EP3861251A1 - Linear led light source - Google Patents
Linear led light sourceInfo
- Publication number
- EP3861251A1 EP3861251A1 EP18783408.0A EP18783408A EP3861251A1 EP 3861251 A1 EP3861251 A1 EP 3861251A1 EP 18783408 A EP18783408 A EP 18783408A EP 3861251 A1 EP3861251 A1 EP 3861251A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support frames
- led
- light source
- linear led
- linear
- 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
Classifications
-
- 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
- F21K9/27—Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
-
- 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
-
- 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
- F21V23/06—Arrangement of electric circuit elements in or on lighting devices the elements being coupling devices, e.g. connectors
-
- 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
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
- F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to a linear LED light source according to the subject-matter of claim 1.
- the present invention specifically relates to a linear LED light source in which LED units are linearly arranged in an elongated, substantially cylindrical translucent lamp envelope, such as a glass tube.
- the present invention is applicable to conventional linear LED light sources in which multiple LEDs are used in the LED units, as well as to linear LED filament light sources.
- LED filament light sources such as LED filament lamps or LED filament light bulbs produce light by LED filaments - multi-diode structures that resemble the filament of an incandescent light bulb.
- the LED filaments consist of multiple LEDs connected in series on a transparent substrate, allowing the light emitted by the LEDs to disperse evenly and uniformly.
- a coating of yellow phosphor in a resin binder material converts the blue light generated by the LEDs into white light.
- An example for a LED filament light source is disclosed in US 8,400,051 B2.
- LED filaments are also used in linear LED light sources that have a translucent lamp envelope of essentially cylindrical tube shape and a plurality of LED filaments arranged along the longitudinal axis of the lamp envelope.
- the length of such linear LED filament arrangements is limited owing to problems of current imbalance and a consequent reduction in lamp performance and lifetime that occur when prior art techniques for powering the LED filaments are applied to longer lamps. Consequently it has not yet been possible to capitalise on the very high efficacy and full 360 degree light emission of LED filaments in linear light sources having lengths greater than approximately 500 mm.
- tubular LED filament lamps should be produced in dimensions substantially the same as traditional linear light sources such as fluorescent discharge tubes and LED replacements for the same, i.e. having lengths between approximately 450 mm and 2400 mm. This calls for the use of between about 10 and 80 LED filaments per lamp, and if connected in series would result in lamp voltages of around 500-8000 Volts (V).
- the voltage of such lamps should not exceed about 100 V, for reasons of electrical safety, compatibility with the creepage and clearance distances of standardised lamp caps and holders established for use with linear light sources, and compatibility with the output voltage ratings of typical LED drivers and power suppliers.
- This current imbalance limits the total power at which such a lamp can be operated.
- the current must be set sufficiently low to avoid over-running the LED filaments closest to the power supply end, and shortening their life.
- the LEDs at the other end of the tube are then under-run which limits light output of the lamp, and leads to the undesirable characteristics of not only a gradually decreasing luminous flux along the length of the lamp, but more importantly, a temperature gradient along the length of the lamp.
- the present invention provides a linear LED light source comprising : a plurality of LED units conductively connected to metallic support frames, wherein the metallic support frames are configured to serve as supply conductors through which electric power for driving the LED units is feedable to the LED units, wherein the metallic support frames are manufactured from an alloy and with a diameter such that they have an electrical resistance R/l between
- steel wires are used for the support frames of LED light sources.
- steel wires are characterised by a high electrical resistance, which causes an unfavorable voltage drop, leading to current imbalances between the different LED units.
- the steel wires have therefore been replaced by an alloy having greatly reduced electrical resistance, which allows the diameter of the wires to be minimised and the luminous flux and efficacy of the linear light source to be maximised.
- the electrical resistance R/l as defined in the claims denotes electrical resistance per length unit with the unit itiW/m (milliohms per metre). It is calculated from the specific electrical resistance or electrical resistivity of the used alloy, p, which is a material specific constant and usually given in units of W-m (ohm-metres) at a temperature of the alloy of 20°C, and the cross-sectional area A of the metallic support frame, which is usually expressed in mm 2 , according to the formula
- the voltage drop in the LED units can be dropped to acceptable levels of less than approximately 100 millivolts per metre.
- a linear LED light source with considerably greater length than in the prior art can be
- the metallic support frames are manufactured from an alloy and with a diameter such that they have an electrical resistance between 50 itiW/m and 150 itiW/m, more preferably 90 itiW/m to 120 itiW/m.
- the metallic support frames are manufactured from nickel or a nickel alloy, preferably a nickel-manganese alloy. These alloys have a very low specific electrical resistance and favorable mechanical properties. Materials such as copper and its alloys are known to be used as materials for the wiring in electric lamps, and specifically for the tracks of printed circuit boards to which traditional LEDs are normally attached. However, copper is a very soft metal which is not mechanically robust, and which is also very difficult to attach to the LED filaments by conventional techniques such as resistance welding. Nickel and its alloys overcome these problems, providing a metal alloy with low specific electrical resistance, high mechanical stability and good weldability. The high mechanical stability further enhances the reliability of the linear LED light source, since the support frame is less prone to breaking.
- the metallic support frames are manufactured from a metal alloy that consists of 1 to 3 wt% manganese (Mn), preferably 2 wt% manganese (Mn), the remainder being nickel (Ni) and inevitable impurities.
- Mn manganese
- Ni nickel
- This alloy has been found to be specifically suitable for attaining the object of the present invention due to its good mechanical and welding properties.
- the specific electrical resistance p of the metallic material is in a range between 5 mWoiti and 20 mWoiti, further preferably between 10 mWoiti and 15 mWati, further preferably between 11 mWoiti and 12 mWati.
- the specific electrical resistance or electrical resistivity p is a material property hat quantifies how strongly that material opposes the flow of electric current. It is defined as the resistance of a centimeter cube of a material to the passage of an electric current perpendicular to the two faces.
- the support frames are manufactured as wires with a diameter of 2 mm or less, preferably 1.5 mm or less, more preferably between 1 mm and 1.5 mm, more preferably between 1.1 mm and 1.3 mm.
- the value of 2 mm is an upper limit for the diameter of the support frames that is typically less than the diameter of the LED filaments.
- the cross-sectional shape of the support frames is not particularly limited and may be circular if the support frames are to be manufactured from wires.
- the support frames may be manufactured from metal strips or sheets having a non-circular cross section to further limit optical shadowing and increase mechanical strength.
- two support frames are provided, each being conductively connected to an electrical contact of the linear LED light source.
- the LED units are connected between the support frames in parallel. This allows operating all LED units in parallel. With this, the voltage for operating the linear LED light source can be greatly reduced.
- the linear LED light source comprises a sealed lamp envelope of essentially cylindrical shape, wherein the LED units are sequentially arranged along the longitudinal axis of the sealed lamp envelope.
- the LED units are arranged substantially along the entire length of the longitudinal axis.
- the distance between the ends of the sealed lamp envelope and the respective LED unit nearest to said end of the sealed lamp envelope is smaller than four times, preferably three times, more preferably twice the diameter of the sealed lamp envelope.
- the length of the linear LED light source is 500 mm or more.
- the fabrication of linear LED light sources of these lengths is made possible by use of the inventive support frames.
- the LED units are connected to the metallic support frames by metallic spacer components.
- the metallic spacer components are preferably manufactured from the same material as the metallic support frames. With this construction, a high mechanical reliability as well as a further improvement of the lifetime of the linear LED light source can be attained.
- the linear LED light source comprises buffer springs that are configured to support the support frames against the inner wall of the sealed lamp envelope. This increases the mechanical stability of the electrical components of the light source, thus improving the robustness and contributing to a prolongation of its lifetime.
- the linear LED light source further comprises isolating bridges that are provided between the support frames and are configured to maintain a fixed relative position between the metallic support frames. This serves to further improve the mechanical stability of the linear LED light source.
- the isolating bridges are arranged adjacent to the longitudinal ends of the sealed lamp envelope, respectively.
- the isolating bridges can support the mechanical stability of the LED units whilst minimising the blockage of emitted light.
- the linear LED units are constituted by LED filaments.
- LED filaments have an essentially omnidirectional light emission pattern and are thus beneficial for obtaining good light emission characteristics in the linear LED light source. It should be emphasised, however, that the present invention is also applicable to conventional linear LED light sources in which the LED units are constituted by LEDs of all types of packages mounted on a printed circuit board or an equivalent carrier and arranged inside the sealed lamp envelope.
- Fig. 1 shows a schematic view of a linear LED filament light source according to an embodiment of the present invention
- Fig. 2 is a schematic view of the linear LED filament light source of Fig. 1 in which relevant dimensional parameters are specified.
- Fig. 1 is a schematic view of a linear LED light source according to an
- the linear LED light source comprises a sealed lamp envelope 11 of essentially cylindrical shape that is translucent and made of glass.
- a light source mount assembly is arranged inside the sealed lamp envelope 11.
- the light source assembly comprises multiple LED units 12 mounted to metallic support frames 13a, 13b optionally via metallic spacer components 14, isolating bridges 15 and buffer springs 16.
- the LED units 12 of the present embodiment are constituted by LED filaments.
- the LED units 12 are sequentially aligned along the longitudinal axis of the sealed lamp envelope 11 and disposed essentially along the entire length of the sealed lamp envelope 11.
- the light source assembly 10 is connected to an electrical feedthrough
- the metallic support frames 13a, 13b are conductively connected, e.g. welded or soldered to the electrical feedthrough component 17.
- the metallic support frames 13a, 13b which carry the LED units 12 are supported against the inner wall of the sealed lamp envelope 11 by buffer springs 16 which serve to maintain the LED units 12 and the support structure of the support frames 13a, 13b and the optional metallic spacer components 14 along the axis of the sealed lamp envelope 11. They also serve to prevent physical damage by absorbing mechanical shocks that may be experienced during handling and transportation of the linear LED light source.
- the optional metallic spacer components 14 may serve to orientate the LED units 12 in a particular mechanical configuration - in the present embodiment, in a linear configuration extending over the most part of the length of the sealed glass envelope 11.
- metallic spacer components 14 may be provided in order to further stabilise the assembly of the LED units 12 and metallic spacer components 14 in order to further stabilise the assembly of the LED units 12 and metallic spacer components 14 in order to further stabilise the assembly of the LED units 12 and metallic spacer components 14 two electrically isolating bridges 15 are provided near the respective ends of the sealed lamp envelope 11 to maintain a fixed relative position between the metallic support frames 13a, 13b, and may also optionally be provided at intermediate locations.
- the isolating bridges 15 may be formed, for instance, from a dielectric material such as glass or ceramic bearing electrically isolated metallic wires for convenient welding to the support frames 13a 13b.
- the buffer springs 16 may be combined into the same physical assembly as the isolating bridges 15, as can be seen at the right end of the sealed lamp envelope 11.
- the sealed lamp envelope 11 is filled with a gas filling 18 that is preferably a gas of low atomic weight like hydrogen, helium or a mixture thereof.
- the gas filling 18 consists of a thermally conductive gas of low atomic mass containing fewer than 50,000 ppm (parts per million) of impurities, preferably fewer than 10,000 ppm, more preferably fewer than 1,000 ppm, further more preferably fewer than 100 ppm.
- the gas filling 18 preferably consists of hydrogen or helium with the specified high chemical purity.
- the sum of the contents of oxygen, nitrogen, argon and hydrocarbon vapours in the gas filling 18 is 50,000 ppm or lower, preferably 10,000 ppm or lower, more preferably 1,000 ppm or lower, further more preferably 100 ppm or lower.
- the sealed lamp envelope 11 may optionally be capped by bases 19 at one or both ends.
- the left base 19 is equipped with electrical contacts 17a that are connected to the electrical feedthrough components 17.
- the bases 19 are attached to the sealed lamp envelope 11 by an adhesive 19a.
- Fig. 1 depicts a linear LED light source with a pair of electrical contacts 17a at the same end of the linear LED light source, it should be noted that the electrical contacts 17a may also be arranged with one electrical contact 17a at each end of lamp, or with a plurality of electrical contacts 17a at both ends of the lamp.
- the electrical feedthrough components 17 electrically connect the light source mount assembly 10 to the exterior of the sealed lamp envelope 11.
- the electrical feedthrough components 17 are hermetically sealed into the sealed lamp envelope 11 in a gas-tight fashion of sufficient quality to avoid leakage of the gas filling 18.
- the metallic spacer components 14 are connected to the metallic support frames 13a, 13b and provide a conductive connection between the metallic support frames 13a, 13b and the LED units 12.
- the LED units 12 may be connected directly to the metallic support frames 13a, 13b without the use of intermediate metallic spacer components 14.
- the metallic spacer components 14 and LED units 12 are arranged such that the LED units 12 are connected in parallel between the metallic support frames 13a, 13b.
- the metallic support frames 13a, 13b and the metallic spacer components 14 not only serve not only serve as mechanical support frame for the LED units 12, but also as supply conductors via which electrical power supplied from the electrical contacts 17a is fed to the LED units 12.
- the metallic components of the light source mount assembly 10 and the electrical feedthrough component 17 can be connected in any suitable manner that ensures a conductive connection between them, e.g. by welding.
- the metallic support frames 13a, 13b are manufactured from an alloy having an electrical resistance R/l in the region of 50 to 200 milliohms per metre (itiW/m).
- the metallic support frames 13a, 13b are manufactured from nickel or a nickel alloy, more specifically a nickel- manganese alloy, still more specifically nickel having 2% manganese content by weight, in order to attain satisfactory mechanical and welding properties.
- the metallic support frames 13a, 13b may be made from ordinary wires with an essentially circular cross-section and a diameter that does not exceed 1.5mm, in order to limit light absorption and shadowing effects.
- the metallic support frames 13a, 13b may also be manufactured from strips or sheet metal having a non- circular cross section to further limit optical shadowing and increase mechanical strength, and may be so formed as to integrate the function of the metallic spacers 14 and the buffer springs 15 into a single component.
- the cross-sectional shape of the metallic support frames 13a, 13b is not particularly limited, as long as the metallic alloy for the metallic support frames 13a, 13b and the cross-sectional area of the metallic support frames 13a, 13b are chosen such that the electrical resistance R/l, which may be calculated by dividing the specific electrical resistance p of the used alloy by the cross-sectional area A of the metallic support frames 13a, 13b, lies within the specified range of 50 W/m to 200 itiW/m.
- Fig. 2 serves to illustrate relevant dimensional parameters of the linear LED light source of Fig. 1.
- the outer diameter of the sealed glass envelope 11 and, thus, of the linear LED light source, is denoted by d.
- the inner diameter of the sealed glass envelope is denoted by d,.
- L designates the length of the linear LED light source, excluding the protruding electrical contact pins as is standard practice.
- the light-emitting source constituted by the sequentially arranged LED units 12 extends substantially over the entire length L of the linear LED light source. More precisely, the distance between the inner ends of the sealed glass envelope 11 and the nearest LED unit 12 is smaller than twice the outer diameter of the sealed lamp envelope 11. Thus, the length of the non- radiating zones at each end of the linear LED light source does not exceed two times the outer diameter d of the linear LED source.
- linear LED light sources with a length of 500 mm or more.
- the linear LED light source according to the present embodiment can be driven at a power density greater than 6 Watts or 1000 lumens per linear foot of tube length without suffering problems of thermal runaway of the LED units 12 and the associated premature failures.
- the present invention allows the length of linear LED light sources, particularly that of LED filament light sources, to be considerably increased as compared to conventional linear LED light sources.
- the present invention allows the efficacy and performance of LED linear light sources to be improved, and allows the uniformity of luminous flux and temperature along the length of the linear LED light sources to be improved such that higher- performance products can be realised.
- the present invention has been motivated in the context of LED filament light sources. It is, however, emphasized that the present invention is also applicable to conventional linear LED light sources in which the LED units 12 are constituted by LEDs mounted on a printed circuit board or an equivalent carrier and arranged inside the sealed lamp envelope 11.
- the LED units 12 may also be constituted by LED packages as defined in the International
- a LED package is an electric component comprising at least one LED die, and can include optical elements, light converters such as phosphors, thermal, mechanical and electric interfaces, as well as components to address ESD concerns.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2018/076687 WO2020069723A1 (en) | 2018-10-01 | 2018-10-01 | Linear led light source |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3861251A1 true EP3861251A1 (en) | 2021-08-11 |
Family
ID=63798971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18783408.0A Pending EP3861251A1 (en) | 2018-10-01 | 2018-10-01 | Linear led light source |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3861251A1 (en) |
WO (1) | WO2020069723A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2024501705A (en) | 2021-01-06 | 2024-01-15 | シグニファイ ホールディング ビー ヴィ | Filament-based solid-state lighting devices |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5463447B2 (en) | 2008-01-18 | 2014-04-09 | 三洋電機株式会社 | Light emitting device and lamp provided with the same |
TWM376709U (en) * | 2009-09-02 | 2010-03-21 | Liquidleds Lighting Corp | Curved tubular LED lamp |
CN203656626U (en) * | 2013-11-28 | 2014-06-18 | 浙江锐迪生光电有限公司 | High-power LED lamp without metal radiator |
RU2658345C1 (en) * | 2014-10-09 | 2018-06-20 | Филипс Лайтинг Холдинг Б.В. | Method of manufacture of the lighting device |
CN104930384A (en) * | 2015-07-01 | 2015-09-23 | 上海顿格电子贸易有限公司 | LED lamp |
CN205244861U (en) * | 2015-11-15 | 2016-05-18 | 河北蓝瑞照明科技有限公司 | LED bulb capable of emitting light at full angles |
JP6271059B1 (en) * | 2017-04-12 | 2018-01-31 | 森山産業株式会社 | LED glass tube lamp |
-
2018
- 2018-10-01 WO PCT/EP2018/076687 patent/WO2020069723A1/en unknown
- 2018-10-01 EP EP18783408.0A patent/EP3861251A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020069723A1 (en) | 2020-04-09 |
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