EP3794276A1 - Led-leuchtenmodul und verfahren zu dessen herstellung - Google Patents
Led-leuchtenmodul und verfahren zu dessen herstellungInfo
- Publication number
- EP3794276A1 EP3794276A1 EP19728578.6A EP19728578A EP3794276A1 EP 3794276 A1 EP3794276 A1 EP 3794276A1 EP 19728578 A EP19728578 A EP 19728578A EP 3794276 A1 EP3794276 A1 EP 3794276A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- cover plate
- light
- plate
- housing
- 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
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/08—Lighting devices intended for fixed installation with a standard
- F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
- F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
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- 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
- F21V15/00—Protecting lighting devices from damage
- F21V15/01—Housings, e.g. material or assembling of housing parts
-
- 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
- F21V31/00—Gas-tight or water-tight arrangements
- F21V31/005—Sealing arrangements therefor
-
- 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
- F21V5/00—Refractors for light sources
- F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
-
- 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
- F21V5/00—Refractors for light sources
- F21V5/08—Refractors for light sources producing an asymmetric light distribution
-
- 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
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
- F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
- F21V19/004—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources by deformation of parts or snap action mountings, e.g. using clips
-
- 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
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
- F21V21/10—Pendants, arms, or standards; Fixing lighting devices to pendants, arms, or standards
- F21V21/116—Fixing lighting devices to arms or standards
-
- 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
- F21V7/00—Reflectors for light sources
- F21V7/0091—Reflectors for light sources using total internal reflection
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- 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
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/10—Outdoor lighting
- F21W2131/103—Outdoor lighting of streets or roads
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- 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
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
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- 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
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements
- F21Y2105/12—Planar light sources comprising a two-dimensional [2D] array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
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- 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 the technical field of light generation by means of light-emitting diodes (LED); LEDs denotes a number of such diodes.
- a luminaire module is the light-generating luminous device or the light-generating luminous means of a luminaire or lamp.
- the luminaire module according to the invention is preferably intended for outdoor use (or "outdoor") and can be provided here in particular in lights for the illumination of roads, paths and squares according to DIN EN 13201.
- the LED lighting module according to the invention can be attached as a light source to a corresponding predetermined street lamp.
- the present invention provides a method for producing such an LED luminaire module.
- the present invention relates to an LED lamp module having a two-part module housing
- this consists of a housing part and a transparent cover plate
- a circumferential side wall is formed so that the housing part, the one side wall or both Side walls and the cover plate together define a hermetically sealed housing interior
- circuit board in which a circuit board is located, on which a number of spaced-apart LEDs sit,
- each individual LED is associated with a secondary optical element which captures the LED light generated by a given LED and directs and focuses in accordance with a predetermined lighting purpose.
- the plastic housing has two essential parts, namely an upper housing part and a cover plate.
- the upper housing part consists of a flat plate, on whose circumference integrally a circumferential side wall is mounted.
- a circumferential side wall that is flush with the side wall on the housing part may or may not also be formed on the circumference of the cover plate.
- These two plastic parts can be connected to each other by means of conventional measures for joining plastic parts, for example by hotstaking, vibration welding, ultrasonic welding, gluing and the like in order to produce a weatherproof module housing.
- the plastic housing may consist of polycarbonate (PC), polymethyl methacrylate (PMMA), glass or a combination of these materials.
- a circuit board on which one LED or several LEDs is / are attached. These LEDs are each associated with a secondary optics element, which is also referred to as a lens.
- Such optical lenses may be mounted on the board, or a number of such optical lenses may be combined into a matrix formed on a planar optical disk.
- Such an optical disk may be made of polymethyl methacrylate (PMMA), polycarbonate (PC) and / or the like and may be secured to the module housing, possibly with the aid of sealing material, to create a seal around the optical disk.
- the LED lamp module described here is provided with a mechanically stable metal frame, with which the two-piece plastic housing is attached to a mast, posts or the like.
- Document EP 2 776 883 B1 discloses a street lamp equipped with LEDs as a light source. Each LED is associated with a light guiding element made of transparent material which modifies the light distribution pattern of the light beams generated by an LED.
- the street lamp is arranged at a given height "H" above the road surface, and it is desired such a light distribution pattern that a street lamp such a road surface can be uniformly illuminated, whose length is about 4.5 times the height "H" and their Width about half the height "H" corresponds.
- This LED light module has
- Frame which has two spaced frame end faces and which sits on the bottom plate and is substantially aligned with the outer periphery thereof;
- LEDs of light emitting diodes and with one, these LEDs or LED groups associated secondary optics, which is the one of the LEDs over a wide
- Luminous flux directs and focuses; and with - A board located in the housing interior with electrical and / or electronic, with operating current, signal voltages and optionally further signals can be supplied components for the supply, control and monitoring of the LEDs; and
- the frame consists of a PMMA material, and on one
- Frame end face a circumferential web is integrally formed, which projects in the direction of the frame height of the frame end face;
- This frame end face is connected by means of ultrasonic welding to the ceiling plate;
- the module housing has a long-term tightness, which ensures that after carrying out a 46 weeks of accelerated aging treatment, while the module housing always at about 50 ° C and per day for one hour under ambient air pressure and 23 hours under one, compared to the ambient air pressure is maintained at 100 mbar reduced air pressure, the atmosphere in the housing interior of the module housing still consists of at least 30 vol .-% of argon from the originally introduced 100% Ar-filling.
- the object of the present invention is a
- Another object of the present invention is to provide a simple, efficient and reliably reproducible method for producing such LED luminaire modules.
- this consists of a housing part and a transparent cover plate
- each of the housing part and / or on the cover plate in one piece a circumferential side wall is formed so that the housing part, the one side wall or both side walls and the cover plate together define a hermetically sealed housing interior
- circuit board in which a circuit board is located, on which a number of spaced-apart LEDs sit,
- each individual LED is associated with a respective secondary optical element which captures the LED light generated by a given LED and directs and bundles it according to a predetermined lighting purpose
- the housing part consists of a suitable material for housing light metal or a zamak alloy
- UV-opaque PMMA material or UV-stabilized PC material UV-opaque PMMA material or UV-stabilized PC material
- Each Sekundäroptikelement has a light guide, which consists of the Abdeckplattenmaterial and which is integrally formed on the board adjacent to the inside of the cover plate;
- the module housing has such a long-term tightness, which ensures that after performing a 46 weeks of accelerated aging treatment, while the LED lamp module always at about 50 ° C and per day for one hour (hrs) long under ambient air pressure and 23 hrs long is maintained at a reduced atmospheric pressure by 100 mbar relative to the ambient air pressure, the atmosphere in the housing interior still consists of at least 58% by volume of the originally introduced 100% Ar charge.
- a housing part which consists of a housing material suitable for light metal or a zamak alloy;
- a cover plate which consists of a largely UV-opaque or UV-opaque PMMA material or a UV-stabilized
- Each Sekundäroptikelement has a light guide, which from the
- Cover plate material is made and which is integrally formed on the board adjacent to the inside of the cover plate;
- LED luminaire module that can be manufactured easily, efficiently and safely reproducibly, and that is designed for a long and maintenance-free service life.
- the LEDs in the LED luminaire module are operated in an environment that can be kept largely or completely free of harmful influences over a very long period of time. It can ensure a lifetime of the LEDs used greater than 100,000 hours (hours). Lifespan refers to the one here
- the LED luminaire module is designed to provide light that comes as close as possible to the daylight provided by the sun. Consequently, LEDs are used which provide white or warm white light, typically with color temperatures between 2700 and 6500 Kelvin (K), in particular with color temperatures of 3000 or 4000 or 5000 Kelvin (K).
- the LED semiconductor chip produces narrow-band blue-light ("royal blue") at a wavelength of 442 nm (nanometers), which has to be converted by fluorescence into a broad yellow light in order to produce cold-white (color temperatures of about 5,000) to 6000 K) to warm white (color temperatures of about 2000 to 3000 K) to deliver light.
- This fluorescence provide selected powdery, yellow to orange phosphors, such as cerium-doped yttrium-aluminum garnet, which are applied as a layer on the LED semiconductor chip.
- This phosphor layer is covered with a layer of a silicone material, or encapsulated with this silicone material.
- This silicone encapsulant is particularly close to the LED semiconductor chip and is exposed to the heat generated by the LED semiconductor chip and "high photon energy" during operation of the LED.
- This silicone encapsulating material is a lens or a dome of further silicone material with which the emission of the light emitted by the LED is already directed and controlled to a limited extent in terms of primary optics; This latter silicone material is also referred to as silicone lens material.
- This two silicone materials are not damaged by the blue light generated by the LED semiconductor chip with an emission maximum at about 442 nm.
- incompatible organic compounds that can gase from various sources, such as adhesives, coatings on a circuit board, certain brazing materials, and so forth, may be present in the interior of the enclosure from sealants and seals, such as O-rings and the like. These VOCs diffuse into these silicone materials, settling in voids between the silicone polymer chains and are confined there.
- white light-generating LEDs are typically operated in a water and water vapor-free inert gas atmosphere, such as argon.
- UV components of the sunlight can also have harmful effects on white light-generating LEDs, of which precisely these VOCs can be affected.
- white light-generating LEDs of which precisely these VOCs can be affected.
- Street lamp is the transparent cover plate, although not directly exposed to sunlight, but facing the ground. Nevertheless, scattered and / or reflected sunlight can penetrate through the transparent cover plate into the interior of the module housing and cause long-term damage to the silicone encapsulation material, to the silicone lens material and / or to the VOCs trapped in these silicone materials.
- An important aspect of the present invention is therefore to prevent the penetration of harmful UV components of the sunlight in the interior of the module housing, which is why the cover plate including integrally formed thereon Sekundäroptiketti from a substantially UV-opaque or from a completely UV impermeable, transpar pensions plastic is made.
- a largely UV-opaque or UV-opaque PMMA material or a UV-stabilized PC material is provided here. Specifically, materials are selected which not only provide the required UV protection but also for the LED light produced G
- the LED lighting module according to the invention has a module housing consisting of two components; the one component is a plate-shaped, consisting of metallic material housing part, which is hereinafter referred to only briefly as a metal housing plate.
- This metal housing plate may be made of a light metal or a zamak alloy. As is known, such metals are called light metals which have a density of less than 5.0 g / cm 3 .
- light metals which have a density of less than 5.0 g / cm 3 .
- light metals are suitable for housing materials light metals into consideration, which form a permanently protective and weather-resistant surface layer of ambient air, here in particular light metals based on aluminum (AI), magnesium (Mg), titanium (Ti) and beryllium (Be) ,
- the metal housing plate preferably consists of a
- Housing material selected from a group comprising:
- Al-Si alloys with an Si content of 10.0 to 13.0% and smaller amounts of Mg, Fe, Mn, Ni, Zn, and / or TI typically less than 0.5%
- the - Zamak alloys which may contain in addition to the main component Zn smaller proportions of Al, Cu and / or Mg. From these housing materials castings can be obtained in the metal injection molding process, where even small details with dimensions of 0.1 mm can be faithfully and reproducibly realized.
- the castings have a relatively low weight, are corrosion resistant and weatherproof and have a good thermal conductivity.
- suitable housing parts can also be obtained by deep drawing of precursors.
- the Al alloy "6061 -T6 aluminum”, which contains 0.8 to 1.2% Mg and 0.4 to 0.8% Si as main alloying elements, is particularly preferably used as the light-metal housing material. Mechanically stable and durable castings with very fine details can be produced, even in the order of 0.1 mm; the castings have a comparatively high thermal conductivity up to about 170 W / (m K) for Al castings.
- the second component of the module housing according to the invention is a transparent cover plate, to which a number of light guide elements consisting of the cover plate material are integrally formed and integrated.
- a cover plate material is largely UV-opaque or UV-opaque PMMA material; PMMA stands for polymethylmethacrylate.
- UV opaque means here that more than 99% of the incident UV radiation with a wavelength less than or equal to 400 nm is absorbed and blocked.As an alternative cover plate material UV-stabilized PC material is considered, PC stands for polycarbonate.
- UV stabilized here means that the PC material in the mass is provided with a UV stabilizer that blocks incident UV radiation.
- the cover plate including the light guiding elements forms a body with complex three-dimensional contour and must be produced by injection molding of fusible starting material; typically pulp-shaped or pellet-shaped starting materials are used.
- fusible starting material typically pulp-shaped or pellet-shaped starting materials are used.
- Substantially UV-opaque or UV-opaque, pellet-shaped PMMA material and UV-stabilized pellet-shaped PC material is commercially available.
- the cover plate has been injection molded from a granular PMMA material marketed by CHI MEI CORPORATION, San Chia, Jen Te District, Tainan City, TAIWAN under the trade name PMMA ACRYREX® (ACRYREX is a Registered Trade Mark).
- This PMMA material has a density of 1 19 g / cm 3, a tensile strength of 67 MPa, a Vicat softening temperature of 107 ° C and a refractive index of about 1, 49.
- the material is available in the form of a granulate having a mean grain size of 3 mm.
- the granules are heated to a temperature of about 220 ° C and thereby forms a mitelviskose melt.
- This melt is processed under a pressure of about 700 bar to form a plate-shaped injection-molded body. After cooling, a fine machining is performed on this body to obtain a provided with light guide Abdeckplate surface having rounded Eckenberei surface and broken edges.
- a UV stabilized PC material well suited for the present purposes is sold by CHI MEI CORPORATION, 59-1, San Chia, Jen Te, Tainan City 71702, Taiwan under the trade designation "WONDERLITE PC” (WONDERLITE® is a registered trademark) ;
- WONDERLITE PC WONDERLITE® is a registered trademark
- the UV-stabilized WONDERLITE PC materials PC-110U, PC-115U and PC-122U are particularly suitable. These materials have u.a. on:
- light guide elements are integrally formed and integrated with the transparent cover plate.
- An LED would be the first LED light beams typically evenly in all spatial directions of a radiating out of a hemispherical space.
- the light guide elements preferably provided here provide on the way of these first LED light beams transparent material with high refractive index, which modifies the light distribution pattern of these first light beams so that finally a rectangular
- Road surface can be uniformly illuminated, which has a comparatively long length and a comparatively small width; typically this length is eight to ten times the width.
- a number of identical light guide elements are integrally formed on the inside of the cover plate adjacent to the board, all of which are arranged in the same arrangement or orientation. All light-guiding elements produce the same light distribution pattern. It is sufficient to describe a single light guide.
- a particularly preferred light guide according to the invention forms on the inside of the cover plate an additional flat, approximately parallelepiped-shaped laminated body having a length of about 25 mm, a width of about 20 mm, a thickness of about 3 to about 4 mm and a laminated surface; wherein in this laminated body, a first cavity and two second cavities are formed, which are all open to the laminated surface.
- “about” is meant a range of 10% smaller to 10% greater range of the specified value; a width of about 20 mm thus includes widths of 18.0 to 22.0 mm
- the first cavity is arranged in the center of the light-guiding element, forms the focus of the light-guiding element and serves to receive an LED; the composite surface then abuts the circuit board.
- the larger second cavity has a convexly curved with respect to the focus and inclined relative to the Abdeckplattenebene contour whose apex is directed to the focus.
- the smaller second cavity has a respect to the focus moderately convex curved and opposite the Abdeckplattenebene obliquely Asked contour whose apex the focus is too focused. On the surface of these contours, a total reflection of LED light rays takes place, which hit from the interior of the composite body on these surfaces.
- the laminated body has two longer parallel planar sides whose direction or extension defines a long-side direction and an orthogonal short-side direction of the light-guiding element. Further, above each
- the LED light beams passing through the cover plate are deflected toward the longitudinal center of the road surface to be illuminated.
- a light guide having all of these features optimally modifies the LED light distribution pattern for the purpose of street lighting and can be used for all the street-grade LEDs on the market.
- an inventive LED lighting module which is equipped with a number of LEDs, wherein the LED light of each LED is modified with a light guide of the type described above, at least the road surface luminance can be obtained for dry and wet road surfaces, according to DIN EN 13201 -2 is required for the Me lighting classes Me5 and Me6.
- an alternative cover plate can be used with alternative light-guiding elements.
- the essential difference is that the convex contours of the light guide element described above are replaced by truncated cone lateral surfaces and conical surface areas in the case of the alternative light guide element.
- the desired for a street lighting asymmetric luminance distribution can be further increased.
- a flat lens design can be realized in which otherwise trapped in the module housing LED light is directed back in the light guide in other useful directions, whereby the luminous efficacy - over conventional lights of this type - can be increased by up to 7%.
- the LED lighting module according to the invention has a closed, hermetically sealed module housing in which a number of LEDs can generate LED light. Each luminous LED converts about 2/3 of the supplied electrical energy into heat. Excessive heating of the LEDs and the module housing must be avoided in order not to affect the useful life of the LEDs.
- the LED lighting module according to the invention is to be mounted on the back of the metal housing plate on the back of the street lamp.
- each pair of flanges enters a recessed there, complementary groove having such dimensions that a pressing pressure between the groove flanks and the outer edges of the incoming flange pair is generated.
- This pressing pressure ensures a particularly good, unobstructed heat transfer between the metal housing plate on the LED luminaire module and the relatively large back part of the street lamp.
- an adhesive selected from a group comprising:
- a first adhesive 10 parts by volume of methyl methacrylate A component and 1 part by volume of peroxide B component;
- a third adhesive of 1 part by volume of 2-cyanoacrylic acid ethyl ester A component and 1 part by volume of epoxy resin component is sold, inter alia, by Adchem GmbH, 90530 Wendelstein, DE under the trade name ACRALOCK® (ACRALOCK® is a registered trademark); According to the invention, in particular the product
- ACRALOCK SA 10-05 LV It is a primerless metal and plastic adhesive, which is excellently suitable for bonding AI and plastics such as PMMA and PC.
- the peroxide-induced radical polycondensation provides a fully reacted, cured product that does not release volatile organic compounds (VOCs).
- VOCs volatile organic compounds
- the cured adhesive is impact resistant, UV stable and shows very high weather resistance
- the second adhesive is sold, inter alia, by Permabond Engineering Adhesives Ltd, Hampshire, UK under the trade name Permabond® (Permabond® is a registered trademark); According to the invention, in particular the products "Permabond TA4202" (with a lower viscosity and a maximum gap filling capacity of up to 0.5 mm) or “Permabond TA4200” (with a higher viscosity and a maximum gap filling capacity of up to 4 mm) are used.
- the third adhesive is one of Henkel AG & Co. KGaA,
- LOCTITE® is a registered trademark
- the products “LOCTITE HY 4080” and “LOCTITE HY 4090” are used.
- the adhesives show good gap filling capacity and are also suitable for applications that are exposed to high temperatures and / or high humidity.
- the product ACRALOCK SA 10-05 LV is used with particular preference as the peroxide-induced free-radical polycondensation gives a fully reacted cured product which releases no volatile organic compounds or components (VOCs).
- the inventively provided luminaire module housing should have a particularly high long-term tightness.
- a certain inventively designed adhesive joint in the peripheral region of light metal housing plate and cover plate is provided.
- a stepped bottom sloping peripheral base is integrally formed, on which an upright, continuous and continuous three-flange sealing contour sits, which is integrally formed on the base and which has - adjacent and spaced from the edge of the plate inside - a Outer flange, a spaced center flange and a spaced inner flange;
- a circumferential and continuous three-groove sealing zone is formed, which has an outer groove, a center groove and an inner groove, and this three-groove sealing zone complementary to the three Flange sealing contour is formed on the metal housing plate;
- Three-flange sealing contour and three-groove sealing zone a continuous gap is formed, which is filled with a continuous adhesive strand.
- this adhesive strand extends continuously from a first adhesive strand level in the outer groove parallel to the cover plate plane to a second adhesive strand level parallel to the cover plate plane in the inner groove.
- a first and / or second adhesive strand level which is parallel to the plane of the platen, can not be visually perceived so that the adhesive introduced to produce the adhesive bond does not cause any visible soiling. Since the second adhesive strand level adjoining the interior of the housing has a comparatively small cross-sectional area, typically less than 1.2 cm 2 , appreciable emergence of VOCs from the polymerized and cured adhesive at this adhesive cross-sectional area is not to be expected.
- a comparatively long uninterrupted adhesive strand is formed between the first adhesive strand level and second adhesive strand level, which presents an insurmountable resistance to the escape of argon from the housing interior and / or the entry of air and moisture from the external environment into the housing interior. It is obtained a particularly high long-term tightness of the module housing.
- the hermetically sealed housing interior which is bounded by the metal housing plate, cover plate and adhesive connection, there is a printed circuit board on which a number of LEDs are seated.
- a glowing LED converts about 2/3 of the energy into heat.
- the mitlere operating temperature of a luminous LED should not exceed about 85 ° C, not their useful long-term operation
- the LED luminaire module according to the invention has a comparatively small housing interior. In order nevertheless to avoid excessive heating of the luminous LEDs, according to the invention it is preferably provided that
- the board has such dimensions that for each power LED at least a board area of 5 to 9 cm 2 is available.
- Middle power LEDs suitable for the purposes of the present invention are sold, for example, under the trade name LM101A by Samsung Electronics Co., Ltd., Yongin-si, Gyeonggi-do, 446-71 1 KOREA; such medium power LEDs from the LM101A series are offered, for example, with color temperatures of 6500 to 2700 Kelvin.
- the board consists of a good heat-conducting material, such as the preferably used Al alloy "6061 -T6 aluminum", and this board rests good thermal conductivity of the metal housing plate, which in turn has good thermal conductivity of a light alloy Luminaire back of sufficient size is applied, can be achieved with such board dimensions good dissipation of the resulting during operation of the LEDs process heat, so that without consuming heat management and / or additional cooling measures even with hours of operation of the LEDs their heating to temperatures above 80 ° C. safely avoided. It is possible to achieve a high usable lifetime of the LEDs of 100,000 operating hours and more; the operation of the LEDs at limited
- Power consumption of less than or equal to about 3 watts (W) of the LEDs increases their efficiency, improves their efficiency and extends the useful life of the LEDs.
- a circuit board is placed within the housing interior on the bottom plate of the metal housing plate;
- a mounted on the board LED forms a point-like heat source, which can typically reach an operating temperature of about 85 ° C. From this heat source emanating from a heat propagation cone.
- Base plate inserted graphite foil spreads and expands this heat propagation cone, thus improving the heat dissipation of the light-emitting LED through the metal housing plate to a solid, light alloy back of a street lamp.
- a circumferential and continuous three-groove sealing zone is formed on the cover plate - adjacent and spaced from the side wall on the inside - has an outer groove, a center groove and an inner groove.
- a liquid or plastic adhesive is introduced into the center groove of the three-groove sealing zone, namely a curing at room temperature 2-component acrylate adhesive based on acrylic acid ester, with a hermetically sealed adhesive bond between metal Housing plate and cover plate is generated.
- 2-component acrylate adhesive is a 2-component acrylate adhesive
- Methacrylic acid methyl ester base is used, which is cured by peroxide-induced radical polycondensation.
- the cover plate provided with this adhesive is brought into abutment with the metal housing plate until a cover plate sidewall end face abuts a socket on the metal housing plate.
- this system can be supported by exerting mechanical pressure on the cover plate, while the metal housing plate is held stationary; preferably, a compressive force of up to 100 N can be exerted.
- a continuous gap is formed between three-flange sealing contour and three-groove sealing zone, which is filled with a continuous adhesive strand.
- such an amount of adhesive is introduced to form an adhesive strand that extends continuously from a first level of adhesive strand parallel to the plane of the plate to a second plane parallel to the plane of the adhesive strand in the inner groove, each at the three-groove sealing zone ,
- this leak test is an exclusion criterion; faulty module housings can be detected and eliminated.
- the module housing may preferably be heated to a moderately high temperature of about 50 to 80 ° C before and during the leak test, and the pressure reduction may be performed for a while. With the help of such a treatment even persistently adhering VOCs can be removed from the housing interior of the module housing. The expected during a long service life of a high-power LED color change of the emitted light and a decrease in light output can be further slowed down
- an LED luminaire module can be provided with such a module housing, which has a long-term sealing, which ensures that after carrying out a 46 weeks accelerated aging treatment, while the module housing always at about 50 ° C and a day per hour. Is maintained under ambient air pressure for 23 hours and under a reduced air pressure of 100 mbar (millibars) relative to the ambient air pressure, the atmosphere in the housing interior of the module housing still amounts to at least 58% by volume of argon from the originally introduced 100% -igen Ar-filling exists.
- the white light-generating LEDs in an LED luminaire module according to the invention can also be operated under a protective atmosphere for a long service life of at least 20 years.
- FIG. 2 shows the LED luminaire module separate from the street lamp on the basis of an oblique image exploded view
- Fig. 3 based on an oblique image exploded view of the essential components of the LED lamp module, namely metal housing plate, board with
- FIG. 4a is an oblique view of the back of the metal housing plate.
- Fig. 4b is an oblique view of the visible side of the metal housing plate
- Fig. 4c is an oblique view of the outside of the transparent cover plate
- Fig. 4d is the sectional view taken along section line B-B of Fig. 4c;
- Fig. 5a is a fragmentary, greatly enlarged sectional view of a
- Fig. 5b is a fragmentary, greatly enlarged sectional view of a
- 5c is a fragmentary, greatly enlarged sectional view of the gap
- Fig. 6a is a ratio of 1: 4 enlarged view of a plan view of a
- FIG. 6b is a sectional view taken along section line AA of FIG. 6a;
- FIG. Fig. 6c is a plan view of four adjacent light-guiding elements according to Fig. 6a;
- Fig. 6d is an oblique view of the cover plate, on the inside of a number of adjacent light-guiding elements is integrally formed;
- Fig. 9 shows five spectra of, located in the interior of the module housing gas compositions on different days in the course of a
- Interior of a module housing contained gas composition during the expected life of the LED lamp module
- 16a shows an alternative cover plate with alternative light-guiding elements
- Fig. 16b is a plan view of a single insulated alternative light guide element, enlarged in scale 1: 4;
- 16c is a sectional view taken at a section along the section line A - A '
- FIGS. 16d and 16e each show an orthogonal side view of the alternative
- FIG. 16b shows, with reference to a diagram, the different luminance distribution that can be obtained when using the alternative cover plate in the one hand of the CO-C 180 direction and on the other hand of the C90-C270 direction.
- the LED luminaire module according to the invention is preferably used as a light-generating element or as a lamp in a street lamp.
- the Applicant has developed street lights of different dimensions,
- a "small street lamp” typically placed at a height of 4 to 6 m above the surface to be illuminated, equipped with 12 medium-power LEDs, and a light flux up to approximately 4400 when receiving 35 W of electrical power Im delivering;
- a "medium-sized street lamp” typically located at a height of 6 to 10 m above the surface to be illuminated, equipped with 36 medium-power LEDs, and capable of producing a luminous flux of up to 12,500 lm when receiving an electrical power of 100W supplies;
- a "large street lamp” typically placed at a height of 8 to 14 m above the surface to be illuminated, equipped with 64 medium-power LEDs, and a light flux up to approximately 22,500 when receiving an electrical power of 180W Im delivering.
- the street lamp 1 shows a street lamp 1, which can be attached at different angles to a vertically oriented mast 2.
- the street lamp 1 has a back part 3 on which each detachably a service part 4 and an inventive LED lamp module 5 can be attached;
- the service part 4 contains transformers, rectifiers, driver Circuits and other elements of the LED power supply, as well as Signalemp- catch-, control and control electronics and is provided with an adjustable bracket, via which the entire street light 1 to the mast 2 can be fastened.
- 2 shows, in a kind of exploded view, the LED luminaire module 5 which is separate and remote from the back part 3.
- the LED luminaire namely, a metal housing plate 10 and a transparent cover plate 60, is short.
- Metal housing plate 10 and cover plate 60 define a housing interior 9 within the module housing 8.
- FIG. 3 shows in a kind of exploded view the metal housing plate 10, the cover plate 60 separate and removed from the housing plate 10 and therebetween one equipped with a number of LEDs 44 Board 40 which is placed on a flat plate bottom 22 of the metal housing plate 10 and fastened there.
- 2 and 3 show the metal housing plate 10 and the cover plate 60 in an arrangement in which the LED lamp module 5 located on the street lamp 1 could illuminate a road surface.
- FIGS. 4a and 4b show the metal housing plate 10 in a reverse arrangement, showing more details;
- Fig. 4c shows the cover plate 60 in another view;
- Fig. 4c shows a schematic sectional view of a portion of the cover plate, on the inside of a Lichtleitelement is integrally formed, and on the outside of the same surface to the light guide curvature is formed.
- This metal housing plate 10 consists of a light metal suitable for housing materials or of a zamak alloy, typically made of Al, an Al alloy, or an Al-Si alloy, can be painted and has a Essentially rectangular shape.
- this metal housing plate 10 has a length of about 250 mm, a width of about 220 mm and a thickness of less than 20 mm.
- the Metal housing plate 10 has a visible side 15 located in the illustration according to FIG. 3 and a rear side 16 located at the top thereof.
- integrally formed on the rear side 16 of the metal housing plate 10 are paired flanges 17 and 17 '.
- the two flanges 17 and 17 'of a pair of flanges are separated by a gap 19 and away from each other.
- the two flanges 17 and 17 'of a pair of flanges have such dimensions and mechanical strengths that they can be deformed a little when exposed to considerable forces on each other
- the two outer edges 18 and 18' of a pair of flanges are slightly inclined to a vertical to the housing plate plane and each other too inclined.
- Each pair of flanges is associated with a groove recessed in the bottom of the back part 3 of the street lamp 1, which has such dimensions, which in the case of considerable force insertion of a pair of flanges into the associated groove, the outer flanks 18 and 18 'sliding against their flanks are easily deformed towards each other. It should be achieved under pressing pressure system of the outer edges 18 and 18 'of a pair of flanges on the groove flanks of the grooves in the back part 3, which promotes the heat transfer from the metal housing part 10 to the back part 3 of the street lamp 1.
- each corner region of the metal housing plate 10 is ever a hole 13 recessed, through which a screw can be performed, with which the LED lamp module 5 can be attached via its metal housing plate 10 on the back part 3 of the street lamp 1 under considerable contact pressure; the areas to be planted should be bare and bare in order to allow a good, unobstructed heat transfer.
- a flat recess 20 which is open towards the visible side 15 is formed in the metal housing plate 10, which is bounded by a flat plate bottom 22 and a peripheral plate edge section 25 which has a plate edge inner circumference 26.
- the recess 20 has a rectangular shape with straight side surfaces and rounded corners; in the case of the here considered th LED lamp module for a "small street lamp” has this recess 20 has a length of about 170 mm, a width of about 145 mm and a depth, which is the distance from the plate bottom 22 to the flat surface of the plate edge portion 25, of about 7 mm.
- the plate edge inner circumference 26 is followed by an integrally formed circumferential base 27, which forms a sloping to the plate bottom 22 stage.
- On this base 27 sits - adjacent and spaced from the plate edge inner circumference 26 - an integrally formed on the base 27 upright, circumferential and continuous three-flange sealing contour 30, which - considerably enlarged - is shown with Fig. 5b and will be explained in detail below.
- a board 40 is prepared on which a number of LEDs 44 are mounted.
- This board 40 may consist of a 1.5 mm thick Al plate, on which there is an insulating coating, on which the tracks of an electrical circuit are applied; in the case of an LED luminaire module according to the invention for a "small street lamp", this Al plate can have, for example, dimensions of 130 mm ⁇ 120 mm.
- the LEDs are arranged in several rows, which are aligned parallel to the longer side of the board.
- medium power LEDs are used, which are each operated with a power consumption of less than or equal to 3 watts (W).
- Each LED 44 can be arranged in the focus of a cuboid light-guiding element, which in the context of the present invention preferably has dimensions of approximately 20 mm ⁇ approximately 25 mm and rests on the board 40. Without costly temperature management, effective dissipation of the operating heat of a luminous mid-power LED operated under the above conditions can be achieved if each LED to each adjacent LED maintains a distance greater than 20 mm and the board 40 has dimensions such that each individual LED is at least a board area of 5 to 9 cm 2 is available.
- the leading to the LEDs 44 traces are connected to fittings 45.
- thermosensors 47 are attached to the circuit board, which are connected to contact 48 pieces.
- the board 40 and / or within the housing interior apart from the above-mentioned components, such as LEDs 44, thermal sensors 47 and connecting and contact pieces 45, 48 no further, during normal operation heat generating provided electrical and / or electronic components. Rather, such components, including transformers, rectifiers, driver circuits and the like.
- the service part 4 which is attached to, consisting of good heat-conducting light metal street lights back 3.
- the thus prepared board 40 is placed within the three-flange sealing contour 30 on the plate bottom 22 of the metal housing plate 10. Between board 40 and
- a graphite foil 23 are inserted to improve the heat transfer between board 40 and metal housing plate 10.
- the board 40 With the aid of a number of screws 42 which are screwed into, in the metal housing plate recessed Sackboh ments, the board 40 is tightly and firmly pressed against the flat plate bottom 22.
- a cable pair 46 is connected, via which the seated on the board 40 LEDs are supplied with power and voltage.
- the signals of the thermal sensor 47 are supplied via conductor tracks of the electrical circuit to the contact piece 48, to which in turn a conductor bundle 49 is connected.
- a typical conical compression fitting has an externally threaded tube which is threadable into an internal thread in the plate bottom 22 of the metal housing plate 10 and then secured with a nut screwed onto the external thread; such a nut 50 is shown in Fig. 4a at the back 16 of the metal housing plate 10.
- a first round post 52 and a second round post 55 are integrally formed on the bottom plate 22, each associated with a respective counterpart 53 and 56 on the back 16 of the metal housing plate 10.
- a threaded bore 54 and 57 is guided.
- Argon can be introduced into the housing interior 9 through the one bore 54, and the gas located in the housing interior 9 can simultaneously exit through the other bore 57, while argon (Ar) is introduced.
- the composition of the exiting gas can be detected, and the Ar introduction can be terminated when the outgoing gas consists only of Ar.
- this Abdeckplate 60 consists of a transparent plastic, namely a largely
- UV-opaque or UV-opaque PMMA material or from one
- the Abdeckplate 60 has a rectangular shape with longer sides 61 and 61 ', with shorter sides 62 and 62' and with rounded corner areas.
- the orientation or extent of the longer sides 61, 61 ' defines a parallel cover plate longitudinal direction; the orientation or
- the longer sides of the board 40 are aligned parallel to Abdeckplatten- longitudinal direction.
- the cover plate longitudinal direction extends in the longitudinal direction of the street light 1
- the cover plate transverse direction extends in the longitudinal direction of the road surface to be illuminated.
- the cover plate 60 has an inner side 63 adjacent to the metal housing plate 10 and an outer side 64 spaced therefrom. On this inner side 63, light guide elements 80 are integrally formed on the cover plate 60
- a circumferential uninterrupted side wall 65 which protrudes perpendicular to the Abdeckplaten- level of the cover plate 60.
- This side wall 65 has a flat side wall end surface 66.
- This housing interior 9 can be hermetically sealed by means of a specific seal and then filled with argon.
- This particular seal comprises an uninterrupted circumferential one integrally formed on the metal housing plate 10 adjacent to its plate edge portion 25
- Fig. 5a shows in a considerably enlarged sectional view fragmentary the three-groove sealing zone 70 on the cover plate 60;
- FIG. 5b shows in a considerably enlarged sectional view fragmentary the three-flange sealing contour 30 on the metal housing plate 12;
- FIG. 5c illustrates three-flange sealing contour 30 and three-groove sealing zone 70 intermeshed together with additional adhesive therebetween to provide a hermetically sealed adhesive bond and seal between cover plate 60 and metal housing plate 10.
- FIG. 5 b shows a section of the metal housing plate 10 with a plate edge section 25, a plate edge inner circumference 26 and a base 27, which drops in a stepped manner to the plate bottom 22.
- a portion of the graphite foil 23 and the circuit board 40 can be seen.
- On the base 27 are integrally formed and project from this perpendicular to the top of the outer flange 32 at a distance from the plate inner circumference 26, the tapered here Mittelflansch 34 spaced from the outer flange 32 and the inner flange 36 at a distance from the center flange 34.
- Jardinflansch 32 and réelleflansch 36 haben a matching rectangular cross-section.
- Three-groove sealing zone 70 Fig. 5a shows a sectional view of an edge portion of the cover plate 60 with side wall 65 and spaced first circumferential flange 68, both of which together define an outer groove 72. Further, a center groove 74 is bounded by this first flange 68 and a second circumferential flange 69 spaced therefrom. Finally, this sealing zone 70 includes an internal groove 76 which is bounded by the second flange 69 and raised surfaces on the inside 62 of the cover plate 60.
- the external groove 72 has dimensions such that the outer flange 32 of the three-flange sealing contour 30 is at play the metal housing plate 10 can be inserted into this outer groove 72.
- the center groove 74 has such a shape and dimensions that with play of the center flange 34 of the three-flange sealing contour 30 on the metal housing plate 10 in this center groove 74 is insertable. With respect to the plate plane of the cover plate 60 inclined surfaces of center flange 34 and center groove 74 produce when attempting to adjust the cover plate 60 against the Me tall housing plate 10 a shear stress on the inserted between these surfaces sealant; As is known, the sealants used here counteract such shear stress particularly high resistance, which is an adjustment of the
- the inner groove 76 has such dimensions that the inner flange 36 of the three-flange sealing contour 30 on the metal housing plate 10 with play in this inner groove 76 can be inserted.
- Fig. 5c shows a sectional view in a much larger scale in Fig. 5b and 5a indicated and nested components of three-flange sealing contour 30 and three-groove sealing zone 70.
- the side wall 65 on the cover plate 60 has a bit greater length than center flange 74 and inner flange 76; the abutment of sidewall end surface 66 with pedestal 27 limits the insertion of three-flange sealant 30 into complementary three-flange seal zone 70 leaving a narrow gap between opposing surfaces; Typically, the remaining gap may have a gap width of about 0.2 to about 0.5 mm.
- the initially freshly prepared 2-component acrylate adhesive in liquid or plastic form into the center groove 74 has a viscosity-dependent gap fill, travels in the remaining gap and forms a continuous cured adhesive strand 77 between an adhesive strand level 78 in the outer groove 72 and another level of adhesive bead 79 in the inner groove 76.
- the amount of adhesive introduced is selected to provide a flat, parallel to the plane of the adhesive layer 78 or 79 of the entire adhesive strand 77 in both the outer groove 72 and the inner groove 76.
- Such adhesive strand levels 78 and 79, which are parallel to the plane of the board, can not be seen from the outside, so that visible contamination by the incorporated adhesive is avoided.
- the migration of the freshly prepared, liquid or plastic adhesive in the entire gap can be promoted by the fact that during the bonding process, the metal housing plate 10 is held stationary and at the same time on the cover plate 60 mechanical pressure is applied, for example, a compressive force up to 100 Newton ( N) to bring the side wall end surface 66 on the cover plate 60 to rest against the base 27 of the metal housing plate 10.
- a compressive force up to 100 Newton ( N) to bring the side wall end surface 66 on the cover plate 60 to rest against the base 27 of the metal housing plate 10.
- a continuous cured adhesive strand 77 may be formed a, parallel to the board level adhesive strand level 78 in the outer groove 72 to a plane parallel to the board level adhesive strand level 79 in the inner groove 76 extends.
- Such a long adhesive strand 77 provides an insurmountable resistance to the escape of argon from the housing interior 9 and the entry of air and moisture from the external environment into the housing interior 9, so that an extremely high long-term sealing of the module housing 8 is obtained becomes.
- each Sekundäroptikelement has a on the inside 63 of the cover plate 60 integrally formed light guide 80, which is associated with an integrally formed, coextensive, curvature 112 on the outer side 64 of the cover plate 60;
- Each individual LED 44 on the circuit board 40 is assigned its own light-conducting element 80, which serves to modify the light distribution pattern of the LED light emitted by the LED.
- Each light guide element 80 forms an additional flat planar, approximately parallelepipedal layer body 81 having a length of about 25 mm, a width of about 20 mm and a thickness of about 3 mm to about 4 mm, and which fits integrally on the cover plate material.
- “about” is meant here and elsewhere a 10% smaller to 10% greater range of the specified value; a width of about 20 mm thus includes widths of 18.0 to 22.0 mm.
- Fig. 6a is a plan view of a single light guide 80 in the scale 1: 4 shown enlarged.
- the approximately parallelepiped layer body 81 considered here has two longer parallel planar sides 82 and 82 'and two shorter sides 83 and 83'.
- Each laminate 81 is attached to and aligned with the cover plate 60 so that its long-side direction is aligned parallel to the cover plate transverse direction.
- the laminated body 81 has a flat surface 84, which is aligned parallel to and at a distance from the cover plate plane and which rests on the board 40 on the assembled module housing 8.
- each quarter-circle-shaped recesses 85 are formed on the laminate 81; in the case of adjacent and adjoining light-conducting elements 80 (see Fig. 6d) form each four recesses 85 together a round bore 85 'through which a screw can be performed, with which the cover plate 60 can be fixed to the metal housing plate 10.
- a recessed triangular recess 86 or 88 is recessed, which is bounded by straight surfaces 86' and 86 "or 88 'and 88"; these recesses 86 and 88 have no optical function and merely serve to save material.
- first cavity 90 and two second cavities 100 and 106 are formed; Each cavity 90, 100 and 106 is open to the laminate surface 84.
- the centrally arranged in the laminated body 81 first cavity 90 has a bell-shaped inner contour 91 with a spherical and concave curved relative to the Abdeckplattenebene rising bottom contour 92 against a flat base 93, forms the focus 95 of the light guide 80 and serves to receive an LED 44.
- the larger second Cavity 100 is bounded, in addition to a flat base surface 101, by a contour 103 which is strongly convexly curved with respect to the focus 95 and is inclined relative to the cover plate plane, the vertex 104 of which is directed towards the focus 95.
- the smaller second cavity 106 is bounded by a flat base surface 107 of a, with respect to the focus 95 moderately convex and inclined relative to the Abdeckplattenebene contour 108 whose apex 109 is directed to the focus 95 to.
- FIG. 6b schematically shows a section along the section line AA through the light-guiding element 80 shown in FIG. 6a.
- a single light-guiding element 80 is arranged in isolation on the inside 62 of the cover plate 60.
- 4d shows a schematic, limited sectional illustration of a single light-guiding element 80, whose layered body 81 is integrally formed on the inside of the cover plate 60, which is shown only as an excerpt.
- This light-guiding element 80 is assigned a coextensive curvature 112 integrally formed on the cover plate outer side 64. This curvature 112 is limited in the cover plate transverse direction of a moderately concave curved contour 113 and extends the same contour in the cover plate longitudinal direction.
- This contour 113 has a vertex 114, which occupies a distance of 3.5 mm to the other flat cover plate surface in the example considered here.
- the LED light beams having passed the cover plate 60 are deflected toward the longitudinal center of the road surface to be illuminated.
- Each individual LED 44 located on the board 40 is associated with at least one secondary optical element of the type described above.
- Several secondary optic elements of this type may be formed isolated and spaced from each other on the cover plate 60.
- an arrangement may also be chosen in which adjacent light guide elements 80 contact each other; with Fig. 6c, such an arrangement of four light-guiding elements is shown.
- a row-shaped arrangement of a plurality of contacting secondary optical elements has on the cover plate outer side 64 a common curvature 112 which extends continuously in the cover plate longitudinal direction. Furthermore, it is possible, regardless of the number of LEDs 44 on the circuit board 40, to occupy a surface area identical to the board surface on the cover plate 60 completely contacting with itself secondary optical elements of the type described above. The number of secondary optical elements on a cover plate 60 may be greater than the number of LEDs 44 on the associated circuit board 40.
- Such a cover plate can be manufactured relatively inexpensively by injection molding and can then be used in different module housings having a different arrangement of the LEDs provide the board.
- FIG. 6d The oblique view of Figure 6d shows the inside 63 of a cover plate 60, on which a whole number, for example, 30, adjacent light-guiding elements 80 is integrally formed; in this illustration, only three light-guiding elements 80 are bounded by dashed lines and made identifiable as such; Each light-guiding element 80 corresponds to the illustration according to FIG. 6a.
- the total number of optical fibers 80 is arranged in six rows and five rows; these rows are aligned parallel to the longer sides 61, 61 'of the cover plate 60 (cover plate longitudinal direction).
- FIG. 7 shows an oblique view of a luminaire module 5 according to the invention.
- cover plate outer side 64 On the cover plate outer side 64, five parallel, continuous, adjacent and touching bulges 112 can be seen; each camber 112 extends coextensive with a series of light-guiding elements 80, which - as shown in FIG. 6d - on the inside 63 of the cover plate 60 are formed.
- an alternative cover plate 160 is shown having a cover plate longitudinal direction 161 and a cover plate transverse direction 162 orthogonal thereto; in the peripheral region of this cover plate 160, the above-described continuous circumferential three-groove sealing zone 70 is formed.
- alternative cover plate 160 corresponds to cover plate 60 described above.
- Cover plate 160 is formed in seven rows extending in cover plate transverse direction 162 and in five rows extending in cover plate longitudinal direction 161 , a total of 35 alternative light-guiding elements 180 are formed.
- This cover plate 160 is intended for a mid-sized street lamp equipped with a 17 x 19 cm rectangular board with 35 LED's on it, with each LED spaced at least 1.5 cm from the nearest adjacent LED.
- a single light guiding element 180 is marked in dashed lines in the upper left corner of the cover plate 160.
- Each light guide element 180 has a light guide element body 181 which forms an integral part of the cover plate 160.
- all seven light guide elements 180 form a homogeneous body without parting line (s); between each two adjacent Lichtleitelement-rows a production-related separation or limitation is recognizable.
- the entire alternative cover plate 160 is typically made of high quality PMMA by injection molding.
- FIG. 16b shows a plan view of a single insulated light guide element 180 in a scale of 1: 4, with an arrow B each pointing to a transverse side surface 183 of the light guide element 180 and a further arrow C pointing to the longitudinal side surface 184 of the light guide element 180; each a plan view of these side surfaces 183 and 184 - in the above scale 1: 4 - is shown with Figs. 16d and 16e.
- the light guide 180 is made of a transparent material, structures and boundaries of the light guide are also shown in these plan views Recognize 180 trained cavities.
- FIG. 16c shows the sectional image obtainable in a section along the section line A - A 'in FIG. 16b.
- FIG. 16f light distributions achievable with an LED luminaire module equipped with an alternative cover plate 160 will be explained.
- the single insulated light guide 180 forms a flat body 181 with a flat rectangular base 182, which has a side length of about 20 mm in the longitudinal side direction and a side length of about 25 mm in the lateral direction.
- a side length of about 20 mm thus includes side lengths of 18.0 to 22.0 mm.
- the side surfaces 183 and 184 have a height of about 8 mm.
- the light-guiding element 180 has a slightly contoured cover surface 185 above this height; in cross-section follows this contour of a flat double shaft with central valley 186, which extends in the longitudinal direction.
- each individual Lichtleitleitelement 180 here consists of corrochigem, transparent polymethylmethacrylate (PMMA) with a refractive index of 1, 49th
- PMMA transparent polymethylmethacrylate
- three cavities are formed, namely, a first cavity 190 and two second cavities 194 and 200 are formed, which are all open to the base 182 out.
- the first cavity 190 which is arranged centrally in the light-conducting element body 181, forms the focus of the light-guiding element 180 and serves to receive an LED 44, which dips into this cavity 190.
- the base surface 182 rests on the circuit board 40, and the light-generating LED semiconductor chip is located within the light-guiding element body 181 in its first cavity 190.
- the light guide 180 which is referred to in the relevant art as lens, has only a small height of about 9 to 10 mm, which is why the invention, the so-called "flat-lens design" (flat-lens design) is realized.
- the horizontal LED light component emerging parallel or nearly parallel and close to the base 182 accounts for about 10% of the total LED light and would be absorbed by the lamp module housing.
- the light guiding element provided special cavities, at their interfaces a total reflection of the horizontal LED light can take place, so that this proportion of light from the horizontal direction is forced back into the functional direction.
- the second cavities 194 and 200 form such
- the first cavity 190 formed within the light guide body 181 is bounded by
- a large planar pitch surface 191 which covers an angular range of approximately 120 ° on a circle having a radius of curvature of approximately 20 mm and which is oriented perpendicular to the base surface 182;
- a small planar pitch circle 192 which covers an angle range of about 120 ° on a circle with a radius of curvature of about 10 mm, and which is parallel to the large pitch surface 191 and directed at a distance of about 5 mm to this;
- a second cavity is formed within the light guide element body 181, which is referred to herein as a large recessing cavity 194; Furthermore, another second cavity, referred to herein as the smaller-returning cavity 200, is formed adjacent to the large pitch circle 191 within the light-guiding body 181
- the large rectifying cavity 194 is limited
- pitch circle surface 195 which covers an angle range of about 130 ° on a circle with a radius of curvature of about 9 mm, and which is arranged parallel and spaced from the large pitch surface 193;
- the small rectifying cavity 200 is limited
- a pitch circle surface 201 which covers an angular range of approximately 130 ° on a circle having a radius of curvature of approximately 9 mm and which is arranged parallel to and at a distance from the large pitch surface 191;
- the distance between the pitch circle 201 on a light guide 180 to the adjacent pitch circle 195 on the adjacent light guide 180 is about 3 mm.
- Each light guide element 180 and the cavities 190, 194 and 200 formed therein are formed symmetrically to a longitudinal center plane which is aligned with the section line A - A 'in alignment parallel to the longitudinal side direction.
- each conical tip 197 and 202 is located on the base 182
- the adjacent proportional conical surface 196 and 201 increases obliquely in the longitudinal side direction until it has reached the pitch circle circumference at the respective pitch circle 195 or 201.
- a total reflection of LED light can take place, which strikes these conical surface areas on its way through the light-conducting material.
- the LED light strikes the conical surface at an angle of incidence, forming an interface between air and PMMA or PC.
- PMMA has a refractive index of 1.49
- PC has a refractive index of 1.855.
- material-specific critical angle which for PMMA is 42.17 ° and for PC 39, 13 °. If the angle of incidence, under which the LED light AIF meets the conical surface, is greater than this critical angle, then a total reflection of the incident LED light takes place on the conical surface. The LED light thus reflected will finally exit the light guide element 180 at the light guide element cover surface 185.
- parallel or substantially parallel LED light which is also referred to as “horizontal LED scattered light”
- horizontal LED scattered light can be directed back and forced in a direction in which it emerges from the LED luminaire module 5 and used for illumination purposes can.
- the overall height of the LED light module 5 is small as possible, including the flanges at the back typically less than 30 mm, and less than 25 mm in the case of the medium-sized street lamp considered here.
- the proportion of horizontal LED light accounts for up to 10% of the total LED light.
- the inventively provided rectifying cavities 194 and 200 within the alternative light-guiding element 180 up to 70% of this horizontal LED scattered light can be redirected, thus saved and additionally used for street lighting.
- the luminous efficacy of an LED luminaire module according to the invention can be increased by up to 7%.
- An alternative LED lighting module 5 ' may be provided with an alternative cover plate 160 having a lamp module longitudinal direction and a lamp module transverse direction orthogonal thereto, and on which in seven rows and five rows a total of 35 alternative light guide elements 180 described above are formed; and
- a luminaire for street lighting equipped with such an alternative LED luminaire module 5 ' is typically arranged such that the longitudinal direction of the light guide element, the cover plate longitudinal direction and thus also the longitudinal direction of the luminaire module are aligned perpendicular to the direction of travel of the street to be illuminated.
- the light guide 180 is made of PMMA, with a refractive index of 1.49; the surfaces of the cavities 190, 194 and 200 are finely machined and have high smoothness (rough surfaces would scatter the light in different directions). At the bordering cavities 194 and 200 limiting
- Cone surface areas 196 and 202 a total reflection of LED light take place, which meets on its way through the light guide material on this conical surface when its angle of incidence is greater than the critical angle 42.17 °.
- an LED luminaire module which contains 24 LEDs, (light wattage 72 W), each associated with an alternative light-conducting element 180, which provides a light flux of about 8750 Im and which is attached to a street lamp, which in turn is attached to a whip mast at a height of 10 m above the roadway.
- the purpose of this street lamp is to illuminate a typical street with a lane width of 6 m (two directions of travel), followed by a 2.5 m wide parking zone and a 2.4 m wide footpath.
- the illuminance is determined on a circular flat surface at a number of measuring points, which are designated by their polar coordinates.
- the results thus obtained are shown in FIG. 16f. shown; the area obtained for the plane C0 - C180 is shown by a solid line; the area obtained for the plane C90 - C270 is shown with a dashed line.
- the respective bounded areas are a measure of the luminances obtained in the respective direction. Obviously, a very different luminance distribution is obtained, which is adapted to the respective needs; the road is on one long area sufficiently and evenly lit, so that a distance of 40 m between two whip masts, each with a street lamp is possible.
- the values of illuminance required by DIN EN 13 201 for different areas are also met:
- Parking zone 1 length 40 m, width 2.5 m, selected illumination class CE5, measured on a grid with 14 x 3 measuring points average luminance Eav (Ix) U0
- Footpath 1 length 40 m, width 2.4 m, selected lighting class S5, measured on a grid with 14 x 6 measuring points:
- a hermetically sealed adhesive bond with an adhesive is produced in which both during the reaction of the two adhesive components as later in the cured state, the risk of release, outgassing or evaporation of non-compatible volatile, organic Compounds, so-called VOCs, minimal is.
- VOCs volatile, organic Compounds
- the commonly used simple 1-K cyanoacrylate adhesives, such as "superglue”, are less suitable here.
- a selected 2-component acrylate adhesive which cures at room temperature is used, in which case this risk is minimal.
- the hermetically sealed adhesive bond between cover plate 60 and metal housing plate 10 is produced in particular and particularly preferably with the aid of a 2-component acrylate adhesive based on methyl methacrylate, which is cured by peroxide-induced radical polycondensation.
- Peroxide-induced radical polycondensation provides a fully reacted, cured product that does not release volatile organic compounds or components (VOCs).
- VOCs volatile organic compounds or components
- one part by volume peroxide B component is used per ten parts by weight of methacrylic acid A component.
- the adhesive is ready for use.
- the mixing and application can be carried out at room temperature (about 25 ° C).
- the mixing and application can be carried out by means of a transportable applicator comprising:
- the prepared adhesive mixture is introduced into the center groove 74 of the three-groove sealing zone 70 on the cover plate 60.
- the adhesive mixture adheres to the groove surfaces.
- Cover plate 60 is immediately placed on the metal housing plate 10 so that its three-flange sealing contour 30 penetrates into the three-groove sealing zone 70 on the cover plate 60. Subsequently, a considerable pressure force, for example up to 100 N, can be exerted on the cover plate 60 when the housing plate 10 is held in place in order to achieve its final arrangement on the housing plate 10.
- An amount of 2-component acrylate adhesive is introduced into the center groove 74 to allow the introduced adhesive mixture to form a continuous adhesive strand 77 ranging from a first level of adhesive bead 78 in the outer groove 72 to a second level of adhesive bead 79 in the inner groove 76.
- a leak test is carried out on the LED lighting module 5 which has been completed so far.
- a first round post 52 and a second round post 55 are integrally formed on the plate bottom 22 of the metal housing plate 10, each associated with a corresponding counterpart 53 and 56 on the back 16 of the housing plate 10; through each post 52 and 55, as well as through the respective counterpart 53 and 56 and through the plate portion therebetween is guided in each case one, provided with an internally threaded bore 54 and 57, respectively.
- an air pressure gauge is connected to the one hole 54.
- a mammalian pump is connected, with which the air pressure in the interior 9 of the module housing 8 is lowered to a value of 100 millibar (mbar) or less.
- the LED lighting module 5 is heated to an elevated temperature prior to this vacuum treatment, for example, to about 50 to 80 ° C, and the pressurization is continuously performed for at least 20 minutes at this elevated temperature.
- This particular vacuum treatment even stubborn adhering VOCs can be largely removed from the interior 9 of the module housing 8.
- the connection to the mammal pump is interrupted, and this hole is sealed pressure-tight. Subsequently, with the aid of the air pressure measuring device connected to the other bore 57, it is checked whether the negative pressure set in the interior 9 remains constant for at least 30 seconds.
- the lamp module interior 9 is filled with argon (Ar).
- Ar is used which has a purity greater than 99.99%, for example a purity of 99.996%.
- Ar can be provided from commercial gas cylinders. Suitable Ar compressed gas cylinders can be obtained, for example, from KRAISS & FRIZ, 70190 Stuttgart, Germany.
- a gas pressure reducing valve downstream probe is connected to the one bore 54 to introduce Ar into the lamp module interior space 9.
- a gas analyzer is connected, which analyzes the composition of the emerging from the lamp module interior 9 gas.
- the function of the electronics and the light generation caused by the LEDs as well as the desired light propagation are checked. If the tested LED luminaire module fulfills all specified requirements, a test certificate with article number and test date is output and attached to the tested LED luminaire module.
- each module housing I, II and III a holder is attached to the Plattenboden- of the metal housing plate holding two electrodes so that after applying a DC voltage between 2 and 5 kV between the electrodes, an arc ignites and can be operated. Voltage and current are supplied via a multi-core cable, which is sealed with respect to the housing by means of a conventional conical sealing compression fitting.
- the sensor of a spectrometer can be mounted on its transparent ceiling plate, which after ignition of the arc in the respective Gas recorded radiation evaluates and evaluates and prints out an appropriate Speu rum and stores.
- Spectrometer USP-G which has a measuring range of 200 to 1200 nm
- the interior of the module housings I and II is filled with 100% Ar
- the interior of the module housing III is filled with different gas compositions for calibration purposes and comparative spectra are generated, in detail the following gas compositions are measured: 100% Ar, 90% Ar + 10% air, 80% Ar + 20% air to 10% Ar and 90% air and 100% air
- the spectra obtained for the gas compositions are 100% Ar, 70% Ar + 30% air, 50% Ar + 50% air, 30% Ar + 70% air and 100% air
- the actual test started in January 2017 and was completed in November 2017.
- the module housing I filled with 100% Ar is kept constant at 25 ° C and under ambient air pressure At least once a week the arc is ignited and a spectrum of the current gas composition is manufactured and stored. This is considered a reference treatment for normal aging under ambient conditions.
- a drying oven in which a closable pressure chamber is set up.
- the module housing II filled with 100% Ar is placed in this pressure chamber and kept therein at 23 ° C at 50 ° C. and under an air pressure which is reduced by 100 mbar (millibars) from the ambient air pressure.
- the pressure chamber is opened, the module housing II is exposed to the ambient air pressure, the arc is ignited, and a spectrum of the current gas composition is manufactured and stored. This type of treatment is considered as accelerated aging treatment.
- the gas composition produced in the module housing II becomes a spectrum which agrees with the spectrum obtained from the gas composition in the module housing I after expiration of 23 weeks of normal aging under ambient conditions. It is concluded that accelerated aging treatment has an "acceleration factor" of 23 under the conditions imposed here. Consequently, after 46 weeks of accelerated aging treatment, the gas mixture formed in module housing II should have a composition which, after normal aging under ambient conditions, is not obtained until 1058 weeks have elapsed; that is a period of 20.7 years. A comparison with a comparative spectrum confirms that the gas composition formed after expiration of 46 weeks of accelerated aging treatment in the module housing II still contains at least 58% of the originally charged argon (Ar). Fig. 9 shows some spectra obtained from the gas composition formed in the module housing II at certain indicated periods of accelerated aging treatment.
- the above experiment confirms the expectation that in the module housing of an LED luminaire module according to the invention, the white light-generating LEDs provided therein can be operated under a protective atmosphere for a lifetime of at least 20 years.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018004049.7A DE102018004049B4 (de) | 2018-05-18 | 2018-05-18 | Led-leuchtenmodul und verfahren zu dessen herstellung |
| PCT/EP2019/000157 WO2019219240A1 (de) | 2018-05-18 | 2019-05-17 | Led-leuchtenmodul und verfahren zu dessen herstellung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3794276A1 true EP3794276A1 (de) | 2021-03-24 |
| EP3794276B1 EP3794276B1 (de) | 2022-07-20 |
Family
ID=66770416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19728578.6A Active EP3794276B1 (de) | 2018-05-18 | 2019-05-17 | Led-leuchtenmodul und verfahren zu dessen herstellung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3794276B1 (de) |
| DE (1) | DE102018004049B4 (de) |
| WO (1) | WO2019219240A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215831708U (zh) | 2021-04-30 | 2022-02-15 | 伊顿智能动力有限公司 | 用于严苛和危险环境的led照明组件的led模块 |
| EP4720566A1 (de) | 2023-05-25 | 2026-04-08 | Signify Holding B.V. | Leuchte mit flexiblem gehäuse |
| DE102024113458A1 (de) * | 2024-05-14 | 2025-11-20 | HELLA GmbH & Co. KGaA | Verbindungsanordnung einer Abschlussscheibe an einem Gehäuse, Beleuchtungsvorrichtung für ein Kraftfahrzeug, und Verfahren zum Wechsel einer Abschlussscheibe |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004158495A (ja) | 2002-11-01 | 2004-06-03 | Toshiba Lighting & Technology Corp | 発光ダイオードおよび照明装置 |
| DE102008058757A1 (de) | 2008-11-19 | 2010-05-20 | M I P Center Gmbh | Leuchteinrichtung für Beleuchtungszwecke und Leuchte mit einer solchen Leuchteinrichtung |
| JP5430470B2 (ja) | 2010-03-31 | 2014-02-26 | 株式会社半導体エネルギー研究所 | 発光装置、及びその作製方法 |
| US9188323B2 (en) * | 2010-10-20 | 2015-11-17 | Semiconductor Energy Laboratory Co., Ltd. | Lighting device |
| US8628217B2 (en) | 2011-11-12 | 2014-01-14 | Bridgelux, Inc. | Low profile heat sink with attached LED light source |
| KR20140076390A (ko) * | 2012-12-12 | 2014-06-20 | (주) 굿피앤씨 | 엘이디 집어등 |
| US20140192521A1 (en) | 2013-01-10 | 2014-07-10 | Ledil Oy | Light guide element |
| US10443820B2 (en) | 2014-12-09 | 2019-10-15 | Current Lighting Solutions, Llc | Plastic LED fixture housing with outer frame |
| US10054285B2 (en) * | 2016-06-24 | 2018-08-21 | Cree, Inc. | Light fixture and optic with light-transmissive shield |
| DE102017000571B3 (de) | 2017-01-23 | 2018-06-28 | Robert Virant | Led-leuchtenmodul und verfahren zu dessen herstellung |
-
2018
- 2018-05-18 DE DE102018004049.7A patent/DE102018004049B4/de active Active
-
2019
- 2019-05-17 WO PCT/EP2019/000157 patent/WO2019219240A1/de not_active Ceased
- 2019-05-17 EP EP19728578.6A patent/EP3794276B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018004049A1 (de) | 2019-11-21 |
| EP3794276B1 (de) | 2022-07-20 |
| DE102018004049B4 (de) | 2021-08-12 |
| WO2019219240A1 (de) | 2019-11-21 |
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