EP2521876B1 - Led-lighting device and method for producing an led lighting device - Google Patents

Led-lighting device and method for producing an led lighting device Download PDF

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Publication number
EP2521876B1
EP2521876B1 EP11741532.3A EP11741532A EP2521876B1 EP 2521876 B1 EP2521876 B1 EP 2521876B1 EP 11741532 A EP11741532 A EP 11741532A EP 2521876 B1 EP2521876 B1 EP 2521876B1
Authority
EP
European Patent Office
Prior art keywords
led
cover
lighting device
support
carrier
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.)
Not-in-force
Application number
EP11741532.3A
Other languages
German (de)
French (fr)
Other versions
EP2521876A1 (en
Inventor
Harald Dellian
Thomas Preuschl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
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Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2521876A1 publication Critical patent/EP2521876A1/en
Application granted granted Critical
Publication of EP2521876B1 publication Critical patent/EP2521876B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • F21K9/27—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
    • 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
    • F21K9/90—Methods of manufacture
    • 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
    • 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
    • F21V3/10—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings
    • 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
    • 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
    • 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 an LED lighting device, in particular LED tube lamp.
  • the invention further relates to methods for producing an LED lighting device.
  • LED tube lamps lamps with a tubular outer contour, which typically have a plurality of light-emitting diodes (LEDs) as their light sources
  • a space is very limited. Due to the required electronics (driver) for driving the LEDs, the lateral distance between a support for placing an LED carrier fitted with the LEDs and the LEDs is also critical.
  • an optics for light distribution, in particular light scattering, is required in order to avoid an inhomogeneous light distribution, which is caused by the use of the LEDs as point light sources.
  • the WO 2009/119038 A2 shows a lighting device according to the preamble of claim 1.
  • an LED lighting device comprising an LED support, which is equipped at its front with at least one LED and is fixed with its back to a support, wherein the front of the LED support is over-arched by an electrically insulating, translucent and diffusely diffusing cover (the "LED cover”) and the LED cover is arched over by a protective cover sitting on the support, wherein the LED cover is formed of a body, which is also an intermediate layer between the back of the LED support and the support (which may also be designed as a heat sink) forms.
  • the LED cover may also be used or formed as an intermediate layer between the back of the LED carrier and the overlay.
  • the LED cover thus serves both as an electrical insulation or cover (additional cover) and as an optical element for light distribution.
  • Such an LED lighting device fulfills a variety of electrical standards, in particular for operating the LEDs in a non-SELV configuration (the at least partially translucent protective cover can also serve as an electrical base cover and consist of an electrically insulating material). a configuration in which at least the LEDs are operated with a voltage which is higher than a safety extra-low voltage). Since the material of the LED cover is electrically insulating, it reaches as an intermediate layer an additional electrical insulation of the LED support against the support. Due to the one-piece design further components can be saved, and it is an even easier installation possible.
  • the protective cover may be transparent or diffused.
  • the design as a diffuser enhances a homogenization of the incident light.
  • the LED cover is preferably good heat-conducting through its thickness to a thermal contact resistance low and to keep heat dissipation from the LEDs to the heat sink high. This can be achieved in that the material in bulk form has good thermal conductivity and / or has a correspondingly small thickness (is thin).
  • the LED cover (or the body forming the LED cover with the intermediate layer) may be in the form of a rolled-up flexible sheet.
  • a body can be understood to mean a body whose extent in a plane is far greater than its thickness.
  • a particularly thin sheet may also be referred to as a film.
  • the rolled-up sheet may in particular have a hollow cylindrical basic shape, for example with a circular cross-sectional profile, an oval cross-sectional profile, a polygonal cross-sectional profile, a freeform-like cross-sectional profile, etc.
  • the rolled-up sheet abuts one another at an abutting area (flat or linear) and forms one along its longitudinal axis, around which the sheet is rolled, around the longitudinal axis of the circumferentially closed body.
  • an abutting area flat or linear
  • the LED support may be circumferentially surrounded by the electrically insulating, flexible body. This increases electrical protection.
  • the rolled up form which e.g. can be reached by a suitable bending of the sheet, simplifies assembly.
  • the rolled-up LED cover can press against each other at the butt portion without being firmly joined together. It is advantageous for preventing inadvertent release of the abutting portion that the rolled-up LED cover is fixedly connected at its abutting portion.
  • the welding has the advantage that it causes a hot deformation of the material of the LED cover in the joint area, which causes a solid connection by standards. As a result, an encapsulated unit is formed which reduces a number of possible clearance and creepage distances.
  • the support has at least one mounting recess for receiving a portion of the LED cover.
  • the mounting recess may be e.g. comprise at least one groove in the support, in which the material of the LED cover can be inserted and / or clamped.
  • the LED cover may be in the form of a rolled-up sheet which projects at least partially beyond its abutting area on its outer side and is press-fitted with at least part of the free edge of the projecting region into a longitudinal groove in the support.
  • the LED cover may thus be inserted into the support in particular by means of only one edge or at least one latching projection.
  • the free edge may be shaped to fit straight or textured, e.g. be provided with defined projections.
  • Another mechanical fixation is achieved by the contact pressure of the LED carrier, which in turn is e.g. through hold-downs, plastic rivets, mechanical fasteners, etc.
  • the LED cover can in particular have a non-closed contour or shape and, for example, together with the support form a cavity (possibly open at the end) for the populated LED carrier.
  • the LED cover can then be fastened to the support in particular with at least part of its free edges.
  • the LED cover can, for example, be slipped over the LED carrier be.
  • the LED cover can be inserted, for example, with opposing free edges in two parallel grooves of the support.
  • the LED cover can in particular have an at least approximately half hollow cylindrical cross-sectional shape.
  • the width of the LED cover also determines their curvature.
  • the LED cover can be flexible or substantially rigid (only slightly flexible and / or self-supporting). Particularly in the case of the substantially rigid embodiment, a rotationally symmetrical shape is also possible, for example a spherical segment-shaped LED cover.
  • the LED cover can generally be made of a plastic.
  • the LED cover may further be provided with opaque aperture areas to selectively shape a shape of emergent light rays.
  • an exit angle of the light (aperture) can be influenced. This can e.g. be advantageous in special lamps for reading, playing music, etc.
  • the aperture areas can be formed for example by a metallization or another reflective layer of the LED cover.
  • the conductor track cover made of glass or a glassy material.
  • the glass (or glassy material) can be applied, for example, by means of a (glass) printing process and then, for example, baked in the LED carrier.
  • a high temperature resistant base material of the LED support is preferred, in particular a ceramic, for example alumina or aluminum nitride.
  • the conductor track cover covers substantially the entire front of the LED carrier outside the LEDs. This extends creepage distances particularly reliably.
  • a thermally conductive heat-conducting material in particular TIM ("Thermal Interface Material", for example a thermal paste or heat-conducting adhesive), in particular a thermal adhesive, is present between the rear side of the LED carrier and the support.
  • TIM Thermal Interface Material
  • heat dissipation from the LEDs to the support can be made particularly effective.
  • the LED carrier is connected via the thermally conductive varnishleitmaterial directly to the support.
  • the LED cover can be used, for example, in a recess in the support, in which also the LED support is received.
  • the cover may use the boundary as a stop for its accurate positioning.
  • the pad may have a dedicated mounting recess, e.g. Longitudinal grooves for inserting the LED cover, have.
  • the LED cover can be clamped or glued therein, e.g. by means of a glue dispensing.
  • the LED carrier has a base body made of an electrically insulating ceramic (eg aluminum oxide, aluminum nitride, etc.). Ceramic generally has high dielectric strength.
  • the use of an LED carrier with a ceramic base body allows operation of the LEDs with a higher than a low voltage or Protection voltage ("Non-SELV" control).
  • the LED carrier may, for example, have a main body of a printed circuit board base material, eg FR4 (particularly inexpensive) or a metal core board (particularly good heat spreading).
  • the support has at least one recess with a stepped edge for insertion of the LED carrier and the LED cover.
  • This can facilitate positioning of the LED cover.
  • the stepped edge or step in particular in the case of an LED cover in the form of a rolled sheet, can specifically influence its shape, e.g. force a bend in one area of the step.
  • the LED lighting device is a LED tube retrofit lamp.
  • An LED tube retrofit lamp is intended to replace a tubular lamp, e.g. a fluorescent tube, a line lamp, etc. It is advantageous if the support is a heat sink.
  • the LED carrier and the LED cover are then preferably of elongated shape.
  • the LED carrier band-shaped, the cover cylindrical or cylindrical section and / or the support cylindrical section, in particular semi-cylindrical be configured.
  • the LED lighting device is not limited to a configuration as a tube lamp.
  • the underlying portion of the LED cover is pressed in particular on the support and thereby fixed.
  • the application of the LED cover and placing the LED support is preferably done so that on one side of the LED support a comparatively wide portion of the LED cover to flip over the LED support and on the other side of the LED support a comparatively narrow portion of the LED cover protrudes to make the abutting portion (or contact portion).
  • the attachment of the folded portion may be e.g. be achieved by plugging the LED cover in a mounting recess of the support or by connecting the LED cover to the joint area.
  • the arrangement of the LED cover can be achieved, in particular, by inserting the LED cover into a recess of the support with a step-shaped edge, which also serves to receive the LED support.
  • the rim can then serve as a side stop for the LED cover to accurately position it.
  • the attachment of the LED carrier to the thermal interface material may generally be by means of the thermal interface material, e.g. if the thermal interface material also serves as an adhesive, or by other means, e.g. Screws or downholders, e.g. if the heat conduction material itself does not serve the attachment, for example, in an embodiment as a heat conduction pad ("TIM pad”) or heat conduction.
  • TIM pad heat conduction pad
  • the fixing of the LED cover can be carried out in particular on the support, in particular by means of an adhesive bead.
  • Fig.1 shows an LED tube lamp 1, which is particularly useful as a retrofit lamp for conventional tube lamps such as a fluorescent tube, a line lamp, etc.
  • the LED tube lamp 1 has a substantially cylindrical or tubular basic shape whose longitudinal axis is perpendicular to the image plane in the illustration shown. At the ends of the LED tube lamp 1 cover caps for mechanical and / or electrical connection of the lamp with a corresponding version of a lamp can be (o.Fig.).
  • the LED tube lamp 1 has in its lower half, namely the cross-section approximately semicircular filling, a support in the form of a heat sink 2.
  • the heat sink 2 may have, for example, cooling fins.
  • An upper side 3 of the heat sink 2, which is directed upward in this illustration, has a cross-sectionally rectangular recess 4 in its center, that is to say that the recess 4 runs in a straight line in a plane perpendicular to the image plane.
  • an LED carrier 5 Inserted into the recess 4 is an LED carrier 5, which is equipped or occupied on its upper side or front side 6 with a plurality of light-emitting diodes (LEDs) 7 and printed conductors 8.
  • the light-emitting diodes 7 are preferably arranged equidistantly in a row in the longitudinal direction of the LED tube lamp 1.
  • the interconnects 8 connect, for example, the LEDs 7 together and with an electronic control.
  • the conductor tracks 8 are covered by a conductor track cover 9 made of glass or a glassy material, so that a creepage distance K to the LEDs 7 at least up to a lateral edge of the conductor track cover 9, indicated here by the distance K, extends.
  • the LED carrier 6 On its rear side 10, the LED carrier 6 rests on a layer of a thermal adhesive 11 on a bottom of the recess 4.
  • the populated LED carrier 5 is arched over its entire length by an LED cover 12, which also in the Recess 4 is seated, in such a way that it presses laterally against a stepped edge 13 of the recess 4, so that the stepped edge 13 simultaneously represents a lateral stop for the LED cover 12.
  • the LED cover 12 consists of an electrically insulating, transparent and diffusely scattering material, so that the LED cover 12 simultaneously serves as electrical insulation and as an optical diffuser.
  • the inner side facing the LED carrier 5 may be partially covered by an opaque aperture layer 14, e.g. a metallization, so that light from the LEDs only passes through a released from the aperture layer 14 window 15.
  • the LED cover 12 may be made of plastic, realized here for example in the form of a semicircular cylindrical plastic body, wherein the LED cover 12 is here preferably self-supporting and only slightly elastically bendable. Due to the elastic bendability of the LED cover 12, this can be pressed in laterally on both sides and then inserted into the recess 4, wherein after completion of the two-sided introduction of force, the LED cover 12 spring back again laterally and are held by a press fit in the recess 4 can.
  • Adhesive 17 applied, eg by dispensing a first liquid and then curing adhesive.
  • the upper side 3 of the heat sink 2 is overarched as a whole by a (transparent or diffusely scattering) protective cover 16.
  • the protective cover 16 has a substantially semicircular cylindrical cross-sectional shape and sets with respect to an outer contour flush with the heat sink 2 at.
  • the outer contour of the heat sink 2 and the outer contour of the protective cover 16 together form at least substantially a cylindrical surface.
  • the protective cover 16 may for example be glued to the heat sink 2 and, for example, in edge-side longitudinal grooves (o.Fig.) Of the heat sink 2, which serve as a mounting recess, inserted.
  • the protective cover 16 is also made of an electrically insulating material and causes the LED carrier 5 is double-protected with the LEDs 7 and printed conductors 8 located on its upper side together with the LED cover 12. As a result, especially electrically critical air gaps can be avoided.
  • the LED tube lamp 1 can be produced inter alia by first dispensing the thermal adhesive 11 in the recess 4. Then the populated LED carrier 5 is pressed with its back 10 on the sautkleber 11, and it is waited until the sauitkleber 11 is cured, so that the LED support 5 securely adheres to the heat sink 2. In a following step, the LED cover 12 is inserted into the recess 4 and then glued by the adhesive bead 17 with the heat sink 2. Then, the protective cover 16 can be placed on the heat sink and fastened there. In yet another step, the still open ends of the hitherto resulting LED tube lamp 1 can be provided with corresponding caps for mechanical and / or electrical contact.
  • the LEDs 7 emit light through the window 15, wherein an approximately point-shaped light distribution at the location of the LEDs 7 is homogenized by the diffusely scattering property of the LED cover 12.
  • the light beam exiting through the window 15 continues to pass through the protective cover 16, the protective cover 16, although it also has a beam-forming property, for example by lens regions integrated therein, shape the light beam passing through it again, for example, focus or widen.
  • the waste heat generated by the LEDs 7 is transmitted to the heat sink 2 by the LED carrier 5 and the thermal adhesive 11. Due to the fact that the heat-conducting adhesive 11 has a low thermal resistance and, moreover, can be applied very thinly, the heat from the LED carrier 5 can be transmitted to the heat sink 2 substantially unhindered.
  • the LED carrier 5 preferably has a base material made of ceramics (alumina, aluminum nitride, etc.) so that it firstly has a very good electrical insulation, a high dielectric strength, a high heat resistance, which is particularly useful when the conductor track cover 9 is made of glass is advantageous and also has a very good thermal conductivity, so that the LEDs 7 are very effective coolable.
  • ceramics alumina, aluminum nitride, etc.
  • Fig.2 shows an LED tube lamp 21 according to a second embodiment.
  • the LED cover 22 is now designed so that it serves as the intermediate layer 27 at the same time.
  • the LED cover 22 consists of an originally rectangular sheet (a body whose thickness is considerably smaller than its planar extent) made of an electrically insulating, translucent and diffusely scattering material, in particular plastic.
  • the LED cover 22 is subsequently transferred to a rolled-up state shown here in which a contact or abutting portion 23 is formed by the LED cover 22, on which two portions of the LED cover 22 collide.
  • the rolled-up state can be achieved not only by a rolling movement but also by any other bending of the blade, for example by large-scale bending along one or more bending lines.
  • the LED cover 22 has been mounted so that the sheet constituting the LED cover 22 is first placed on the heat sink so as to cover the recess 4. Then, the LED carrier 5 is inserted with its rear side 10 into the recess 4 and pressed onto the part of the LED cover 22 (which should serve as the intermediate layer 27) located in the support 2, e.g. by hold-down or other fasteners. Since the LED carrier 5 is narrower than the recess 4, a narrow portion 24 of the LED cover 22 remains exposed on one side, and on the other side, a wide portion 25 of the LED cover 22 remains free. By the stepped edge 13 of the recess 4 of the narrow portion 24 and the wide portion 25 are bent up there. The narrow portion 24 thus has an obliquely upwardly directed, preferably out of the recess 4 looking out free side edge.
  • the wide portion 25 is simply bent over the populated LED support 5 and inserted with its free edge past the free edge of the narrow portion 24 in a trained as a longitudinal groove mounting recess 26 in the surface 3 of the heat sink 2.
  • the free edge of the narrow portion 24 presses against the wide portion 25 and thus forms a the LED support 5 in the longitudinal direction of the LED tube lamp 21 enclosing, electrically insulating body.
  • the end surfaces are still open until then, but can be suitably closed, for example by contraction or compression, so that the LED cover 22 for the LED carrier 5 is a substantially (up to, for example, size negligible passages for fasteners or electrical lines) enclosed on all sides.
  • the impact area is maintained solely by the mechanical pressure of the narrow portion 24 on the wide portion 25, no post-processing on the abutment portion 23 is required.
  • the mounting recess 26 and / or the free lateral edge of the wide portion 25 may be provided prior to insertion of the free edge in the mounting recess 26 with an adhesive to prevent inadvertent release of the LED cover 22, 25 from the mounting recess 26 safely.
  • the wide section 25 of the LED cover 22 can be easily brought over the populated LED carrier 5 ( in particular in the case of a substantially elastically deforming blade, which is preferably also self-supporting), or the broad portion 25 can be plastically bent in sections along defined bending lines (in particular in the case of a plastically bending blade).
  • These mechanical properties of the LED cover 22 can be adjusted, for example, by selecting a material, in particular plastic, with suitable mechanical bulk properties and / or by selecting a layer thickness d.
  • a smaller layer thickness d for reducing a thermal contact resistance between the rear side 10 of the LED carrier 5 and the heat sink 2 may be advantageous.
  • the thickness d of the LED cover 22 is reduced only in the region which is arranged below the LED carrier with respect to the region covering the LEDs. This ensures a mechanically stable overlap of the LEDs as well as a good heat dissipation. For more effective heat removal, it is generally preferred that the material of the LED cover 22 be thermally well thermally conductive.
  • the LED cover 22 can also be equipped with an aperture layer, in particular metallization (not shown), at least in its broad section 25.
  • Figure 3 shows in one too Fig.2 analogous representation of a section of an LED tube lamp 31 according to a third embodiment, wherein the position of the section analogous to that in Fig.2 dashed circle is located.
  • the detail shows in particular a joint region 33 of an LED cover 32.
  • the LED tube lamp 31 is at least similar to the tube lamp 21 except that the narrow portion 34 and the wide portion 35 are fixedly connected to each other in the butting region 33.
  • the mounting recess 26 can be omitted.
  • the solid compound can be accomplished, for example, by a plastic laser welding process.
  • the narrow portion 34 is so narrow that it is completely in the bottom of the recess 4 of the heat sink 2, preferably so that its free edge abuts the stepped edge 13 of the recess 4, so that an accurate positioning of the free edge and so that the LED cover 32 can be carried out particularly easily.
  • the narrow portion 34 lies flat on the bottom of the recess 4, so that the free lateral edge of the wide portion 35 can also be easily placed in the recess 4 above the narrow portion 24, wherein the stepped edge 13 serves as a lateral stop ,
  • an at least line-shaped, preferably broad impact area or contact area is formed, which is easily accessible by a laser beam L for welding the two sections 34, 35.
  • This method is also particularly easy to perform and also gives the advantage that the welding process forms a standard electrically sealed connection.
  • the LED lighting device is not limited to use with LED tube lamps. Rather, differently designed LED lamps can use the described invention or be constructed therewith. Moreover, the invention is not limited to use with a lamp, but may include, for example, LED modules and LED lights.
  • the heat sink may also be a part of an LED light; this may mean, in particular, that the LEDs 7 can not be exchanged in a standardized manner, which, however, is not essential in view of the high lifetimes of the LEDs 7 Problem may be.
  • the lamp may be a table lamp, wall lamp or desk lamp, which may also have a cylindrical basic shape.
  • the invention is not intended to be elongate, e.g. cylindrical, lighting devices limited, but may also take any other form, e.g. with rotationally symmetrical covers, as long as only the double cover with the LED cover and the protective cover over the LEDs can be implemented.
  • the material of the LED cover can have, for example, PC, ABS and / or PMMA.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Description

Die Erfindung betrifft eine LED-Leuchtvorrichtung, insbesondere LED-Röhrenlampe. Die Erfindung betrifft ferner Verfahren zum Herstellen einer LED-Leuchtvorrichtung.The invention relates to an LED lighting device, in particular LED tube lamp. The invention further relates to methods for producing an LED lighting device.

In LED-Röhrenlampen (Lampen mit einer röhrenförmigen Außenkontur, welche typischerweise mehrere Leuchtdioden (LEDs) als ihre Lichtquellen aufweisen) ist ein Bauraum sehr begrenzt. Durch die erforderliche Elektronik (Treiber) zum Ansteuern der LEDs ist zudem der seitliche Abstand zwischen einer Auflage zum Auflegen eines mit den LEDs bestückten LED-Trägers und den LEDs kritisch. Zusätzlich wird noch eine Optik zur Lichtverteilung, insbesondere Lichtstreuung, benötigt, um eine inhomogene Lichtverteilung, welche durch Verwendung der LEDs als Punktlichtquellen bedingt ist, zu vermeiden. Die WO 2009/119038 A2 zeigt eine Leuchtvorrichtung gemäß dem Oberbegriff des Anspruchs 1.In LED tube lamps (lamps with a tubular outer contour, which typically have a plurality of light-emitting diodes (LEDs) as their light sources) a space is very limited. Due to the required electronics (driver) for driving the LEDs, the lateral distance between a support for placing an LED carrier fitted with the LEDs and the LEDs is also critical. In addition, an optics for light distribution, in particular light scattering, is required in order to avoid an inhomogeneous light distribution, which is caused by the use of the LEDs as point light sources. The WO 2009/119038 A2 shows a lighting device according to the preamble of claim 1.

Es ist die Aufgabe der vorliegenden Erfindung, eine LED-Leuchtvorrichtung bereitzustellen, welche zumindest einen der Nachteile des Standes der Technik zumindest abmildert und insbesondere eine LED-Leuchtvorrichtung, insbesondere eine LED-Röhrenlampe, mit einem kostengünstigeren Aufbau bereitstellt.It is the object of the present invention to provide an LED lighting device which at least mitigates at least one of the disadvantages of the prior art and in particular provides an LED lighting device, in particular an LED tube lamp, with a more cost-effective construction.

Diese Aufgabe wird gemäß den Merkmalen der unabhängigen Ansprüche gelöst. Bevorzugte Ausführungsformen sind insbesondere den abhängigen Ansprüchen entnehmbar.This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.

Die Aufgabe wird gelöst durch eine LED-Leuchtvorrichtung, aufweisend einen LED-Träger, der an seiner Vorderseite mit mindestens einer LED bestückt ist und mit seiner Rückseite an einer Auflage befestigt ist, wobei die Vorderseite des LED-Trägers von einer elektrisch isolierenden, lichtdurchlässigen und diffus streuenden Abdeckung (der "LED-Abdeckung") überwölbt ist und die LED-Abdeckung von einer auf der Auflage aufsitzenden Schutzabdeckung überwölbt ist, wobei die LED-Abdeckung aus einem Körper gebildet ist, welcher auch eine Zwischenlage zwischen der Rückseite des LED-Trägers und der Auflage (welche auch als Kühlkörper ausgebildet sein kann) bildet. In anderen Worten kann die LED-Abdeckung auch als eine Zwischenlage zwischen der Rückseite des LED-Trägers und der Auflage verwendet werden oder bilden. Die LED-Abdeckung dient somit sowohl als eine elektrische Isolierung bzw. Abdeckung (Zusatzabdeckung) als auch als ein optisches Element zur Lichtverteilung. Dadurch können Bauteile eingespart werden, was erstens den Aufwand für Herstellung und Montage senkt. Zudem wird auf der Auflage Platz geschaffen, der z.B. zur Unterbringung elektronischer Bauelemente verwendet werden kann. Eine solche LED-Leuchtvorrichtung erfüllt durch die doppelte elektrische Abdeckung (die zumindest teilweise lichtdurchlässige Schutzabdeckung kann auch als eine elektrische Basisabdeckung dienen und dazu aus einem elektrisch isolierenden Material bestehen) vielfältige elektrische Normen, insbesondere zum Betreiben der LEDs in einer Non-SELV-Konfiguration (einer Konfiguration, bei der zumindest die LEDs mit einer Spannung betrieben werden, welche höher ist als eine Sicherheitskleinspannung). Da das Material der LED-Abdeckung elektrisch isolierend ist, erreicht es als Zwischenlage eine zusätzliche elektrische Isolierung des LED-Trägers gegenüber der Auflage. Durch die einstückige Ausgestaltung können weitere Bauteile eingespart werden, und es ist eine noch einfachere Montage möglich.The object is achieved by an LED lighting device, comprising an LED support, which is equipped at its front with at least one LED and is fixed with its back to a support, wherein the front of the LED support is over-arched by an electrically insulating, translucent and diffusely diffusing cover (the "LED cover") and the LED cover is arched over by a protective cover sitting on the support, wherein the LED cover is formed of a body, which is also an intermediate layer between the back of the LED support and the support (which may also be designed as a heat sink) forms. In other words, the LED cover may also be used or formed as an intermediate layer between the back of the LED carrier and the overlay. The LED cover thus serves both as an electrical insulation or cover (additional cover) and as an optical element for light distribution. As a result, components can be saved, which firstly reduces the cost of production and assembly. In addition, space is created on the edition, which can be used, for example, to accommodate electronic components. Such an LED lighting device fulfills a variety of electrical standards, in particular for operating the LEDs in a non-SELV configuration (the at least partially translucent protective cover can also serve as an electrical base cover and consist of an electrically insulating material). a configuration in which at least the LEDs are operated with a voltage which is higher than a safety extra-low voltage). Since the material of the LED cover is electrically insulating, it reaches as an intermediate layer an additional electrical insulation of the LED support against the support. Due to the one-piece design further components can be saved, and it is an even easier installation possible.

Die Schutzabdeckung kann transparent oder diffus streuend sein. Die Ausführung als Diffusor verstärkt eine Homogenisierung des eingestrahlten Lichts.The protective cover may be transparent or diffused. The design as a diffuser enhances a homogenization of the incident light.

Die LED-Abdeckung ist vorzugsweise durch ihre Dicke hindurch gut wärmeleitend, um einen thermischen Übergangswiderstand gering und eine Wärmeableitung von den LEDs gegenüber dem Kühlkörper hoch zu halten. Dies kann dadurch erreicht werden, dass das Material in Bulk-Form gut wärmeleitend ist und/oder eine entsprechend geringe Dicke aufweist (dünn ist).The LED cover is preferably good heat-conducting through its thickness to a thermal contact resistance low and to keep heat dissipation from the LEDs to the heat sink high. This can be achieved in that the material in bulk form has good thermal conductivity and / or has a correspondingly small thickness (is thin).

Insbesondere kann die LED-Abdeckung (bzw. der Körper, der die LED-Abdeckung mit der Zwischenlage bildet) in Form eines zusammengerollten biegsamen Blatts vorliegen. Unter einem Blatt kann insbesondere ein Körper verstanden werden, dessen Ausdehnung in einer Ebene weit größer ist als seine Dicke. Ein besonders dünnes Blatt kann auch als eine Folie bezeichnet werden. Das zusammengerollte Blatt kann insbesondere eine hohlzylinderförmige Grundform aufweisen, und zwar beispielsweise mit einem kreisförmigen Querschnittsprofil, einem ovalen Querschnittsprofil, einem eckigen Querschnittsprofil, einem freiform-ähnlichen Querschnittsprofil usw.In particular, the LED cover (or the body forming the LED cover with the intermediate layer) may be in the form of a rolled-up flexible sheet. In particular, a body can be understood to mean a body whose extent in a plane is far greater than its thickness. A particularly thin sheet may also be referred to as a film. The rolled-up sheet may in particular have a hollow cylindrical basic shape, for example with a circular cross-sectional profile, an oval cross-sectional profile, a polygonal cross-sectional profile, a freeform-like cross-sectional profile, etc.

Das zusammengerollte Blatt stößt an einem (flächigen oder linienförmigen) Stoßbereich aufeinander und bildet einen entlang seiner Längsachse, um welche das Blatt gerollt ist, um die Längsachse umlaufend geschlossenen Körper. Dadurch wiederum kann zumindest in der Längsrichtung des zusammengerollten Blatts zumindest ein Abschnitt des LED-Trägers umlaufend von dem elektrisch isolierenden, biegsamen Körper umgeben sein. Dies erhöht einen elektrischen Schutz. Die zusammengerollte Form, welche z.B. durch ein passendes Biegen des Blatts erreichbar ist, vereinfacht eine Montage.The rolled-up sheet abuts one another at an abutting area (flat or linear) and forms one along its longitudinal axis, around which the sheet is rolled, around the longitudinal axis of the circumferentially closed body. As a result, in turn, at least in the longitudinal direction of the rolled-up sheet, at least a portion of the LED support may be circumferentially surrounded by the electrically insulating, flexible body. This increases electrical protection. The rolled up form, which e.g. can be reached by a suitable bending of the sheet, simplifies assembly.

Die zusammengerollte LED-Abdeckung kann an dem Stoßbereich aufeinander drücken, ohne fest miteinander verbunden zu sein. Es ist zur Verhinderung eines unbeabsichtigten Lösens des Stoßbereichs vorteilhaft, dass die zusammengerollte LED-Abdeckung an ihrem Stoßbereich fest verbunden ist.The rolled-up LED cover can press against each other at the butt portion without being firmly joined together. It is advantageous for preventing inadvertent release of the abutting portion that the rolled-up LED cover is fixedly connected at its abutting portion.

Es ist eine für eine Verhinderung eines unbeabsichtigten Lösens der blattförmigen LED-Abdeckung an ihrem Stoßbereich vorteilhafte Weiterbildung, dass die Seitenränder stoffschlüssig miteinander verbunden sind, insbesondere miteinander verschweißt (insbesondere laserverschweißt) oder verklebt sind. Insbesondere die Verschweißung weist den Vorteil auf, dass sie eine Heißverformung des Materials der LED-Abdeckung in dem Stoßbereich bewirkt, was normtechnisch eine feste Verbindung bewirkt. Als Folge wird eine gekapselte Einheit gebildet, welche eine Zahl möglicher Luft- und Kriechstrecken verkleinert.It is an advantageous for preventing unintentional release of the leaf-shaped LED cover at its joint area development that the side edges cohesively are connected to each other, in particular welded together (in particular laser welded) or glued. In particular, the welding has the advantage that it causes a hot deformation of the material of the LED cover in the joint area, which causes a solid connection by standards. As a result, an encapsulated unit is formed which reduces a number of possible clearance and creepage distances.

Es ist noch eine Ausgestaltung, dass die Auflage mindestens eine Montageausnehmung zur Aufnahme eines Teils der LED-Abdeckung aufweist. Die Montageausnehmung kann z.B. mindestens eine Nut in der Auflage umfassen, in welche das Material der LED-Abdeckung eingesteckt und/oder eingeklemmt werden kann.It is still an embodiment that the support has at least one mounting recess for receiving a portion of the LED cover. The mounting recess may be e.g. comprise at least one groove in the support, in which the material of the LED cover can be inserted and / or clamped.

Beispielsweise kann die LED-Abdeckung in Form eines zusammengerollten Blatts vorliegen, welches an seiner Außenseite zumindest teilweise über seinen Stoßbereich übersteht und mit zumindest einem Teil der freien Kante des überstehenden Bereichs in eine Längsnut in der Auflage presspassend eingesteckt ist. Die LED-Abdeckung mag so insbesondere mittels nur eines Randes oder mindestens eines Rastvorsprungs in die Auflage eingesteckt werden. Der freie Rand kann dazu passend gerade oder strukturiert aufgeformt sein, z.B. mit definierten Vorsprüngen versehen sein. Eine weitere mechanische Fixierung wird durch den Anpressdruck des LED-Trägers erreicht, dieser wiederum z.B. durch Niederhalter, Plastiknieten, mechanische Befestigungen usw.For example, the LED cover may be in the form of a rolled-up sheet which projects at least partially beyond its abutting area on its outer side and is press-fitted with at least part of the free edge of the projecting region into a longitudinal groove in the support. The LED cover may thus be inserted into the support in particular by means of only one edge or at least one latching projection. The free edge may be shaped to fit straight or textured, e.g. be provided with defined projections. Another mechanical fixation is achieved by the contact pressure of the LED carrier, which in turn is e.g. through hold-downs, plastic rivets, mechanical fasteners, etc.

In einer anderen Weiterbildung kann die LED-Abdeckung insbesondere eine nicht geschlossene Kontur oder Form aufweisen und z.B. zusammen mit der Auflage einen (ggf. endseitig offenen) Hohlraum für den bestückten LED-Träger bilden. Die LED-Abdeckung kann dann insbesondere mit zumindest einem Teil ihrer freien Ränder an der Auflage befestigt sein. Die LED-Abdeckung kann beispielsweise über den LED-Träger gestülpt sein. Die LED-Abdeckung kann z.B. mit gegenüberliegenden freien Rändern in zwei parallele Nuten der Auflage eingesteckt werden. Die LED-Abdeckung kann dazu insbesondere eine zumindest in etwa halbe hohlzylinderförmige Querschnittsform aufweisen. Durch die Breite der LED-Abdeckung wird auch deren Krümmung festgelegt. Die LED-Abdeckung kann insbesondere bei dieser Weiterbildung biegsam oder im Wesentlichen starr (nur gering biegsam und/oder selbsttragend) sein. Insbesondere bei der im Wesentlichen starren Ausgestaltung ist auch eine rotationssymmetrische Form möglich, z.B. eine kugelsegmentförmige LED-Abdeckung.In another development, the LED cover can in particular have a non-closed contour or shape and, for example, together with the support form a cavity (possibly open at the end) for the populated LED carrier. The LED cover can then be fastened to the support in particular with at least part of its free edges. The LED cover can, for example, be slipped over the LED carrier be. The LED cover can be inserted, for example, with opposing free edges in two parallel grooves of the support. For this purpose, the LED cover can in particular have an at least approximately half hollow cylindrical cross-sectional shape. The width of the LED cover also determines their curvature. In particular, in this development, the LED cover can be flexible or substantially rigid (only slightly flexible and / or self-supporting). Particularly in the case of the substantially rigid embodiment, a rotationally symmetrical shape is also possible, for example a spherical segment-shaped LED cover.

Die LED-Abdeckung kann allgemein aus einem Kunststoff bestehen.The LED cover can generally be made of a plastic.

Die LED-Abdeckung kann ferner mit lichtundurchlässigen Blendenbereichen versehen sein, um eine Form austretender Lichtstrahlen gezielt zu formen. Insbesondere kann ein Austrittswinkel des Lichts (Apertur) beeinflusst werden. Dies kann z.B. bei Speziallampen zum Lesen, Musizieren usw. vorteilhaft sein. Die Blendenbereiche können beispielsweise durch eine Metallisierung oder eine andere reflektierende Schicht der LED-Abdeckung gebildet werden.The LED cover may further be provided with opaque aperture areas to selectively shape a shape of emergent light rays. In particular, an exit angle of the light (aperture) can be influenced. This can e.g. be advantageous in special lamps for reading, playing music, etc. The aperture areas can be formed for example by a metallization or another reflective layer of the LED cover.

Es ist noch eine Ausgestaltung, dass zumindest an einer Vorderseite des LED-Trägers vorhandene Leiterbahnen mittels einer Leiterbahnabdeckung unmittelbar (also ohne einen Abstand oder Hohlraum) abgedeckt sind. Dadurch können zur Erhöhung eines elektrischen Schutzes die Kriechstrecken verlängert werden.It is still an embodiment that at least on a front side of the LED carrier existing interconnects by means of a conductor track cover directly (ie without a distance or cavity) are covered. As a result, the creepage distances can be extended to increase electrical protection.

Es ist eine Weiterbildung, dass die Leiterbahnabdeckung aus Glas oder einem glasartigen Material besteht. Das Glas (oder glasartige Material) kann z.B. mittels eines (Glas-)Druckverfahrens aufgebracht und z.B. anschließend in den LED-Träger eingebrannt werden. Für das Einbrennen, welches vorzugsweise in einem Temperaturbereich von ca. 600 °C bis 850°C durchgeführt wird, wird ein hochtemperaturbeständiges Grundmaterial des LED-Trägers bevorzugt, insbesondere eine Keramik, z.B. Aluminiumoxid oder Aluminiumnitrid.It is a development that the conductor track cover made of glass or a glassy material. The glass (or glassy material) can be applied, for example, by means of a (glass) printing process and then, for example, baked in the LED carrier. For the baking, which preferably in a temperature range of about 600 ° C to 850 ° C. is carried out, a high temperature resistant base material of the LED support is preferred, in particular a ceramic, for example alumina or aluminum nitride.

Es ist noch eine Ausgestaltung, dass die Leiterbahnabdeckung im Wesentlichen die gesamte Vorderseite des LED-Trägers außerhalb der LEDs abdeckt. Dies verlängert Kriechstrecken besonders zuverlässig.It is still an embodiment that the conductor track cover covers substantially the entire front of the LED carrier outside the LEDs. This extends creepage distances particularly reliably.

Es ist auch eine Ausgestaltung, dass zwischen der Rückseite des LED-Trägers und der Auflage ein thermisch leitfähiges Wärmeleitmaterial, insbesondere TIM ("Thermal Interface Material"; z.B. eine Wärmeleitpaste oder Wärmeleitkleber), insbesondere ein Wärmeleitkleber, vorhanden ist. Dadurch kann eine Wärmeableitung von den LEDs zu der Auflage besonders effektiv gestaltet werden. Es ist eine Weiterbildung, dass der LED-Träger über das thermisch leitfähige Wärmeleitmaterial direkt mit der Auflage verbunden ist.It is also an embodiment that a thermally conductive heat-conducting material, in particular TIM ("Thermal Interface Material", for example a thermal paste or heat-conducting adhesive), in particular a thermal adhesive, is present between the rear side of the LED carrier and the support. As a result, heat dissipation from the LEDs to the support can be made particularly effective. It is a development that the LED carrier is connected via the thermally conductive Wärmeleitmaterial directly to the support.

Die LED-Abdeckung kann beispielsweise in eine Aussparung in der Auflage eingesetzt werden, in welcher auch der LED-Träger aufgenommen ist. Insbesondere, wenn die Aussparung eine stufenartige Begrenzung aufweist, kann die Abdeckung die Begrenzung als einen Anschlag zu ihrer genauen Positionierung verwenden. Alternativ kann die Auflage eine dedizierte Montageausnehmung, z.B. Längsnuten zum Einsetzen der LED-Abdeckung, aufweisen. Die LED-Abdeckung kann darin eingeklemmt oder verklebt werden, z.B. mittels einer Kleberdispensierung.The LED cover can be used, for example, in a recess in the support, in which also the LED support is received. In particular, if the recess has a step-like boundary, the cover may use the boundary as a stop for its accurate positioning. Alternatively, the pad may have a dedicated mounting recess, e.g. Longitudinal grooves for inserting the LED cover, have. The LED cover can be clamped or glued therein, e.g. by means of a glue dispensing.

Es ist eine für eine effektive elektrische Isolierung der LEDs und der Leiterbahnen vorteilhafte Ausgestaltung, dass der LED-Träger einen Grundkörper aus einer elektrisch isolierenden Keramik (z.B. Aluminiumoxid, Aluminiumnitrid usw.) aufweist. Keramik weist allgemein eine hohe Durchschlagsfestigkeit auf. Insbesondere die Verwendung eines LED-Trägers mit einem Keramik-Grundkörper ermöglicht ein Betreiben der Leuchtdioden mit einer höheren als einer Kleinspannung oder Schutzspannung ("Non-SELV"-Ansteuerung). Alternativ kann der LED-Träger z.B. einen Grundkörper aus einem Leiterplatten-Basismaterial aufweisen, z.B. FR4 (besonders preiswert) oder eine Metallkernplatine (besonders gute Wärmespreizung) sein.It is an embodiment which is advantageous for effective electrical insulation of the LEDs and the strip conductors that the LED carrier has a base body made of an electrically insulating ceramic (eg aluminum oxide, aluminum nitride, etc.). Ceramic generally has high dielectric strength. In particular, the use of an LED carrier with a ceramic base body allows operation of the LEDs with a higher than a low voltage or Protection voltage ("Non-SELV" control). Alternatively, the LED carrier may, for example, have a main body of a printed circuit board base material, eg FR4 (particularly inexpensive) or a metal core board (particularly good heat spreading).

Es ist noch eine Ausgestaltung, dass die Auflage mindestens eine Aussparung mit einem abgestuften Rand zum Einsetzen des LED-Trägers und der LED-Abdeckung aufweist. Dadurch kann eine Positionierung der LED-Abdeckung erleichtert werden. Auch kann der abgestufte Rand bzw. die Stufe insbesondere bei einer LED-Abdeckung in Form eines gerollten Blatts deren Form gezielt beeinflussen, z.B. eine Biegung in einem Bereich der Stufe erzwingen.It is yet an embodiment that the support has at least one recess with a stepped edge for insertion of the LED carrier and the LED cover. This can facilitate positioning of the LED cover. Also, the stepped edge or step, in particular in the case of an LED cover in the form of a rolled sheet, can specifically influence its shape, e.g. force a bend in one area of the step.

Es ist zudem eine Ausgestaltung, dass die LED-Leuchtvorrichtung eine LED-Röhren-Retrofitlampe ist. Eine LED-Röhren-Retrofitlampe ist zum Ersatz einer röhrenförmigen Lampe vorgesehen, z.B. einer Leuchtstoffröhre, einer Linienlampe usw. Dabei ist es vorteilhaft, wenn die Auflage ein Kühlkörper ist. Der LED-Träger und die LED-Abdeckung sind dann bevorzugt von länglicher Gestalt. So können der LED-Träger bandförmig, die Abdeckung zylinderförmig oder zylinderschnittförmig und/oder die Auflage zylinderschnittförmig, insbesondere halbzylinderförmig, ausgestaltet sein. Jedoch ist die LED-Leuchtvorrichtung nicht auf eine Ausgestaltung als Röhrenlampe beschränkt.It is also an embodiment that the LED lighting device is a LED tube retrofit lamp. An LED tube retrofit lamp is intended to replace a tubular lamp, e.g. a fluorescent tube, a line lamp, etc. It is advantageous if the support is a heat sink. The LED carrier and the LED cover are then preferably of elongated shape. Thus, the LED carrier band-shaped, the cover cylindrical or cylindrical section and / or the support cylindrical section, in particular semi-cylindrical, be configured. However, the LED lighting device is not limited to a configuration as a tube lamp.

Die Aufgabe wird auch gelöst durch ein Verfahren zum Herstellen einer LED-Leuchtvorrichtung, bei der die LED-Abdeckung eine Zwischenlage zwischen der Rückseite des LED-Trägers und der Auflage bildet bzw. aus einem Körper gebildet ist, welcher auch eine Zwischenlage zwischen der Rückseite des LED-Trägers und der Auflage bildet. Das Verfahren weist mindestens die folgenden Schritte auf:

  • Aufbringen eines Abschnitts der LED-Abdeckung auf der Auflage;
  • Auflegen und Befestigen des LED-Trägers auf diesen Abschnitt der LED-Abdeckung;
  • Umlegen des nicht auf der Auflage aufliegenden Abschnitts der LED-Abdeckung über den LED-Träger, so dass dieser Abschnitt den LED-Träger überwölbt; und
  • Befestigen des umgelegten Abschnitts so, dass die LED-Abdeckung in einer zusammengerollten Form vorliegt.
The object is also achieved by a method for producing an LED lighting device, wherein the LED cover forms an intermediate layer between the back of the LED support and the support or is formed from a body, which also has an intermediate layer between the back of the LED carrier and pad forms. The procedure has at least the following steps:
  • Applying a portion of the LED cover to the overlay;
  • Placing and fixing the LED carrier on this portion of the LED cover;
  • Moving the non-overlay portion of the LED cover over the LED carrier so that this portion overhangs the LED carrier; and
  • Attach the folded portion so that the LED cover is in a rolled-up form.

Durch das Auflegen und Befestigen des LED-Trägers wird der darunterliegende Abschnitt der LED-Abdeckung insbesondere auf die Auflage gedrückt und dadurch fixiert.By placing and fixing the LED support, the underlying portion of the LED cover is pressed in particular on the support and thereby fixed.

Das Aufbringen der LED-Abdeckung und das Auflegen des LED-Trägers geschieht vorzugsweise so, dass an einer Seite des LED-Trägers ein vergleichsweise breiter Abschnitt der LED-Abdeckung zum Umlegen über den LED-Träger und an der anderen Seite des LED-Trägers ein vergleichsweise schmaler Abschnitt der LED-Abdeckung zum Herstellen des Stoßbereichs (oder Kontaktbereichs) vorsteht.The application of the LED cover and placing the LED support is preferably done so that on one side of the LED support a comparatively wide portion of the LED cover to flip over the LED support and on the other side of the LED support a comparatively narrow portion of the LED cover protrudes to make the abutting portion (or contact portion).

Das Befestigen des umgelegten Abschnitts kann z.B. durch ein Einstecken der LED-Abdeckung in eine Montageausnehmung der Auflage oder durch ein Verbinden der LED-Abdeckung an dem Stoßbereich erreicht werden.The attachment of the folded portion may be e.g. be achieved by plugging the LED cover in a mounting recess of the support or by connecting the LED cover to the joint area.

Die Aufgabe wird auch gelöst durch ein Verfahren zum Herstellen einer LED-Leuchtvorrichtung, bei der die LED-Abdeckung aus einem Körper gebildet ist, welcher nicht auch eine Zwischenlage zwischen der Rückseite des LED-Trägers und der Auflage bildet. Das Verfahren weist mindestens die folgenden Schritte auf:

  • Aufbringen eines Wärmeleitmaterials, insbesondere Dispergieren eines Wärmeleitklebers, auf der Auflage;
  • Auflegen der Rückseite des bestückten LED-Trägers auf das Wärmeleitmaterial;
  • Befestigen des LED-Trägers an dem Wärmeleitmaterial, z.B. durch Aushärtenlassen des Wärmeleitklebers;
  • Anordnen der LED-Abdeckung, z.B. einer gebogenen Folie, über dem LED-Träger; und
  • Befestigen der LED-Abdeckung.
The object is also achieved by a method for producing an LED lighting device in which the LED cover is formed of a body which does not also form an intermediate layer between the back of the LED support and the support. The procedure has at least the following steps:
  • Applying a Wärmeleitmaterials, in particular dispersing a Wärmeleitklebers, on the support;
  • Placing the back of the populated LED carrier on the thermal interface material;
  • Attaching the LED carrier to the thermal interface material, eg, by allowing the thermal adhesive to cure;
  • Placing the LED cover, eg a curved foil, over the LED carrier; and
  • Attach the LED cover.

Das Anordnen der LED-Abdeckung kann insbesondere dadurch erreicht werden, dass die LED-Abdeckung in eine Aussparung der Auflage mit einem stufenförmigen Rand eingesetzt wird, welche auch der Aufnahme des LED-Trägers dient. Der Rand kann dann als ein seitlicher Anschlag für die LED-Abdeckung dienen, um diese genau zu positionieren.The arrangement of the LED cover can be achieved, in particular, by inserting the LED cover into a recess of the support with a step-shaped edge, which also serves to receive the LED support. The rim can then serve as a side stop for the LED cover to accurately position it.

Das Befestigen des LED-Trägers an dem Wärmeleitmaterial kann allgemein mittels des Wärmeleitmaterials geschehen, z.B. wenn das Wärmeleitmaterial auch als ein Haftmittel dient, oder durch weitere Mittel, z.B. Schrauben oder Niederhalter, z.B. wenn das Wärmeleitmaterial selbst nicht der Befestigung dient, beispielsweise bei einer Ausgestaltung als Wärmeleitkissen ("TIM-Pad") oder Wärmeleitfolie.The attachment of the LED carrier to the thermal interface material may generally be by means of the thermal interface material, e.g. if the thermal interface material also serves as an adhesive, or by other means, e.g. Screws or downholders, e.g. if the heat conduction material itself does not serve the attachment, for example, in an embodiment as a heat conduction pad ("TIM pad") or heat conduction.

Das Befestigen der LED-Abdeckung kann insbesondere an der Auflage durchgeführt werden, insbesondere mittels einer Klebewulst.The fixing of the LED cover can be carried out in particular on the support, in particular by means of an adhesive bead.

In den folgenden Figuren wird die Erfindung anhand von Ausführungsbeispielen schematisch genauer beschrieben. Dabei können zur Übersichtlichkeit gleiche oder gleichwirkende Elemente mit gleichen Bezugszeichen versehen sein.

Fig.1
zeigt als Schnittdarstellung in Draufsicht eine LED-Röhrenlampe gemäß einer ersten Ausführungsform;
Fig.2
zeigt als Schnittdarstellung in Frontalansicht eine LED-Röhrenlampe gemäß einer zweiten Ausführungsform; und
Fig.3
zeigt als Schnittdarstellung in Frontalansicht einen Ausschnitt einer LED-Röhrenlampe gemäß einer dritten Ausführungsform
In the following figures, the invention will be described schematically with reference to exemplary embodiments. In this case, the same or equivalent elements may be provided with the same reference numerals for clarity.
Fig.1
shows a sectional top view of an LED tube lamp according to a first embodiment;
Fig.2
shows a sectional front view of an LED tube lamp according to a second embodiment; and
Figure 3
shows a sectional view in front view of a section of an LED tube lamp according to a third embodiment

Fig.1 zeigt eine LED-Röhrenlampe 1, welche insbesondere als eine Retrofitlampe für herkömmliche Röhrenlampen wie eine Leuchtstoffröhre, eine Linienlampe usw. verwendbar ist. Die LED-Röhrenlampe 1 weist eine im Wesentlichen zylinder- bzw. röhrenförmige Grundform auf, deren Längsachse in der gezeigten Darstellung senkrecht zur Bildebene steht. An den Enden der LED-Röhrenlampe 1 können sich Abdeckkappen zur mechanischen und/oder elektrischen Verbindung der Lampe mit einer entsprechenden Fassung einer Leuchte befinden (o.Abb.). Fig.1 shows an LED tube lamp 1, which is particularly useful as a retrofit lamp for conventional tube lamps such as a fluorescent tube, a line lamp, etc. The LED tube lamp 1 has a substantially cylindrical or tubular basic shape whose longitudinal axis is perpendicular to the image plane in the illustration shown. At the ends of the LED tube lamp 1 cover caps for mechanical and / or electrical connection of the lamp with a corresponding version of a lamp can be (o.Fig.).

Die LED-Röhrenlampe 1 weist in ihrer unteren Hälfte, nämlich den Querschnitt ungefähr halbkreisförmig ausfüllend, eine Auflage in Form eines Kühlkörpers 2 auf. Der Kühlkörper 2 kann beispielsweise Kühlrippen aufweisen. Eine in dieser Darstellung nach oben gerichtete Oberseite 3 des Kühlkörpers 2 weist eine im Querschnitt rechteckige Aussparung 4 in ihrer Mitte auf, d.h., dass die Aussparung 4 in einer Ebene senkrecht zur Bildebene geradlinig verläuft.The LED tube lamp 1 has in its lower half, namely the cross-section approximately semicircular filling, a support in the form of a heat sink 2. The heat sink 2 may have, for example, cooling fins. An upper side 3 of the heat sink 2, which is directed upward in this illustration, has a cross-sectionally rectangular recess 4 in its center, that is to say that the recess 4 runs in a straight line in a plane perpendicular to the image plane.

In die Aussparung 4 eingebracht ist ein LED-Träger 5, welcher an seiner Oberseite oder Vorderseite 6 mit mehreren Leuchtdioden (LEDs) 7 und Leiterbahnen 8 bestückt bzw. belegt ist. Die Leuchtdioden 7 sind vorzugsweise in Längsrichtung der LED-Röhrenlampe 1 äquidistant in einer Reihe angeordnet. Die Leiterbahnen 8 verbinden beispielsweise die Leuchtdioden 7 miteinander und mit einer elektronischen Ansteuerung.Inserted into the recess 4 is an LED carrier 5, which is equipped or occupied on its upper side or front side 6 with a plurality of light-emitting diodes (LEDs) 7 and printed conductors 8. The light-emitting diodes 7 are preferably arranged equidistantly in a row in the longitudinal direction of the LED tube lamp 1. The interconnects 8 connect, for example, the LEDs 7 together and with an electronic control.

Die Leiterbahnen 8 sind von einer Leiterbahnabdeckung 9 aus Glas oder einem glasartigen Material abgedeckt, so dass eine Kriechstrecke K zu den Leuchtdioden 7 mindestens bis zu einem seitlichen Rand der Leiterbahnabdeckung 9, hier angedeutet durch den Abstand K, reicht.The conductor tracks 8 are covered by a conductor track cover 9 made of glass or a glassy material, so that a creepage distance K to the LEDs 7 at least up to a lateral edge of the conductor track cover 9, indicated here by the distance K, extends.

An seiner Rückseite 10 liegt der LED-Träger 6 über eine Lage aus einem Wärmeleitkleber 11 auf einem Boden der Aussparung 4 auf. Der bestückte LED-Träger 5 ist über seine gesamte Länge von einer LED-Abdeckung 12 überwölbt, welche ebenfalls in der Aussparung 4 sitzt, und zwar so, dass sie seitlich gegen einen abgestuften Rand 13 der Aussparung 4 drückt, so dass der abgestufte Rand 13 gleichzeitig einen seitlichen Anschlag für die LED-Abdeckung 12 darstellt.On its rear side 10, the LED carrier 6 rests on a layer of a thermal adhesive 11 on a bottom of the recess 4. The populated LED carrier 5 is arched over its entire length by an LED cover 12, which also in the Recess 4 is seated, in such a way that it presses laterally against a stepped edge 13 of the recess 4, so that the stepped edge 13 simultaneously represents a lateral stop for the LED cover 12.

Die LED-Abdeckung 12 besteht hier aus einem elektrisch isolierenden, lichtdurchlässigen und diffus streuenden Material, so dass die LED-Abdeckung 12 gleichzeitig als elektrische Isolierung und als ein optischer Diffusor dient. Die dem LED-Träger 5 zugewandte Innenseite kann teilweise mittels einer lichtundurchlässigen Blendenschicht 14 bedeckt sein, z.B. einer Metallisierung, so dass Licht von den Leuchtdioden nur durch ein von der Blendenschicht 14 freigelassenes Fenster 15 hindurchläuft.Here, the LED cover 12 consists of an electrically insulating, transparent and diffusely scattering material, so that the LED cover 12 simultaneously serves as electrical insulation and as an optical diffuser. The inner side facing the LED carrier 5 may be partially covered by an opaque aperture layer 14, e.g. a metallization, so that light from the LEDs only passes through a released from the aperture layer 14 window 15.

Die LED-Abdeckung 12 kann aus Kunststoff bestehen, hier beispielsweise in Form eines halbkreiszylinderförmigen Kunststoffkörpers realisiert, wobei die LED-Abdeckung 12 hier vorzugsweise selbsttragend und nur geringfügig elastisch biegbar ist. Durch die elastische Biegbarkeit der LED-Abdeckung 12 kann diese beispielsweise beidseitig seitlich eingedrückt und dann in die Aussparung 4 eingesetzt werden, wobei nach einer Beendigung der beidseitigen Krafteinleitung die LED-Abdeckung 12 wieder seitlich zurückfedert und so durch eine Presspassung in der Aussparung 4 gehalten werden kann. Um eine noch sicherere Verbindung zwischen der LED-Abdeckung 12 und dem Kühlkörper 2 zu ermöglichen, beispielsweise um ein Ablösen der LED-Abdeckung 12 während eines Transports usw. zu verhindern, ist an einer Stoßkante zwischen der Oberfläche 3 und der LED-Abdeckung 12 eine Klebewulst 17 aufgebracht, z.B. durch Dispensieren eines zunächst flüssigen und dann aushärtenden Klebers.The LED cover 12 may be made of plastic, realized here for example in the form of a semicircular cylindrical plastic body, wherein the LED cover 12 is here preferably self-supporting and only slightly elastically bendable. Due to the elastic bendability of the LED cover 12, this can be pressed in laterally on both sides and then inserted into the recess 4, wherein after completion of the two-sided introduction of force, the LED cover 12 spring back again laterally and are held by a press fit in the recess 4 can. In order to allow an even more secure connection between the LED cover 12 and the heat sink 2, for example, to prevent detachment of the LED cover 12 during transportation, etc., at a abutting edge between the surface 3 and the LED cover 12 is a Adhesive 17 applied, eg by dispensing a first liquid and then curing adhesive.

Die Oberseite 3 des Kühlkörpers 2 wird als Ganzes von einer (transparenten oder diffus streuenden) Schutzabdeckung 16 überwölbt. Die Schutzabdeckung 16 weist eine im Wesentlichen halbkreiszylinderförmige Querschnittsform auf und setzt bezüglich einer Außenkontur flächenbündig an dem Kühlkörper 2 an. Die Außenkontur des Kühlkörpers 2 und die Außenkontur der Schutzabdeckung 16 bilden zusammen zumindest im Wesentlichen eine zylinderförmige Fläche. Die Schutzabdeckung 16 kann beispielsweise mit dem Kühlkörper 2 verklebt sein und beispielsweise in randseitige Längsnuten (o.Abb.) des Kühlkörpers 2, welche als eine Montageausnehmung dienen, eingesteckt sein. Die Schutzabdeckung 16 besteht ebenfalls aus einem elektrisch isolierenden Material und bewirkt, dass der LED-Träger 5 mit den auf seiner Oberseite befindlichen Leuchtdioden 7 und Leiterbahnen 8 zusammen mit der LED-Abdeckung 12 doppelt geschützt ist. Dadurch können insbesondere elektrisch kritische Luftstrecken vermieden werden.The upper side 3 of the heat sink 2 is overarched as a whole by a (transparent or diffusely scattering) protective cover 16. The protective cover 16 has a substantially semicircular cylindrical cross-sectional shape and sets with respect to an outer contour flush with the heat sink 2 at. The outer contour of the heat sink 2 and the outer contour of the protective cover 16 together form at least substantially a cylindrical surface. The protective cover 16 may for example be glued to the heat sink 2 and, for example, in edge-side longitudinal grooves (o.Fig.) Of the heat sink 2, which serve as a mounting recess, inserted. The protective cover 16 is also made of an electrically insulating material and causes the LED carrier 5 is double-protected with the LEDs 7 and printed conductors 8 located on its upper side together with the LED cover 12. As a result, especially electrically critical air gaps can be avoided.

Die LED-Röhrenlampe 1 kann unter anderem dadurch hergestellt werden, dass zunächst der Wärmeleitkleber 11 in der Aussparung 4 dispensiert wird. Dann wird der bestückte LED-Träger 5 mit seiner Rückseite 10 auf den Wärmeleitkleber 11 aufgedrückt, und es wird gewartet, bis der Wärmeleitkleber 11 ausgehärtet ist, so dass der LED-Träger 5 sicher an dem Kühlkörper 2 haftet. In einem folgenden Schritt wird die LED-Abdeckung 12 in die Aussparung 4 eingesetzt und dann durch die Klebewulst 17 mit dem Kühlkörper 2 verklebt. Dann kann die Schutzabdeckung 16 auf den Kühlkörper aufgesetzt und dort befestigt werden. In noch einem weiteren Schritt können die noch offenen Enden der sich bis dahin ergebenden LED-Röhrenlampe 1 mit entsprechenden Kappen zur mechanischen und/oder elektrischen Kontaktierung versehen werden.The LED tube lamp 1 can be produced inter alia by first dispensing the thermal adhesive 11 in the recess 4. Then the populated LED carrier 5 is pressed with its back 10 on the Wärmeleitkleber 11, and it is waited until the Wärmeleitkleber 11 is cured, so that the LED support 5 securely adheres to the heat sink 2. In a following step, the LED cover 12 is inserted into the recess 4 and then glued by the adhesive bead 17 with the heat sink 2. Then, the protective cover 16 can be placed on the heat sink and fastened there. In yet another step, the still open ends of the hitherto resulting LED tube lamp 1 can be provided with corresponding caps for mechanical and / or electrical contact.

Bei einem Betrieb der LED-Röhrenlampe 1 strahlen die LEDs 7 Licht durch das Fenster 15 ab, wobei eine annähernd punktförmige Lichtverteilung am Ort der LEDs 7 durch die diffus streuende Eigenschaft der LED-Abdeckung 12 homogenisiert wird. Der durch das Fenster 15 austretende Lichtstrahl läuft weiter durch die Schutzabdeckung 16, wobei die Schutzabdeckung 16 dann, wenn sie auch eine strahlformende Eigenschaft aufweist, beispielsweise durch darin integrierte Linsenbereiche, den durch sie hindurchlaufenden Lichtstrahl nochmals formen, beispielsweise fokussieren oder aufweiten kann.During operation of the LED tube lamp 1, the LEDs 7 emit light through the window 15, wherein an approximately point-shaped light distribution at the location of the LEDs 7 is homogenized by the diffusely scattering property of the LED cover 12. The light beam exiting through the window 15 continues to pass through the protective cover 16, the protective cover 16, although it also has a beam-forming property, for example by lens regions integrated therein, shape the light beam passing through it again, for example, focus or widen.

Die von den LEDs 7 erzeugte Abwärme wird durch den LED-Träger 5 und den Wärmeleitkleber 11 auf den Kühlkörper 2 übertragen. Dadurch, dass der Wärmeleitkleber 11 einen geringen thermischen Widerstand besitzt und zudem sehr dünn aufgetragen werden kann, kann die Wärme von dem LED-Träger 5 im Wesentlichen ungehindert auf den Kühlkörper 2 übertragen werden.The waste heat generated by the LEDs 7 is transmitted to the heat sink 2 by the LED carrier 5 and the thermal adhesive 11. Due to the fact that the heat-conducting adhesive 11 has a low thermal resistance and, moreover, can be applied very thinly, the heat from the LED carrier 5 can be transmitted to the heat sink 2 substantially unhindered.

Der LED-Träger 5 weist hier vorzugsweise ein Basismaterial aus Keramik (Aluminiumoxid, Aluminiumnitrid usw.) auf, so dass er erstens elektrisch sehr gut isoliert, eine hohe Durchschlagsfestigkeit aufweist, eine hohe Wärmebeständigkeit aufweist, was insbesondere bei einer Auftragung der Leiterbahnabdeckung 9 aus Glas vorteilhaft ist und zudem eine sehr gute thermische Leitfähigkeit aufweist, so dass die Leuchtdioden 7 sehr effektiv kühlbar sind.Here, the LED carrier 5 preferably has a base material made of ceramics (alumina, aluminum nitride, etc.) so that it firstly has a very good electrical insulation, a high dielectric strength, a high heat resistance, which is particularly useful when the conductor track cover 9 is made of glass is advantageous and also has a very good thermal conductivity, so that the LEDs 7 are very effective coolable.

Fig.2 zeigt eine LED-Röhrenlampe 21 gemäß einer zweiten Ausführungsform. Im Gegensatz zur LED-Röhrenlampe 1 ist die LED-Abdeckung 22 nun so ausgeführt, dass sie gleichzeitig als die Zwischenlage 27 dient. Dazu besteht die LED-Abdeckung 22 aus einem ursprünglich rechteckigen Blatt (einem Körper, dessen Dicke erheblich geringer ist als seine ebene Ausdehnung) aus einem elektrisch isolierenden, lichtdurchlässigen und diffus streuenden Material, insbesondere Kunststoff. Die LED-Abdeckung 22 wird folgend in einen zusammengerollten Zustand überführt, der hier gezeigt ist, bei dem durch die LED-Abdeckung 22 ein Kontakt- oder Stoßbereich 23 gebildet wird, an dem zwei Bereiche der LED-Abdeckung 22 aufeinanderstoßen. Dabei kann der zusammengerollte Zustand nicht nur durch eine Rollbewegung sondern auch durch jegliche andere Verbiegung des Blatts erreicht werden, beispielsweise durch großflächiges Verbiegen entlang einer oder mehrerer Biegelinien. Fig.2 shows an LED tube lamp 21 according to a second embodiment. In contrast to the LED tube lamp 1, the LED cover 22 is now designed so that it serves as the intermediate layer 27 at the same time. For this purpose, the LED cover 22 consists of an originally rectangular sheet (a body whose thickness is considerably smaller than its planar extent) made of an electrically insulating, translucent and diffusely scattering material, in particular plastic. The LED cover 22 is subsequently transferred to a rolled-up state shown here in which a contact or abutting portion 23 is formed by the LED cover 22, on which two portions of the LED cover 22 collide. In this case, the rolled-up state can be achieved not only by a rolling movement but also by any other bending of the blade, for example by large-scale bending along one or more bending lines.

Bei der LED-Röhrenlampe 21 ist die LED-Abdeckung 22 so montiert worden, dass zunächst das die LED-Abdeckung 22 bildende Blatt auf den Kühlkörper gelegt wird, so dass es die Aussparung 4 überdeckt. Dann wird der LED-Träger 5 mit seiner Rückseite 10 in die Aussparung 4 eingesetzt und auf den in der Auflage 2 befindlichen Teil der LED-Abdeckung 22 (welche als die Zwischenlage 27 dienen soll) aufgedrückt, z.B. durch Niederhalter oder andere Befestigungselemente. Da der LED-Träger 5 schmaler ist als die Aussparung 4, verbleibt auf einer Seite ein schmaler Abschnitt 24 der LED-Abdeckung 22 frei, und auf der anderen Seite verbleibt ein breiter Abschnitt 25 der LED-Abdeckung 22 frei. Durch den abgestuften Rand 13 der Aussparung 4 werden der schmale Abschnitt 24 und der breite Abschnitt 25 dort hochgebogen. Der schmale Abschnitt 24 weist somit einen nach schräg oben gerichteten, vorzugsweise aus der Aussparung 4 herausschauenden freien Seitenrand auf.In the LED tube lamp 21, the LED cover 22 has been mounted so that the sheet constituting the LED cover 22 is first placed on the heat sink so as to cover the recess 4. Then, the LED carrier 5 is inserted with its rear side 10 into the recess 4 and pressed onto the part of the LED cover 22 (which should serve as the intermediate layer 27) located in the support 2, e.g. by hold-down or other fasteners. Since the LED carrier 5 is narrower than the recess 4, a narrow portion 24 of the LED cover 22 remains exposed on one side, and on the other side, a wide portion 25 of the LED cover 22 remains free. By the stepped edge 13 of the recess 4 of the narrow portion 24 and the wide portion 25 are bent up there. The narrow portion 24 thus has an obliquely upwardly directed, preferably out of the recess 4 looking out free side edge.

Als nächstes wird der breite Abschnitt 25 einfach über den bestückten LED-Träger 5 herübergebogen und mit seinem freien Rand an dem freien Rand des schmalen Abschnitts 24 vorbei in eine als Längsnut ausgebildete Montageausnehmung 26 in der Oberfläche 3 des Kühlkörpers 2 eingesteckt. Dabei drückt zumindest der freie Rand des schmalen Abschnitts 24 gegen den breiten Abschnitt 25 und bildet so einen den LED-Träger 5 in Längsrichtung der LED-Röhrenlampe 21 umschließenden, elektrisch isolierenden Körper. Die Endflächen stehen bis dahin weiterhin offen, können aber geeignet verschlossen werden, beispielsweise durch ein Zusammenziehen oder Zusammenpressen, so dass die LED-Abdeckung 22 für den LED-Träger 5 eine im Wesentlichen (bis beispielsweise auf flächengrößenmäßig vernachlässigbare Durchführungen für Befestigungselemente oder elektrische Leitungen) allseitig umschlossen wird. Bei der LED-Röhrenlampe 21 wird der Stoßbereich ausschließlich durch den mechanischen Druck des schmalen Abschnitts 24 auf den breiten Abschnitt 25 aufrechterhalten, es ist keine Nachbearbeitung an dem Stoßbereich 23 erforderlich.Next, the wide portion 25 is simply bent over the populated LED support 5 and inserted with its free edge past the free edge of the narrow portion 24 in a trained as a longitudinal groove mounting recess 26 in the surface 3 of the heat sink 2. In this case, at least the free edge of the narrow portion 24 presses against the wide portion 25 and thus forms a the LED support 5 in the longitudinal direction of the LED tube lamp 21 enclosing, electrically insulating body. The end surfaces are still open until then, but can be suitably closed, for example by contraction or compression, so that the LED cover 22 for the LED carrier 5 is a substantially (up to, for example, size negligible passages for fasteners or electrical lines) enclosed on all sides. In the LED tube lamp 21, the impact area is maintained solely by the mechanical pressure of the narrow portion 24 on the wide portion 25, no post-processing on the abutment portion 23 is required.

Die Montageausnehmung 26 und/oder der freie seitliche Rand des breiten Abschnitts 25 können vor einem Einstecken des freien Rands in die Montageausnehmung 26 mit einem Haftmittel versehen werden, um ein unbeabsichtigtes Lösen der LED-Abdeckung 22, 25 aus der Montageausnehmung 26 sicher zu verhindern.The mounting recess 26 and / or the free lateral edge of the wide portion 25 may be provided prior to insertion of the free edge in the mounting recess 26 with an adhesive to prevent inadvertent release of the LED cover 22, 25 from the mounting recess 26 safely.

Je nachdem, welche mechanischen Eigenschaften die LED-Abdeckung 22 aufweist, insbesondere, ob sie im Wesentlichen rein elastisch verformbar oder auch praktisch plastisch verformbar ist, kann der breite Abschnitt 25 der LED-Abdeckung 22 einfach über den bestückten LED-Träger 5 herübergeführt werden (insbesondere bei einem sich im Wesentlichen elastisch verformenden Blatt, welches vorzugsweise auch selbsttragend ist), oder der breite Abschnitt 25 kann entlang definierter Biegelinien abschnittsweise plastisch verbogen werden (insbesondere bei einem sich plastisch verbiegenden Blatt). Diese mechanischen Eigenschaften der LED-Abdeckung 22 lassen sich beispielsweise durch eine Auswahl eines Materials, insbesondere Kunststoffs, mit geeigneten mechanischen Bulk-Eigenschaften und/oder durch eine Wahl einer Schichtdicke d einstellen. Dabei kann eine geringere Schichtdicke d zur Verringerung eines thermischen Übergangswiderstands zwischen der Rückseite 10 des LED-Trägers 5 und dem Kühlkörper 2 vorteilhaft sein. Vorteilhafterweise ist die Dicke d der LED-Abdeckung 22 nur in dem Bereich, der unter dem LED-Träger angeordnet wird, gegenüber dem die LEDs überdeckenden Bereich reduziert. Dadurch wird eine mechanisch stabile Überdeckung der LEDs wie auch eine gute Wärmeabfuhr gewährleistet. Zur effektiveren Wärmeabfuhr wird es allgemein bevorzugt, dass das Material der LED-Abdeckung 22 thermisch gut wärmeleitfähig ist.Depending on which mechanical properties the LED cover 22 has, in particular whether it is substantially purely elastically deformable or also practically plastically deformable, the wide section 25 of the LED cover 22 can be easily brought over the populated LED carrier 5 ( in particular in the case of a substantially elastically deforming blade, which is preferably also self-supporting), or the broad portion 25 can be plastically bent in sections along defined bending lines (in particular in the case of a plastically bending blade). These mechanical properties of the LED cover 22 can be adjusted, for example, by selecting a material, in particular plastic, with suitable mechanical bulk properties and / or by selecting a layer thickness d. In this case, a smaller layer thickness d for reducing a thermal contact resistance between the rear side 10 of the LED carrier 5 and the heat sink 2 may be advantageous. Advantageously, the thickness d of the LED cover 22 is reduced only in the region which is arranged below the LED carrier with respect to the region covering the LEDs. This ensures a mechanically stable overlap of the LEDs as well as a good heat dissipation. For more effective heat removal, it is generally preferred that the material of the LED cover 22 be thermally well thermally conductive.

Auch die LED-Abdeckung 22 kann zumindest in ihrem breiten Abschnitt 25 mit einer Blendenschicht, insbesondere Metallisierung, (o. Abb.) ausgerüstet sein.The LED cover 22 can also be equipped with an aperture layer, in particular metallization (not shown), at least in its broad section 25.

Fig.3 zeigt in einer zu Fig.2 analogen Darstellung einen Ausschnitt einer LED-Röhrenlampe 31 gemäß einer dritten Ausführungsform, wobei die Position des Ausschnitts analog zu dem in Fig.2 gestrichelt eingezeichneten Kreis liegt. Der Ausschnitt zeigt insbesondere einen Stoßbereich 33 einer LED-Abdeckung 32. Figure 3 shows in one too Fig.2 analogous representation of a section of an LED tube lamp 31 according to a third embodiment, wherein the position of the section analogous to that in Fig.2 dashed circle is located. The detail shows in particular a joint region 33 of an LED cover 32.

Die LED-Röhrenlampe 31 ist zumindest ähnlich zu der Röhrenlampe 21 aufgebaut, außer dass der schmale Abschnitt 34 und der breite Abschnitt 35 in dem Stoßbereich 33 fest miteinander verbunden sind. Dadurch kann die Montageausnehmung 26 entfallen. Die feste Verbindung kann beispielsweise durch ein Kunststofflaserschweißverfahren bewerkstelligt werden. Dazu ist der schmale Abschnitt 34 so schmal, dass er sich vollständig in dem Boden der Aussparung 4 des Kühlkörpers 2 befindet, vorzugsweise so, dass sein freier Rand an den abgestuften Rand 13 der Aussparung 4 stößt, so dass eine genaue Positionierung des freien Rands und damit der LED-Abdeckung 32 besonders einfach durchgeführt werden kann. Dadurch liegt der schmale Abschnitt 34 flach auf dem Boden der Aussparung 4 auf, so dass der freie seitliche Rand des breiten Abschnitts 35 einfach ebenfalls in der Aussparung 4 oberhalb des schmalen Abschnitts 24 aufgesetzt werden kann, wobei der abgestufte Rand 13 als ein seitlicher Anschlag dient. Durch ein leichtes Herunterdrücken des breiten Abschnitts 35 bildet sich ein zumindest linienförmiger, vorzugsweise breiter Stoßbereich oder Kontaktbereich, welcher durch einen Laserstrahl L zum Verschweißen der beiden Abschnitte 34, 35 einfach erreichbar ist. Auch dieses Verfahren lässt sich besonders einfach durchführen und ergibt auch den Vorteil, dass das Schweißverfahren eine normtechnisch elektrisch dichte Verbindung bildet.The LED tube lamp 31 is at least similar to the tube lamp 21 except that the narrow portion 34 and the wide portion 35 are fixedly connected to each other in the butting region 33. As a result, the mounting recess 26 can be omitted. The solid compound can be accomplished, for example, by a plastic laser welding process. For this purpose, the narrow portion 34 is so narrow that it is completely in the bottom of the recess 4 of the heat sink 2, preferably so that its free edge abuts the stepped edge 13 of the recess 4, so that an accurate positioning of the free edge and so that the LED cover 32 can be carried out particularly easily. As a result, the narrow portion 34 lies flat on the bottom of the recess 4, so that the free lateral edge of the wide portion 35 can also be easily placed in the recess 4 above the narrow portion 24, wherein the stepped edge 13 serves as a lateral stop , By a slight depression of the wide portion 35, an at least line-shaped, preferably broad impact area or contact area is formed, which is easily accessible by a laser beam L for welding the two sections 34, 35. This method is also particularly easy to perform and also gives the advantage that the welding process forms a standard electrically sealed connection.

Selbstverständlich ist die vorliegende Erfindung nicht auf die gezeigten Ausführungsbeispiele beschränkt.Of course, the present invention is not limited to the embodiments shown.

So ist die LED-Leuchtvorrichtung nicht auf eine Verwendung mit LED-Röhrenlampen beschränkt. Es können vielmehr auch anders ausgestaltete LED-Lampen die beschriebene Erfindung nutzen bzw. damit aufgebaut sein. Darüber hinaus ist die Erfindung nicht auf eine Verwendung mit einer Lampe beschränkt, sondern kann beispielsweise auch LED-Module und LED-Leuchten umfassen. Beispielsweise kann der Kühlkörper anstelle des gezeigten dedizierten Kühlkörpers einer LED-Röhrenlampe auch ein Teil einer LED-Leuchte sein, dies kann insbesondere bedeuten, dass sich die LEDs 7 nicht einfach standardisiert austauschen lassen, was jedoch in Anbetracht der hohen Lebensdauern der LEDs 7 kein wesentliches Problem sein mag. Beispielsweise mag die Leuchte eine Tischleuchte, Wandleuchte oder Pultleuchte sein, welche ebenfalls eine zylindrische Grundform aufweisen können.Thus, the LED lighting device is not limited to use with LED tube lamps. Rather, differently designed LED lamps can use the described invention or be constructed therewith. Moreover, the invention is not limited to use with a lamp, but may include, for example, LED modules and LED lights. For example, instead of the shown dedicated heat sink of an LED tube lamp, the heat sink may also be a part of an LED light; this may mean, in particular, that the LEDs 7 can not be exchanged in a standardized manner, which, however, is not essential in view of the high lifetimes of the LEDs 7 Problem may be. For example, the lamp may be a table lamp, wall lamp or desk lamp, which may also have a cylindrical basic shape.

Allgemein ist die Erfindung nicht auf längliche, z.B. zylinderförmige, Leuchtvorrichtungen beschränkt, sondern kann auch jede andere Form annehmen, z.B. mit rotationssymmetrischen Abdeckungen, solange nur die doppelte Abdeckung mit der LED-Abdeckung und der Schutzabdeckung über den LEDs umsetzbar ist.Generally, the invention is not intended to be elongate, e.g. cylindrical, lighting devices limited, but may also take any other form, e.g. with rotationally symmetrical covers, as long as only the double cover with the LED cover and the protective cover over the LEDs can be implemented.

Das Material der LED-Abdeckung kann z.B. PC, ABS und/oder PMMA aufweisen.The material of the LED cover can have, for example, PC, ABS and / or PMMA.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
LED-RöhrenlampeLED tube lamp
22
Kühlkörperheatsink
33
Oberseite des KühlkörpersTop of the heat sink
44
Aussparungrecess
55
LED-TrägerLED support
66
Vorderseite des LED-TrägersFront of the LED carrier
77
LEDLED
88th
Leiterbahnconductor path
99
LeiterbahnabdeckungConductor path cover
1010
Rückseite des LED-TrägersRear of the LED carrier
1111
WärmeleitkleberThermal Adhesive
1212
LED-AbdeckungLED cover
1313
abgestufter Rand der Aussparungstepped edge of the recess
1414
Blendenschichtaperture layer
1515
Fensterwindow
1616
Schutzabdeckungprotective cover
1717
Klebewulstadhesive bead
2121
LED-RöhrenlampeLED tube lamp
2222
LED-AbdeckungLED cover
2323
Stoßbereichjoint area
2424
schmaler Abschnitt der LED-Abdeckungnarrow section of the LED cover
2525
breiter Abschnitt der LED-Abdeckungwide section of the LED cover
2626
Montageausnehmungmounting recess
2727
Zwischenlageliner
3131
LED-RöhrenlampeLED tube lamp
3232
LED-AbdeckungLED cover
3333
Stoßbereichjoint area
3434
schmaler Abschnitt der LED-Abdeckungnarrow section of the LED cover
3535
breiter Abschnitt der LED-Abdeckungwide section of the LED cover
dd
Schichtdickelayer thickness
KK
Kriechstreckecreepage
LL
Laserstrahllaser beam

Claims (13)

  1. LED lighting device (1; 21; 31) comprising
    - an LED carrier (5) which is fitted with at least one LED (7) on its front side (6) and is secured to a support (2) by its rear side (10),
    - the front side (6) of the LED carrier (5) being covered in an arched manner by an electrically insulating, light-permeable and diffusely scattering LED cover (12; 22; 32) and
    - the LED cover (12; 22; 32) being covered in an arched manner by a protective cover (16) sitting on the support (2),
    characterized in that
    - the LED cover (22; 32) also forms an intermediate layer (27) between the rear side of the LED carrier (5) and the support (2).
  2. LED lighting device (21; 31) according to Claim 1, wherein the LED cover (22; 32) is present in the form of a flexible sheet rolled together.
  3. LED lighting device (31) according to Claim 2, wherein the rolled-together LED cover (22; 32) is firmly connected, in particular welded, in the joint area thereof (23; 33).
  4. LED lighting device (21) according to one of the preceding claims, wherein the support (2) has at least one mounting recess (26) to receive part of the LED cover (22, 25; 32, 35).
  5. LED lighting device (1) according to Claim 1, wherein the LED cover (12) has a non-closed contour or shape and is fixed to the support (2) by at least one part of its free edges.
  6. LED lighting device (1) according to one of the preceding claims, wherein conductor tracks (8) present at least on a front side (6) of the LED carrier (5) are covered directly by means of a conductor track cover (9).
  7. LED lighting device (1) according to Claim 6, wherein the conductor track cover (9) consists of glass.
  8. LED lighting device (1) according to either of Claims 6 and 7, wherein the conductor track cover (9) covers substantially the whole of the front side (6) of the LED carrier (5) outside the LEDs (7).
  9. LED lighting device (1) according to one of the preceding claims, wherein there is a thermally conductive heat-conducting material (11), in particular heat-conducting adhesive, between the rear side (10) of the LED carrier (5) and the support (2).
  10. LED lighting device (1; 21; 31) according to one of Claims 6 to 9, wherein the LED carrier (5) has a base body made of an electrically insulating ceramic.
  11. LED lighting device (1; 21; 31) according to one of the preceding claims, wherein the support (2) has at least one cut-out (4) with a stepped edge (13) for the insertion of the LED carrier (5) and the LED cover (12; 22; 32).
  12. LED lighting device (1; 21; 31) according to one of the preceding claims, wherein the LED lighting device (1; 21; 31) is an LED retrofit strip-lamp and the support (2) is a heat sink.
  13. Method for producing an LED lighting device (21; 31) according to one of Claims 1 to 5, wherein the method comprises at least the following steps:
    - applying a section of the LED cover (22; 32) to the support (2);
    - laying and fixing the LED carrier (5) on this section of the LED cover (22; 32);
    - turning the section (25; 35) of the LED cover (22; 32) that is not resting on the support (2) over the LED carrier (5), so that this section (25; 35) arches over the LED carrier (5); and
    - fixing the turned-over section (25; 35) such that the LED cover (22; 32) is present in a rolled-together form.
EP11741532.3A 2010-07-02 2011-06-22 Led-lighting device and method for producing an led lighting device Not-in-force EP2521876B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010030863A DE102010030863A1 (en) 2010-07-02 2010-07-02 LED lighting device and method for producing an LED lighting device
PCT/EP2011/060414 WO2012000860A1 (en) 2010-07-02 2011-06-22 Led-lighting device and method for producing an led lighting device

Publications (2)

Publication Number Publication Date
EP2521876A1 EP2521876A1 (en) 2012-11-14
EP2521876B1 true EP2521876B1 (en) 2016-02-24

Family

ID=44630007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11741532.3A Not-in-force EP2521876B1 (en) 2010-07-02 2011-06-22 Led-lighting device and method for producing an led lighting device

Country Status (5)

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US (1) US8919992B2 (en)
EP (1) EP2521876B1 (en)
CN (1) CN102971576B (en)
DE (1) DE102010030863A1 (en)
WO (1) WO2012000860A1 (en)

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WO2012000860A1 (en) 2012-01-05
CN102971576B (en) 2015-11-25
EP2521876A1 (en) 2012-11-14
DE102010030863A1 (en) 2012-01-05
CN102971576A (en) 2013-03-13
US8919992B2 (en) 2014-12-30
US20130094200A1 (en) 2013-04-18

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