WO2013107731A1

WO2013107731A1 - Illuminating device and luminaire having the illuminating device

Info

Publication number: WO2013107731A1
Application number: PCT/EP2013/050653
Authority: WO
Inventors: Hui GUI; Tingbiao LAN; Chengyang LUO; Jin Hu
Original assignee: Osram Gmbh
Priority date: 2012-01-18
Filing date: 2013-01-15
Publication date: 2013-07-25
Also published as: CN103216741B; CN103216741A

Abstract

The present invention relates to an illuminating device (100), comprising a first light-emitting assembly (1), a second light-emitting assembly (1') and a heat dissipating device (2), wherein the heat dissipating device (2) comprises a first heat sink (21) and a second heat sink (22) provided to surround the first heat sink (21), the first light-emitting assembly (1) and the second light-emitting assembly (1') are arranged on a top surface (23) and a bottom surface (24) of the second heat sink (22), respectively, and the first heat sink (21) is provided with a reflector for the first light- emitting assembly (1) and the second light-emitting assembly (1'). The illuminating device of the present invention has the advantage of a good illuminating effect, especially realizing the omnidirectional illumination, and also has the advantages of a simple structure, a low cost and prominently improved heat dissipating capabilities.

Description

Illuminating Device and Luminaire Having the Illuminating Device

Technical Field

The present invention relates to an illuminating device and a luminaire having the illuminating device.

Background Art With the development of the illuminating technology, the om^¬ nidirectional illuminating device gradually becomes a new field of research. Among the known omnidirectional illuminat^¬ ing devices, they either have a complicated cooling structure and arranged with a lot of LEDs on the surface of the illumi- nating device in an all-enclosed manner, or have a remote phosphor bulb, or have a light guiding structure, or have a reflective structure mounted inside the bulb.

Though the omnidirectional illuminating devices of the above types basically can achieve the expected illuminating effect, the manufacturing cost or material cost is quite high. The brightness of the omnidirectional illuminating devices can be improved by elevating the power of the light source, but in the inside of an illuminating device, a lot of heat also will be generated by the light-emitting module. If timely and ef- fective cooling measures cannot be used for the illuminating device, the service lifetime might be affected. How to cool the omnidirectional illuminating devices in a reasonable man^¬ ner while the brightness thereof can be assured has become an urgent problem to be addressed in the illuminating technol- ogy. Summary of the Invention

Therefore, the object of the present invention lies in pro^¬ viding an illuminating device that can overcome the defects of various prior solutions and has the advantages of a simple structure, an easy manufacturing technology, good illuminat^¬ ing effects and prominently improved heat dissipating capa^¬ bilities.

An illuminating device is provided according to the present invention, comprising a first light-emitting assembly, a sec- ond light-emitting assembly and a heat dissipating device, wherein the heat dissipating device comprises a first heat sink and a second heat sink provided to surround the first heat sink, the first light-emitting assembly and the second light-emitting assembly are arranged on a top surface and a bottom surface of the second heat sink, respectively, and the first heat sink is provided with a reflector for the first light-emitting assembly and the second light-emitting assembly. By means of the first light-emitting assembly and the second light-emitting assembly arranged at both sides and the reflector arranged on the first heat sink, wide-angle illumi^¬ nation can be realized with a simple structure, and the heat dissipating capabilities of the illuminating device are also guaranteed .

Preferably, the reflector is configured to be capable of re- fleeting light in directions of 360°. The function of omnidi^¬ rectional illumination of the illuminating device is there^¬ fore assured.

Preferably, the first heat sink has an air passage provided to pass through the first heat sink so as to realize convec- tive heat dissipation. In one preferred solution of the present invention, the first heat sink has a circumferential wall that defines the air passage, and the reflector is an outer surface of the circum^¬ ferential wall configured to be a reflective surface. The circumferential wall defines in the inside the air passage for heat dissipation, which serves the function of dissipating heat. As the outer surface of the circumferential wall is configured to be a reflective surface, it has the function of a reflector to adjust the light directions. Therefore, the first heat sink simultaneously serves the function of dissi^¬ pating heat and adjusting the light directions.

Preferably, the reflective surface is configured to be a free concave surface. The profile and curve of the free concave surface can be adjusted by taking locations of the light- emitting assemblies and expected light distributions into consideration so as to adjust light to various expected di^¬ rections .

Preferably, the reflective surface comprises an upper reflec^¬ tive surface and a lower reflective surface separated by the second heat sink for the first light-emitting assembly and the second light-emitting assembly, respectively. In view of the locations where the first light-emitting assembly and the second light-emitting assembly are arranged, the upper re^¬ flective surface and the lower reflective surface can meet requirements to light distribution of light from the first light-emitting assembly and the second light-emitting assembly, respectively, so as to satisfy the final requirement to omnidirectional illumination.

Preferably, an inner surface of the circumferential wall has a plurality of cooling ribs distributed in a circumferential direction and extending in a longitudinal direction. The heat dissipating area can be increased by providing a plurality of cooling ribs; thereby the heat exchange capabilities of air in the heat dissipating device and the air passage are im^¬ proved . In one preferred solution of the present invention, the air passage includes a chimney passage located in an upper part for achieving a chimney effect and an air guiding passage lo^¬ cated in a lower part. The chimney passage in the upper part can discharge hot air as soon as possible, and the air guid- ing passage in the lower part can help to guide cold air from the outside as much as possible so as to satisfy the big heat dissipating requirements of the illuminating device.

In one preferred solution of the present invention, the circumferential wall has a first portion protruding upwards the second heat sink and a second portion protruding downwards the second heat sink, and the chimney passage is de^¬ fined by the first portion, and the air guiding passage is defined by the second portion. The second heat sink is used to separate the first heat sink into the first portion pro- truding upwards and the second portion protruding downwards. The first portion above the second heat sink defines the chimney passage to realize quick rising and discharge of the hot air. The second portion defines the air guiding passage to guide air downwards. Preferably, the first portion is configured to be a section with a big diameter at two ends and a small diameter in the middle, and the second portion is configured to a trumpet section with a diameter gradually becoming bigger from top to bottom, and the first portion and the second portion are in a smooth transition. The configuration of the first portion, namely, two ends having a big diameter and the middle having a small diameter, is favorable for achieving a good chimney effect; and the second portion as the trumpet section with the diameter gradually becoming bigger helps to guide air and allow the air to rise. Preferably, the second portion of the circumferential wall is opened with a plurality of first ventilation openings dis^¬ tributed in a circumferential direction at a lower end, and the first portion of the circumferential wall defines a sec^¬ ond ventilation opening at an upper end. The first ventila- tion openings act as air inlets or air outlets and the second ventilation opening acts as an air outlet or an air inlet so as to communicate air with the air passage for realizing good heat dissipation. According to the principle that hot air rises all the time, when the illuminating device is placed to have the first ventilation openings located in an upper part and the second ventilation opening located in a lower part, the second ventilation opening is an air inlet and the first ventilation holes are air outlets. And when the illuminating device in use is reversed, that is, the second ventilation opening is located in the upper part and the first ventila^¬ tion holes are located in the lower part, the first ventila^¬ tion holes are air inlets, and the second ventilation hole is air outlet.

Preferably, the first heat sink and the second heat sink are made in one piece, as a result, the process is simplified and the cost is reduced.

In one preferred solution of the present invention, the first light-emitting assembly and the second light-emitting assembly each comprise an annular circuit board with an opening and a plurality of LED chips distributed in a circumferential direction on the annular circuit board, and the annular cir- cuit boards are inserted with on the first heat sink via the openings and mounted on the second heat sink. Therefore, heat generated by the light-emitting assemblies not only can be transferred to the first heat sink, but also can be trans- ferred to the second heat sink. In addition, this configura^¬ tion facilitates the light-emitting assemblies to be mounted on the top surface and the bottom surface of the second heat sink for realizing the omnidirectional illumination.

Preferably, the LED chips are uniformly arranged and symmet- rical with respect to the first heat sink so as to realize uniform illumination.

Preferably, the illuminating device further comprises a first cover body and a second cover body arranged between the first heat sink and the second heat sink, and the first cover body and the second cover body define enclosed cavities with the first heat sink and the second heat sink, respectively, for enclosing the first light-emitting assembly and the second light-emitting assembly, respectively. In this situation, only the upper end and the lower end of the first heat sink are exposed, while the other portions are enclosed by the first cover body and the second cover body. Of course, in other substituent embodiments, the first cover body and the second cover body also can fully enclose the heat dissipating device . Preferably, both the first cover body and the second cover body have a spherical-crown shape, which results in an illu^¬ minating device pleasing on the whole with a good streamline form.

The present invention further relates to a luminaire compris- ing the illuminating device having the above characteristics. Preferably, the luminaire is a retrofit lamp.

The illuminating device and the luminaire according to the present invention have the advantages of a simple manufactur^¬ ing technology, a low cost, good illumination effects and prominently improved heat dissipating capabilities.

It shall be understood that both the above general descrip^¬ tion and the following detailed description are for illustrative and explanative purposes in order to provide further de^¬ scriptions of the present claimed invention. 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 3D view of an illuminating device of a first ex- emplary embodiment of the present invention;

Fig. 2 is a front view of the illuminating device of the first exemplary embodiment of the present invention;

Fig. 3 is a top view of the illuminating device of the first exemplary embodiment of the present invention; Fig. 4 is a section view obtained along A-A line in Fig. 2; Fig. 5 is a first 3D view of the illuminating device of the first exemplary embodiment of the present invention when cover bodies are removed; and

Fig. 6 is a second 3D view of the illuminating device of the first exemplary embodiment of the present invention when the cover bodies are removed.

Detailed Description of the Embodiments

Fig. 1 is a 3D view of an illuminating device 100 of the first exemplary embodiment of the present invention. Fig. 2 is a front view of the illuminating device 100 of the first exemplary embodiment of the present invention. The illuminat^¬ ing device 100 in this embodiment is an omnidirectional illu^¬ minating device. It can be seen from conjunction of Fig. 1 and Fig. 2 that the illuminating device 100 comprises a first cover body 3 and a second cover body 4. The illuminating de^¬ vice 10 further comprises a first heat sink 21 and a second heat sink 22. The first cover body 3 and the second cover body 4 are arranged between the first heat sink 21 and the second heat sink 22 and enclose most of the first heat sink 21 and the second heat sink 22. In other embodiments, the first heat sink 21 and the second heat sink 22 also can be fully enclosed. A lower end of the first heat sink 21 that is not enclosed by the first cover body 3 and the second cover body 4 is opened with a plurality of first ventilation open- ings 27. The illuminating device 100 further comprises an electrical connecting portion 6 for electrical connection and a driver housing 5 connected with the lower end of the first heat sink 21.

Fig. 3 is a top view of the illuminating device 100 of the first exemplary embodiment of the present invention. It can be seen therefrom that a second ventilation opening 28 is opened at a top end of the illuminating device 100 for an air passage 25. Moreover, a plurality of cooling ribs 29 are pro^¬ vided on an inner wall of the first heat sink 21. Fig. 4 is a section view obtained along A-A line in Fig. 2. The inner structure enclosed by the first cover body 3 and the second cover body 4 can be seen clearly from Fig. 4. The illuminating device 100 comprises a first light-emitting as^¬ sembly 1 and a second light-emitting assembly 1', and further comprises a heat dissipating device 2. In this preferred em^¬ bodiment, the heat dissipating device 2 comprises the first heat sink 21 and the second heat sink 2 that are made in one piece. The first heat sink 21 has a circumferential wall that defined the air passage 25. An outer surface of the circum- ferential wall is a curved surface that can be a reflective surface to be used as a reflector for adjusting light direc^¬ tions. For the sake of omnidirectional illumination, the first light-emitting assembly 1 and the second light-emitting assembly 1' are provided. The second heat sink 22 is a collar enclosing the first heat sink 21, and the first light- emitting assembly 1 and the second light-emitting assembly 1' are mounted on a top surface 23 and a bottom surface 24 of the collar, respectively, so as to realize the concept of ar^¬ ranging the light-emitting assemblies at both sides and achieve the omnidirectional illumination. The second heat sink 22 separates the curved surface of the first heat sink 21 into an upper reflective surface configured to cooperate with the first light-emitting assembly 1 and a lower reflec^¬ tive surface configured to cooperate with the second light- emitting assembly 1'. The upper reflective surface and the lower reflective surface can be free concave surfaces, and profiles of the upper reflective surface and the lower re^¬ flective surface can be adjusted, according to the condition of the light-emitting assemblies, to realize better illuminating effects.

The first light-emitting assembly 1 and the second light- emitting assembly 1' each comprise an annular circuit board 11 with an opening and a plurality of LED chips 12 distrib^¬ uted in a circumferential direction on the annular circuit board 11. The annular circuit boards 11 are inserted with on the first heat sink 21 via the openings and further mounted on the second heat sink 22 surrounding the first heat sink 21. In order to realize better illuminating effects, the LED chips 12 are arranged uniformly on the annular circuit boards 11 in a circumferential direction and symmetrical with re^¬ spect to the first heat sink 21.

Similarly, the second heat sink 22 separates the circumferen- tial wall of the first heat sink 21 into a first portion 211 protruding upwards the second heat sink 22 and a second por^¬ tion 212 protruding downwards the second heat sink 22. For effective heat dissipation, the air passage 25 includes two portions from top to bottom, namely, a chimney passage 251 located in an upper part for achieving a chimney effect and an air guiding passage 252 located in a lower part for guiding air. Thus, in the present embodiment, the first portion 211 is configured to be a section with a big diameter at two ends and a small diameter in the middle. It can be seen from Fig. 4 that the diameter of the first portion starts to be continuously reduced gradually from the second ventilation opening 28 up to a section with a minimum diameter, and then starts to continuously increase gradually from the section with the minimum diameter. The second portion 212 is con- nected with an end of the first portion 211 and forms into a trumpet section with a diameter gradually becoming bigger from the end of the first portion 211. The air guiding pas- sage 252 sucks cold air from the first ventilation openings 27 and heat generated by the first and second light-emitting assemblies 1, 1 ' is absorbed by the circumferential wall and then is transferred to the cold air. The cold air gradually is heated and become hot air. The hot air rises and enters into the chimney passage 251. Due to the chimney effect of the chimney passage 251, hot air is quickly discharged from the second ventilation opening 28.

The first heat sink 21 has a locking portion 213 at a lower end for engagement with the driver housing 5. As the first heat sink 21 and the second heat sink 22 of the present in^¬ vention have good heat dissipating effects by using the chimney passage 251 and the air guiding passage 252, Apart from the cooling ribs 29 which are arranged in the inner surface of circumferential wall , it is unnecessary to provide other ribs, which thus saves the space occupied by the heat dissi^¬ pating device and provides a big space for the driver housing 5.

Fig. 5 is a first 3D view of the illuminating device 100 of the first exemplary embodiment of the present invention when the cover bodies are removed; and Fig. 6 is a second 3D view of the illuminating device 100 of the first exemplary embodi^¬ ment of the present invention when the cover bodies are re^¬ moved. The second light-emitting assembly 1' located on the bottom surface 24 of the second heat sink 22 is seen from

Fig. 5. The second light-emitting assembly 1' comprises the annular circuit board 11 and a plurality of LED chips 12 dis^¬ tributed uniformly on the annular circuit board 11 in a circumferential direction. The first light-emitting assembly 1 located on the top surface 23 of the second heat sink 22 is seen from Fig. 6. The first light-emitting assembly 1 comprises the annular circuit board 11 and a plurality of LED chips 12 distributed uniformly on the annular circuit board 11 in a circumferential direction. When the illuminating device 100 of the present invention is assembled, the first light-emitting assembly 1 can be firstly mounted on the top surface 23. The second light-emitting assembly 1' can be di^¬ vided into two semi-annular portions, correspondingly, the annular circuit board 11 is also divided into two semi- annular portions, and then the two semi-annular portions of the second light-emitting assembly 1' are arranged on the two semi-annular portions of the annular circuit board 11, re^¬ spectively, so as to form a complete annular shape. Thereaf^¬ ter, the first cover body 3 and the second cover body 4 are mounted between the first heat sink 21 and the second heat sink 22, respectively, to define enclosed cavities for en- closing the first light-emitting assembly 1 and the second light-emitting assembly 1', respectively.

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.

₁

List of reference signs

100 illuminating device

1 light-emitting assembly 11 annular circuit board

12 LED chip

2 heat dissipating device

21 first heat sink

211 first portion

212 second portion

213 locking portion

22 second heat sink

23 top surface

24 bottom surface

25 air passage

251 chimney passage

252 air guiding passage 26 outer surface first ventilation opening second ventilation opening cooling rib

driver housing

electrical connecting portion

Claims

1. An illuminating device (100), characterized by compris^¬ ing a first light-emitting assembly (1), a second light- emitting assembly (1') and a heat dissipating device (2), wherein the heat dissipating device (2) comprises a first heat sink (21) and a second heat sink (22) provided to sur^¬ round the first heat sink (21), the first light-emitting as^¬ sembly (1) and the second light-emitting assembly (1') are arranged on a top surface (23) and a bottom surface (24) of the second heat sink (22), respectively, and the first heat sink (21) is provided with a reflector for the first light- emitting assembly (1) and the second light-emitting assembly d' ) .

2. The illuminating device (100) according to Claim 1, characterized in that the reflector is configured to be capa^¬ ble of reflecting light in directions of 360°.

3. The illuminating device (100) according to Claim 2, characterized in that the first heat sink (21) has an air passage (25) provided to pass through the first heat sink (21) .

4. The illuminating device (100) according to Claim 3, characterized in that the first heat sink (21) has a circum^¬ ferential wall that defines the air passage (25) , and the re- flector is an outer surface (26) of the circumferential wall as a reflective surface.

5. The illuminating device (100) according to Claim 4, characterized in that the reflective surface is configured to be a free concave surface.

6. The illuminating device (100) according to Claim 4, characterized in that the reflective surface comprises an up^¬ per reflective surface and a lower reflective surface sepa^¬ rated by the second heat sink (2) for the first light- emitting assembly (1) and the second light-emitting assembly (1')/ respectively.

7. The illuminating device (100) according to Claim 4, characterized in that an inner surface of the circumferential wall has a plurality of cooling ribs (29) distributed in a circumferential direction and extending in a longitudinal di^¬ rection .

8. The illuminating device (100) according to Claim 4, characterized in that the air passage (25) includes a chimney passage (251) located in an upper part for achieving a chim- ney effect and an air guiding passage (252) located in a lower part.

9. The illuminating device (100) according to Claim 8, characterized in that the circumferential wall has a first portion (211) protruding from the second heat sink (22) up- wards and a second portion (212) protruding from the second heat sink (22) downwards, and the chimney passage (251) is defined by the first portion (211) and the air guiding pas^¬ sage (252) is defined by the second portion (212) .

10. The illuminating device (100) according to Claim 9, characterized in that the first portion (211) is configured to be a section with a big diameter at two ends and a small diameter in a middle, and the second portion (212) is configured to a trumpet section with a diameter gradually becoming bigger from top to bottom, and the first portion (211) and the second portion (212) are in a smooth transition.

11. The illuminating device (100) according to Claim 9, characterized in that the second portion (212) of the circum^¬ ferential wall is opened with a plurality of first ventila^¬ tion openings (27) distributed in a circumferential direction at a lower end for the air passage (25) , and the first por^¬ tion (211) of the circumferential wall defines a second ven^¬ tilation opening (28) at an upper end for the air passage (25) .

12. The illuminating device (100) according to Claim 3, characterized in that the first heat sink (21) and the second heat sink (22) are made in one piece.

13. The illuminating device (100) according to any one of Claims 1-12, characterized in that the first light-emitting assembly (1) and the second light-emitting assembly (1') each comprise an annular circuit board (11) with an opening and a plurality of LED chips (12) distributed in a circumferential direction on the annular circuit board (11), and the annular circuit boards (11) are inserted with the first heat sink (21) via the openings and arranged on the second heat sink (22) .

14. The illuminating device (100) according to Claim 13, characterized in that the LED chips (12) are arranged symmet^¬ rical with respect to the first heat sink (21) .

15. The illuminating device (100) according to any one of Claims 1-12, characterized by further comprising a first cover body (3) and a second cover body (4) arranged between the first heat sink (21) and the second heat sink (22), and the first cover body (3) and the second cover body (4) define enclosed cavities with the first heat sink (21) and the sec- ond heat sink (22), respectively, for enclosing the first light-emitting assembly (1) and the second light-emitting assembly (1') , respectively.

16. The illuminating device (100) according to Claim 15, characterized in that both the first cover body (3) and the second cover body (4) have a spherical-crown shape.

17. A luminaire comprising the illuminating device (100) ac^¬ cording to any one of Claims 1-16.

18. The luminaire according to Claim 17, wherein the luminaire is a retrofit lamp.