WO2011012498A1 - Lampe - Google Patents
Lampe Download PDFInfo
- Publication number
- WO2011012498A1 WO2011012498A1 PCT/EP2010/060475 EP2010060475W WO2011012498A1 WO 2011012498 A1 WO2011012498 A1 WO 2011012498A1 EP 2010060475 W EP2010060475 W EP 2010060475W WO 2011012498 A1 WO2011012498 A1 WO 2011012498A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cover
- heat sink
- lamp
- wall thickness
- contact surface
- Prior art date
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
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
- F21V29/506—Cooling arrangements characterised by the adaptation for cooling of specific components of globes, bowls or cover glasses
-
- 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
- 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
- F21K9/233—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 a spot light distribution, e.g. for substitution of reflector lamps
-
- 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
- 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
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/66—Details of globes or covers forming part of 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
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
- F21V17/101—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening permanently, e.g. welding, gluing or riveting
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/75—Cooling 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
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/76—Cooling 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
- F21V29/763—Cooling 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 the planes containing the fins or blades having the direction of the light emitting axis
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
- F21V29/86—Ceramics or glass
-
- 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
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
-
- 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 invention relates to a lamp which has a heat sink which carries at least one light source, in particular at least one semiconductor light element, as well as a cover attached to the heat sink.
- LEDs light-emitting diodes
- a heat sink is used to dissipate heat or cool the LED (s).
- the available space for the heat sink is limited by a mostly standardized outer contour of the lamp to be replaced and a space required for a piston and a driver electronics. Due to the spatial limitation, the size of the effectively usable for cooling volume of the heat sink is limited and thus the cooling capacity. With the LED lamps with standard-limited size, the power of the light source and thus the brightness are limited according to the limited cooling capacity.
- US 2007/0080362 A1 discloses an LED assembly with a high power LED chip having a first surface and a second surface, the second surface being mounted on a substrate.
- the second surface is in intimate thermal contact with a translucent heat sink having a thermal conductivity greater than 30 W / (m-K).
- Providing the light-transmissive heat sink can double the heat conduction of the LED dies, which extends the life, efficiency or
- Luminosity or a balance of these three increases.
- a lamp which has at least: a heat sink, which carries at least one light source, and a cover or cover element fixed to the heat sink, at least partially translucent (transparent or translucent or opaque) for the at least a light source, in particular a semiconductor light-emitting element, wherein the cover has a wall thickness which tapers at least in sections as the distance from the heat sink increases. In other words, the cover has a wall thickness which increases at least in sections as the proximity to (closer spacing) to the heat sink increases.
- a thick wall thickness at a greater distance from the heat sink or the contact surface does not result in a significantly increased cooling effect due to the laterally distributing (laterally directed) heat flow in the cover, because by the heat dissipation to the environment (heat dissipation) at a greater distance From the contact surface less and less heat arrives through the direct lateral heat conduction. Due to the heat dissipation through the cover or its surface better cooling of the light sources can be achieved without changing the size of the lamp. Herewith can be dissipated without a significant increase in the dimensions of the lamp larger loss lines.
- the type of light source is not limited. However, it is preferred if the at least one light source comprises at least one semiconductor light source, e.g. a light emitting diode or a diode laser. Particularly preferred is the use of at least one light emitting diode as the at least one light source.
- the type of at least one light-emitting diode is not limited, but may be e.g. comprise a plurality of single LEDs or one or more LED clusters of LED chips mounted on a common substrate.
- the color (s) of the at least one light emitting diode is also not limited and may include, for example, 'white'.
- the at least one light-emitting diode may be an inorganic or an organic light-emitting diode.
- the light sources can generally be equipped with downstream optics.
- the cover has a greatest wall thickness at a contact surface to the heat sink. This allows a particularly high heat dissipation from the heat sink into the cover.
- the wall thickness of the cover continuously tapers with increasing distance from the heat sink.
- a continuous reduction of the wall thickness of the cover with increasing distance from the heat sink or the contact surface to the heat sink causes a good compromise between lateral and transversal heat conduction into or through the cover in the different regions of the cover can be realized.
- the wall thickness of the cover tapers in sections with increasing distance from the contact surface to the heat sink and then the wall thickness of the cover remains substantially constant thereafter.
- a small wall thickness of the cover in a region remote from the heat sink, in particular in the greatest distance from the heat sink, is advantageous because there is a decompression to the ambient air largely generated by a transverse heat flow from a heated interior or receiving space and not through the lateral heat flow from the heat sink. The lower the wall thickness of the cover, the more effective the transverse heat flow.
- a small wall thickness of the cover is also advantageous from an optical point of view, since a transmission increases with decreasing wall thickness of the cover and thus at least the radiated brightness is attenuated to a lesser extent. It is still an embodiment that the cover on the
- Heatsink is attached by means of at least one good heat conducting adhesive.
- the use of the adhesive has the advantage that the connection or the contact surfaces between the heat sink and the cover is geometrically simple ausgestaltbar, in particular, the connection to planar contact surfaces is possible.
- the adhesive may be a thermally highly conductive adhesive, e.g. a thermal grease, a thermal adhesive or at least one thermal pad. Generally, the effect of the
- Adhesive be minimized to a heat transfer.
- the invention is not limited to the selection of a thermally well conductive adhesive.
- a small thickness of the adhesive e.g. a thin adhesive layer, an influence of the thermal conductivity coefficient of the adhesive on a heat flow through the adhesive with a sufficiently large contact area for most adhesives low.
- the cover can also be attached to the heat sink by means of mechanical connection means, for example by means of a plug connection or a clamp or clamp connection, etc.
- mechanical connection means for example by means of a plug connection or a clamp or clamp connection, etc.
- a small air gap between be present to the heat sink and the cover If this air gap is narrow enough, with a sufficiently large contact surface, a significant heat transfer through the air gap can also take place.
- the contact surface of the cover is then a purely thermal contact surface or heat transfer surface.
- the cover may also be screwed into the heat sink, the cover being e.g. On its contact surface with the heat sink, a helical shape and the heat sink may have a matching thread shape. This further increases the contact area between the cover and the heat sink.
- the material of the cover basically does not need to be selected according to its thermal conductivity.
- a standard plastic or glass may be used for the cover, e.g. a conventional lamp envelope material.
- a good heat conductive material is preferred. Good heat conduction enhances lateral heat distribution in the cover, increasing the effective cooling area within the cover and allowing more heat to be dissipated to the environment. At the same time, the good heat conduction enhances transverse heat conduction from an inner space surrounded by the cover through the cover.
- the cover is made of glass.
- the use of glass has the advantage that glass is relatively inexpensive, colorable, easy to shape and resistant to aging. Furthermore, glass can simply be roughened or otherwise diffusely scattered in order not to make the light source directly visible from the outside.
- the cover for example, has a thermal conductivity between 1 W / (mK) and 2 W / (mK).
- a thermally conductive Glass with a thermal conductivity coefficient ⁇ of about 1.2 W / (m K) or more preferred.
- a translucent plastic e.g., polycarbonate
- a translucent ceramic e.g., an alumina ceramic
- a translucent ceramic can achieve a thermal conductivity coefficient ⁇ of 30 W / (m K) or more.
- Translucent ceramics can be used in all modifications, for example monocrystalline (that is to say as sapphire in the case of aluminum oxide), quasi-monocrystalline or polycrystalline.
- alumina and here especially sapphire are characterized by a high thermal conductivity, resistance to environmental influences and good availability.
- a plastic for example, a filled with a highly thermally conductive material plastic can be used.
- the cover has a dome-like shape.
- a cover is particularly suitable, for example, for a retrofit incandescent lamp.
- the cover may alternatively have an open or a closed tubular shape.
- a cover is suitable, for example, for a retrofit fluorescent tube or a retrofit line lamp (eg of the Linestra type from Osram).
- a (in particular thermal) contact surface of the cover to the heat sink at least partially corresponds to a (lower) bearing surface of the cover.
- the contact surface of the cover simultaneously represents the bearing surface of the cover on the heat sink and thus usually its lowest point.
- the wall thickness can decrease with increasing distance from the contact surface or with increasing height, in particular reduce it continuously. The highest point, the apse, thus has the lowest wall thickness.
- the cover has a disk-like shape.
- the cover is in particular for a PAR (Parabolic Aluminized Reflector) - headlight retrofit lamp or lamp or for its
- the cover is also particularly suitable for lamps or retrofit lamps of the type MR16, alternatively also for other MR lamp shapes, e.g. MRIl or MR8.
- a contact surface of the cover is arranged laterally to the heat sink.
- the contact surface of the cover at the same time represents the lateral contact surface of the cover (which usually corresponds to the side edge of the cover) on the heat sink and thus usually the outermost point.
- the wall thickness may decrease with increasing distance from the contact surface. The innermost point of the cover, in particular its center, thus has the lowest wall thickness.
- the cover has an optical function. This has the advantage that at the same time a beam guidance or beam correction is made possible. It is an alternative embodiment that the cover is a substantially optically inactive cover, so essentially serves to protect the lamp. It is a further embodiment that the at least one light source, in particular semiconductor light-emitting element, is fastened on the heat sink via at least one substrate.
- the substrate may, for example, be a substrate of an LED cluster, ie a common substrate for a plurality of LED chips.
- the substrate may additionally or alternatively comprise at least one printed circuit board, for example for contacting the LED cluster or at least one single LED (LED module) and possibly for equipping with electronic components.
- the cover has a tubular shape closed at least on the shell side and the cooling body is at least partially received by the cover and at least partially fixed to a lower region of the cover, the lower region of the cover and an upper region the cover has a comparatively smaller wall thickness than the two lateral areas of the cover.
- the cover on its inner side is substantially free of undercuts, that is, has substantially no undercut. This gives the possibility of production by injection molding (plastic) or pressing (glass or ceramic). The inside of the cover limits the interior of the lamp.
- the cover has on its inside at least laterally substantially straight contours. This simplifies manufacturing by injection molding or pressing particularly. It is still an embodiment that the lamp is a retrofit lamp whose outer contour does not or not substantially beyond an outer contour of a lamp to be replaced. In particular for use with a light bulb
- Retrofitlampe it is advantageous that the cover follows in its outer dimensions of the contour, in particular rounding, the bulb to be replaced.
- This is preferably analogous to retrofit lamps for replacing a lamp of conventional type, e.g. a line lamp, reflector lamp, etc.
- a lamp in particular an LED lamp, comprises a socket, a heat sink, an LED module and a semitransparent or transparent cover, e.g. a lamp bulb or a semi-transparent or transparent optics or cover.
- the cover (e.g., the piston / optic / cover plate) is preferably made thicker toward the heat sink and has a wide area or contact surface for thermal connection to the heat sink.
- the cover is preferably over the contact surface by means of a good heat conductive adhesive, e.g. a paste, an adhesive and / or a pad, etc. connected to the heat sink.
- a good heat conductive adhesive e.g. a paste, an adhesive and / or a pad, etc. connected to the heat sink.
- the adhesive may in particular be a TIM (Thermal Interface Material).
- the cover preferably becomes thinner as the distance from the heat sink contact surface increases.
- FIG. 1 shows, in a side view, partly in cross section, a piston retrofit lamp
- Retrofit lamp from Fig.l in the region of a cover 3 shows a side view partially in cross section of a reflector retrofit lamp
- FIG. 4 shows an oblique view of a cross-sectional view of a fluorescent tube or line lamp retrofit lamp
- FIG. 5 shows a front view of a cross-sectional view of the retrofit lamp of Figure 4; and Fig. 6 is a front elevation cross-sectional view of another fluorescent tube or line lamp retrofit lamp;
- FIG. 7 shows a front view of a cross-sectional view of a fluorescent tube or line lamp
- Retrofit lamp according to another embodiment
- FIG. 8 shows a side view partly in cross section of a piston retrofit lamp according to a further embodiment
- FIG. 9 shows a side view partially in cross section of a piston retrofit lamp according to yet another embodiment.
- FIG. 1 shows a partial side view of a light-bulb retrofit lamp 1.
- the incandescent-type retrofit lamp 1 has a heat sink 2 shown in side view, which has an angle-symmetrical shape substantially around a longitudinal axis L of the incandescent light retrofit lamp 1.
- 3 radially outwardly directed cooling fins 4 are provided on the outside of the lateral surface.
- a base 6 for a light bulb socket shown in side view is present, for example, an Edison socket.
- an LED module 8 is fixed, which is powered by the base 6 with power.
- the LED module 8 has at least one substrate in the form of a printed circuit board 9.
- the circuit board 9 may also be additionally populated with other electronic components, e.g. a driver block.
- a dome-shaped cover 11 shown in cross-section is further glued.
- the cover 11 is rotationally symmetrical about the longitudinal axis L and the LED module 8 vaulted over completely.
- the cover 11 and the heat sink 2 a receiving space for the LED module 8 and an interior 12 of the light bulb retrofit lamp 1 is thus created.
- the cover 11 is flat with a lower contact surface 13 by means of an adhesive 14 and flat on the heat sink 2.
- the adhesive 14, by means of which the cover 11 adheres to the heat sink 2, can be realized, for example, as a thin adhesive layer of silver conductive adhesive or an adhesive filled with a conductive ceramic.
- the cover 11 is opaque to support a substantially homogeneous radiation characteristic, which is at least approximate to that of a conventional light bulb.
- the cover 11 has a wall thickness d, which tapers continuously with increasing distance (increasing height) from the heat sink 2. Consequently, the contact surface 13, which simultaneously represents the lower attachment surface of the cover 11, forms the region of the cover 11 with the highest wall thickness d.
- the cover 11 consists of a glass with a thermal conductivity ⁇ in a range between 1 W / (m-K) and 2
- W / (m-K) e.g. a borofloat glass.
- the cover 11 is substantially optically inactive, thus has no function of a lens o.a. on.
- the incandescent retrofit lamp 1 shows a section of the incandescent retrofit lamp 1 in the region of the cover 11. During operation of the LED module 8, this is heated due to heat loss of the LEDs 10 and possibly other electronic components. The heat loss W is partially transmitted to the heat sink 2 and partially discharged into the receiving space 12. The heat sink 2, in turn, transmits the heat W to the environment essentially by heat convection or radiant heat, in particular via the cooling fins 4.
- part of the heat W of the heat sink 2 is transmitted to the cover 11 through the adhesive layer 14 and further through the contact surface 13.
- the heat W spreads by means of a lateral heat conduction (a laterally directed heat flow WL) within the cover 11.
- a laterally directed heat flow WL This emanating from the contact surface 13 warming the cover 11th causes the heat of the laterally directed heat flow WL is discharged via an outer side 15 of the cover 11 by heat convection or radiant heat to the environment, as indicated by the outgoing from the cover 11 outward arrows WL.
- Due to the heated receiving space 12 also a transversely directed heat flow WT from the receiving space 12 occurs substantially vertically through the cover 11 to the outside.
- the two heat flows or heat distributions WL and WT overlap in the cover 11.
- the laterally directed heat flow WL will predominate, and away from the contact surface 13, the transversely directed heat flow WT. Especially at the highest point of the cover 11, the apse A, the influence of the laterally directed heat flow WL is lowest.
- the wall thickness d at each point of the cover can thus be optimized for maximum heat emission to the outside. be miert. Due to the heat fluctuations WT and WL, which typically do not change locally, in most cases a continuous change in the wall thickness d will allow particularly effective heat removal.
- a change in the wall thickness d from the contact surface 13 to the apse A may advantageously be in a range between one-half and one-fifth.
- the wall thickness d at the contact surface may preferably be a factor of two to five times wider than at the apse A, in particular approximately four times.
- Fig. 3 shows in side elevation partly in cross-section another retrofit lamp 16, e.g. for use in an MR16 type lamp or as a PAR illuminant, e.g. PAR 30.
- the heat sink 17 is now cup-shaped with an upper opening 18 is formed.
- the opening 18 is covered by a cover 19 with a disc-like basic shape.
- the cover 19 and the heat sink 17 again form a receiving space 12 for the LED module. 8
- the contact surface 13 does not correspond to a lower support surface but to a lateral edge surface of the cover 19 which is slightly beveled for a secure fit on the heat sink 17.
- a laterally directed heat flow WL is also generated by the heat sink 17 through the contact surface 13 into the cover 19, which becomes weaker the farther it moves from the contact surface 13 is removed or the closer it comes to a center M of the cover 19.
- the laterally directed heat flow WL is also superimposed by a transversely directed heat flow WT, which transports heat out of the receiving space 12 through the cover 19 to the outside.
- the relative influence of the laterally directed heat flow WL is lowest, and consequently that of the transversely directed heat flow WT is greatest, so that for effective heat dissipation from the cover 19 to the environment there, a smaller wall thickness d is preferred than at the edge.
- a greatest wall thickness d at the contact surface 13 or at the edge region of the cover 19 is preferred.
- FIG. 4 shows an oblique view of a cross-sectional view of a fluorescent tube or line lamp retrofit lamp 20.
- FIG. 5 shows the fluorescent tube or linear lamp retrofit lamp 20 in a sectional view in front view.
- the retrofit lamp 20 has a substantially tubular basic shape and is used e.g. as a substitute for a conventional fluorescent tube or a line lamp.
- a lower region of the retrofit lamp 20 has a heat sink 21 which is elongated along a longitudinal axis L of the retrofit lamp 20 and has a plate-shaped base 22.
- a plurality of light-emitting diodes 10 are arranged equidistantly along the longitudinal direction L, e.g. on a flexible band-shaped carrier 9. This can be realized, for example, by an LED module 8 in the form of an LED strip of the type LinearLight Flex from Osram.
- a plurality of cooling fins 4 are perpendicular downward.
- a correspondingly fitting elongated cover 23 is attached, which forms the receiving space 12 for the LED module 8 with the heat sink 21.
- the shape of the cover 23 of the shape of the cover 11 of Fig.l and Fig.2 substantially correspond, so that the operation of the cover 23 at this point does not need to be carried out further, but is referenced analogously to Fig.l and Fig.2.
- FIG. 6 shows a front view of a cross-sectional view of another fluorescent tube or line lamp retrofit lamp 24.
- the heat sink 25 with the LED module 8 is now completely off at least on the shell side surrounded by a tubular cover 26.
- the heat sink 25 is formed of a solid material, so that it forms with the cover 26 a large-area contact surface 27, which occupies a large part of the lower half of the cover 26.
- lateral vertices S have the greatest wall thickness d, while an upper vertex Al and a lower vertex A2 have the lowest wall thickness d. It is assumed that the LED module 8 radiates into an upper half-space and the heat sink 25 is placed on a lower portion of the cover 26.
- the cover 26 has an at least shell-side closed tubular shape, and the heat sink 25 is at least partially received in the cover 26.
- the heat sink 25 is mostly fixed to a lower portion I (lower quarter sector) of the cover 26, wherein the lower portion I and an upper portion II (upper quarter sector) of the cover 26 opposite thereto may have a comparatively smaller wall thickness d than the two lateral portions III (lateral quarter sectors) of the cover 26. Sectorisation is one of them
- Cut line which corresponds to the longitudinal axis L at least substantially.
- the wall thickness d of the cover 26 changes continuously and has the lowest wall thickness d in the upper region I at an upper vertex Al and in the lower region II at a lower vertex A2.
- the two lateral vertices S which are located in the respective lateral region III, the locations of the largest wall thickness d.
- Such a shape of the cover 26 may for example be produced so that a cross-sectional contour of an inner side 28 of the cover 26 is substantially circular, while a cross-sectional contour of an outer side 29 of the cover 26 has a substantially oval shape.
- the cover 26 thus has a wall thickness d for its upper half or its upper portion above the lateral vertices S, which tapers with increasing distance from the heat sink 25 or its contact surface 27 with the heat sink 25.
- FIG. 7 shows in front view a cross-sectional representation of a retrofit lamp 30 in the form of a fluorescent tube or line lamp retrofit lamp according to a further embodiment.
- the inner side 32 (which, together with the base 22 of the heat sink 21, has the structure It is also free of undercuts.
- the inner side 32 is designed in order to simplify a production by injection molding or pressing process such that a lateral surface 33 or side wall of the inner side 32 extends perpendicularly from the lower side of the cover 31.
- a ceiling surface 34 which adjoins the lateral surface 33 upwards and which covers the receiving space 12 is curved again, in particular in the form of a cylindrical sector.
- the wall thickness d is greatest at the contact surface 13 and decreases continuously in a section 35 or region which includes the lateral surface 33 as the distance from the contact surface 13 increases.
- the adjoining section 36 or region which surrounds the ceiling surface 34 contains, however, has a constant wall thickness d. Consequently, the cover 31 continues to have, like the retrofit lamp 20, a greater wall thickness d at the contact surface 13 to the cooling body 21 than at the point furthest from the cooling body 21, namely the (linear) apse A. Specifically, the wall thickness d at the contact surface 13 largest.
- the section 36 can also taper further from its approach on the section 35 to the apse A towards.
- FIG. 8 shows a side view, partly in cross section, of a retrofit lamp 37 in the form of a piston retrofit lamp according to a further embodiment.
- the cover 38 is only hemispherical in shape on its outer side 15, so that it can be released from a casting mold during its production.
- the cover 38 On its inside 32
- the inner side 32 is configured so as to simplify manufacture by injection molding or pressing in such a way that a lateral surface 33 or side wall of the inner side 32 runs perpendicularly from the underside of the cover 31, ie, for example, a cylindrical or cylindrical group of merging groups can have vertical surfaces.
- a ceiling surface 34 which adjoins the lateral surface 33 and which overhangs the receiving space 12, is again arched upwards or domed, in particular spherical, in shape.
- the wall thickness d is greatest at the contact surface 13 and decreases continuously in a section 35 or region with increasing distance from the contact surface 13, which includes the lateral surface 33.
- the cover 38 consequently furthermore has, like the retrofit lamp 1, a greater wall thickness d at the contact surface 13 with respect to the heat sink 2 than at the point farthest from the heat sink 2, namely the (point-shaped) apse A.
- the section 36 can also taper further from its attachment to the section 35 towards the apse A.
- FIG. 9 shows a side view partly in cross section of a retrofit lamp 39 in the form of a piston retrofit lamp according to yet another embodiment.
- the retro-fit lamp 37 it now has no cover 40 with a hemispherical outside, but a more than hemispherical outside 15 as the cover 11 of Fig.l and Fig.2.
- the cover 40 has on its inner side 32 a vertical lateral surface 33.
- the wall thickness d is no longer greatest at the contact surface 13, but at a greatest lateral extent the cover 40 at a small distance from the contact surface 13 and decreases from there continuously with increasing distance from the contact surface 13. But also this cover 40 has at the contact surface 13 to the heat sink 2 has a greater wall thickness d than that of the heat sink the furthest point, namely the (point) apse A.
- This cover 40 has over a cover with a constant wall thickness, in particular a small wall thickness such as in the region of the apse A, the advantage of greater heat dissipation from the heat sink 2.
- the present invention is not limited to the embodiments shown.
- the cover of the shell-side closed tubular cover need not be symmetrical with respect to a longitudinal axis.
- the difference in wall thickness d between the thickest point of the cover and the thinnest part of the cover may generally preferably take a factor between two and five.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/388,031 US8851716B2 (en) | 2009-07-30 | 2010-07-20 | Lamp incorporating a heat sink and an optically transmissive cover |
CA2769496A CA2769496A1 (en) | 2009-07-30 | 2010-07-20 | Lamp |
JP2012522104A JP2013500560A (ja) | 2009-07-30 | 2010-07-20 | ランプ |
CN201080033951.9A CN102472434B (zh) | 2009-07-30 | 2010-07-20 | 灯 |
AU2010277788A AU2010277788A1 (en) | 2009-07-30 | 2010-07-20 | Light bulb |
EP10739320.9A EP2459925B1 (de) | 2009-07-30 | 2010-07-20 | Lampe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009035370.4 | 2009-07-30 | ||
DE102009035370A DE102009035370A1 (de) | 2009-07-30 | 2009-07-30 | Lampe |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011012498A1 true WO2011012498A1 (de) | 2011-02-03 |
Family
ID=42797609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/060475 WO2011012498A1 (de) | 2009-07-30 | 2010-07-20 | Lampe |
Country Status (8)
Country | Link |
---|---|
US (1) | US8851716B2 (de) |
EP (1) | EP2459925B1 (de) |
JP (1) | JP2013500560A (de) |
CN (1) | CN102472434B (de) |
AU (1) | AU2010277788A1 (de) |
CA (1) | CA2769496A1 (de) |
DE (1) | DE102009035370A1 (de) |
WO (1) | WO2011012498A1 (de) |
Cited By (2)
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JP2014524116A (ja) * | 2011-07-15 | 2014-09-18 | コーニンクレッカ フィリップス エヌ ヴェ | キャリア及びエンベロープを備えた照明装置 |
US10208938B2 (en) | 2013-02-19 | 2019-02-19 | Philips Lighting Holding B.V. | Lighting device with improved thermal properties |
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US10125931B2 (en) * | 2008-03-01 | 2018-11-13 | Goldeneye, Inc. | Barrier with integrated self cooling solid state light sources |
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US20130016508A1 (en) * | 2011-07-13 | 2013-01-17 | Curt Progl | Variable thickness globe |
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US8820951B2 (en) * | 2012-02-06 | 2014-09-02 | Xicato, Inc. | LED-based light source with hybrid spot and general lighting characteristics |
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US20140160762A1 (en) * | 2012-12-07 | 2014-06-12 | GE Lighting Solutions, LLC | Diffuser element and lighting device comprised thereof |
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JP6453660B2 (ja) | 2015-02-05 | 2019-01-16 | 株式会社東芝 | 照明装置 |
CN105987352A (zh) * | 2015-03-05 | 2016-10-05 | 深圳市裕富照明有限公司 | 光学扩光件及发光装置 |
JP2016181441A (ja) * | 2015-03-24 | 2016-10-13 | アイリスオーヤマ株式会社 | 照明装置 |
CN107366836A (zh) * | 2017-06-28 | 2017-11-21 | 太仓市普利照明电器有限公司 | 一种两用绝缘照明灯 |
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Also Published As
Publication number | Publication date |
---|---|
DE102009035370A1 (de) | 2011-02-03 |
AU2010277788A1 (en) | 2012-02-23 |
US8851716B2 (en) | 2014-10-07 |
CN102472434A (zh) | 2012-05-23 |
CN102472434B (zh) | 2016-12-28 |
US20120163001A1 (en) | 2012-06-28 |
EP2459925A1 (de) | 2012-06-06 |
EP2459925B1 (de) | 2018-04-11 |
JP2013500560A (ja) | 2013-01-07 |
CA2769496A1 (en) | 2011-02-03 |
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