lighting and / or signaling device for a motor vehicle comprising a color screen produced according to one of the methods described above.

Description des figuresDescription of figures

Les caractéristiques de l'invention mentionnées ci-dessus, ainsi que d'autres, apparaîtront plus clairement à la lecture de la description suivantes des exemples de réalisation ci-dessous, en se référant aux dessins annexés sur lesquels :

  • les figures 1 à 3 illustrent les étapes d'un premier exemple d'un procédé de réalisation d'un écran de couleurs selon l'invention ;
  • la figure 4 illustre une vue de face d'un écran de couleurs obtenu selon le procédé illustré par les figures 1 à 3 ;
  • les figures 5 et 6 illustrent une étape de mise en forme d'un premier film préalablement au procédé illustré par les figures 1 à 3.
  • les figures 7 à 11 illustrent les étapes d'un deuxième exemple d'un procédé de réalisation d'un écran de couleurs selon l'invention ;
  • la figure 12 illustre une vue de face d'un écran de couleurs obtenu selon le procédé illustré par les figures 7 à 11 ;
  • les figures 13 et 16 illustrent une étape de mise en forme d'un premier film préalablement au procédé illustré par les figures 7 à 11.
The characteristics of the invention mentioned above, as well as others, will emerge more clearly on reading the following description of the exemplary embodiments below, with reference to the appended drawings in which:
  • the figures 1 to 3 illustrate the steps of a first example of a method for producing a color screen according to the invention;
  • the figure 4 illustrates a front view of a color screen obtained according to the method illustrated by the figures 1 to 3 ;
  • the figures 5 and 6 illustrate a step of shaping a first film prior to the process illustrated by the figures 1 to 3 .
  • the figures 7 to 11 illustrate the steps of a second example of a method for producing a color screen according to the invention;
  • the figure 12 illustrates a front view of a color screen obtained according to the method illustrated by the figures 7 to 11 ;
  • the figures 13 and 16 illustrate a step of shaping a first film prior to the process illustrated by the figures 7 to 11 .

Description détaillée de l'inventionDetailed description of the invention

Pour rappel, l'invention propose un procédé de réalisation d'un écran de couleurs pour un dispositif d'éclairage et/ou de signalisation pour un véhicule automobile, comprenant des zones de différentes couleurs, dont les propriétés de transmission de la lumière sont préservées lors de fabrication de l'écran et au cours du temps.As a reminder, the invention proposes a method for producing a color screen for a lighting and / or signaling device for a motor vehicle, comprising areas of different colors, the light transmission properties of which are preserved. during manufacture of the screen and over time.

Les figures 1 à 4 décrivent un premier exemple de fabrication d'un écran de couleurs selon l'invention. Comme illustré à la figure 1, une première étape du procédé consiste à maintenir un premier film 2 contre un poinçon 4. Plus précisément, le premier film 2 est maintenu contre une face d'appui 6 du poinçon par des moyens de maintien réversibles. À titre d'exemple, les moyens de maintien peuvent désigner un adhésif double face interposé entre le poinçon 4 et le premier film 2, ou bien des moyens de succion débouchant sur la face d'appui 6, de type ventouse. Le premier film 2 est configuré pour recouvrir toute la face d'appui 6 sans dépasser de celle-ci.The figures 1 to 4 describe a first example of the manufacture of a color screen according to the invention. As shown in figure 1 , a first step of the method consists in maintaining a first film 2 against a punch 4. More precisely, the first film 2 is held against a bearing face 6 of the punch by reversible holding means. By way of example, the holding means may designate a double-sided adhesive interposed between the punch 4 and the first film 2, or else suction means opening onto the bearing face 6, of the suction cup type. The first film 2 is configured to cover the entire bearing face 6 without protruding therefrom.

Le premier film 2 est en matière plastique, notamment en polyméthacrylate de méthyle (PMMA) ou en polycarbonate (PC). Il peut être incolore ou coloré, transparent ou translucide. Le premier film 2 peut également comporter des inclusions ou des irrégularités présentes à dessein à l'intérieur et/ou sur l'extérieur du film, afin de modifier l'incidence d'un faisceau lumineux le traversant. À titre d'exemple, le premier film 2 peut comporter des prismes de structure et d'angle prédéfinis, pour satisfaire aux exigences de la réglementation en la matière, connues de l'homme du métier. Le premier film 2 peut être composé d'un empilement de couches. L'empilement de couches peut comprendre une couche métallisée. La couche métallisée peut être recouverte de chaque côté par une couche adhésive, elle-même recouverte d'un côté par une couche d'ABS et, d'un autre côté par une couche de PMMA puis une couche de protection.The first film 2 is made of plastic, in particular polymethyl methacrylate (PMMA) or polycarbonate (PC). It can be colorless or colored, transparent or translucent. The first film 2 can also include inclusions or irregularities intentionally present inside and / or on the outside of the film, in order to modify the incidence of a light beam passing through it. By way of example, the first film 2 can comprise prisms of predefined structure and angle, to meet the requirements of the regulations in this area, known to those skilled in the art. The first film 2 can be composed of a stack of layers. The stack of layers can include a metallized layer. The metallized layer can be covered on each side by an adhesive layer, itself covered on one side by a layer of ABS and, on the other hand by a layer of PMMA and then a protective layer.

L'épaisseur du premier film, définie comme la distance séparant ses plus grandes faces 8, est comprise entre 0,375 mm et 0,5 mm. Selon le présent exemple, son épaisseur est de 0,5 mm.The thickness of the first film, defined as the distance separating its largest faces 8, is between 0.375 mm and 0.5 mm. According to the present example, its thickness is 0.5 mm.

Selon une autre étape du procédé, un deuxième film 10 est disposé sur une matrice 12 de sorte à recouvrir complètement une cavité 14 débouchant sur une face supérieure 16 de la matrice 12. La cavité 14 délimite une ouverture 18 au niveau de la face supérieure 16, dont le contour est de forme complémentaire au contour de la face d'appui 6. Plus précisément, le contour de l'ouverture 18 est légèrement supérieur au contour de la face d'appui afin de permettre l'insertion d'une partie du poinçon 4 dans la cavité 14. Autrement dit, la valeur du jeu de coupe entre le poinçon 4 et la matrice 12 est inférieure 0,5 mm, de préférence cette valeur tend vers zéro.According to another step of the method, a second film 10 is placed on a die 12 so as to completely cover a cavity 14 opening onto an upper face 16 of the die 12. The cavity 14 defines an opening 18 at the level of the upper face 16 , the contour of which is of complementary shape to the contour of the bearing face 6. More precisely, the outline of the opening 18 is slightly greater than the outline of the bearing face in order to allow the insertion of a part of the punch 4 in cavity 14. In other words, the value of the cutting clearance between punch 4 and die 12 is less than 0.5 mm, preferably this value tends towards zero.

Le deuxième film 10 est aussi en matière plastique, notamment en polyméthacrylate de méthyle (PMMA) ou en polycarbonate (PC). Il peut être incolore ou coloré, transparent ou translucide. Le deuxième film 10 peut également comporter des inclusions ou des irrégularités présentes à dessein à l'intérieur et/ou sur l'extérieur du film, afin de modifier l'incidence d'un faisceau lumineux le traversant. L'épaisseur du deuxième film, définie comme la distance séparant ses plus grandes faces 9, peut être est égale au premier film 2. Comme illustré à la figure 1, l'épaisseur du deuxième film est de préférence supérieure à l'épaisseur du premier film 2 pour les raisons indiquées ci-après. Selon le présent exemple, l'épaisseur du deuxième film 10 est de 1 mm. Il est à noter que le premier film 2 et le deuxième film 10 sont d'aspect visuel et/ou de couleurs différentes afin de délimiter des zones distinctives visuellement. Le deuxième film 10 se distingue du premier film 2 en ce qu'il se déforme plus aisément que le premier film afin de permettre une insertion plus aisée et un meilleur maintien du premier film par le deuxième film.The second film 10 is also made of plastic, in particular polymethyl methacrylate (PMMA) or polycarbonate (PC). It can be colorless or colored, transparent or translucent. The second film 10 can also include inclusions or irregularities intentionally present inside and / or on the outside of the film, in order to modify the incidence of a light beam passing through it. The thickness of the second film, defined as the distance separating its largest faces 9, may be equal to the first film 2. As illustrated in figure 1 , the thickness of the second film is preferably greater than the thickness of the first film 2 for the reasons indicated below. According to the present example, the thickness of the second film 10 is 1 mm. It should be noted that the first film 2 and the second film 10 have a visual appearance and / or different colors in order to delimit visually distinctive areas. The second film 10 differs from the first film 2 in that it deforms more easily than the first film in order to allow easier insertion and better maintenance of the first film by the second film.

Selon une autre étape dite de compression illustrée à la figure 2, le poinçon 4 et la matrice 12 sont alignés et rapprochés de manière à ce que le premier film 2 comprime le deuxième film 10 jusqu'à détacher et faire chuter une partie 11 du deuxième film dans le fond 20 de la cavité 14. Bien entendu, la cavité 14 est suffisamment profonde pour accueillir la partie 11 ou débouchure du deuxième film. En d'autres termes, le premier film 2 poinçonne le deuxième film 10 de manière à former un passage 22 à travers le deuxième film. De préférence, le passage 22 s'étend normalement aux plus grandes faces 9 de la deuxième couche 10.According to another so-called compression step illustrated in figure 2 , the punch 4 and the die 12 are aligned and brought together so that the first film 2 compresses the second film 10 until it detaches and drops part 11 of the second film into the bottom 20 of the cavity 14. Of course , the cavity 14 is deep enough to accommodate the part 11 or the opening of the second film. In other words, the first film 2 punches the second film 10 so as to form a passage 22 through the second film. Preferably, the passage 22 extends normally to the larger faces 9 of the second layer 10.

Selon une autre étape dite de positionnement illustrée à la figure 3, le poinçon 4 et la matrice 12 sont ensuite écartés de manière à positionner le premier film 2 dans le passage 22. De préférence, le premier film 2 est positionné de sorte à affleurer une grande face 9 du deuxième film 10. Selon une variante non représentée, le premier film 2 est positionné de manière à être en retrait des grandes faces 9 du deuxième film 10.According to another so-called positioning step illustrated in figure 3 , the punch 4 and the die 12 are then moved apart so as to position the first film 2 in the passage 22. Preferably, the first film 2 is positioned so as to be flush with a large face 9 of the second film 10. According to a non-variant. shown, the first film 2 is positioned so as to be set back from the large faces 9 of the second film 10.

Le procédé ici décrit permet ainsi d'obtenir un écran de couleurs 24A tel qu'illustré à la figure 4, comprenant un premier film 2 inséré dans un deuxième film 10 afin de délimiter au niveau d'une même surface des zones distinctes visuellement. Par exemple, le premier film et le deuxième film peuvent respectivement être d'apparence chromée et de couleur rouge ou inversement. De façon avantageuse, le premier film 2 ne dépasse pas du deuxième film 10 ce qui permet d'une part de former un écran de couleurs 24A dont l'épaisseur est limitée au film le plus épais, dans le cas présent le deuxième film 10, et d'autre part de permettre un recouvrement plus homogène de l'écran de couleurs 24A par une autre couche si besoin, par exemple une couche de protection. En effet, le premier film 2 peut être positionné de manière à affleurer une grande face 9 du deuxième film afin de former une surface lisse, favorable au dépôt d'une couche régulière. Selon un autre avantage, le premier et le deuxième film ne se superposent pas ce qui permet de préserver les propriétés de transmission de la lumière de chaque film.The method described here thus makes it possible to obtain a color screen 24A as illustrated in figure 4 , comprising a first film 2 inserted into a second film 10 in order to delimit visually distinct zones at the level of the same surface. For example, the first film and the second film may respectively be chrome in appearance and red in color or vice versa. Advantageously, the first film 2 does not protrude from the second film 10 which makes it possible, on the one hand, to form a color screen 24A whose thickness is limited to the thickest film, in this case the second film 10, and on the other hand to allow a more homogeneous covering of the color screen 24A by another layer if necessary, for example a protective layer. In fact, the first film 2 can be positioned so as to be flush with a large face 9 of the second film in order to form a smooth surface, favorable to the deposition of a regular layer. According to another advantage, the first and the second film do not overlap this which preserves the light transmission properties of each film.

Dans l'exemple décrit ci-dessus, il est à noter que le premier film 2 est de forme et de dimensions adaptées afin de se superposer parfaitement à la face d'appui 6 du poinçon 4 (voir figure 1). Toutefois, il peut s'avérer que cela ne soit pas le cas et qu'il soit nécessaire de mettre en forme préalablement le premier film. Les figures 5 et 6 illustrent un procédé de mise en forme du premier film 2 consistant à poinçonner le premier film contre la matrice 12 de sorte à retirer les parties 26 du premier film 2 dépassant de la face d'appui 6. Bien entendu, les étapes illustrées par les figures 5 et 6 s'effectuent préalablement aux étapes illustrées aux figures 1 à 3.In the example described above, it should be noted that the first film 2 is of suitable shape and dimensions in order to be perfectly superimposed on the bearing face 6 of the punch 4 (see figure 1 ). However, it may turn out that this is not the case and that it is necessary to format the first film beforehand. The figures 5 and 6 illustrate a method of shaping the first film 2 consisting in punching the first film against the die 12 so as to remove the parts 26 of the first film 2 projecting from the bearing face 6. Of course, the steps illustrated by the figures 5 and 6 are carried out prior to the steps illustrated in figures 1 to 3 .

Les figures 7 à 12 illustrent à présent un deuxième exemple de réalisation d'un procédé d'un écran de couleurs 24B selon l'invention. Cet exemple se distingue du premier exemple en ce que le premier film 2 est à présent maintenu au poinçon 4 par l'intermédiaire de poinçons auxiliaires 28. Pour cela, le premier film est placé sur une matrice auxiliaire 30 de sorte à recouvrir complètement deux cavités 32 distinctes et débouchant sur une face supérieure 34 de la matrice auxiliaire 30. Chaque cavité 32 délimite ainsi une ouverture 36 au niveau de la face supérieure 34. Chaque poinçon auxiliaire 28 est de forme complémentaire aux ouvertures 34 de la matrice auxiliaire 30, de sorte que la valeur du jeu de coupe entre les poinçons auxiliaires 28 et la matrice auxiliaire 30 est inférieure 0,5 mm, de préférence cette valeur tend vers zéro. Le poinçon 4 est positionné au-dessus du premier film 2 de sorte que chaque poinçon auxiliaire 28 est en vis-à-vis avec une cavité 32.The figures 7 to 12 now illustrate a second exemplary embodiment of a method of a color screen 24B according to the invention. This example differs from the first example in that the first film 2 is now held at the punch 4 by means of auxiliary punches 28. For this, the first film is placed on an auxiliary die 30 so as to completely cover two cavities. 32 distinct and opening onto an upper face 34 of the auxiliary die 30. Each cavity 32 thus defines an opening 36 at the level of the upper face 34. Each auxiliary punch 28 has a shape complementary to the openings 34 of the auxiliary die 30, so that the value of the cutting clearance between the auxiliary punches 28 and the auxiliary die 30 is less than 0.5 mm, preferably this value tends towards zero. The punch 4 is positioned above the first film 2 so that each auxiliary punch 28 faces a cavity 32.

Le poinçon 4 et la matrice auxiliaire 30 sont ensuite rapprochés de sorte que chaque poinçon auxiliaire 28 traverse complètement le premier film 2 comme illustré par la figure 8. Ainsi, de façon avantageuse, les poinçons auxiliaires 28 maintiennent le premier film 2 contre la surface d'appui 6 du poinçon, jouant ainsi le rôle de moyens de maintien décrit ci-dessus. Comme illustré aux figures 9 et 10, les poinçons auxiliaires 28 sont configurés pour maintenir le premier film 2 au poinçon 4 lors du procédé de réalisation d'un écran de couleurs décrit ci-dessus. Plus précisément, les parois latérales 38 des poinçons auxiliaires 28 sont configurées pour maintenir le premier film 2 par un phénomène de frottement mécanique. À cet effet, les parois latérales 38 peuvent comporter un grainage ou des rainures (non représentées sur les figures) afin de favoriser ce phénomène. Les figures 9 et 11 représentent des étapes similaires à celles représentées aux figures 1 à 3.The punch 4 and the auxiliary die 30 are then brought together so that each auxiliary punch 28 completely passes through the first film 2 as illustrated by figure 8 . Thus, advantageously, the auxiliary punches 28 hold the first film 2 against the bearing surface 6 of the punch, thus playing the role of the holding means described above. As shown in figures 9 and 10 , the auxiliary punches 28 are configured to hold the first film 2 to the punch 4 during the process of making a color screen described above. More precisely, the side walls 38 of the auxiliary punches 28 are configured to hold the first film 2 by a phenomenon of mechanical friction. To this end, the side walls 38 may include a graining or grooves (not shown in the figures) in order to promote this phenomenon. The figures 9 and 11 represent steps similar to those shown in figures 1 to 3 .

Ce deuxième exemple de réalisation permet d'obtenir un écran de couleurs 24B tel qu'illustré à la figure 12, comprenant un premier film 2 inséré dans un deuxième film 10 afin de délimiter visuellement des zones distinctes au niveau d'une même surface. À la différence du premier exemple décrit ci-dessus, le premier film 2 comporte à présent deux passages 40 formés par les poinçons auxiliaires 28. Ce mode de réalisation est particulièrement avantageux pour ménager des ouvertures dans le premier film qui peuvent éventuellement être obturées par un troisième film non représenté, selon l'un des procédés décrits ci-dessus. En d'autres termes, ce deuxième exemple de réalisation de l'invention peut permettre de former des films comprenant un premier film inséré dans un deuxième film et un troisième film inséré dans le premier film. Les trois films peuvent être identiques ou différents afin de former un motif imbriqué complexe.This second exemplary embodiment makes it possible to obtain a color screen 24B as illustrated on figure 12 , comprising a first film 2 inserted into a second film 10 in order to visually delimit distinct zones at the same surface. Unlike the first example described above, the first film 2 now comprises two passages 40 formed by the auxiliary punches 28. This embodiment is particularly advantageous for providing openings in the first film which may optionally be closed by a third film not shown, according to one of the methods described above. In other words, this second exemplary embodiment of the invention can make it possible to form films comprising a first film inserted into a second film and a third film inserted into the first film. The three films can be the same or different to form a complex nested pattern.

Dans ce deuxième exemple, il est à noter que le premier film 2 est de forme et de dimensions adaptées afin de se superposer parfaitement à la face d'appui du poinçon 4 (voir figure 8). Toutefois, il peut s'avérer que cela ne soit pas le cas et qu'il soit nécessaire de mettre préalablement en forme le premier film. Les figures 13 à 16 illustrent un procédé de mise en forme du premier film 2 consistant à poinçonner le premier film contre la matrice auxiliaire 30 de sorte à retirer les parties 40 du premier film 2 dépassant de la face d'appui 6. Naturellement, les étapes illustrées par les figures 13 à 16 s'effectuent préalablement aux étapes illustrées aux figures 7 à 11.In this second example, it should be noted that the first film 2 is of suitable shape and dimensions so as to be perfectly superimposed on the bearing face of the punch 4 (see figure 8 ). However, it may turn out that this is not the case and that it is necessary to format the first film beforehand. The figures 13 to 16 illustrate a method of shaping the first film 2 consisting in punching the first film against the auxiliary die 30 so as to remove the parts 40 of the first film 2 projecting from the bearing face 6. Naturally, the steps illustrated by the figures 13 to 16 are carried out prior to the steps illustrated in figures 7 to 11 .

Il est à noter que dans les exemples décrits ci-dessus les films sont plans. Toutefois, comme mentionné précédemment, l'invention ne se limite pas à l'utilisation de films plans. L'homme du métier peut donc aisément adapter les exemples ci-dessus pour réaliser des écrans bombés à partir de premier(s) et deuxième(s) films courbés.It should be noted that in the examples described above the films are flat. However, as mentioned above, the invention is not limited to the use of flat films. Those skilled in the art can therefore easily adapt the above examples to make curved screens from first (s) and second (s) curved films.

Bien entendu, diverses autres modifications au dispositif selon l'invention peuvent être envisagées dans le cadre des revendications annexées.Of course, various other modifications to the device according to the invention can be envisaged within the framework of the appended claims.

Claims (15)

  1. A method for making a colour screen (24A, 24B) for a lighting and/or signalling device for a motor vehicle, characterized in that it implements the following steps:
    - a step of pressing a first film (2) against a second film (10) of larger surface, in such a way that the first film (2) perforates the second film (10) and forms that way a passage (22) at the size of the first film (2), the first and the second film being made of plastic material and of different colours, then
    - a step of positioning the first film (2) into the passage (22) in such a way as to plug said passage (22).
  2. The method according to one of the preceding claims, characterized in that the first film (2) has a thickness between 0.3 mm and 0.8 mm, preferably of the order of 0.5 mm.
  3. The method according to one of the preceding claims, characterized in that the first film (2) is thinner than the second film (10).
  4. The method according to the preceding claim, characterized in that the first film (2) is positioned into the second film (10) in such a way as to make flush with and/or to set back from a large face (9) of the second film (10).
  5. The method according to one of the preceding claims, characterized in that the first film (2) is less easily deformed than the second film (10), under a same mechanical stress applied perpendicular to their largest faces (8, 9).
  6. The method according to one of the preceding claims, characterized in that the first film (2) and/or the second film (10) is at least partially curved.
  7. The method according to one of the preceding claims, characterized in that the first film (2) and/or the second film (10) is composed of a stack of layers.
  8. The method according to one of the preceding claims, characterized in that the method is reproduced in such a way as to make a colour screen comprising several first films (10).
  9. The method according to one of the preceding claims, characterized in that, before the pressing step, the second film (10) is positioned against an upper face (16) of a mould (12), the upper face (16) comprising at least one opening (14) having a shape complementary to the contour of the first film (2) in such a way as to receive the part (11) of the second film (10) that is detached by the first film (2) during the pressing step.
  10. The method according to the preceding claim, characterized in that, before the pressing step, the contour of the first film (2) is cut in such a way as to have a shape complementary to the opening (18) of the mould (12).
  11. The method according to the preceding claim, characterized in that the value of the cutting gap between the first film (2) and the opening (18) of the mould (12) is between 0.01 and 0.1 mm.
  12. The method according to one of the preceding claims, characterized in that the opposite largest faces (8) of the first film (2) are connected by at least one passage (40).
  13. The method according to the preceding claim, characterized in that at least one passage (40) is made using an auxiliary punch (28), and in that the auxiliary punch (28) is inserted into the first film (2) before the step of pressing the first film against the second film (10), and in that the auxiliary punch (28) is removed from the first film (2) after the step of positioning the first film (2) into the second film (10).
  14. The method according to the preceding claim, characterized in that the auxiliary punch (28) is mounted on a punch (4) in such a way that the auxiliary punch (28) protrudes from a bearing face (6) of the punch (4) and in that said bearing face (6) substantially or preferably perfectly overlaps the first film (2) during the punching thereof by the auxiliary punch (28).
  15. The method according to the preceding claim, characterized in that the bearing face (6) has the same shape as the first film (2), in such a way that the first film (2) is in contact with the whole bearing face (6) during the punching thereof by the auxiliary punch (28).
EP18783055.9A 2017-09-08 2018-09-06 Method for making a colour screen for a motor vehicle lighting and/or signalling device Active EP3679292B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18783055T PL3679292T3 (en) 2017-09-08 2018-09-06 Method for making a colour screen for a motor vehicle lighting and/or signalling device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1758307A FR3071031B1 (en) 2017-09-08 2017-09-08 METHOD FOR PRODUCING A COLOR SCREEN FOR A LIGHTING AND / OR SIGNALING DEVICE FOR A MOTOR VEHICLE
PCT/FR2018/052185 WO2019048792A1 (en) 2017-09-08 2018-09-06 Method for making a colour screen for a motor vehicle lighting and/or signalling device

Publications (2)

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EP3679292A1 EP3679292A1 (en) 2020-07-15
EP3679292B1 true EP3679292B1 (en) 2021-07-14

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EP (1) EP3679292B1 (en)
FR (1) FR3071031B1 (en)
PL (1) PL3679292T3 (en)
WO (1) WO2019048792A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050132861A1 (en) * 2003-12-22 2005-06-23 Deng Guo R. Apparatus for forming die cuts
WO2012044887A1 (en) * 2010-09-30 2012-04-05 Performance Indicator, Llc. Photolytically and environmentally stable multilayer structure for high efficiency electromagentic energy conversion and sustained secondary emission
US9500333B1 (en) * 2015-12-18 2016-11-22 Ford Global Technologies, Llc Phosphorescent lighting assembly

Also Published As

Publication number Publication date
FR3071031A1 (en) 2019-03-15
FR3071031B1 (en) 2019-09-06
PL3679292T3 (en) 2021-12-27
WO2019048792A1 (en) 2019-03-14
EP3679292A1 (en) 2020-07-15

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