EP3121512A1 - Light, in particular downlight and/or spotlight comprising a light source - Google Patents

Abstract

The invention relates to a luminaire having a light source (1) which has an LED arrangement (2) with a plurality of LEDs (2a) which define a light exit surface (3), wherein the light exit surface (3) has a central partial surface (3a ) and at least one further subarea (3b, 3c), each subarea (3a, 3b, 3c) is assigned a group of LEDs (2a) and the LED groups are each separately controllable or driven, the LEDs (2a) emit primarily radiation of the same color, wherein means are provided for light conversion, which have a carrier material and embedded in the substrate luminescent material or phosphor mixture, or which is formed to the primary radiation emitted at least partially in white or yellow or in green to convert red light, and an imaging optics is provided, which is designed and arranged such that the primary of the LEDs (2a) emitted radiation and the light converted by the means for light conversion is bundled or bundled by the imaging optics.

Description

The present invention relates to a luminaire, in particular downlight and / or spotlight luminaire with a light source.

Downlight and spotlight lights in the type in question are known in various embodiments and are regularly used for lighting sales rooms and in particular for illuminating the exhibited goods, such as textiles, books and food. Furthermore, they are used for general lighting of hotel areas, wellness areas, gyms, etc., in the office area for the lighting of meeting rooms, meeting rooms and corridors, in photography as well as in the TV and movie lighting and museum lighting.

Downlight lights are usually installed on a ceiling usually via corresponding ceiling rails and include a light source and an imaging optics with a reflector and / or a lens. Usually are equipped with downlight lamps, compact fluorescent lamps, halogen incandescent lamps or discharge lamps with different beam angle of 6 ° to about 60 ° as a light source.

Spotlight lights are rather articulated. Here rather small light sources such as halogen bulbs and small-Watt discharge lamps are used. In the table below, the properties are conventional used halogen incandescent lamps, compact fluorescent lamps and discharge lamps with the essential technical data, ie the color temperature of the emitted light, the power and the achievable luminous flux shown: Halogen bulbs / 2700K-3200K Compact fluorescent lamps 2700K or cold white discharge lamps Luminaire efficiency 6W / 150lm 5W / 300lm 10W / 900lm About 60-80% because of the large light sources and the self-absorption by the lamp bulb 12W / 300lm 7W / 420lm 20W / 1800lm 20W / 500lm 11W / 660lm 100W / 9.000lm 15W / 900lm 200W / 18.000lm 20W / 1,200lm

The well-known downlight and spotlight luminaires have proven themselves in practice. One problem, however, is that the life of the light sources used is comparatively low. For example, the lifetime of compact fluorescent lamps is in the range of 10,000 to 12,000 hours, of halogen lamps at 1,500 hours and of discharge lamps such as CDM or HCL lamps from 12,000 to 16,000 hours. Furthermore, it is considered disadvantageous that the luminous flux of the known light sources is generally not controllable and / or dimmable. In addition, the color rendering index Ra is over 88 for halogen incandescent and discharge lamps. For compact fluorescent lamps, on the other hand, the color rendering index Ra is only 80 to 83 with low color rendering for blue and red surface colors.

In addition, for a geometry and size of a given light source, the beam angle is fixed (for example, either 10 ° or 60 °). When the beam angle is to be changed, it is necessary to use a different imaging optics, ie other reflectors or lenses with different focal lengths.

Object of the present invention is therefore to provide a luminaire of the type mentioned in such a way that it is universally applicable. In particular, it should be possible to realize different beam angles without costly retooling with a lamp. It should be possible with the light different light fluxes. Different light intensity distributions (LVK curves) should also be possible without any problems.

This object is achieved according to the invention in a luminaire of the type mentioned above in that the light source has an LED arrangement with a plurality of LEDs defining a light exit surface, the light exit surface having a central part surface and at least one further ring surrounding the central part surface Partial surface, each subarea is associated with a group of LEDs and the LED groups are each controlled separately or are driven, the LEDs of all LED groups primarily radiation of the same color, in particular blue or ultraviolet radiation, preferably emit an identical spectrum, wherein Means are provided for light conversion, which comprise a carrier material and a phosphor embedded in the carrier material or a phosphor mixture embedded in the carrier material, which is or is formed to at least partially white radiation, in particular the primary radiation emitted dere warm white or neutral-cold white, or convert into yellow or green-red light, and an imaging optics with a reflector and / or at least one lens is provided, wherein the imaging optics is designed and arranged such that the LED of all LED Groups primarily emitted radiation and that with the means for Light conversion converted light through the imaging optics, in particular by a reflector of the imaging optics is bundled or bundled.

Warm white light, in particular, corresponds to similar color temperatures of 2200 to 3500 K and neutral cold white light of the most similar color temperatures of 3500 to 6500 K.

The invention is based initially on the consideration to use as the light source, an LED array with a plurality of LEDs, which define a light exit surface. Such LEDs have a long service life. Furthermore, with an LED arrangement, the luminous flux can be continuously dimmed between 0% and 100%, for example by current insulation or pulse width modulation (PWM).

The LEDs emit according to the invention all radiation of the same color, in particular all ultraviolet or, more preferably, blue radiation. Specifically, the emission of the LEDs is electromagnetic radiation whose spectral range visible to the eye is also referred to as light. Since the LEDs can in principle emit in the visible and / or in the non-visible spectral range, the general term radiation is used.

In an advantageous embodiment, the LEDs are all of identical design, so it is in particular the same semiconductor LEDs.

Means are also provided to at least partially convert the radiation primarily emitted by the LEDs into white, in particular warm white or neutral cold white, or yellow or green-red light. In this case, a phosphor or a phosphor mixture is used for the conversion used, which is embedded in a substrate and formed to allow the desired conversion of the particular blue radiation in white or yellow or green-red light. For example, a suitable phosphor or a suitable phosphor mixture can be used as the phosphor or phosphor mixture.

The carrier material, in which the light-converting phosphor or the light-converting phosphor mixture is embedded, may comprise or consist of, for example, plastic or ceramic or glass or epoxy resin or silicone. In this case, the phosphor can be embedded in the carrier material, in particular in the form of particles.

The carrier material is expediently transparent both for the radiation primarily emitted by the LEDs and for the light converted with the phosphor or phosphor mixture.

The inventively provided carrier material with the therein preferably embedded in the form of particles phosphor or phosphor mixture serves on the one hand to obtain from the primary emitted by the LEDs, especially blue radiation white or yellow or green-red light. Moreover, the primarily emitted radiation and the light are scattered in the carrier material, in particular on the phosphor particles provided therein. The emission characteristic of the surface from which the converted light emerges from the carrier material and radiates into the imaging optical system, in particular a reflector, is then in particular lambertsch.

It can be provided that the radiation primarily emitted by the LEDs is completely converted by means of the light conversion means. This is particularly useful when the means are adapted to the primarily to convert emitted light into colored light or white light. Alternatively, it may also be provided that the primary emitted light is not completely converted. This is expedient, for example, when the LEDs are primarily emitting blue light and the light conversion means are designed to partially convert the primarily emitted blue light into yellow light or into green-red light. In total, white light is then obtained from the converted yellow light or the converted green-red light and the unconverted blue light.

Furthermore, an imaging optics with a reflector and / or at least one lens is provided according to the invention. The imaging optics, which preferably has a defined focal length, is designed and arranged in such a way that the light emitted by the LEDs of all partial areas and the light converted by the means for the light conversion radiate into the imaging optics and can be brought onto a surface to be illuminated by them , In this case, the imaging optics in particular a light-bundling optical element with a predetermined focal length, such as a reflector or a lens that is configured and arranged so that by means of this emitted by the LEDs of all faces radiation and converted by the means for the light conversion Light can be bundled.

The imaging optics may be formed in a manner known per se in order to produce a desired light distribution curve.

In the luminaire according to the invention, the light exit surface, through which light or radiation emerges, divided into a central subarea, which is assigned to an LED group, and further subareas, which are also each associated with an LED group and which surround the central subarea in an annular manner , In principle it is sufficient if the central partial area only surrounded by a single annular partial surface. But it can also be provided a plurality of annular partial surfaces. In this case, the partial surfaces are preferably arranged concentrically to one another, wherein expediently the central partial surface is in the form of a full circle and the annular partial surfaces are correspondingly annular.

According to the invention, moreover, it is provided that the LED groups assigned to the partial surfaces can be controlled separately from one another. In this way, the possibility is opened to change the emission angle of the lamp according to the invention by activating only the LED group of one partial area or at the same time the LED groups of several partial areas. By switching on or off, the surface through which light radiates into the imaging optics provided according to the invention, in particular with a defined focal length, is changed, which in turn causes the emission angle with which the light emerges from the imaging optics to change.

If, for example, the LEDs of an outer subarea are deactivated, the size of the area through which converted light is radiated into the imaging optics is reduced, with the result that the emission angle is also reduced. The lowest beam angle is obtained when only the LEDs of the central subarea are turned on. Conversely, when the LEDs of one or more peripheral surfaces surrounding the central subarea are activated, the area from which light is emitted and thus the area over which light is irradiated into the imaging optics is increased, resulting in a larger beam angle.

If, for example, only the LED group of the central, in particular fully circular, partial surface is activated, a fixed radiation angle α of, for example, 6 ° or 10 ° is achieved. If the radiation angle is to be increased, the annular partial surface adjacent to the central subarea or additionally the LED group of an even further subarea is activated.

The design is in particular such that different light distribution curves can be set by changing the current intensity of the LEDs of one or more LED groups and / or by changing the PWM values of the LEDs of one or more LED groups. For example, a different current intensity can be set for the LEDs of the central subarea than for the LEDs of a further subarea which surrounds the central subarea in a ring shape, whereby a specific LVK is obtained. By means of a targeted choice of the current strengths or PWM ratios for the LEDs of the LED groups, it is possible to obtain LVKs of the desired shape.

The luminaire according to the invention offers various advantages. It is characterized by the use of LEDs through a long service life. The fact that only the same color LEDs, especially blue LEDs are used, the primary emitted radiation is converted according to the invention by suitable means in white or yellow or green-rotzes light, the structure of the lamp is also relatively simple and problems with which Different heat development different colored LEDs are accompanied, are completely avoided. The luminaire according to the invention also offers a high degree of flexibility, since the emission angle can be varied according to the invention by adding or removing the LEDs of individual partial areas. A change to an imaging optics with a different focal length is not required. Also different LVKs can be realized with the luminaire according to the invention via a different current or different PWM ratios of the partial areas in a simple manner. According to one embodiment of the invention, it is provided that at least some, in particular all LEDs are embedded in the carrier material containing the phosphor or the phosphor mixture, preferably with the carrier material.

For example, the LEDs can all be embedded, in particular embedded, in a common composite of the carrier material. Then all the LEDs in the common composite of the carrier material with the phosphor or phosphor mixture radiate. The joint composite represents a body of the carrier material in which all the LEDs are embedded and radiate into them.

Alternatively, the LEDs are embedded in groups in the substrate, i. All LEDs of a group are each embedded in a common carrier material composite and radiate in particular only in these. Accordingly, a body of the carrier material is provided for each LED group, in which the respective LEDs are embedded and irradiate.

The LEDs can also be individually embedded in the carrier material, in particular cast in, in which case a separate body of the carrier material is provided in particular for each LED, in which the respective LED is embedded and irradiated.

It can also be provided that the carrier material containing the phosphor or the phosphor mixture is formed in the form of at least one plate.

For example, exactly one plate can be provided, which is designed and arranged in front of the LEDs such that the radiation primarily emitted by the LEDs of all LED groups radiates into the plate. It can be provided in particular that the plate rests directly on the LED array or is arranged at a predetermined distance in front of the LED array.

Alternatively, a plate may also be arranged in front of each LED group. Then, in particular, the shape of each plate is adapted to the shape of the partial surface to which the LEDs of the associated LED group are assigned. This means that each plate is adapted in its shape to the subarea whose group of LEDs it is assigned. From the respective disk then all the LEDs of the assigned group can be covered, when the disk is arranged in front of the LEDs of the respective group and all the LEDs of the group radiate into the associated disk.

It can also be provided that a plate is arranged in front of each LED, wherein in particular the plate rests directly on the respective LED or is arranged at a predetermined distance in front of the respective LED.

If a plurality of plates are provided, these are in particular all arranged at the same distance in front of the LED arrangement or the LEDs of the latter or, in particular, all the plates are located directly on the LED arrangement or the LEDs.

The arrangement is in a preferred embodiment such that the radiation emitted primarily by the LEDs is irradiated on one side of the at least one plate and emerges on the opposite side of the plate converted light, optionally together with unconverted radiation from the at least one plate and radiates into the imaging optics. The one side of the at least one plate then defines a light exit surface for converted and possibly unconverted light or unconverted radiation.

Furthermore, it can be provided that the LED groups are separated from one another by separating elements, wherein the separating elements are impermeable, in particular for the radiation emitted primarily by the LEDs and the converted light, and the separating elements preferably extend along the outer circumference of the partial areas, wherein the height of the Separating elements particularly preferably exceeds the height of the LEDs. The separating elements can protrude, for example, from a printed circuit board on which the LEDs are arranged.

If the LEDs are cast into the carrier material, in particular the regions between the separating elements and the carrier material are preferably completely filled. The carrier material with the phosphor or phosphor mixture was then poured into the corresponding regions via the LEDs arranged in these, in particular up to a certain filling height, which may correspond to the height of the separating elements.

If the carrier material is designed in the form of at least one plate, the at least one plate can be held, for example, by means of the separating elements at a predetermined distance in front of the LED arrangement or the LEDs.

Furthermore, it can be provided that the LED arrangement comprises a printed circuit board having at least one recess whose depth exceeds the height of the LEDs, and the LEDs are arranged in the at least one recess, and the carrier material is cast into the at least one recess wherein the at least one recess is in particular completely filled with the carrier material. By the complete filling includes the phosphor or the phosphor mixture containing carrier material then flush with the open top of the at least one recess.

The LEDs can all be arranged in a recess. Alternatively, it is possible for the LEDs to be arranged in groups in each case in one depression, wherein each depression is then completely filled with carrier material which contains the phosphor or the phosphor mixture. Also, the circuit board for each LED have a recess which are completely filled with the carrier material with the phosphor or phosphor mixture.

Figur 1

eine erste Ausführungsform einer LED-Leuchte gemäß der vorliegenden Erfindung in schematischer Darstellung,

Figur 2

eine Aufsicht auf die LED-Anordnung der in Figur 1 dargestellten LED-Leuchte,

Figur 3

eine schematische Darstellung der Strahlführung durch eine Sammellinse für zwei unterschiedlich große lichtabstrahlende Flächen, und

Figur 4

eine zweite Ausführungsform einer LED-Leuchte gemäß der vorliegenden Erfindung in schematischer Darstellung.

Two exemplary embodiments of an LED luminaire according to the invention will be described in more detail below with reference to the drawings. In the drawing shows:

FIG. 1

a first embodiment of an LED lamp according to the present invention in a schematic representation,

FIG. 2

a top view of the LED arrangement of in FIG. 1 illustrated LED light,

FIG. 3

a schematic representation of the beam guide by a converging lens for two different sized light-emitting surfaces, and

FIG. 4

a second embodiment of an LED lamp according to the present invention in a schematic representation.

The FIG. 1 shows a first embodiment of an LED lamp according to the present invention in a schematic representation.

The luminaire is a downlight and / or spotlight luminaire with a light source 1, which comprises an LED arrangement 2 with a plurality of LEDs 2 a, which define a light exit surface 3. The light exit surface 3 is subdivided into a plurality of partial surfaces 3a, 3b, 3c and comprises a central, fully circular part surface 3a, and two further annular partial surfaces 3b, 3c, which are arranged concentrically to the central partial surface 3a and surrounding it. The partial surfaces 3a, 3b, 3c thus form a target-like arrangement. The LEDs 2a, which substantially fully equip the light exit surface 3, are subdivided into the subareas 3a, 3b, 3c associated LED groups which are each separately controllable or driven. For this purpose, the LED arrangement 2 comprises a corresponding control unit, which is not shown in detail.

The target-shaped arrangement of the three partial surfaces 3 a, 3 b, 3 c may also be the FIG. 2 are taken, which is a view of the LED assembly 2 of the lamp FIG. 1 contains in a schematic representation. In the FIG. 2 For example only a few of the LEDs 2a are shown. In concrete terms, a total of 12 LEDs 2a are shown, which belong to the group of LEDs assigned to the central subarea 3a.

All LEDs 2a are of identical construction. They emit all primary blue light of an identical spectrum. Specifically, the LEDs are designed to primarily emit light whose spectrum has an intensity peak with a wavelength of maximum intensity, in particular a central wavelength at 450 nm. Typically, the maximum intensity wavelength is between 435 and 465 nm.

The LED array 2 further comprises one in the FIG. 1 not shown, on which the LEDs 2 a are soldered. The LED groups are separated from one another by annular dividing elements 4a, 4b, 4c projecting from the printed circuit board, which extend along the outer circumference of the partial surfaces 3a, 3b, 3c and their height, as in FIG FIG. 1 recognizable, the height of the LEDs 2a exceeds. The annular separation elements 4a, 4b, 4c are not transparent to the light emitted primarily by the LEDs.

The luminaire further comprises means for completely converting the light primarily emitted by the LEDs 2a into white light. In this case, a phosphor or a mixture of phosphors is used for the conversion, which is embedded in a carrier material and designed to allow the conversion of the blue light into white light.

The carrier material consists of silicone, in which a phosphor mixture for the light conversion is embedded. The phosphor mixture is embedded in the form of phosphor particles in the silicone. The silicone is transparent to the light emitted primarily by the LEDs 2a and the phosphor converted by the phosphor mixture. The phosphor mixture used is a phosphor mixture which is designed to convert the blue light emitted primarily by the LEDs 2a into white light. The LEDs 2a of all three LED groups are cast in the same carrier material in which the same phosphor mixture is contained, so that white light of the same spectrum is obtained with each LED group.

The LEDs 2a are as in FIG. 1 recognizable in groups of the phosphor mixture containing carrier material. That is, all the LEDs of a group are each in a common, produced by casting the phosphor mixture containing carrier material carrier material composite, So body of substrate 5a, 5b, 5c embedded. The composite or body 5a, in which the LEDs 2a of the partial surface 3a are embedded, has a shape that is adapted to the central partial surface 3a. It thus has a circular shape, wherein it is bounded by the annular part 4a surrounding the central part 3a. The carrier material composite or body 5b, in which the LEDs of the partial surface 3b are embedded, is annular. The same applies to the carrier material composite or body 5c, which surrounds the LEDs of the partial surface 3c.

The LEDs 2a of each of the three LED groups emit light only in the carrier material composite 5a, 5b, 5c assigned to the respective group.

On the one hand, the blue light emitted by the LEDs 2a is converted into white light by means of the carrier material containing the phosphor mixture. The light is scattered at the phosphor particles provided in the carrier material. The emission characteristics of in FIG. 1 downwardly facing flat surfaces of the bodies 5a, 5b, 5c of support material from which the converted light exits the respective body 5a, 5b, 5c is lambertsch.

The luminaire according to the invention further comprises an imaging optic, which is formed in the illustrated embodiment by a reflector R with a defined focal length.

The LED arrangement 2, which comprises the LEDs blue-emitting in the substrate 2a, which projects into the carrier material, projects through an opening of the reflector R pointing upwards in FIG. The white light emitted primarily by all the LEDs 2a and converted by means of the phosphor mixture contained in the carrier material radiates during operation in the reflector R and can be bundled by means of this and placed on a surface to be illuminated.

The sub-areas 3a, 3b, 3c associated LED groups are also controlled separately. In this way, the possibility is opened up to change the emission angle of the light from the reflector R of the imaging optics by activating only the LED group of a partial surface 3a, 3b, 3c or at the same time the LED groups of a plurality of partial surfaces 3a, 3b, 3c. By switching on or off, the surface through which light is radiated into the reflector R is changed, which in turn causes the emission angle with which the light emerges from the reflector R of the imaging optics to change.

If, for example, the LEDs of one of the two outer partial surfaces 3b, 3c are deactivated, the size of the surface through which light is radiated into the imaging optics formed by the reflector R is reduced, which results in that the emission angle is also reduced. The lowest emission angle is obtained if only the LEDs of the central subarea 3a are turned on. Conversely, when the LEDs of one or both of the surrounding partial surface 3 a, 3 c surrounding the central subarea 3 a are activated, the area from which light is emitted and thus the surface through which light is radiated into the reflector R forming the imaging optics is increased which results in a larger viewing angle.

If, for example, only the LED group of the central subarea 3 a is activated, a fixed radiation angle α of 6 ° is achieved in the exemplary embodiment shown. In the reflector R, only light is then radiated, which of the subarea 3 a associated LEDs 2 a primarily emitted and with the carrier material composite 5 a, which is associated with the partial surface 3 a, is converted.

If the emission angle is to be increased, the annular partial surface 3b adjacent to the central partial surface 3a or additionally the LED group of the further outer partial surface 3c is activated. In the reflector R and light is then irradiated, which of the subfaces 3b and 3c associated LEDs 2a emitted primarily and with the carrier material composite 5b and the carrier material composite 5c, which are assigned to the respective surface 3b and 3c, is converted. The area over which light is radiated into the reflector R is then larger, resulting in a larger radiation angle results.

The underlying principle is in the FIG. 3 illustrated by the example of a lens as imaging optics. The FIG. 3 shows in the sectional view purely schematically a light-emitting surface 1, which is divided into a central, circular partial surface 1a and the central partial surface 1a surrounding annular partial surface 1b. Subordinate to the light-emitting surface 1 is a lens 2 of the focal length f, which is designed and arranged in such a way that light radiated from both partial surfaces 1a, 1b can be bundled by the lens 1. Centrally through the light-emitting surface 1 and the lens 2, the optical axis X.

In the FIG. 3 By way of example, the beam path for the uppermost point of the central subarea 1a in solid lines L ₁ and, by way of example, the beam path for the uppermost point of the further subarea 1 b surrounding the central subarea 1 a are shown in dashed lines L ₂ .

As is apparent from the schematic representation in FIG. 3 is apparent, in the case that light is emitted only from the central sub-area 1a, the radiation angle α for the light collected by means of the lens 2 is obtained. Will the light-abrading surface is increased, by light is emitted from the other part of the surface 1 b, however, one obtains the larger radiation angle β.

The Indian FIG. 3 shown purely schematically effect occurs in the lamp according to the invention, in which the sub-areas 3a, 3b, 3c associated LED groups are controlled separately, in the same way, in the illustrated embodiment, instead of a lens, a reflector R is used by the light emitted by all partial surfaces 3a, 3b, 3c can be collected. If, instead of a lens, a reflector is used in which the light emitted by the LEDs 2a of all partial areas radiates in, then the in FIG. 3 purely schematically illustrated principle alike.

By a different current flow or by setting different PWM ratios by means of the control unit for the three partial areas 3a, 3b, 3c, different LVKs can also be used with the luminaire according to the invention FIG. 1 will be realized.

The lamp according to the invention is characterized by the use of the LEDs 2a by a long service life. Characterized in that only the same color, present blue LEDs 2a are used, the primary emitted light is converted according to the invention with the phosphor mixture contained in the carrier material into white light, the structure of the lamp is also relatively simple. Problems that can be associated with a different heat development of differently colored LEDs are completely avoided. The luminaire according to the invention offers a high degree of flexibility, since the emission angle can be varied according to the invention by adding or removing the LEDs 2a of individual partial surfaces 3a, 3b, 3c. A change to an imaging optics with a different focal length is not required for this. Also, it is possible by setting Deviating flow or PWM ratios for the three sub-areas 3a, 3b, 3c to realize different LVKs with the lamp.

Alternative to the embodiment according to FIG. 1 in which the LEDs 2a are cast in groups in the carrier material with the phosphor mixture, can also be provided that the carrier material with the phosphor or phosphor mixture in the form of a plate in front of the LEDs 2a of the LED array 2 is arranged.

A corresponding second embodiment of the luminaire according to the invention is in the FIG. 4 shown. The light off FIG. 4 agrees with the in FIG. 1 shown lamp, with the only difference that the LEDs 2a in the light off FIG. 4 are not encapsulated with the carrier material, but this is arranged in the form of plates 6a, 6b, 6c in front of the LEDs 2a. The same reference numbers are used for the same components.

In the embodiment of FIG. 4 three plates 6a, 6b, 6c are concretely provided, one of which is assigned to one of the LED groups and thus one of the partial surfaces 3a, 3b, 3c. Each of the plates 6a, 6b, 6c is as in FIG FIG. 1 recognizable, arranged at a predetermined distance in front of the LEDs 2a of the respective group. The three plates 6a, 6b, 6c are made of ceramic as a carrier material, in which the same phosphor mixture is embedded in the form of particles, as in the carrier material of the lamp FIG. 1 , The phosphor mixture is accordingly designed to convert the blue light primarily emitted by the LEDs 2a into white light.

The shape of each plate 6a, 6b, 6c is adapted to the shape of that part surface 3a, 3b, 3c, before which it is arranged. Accordingly, the plate 6a is circular in front of the central part surface 3a, the plate 6b in front of the part surface 3b annular and the plate 6c in front of the outer part surface 3c likewise ring-shaped, the radii of the three plates 6a, 6b, 6c coinciding with the radii of the partial surfaces 3a, 3b, 3c.

The LEDs 2a of each of the three LED groups radiate light only to the respective LED group associated plate 6a, 6b, 6c.

The plates 6a, 6b, 6c are also well suited for the conversion according to the invention of the light primarily emitted by the LEDs 2a. A corresponding structure is particularly useful when a printed circuit board for LEDs 2a with good thermal conductivity is used.

Claims (15)

Luminaire, in particular downlight and / or spotlight luminaire with a light source (1), characterized in that the light source has an LED arrangement (2) with a plurality of LEDs (2a) which define a light exit surface (3), wherein the light exit surface (3) has a central subarea (3a) and at least one further subarea (3b, 3c) surrounding the central subarea, each subarea (3a, 3b, 3c) is assigned a group of LEDs (2a) and the LED groups are each controlled separately or are driven, wherein the LEDs (2a) of all LED groups primarily radiation of the same color, especially blue or ultraviolet radiation, preferably an identical spectrum emit, wherein means are provided for light conversion, which is a support material and a luminescent substance embedded in the carrier material or a luminescent substance mixture embedded in the carrier material, which is or are formed to form the pr imär radiation emitted at least partially in white, especially warm white or neutral cold white, or convert into yellow or green-red light, and an imaging optics with a reflector (R) and / or at least one lens is provided, wherein the imaging optics formed and arranged that the radiation emitted primarily by the LEDs (2a) of all LED groups and the light converted by the means for light conversion is bundled or bundled by the imaging optics, in particular by a reflector (R) of the imaging optics. Luminaire according to claim 1, characterized in that at least some, in particular all LEDs (2a) are embedded in the carrier material containing the phosphor or the phosphor mixture, preferably with the carrier material. Luminaire according to claim 2, characterized in that the LEDs (2a) embedded in groups in the phosphor or the phosphor mixture containing carrier material, preferably with the carrier material are cast. Luminaire according to claim 1, characterized in that the phosphor or the phosphor mixture containing carrier material in the form of at least one plate (6a, 6b, 6c) is formed. Luminaire according to claim 4, characterized in that exactly one plate is provided, which is designed and arranged in front of the LEDs (2a), that of the LEDs (2a) of all LED groups primarily emitted radiation radiates into the plate, in particular the plate rests directly on the LED arrangement (2) or is arranged at a predetermined distance in front of the LED arrangement (2). Luminaire according to claim 4, characterized in that in front of each LED group a plate (6a, 6b, 6c) is arranged, wherein in particular the shape of each plate (6a, 6b, 6c) to the shape of that part surface (3a, 3b, 3c ), to which the LEDs (2a) are assigned to the associated LED group, wherein preferably each plate (6a, 6b, 6c) rests directly on the LED arrangement (2) or at a predetermined distance in front of the LED arrangement ( 2) is arranged. Luminaire according to claim 4, characterized in that in front of each LED (2a) a plate is arranged, wherein in particular the plate rests directly on the respective LED (2a) or is arranged at a predetermined distance in front of the respective LED (2a). Luminaire according to one of the preceding claims, characterized in that the LED groups by separating elements (4a, 4b, 4c) are separated from each other, wherein the separating elements (4a, 4b, 4c) in particular for the primary of the LEDs (2a) emitted radiation and the converted light are opaque and the separating elements (4a, 4b, 4c) preferably extend along the outer periphery of the partial surfaces (3a, 3b, 3c), the height of the separating elements (4a, 4b, 4c) particularly preferably the height of the LEDs (2a). Luminaire according to one of the preceding claims, characterized in that the LED arrangement (2) comprises a printed circuit board having at least one recess whose depth exceeds the height of the LEDs (2a), and the LEDs (2a) in the at least one Well are arranged, and the carrier material is poured into the at least one recess, wherein the at least one recess is in particular completely filled with the carrier material. Luminaire according to one of the preceding claims, characterized in that the carrier material comprises plastic or ceramic or glass or epoxy resin or silicone, in particular made of plastic or ceramic or glass or epoxy resin or silicone. Luminaire according to one of the preceding claims, characterized in that the partial surfaces (3a, 3b, 3c) are arranged concentrically to one another. Luminaire according to one of the preceding claims, characterized in that the central partial surface (3a) is formed in a full circle. Luminaire according to claim 12, characterized in that the at least one, the central part surface annularly surrounding part surface (3b, 3c) is formed annularly. Luminaire according to one of the preceding claims, characterized in that the formation is made such that by switching on and / or switching off of one or more LED groups different beam angles can be realized. Luminaire according to one of the preceding claims, characterized in that the design is such that by changing the current from the LEDs (2a) one or more LED groups and / or by changing the PWM values of the LEDS (2a ) of one or more LED groups different light distribution curves are adjustable.

Images