WO2012028819A1

WO2012028819A1 - Illuminating decorative panel based on light-emitting diodes

Info

Publication number: WO2012028819A1
Application number: PCT/FR2011/051985
Authority: WO
Inventors: Aude Montgermont; Jingwei Zhang; David Delhorme
Original assignee: Saint-Gobain Glass France
Priority date: 2010-09-02
Filing date: 2011-08-30
Publication date: 2012-03-08
Also published as: TW201243213A; FR2964446B1; FR2964446A1; CN203633879U

Abstract

The invention provides an illuminating decorative panel (100) based on light-emitting diodes, which comprises a glazing pane (1), a first decorative area (60), visible as the front face (12), and a first group of light-emitting diodes (2), on the rear face (11) side. The emitted beam is divergent. The panel includes a section strip (3) forming a reflector, which reflects the light from the diodes (2) and is placed on the rear face side, said section strip having a main reflecting surface (30) facing the group of diodes, which is oblique to the rear face and capable of directly receiving rays called the central rays from said first group of diodes and sending them onto the first diffusing means, and a reflecting surface called the upper surface (32) facing the rear face (11) and capable of directly receiving rays called the upper lateral rays (B) from said first group of diodes, diverging from the rear face (11), and sending them onto the first diffusing means (4) or onto the oblique main reflecting surface. The extent of the main reflecting surface (30) and the extent of the upper reflecting surface (32) are such that at least 80% of the upper lateral rays (B) are reflected onto the first diffusing means (4).

Description

DIODES DECORATIVE AND LIGHTING PANEL

ELECTROLUMINESCENT

The present invention relates to decorative panels and more particularly to a decorative panel and illuminating light emitting diodes.

Light-emitting diodes (LEDs) were originally used to provide warning lamps or indicator lights for electrical and electronic devices, and have already been used for a few years to illuminate signaling devices such as traffic lights. signaling, motor vehicle lights (turn signals, position lights), or portable lights or markers.

The interest of the diodes is their long life, their illuminating efficiency, their robustness, making the equipment employing them more durable, and requiring a reduced maintenance.

Recently their use has developed in the field of mirrors to provide illuminating mirrors.

European patent application EP 1 834 551 discloses a diode illuminating mirror. Such a mirror is designed by the laminated assembly of a reflective glass sheet on the rear face fulfilling the mirror function, a clear lamination structure and a clear glass sheet front.

The diodes are inserted into the 0.76 mm polyvinyl butyral (PVB) lamination interlayer and connected by an electroconductive layer with insulated areas deposited on the reflective glass sheet. The diodes comprise directional means for orienting the rays substantially perpendicularly to the clear glass sheet.

The diodes are further distributed around a transparent window formed in the clear glass facade of 3.15 mm and constituting the mirror as such. The facing surface of the diodes is sandblasted to disperse the light.

However, such a mirror is complicated to produce; expensive, and its optical performance is not optimal.

The aim of the invention is to propose a simpler and more optically efficient decorative and illuminating diode panel that is more compatible with industrial requirements (ease and speed of production, reliability, etc.).

The invention further proposes to expand the range of decorative and illuminating panels. For this purpose, the present invention firstly proposes a decorative and illuminating panel which comprises:

a glazing, in particular a plane, made of inorganic or even organic glass, with a first main face forming the front face, and a second main face forming the rear face,

at least one first decorative zone, in particular forming a mirror, visible on the front face,

at least one first group of light-emitting diodes on the rear side; the diodes having a given emission spectrum in the visible, in particular polychromatic, each of the diodes having a main emission radius F, said first principal beam given, especially aligned diodes along an axis,

at least one first illuminating zone, in particular elongated, by the light coming from said first group of diodes, visible on the front face, and adjacent to the first decorative zone, said first illuminating zone being provided with first diffusing means associated with the glazing unit.

The beam of each diode of the first emitted group is divergent and defined by a half-angle at mid-height of at least 30 ° (well-known angle defined from the angle radius F at 0 °), the adjacent diode bundles of the first group overlapping on the surface of the first diffusing means.

The diodes are arranged so that the first main beam (F) is substantially parallel to the flat glazing (or to the average plane of the glazing if it is curved), typically up to +/- 5 ° with respect to the glazing.

And the panel further comprises a profile forming a reflector of the light coming from said first group of diodes, monolithic or in several parts preferably joined, and placed on the back side, pressed against or fixed to a panel, reflector comprising:

a main reflecting surface facing the group of diodes, in particular planar or concave with respect to the first group of diodes, oblique with respect to the rear face and able to directly receive so-called central beams of said first group of diodes including the first main beam F and returning them to the first scattering means in an area between the diodes and the main reflecting surface,

a so-called upper reflective surface, in particular joined to the main reflecting surface, opposite the rear face and able to receive direct so-called upper lateral radii of said first group of diodes deviating from the rear face and to send them back

- on the first diffusing means

- or on the main reflecting surface (which sends them back to the first diffusing means)

the extent of the main reflecting surface and the upper reflecting surface being such that at least 80% or even 100% of the upper side rays are reflected to the first scattering means.

In the prior art, the diodes are facing glazing for a completely direct lighting. Dots (focal spots) are formed too bright opposite the diodes, the contrast between these points and the zones between the diodes being difficult to suppress even with diffusing means provided. According to the invention the central rays, the most intense, first encounter the main reflecting surface and then the first scattering means, the lighting is then softer and distribution more homogeneous without glare.

A diverging beam (and not parallel as in the prior art) is also chosen to spread the light sufficiently on the diffusing means.

The diodes are positioned to form a continuous illuminating area along the length. The "intra-group" distance between adjacent diodes of the first group may preferably be the same for all the diodes to simplify beam overlap.

In the present invention, the term "light-emitting diode" (or shortened diode) means a quasi-point source, generally inorganic, typically based on a semiconductor chip, a source distinct from an OLED (organic diode) providing an extended illuminating surface .

The main reflecting surface can reduce the width of the surface of the first illuminating area and its shape, preferably in strip, and allow to leave an adjacent decorative area of size and shape also adjustable.

The first illuminating area is elongated and a reflector is chosen which is a profile (a piece longer than wide). The first illuminating area is typically an illuminating strip with a first longitudinal edge and a second longitudinal edge.

Preferably, if the first illuminating area is peripheral, the main reflecting surface is on the side of the first longitudinal edge most toward the center of the glazing (and the diodes closer to the second longitudinal edge near the glazing edge). It is preferred that the reflector profile has no - (substantially) vertical wall - over the length (useful) of the profile, in particular partitioning (laterally) a diode or diodes of the first group.

The design in illuminating zone (s) is very flexible.

With several groups of diodes it is possible to form several distinct illuminating zones or not.

To form illuminating strips of distinct orientations, such as an illuminating frame, an L or an illuminating cross, it is possible to use a reflector of suitable shape and preferably in one piece for the main reflecting surface and the upper reflecting surface, or even for a so-called lateral surface carrying diodes and facing the main reflecting surface.

To be as unobtrusive as possible and maximize the area of the decorative area, the reflector preferably occupies a limited space.

The surface (in particular the width) of the first illuminating zone may preferably be substantially equal to the surface (in particular the width) of the first diffusing means thus avoiding glare in the illumination zone (s) via the bare, transparent, non-transparent glazing. diffusing area.

The first longitudinal edge of the first illuminating area (preferably first diffusing means) may be straight or curved. The first illuminating zone, in strip, may be straight or curved. The first illuminating zone may be annular or at least with one of the longitudinal edges describing a circle or an ellipse-like shape. In particular, a main reflective surface describing a circle or an ellipse-like shape and delimiting one of the longitudinal edges of the illuminating zone is chosen.

Preferably, for simplicity, the diodes of said group are chosen with the same (only) main direction of emission F.

And preferably, for uniform illumination, the diodes are chosen with the same spectrum, mono or polychromatic.

The emission cone may be symmetrical or asymmetrical with respect to F. The emission cone may be, for example, lambertian.

The half-angle at half height may preferably be at least 50 °, preferably at least 60 ° or even at least 70 °.

The central rays that are redirected by the main reflecting surface may form at least 30% of the total emission flux of the diodes of said group, or even at least 50% of the total flow of the diodes. For each diode of the group, it is possible to define a set of illuminating rays forming the central rays in an emission cone around the main direction of emission and corresponding to at least 30% of the flux emitted by this same diode, even to 50%.

To determine the total flow said S2 emitted by the group of diodes, is conventionally used a goniometer arranged to measure all the emitted (primary) rays.

To determine the total flux reflected S1 said, the goniometer is used to measure the emitted (primary) radiation of the group of diodes and reflected by the reflector. S1 / S2 is preferably greater than or equal to 30% or even 50%.

The main reflecting surface according to the invention can also be used to recycle the light backscattered by the diffusing means and / or reflected on both sides of the diodes on a support of the diodes (PCB support of the diodes in particular).

The upper reflecting surface may extend from the main reflecting surface (in particular by extending the part and / or by adding a reflective layer on a facing wall) to receive the most lateral radius (diverging).

Naturally, according to the invention, preferably at least part (or all) of the lower side rays (that is to say beyond the central rays) going directly to the rear face (without encountering reflections) meets the first diffusing means.

The reflector according to the invention may comprise a first reflection reflection zone of the emitted rays, in particular a first end (of the main reflective surface) of the reflector (ridge, etc.), forming an angle α1 with the main emission direction F, l the extent of the first diffusing means being such that the majority, or even at least 80%, or even 100%, of so-called lateral radii beyond oc1, and towards the rear face are diffused by the first scattering means.

If the first reflection limit zone of the transmitted rays touches the rear face or is very close to it, it is of course not necessary to extend the first diffusing means beyond the contact zone (towards the distance of the diodes).

If the first reflection limit zone of the emitted rays does not touch the rear face and is too spaced, it is thus desirable to extend the first diffusing means beyond the zone under the end of the main reflective surface in a zone. said marginal (towards the distance of the diodes), to use the maximum radii for the first illuminating area. It is preferred to limit the width of this illuminating marginal zone to less than 10 mm.

In addition, it may be preferred to extend the first scattering means to the level where the most divergent radius, that is to say defined by an angle corresponding to the maximum half-angle of emission, meeting the rear face.

For the reflection of the central rays, the main reflecting surface can form an acute angle of 20 ° to 60 °, in particular 30 ° to 50 ° relative to the rear face.

The main reflecting surface extends as far as contact with the back face or up to a maximum clearance of less than 5 mm with the back side.

The main reflecting surface and / or the upper reflecting surface may be a reflective layer (specular or diffusive reflection) for example:

a glossy metallic layer (specular reflection, in particular with a reflection coefficient greater than or equal to 70% or even 80%) or matte (diffusive reflection),

- a diffusing layer (enamel, white lacquer ....).

A so-called main part of the reflector with the upper reflecting surface and / or a so-called upper part of the reflector with the upper reflecting surface and / or a so-called lateral part of the carrier reflector of the group of diodes may comprise a substrate (preferably mineral):

- coated with a reflective layer (specular or diffusive reflection) for example,

coated with a shiny metallic layer (specular reflection, in particular with a reflection coefficient greater than or equal to 70% or even 80%) or matte (diffusive reflection),

- coated with a diffusing layer (enamel, white lacquer ....),

- textured or rough to be diffusing,

- Which is metal including anodized aluminum.

In a preferred embodiment, the reflector profile is metallic, preferably having a thickness of less than or equal to 3 mm or even 1 mm, which comprises:

a so-called main portion which is elongated and oblique with respect to the rear face, in particular plane or concave towards the diodes, comprising the main reflecting surface,

an elongated upper part, extending the main part, in particular plane or concave towards the diodes, facing the rear face, comprising the upper reflecting surface. Typically, the main reflective surface and the upper reflective surface can be formed by folds and / or bends and / or by molding and / or extrusion.

The reflector profile according to the invention may preferably have a flared L-shaped cross-section (formed by the main part and the upper part), or even flared U formed by the main part and the upper part and a lateral part carrying the diodes.

The main part may have an end spaced from the rear face and curved towards the opposite direction to the diodes to spread the beam, in particular by folding the flat profile piece, of straight section (metal sheet in particular).

Preferably, the diodes of the first group are arranged on a piece which is a profile preferably of metal, in particular aluminum, copper or stainless steel, thus forming a first thermal conductor.

Thus the diodes are not directly connected to connection circuits on a window but are fixed on a profile (preferably part of the reflector). It is thus possible to perform diode tests on this profile before integration into the panel, thereby reducing the scrap rate of the panel. Similarly, in case of necessity (maintenance, color change, power), it is easy to remove such a carrier profile of the diodes.

This profile may optionally comprise other groups of diodes to form another illuminating strip, for example in the extension of the first illuminating strip.

Heat dissipation by the thermal conductive profile further avoids degrading the efficiency of the diodes, and therefore ensures to provide an even better light efficiency and ensures the durability of the diodes.

Advantageously, the diodes of the first group, in particular substantially aligned, are (regularly) distributed over a first elongated common support, the first support being a printed circuit board, in particular a strip preferably disposed on a particularly metallic profile.

A printed circuit board (PCB) is in the form of a large plate or a narrow strip. It is made of plastic or is metallic. Most often, a bar is metallic, while the plate is plastic.

The diode support (PCB) may be of any shape, for example flat, in particular a strip, for example rectilinear of square cross-section or rectangular. The use of such a support with its connection circuits already simplifies the manufacture and maintenance of the panel and further limits the scrap rate.

We have seen that the evacuation of heat avoids degrading the efficiency of the diodes, and therefore guarantees to provide an even better light efficiency and ensures the durability of the diodes.

Also, advantageously, in particular for diodes of medium or high power, the first support (PCB) can be made integral with a first thermal conductor of the metal type, in particular aluminum, copper or stainless steel, preferably formed by a (lateral) part of the reflector, said first support incorporating heat dissipation means and / or being associated with heat dissipation means connected to the first thermal conductor.

The heat dissipation means, integrated and / or associated with the first support (PCB) of the diodes may be constituted by the material constituting the first support, of the metallic type, or by metal surfaces integrated in the first electrical insulating support, and possibly by means of means for securing the first support to said first thermal conductor, in particular formed by a portion of the reflector (3), which are thermally conductive, of the type adhesive or thermally conductive adhesive tape and made of an electrical insulating material if the support is electrical insulator.

Preferably the diode support (PCB) is metallic and the diodes are soldered on tracks which are electrically insulated from the metallic material. The metallic material of the support being thermal conductor, the support can be directly pressed against a thermal conductor to obtain the heat dissipation.

The attachment of the support (PCB) to a thermal conductor can be achieved for example by clipping and / or screwing. We can insert a thermal conductor (type thermal grease, thermal tape and / or thermal glue ...) to obtain even better heat dissipation, and this for better light efficiency and durability of the diodes.

The adhesive tape has the advantage of providing a calibrated thickness, allowing the support to be perfectly flat and to ensure that the diodes are all equidistant from the reflector. In addition, the adhesive tape allows its prior attachment to the support.

An assembly of the diode support (PCB) via a double-sided adhesive or a curable adhesive (which does not provide immediate fixation) is preferred because it allows relative positioning of the small support on the reflector. With a support (PCB) of plastic diodes, the diodes are soldered on heat dissipating surfaces (called "thermal pad" in English) reported on the two opposite faces of the support and through its thickness. Fixing is necessarily performed by an electrically insulating thermal conductive joining material associated with heat dissipation surfaces. The thermal conductive bonding material is for example thermally conductive adhesive or double-sided adhesive tape, already mentioned.

For even better light efficiency, the first support (PCB) can carry a free surface (flat or inclined) around the first group of diodes and diffusing, for example lacquer or paint. For example, a white reflector is used.

According to one characteristic, the diodes can be encapsulated, that is to say include a semiconductor chip and an envelope, for example epoxy resin type or PMMA, encapsulating the chip. The functions of this envelope can be multiple: protection of the oxidation and humidity, conversion of wavelength, diffusing element.

The diode may be for example a semiconductor chip of the order of one hundred μηη or mm; and possibly with a minimal encapsulation for example of protection. It is not necessary to use optics such as lenses directing the light emitted by the diode to the privileged areas. The diodes can be embedded in a common protective material (waterproof, dustproof ...).

Preferably, the diodes can thus be simple chips or with a low volume encapsulation of the SMD type ("Surface Mounting Device" in English) or "Chip on Board" rather than the conventional, (first generation) voluminous diodes. low power and luminous efficiency.

The diode can be:

a diode "medium power" that is to say greater than 0.1 W or brightness greater than or equal to 8 lumens,

a diode "high power" that is to say greater than or equal to 1 W or brightness greater than or equal to 80 lumens.

From a dimensional point of view, at least one of the following characteristics can be provided for the diodes:

the diodes are less than 1 cm high, or even 5 mm,

the diodes are of width (diameter) less than 1 cm, the diodes are identical and regularly spaced from each other with an intra-group distance designating the distance between the axes of the successive diodes, possibly of the same order as the eigenvalues of the diodes,

the number of diodes of the first group is at least equal to 10.

The robustness of the diodes is particularly interesting in intensive uses such as in public transport such trains, planes, buses, pleasure boats.

The group or groups of diodes may be coupled to control means for emitting light either permanently or intermittently, with different intensities, or a given color, or different colors, in particular depending on the amount of natural light.

In a simple design, the section forming the reflector (3), in particular metal, comprises:

a so-called main part, in particular a metal part, elongated and oblique with respect to the rear face, comprising the main reflecting surface (30),

a so-called elongated upper part, in particular a metallic part, extending the main part, opposite the rear face, comprising the upper reflecting surface,

and the profile forming the reflector comprises a so-called lateral part, elongate, in particular a metallic part, extending the upper part, in particular plane and substantially normal to the rear face, and carrying diodes and preferably a first support of the diodes which is a card printed circuit board.

And in the latter mode, the first illuminating area being an illuminating strip with a first longitudinal edge and a second longitudinal edge, the vertical projection of the inner end of the main portion on the first face substantially corresponds to the first longitudinal edge of the strip. illuminating and even diffusing means, and preferably the width of the first illuminating strip is substantially equal to the width of the first diffusing means, and corresponds to the vertical projection on the glazing of the width between the lateral part and the main part.

The panel may comprise so-called masking means before the end of the main reflecting surface or even the lateral reflecting part, chosen from a reflecting layer forming a mirror, a diffusing layer, a decor layer, in particular colored, and preferably in particular of the same type as the first diffusing means or the first decorative zone. It suffices, for example, to make a first diffusing zone wider than the illuminating zone or a first decorative zone overflowing beneath the main part.

The first illuminating zone may be peripheral and the reflector surround all or part of the glazing unit by a lateral part carrying the diodes, and preferably comprise a return in contact with the main edge of the front face.

The panel according to the invention may comprise another group of diodes, another first illuminating zone in particular along an edge opposite or adjacent to the edge of the first selected peripheral illuminating zone.

The reflector can be in one piece thus serving for several illuminating areas, and even be carrying several groups of diodes extending along several or all edges of the glazing. The reflector is for example a monolithic piece, including a frame.

In one design of the invention, the first illuminating area is peripheral on a first edge of the front face, the panel comprises a second group of diodes and a second peripheral illuminating area on a second edge of the front face opposite to the first edge and provided with second diffusing means associated with the glazing, the reflector preferably comprises a central connecting part, facing the decorative zone, between a so-called main part of the reflector comprising the main reflecting surface and another so-called main part with a second reflecting surface main opposite the second group of diodes adapted to directly receive so-called central rays of said second group of diodes including the first main beam and return (by reflection) on the second diffusing means in an area between the diodes of the second group and the second main reflecting surface.

In another design of the invention, the decorative zone is peripheral and the first illuminating zone is more central, the panel comprises a frame surrounding all or part of the glazing and preferably having a return in contact with the edge of the front face. .

The first illuminating zone (includes a curved longitudinal edge, in particular a circle, and the main reflecting portion is also curved (in its length), in particular delimiting said curved longitudinal edge in (arc of) circle. for example device, and the first decorative area is a central circle or the opposite.

The panel according to the invention may comprise this single single glazing. With a single glazing, the panel according to the invention is simple, lightweight, easy to handle, to install and compact.

The first illuminating area covers a fraction of the surface (functional, visible) of the glazing, for example a zone (band ...) illuminating rather narrow in the case of a large glazed area.

In particular, the (maximum) width (constant or variable width) of the first illuminating zone (of any possible shape) may preferably be less than 200 mm or even less than or equal to 100 mm, in particular to leave an important decorative zone surface. .

The first illuminating zone may be peripheral, in particular along a panel edge and the more central decorative zone, then further from the diodes than the decorative zone.

The first illuminating area may be in a given area of the panel, which is for example a central area, and the decorative area may be more peripheral.

From a dimensional point of view, at least one of the following features can be provided:

the first illuminating zone (which is preferably the width of the first diffusing means) is of width less than 30% of the width of the glazing,

the vertical projection of the width of the reflector on the glazing is of width less than 30% of the width of the glazing,

the first illuminating zone is at least 50 mm long and in particular substantially equal to the length of the lateral or longitudinal edge of the corner glazing (square, rectangular, etc.),

the length of the reflector is equal to the length of the first diffusing means,

the length of the first support (PCB) is substantially equal to the length of the reflector,

the first support (PCB) is less than 1 cm thick or even 5 mm thick.

The first decorative zone (single or multiple, uniform or not) can be chosen from:

a reflective zone forming a mirror, by depositing a reflective coating on the glazing, in particular on the rear face, for example a silver coating, with preferably the first diffusing means formed by attacking the mirror,

and / or a translucent zone, satinized for example by texturing the glazing, and / or an opaque and / or colored zone, by an opaque and / or colored coating or by vitreous tinted glass.

A reflective surface for providing mirror function may usually be a silver-based layer. The mirror may be the SGG Miralite product from SAINT-GOBAIN GLASS, with an oxidation protection paint, or alternatively based on chromium such as the SGG Mirastar product from Saint-Gobain GLASS.

The glazing associated with the first diffusing means has a light transmission of less than 85%, preferably between 40 and 85%.

The diffusing means are preferably arranged in the thickness of the glass and / or on the rear face, they are thus protected and the front face preferably in contact with the external environment can be smooth and easily cleaned.

The first diffusing means may be more preferably associated with the rear face and for example the first diffusing means are formed by surface texturing of the glazing, in particular sandblasting, acidizing, abrasion or by adding a diffusing element, especially in a layer, preferably by screen printing an enamel or a diffusing layer or formed from a diffusing plastic material laminated with the glazing.

Acid etching, sandblasting, etching (advantageously by laser) or screen printing may be preferred because providing a delineation of the treated areas easily controllable and reproducible industrially.

Acidic glass includes SAINT-GOBAIN GLASS Satinovo® glass and SAINT-GOBAIN GLASS Smoothlite® diffusing glass.

The glazing (bare) can have a TL of at least 70%, or even at least 80%. The glazing can be made of clear or even extra-clear mineral glass. For extra-clear glass; reference WO04 / 025334 can be referred to for the composition of an extra-clear glass. In particular, it is possible to choose a silicosodocalcic glass with less than 0.05% Fe III or Fe ₂ O ₃ . For example, SAINT-GOBAIN's Diamant® glass, SAINT-GOBAIN's Diamant Solaire® glass, Saint-GOBAIN's Albarino® glass (textured or smooth), Pilkington's OptiWHITE® glass, Schott's B270® glass .

In addition, a mineral glass is preferred for glazing for its many advantages:

- The glass having good heat resistance, it may be close to the diodes despite the fact that they constitute hot spots, the glass is mechanically resistant so that it has an easy cleaning and is not scratched, which is of particular interest for panels installed in places imposing strict hygiene,

- glass meets the requirements of fire safety standards.

It may be as an example, depending in particular on the aesthetic rendering or the desired optical effect and / or the destination of the panel of:

glass of standard composition, such as Planilux® glass from Saint-Gobain Glass, with a slightly green color,

- extra-clear glass with no coloring (neutral) such as Diamant® and Soleil Solaire® glasses from SAINT-GOBAIN GLASS,

pyramidal type printed glass, such as Albarino® glass from the company SAINT-GOBAIN GLASS, pyramid-shaped reliefs being established on the external face of the substrate facing the external environment of the luminaire,

- tempered glass with improved mechanical strength,

- laminated glass with additional glazing by its front face, the first diffusing means can then be on the lamination interlayer or on or in the additional glazing

- tinted glass.

The panel according to the invention may include any other functional coating (anti-scratch, anti-soiling ...).

The lighting of the first illuminating area can be decorative, architectural, signaling or display.

The decorative and illuminating panel can be intended in particular:

- the building, as a ceiling lamp, wall tile; a partition,

- a transport vehicle, including public transport, train, metro, tramway, bus or water or air vehicle (plane),

- street or urban lighting,

- a window of street furniture, such as a bus shelter, a railing, a display, a window, a shelf element,

- a window of interior furniture, a bathroom wall, a piece of furniture. Other details and advantageous features of the invention appear on reading the examples of decorative and illuminating panels according to the invention illustrated by the following figures:

^■ Figure 1a shows a schematic cross-sectional view of a decorative panel and lighting emitting diodes 100 in a first embodiment of the invention;

^■ Figure 1 b is a partial schematic perspective view of the reflector profile and illuminating the decorative panel 100 of Figure 1a;

^■ Figure 1 c is a schematic top view of the decorative panel 100 and lighting of Figure 1;

^■ Figure 1d is a schematic rear view of another reflector section 3 integrated into a decorative panel and illuminating light emitting diode according to the invention;

^■ Figure 1 e is a partial schematic perspective view of the profiled reflector of Figure 1 d;

^■ Figure 1f is a schematic top view of a decorative and illuminating panel with the profiled reflector of Figure ^1e;

^■ Figure 2a shows a schematic cross-sectional view of a decorative panel and illuminating light emitting diode 200 in a second embodiment of the invention;

^■ Figure 2b is a schematic perspective view of the reflector profile and illuminating the decorative panel 200 of Figure 2a;

^■ Figure 2c is a schematic top view of the decorative panel and lighting 200 of Figure 2a;

^■ Figure 3a shows a schematic cross-sectional view of a decorative panel 300 and lighting emitting diodes in another embodiment of the invention;

^■ Figure 3b is a partial schematic perspective view of the reflector profile and illuminating the decorative panel 300 of Figure 1a;

^■ Figure 3c is a schematic top view of the decorative panel and lighting 300 of FIG 3a;

^■ Figures 4a to 4e show other examples of profiles reflectors.

It is specified that for the sake of clarity the various elements of the objects (including angles) represented are not necessarily reproduced on the scale. In Moreover, in the figures, the illuminating rays do not necessarily follow the laws of optics.

Figure 1 shows schematically a cross-sectional view of a decorative and illuminating LED panel 100 in a first embodiment of the invention.

The panel 100 comprises:

- A single glazing 1, flat mineral glass, for example a square or rectangular glass sheet, with a first main face 1 1 forming the rear face, and a second main face 12 forming the front face,

a first group of inorganic light-emitting diodes 2 (or LEDs) along a first longitudinal edge of the pane 100, arranged on the back side, diodes aligned and regularly distributed on a first elongate PCB support of diodes 20, strip,

a second group of inorganic light-emitting diodes 2 (or LEDs) along the second longitudinal edge of the pane 100, arranged on the side of the rear face, diodes aligned and regularly distributed on a second, elongate PCB diode support 20, of the strip type,

Each of the diodes 2 has a given emission spectrum in the visible, for example a white light, and with a main emission radius F, said first main ray, substantially parallel to the first face January 1.

For simplicity, the diodes of said group are chosen with the same (only) main direction of emission F. For uniform illumination, the diodes of the same group are chosen with the same spectrum, mono or polychromatic. The emission cone may be symmetrical or asymmetrical with respect to F. The emission cone may be, for example, lambertian. The beam of each diode is divergent and defined by a half-angle at mid-height of 60 °. The adjacent diode bundles of the first group overlapping on the surface of the first scattering means.

The diodes 2 are SMD type or "Chip on Board" type. The first and second PCB supports 20 are straight metal strips, in particular aluminum, and optionally with a diffusing surface (not shown) around the diodes 2 for ray recycling.

Each group of diodes 2 is arranged to create a peripheral lighting band 40, of given width and having throughout its width means of diffusion 4 of the light emitted by the diodes 2 associated with the glazing, said first diffusing means.

The first peripheral illuminating strip 40 associated with the first group of diodes is along the first longitudinal edge of the pane 100. Another first peripheral illuminating strip 40 is associated with the second group of diodes along the second longitudinal edge of the pane 100.

The first diffusing means 4 are able to modify the light transmission of the glazing 1 for example so that it is between 40 and 85%. The diffusing means 4 prevent too intense transmission of the illuminating rays emitted by the diodes, substantially reduce the glare of an individual looking towards the glazing 100.

The diffusing means 4 on the face 1 1 of the glass are obtained:

here by sanding, or acidification of the glass as realized for the SAINT-GOBAIN GLASS Satinovo® glass,

or alternatively by adding a diffusing layer made by screen printing an enamel or a diffusing layer such as made for Smoothlite® glass by SAINT-GOBAIN GLASS, the screen printing having the advantage of making it possible to obtain all type of design with well-defined boundaries, or alternatively in the thickness of the glass, by laser engraving.

In another variant, the diffusing means are constituted by the design of the diffusing intermediate plastic material when the glass 1 is laminated via a lamination interlayer to an additional glass.

The first two illuminating strips 40 are here rectilinear (as seen in FIG. 1c) each having a first longitudinal edge 41 and a second longitudinal edge 42.

Naturally, the first two illuminating strips 40 may be identical or distinct in their shape, their width, their color, their nature (different diffusion means, etc.).

The width of each first illuminating strip 40 is for example less than 200 mm or even 100 mm.

On the glazing 1, a central decorative area 60, preferably wider than the illuminating strips, separates the first illuminating strips 4. This is a reflective zone forming a mirror deposited on the rear face or a decorative zone colored or translucent. For each group of diodes 2, the panel 100 further comprises the side of the rear face 1 1, a first section forming a reflector 3 of the light coming from said first group of diodes (2), which is an elongate metal monolithic piece, comprising:

a main reflecting surface facing the group of diodes, oblique with respect to the rear face and able to directly receive so-called central beams of said first group of diodes including the first main beam F and to return them (by reflection) to the first diffusing means in an area between the diodes and the main reflective surface. a so-called upper reflective surface 32, joined to the main reflecting surface 30, facing the rear face 1 1 and able to receive directly so-called upper lateral spokes B of said first group of diodes deviating from the rear face 1 1 and to send them back,

on the first diffusing means 4,

- or on the main oblique reflecting surface (which will return them on the first diffusing means),

the extent of the main reflective surface 30 and the upper reflective surface 32 being such that at least 80%, upper side rays are reflected towards the first diffusing means 4.

The reflector 3 comprises a first reflection limit zone of the emitted rays

A, forming an angle α1 with the main direction of emission F, the extent of the first diffusing means 4 being such that the majority, or even at least 80%, so-called lateral radii lower than α1, and towards the rear face 1 1 are diffused by the first diffusing means 4.

In a simple manner, the reflective section 3 is made of metal, for example made of anodized aluminum, in particular of thickness less than or equal to 3 mm or even to 1 mm, which comprises:

a so-called main portion 30 which is elongate and oblique with respect to the rear face, comprising the main reflecting surface 30, forming an acute angle of 20 ° to 60 °, in particular 30 to 50 ° with respect to the rear face, extending until contact with the rear face 1 1 or until a maximum of a clearance of less than 5 mm with the rear face,

a so-called upper, elongate portion 32, extending the main part, opposite the rear face 11, comprising the upper reflecting surface 32. The profile forming a reflector 3 also comprises a so-called lateral portion 31 elongated, extending the upper portion 32 comprising the upper reflective surface, in particular flat and substantially normal to the rear face January 1, and carrier of the diodes 2 on their support PCB 20.

The diodes 2 are soldered on tracks which are electrically insulated from the metallic material of the PCB support 20. The metallic material of the support being heat conducting, the support could be directly pressed against the first thermal conductive base to obtain the heat dissipation. Fixing the support to the base can then be performed for example by clipping and / or screwing.

Here is interposed a thermal conductive fastening material 21 which is for example glue or double-sided adhesive tape to obtain even better heat dissipation.

The adhesive tape 21 has the advantage of providing a calibrated thickness, allowing the support 20 of the diodes 2 to be perfectly flat and to ensure that the diodes are all equidistant from the reflector. In addition, the adhesive tape allows its prior fixing to the support 20. It is also possible to use thermal grease between the support and the first base 30 such as the compound CK4960® sold by Jetart.

For each reflector section 3, it is preferred to add on the first face 1 1, (or alternatively on the second face or on an additional glazing unit associated with the second face) masking means 61, 62, said before, from the end of the main part 30, selected from a mirror reflecting layer, a diffusing zone, especially frosted glazing, a decor layer, including colored, and preferably including the same type as the first diffusing means or the decorative area.

For example, it is sufficient to extend the diffusing zone beyond the illuminating zone or that the decorative zone overflows below the main part.

The panel 100 is fixed to a wall 1 '(wall, ceiling, partition ...) for example by the side part forming an entourage of the panel with a return 33 on the front face.

Each reflector section 3 has a fixing surface to the wall 1 '(wall, ceiling, partition ...) by screws 5' arranged on the rear face of the upper reflecting part.

As an example of the dimensions of the different elements:

the surface of the glazing 1 is 600 × 600 mm and is an extra-clear glass 2.9 mm thick,

the distance between the wall 1 'and the glazing 1 is 28 mm, the width of each first illuminating strip is 40 mm and the length of each first illuminating strip 40 is 550 mm,

- the width of the central decorative zone is approximately 400 mm,

each support carries 30 diodes, is 10 mm wide, 550 mm long, of the order of 1.9 mm thick, and

the diodes, without optics, are of height of the order of 2 mm, of width less than 6 mm, with a regular distance between diodes 2 of 18 mm,

the distance between the diodes and the first scattering means is of the order of 15 mm,

the diodes have an individual power of 0.3W (approximately), an efficiency of at least 40 Im / W (lumens / Watt),

The illumination can be particularly illuminating with a total luminous efficiency of at least 40 Im / W and an optical efficiency (ratio between the total efficiency and the efficiency of a diode) (lumens / Watt) greater than 70%, while being homogeneous and very dazzling.

Efficiency is measured in the usual way using a goniometer and at room temperature. The thermal conduction property of the base, the support of the diodes, and means for securing the support to the base, generates a dissipation of the heat released by the LEDs, helping to guarantee the luminous efficiency.

We can thus form:

- in a building application, a ceiling lamp, a wall tile, a partition,

- a sign for a transport vehicle including public transport, train, metro, tramway, bus or aquatic or air vehicle (plane),

- street or urban lighting,

- a street furniture panel, such as a bus shelter, a balustrade, a display, a showcase,

- a shelf element,

- an interior upholstery panel, such as a bathroom wall, a piece of furniture.

The glazing can cover various shapes such as rectangular, square, round or any other geometric shape adapting to the desired design.

The glazing has a high light transmission of at least 85%. It may be as an example, depending in particular on the aesthetic rendering or the desired optical effect, and / or the destination of the glazing of: glass of standard composition, such as Planilux® glass from Saint-Gobain Glass, with a slightly green coloring;

- extra-clear glass with no coloring (neutral), such as Diamant® and Soleil Solaire® glasses from SAINT-GOBAIN GLASS;

- Pyramidal printed glass, such as Albarino® glass from the company

SAINT-GOBAIN GLASS, reliefs in the form of pyramids being established on the face opposite the external environment;

- tempered glass with better mechanical resistance. Figure 1d is a rear schematic view of another reflector profile 3 integrable into a decorative panel and illuminating LEDs according to the invention.

The decorative zone 60 is a round and the main reflecting portion 30 describes a ring. To form this reflective section can be used a metal sheet that is drilled in the center and that is bent and / or that is obtained by molding.

Figure 1 e is a partial schematic perspective view of the reflector section of Figure 1 d.

FIG. 1f is a schematic top view of a decorative and illuminating panel with the reflector profile of FIG. 1e showing the central decorative zone in the round and the peripheral illuminating zone 40.

Figure 2a shows a schematic cross-sectional view of a decorative and illuminating LED panel 200 in a second embodiment of the invention.

Only the differences with respect to the panel 100 are described.

The panel 200 differs from the panel 100 in particular in that the reflector preferably comprises a central connecting portion 34, facing the decorative zone 60.

The diffusing means 4 are made by adding a diffusing layer. The decorative zone is a colored layer 6 '.

Figure 2b is a schematic perspective view of the reflective section of the decorative and illuminating panel 200 of Figure 2a.

FIG. 2c is a schematic top view of the decorative and illuminating panel 200 of FIG. 2a showing the central decorative zone 40 and the peripheral illuminating zones 60 and the return of the reflector 33. Fig. 3a is a schematic cross-sectional view of a light-emitting diode LED decorative and decorative panel 300 in another embodiment of the invention.

Only the differences with respect to the panel 100 are described.

The panel 200 differs from the panel 100 in particular in that:

the illuminating zone is central and there are two peripheral decorative zones, involving the displacement of the profile in the center,

- the splitting of the profile (double flared cross section),

the addition of a peripheral frame 7 for fixing the glazing unit 1 to the wall 1 '.

Figure 3b is a partial schematic perspective view of the reflective section of the decorative and illuminating panel 300 of Figure 1a.

FIG. 3c is a schematic top view of the decorative and illuminating panel 300 of FIG. 3a showing the illuminating strip 40, the decorative strips 60 and the return of the frame 73.

FIGS. 4a to 4h show other examples of reflector sections with or without a carrier part of the diodes.

In FIG. 4a, the main part 30 has a spaced-apart end facing the rear face which is curved 30 'towards the direction opposite to the diodes 2.

In FIG. 4b, the upper reflecting plane portion 32 is reduced.

In FIG. 4c, the central reflecting plane portion 32 and the upper reflecting plane portion are of concave cross section.

In Figure 4d the central reflecting plane portion 32 is of concave cross section.

In Fig. 4e, the reflector is a triangular cross-section piece with a main reflective surface 30 and an upper planar reflective surface 32.

Claims

An electroluminescent light-emitting decorative and illuminating panel (100, 200, 300) that includes:

a glazing unit (1) with a first main face forming the front face (12), and a second main face forming the rear face (1 1),

at least one first decorative zone (60), in particular forming a mirror, visible on the front face,

at least one first group of light-emitting diodes (2), on the side of the rear face; the diodes having a given emission spectrum in the visible, each of the diodes (2, 2a, 2b) having a main emission radius (F1), said first main beam given,

at least one first illuminating zone (40), by the light coming from said first group of diodes (2), first visible zone on the front face (12), and adjacent to the first decorative zone (60), said first illuminating zone being provided with first diffusing means (4) associated with the glazing,

characterized in that the beam of each diode of the first emitted group is divergent and defined by a half-angle at mid-height of at least 30 °, the adjacent diode bundles of the first group overlapping on the surface of the first scattering means,

the diodes are arranged so that the first main ray (F) is substantially parallel to the glazing,

the panel comprises a profile (3) forming a reflector of the light coming from said first group of diodes (2), monolithic or in several parts preferably joined, and placed on the rear side, reflector comprising:

a main reflecting surface (30) facing the group of diodes, oblique with respect to the rear face and able to directly receive so-called central spokes of said first group of diodes including the first main beam (F) and to return them to the first diffusing means in an area between the diodes and the main reflective surface.

a so-called upper reflective surface (32), in particular joined to the main reflecting surface (30), facing the rear face (1 1) and able to directly receive so-called upper lateral radii (B) from said first group of diodes; away from the back side (1 1) and to send them back

on the first diffusing means (4), - or on the main oblique reflecting surface (which will return them on the first diffusing means),

the extent of the main reflective surface (30) and the upper reflective surface (32) being such that at least 80% of the upper side rays (B) are reflected towards the first diffusing means (4).

Decorative and illuminating panel (100, 200, 300) according to one of the preceding claims, characterized in that the reflector (3) comprises a first reflection reflection zone of the emitted rays (A) forming an angle oc1 with the main direction of the emission (F), the extent of the first diffusing means (4) being such that the majority, or even at least 80%, of said lower side radii beyond oc1, and towards the rear face (1 1) are diffused by the first diffusing means (4).

Decorative and illuminating panel (100, 200, 300) according to one of the preceding claims, characterized in that the main reflecting surface (30), oblique with respect to the rear face (1 1), forms an acute angle of 20 ° to 60 °, especially 30 to 50 ° with respect to the rear face.

Decorative and illuminating panel (100, 200, 300) according to one of the preceding claims, characterized in that the main reflecting surface (30) extends to contact with the rear face (1 1) or up to leave a maximum clearance of less than 5 mm with the back side.

Decorative and illuminating panel (100, 200, 300) according to one of the preceding claims, characterized in that the profile forming the reflector (3) is metallic, in particular of thickness less than or equal to 3 mm or even to 1 mm, and has:

a so-called main portion (30) elongate and oblique with respect to the rear face, comprising the main reflecting surface (30),

- An elongate said upper portion (32), extending the main part, facing the rear face (1 1), comprising the upper reflecting surface (32).

Decorative and illuminating panel according to the preceding claim characterized in that the main part (30) has an end spaced from the rear face and curved (30 ') towards the direction opposite to the diodes (2).

Decorative and illuminating panel (100, 200, 300) according to one of the preceding claims, characterized in that the diodes (2) of the first group are arranged on a part which is a preferably metallic profile (31), particularly in aluminum, copper or stainless steel, thus forming a first thermal conductor.

8. decorative and illuminating panel (100, 200, 300) according to one of the preceding claims, characterized in that the diodes (2) of the first group are on a first common support (20) elongated, the first support being a card printed circuit board preferably disposed on a preferably metal profile.

9. decorative and illuminating panel (100, 200, 300) according to the preceding claim, characterized in that the first support (20) is secured to a first thermal conductor of the metal type (31), in particular aluminum, copper or stainless steel, preferably formed by a portion of the reflector (31), said first support incorporating heat dissipation means (20) and / or being associated with heat dissipation means connected to the first thermal conductor (31).

10. Decorative and illuminating panel (100, 200, 300) according to the preceding claim, characterized in that the heat dissipation means (20) integrated and / or associated with the first support of the diodes are constituted by the material constituting the first support ( 20), of the metallic type, or by metal surfaces integrated in the first electrical insulating support, and possibly by means of securing (21) of the first support to said first thermal conductor (31), in particular formed by a portion of the reflector (3, 31), which are thermally conductive, of the type adhesive or thermally conductive adhesive tape and made of an electrically insulating material if the carrier is electrically insulating.

1 1. Decorative and illuminating panel (100, 200, 300) according to one of Claims 8 to 10, characterized in that the first support (30) of the diodes carries a diffusing free surface around the first group of diodes, in particular a lacquer or a paint .

12. Decorative and illuminating panel (100, 200, 300) according to one of the preceding claims characterized in that the profile forming the reflector (3), in particular metal, comprises:

a so-called main part (30), in particular a metal part, elongated and oblique with respect to the rear face, comprising the main reflecting surface (30), - a so-called upper (32) elongated part, in particular a metallic part, extending the main part, in view of the rear face (1 1), comprising the upper reflective surface (32), and the profile forming the reflector (3) comprises a so-called lateral part (31), elongate, in particular metallic, prolonging the upper part (32), in particular planar and substantially normal to the rear face (1 1), and carrier of the diodes ( 2) and preferably a first diode support (20) which is a printed circuit board.

13. Decorative and illuminating panel (100, 200, 300) according to the preceding claim, characterized in that the first illuminating area being an illuminating strip with a first longitudinal edge (41) and a second longitudinal edge, the vertical projection of the inner end of the main part (30) on the first face (1 1) substantially corresponds to the first longitudinal edge (41) of the illuminating strip (4) and even diffusing means, and preferably the width of the first illuminating strip ( 40) is substantially equal to the width of the first diffusing means (4), and corresponds to the vertical projection on the glazing (1) of the width between the lateral portion (32) and the main portion (30).

14. Decorative and illuminating panel (100, 200) according to any one of the preceding claims, characterized in that it comprises said masking means (61, 62) before the end of the main reflecting surface or even the lateral part, selected from a reflecting layer forming a mirror, a diffusing layer, a decor layer, in particular colored, and preferably in particular of the same type as the first diffusing means or the first decorative zone (60).

15. decorative and illuminating panel (100, 200) according to one of the preceding claims characterized in that the first illuminating area is peripheral and the reflector (3) surrounds all or part of the glazing by a lateral portion (31) carrying the diodes and preferably has a return (33) in contact with the main edge of the front face (12).

16. Decorative and illuminating panel (200) according to one of the preceding claims characterized in that the first illuminating region (40) is peripheral on a first edge of the front face (12), in that the panel comprises a second group of diodes (2 ') and a second peripheral illuminating area on a second edge of the front face opposite to the first edge and provided with second diffusing means (4') associated with the glazing, the reflector preferably comprises a central portion (34) of connection, opposite the decorative zone (60), between a so-called main part (31) of the reflector comprising the main reflecting surface and another so-called main part with a second main reflecting surface (30 ') facing the second group of diodes (2) able to directly receive so-called central radii of said second group of diodes including the first main ray (F) and return (by reflection) on the second diffusing means in a zone between the diodes of the second group and the second main reflecting surface.

17. decorative and illuminating panel (300) according to one of the preceding claims characterized in that the decorative zone (60) is peripheral and the first illuminating area (40) is central, the panel comprises a frame (7) surrounding all or part of the glazing (1) and preferably having a return (73) in contact with the edge of the front face (12).

18. Decorative and illuminating panel according to any one of the preceding claims, characterized in that the first illuminating area (40) comprises a curved longitudinal edge, in particular a circle, and the main reflecting portion (30) is also curved, in particular delimiting said curved longitudinal edge.

19. Decorative and illuminating panel (100, 200, 300) according to any one of the preceding claims, characterized in that the panel comprises this single single glazing.

20. Decorative and illuminating panel (100, 200, 300) according to any one of the preceding claims, characterized in that the first decorative zone (60) is chosen from:

a reflecting zone forming a mirror, produced by depositing a reflective coating on the glazing, in particular on the rear face, for example a silver coating, with preferably the first diffusing means formed by attacking the mirror,

and / or a translucent zone, satined for example by texturing of the glazing, and / or an opaque and / or colored zone, by an opaque and / or colored coating or by the tinted glass in the mass.

21. Decorative and illuminating panel (100, 200, 300) according to any one of the preceding claims, characterized in that the glazing (1) associated with the first diffusing means (4) has an illuminating transmission of less than 85%, preferably between 40 and 85%.

22. Decorative and illuminating panel (100, 200, 300) according to one of the preceding claims characterized in that the illumination of the first illuminating area is decorative, architectural, signaling.

23. Application of the decorative and illuminating panel (100, 200, 300) according to one of the preceding claims:

- the building including a ceiling lamp, a wall tile, a partition,

- a transport vehicle including public transport, train, metro, tramway, bus or aquatic or air vehicle (plane),

- street or urban lighting,

- a street furniture panel, such as a bus shelter, railing, display, showcase,

- to a shelf element,

- an interior furniture panel, such as a bathroom wall, a piece of furniture.