GB2527041A - Retrofit LED light bulb - Google Patents

Retrofit LED light bulb Download PDF

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Publication number
GB2527041A
GB2527041A GB1410170.3A GB201410170A GB2527041A GB 2527041 A GB2527041 A GB 2527041A GB 201410170 A GB201410170 A GB 201410170A GB 2527041 A GB2527041 A GB 2527041A
Authority
GB
United Kingdom
Prior art keywords
led
retrofit
light bulb
circuit board
printed circuit
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.)
Granted
Application number
GB1410170.3A
Other versions
GB201410170D0 (en
GB2527041B (en
Inventor
Wen Tao Kuang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kosnic Lighting Ltd
Original Assignee
Kosnic Lighting Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kosnic Lighting Ltd filed Critical Kosnic Lighting Ltd
Priority to GB1410170.3A priority Critical patent/GB2527041B/en
Publication of GB201410170D0 publication Critical patent/GB201410170D0/en
Publication of GB2527041A publication Critical patent/GB2527041A/en
Application granted granted Critical
Publication of GB2527041B publication Critical patent/GB2527041B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • 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
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/238—Arrangement or mounting of circuit elements integrated in the light source
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
    • 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
    • F21W2121/00—Use or application of lighting devices or systems for decorative purposes, 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
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

An LED module 102 for a retrofit LED light bulb 101 comprises a printed circuit board 105 and first and second non-directional double-ended linear LED elements 106, 107 connected to the printed circuit board 105. A gap G is provided between each linear LED element 106, 107 and the printed circuit board 105 along the length of the light emitting region L of the linear LED elements. The gap G minimizes the obstruction of light emitted by the linear LED elements by the printed circuit board 105. A retrofit LED light bulb 101 comprises a lamp base 103, a lamp envelope 104 and the LED module 102.

Description

REThOFIT LED LIGHT BULB
Field of the Invenfion
The present invention relates to a retrofit LED light bulb, in particular to an LED module for a retrofit LED light bulb and a retrofit LED light bulb comprising the LED module.
ccttbJnv.,?nt1Q Light emitting diode (LED) lamps are often favoured for exhibiting improved operational efficiency and lifetime when compared to incandescent or fluorescent lamps. Retrofit LED light bulbs are known that are usable with an existing light fixture, as a replacement for an incandescent light bulb. Retrofit LED light bulbs are available in different shapes, such as arbitrary (A-series), g]ohe or circular ((3-series), ellipsoidal (E-series), tubular (T-series) and candle or conical (C-series) styles, and with different conventional bases, such as threaded and bayonet types, for fitting different light fixtures and achieving different aesthetic results. In addition, retrofit LED light u]bs are also available in different colours and finishes.
A known type of retrofit candle LED light bulb is shown in FigL e A. This prior art retrofit LED light bulb Al comprises an LED module A2 comprising a plurality of LEDs A3. an electronic LED driver for supplying power to the LED module, a mount casing A4. a translucent or opaque lamp envelope AS. and a lamp base A6 for making mechanical and electrical contac.t with a light fixture. The naunt
I
casing A4 is disposed between the LED module A2 and the lamp base A6, and between the lamp envelope AS and the lamp base A6. The mount casing A4 is formed from a heat conductive plastics materiai and is in contact with an aluminium element A7. to enhance the dissipation of heat produced during operation of the LED light bulb.
A problem with such types of prior art retrofit LED light bulbs Al is that the LEDs A3 are orient-ed to face upwards (with the reverse side facing the base A6) such that the majoritu of the LED light is projected forwards, with the level of light to in the lower and side areas of the LED light bulb Al being much lower. Another potential disadvantage is that the mount casing A4 is visible, such that the general appearance of the LED light bulb Al deviates from that of a traditional incandescent or fluorescent light bulb, which can be detrimental to the overall visual effect of the LED light bulb A further issue is that the many components used in the prior art retrofit LED light bulb Al means relatively complex manufacturing and assembly processes, arid relatively high material and production costs.
Summary of the Invention
According to a first aspect there is provided an LED module for a retrofit LED light bulb, said LED module comprising: a printed circLlit hoard, and at least first arid second nondirectional double-ended linear LED elements, each in electrical connection with said printed circuit board; and a gap being provided between each said linear LED element and said printed circuit hoard along the length of the light emitting region of the linear LED element, whereby said gap rninimises the obstruction of light ernit'ted by the linear LED elemerr by the printed circuit board.
In an embodiment. the gap is provided by a slot formed in an edge of the printed circuit board.
Preferably, the linear LED elements are connected to copper [races *that are to maximised in area, whereby the copper traces provide both circuit wiring and heat sink functionality.
In an embodiment, the printed circuit board supports electronic components of an LED driver.
In an embodiment, the LED module further' comprises third and fourth linear' LED elements.
In an embodiment, the printed circuit board is double-sided.
In an application, the LED module is provided for use in a retrofit candle LED light bulb.
According to a second aspect, there is prodded a retrofit LED light bulb comprising a lamp envelope, a lamp base for use with a light fixture and an LED module according to the firsi aspect.
In al-i embodiment, the retrofit LED light bulb is a retrofit candle LED light bulb.
Preferably, the printed circuit board is located directly within the lamp base.
The lamp base may comprise a screw threaded fitting arrangement or a bayonet fitting arrangement.
Preferably, the envelope is secured directly to the base.
The lamp envelope may be translucent or opaque.
Different aspects and embodiments of the invention may be used separately or together -Purther particular and preferred aspects of the present invention are set out in the accompanying independent and dependent claims. Features of the dependent claims may be combined with the featLires of the independent claims as appropriate, and in combination other than those explicitly set out in the claims. a
The present invention will now be more particularly described, with reference to the accompanying drawing. in which: Figure A shows a prior art retrofit candle LED light bulb; Figures 1. & 2 show assembled and exploded views respectively of a retrofit LED light bulb comprising an LED module according to the present invention on Example embodiments are described below in sufficient detail to enable those of ordinary skill in the art to embody and implement the systems and processes herein described. It is important to rnderstand that embodiments can be provided in many alternate forms and should not be construed as limited to the examples set forth herein.
A retrofit LED light bulb 101 is shown in Figures 1 & 2. An assembled view of the retrofit LED light bulb 101 is shown in Figure 1, and an exploded view of the retrofit LED light bulb 101 is shown in Figure 2.
The retrofit LED light bulb 1.01 comprises an LED module 102, a lamp base 103 for use with a light fixture, and a lamp envelop 104. lri this embodiment, the retrofit LED ligirE bulb 101 is a retrofit candle LED light bulb.
The LED module 102 comprises a printed circuit board 105. and at least first arid second non--directional double--ended linear LED elements 106, 107, each in electrical connection with the printed circuit board 105. in this embodiment, the LED module 102 comprises the first and second linear LED elements 106, 107 only. in an alternative embodiment, the LED module further comprises third and fourth Iineai-LED elements. In this illustrated embodiment, the printed circuit board 105 is double-sided.
Each of the linear LED elements 106, 107 is provided with a pair of connection pins at each end thereof, and each of the linear LED elements 106, 107 extends between a pair of connection points on the printed circuit board 105. As shown, linear LED element 106 is provided with connection pins, 108, 109 at each end thereof, and extends between a pair of connection points 1110, 11 1 on the printed circuit board 105. in this embodiment, each of the linear LED elements 106, 107 has a beam angle that is greater than 180°. A gap G is provided between each of the linear LED elements 1 u6, 10/ and the printed circuit board along the length L of the light emitting region of the linear LED element 106, 107. The provision of the gap G between each of the linear LED elements 106, 107 and the printed circuit board 105 advantageously minimises the obstruction of light emitted by the linear LED element by the printed circuit board 105.
According to the illustrated embodiment, each of the gaps (3 is provided oy a slot formed in an edge of the printed circuit board 105 in the illustrated view of the arrangement of retrofit LED light bulb 101, the prinled circuit board presents an 1' shape.
The linear LED elements 106, 1.07 are connected to copper traces, such as copper trace 112. of the printed circuit board 105 that are maximised in area.
The cop-per traces with maximised area of the printed circuit board 105 of the LED module 102 beneficially provide both circuit wiring and heat sink to functionalily. The copper traces of the printed circuit board 105 of the LED module 102 serve to aid the dissipation of heat produced by the linear LED elements 106.107.
In this illustrated embodiment, the printed circuit board 105 supports electronic components 113 of an LED driver. As shown, the printed circuit board 105 has an upper end 114 and a lower end 115., and the electronic components 113 of the on-board LED driver are positioned towards the lower end 115 of the printed circuit board 105.
Beneficially, the lower end 1.15 of the printed circuit board 105 is inserted directly into the lamp base 103. The arrangement of the LED module 102 advantageously simplifies the manufacturing and assembly processes, and reduces material and production costs.
As iliustraled. in the assembled retrofit LED light bulb 101, the lower end 1 14 of the printed circuit board 105 is within the lamp base 1.03, the linear LED elements 106, 107 extend substantially perpendicularly to the lamp base 103, and the upper end 115 of the printed circuit board 105 is presented as a free end inside the lamp envelope 104, The linear LED elements 106, 1.07 thus extend substantially in the longitudinal direction of the assembled retrofit LED light bulb 1 01 (from the bottom of the lamp base 103 to the tip of the lamp envelope 104).
The arrangement of the LED module 102 avoids the requirement for an interconnecting mounting component between the LED module and the lamp base and provides a visual appearance that is closer to that of a traditional incandescent bu]b that the retrofit LED light bulb 101 may replace.
The lamp base 103 of the retrofit LED ligfrL bulb 101 may have any suitable dimensions, shape, colour, finish and fitting an'angement. In the illustrated embodiment, the lamp base 103 comprises a screw threaded fitting arrangement.
In an alternative embodiment, the lamp base 103 comprises a bayonet fitting arrangement.
According to the illustrated embodiment, the lamp envelope 104 of the retrofit LED light bulb 101 is advantageously secured directly to the lamp base 103. This is enabled by the arrangement of the LED module 102, which overcomes the
S
requirement for an Interconnecting insert component between the LED rnodue and the lamp base. The direct location of the LED module 102 in the lamp base 103, and the direct securement of the amp envelope 104 to the lamp base 103, provides an improved, simplified construction of retrofit LED light bulb 101.
The lamp envelope 104 of the retrofit LED light bulb 101 may have any suitable dimensions, shape. transparency, colour and finish. In the shown embodiment, the lamp envelope 104 is a standard candle lamp envelope. The cand]e lamp envelope 104 may alternatively be a twisted candle, chandelier, tubular or bent tip to type bulb. It is to be appreciated however that the lamp envelope of the retrofit LED light bulb may be an.y suitabIe type. The lamp envelope may be symmetrical or asymmetrical in the radial direction and in the axial direction.
In an embodiment, the lamp envelope 104 Is translucent.. in an alternative embodiment, the lamp envelope 104 is opaque. In an example, the lamp envelope 104 has an opal finish.
It is to be appreciated that the present invention provides an LED module for a retrofit LED light bulb, and a retrofit LED light bulb comprising the LED module.
The filament type linear LED elements of the I..ED module are particularly suitable for use in a retrofit candle LED light bulb. However, it is to be appreciated that the present invention is nd limited to a retrofit candle LED light bulb.
The LED module provides for improved light distribution from, arid production of, a retrofit LED light bulb.
Although illustrative embodiments of the invention have been disclosed in detail S herein, with reference to the accompanying drawings, it is understood that the invention is not]imited to the precise embodiments shown and that various changes and modifications can he effected therein by one skilled in the art without departing from the scope of the invention as defined by the appended c]aims and their equivalents.

Claims (15)

1. An LED module for a retrofit LED light bulb, said LED module comprising: a printed circuit board, and at least first and second non-directional double-ended linear LED elements, each In electrical connection with said printed circuit board; and a gap being provided between each said linear LED element and said printed circuit board along the length of the light emithng region of the linear 1 -PD element, whereby said gap minimises the obstruction of light emitted by the linear I Pr) element by the printed circuit board.
2. An LED module as claimed in claim 1, wherein said gap is provided by a slot formed In an edge of the printed circuit board.
3. An LED module as claimed in claim 1 or claim 2, wherein said linear LED elements are connected to copper traces that are maximised In area, whereby said copper traces provide both circuit wiring and heat sink functionality.
4. An LED module as clalmedin any of claims ito 3, whereIn said printed circuit board supports electronic components of an LED driver.
5. An LED module as claimed in any of claims 1 to 4, further comprising third and fourth linear LED elements.
6. An LED module as claimed in any of claims 1 to 5, wherein said printed circuit board is double-sided.
7. An LED module as claimed in any of claims I to 6. for use in a retrofit candle LED light bLilh.
8. A retrofit LED light bulb comprising a lamp envelope, a lamp base for use with a light fixture and an LED module as claimed in any of claims Ito 6.
9, A retrofit LED light bulb comprising an LED module as claimed in claim 8, wherein said retrofit LED light bulb is a retrofit candle LED light bulb.
10. A retrofit LED light bulb as claimed in claim 8 or claim 9, wherein said printed circuit board is located directly within the lamp base.
111. A retrofit candle LED light bulb as claimed in in any of claims 8 to 10, wherein said lamp base comprises one of: a screw threaded filling arrangement, a bayonet fitting arrangei..ent.
12. A retrofit LED light bulb as clnirned in any of claims 8 to 11, wherein said lamp enveiope is secured directly to said lamp base.
13. A retrofit LED light bulb as claimed in any of claims 8 to 12, S wherein said lamp envelope is one of translucent, opaque.
14. An LED module for a retrofit LED light bulb, substantially as descrihec] herein with reference to the accompanying drawings.to
15. A retrofit LED light bulb substantially as describec:l herein with reference to the accompanying drawings.
GB1410170.3A 2014-06-09 2014-06-09 Retrofit LED light bulb Active GB2527041B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1410170.3A GB2527041B (en) 2014-06-09 2014-06-09 Retrofit LED light bulb

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1410170.3A GB2527041B (en) 2014-06-09 2014-06-09 Retrofit LED light bulb

Publications (3)

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GB201410170D0 GB201410170D0 (en) 2014-07-23
GB2527041A true GB2527041A (en) 2015-12-16
GB2527041B GB2527041B (en) 2020-06-17

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Family Applications (1)

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Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2561145A (en) * 2017-02-06 2018-10-10 Kosnic Lighting Ltd LED light bulb

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010008063U1 (en) * 2010-07-13 2010-09-09 Dapo Leuchten Vertriebs-Gmbh The LED bulb

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010008063U1 (en) * 2010-07-13 2010-09-09 Dapo Leuchten Vertriebs-Gmbh The LED bulb

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2561145A (en) * 2017-02-06 2018-10-10 Kosnic Lighting Ltd LED light bulb
GB2561145B (en) * 2017-02-06 2019-05-15 Kosnic Lighting Ltd LED light bulb

Also Published As

Publication number Publication date
GB201410170D0 (en) 2014-07-23
GB2527041B (en) 2020-06-17

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