CN104565889A - Spiral LED assembly and LED bulb lamp using same - Google Patents
Spiral LED assembly and LED bulb lamp using same Download PDFInfo
- Publication number
- CN104565889A CN104565889A CN201310500452.1A CN201310500452A CN104565889A CN 104565889 A CN104565889 A CN 104565889A CN 201310500452 A CN201310500452 A CN 201310500452A CN 104565889 A CN104565889 A CN 104565889A
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- China
- Prior art keywords
- helical form
- led
- strip member
- led component
- spiral
- 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.)
- Pending
Links
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 claims description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 239000011889 copper foil Substances 0.000 claims description 16
- 238000007639 printing Methods 0.000 claims description 14
- 238000005530 etching Methods 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
- F21V19/0015—Fastening arrangements intended to retain light sources
- F21V19/002—Fastening arrangements intended to retain light sources the fastening means engaging the encapsulation or the packaging of the semiconductor device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/001—Arrangement of electric circuit elements in or on lighting devices the elements being electrical wires or cables
- F21V23/002—Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention provides a spiral LED assembly which comprises a bar-shaped component, an LED chip and a conductive wire graph. The bar-shaped component winds around a central shaft to form a spiral shape. The LED chip is arranged on the surface of the spiral bar-shaped component in an encapsulated or attached mode. The conductive wire graph is formed on the bar-shaped component so as to be electrically connected with the LED chip. Sections on the same side of the spiral bar-shaped component are arranged at certain intervals in a staggered mode along the axis direction of the central shaft, so that other sections cannot be blocked. In addition, the invention further provides an LED bulb lamp using the spiral LED assembly.
Description
Technical field
The present invention relates to lighting engineering, particularly relate to a kind of helical form LED component and use its LED to steep shape lamp.The light emitting anger of the illumination effect that helical form LED component of the present invention can make its LED bubble shape light fixture have incandescent lamp screw lamp thread and full light beam.
Background technology
For general lighting, outward appearance is similar to conventional incandescent bulb, adopts standard lamp head and the LED bulb be built-in with for the electric drive parts of LED module work popularized in lighting field.
This LED bulb take Fig. 1 as mainstream product.
In Fig. 1,1-1 is LED module; 1-2 is the electric drive parts for LED module constant current or constant voltage work; 1-3 is heat conduction and thermal component, doubles as the housing into lamp; 1-4 is printing opacity cell-shell; 1-5 is standard lamp head.
The LED bulb of prior art is all based on a tabular LED layout, and owing to being limited by the unidirectional of LED module, being less than the light emitting anger technology of 160 degree, it is luminous that bulb is only front end (L), makes the purposes of product and popularization receive restriction.
In electric vacuum technology, very universal compact helical fluorescent lamp tube such as the Fig. 2 of a kind of use is had to illustrate.As shown in Figure 2,2-1 is the filament being coated with electron emission material; 2-2 be fluorescent tube vacuumize stem stem; 2-3 is that wire drawn by filament; 2-4 is glass tube, and inwall is coated with fluorescent material.Input the voltage x current through ballast, compact helical fluorescent lamp tube is luminous in vacuum state work.
Summary of the invention
The illumination effect that shape lamp can simulate traditional spiral fluorescent lamp is steeped for making LED.Main feature of the present invention is by the aluminium matter of an elongate strip or the copper pcb board covering Copper Foil, through being etched into conduction line chart, on the substrate of elongate strip, based on conduction line chart, and attachment or packaging LED chips; Attachment or be packaged with LED chip facing to outside, be rolled into cylindric or circular cone column, and circle volume between do not block, form a kind of spiral helicine LED component; Spiral helicine LED component inputs constant voltage x current supply LED chip, the light emitting anger that helical form LED component has the thread illumination effect of incandescent lamp screw lamp and full light beam can be obtained.
According to an aspect of the present invention, provide a kind of helical form LED component, be applicable to LED and steep shape lamp, comprising:
Strip member, described strip member is wound into helical form around central shaft;
LED chip, encapsulates or is mounted on the outer surface of spiral helicine strip member; And
Conduction line chart, is formed on described strip member to be electrically connected described LED chip;
Wherein, described spiral helicine strip member each section on the same side to offset one from another predetermined space along the axis direction of described central shaft, not block other sections.
Preferably, in above-mentioned helical form LED component, described strip member is made up of the pcb board containing copper foil layer, and wherein said copper foil layer forms described conduction line chart through etching, plating spray or printing.
Preferably, in above-mentioned helical form LED component, described LED chip encapsulates or is mounted on the outer surface of spiral helicine strip member.
Preferably, in above-mentioned helical form LED component, described helical form is columnar spiral or conical spiral.
Preferably, in above-mentioned helical form LED component, described strip member is vertical bar shaped or U-shaped.
Preferably, in above-mentioned helical form LED component, described helical form is the contrary spiral in single-screw, double helix or direction.
Preferably, in above-mentioned helical form LED component, described spiral helicine strip member is left-handed or dextrorotation.
Preferably, in above-mentioned helical form LED component, also comprise: pipe, be arranged among described spiral helicine strip member along described central shaft, wherein, the two ends of described pipe are respectively arranged with slot, insert wherein with the two ends holding described spiral helicine strip member respectively.
According to a further aspect in the invention, provide a kind of LED and steep shape lamp, there is the helical form LED component described in above-mentioned arbitrary claim, electric drive parts, printing opacity cell-shell, thermal component, lamp housing and standard lamp head, wherein, standard lamp head is positioned at the bottom that LED steeps shape lamp, lamp housing is arranged between standard lamp head and printing opacity cell-shell, wherein, described helical form LED component is positioned at the center of printing opacity cell-shell, and be connected to form heat transfer with thermal component, described electronic driver is positioned at described lamp housing and provides constant voltage x current value to described helical form LED component, make the LED chip work of described helical form LED component luminous.
Should be appreciated that more than the present invention generality describe and the following detailed description be all exemplary and explanat, and be intended to for as claimed in claim the invention provides further explanation.
Accompanying drawing explanation
Comprising accompanying drawing is further understand the present invention for providing, and they are included and form a application's part, and accompanying drawing shows embodiments of the invention, and plays the effect explaining the principle of the invention together with this description.In accompanying drawing:
Fig. 1 schematically shows the LED bulb of prior art.
Fig. 2 shows a kind of compact helical fluorescent lamp tube of prior art.
Fig. 3 shows in detail the original deployed condition of the strip member 300 in helical form LED component of the present invention.
Fig. 4 a and Fig. 4 b respectively illustrates encapsulation and the mounting method of LED chip.
Fig. 5 a and Fig. 5 b shows two preferred embodiments according to spiral helicine LED component of the present invention.
Fig. 6 a and Fig. 6 b shows the structure of LED component according to a preferred embodiment of the present invention.
Fig. 7 a to Fig. 7 c shows a kind of winding method of preferred strip member.
Fig. 8 a and Fig. 8 b shows strip member according to another embodiment of the present invention.
Fig. 9 shows and steeps shape lamp according to LED of the present invention.
Detailed description of the invention
With detailed reference to accompanying drawing, embodiments of the invention are described now.Now with detailed reference to the preferred embodiments of the present invention, its example is shown in the drawings.In the case of any possible, in all of the figs the identical mark of use is represented same or analogous part.In addition, although the term used in the present invention selects from public term, but some terms mentioned in description of the present invention may be that applicant selects by his or her judgement, its detailed meanings illustrates in the relevant portion of description herein.In addition, require not only to pass through used actual terms, but the meaning that also will be contained by each term understands the present invention.
First the original deployed condition of the strip member 300 in helical form LED component of the present invention is shown in detail with reference to figure 3, Fig. 3.For convenience of description, in this description, the 3-1 of elongate strip is called end, 3-2 is called afterbody.In Fig. 3,3-3 is the conduction line chart through etching, it encapsulates or has mounted LED chip and made LED chip obtain the signal all conducted.Be appreciated that and the integrated mode of stamping-out can be utilized to form this strip member 300.In addition, in figure 3, the +/-solder joint of power input 3-4 is located at afterbody 3-2.Certainly, power input 3-4 also can be located at end 3-1 and afterbody 3-2 respectively, and without prejudice to general principle of the present invention.
This strip member 300 is preferably made up of the pcb board containing copper foil layer, and wherein copper foil layer forms conductor wire Fig. 3-3 through etching, plating spray or printing, and such as this pcb board can be base material with aluminum material, cover the PCB plain film being pressed with insulating barrier and copper foil layer.In addition, the pcb board of this component 300 can be aluminium matter pcb board, also can with copper.Or this pcb board also can be flexible base board, more preferably to realize bending.In addition, a kind of heat-conducting substrate not covering Copper Foil, through plating spray or printed conductive metal material, forms the pcb board manufacture craft of conduction line chart, because of production process more environmental protection and preferably being adopted by this patent.And on heat-conducting substrate, sticking flexible cover Copper Foil PCB thin slice, and preferably to be adopted by this patent.
LED can electrically connect by Copper Foil line chart, and the LED that every bar elongate strip seals is electrically connected conducting each other.
Fig. 4 a and Fig. 4 b respectively illustrates encapsulation and the mounting method of LED chip.
Such as, chip directly can be put with the technology mode of chip on board (Chip On Board, COB) and be welded on conductor wire Fig. 3-3 of such as Copper Foil by LED chip, then seals up phosphor gel, this mode is defined as " encapsulation ", as shown in fig. 4 a in this patent.
Such as, also can put with the LED particle 4-1 encapsulated and be welded on Copper Foil conduction line chart, in this patent, this mode is defined as " attachment ", as shown in Figure 4 b.
According to the present invention, the strip member 300 shown in above Fig. 3 is required to be wound into helical form around central shaft, and LED chip is encapsulated or is mounted on the outer surface of spiral helicine strip member, wherein spiral helicine strip member each section on the same side to offset one from another predetermined space along the axis direction of described central shaft, not block other sections.Such as, Fig. 5 a and Fig. 5 b shows two embodiments according to spiral helicine LED component of the present invention.
Such as, shown in Fig. 5 a and Fig. 5 b, preferably LED chip is sealed on the surface outwardly of strip member 300, then helical coil circle, thus the LED component of the cylindric spiral obtained as shown in Figure 5 a or cone cylindrical helical as shown in Figure 5 b.
Like this, by inputting through constant voltage x current value at power input 3-4, helical form LED component of the present invention just can obtain the light emitting anger with the thread illumination effect of incandescent lamp screw lamp and full light beam.
In addition, the helical form in the present invention can be the contrary spiral in single-screw, double helix or direction.
Forward now Fig. 6 a and Fig. 6 b to, it illustrates the structure of LED component according to a preferred embodiment of the present invention.Fig. 6 a is the side view of this LED component, and Fig. 6 b is the top view of this LED component.As shown in figures 6 a and 6b, spiral helicine LED component join one section of pipe 6-1 at cental axial position, in the corresponding slot on the pipe 6-1 then inserted by the end 3-1 of helical form LED component and afterbody 3-2.In reality is implemented, such structure can make helical form LED component obtain better heat conduction and support.
According to the present invention, described elongate strip, in vertical bar.More preferably, the sight effect of undaform vertical bar can be better.
Another kind of preferred embodiment such as Fig. 7 illustrates.In the figure 7, the aluminium matter of elongate strip is covered Copper Foil PCB substrate such as Fig. 7 a and is illustrated, in Fig. 7 a, the end 7-1 of elongate strip is positioned at the middle part of elongate strip, and afterbody is then two end 7-2,7-3 of elongate strip.The half of the LED of encapsulation or attachment is positioned at the 7-4 place, position of left half section, and second half is positioned at the 7-5 place, position on half section, the right side at the back side.More preferably, left half section and right half section respective one, positive and negative device, cost can be more economical.With end 7-1 for fixing point, by afterbody 7-2 circle volume to the right, afterbody 7-3 is circle volume left, curl, as the helical form LED component that Fig. 7 b and Fig. 7 c illustrates.Certainly, this patent does not limit the direction of rotation of spiral.Such as, this spiral helicine strip member can be left-handed, also can be dextrorotation.
Fig. 8 a and Fig. 8 b shows strip member according to another embodiment of the present invention, and the strip member of this structure may be used for manufacturing powerful helical form LED component.
As shown in Figure 8 a, the aluminium matter of elongate strip is covered Copper Foil PCB substrate and is punched into " U " shape.Equally, U-shaped substrate surface can etch Copper Foil conduction line chart and be sealed with LED chip.Preferably according to the mode shown in Fig. 8 b, this U-shaped substrate circle is rolled up, form helical form LED component 800.
Fig. 9 gives a kind of LED according to the present invention and steeps shape lamp.As can be seen from Figure 9, this LED bubble shape lamp 900 has incandescent lamp profile.
This LED steeps shape lamp 900 can have employed above-mentioned any one helical form LED component 9-1, and comprises electric drive parts (not shown), printing opacity cell-shell 9-2, thermal component 9-4, lamp housing 9-5 and standard lamp head 9-6 further.
Helical form LED component 9-1 is placed in the middle part of printing opacity cell-shell 12-2.The pipe 6-1 of support member 9-3(such as shown in Fig. 6 a or the support member of other types) support this helical form LED component 9-1 and do to coordinate with the thermal component 9-4 of lamp body and connect, to fix this helical form LED component, and the heat that helical form LED component can be made operationally to send is conducted by thermal component and is cooled.
Standard lamp head 9-6 is positioned at the bottom that LED steeps shape lamp, and lamp housing 9-5 is arranged between standard lamp head 9-6 and printing opacity cell-shell 9-2.This comb LED component 9-1 is positioned at the center of printing opacity cell-shell 9-2, and be connected to form heat transfer with thermal component 9-4, institute's electronic driver is positioned at lamp housing 9-5 and provides constant voltage x current value to comb LED component 9-1, makes the LED chip work of this comb LED component 9-1 luminous.
Above-mentioned LED steeps shape lamp and just provides an example, the application of helical form LED component of the present invention, not by the restriction of the shape of bubble shape lamp.
Those skilled in the art can be obvious, can carry out various modifications and variations and without departing from the spirit and scope of the present invention to above-mentioned exemplary embodiment of the present invention.Therefore, be intended to that the present invention is covered and drop within the scope of appended claims and equivalent arrangements thereof to amendment of the present invention and modification.
Claims (9)
1. a helical form LED component, is applicable to LED and steeps shape lamp, it is characterized in that, comprising:
Strip member, described strip member is wound into helical form around central shaft;
LED chip, encapsulates or is mounted on the surface of spiral helicine strip member; And
Conduction line chart, is formed on described strip member to be electrically connected described LED chip;
Wherein, described spiral helicine strip member each section on the same side to offset one from another predetermined space along the axis direction of described central shaft, not block other sections.
2. helical form LED component as claimed in claim 1, is characterized in that, described strip member is made up of the pcb board containing copper foil layer, and wherein said copper foil layer forms described conduction line chart through etching, plating spray or printing.
3. helical form LED component as claimed in claim 2, is characterized in that, described LED chip encapsulates or is mounted on the outer surface of spiral helicine strip member.
4. helical form LED component as claimed in claim 1, it is characterized in that, described helical form is columnar spiral or conical spiral.
5. helical form LED component as claimed in claim 1, it is characterized in that, described strip member is vertical bar shaped or U-shaped.
6. helical form LED component as claimed in claim 1, it is characterized in that, described helical form is the contrary spiral in single-screw, double helix or direction.
7. helical form LED component as claimed in claim 1, it is characterized in that, described spiral helicine strip member is left-handed or dextrorotation.
8. helical form LED component as claimed in claim 1, is characterized in that, also comprise:
Pipe, is arranged among described spiral helicine strip member along described central shaft,
Wherein, the two ends of described pipe are respectively arranged with slot, insert wherein with the two ends holding described spiral helicine strip member respectively.
9. LED steeps a shape lamp, it is characterized in that having the helical form LED component described in above-mentioned arbitrary claim, electric drive parts, printing opacity cell-shell, thermal component, lamp housing and standard lamp head,
Wherein, standard lamp head is positioned at the bottom that LED steeps shape lamp, and lamp housing is arranged between standard lamp head and printing opacity cell-shell,
Wherein, described helical form LED component is positioned at the center of printing opacity cell-shell, and being connected to form heat transfer with thermal component, described electronic driver is positioned at described lamp housing and provides constant voltage x current value to described helical form LED component, makes the LED chip work of described helical form LED component luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310500452.1A CN104565889A (en) | 2013-10-22 | 2013-10-22 | Spiral LED assembly and LED bulb lamp using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310500452.1A CN104565889A (en) | 2013-10-22 | 2013-10-22 | Spiral LED assembly and LED bulb lamp using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104565889A true CN104565889A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310500452.1A Pending CN104565889A (en) | 2013-10-22 | 2013-10-22 | Spiral LED assembly and LED bulb lamp using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104565889A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098050A (en) * | 2015-09-11 | 2015-11-25 | 葛铁汉 | Multi-level luminous light-emitting diode (LED) substrate |
| CN105387356A (en) * | 2015-12-23 | 2016-03-09 | 佛山赛威光电技术有限公司 | Controllable initiatively-radiating type LED lamp core |
| EP3726935A1 (en) * | 2019-04-18 | 2020-10-21 | Leedarson Lighting Co., Ltd. | Lighting apparatus |
| EP3742041A1 (en) * | 2019-05-23 | 2020-11-25 | Leedarson Lighting Co., Ltd | Light bulb apparatus |
| WO2020239655A1 (en) * | 2019-05-29 | 2020-12-03 | Signify Holding B.V. | Lighting device comprising a light emitting filament |
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| WO2012013605A2 (en) * | 2010-07-30 | 2012-02-02 | Osram Ag | Cooling device and led lighting device comprising the same |
| CN102537735A (en) * | 2011-12-31 | 2012-07-04 | 江苏三显照明科技有限公司 | LED lamp |
| CN102966868A (en) * | 2012-10-23 | 2013-03-13 | 浙江九阳光电有限公司 | Novel light-emitting diode (LED) lighting lamp |
| CN203500927U (en) * | 2013-10-22 | 2014-03-26 | 上海德士电器有限公司 | Spiral LED assembly and LED bulb lamp using same |
-
2013
- 2013-10-22 CN CN201310500452.1A patent/CN104565889A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012013605A2 (en) * | 2010-07-30 | 2012-02-02 | Osram Ag | Cooling device and led lighting device comprising the same |
| WO2012013605A3 (en) * | 2010-07-30 | 2012-03-29 | Osram Ag | Cooling device and led lighting device comprising the same |
| CN102537735A (en) * | 2011-12-31 | 2012-07-04 | 江苏三显照明科技有限公司 | LED lamp |
| CN102966868A (en) * | 2012-10-23 | 2013-03-13 | 浙江九阳光电有限公司 | Novel light-emitting diode (LED) lighting lamp |
| CN203500927U (en) * | 2013-10-22 | 2014-03-26 | 上海德士电器有限公司 | Spiral LED assembly and LED bulb lamp using same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098050A (en) * | 2015-09-11 | 2015-11-25 | 葛铁汉 | Multi-level luminous light-emitting diode (LED) substrate |
| CN105387356A (en) * | 2015-12-23 | 2016-03-09 | 佛山赛威光电技术有限公司 | Controllable initiatively-radiating type LED lamp core |
| EP3726935A1 (en) * | 2019-04-18 | 2020-10-21 | Leedarson Lighting Co., Ltd. | Lighting apparatus |
| EP3742041A1 (en) * | 2019-05-23 | 2020-11-25 | Leedarson Lighting Co., Ltd | Light bulb apparatus |
| WO2020239655A1 (en) * | 2019-05-29 | 2020-12-03 | Signify Holding B.V. | Lighting device comprising a light emitting filament |
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Application publication date: 20150429 |