EP1965976A1 - Led illumination means - Google Patents

Led illumination means

Info

Publication number
EP1965976A1
EP1965976A1 EP06841503A EP06841503A EP1965976A1 EP 1965976 A1 EP1965976 A1 EP 1965976A1 EP 06841503 A EP06841503 A EP 06841503A EP 06841503 A EP06841503 A EP 06841503A EP 1965976 A1 EP1965976 A1 EP 1965976A1
Authority
EP
European Patent Office
Prior art keywords
diodes
sheet
power
lighting according
means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06841503A
Other languages
German (de)
French (fr)
Inventor
Hugues Lefevre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Glass Europe SA
Original Assignee
AGC Glass Europe SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP05112512 priority Critical
Application filed by AGC Glass Europe SA filed Critical AGC Glass Europe SA
Priority to PCT/EP2006/070002 priority patent/WO2007071724A1/en
Priority to EP06841503A priority patent/EP1965976A1/en
Publication of EP1965976A1 publication Critical patent/EP1965976A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/1055Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer
    • B32B17/10761Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10009Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10165Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin particular functional features of the laminated glazing
    • B32B17/10174Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10165Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin particular functional features of the laminated glazing
    • B32B17/10174Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • B32B17/10183Coatings of a metallic or dielectric material on a constituent layer of glass or polymer being not continuous, e.g. in edge regions
    • B32B17/10192Coatings of a metallic or dielectric material on a constituent layer of glass or polymer being not continuous, e.g. in edge regions patterned in the form of columns or grids
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10165Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin particular functional features of the laminated glazing
    • B32B17/10541Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin particular functional features of the laminated glazing the laminated glazing acting as an illumination device, i.e. comprising a light source or a light guide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/01Dielectrics
    • H05K2201/0104Properties and characteristics in general
    • H05K2201/0108Transparent
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03Conductive materials
    • H05K2201/032Materials
    • H05K2201/0326Inorganic, non-metallic conductor, e.g. indium-tin oxide [ITO]
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007Types of components
    • H05K2201/10106Light emitting diode [LED]

Abstract

The present invention relates to illumination means in which the light output generator elements are light-emitting diodes. The diode illumination means according to the invention includes a laminated assembly consisting of at least one organic or inorganic glass sheet combined with at least one thermoplastic sheet incorporating the diodes. The individual power features of each diode, the operating conditions thereof and the diode distribution over the surface of the sheets are such that the generated light output is of at least 300 lm.

Description

Illumination means emitting diode

The present invention relates to lighting by means of light emitting diodes (LED).

The use of LEDs as light sources is still limited due to the implementation of features of these elements. Individually LEDs provide only a relatively low light output. Generally, the very limited spectrum of LED is also a factor that does not allow a color rendering satisfactory especially compared to that of incandescent lamps.

Nevertheless known cause of producing LEDs or LED groups, which allow to find a light whose spectrum is wide enough to provide a lighting giving good color rendering.

In all cases the LED lighting means need to gather a large number of units to reach the light powers that correspond to those obtained using in incandescent or discharge lamps, called fluorescence.

Despite the constraints mentioned above the use of LED lighting has a number of interesting features. Among them, the LED lifetime is especially notable compared to incandescent lamps. Another feature is the fact that LEDs dissipate little heat allowing use in conditions that make them inconvenient incandescent lamps. Another very desirable characteristic is the luminous efficiency, ie the amount of light produced by energy consumed. But the use of LEDs as the light source still offers many other advantages in terms of implementation convenience especially because of their very small size that permetentt implantation in locations that prohibit or make implementation difficult lamps filament or discharge.

Incandescent lamps, precisely because of the energy dissipated as heat, have a relatively low luminous efficiency that occurs between 12 to 20 lm / W. The fluorescent lamps have a much higher efficiency is between 50 and 80 lm / W. The corresponding characteristic of LEDs is in constant progress. It is located with current LED 15 to 60 lm / W and should quickly reach and exceed the level of fluorescent lamps. The estimation of the order of 80 to 100 lm / W at 5-year term is presented as the most likely.

These luminous efficiency values ​​are those corresponding to the actual diode with the protective envelope. The quality of the latter is an element that can alter the effectiveness due to insufficient light transmission. In the recent past the envelopes used led to a rapid decrease in efficiency due to a clouding that could reduce by 30% or more light transmittance after only a few hundred hours of operation. Envelopes including recently developed ceramics can prevent this loss of efficiency.

To achieve a sufficient power for lighting uses traditionally conducted by incandescent or fluorescent lamps, given the low power of each diode, it is necessary to associate the number of the same set. Among the means bringing these diodes, the most satisfactory are made of panels comprising at least one sheet of transparent material. In these panels the diodes are arranged in an arrangement that takes into account characteristics of both technical and aesthetic.

In all cases the diodes are normally arranged behind the sheet of transparent material which protects in avoiding exposure to mechanical hazards associated with traditional modes of use. The lighting means are particularly subject to regular cleanings. In the absence of this protective sheet diodes themselves or their attachments and connections might be deteriorated.

To form lighting assemblies conveniently be used it has been proposed in particular to arrange the diodes in a laminated assembly of the type comprising at least two sheets of transparent materials, including an inorganic or organic glass sheet, and a thermoplastic sheet wherein the diodes are incorporated. These sets further comprise a power supply circuit of the diodes usually in the form of one or more conductive layers disposed on the faces of the sheets constituting the laminated assembly. In this type of laminated assembly, the most common consists of a set comprising two rigid sheets associated with one or more thermoplastic sheets.

In practice when the light is directed from one side of the whole laminated -which is the case in particular lighting dipose on a ceiling or a wall of a Local transport the power supply circuit is preferably located behind the diodes with respect to the face from which emanates light. In this case the circuit can be opaque. Where appropriate the use of substantially transparent conductive layer makes it possible to dispose the diodes behind these conductive layers.

Achieving lighting means has yet to meet various conditions. The luminous flux must be sufficiently concentrated and powerful in particular to limit the size of these. In contrast the nature of the constituents of the laminate and the incorporation of the diodes in the thermoplastic nature of materials must take account of the dissipation of the heat generated by the diodes. This condition is all the more difficult as the dimensions of the diodes being very reduced heat their operation product is occasionally highly concentrated. Moreover the diodes being embedded in a low conductive medium, one of a thermoplastic sheet, the heat removal is made more difficult.

The optical characteristics of the materials used in these laminates also partly condition the transmission efficiency of the light flux generated by the diodes. It is necessary to adapt the diodes incorporation mode in these lighting means.

The invention provides means of illumination that take into account these requirements and others which will appear in the following description.

The illumination means according to the invention comprises a laminated assembly formed from at least one sheet of an organic or inorganic glass associated with at least one thermoplastic sheet wherein the diodes are incorporated. For this illumination means the choice of light-emitting diodes, in particular their power, their operating conditions, and also their distribution throughout the laminate are such that the generated luminous flux of at moins300 Im, preferably at least 500 Im, and particularly preferably is greater than 1000 Im.

For these light flux, the illumination means according to the invention together on a surface of limited size a large number of diodes. The conditions can also be reported directly to obtain the power of these lighting means. And the light flux relative to the surface of these means is at least 500 Im per square meter of surface of the illumination means. This power is chosen firstly to provide lighting means compatible dimensions with the most frequent uses and also to take account of what can be achieved by means of the characteristics of commercially available diodes.

This choice is also the result of a compromise between very dense distribution of diodes as the light output generated is as high as possible and the need to maintain the set temperature in conditions compatible with the holding of the constituent materials and also the best light efficiency of the other hand diodes. Depending in particular on the quality of diodes used and the materials constituting the laminated power assemblies can be at least 1000 lm / m 2, and preferably 2500 lm / m 2 and more.

For laminated sets the rise in temperature is a factor which limits the power point of each diode. The absorption of the heat generated by the operation of the diodes is relatively modest in materials traditionally used in the production of these sets. These include glass sheets which are known to be poor conductors of heat, it is also polymeric materials constituting the interlayers in which the diodes are housed.

In assemblies according to the invention advantageously implements the conventional infill materials such as polyacetals, especially polyvinyl butyrals (PVB), ethylene vinylacetate (EVA) or any similar material used in particular in the traditional way in laminated glazings . With these thermoplastic materials, the temperature in the vicinity of the diodes should preferably not exceed 80 0 C. It is advantageously less than 60 0 C.

It is all the more necessary to maintain the lowest possible temperature that the luminous efficiency of each diode decreases as the temperature rises. In other words the higher the temperature is high the greater the share of the energy given off as heat. This difference is extremely sensitive, so the luminous efficiency of the diodes can be reduced by more than 30% when the temperature of the diode from 50 0 C to 80 0 C.

Given the various characteristics of the diodes currently commercially available, particularly of the luminous efficacy, but also dimensions of these diodes that determine in part the heat exchange with the environment, namely the polymer sheet in which the diodes are housed it is advantageous to limit the operating power of each diode. In practice, it is best to ensure that the power dissipated by each diode does not exceed 2 W, and preferably not 1.5 W. Usually the operating power of each diode is maintained at less than 1 W most preferably less than 0.5 W.

The power rating of diodes used can be substantially greater than that of their use. It is possible for example to use diodes to half or less than their rated power. By operating the diodes at reduced power, it slows their "wear" but mostly we limit their heating. For this reason it may be necessary to use diodes 5 W or more. The choice of high power ratings determines the cost and volume of diodes. It is therefore necessary to choose the best compromise between power rating and the operation. Typically the operating power will not be less than a quarter and preferably one third of the nominal power. This operating power is also preferably at most by 4/5 th of the nominal power, preferably at most 3 A of this power.

The heating of the illumination means according to the invention not only comes from the diodes but also the power supply circuit thereof. When the lighting means in the form of panels offer a transparent face to the light emitted by all the LEDs it is possible to design power circuits where dissipation by Joule effect is very modest. Metal conductive circuits can indeed offer a very low resistance. When conversely the power supply is interposed in the path of the emitted light, and that this supply circuit must remain virtually invisible, in the case of transparent display panels, the power is typically obtained either by means very fine metal son taken in the laminate, or alternatively using conductive layers of very small thicknesses so as not to obstruct the light transmission. These layers are well known in the field of laminated glazing, in particular heated windows, have non-negligible resistance, and the more so that their thickness is smaller. Furthermore the Joule effect is more marked locally as the contact of the conductive layer with the conductors supplying each diode is less extensive, and consequently, in these conductors the electric current concentrates on a restricted surface of the diaper resulting in a relative increase in resistance.

To best reduce the Joule effect it is advantageous to power the LEDs under the highest possible voltage compatible with convenient operation. In domestic applications including one does not exceed preferably a voltage over 30Ov. Each LED operating voltage does not exceed typically 50 volts, and usually amounts to less than 25 volts. The arrangement of the LEDs in series can increase the supply voltages very significantly. The number of LEDs in series also affects the reliability of the entire series. If an LED fails the entire series is affected. To limit this risk of damage to the lighting means, one solution is for example to double each diode in parallel.

In all cases the nature and configuration of the circuit as well as the supply voltage are chosen so that the power dissipation by the Joule effect due to the supply circuit is as low as possible and preferably does not exceed 50% of the total energy, and preferably not greater than 30%.

In the case of the invention, when thin films constituting the power supply network of diodes, these layers advantageously offer the lowest resistance compatible with the highest light transmission possible. Within acceptable usual conditions optically, the light transmission layer is preferably greater than 90%.

Applied voltages suitable for sets of powered diodes, thin layers used preferably provide a resistance which is not greater than 30 Ω / [], and preferably not more than 20 Ω / Q.

When the means can not provide a transparent face, the other face is advantageously made of a good conductor of heat in order to facilitate the discharge thereof.

The face in question is advantageously formed of a metal sheet, and in this case is an element of the laminated assembly. In this case it is obvious that to minimize energy losses from the fuel system, it is constituted so as to minimize resistance. Transparency no longer imposed on the face having the metal sheet, the feed is advantageously made by means of conductors son.

Unable to remove particularly convenient way the heat generated due to the materials used in the structure of the illumination means according to the invention one tries to minimize this heat is used and for this the diodes provide good luminous efficiency. In practice taking into account the availability of the diodes is advantageously used whose luminous efficiency is not less than 20 lm / W, preferably greater than 30 lm / W. The extent of their commercial availability are preferred diodes whose efficiency is equal to or greater than 40 lm / W.

When maximizes luminous efficiency caused by the diodes must also be made to ensure that the structure of the lighting means, so that the laminate used to transmit the created better luminous flux. It is in particular necessary to ensure that the luminous flux is substantially available in its entirety for lighting. A part of this flow due to reflections that can develop within the laminate, can be trapped in this laminate. To prevent this part of the flow is significant efforts are made to limit the emission angle with respect to the normal to the interface between the organic or inorganic glass sheet and the surrounding atmosphere.

Traditionally, the diodes are provided with a reflective element in the form of a dish whose concave side is facing the diode. This construction allows not only to reflect the flow to only one face of the lighting means, but the flow is reduced to a beam aperture can thus be limited. This opening is advantageously such that the incidence of the light flux at the interface of the glass sheet with the outside is not greater than 60 angular degrees, preferably this effect is kept below 45 degree angle and better still less than

30 degrees.

The invention is described hereinafter in detail with reference to the drawings of sheets in which:

Figures Ia and Ib show in perspective a laminated assembly of lighting by means of diodes according to the invention;

Figure 2a shows in perspective the path of the light flux from a diode in a laminate of the type shown in Figure 1;

Figure 2b shows in section and in an enlarged manner the path of the luminous flux shown in 2a;

Figure 3 is a graph illustrating a typical distribution of luminous intensity as a function of the direction of the light flow with respect to the emission axis. Figure la shows in a partially "exploded" the components of the illumination means according to the invention. This form includes a transparent sheet 1 which is for example a sheet of glass that can be transparent or translucent if we want a diffused light effect. A thermoplastic sheet 2 transparent as the glass sheet itself is disposed between the sheet 1 and a series of three diodes for incorporation during assembly into the thermoplastic sheet 2.

In the embodiment shown the diodes 3 are uniformly distributed on a power supply circuit constituted for example by a thin conductive layer deposited on a second rigid sheet 5.

In an alternative form the diodes and the conductive layer or the conductive son feeding the diodes are arranged on a flexible sheet which replaces the sheet 5. The flexible sheet bearing the power supply circuit is for example a PET sheet.

The layer supplying the diodes is divided, for example by ablation following lines 4 between the conductive strips. The diodes are connected to two adjacent bands each connected to a power terminal.

In the embodiment shown the diodes are in parallel in row 6 and in series by 9. The diodes are relatively distant from each other so as to develop a relatively high luminance intensity despite that each offers that relatively low power typically of the order of 0.5 W or a little more. In the example 54 diodes are gathered in dimensions conditions eg 20x30 cm.

Also for the example considered, the assembly of the constituent elements shown in Ib. The laminated considered together the two sheets 1 and 5 through the interlayer sheet 2. The diodes are introduced into the interlayer sheet in the course of a typical training operation laminated glazing. For this the sheets are subjected to pressure after being heated to a softening temperature of the thermoplastic interlayer sheet 2.

In the realized assembly, are not shown the connectors feeding the conductive strips. These connectors, can be applied at the time of assembly, or subsequently thereto the two conducting strips at the ends.

In an embodiment obtained by combining two sheets of glass 3 mm thick, an intermediate PVB sheet of 0.76 mm and a set of 54 LEDs sold under the tradename Nishia Riguel white light is obtained a luminous flux of the about 500 Im equivalent to the flux of an incandescent lamp of 40 W. The flow per unit area thus amounted to about 8000 lm / m 2.

A set of the same kind formed from a panel of 50x50 cm, collecting 225 LED evenly distributed, develops a luminous flux of 2000 Im in the order corresponding to the flux of an incandescent lamp of more than 150 W.

Of course the dimensions and the number of LEDs can be increased depending on the desired flow, as long as the LED density conditions remains compatible with a local temperature rise that meet the specified conditions.

The driver circuit consists of a thin layer of tin oxide doped with antimony, deposited on the sheet 5. Its resistance is about 15 Ω / Q. In this configuration the highest temperature in the vicinity of the diodes is of the order of 50 0 C.

The issue of efficiency of the lighting means according to the invention according to its optical configuration is illustrated in the following figures. In these figures it is assumed light directed entirely through the sheet 1. This is the case for example lighting disposed on an opaque wall. In this case the diodes are selected advantageously with a reflector facing the sheet 1.

The radiation from the diode 3 incorporated into the interlayer sheet 2, passes through the latter and the transparent sheet 1.

According to incidence of the radiation relative to the normal to the face of the sheet 1 facing outwardly and the refractive index of the sheet 1, the rays are diffracted or reflected.

Figure 2b illustrates this feature for the case for example of a sheet 1 of glass in contact with the surrounding air.

The index of the glass of the order of 1.5, that the rays from the diode which are inclined (alpha) greater than about 60 degrees of angle with respect to the normal to the glass / air interface are reflected inward by successive reflections do not take part of the useful luminous flux for illumination.

The distribution of the luminous flux as a function of direction with respect to the normal to the glass sheet follows a curve type shown in Figure 3.

Claims

1. Token light emitting diode comprising a laminated assembly formed from at least one sheet of an organic or inorganic glass associated with at least one thermoplastic sheet wherein the diodes are incorporated, the individual characteristics of each power diode, their operating conditions, and the distribution of diodes on the surface of the sheets being such that the generated luminous flux of at least 300 Im.
2. Middle lighting according to claim 1 wherein the generated luminous flux of at least 500 Im
3. Token light emitting diode comprising a laminated assembly of a sheet of an organic or mineral glass associated with at least one thermoplastic sheet wherein the diodes are incorporated, the individual characteristics of each power diode, conditions of operation, and the distribution of diodes on the surface of the sheets being such that its power is at least 500 Im per square meter of surface of the illumination means.
4. Middle lighting according to claim 3 whose power is at least 1000 Im per square meter of surface of the illumination means.
5. Middle lighting according to claim 3 whose power is at least 2500 Im per square meter of the illumination means.
6. Means lighting according to one of the preceding claims wherein the individual characteristics of each power diode, the distribution of the diodes and the general configuration of the laminate are such that punctually continuous operation does not require a temperature for each diode local excess of 80 0 C.
7. Means lighting according to claim 6 wherein the individual characteristics of each power diode, the distribution of the diodes and the general configuration of the laminate are such that occasionally the operation does not require a diode for each local temperature exceeding 60 0 C.
8. Means lighting according to one of the preceding claims wherein the diodes are not used at greater than 2W individual power.
9. Means lighting according to claim 8 wherein the diodes are not operated above individual power 1.5 W.
10. Means lighting according to claim 8 wherein the diodes are not used at a higher individual capacity to 0.5 W.
11. Means lighting according to one of the preceding claims comprising a laminated assembly with two sheets of organic glass or mineral either side of one (or of) sheet (s) interlayer (s) thermoplastic (s) in which diodes are incorporated, the power supply of the diodes being performed through an electric circuit consisting of a substantially transparent conductive thin film, the resistance is such that the energy dissipation by the joule effect in the layer is less than 50% of the energy consumed.
12. Token lighting according to one of the preceding claims comprising a laminated assembly with two sheets of organic glass or mineral either side of one (or of) sheet (s) interlayer (s) thermoplastic (s) in which diodes are incorporated, the power supply of the diodes being performed through an electric circuit consisting of a substantially transparent conductive thin film, the resistance is at most 30 Ω / □.
13. Middle lighting device according to claim 12 wherein the power supply of the diodes is formed by means of an electric circuit consisting of a substantially transparent conductive thin film, the resistance is at most 20 Ω / D .
14. Token lighting according to one of claims 11 to 13 wherein the power supply of the diodes is formed by means of an electric circuit consisting of a substantially transparent conductive film whose light transmission is not less than 90%.
15. Token lighting according to one of the preceding claims wherein the light beam emitted by the diodes is directed so that its impact with the normal to the interface of the glass sheet with the atmosphere is not more than 60 angular degrees.
16. Middle lighting device according to claim 15 wherein the light beam emitted by the diodes is directed so that its impact with the normal to the interface of the glass sheet with the atmosphere is not more than 45 degrees angle.
17. Token lighting according to one of the preceding claims wherein the laminated assembly comprises in addition to the glass and the interleaf sheet in which diodes are incorporated, a high thermal conductive sheet including a metal foil.
18. Token lighting according to one of the preceding claims wherein the LEDs used have a luminous efficacy which is not less than 20 lm / W.
19. Middle lighting device according to claim 17 wherein the LEDs used have a luminous efficacy which is not less than 30 lm / W
EP06841503A 2005-12-20 2006-12-20 Led illumination means Withdrawn EP1965976A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05112512 2005-12-20
PCT/EP2006/070002 WO2007071724A1 (en) 2005-12-20 2006-12-20 Led illumination means
EP06841503A EP1965976A1 (en) 2005-12-20 2006-12-20 Led illumination means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06841503A EP1965976A1 (en) 2005-12-20 2006-12-20 Led illumination means

Publications (1)

Publication Number Publication Date
EP1965976A1 true EP1965976A1 (en) 2008-09-10

Family

ID=36423505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06841503A Withdrawn EP1965976A1 (en) 2005-12-20 2006-12-20 Led illumination means

Country Status (3)

Country Link
EP (1) EP1965976A1 (en)
EA (1) EA012477B1 (en)
WO (1) WO2007071724A1 (en)

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