EP2250428B1 - Lighting module, lamp and lighting method - Google Patents

Lighting module, lamp and lighting method Download PDF

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Publication number
EP2250428B1
EP2250428B1 EP09708178.0A EP09708178A EP2250428B1 EP 2250428 B1 EP2250428 B1 EP 2250428B1 EP 09708178 A EP09708178 A EP 09708178A EP 2250428 B1 EP2250428 B1 EP 2250428B1
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EP
European Patent Office
Prior art keywords
light
light source
optical component
lighting module
reflector
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.)
Active
Application number
EP09708178.0A
Other languages
German (de)
French (fr)
Other versions
EP2250428A1 (en
Inventor
Monika PAHLKE
Katrin Schroll
Hartmut Billy
Julius Augustin Muschaweck
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 Opto Semiconductors GmbH
Osram GmbH
Original Assignee
Osram Opto Semiconductors GmbH
Osram GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE102008007723A priority Critical patent/DE102008007723A1/en
Application filed by Osram Opto Semiconductors GmbH, Osram GmbH filed Critical Osram Opto Semiconductors GmbH
Priority to PCT/EP2009/000849 priority patent/WO2009098081A1/en
Publication of EP2250428A1 publication Critical patent/EP2250428A1/en
Application granted granted Critical
Publication of EP2250428B1 publication Critical patent/EP2250428B1/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02Combinations of only two kinds of elements
    • F21V13/04Combinations of only two kinds of elements the elements being reflectors and refractors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00Fastening of light sources or lamp holders
    • F21V19/0005Fastening of light sources or lamp holders of sources having contact pins, wires or blades, e.g. pinch sealed lamp
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/04Refractors for light sources of lens shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/09Optical design with a combination of different curvatures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10Outdoor lighting
    • F21W2131/103Outdoor lighting of streets or roads
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00Planar light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00Planar light sources
    • F21Y2105/10Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • F21Y2115/15Organic light-emitting diodes [OLED]

Description

  • The invention relates to a lighting module with a light source, an optical component and a reflector, a luminaire with such a lighting module as well as a lighting method.
  • Up to now, a narrow emission characteristic or a radiation characteristic with sharp light / dark transitions in a lighting module requires a great deal of technical effort and entails high efficiency losses. Often, poor thermal management results from forced tight placement of LED modules, extremely dense chip packaging, and / or a small gap between the primary light source (LED chip or lamp) and a downstream lens.
  • In order to achieve a wide-angle radiation characteristic in an illumination module, a combination of lenses with different emission characteristics or / and a combination of different optical axes of similar optics (tilting of the optics to each other) is known. Narrow beam angles have hitherto been realized with conventional lenses of low efficiency.
  • Out US 2006/0152820 A1 For example, a light-emitting device is known which has a light-emitting component and a lens. The lens has a bottom surface, a first reflective surface, a second reflective surface, and a refractive surface such that the light that falls into the lens through the bottom surface and that directly strikes the first reflective surface is from the first reflective surface is reflected onto the second reflective surface, then from the second reflective surface to the refractive surface Surface is reflected and then refracted from the refractive surface of the lens to exit. Light incident on the lens through the lower surface and directly on the second reflective surface is reflected by the second reflective surface onto the refractive surface and then refracted by the refractive surface of the lens to exit the lens.
  • It is the object of the present invention to provide a simple and inexpensive way of achieving a broad emission characteristic in a lighting module.
  • This object is achieved by means of a lighting module according to claim 1 and by means of a luminaire according to claim 14. Advantageous embodiments are in particular the dependent claims.
  • The illumination module has at least one light source, at least one optical component arranged at a distance from the at least one light source, and at least one reflector. The optical component is designed and arranged to have a wide-emitting radiation characteristic and to direct a predominant part of the light incident on the optical component from the light source onto the reflector, the proportion being at least 30%. The illumination module furthermore has a plurality of sets of in each case at least one light source and one downstream optical component, wherein the multiple sets are followed by a common reflector, and wherein the optical components are lenses with a different orientation.
  • Wide beam means that the optical component is designed and arranged so that the maximum light intensity is not on its optical axis or main beam direction; on such an optical component incident light, z. B. a Lambertian radiator, so is mostly under emitted at a certain angle (wide-angle) to the optical axis of the optical component.
  • The light preferably comprises visible light, especially white or colored light, but may alternatively or additionally be e.g. B. IR light and / or UV light include.
  • It should be generally understood that when referring to a number of elements, e.g. For example, "a", "one", etc., and the majority of which may be meant, unless specifically stated otherwise.
  • This device is capable of producing sharp images, e.g. B. with a sharp light / dark boundary, at the same time to achieve a very compact and bright radiant structure. This is achieved, inter alia, that the law between image sharpness and dimensioning of pure lens systems (etendue) can be circumvented by using the reflector. At the same time this is due to the spacing The optics of the light source ensure that the optics are not damaged by too high a luminous flux density or temperature. Damage caused by the incident light can be considerable, in particular for plastic optical components, since they can be clouded by the incidence of light and thus reduce the life of the module. Also, the spacing allows easy scalability of the system, e.g. B. to adapt to a different number of light sources. In particular, sharp light / dark transitions in the target area are z. B. in signaling, street lighting, automotive lighting, business lighting (so-called. 'Shoplighting'), architectural lighting, etc. can be used advantageously.
  • In order to obtain a high brightness, in particular with a simultaneously sharp light / dark boundary, it is preferred if the optical component is designed and arranged to direct a predominant part of the light incident from the light source onto the reflector. Under a predominant part of a luminous flux of over 50% of the total incident on the optical component luminous flux is understood.
  • It is particularly preferred for this purpose if at least 60%, particularly preferably at least 70%, of the light incident on the optics from the light source is directed onto the reflector. The remaining portion is then typically emitted directly from the optics of the module.
  • It is preferred if at least 90%, more preferably more than 95%, of the amount of light emitted by the at least one light source falls on the optical component. The remaining portion can - preferably - fall directly onto the reflector or can be emitted directly to the outside.
  • Also preferred is an illumination module in which the optical component is configured and arranged to have light along an optical axis of not more than 30%, in particular not more than 20%, to radiate a maximum light intensity (height of the light intensity maximum).
  • The light sources may be formed as separately shaped and controlled light sources or groups of such light sources. It is preferred if at least one light source, preferably a plurality of light sources, is applied to at least one carrier element; As a result, the illuminance is scalable and, when several light sources are combined in a group, a particularly compact design is achieved.
  • Preferably, the carrier element has a plurality of light sources in a, in particular rectangular (matrix-like) group of light sources combined, for. B. in the matrix arrangement 1x2, 1x3, 2x2, 2x3, 3x3, etc. Such an arrangement makes it possible to install a high light output in a small space.
  • An illumination module may be preferred in which the multiple light sources emit the same color, in particular white.
  • An illumination module may be preferred in which at least two light sources radiate to one another in different colors, in particular if the light sources produce a white mixed light. Thus, light sources in a combination of RGB (eg, RGB, RGGB, RRGB, RGBB, etc.) or, in addition, to produce a 'warm' white, can be used with a yellow ('amber') hue. For six light sources z. B. the combination RGGBAA be preferred.
  • It is particularly preferred if the light source (s) as light emitting diode (s), LED (s), is executed or are. The type of LED is not limited and may include, for example, inorganic LEDs or organic LEDs (OLEDs). Preferred is a use of surface mounted LEDs ("Surface Mounted LEDs") or chip arrays based on chip-on-board or similar technologies.
  • Alternatively to the use of LEDs z. As well as laser diodes or other compact light sources used.
  • To reduce thermal stress and radiation exposure, an illumination module is preferred in which a light entry surface of the optical component facing the light source (s) is arranged at a distance of at least 2.5 mm, preferably of at least 5 mm, to a surface of the light source. As the distance increases, the load on the optical component continues to decrease, so a distance of more than 5 mm is preferable to shorter distances.
  • Also preferred is an illumination module in which a light entry surface of the optical component facing the light source is arranged at a distance from a surface of the light source having at least the maximum linear dimension, in particular at least twice the maximum linear dimension, the light source and / or the group of Light sources corresponds. The maximum linear dimension is the maximum distance between two points located on the outer contour of the LED or the group of LEDs. The inventive arrangement, regardless of the absolute size of the LED, a sufficient distance between the lens and LED is also achieved to ensure the function of the lens even in long-term operation.
  • Furthermore, a lighting module in which a light entry surface of the optical component facing the light source is arranged at a distance from a surface of the LED which is at least one quarter of a diameter of the light entry surface of the optical component, in particular at least one third of the diameter of the light entry surface is preferred of the optical component corresponds. This also ensures that the thermal stress of the lens is reliably reduced regardless of their absolute size and no heat build-up between the LED and the lens.
  • An illumination module is furthermore preferred in which the light entry surface of the optical component facing the light source is arranged at a distance of at most 30 mm, preferably of at most 20 mm, from the surface of the light source. This ensures that the radiation emitted by the LED reaches the lens with as little loss as possible, and that a compact arrangement is achieved.
  • In addition, a lighting module in which the facing light entry surface of the optical component is arranged at a distance from the surface of the light source, which is at most eight times the maximum linear dimension, preferably at most five times the maximum linear dimension, the light source and / or Group of light source corresponds. This also ensures that, regardless of the absolute size of the LED or the group of LEDs, the radiation emitted by the LED arrives in sufficient concentration at the lens and a compact design is achieved.
  • Also preferred is an illumination module in which a light entry surface of the optical component facing the light source is arranged at a distance from the surface of the LED that corresponds at most to one and a half times the diameter of the light entry surface of the optical component, in particular at most the diameter of the light entry surface of the optical component. This also ensures a compact design with good light output.
  • At a distance, both a distance along certain axis, z. B. a coordinate axis, (height distance) to be meant, or - preferably - the shortest distance between a radiating surface of a light source and the light entry surface of the optical component. The coordinate axis is then preferably that axis which indicates a mounting position between light sources and optical component.
  • The optical component is generally an optical component that has a wide-angle characteristic, in particular, a light-transmitting optical component such as a lens or a diffraction grating, but may also be configured as a non-light-transmissive optical component such as a reflector. There are also combinations with several, any such optical components possible.
  • Particularly preferred is a lighting module in which the optical component comprises at least one lens. In particular, a lens arrangement with minimized total reflection is made possible, which causes a lower sensitivity of the optics to manufacturing tolerances and misalignment due to the low total reflection.
  • A lighting module in which at least one surface of the lens has an aspherical shape may be preferred.
  • A lighting module in which at least one surface of the lens has a rotationally symmetrical shape may also be preferred.
  • Furthermore, a lighting module in which at least one surface of the lens has an elliptical freeform ('spline') may be preferred.
  • Furthermore, a lighting module may be preferred in which a light entry surface of the lens has a concave recess ('dome').
  • As an optical component, however, the use of a diffraction grating may also be preferred.
  • The optical component may also have a reflective surface, e.g. As an upside-down, cone-shaped reflector include.
  • It may be advantageous for simple and inexpensive production, if the optical component is formed of a transparent polymer as the base material. Polymer materials enable simple and cost-effective shaping, even with complex shapes, with the advantages of the invention having a particularly pronounced effect on these lenses. However, an optical component made of glass may also be preferred. There are also combinations of several optical components with plastic and / or glass possible.
  • In general, a single optical component can be used, or several cooperating optical components can be used to obtain the wide-angle radiation characteristic.
  • The reflector is preferably located in a beam path of a light intensity maximum.
  • It is preferred for obtaining a high luminous efficacy when the reflector surrounds the light source (s), in particular the light source (s) and optics (s), on all sides perpendicular to the optical axis or main emission direction. As a result, the light output and the efficiency are increased, since any light emitted to the side can be concentrated in the direction of the lens or the emission direction.
  • For easy generation of a desired Abstrahlgeometrie and high illuminance, a lighting module is preferred in which at least one reflection (part) surface or sector, z. B. has a side surface, at least two facets.
  • It is advantageous if at least one sector of the reflector has at least 6, preferably between 8 and 20, in particular 10, facets. The faceting causes a homogenization of the illuminance and color distribution, since the images of different areas of an LED chip or different LED of a group of LEDs can overlap.
  • In particular, in order to obtain a sharp light / dark boundary with largely homogeneous illumination of a target surface, it is preferred if at least one reflection surface or a sector of the reflector is provided with facets, that of individual facets, in particular all facets, reflected light bundles largely overlap the target field or a sub-zone thereof. As a result, the desired target field or certain sectors thereof are preferably completely covered by a plurality of light beams emitted by the facets. Thus, not only a plurality of not completely overlapping light cones is blasted into the target field, whereby the effect of manufacturing tolerances and beam transitions is largely excluded.
  • Particularly advantageous, especially for the illumination of rectangular target areas, it is when the reflector has a rectangular in plan view basic shape in which the two shorter reflector sides have no more facets and the two longer reflector sides each having a plurality of facets.
  • It can be advantageous if a reflection surface of the reflector has a cross-sectionally elliptical or parabolic basic shape, with or without introduced facets.
  • Furthermore, it is advantageous if the reflector is essentially formed from a thermally highly conductive base material, in particular aluminum. This allows the reflector in addition to the heat dissipation of the light source (s) can be used.
  • It may be advantageous if the illumination module and / or the optical component has a rotationally symmetrical illumination pattern.
  • However, it can also be advantageous to have a lighting module which has a mirror-symmetrical illumination pattern.
  • However, it can also be advantageous to have a lighting module which has an asymmetrical illumination pattern.
  • Particularly preferred is a lighting module, which has a carrier element with one or more light sources, an optical component and a reflector. Alternatively, however, the illumination module can alternatively also have a plurality of carrier elements, each having one or more light sources and a plurality of optical components, eg. B. summarized to several - in particular, but not necessarily substantially identical - groups of support element (s) and optics (s).
  • The luminaire has at least one illumination module as described above, in particular a plurality of illumination modules. This lamp has the advantage that it can be built easily and without complicated setting. It is particularly advantageous that a planar arrangement of the lighting modules is also possible for a cylindrical image, whereby the heat or thermal management is simplified and a higher design freedom in the luminaire housing is made possible.
  • Particularly preferred is a lamp, the plurality of lighting modules in a matrix arrangement, for. B. a linear (1xn) or rectangular (nxm with n, m> 1) arrangement has. However, the arrangement of the modules is generally arbitrarily configurable, for. B. also circular, elliptical or irregular. The same or differently designed modules can be used together.
  • The lamp, especially with a sharp light / dark characteristic, is particularly preferably used as a lamp for spot lighting, signal lighting or street lighting.
  • In the illumination method, a predominant part of a light emitted by at least one light source onto an optic arranged at a distance from it is directed onto a reflector, wherein the light emitted by the optic has a broad-emission radiation characteristic.
  • In the following figures, the invention is illustrated schematically by means of exemplary embodiments. The same or equivalent elements may be provided with the same reference numerals for the sake of clarity.
  • FIG. 1
    shows in perspective view a lighting device;
    FIG. 2
    shows the lighting device FIG. 1 as a sectional view;
    FIG. 3
    show a plot of a light intensity peak normalized light intensity distribution in a polar diagram for a wide-angle lens;
    FIG. 4
    shows a magnifying section FIG. 2 ;
    FIG. 5
    shows in plan another embodiment of a lighting device.
  • FIG. 1 shows a lighting module 1, which is a combination of at least one light source (not shown) and one of these light source spaced downstream optical Has component in the form of a lens 2. Furthermore, the lighting device 1 has a reflector 3 arranged downstream of the lens 2, and furthermore a bonding board 4 for fastening the light source and a motherboard 5 for fastening the lens 2, the reflector 3 and the bonding board 4. In this case, downstream of at least one part of the from the (at least one) light source emitted light directly or indirectly incident on the lens 2 and incident from the lens 2 on the reflector 3. The lens 2 and the reflector 3 are thus arranged at least partially connected in series in the beam path of the light emitted by the at least one light source.
  • The lens 2 is designed and arranged so that it has a wide-angle radiation characteristic and a predominant part (> 50%) of the light incident from the light source to the reflector 3 directs. This means here that the light intensity maximum is not on the optical axis O of the lens 2 or the lens 2 in combination with the light source. One possible radiation pattern of a wide-beam LED lens system is in FIG. 3 more detailed. In particular, light lobes with light intensity maxima fall on the reflector 3. Only a minor part (<50%) of the light incident on the lens 2 is emitted directly from the illumination module 1.
  • In this embodiment, the reflector 3 or its reflection surface is equipped on two opposite, long sides with reflector sections (facets) 3 a extending in the width direction (x direction), which adjoin one another in the height direction (z direction) and each have a concave surface shape , Each of the 10 reflector sections 3a, of which only three 3a-1,3a-9,3a-10 are provided with reference numerals for reasons of clarity, is inclined relative to the other reflector sections 3a about the x-axis. The shorter reflector sides are provided with a smooth surface without facets. The shape of the reflector 3 is not symmetrical with respect to the (x, z) plane, but the reflector 3 is inclined to one side, so that a main radiation direction of the illumination module 1 is inclined with respect to the optical axis O. The reflector 3 is made of an aluminum alloy, whereby it can be used for heat dissipation from the light source. On the inside (reflection surface) it is provided with a suitable reflective coating.
  • By using this lighting module 1, a highly homogeneous illuminated target field can be achieved in a compact and easy to manufacture manner, which also allows a high marginal sharpness between different lighting areas or the non-illuminated area (light / dark boundary). In particular, the law between image sharpness and dimensioning of pure lens systems (etendue) can be circumvented by using the reflector 3. Sharp light / dark transitions in the target area are particularly desired in the areas of signaling technology, street lighting, automotive lighting, commercial lighting and architectural lighting.
  • For ease of mounting bores 6 are on the motherboard for the implementation of fasteners, z. As screws provided.
  • FIG. 2 shows the lighting device 1 from FIG. 1 as a sectional view through the center of the lens 2 in a sectional plane parallel to the (y, z) plane. The two longitudinal walls of the reflector 3, which expand in the x-direction, are not symmetrically shaped or arranged with respect to the optical axis O by the lens 2. Rather, one of the walls (in this illustration, the left wall) of the reflector 3 is more angled from the optical axis O, thus has in this respect a further opening, while the other side (here: the right side) of the reflector 3 closer to the optical Axis O is arranged and thus a generally lower Opening angle with this includes. As a result, light emitted by the lens 2 is radiated primarily to the left. As a result of the fact that the lens 2 radiates a large part of the light incident on it from the light source 7, a large part of the light emitted by the light source 6 also falls on the reflector 3, as with reference to FIG FIG. 4 will be described in more detail. Due to the structuring 3a of the reflector surface, the partial light bundles of the individual facets 3a (which are provided here with reference symbols only for the left reflector side, and only partially there) are largely superimposed, whereby the illuminance and color on the target surface are homogenized.
  • FIG. 3 FIG. 12 shows a plot of a luminous intensity distribution normalized to a maximum luminous intensity at an angle φ = 70 ° (corresponding to an aperture angle of the lens of 140 °) in a polar diagram for a possible wide-angle lens which is illuminated by a set of six surface-mounted LEDs.
  • As such, the LED light sources used as such (eg, an LED chip) typically have a substantially Lambertian radiation characteristic. Only through the downstream lens, the wide-angle radiation characteristic is achieved. In the arrangement shown, the light intensity in the direction of the optical axis is only about 25% of the light intensity maximum. Thus occurs in a light emission substantially only at a considerable angle relative to the optical axis (0 °), namely between about 35 ° and 80 °, especially between 50 ° and 80 °. However, the opening angle can also be made larger or smaller. Also, the opening angle need not be symmetrical to the optical axis of the light source (s). Furthermore, the opening angle may vary in the circumferential direction, z. B. the type 120 ° x 80 °.
  • FIG. 4 shows a magnifying section FIG. 2 in the region of the lens 2, which is made of a transparent polymer material according to the prior art. The lens 2 is inserted by means of integrally molded legs 8 for connection to the motherboard 5 in corresponding recesses or holes 9 of the motherboard 5. The six light sources 7, of which two are drawn here, are surface-mounted, white-emitting LEDs on a carrier element 10. The carrier element 10 is designed in particular as a printed circuit board on which the six LEDs 7 are arranged in two rows of three rectangular individual LED chips 7 (2x3 matrix arrangement), so that a rectangular overall arrangement with an edge length of about 3 mm in the longitudinal direction and about 2 mm in the transverse direction. The carrier element 10 is mounted on the bonding board 4, which in turn is connected by means of a screw 11 to the motherboard.
  • The LEDs 7 emit their light predominantly on the underside of the lens 2 (light entrance surface). Only a small proportion <5% is radiated directly onto the reflector 3 under the lens 2. The light entrance surface of the lens 2 has a concave, z. B. parabolic or elliptical, molded cavity or recess ('dome') 12 on. In the embodiment shown here, the light entry surface essentially corresponds to the surface of the dome 12. From the light entry surface or the dome 12, the light beams are guided by the lens 2 to its upper surface, from which they are radiated wide. This lens 2 ensures that approximately 70% of the power radiated by the light sources 7 are applied to the reflector 3. Merely for the sake of clarity, the electrical lines and possibly electronics required for the operation of the lighting device are not shown here.
  • The lens 2 is arranged in particular at a distance of approximately 8 mm from the group of light-emitting diodes 7. The distance the lens 2 of the group of LEDs 7 is thus more than twice the maximum linear dimension of the group of LEDs 7, in this case the diagonal of the rectangular array of approximately 3.6 mm. Too large a distance of the lens 2 from the LEDs 7 should be avoided, since so that the thermal load of the lens 2 continues to decrease, but then the arrangement is very large. A maximum distance of 20 mm or approximately 5 times the maximum linear extent of the group of LEDs 7 has proven to be useful in the components commonly used.
  • The lens 2 has a diameter of approximately 17 mm. The radiation entrance surface 12 of the lens 2 is thus arranged at a distance from the surface of the LEDs 7, which corresponds to more than one third of the diameter of the radiation entrance surface of the lens 2, in the present example, even approximately half. Too large a distance of lens 2 and LEDs 7 would require a very large lens diameter to capture an equal proportion of the emitted light with the lens 2 as in a nearer to the LED 7 lens 2. However, this increases the manufacturing effort and Module 1 gets very big and unwieldy. It has proved to be advantageous to choose the distance from the radiation entrance surface of the lens 2 and LED 2 smaller than the lens diameter.
  • The outer annular beveled side surface 13 of the lens 2 is designed so that a minimized total reflection of the lens 2 results, which in turn leads to a lower sensitivity of the lens 2 to manufacturing tolerances and a misalignment.
  • In this FIG. 4 corresponds to the mentioned distance the shortest distance of an LED 7 to the lens. 2
  • FIG. 5 shows in plan a simplified representation of a further embodiment of a lighting device 14, in which now three sets of light source (s) and associated wide-angle lens 15 are arranged on a motherboard 5 and surrounded by a common reflector 3. Each set with a combination of one or more light sources and common wide-beam optical system 15 has the same basic components, for example the now elliptical lens 15, but here the orientation of the lenses 15 in the (x, y) plane is different. Thus, two adjacent lenses 15 are offset in the x, y plane by 45 ° to each other. Also it is possible if in this FIG. 5 also not explicitly shown that the optical axes of the lenses 15 are angularly offset from each other, in this embodiment, for example, with respect to the z-axis, so that, for example, the top set with its combination of light source (s) and lens 15 at a certain angle with respect to the x -Axis is inclined, the optical axis of the middle set coincides with the z-axis and the optical axis of the lower set is inclined by the same angle as that of the upper set against the z-axis, but in another direction, here for example in the opposite direction.
  • Of course, the present invention is not limited to the embodiments shown.
  • Thus, instead of using light-emitting diodes or LED chips as light sources, any other suitable light source can be used, for. B. a laser diode.
  • If light-emitting diodes are used, it is possible to use inorganic light-emitting diodes based on InGaAlP or AlInGaP or InGaN, but also AlGaAs, GaAlAs, GaAsP, GaP, SiC, ZnSe, InGaN / GaN, CuPb, etc., or, for example, also OLEDs. Particularly advantageous is the use of ThinGaN technology. Also, various types of construction can be used, such as surface-mounted LEDs.
  • It can be used the same color radiating light sources. Such same-colored light sources may be multi-chrome or monochrome radiating light sources. As the same color multichrome radiating light sources in particular white light sources are used, for example, blue and phosphor provided with LEDs, in which the phosphorus wavelengths a portion of the light emitted by the LED blue light in yellow light, resulting in a total white mixed light. Alternatively, the use of UV LEDs in conjunction with wavelength conversion material is conceivable, which converts the UV light of the LEDs as completely as possible into visible light, in particular white light. However, other color combinations are possible, especially for producing a white light. In particular, "hard" or "soft" white can be produced as white light.
  • As a light source, a single light source or a combination of multiple light sources is conceivable, for example, a cluster of multiple light sources, eg. B. LED chips. The associated light sources of the cluster, in particular LED clusters, can be different colors to one another and result in a white light in color mixing. In particular, an LED cluster of red, green and blue radiating individual light sources (RGB) is conceivable. One or more LEDs can be used per color, eg. B. depending on the desired color intensity. Also, light sources, especially LEDs, other color can be added, for. B. yellow or amber LEDs. The light intensity of the light sources is preferably adjustable, z. B. dimmable, z. B. via a regulation of the light sources supplied current.
  • As a wide-emitting radiation characteristic enabling optics, in particular a lens can be used, for. An AR-GUS lens. It is possible to enable a broad emission characteristic but also combinations of multiple lenses, even if this is for reasons of cost and simple assembly is not preferred. Overall, it is possible to make a smaller part of the broadly emitted light not reflect from the reflector.
  • In general, the wide-beam combination of light source (s), optics and optionally reflector can enable rotationally symmetrical, mirror-symmetrical and / or asymmetrical light distribution patterns.
  • In general, the reflection surface of the reflector may be structured or not structured. As structuring, in particular different facet regions can be provided on the reflection surface, which, in addition to being elongated, also have, for example, a shape which is limited in both dimensions, for example. B. a square or rectangular shape.
  • In general, it is also possible to provide a plurality of sets, each with a wide-beam combination of light source (s) and optics, which may have a common reflector or reflection region. The optical axes of the respective sets may be offset and / or tilted relative to each other. It is also possible that the shape of the radiation pattern and / or its dimension differs among different sets. An arrangement of the sets in a row or in any surface pattern, for example a rotationally symmetrical surface pattern with or without a central set, is also conceivable.
  • In general, the coupling of several such lighting devices, possibly with other lighting devices to a lamp is possible.
  • LIST OF REFERENCE NUMBERS
  • 1
    lighting module
    2
    lens
    3
    reflector
    4
    Bondingplatine
    5
    motherboard
    6
    execution
    7
    light source
    8th
    leg
    9
    hole
    10
    carrier
    11
    Screw / screw hole
    12
    cathedral
    13
    Total reflection surface
    14
    lighting module
    15
    lens
    H
    mounting distance

Claims (14)

  1. Lighting module (1; 14), comprising at least:
    - a light source (7), in particular light emitting diode,
    - a lens (2; 15) arranged at a distance from the light source (7), and
    - a reflector (3),
    - wherein the lens (2; 15) is configured and arranged to have a wide-angle emission characteristic and to direct a proportion of the light incident from the light source (7) onto the reflector (3), wherein the proportion is at least 30%, characterized in that
    - the lighting module (14) has a plurality of sets each composed of at least one light source (7) and an optical component (15) disposed downstream,
    - wherein a common reflector (3) is disposed downstream of the plurality of sets (7, 15), and
    - wherein the optical components are lenses (15) having different orientations.
  2. Lighting module (1; 14) according to Claim 1, wherein the optical component (2; 15) is configured and arranged to direct a predominant portion of the light incident from the light source (7) onto the reflector (3).
  3. Lighting module (1; 14) according to Claim 1 or 2, wherein the optical component (2; 15) is configured and arranged to direct at least 60%, in particular at least 70%, of the light incident from the light source (7) onto the reflector (3).
  4. Lighting module (1; 14) according to any of the preceding claims, wherein the optical component (2; 15) is configured and arranged to emit light along an optical axis (0) with not more than 30%, in particular not more than 20%, of a maximum light intensity.
  5. Lighting module (1; 14) according to any of the preceding claims, wherein a light entrance surface - facing the light source (7) - of the optical component (2; 15) is arranged at a distance of at least 2.5 mm, preferably of at least 5 mm, from the surface of the light source (7).
  6. Lighting module (1; 14) according to any of the preceding claims, wherein a light entrance surface - facing the light source (7) - of the optical component (2; 15) is arranged at a distance from a surface of the light source (7) which corresponds to at least the maximum linear dimension, in particular to at least twice the maximum linear dimension, of the light source (7) and/or of the group of light sources,
    and/or
    which corresponds to at least one quarter of a diameter of the light entrance surface of the optical component (2; 15), in particular to at least one third of the diameter of the light entrance surface of the optical component (2; 15).
  7. Lighting module (1; 14) according to any of the preceding claims, wherein the light entrance surface - facing the light source (7) - of the optical component (2; 15) is arranged at a shortest distance of at most 30 mm, preferably of at most 20 mm, from the surface of the light source (7).
  8. Lighting module (1; 14) according to any of the preceding claims, wherein the light entrance surface - facing the light source (7) - of the optical component (2; 15) is arranged at a shortest distance from the surface of the light source (7) which corresponds at most to eight times the maximum linear dimension, preferably at most five times the maximum linear dimension, of the light source (7) and/or the group of light source (7),
    and/or
    corresponds at most to one and a half times the diameter of the light entrance surface of the optical component (2; 15), in particular at most to the diameter of the light entrance surface of the optical component (2; 15).
  9. Lighting module (1; 14) according to any of the preceding claims, wherein the optical component comprises a diffraction grating.
  10. Lighting module (1; 14) according to any of the preceding claims, wherein at least one reflection surface of the reflector (3) is structured, in particular faceted; wherein the at least one reflection surface of the reflector (3) is provided with facets (3a) such that light beams reflected from a plurality of, in particular all, facets (3a) completely overlap, and/or
    wherein the reflector (3) has a rectangular basic form in which the two shorter sides have no facets and the two longer sides each have a plurality of facets (3a).
  11. Lighting module (1; 14) according to any of the preceding claims, which has a rotationally symmetrical, a mirror-symmetrical or an asymmetrical light distribution pattern.
  12. Lighting module (14) according to any of the preceding claims, wherein the optical components are lenses (15), the optical axes of which are angularly offset with respect to one another.
  13. Luminaire, comprising at least one lighting module (1; 14), in particular a plurality of lighting modules (1; 14), according to any of the preceding claims.
  14. Luminaire according to Claim 13, which produces a sharp bright/dark boundary in the target region.
EP09708178.0A 2008-02-06 2009-02-06 Lighting module, lamp and lighting method Active EP2250428B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102008007723A DE102008007723A1 (en) 2008-02-06 2008-02-06 Lighting module, luminaire and method for lighting
PCT/EP2009/000849 WO2009098081A1 (en) 2008-02-06 2009-02-06 Lighting module, lamp and lighting method

Publications (2)

Publication Number Publication Date
EP2250428A1 EP2250428A1 (en) 2010-11-17
EP2250428B1 true EP2250428B1 (en) 2014-11-26

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US (1) US8556471B2 (en)
EP (1) EP2250428B1 (en)
KR (1) KR101212911B1 (en)
CN (1) CN101939583B (en)
DE (1) DE102008007723A1 (en)
WO (1) WO2009098081A1 (en)

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Publication number Publication date
KR101212911B1 (en) 2012-12-14
US8556471B2 (en) 2013-10-15
US20110110083A1 (en) 2011-05-12
DE102008007723A1 (en) 2009-08-20
EP2250428A1 (en) 2010-11-17
WO2009098081A1 (en) 2009-08-13
CN101939583A (en) 2011-01-05
CN101939583B (en) 2015-04-08
KR20100116628A (en) 2010-11-01

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