WO2013127923A1 - Illuminating device and luminaire comprising the illuminating device - Google Patents

Illuminating device and luminaire comprising the illuminating device Download PDF

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Publication number
WO2013127923A1
WO2013127923A1 PCT/EP2013/054034 EP2013054034W WO2013127923A1 WO 2013127923 A1 WO2013127923 A1 WO 2013127923A1 EP 2013054034 W EP2013054034 W EP 2013054034W WO 2013127923 A1 WO2013127923 A1 WO 2013127923A1
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WO
WIPO (PCT)
Prior art keywords
illuminating device
led chips
phosphor layers
phosphor
frame
Prior art date
Application number
PCT/EP2013/054034
Other languages
French (fr)
Inventor
Tingming LIU
Peng Chen
Chuanpeng ZHONG
Shengmei Zheng
Original Assignee
Osram Gmbh
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Filing date
Publication date
Application filed by Osram Gmbh filed Critical Osram Gmbh
Publication of WO2013127923A1 publication Critical patent/WO2013127923A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • 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 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 array of point-like light-generating elements
    • F21Y2105/12—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
    • 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
    • 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
    • F21Y2113/17—Combination of light sources of different colours comprising an assembly of point-like light sources forming a single encapsulated light source
    • 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]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/508—Wavelength conversion elements having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material

Definitions

  • the present invention relates to an illuminating device and a luminaire comprising the illuminating device.
  • LED fabricated through the chip-on-board (COB) technology has been widely used in the illumination field, and thereby a good thermal conductivity can be real ⁇ ized at a low cost.
  • COB chip-on-board
  • solutions of LED illuminating device with tunable CCT are proposed.
  • such LED illuminating device usually comprises one type of LED chips and two types of different phos ⁇ phor layers, namely, a first phosphor layer and a second phosphor layer.
  • a plurality of LED chips are arranged in re ⁇ gions of the circuit board corresponding to the first and second phosphor layers, and the two types of phosphor layers are excited, respectively, and thus, two kinds of emergent light having different waveforms are generated, wherein one kind of the emergent light forms warm white light and the other kind forms cold white light.
  • the CCT of the emergent light from the first and second phosphor layers is adjusted by changing driving currents of the LED chips, and accord ⁇ ingly, the CCT of total emergent light of the illuminating device is changed.
  • the first phosphor layer is arranged in the center and the second phosphor layer is arranged to concentrically surround the first phosphor layer.
  • first emergent light and the second emergent light cannot be inten ⁇ sively mixed, as the emergent light having a first CCT emerges too intensively from the first phosphor layer in the center and the emergent light having a second CCT merely emerges from the second phosphor layer at the edge, thus, an apparent color light ring is formed on a surface to be illu ⁇ minated, and the light distribution is changed during CCT ad ⁇ justment.
  • a luminous flux corresponding to the central first phosphor layer is 20 lm
  • a luminous flux corresponding to the peripheral sec ⁇ ond phosphor layer is 46 lm
  • a light distribution pattern as shown in Fig. 1 can be obtained and a light ring is present.
  • the CCT is adjusted, if the luminous flux corresponding to the central first phosphor layer is kept to be 20 lm, and the luminous flux corresponding to the peripheral second phosphor layer is adjusted to be 23 lm, then the light dis ⁇ tribution pattern will be changed, as shown in Fig. 2, and the light ring still exists.
  • the first object of the present invention is to provide an illuminating device.
  • illuminating device By using such illuminating device, a fixed light distribution pattern can be obtained during CCT adjustment, and no light ring will appear.
  • the illuminating device comprises : a plurality of first LED chips covered by first phosphor layers, a plurality of second LED chips covered by second phosphor layers, and a circuit board for supporting the first and second LED chips, the first and second LED chips are tunable in brightness, and the first phosphor lay ⁇ ers and the second phosphor layers are alternately arranged.
  • the principle of the present invention lies in determining the positional relationships between the first and second phosphor layers, and corresponding first and second LED chips in an advantageous manner, and replacing the conventional "intensive" arrangement with the "staggered” arrangement.
  • CCTs of the first emergent light from the first phosphor lay ⁇ ers and of the second emergent light from the second phosphor layers can be changed by adjusting brightness of the first LED chips and the second LED chips. Since light sources, i.e., the LED chips, are "staggered” to each other, and the phosphor layers corresponding thereto are also “staggered” to each other, light paths of resulted emergent light are also staggered to each other.
  • the first emergent light and the second emergent light having different CCTs can be intensively mixed, the light distribution pattern of the illuminating device will not be changed during the CCT adjustment, and the generation of the light ring as mentioned in the Background Art will be avoided.
  • wavelengths of lightwaves generated when the first phosphor layers and the second phosphor layers are excited are differ ⁇ ent. That is to say, types of the first and second phosphor layers are different, and thus, cold white light and warm white light can be obtained by exciting the two types of phosphor layers.
  • the LED chips are blue LED chips
  • the first phosphor lay- ers and the second phosphor layers are YAG phosphor layers. Such combination of the blue LED chips and the YAG phosphor layers is a mainstream design in the current LED field.
  • the LED chips are UV LED chips
  • the first phosphor layers and the second phosphor layers are RGB phosphor lay ⁇ ers.
  • Such combination of the UV LED chips and the RGB phos ⁇ phor layers is a novel research orientation in the LED field.
  • the illuminating device further comprises a carrying frame, wherein the carrying frame has a frame and a plurality of partition ribs, the partition ribs divide a space defined by the frame into a plurality of carrying gaps, into which the first phosphor layers and the second phosphor layers can be filled, respectively.
  • the first phosphor layers and the second phosphor layers are cor ⁇ responding to the first LED chips and the second LED chips at fixed locations.
  • the carry- ing gaps are stripped carrying gaps, each of which is in a form of stripe, are arranged to be parallel to each other, the first phosphor layer or the second phosphor layer in each gap covers the first LED chips or the second LED chips that are linearly arranged.
  • emergent light from the illu- minating device is formed by mixture of a plurality of beams of stripped first and second emergent light. Since the stripped structure is simple, it is favorable to simplifying the manufacturing of the phosphor layers and reducing the cost. In order to obtain an optimal light mixing effect, the stripped carrying gaps preferably can have a uniform width.
  • the carrying gaps are arranged to be in a staggered arrangement, the first phosphor layer or the second phosphor layer in each gap covers one first LED chip or one second LED chip. Since the first and second phosphor layers are arranged to be, for instance, per ⁇ pendicular to each other and uniformly staggered, the generation of the light ring can be avoided to the greatest extent.
  • the carrying gaps are arranged to be concentric with each other, and the first phos ⁇ phor layer or the second phosphor layer in each gap covers the first LED chips or the second LED chips that are annu- larly arranged.
  • An ideal light mixing effect also can be ob- tained through the alternate arrangement of the first and second phosphor layers designed as concentric rings.
  • the partition ribs and the frame are made in one piece.
  • the frame is made of sil ⁇ ica gel. Such frame will not affect the illuminating effect of the illuminating device, and can fixedly keep the struc ⁇ ture of the alternate arrangement of the first and second phosphor layers, which facilitates to simplify the installa ⁇ tion of the illuminating device.
  • the illuminating device further comprises an electrically insu ⁇ lating layer and a heat sink, the electrically insulating layer and the heat sink are in thermal contact, and one side of the electrically insulating layer carries the circuit board and the other side of the electrically insulating layer is mounted on the heat sink. Therefore, heat of the illumi ⁇ nating device can be well dissipated.
  • brightness of the plurality of first LED chips and the plu ⁇ rality of second LED chips is adjusted via a first driving current and a second driving current supplied by the circuit board, respectively.
  • the CCTs of the first emergent light and the second emergent light can be simply adjusted, and further the CCT of the whole illuminating device is ad ⁇ justed to meet different application requirements.
  • the second object of the present invention is to provide a luminaire comprising the illuminating device above.
  • a user can adjust the CCT of such luminaire in a situation of keeping the light distribution unchanged, and the illuminat ⁇ ing effect without a light ring can be obtained.
  • the luminaire also comprises a reflector mounted together with the illuminating device. Emergent light from the illuminating device thereby can be reflected by the reflector to improve the luminous efficacy of the luminaire.
  • Fig. 1 is a first light distribution pattern according to the prior art
  • Fig. 2 is a second light distribution pattern according to the prior art
  • Fig. 3 is a 3D exploded view of a first embodiment of an il ⁇ luminating device according to the present invention
  • Fig. 4 is a schematic diagram of the assembled illuminating device shown in Fig. 3;
  • Fig. 5 is a schematic diagram of a second embodiment of the illuminating device according to the present invention.
  • Fig. 6 is a schematic diagram of a third embodiment of the illuminating device according to the present invention.
  • Fig. 7 is a 3D view of a luminaire according to the present invention .
  • Fig. 3 is a 3D exploded view of a first embodiment of an il- luminating device 10 according to the present invention.
  • the illuminating device 10 according to the present invention comprises first and second LED chips 1.1, 1.2, of which are tunable in brightness, and a circuit board 2, wherein the first and second LED chips 1.1, 1.2 are mounted on the cir- cuit board 2.
  • the circuit board 2 is equipped with an electrically insulating layer 7 and a heat sink 8, wherein one side of the electrically insulating layer 7 carries the circuit board 2 and the other side of the elec- trically insulating layer 7 is mounted on the heat sink 8 so as to realize thermal contact between the circuit board 2 and the heat sink 8.
  • the first LED chips 1.1 covered by first phosphor layers 5 and the sec ⁇ ond LED chips 1.2 covered by second phosphor layers 6 are the light sources of the illuminating device 10, and the first phosphor layers 5 and the second phosphor layers 6 are alter ⁇ nately arranged.
  • the first phosphor layers 5 and the second phosphor layers 6 are different types of phosphor layers in the scope of the present invention, that is to say, first emergent light and second emergent light, such as cold white light and warm white light, having different wavelengths can be obtained by exciting the first and second phosphor layers 5, 6.
  • first emergent light and second emergent light such as cold white light and warm white light
  • magnitudes of a first driving current and a second driving current supplied by the circuit board 2 to the first LED chips 1.1 and the second LED chips 1.2 are controlled, respectively, and thus the brightness of respective chip can be changed, so that the first emergent light and the second emergent light that are staggered in lo ⁇ cations can be intensively mixed to prevent generation of a light ring, and the light distribution pattern will not be changed with the CCT adjustment.
  • the illuminating device 10 further comprises a carrying frame 4 made of, for in- stance, silica gel, and the carrying frame 4 has a frame 4.1 and a plurality of partition ribs 4.2, and the frame 4.1 and the partition ribs 4.2 can be made in one piece.
  • the parti ⁇ tion ribs 4.2 divide a space defined by the frame 4.1 into a plurality of carrying gaps R, into which the first phosphor layers 5 and the second phosphor layers 6 can be filled, re ⁇ spectively, at fixed locations.
  • a plurality of first LED chips 1.1 are linearly arranged into a first col ⁇ umn
  • a plurality of second LED chips 1.2 are correspond ⁇ ingly arranged into a second column, and the first column and the second column are alternately arranged.
  • the first phos- phor layer 5 corresponding to the first LED chips 1.1 and the second phosphor layer 6 corresponding to the second LED chips 1.2 are also stripped and fixed in stripped carrying gaps R that are arranged to be parallel to each other.
  • stripped first emergent light and second emergent light can be obtained. Since the first emergent light and the second emergent light are staggered and mixed into total emergent light of the illuminating device 10, the light distribution pattern can be kept unchanged during the CCT adjustment and no light ring will appear.
  • Fig. 5 is a schematic diagram of a second embodiment of the illuminating device 10 according to the present invention.
  • a plurality of carrying gaps R are grid-shaped carrying gaps in a staggered arrangement, wherein solid boxes represent the first phosphor layers 5, corresponding to the first LED chips 1.1, accommodated in the carrying gaps R, and hollow boxes represent the second phosphor layers 6, corresponding to the second LED chips 1.2, accommodated in the carrying gaps R.
  • the first and second LED chips 1.1, 1.2 are staggered with a high density, thereby compared with the alternate arrangement of the first and second LED chips 1.1, 1.2 that are linearly arranged in the first embodiment, a better light mixing effect can be obtained.
  • Fig. 6 is a schematic diagram of a third embodiment of the illuminating device 10 according to the present invention.
  • a plurality of carrying gaps R are annular carrying gaps concentric with each other, and the first phosphor layer 5 or the second phosphor layer 6 in each annular carrying gap cov- ers the first LED chips 1.1 or the second LED chips 1.2 that are annularly arranged.
  • the annular first phosphor layers 5 and second phosphor layers 6 are concentrically alternately arranged, the annular first emergent light and second emer- gent light obtained thereby are also alternate, and similar to the first embodiment, the illuminating device 10 of this embodiment also can prevent generation of the light ring.
  • Fig. 7 shows a luminaire according to the present invention.
  • the luminaire comprises the above illuminating device 10 and a reflector 9.
  • the illuminating device 10 can be disposed on a bottom of the cup-shaped reflector 9.
  • the CCT of such luminaire is tunable while the light distribution pattern is unchanged, and the luminaire has an illuminating effect without a light ring.
  • the above is merely preferred embodiments of the present in ⁇ vention but not to limit the present invention.
  • the present invention may have vari ⁇ ous alterations and changes. Any alterations, equivalent sub ⁇ stitutions, improvements, within the spirit and principle of the present invention, should be covered in the protection scope of the present invention.

Abstract

The present invention relates to an illuminating device (10), characterized in that comprising : a plurality of first LED chips (1.1) covered by first phosphor layers (5), a plurality of second LED chips (1.2) covered by second phosphor layers (6), and a circuit board (2) for supporting the first and second LED chips (1.1, 1.2), the first and second LED chips (1.1, 1.2) are tunable in brightness, and the first phosphor layers (5) and the second phosphor layers (6) are alternately arranged. By using this illuminating device, a fixed light distribution pattern can be obtained during CCT adjustment, and no light ring will appear. In addition, the present invention also provides a luminaire having the illuminating device.

Description

Description
Illuminating Device and Luminaire Comprising the Illuminating Device
Technical Field
The present invention relates to an illuminating device and a luminaire comprising the illuminating device.
Background Art At present, the LED fabricated through the chip-on-board (COB) technology has been widely used in the illumination field, and thereby a good thermal conductivity can be real¬ ized at a low cost. Based on the COB technology, solutions of LED illuminating device with tunable CCT are proposed. In the prior art, such LED illuminating device usually comprises one type of LED chips and two types of different phos¬ phor layers, namely, a first phosphor layer and a second phosphor layer. A plurality of LED chips are arranged in re¬ gions of the circuit board corresponding to the first and second phosphor layers, and the two types of phosphor layers are excited, respectively, and thus, two kinds of emergent light having different waveforms are generated, wherein one kind of the emergent light forms warm white light and the other kind forms cold white light. The CCT of the emergent light from the first and second phosphor layers is adjusted by changing driving currents of the LED chips, and accord¬ ingly, the CCT of total emergent light of the illuminating device is changed. Generally in such illuminating device, the first phosphor layer is arranged in the center and the second phosphor layer is arranged to concentrically surround the first phosphor layer. However, one problem is that the first emergent light and the second emergent light cannot be inten¬ sively mixed, as the emergent light having a first CCT emerges too intensively from the first phosphor layer in the center and the emergent light having a second CCT merely emerges from the second phosphor layer at the edge, thus, an apparent color light ring is formed on a surface to be illu¬ minated, and the light distribution is changed during CCT ad¬ justment. For example, in an illuminating device, a luminous flux corresponding to the central first phosphor layer is 20 lm, and a luminous flux corresponding to the peripheral sec¬ ond phosphor layer is 46 lm, a light distribution pattern as shown in Fig. 1 can be obtained and a light ring is present. When the CCT is adjusted, if the luminous flux corresponding to the central first phosphor layer is kept to be 20 lm, and the luminous flux corresponding to the peripheral second phosphor layer is adjusted to be 23 lm, then the light dis¬ tribution pattern will be changed, as shown in Fig. 2, and the light ring still exists. Summary of the Invention
In order to solve the above problem, the first object of the present invention is to provide an illuminating device. By using such illuminating device, a fixed light distribution pattern can be obtained during CCT adjustment, and no light ring will appear.
The illuminating device according to the present invention comprises : a plurality of first LED chips covered by first phosphor layers, a plurality of second LED chips covered by second phosphor layers, and a circuit board for supporting the first and second LED chips, the first and second LED chips are tunable in brightness, and the first phosphor lay¬ ers and the second phosphor layers are alternately arranged.
The principle of the present invention lies in determining the positional relationships between the first and second phosphor layers, and corresponding first and second LED chips in an advantageous manner, and replacing the conventional "intensive" arrangement with the "staggered" arrangement. CCTs of the first emergent light from the first phosphor lay¬ ers and of the second emergent light from the second phosphor layers can be changed by adjusting brightness of the first LED chips and the second LED chips. Since light sources, i.e., the LED chips, are "staggered" to each other, and the phosphor layers corresponding thereto are also "staggered" to each other, light paths of resulted emergent light are also staggered to each other. Accordingly, the first emergent light and the second emergent light having different CCTs can be intensively mixed, the light distribution pattern of the illuminating device will not be changed during the CCT adjustment, and the generation of the light ring as mentioned in the Background Art will be avoided. The higher the density of the staggered LED chips is, the better the light mixing effect is.
According to a preferred solution of the present invention, wavelengths of lightwaves generated when the first phosphor layers and the second phosphor layers are excited are differ¬ ent. That is to say, types of the first and second phosphor layers are different, and thus, cold white light and warm white light can be obtained by exciting the two types of phosphor layers. According to a preferred solution of the present invention, the LED chips are blue LED chips, and the first phosphor lay- ers and the second phosphor layers are YAG phosphor layers. Such combination of the blue LED chips and the YAG phosphor layers is a mainstream design in the current LED field.
According to another preferred solution of the present inven- tion, the LED chips are UV LED chips, and the first phosphor layers and the second phosphor layers are RGB phosphor lay¬ ers. Such combination of the UV LED chips and the RGB phos¬ phor layers is a novel research orientation in the LED field.
According to a preferred solution of the present invention, the illuminating device further comprises a carrying frame, wherein the carrying frame has a frame and a plurality of partition ribs, the partition ribs divide a space defined by the frame into a plurality of carrying gaps, into which the first phosphor layers and the second phosphor layers can be filled, respectively. As a result, it is assured that the first phosphor layers and the second phosphor layers are cor¬ responding to the first LED chips and the second LED chips at fixed locations.
In a preferred solution of the present invention, the carry- ing gaps are stripped carrying gaps, each of which is in a form of stripe, are arranged to be parallel to each other, the first phosphor layer or the second phosphor layer in each gap covers the first LED chips or the second LED chips that are linearly arranged. Herein, emergent light from the illu- minating device is formed by mixture of a plurality of beams of stripped first and second emergent light. Since the stripped structure is simple, it is favorable to simplifying the manufacturing of the phosphor layers and reducing the cost. In order to obtain an optimal light mixing effect, the stripped carrying gaps preferably can have a uniform width. In another preferred solution of the present invention, the carrying gaps, each of which is in a form of grid, are arranged to be in a staggered arrangement, the first phosphor layer or the second phosphor layer in each gap covers one first LED chip or one second LED chip. Since the first and second phosphor layers are arranged to be, for instance, per¬ pendicular to each other and uniformly staggered, the generation of the light ring can be avoided to the greatest extent.
In another preferred solution of the present invention, the carrying gaps, each of which is in a form of ring, are arranged to be concentric with each other, and the first phos¬ phor layer or the second phosphor layer in each gap covers the first LED chips or the second LED chips that are annu- larly arranged. An ideal light mixing effect also can be ob- tained through the alternate arrangement of the first and second phosphor layers designed as concentric rings.
Preferably, the partition ribs and the frame are made in one piece. In one preferred embodiment, the frame is made of sil¬ ica gel. Such frame will not affect the illuminating effect of the illuminating device, and can fixedly keep the struc¬ ture of the alternate arrangement of the first and second phosphor layers, which facilitates to simplify the installa¬ tion of the illuminating device.
In another preferred solution of the present invention, the illuminating device further comprises an electrically insu¬ lating layer and a heat sink, the electrically insulating layer and the heat sink are in thermal contact, and one side of the electrically insulating layer carries the circuit board and the other side of the electrically insulating layer is mounted on the heat sink. Therefore, heat of the illumi¬ nating device can be well dissipated. In another preferred solution of the present invention, brightness of the plurality of first LED chips and the plu¬ rality of second LED chips is adjusted via a first driving current and a second driving current supplied by the circuit board, respectively. Thus, the CCTs of the first emergent light and the second emergent light can be simply adjusted, and further the CCT of the whole illuminating device is ad¬ justed to meet different application requirements.
In addition, the second object of the present invention is to provide a luminaire comprising the illuminating device above. A user can adjust the CCT of such luminaire in a situation of keeping the light distribution unchanged, and the illuminat¬ ing effect without a light ring can be obtained.
According to a preferred embodiment of the present invention, the luminaire also comprises a reflector mounted together with the illuminating device. Emergent light from the illuminating device thereby can be reflected by the reflector to improve the luminous efficacy of the luminaire.
Brief Description of the Drawings The accompanying drawings constitute a part of the present Description and are used to provide further understanding of the present invention. Such accompanying drawings illustrate the embodiments of the present invention and are used to de¬ scribe the principles of the present invention together with the Description. In the accompanying drawings the same compo¬ nents are represented by the same reference numbers. As shown in the drawings :
Fig. 1 is a first light distribution pattern according to the prior art; Fig. 2 is a second light distribution pattern according to the prior art ;
Fig. 3 is a 3D exploded view of a first embodiment of an il¬ luminating device according to the present invention; Fig. 4 is a schematic diagram of the assembled illuminating device shown in Fig. 3;
Fig. 5 is a schematic diagram of a second embodiment of the illuminating device according to the present invention;
Fig. 6 is a schematic diagram of a third embodiment of the illuminating device according to the present invention; and
Fig. 7 is a 3D view of a luminaire according to the present invention .
Detailed Description of the Embodiments
Fig. 3 is a 3D exploded view of a first embodiment of an il- luminating device 10 according to the present invention. The illuminating device 10 according to the present invention comprises first and second LED chips 1.1, 1.2, of which are tunable in brightness, and a circuit board 2, wherein the first and second LED chips 1.1, 1.2 are mounted on the cir- cuit board 2. In order to ensure a good heat dissipating ef¬ fect of the illuminating device 10, the circuit board 2 is equipped with an electrically insulating layer 7 and a heat sink 8, wherein one side of the electrically insulating layer 7 carries the circuit board 2 and the other side of the elec- trically insulating layer 7 is mounted on the heat sink 8 so as to realize thermal contact between the circuit board 2 and the heat sink 8. Particularly according to the present invention, the first LED chips 1.1 covered by first phosphor layers 5 and the sec¬ ond LED chips 1.2 covered by second phosphor layers 6 are the light sources of the illuminating device 10, and the first phosphor layers 5 and the second phosphor layers 6 are alter¬ nately arranged. The first phosphor layers 5 and the second phosphor layers 6 are different types of phosphor layers in the scope of the present invention, that is to say, first emergent light and second emergent light, such as cold white light and warm white light, having different wavelengths can be obtained by exciting the first and second phosphor layers 5, 6. During CCT adjustment, magnitudes of a first driving current and a second driving current supplied by the circuit board 2 to the first LED chips 1.1 and the second LED chips 1.2 are controlled, respectively, and thus the brightness of respective chip can be changed, so that the first emergent light and the second emergent light that are staggered in lo¬ cations can be intensively mixed to prevent generation of a light ring, and the light distribution pattern will not be changed with the CCT adjustment.
In order to assure that the first and the second LED chips 1.1, 1.2 are corresponding to the first and the second phos¬ phor layers 5, 6 at fixed locations, the illuminating device 10 further comprises a carrying frame 4 made of, for in- stance, silica gel, and the carrying frame 4 has a frame 4.1 and a plurality of partition ribs 4.2, and the frame 4.1 and the partition ribs 4.2 can be made in one piece. The parti¬ tion ribs 4.2 divide a space defined by the frame 4.1 into a plurality of carrying gaps R, into which the first phosphor layers 5 and the second phosphor layers 6 can be filled, re¬ spectively, at fixed locations.
It can be seen in conjunction with Fig. 4 that a plurality of first LED chips 1.1 are linearly arranged into a first col¬ umn, and a plurality of second LED chips 1.2 are correspond¬ ingly arranged into a second column, and the first column and the second column are alternately arranged. The first phos- phor layer 5 corresponding to the first LED chips 1.1 and the second phosphor layer 6 corresponding to the second LED chips 1.2 are also stripped and fixed in stripped carrying gaps R that are arranged to be parallel to each other. As a result, stripped first emergent light and second emergent light can be obtained. Since the first emergent light and the second emergent light are staggered and mixed into total emergent light of the illuminating device 10, the light distribution pattern can be kept unchanged during the CCT adjustment and no light ring will appear.
Fig. 5 is a schematic diagram of a second embodiment of the illuminating device 10 according to the present invention. A plurality of carrying gaps R are grid-shaped carrying gaps in a staggered arrangement, wherein solid boxes represent the first phosphor layers 5, corresponding to the first LED chips 1.1, accommodated in the carrying gaps R, and hollow boxes represent the second phosphor layers 6, corresponding to the second LED chips 1.2, accommodated in the carrying gaps R. In the present embodiment, the first and second LED chips 1.1, 1.2 are staggered with a high density, thereby compared with the alternate arrangement of the first and second LED chips 1.1, 1.2 that are linearly arranged in the first embodiment, a better light mixing effect can be obtained.
Fig. 6 is a schematic diagram of a third embodiment of the illuminating device 10 according to the present invention. A plurality of carrying gaps R are annular carrying gaps concentric with each other, and the first phosphor layer 5 or the second phosphor layer 6 in each annular carrying gap cov- ers the first LED chips 1.1 or the second LED chips 1.2 that are annularly arranged. As the annular first phosphor layers 5 and second phosphor layers 6 are concentrically alternately arranged, the annular first emergent light and second emer- gent light obtained thereby are also alternate, and similar to the first embodiment, the illuminating device 10 of this embodiment also can prevent generation of the light ring.
Fig. 7 shows a luminaire according to the present invention. The luminaire comprises the above illuminating device 10 and a reflector 9. In order to improve the luminous efficacy, the illuminating device 10 can be disposed on a bottom of the cup-shaped reflector 9. The CCT of such luminaire is tunable while the light distribution pattern is unchanged, and the luminaire has an illuminating effect without a light ring. The above is merely preferred embodiments of the present in¬ vention but not to limit the present invention. For the per¬ son skilled in the art, the present invention may have vari¬ ous alterations and changes. Any alterations, equivalent sub¬ stitutions, improvements, within the spirit and principle of the present invention, should be covered in the protection scope of the present invention.
List of reference 1 light source
1.1 first LED chip
1.2 second LED chip
2 circuit board
4 carrying frame
4.1 frame
4.2 partition rib
5 first phosphor layer
6 second phosphor layer
7 electrically insulating layer 8 heat sink
9 reflector
10 illuminating device
R carrying gap

Claims

Claims
1. An illuminating device (10), characterized in that com¬ prising : a plurality of first LED chips (1.1) covered by first phosphor layers (5), a plurality of second LED chips (1.2) covered by second phosphor layers (6), and a circuit board (2) for supporting the first and second LED chips (1.1, 1.2), the first and second LED chips (1.1, 1.2) are tunable in brightness, and the first phosphor layers (5) and the sec- ond phosphor layers (6) are alternately arranged.
2. The illuminating device (10) according to Claim 1, characterized in that wavelengths of lightwaves generated when the first phosphor layers (5) and the second phosphor layers (6) are excited are different.
3. The illuminating device (10) according to Claim 2, characterized in that the LED chips (1) are blue LED chips, and the first phosphor layers (5) and the second phosphor layers (6) are YAG phosphor layers.
4. The illuminating device (10) according to Claim 2, char- acterized in that the LED chips (1) are UV LED chips, and the first phosphor layers (5) and the second phosphor layers (6) are RGB phosphor layers.
5. The illuminating device (10) according to Claim 1 or 2, characterized by further comprising a carrying frame (4), wherein the carrying frame (4) has a frame (4.1) and a plu¬ rality of partition ribs (4.2), the partition ribs (4.2) divide a space defined by the frame (4.1) into a plurality of carrying gaps (R) , into which the first phosphor layers (5) and the second phosphor layers (6) can be filled, respec- tively .
6. The illuminating device (10) according to Claim 5, characterized in that the carrying gaps (R) , each of which is in a form of stripe, are arranged to be parallel to each other, the first phosphor layer (5) or the second phosphor layer (6) in each gap covers the first LED chips (1.1) or the second LED chips (1.2) that are linearly arranged.
7. The illuminating device (10) according to Claim 5, characterized in that the carrying gaps (R),each of which is in a form of grid, are arranged to be in a staggered arrangement, the first phosphor layer (5) or the second phosphor layer (6) in each gap covers one first LED chip (1.1) or one second LED chip (1.2) .
8. The illuminating device (10) according to Claim 5, char- acterized in that the carrying gaps (R) , each of which is in a form of ring, are arranged to be concentric with each other, and the first phosphor layer (5) or the second phos¬ phor layer (6) in each gap covers the first LED chips (1.1) or the second LED chips (1.2) that are annularly arranged.
9. The illuminating device (10) according to Claim 5, characterized in that the partition ribs (4.2) and the frame (4.1) are made in one piece.
10. The illuminating device (10) according to Claim 5, characterized in that the frame (4) is made of silica gel.
11. The illuminating device (10) according to Claim 1 or 2, characterized in that the illuminating device further com¬ prises an electrically insulating layer (7) and a heat sink (8), the electrically insulating layer (7) and the heat sink (8) are in thermal contact, and one side of the electrically insulating layer (7) carries the circuit board (2) and the other side of the electrically insulating layer (7) is mounted on the heat sink (8) .
12. The illuminating device (10) according to Claim 1, characterized in that brightness of the plurality of first LED chips (1.1) and the plurality of second LED chips (1.2) is adjusted via a first driving current and a second driving current supplied by the circuit board (2), respectively.
13. A luminaire comprising the illuminating device (10) ac¬ cording to any one of Claims 1-12.
14. The luminaire according to Claim 13, characterized by further comprising a reflector (9) mounted together with the illuminating device (10).
PCT/EP2013/054034 2012-03-01 2013-02-28 Illuminating device and luminaire comprising the illuminating device WO2013127923A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210052293.9 2012-03-01
CN2012100522939A CN103292163A (en) 2012-03-01 2012-03-01 Lighting device and lamp comprising same

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WO2013127923A1 true WO2013127923A1 (en) 2013-09-06

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CN105020606A (en) * 2015-07-01 2015-11-04 杨觐聪 LED lamp for automatically adjusting color temperature

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