EP3424268A1 - 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
- EP3424268A1 EP3424268A1 EP17707854.0A EP17707854A EP3424268A1 EP 3424268 A1 EP3424268 A1 EP 3424268A1 EP 17707854 A EP17707854 A EP 17707854A EP 3424268 A1 EP3424268 A1 EP 3424268A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- ice
- lighting
- transparent
- electrically conductive
- 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- Withdrawn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 treating 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 method of treating a transparent ice for a lighting and / or signaling device for a motor vehicle to perform a de-icing function and / or an anti-condensation function on said ice, according to which the treatment method comprises:
- the coating by applying an electrical voltage to the coating, the latter will emit thermal energy that will heat the transparent ice and thus prevent air from condensing and also defrost said ice.
- 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. depositing said coating on the ice is by watering or spraying;
- the organic material is composed of transparent electrically conductive polymers
- said transparent electrically conductive polymers are:
- the deposition of the coating on the ice is carried out so as to obtain a coating thickness e of between 0.3 ⁇ and ⁇ ⁇ ⁇ .
- a lighting and / or signaling device for a motor vehicle comprising a housing and a transparent glass assembly said housing, wherein said ice comprises an electrically conductive coating on at least one inner face of said ice, said coating being based on electrically conductive organic material.
- the lighting and / or signaling device for a motor vehicle may also include one or more additional characteristics taken alone or in combination from the following:
- the organic material is composed of transparent electrically conductive polymers
- the transparent electrically conductive polymers are: phenylene polysulfide (PPS); or Pedot-Pss.
- 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.
- 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 defrosting function Ft1 and / or anti-condensation Ft2 (or demisting) 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.
- condensation or fog is mainly formed on the inner face s1 of the transparent ice 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 emit less thermal energy than conventional light sources such as filament halogen lamps and therefore do not heat the inner side of the ice G. Also, with the use of said LEDs, there is more risk of condensation on the inner face s1 of said transparent glass G. This condensation phenomenon is all the more troublesome that it is visible by an observer because the ice-cream 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:
- the light sources of the taillights are significantly less powerful than those of the headlamps. There is therefore less thermal difference between the outside and inside of the transparent ice G.
- a projector P is illustrated in FIG. 2.
- 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 de-icing or defogging function and the special versions of these projectors with these functions, while having an ice-cream on which the coating R has been applied, as well as arrangements of the housing allowing 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:
- a coating R on at least one inner face s1 of said ice-cream G (illustrated function APP (R, s1, G)), said coating R being based on electrically conductive organic material;
- 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 glass G. This makes it possible to perform the functions of defrost Ft1 and anti-condensation Ft2 sought. 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 face 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 a watering (called in English "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 inner side s1 by the watering machine.
- These hard-to-access areas are so-called off-area areas or masked areas that correspond to areas of the ice-cream G not illuminated by the light sources of the projector P when they are lit. 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 which is sprayed with a pistol on the inside face s1 of the ice-cream.
- 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 side s1 are covered with the coating R.
- the deposition of the coating R on the ice-cream G is performed so as to obtain a coating thickness R included, inclusive, between 0.3 ⁇ and 10 ⁇ (after drying), preferably between 0, 5 and 1 ⁇ , limits 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 evapo- ration.
- the MTH treatment method comprises the deposition of one or more R coating layers on the transparent ice G.
- a small thickness e between 0.3 ⁇ ⁇ ⁇ ⁇ .
- 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 R coating on 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 method of treatment MTH further comprises the application of a surfactant S on said ice-cream G prior to the deposition of said coating R ( function shown in dashed lines in Figure 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 drying and / or the polymerization of the coating R makes it possible to modify the organic material of the coating R so that this organic material undergoes a transformation phenomenon (here thermal) and thus enters a rigid, solid, thermosetting and non-fusible phase.
- a transformation phenomenon here thermal
- the drying and / or the polymerization of the coating R causes an increase in the viscosity of the coating R and thus a solidification of said coating R.
- drying and / or polymerization R coating is carried out by thermal baking (function shown in dashed lines in Figure 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 coating R is detailed below with reference to FIG.
- the coating R further comprises an alcoholic solvent So.
- the alcoholic solvent is water combined with alcohol. This makes it possible to solubilize the organic matter.
- the organic material is composed of transparent electrically conductive polymers Po as shown in FIG. 3 which is an enlargement of a portion of the mirror G of the lighting and / or signaling device P.
- the conductivity of the transparent electrically conductive polymers Po is at least 10 3 Sm -1 (Siemens per meter), for example between 10 3 and 10 6 Sm -1 .
- the transparent electrically conductive polymers Po are:
- Pss is a mixture of two polymers which are:
- PEDOT poly (3,4-ethylenedioxythiophene)
- PSS poly (styrene sulfonate)
- the electrical conductivity is the ability to let the electric charges move freely, namely to allow the passage of electric current.
- the electrical conductivity thus depends on the density of the charge carriers in the organic material.
- the charge carriers are the electrons (negative charge carrier) but also the electron holes (positive charge carriers).
- the conductivity of the polymers is explained according to the molecular orbital theory.
- the electrons of a molecular structure are treated as moving under the influence of the nuclei of the molecule as a whole. Electrons are not assigned to chemical bonds between atoms as in the case of atomic orbitals.
- Each molecule is thus endowed with a set of molecular orbitals (also called hybrid atomic orbitals), a molecular orbital being a linear combination of atomic orbitals belonging to the same electronic layer.
- boundary orbitals are:
- the HOMO Highest Occupied Molecular Orbital
- This orbital is also called valence band
- - the LUMO Large Unoccupied Molecular Orbital
- This orbital is also called conduction band.
- the HOMO orbital comprises mobile electrons shared by the atoms of the molecule. They are called ⁇ electrons.
- the electrical conductivity of the polymers results in particular from doping by the addition of a chemical reagent which oxidizes or reduces the polymer. Doping passes electrons from the HOMO orbital to the LUMO orbital, making the polymer electrically conductive.
- the doping is chemical. It exposes the polymer to an oxidant (in a non-limiting example of iodine, bromine, halogens) or to a reducing agent (in a non-limiting example of the alkali metals). Oxidation doping is also called P-type doping, and reduction doping is called N-type doping. Thus, positive or negative charges are introduced on the polymer.
- the doping is electrochemical.
- Two electrodes are immersed in a solution. One of them is covered with the polymer that we want to dope. By applying a voltage between the electrodes, this causes a movement of the ions of the solution and the electrons which:
- 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 an electrically conductive coating R on at least one inner face s1, said coating being based on electrically conductive organic material.
- 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 comprise in particular dedicated electrodes for connecting the housing to the glass G during or after the placing of said glass G on the housing of the lighting and / or signaling device P.
- Such electrodes may according to a first embodiment be electrodes flexible metal, preferably copper, preferably adhesive. According to a second embodiment, they may be 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 coating R degrades very little over time, especially when it is applied to the inner surface of the ice;
Landscapes
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Surface Treatment Of Glass (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1651668A FR3048327B1 (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/EP2017/054595 WO2017148914A1 (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 |
---|---|
EP3424268A1 true EP3424268A1 (fr) | 2019-01-09 |
Family
ID=56117867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17707854.0A Withdrawn EP3424268A1 (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) | EP3424268A1 (fr) |
FR (1) | FR3048327B1 (fr) |
WO (1) | WO2017148914A1 (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 FR1651668A patent/FR3048327B1/fr active Active
-
2017
- 2017-02-28 EP EP17707854.0A patent/EP3424268A1/fr not_active Withdrawn
- 2017-02-28 WO PCT/EP2017/054595 patent/WO2017148914A1/fr active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2017148914A1 (fr) | 2017-09-08 |
FR3048327A1 (fr) | 2017-09-01 |
FR3048327B1 (fr) | 2020-10-02 |
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