GB2463057A - Light emitting diode lighting housing comprising a reflector and heat sink - Google Patents

Light emitting diode lighting housing comprising a reflector and heat sink Download PDF

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Publication number
GB2463057A
GB2463057A GB0815835A GB0815835A GB2463057A GB 2463057 A GB2463057 A GB 2463057A GB 0815835 A GB0815835 A GB 0815835A GB 0815835 A GB0815835 A GB 0815835A GB 2463057 A GB2463057 A GB 2463057A
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GB
United Kingdom
Prior art keywords
reflector
apparatus according
heat sink
light source
preceding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0815835A
Other versions
GB0815835D0 (en
Inventor
Jonathan Mark Baker
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.)
DESIGN 360 Ltd
Original Assignee
Design 360 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 Design 360 Ltd filed Critical Design 360 Ltd
Priority to GB0815835A priority Critical patent/GB2463057A/en
Publication of GB0815835D0 publication Critical patent/GB0815835D0/en
Publication of GB2463057A publication Critical patent/GB2463057A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50Cooling arrangements
    • F21V29/70Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/75Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50Cooling arrangements
    • F21V29/502Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/505Cooling arrangements characterised by the adaptation for cooling of specific components of reflectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50Cooling arrangements
    • F21V29/70Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-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
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-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
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68Details of reflectors forming part of the light source
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/06Optical design with parabolic curvature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/08Optical design with elliptical curvature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2101/00Point-like light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

Lighting apparatus 100 including a light source 102 mounted in or on a housing 106, 112, the housing including a reflector 112, 114 for projecting light emitted by the light source and a fitting component 106. The apparatus further includes heat sink arrangements 109, 116 comprising cooling fins defining grooves that run at least partially along a height/length of the reflector and/or fitting component. The heat sink arrangement is located in front of and behind the light source within the housing for dissipating heat generated by said light source (which may be a Light Emitting Diode, LED).

Description

Lighting Apparatus and Reflector The present invention relates to lighting apparatus and a reflector for lighting apparatus.

Lighting devices inherently produce heat and there can be a risk of fire damage if the heat is not sufficiently dissipated. Further, in LED lights the intensity of the light output can be proportional to the temperature of the LED and so cooling the LED can improve light output. It is known to include heat sinks in lighting devices; however, in known devices the heat sinks are located only to the rear of the light source on the body of the device, which means that rear portions of the devices tend to be bulky.

Embodiments of the present invention are intended to address at least some of the problems outlined above.

According to a first aspect of the present invention there is provided lighting apparatus including a light source mounted in or on a housing, the housing including a reflector for projecting light emitted by the light source and a fitting component, the apparatus including heat sink arrangements located in front of and behind the light source within the housing.

The heat sink arrangement may be at least partially integrated into the reflector. The reflector may include an inner surface arranged to reflect light from the light source and an outer wall on which a said heat sink arrangement is located or formed. The reflector may be an elliptical or parabolic reflector for forward projection of light from the light source. The inner surface of the reflector may define an open space, such that in use, convection currents resulting from temperature differences between ambient air and heat produced by the light source assist with conducting heat to the heat sink arrangement.

The housing may include a fitting component configured to fit the apparatus to another body in use. The fitting component may have at least one outer wall that includes at least part of the heat sink arrangement. The heat sink arrangement may include a plurality of open channels that extend continuously along an outer surface of the reflector and an outer surface of the fitting component.

The light source may be mounted on a member fitted within the housing.

The member may comprise a circuit board. The member may be sandwiched between a surface, typically a planar surface, of the reflector and a surface, typically a planar surface, of the fitting component. Thus, the member/light source can be indirectly in contact with the heat sink arrangements on the reflector and the fitting. Both sides of the member/light source can be directly in contact with planar surfaces of components that include heat-sink arrangements, i.e. the reflector and the fitting component.

The reflector may be at least partially formed of metal or a metallised material.

The heat sink arrangement may include a plurality of fins defining grooves that run at least partially along a height/length of the reflector and/or fitting component. The heat sink arrangement may include a set of spaced apart members that define circumferential grooves, which may be axially aligned with a main axis of the apparatus.

The housing may be fitted together by means of screws or a threaded arrangement.

The light source may comprise at least one LED. The lighting apparatus may comprise a replaceable module or luminaire.

According to another aspect of the present invention there is provided a lighting apparatus reflector including an integrated heat sink arrangement.

Whilst the invention has been described above, it extends to any inventive combination of features set out above or in the following description.

Although illustrative embodiments of the invention are described in detail herein with reference to the accompanying drawings, it is to be understood that the invention is not limited to these precise embodiments. As such, many modifications and variations will be apparent to practitioners skilled in the art.

Furthermore, it is contemplated that a particular feature described either individually or as part of an embodiment can be combined with other individually described features, or parts of other embodiments, even if the other features and embodiments make no mention of the particular feature. Thus, the invention extends to such specific combinations not already described.

The invention may be performed in various ways, and, by way of example only, embodiments thereof will now be described, reference being made to the accompanying drawings in which: Figure 1 is a front view of a first embodiment of the apparatus.

Figure 2 is a schematic cross-sectional view through line A-A' of Figure 1; Figure 3 is a perspective side view of the first embodiment; Figure 4 is an exploded view of the first embodiment; Figure 5 is an exploded side view of an alternative embodiment, and Figure 6 is an exploded side perspective of an alternative embodiment.

Referring to Figures 1 to 4, there is shown a first embodiment 100 of lighting apparatus. The apparatus includes a light source, which, in the example comprises an LED 102. It will be appreciated that more than one LED could be used, or, indeed, other light sources such as conventional bulbs. The LED 102 in the example is mounted on a ceramic circuit board 104. The end of the LED that is not connected to the circuit board can notionally be considered to be its front end.

The apparatus further includes a fitting component 106 that, in use, is intended to be connected to a suitable aperture/socket where the light is to be positioned. The fitting component 106 can be formed of cast Aluminium or any other suitable material, e.g. ceramic or moulded plastic, but preferably a material having good thermal conductivity.

A central bore 107 passes through the fitting component to allow a power source to be connected to the circuit board 104. There is also a grommet 108 fitted within a receiving portion of the fitting component. It will be appreciated that the shape, design and dimensions of the fitting component can be varied to suit the intended application. For example, the component need not be generally cylindrical in shape.

The outer cylindrical wall of the fitting component 106 is formed to include a heat sink arrangement. In the example the arrangement comprises a plurality of fins 109 that extend across the length/height of the outer walls. In the example there are two sets of fins diametricaUy opposed to each other, but it will be appreciated that variations are possible to the design and number of fins shown, e.g. they could extend in different directions and need not extend completely along the length/height of the outer wall. Also, the heat sink arrangement need not be moulded in the same piece of material as the rest of the lighting apparatus; the heat sink may at least partially comprise separate members that are fixed to other parts of the apparatus.

As shown in Figure 4, the circuit board 104 is fitted on a lower flat/planar surface Ill of the fitting component 106. A reflector component 112 can then be fitted on top of the light source, e.g. fixed by screws 110 or clamped in any other manner, with a flat/planar surface of the reflector contacting the circuit board. Thus, both sides of the circuit board are directly in contact with planar surfaces of the components that include heat-sink arrangements, i.e. the reflector and the fitting component. The reflector 112 can be formed at least partially of a metallised or metal material. The reflector includes a central aperture that is intended to allow the LED 102 to project into an open inner volume of the reflector. The inner surface 114 (which may be replaceable/interchangeable) of the reflector is configured to reflect light emitted by the LED and effectively project it in a forwards direction.

The outer wall of the reflector 112 includes a heat sink arrangement, which, in the example, comprises a plurality of fins 116, with generally corresponding thicknesses and location to the fins on the fitting component 106.

Again, it will be appreciated that variations to the design of the heat sink arrangement are possible. When the reflector 112 and the fitting component 106 are connected together the fins 116 of the reflector and the fins 109 of the fitting component are substantially aligned. This results in the channels between both sets of fins running effectively continuously along the combined height/length of the reflector and the fitting component. Thus, the channels extend in forward and rearward directions with respect to the position of the light source that is sandwiched within the assembled device 100.

In use, heat produced by the LED 102 will be conducted through the fitting component 106 and reflector 112 towards the fins 109, 116. Further, the temperature of ambient air around the lighting device is fitted will typically be lower than the temperature within the open space defined by inner surface 114 of the reflector. This means that convection currents can assist with drawing heat away from the light source 102 and towards the fins of the lighting device.

The resulting heat dissipation is greater than that produced by conventional lighting devices where the heat sink arrangement is located behind the light source only and the thermal mass of the apparatus is larger than conventional lighting devices of a comparable type. Overall, the apparatus can be formed of a relatively low number of easily-produced components, which has manufacturing/cost advantages.

Figures 5 and 6 show an alternative embodiment 200 of the lighting apparatus (corresponding components in the second embodiment are given the same reference numbers as in the first embodiment). In the apparatus 200 the fitting component 106 includes an inner thread 502 that engages with a corresponding thread 504 on the reflector 112 to allow the two components to be secured together with the circuit board/LED sandwiched between them.

Instead of fins running along the height/length of the cylindrical side walls (orthogonally with respect to the central axis) as in the first embodiment, the heat sink arrangement on the fitting device 106 of the second embodiment comprises a set of spaced apart discs 503 that are axially aligned with the centre of the main body of the fitting component. This arrangement effectively provides a heat sink in the form of a set of circumferential grooves.

The reflector 112 of the second embodiment 200 also comprises a set of spaced apart discs 505. Connecting portions 507 of decreasing diameter (beginning from a portion of the reflector remote from the light source) are located between the discs 116. In the example there are three disks located between the connecting portion of the reflector and the opposite end of the reflector. It will be understood that this arrangement can vary, e.g. there may be a different number of disks, the disks may have different diameters and disks may be arranged along the entire length/height of the reflector. The reflector further includes an outer lip 506 that can be used to flush fit the apparatus with another surface.

Claims (23)

  1. CLAIMS1. Lighting apparatus (100/200) including a light source(102) mounted in or on a housing (106, 112), the housing including a reflector (112, 114) for projecting light emitted by the light source and a fitting component (106), the apparatus including heat sink arrangements (109, 116) located in front of and behind the light source within the housing.
  2. 2. Apparatus according to claim 1, wherein the heat sink arrangement (116) is at least partially integrated into the reflector (112).
  3. 3. Apparatus according to claim 1 or 2, wherein the reflector (112) includes an inner surface (114) arranged to reflect light from the light source (102) and an outer wall on which a said heat sink arrangement (116) is located or formed.
  4. 4. Apparatus according to any one of the preceding claims, wherein the reflector (112) is an elliptical or parabolic reflector for forward projection of light from the light source (102).
  5. 5. Apparatus according to claim 3, wherein the inner surface (114) of the reflector (112) defines an open space, such that in use, convection currents resulting from temperature differences between ambient air and heat produced by the light source (102) assist with conducting heat to the heat sink arrangement (116).
  6. 6. Apparatus according to any one of the preceding claims, wherein the housing includes a fitting component (106) configured to fit the apparatus to another body or surface in use.
  7. 7. Apparatus according to any one of the preceding claims, wherein the fitting component (106) includes at least one outer wall that includes at least part of the heat sink arrangement (109).
  8. 8. Apparatus according to any one of the preceding claims, wherein the heat sink arrangement includes a plurality of open channels that extend continuously along an outer surface of the reflector (112) and an outer surface of the fitting component (106).
  9. 9. Apparatus according to any one of the preceding claims, wherein the light source (102) is mounted on a member (104) fitted within the housing.
  10. 10. Apparatus according to claim 9, wherein the member comprises a circuit board (104).
  11. 11. Apparatus according to claim 9 or 10, wherein the member (104) is at least partially sandwiched between a planar surface of the reflector (112) and a planar surface of the fitting component (106).
  12. 12. Apparatus according to claim 11, wherein both sides of the member (104) are directly in contact with planar surfaces of the reflector (112) and the fitting component (106).
  13. 13. Apparatus according to any one of the preceding claims, wherein the reflector (112) is at least partially formed of metal or a metallised material.
  14. 14. Apparatus according to any one of the preceding claims, wherein the heat sink arrangement includes a plurality of fins (109, 116) defining at least one groove/channel that run at least partially along a height/length of the reflector (112) and/or fitting component (106).
  15. 15. Apparatus according to claim 14, wherein the at least one groove/channel runs continuously along at least part of a combined height/length of the reflector (112) and the fitting component (106).
  16. 16. Apparatus according to any one of the preceding claims, wherein the heat sink arrangement includes set of spaced apart members (503, 505) that define circumferential grooves.
  17. 17. Apparatus according to claim 16, wherein the circumferential grooves are axially aligned with a main axis of the apparatus.
  18. 18. Apparatus according to any one of the preceding claims, wherein the housing (106, 112) is fitted together by means of screws (110), a clamping arrangement or a threaded arrangement (502, 504).
  19. 19. Apparatus according to any one of the preceding claims, wherein the light source comprises at least one LED (102).
  20. 20. Apparatus according to any one of the preceding claims, wherein the lighting apparatus comprises a replaceable module or luminaire.
  21. 21. A lighting apparatus reflector (112) including an integrated heat sink arrangement (109, 116).
  22. 22. Lighting apparatus substantially as described herein and/or with reference to the accompanying drawings.
  23. 23. A lighting apparatus reflector substantially as described herein and/or with reference to the accompanying drawings.
GB0815835A 2008-08-30 2008-08-30 Light emitting diode lighting housing comprising a reflector and heat sink Withdrawn GB2463057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0815835A GB2463057A (en) 2008-08-30 2008-08-30 Light emitting diode lighting housing comprising a reflector and heat sink

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0815835A GB2463057A (en) 2008-08-30 2008-08-30 Light emitting diode lighting housing comprising a reflector and heat sink

Publications (2)

Publication Number Publication Date
GB0815835D0 GB0815835D0 (en) 2008-10-08
GB2463057A true GB2463057A (en) 2010-03-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0815835A Withdrawn GB2463057A (en) 2008-08-30 2008-08-30 Light emitting diode lighting housing comprising a reflector and heat sink

Country Status (1)

Country Link
GB (1) GB2463057A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011124666A3 (en) * 2010-04-09 2012-02-02 Tridonic Jennersdorf Gmbh Led module for spotlights
CN102720973A (en) * 2012-07-12 2012-10-10 英飞特光电(杭州)有限公司 Light-emitting diode (LED) lamp
EP2484967A3 (en) * 2011-02-07 2012-10-24 Collingwood Lighting Limited Lighting unit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151829A (en) * 1967-04-18 1969-05-14 Amp Inc Light Fitting Including Light Guides.
US4985815A (en) * 1989-11-29 1991-01-15 Pioneer Electronic Corporation Light reflector
EP1467414A1 (en) * 2001-12-29 2004-10-13 Hangzhou Fuyang Xinying Dianzi Ltd. A led and led lamp
WO2004100265A2 (en) * 2003-05-08 2004-11-18 Koninklijke Philips Electronics N.V. Light-emitting diode system
AU2005100101A4 (en) * 2005-02-03 2005-03-03 Ian James Maitland A lighting unit
WO2005095853A1 (en) * 2004-04-02 2005-10-13 Martin Professional A/S Light source module
EP1923620A1 (en) * 2006-11-14 2008-05-21 Honeywell International, Inc. Solid-state strip lighting system for assembly efficiency and variable beam angle with integral heatsink

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151829A (en) * 1967-04-18 1969-05-14 Amp Inc Light Fitting Including Light Guides.
US4985815A (en) * 1989-11-29 1991-01-15 Pioneer Electronic Corporation Light reflector
EP1467414A1 (en) * 2001-12-29 2004-10-13 Hangzhou Fuyang Xinying Dianzi Ltd. A led and led lamp
WO2004100265A2 (en) * 2003-05-08 2004-11-18 Koninklijke Philips Electronics N.V. Light-emitting diode system
WO2005095853A1 (en) * 2004-04-02 2005-10-13 Martin Professional A/S Light source module
AU2005100101A4 (en) * 2005-02-03 2005-03-03 Ian James Maitland A lighting unit
EP1923620A1 (en) * 2006-11-14 2008-05-21 Honeywell International, Inc. Solid-state strip lighting system for assembly efficiency and variable beam angle with integral heatsink

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011124666A3 (en) * 2010-04-09 2012-02-02 Tridonic Jennersdorf Gmbh Led module for spotlights
US8960952B2 (en) 2010-04-09 2015-02-24 Tridonic Jennersdorf Gmbh LED module for spotlights
TWI480488B (en) * 2010-04-09 2015-04-11 Tridonic Jennersdorf Gmbh Led module for emitters
EP2947372A1 (en) * 2010-04-09 2015-11-25 Tridonic Jennersdorf GmbH Led module for spotlights
EP2484967A3 (en) * 2011-02-07 2012-10-24 Collingwood Lighting Limited Lighting unit
CN102720973A (en) * 2012-07-12 2012-10-10 英飞特光电(杭州)有限公司 Light-emitting diode (LED) lamp
CN102720973B (en) * 2012-07-12 2015-04-29 浙江思朗照明有限公司 Light-emitting diode (LED) lamp

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