EP2325547A1 - 360-degree angle LED illumination device - Google Patents
360-degree angle LED illumination device Download PDFInfo
- Publication number
- EP2325547A1 EP2325547A1 EP09174470A EP09174470A EP2325547A1 EP 2325547 A1 EP2325547 A1 EP 2325547A1 EP 09174470 A EP09174470 A EP 09174470A EP 09174470 A EP09174470 A EP 09174470A EP 2325547 A1 EP2325547 A1 EP 2325547A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- base plate
- degree angle
- copper base
- led
- illumination device
- 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.)
- Withdrawn
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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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
- F21V29/89—Metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
-
- 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
- F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
- F21Y2107/30—Light sources with three-dimensionally disposed light-generating elements on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
-
- 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
- F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
- F21Y2107/60—Light sources with three-dimensionally disposed light-generating elements on stacked substrates
-
- 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 present invention relates to a LED (light-emitting diode) illumination device and, more particularly, to a 360-degree angle LED illumination device capable of providing 360 degree illumination range and advantageous of having lower manufacturing cost and improved the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips while having.
- a plurality of LEDs are arranged on the same plane of a main body to form a conventional LED illumination device in order to provide wider illumination range and better illumination intensity.
- LEDs light-emitting diodes
- planar type LED illumination devices it is able to obtain 180-degree illumination range after the LEDs are driven.
- 180-degree illumination range can be achieved by means of above LED arrangement, the practical illumination effect provided by above LED illumination devices is not ideal.
- two planar type LED illumination devices are combined to form a new device, the illumination range of which is over 360 degrees.
- the inventor had the motive to study and develop the present invention. After hard research and development, the inventor provides a 360-degree angle LED illumination device capable of providing 360-degree angle illumination range and advantageous in having lower manufacturing cost and having improved thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use.
- An object of the present invention is to provide a 360-degree angle LED (light-emitting diode) illumination device, which is formed by arranging plural LED chips on the peripheries of a single copper base plate. Thereby, LED chips are able to illuminate in different angle ranges in order to achieve 360-degree angle illumination range.
- Another object of the present invention is to provide a 360-degree angle LED illumination device, where the copper base plate is electroplated with a layer of silver thereon.
- the thermal conductivity and heat dissipation capability can be improved in order to prolong the lifetime of the LED chips in use while keep manufacturing cost low.
- the present invention provides a 360-degree angle LED illumination device comprising a copper base plate, a plurality of LED chips, and a flexible PCB circuit layer.
- the copper base plate is electroplated with a layer of silver thereon.
- the plurality of LED chips is provided on the peripheries of the copper base plate.
- the flexible PCB circuit layer is provided on the peripheries of the copper base plate and electrically connected with the LED chips for controlling the LED chips. Accordingly, it is able to provide 360-degree angle illumination range and to improve the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use effectively.
- the copper base plate is preferably in octagonal shape and four lateral sides thereof are respectively provided with a LED chip.
- Fig. 1 shows a perspective view of a first embodiment of a 360-degree angle LED illumination device of the present invention.
- Fig. 2 shows a perspective view of a second embodiment of a 360-degree angle LED illumination device of the present invention.
- Fig. 3 is a schematic view showing the use of the 360-degree angle LED illumination device in the second embodiment of the present invention.
- the present invention discloses a 360-degree angle LED (light-emitting diode) illumination device comprising a copper base plate, a plurality of LED chips, and a flexible PCB circuit layer.
- the plurality of LED chips is provided on the peripheries of the copper base plate.
- the flexible PCB circuit layer is provided on the peripheries of the copper base plate and electrically connected with the LED chips for controlling the LED chips.
- the 360-degree angle LED illumination device 1 comprises a copper base plate 10, four LED chips 12, four covers 14, and a flexible PCB circuit layer 16.
- the copper base plate 10 is in octagonal shape and is electroplated with a layer of silver thereon for obtain optimal thermal conductivity and heat dissipation capability.
- copper and silver are used as the material to solve the problem regarding thermal conductivity and heat dissipation.
- the thermal conductivity coefficient of copper is 380W/m.K while the thermal conductivity coefficient of silver is 429W/m.K. Accordingly, silver has better thermal conductivity when compared with copper. However, copper is much cheaper than silver.
- the copper is used as a core for thermal conductivity and heat dissipation and silver is electroplated on the surface of the core made of copper.
- copper and silver are used to form an alloy whose thermal conductivity is between those of copper and silver. Accordingly, better thermal conductivity and hear dissipation capability can be achieved while the cost can be kept low.
- the thermal conductivity coefficient of the copper base plate electroplated with a layer of silver is about 420W/m.K. That is, the thermal conductivity of the copper base plate electroplated with a layer of silver is almost the same with that of silver while the cost of the electroplated copper base plate is much cheaper than that of silver. Besides, in addition to the better thermal conductivity and hear dissipation capability, the silver electroplated on the copper base plate is also able to provide reflection effect that is beneficial to increase effective luminous flux.
- LED chips are able to illuminate in different angle ranges. Therefore, it is able to obtain 360-degree angle illumination range and decrease dead angles effectively.
- the flexible PCB circuit layer 16 is provided on the peripheries of the copper base plate 10 and electrically connected with the LED chips 12 for controlling the LED chips 12.
- Figs.2 and 3 showing a second embodiment of the present invention.
- the structure of the copper base plate 10' is altered.
- the copper base plate 10' is further provided with a hole 104 centrally.
- plural 360-degree angle LED illumination devices can be strung to form a new illumination devices. Accordingly, various illumination devices composed of plural 360-degree angle LED illumination devices can be formed in response to different requirements from consumers.
- the present invention has following advantages:
- the present invention can provide a 360-degree angle LED illumination device capable of providing 360-degree illumination range and advantageous in having improved the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use while keeping the manufacturing cost low. It is new and can be put into industrial use.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Led Device Packages (AREA)
Abstract
A 360-degree angle LED (light-emitting diode) illumination device (1) comprises a copper base plate (10), a plurality of LED chips (12), and a flexible PCB circuit layer (16). The copper base plate is electroplated with a layer of silver thereon. The plurality of LED chips is provided on the peripheries of the copper base plate. The flexible PCB circuit layer is provided on the peripheries of the copper base plate and electrically connected with the LED chips for controlling the LED chips. Accordingly, it is able to provide 360-degree angle illumination range and to improve the thermal conductivity and heat dissipation capability in order to prolong effectively the lifetime of the LED chips in use.
Description
- The present invention relates to a LED (light-emitting diode) illumination device and, more particularly, to a 360-degree angle LED illumination device capable of providing 360 degree illumination range and advantageous of having lower manufacturing cost and improved the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips while having.
- Typically, a plurality of LEDs (light-emitting diodes) are arranged on the same plane of a main body to form a conventional LED illumination device in order to provide wider illumination range and better illumination intensity. By using above planar type LED illumination devices, it is able to obtain 180-degree illumination range after the LEDs are driven.
- Although 180-degree illumination range can be achieved by means of above LED arrangement, the practical illumination effect provided by above LED illumination devices is not ideal. In order to widen the illumination range, two planar type LED illumination devices are combined to form a new device, the illumination range of which is over 360 degrees.
- However, it is also disadvantageous in several aspects to combine two planar type LED illumination devices mentioned hereinabove.
- First of all, dead angles still exist even two planar type LED illumination devices are combined and it is unable to achieve 360-degree angle illumination range. Second, the assembling cost for combining two planar type LED illumination devices is greatly increased. Besides, assembling two planar type LED illumination devices not only requires highly complicated and difficult technical skills but also takes much longer time. Moreover, the yield of the devices produced by assembling two planar type LED illumination devices is low as well.
- In order to overcome above shortcomings, inventor had the motive to study and develop the present invention. After hard research and development, the inventor provides a 360-degree angle LED illumination device capable of providing 360-degree angle illumination range and advantageous in having lower manufacturing cost and having improved thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use.
- An object of the present invention is to provide a 360-degree angle LED (light-emitting diode) illumination device, which is formed by arranging plural LED chips on the peripheries of a single copper base plate. Thereby, LED chips are able to illuminate in different angle ranges in order to achieve 360-degree angle illumination range.
- Another object of the present invention is to provide a 360-degree angle LED illumination device, where the copper base plate is electroplated with a layer of silver thereon. Thereby, the thermal conductivity and heat dissipation capability can be improved in order to prolong the lifetime of the LED chips in use while keep manufacturing cost low.
- In order to achieve above objects, the present invention provides a 360-degree angle LED illumination device comprising a copper base plate, a plurality of LED chips, and a flexible PCB circuit layer. The copper base plate is electroplated with a layer of silver thereon. The plurality of LED chips is provided on the peripheries of the copper base plate. The flexible PCB circuit layer is provided on the peripheries of the copper base plate and electrically connected with the LED chips for controlling the LED chips. Accordingly, it is able to provide 360-degree angle illumination range and to improve the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use effectively.
- In practice, the copper base plate is preferably in octagonal shape and four lateral sides thereof are respectively provided with a LED chip.
- The following detailed description, given by way of examples or embodiments, will best be understood in conjunction with the accompanying drawings.
-
Fig. 1 shows a perspective view of a first embodiment of a 360-degree angle LED illumination device of the present invention. -
Fig. 2 shows a perspective view of a second embodiment of a 360-degree angle LED illumination device of the present invention. -
Fig. 3 is a schematic view showing the use of the 360-degree angle LED illumination device in the second embodiment of the present invention. - The present invention discloses a 360-degree angle LED (light-emitting diode) illumination device comprising a copper base plate, a plurality of LED chips, and a flexible PCB circuit layer. The plurality of LED chips is provided on the peripheries of the copper base plate. The flexible PCB circuit layer is provided on the peripheries of the copper base plate and electrically connected with the LED chips for controlling the LED chips.
- Please refer to
Fig. 1 showing a first embodiment of a 360-degree angle LED illumination device of the present invention. In this embodiment, the 360-degree angleLED illumination device 1 comprises acopper base plate 10, fourLED chips 12, fourcovers 14, and a flexiblePCB circuit layer 16. - Besides, in this embodiment, the
copper base plate 10 is in octagonal shape and is electroplated with a layer of silver thereon for obtain optimal thermal conductivity and heat dissipation capability. - Heat will be inevitably produced when LED chips are used. If the produced heat is unable to dissipate effectively, the temperature of the LED chips will be elevated accordingly, which may shorten the lifetime of the LED chips. In order to solve this problem and prolong the lifetime of LED chips, metal is typically used to dissipate produced heat because of good thermal conductivity and heat dissipation capability.
- In this embodiment, copper and silver are used as the material to solve the problem regarding thermal conductivity and heat dissipation. The thermal conductivity coefficient of copper is 380W/m.K while the thermal conductivity coefficient of silver is 429W/m.K. Accordingly, silver has better thermal conductivity when compared with copper. However, copper is much cheaper than silver.
- Therefore, in the present invention, the copper is used as a core for thermal conductivity and heat dissipation and silver is electroplated on the surface of the core made of copper. In other words, copper and silver are used to form an alloy whose thermal conductivity is between those of copper and silver. Accordingly, better thermal conductivity and hear dissipation capability can be achieved while the cost can be kept low.
- In practice, the thermal conductivity coefficient of the copper base plate electroplated with a layer of silver is about 420W/m.K. That is, the thermal conductivity of the copper base plate electroplated with a layer of silver is almost the same with that of silver while the cost of the electroplated copper base plate is much cheaper than that of silver. Besides, in addition to the better thermal conductivity and hear dissipation capability, the silver electroplated on the copper base plate is also able to provide reflection effect that is beneficial to increase effective luminous flux.
- Besides, four lateral sides of the
copper base plate 10 respectively form a receivingpart 102 for placing aLED chip 12 thereon. Moreover, Each LED chip is covered with acover 14. By the arrangement of the LED chips, LED chips are able to illuminate in different angle ranges. Therefore, it is able to obtain 360-degree angle illumination range and decrease dead angles effectively. - In this embodiment, the flexible
PCB circuit layer 16 is provided on the peripheries of thecopper base plate 10 and electrically connected with theLED chips 12 for controlling theLED chips 12. - Please refer to
Figs.2 and3 showing a second embodiment of the present invention. The only difference between these two embodiments is that the structure of the copper base plate 10' is altered. As shown inFig.2 , the copper base plate 10' is further provided with ahole 104 centrally. By means of this design, as shown inFig.3 , plural 360-degree angle LED illumination devices can be strung to form a new illumination devices. Accordingly, various illumination devices composed of plural 360-degree angle LED illumination devices can be formed in response to different requirements from consumers. - Therefore, the present invention has following advantages:
- 1. By arranging a plurality of LED chips on the peripheries of a single copper base plate, it is able to obtain 360-degree angle illumination range while effectively decrease dead angles.
- 2. The alloy formed by electroplating a layer of silver on the surface of a copper base plate has ideal thermal conductivity and heat dissipation capability and low manufacturing cost.
- 3. By electroplating a layer of silver on the surface of a copper base plate, the electroplated silver can provide better reflection effect in order to increase the effective luminous flux.
- 4. By providing the copper base plate with a hole, it is able to string plural 360-degree angle LED illumination devices to form a new illumination device with better illumination effect.
- As disclosed in the above description and attached drawings, the present invention can provide a 360-degree angle LED illumination device capable of providing 360-degree illumination range and advantageous in having improved the thermal conductivity and heat dissipation capability in order to prolong the lifetime of the LED chips in use while keeping the manufacturing cost low. It is new and can be put into industrial use.
- Although the embodiments of the present invention have been described in detail, many modifications and variations may be made by those skilled in the art from the teachings disclosed hereinabove. Therefore, it should be understood that any modification and variation equivalent to the spirit of the present invention be regarded to fall into the scope defined by the appended claims.
Claims (6)
- A 360-degree angle LED (light-emitting diode) illumination device, comprising:a copper base plate, electroplated with a layer of silver;a plurality of LED chips, provided on the peripheries of the copper base plate; anda flexible PCB circuit layer, provided on the peripheries of the copper base plate and electrically connected with the LED chips for controlling the LED chips.
- The 360-degree angle LED illumination device as claimed in claim 1, wherein the copper base plate is in octagonal shape and four lateral sides thereof are provided with a LED chip respectively.
- The 360-degree angle LED illumination device as claimed in claim 2, wherein each LED chip is further covered by a cover.
- The 360-degree angle LED illumination device as claimed in claim 2, wherein the copper base plate is further provided with an opening centrally.
- The 360-degree angle LED illumination device as claimed in claim 1, wherein each LED chip is further covered by a cover.
- The 360-degree angle LED illumination device as claimed in claim 1, wherein the copper base plate is further provided with an opening centrally.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09174470A EP2325547A1 (en) | 2009-10-29 | 2009-10-29 | 360-degree angle LED illumination device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09174470A EP2325547A1 (en) | 2009-10-29 | 2009-10-29 | 360-degree angle LED illumination device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2325547A1 true EP2325547A1 (en) | 2011-05-25 |
Family
ID=41694782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09174470A Withdrawn EP2325547A1 (en) | 2009-10-29 | 2009-10-29 | 360-degree angle LED illumination device |
Country Status (1)
Country | Link |
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EP (1) | EP2325547A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8401682B2 (en) | 2000-10-12 | 2013-03-19 | Bose Corporation | Interactive sound reproducing |
WO2018091283A1 (en) * | 2016-11-15 | 2018-05-24 | Philips Lighting Holding B.V. | Lighting device, lighting device element, and processes for the production thereof. |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050146884A1 (en) * | 2004-01-07 | 2005-07-07 | Goodrich Hella Aerospace Lighting Systems Gmbh | Light, particularly a warning light, for a vehicle |
US20050168985A1 (en) * | 2004-02-02 | 2005-08-04 | Chen Chia Y. | Light device having changeable light members |
US20070081340A1 (en) * | 2005-10-07 | 2007-04-12 | Chung Huai-Ku | LED light source module with high efficiency heat dissipation |
US20080123340A1 (en) * | 2006-11-27 | 2008-05-29 | Mcclellan Thomas | Light device having LED illumination and electronic circuit board in an enclosure |
EP1937041A2 (en) * | 2006-12-21 | 2008-06-25 | LG Electronics Inc. | Printed circuit board, light emitting apparatus having the same and manufacturing method thereof |
WO2009013771A1 (en) * | 2007-07-25 | 2009-01-29 | Intav S.R.L. | Lighting device, in particular light signalling supplementary device for rescue and emergency prioritary vehicles |
DE102008004799A1 (en) * | 2007-12-14 | 2009-06-25 | Hänsch Warnsysteme GmbH | Rotating flashing beacon, particularly revolving signal light for use as blue light for special operation vehicles, has socket, partially transparent hood, and lamp that is formed from multiple light-emitting diodes |
-
2009
- 2009-10-29 EP EP09174470A patent/EP2325547A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050146884A1 (en) * | 2004-01-07 | 2005-07-07 | Goodrich Hella Aerospace Lighting Systems Gmbh | Light, particularly a warning light, for a vehicle |
US20050168985A1 (en) * | 2004-02-02 | 2005-08-04 | Chen Chia Y. | Light device having changeable light members |
US20070081340A1 (en) * | 2005-10-07 | 2007-04-12 | Chung Huai-Ku | LED light source module with high efficiency heat dissipation |
US20080123340A1 (en) * | 2006-11-27 | 2008-05-29 | Mcclellan Thomas | Light device having LED illumination and electronic circuit board in an enclosure |
EP1937041A2 (en) * | 2006-12-21 | 2008-06-25 | LG Electronics Inc. | Printed circuit board, light emitting apparatus having the same and manufacturing method thereof |
WO2009013771A1 (en) * | 2007-07-25 | 2009-01-29 | Intav S.R.L. | Lighting device, in particular light signalling supplementary device for rescue and emergency prioritary vehicles |
DE102008004799A1 (en) * | 2007-12-14 | 2009-06-25 | Hänsch Warnsysteme GmbH | Rotating flashing beacon, particularly revolving signal light for use as blue light for special operation vehicles, has socket, partially transparent hood, and lamp that is formed from multiple light-emitting diodes |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8401682B2 (en) | 2000-10-12 | 2013-03-19 | Bose Corporation | Interactive sound reproducing |
WO2018091283A1 (en) * | 2016-11-15 | 2018-05-24 | Philips Lighting Holding B.V. | Lighting device, lighting device element, and processes for the production thereof. |
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