EP3857122A1 - A light radiation source and corresponding assortment - Google Patents

A light radiation source and corresponding assortment

Info

Publication number
EP3857122A1
EP3857122A1 EP19779193.2A EP19779193A EP3857122A1 EP 3857122 A1 EP3857122 A1 EP 3857122A1 EP 19779193 A EP19779193 A EP 19779193A EP 3857122 A1 EP3857122 A1 EP 3857122A1
Authority
EP
European Patent Office
Prior art keywords
light radiation
generators
led light
cluster
pca
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.)
Granted
Application number
EP19779193.2A
Other languages
German (de)
French (fr)
Other versions
EP3857122B1 (en
Inventor
Alberto Alfier
Xiaolong Li
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.)
Osram GmbH
Osram SpA
Original Assignee
Osram GmbH
Osram SpA
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
Application filed by Osram GmbH, Osram SpA filed Critical Osram GmbH
Publication of EP3857122A1 publication Critical patent/EP3857122A1/en
Application granted granted Critical
Publication of EP3857122B1 publication Critical patent/EP3857122B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
    • F21Y2105/14—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements characterised by the overall shape of the two-dimensional [2D] array
    • F21Y2105/16—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements characterised by the overall shape of the two-dimensional [2D] array square or rectangular, e.g. for light panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the description relates to light radiation sources .
  • One or more embodiments may refer to light radiation sources using electrically-powered light radiation generators, such as solid-state light radiation generators, for example, LEDs.
  • electrically-powered light radiation generators such as solid-state light radiation generators, for example, LEDs.
  • arrays of light radiation generators with associated optical systems which may comprise, for example, lenses of various kinds such as plane-convex lenses, so-called “lenslets” to achieve a function of Koehler integration, spherical condensation lenses, zoom optics with movable lenses capable of achieving the required beam opening angles.
  • optical systems may comprise, for example, lenses of various kinds such as plane-convex lenses, so-called “lenslets” to achieve a function of Koehler integration, spherical condensation lenses, zoom optics with movable lenses capable of achieving the required beam opening angles.
  • light radiation generators for example, LED chips
  • This last aspect may prove to be critical for mixing light radiations coming from different colored sources in order to achieve a homogeneous resultant light radiation.
  • the presentation can be accessed of a white LED (Ultra-High CRI White LED) available under the trade name OptisolisTM from the company Nichia of 491 Oka, Kaminaka-Cho, Anan-Shi, TOKUSHIMA 774-8601, Japan, made with Chip-On-Board (COB) technology, and capable of emitting light radiation with a power in the order of about 70 watts, efficiency above 100 lm/W and a Color Rendering Index - CRI close to 100.
  • a white LED Ultra-High CRI White LED
  • COB Chip-On-Board
  • this light radiation source is a fixed light radiation source, without colored emission capacity.
  • the scalability according to the COB technology is obtained by adopting COB with different power levels and by scaling the projection optics .
  • light radiation sources having scalability characteristics, with limited characteristics regarding color mixing and flexibility of use (also due to the limitation of the range of colors available within the array of the light radiation source) .
  • One or more embodiments aim to provide the object of contributing to provide further improvements in producing light radiation sources with the ability to take into account the aspects outlined above.
  • this object can be achieved thanks to a light radiation source having the characteristics referred to in the following claims .
  • One or more embodiments may relate to a corresponding assortment of light radiation sources comprising light radiation sources with differentiated characteristics from each other, for example, "scaled” as a function of different current density values provided for their operation.
  • One or more embodiments may involve defining criteria for selecting and placing the light radiation generators included in the source, for example, in relation to the choice of the emission characteristics of the generators (for example, by using light radiation generators operating in the region of deep red) , with the ability to take into account factors such as, for example, the number of light radiation generators included in the light radiation source (for example, using twelve, sixteen or more light radiation generators) and/or defining rules for placing the individual generators within a group (cluster) so as to facilitate mixing the respective colors, for example, at the level of secondary optics.
  • One or more embodiments may facilitate achieving improvements in relation to several aspects which, in themselves, can also be seen as conflicting, such as, for example:
  • Figure 1 is a block diagram illustrating possible embodiments
  • reference 10 indicates - as a whole - a light radiation source using electrically- powered light radiation generators.
  • solid-state light radiation generators such as, for example, LED light radiation generators.
  • the source 10 may comprise a mounting substrate or support 12.
  • a planar substrate of materials such as, for example, aluminum nitride (AIN) or alumina (AL 2 O 3 ) or, in general, of ceramic or similar material that can exhibit heat dissipation characteristics.
  • the source 10 may comprise a plurality of single light radiation generators applied onto the substrate 12, optionally in the absence of a superimposed covering such as, for example, a lamina or dome of glassy material.
  • such a covering may, however, be provided, at least as a temporary covering ("sacrificial") , which can be used during production of the light radiation source 10, and can then be removed or eliminated.
  • the individual light radiation generators can be made according to known technologies, for example, by resorting to technologies used to make light radiation generators (white light and/or colored light) currently available at the applicant companies.
  • a function of adjusting the emitted light intensity can be carried out, for example, by supplying the light radiation generators with a pulse-width modulation signal, the duty cycle of which is selectively varied, or with other solutions known to those skilled in the art.
  • One or more embodiments may envisage that within the array of light radiation generators of the source 10, there is a group or cluster formed by a certain number of light radiation generators (for example, twelve) arranged according to a general cross-shaped configuration.
  • the term "within” intends to highlight the fact (as exemplified in Figure 6, which will be discussed later) that the array of light radiation generators of the source 10 may comprise further generators in addition to those of the group or cluster.
  • the cruciform arrangement of the aforesaid cluster may comprise a central portion or region 14 (comprising four generators) surrounded by a peripheral portion or region 16 comprising, in the example considered, eight light radiation generators, to make a total of twelve generators .
  • the peripheral portion or region 16 may comprise four pairs of generators with each pair located at one of the sides of the central region or portion 14, or rather, a pair at the top, a pair at the bottom, a pair on the left and a pair on the right.
  • One or more embodiments may, in fact, envisage variations in one or more of the characteristics considered above.
  • the cluster may have a rounded shape with, for example, a central region or portion 14 of circular shape comprising light radiation generators shaped like a circular sector (i.e. a segment), and the peripheral region or portion 16 comprising light radiation generators shaped as a circular crown segment;
  • the various generators may have different shapes (think, for example, of the sector shapes and circular crown segment mentioned above) and/or different dimensions, being able, for example, to play on factors such as the radial dimension of light radiation generators formed as a sector or a circular crown segment and/or on the angular extension of these sectors or segments to modify these dimensions.
  • the shape and size of the various generators are therefore variables that can come into play in defining the characteristics of embodiments, since it is possible, for example, to use generators or chips (e.g. squares) of different sizes and/or use chips with different shapes (e.g. hexagonal, segment-shaped, etc.)
  • One or more embodiments may relate to the selection of colors (i.e. of the emission wavelength ranges) of the various generators and/or the location of the generators within the cluster 14, 16.
  • one or more embodiments may envisage using, within a cluster comprising twelve light radiation generators, as exemplified in the figures, light radiation generators of six or seven different "chromatic" types, that is, such as to emit light radiation in seven ( Figures 1 to 4 and 6) or six ( Figure 5) different emission wavelength ranges.
  • light radiation generators can be used - known per se, as already mentioned - comprising (referring to the case in which light radiation generators of seven different chromatic types are used) :
  • RB a blue emission LED light radiation generator, indicated with RB in the figures, which emits blue light (royal blue) in the range of 443 nm to 468 nm, optionally around 450 nm;
  • a cyan emission LED light radiation generator indicated with CY in the figures, which emits cyan light in the range of 495 nm to 510 nm, optionally around 505 nm;
  • an aquamarine emission LED light radiation generator indicated with AQ in the figures, which emits aquamarine light in the range of 475 nm to 495 nm, optionally around 485 nm;
  • GR green emission LED light radiation generator
  • a deep red emission LED light radiation generator indicated with DR in the figures, which emits deep red in the range of 638 nm to 660 nm, optionally around 650 nm;
  • a lime emission LED light radiation generator indicated with PCL in the figures, which emits lime light in the range of 560 nm to 580 nm, optionally around 570 nm;
  • amber emission LED light radiation generator indicated with PCA in the figures, which emits amber light in the range of 580 nm to 600 nm, optionally around 590 nm;
  • the blue, cyan, aquamarine, green and (deep) red light radiation generators can be produced by means of direct emission LED generators, while the lime and amber color generators can be produced by means of phosphor- converted LED generators .
  • One or more embodiments may envisage choosing the number of the various generators (in short, “chips”) comprised in the cluster 14, 16 according to a criterion of expressible proportionality (always referring to the case in which light radiation generators of seven different color types are used) in the following form.
  • the proportionality ratio can be expressed in the following terms:
  • the driving current density
  • the driving current density
  • One or more embodiments may envisage that the distribution of the light radiation generators in the cluster 14, 16 follows (with reference to the example presented here with four generators in the central zone or region 14 and eight generators in the outer zone or region 16) application of guidelines of the type:
  • Applying these guiding criteria can be tempered, in one or more embodiments, by applying additional redistribution criteria aimed at further improving the mixing effect of the various colors.
  • these additional criteria may envisage - in the presence of chips placed in the outer region or portion 16 (respectively, inner 14) and such as to emit light radiation in emission ranges close to each other - at least one of these colors close together can be located in the inner region or portion 14 (respectively, outer 16) .
  • at least one of the light radiation generators in the set is arranged in either (14, resp. 16) said central region 14 or said peripheral region 16, and the other light radiation generator (s) in the set is/are arranged in the other (16, resp. 14) of said central region 14 or said peripheral region 16.
  • chips can be considered such as to emit light radiation in emission ranges close to each other, which emit red, amber and lime color radiation, respectively, or chips that emit blue, cyan and aquamarine color radiation, respectively.
  • One or more embodiments may envisage the redefinition of the specific rules as a function of a different number of chips.
  • one or more embodiments may envisage the use of at least one chip that emits in the region of deep red. It has been verified that this choice allows, for example, within combinations of six or seven colors as exemplified here, obtainment of an overall emission that approximates the emission of a traditional tungsten lamp until it can actually be considered as coincident by a not particularly experienced observer.
  • Figure 2 exemplifies, for direct comparison with Figure 1, the possibility of producing - adopting the same criteria exemplified above - a light radiation source 10 with a different arrangement of the chips with respect to that exemplified in Figure 1.
  • Figures 3 and 4 exemplify the possibility, for example, if light radiation generators capable of sustaining higher current levels (for example, a current in the order of 3 A/mm 2 , in practice at least twice the current density of 1-1.5 A/mm 2 considered previously) are used, for example, to reduce the number of generators that emit amber-colored light radiation in favor of generators (in themselves less efficient) that emit in the deep red region
  • One or more embodiments may thus envisage the possibility to "scale” the number of chips to vary the current density.
  • Embodiments as exemplified in Figures 1 to 4 envisage the presence - in the cluster 14, 16 - of (for example, twelve) light radiation generators operating in seven respective wavelength emission ranges, different from each other (i.e. RB, CY, AQ, GR, DR, PCL, PCA) .
  • One or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in a number of different respective emission wavelength ranges, greater than or less than seven.
  • one or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in a number of different respective emission wavelength ranges equal to at least five .
  • one or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in five different respective emission wavelength ranges: e.g. red (DR), green (GR) , blu (RB) , amber (PCA) and lime (PCL) .
  • DR red
  • GR green
  • RB blu
  • PCA amber
  • PCL lime
  • one or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in six different respective emission wavelength ranges: e.g. red (DR), green (GR) , blu (RB) , amber (PCA) and lime (PCL) , and aquamarine (AQ) .
  • DR red
  • GR green
  • RB blu
  • PCA amber
  • PCL lime
  • AQ aquamarine
  • Figure 5 exemplifies, in fact, embodiments in which the use of light radiation generators operating in six different respective emission wavelength ranges is envisaged: e.g. red (DR - three generators), green (GR - one generator) , blue (RB - one generator) , amber (PCA - four generators), lime (PCL - two generators) and aquamarine (AQ - one generator) , thus without the provision of a generator operating in the cyan (CY) range, "replaced” by a generator operating in the red (DR) range.
  • red red
  • GR - one generator green
  • RB - one generator blue
  • PCA - four generators amber
  • lime PCL - two generators
  • aquamarine AQ - one generator
  • the cluster 14, 16 comprises both direct- emitting LED light radiation generators (RB, AQ, GR, DR) and phosphor-converted LED light radiation generators (PCL, PCA) ,
  • the number of LED light radiation generators in the cluster 14, 16 is greater than the number of the different emission wavelength ranges (equal to six) .
  • first LED light radiation generators (RB, AQ, GR) are present, with each of said first LED light radiation generators being the only one in the cluster to emit light radiation at a certain emission wavelength range, and
  • each of these second LED light radiation generators having at least one homologous second LED light radiation generator in the cluster that emits light radiation at a respective common emission wavelength range.
  • Figure 6 exemplifies the possibility, in one or more embodiments, to integrate the "cluster" 14, 16 (comprising twelve generators in the embodiment presented here, which is such) in an array which, in addition to this cluster, comprises additional generators, for example, four additional generators (with an overall number of generators which then becomes equal to sixteen) , with these additional generators comprising, for example, four generators of deep red color DR.
  • One or more embodiments may envisage the further increase of the number of light radiation generators, correspondingly increasing the overall dimensions of the device, for example, by allocating twenty-five generators instead of twelve, that is, in practice, doubling the structure exemplified here.
  • the source 10 can be provided with a covering, for example, of glassy material.
  • this can be a "sacrificial" cover used during assembly of the source 10 and intended to be removed or eliminated at the end of the assembly operation.
  • This cover can be and/or become a stable cover intended to protect the generators during use of the source 10.
  • light radiation sources 10 available in an assortment of different variants with at least partially different chromatic characteristics for the various sources included in the assortment.
  • one of the cyan or aquamarine chips can be replaced with another generator, for example, lime, amber or red.
  • One or more embodiments may envisage delivering a material 20 impermeable to light radiation (T1O2) so as to reduce possible leakage between adjacent generators, for example, (as exemplified by dashed lines in Figure 1 only) at the generators operating by means of phosphor conversion (amber PCA and lime PCL, in the example considered) .
  • T1O2 impermeable to light radiation
  • the Color Rendering Index is a parameter used to describe how faithfully the light sources render the color of the objects they illuminate, calculated by comparing the appearance of eight reference colors (from R1 to R8) . It is also possible to consider a more saturated color reference, known as R9 (red) , with a high value R9, indicative of a better chromatic rendering for various applications.
  • one or more embodiments facilitate the use of dimming techniques in order to provide a High Color Rendering - HCR.
  • a light radiation source (e.g. 10), as exemplified here, may therefore comprise an array of LED light radiation generators arranged on a substrate (e.g. 12), the array comprising a cluster (e.g. 14, 16) of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) , configured to emit light radiation at different emission wavelength ranges.
  • a substrate e.g. 12
  • the array comprising a cluster (e.g. 14, 16) of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) , configured to emit light radiation at different emission wavelength ranges.
  • the cluster (e.g. 14, 16) of LED light radiation generators may comprise both direct-emitting LED light radiation generators (e.g. RB, CY, AQ, GR, DR) and phosphor-converted LED light radiation generators (e.g. PCL, PCA) ,
  • the LED light radiation generators in the cluster are individually controllable (e.g. by means of the controller C) to vary the intensity of the light radiation emitted thereby,
  • the number of LED light radiation generators in the cluster (e.g. twelve) is greater than the number of said different emission wavelength ranges (e.g. at least five, optionally six - see Figure 5 - or seven - see Figures 1 to 4),
  • the cluster of LED light radiation generators may include:
  • first LED light radiation generators (RB, CY, AQ, GR) , each of said first LED light radiation generators being the only one in the cluster (14, 16) to emit light radiation at a certain emission wavelength range, and
  • second LED light radiation generators e.g. DR, PCL, PCA
  • each of said second LED light radiation generators having at least one homologous second LED light radiation generator in the cluster (or rather, at least one "twin" generator) that emits light radiation at a respective common emission wavelength range.
  • the cluster of LED light radiation generators may comprise a central region (e.g. 14) and a peripheral region (e.g. 16) around the central region, with:
  • said first LED light radiation generators (RB, CY, AQ, GR) that can be arranged in said central region (see, for example, Figures 1 to 4, where at least two of the first four generators, i.e. AQ, CY or AQ, RB are in the region 14), and/or
  • said second LED light radiation generators e.g. DR, PCL, PCA
  • said peripheral region see, e.g., all Figures 1 to 6, with the PCL and PCA generators in Figures 1, 2, 5 and 6, the generators PCA and DR in
  • FIG 3 or again the generators PCL and DR in Figure 4, which are six out of eight among the generators in the peripheral region 16 and/or with the majority of the second generators DR, PCL, PCA arranged in the peripheral region 16) .
  • the emission wavelength ranges of said first LED light radiation generators may constitute the majority of the emission wavelength ranges emitted at said central region (see, for example, Figures 1 to 4 where two out of three of the emission wavelength ranges emitted at the central region 14 are emitted by generators selected from the first generators of light radiation LED (e.g. RB, CY, AQ, GR) .
  • the cluster of LED light radiation generators may comprise a central region (e.g. 14) and a peripheral region (e.g. 16) around the central region, and wherein:
  • said second LED light radiation generators are arranged at said peripheral region in the absence of homologous second LED light radiation generators arranged adjacent to each other, and/or
  • At least one of the light radiation generators in the set is located in either (14, resp. 16) said central region (14) or said peripheral region (16) and the other light radiation generator (s) in the set is/are arranged in the other (16, resp. 14) of said central region (14) or said peripheral region (16) .
  • the substrate e.g. 12
  • the substrate may comprise ceramic material and/or
  • the light radiation generators can be arranged on the substrate in the absence of a cover left in place to cover the light radiation generators (for example, a sacrificial cover can be provided, intended to be used during the mounting of the source, and then removed or eliminated), and/or
  • light-impermeable material e.g. 20
  • a light radiation source (e.g., 10) as exemplified here may comprise a cluster of twelve LED light radiation generators operating on at least five different emission wavelength ranges, optionally on six or seven different emission wavelength ranges.
  • said array may comprise, in addition to said cluster of LED light radiation generators, a further set of LED light radiation generators (see, for example, the generators DR in Figure 6) , which emit additional light radiation with respect to the light radiation emitted by said cluster of LED light radiation generators.
  • the cluster may comprise at least one LED light radiation generator (DR) that emits in a respective emission wavelength range from 638 nm to 660 nm, optionally around 650 nm.
  • DR LED light radiation generator
  • the cluster may comprise LED light radiation generators selected from generators of:
  • - blue light radiation e.g. RB
  • an emission wavelength range from 443 nm to 468 nm, optionally around 450 nm;
  • - cyan light radiation e.g. CY
  • an emission wavelength range from 495 nm to 510 nm, optionally around 505 nm;
  • aquamarine light radiation e.g. AQ
  • an emission wavelength range from 475 nm to 495 nm, optionally around 485 nm;
  • - green light radiation e.g. GR
  • emission wavelength range from 515 nm to 535 nm, optionally around 525 nm;
  • - red light radiation in an emission wavelength range from 638 nm to 660 nm, optionally around 650 nm;
  • - lime light radiation e.g. PCL
  • PCL - lime light radiation
  • - amber light radiation e.g. PCA
  • PCA - amber light radiation
  • the cluster may comprise
  • one cyan light radiation generator e.g. CY
  • one green light radiation generator e.g. GR
  • red light radiation generators e.g. DR
  • the cluster may comprise (be constituted by) :
  • one green light radiation generator e.g. GR
  • red light radiation generators e.g. DR
  • two lime light radiation generators e.g. PCL
  • four amber light radiation generators e.g.
  • an assortment may comprise a plurality of different light radiation sources (for example, with "scaled" numbers of LED generators as a function of different values of current density provided for the operation of the source) , the assortment may comprise:
  • a first light radiation source as exemplified here, comprising respective numbers of LED light radiation generators that emit light radiation at respective emission wavelength ranges,
  • At least one second light radiation source wherein :
  • the number of red (DR) and amber (PCA) light radiation generators is less than the number of red (DR) and amber (PCA) LED light radiation generators in said first light radiation source;
  • the number of red (DR) and amber (PCA) light radiation generators is greater than the number of red (DR) and amber (PCA) LED light radiation generators in said first light radiation source;
  • either said cyan (CY) or aquamarine (AQ) light radiation source in the first light radiation source is replaced by a lime (PCL) , amber (PCA) or red (DR) light radiation generator.
  • PCL lime
  • PCA amber
  • DR red
  • a radiation source as exemplified here may generate about 2000 lm e.g. at 45 lm/W (at full power) with about 1000-1200 lm at 3200 K at CRI 98 and 5600 K at CRI 98.
  • a source of radiation as exemplified here may be used as the only source in a lighting device (luminaire) of contained power, possibly in conjunction with a mixing device (rod) for collimating and simultaneously mixing the light radiation and/or an outlet collimation lens to shape the light beam.
  • a lighting device luminaire
  • a mixing device rod
  • Light radiation sources 10 Substrate 12 LED cluster, central region 14 LED cluster, peripheral region 16 Blue light radiation generator RB Cyan light radiation generator CY Aquamarine light radiation generator AQ Green light radiation generator GR Deep red light radiation generator DR Lime light radiation generator PCL Amber light radiation generator PCA Controller C Light-impermeable material 20

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Abstract

An array (10) of LED light radiation generators arranged on a substrate (12) comprises a cluster (14, 16) of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PGA) configured to emit light radiation at different emission wavelength ranges. The cluster (14, 16) of LED light radiation generators comprises both direct-emitting LED light radiation generators (RB, CY, AQ, GR, DR) and phosphor-converted LED light radiation generators (PCL, PGA), these generators being individually controllable (C) to vary the intensity of the light radiation emitted thereby. The number of LED light radiation generators in the cluster (14, 16) is greater than the number of the different emission wavelength ranges, so that the cluster (14, 16) comprises : i) first LED light radiation generators (RB, CY, AQ, GR), each of said first LED light radiation generators being the only one to emit light radiation at a certain emission wavelength range, and - ii) second LED light radiation generators (DR, PCL, PGA), each second LED light radiation generator having at least one homologous second LED light radiation generator in the cluster (14, 16) that emits light radiation at a respective common emission wavelength range.

Description

"A LIGHT RADIATION SOURCE AND CORRESPONDING ASSORTMENT"
k k k k
Technical field
The description relates to light radiation sources .
One or more embodiments may refer to light radiation sources using electrically-powered light radiation generators, such as solid-state light radiation generators, for example, LEDs.
Technological background
To generate light radiation of a single color or of several colors, it is possible to use arrays of light radiation generators with associated optical systems which may comprise, for example, lenses of various kinds such as plane-convex lenses, so-called "lenslets" to achieve a function of Koehler integration, spherical condensation lenses, zoom optics with movable lenses capable of achieving the required beam opening angles.
When producing light radiation sources of this nature, different factors come into play. One of these factors can be represented by selecting light radiation generators (for example, LED chips) . This is in regards to the color points, the emission wavelengths, the power supply current density, and to the location of the individual chips in groups or clusters arranged on a mounting support or substrate. This last aspect may prove to be critical for mixing light radiations coming from different colored sources in order to achieve a homogeneous resultant light radiation.
At the production level, further critical aspects may emerge, for example, related to selecting (so- called "binning") the chips according to their emission characteristics, or regarding the possibility of having a large number of driving channels of the chips. From a technological point of view, further factors may also come into play, such as, for example, the heat dissipation and/or the production of a specific layout (for example, on several layers) . In such a context, it may be desirable to be able to use, at least to a certain extent, available and tested technological components and/or solutions.
Various commercially available solutions address various aspects related to producing these light radiation sources.
For example, on the filing date of the present application; at the following web address: http : //www. nichia . co . jp/en/product/led sp optisolis . htm 1, the presentation can be accessed of a white LED (Ultra-High CRI White LED) available under the trade name Optisolis™ from the company Nichia of 491 Oka, Kaminaka-Cho, Anan-Shi, TOKUSHIMA 774-8601, Japan, made with Chip-On-Board (COB) technology, and capable of emitting light radiation with a power in the order of about 70 watts, efficiency above 100 lm/W and a Color Rendering Index - CRI close to 100.
It should be noted that this light radiation source is a fixed light radiation source, without colored emission capacity. The scalability according to the COB technology is obtained by adopting COB with different power levels and by scaling the projection optics .
The commercial product known under the name LUXITUNE™ by the company LED Engin (see, for example, http : //www . ledengin . com/products/ luxitune ) makes it possible to create adjustable light radiation sources (tunable) with regard to the light radiation emitted.
It should be noted, however, that this possibility of adjustment is limited to a fairly narrow range (due to the reduced color range of the various light radiation generators) within a single collimation system, therefore, without offering particular qualities of scalability.
Also available from other commercial operators are light radiation sources having scalability characteristics, with limited characteristics regarding color mixing and flexibility of use (also due to the limitation of the range of colors available within the array of the light radiation source) .
Object and summary
One or more embodiments aim to provide the object of contributing to provide further improvements in producing light radiation sources with the ability to take into account the aspects outlined above.
According to one or more embodiments, this object can be achieved thanks to a light radiation source having the characteristics referred to in the following claims .
One or more embodiments may relate to a corresponding assortment of light radiation sources comprising light radiation sources with differentiated characteristics from each other, for example, "scaled" as a function of different current density values provided for their operation.
The claims form an integral part of the technical disclosure provided here in relation to the embodiments .
One or more embodiments may involve defining criteria for selecting and placing the light radiation generators included in the source, for example, in relation to the choice of the emission characteristics of the generators (for example, by using light radiation generators operating in the region of deep red) , with the ability to take into account factors such as, for example, the number of light radiation generators included in the light radiation source (for example, using twelve, sixteen or more light radiation generators) and/or defining rules for placing the individual generators within a group (cluster) so as to facilitate mixing the respective colors, for example, at the level of secondary optics.
One or more embodiments may facilitate achieving improvements in relation to several aspects which, in themselves, can also be seen as conflicting, such as, for example:
- values of efficiency and quality of the light radiation (for example, at the level of color rendering) comparable with those of traditional light sources ,
availability of a wide range of colors, including, for example, in addition to white radiation (for example, with adjustable correlated color temperature - CCT) , a wide selection of saturated colors as well,
- possibility to "scale" the light emission levels according to the application and use requirements,
applicability to lighting devices capable of generating a uniform light intensity distribution within the projected light beam (for example, for the lighting of stages or similar applications), possibly in conjunction with Fresnel optics,
- adaptability to lighting devices (light engines) capable of generating more specific color combinations (being able to give rise to different color combinations without having to re-design the device) .
Brief description of the attached figures
One or more embodiments will be now described, purely by way of non-limiting example, with reference to the attached figures, wherein:
Figure 1 is a block diagram illustrating possible embodiments,
- Figures 2 to 5 exemplify possible implementative variations of embodiments,
Figure 6 illustrates yet another possible variant of embodiments, and
- Figure 7 exemplifies a possible implementation of embodiments at the physical component level.
It will be appreciated that, for clarity and simplicity of illustration, the various figures may not be reproduced on the same scale.
Furthermore, it will be appreciated that elements or characteristics presented here, individually or in combination with each other, in relation to embodiments exemplified in a certain figure of the attached figures can also be applied to embodiments exemplified in any of the other figures herein attached.
In other words, the fact that a given element or characteristic is exemplified here with reference to a certain figure is not to be understood, even only indirectly, as indicative of the fact that this element or characteristic is constrained to use only in the embodiments exemplified in the Figure (s) in which this element or characteristic is represented here.
Detailed description of examples of embodiments
In the figures, reference 10 indicates - as a whole - a light radiation source using electrically- powered light radiation generators.
In one or more embodiments, it is possible to use solid-state light radiation generators, such as, for example, LED light radiation generators.
In one or more embodiments, the source 10 may comprise a mounting substrate or support 12.
In one or more embodiments, it is possible to use a planar substrate of materials such as, for example, aluminum nitride (AIN) or alumina (AL2O3) or, in general, of ceramic or similar material that can exhibit heat dissipation characteristics.
In one or more embodiments, as herein exemplified, the source 10 may comprise a plurality of single light radiation generators applied onto the substrate 12, optionally in the absence of a superimposed covering such as, for example, a lamina or dome of glassy material.
As will be seen, in one or more embodiments such a covering may, however, be provided, at least as a temporary covering ("sacrificial") , which can be used during production of the light radiation source 10, and can then be removed or eliminated.
It will be appreciated that the individual light radiation generators can be made according to known technologies, for example, by resorting to technologies used to make light radiation generators (white light and/or colored light) currently available at the applicant companies.
These technologies are to be considered known and familiar, which makes it unnecessary to provide a more detailed description here.
This also applies to the driving (power supply and control) of the individual light radiation generators comprised in the array, starting from a control unit C capable of performing a control action, for example, of the light radiation flux emitted by each generator included in the source 10. This can happen thanks to an intervention on the value (for example, average) of the power supply signal supplied to the single generators, for example, with a function of the type currently called "dimming". Such a function of adjusting the emitted light intensity can be carried out, for example, by supplying the light radiation generators with a pulse-width modulation signal, the duty cycle of which is selectively varied, or with other solutions known to those skilled in the art.
Regarding the ability to perform a single addressing function of each light radiation generator in the source 10, reference can be made, for example, to the solutions described in the documents US 2013/093354 A1 , US 2016/249431 A1 or US 2006/091416 A1.
One or more embodiments may envisage that within the array of light radiation generators of the source 10, there is a group or cluster formed by a certain number of light radiation generators (for example, twelve) arranged according to a general cross-shaped configuration. The term "within" intends to highlight the fact (as exemplified in Figure 6, which will be discussed later) that the array of light radiation generators of the source 10 may comprise further generators in addition to those of the group or cluster.
The cruciform arrangement of the aforesaid cluster, as exemplified here, may comprise a central portion or region 14 (comprising four generators) surrounded by a peripheral portion or region 16 comprising, in the example considered, eight light radiation generators, to make a total of twelve generators .
In the cruciform arrangement as exemplified here, the peripheral portion or region 16 may comprise four pairs of generators with each pair located at one of the sides of the central region or portion 14, or rather, a pair at the top, a pair at the bottom, a pair on the left and a pair on the right.
It will also be appreciated that characteristics such as, for example:
the number of light radiation generators included in the cluster 14, 16 (and, more generally, in the array) ,
- the shape of these generators (in particular of their light-radiation emitting surface (Light Emitting Surface or LES), exemplified here as a square shape, the fact that the generators have the same emission surface,
the overall formation of the cluster, exemplified here as having a cross shape
are not to be understood - even only indirectly - as imperative characteristics of the embodiments.
One or more embodiments may, in fact, envisage variations in one or more of the characteristics considered above.
Just to give some examples (among many possible ones), in one or more embodiments:
- the cluster may have a rounded shape with, for example, a central region or portion 14 of circular shape comprising light radiation generators shaped like a circular sector (i.e. a segment), and the peripheral region or portion 16 comprising light radiation generators shaped as a circular crown segment;
- the various generators may have different shapes (think, for example, of the sector shapes and circular crown segment mentioned above) and/or different dimensions, being able, for example, to play on factors such as the radial dimension of light radiation generators formed as a sector or a circular crown segment and/or on the angular extension of these sectors or segments to modify these dimensions.
The shape and size of the various generators are therefore variables that can come into play in defining the characteristics of embodiments, since it is possible, for example, to use generators or chips (e.g. squares) of different sizes and/or use chips with different shapes (e.g. hexagonal, segment-shaped, etc.)
One or more embodiments may relate to the selection of colors (i.e. of the emission wavelength ranges) of the various generators and/or the location of the generators within the cluster 14, 16.
For example, one or more embodiments may envisage using, within a cluster comprising twelve light radiation generators, as exemplified in the figures, light radiation generators of six or seven different "chromatic" types, that is, such as to emit light radiation in seven (Figures 1 to 4 and 6) or six (Figure 5) different emission wavelength ranges.
In one or more embodiments, for example, light radiation generators can be used - known per se, as already mentioned - comprising (referring to the case in which light radiation generators of seven different chromatic types are used) :
- a blue emission LED light radiation generator, indicated with RB in the figures, which emits blue light (royal blue) in the range of 443 nm to 468 nm, optionally around 450 nm;
- a cyan emission LED light radiation generator, indicated with CY in the figures, which emits cyan light in the range of 495 nm to 510 nm, optionally around 505 nm;
an aquamarine emission LED light radiation generator, indicated with AQ in the figures, which emits aquamarine light in the range of 475 nm to 495 nm, optionally around 485 nm;
- a green emission LED light radiation generator, indicated with GR in the figures, which emits green light in the range of 515 nm to 535 nm, optionally around 525 nm;
a deep red emission LED light radiation generator, indicated with DR in the figures, which emits deep red in the range of 638 nm to 660 nm, optionally around 650 nm;
- a lime emission LED light radiation generator, indicated with PCL in the figures, which emits lime light in the range of 560 nm to 580 nm, optionally around 570 nm;
- an amber emission LED light radiation generator, indicated with PCA in the figures, which emits amber light in the range of 580 nm to 600 nm, optionally around 590 nm;
In this regard, it will be appreciated that the blue, cyan, aquamarine, green and (deep) red light radiation generators can be produced by means of direct emission LED generators, while the lime and amber color generators can be produced by means of phosphor- converted LED generators .
One or more embodiments may envisage choosing the number of the various generators (in short, "chips") comprised in the cluster 14, 16 according to a criterion of expressible proportionality (always referring to the case in which light radiation generators of seven different color types are used) in the following form.
blue: cyan: aquamarine: green: deep red: lime: amber = 1:1:1:1:2:2:4.
It has been observed that this choice may correspond to a distribution of outgoing light flux (measured in lumens) expressible in the form:
blue: cyan: aquamarine: green: deep red: lime: amber = 0.6:2:1.8:4:1:12:9 within a range of +/- 50% of each flux value, except for the deep red where the variation can be in the order of 100% considering the sensitivity of the human eye.
In terms of radiometric power, the proportionality ratio can be expressed in the following terms:
blue: cyan: aquamarine: green: deep red: lime: amber = 0.9:0.35:0.6:0.5:1:1.3:1.4 with a variation of It has been observed that this variation may depend on the chip manufacturing technology and the driving current. The values shown above refer to a current density in the order of 1-1.5 A/mm2.
In the case in which the driving current (density) is varied, for example, by increasing it to 3 A/mm2 it is possible - as illustrated below - to correspondingly scale the number of chips while maintaining the light power ratio within the specified range.
One or more embodiments may envisage that the distribution of the light radiation generators in the cluster 14, 16 follows (with reference to the example presented here with four generators in the central zone or region 14 and eight generators in the outer zone or region 16) application of guidelines of the type:
for the colors "represented" by four chips (amber, in the example considered here) : location in the outer region 16, in non-adjacent positions; and/or - for the colors represented by two chips (lime and deep red, in the example considered in Figures 1 to 4 and 6) : location in the outer region 16, in non- adjacent positions; and/or
for the colors represented by a single chip: location in the inner region or portion 14.
Applying these guiding criteria can be tempered, in one or more embodiments, by applying additional redistribution criteria aimed at further improving the mixing effect of the various colors.
For example, these additional criteria may envisage - in the presence of chips placed in the outer region or portion 16 (respectively, inner 14) and such as to emit light radiation in emission ranges close to each other - at least one of these colors close together can be located in the inner region or portion 14 (respectively, outer 16) . In other words, in the presence of a set of said LED light radiation generators emitting light radiation at mutually proximate emission wavelength ranges, at least one of the light radiation generators in the set is arranged in either (14, resp. 16) said central region 14 or said peripheral region 16, and the other light radiation generator (s) in the set is/are arranged in the other (16, resp. 14) of said central region 14 or said peripheral region 16.
For example, independently of the specific reference to the example presented herein, chips can be considered such as to emit light radiation in emission ranges close to each other, which emit red, amber and lime color radiation, respectively, or chips that emit blue, cyan and aquamarine color radiation, respectively.
One or more embodiments may envisage the redefinition of the specific rules as a function of a different number of chips.
It will be appreciated that one or more embodiments may envisage the use of at least one chip that emits in the region of deep red. It has been verified that this choice allows, for example, within combinations of six or seven colors as exemplified here, obtainment of an overall emission that approximates the emission of a traditional tungsten lamp until it can actually be considered as coincident by a not particularly experienced observer.
Figure 2 exemplifies, for direct comparison with Figure 1, the possibility of producing - adopting the same criteria exemplified above - a light radiation source 10 with a different arrangement of the chips with respect to that exemplified in Figure 1.
Figures 3 and 4 exemplify the possibility, for example, if light radiation generators capable of sustaining higher current levels (for example, a current in the order of 3 A/mm2, in practice at least twice the current density of 1-1.5 A/mm2 considered previously) are used, for example, to reduce the number of generators that emit amber-colored light radiation in favor of generators (in themselves less efficient) that emit in the deep red region
One or more embodiments may thus envisage the possibility to "scale" the number of chips to vary the current density.
Embodiments as exemplified in Figures 1 to 4 envisage the presence - in the cluster 14, 16 - of (for example, twelve) light radiation generators operating in seven respective wavelength emission ranges, different from each other (i.e. RB, CY, AQ, GR, DR, PCL, PCA) .
This choice is not in itself imperative.
One or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in a number of different respective emission wavelength ranges, greater than or less than seven.
For example, one or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in a number of different respective emission wavelength ranges equal to at least five .
For example, one or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in five different respective emission wavelength ranges: e.g. red (DR), green (GR) , blu (RB) , amber (PCA) and lime (PCL) .
For example, one or more embodiments may envisage the presence - in the cluster 14, 16 - of light radiation generators operating in six different respective emission wavelength ranges: e.g. red (DR), green (GR) , blu (RB) , amber (PCA) and lime (PCL) , and aquamarine (AQ) .
Figure 5 exemplifies, in fact, embodiments in which the use of light radiation generators operating in six different respective emission wavelength ranges is envisaged: e.g. red (DR - three generators), green (GR - one generator) , blue (RB - one generator) , amber (PCA - four generators), lime (PCL - two generators) and aquamarine (AQ - one generator) , thus without the provision of a generator operating in the cyan (CY) range, "replaced" by a generator operating in the red (DR) range.
Also in embodiments as exemplified in Figure 5: the cluster 14, 16 comprises both direct- emitting LED light radiation generators (RB, AQ, GR, DR) and phosphor-converted LED light radiation generators (PCL, PCA) ,
The number of LED light radiation generators in the cluster 14, 16 (equal to twelve) is greater than the number of the different emission wavelength ranges (equal to six) .
- first LED light radiation generators (RB, AQ, GR) are present, with each of said first LED light radiation generators being the only one in the cluster to emit light radiation at a certain emission wavelength range, and
- second LED light radiation generators (DR, PCL, PCA) are also present, with each of these second LED light radiation generators having at least one homologous second LED light radiation generator in the cluster that emits light radiation at a respective common emission wavelength range.
Figure 6 exemplifies the possibility, in one or more embodiments, to integrate the "cluster" 14, 16 (comprising twelve generators in the embodiment presented here, which is such) in an array which, in addition to this cluster, comprises additional generators, for example, four additional generators (with an overall number of generators which then becomes equal to sixteen) , with these additional generators comprising, for example, four generators of deep red color DR.
One or more embodiments may envisage the further increase of the number of light radiation generators, correspondingly increasing the overall dimensions of the device, for example, by allocating twenty-five generators instead of twelve, that is, in practice, doubling the structure exemplified here.
As already stated, the source 10 can be provided with a covering, for example, of glassy material.
In one or more embodiments this can be a "sacrificial" cover used during assembly of the source 10 and intended to be removed or eliminated at the end of the assembly operation.
This cover can be and/or become a stable cover intended to protect the generators during use of the source 10.
In one or more embodiments, it is possible to envisage producing light radiation sources 10 available in an assortment of different variants with at least partially different chromatic characteristics for the various sources included in the assortment.
For example, to give rise to a colder light radiation, it is possible to increase the number of blue, cyan, aquamarine, green or lime generators by correspondingly reducing the number of amber or red generators .
In a complementary way, to give a warmer overall radiation, it is possible to increase the number of red and amber generators by correspondingly reducing the number of other colors. If it is desirable to have high flux values, in the face of a possible limited reduction in the range of available colors, one of the cyan or aquamarine chips can be replaced with another generator, for example, lime, amber or red.
One or more embodiments may envisage delivering a material 20 impermeable to light radiation (T1O2) so as to reduce possible leakage between adjacent generators, for example, (as exemplified by dashed lines in Figure 1 only) at the generators operating by means of phosphor conversion (amber PCA and lime PCL, in the example considered) .
In one or more embodiments (see, for example, Figure 6) it is possible to envisage the addition of chips in the array that contribute to increasing the overall flux (for example, by adding amber and lime generators or deep red generators, which contribute to the lower values of correlated color temperature and of parameter R9)
As known, the Color Rendering Index, or CRI is a parameter used to describe how faithfully the light sources render the color of the objects they illuminate, calculated by comparing the appearance of eight reference colors (from R1 to R8) . It is also possible to consider a more saturated color reference, known as R9 (red) , with a high value R9, indicative of a better chromatic rendering for various applications.
It will be appreciated that one or more embodiments facilitate the use of dimming techniques in order to provide a High Color Rendering - HCR.
A light radiation source (e.g. 10), as exemplified here, may therefore comprise an array of LED light radiation generators arranged on a substrate (e.g. 12), the array comprising a cluster (e.g. 14, 16) of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) , configured to emit light radiation at different emission wavelength ranges.
As exemplified here:
- the cluster (e.g. 14, 16) of LED light radiation generators may comprise both direct-emitting LED light radiation generators (e.g. RB, CY, AQ, GR, DR) and phosphor-converted LED light radiation generators (e.g. PCL, PCA) ,
the LED light radiation generators in the cluster are individually controllable (e.g. by means of the controller C) to vary the intensity of the light radiation emitted thereby,
- the number of LED light radiation generators in the cluster (e.g. twelve) is greater than the number of said different emission wavelength ranges (e.g. at least five, optionally six - see Figure 5 - or seven - see Figures 1 to 4),
- the cluster of LED light radiation generators may include:
- i) first LED light radiation generators (RB, CY, AQ, GR) , each of said first LED light radiation generators being the only one in the cluster (14, 16) to emit light radiation at a certain emission wavelength range, and
- ii) second LED light radiation generators (e.g. DR, PCL, PCA) , each of said second LED light radiation generators having at least one homologous second LED light radiation generator in the cluster (or rather, at least one "twin" generator) that emits light radiation at a respective common emission wavelength range.
As exemplified here, the cluster of LED light radiation generators may comprise a central region (e.g. 14) and a peripheral region (e.g. 16) around the central region, with:
- at least half of said first LED light radiation generators (RB, CY, AQ, GR) that can be arranged in said central region (see, for example, Figures 1 to 4, where at least two of the first four generators, i.e. AQ, CY or AQ, RB are in the region 14), and/or
- a (simple) majority of said second LED light radiation generators (e.g. DR, PCL, PCA) that can be arranged at said peripheral region (see, e.g., all Figures 1 to 6, with the PCL and PCA generators in Figures 1, 2, 5 and 6, the generators PCA and DR in
Figure 3, or again the generators PCL and DR in Figure 4, which are six out of eight among the generators in the peripheral region 16 and/or with the majority of the second generators DR, PCL, PCA arranged in the peripheral region 16) .
As exemplified here, the emission wavelength ranges of said first LED light radiation generators (e.g. RB, CY, AQ, GR) may constitute the majority of the emission wavelength ranges emitted at said central region (see, for example, Figures 1 to 4 where two out of three of the emission wavelength ranges emitted at the central region 14 are emitted by generators selected from the first generators of light radiation LED (e.g. RB, CY, AQ, GR) .
As exemplified here, the cluster of LED light radiation generators may comprise a central region (e.g. 14) and a peripheral region (e.g. 16) around the central region, and wherein:
- said second LED light radiation generators (DR, PCL, PCA) are arranged at said peripheral region in the absence of homologous second LED light radiation generators arranged adjacent to each other, and/or
in the presence of a set of said LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) that emit light radiation at mutually proximate emission wavelength ranges, at least one of the light radiation generators in the set is located in either (14, resp. 16) said central region (14) or said peripheral region (16) and the other light radiation generator (s) in the set is/are arranged in the other (16, resp. 14) of said central region (14) or said peripheral region (16) .
As exemplified here:
the substrate (e.g. 12) may comprise ceramic material and/or
- the light radiation generators can be arranged on the substrate in the absence of a cover left in place to cover the light radiation generators (for example, a sacrificial cover can be provided, intended to be used during the mounting of the source, and then removed or eliminated), and/or
light-impermeable material (e.g. 20) may be provided between light radiation generators in the cluster to counter lateral light leakage.
A light radiation source (e.g., 10) as exemplified here may comprise a cluster of twelve LED light radiation generators operating on at least five different emission wavelength ranges, optionally on six or seven different emission wavelength ranges.
As exemplified here, said array may comprise, in addition to said cluster of LED light radiation generators, a further set of LED light radiation generators (see, for example, the generators DR in Figure 6) , which emit additional light radiation with respect to the light radiation emitted by said cluster of LED light radiation generators.
As exemplified here, the cluster may comprise at least one LED light radiation generator (DR) that emits in a respective emission wavelength range from 638 nm to 660 nm, optionally around 650 nm.
As exemplified here, the cluster may comprise LED light radiation generators selected from generators of:
- blue light radiation (e.g. RB) in an emission wavelength range from 443 nm to 468 nm, optionally around 450 nm;
- cyan light radiation (e.g. CY) in an emission wavelength range from 495 nm to 510 nm, optionally around 505 nm;
aquamarine light radiation (e.g. AQ) in an emission wavelength range from 475 nm to 495 nm, optionally around 485 nm;
- green light radiation (e.g. GR) in an emission wavelength range from 515 nm to 535 nm, optionally around 525 nm;
- red light radiation (e.g. DR) in an emission wavelength range from 638 nm to 660 nm, optionally around 650 nm;
- lime light radiation (e.g. PCL) in an emission wavelength range from 560 nm to 580 nm, optionally around 570 nm;
- amber light radiation (e.g. PCA) in an emission wavelength range from 580 nm to 600 nm, optionally around 590 nm.
As exemplified herein (see, for example, Figures 1 to 4 and again Figure 6) , for each generator of blue light radiation (e.g. RB) the cluster may comprise
(be constituted by) :
- one cyan light radiation generator (e.g. CY) ;
- one aquamarine light radiation generator (e.g.
AQ) ;
- one green light radiation generator (e.g. GR) ;
- two red light radiation generators (e.g. DR) ;
- two lime light radiation generators (e.g. PCL) ;
- four amber light radiation generators (e.g. PCA) . As exemplified herein (see, for example, Figure 5) , for each generator of blue light radiation (e.g. RB) , the cluster may comprise (be constituted by) :
- one aquamarine light radiation generator (e.g.
AQ) ;
- one green light radiation generator (e.g. GR) ;
- three red light radiation generators (e.g. DR);
- two lime light radiation generators (e.g. PCL) ; four amber light radiation generators (e.g.
PCA) .
The fact of referring to the number of different types of generators present for each blue light radiation generator takes into account the fact that one or more embodiments may envisage the use of several clusters/arrays of the type exemplified herein.
As exemplified here, an assortment may comprise a plurality of different light radiation sources (for example, with "scaled" numbers of LED generators as a function of different values of current density provided for the operation of the source) , the assortment may comprise:
- a first light radiation source as exemplified here, comprising respective numbers of LED light radiation generators that emit light radiation at respective emission wavelength ranges,
at least one second light radiation source wherein :
- the number of red (DR) and amber (PCA) light radiation generators is less than the number of red (DR) and amber (PCA) LED light radiation generators in said first light radiation source; and/or
- the number of red (DR) and amber (PCA) light radiation generators is greater than the number of red (DR) and amber (PCA) LED light radiation generators in said first light radiation source; and/or
- either said cyan (CY) or aquamarine (AQ) light radiation source in the first light radiation source is replaced by a lime (PCL) , amber (PCA) or red (DR) light radiation generator.
A radiation source as exemplified here may generate about 2000 lm e.g. at 45 lm/W (at full power) with about 1000-1200 lm at 3200 K at CRI 98 and 5600 K at CRI 98.
A source of radiation as exemplified here may be used as the only source in a lighting device (luminaire) of contained power, possibly in conjunction with a mixing device (rod) for collimating and simultaneously mixing the light radiation and/or an outlet collimation lens to shape the light beam.
Again, as already said at the beginning of the present detailed description, elements and characteristics presented here, individually or in combination with one another, with reference to embodiments exemplified in one or more of the figures attached herein can also be applied, individually or in combination, to embodiments exemplified in other figures .
Moreover, the fact that a given element or characteristic have been exemplified here with reference to a certain figure is not to be understood, even only indirectly, as indicative of the fact that this element or characteristic is constrained to use only in the embodiments exemplified in the Figure (s) in which this element or characteristic is represented here.
Without prejudice to the underlying principles the details of construction and the embodiments may vary, even significantly, with respect to those described here, purely by way of non-limiting example, without departing from the scope of the invention.
The extent of protection is determined by the annexed claims. LIST OF REFERENCE SIGNS
Light radiation sources 10 Substrate 12 LED cluster, central region 14 LED cluster, peripheral region 16 Blue light radiation generator RB Cyan light radiation generator CY Aquamarine light radiation generator AQ Green light radiation generator GR Deep red light radiation generator DR Lime light radiation generator PCL Amber light radiation generator PCA Controller C Light-impermeable material 20

Claims

1. A light radiation source (10) comprising an array of LED light radiation generators arranged on a substrate (12), the array comprising a cluster (14, 16) of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) configured to emit light radiation at different emission wavelength ranges, wherein:
the cluster (14, 16) of LED light radiation generators comprises both direct-emitting LED light radiation generators (RB, CY, AQ, GR, DR) and phosphor- converted LED light radiation generators (PCL, PCA) , the LED light radiation generators in the cluster (14, 16) are individually controllable (C) to vary the intensity of the light radiation emitted thereby,
- the number of LED light radiation generators in the cluster (14, 16) is higher than the number of said different emission wavelength ranges, wherein the cluster (14, 16) of LED light radiation generators comprises :
- i) first LED light radiation generators (RB, CY, AQ, GR) , each said first LED light radiation generator being the only one in the cluster (14, 16) to emit light radiation at a certain emission wavelength range, and
- ii) second LED light radiation generators (DR, PCL, PCA) , each said second LED light radiation generator having at least one homologous second LED light radiation generator in the cluster (14, 16) emitting light radiation at a respective common emission wavelength range.
2. The light radiation source (10) of claim 1, wherein the cluster of LED light radiation generators comprises a central region (14) and a peripheral region (16) around the central region (14), wherein at least half of said first LED light radiation generators (RB, CY, AQ, GR) is arranged at said central region (14) and/or a majority of said second LED light radiation generators (DR, PCL, PCA) is arranged at said peripheral region (16) .
3 . The light radiation source (10) of claim 1 or claim 2, wherein the cluster of LED light radiation generators comprises a central region (14) and a peripheral region (16) around the central region (14) and wherein the emission wavelength ranges of said first LED light radiation generators (RB, CY, AQ, GR) are the majority of the emission wavelength ranges emitted at said central region (14) .
4 . The light radiation source (10) of any of claims 1 to 3, wherein the cluster of LED light radiation generators comprises a central region (14) and a peripheral region (16) around the central region (14) and wherein:
- said second LED light radiation generators (DR, PCL, PCA) are arranged at said peripheral region (16) in the absence of homologous second LED light radiation generators arranged adjacent to each other, and/or
in the presence of a set of said LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) emitting light radiation at mutually proximate emission wavelength ranges, at least one of the light radiation generators in the set is arranged in one (14, resp. 16) of said central region (14) and said peripheral region (16) and the other light radiation generator/s in the set is/are arranged in the other (16, resp. 14) of said central region (14) and said peripheral region (16) .
5 . The light radiation source (10) of any of the previous claims, wherein:
- the substrate (12) comprises ceramic material and/or - the light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) are arranged on the substrate (12) in the absence of a cover left in place to cover the light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) and/or
light-impermeable material (20) is provided between light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) in the cluster (14, 16) to counter lateral light leakage.
6. The light radiation source (10) of any of the previous claims, comprising a cluster (14, 16) of twelve LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) operating at at least five different emission wavelength ranges, preferably at six or seven different emission wavelength ranges.
7. The light radiation source (10) of any of the previous claims, wherein said array comprises, in addition to said cluster (14, 16) of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) , a further set of LED light radiation generators (DR) emitting additional light radiation to the light radiation emitted from said cluster of LED light radiation generators.
8. The light radiation source (10) of any of the previous claims, wherein the cluster (14, 16) comprises includes at least one LED light radiation generator (DR) emitting in a respective emission wavelength range from 638nm to 660nm, preferably around 650nm.
9. The light radiation source (10) of any of the previous claims, wherein said cluster (14, 16) comprises LED light radiation generators selected out of generators of:
blue light radiation (RB) in an emission wavelength range from 443nm to 468nm, preferably around 450nm; cyan light radiation (CY) in an emission wavelength range from 495nm to 510 nm, preferably around 505nm;
- aquamarine light radiation (AQ) in an emission wavelength range from 475nm to 495nm, preferably around 485nm;
green light radiation (GR) in an emission wavelength range from 515nm to 535nm, preferably around 525nm;
red light radiation (DR) in an emission wavelength range from 638nm to 660nm, preferably around 650nm;
lime light radiation (PCL) in an emission wavelength range from 560nm to 580nm, preferably around 57 Onm;
amber light radiation (PCA) in an emission wavelength range from 580nm to 600nm, preferably around 590nm.
10 . The light radiation source (10) of claim 9, wherein said cluster (14, 16) comprises, for each blue light radiation generator (RB) :
- one cyan light radiation generator (CY) ;
- one aquamarine light radiation generator (AQ) ;
- one green light radiation generator (GR) ;
- two red light radiation generators (DR) ;
- two lime light radiation generators (PCL) ;
- four amber light radiation generators (PCA) .
11 . The light radiation source (10) of claim 9, wherein said cluster (14, 16) comprises, for each blue light radiation generator (RB) :
- one aquamarine light radiation generator (AQ) ;
- one green light radiation generator (GR) ;
- three red light radiation generators (DR) ;
- two lime light radiation generators (PCL) ;
- four amber light radiation generators (PCA) .
12 . An assortment comprising a plurality of light radiation sources (10), the assortment comprising:
- a first light radiation source (10) according to any of claims 9 to claim 11, comprising respective numbers of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PCA) emitting radiation at respective emission wavelength ranges,
at least one second light radiation source wherein :
- the number of red (DR) and amber (PCA) light radiation generators is lower than the number of red (DR) and amber (PCA) LED light radiation generators in said first light radiation source; and/or
- the number of red (DR) and amber (PCA) light radiation generators is higher than the number of red (DR) and amber (PCA) LED light radiation generators in said first light radiation source; and/or
- one of said cyan (CY) and aquamarine (AQ) light radiation sources in the first light radiation source is replaced by a lime (PCL) , amber (PCA) or red (DR) LED light radiation generator.
EP19779193.2A 2018-09-28 2019-09-26 A light radiation source and corresponding assortment Active EP3857122B1 (en)

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PCT/IB2019/058160 WO2020065566A1 (en) 2018-09-28 2019-09-26 A light radiation source and corresponding assortment

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