DE102011051038A1 - LED lighting arrangement e.g. pendulum lamp, for e.g. ceiling, has converting layer arranged between LEDs and aperture, where part of radiation emitted from layer radiates directly and without reflectance outward through aperture - Google Patents

Abstract

The arrangement i.e. elongated interior lamp (10), has a housing (12) with a light-emitting aperture, and LEDs designed as lamps, which radiate predominantly in blue and/or UV wavelength range. A phosphorus yttrium aluminum garnet cerium converting layer converts the radiated blue and/or UV light into white light, which is arranged at certain distance to the LEDs and invisible from outside within the housing. The layer is arranged between the LEDs and the aperture. A part of the radiation emitted from the layer radiates directly and without reflectance outward via the aperture.

Description

Technical area

• (a) ein Gehäuse mit zumindest einer Lichtaustrittsöffnung;
• (b) eine oder mehrere LEDs als Leuchtmittel, die überwiegend im blauen und/oder ultravioletten Wellenlängenbereich abstrahlen;
• (c) eine Phosphor-, YAG:Ce- oder andere konvertierende Schicht zur Konvertierung des abgestrahlten blauen und/oder ultravioletten Lichts in weißes Licht, die beabstandet zu den LEDs und von außen unsichtbar innerhalb des Gehäuses angeordnet ist.

The invention relates to a lighting arrangement comprising:

• (A) a housing having at least one light exit opening;
• (B) one or more LEDs as bulbs, which radiate predominantly in the blue and / or ultraviolet wavelength range;
• (c) a phosphor, YAG: Ce or other converting layer for converting the radiated blue and / or ultraviolet light into white light spaced from the LEDs and invisibly disposed externally within the housing.

State of the art

It is, for example, from the WO 2011/019753 Light-emitting diodes (LEDs) are known, which emit light in wavelengths, which is perceived by the eye as white light. These LEDs include a conventional LED that emits in the blue and / or ultraviolet wavelength range. The LED itself is provided with a phosphor layer. The phosphor layer converts at least a portion of the blue and / or ultraviolet light into light having a longer wavelength, for example yellow, green and / or red. The overall impression of the radiated light from all wavelengths is then white.

LEDs are very small and form a quasi punctiform light source. When using, for example, in an interior light therefore dazzle be provided to avoid glare. These may include a satined or microprismated plate which scatters the light. This creates the impression of a uniformly luminous plane. A disadvantage of the use of such anti-glare agents is that they absorb light in addition to the conversion process on the phosphor layer and thus suffers the efficiency of the luminaire.

The phosphor layer is in the immediate vicinity of the LED with white LEDs. It is therefore exposed to great heat and radiation. This speeds up the aging process. Also, the heat dissipation of the LED is hindered by the phosphor layer.

US 2007/0086184 A1 discloses the use of blue and UV LEDs whose light is converted to white light on a converting layer. The converting layer sits between two zones of translucent material for mixing and forwarding. The LEDs are used to illuminate, for example, displays.

EP 2 202 444 A1 discloses an arrangement with an LED whose light is directed directly into a curved phosphor layer by means of a curved mirror. The light reflected back from the phosphor layer in the direction of the LED is reflected by a further curved mirror in a limited angular range past the phosphor layer to the outside.

EP 2 146 133 A2 discloses a lamp with blue LEDs. The LEDs are arranged in front of or inside a cover which has an externally visible phosphor layer on the side opposite the LEDs. When switched off, the phosphor layer has a yellowish color and is unsightly.

US 2010/0259918 A1 discloses a luminaire in which an LED emits blue or ultraviolet light in the direction of a spaced apart phosphor layer. The light is converted to white light at the phosphor layer. The luminaire is provided on the inside of the luminaire housing with a diffusely reflecting layer. At this layer, the entire white light is reflected to the outside. The phosphor layer itself is masked and not visible from the outside. This completely blocks the direct light component. As with a anti-dazzle device, a high proportion of the light is absorbed at the diffusely reflecting layer or scattered in undesired directions so that it is no longer available for the actual application.

Disclosure of the invention

It is an object of the invention to provide an economical lighting arrangement with energy-efficient, blue LEDs, which has a good heat dissipation and emits glare, white light, without the converting layer is visible from the outside.

• (d) die konvertierende Schicht zwischen den LEDs und der Lichtaustrittsöffnung angeordnet ist; und
• (e) zumindest ein Teil der von der konvertierenden Schicht emittierten Strahlung direkt und ohne Reflexion durch die Lichtaustrittsöffnung nach außen abstrahlt.

According to the invention the object is achieved in that

• (D) the converting layer between the LEDs and the light exit opening is arranged; and
• (e) at least a portion of the radiation emitted by the converting layer radiates directly and without reflection through the light exit opening to the outside.

In the present invention, the continuous, converted light is used and not the light returned from the converting layer. The invention is based on the finding that the converting layer already has no Point light source is more and diffused. So there are no more diffuse reflectors or Entblendvorrichtungen longer required. Rather, in the arrangement according to the invention also imaging optics, crystal clear windows and reflectors can be used without additional glare. This minimizes light losses. The distance between the converting layer and the LED ensures that the converting layer does not hinder the heat dissipation of the LED nor that the converting layer is permanently affected by the heat of the LED. Since the converting layer is arranged within the housing, it is practically invisible from the outside even when the LED is switched off.

Preferably, a carrier arranged in the housing is provided with at least one receptacle for mounting the LEDs. The carrier may in particular have a receiving profile on both sides, which on one side of the carrier has a different geometry than the receiving profile on the other side of the carrier, wherein the carrier in the same housing facing both the one, and with the other side of the light exit opening can be mounted. The carrier may, for example, be provided with receptacles for a row of LEDs on one side and for two rows of LEDs on the other side. By turning the carrier, a different emission characteristic can then be achieved with the same components.

In a particularly preferred embodiment of the invention, the housing is elongated, wherein the housing and the carrier over the length have a substantially invariable cross-section and the LEDs are arranged in rows in the longitudinal direction of the housing. The housing and the carrier are then inexpensive to produce in different lengths of the same profiled goods. In particular, the housing is made of opaque material. A luminaire with an elongated housing can be combined with other, similar luminaires. The light exit surface may be provided on the underside and lie in a plane with the ceiling of an illuminated room.

The converting layer is preferably printed on a translucent plate, placed on a transparent plate as a film coated with a converting layer or coextruded with a carrier profile. In particular, the converting layer has an area which is substantially larger than the LEDs, so that the converting layer has a deblading effect.

The converting layer may be provided on a plate which is insertable with a holder in the housing. Preferably, the holder terminates the light exit opening with a translucent plate. With the holder, the housing is sealed against dust and other environmental influences. The holder holds the converting layer within the housing. Depending on the holder, the converting layer can be positioned differently with the same housing.

Preferably, the holder protrudes into the interior of the housing and has and at its ends a support for the LEDs and in its central region the plate with the converting layer.

Alternatively, a translucent, rounded hollow body with the converting layer can be attached to the support for the LEDs. Then, the converting layer is provided on the support for the LEDs and not directly on the holder.

In a particularly preferred embodiment of the invention reflectors are provided within the housing, which direct the outgoing of the converting layer, white light in a selected emission area. The reflectors can be formed imaging and must have no scattering effect.

In the present invention, the light exit opening is arranged on one side of the converting layer and at least one further light exit opening can be provided on the other side of the converting layer. Then, the light emitted by the converting layer in the direction of the LED is radiated past the latter through the additional light exit opening to the outside. In pendant or wall lights can be realized in this way without large absorption and reflection losses indirect lighting.

Embodiments of the invention are the subject of the dependent claims. Embodiments are explained below with reference to the accompanying drawings.

Brief description of the drawings

1 Figure 11 is an exploded perspective view of an elongate luminaire having a rotatable support for LEDs and a holder for holding a spaced apart phosphor layer within the housing.

2 is a cross section through the composite lamp 1 in a first variant, in which the phosphor layer is arranged on a plate arranged in the light exit opening.

3 is similar to a cross section through an alternative luminaire 2 wherein the phosphor layer is attached to a half cylinder on the support for the LEDs.

4 is similar to a cross section through another, alternative light 2 and 3 wherein the phosphor layer is attached to the holder in the middle region between the light exit opening and the support for the LEDs.

5 is similar to a cross section through another, alternative light 4 where curved reflectors are used.

6 is similar to a cross section through another, alternative light 4 in which light which is radiated upward from the phosphor layer in the direction of the LEDs exits through a further light exit opening.

7 shows a printed on a translucent plate phosphor layer.

8th shows a laid on a translucent plate sheet with a phosphor layer.

9 shows a phosphor layer as co-extrusion with a translucent carrier profile.

Description of the embodiments

1 is an exploded view of an elongated interior light, commonly with 10 is designated. The interior light can be designed as a pendant light. Alternatively, the interior light is mounted on the ceiling, integrated into the ceiling or attached to a wall as a wall lamp. The interior light can be used together with other, similar lights in the form of light strips or other structures.

The lamp 10 has a housing 12 on. At the top of a plate holder 18 is a carrier 14 intended. Above the carrier 14 is a driver use 16 intended. The housing 12 is open at the bottom and forms there a light exit opening. The light exit opening is with the plate holder 18 closed, in which a plate 20 is used. The plate 20 is made of glass and is covered with a phosphor layer 21 coated. The phosphor layer converts shorter wavelength light from the blue and ultraviolet wavelength ranges into light, which is perceived by the human eye as white light. In an alternative embodiment, the plate is made 20 made of plastic.

casing 12 , Carrier 14 and plate holder 18 have a cross section that is substantially the same length as the luminaire. As a result, these can be produced in virtually any length. The length can be well adapted to the particular needs of the application. The lamp 10 will be at their ends 24 and 26 finished with caps (not shown). The housing 12 consists in the present embodiment of a profiled aluminum U-piece. Depending on the environment and design, it can also be made of stainless steel or another durable material.

The carrier 14 It is also made of aluminum and forms a heat sink. The material has good thermal conductivity and is resistant to environmental influences. Several cooling fins extend along the carrier 14 over its entire length. This will increase the cooling performance of the wearer 14 elevated.

The plate holder 18 It is made of plastic and has a translucent surface 30 on. On the longitudinal sides in each case two V-shaped legs extend, which on the upper side of the surface 30 converge. The outer thighs 32 are shorter than the inner two thighs 34 , The outer thighs are slightly above the surface 30 out. With the outer thighs 32 becomes the plate holder 18 in the case 12 locked. For this are profiles 36 and 38 on the inside of the case 12 intended. The plate holder 18 sits in the assembled state so in the case that the bottom of the translucent surface 30 flush with the profile 38 at the bottom of the case 12 adjacent and thus forms a substantially flat conclusion.

The longer thighs 34 of the plate holder 18 are inwardly inclined towards each other. They serve as a holder for the wearer 14 , For this purpose, the ends of the legs 34 provided with a substantially T-shaped profile, in which a corresponding profile of the carrier 14 intervenes. The thigh 32 and 34 are something about their longitudinal axis 40 , where they are merged, movable. The plate holder 18 as a whole and the carrier 14 can therefore be clipped into position and need not be inserted from the ends. This shortens the installation time.

Between the inner thighs 34 lies the glass plate 20 with the phosphor layer 21 on the surface 30 on. The glass plate 20 with the phosphor layer 21 will be together with the plate holder 18 in the case 12 used. The plate holder 18 protects the glass plate 20 with the phosphor layer 21 from damage and contamination during installation. It is understood that instead of a glass plate 20 with the phosphor layer 21 Any other translucent, coated plate can be used which has the desired optical effect achieved. Thus, a microstructure or a satin-finished plate can be used and further reduce the visibility of the phosphor layer.

The inwardly facing surfaces of the legs 34 are reflective, for example, by vapor deposition with aluminum, applying a reflective film or, as shown here, by inserting a reflective disk 42 , Radiation from the interior of the lamp is through the reflectors thus formed down through the light exit opening 44 of the housing 12 reflected to the outside. This is in 2 good to see.

In the middle area between the top and the light exit opening 44 The housing forms two arms 46 and 48 extending over the length of the case 12 extend. The slightly bevelled, substantially vertical arms 46 and 48 are bent inwards at the free end, leaving horizontal ends 50 are formed. The driver insert 16 is with brackets 52 between these arms 46 and 48 held. This will be curved clip ends 54 over protrusions 56 on the arms 46 and 48 clipped. The driver insert 16 is essentially a sheet which is bent upwards at the ends. On this sheet are drivers 22 installed, which are required for the control and power supply of the LEDs described below.

The carrier 14 is a substantially flat structure. The cooling fins 28 jump on the in 2 down side. Between the cooling fins 28 is a rail 60 educated. The profiles along the long side of the carrier 14 , right and left in 2 , are so far symmetrically formed, as the carrier 14 both with the single rail 60 down - as in 2 shown - as well as up (not shown) at the T-shaped ends of the legs 34 can be used. This allows the factory to decide during assembly whether the single rail 60 should be arranged below or above. On the side, which is the side with the single rail 60 are two identical or comparable, parallel rails 68 and 70 intended. In 2 are the rails 68 and 70 arranged above.

Into the rails 60 . 68 and 70 can boards 72 be inserted with LED rows. The LED rows extend in the longitudinal direction of the entire arrangement on the boards. The boards 72 and so the LEDs will be with the drivers 22 contacted. Between the boards 72 and the carrier 14 At least during operation there is a good heat-conducting contact. In 2 is in the rail 60 a circuit board 72 inserted. arrows 74 . 76 and 78 illustrate the emission direction of the LEDs. LEDs are bulbs with a directional radiation characteristic in the range up to 180 degrees. It can be seen that in this arrangement, the essential part of the radiation directly down through the light exit opening with the translucent surface 30 arrives. Lateral portions of the radiated light are transmitted through the reflectors 42 without significant light losses also directed downward.

At the phosphor layer 21 hits the blue and / or UV light and is converted there into "white" light. By using LEDs with suitable wavelengths, the desired wavelength mix can be generated in this way. The phosphor layer 21 is set back slightly inside the case 12 , It is therefore not completely visible from the outside. The choice of material for the translucent surface 30 and / or the plate 20 and their design determines the appearance of the lamp in the region of the light exit opening, in particular when switched off.

3 shows a lamp according to an alternative embodiment. This lamp is the phosphor layer 121 inside of a semi-cylindrical glass substrate 120 applied. The plate 30 is crystal clear or has an appearance that is adapted to the environment in a selected way. The coated glass substrate 120 is with its ends in the vehicle 14 held. Incidentally, the lamp is identical to the light 2 ,

4 shows a lamp according to a further alternative embodiment. This lamp is the phosphor layer 221 as in the embodiment in 2 on a translucent surface 230 provided that is an integral part of the holder 18 forms. In the present embodiment, the area 230 but even deeper in the interior of the case 12 closer to the wearer 14 positioned. This reduces the angle range for observers who theoretically use the phosphor layer 221 could see.

The embodiments described above, in the 2 to 4 are shown have plane reflectors 42 inside on the thighs 34 of the owner 18 , With these reflectors 42 is reflected laterally emitted light down. 5 shows an embodiment in which instead of these flat reflectors curved reflectors 142 be used. This achieves a different lighting profile. In this illustration, a web of a grid for the longitudinal glare can be seen.

The embodiments described above, in the 2 to 5 are shown, have a housing 12 with only one light exit opening 44 , 6 shows an embodiment in which the housing 312 another Light opening 345 having. The area above the carrier is free. The drivers are housed elsewhere in the case. The holder 318 is translucent. In this way, light, which comes from the phosphor layer 321 inside the case 312 is radiated upward, unhindered on the carrier 14 past the light exit opening 345 exit to the top. This is through arrows 323 represents. The light emitted upwards can, for example, be used as indirect lighting for pendant luminaires.

The invention has been described above with reference to some concrete exemplary embodiments. However, the invention is not limited to these embodiments. A person skilled in the art will be familiar with a wide variety of possible variations, which result from the description and which likewise fall within the scope of protection, which is to be limited exclusively by the appended claims. It is understood that instead of a phosphor layer, any other converting layer can be used. Also, the invention is independent of the type of holder or the way the phosphor layer is applied. It can be applied to the plate in various ways, exemplified in the 7 to 9 are shown. 7 shows one on a translucent plate 20 printed phosphor layer 21 , 8th shows one on a translucent plate 420 applied foil 422 with a phosphor layer 421 , 9 shows a phosphor layer 521 as co-extrusion with a translucent carrier profile 520 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2011/019753 [0002]
• US 2007/0086184 A1 [0005]
• EP 2202444 A1 [0006]
• EP 2146133 A2 [0007]
• US 2010/0259918 A1 [0008]

Claims (11)

Lighting arrangement ( 10 ), comprising: (a) a housing having at least one light exit opening; (B) one or more LEDs as bulbs, which radiate predominantly in the blue and / or ultraviolet wavelength range; (c) a phosphor, YAG: Ce or other converting layer for converting the radiated blue and / or ultraviolet light into white light spaced from the LEDs and invisibly disposed externally within the housing; characterized in that (d) the converting layer is disposed between the LEDs and the light exit aperture; and (e) at least a portion of the radiation emitted by the converting layer radiates outwards directly and without reflection through the light exit opening. Lighting arrangement ( 10 ) according to claim 1, characterized by one in the housing ( 12 ) arranged carrier with at least one receptacle for mounting the LEDs. Lighting arrangement ( 10 ) according to claim 2, characterized in that the carrier ( 14 ) a receiving profile on both sides ( 60 . 68 . 70 ), which on one side of the carrier has a different geometry than the receiving profile on the other side of the carrier, and wherein the carrier ( 14 ) in the same housing ( 12 ) with one, as well as with the other side of the light exit opening ( 44 ) facing is mountable. Lighting arrangement ( 10 ) according to one of the preceding claims, characterized in that the housing ( 12 ) is elongated, wherein the housing ( 12 ) and the carrier ( 14 ) have a substantially invariable cross-section over the length and the LEDs in rows in the longitudinal direction of the housing ( 12 ) are arranged. Lighting arrangement according to one of the preceding claims, characterized in that the converting layer is printed on a translucent plate, placed as a phosphor-coated film on a translucent plate or co-extruded with a carrier profile. Lighting arrangement according to one of the preceding claims, characterized in that the converting layer is provided on a plate provided with a holder ( 18 ) in the housing ( 12 ) can be used. Lighting arrangement according to claim 6, characterized in that the holder terminates the light exit opening with a translucent plate. Lighting arrangement according to claim 6 or 7, characterized in that the holder projects into the interior of the housing and has at its ends a support for the LEDs and in its central region the plate with the converting layer. Lighting arrangement according to claim 2, characterized in that on the support for the LEDs and a translucent, rounded hollow body is attached to the converting layer. Lighting arrangement according to one of the preceding claims, characterized in that reflectors are provided within the housing, which direct the emanating from the converting layer white light in a selected emission area. Lighting arrangement according to one of the preceding claims, characterized in that the light exit opening is arranged on one side of the converting layer and at least one further light exit opening is provided on the other side of the converting layer.

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