Illuminable automotive laminated glazing element, and vehicle with such an illuminable laminated glazing element

Abstract

The subject of the invention is an illuminable automotive laminated glazing element (100) comprising a first transparent sheet (1) made of glass, a second transparent sheet (2) of refractive index n1 in the visible with a third main face F3, a polymer lamination interlayer (3) comprising an upper intermediate layer (31), and light-extracting means between the upper intermediate layer (31) and the face F3, the light-extracting means comprising a thermoplastic polymer film (5'), called the extractor film, having a haze H1 of at least 0.5%, the polymer film having a refractive index n0 in the visible greater than n1, and forming one or more extraction zones, which are called fine extraction zones, that have a width of at most 2 cm or even 1 cm and that are at least millimetric in size.

Description

Description Title of the invention: ILLUMINABLE LAMINATED GLASS ELEMENT FOR VEHICLES, VEHICLE WITH SUCH AN ILLUMINABLE LAMINATED GLASS ELEMENT

[0001] The present invention relates to an illuminable laminated glazing for vehicles, in particular road vehicle glazing.

[0002] It is known to have multifunctional road vehicle roofs that can be illuminated by lighting, for example, light-emitting diodes.

[0003] Regarding vehicle roof lighting, light-emitting diodes have been used for the glazed roofs of road vehicles, including panoramic laminated roofs with LED lighting as described in document WO2010049638. The light emitted by the diodes is introduced edge-on into the inner glazing forming a guide, the light being extracted from the glazing by a diffusing layer on the glazing.

[0004] To improve light extraction, document WO2015118279 proposes a luminous laminated vehicle roof incorporating within the thermoplastic laminate interlayer a fluoropolymer film with a thickness of at least 600nm, with a refractive index n2 at 550nm, the inner glass being a guide layer with a refractive index n1, n1-n2 being at least 0.08, the fluoropolymer film then forming an optical insulator between the inner glass and the outer glass.

[0005] The present invention sought to develop a laminated vehicle glazing, alternative and even opening up the range of applications.

[0006] To this end, the present invention relates to an illuminable laminated glass element for a vehicle, particularly a road vehicle (fixed or opening, such as a roof, side window, especially rear window, rear window, windshield, particularly for cars but also trucks, public transport such as buses, coaches, etc.) or a railway vehicle (trains, metros, trams), comprising: a laminated glass, preferably curved, transparent (at least in a clear (central) window area) comprising: a first sheet (which may be curved), transparent, made of mineral glass (clear or tinted, particularly grey or green), intended to form the outer glass, with a first main face called face F1 (intended to be oriented towards the outside of the vehicle), a second main face called face F2 (optionally coated with a transparent functional coating (in the clear window area)) and a first slice, (in particular a transparent functional coating with a thickness of at most 1 µm or 200 nm,for a road vehicle and even a car, preferably with a thickness of no more than 4mm, or even no more than 2.5mm, even no more than 2.2mm - in particular 1.9mm, 1.8mm, 1.6mm and 1.4mm - and even with a thickness of at least 0.7mm, for example with a refractive index nv of at least 1.5 in the visible spectrum), a second transparent sheet (which can be curved), made of mineral or polymer glass, with a refractive index n1 in the visible spectrum, with a third main face F3 (oriented towards the outside of the vehicle) and a fourth main face F4 opposite (fourth face F4 towards the passenger compartment) and a second slice, (preferably a fourth face bare or even coated with a coating, functional (transparent), in particular a functional coating of thickness of not more than 1 m or 200 nm), in particular the second sheet being of thickness of at least 0.7 mm (to promote light guidance), possibly less than that of the first sheet of glass, even by not more than 2.2 mm - in particular 1.9 mm, 1.8 mm, 1.6 mm and 1.4 mm - or even by not more than 1.3 mm or by not more than 1 mm, the total thickness of the first and second sheets preferably being strictly less than 5 or 4 mm, even 3.7 mm), between the first and second sheets, a polymer laminate interlayer (transparent (at least in the clear glass)), (multilayer), comprising an upper (adhesive) interlayer on face F2 in adhesive contact with the second face F2 or with a functional transparent coating on face F2 (in the clear glass in particular a functional transparent coating of thickness of not more than 1 m or 200 nm) and a lower (adhesive) interlayer on the F3 face side,between the upper interlayer and the face F3 (in particular between the upper interlayer and the lower interlayer), light extraction means, light guided in a guide layer comprising at least the second sheet, characterized in that the light extraction means comprise a thermoplastic polymer film with a front principal face Fa oriented towards the face F2 and an opposite rear principal face Fb, distinct from a fluoropolymer, called the extraction film, having a blur H1 of at least 0.5% and in particular of at most 10% or 5% or 2% or 1%, preferably of a thickness of at least 50 µm and better of at most 300 µm or 200 µm (which avoids the use of an interlayer frame layer for lamination), the polymer film having a refractive index n0 in the visible range greater than or equal to n1, preferably greater than n1 (for example n0 at least 1.53), and forming one or more extraction zones, called thin,with a width of at most 2cm, or even at most 1cm, and at least a millimeter (specifically at least 2mm or 5mm).

[0007] It is recalled that the level of diffusion of a substrate can be characterized by the value of the blur (or blur factor), measured in a known way by a blur measurement device (Haze in English), also called a "Haze meter".

[0008] Surprisingly, the inventors showed that the blurring of the extraction film makes it possible to provide a soft and homogeneous lighting effect by limiting the width of the extraction areas.

[0009] According to one characteristic, the H1 blur is at most 5% and even at least 0.7%.

[0010] The light transmission of the extraction film can be at least 80% or 85%.

[0011] The extraction film can be a polycrystalline film (to generate blur and diffusion).

[0012] The extraction film can be a thermoplastic polymer or even a cross-linked polymer, in particular: - polyester, such as polyethylene terephthalate (PET), poly(butylene terephthalate) (PBT), poly(ethylene naphthalate) (PEN), - polyimide, polyamide.

[0013] Preferably, the extraction film is a polyester film, or even PET. PET is particularly clear. Preferably, the PET extraction film has a light transmission (LT) of at least 80%.

[0014] According to one characteristic, the extractor film has on the rear face Fb a transparent high index coating with a refractive index n4 greater than n0, in particular n4-n0 of at least 0.1 or 0.2 or 0.3 or 0.4, and preferably with a thickness of at most 50pm and even at most 20pm.

[0015] In particular, the high-index coating is transparent, untinted, and organic. It is deposited either by liquid means, such as inkjet printing, or by mineral means (using oxides such as Ti, Zr, etc.) such as physical vapor deposition (PVD) or sol-gel deposition. For example, a transparent high-index coating with a refractive index n4' is 1.56 or 1.85.

[0016] According to one characteristic, the extractor film (the rear face Fb) is in adhesive contact with the face F3 of the glazing via an adhesive which is a transparent high index coating with a refractive index n'4 greater than n0, in particular n'4-n0 of at least 0.1 or 0.2 or 0.3 or 0.4, preferably with a thickness of at most 50pm and even 20pm.

[0017] According to a characteristic and configuration of the extraction means, the extraction film (having a surface area S) extends into a viewing area, and preferably beyond the viewing area under a peripheral masking layer, and has one or more through-holes in its thickness, preferably closed. Preferably, the extraction film also includes a peripheral frame (non-functional with respect to extraction) adjacent to the local diffusing areas (for gripping, mechanical reinforcement). The frame has at least two opposite edges without any laterally openings.

[0018] Preferably, the peripheral frame of the extraction film (to facilitate gripping and handling of the film) has a width between 10 mm and 20 mm.

[0019] Depending on one characteristic and another configuration of the extraction means, - the extraction film is extended (presenting a surface S), extending into a viewable area and preferably beyond the viewable area under a peripheral masking layer, arranged on face F2 (for example, black enamel), notably in the shape of a frame - the extractor film carries an optical insulating coating, made of a material comprising a matrix preferably distinct from a fluoropolymer, on the rear face Fb, and an edge, with a refractive index n2 in the visible, optical insulating coating of submillimeter thickness Ei and of at least 400nm, - The extraction film is between the upper interlayer and a lower interlayer with a refractive index of n3 in the visible spectrum, in adhesive contact with the third face F3 or with a functional transparent coating on face F3, - n2 is less than n1, the difference in refractive indices n1-n2 being at least 0.06 in the visible spectrum, and - the optical insulating coating, includes one or more cutouts leaving the said extraction zones of the extraction film exposed.

[0020] In particular, in this alternative configuration, a high-index transparent coating with a refractive index n4 greater than n0, specifically n4-n0, of at least 0.1, 0.2, 0.3, or 0.4, and a thickness of at most 50 µm, or even 20 µm, is applied to the back face Fb, directly above the area(s) of the masking, or to the lower interlayer. Specifically, the difference in refractive indices n1-n2 is at least 0.08 in the visible spectrum, and the thickness Ei is at least 500 nm, or even at least 800 nm.

[0021] In these local savings zones the lower intercalated layer may be present (fills the savings by creep).

[0022] According to one characteristic and according to said other configuration, the optical insulating coating comprises a crosslinked polymer matrix with said index n2, preferably of no more than 1.42, matrix preferably among polyacrylate-based polymers with a fluorinated function, in particular urethane acrylate or fluorourethane acrylate or fluorosilicone acrylate and / or in that the optical insulating coating comprises a matrix with a refractive index n2 m greater than n2 and less than n1, and preferably with n2 mof at most 1.48 and n2 preferably of at most 1.42, and comprises (nano)porosity and / or (nano)particles of low index, of refractive index less than n1, in particular hollow, preferably with a size of at most 300nm. In particular the matrix is ​​organic, in particular cross-linked polymer or thermoplastic, in particular selected from polymer based on polyacrylate, polyepoxide, polyvinyl acetate, polyester, polyurethane, PVB, or the matrix is ​​mineral in particular silica.

[0023] According to one characteristic, the vehicle's illuminateable laminated glass element includes a light source (preferably an array of light-emitting diodes), in optical coupling with the second sheet of glass.

[0024] According to one characteristic, the illuminateable laminated glass element of the vehicle comprises, on the fourth face F4 side, a light source, preferably an array of light-emitting diodes, and a reflective light redirection element (optically coupled with the light source and on the third face F3 side) which is preferably a prismatic reflective element on the third face F3 side, comprising reflective prisms, in particular oriented towards the third face F3 or towards the second face F2 or which is a transparent element, in particular prismatic (macroprime, multiprisms) on the fourth main face F4 side,

[0025] The preferred light redirection element is: - at least partially opposite the extraction film and even the possible optical insulating coating, - or at most 4 mm away, preferably at most 1 mm, from the extraction film and even the optical insulating coating.

[0026] Preferably, especially for a vehicle roof, the light source is doubled (a first light source along one side of the glazing and a second light source along the opposite side of the glazing), and a second light redirecting reflector element is arranged opposite (optically coupled with the second light source).

[0027] In particular for a vehicle roof, the illuminated laminated glass element of the vehicle comprises, on the fourth face F4, a second light source, preferably an array of light-emitting diodes, and a second light-reflecting redirection element (optically coupled with the second light source and on the third face F3) which is preferably a prismatic reflector on the third face F3, comprising reflector prisms, in particular oriented towards the third face F3 or towards the second face F2, or which is preferably a transparent prismatic element on the fourth main face F4, and the second light-redirection element is: - at least partially opposite the optical insulating coating, - or at most 4mm, preferably at most 1mm, from the optical insulating coating.

[0028] In particular for a vehicle roof, the second light redirection reflector element is preferably a prismatic reflector element on the third face F3, comprising reflector prisms, in particular oriented towards the third face F3 or towards the second face F2 or is preferably a transparent prismatic element on the fourth main face F4.

[0029] According to one characteristic, the light redirection element is a prismatic reflector element, comprising reflector prisms in particular oriented towards the third face F3, arranged on the side of the third main face F3, reflector prisms in contact with the lower intercalated layer or preferably with a local adhesive.

[0030] In a preferred embodiment of the invention, the prismatic element is a flexible polymer (or metallic) film. The film, in particular the prismatic polymer or prism substrate (prismatic layer, organic for example), may be less than 200 µm, 100 µm, 80 µm, or 50 µm thick, and even at least 30 µm thick. If the reflective prisms are oriented towards the third face F3, the substrate film may be tinted and even opaque or opacified. For example, it may be a tinted or even opaque (black) PET supporting the reflective prisms. Preferably, the reflective prismatic element has a total thickness of at most 500 µm, or even 400 µm, 200 µm, or 100 µm, and even at least 30 µm.

[0031] In one embodiment of the invention, the prismatic reflector element is a rigid (micro)textured plate, in particular made of glass or plastic with a reflective layer, or a metal plate, for example a (micro)textured aluminum plate.

[0032] The glazed element may include an optical module carrying the light source. For example, the optical module may be fixed to a peripheral seal, a profiled seal of the glazing (polymer encapsulation, etc.) and / or to the F4 face (outside light injection zone). The optical module may have a face oriented towards the substantially horizontal face F4.

[0033] The glazed element may be available with or without the light source. In one or more embodiments, the glazed element includes the (elongated) light source, in particular an array of light-emitting diodes (LED strip), preferably having a divergence of no more than 8°, positioned on the fourth principal face F4, for example, facing the light redirection element. The light source (each LED) has a principal emission direction relative to a normal to the fourth principal face F4.

[0034] In an embodiment with a light source and a prismatic reflector film, the angle of the principal emission direction of the light source (diodes) with the normal to the plane of the glazing (i.e., the angle of incidence) is preferably no more than 30° and even 25°, preferably with a divergence of no more than 8°. In particular, the principal emission direction with respect to a normal to the fourth principal face F4 emits a cone of light with an angle in the range of 22° ± 4°, or even in the range of 22° ± 2°. Preferably, a collimator can be inserted between the light source and face F4. The light source can be oblique to the plane of the glazing, to face F4. Reflecting prisms can have an inclined (redirecting) face with an angle of 35° to 50°, in particular 40° to 50° with the smooth face (opposite to the textured face).

[0035] In another embodiment with the light source and a prismatic reflector film, the angle of the principal direction of emission from the light source with the normal to the plane (i.e., the angle of incidence) is preferably 0° ± 5°, preferably with a divergence of at most 8°. In particular, the principal direction of emission with respect to a normal to the fourth principal face F4 emits a cone of light with angles in the range [0° ± 4°], or even [0° ± 2°]. Preferably, a collimator can be inserted between the light source and face F4. The light source can be (approximately) parallel to the plane of the glazing. The reflector prisms can have an inclined (redirecting) face with an angle of 30° to 40°, in particular 35° to 40°, with the smooth face.

[0036] Preferably, a collimator can be inserted between the light source and the F4 face. In the simplest case, the collimator is a type of converging lens, with the light source preferably positioned at its focal point. The collimator can be made of glass or transparent plastic, particularly polycarbonate (PC) or polymethyl methacrylate (PMMA). The collimator is preferably attached to an optical module that carries the light source. If the light source is designed as a (linear) arrangement of LEDs, a separate collimator can be provided for each LED. However, it is preferable to use a single collimator for all the LEDs. For example, in the case of a linear LED array, a strip-shaped collimator with a length at least equal to the length of the LED array can be used. The exit face of the collimator can be substantially horizontal.

[0037] According to one characteristic, the vehicle's illuminated laminated glass element includes (particularly on the outer face of the second sheet, in the fourth face F4) an infrared-reflective coating (low emissivity), transparent, single-layer or multi-layer; the infrared-reflective coating comprises at least one electrically conductive functional layer, for example of a transparent conductive oxide, in particular ITO. The infrared-reflective coating preferably comprises a dielectric sublayer, in particular silicon (oxy)nitride, and preferably comprises a dielectric toplayer, in particular silicon (oxy)nitride.

[0038] According to one characteristic, the vehicle's illuminated laminated glass element has an internal infrared-reflecting coating (solar control), such as a stack of silver layer(s), on the second face F2 and covering the entire view on the first sheet or on an additional film, in particular a polymer.

[0039] According to one characteristic, the vehicle's illuminateable laminated glass element comprises, between the upper interlayer and the lower interlayer, above said extraction film, an electro-controllable device, in particular with variable diffusion and / or tint, comprising an electroactive layer between a front electroconductive support on the second face F2 and a rear electroconductive support on the third face F3, or a photovoltaic device, and the lamination interlayer comprises an additional interlayer, the extraction film being sandwiched between the additional interlayer and the lower interlayer.

[0040] According to one characteristic, an electro-controllable device is a liquid crystal cell preferably incorporating dichroic dyes or is an electrochromic layer, in particular the liquid crystal cell is a host-guest cell called "GHLC" (for "Guest-Host Liquid Crystal" in English) or a polymer-based cell such as a PDLC cell (for "Polymer-Dispersed Liquid Crystal" in English), or a PNLC cell (for "Polymer Network Liquid Crystal" in English) or a PSLC cell (for "Polymer stabilized liquid crystal" or a DDPDLC cell (for "Dye-Doped Polymer-Dispersed Liquid Crystal" in English).

[0041] A DDPDLC cell exhibits a discontinuous phase of microscopic liquid crystal (LC) droplets within the continuous polymer matrix phase. The shapes, sizes, and distribution of these droplets depend on numerous physicochemical parameters (and the phase separation method used). When switched off, the DDPDLC scatters light due to the presence of microdroplets with a refractive index different from that of the polymer matrix. The DDPDLC also absorbs light due to the presence of dichroic dyes in the LC phase. The combination of these two properties results in a dark and hazy (opaque) appearance.When illuminated, the dyes and LCs are oriented perpendicular to the film plane, and therefore the light is not (or only slightly) scattered. The refractive index matches that of the polymer matrix, and the absorption cross-section is low, resulting in a transparent and clear appearance. Examples of DDPDLC cells are described in the [reference]. patent application CN 117567875.

[0042] A liquid crystal cell called a guest host cell (or GH for "guest host" in English), with variable color (light to dark state and vice versa), has an electroactive layer comprising a liquid volume of liquid crystals mixed with dichroic (dissolved) dyes, electroactive layer between a support, in particular dielectric and transparent, upper (electrode) comprising an upper electrode in particular transparent, surmounted by an upper alignment layer and a lower (electrode) support in particular dielectric and transparent comprising a lower electrode in particular transparent surmounted by a lower alignment layer, the electroactive layer being between the lower and upper alignment layers, the lower support being closer to the F3 face than the upper support, in particular the guest host cell being surrounded by an intercalated laminated frame layer (based on PVB).A host-guest cell is advantageous because it has a very fast switching time, a strong contrast between light and dark states, low blur, and a color that can be neutral.

[0043] A liquid crystal cell can be a single cell or a set of sub-cells separated by separators forming an interconnected network, preferably polymer-based with a width of no more than 100 pm.

[0044] The glazing can be curved.

[0045] Depending on one characteristic, the laminated glass element comprises at least one of the following functional elements: - an internal, peripheral, opaque masking layer between the second face F2 and the third face F3, and even covering the perimeter of the optical insulating coating and even the coated substrate, particularly in contact with the second face F2, notably defining a view gap, and possibly - an inner, peripheral, opaque masking layer on the fourth face F4, in particular congruent with or narrower than the width of the inner masking layer, - an internal peripheral opaque element which is between the second face F2 and the third face F3, in particular for internal masking of a light source and a light redirection element, in particular transparent prismatic film or reflector, (the substrate of the redirection element is in particular opaque if the reflecting prisms are oriented towards the face F3, for example black glue, etc.), - an internal coating, reflecting infrared radiation, such as a stack of silver layer(s), on the second face F2 on the first, clear sheet, or on an additional film, particularly a polymer, - an external coating, reflecting infrared, such as a transparent conductive oxide layer stack, on the fourth face F4 of the second sheet which is made of mineral glass.

[0046] The invention also relates to a vehicle, in particular a road vehicle, incorporating an illuminable laminated glass element of the aforementioned invention.

[0047] The present invention is now described using examples only. illustrative and in no way limiting of the scope of the invention, and based on the attached illustrations, in which: [Fig. 1] represents a schematic cross-sectional view of a fixed 100 illuminateable laminated glazing of a road vehicle according to the invention and according to a first configuration of the extraction means. [Fig. T] represents a schematic cross-sectional view of a fixed, illuminateable laminated glazing 100 of a road vehicle according to the invention and according to a second configuration of the extraction means [Fig 1a] represents a schematic front view of figure 1 illustrating a roof. [Fig. 2] represents a schematic cross-sectional view of a 200 illuminateable laminated glazing of a road vehicle according to a second embodiment. [Fig. 3] represents a schematic cross-sectional view of a 300 illuminateable laminated road vehicle glazing according to a third embodiment. [Fig. 4] represents a schematic cross-sectional view of a 400 illuminateable laminated road vehicle glazing according to a fourth embodiment, incorporating an electro-controllable device. [Fig. 4a] represents a schematic cross-sectional view of an example of an electrically controllable device such as a liquid crystal cell, inserted into the laminated glazing of Figure 4 and comprising a barrier element. [Fig. 4b] represents a schematic cross-sectional view of another example of a liquid crystal cell, inserted into the laminated glazing of Figure 4 and incorporating a barrier element. [Fig. 4c] represents a schematic cross-sectional view of another example of a liquid crystal cell, inserted into the laminated glazing of Figure 4 and incorporating a barrier element. [Fig. 4d] represents a schematic cross-sectional view of yet another example of a liquid crystal cell, inserted into the laminated glazing of Figure 4 and comprising a barrier element. [Fig. 5] represents a schematic cross-sectional view of a 500 illuminateable laminated road vehicle glazing according to a fifth embodiment. [Fig. 6] represents a schematic cross-sectional view of a 600 illuminateable laminated road vehicle glazing according to a sixth embodiment. [Fig. 6'] represents a front view of the glazing in Figure 6. [Fig. 7] represents a schematic cross-sectional view of a 700 illuminateable laminated road vehicle glazing according to a seventh embodiment. [Fig. 7'] represents a front view of the glazing in figure 7.

[0048] It should be noted that, for the sake of clarity, the different elements of the objects represented are not necessarily reproduced to scale.

[0049] Figure 1 shows a schematic cross-sectional view (here lateral AA) of an illuminable laminated glass element 100 of a vehicle according to the invention, such as a luminous laminated vehicle roof schematically illustrated in front view in Figure 1a, in a first embodiment. In particular, for a fixed roof (canopy), the width is 85 cm to 1.4 m and the length is 75 cm to 1.65 m. This refers to an illuminable laminated vehicle element, 100, rectangular and curved (in one or more directions), comprising: a laminated glazing 1, preferably curved, transparent (at least in one clear (central) pane), a first sheet of glass 1 intended to form the outer pane, for example rectangular (dimensions 1600 x 1100 mm, for example), with a tinted composition (VENUS VG10 or TSA 4+ glass marketed by Saint-Gobain Glass with a light transmission or TL of approximately 28%), for example, with a thickness of 2.1 mm, with a first main face 11 corresponding to face F1, a second main face 12 called face F2, and an edge (longitudinal slices 10 and 10'), face F2 being optionally coated with a transparent functional coating (heating, etc.), or even face F1, a second transparent sheet, preferably mineral glass, 2, here of the same shape and dimensions than the first sheet 1,forming internal glazing, on the passenger compartment side, having a third main face 13 or face F3 and a fourth main face 14 or face F4, and an edge (longitudinal slices 20 and 20') - for example, a sheet of soda-lime glass, extra clear such as Diamant glass marketed by Saint-Gobain Glass with a TL of at least 91%, of a thickness equal, for example, to 2.9 mm, glass with a refractive index n1 of the order of 1.52 at 600 nm or Optiwhite glass of 1.95 mm, or Sunmax glass of 2.05 mm, between face F2 and face F3, a transparent laminated interlayer 3, with a longitudinal slice 30 here aligned or possibly offset from the longitudinal slices 10, 10' towards the center of the glass (therefore recessed), here comprising: an upper interlayer 31, in particular thermoplastic, here based on PVB (with plasticizers (at least 30% by weight), 0.38mm or 0.76mm thick (in one or two sheets), with a refractive index of n3a in the visible spectrum,clear or in a tinted variant, for example tinted grey with a TL of 27%, in adhesive contact with face F2 or with a functional transparent coating on face F2 (in clear glass, in particular a functional transparent coating with a thickness of at most 1 µm or 200 nm), a lower interlayer 32 of PVB (with plasticizers, at least 10% by weight), clear (as transparent as possible and with as few optical defects as possible), for example 0.38 mm or 0.76 mm (in one or two sheets) in adhesive contact with face F3, with a refractive index n3 of approximately 1.48 at 600 nm, for example PVB with a TL of at least 90%.

[0050] The upper adhesive polymer interlayer 31 is preferably PVB-based. Alternatively, the upper interlayer 31 is based on a cross-linked polymer adhesive (OCA), for example, polyacrylate, polyvinyl acetate (PVA), polyurethane (PU), or epoxy. Preferably, the upper interlayer 31 has a thickness of no more than 0.76 mm.

[0051] The lower interlayer 32 polymeric adhesive is preferably to based on PVB, for example Eastmann's PVB RK11. Alternatively, the lower interlayer 32 is based on a cross-linked polymer adhesive (OCA), for example polyacrylate, polyvinyl acetate (PVA), polyurethane (PU), or epoxy. Preferably, the lower interlayer 32 has a thickness of no more than 0.76 mm.

[0052] Alternatively, the lower interlayer 32 is based on clear PVB with little or no plasticizers (for example less than 20% by weight of plasticizers such as Eastmann's PVB RM 11 or even less than 5% by weight, in particular Kuraray SkyViera film or Optical grade Thin Film for example with a thickness of no more than 25 pm.

[0053] Examples of gray-tinted PVB (in various shades of gray), such as the top interlayer31, can be cited, as some PVBs also have acoustic properties. Commercial products listed in Table 1 below are shown. Table 1 presents the L, a*, and b* values ​​of laminated glazing with PVB sandwiched between two 2.1 mm sheets of Saint-Gobain Planilux glass, as well as the TL value of such glazing. [Table 1]

[0054] Furthermore, the laminated glass roof 100 has an internal masking layer 7 forming a masking frame that delimits a glazed area 70 (daylight or view area), here rectangular (Figure 1a) with straight edges. Any local modification of the edges 70 is possible (gradient of points, wider area, etc.). For example, the internal masking layer 7 is: - a black enamel on face F2, - or a black ink, on one of the faces of the upper interlayer preferably the face oriented towards the F2 face, ink preferably based on PVB with black pigments if upper interlayer 31 PVB.

[0055] The masking width at the front (front side edge 10a) is, for example, 10 to 40 cm. The masking width at the rear (rear side edge 10b) is, for example, 5 to 25 cm. The masking width on the long sides (longitudinal edges) is, for example, 5 to 20 cm, the same width or different widths for the two long sides.

[0056] The laminated glazed element (the roof) 100 also includes means for extracting light, light guided in a guiding layer comprising the second sheet 2 and even the lower intercalated layer 32.

[0057] The light extraction means comprise a thermoplastic polymer film 5', separate from a fluoropolymer, called the extraction film, which includes one or more extraction zones 6 or 6', referred to as thin zones, with a width of at most 2 cm, or even 1 cm, and at least one millimeter. The extraction film 5' is located between the upper interlayer 31 and the lower interlayer 32, which have a refractive index n3 in the visible spectrum. The extraction film 5' has a main front face Fa 51' oriented towards face F2 and a main rear face Fb 52' (facing face F3). The extraction film 5' has a propagation length of at least 40 cm, defined along a light propagation axis X.

[0058] The 5' extractor film has a visible refractive index n0 greater than (or equal to) n1. The 5' extractor film is transparent and diffusing. The 5' extractor film has a blur H1 of at least 0.5% and in particular of at most 10%, 5%, 2%, or 1%, with a thickness of at least 50 µm and preferably at most 300 µm or 200 µm.

[0059] To optically isolate a lower portion (with light guide and light extraction) from the upper portion (tinted, absorbent), the extraction film 5' has a functional transparent coating on its rear face Fb, which acts as an optical insulator 5. The optical insulating coating 5 is made of a material comprising a matrix, preferably distinct from a fluoropolymer, with a refractive index n2 in the visible spectrum, a submillimeter thickness Ei, and a thickness of at least 400 nm. The optical insulating coating 5 has a 50' edge. The extraction film 5' has a 50' edge.

[0060] The extraction film 5' is set back from the edges 10, 10', 20, 20' of the sheets 1, 2 by at least 10 mm. The extraction film 5' (which has a surface area S) extends into the view window, and preferably beyond the view window under the peripheral masking layer 7. The extraction film 5' and the optical insulating coating 5 each have a 50' edge, with 50 being under the masking layer 7. The extraction film, even with the optical insulating coating 5, is here less than 200 µm thick, or even at most 100 µm, and is protected at its periphery by one or both of the lower and upper interlayers 31, 32 (preventing creep during lamination). If the upper interlayer is clear, the interface between the two lower and upper interlayers 31, 32 may be indistinguishable.

[0061] The 5' extractor film is in particular a PET film preferably having a TL of at least 80%. For example the 5' carrier film is a clear PET of less than 200 µm (protected by creep of the upper interlayer 31) in particular of 100 µm or 75 µm, with a TL of about 90% or more.

[0062] Alternatively, coating 5 is porous silica.

[0063] To avoid creases and undulations, the coated substrate should preferably be located in a roof area with a curvature, a limited sphericity, particularly with a radius of curvature of at least 1.5 m. For example, the second layer (50) can be sufficiently far from the layer of sheets (1,2). The masking width on the sides and / or front and rear can be adjusted (increased) for this purpose.

[0064] The optical insulating coating 5 is made of a material, preferably a polymer, comprising a separate matrix of a fluoropolymer (or even a cross-linked adhesive) with a submillimeter thickness Ei, at least 400 nm and preferably 500 nm or 800 nm, and a second layer 50, possibly recessed from the layer 50' of the carrier film 5' without compromising the optical insulating function. The optical insulating coating may be applied directly or on a functional sublayer (barrier, etc.), transparent to the carrier film 5'.

[0065] The optical insulating coating 5 has a refractive index n2 in the visible and with n1-n2 which is at least 0.04 in the visible and even at least 0.08 or 0.13, of submillimeter thickness Ei of at least 400nm and even 500nm, and even at least 800nm.

[0066] In one configuration, the optical insulating coating 5 comprises a crosslinked polymer matrix with said n2 index, preferably of at most 1.42 and even at least 1.35, the matrix preferably being among polyacrylate-based polymers with a fluorinated function, in particular urethane acrylate, fluorourethane acrylate, or fluorosilicone acrylate. The thickness is preferably at most 10 µm, 5 µm, or 2 µm and at least 800 nm.

[0067] In another configuration, the optical insulating coating 5 comprises a matrix with a refractive index n2 m greater than n2 and less than n1, and preferably with n2 mof at most 1.48 (and preferably n2 of at most 1.42 and even at least 1.35), and comprising (nano)porosity and / or low-index and / or porous, hollow (nano)particles with a refractive index lower than n1, particularly hollow particles with a size of at most 300 nm or even 100 nm, for example, hollow silica nanoparticles. The thickness is preferably at most 10 pm or 5 pm and at least 800 nm.

[0068] The matrix is ​​a cross-linked or thermoplastic polymer, specifically chosen from polymers based on polyacrylate, polyepoxides, polyvinyl acetate, polyester, polyurethane, PVB, or minerals, particularly silica. Polyacrylate, polyurethane, or even polyepoxide, polyvinyl acetate, and polyester polymer matrices are preferred.

[0069] The optical insulating coating 5 may include a protective transparent layer, with a refractive index greater than n2, and a thickness of submillimeters and even up to 100pm. This protective transparent layer covers the optical insulating coating in contact with the lower interlayer layer 32.

[0070] In a first configuration of the extraction zones (Figure 1), the extraction film 5', which extends continuously over a surface S within the view of the glazing, has, on its rear face Fb 52' and coplanar with the optical insulating coating 5, a high-index transparent coating 6 in localized areas. These localized areas are at most 2 cm wide. The high-index transparent coating 6 has a refractive index n4, where n4 is greater than n0 and greater than n3. Specifically, n4-n0 is at least 0.1, 0.2, 0.3, or 0.4. The high-index transparent coating 6 is at most 50 µm thick, and even 20 µm thick. The high-index transparent coating 6 is deposited, for example, by a liquid process such as, preferably, inkjet printing, or by a mineral process such as physical vapor deposition (PVD) or sol-gel deposition.

[0071] In a second configuration of the extraction zones (Figure T), the extraction film 5', which extends continuously over a surface S within the view of the glazing, has on its rear face Fb 52' the optical insulating coating 5. This optical insulating coating 5 of the extraction film 5' has one or more local recesses 6' that leave the extraction zones, formed directly by the extraction film 5' (for example, made of PET), exposed. The recesses 6' are therefore devoid of the optical insulating coating. The local recesses 6' are at most 2 cm wide. In these local recessed areas 6', the lower interlayer 32 is present (filling the recesses by creep).

[0072] In a third configuration (figures 5, 6 and 7), the extraction film 5' which extends into the view of the glazing and even beyond the view, presents a surface S which does not cover all of the view by presenting one or more through openings 53 in the thickness and preferably not opening laterally.

[0073] In order to illuminate the laminated glass element 100, it also includes a first light source on the face side F4, in particular a first set 4 of light-emitting diodes on their support 40. The light sources are masked from the outside by the internal masking layer 7. In particular, the laminated glass element 100 includes, in a manner masked from the outside by the internal masking layer 7: - 4 light-emitting diodes (here front-emitting) on ​​a support 40 (for example PCB) opposite (or offset from) the fourth main face 14, - on the third main face F3, a light redirection element 8, local, peripheral like a prismatic reflector film.

[0074] You can choose diodes emitting white or colored light for ambient lighting, reading...

[0075] We can plan for several series of diodes 4 (one edge, two edges, three edges, across the entire perimeter) independently controlled and even of different colors.

[0076] The lighting system can be doubled (particularly for the example of the roof in Figures 1, 1', and 1a) by adding, on the opposite side of the first edge, along the longitudinal edges 10' and 20' of the glazed element, additional light sources such as another set of LEDs 4', optically coupled to another light redirection element 8' (identical to the redirection element 8). The additional light sources 4' are masked externally by an internal masking layer 7. The longitudinal edges 10 and 10' of the glazed element do not necessarily have to be parallel. LEDs can also be placed on the front or rear edges.

[0077] The description given above or below regarding redirector element 8 applies to the other redirector element 8'.

[0078] In the detailed view in Figure 1, the light redirection element 8 is, for example, a prismatic polymer film with: - a flat part 81 (substrate for example PET of at most 100µm) glued or fixed by suction to the third face F3 13, - and a textured layer (by embossing, etc.), partially or even fully textured, forming prisms 82 which become reflectors by a reflective layer 83 for example metallic (by conformal deposition on the prismatic textured surface).

[0079] Here the prismatic reflective film 8 is glued with glue 60 on the third main face F3 13, it can also be held by suction.

[0080] The reflective microprisms are oriented towards the second face F2 as illustrated in figure 1 or towards the third face F3 as illustrated in figure T (with in particular in interface with the third main face 13 of the glue).

[0081] The microprisms are schematically represented in cross-section as right triangles (Figure 1), but the angle of inclination of the prism faces with the mean plane of the reflective prismatic film can be adjusted to better direct the light towards the extraction methods described later. Similarly, the principal direction of emission of the light source can be adjusted (normal to the plane or at 22° to the normal, etc.). A collimator can be added between face F4 and the diodes.

[0082] For example, the reflective prismatic film 8 comprises a transparent thermoplastic film, for example based on polyethylene terephthalate (PET), on which transparent prisms are formed from a polyacrylate (reinforced resin, for example by UV) and a metallic layer (conformal deposit) allows the reflective prisms to be formed.

[0083] In another example, a transparent prismatic film (then on the fourth face) comprises a transparent thermoplastic film, for example, based on polyethylene terephthalate (PET), on which the transparent prisms are formed from a polyacrylate (a resin crosslinked, for example, by UV). Alternatively, a macroprism is used on face F4.

[0084] The prismatic reflective film 8 is in adhesive contact here with the lower interlayer 32. The prismatic reflective film 8 forms a longitudinal band like the linear type light source 4 along a longitudinal edge of the glazing for example as seen in figure 1a.

[0085] Alternatively, the prismatic film 8 (parts 81 and 82) is a monolithic polymer film, for example preformed, and the reflective layer 83 is applied.

[0086] The refractive index of the prismatic film 8 is for example from 1.52 to 1.58. The refractive index of the support (for example PET) and / or the textured layer (for example acrylate) is for example from 1.52 to 1.58.

[0087] The light from the diodes 4 is refracted in the second glass 2, in the prismatic reflector film 8 and then redirected at a given angle in the second sheet 2. There is total internal reflection in the second sheet 2 at the interface of the face F4 14 and the air, refraction through the lower layer 32 then total internal reflection at the interface of the optical insulating coating 5 and the lower layer 32 and finally extraction via the extractor film 5' diffusing in the extraction zone(s) 6 or 6'.

[0088] The prismatic reflector film 8 is here under the optical insulating coating 5 of the extractor film.

[0089] As an alternative (figure 3), a macroprism 8, 8' or a prismatic film transparent on the F4 face side is chosen, downstream of the diodes 4, 4'.

[0090] The light redirection element 8, 8' (in particular the prismatic reflective or transparent film) faces the internal masking layer 7. If the laminated glass element has an electrically controlled device 9, such as an active liquid crystal device, the prismatic reflective film 8 between face F2 and face F3 is preferably offset from the active device 9 to avoid overpressure that could damage the cell. Thus, in particular, the prismatic reflective film 8 is larger than the active device 9, with the edge of the active device 9 offset from the edge of the prismatic reflective film 8, closer to the edge of the glass. To avoid an effect of excessive thickness on the prismatic reflective film 8, a preferred safety distance between the edge of the active device 9 and the prismatic film is at least 10 mm, 20 mm, or, in particular, 30 mm.

[0091] The diodes and / or their support can be fixed to face F4 (by an additional part, etc.). Alternatively, the diodes are side-emitting.

[0092] In a first embodiment (Figure 1), the angle of the principal emission direction of the light source 4 with the normal to the plane (i.e., the angle of incidence) is preferably no more than 30°, preferably with a divergence of no more than 8°. In particular, the principal emission direction with respect to a normal to the fourth principal face F4 emits a cone of light with angles in the range of 22° ± 4°, or even in the range of 22° ± 2°. Preferably, a collimator can be inserted between the light source and face F4 14. The PCB support 40 can be oblique with respect to the plane of the glazing. The inclined face of the reflecting prisms (receiving and redirecting the light) can form an angle of 35° to 50°, in particular 40° to 50°, with the mean plane of the reflecting prismatic film (or even of the glazing).

[0093] In another embodiment, the angle of the principal direction of emission of the light source with the normal to the plane (i.e., the angle of incidence) is preferably 0° ± 5°, preferably with a divergence of at most 8°. In particular, the principal direction of emission with respect to a normal to the fourth principal face F4 emits a cone of light with angles within the range [0° ± 4°], or even [0° ± 2°]. Preferably, a collimator can be inserted between the light source and face F4 14. The PCB support 40 can be parallel to the plane of the glazing. The inclined face of the reflecting prisms can form an angle with the mean plane of the reflecting prismatic film (or even the glazing) of 30° to 40°, in particular 35° to 40°.

[0094] To avoid stray light passing through the film and even the masking layer 7, an additional internal opaque element can be added to the prismatic film 8, such as opaque (black) ink, particularly on the front face 5T of the extractor film 5', or a black PET film glued or placed on top, or the frame layer 34 of Figure 4, which can be opaque.

[0095] As illustrated in Figure T, the laminated glass element 100' may further comprise: an external coating 15, in particular infrared reflective (low emissivity), such as a stack of transparent conductive oxide (TCO) layers (in particular based on indium tin oxide (ITO)), on face 14 of the second mineral glass sheet, as the fourth face F4, and / or an internal coating 16 infrared reflective (solar control), such as a stack of silver layer(s), as the second face F2 and covering the entire view area on the first sheet 1 or on an additional film, in particular polymer.

[0096] Figure 2 shows a schematic cross-sectional view of a laminated glass element 200 for a road vehicle, according to a second embodiment and in a variant of Figure 1. This glazing 200 differs from the first glazing 100 in that the light redirection element 8, 8' (prismatic film) is positioned on the exterior side of the glazing, facing F4 against the fourth principal face 14 of the second glass sheet 2, and is reversed. The transparent prismatic film 8, 8' is opposite the light sources 4, 4'. The prismatic film 8, 8' is a textured film or has a textured layer (but no reflective layer).

[0097] Figure 3 shows a schematic cross-sectional view of a laminated glass element 300 for a road vehicle according to a third embodiment and in a variant of Figure 1. This glazing 300 differs from the first glazing 100 in that: the light source 4 (LED array) is arranged on face F4 with the support 40 positioned (spaced or against) and oriented perpendicular to the fourth main face 14 of the second glass sheet 2, the light exiting parallel to face F4, a light redirection element forms a beveled macroprism 8a, 8'a and is coupled to the light source 4, 4' the macroprism serving to redirect the light rays into the second glass sheet 2 which forms part of the light guide with layer 32, face F2, in the clear view, is coated with a transparent functional coating 16 reflecting infrared (solar control) silver stacking for example; face F4 is coated with a low emissivity coating 15 reflecting infrared for example IOO.

[0098] Alternatively, the light is injected through the 20 and / or 20' edge of the second sheet 2. The second sheet 2 can be shorter with a step in line with the rest of the glazing, to accommodate the light sources.

[0099] In yet another alternative, the second sheet of glass 2 has a through hole closed by a cover on the third face 13, a hole housing the diodes 4 or even the diode support 40. A cover can close the hole and be fixed on the fourth face 14. Two coupling holes can be had, for example, along the front edge of the glazing.

[0100] Figure 4 shows a schematic cross-sectional view of a laminated glass element 400 for a road vehicle according to a fourth embodiment and in an alternative embodiment of Figure 1. Figures 4a to 4d each show a schematic cross-sectional view of an example of a liquid crystal display (DCD) cell as an electrically controlled device, inserted into the laminated glass of Figure 4 and comprising a barrier element. This glass 400 differs from the first glass 100 in that it includes an electrically controlled device 9 between the upper interlayer 31 and the coated substrate. There are no light sources 4, 4' on the side of face F4, but alternatively, they could be included in addition to the electrically controlled device 9. An additional interlayer 33 is then integrated into the laminated glass element, between the upper interlayer 31 and the extractor film 5', to laminate the electrically controlled device 9.

[0101] Since the thickness of the device 9 is 0.4 mm, an intermediate frame layer 34, 0.38 mm thick, made of clear or tinted PVB, is added. The edges of the electrically controlled device 9, as well as the intermediate frame layer 34, are under the internal masking layer 7. The upper intermediate layer 31 is, for example, clear or tinted PVB. The additional intermediate layer 33 is clear. Outside the injection zone, the edge of the liquid crystal cell 9 is at least 10 mm or 15 mm from the edge of the glazing. The internal masking frame layer 7 (for example, opaque PVB) is of a width adapted accordingly and can extend to the edge of the glazing.

[0102] The extraction film 5' is then in adhesive contact with the additional intercalated layer 33 and the lower intercalated layer 32.

[0103] In addition, compared to figure 1, the light redirection element 8, 8' is reversed, the reflecting prisms (the reflective coating) being oriented towards face F3 and made solid to the second sheet 2 by glue.

[0104] The electro-controllable device 9 is here a liquid crystal cell with variable absorption and diffusion of light, such as a PDLC cell or a DDPDLC cell (also with variable tint).

[0105] In comparison to the examples in Figures 4a to 4d, the liquid crystal cell 9 comprises: - an upper support 91 (polymer, in particular PET or glass) with an upper electroconductive coating 92 (for example ITO) on the second side F2, - a lower 9T support (polymer, notably PET or glass) with a lower electroconductive coating (for example ITO) 92' third side F3, - an electroactive layer 93 which is a PDLC layer, and glass spacers 93', in contact with respectively the first and second electroconductive coatings 92 and 92' and the electroactive layer 93.

[0106] Preferably, if glass, one or both supports 91 and 9T are made of chemically tempered glass. Each of the supports 91 and 9T has a thickness of less than 1000 µm, specifically between 25 µm and 700 µm, preferably less than 300 µm, or even less than 200 or 100 µm. The glass thickness of each support is sufficiently thin to provide the liquid crystal cell with film-like flexibility when bonding the liquid crystal cell to the glass sheets 1 and 2, especially when the latter are curved. In particular, the glass thickness of each of the supports 91 and 9T is such that each glass support has a minimum radius of curvature of at least 600 mm and can even be as low as 200 mm.

[0107] Preferably, the lower support and the lower electrode extend beyond the upper edge in a first protruding zone, and the upper support and the upper electrode extend beyond the lower edge in a second protruding zone opposite the first protruding zone (see Figure 4a or Figure 4b). Current-carrying strips 90 are added to the electrodes in these first and second protruding zones.

[0108] The glazing preferably includes a barrier element 94 or 94', or 95 or 95', around the periphery of the DDPDLC device, separating the electroactive layer from the lamination interlayer, here 31, 32, around the perimeter of the electroactive layer. Figures 4a to 4d each represent different cases of barrier element.

[0109] In figure 4a, the barrier element 94 here is external, comprising a pair of coupled polymer barrier films, notably without plasticizers: - covering all or part of the first protruding area and even extending onto the upper surface and / or extending to the rear surface, - covering all or part of the second protruding area and extending over the back face and even extending to the top face.

[0110] In particular, it consists of two polymer barrier films: a first film which is a polymer frame (PET), notably with a Z-shaped cross-section (three portions 941, 942, 943), coupled to a second film 944 which is a rectangular cross-section frame. [OR I] In figure 4b, it is a 94' joint which covers the first and second protruding areas, for example polymer, in particular epoxy resin or silicone.

[0112] In Figure 4c, an internal peripheral seal 95 provides the seal for the liquid crystal cell, for example, a polymer, particularly one made of epoxy resin or silicone. The internal seal 95 is, for example, 5 mm.

[0113] In figure 4d the peripheral sealing joint 95' is outside both supports 91 and 9T.

[0114] It is generally preferable to conceal the barrier element from the outside and even from the inside.

[0115] The electrically controlled device can have variable color.

[0116] The electrically controlled device can be segmented (not illustrated) at least in the clear glass, into several cell regions by at least one electrical discontinuity, in particular of submillimeter width, formed in one of the upper or lower electrodes, in particular obtained by laser, each cell region having an electrical supply.

[0117] Figure 5 represents a schematic cross-sectional view of a laminated glass element 500 of a road vehicle according to a fifth embodiment and according to the configuration in which the extraction film 5' is discontinuous in the clear view, the extraction film having several through openings 53 in the thickness.This glazing 500 differs from the first glazing 100 in that: the extraction film 5' does not extend fully over the entire surface of the clear view but locally in a discontinuous manner (in several places according to the through openings 53) with the high index transparent coating 6 on the back face; there is only one upper interlayer 31 and the PET extraction film 5' is bonded to the second sheet 2 by means of the high index transparent coating 6 (which strengthens the adhesion); the light redirection element 8 is in the same plane as the extraction film and is on face F3 with the prisms oriented towards face F3 and made solid to the second sheet 2 by local adhesive; face F2 in the clear view is coated with a transparent functional coating 16 reflecting infrared (solar control) silver stacking for example; face F4 is coated with a low emissivity 15 electroconductive coating that reflects infrared radiation.

[0118] Figure 6 shows a schematic cross-sectional view of Figure 6' of a laminated glass element 600 for a road vehicle according to a sixth embodiment and in the configuration where the extraction film 5' is discontinuous in the visible area, the extraction film having several through-holes 53 in its thickness. Figure 6' is a front view of the glazing of Figure 6. This glazing 600 differs from the first glazing 100 in that: the first sheet 1 is clear (instead of tinted); an active device 9 (for example, a PDLC cell or a DDPDLC cell) is integrated into the glazing between the first interlayer 31 and a lower interlayer 32. To compensate for the thickness of the device, an interlayer frame 34 is present, for example 0.38 mm thick, made of PVB, clear or tinted. The edges of the active device 9 as well as the interlayer frame 34 are under the internal masking layer 7; the upper interlayer 31 is tinted (a tinted PVB); the extractor film 5' does not extend over the entire surface of the viewing window but locally discontinuously (in several places which correspond to the through-holes 53) with the high-index transparent coating 6 on the back; the PET extractor film 5' is bonded to the second sheet 2 by means of the high-index transparent coating 6 (which strengthens the adhesion); the light redirection element 8 is in the same plane as the extractor film and is on face F3 with the prisms oriented towards face F3 and made bonded to the second sheet 2 by local adhesive;face F2 in the clear view is coated with a transparent functional coating 16 reflecting infrared (solar control) silver stacking for example; face F4 is coated with a low emissivity electroconductive coating 15 reflecting infrared.;

[0119] Figure 6' shows an example of a configuration for the extraction film 5' of surface area S, in the form of perpendicular longitudinal and transverse strips that provide the through-openings 53 and extend across the viewing area and even beyond it to be integral with a frame-shaped portion 5" that is outside the viewing area. The frame-shaped portion 5" of the extraction film 5' facilitates handling of the extraction film. The frame advantageously has at least two opposite edges without any lateral openings. The width of the frame-shaped portion 5" is preferably at least 10 mm and at most 20 mm. The viewing area is delimited by a frame, for example, made of black enamel, no more than 2 cm wide, which conceals the light sources and light-redirecting elements on both sides.

[0120] Figure 7 shows a schematic cross-sectional view of a laminated glass element 700 for a road vehicle according to a seventh embodiment and in the configuration where the extraction film 5' is discontinuous in the visible area, the extraction film having several through-holes 53 in its thickness. Figure 7' is a schematic front view of the laminated glass element 700. This glazing 700 differs from the first glazing 100 in that: the first sheet 1 is clear (instead of tinted); the extraction film 5' does not extend fully over the entire visible area but is locally discontinuous (in several places corresponding to the through-holes 53) with the high-index transparent coating 6 on the back; the face F4 is optionally coated with a low-emissivity electroconductive coating 15 that reflects infrared radiation.

[0121] Intercalated layer 31 (or 32) is optional.

[0122] Figure 7' shows another example of the configuration of the extraction film 5' with surface area S, in the form of oblique strips that provide the through-holes 53 and extend across the viewing area and even beyond it to be integral with the frame-shaped portion 5" that is outside the viewing area. The frame-shaped portion 5" of the extraction film 5' facilitates handling of the extraction film. The width of the frame-shaped portion 5" is preferably at least 10 mm and at most 20 mm. The viewing area is delimited by a frame, for example, made of black enamel, no more than 2 cm wide, which conceals the light sources and light-redirecting elements on both sides.

Claims

DEMANDS 1. Illuminatable laminated glass element for vehicles, particularly road vehicles (100 to 900), comprising: - laminated glass, preferably curved, transparent, comprising: - a first transparent sheet (1), made of mineral glass, with a first main face F1 (11), a second opposite main face F2 (12) and a first slice (10), intended to form the outer glass, - a polymer laminate interlayer (3, 31, 32, 33, 34, 35) comprising a top interlayer (31), in adhesive contact with the second face F2 or with a functional transparent coating on the face F2, - a second transparent sheet (2), made of mineral glass or polymer, with a third principal face F3 (13), a fourth principal face F4 opposite (14) and a second slice (20), with a refractive index n1 in the visible - between the upper intercalated layer and the face F3, means for extracting light, light guided in a guide layer comprising at least the second sheet (2), characterized in that the means for extracting light comprise a polymer film (5'), distinct from a fluoropolymer, with a main front face Fa (5T) oriented towards the face F2 and an opposite main rear face Fb (52'), called extracting film, having a blur H1 of at least 0.5%, the polymer film having a refractive index nO in the visible greater than or equal to n1, and forming one or more extraction zones, called fines, of width of at most 2cm and at least millimeter.

2. Illuminatable laminated glass element of vehicle according to claim 1 characterized in that the blur H1 is at most 5% and even at least 0.7%.

3. Illuminatable laminated vehicle glass element (100) according to claim 1 or 2 characterized in that the extractor film (5') is a polyester film and preferably PET, preferably having a TL of at least 80%.

4. Illuminatable laminated vehicle glass element according to one of the preceding claims characterized in that the extractor film (5') has on the rear face Fb (52') a high index transparent coating (6) with a refractive index n4 greater than n0 in particular n4-n0 of at least 0.

1.

5. Illuminatable laminated vehicle glass element according to any one of the preceding claims characterized in that the extractor film (5') has a surface S extending into a clear view, and has one or more through openings (53) in the thickness.

6. Illuminatable laminated vehicle glass element according to any one of the preceding claims characterized in that the extractor film is in adhesive contact with face F3 (13) via an adhesive which is a high index transparent coating (6) with a refractive index n'4 greater than n0 in particular n'4-n0 of at least 0.

1.

7. Illuminatable laminated glass element of a vehicle according to any one of claims 1 to 4, characterized in that - the extraction film (5') is extended, presenting a surface S, extending in a clear vision, - the extractor film has an optical insulating coating (5) on the rear face Fb, and an edge (50) with a refractive index n2 in the visible, a submillimeter thickness Ei and a thickness of at least 400nm, - the extraction film is between the upper interlayer and a lower interlayer (32) with a refractive index n3 in the visible, in adhesive contact with the third face F3 or with a functional transparent coating on the face F3, - n2 is less than n1, the difference in refractive indices n1-n2 being at least 0.06 in the visible spectrum, and - the optical insulating coating (5) has one or more cuts (6') leaving the said extraction zones of the extraction film exposed.

8. Illuminatable laminated vehicle glass element according to the preceding claim characterized in that a high index transparent coating (6) with a refractive index n4 greater than n0 in particular n4-n0 of at least 0.1, is on the rear face Fb at the right of the spacer(s) (6') or on the lower interlayer.

9. Illuminatable laminated glass element of vehicle according to the preceding claim characterized in that the difference of refractive indices n1-n2 is at least 0.08 in the visible and in that the thickness Ei is at least 500nm, and even at least 800nm.

10. Illuminatable laminated vehicle glass element according to any one of claims 7 to 9, characterized in that the optical insulating coating (5) comprises a crosslinked polymer matrix with said index n2, preferably of at most 1.42, matrix preferably among polyacrylate-based polymers with a fluorinated function, in particular urethane acrylate or fluorourethane acrylate or fluorosilicone acrylate, and / or in that the optical insulating coating (5) comprises a matrix with a refractive index n2 m greater than n2 and less than n1, and preferably with n2 mof at most 1.48 and n2 preferably of at most 1.42, and includes porosities and / or low index particles, with a refractive index less than n1, in particular hollow ones.

11. Illuminatable laminated glass element of vehicle (100) according to one of the preceding claims characterized in that it comprises a light source (4), in optical coupling with the second sheet of glass (2).

12. Illuminatable laminated glass element of vehicle according to one of the preceding claims characterized in that it comprises, on the fourth face F4 side, a light source (4), preferably an array of light-emitting diodes, and a light-reflecting redirection element (8) which is preferably a prismatic reflecting element on the third face F3 side, comprising reflecting prisms, in particular oriented towards the third face F3 or towards the second face F2 or which is preferably a transparent element on the fourth main face F4 in particular prismatic.

13. Illuminatable laminated vehicle glass element according to any one of claims 7 to 10 characterized in that it comprises between the upper interlayer (31) and the lower interlayer (32), above said extractor film (5'), an electro-controllable device, in particular with variable diffusion and / or tint, comprising an electroactive layer between a front electroconductive support on the second face F2 and a rear electroconductive support on the third face F3, or a photovoltaic device, and in that the lamination interlayer comprises an additional interlayer (33), the extractor film (5') being sandwiched between the additional interlayer (33) and the lower interlayer (32).

14. Illuminatable laminated glass element of a vehicle according to any one of the preceding claims, characterized in that it comprises at least one of the following functional elements: - an internal masking layer (7), peripheral, opaque, between the second face F2 and the third face F3, and even covering the perimeter of the extraction film, particularly in contact with the second face F2, notably defining a clear window, and possibly - an inner, peripheral, opaque masking layer on the fourth face F4, in particular congruent with or narrower than the width of the inner masking layer, - an internal peripheral opaque element located between the second face F2 and the third face F3, specifically for internal masking of a light source and a light redirection element, in particular a transparent prismatic film or reflector, -an internal coating (16), reflecting infrared radiation such as a stack of silver layer(s), on the second face F2 on the first, clear sheet, or on an additional film, in particular a polymer, - an external coating (15), reflecting infrared, such as a transparent conductive oxide layer stack, on the fourth face F4 of the second sheet (2) which is made of mineral glass.

15. Vehicle, in particular road vehicle incorporating an illuminable laminated glass element according to one of the preceding claims.

Images