EP3424267A1 - Procede de traitement d'une glace transparente pour un dispositif d'eclairage et/ou de signalisation pour vehicule automobile - Google Patents
Procede de traitement d'une glace transparente pour un dispositif d'eclairage et/ou de signalisation pour vehicule automobileInfo
- Publication number
- EP3424267A1 EP3424267A1 EP17707853.2A EP17707853A EP3424267A1 EP 3424267 A1 EP3424267 A1 EP 3424267A1 EP 17707853 A EP17707853 A EP 17707853A EP 3424267 A1 EP3424267 A1 EP 3424267A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- ice
- binder
- lighting
- mth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
Definitions
- the present invention relates to a method of processing a transparent ice for a lighting and / or signaling device for a motor vehicle. It also relates to a lighting and / or signaling device for an associated motor vehicle.
- a process for the treatment of a transparent glass for a motor vehicle comprises, in a manner known to those skilled in the art, the application of a resistive element composed of wires metal on transparent ice. When powered by a current, the resistive element dissipates a power that heats said transparent ice. This makes it possible to defrost the ice.
- This method of treatment is used in particular for a rear windshield glass motor vehicle.
- a disadvantage of this state of the art is that such a resistive element can not be used for a lighting and / or signaling device. Indeed, the metallic son of the resistive element that are visible to the naked eye can not be applied to a lighting and / or signaling device such as a projector for example because they may significantly change the properties optics of the transparent glass of the projector.
- the present invention aims to solve the aforementioned drawback.
- the invention proposes a process for treating a transparent ice for a lighting and / or signaling device for a motor vehicle to perform a defrosting function and / or an anti-condensation function on said ice, according to which the treatment method comprises:
- the method for treating a transparent glass of a lighting and / or signaling device for a motor vehicle may also comprise one or more additional characteristics taken alone or in combination from the following :
- the transparent ice is made of synthetic polymer.
- the method further comprises the application of a surfactant to said ice prior to depositing said coating.
- the coating further comprises an alcoholic solvent; -
- the polymerization of said coating is carried out by thermal baking or by means of ultraviolet.
- depositing said coating on the ice is done by spraying or spraying.
- the transparent conducting metal oxides are the following oxides, taken alone or in combination from:
- ITO indium tin oxide
- tantalum oxide Ta205 tantalum oxide Ta205
- the binder is a neutral binder based on acrylic or based on polyester or on the basis of polymers.
- the binder is a conductive binder based on electrically conductive polymers.
- the deposition of the coating on the ice is carried out so as to obtain a coating thickness e of between 0.3 ⁇ and 10 ⁇ .
- the binder (L) comprises an average degree of polymerization (DP) of between 100 and 1000 monomers.
- a lighting and / or signaling device for a motor vehicle comprising a housing and a transparent glass assembled to said housing, wherein said glass comprises an electrically conductive coating on at least one inner face, said coating being based on inorganic material and composed of a binder and transparent conductive metal oxides.
- the lighting and / or signaling device for a motor vehicle may also comprise one or more additional characteristics taken alone or in combination from the following:
- the transparent conducting metal oxides are composed of the following oxides, taken alone or in combination from:
- ITO indium tin oxide
- tantalum oxide Ta205 tantalum oxide Ta205
- the binder is a neutral binder based on acrylic or polyester-based; or based on polymers.
- the binder is a conductive binder based on conductive polymers.
- the coating comprises a thickness e between 0.3 ⁇ and 10 ⁇ .
- said lighting and / or signaling device is a projector.
- FIG. 1 represents a flow diagram of the process for treating a transparent ice of a lighting and / or signaling device according to a non-limiting embodiment of the invention
- FIG. 2 is a schematic side view of the lighting and / or signaling device comprising a transparent crystal treated by the treatment method of FIG. 1;
- FIG. 3 is an enlarged schematic view of a transparent ice portion of FIG. DESCRIPTION OF EMBODIMENTS OF THE INVENTION
- the method MTH for processing a transparent glass G for a lighting and / or signaling device P for a motor vehicle V is illustrated in FIG. 1 in a nonlimiting embodiment.
- the MTH treatment method makes it possible to perform a Ft1 defrosting function and Ft2 anti-condensation function on the transparent ice G.
- the frost may form on the outer face s2 as well as on the inner face s1 of the transparent ice G when it is integrated in a lighting and / or signaling device P for a motor vehicle V.
- the condensation or fog is formed mainly on the inner face s1 of the transparent glass G.
- the lighting and / or signaling device P is a projector.
- a vehicle projector P is an element that breathes during use, through ventilation arranged in its housing. There is thus a more or less humid air exchange between the outside environment and the interior of the projector P. In fact, condensation can occur due to a temperature difference between the inner face s1 of the ice G and the outer face s2 of the ice G which is colder. Depending on the temperature, this mist can even freeze and form a layer of frost.
- a projector P more and more often incorporates light sources that are semiconductor emitter chips such as LED light emitting diodes. These LEDs give off less energy thermal than conventional light sources such as filament halogen lamps and therefore do not heat the inner side of the glass G. Also, with the use of said LEDs, there is more risk of condensation on the inner side s1 of said transparent ice G. This condensation phenomenon is all the more troublesome that it is visible by an observer because the ice G is transparent, unlike rear lights of a motor vehicle whose ice is tinted. It will be noted that the rear lights are less exposed to this phenomenon of condensation or frost than the headlamps P because:
- a projector P is illustrated in FIG. 2. As can be seen, such a projector P comprises in a non-limiting embodiment :
- the MTH treatment process is implemented on the transparent ice G before placing said ice-cream G on the outer casing 21 to close it.
- the ice G is subsequently attached to the housing 21 and generally glued.
- This method of MTH processing thus easily integrates into an already existing manufacturing process of a projector P, as it is related to ice. It is thus possible to propose standard versions of the projector without the defrosting or defogging function and the special versions of these projectors with these functions, while having an ice cream on which the R coating has been applied as well as arrangements of the housing for the power supply of said coating.
- the MTH method makes it possible to obtain an electrically conductive layer which is the coating R on the surface of the ice G and, by heating the transparent ice G, makes it possible to perform a defrosting function Ft1 on said transparent ice G and an anti-condensation function Ft2 on said ice cream G.
- the coating R is thus conductive to convey the current supplied by a power source, and is also resistive to release heat so as to heat the transparent ice.
- the MTH method comprises:
- an electrically conductive coating R on at least one inner face s1 of said ice-cream G (illustrated function APP (R (L, OTC)), s1, G)), said coating R being based on inorganic material and composed of a binder L and OTC transparent metal oxides; and
- the coating R is also called film or varnish.
- the transparent ice G is made of synthetic polymer.
- the transparent lens of a projector P is conventionally made of plastic.
- said transparent ice G is polycarbonate.
- the coating R is deposited on the inner face s1 of the ice G. This allows the desired Ft1 defrost and Ft2 anti-condensation functions to be performed. Indeed, condensation appears mainly on the inner face s1 of the transparent ice G. Moreover, the fact of applying a voltage on the glass G, the latter, thanks to the resistive coating R, will heat and melt the frost which covers the outer face s2 or the inner face s1 of the ice G. In addition, the thermal energy released by the resistive coating R will help prevent air from condensing on the inner surface s1 of the ice G.
- the coating R is deposited preferably over the entire extent of the inner face of the transparent ice G.
- zones that can be determined by thermal simulation or by observation during the development phases of the lighting device and the vehicle in which it is integrated.
- the deposition of the coating R on the transparent ice G is done by watering (called flow-coating).
- Watering allows to deposit the coating R by means of a jet which flows on the ice G.
- the surplus of coating is recovered in a collecting tank by gravity or by rotation of the ice G.
- the ice G can be placed in an inclined position so as to facilitate access to hard-to-reach areas on the interior surface s1 by the watering machine.
- These hard-to-access areas are so-called off-area zones or masked areas that correspond to areas of the ice-cream G not illuminated by the light sources of the spotlight P when they are on. These areas are those on which the condensation is the most important since they are the coldest areas of the ice G because unheated by the light sources.
- the deposition of the coating R on the transparent ice G is by spray (called “spray-coating”).
- the coating is mixed with compressed air to produce a jet that is sprayed with a gun onto the inner surface S1 of the ice G.
- the depositing of the dip coating R (dip-coating) is not used if it is desired to cover only the inside face s1 of the ice-cream G, since in this case all the ice-cream G is immersed in a coating bath R.
- the outer face s2 and the inner face s1 are covered with the coating R.
- the deposition of the coating R on the ice-cream G is carried out so as to obtain a coating thickness R included, inclusive, between 0.3 ⁇ and 10 ⁇ (after drying), preferably between 0, 5 and 1 ⁇ , terminals included. It will be noted that the parameterization of the conventionally used deposition lines makes it possible to obtain a determined thickness e.
- the thickness e of the coating R is a function of the inclination of the ice G, the viscosity of the coating R, the amount of solvent So used (described more away) and its evaporation.
- the MTH treatment method comprises the deposition of one or more layers of coating R on the transparent ice G.
- a small thickness e between 0.3 ⁇ and 10 ⁇ .
- This small thickness e of coating R makes it possible to preserve the optical properties of the transparent ice G. It is thus unnecessary to add an additional refractive layer. The path of the light beam formed by the light rays of the light sources is thus not disturbed. In addition, it does not alter the transparency effect of the ice G.
- this thin thickness e allows almost instantaneous drying of the coating R on the ice G.
- this small thickness e makes it possible to obtain a defrosting in 20 minutes maximum in static mode simulating a stationary vehicle and cold engine, when the ice G is powered with a voltage of 12V in a non-limiting example.
- the MTH treatment process further comprises the application of a surfactant S on said ice-cream G beforehand. depositing said coating R (function shown in dashed lines in FIG. 1 APP (S, G)).
- the surfactant S is a primer that modifies the surface tension of the transparent ice G to obtain a wettability effect and thus create a superior adhesion on said ice G. This makes it possible to deposit the coating R in a homogeneous and continuous manner and thus better check the thickness e deposited on the entire surface of the ice G.
- the coating R may form droplets which cause a rupture of said coating. Due to this rupture, the electrical conductivity of the coating R can lose efficiency.
- the surfactant S is soapy water.
- the polymerization of the coating R makes it possible to create monomer chains in the binder L in which the OTC metal oxides are integrated.
- the polymerization of the coating R is carried out by thermal baking (function shown in dashed lines in FIG. 1 CK (R)).
- Thermal cooking makes it possible to desolvenate the varnish R, namely to remove the solvent So (described later) which is used if appropriate.
- the solvent So is not trapped in the layer of varnish R and does not risk creating bubbles that disrupt the effect of the varnish.
- the thermal cooking makes it possible to polymerize the varnish R so that it becomes solid.
- a crosslinking of said varnish R is observed, namely during a subsequent heat input, the varnish R will not melt or deform.
- the polymerization of the coating R is carried out by means of ultraviolet (function shown in dashed lines in FIGURE 1 UV (R).) In the same manner, a crosslinking of said varnish R is observed. and a hardened layer is obtained on the surface S1 of the ice G.
- the binder L of the coating R undergoes a transformation phenomenon either thermal or ultraviolet and thus enters a rigid phase, solid, thermosetting and non-fuse.
- the coating R and its components of the coating R are detailed below with reference to FIG.
- the coating is 100% dry extract. It is thus in the form of powder. This means that the viscosity of the binder L is sufficiently low to avoid using a solvent So and to allow easy application of the coating on the ice G.
- the coating R is further composed of an alcoholic solvent So.
- the alcoholic solvent is water combined with alcohol. This makes it possible to solubilize the binder L.
- the OTC metal oxides modify the binder L to make it electrically conductive. They include electrical charges C.
- OTC metal oxides are transparent, with a transmission coefficient of at least 90% in the wavelengths of the visible range, so as not to alter the transparency of the ice G.
- OTC conductive transparent metal oxides are composed of the following oxides, taken alone or in combination from:
- ITO indium tin oxide
- tantalum oxide Ta2O5 tantalum oxide Ta2O5
- the binder L comprises a thermal resistivity which makes it possible to have a thermal conductivity adapted so that the thermal energy released by the coating R passes to said ice cream G.
- the binder is a binder preferably transparent, with a transmission coefficient of at least 90% in the wavelengths of the visible range, so as not to alter the transparency of the ice G.
- the binder can then be only translucent. This is not to unduly diminish the light transmission performance of the ice and alter the luminous performance of the lighting and / or signaling device.
- the transparent glass G of a lighting and / or signaling device P does not have a flat shape, but a concave shape, as illustrated in FIG. 3.
- the binder L coating R allows to distribute the said coating R on a concave shape.
- the binder L is composed of chains of monomers cm (also called molecular chains or polymer chains), as schematically illustrated. in Figure 3, which support OTC metal oxides. The electric charges C of the OTC metal oxides are thus trapped in a monomer network.
- the polymerization of the coating R described above leads to the creation of bridges between the monomers of the binder L, thus creating the monomer chains cm of the binder L.
- the creation of monomer chains cm makes it possible to obtain a thermosetting coating R by crosslinking as previously described.
- the binder L comprises an average degree of polymerization DP of between 100 and 1000 monomers. On average there is between 100 and 1000 monomers per chain. It is recalled that the degree of polymerization DP defines the length of a polymer chain. This range of between 100 and 1000 monomers makes it possible to obtain short molecular chains. It should be noted that the shorter the molecular chains, the clearer the varnish. Thus, the optical properties of the transparent ice G are not impaired.
- the polymerized binder L allows, when the current is supplied to conduct the electrical charges C (in a nonlimiting example of the electrons), transparent metal oxide conductors. OTC.
- the electrical conductivity of the coating R is thus ensured.
- the binder L is a neutral binder, namely a non-conductive binder in itself.
- the neutral binder L is:
- the binder L must comprise a sufficient density of OTC metal oxides in order to be a good conductor, at least 10%, preferably at least 20%. This results in the fact that the distance between the electric charges C must be sufficiently small to allow a transfer of charges between said OTC oxides via the binder L and thus locally provide an effect of electrical conductivity. In the opposite case, the electrical conductivity is more difficult to ensure.
- the binder L is a conductive binder based on conductive polymers.
- the binder L is composed of polyacrylonitrile or Pedot: Pss.
- the conductive binder L makes it possible to improve the electrical continuity of the varnish R.
- the varnish R will thus be less sensitive to heterogeneities of dispersion of charges, namely to heterogeneities of distances between the different OTC charges. Electrical conductivity is thus easier to ensure.
- the power source is the battery of the vehicle that powers the onboard electrical network of said vehicle.
- a lighting and / or signaling device P for a motor vehicle V comprising a housing 21 and a transparent ice G assembled to said housing 21, according to which said ice-cream G comprises a coating R electrically conductive on at least one inner face s1, said coating being based on inorganic material and composed of a binder L and OTC transparent metal oxide conductors.
- the lighting and / or signaling device is a projector P, as illustrated in FIG. 2 or FIG.
- the lighting and / or signaling device P furthermore comprises a power source (not shown) for supplying voltage to the ice-cream G and thus supplying a supply current to the R. coating
- the lighting and / or signaling device P will comprise electrical connection means for connecting the power source to the resistive coating R.
- connection means will include dedicated electrodes to connect the housing to the ice G when or after placing said ice-cream G on the housing of the lighting and / or signaling device P.
- Such electrodes may according to a first embodiment be flexible electrodes of metal, preferably copper, advantageously adhesive. According to a second embodiment, they may be transparent and made based Pedot: Pss.
- Pss a first embodiment be flexible electrodes of metal, preferably copper, advantageously adhesive.
- Pss transparent and made based Pedot: Pss.
- the coating R is applied to the outer face s2 of the transparent ice G.
- the treatment method has been described in the context of a motor vehicle.
- the treatment method can be applied to any type of vehicle, whether it is terrestrial or aerial, motorized or not.
- the described invention has the following advantages in particular: it is a simple solution to implement and inexpensive;
- the coating R degrades very little over time, especially when it is applied to the inner surface of the ice;
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1651665A FR3048326B1 (fr) | 2016-02-29 | 2016-02-29 | Procede de traitement d'une glace transparente pour un dispositif d'eclairage et/ou de signalisation pour vehicule automobile |
PCT/EP2017/054594 WO2017148913A1 (fr) | 2016-02-29 | 2017-02-28 | Procede de traitement d'une glace transparente pour un dispositif d'eclairage et/ou de signalisation pour vehicule automobile |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3424267A1 true EP3424267A1 (fr) | 2019-01-09 |
Family
ID=56117866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17707853.2A Withdrawn EP3424267A1 (fr) | 2016-02-29 | 2017-02-28 | Procede de traitement d'une glace transparente pour un dispositif d'eclairage et/ou de signalisation pour vehicule automobile |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3424267A1 (fr) |
FR (1) | FR3048326B1 (fr) |
WO (1) | WO2017148913A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4920254A (en) * | 1988-02-22 | 1990-04-24 | Sierracin Corporation | Electrically conductive window and a method for its manufacture |
DE4019703A1 (de) * | 1990-01-15 | 1991-07-25 | Renker Gmbh & Co Kg Zweigniede | Heizbare scheibe |
CN101129092A (zh) * | 2005-02-24 | 2008-02-20 | 埃克阿泰克有限责任公司 | 脉冲宽度调制的除霜器 |
DE102008034748A1 (de) * | 2008-07-24 | 2010-01-28 | Tesa Se | Flexibles beheiztes Flächenelement |
DE102014109030A1 (de) * | 2013-06-26 | 2015-01-15 | Houman Farbodfar | Leitfähige Polymer-Enteisungsfilme und Vorrichtung |
-
2016
- 2016-02-29 FR FR1651665A patent/FR3048326B1/fr active Active
-
2017
- 2017-02-28 WO PCT/EP2017/054594 patent/WO2017148913A1/fr active Application Filing
- 2017-02-28 EP EP17707853.2A patent/EP3424267A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2017148913A1 (fr) | 2017-09-08 |
FR3048326A1 (fr) | 2017-09-01 |
FR3048326B1 (fr) | 2018-04-13 |
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