CN204026210U - Filament LED bulb - Google Patents
Filament LED bulb Download PDFInfo
- Publication number
- CN204026210U CN204026210U CN201420343131.5U CN201420343131U CN204026210U CN 204026210 U CN204026210 U CN 204026210U CN 201420343131 U CN201420343131 U CN 201420343131U CN 204026210 U CN204026210 U CN 204026210U
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- China
- Prior art keywords
- led
- transparent pipe
- bulb
- filament
- emitting component
- 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.)
- Expired - Fee Related
Links
- 229910052751 metal Inorganic materials 0.000 claims description 30
- 239000002184 metal Substances 0.000 claims description 30
- 239000011521 glass Substances 0.000 claims description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- 229910052754 neon Inorganic materials 0.000 claims description 3
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005622 photoelectricity Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 230000000875 corresponding effect Effects 0.000 description 5
- 239000010453 quartz Substances 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The utility model is a kind of filament LED bulb, comprise interior heat sink, described interior heat sinkly made by transparent pipe, the outer surface of transparent pipe or inner surface are provided with LED light-emitting component.The utility model adopts transparent pipe as interior heat sink, LED light-emitting component is contained on transparent pipe, the heat that many LED light-emitting components are produced dispels the heat by combinations such as heat conduction, heat radiation and thermal convection currents, reach the effect of cooling, solve the bad problem of traditional heat sink heat radiation, effectively ensured the photoelectricity indexs such as luminous efficiency, light sustainment rate and the life-span of the filament LED bulb that uses transparent assembling.
Description
Technical field
The utility model relates to a kind of LED lighting technical field, particularly a kind of filament LED bulb.
Background technology
Adopt the LED lamp bar of COB encapsulation to be assembled in clear lamp cell-shell some, the so-called filament LED bulb of making, not only have the warm tones colour temperature identical with conventional incandescent, and its luminous efficiency and index of aging be considerably beyond the index of incandescent lamp, after replacing, energy-saving efficiency is remarkable.
The LED bulb that uses 2 to 4 filament LED assemblings, is filled with inert gas in bulb housing in it.Inert gas has not only been protected the luminous of LED own, and has reduced the temperature of LED by convection effect, and light efficiency reaches 120Lm/W left and right, the conventional incandescent of alternative 15w-40w.But test shows, when using when more than 6 or 6 filament LED is assembled into LED bulb, luminous efficiency has declined 10 ~ 20%, and reason is that the convection current of inert gas has been not enough to take away more heat; Along with the increase of LED lamp bar encapsulation number, the heat radiation contradiction of whole lamp is more aobvious outstanding, and light efficiency will further decline, and be difficult to substitute the conventional incandescent of the above power of the more 60w of use amount.
Utility model patent " lighting device of cast primitive LED and cast primitive LED composition " (Chinese utility model patent number: ZL2008 1 0093558.3) is enclosed LED lamp bar in the glass tube of respective diameters; LED transparent luminescent substrate is close to glass tube inwall; in glass tube, be filled with nitrogen or the inert gas of enough pressure simultaneously; by heat radiation and thermal convection current effect, the heat that LED is produced passes to glass tube; And the glass tube with high surface area more conducts by heat and dissipation of heat is gone out in thermal convection current again, so not only further reduce the temperature of LED lamp bar, and in outside bulb shell, can be air.But the heat dissipation capacity of cast primitive LED is limited by the limited diameter (being surface area) of glass tube, if further do not taked cooling measure to be also difficult to make more high-power LED bulb.
Summary of the invention
Technical problem to be solved in the utility model is for the deficiencies in the prior art, and a kind of heat sink (heat radiation) problem that can solve conventional art is provided, and improves the filament LED bulb of the combination properties such as luminous efficiency, light sustainment rate and life-span.
Technical problem to be solved in the utility model is to realize by following technical scheme, the utility model is a kind of filament LED bulb, be characterized in: comprise interior heat sink, described interior heat sinkly made by transparent pipe, the outer surface of transparent pipe or inner surface are provided with LED light-emitting component.The quantity of the LED light-emitting component of installing is even number.
In described filament LED bulb, described LED light-emitting component is cast primitive LED or LED lamp bar.
In described filament LED bulb, described LED light-emitting component with every two series connection again mode parallel with one another be connected, the electric wire of every two series connection turns down and is close on the tube wall of transparent pipe to the another side of LED light-emitting component installed surface, with the lower end of fixed L ED light-emitting component.
In described filament LED bulb, described transparent pipe is glass tube or plastic tube, and the aperture of transparent pipe is 2-200mm, wall thickness is 0.1-10mm, its length is corresponding with the length of LED light-emitting component, is slightly larger than the length and the length sum of inserting in lamp socket of LED light-emitting component, and length is 10-300mm.Its surface area size and wall thickness have determined the size of heat sink (heat radiation) ability, determine the different capacity of bulb.Glass tube can be that quartz glass tube, borosilicate glass tube, microcrystal glass tube or common soda-lime glass etc. are applicable to glass of the present utility model.
In described filament LED bulb, described transparent pipe is cone-shaped or column, its cross section be shaped as circle, ellipse, triangle or polygon.Therefore its upper and lower diameter can be identical or different, and wall thickness also can be inhomogeneous.
In described filament LED bulb, the surface of described transparent pipe has the groove equating with LED light-emitting component quantity, and LED light-emitting component embeds in groove.LED light-emitting component embeds wherein, not only LED light-emitting component is fixed, and also increases thus heat conducting contact-making surface; Transparent pipe by having a high surface area more to surrounding radiation, further reduces the temperature rise of LED light-emitting component by heat.
In described filament LED bulb, described groove is uniformly distributed along the circumferential direction of transparent pipe.
In described filament LED bulb, described groove be shaped as circular arc, trapezoidal or rectangle, when groove is circular arc, its diameter is 0.3mm～15mm, and is slightly larger than the external diameter of LED light-emitting component.
In described filament LED bulb, described LED light-emitting component is cast primitive LED, described bulb comprises lamp holder, lamp socket and bulb housing, lamp holder is fixed on lamp socket upper end, bulb housing is arranged on lamp socket lower end, lamp socket is provided with some passages, insert in lamp socket the upper end of described transparent pipe, lamp socket inner chamber is divided into inner cavity chamber and outer chamber two parts, aforementioned passage is located at respectively on inner cavity chamber and lamp socket wall corresponding to outer chamber, between described transparent pipe and inboard wall of lamp holder, be provided with the convection holes that is communicated with transparent pipe outer space and lamp socket outer chamber, cast primitive LED is along the outer surface of transparent pipe or being axially arranged on transparent tube wall or groove of inner surface.
Cast primitive LED is closely mounted on transparent pipe surface by the utility model, and jointly form gaseous exchange system with bulb housing, lamp socket.After lighting a lamp, in transparent pipe, outside forms the temperature difference, and then in forming from lamp socket inner cavity chamber or outer chamber to transparent pipe outer space again to the thermal-convection loop to lamp socket outer chamber or inner cavity chamber, thereby reduce the temperature rise of cast primitive LED, the heat that many cast primitive LED are produced is sent to outside bulb housing by number of ways such as heat conduction, heat radiation and thermal convection currents, solve heat sink (heat radiation) problem of conventional method, the combination properties such as effective luminous efficiency, light sustainment rate and life-span that ensures the bulb of assembling.
In described filament LED bulb, described lamp holder is connected with external power, and LED driving power is housed in lamp holder, and the output of LED driving power is connected with the total electric wire that stretches into the cast primitive LED in lamp socket.
Can also be provided with the micro-recesses of fixing cast primitive LED series connection lead-in wire in the port, one end of transparent pipe, prevent that series connection lead-in wire from shaking, and can not well turn down.
In described filament LED bulb, insert in lamp socket by metal ring the upper end of described transparent pipe, the outer ring surface of metal ring and lamp socket lower port place inwall closely cooperate, and its inner ring surface closely cooperates with the outer wall of transparent pipe, and described convection holes is located on metal ring.
In described filament LED bulb, when described cast primitive LED is located on transparent pipe outer surface, the inner ring surface of above-mentioned metal ring is provided with the fixed groove one to one with cast primitive LED.Fixed groove can be semicircle orifice, the slightly larger in diameter of semicircle orifice is in the external diameter of cast primitive LED, both fixed thus one end of cast primitive LED, make again cast primitive LED be close to the outer surface of transparent pipe, so the heat of cast primitive LED can be transmitted to metal ring and have on the transparent pipe of larger thermal capacity and surface area, reaching the object that reduces cast primitive LED temperature by heat radiation.When described cast primitive LED is located on transparent pipe inner surface, can be fixed by elastic fixing clamp.
In described filament LED bulb, described LED light-emitting component is LED lamp bar, described bulb comprises lamp holder, lamp holder below is fixed with metal lamp holder, metal lamp holder is quite with outer heat sink, the lower end of metal lamp holder is connected with bulb housing, filling with inert gas in bulb housing, described transparent pipe is located in bulb housing, its top is located on the inwall of metal lamp holder, and be close to inwall, and can heat be left by metal lamp holder by heat conducting mode like this, LED lamp bar is located on the transparent tube wall or groove of metal lamp holder below.
In described filament LED bulb, described metal lamp holder is aluminium alloy lamp socket.
In described filament LED bulb, described inert gas is half atmospheric neon.
Compared with prior art, the utility model adopts transparent pipe as interior heat sink, LED light-emitting component is contained on transparent pipe, the heat that many LED light-emitting components are produced dispels the heat by combinations such as heat conduction, heat radiation and thermal convection currents, reach the effect of cooling, solve the bad problem of traditional heat sink heat radiation, effectively ensured the photoelectricity indexs such as luminous efficiency, light sustainment rate and the life-span of the filament LED bulb that uses transparent assembling.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the bulb made of cast primitive LED.
Fig. 2 is a kind of structural representation of transparent pipe.
The another kind of structural representation of Fig. 3 transparent pipe.
The another kind of structural representation of Fig. 4 transparent pipe.
The another kind of structural representation of Fig. 5 transparent pipe.
Fig. 6 is a kind of structural representation of the bulb made of LED lamp bar.
Detailed description of the invention
Referring to accompanying drawing, further describe concrete technical scheme of the present utility model, so that those skilled in the art understands the utility model further, and do not form the restriction to its right.
Embodiment 1: as shown in Figure 1, for the filament LED bulb that cast primitive LED is arranged on the transparent pipe that has semi-circular groove is implemented schematic diagram.Transparent pipe is made up of quartz glass tube, hereinafter to be referred as quartzy transparent pipe.A kind of filament LED bulb, comprises lamp holder 6, plastic lamp base 4 and glass bulb shell 7, and lamp holder 6 is fixed on plastic lamp base 4 upper ends, and glass bulb shell 7 is arranged on plastic lamp base 4 lower ends, and driving power is built in lamp holder 6.LED light-emitting component is cast primitive LED1, and the external diameter of cast primitive LED1 is 3.2mm, and long is 53mm.And have a quartzy transparent pipe 2 of the semi-circular groove 11 as shown in Fig. 2,3,4 and 5, the external diameter of quartz transparent pipe 2 is 25mm, wall thickness 2.0mm, length is 69mm, evenly have along its circumferential direction 8 semi-circular grooves 11 that diameter is 3.25mm, cast primitive LED1 embeds in semi-circular groove 11.Quartz transparent pipe 2 upper ends are inserted in the interior work of lamp socket 4 heat sink by metal ring 3, lamp socket 4 inner chambers are divided into inner cavity chamber and outer chamber two parts by quartz transparent pipe 2, some passages are located at respectively on inner cavity chamber and lamp socket wall corresponding to outer chamber, can be provided with uniformly a circle along lamp socket 4 circumferential direction, passage on the lamp socket wall corresponding with inner cavity chamber is 5', its diameter is 2.5mm, and the passage on the lamp socket wall corresponding with outer chamber is 5, and diameter is 3mm.Above-mentioned metal ring 3 is aluminum alloy materials, the thickness of metal ring 3 is 1.2mm, internal diameter is 25.2mm, the inwall of the external diameter of metal ring 3 and lamp socket 4 closely cooperates, on metal retainer ring 3, there is the convection holes 10 that is communicated with transparent pipe 2 outer space and lamp socket outer chamber, the diameter of convection holes 10 is 2.5mm, and convection holes 10 is circumferentially evenly provided with 16 along metal ring 3.The inner ring surface of metal ring 3 is provided with 8 semicircle fixed grooves 9 one to one with cast primitive LED1.8 cast primitive LED1 are arranged in the groove 11 axially arranging along the outer surface of transparent pipe 2.Second half correspondence of 8 cast primitive LED1 snaps in 8 fixed grooves 9 of Al-alloy metal annulus 3 fixing, and the diameter of fixed groove 9 is 3.25mm.
The lower end of 8 cast primitive LED1 is connected with the output of LED driving power with every 2 formation series connection, the connected modes of mode parallel with one another again, is pressed into the inner side of quartzy transparent pipe 2, and then has fixed the lower end of cast primitive LED1 in 4 series connection ends 8 after turning over.
After lighting a lamp, the interior outside of quartz transparent pipe 2 forms the temperature difference, and then cold air enters into lamp socket inner cavity chamber from passage 5', flow in the inner space of quartzy transparent pipe 2 again, enter the outer space of quartzy transparent pipe 2 from the lower end of quartzy transparent pipe 2, the heat that outside cast primitive LED1 is sent takes away from convection holes 10, lamp socket outer chamber, passage 5 and flows out, cold air constantly covers, hot-air continuously outflows, thereby forms thermal-convection loop, thereby enters to reduce the temperature rise of LED light-emitting component.
After tested, the power 5.7W of this filament LED bulb, luminous flux is 667.3 lumens, luminous efficiency 117.07 lumens/watt, correlated colour temperature 2651k, colour rendering index 81.6, the incandescent lamp bulb of alternative 60w.
Embodiment 2: as shown in Figure 6, a kind of filament LED bulb, adopts the LED lamp bar of COB encapsulation as LED light-emitting component, and the external diameter of LED lamp bar is 2.2mm, and long is 45mm.Described bulb comprises lamp holder, lamp holder below is fixed with aluminium alloy lamp socket 12, the lower end of aluminium alloy lamp socket 12 is connected with bulb housing, in bulb housing, be filled with atmospheric neon half, described transparent pipe is located in bulb housing, the inwall of its top and aluminium alloy lamp socket 12 is close to, and edge can connect by gluing.The wall thickness of transparent pipe is 3.5mm, and length is 75mm, and insertion depth is about 25mm, and on the transparent pipe below metal lamp holder, being provided with diameter is 12 semi-circular grooves of 2.25mm.12 LED lamp bars stick in semi-circular groove by transparent silica gel.12 LED lamp bars form the mode of connecting with every 2, and 6 series connection ends 8 are positioned at the upper end of quartzy transparent pipe 2, and the lower end of the LED lamp bar of 6 series connection respectively parallel connection is that power input is electrically connected with driver output end, and driving power is built in lamp holder 6.
The heat of the luminous generation of LED lamp bar passes on transparent pipe, and transparent pipe conducts by heat and thermal-radiating mode is gone out dissipation of heat by aluminium alloy lamp socket 12, thereby gives the cooling of LED lamp bar.
After tested, the power 9.0W of this filament LED lamp, luminous flux is 1011 lumens, luminous efficiency 112.3 lumens/watt, correlated colour temperature 2657k, colour rendering index 81.5, the incandescent lamp bulb of alternative 100w.
Claims (15)
1. a filament LED bulb, is characterized in that: comprise interior heat sink, described interior heat sinkly made by transparent pipe, the outer surface of transparent pipe or inner surface are provided with LED light-emitting component.
2. filament LED bulb according to claim 1, is characterized in that: described LED light-emitting component is cast primitive LED or LED lamp bar.
3. filament LED bulb according to claim 1, it is characterized in that: described LED light-emitting component with every two series connection again mode parallel with one another be connected, the electric wire of every two series connection turns down and is close on the tube wall of transparent pipe to the another side of LED light-emitting component installed surface, with the lower end of fixed L ED light-emitting component.
4. filament LED bulb according to claim 1, is characterized in that: described transparent pipe is glass tube or plastic tube, the aperture of transparent pipe is 2-200mm, and wall thickness is 0.1-10mm, and length is 10-300mm.
5. filament LED bulb according to claim 1, is characterized in that: described transparent pipe is cone-shaped or column, its cross section be shaped as circle, ellipse, triangle or polygon.
6. filament LED bulb according to claim 1, is characterized in that: the surface of described transparent pipe has the groove equating with LED light-emitting component quantity, and LED light-emitting component embeds in groove.
7. filament LED bulb according to claim 6, is characterized in that: described groove is uniformly distributed along the circumferential direction of transparent pipe.
8. filament LED bulb according to claim 6, is characterized in that: described groove be shaped as circular arc, trapezoidal or rectangle, when groove is circular arc, its diameter is 0.3mm～15mm, and is slightly larger than the external diameter of LED light-emitting component.
9. according to claim 1, filament LED bulb described in 3-8 any one, it is characterized in that: described LED light-emitting component is cast primitive LED, described bulb comprises lamp holder, lamp socket and bulb housing, lamp holder is fixed on lamp socket upper end, bulb housing is arranged on lamp socket lower end, lamp socket is provided with some passages, insert in lamp socket the upper end of described transparent pipe, lamp socket inner chamber is divided into inner cavity chamber and outer chamber two parts, aforementioned passage is located at respectively on inner cavity chamber and lamp socket wall corresponding to outer chamber, between described transparent pipe and inboard wall of lamp holder, be provided with the convection holes that is communicated with transparent pipe outer space and lamp socket outer chamber, cast primitive LED is along the outer surface of transparent pipe or being axially arranged on transparent tube wall or groove of inner surface.
10. filament LED bulb according to claim 9, is characterized in that: described lamp holder is connected with external power, and LED driving power is housed in lamp holder, and the output of LED driving power is connected with the total electric wire that stretches into the cast primitive LED in lamp socket.
11. filament LED bulbs according to claim 9, it is characterized in that: insert in lamp socket by metal ring the upper end of described transparent pipe, the outer ring surface of metal ring and lamp socket lower port place inwall closely cooperate, its inner ring surface closely cooperates with the outer wall of transparent pipe, and described convection holes is located on metal ring.
12. filament LED bulbs according to claim 11, is characterized in that: when described cast primitive LED is located on transparent pipe outer surface, the inner ring surface of above-mentioned metal ring is provided with the fixed groove one to one with cast primitive LED.
13. according to the filament LED bulb described in claim 1,3-8 any one, it is characterized in that: described LED light-emitting component is LED lamp bar, described bulb comprises lamp holder, lamp holder below is fixed with metal lamp holder, the lower end of metal lamp holder is connected with bulb housing, filling with inert gas in bulb housing, and described transparent pipe is located in bulb housing, its top is located on the inwall of metal lamp holder, and LED lamp bar is located on the transparent tube wall or groove of metal lamp holder below.
14. filament LED bulbs according to claim 13, is characterized in that: described metal lamp holder is aluminium alloy lamp socket.
15. filament LED bulbs according to claim 13, is characterized in that: described inert gas is half atmospheric neon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343131.5U CN204026210U (en) | 2014-06-25 | 2014-06-25 | Filament LED bulb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343131.5U CN204026210U (en) | 2014-06-25 | 2014-06-25 | Filament LED bulb |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204026210U true CN204026210U (en) | 2014-12-17 |
Family
ID=52066069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420343131.5U Expired - Fee Related CN204026210U (en) | 2014-06-25 | 2014-06-25 | Filament LED bulb |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204026210U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033774A (en) * | 2014-06-25 | 2014-09-10 | 连云港晶德照明电器有限公司 | LED filament bulb |
| TWI638116B (en) * | 2017-09-01 | 2018-10-11 | 液光固態照明股份有限公司 | Led light bulb and manufacturing method thereof |
| CN109952470A (en) * | 2016-11-18 | 2019-06-28 | 朗德万斯公司 | Lighting device and LED light for LED light |
-
2014
- 2014-06-25 CN CN201420343131.5U patent/CN204026210U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104033774A (en) * | 2014-06-25 | 2014-09-10 | 连云港晶德照明电器有限公司 | LED filament bulb |
| CN109952470A (en) * | 2016-11-18 | 2019-06-28 | 朗德万斯公司 | Lighting device and LED light for LED light |
| CN115930125A (en) * | 2016-11-18 | 2023-04-07 | 朗德万斯公司 | Lighting device for LED lamp and LED lamp |
| TWI638116B (en) * | 2017-09-01 | 2018-10-11 | 液光固態照明股份有限公司 | Led light bulb and manufacturing method thereof |
| US11221108B2 (en) | 2017-09-01 | 2022-01-11 | Liquidleds Lighting Corporation | LED light bulb and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 |