FR3017331A1 - GLAZING FOR MOTOR VEHICLE COMPRISING AN OPAQUE OR TRANSPARENT ACTIVE FILM AND A PHOTOCHROMIC LAYER - Google Patents
GLAZING FOR MOTOR VEHICLE COMPRISING AN OPAQUE OR TRANSPARENT ACTIVE FILM AND A PHOTOCHROMIC LAYER Download PDFInfo
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- FR3017331A1 FR3017331A1 FR1450941A FR1450941A FR3017331A1 FR 3017331 A1 FR3017331 A1 FR 3017331A1 FR 1450941 A FR1450941 A FR 1450941A FR 1450941 A FR1450941 A FR 1450941A FR 3017331 A1 FR3017331 A1 FR 3017331A1
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- glazing
- active film
- transparent
- film
- opaque
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
- B32B17/10467—Variable transmission
- B32B17/10495—Variable transmission optoelectronic, i.e. optical valve
- B32B17/10513—Electrochromic layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
- B32B17/10467—Variable transmission
- B32B17/10486—Variable transmission photochromic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
- B32B17/10467—Variable transmission
- B32B17/10495—Variable transmission optoelectronic, i.e. optical valve
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
- B60J3/04—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles adjustable in transparency
Abstract
Vitrage de véhicule automobile comprenant deux feuilles de verre (2, 3) séparées par une couche intermédiaire de matière plastique transparente (4) et un film actif (5) pouvant être alimenté par une source d'énergie électrique pour pouvoir passer d'un état sensiblement opaque, lorsque ce film n'est pas alimenté à un état sensiblement transparent, lorsque ce film (5) est alimenté par ladite source d'énergie électrique, ce vitrage étant caractérisé en ce qu'il comporte en outre une couche passive photochromique (8) qui est apte à s'assombrir lorsque l'ensoleillement dépasse un seuil prédéterminé et provoque la diminution de l'opacité du vitrage.Motor vehicle glazing comprising two glass sheets (2, 3) separated by an intermediate layer of transparent plastic material (4) and an active film (5) which can be powered by a source of electrical energy in order to be able to pass from a state substantially opaque, when this film is not fed to a substantially transparent state, when this film (5) is powered by said source of electrical energy, this glazing being characterized in that it further comprises a passive photochromic layer ( 8) which is able to darken when the sun exceeds a predetermined threshold and causes the reduction of the opacity of the glazing.
Description
VITRAGE POUR VÉHICULE AUTOMOBILE COMPRENANT UN FILM ACTIF OPAQUE OU TRANSPARENT ET UNE COUCHE PHOTOCHROMIQUE.GLAZING FOR A MOTOR VEHICLE COMPRISING AN OPAQUE OR TRANSPARENT ACTIVE FILM AND A PHOTOCHROMIC LAYER.
La présente invention concerne un vitrage de véhicule automobile comprenant deux feuilles de verre séparées par une couche intermédiaire une ou des couches intermédiaires de matière plastique transparente. L'invention s'applique de préférence aux vitrages de toit ou de pavillon de véhicule automobile en remplacement du rideau appelé velum ou aux pare-brise en remplacement des pare-soleil. La figure 1 montre l'intérieur d'un véhicule automobile dont le toit ou le pavillon est équipé d'un vitrage 1. Les vitrages de toit ou de pavillon de véhicule automobile comportent généralement un rideau intérieur d'occultation.The present invention relates to a motor vehicle glazing comprising two glass sheets separated by an intermediate layer or intermediate layers of transparent plastic material. The invention is preferably applied to the roof glazing or roof of a motor vehicle to replace the curtain called velum or windshields to replace sunshades. Figure 1 shows the interior of a motor vehicle whose roof or roof is equipped with a glazing 1. Roof windows or roof of motor vehicle generally comprise an interior curtain curtain.
Ce rideau (non représenté sur la figure 1) est monté coulissant dans un cadre situé sous le vitrage entre une position ouverte et une position fermée d'occultation. Ce rideau est nécessaire pour protéger les occupants du véhicule en cas de fort ensoleillement.This curtain (not shown in Figure 1) is slidably mounted in a frame located under the glazing between an open position and a closed position of concealment. This curtain is necessary to protect the occupants of the vehicle in case of strong sunlight.
Ce rideau ainsi que le cadre qui le supporte augmente le coût de l'ensemble du vitrage. De plus, ce rideau, qui est monté à l'intérieur du véhicule sous le vitrage de toit, diminue la hauteur de l'espace situé au-dessus de la tête des occupants du véhicule.This curtain and the frame that supports it increases the cost of the entire glazing. In addition, this curtain, which is mounted inside the vehicle under the roof glazing, decreases the height of the space above the head of the occupants of the vehicle.
On connaît par ailleurs des vitrages de toit ou de pavillon comprenant, comme montré sur les vues en coupe des figures 2 à 5, deux feuilles de verre 2, 3 séparées par une couche 4 de matière plastique transparente, telle que du PVB (polyvinylbutyral). Dans cette couche de matière plastique transparente est noyée un film actif 5 pouvant être alimenté par une source d'énergie électrique reliée à un conducteur 6. Le film actif 5 peut ainsi passer d'un état sensiblement opaque, lorsque ce film 5 n'est pas alimenté (voir figure 2), à un état sensiblement transparent, lorsque ce film 5 est alimenté par la source d'énergie électrique, comme montré sur la figure 3. Les figures 2 et 3 illustrent le cas d'un ensoleillement modéré de moins de 850 W/m2 et d'une température également modérée de 20°C.Also known are roof or roof glazings comprising, as shown in the sectional views of Figures 2 to 5, two glass sheets 2, 3 separated by a layer 4 of transparent plastic material, such as PVB (polyvinyl butyral) . In this layer of transparent plastic material is embedded an active film 5 which can be powered by a source of electrical energy connected to a conductor 6. The active film 5 can thus pass from a substantially opaque state, when this film 5 is not powered (see Figure 2), in a substantially transparent state, when the film 5 is powered by the source of electrical energy, as shown in Figure 3. Figures 2 and 3 illustrate the case of moderate sunlight less 850 W / m2 and a moderate temperature of 20 ° C.
Dans le cas de la figure 2, la luminosité transmise au travers du vitrage, représentée par la flèche Ft est égale à environ 3% de la luminosité incidente Fi, compte tenu de l'opacité du film actif 5 et du fait que le verre des feuilles 2 et 3 soit teinté. Dans le cas de la figure 3, la luminosité transmise Ft est égale à environ 10% de la luminosité incidente Fi, compte tenu de la transparence du film actif 5. Le vitrage de toit, représenté sur les figures 2 et 3, ne présente par conséquent pas les inconvénients mentionnés plus haut, concernant l'obligation de monter un rideau d'occultation sous le vitrage pour protéger les occupants à l'égard du rayonnement solaire.In the case of FIG. 2, the brightness transmitted through the glazing, represented by the arrow Ft, is equal to approximately 3% of the incident luminosity Fi, taking into account the opacity of the active film 5 and the fact that the glass of leaves 2 and 3 are tinted. In the case of FIG. 3, the transmitted luminosity Ft is equal to about 10% of the incident luminosity Fi, taking into account the transparency of the active film 5. The roof glazing, shown in FIGS. 2 and 3, does not show therefore not the disadvantages mentioned above, concerning the obligation to mount a blackout curtain under the glazing to protect the occupants from solar radiation.
Cependant, le vitrage, représenté sur les figures 2 et 3, présente un autre inconvénient qui est illustré par la figure 4. En cas de température très élevée par exemple supérieure à 40°C et d'ensoleillement très important (supérieur à 850 W/m2), le film actif 5 au lieu d'être opaque lorsqu'il n'est pas alimenté par la source électrique subit une perte d'opacité, à tel point que la luminosité transmise Ft devient supérieure à 3% de la luminosité incidente Fi, lorsque le film actif 5 n'est pas alimenté, ce qui n'est pas acceptable pour les occupants du véhicule. Le but de la présente invention est de remédier aux inconvénients du vitrage ci-dessus.However, the glazing, shown in Figures 2 and 3, has another disadvantage which is illustrated in Figure 4. In case of very high temperature for example greater than 40 ° C and sunshine very important (greater than 850 W / m2), the active film 5 instead of being opaque when not powered by the power source suffers a loss of opacity, so much so that the transmitted brightness Ft becomes greater than 3% of the incident light Fi when the active film 5 is not powered, which is not acceptable for the occupants of the vehicle. The object of the present invention is to overcome the disadvantages of the glazing above.
Ce but est atteint, selon l'invention, grâce à un vitrage de véhicule automobile comprenant deux feuilles de verre séparées par une couche intermédiaire de matière plastique transparente et un film actif pouvant être alimenté par une source d'énergie électrique pour pouvoir passer d'un état sensiblement opaque lorsque ce film n'est pas alimenté à un état sensiblement transparent, lorsque ce film est alimenté par ladite source d'énergie électrique, ce vitrage étant caractérisé en ce qu'il comporte en outre une couche passive photochromique qui est apte à s'assombrir lorsque l'ensoleillement dépasse un seuil prédéterminé et provoque la diminution de l'opacité du vitrage.This object is achieved, according to the invention, thanks to a motor vehicle glazing comprising two sheets of glass separated by an intermediate layer of transparent plastic material and an active film that can be powered by a source of electrical energy to be able to pass from a substantially opaque state when this film is not supplied to a substantially transparent state, when this film is powered by said source of electrical energy, this glazing being characterized in that it further comprises a passive photochromic layer which is suitable to darken when the sun exceeds a predetermined threshold and causes the reduction of the opacity of the glazing.
La couche passive photochromique intégrée dans le vitrage selon l'invention compense ainsi la diminution de l'opacité du film actif lorsque celui-ci n'est pas alimenté électriquement et que l'ensoleillement est très puissant par exemple supérieur à 850 W/m2.The photochromic passive layer integrated in the glazing according to the invention thus compensates for the reduction of the opacity of the active film when it is not electrically powered and the sunlight is very powerful, for example greater than 850 W / m2.
Dans l'application préférée de l'invention, le vitrage est constitué par un vitrage de toit ou de pavillon de véhicule automobile. Dans cette application, le vitrage selon l'invention protège efficacement et assure un bien être aux occupants du véhicule, même en cas de forte chaleur et de fort ensoleillement et ce, sans qu'il soit nécessaire d'équiper le vitrage d'un rideau d'occultation encombrant et onéreux. De préférence, ledit film actif opaque ou transparent est noyé dans la couche de matière plastique transparente. Cependant, ledit film actif opaque ou transparent peut également être situé à l'interface entre l'une des feuilles de verre et la couche de matière plastique.In the preferred application of the invention, the glazing is constituted by a glazing roof or roof of a motor vehicle. In this application, the glazing according to the invention effectively protects and ensures a well being to the occupants of the vehicle, even in case of high heat and strong sunshine and without the need to equip the glazing with a curtain occultation bulky and expensive. Preferably, said opaque or transparent active film is embedded in the transparent plastic layer. However, said opaque or transparent active film may also be located at the interface between one of the glass sheets and the plastic layer.
Ce film actif peut être composé de cristaux liquides comprenant des molécules dont les dipôles électriques peuvent être orientés grâce au champ électrique créé par le courant électrique fourni par ladite source. Dans un mode de réalisation avantageux de l'invention, la couche passive photochromique est déposée sur la face de l'une des feuilles de verre adjacente à la couche intermédiaire de matière plastique. Cependant, la couche photochromique peut être déposée sur la face de la feuille de verre destinée à être dirigée vers l'intérieur du véhicule. Dans un autre mode de réalisation, la couche passive photochromique est constituée de pigments de composés photochromiques noyés dans la couche intermédiaire de matière plastique ou dans le film actif opaque ou transparent. Selon un autre aspect, l'invention concerne également un véhicule automobile équipé d'un vitrage selon l'invention. Ce vitrage présente en particulier l'avantage d'être dépourvu de rideau d'occultation, en raison de l'opacité qui est apportée par la couche photochromique en cas de fort ensoleillement. D'autres particularités et avantages de l'invention apparaîtront encore tout au long de la description ci-après. Aux dessins annexés, donnés à titre d'exemples, non limitatifs : - la figure 5 est une vue en coupe transversale partielle d'un vitrage selon l'invention dans lequel le film actif n'est pas alimenté électriquement et est opaque, la couche photochromique étant transparente, - la figure 6 est une vue analogue à la figure 5 montrant le film actif alimenté électriquement et transparent, la couche photochromique étant transparente, - la figure 7 est une vue analogue aux figures 5 à 6, montrant le film actif non alimenté ayant perdu son opacité et la couche photochromique devenue opaque du fait d'un fort ensoleillement, - la figure 8 est un diagramme montrant l'évolution de la transmission lumineuse à travers le vitrage selon l'invention, en fonction de la puissance par m2 de l'ensoleillement pour différents états d'alimentation du film actif. Les figures 5 à 7 représentent un vitrage de toit ou de pavillon d'un véhicule automobile comprenant, comme dans le cas des figures 2 à 4, deux feuilles de verre 2, 3 teintées, séparées par une ou plusieurs couches de matière plastique transparente 4 par exemple en PVB. Si besoin, ces feuilles de PVB peuvent avoir des propriétés anti-infrarouge ou anti-ultraviolets. La feuille de verre 3 adjacente à l'habitacle du véhicule peut comporter à sa 20 périphérie une sérigraphie opaque 7, comme dans le cas des figures 2 à 4. Le vitrage comporte en outre un film actif 5, qui dans l'exemple représenté, est noyé dans la couche intermédiaire en matière plastique 4. Ce film actif 5 peut être alimenté électriquement pas une source, telle que la batterie du véhicule, pour pouvoir passer d'un état sensiblement opaque, comme 25 montré par la figure 5, lorsque le film 5 n'est pas alimenté, à un état sensiblement transparent, lorsque le film est alimenté par la source d'énergie électrique, comme indiqué sur la figure 6. Le vitrage de toit, représenté sur les figures 5 à 7, comprend, conformément à l'invention, une couche passive photochromique 8 qui peut s'assombrir, lorsque 30 l'ensoleillement dépasse un certain seuil, comme montré sur la figure 7. Lorsque la puissance par m2 de l'ensoleillement dépasse 850 W/m2, le film actif 5 perd partiellement son opacité (voir figure 7), comme dans le cas du vitrage connu.This active film may be composed of liquid crystals comprising molecules whose electric dipoles can be oriented by virtue of the electric field created by the electric current supplied by said source. In an advantageous embodiment of the invention, the passive photochromic layer is deposited on the face of one of the glass sheets adjacent to the intermediate layer of plastics material. However, the photochromic layer may be deposited on the face of the glass sheet intended to be directed towards the inside of the vehicle. In another embodiment, the photochromic passive layer consists of photochromic compound pigments embedded in the plastic interlayer or in the opaque or transparent active film. According to another aspect, the invention also relates to a motor vehicle equipped with a glazing unit according to the invention. This glazing has in particular the advantage of being devoid of blackout curtain, because of the opacity that is provided by the photochromic layer in case of strong sunlight. Other features and advantages of the invention will become apparent throughout the description below. In the accompanying drawings, given by way of nonlimiting example: FIG. 5 is a partial cross-sectional view of a glazing unit according to the invention in which the active film is not electrically powered and is opaque; photochromic being transparent, - Figure 6 is a view similar to Figure 5 showing the active film electrically powered and transparent, the photochromic layer being transparent, - Figure 7 is a view similar to Figures 5 to 6, showing the active film not having lost its opacity and the photochromic layer become opaque due to strong sunlight, - Figure 8 is a diagram showing the evolution of the light transmission through the glazing according to the invention, as a function of the power per m2 sunshine for different power states of the active film. Figures 5 to 7 show a roof glazing or roof of a motor vehicle comprising, as in the case of Figures 2 to 4, two sheets of glass 2, 3 tinted, separated by one or more layers of transparent plastic material 4 for example in PVB. If necessary, these PVB sheets may have anti-infrared or anti-ultraviolet properties. The glass sheet 3 adjacent to the passenger compartment of the vehicle may comprise at its periphery an opaque serigraphy 7, as in the case of FIGS. 2 to 4. The glazing further comprises an active film 5, which in the example shown, it is embedded in the plastic intermediate layer 4. This active film 5 may be electrically powered by a source, such as the vehicle battery, in order to be able to pass from a substantially opaque state, as shown in FIG. film 5 is not supplied, in a substantially transparent state, when the film is supplied by the source of electrical energy, as shown in FIG. 6. The roof glazing, shown in FIGS. 5 to 7, comprises, in accordance with FIG. to the invention, a passive photochromic layer 8 which can darken, when the sunlight exceeds a certain threshold, as shown in FIG. 7. When the power per m2 of the irradiation exceeds 850 W / m2, the film active 5 pe rd partially opacity (see Figure 7), as in the case of known glazing.
Toutefois, cette perte d'opacité du film 5 est compensée par l'assombrissement de la couche photochromique 8 qui a été ajoutée au vitrage selon l'invention. Le film actif 5 opaque ou transparent peut être noyé dans la couche en matière plastique 4, comme montré sur les figures 5 à 7, ou peut être situé à l'interface entre l'une des feuilles de verre 2 ou 3 et la couche de matière plastique. Le film actif 5 peut être composé de cristaux liquides constitués de molécules dont les dipôles électriques peuvent être orientés dans la même direction grâce à un champ électrique créé par le courant électrique qui alimente le film 5. Lorsque les dipôles sont orientés par le champ électrique, le film 5 est transparent, tandis que lorsque ces dipôles ne sont pas orientés, le film 5 est opaque. La couche passive photochromique 8 est déposée de préférence sur la face de l'une des deux feuilles de verre 2, 3 adjacente à la couche intermédiaire de matière plastique 4, ou sur la face intérieure du verre intérieur, ou encore sur une feuille de PVB ou sur le film actif, ou dans une feuille de PVB ou dans le film actif. Dans l'exemple montré sur les figures 5 à 7, la couche photochromique 8 est déposée sur la face intérieure de la feuille de verre 3 dirigée vers l'habitacle du 20 véhicule. Cette couche passive photochromique 8 peut également être constituée de pigments de composés photochromiques noyés dans la matière plastique de la couche intermédiaire 4 ou dans le film actif 5 opaque ou transparent. On va maintenant expliquer en détail le fonctionnement du vitrage de toit que 25 l'on vient de décrire. Dans le cas de la figure 5, les conditions atmosphériques sont les suivantes : - l'ensoleillement est modéré (inférieur à 850 W/m2) ; - la température est modérée (20°C). Le film actif 5 n'est pas alimenté, comme montré sur la figure 5, il est par 30 conséquent opaque. La couche photochromique 8 est transparente. La luminosité transmise Ft à travers le vitrage est égale seulement à 3% de la luminosité incidente F.However, this loss of opacity of the film 5 is compensated by the darkening of the photochromic layer 8 which has been added to the glazing according to the invention. The opaque or transparent active film 5 may be embedded in the plastic layer 4, as shown in FIGS. 5 to 7, or may be located at the interface between one of the glass sheets 2 or 3 and the plastic material. The active film 5 may be composed of liquid crystals consisting of molecules whose electric dipoles can be oriented in the same direction by virtue of an electric field created by the electric current which supplies the film 5. When the dipoles are oriented by the electric field, the film 5 is transparent, whereas when these dipoles are not oriented, the film 5 is opaque. The passive photochromic layer 8 is preferably deposited on the face of one of the two glass sheets 2, 3 adjacent to the intermediate layer of plastic material 4, or on the inner face of the inner glass, or on a sheet of PVB or on the active film, or in a PVB sheet or in the active film. In the example shown in FIGS. 5 to 7, the photochromic layer 8 is deposited on the inside face of the glass sheet 3 directed towards the passenger compartment of the vehicle. This passive photochromic layer 8 may also consist of pigments of photochromic compounds embedded in the plastic of the intermediate layer 4 or in the active film 5 opaque or transparent. We will now explain in detail the operation of the roof glazing that has just been described. In the case of Figure 5, the atmospheric conditions are as follows: - the sun is moderate (less than 850 W / m2); - the temperature is moderate (20 ° C). The active film 5 is not powered, as shown in FIG. 5, it is therefore opaque. The photochromic layer 8 is transparent. The brightness transmitted Ft through the glazing is equal to only 3% of the incident light F.
Dans le cas de la figure 6, les conditions atmosphériques sont les mêmes que dans le cas de la figure 5, à savoir : - l'ensoleillement est modéré (inférieur à 850 W/m2) ; - la température est modérée (20°C).In the case of Figure 6, the atmospheric conditions are the same as in the case of Figure 5, namely: - the sun is moderate (less than 850 W / m2); - the temperature is moderate (20 ° C).
Le film actif 5 est alimenté et devient transparent. La couche photochromique est également transparente. La luminosité transmise Ft est égale à 10% de la luminosité incidente F. Dans le cas de la figure 7, les conditions atmosphériques sont les suivantes : - l'ensoleillement est fort (supérieur à 850 W/m2) ; - la température est élevée (plus de 40°C). Le film actif 5 n'est pas alimenté électriquement. Cependant, au lieu d'être opaque, ce film 5 subit une perte d'opacité et laisse passer de la luminosité. Toutefois, la couche photochromique 8 s'opacifie en raison du fort ensoleillement du vitrage et compense ainsi la perte d'opacité du film actif 5. De ce fait, la luminosité transmise Ft est égale à 3%, comme dans le cas de la figure 5, ce qui permet d'assurer un excellent confort aux occupants du véhicule. Le diagramme de la figure 8 représente différentes courbes montrant l'évolution de la transmission lumineuse Ft à travers le vitrage selon l'invention en fonction de l'ensoleillement E. La courbe C1 montre que lorsque le film actif 5 n'est pas alimenté, la transmission lumineuse Ft reste à 3% jusqu'à un seuil d'ensoleillement E égal à 850 W/m2.The active film 5 is fed and becomes transparent. The photochromic layer is also transparent. The transmitted brightness Ft is equal to 10% of the incident light F. In the case of FIG. 7, the atmospheric conditions are as follows: the sunshine is high (greater than 850 W / m2); - the temperature is high (over 40 ° C). Active film 5 is not electrically powered. However, instead of being opaque, this film 5 undergoes a loss of opacity and passes light. However, the photochromic layer 8 becomes opaque due to the strong sunlight of the glazing and thus compensates for the loss of opacity of the active film 5. As a result, the transmitted brightness Ft is equal to 3%, as in the case of FIG. 5, which ensures excellent comfort to the occupants of the vehicle. The diagram of FIG. 8 represents various curves showing the evolution of the light transmission Ft through the glazing according to the invention as a function of the sun exposure E. The curve C1 shows that when the active film 5 is not powered, the light transmission Ft remains at 3% up to a sunshine threshold E equal to 850 W / m2.
Au-delà de ce seuil, la luminosité transmise Ft augmente lorsque la couche photochromique 8 est absente. Lorsque cette couche 8 est présente, la courbe C2 montre que la luminosité transmise reste égale à 3% même au-delà du seuil de 850 K/m2. La courbe en pointillé C3 montre la contribution de la couche photochromique 8. La courbe C4 montre que lorsque le film actif 5 est alimenté et que la couche photochromique 8 est absente, la transmission lumineuse Ft reste égale à 10% au-delà du seuil d'ensoleillement égal à 850 W/m2.Beyond this threshold, the transmitted brightness Ft increases when the photochromic layer 8 is absent. When this layer 8 is present, the curve C2 shows that the transmitted brightness remains equal to 3% even beyond the threshold of 850 K / m2. The dotted curve C3 shows the contribution of the photochromic layer 8. The curve C4 shows that when the active film 5 is fed and the photochromic layer 8 is absent, the light transmission Ft remains equal to 10% above the threshold d sunshine equal to 850 W / m2.
Lorsque la couche photochromique 8 est présente, la courbe C5 montre que le vitrage selon l'invention subit une légère perte d'opacité, lorsque l'ensoleillement est supérieur à 850 W/m2. Cependant, la quantité de lumière reçue est perçue comme identique par les occupants du véhicule. Ainsi, la combinaison du film actif 5 et de la couche photochromique 8 assure que l'opacité du vitrage selon l'invention ne soit plus variable en fonction de la puissance de l'ensoleillement.When the photochromic layer 8 is present, the curve C5 shows that the glazing according to the invention undergoes a slight loss of opacity, when the irradiation is greater than 850 W / m2. However, the amount of light received is perceived as identical by the occupants of the vehicle. Thus, the combination of the active film 5 and the photochromic layer 8 ensures that the opacity of the glazing according to the invention is no longer variable as a function of the power of the sun.
Claims (10)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1450941A FR3017331A1 (en) | 2014-02-07 | 2014-02-07 | GLAZING FOR MOTOR VEHICLE COMPRISING AN OPAQUE OR TRANSPARENT ACTIVE FILM AND A PHOTOCHROMIC LAYER |
| PCT/FR2015/050152 WO2015118242A1 (en) | 2014-02-07 | 2015-01-22 | Glazing for motor vehicle, comprising an opaque or transparent active film and a photochromic layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1450941A FR3017331A1 (en) | 2014-02-07 | 2014-02-07 | GLAZING FOR MOTOR VEHICLE COMPRISING AN OPAQUE OR TRANSPARENT ACTIVE FILM AND A PHOTOCHROMIC LAYER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR3017331A1 true FR3017331A1 (en) | 2015-08-14 |
Family
ID=50780676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR1450941A Withdrawn FR3017331A1 (en) | 2014-02-07 | 2014-02-07 | GLAZING FOR MOTOR VEHICLE COMPRISING AN OPAQUE OR TRANSPARENT ACTIVE FILM AND A PHOTOCHROMIC LAYER |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR3017331A1 (en) |
| WO (1) | WO2015118242A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2857239A1 (en) * | 2013-10-03 | 2015-04-08 | Volvo Car Corporation | Digital sunshade for automotive glass |
| DE112018001647T5 (en) * | 2017-03-30 | 2019-12-24 | Agp America S.A. | OPAQUE LAMINATED VEHICLE ROOF WITH PANORAMIC GLAZED APPEARANCE |
| WO2020212094A1 (en) * | 2019-04-16 | 2020-10-22 | Saint-Gobain Glass France | Glazing unit and vehicle having same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266177B1 (en) * | 1999-11-18 | 2001-07-24 | Donnelly Corporation | Electrochromic devices |
| US20040075302A1 (en) * | 2001-03-13 | 2004-04-22 | Young-Ill Chon | Transparent roof structure in vehicle |
| US20120320012A1 (en) * | 2011-06-20 | 2012-12-20 | Sony Corporation | Display device and electronic apparatus |
| CN202806311U (en) * | 2012-08-24 | 2013-03-20 | 长春光景科技有限公司 | Automobile front windscreen with function of sun shield |
-
2014
- 2014-02-07 FR FR1450941A patent/FR3017331A1/en not_active Withdrawn
-
2015
- 2015-01-22 WO PCT/FR2015/050152 patent/WO2015118242A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6266177B1 (en) * | 1999-11-18 | 2001-07-24 | Donnelly Corporation | Electrochromic devices |
| US20040075302A1 (en) * | 2001-03-13 | 2004-04-22 | Young-Ill Chon | Transparent roof structure in vehicle |
| US20120320012A1 (en) * | 2011-06-20 | 2012-12-20 | Sony Corporation | Display device and electronic apparatus |
| CN202806311U (en) * | 2012-08-24 | 2013-03-20 | 长春光景科技有限公司 | Automobile front windscreen with function of sun shield |
| EP2700502A1 (en) * | 2012-08-24 | 2014-02-26 | Changchun Sun Windows Technology Co. Ltd | Front windshield glass of automobile with sunshine-shielding plate function |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015118242A1 (en) | 2015-08-13 |
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