EP3679292A1 - 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 deviceInfo
- Publication number
- EP3679292A1 EP3679292A1 EP18783055.9A EP18783055A EP3679292A1 EP 3679292 A1 EP3679292 A1 EP 3679292A1 EP 18783055 A EP18783055 A EP 18783055A EP 3679292 A1 EP3679292 A1 EP 3679292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- punch
- passage
- auxiliary
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000011664 signaling Effects 0.000 title claims abstract description 10
- 239000003086 colorant Substances 0.000 claims abstract description 11
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 239000011159 matrix material Substances 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 230000000295 complement effect Effects 0.000 claims description 6
- 238000004080 punching Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 14
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 7
- 239000004926 polymethyl methacrylate Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000009131 signaling function Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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 of producing a plastic color screen comprising at least one film inserted in another film of different color. It relates more particularly to the manufacture of a color screen for a lighting and / or signaling device for a motor vehicle, lantern type or projector. State of the art
- the most common solution is to place at the front of the lighting device a single screen comprising areas of different colors more or less transparent. Each color is associated with a lighting or signaling function mentioned above.
- the lighting device then has a separate light source to illuminate each color area, which allows to use a single screen incorporating all the functions imposed by the regulations.
- the use of a single color screen significantly reduces the size of the lighting device compared to devices using multiple screens of different colors.
- the color screen is made from a transparent support on which films of different colors are superimposed.
- the transparent support and / or the superposition of the color films alters the optical properties of each film, in particular their color and their light transmission properties.
- the superposition of the films color on the transparent support increases the thickness of the screen, which can be problematic when you want to limit the size of the lighting device.
- the color films are held on the transparent support by means of adhesives which alter the optical properties of the color 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 specifically, the invention seeks to provide a method of producing a screen comprising zones of different colors, whose light transmission properties are preserved during the manufacture of the screen and over time.
- the present application proposes a method of producing a color screen for a lighting and / or signaling device for a motor vehicle, implementing the following steps:
- the first film is compressed against the second film in order to detach part of the second film and replace this 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 allows the realization of a color screen comprising two zones of different colors without using a support transparent as mentioned above.
- 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 forced into the second film so as to be maintained by the latter.
- No glue or chemical agent is therefore used to maintain the films, which preserves their light transmission properties over time.
- the first and second films do not overlap.
- the insertion of the first film into the second film can thus be performed independently of their optical properties, offering a greater variety of use of color 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 maintain its shape.
- the first and / or second film may be previously manufactured by a thermoforming technique.
- the first film is positioned in the second film so as to be flush with and / or be set back from a large face of the second film.
- the first film is arranged so as to be flush with a larger face of the second film, so that at the level of 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, to facilitate the insertion of the first film in the second film, while preserving the shape of the first film.
- this embodiment allows a better mechanical maintenance 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 a aspect ratio of between 1: 1 and 1: 20.
- the outline of the first film may thus delimit an oval, circular, rectangular, square, triangular or other shape.
- the first film can be of varied and diverse forms.
- the first film and / or the second film is at least partially curved.
- the first and / or second film are not planar and may include one or more inflection points at one of their large faces.
- the first film and the second film have the same shape, or substantially the same or the same radii of curvature.
- the first film and / or the second film is composed of a stack of layers.
- the first and / or second film may comprise at least one metallized layer.
- the metallized layer is of chrome appearance, and / or of blue color.
- the metallized layer is sandwiched between two polymeric plastic layers, 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 different colors and shapes or identical.
- the second film before or before the compression step described above, is positioned against an upper face of a matrix, the upper face comprising at least one opening of complementary shape to the contour of the first film so as to receive the portion of the second film which is detached by the first film during the compression step.
- the portion of the second film detached by the first film commonly called knockout, is thus expelled into the opening present at the upper face of the matrix during the compression step.
- knockout the portion of the second film detached by the first film
- the contour of the first film prior to the compression step, is cut so as to have a shape complementary to the opening of the matrix.
- the value of the clearance between the first film and the opening of the matrix is between 0.01 and 0.1 mm, preferably zero.
- the first film is shaped before the compression step so that the contour of the first film and the contour of the opening of the matrix are substantially the same, preferably identical.
- the largest opposite faces of the first film are connected by at least one passage.
- the passage or passages extend in a normal direction to the larger faces.
- at least one passage is made using an auxiliary punch, the auxiliary punch is inserted into the first film prior to the compression step of 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 method of producing the color screen according to the invention.
- the auxiliary punch allows to provide a passage in the first film which can be filled by a third film according to a method described above.
- the auxiliary punch is mounted on a punch so that the auxiliary punch is projecting from a bearing face of the punch, and said bearing face is superimposed substantially or preferably perfectly to the first film when punched 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 during its punching by the auxiliary punch.
- the present invention also relates to a lighting and / or signaling device for a motor vehicle comprising a color screen made according to one of the methods described above.
- FIGS. 1 to 3 illustrate the steps of a first example of a method of producing a color screen according to the invention
- FIG. 4 illustrates a front view of a color screen obtained according to the method illustrated in FIGS. 1 to 3;
- FIGS. 5 and 6 illustrate a step of shaping a first film prior to the process illustrated in FIGS. 1 to 3.
- FIGS. 7 to 11 illustrate the steps of a second example of a method of producing a color screen according to the invention
- FIG. 12 illustrates a front view of a color screen obtained according to the method illustrated in FIGS. 7 to 11;
- FIGS. 13 and 16 illustrate a step of shaping a first film prior to the process illustrated in FIGS. 7 to 11.
- the invention proposes a method of producing a color screen for a lighting and / or signaling device for a motor vehicle, comprising zones of different colors, whose transmission properties of the light are preserved during screen making and over time.
- Figures 1 to 4 describe a first example of manufacture of a color screen according to the invention.
- a first step of the method consists in maintaining a first film 2 against a punch 4. More specifically, 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 suction means opening on the bearing surface 6, suction-type.
- 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 may also include inclusions or irregularities present intentionally inside and / or on the outside of the film, in order to modify the incidence of a light beam passing therethrough.
- the first film 2 may comprise prisms of defined structure and angle, to meet the requirements of the regulations in the field, known to those skilled in the art.
- the first film 2 may be composed of a stack of layers.
- the stack of layers may comprise 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 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 disposed on a matrix 12 so as to completely cover a cavity 14 opening on an upper face 16 of the matrix 12.
- the cavity 14 defines an opening 18 at the level of the upper face 16, whose contour is of complementary shape to the contour of the bearing face 6. More specifically, the contour of the opening 18 is slightly greater than the contour of the bearing face to allow the insertion of a portion of the punch 4 in the cavity 14. In other words, the value of the cutting clearance between the punch 4 and the die 12 is less than 0.5 mm, preferably this value tends to 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 may 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 therethrough.
- 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 FIG. 1, the thickness of the second film is preferably greater than the thickness of the first film. film 2 for the reasons indicated below. According to the present example, the thickness of the second film 10 is 1 mm.
- first film 2 and the second film 10 are of visual appearance and / or of different colors in order to delimit visually distinctive zones.
- the second film 10 differs from the first film 2 in that it deforms more easily than the first film 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 to detach and drop part 1 1 of the second film in the bottom 20 of the cavity 14.
- the cavity 14 is deep enough to accommodate the portion 1 1 or 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 normally extends to the larger faces 9 of the second layer 10.
- the punch 4 and the die 12 are then spaced apart so as to position the first film 2 in the passage 22.
- the first film 2 is positioned so that flush a large face 9 of the second film 10.
- the first film 2 is positioned 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 FIG. 4, comprising a first film 2 inserted in a second film 10 in order to delimit at the level of the same surface distinct zones. visually.
- the first film and the second film can respectively be of chrome appearance and red color or vice versa.
- the first film 2 does not protrude from the second film 10, which on the one hand makes it possible to form a color screen 24A whose thickness is limited to the thickest film, in this case the second film 10, and secondly to allow a more homogeneous recovery 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 flush with a large face 9 of the second film to form a smooth surface, favorable to the deposition of a regular layer.
- the first and second films do not overlap this which preserves the light transmission properties of each film.
- FIGS. 5 and 6 illustrate a method of shaping the first film 2 of punching the first film against the die 12 so as to remove the portions 26 of the first film 2 protruding from the bearing face 6.
- the steps illustrated in Figures 5 and 6 are carried out prior to the steps illustrated in Figures 1 to 3.
- FIGS 7 to 12 now illustrate a second 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 separate cavities 32 and opening on an upper face 34 of the auxiliary die 30.
- Each cavity 32 thus defines an opening 36 at the upper face 34
- Each auxiliary punch 28 is of complementary shape 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 is vis-Ã -vis with 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 in FIG. 8.
- the auxiliary punches 28 hold the first film 2 against the bearing surface 6 of the punch, thus playing the role of holding means described above.
- the auxiliary punches 28 are configured to hold the first film 2 to the punch 4 during the process of producing a color screen described above.
- the side walls 38 of the auxiliary punches 28 are configured to maintain the first film 2 by a mechanical friction phenomenon.
- the side walls 38 may comprise a graining or grooves (not shown in the figures) to promote this phenomenon.
- 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 in FIG. 12, comprising a first film 2 inserted in a second film 10 in order to visually delimit distinct zones at the same level. area.
- 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 embodiment of the invention can make it possible to form films comprising a first film inserted in a second film and a third film inserted in the first film.
- the three films may be the same or different to form a complex nested pattern.
- FIGS. 13 to 16 illustrate a method of shaping the first film 2 of punching the first film against the auxiliary die 30 so as to remove the portions 40 of the first film 2 protruding from the bearing face 6. Naturally, the steps illustrated in Figures 13 to 16 are carried out prior to the steps illustrated in Figures 7 to 1 1.
- the films are flat.
- the invention is not limited to the use of flat films. The skilled person can therefore easily adapt the above examples to make curved screens from first (s) and second (s) curved films.
Landscapes
- 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)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
Description
Claims
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)
Publication Number | Publication Date |
---|---|
EP3679292A1 true EP3679292A1 (en) | 2020-07-15 |
EP3679292B1 EP3679292B1 (en) | 2021-07-14 |
Family
ID=61258300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18783055.9A Active EP3679292B1 (en) | 2017-09-08 | 2018-09-06 | Method for making a colour screen for a motor vehicle lighting and/or signalling device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3679292B1 (en) |
FR (1) | FR3071031B1 (en) |
PL (1) | PL3679292T3 (en) |
WO (1) | WO2019048792A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050132861A1 (en) * | 2003-12-22 | 2005-06-23 | Deng Guo R. | Apparatus for forming die cuts |
US8415642B2 (en) * | 2010-09-30 | 2013-04-09 | Performance Indicator, Llc | Photolytically and environmentally stable multilayer structure for high efficiency electromagnetic energy conversion and sustained secondary emission |
US9500333B1 (en) * | 2015-12-18 | 2016-11-22 | Ford Global Technologies, Llc | Phosphorescent lighting assembly |
-
2017
- 2017-09-08 FR FR1758307A patent/FR3071031B1/en active Active
-
2018
- 2018-09-06 EP EP18783055.9A patent/EP3679292B1/en active Active
- 2018-09-06 PL PL18783055T patent/PL3679292T3/en unknown
- 2018-09-06 WO PCT/FR2018/052185 patent/WO2019048792A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR3071031B1 (en) | 2019-09-06 |
WO2019048792A1 (en) | 2019-03-14 |
PL3679292T3 (en) | 2021-12-27 |
EP3679292B1 (en) | 2021-07-14 |
FR3071031A1 (en) | 2019-03-15 |
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