WO2019219289A1 - Élément lumineux et module d'éclairage présentant une faible hauteur de construction - Google Patents

Élément lumineux et module d'éclairage présentant une faible hauteur de construction Download PDF

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Publication number
WO2019219289A1
WO2019219289A1 PCT/EP2019/058342 EP2019058342W WO2019219289A1 WO 2019219289 A1 WO2019219289 A1 WO 2019219289A1 EP 2019058342 W EP2019058342 W EP 2019058342W WO 2019219289 A1 WO2019219289 A1 WO 2019219289A1
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WO
WIPO (PCT)
Prior art keywords
light
mirror
light source
reflector
luminous element
Prior art date
Application number
PCT/EP2019/058342
Other languages
German (de)
English (en)
Inventor
Bernd WÖLFING
Original Assignee
Schott Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schott Ag filed Critical Schott Ag
Publication of WO2019219289A1 publication Critical patent/WO2019219289A1/fr

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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
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/40—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors specially adapted for specific vehicle types
    • B60Q3/41—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors specially adapted for specific vehicle types for mass transit vehicles, e.g. buses
    • B60Q3/43—General lighting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/70—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose
    • B60Q3/74—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps
    • B60Q3/745—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps using lighting panels or mats, e.g. electro-luminescent panels, LED mats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • F21V7/0033—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/05—Optical design plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/06—Optical design with parabolic curvature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D11/00—Passenger or crew accommodation; Flight-deck installations not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D11/00—Passenger or crew accommodation; Flight-deck installations not otherwise provided for
    • B64D2011/0038—Illumination systems for cabins as a whole
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2106/00—Interior vehicle lighting devices
    • 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 generally relates to a luminous element.
  • the invention relates to an elongated
  • Luminous element which is of low height and emits a homogeneous, surface light.
  • the invention further relates to a lighting module, comprising the luminous element.
  • Surface also referred to as surface light
  • a housing also referred to as a light box
  • a light source light is conducted into the interior of the housing and penetrates via at least one of the outer surfaces to the outside.
  • Such surface lights can, for example, as
  • Signboard or advertising medium Other embodiments include a light guide plate in which light is coupled from at least one side.
  • flat luminaires which are to be used not only as a backlight, but directly as a lamp.
  • LEDs light sources
  • the problem here is the one hand to achieve a high degree of homogeneity of the luminous area and the other
  • the lamps also referred to as backlight systems, can comprise a large number of LEDs distributed over the surface.
  • the height of such lighting systems and the number of light sources to be used per area are directly related to each other.
  • a flat lighting can thus be achieved by a variety of checkerboard-like, punctiform light emitting LEDs.
  • Such a lighting system describes about the DE 10 2007 044 566 Al.
  • a general disadvantage of such rear lighting is that the distance between the light sources, especially in a
  • the distance between the LEDs should not be greater than the distance to the diffuser. This means that a large number of LEDs must be provided for large areas.
  • a surface light is also described, for example, in the document DE 10 2011 013 206 A1. At this
  • Area light is provided a light box in which by means of a light source in operation light on a
  • Light mixing chamber is directed.
  • Light guide means required to allow the collimated light to emerge homogeneously from the illumination system. Therefore, it is desirable to have lighting systems which have a low overall height in comparison with a luminous area in order to be used as versatile as possible, for example also in the automotive sector or in the aviation sector, for example for cabin lighting.
  • Luminous element and a lighting module according to one of the independent claims. Preferred embodiments and further developments of the invention are to be taken from the respective subclaims.
  • the invention accordingly provides a luminous element comprising a punctiform light source, a mirror and a reflector.
  • the invention further relates to a lighting module for emitting a homogeneous light from a flat light exit window, comprising a light box with an opening defining a light exit window and at least one luminous element.
  • homogeneous light refers to a surface provided in the perception of a Observers understood the same brightness. This means, in particular, that there are no sudden changes in the brightness that are visible to the naked eye.
  • the rays emitted by the light source can be directed in a desired direction. Accordingly, ask
  • Mirror and reflector is a cooperative system for radiation control.
  • the light source serves to emit electromagnetic radiation, which is advantageous in the visible wavelength range. Therefore, instead of radiation or rays is also referred to below by light or light rays.
  • the light source is preferably arranged and arranged to radiate a predominant part of its light directly onto the mirror.
  • the predominant part of the light of the radiation source means that the mirror is arranged in the direct beam path of the light source.
  • the mirror preferably comprises a reflective surface onto which this radiation of the light source can impinge and be mirrored.
  • the mirror is in this case
  • the reflector is therefore preferably arranged in the beam path of the mirror to the mirror
  • the reflector preferably comprises a partially reflecting, preferably at least partially planar surface.
  • a flat surface for reflection of the light has the advantage that it can be simple in construction, for example by a surface coating on the flat, low-cost body to be manufactured.
  • the reflector can be formed very thin, which contributes to a very low height of the luminous element and the lighting module based thereon.
  • This flat surface therefore also makes it possible
  • the direction in which the majority of the light is emitted after reflection at the reflector surface corresponds approximately to the direction in which the
  • Light source emits its light. Starting from the
  • Direction in which the light source emits the light is the radiation pattern through the system for
  • a preferably at least partially diffuse reflection at the reflector surface is of great advantage in order to achieve a homogeneous light distribution in the beam path to the reflector.
  • suitable means for absorbing such radiation may be provided, preferably in the form of a diaphragm or by a
  • absorbent element can already absorb the light from the light source, which does not hit directly on the mirror, and thus prevent unwanted stray radiation, which to
  • Brightness differences can lead, which in turn can adversely affect the desired homogeneity.
  • a light-emitting element that is to say a light-emitting diode (LED), as the light source.
  • LED light-emitting diode
  • other forms of light sources are conceivable, for example, light from a remote light source means
  • Optical fiber are introduced.
  • light-emitting diodes are advantageous due to their low power consumption, their longevity, their small size and their easy mounting option.
  • the light source is also possible, for example with one of several light sources, for example a plurality of light-emitting diodes. These light emitting diodes may be arranged substantially along a line, wherein the light emitting diodes on the line or in a
  • the light source may intermittently have one or more
  • For the invention are advantageously bright or white
  • Luminosity and thus to achieve a sufficiently high brightness.
  • Luminosity and thus to achieve a sufficiently high brightness.
  • LEDs For white emitting LEDs, blue LEDs known to those skilled in the art can be used with a yellowish luminescent layer arranged in front of them, this layer acting as a wavelength converter. In general, such "white" LEDs
  • LEDs that produce a white hue of the mix of red, green and blue LEDs are more energy efficient than LEDs that produce a white hue of the mix of red, green and blue LEDs.
  • the opening or emission angle of the light source is not too large in order to achieve a high efficiency of the luminous element and to reduce losses as far as possible.
  • the beam angle is the angle that is included by lateral points with half maximum light intensity.
  • the mirror in the radiation steering system is the first element to which most of the light emitted by the light source falls. It is advantageous that it is concavely curved from the light source
  • the curved, concave surface of the mirror is preferably mirrored and thus provides the
  • the mirror surface is preferably arranged so that incident beams of the light source are deflected in the direction of the reflector.
  • the mirror surface is preferably arranged so that no mirrored rays can fall directly on the light exit window.
  • the inventors have found that in particular a high homogeneity of the radiated from the reflector
  • Light can be achieved when the beams are already deflected by the reflector in the beam path upstream mirror at different angles in the direction of the reflector, so that the mirror in the direction Reflector mirrored radiation is preferably not predominantly collimated.
  • the mirror may be a tilted paraboloid.
  • the light source is preferably in
  • Focus of the paraboloid Of great importance is the ratio of the focal length of the paraboloid to the size of the light-emitting surface, so in the case of an LED as the light source of the chip area, as this results in the size of the mirror.
  • the distance of the focal point from the vertex may be in a range of up to 10 mm, preferably up to 5 mm, and more preferably up to 3 mm.
  • a distance of 3 mm is very well suited when using an LED as a light source, which is arranged at the focal point of the parabola and has a chip width of 0.5 mm.
  • the beams preferably do not leave the mirror in a collimated state and are therefore preferably, at least predominantly, not parallel to one another. This has the consequence that they impinge on the reflector surface at different angles. This effect already leads to a very good homogeneity of the incident light on the reflector.
  • homogeneous light or homogeneity of the light is a homogeneous
  • the illuminance also known as luminous flux density or luminance, describes a surface-related luminous flux which strikes an illuminated object. It can be specified in the size cd / m 2 .
  • An overall homogeneity can thus be quotient of the lowest brightness by the largest one
  • values can also be expressed as a percentage of the achievable homogeneity, so that the achievable overall homogeneity of the luminous element and of the illumination module can be 70%, preferably at least 75% and particularly preferably at least 80%. In certain embodiments, values could also be achieved about 83%.
  • the total homogeneity can be used in a monitor, which is approximately 90% in white.
  • a value of from about 70%, especially from about 80% is considered homogeneous.
  • the second parameter concerns the relative local
  • Homogeneity deviation is defined as the relative change in brightness per unit length, e.g. in
  • Homogeneity deviation can be determined according to the following rule: (Brightness (p) - Brightness (p + d)) / ((Brightness (p)
  • the underlying measured values can either be measured or determined by means of suitable simulation models.
  • the local homogeneity deviation of the luminous element and the illumination module is at most 0.75% / mm, preferably at most 0.70% / mm and especially at most 0.65% / mm.
  • This value can for example be compared with a luminaire comprising LED light sources, in which the homogeneity is achieved by a distance of the LEDs of 20 mm. If this luminaire also has an overall homogeneity of 83%, but the brightness changes every 20 mm with the period of the LED arrangement, a significantly less favorable local homogeneity deviation of 2.5% / mm results.
  • the mirror surface preferably has a multiplicity of planar mirror elements set against one another, which are placed against each other as densely as possible and without gaps.
  • the individual mirror elements are even, so that the mirror surface is formed as a discontinuous mirror surface, comprising a plurality of juxtaposed planar mirror elements.
  • the number of mirror elements can vary, and in the case of planar mirror elements, the accuracy of the contour simulation with the number of mirror elements
  • Mirror elements is rising.
  • at least five or more planar mirror elements can be provided.
  • the individual mirror elements of the mirror are arranged so that they deflect the beams differently depending on the emission direction of the light source.
  • the size of the mirror elements is preferably determined as a function of the position relative to the light source so that approximately the same amount of light of the light source falls on each mirror element.
  • the size of the mirror elements depends on their respective angle with respect to the light source and may be of one
  • the mirror may comprise a base, the surface of which, pointing towards the light source, may be formed with the corresponding mirror elements or the reflecting surface contour. This surface can then, for example, with a mirror
  • the surface of the reflector can also be equipped with a surface layer or comprise a layer system which has a predetermined emission characteristic.
  • the surface of the reflector has a partly diffuse and partly specularly reflective
  • the diffuse portion is higher than the specularly reflective
  • the proportion is more diffuse
  • Radiation of the reflector between 70% and 90%, preferably between 75% and 85% and most preferably about 80%, wherein the respective remaining portion of the radiation then specular reflected, that is mirrored, can be.
  • the illumination module according to the invention for emitting a homogeneous light from a flat light exit window can be a receptacle or holder for holding the
  • lighting element may further comprise the facilities required for the operation of the luminous element, that is, for example, a heat sink or
  • Heat conductor for heat dissipation of the heat generated during operation of the light source or else corresponding
  • Light box of the lighting module advantageous from low height.
  • the height is the extent of the
  • Lighting module in one direction parallel to the
  • the light box has a height of less than 100 mm, preferably less than 60 mm, more preferably less than 40 mm and most preferably 20 mm or less.
  • Beam guidance corresponds. This expansion in the direction of the beam guidance is also referred to below as width.
  • this width of the light exit window of the light box is at least 5: 1, preferably at least 10: 1 and particularly preferably at least 20: 1. This means, that at a height of the light box, for example, 20 mm, a width of the light exit window of 400 mm or more is possible.
  • Light exit window can be 200 mm up to 2,000 mm. Lower widths are technically possible, but require very small light sources. With even greater widths over 2,000 mm, it may be more difficult to maintain a sufficient luminance.
  • the translucent element may be made of glass or plastic.
  • the translucent element equipped with additional decorative elements.
  • the translucent element may for example be colored and / or include additional decorative elements to produce a predetermined visual impression.
  • the lighting module comprises further devices which prevent the light from the light source directly onto the light exit window falls.
  • the devices can be designed to direct this light into non-critical areas of the lighting module.
  • Light emission window of the light box can penetrate to the outside.
  • the diaphragm and / or the absorbing element in such a way that no light is reflected in such a way that it impinges on the mirror at a different angle than light originating directly from the light source. This can be uneven
  • Brightness field on the mirror surface which in turn is unfavorable for the desired high homogeneity of the emitted light.
  • reflectors which are adapted to increase the brightness in the edge region of the reflector surface, where tend to impinge rather small amounts of light, and thus the homogeneity of the emitted light
  • the lighting module according to the invention may have more than one single light source, for example also a plurality of preferably arranged in series
  • Light sources This is advantageous if not only a large width of the light exit window is desired, but also a large length, ie an extension in a direction perpendicular to the beam guide.
  • the plurality of light sources are preferably arranged along a longitudinal line. Also advantageous are arranged along this line light sources arranged uniformly over the length. Conveniently, the distance between two adjacent light sources is the same. For a homogeneous light, it is advantageous if the distance between two adjacent light sources is not greater than the shortest distance of the light exit surface of the light source to a straight line which extends along the surface of the light source
  • Light emission window runs. This ensures homogeneous light distribution even in the longitudinal direction.
  • width and length of the light exit window are merely selected in order to respectively increase the different extents of the light exit window in relation to the further components of the illumination module
  • Light emission window can be.
  • An illumination module according to the invention can comprise, for example, a light exit window with a width of 400 mm and a length of 500 mm with a height of 20 mm. In this lighting module can be about 50 Light sources laterally offset from the
  • Light exit window to be arranged in the longitudinal direction.
  • Lighting modules provided, wherein the one
  • Light box Z collisions Preferably, these end faces each comprise the light exit window, so that the two light exit windows Z can collide and virtually a common, then twice as wide
  • the width of the light emission window can be doubled, so that widths in a range of more than 500 mm up to 1,000 mm or even beyond are possible.
  • Light emission window can be a common
  • the light sources can then each be arranged along the outside of the light boxes.
  • the invention makes it possible to build very flat
  • Lighting options conceivable, for example, a use as a backlight for advertising, information or display panels.
  • Fig. 1 shows schematically a section of a
  • Illumination module with a luminous element in cross section
  • Fig. 2 schematically shows a section of a
  • Illuminating module according to FIG. 1 in cross-section with a large number of marked light beams
  • Fig. 3 shows schematically the radiation course
  • FIG. 4 schematically shows a lighting module according to FIG. 1 in FIG.
  • FIG. 5 shows a schematic cross-section of a view with two illumination modules of FIG. 1 arranged in mirror image relative to one another
  • Fig. 6 the result of a measurement of the luminance along the width of the light exit window of a lighting module according to the invention with a parabolic mirror
  • 7 shows the result of a measurement of the luminance along the width of the light emission window of a further illumination module according to the invention with a non-parabolic mirror
  • FIG. 8 shows schematically a lighting module in cross-section with a non-parabolic mirror according to the measurement from FIG. 7, FIG.
  • Fig. 11 is a comparison of different geometrical dimensions
  • Fig. 12 shows a further comparison of different
  • FIG. 1 shows schematically a section of a
  • Illumination module with a luminous element in cross section.
  • this schematic representation is alone the
  • Holding means for attaching and holding the components as well as other devices of the marked as a whole in the illustration by the reference numeral 1
  • Lighting module has been omitted. So are
  • the luminous element is in this representation in the
  • Lighting module 1 integrated.
  • it can also be manufactured as a separate component and in the
  • Lighting module to be installed.
  • the luminous element comprises a punctiform light source 10, a mirror 20 and a reflector 30.
  • Illumination module 1 is given a coordinate system.
  • the direction indicated by “x” denotes the width
  • the direction indicated by “y” denotes the length
  • the direction designated by “z” denotes the height of the
  • the illumination module 1 shown in the example comprises a light box 100 with an opening 101 defining a light exit window. Only a small section of the illumination module 1 is shown, which shows the illumination module 1
  • the Light source includes.
  • the lighting module 1 is in the Capable of producing a homogeneous light from the plane
  • the brightness of the emitted light of the light source 10 is homogeneous over the area defined by the opening 101, which means in particular that it does not jump
  • mirror 20 and the reflector 30 of the luminous element With the mirror 20 and the reflector 30 of the luminous element, the rays emitted by the light source 10 can be directed in a desired direction. Accordingly, mirror 20 and reflector 30 constitute a cooperative system for radiation control. Light source 10 emits light during operation.
  • the light source 10 is set up so that it radiates a predominant part of its light directly onto the mirror 20.
  • the reference numeral 11 indicates that direction of the radiation in which the intensity is highest.
  • the radiation of the light source 10 is further emitted in accordance with Lambert's law, which is advantageous in order to produce the most homogeneous possible illumination, as a function of the
  • Beam angle a precisely determinable amount of light per
  • Angular segment is emitted.
  • the predominant part of the light of the light source 10 falls on the mirror 20 arranged directly in the beam path.
  • the mirror 20 is in this case relative to the light source 10 and to the reflector 30 arranged that a large part of the light received by the light source is deflected after reflection in the direction of the reflector 30.
  • the reflector 30 is therefore arranged relative to the mirror 20 such that a majority of the mirror 20
  • the reflector 30 comprises for this purpose a planar, partially reflecting surface 31.
  • this surface 31 comprises at least one layer, which is particularly simple and with predetermined optical
  • the reflector 30 is therefore very thin
  • the surface 31 of the reflector 30 reflects the incident light of the light source 10 in operation at least partially diffusely in the direction of the light exit window 101.
  • the main direction in which the majority of the light of the light source 10 radiates after reflection on the reflector surface 31, approximately corresponds to the direction in which the light source 10 emits its light.
  • the radiation path through the system for radiation deflection is approximately z-shaped.
  • a light beam 13a, 13b, 13c is illustrated, which illustrates the approximately z-shaped radiation steering in the direction of the width of the illumination element 1.
  • the reference numeral 13a is a light beam
  • the light source 10 is formed in the example as white-emitting light emitting diode (LED). Of course, it is also possible to use different colored LEDs or other light sources, such as optical fibers.
  • LED white-emitting light emitting diode
  • the light source 10 further has an example in the example
  • Beam angle of 120 ° Beam angle of 120 °. Larger radiation angles are rather unfavorable, since then larger portions of the emitted light no longer impinge directly on the mirror 20.
  • an optical element for focusing the beams (not shown), for example a converging lens.
  • the mirror 20 includes a curved, concave surface 21, which faces the light source 10. This surface is mirrored and thus provides the mirror surface. To get a high homogeneity of the radiated
  • Light source 10 undergoes a deflection, which in the direction of the reflector 30 and thus away from the
  • Light exit window 101 leads.
  • the mirror surface is designed so that
  • the mirror 20 is a 2 ° tilted paraboloid, so a kind of parabolic mirror, which does not collimate the light in the direction of the axis, but tilted by 1 ° thereto. As a result, the light is not mirrored parallel to the reflector 30, but runs from the mirror at 2 ° towards him.
  • the light source 10 is in this example in the focal point B of the non-tilted paraboloid, so the mirror 320.
  • the focal point B of the parabola is about 3 mm away from the apex of the paraboloid.
  • the light source 10 has a chip width of 0.5 mm, which dimension relates to the extent in the direction "x".
  • the mirror surface has, at least approximately, a shape as a paraboloid.
  • the mirror surface is still like that
  • Reflektors is therefore rather large. From the mirror 20 mirrored rays have a
  • Divergence is mainly due to chip width of the LED and is in the 0 ° direction in the current example +/- 2.4 ° when using an LED as a light source with 0.5 mm chip width.
  • the divergence is +/- 4.8 °.
  • the divergence reduces to about +/- 1 ° for a 0.5 mm LED or +/- 2 ° for a 1 mm wide LED.
  • the size of the mirror is selected depending on the chip width and the divergence such that the divergence is not too large.
  • Reflector surface 31 causes a very good homogeneity of the light is given on the reflector surface 31.
  • the impact angle indicated in the illustration as an angle, is between 89.5 ° and 20 °, preferably between 89 ° and 30 ° and particularly preferably between 89 ° and 35 °.
  • the imaged light beam 13b strikes, for example, at an angle of about 30 °
  • Radiation reflected by the reflector surface 31 is radiated in a direction at least approximately corresponding to the emission direction of the light source 10.
  • the chip area of the LED and the reflector surface 31 are particularly favorable at least approximately parallel to each other. That of the
  • Reflector 30 radiated light is homogeneous in the context of the invention.
  • the overall homogeneity of the illustrated illumination module 1, that is to say the quotient of the lowest brightness and the greatest brightness, stated in percent, is 83% in the exemplary embodiment shown and thus corresponds to the requirements for homogeneity.
  • the local homogeneity deviation ie the relative
  • Change in the brightness per unit length is in the illustrated embodiment at most 0.75% / mm.
  • the mirror surface in the embodiment has for this purpose a number of 25 juxtaposed, planar
  • Mirror 20 are arranged so that they deflect the radiation differently depending on the emission direction of the light source 10.
  • the size of the mirror elements is selected so that approximately the same amount of light of the light source 10 falls on each mirror element. This leads to a
  • Mirror with a different number of mirror elements or the concave, preferably at least approximately parabolic mirror surface continuously To design, for example, by editing the surface with appropriate finishing tools.
  • the light source 10 is located near the focal point B of the mirror 20, as long as the concave mirror surface 20 constructed from the mirror elements would be compared to a paraboloid.
  • the light source 10 can also, if it is structurally useful, be positioned elsewhere, for example offset upwards.
  • the light source 10 can for example sit on a base connected to the light box, which also serves as a heat sink.
  • Mirror 20 may also include a socket in which the mirror elements are facing the light source
  • this is provided with a reflective surface coating, in the example a
  • Mirror surface is at least 80 °, preferably at least 90%, more preferably at least 95% to keep losses low and high efficiency of
  • the surface 31 of the reflector 30 is also provided with a surface layer.
  • a surface layer In the example, it is a metallic layer system with a
  • the proportion of the diffusely reflected radiation of the reflector is between 70% and 90%, preferably between 75% and 85% and most preferably 80%. The remaining portion of the radiation is reflected speculatively.
  • the light box 100 of the lighting module 1 is of low overall height. A low height is of great
  • Lighting module for example, to cramped under
  • the achievable height is limited by the requirements of the radiation steering in order to obtain a homogeneous luminous surface.
  • the system according to the invention for radiation control was particularly in view of a low height at
  • the section shown in FIG. 1 comprises only a very small proportion in relation to the width of the light box, so that the actual size ratios of the Illumination module 1 of FIG. 1 can not be completely removed.
  • the light exit window which is only indicated in FIG. 1 has, for example, an extension in the direction "x", that is to say a width of approximately 400 mm
  • Light box is only 20 mm. This results in a ratio of the width of the light exit window 101 to the height of the light box of 20: 1. According to the invention, this ratio can be at least 5: 1, preferably at least 10: 1.
  • the opening of the light box forming the light exit window 101 is closed by a light-transmitting element 102, which likewise is shown only schematically in a section in the illustration.
  • the opening of the light box is thereby closed, so that no dirt or moisture can penetrate into the light box.
  • the translucent element is a glass. In addition to glass, plastic materials are also possible.
  • the translucent element is equipped with additional decorative elements.
  • the translucent element may for example be colored and / or comprise additional decorative elements. Direct imprints are also possible.
  • Light source 10, mirror 20 and light exit window 101 of the lighting module 1 are so to each other
  • an absorbing element 40 is provided, which prevents laterally emitted light of the
  • Light source 10 can escape. Such a light beam is in the illustration with the reference numeral 14a
  • This light beam 14a is prevented from leaking directly through the light emission window 101 by the absorbing member 40.
  • a further absorbing element 41 is also provided, which absorbs part of the light radiation reflected by the mirror 20. In this way it is possible to produce a broad, homogeneous light field already on the reflector surface 31. It is conceivable to provide the absorbing elements 40, 41 with a reflective surface to there
  • Mirror surface 21 leads to lighter areas, which then also transferred to the reflector surface 31 and ultimately lead to a poorer homogeneity.
  • Lighting module 1 can also have a larger in
  • Illumination module 1 a plurality of light sources 10, which are arranged along a longitudinal line.
  • the light sources 10 are arranged uniformly along the line over the length, wherein the distance between two adjacent light sources 10 is the same.
  • the length that is to say the extent in the direction "y"
  • the light exit window 101 indicated in the example in FIG. 1 has a length of 500 mm the
  • Illumination module 1 comprises a light source 10 per cm length of the light exit window 101. This ratio has proved to be favorable to produce a homogeneous light in the longitudinal direction. Of course, larger and smaller dimensions in the longitudinal direction are possible.
  • the distance between two adjacent light sources 10 is not greater than the shortest distance of the light exit surface of the light source 10 to a straight line which extends along the surface of the light exit window 101. This also ensures a longitudinal direction
  • Fig. 2 shows schematically a section of a
  • Illumination module 1 according to Fig. 1 in cross section with a plurality of drawn light beams, wherein the
  • Light source 10 is indicated and the associated mirrored light beam 13b. It can be clearly seen in the illustration that the mirrored light beams are not collimated, but run at different angles.
  • the reference numeral 13d denotes a light beam which impinges on the diaphragm 40.
  • FIG. 3 schematically shows the course of the radiation by way of example for a light beam 13a, which is mirrored on the mirror 20, in an overall view.
  • FIG. 4 shows schematically a lighting module 1 according to FIG.
  • the Reflector 30 and the light exit window 101 arranged plane-parallel to each other, wherein the reflector 30 has approximately the same extent as the light exit window 101st
  • Fig. 5 shows schematically a view of a
  • Lighting device comprising two mirror-image mutually arranged lighting modules 1, in cross section.
  • the two lighting modules 1 collide at the end faces of the light box 100 together.
  • Light emission window 101 defining openings of the two light boxes 100 to each other, so that the two
  • Light emission window 101 along a common edge Z collide and provide a common light emission window of double the width.
  • a common translucent element such as a
  • FIG. 6 shows the result of a measurement of the luminance along the width of the light exit window using the example of a lighting module 1 with a 400 mm wide
  • Light emission window and a parabolic mirror 20 Shown are the luminance and the
  • the luminance given here corresponds to the luminance and, in the context of this invention, describes the surface-related luminous flux which strikes an illuminated object.
  • the luminance is given in the size cd / m 2 .
  • the local homogeneity deviation is given in the size% / mm and represents the relative change in the brightness per
  • Length unit is.
  • the measured total homogeneity is about 90%.
  • Homogeneity deviation is about 0.6% / mm.
  • Homogeneity deviation in the dimension mm -1 corresponds to a homogeneity deviation in the dimension (% / mm) after multiplication by 100.
  • Lighting module 1 is about 38%.
  • Embodiment to call the measured brightness as homogeneous The most slight fluctuations of the
  • Luminance are not considered to the human eye
  • the embodiment shown makes it possible in a particularly simple manner, the width of the light emission window significantly increase without the same time
  • FIG. 7 shows the result of a measurement of the luminance along the width of the light emission window using the example of a further illumination module 1 according to the invention with a 400 mm wide light exit window and a non-parabolic mirror 20.
  • Total homogeneity is also about 90%.
  • the local homogeneity deviation is about 0.75% / mm and is thus slightly less favorable than in the parabolic mirror embodiment.
  • Lighting module 1 is slightly higher at about 44%. This is also in this embodiment, the
  • Fig. 8 shows schematically a lighting module 1 in
  • Fig. 9 shows the result of a comparison simulation of the luminance along the width of a light emission window when using a number of 25 LED light sources as direct illumination.
  • the brightness, ie the luminance, is therefore significantly higher than in the preceding
  • the measured total homogeneity of this arrangement is about 90%.
  • the local homogeneity deviation is
  • Brightness differences of this arrangement are visible to the naked eye, in particular due to the stripe pattern.
  • Fig. 10 also shows purely schematically the
  • LED light sources 210 are shown whose spacing is selected such that a
  • Fig. 11 shows a comparison of different
  • the picture shows a tilted parabolic mirror, a parabolic mirror and a tilted parabolic mirror with non-parabolic outlet.
  • parabolic outlet has the advantage that a greater distance to the light source 10, so for example to the LED, is given. Therefore, this arrangement is less sensitive to tolerances. In the juxtaposition is the
  • FIG. 12 shows a further comparison of different mirror shapes in a reference system in which the light source is again arranged in position (0, 0). Shown are a parabolic mirror 320, a 2 ° tilted parabolic mirror 20 and mirror 220 with higher focal length and additional bend at the outlet. This embodiment is characterized by a lower tolerance sensitivity as well as a higher efficiency. Furthermore, it can cause a better illumination of the reflector very close to the mirror.
  • the present invention thus makes it possible to provide particularly flat-mounted lighting modules, which simultaneously over comparatively large
  • Radiation control according to the invention the light occurs very homogeneous from the light exit window.
  • the lighting module for interior lighting, for example as cabin interior lighting in commercial aircraft.
  • Lighting options conceivable, for example, a use as a backlight for advertising, information or display panels.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un élément lumineux, comprenant une source de lumière (10) de préférence linéaire, un miroir (20) et un réflecteur (30), pourvu de préférence au moins en partie d'une surface plate, la source de lumière (10) étant conçue pour émettre une partie majoritaire de sa lumière directement sur le miroir (20), le miroir (20) réfléchissant la lumière reçue de la source de lumière (10) en direction du réflecteur (30), et le réflecteur (30) comprenant de préférence une surface (31) en partie réfléchissante et réfléchissant cette lumière au moins en partie de manière diffuse dans une direction dont la direction principale correspond approximativement à la direction dans laquelle la source de lumière (10) émet sa lumière. L'invention concerne également un module d'éclairage (1) destiné à émettre une lumière homogène à partir d'une fenêtre de sortie de lumière (101) plane, comprenant un caisson lumineux (100) pourvu d'une ouverture définissant une fenêtre de sortie de lumière (101) et au moins un élément lumineux.
PCT/EP2019/058342 2018-05-14 2019-04-03 Élément lumineux et module d'éclairage présentant une faible hauteur de construction WO2019219289A1 (fr)

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DE102018111456.7 2018-05-14
DE102018111456.7A DE102018111456A1 (de) 2018-05-14 2018-05-14 Leuchtelement und Beleuchtungsmodul mit geringer Bauhöhe

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US20050185422A1 (en) * 2004-02-20 2005-08-25 Eta Sa Manufacture Horlogere Suisse Backlighting device for an information display element of a portable object
DE102007044566A1 (de) 2007-09-07 2009-03-12 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Beleuchtungssystem
WO2011019753A1 (fr) * 2009-08-13 2011-02-17 Intematix Corporation Lampes à del
DE102010001204A1 (de) 2009-01-26 2011-05-12 Ledon Lighting Jennersdorf Gmbh Längliches Leuchten-Element und damit beleuchtetes Panel
DE102011013206A1 (de) 2011-03-05 2012-09-06 Diehl Aerospace Gmbh Flächenleuchte, insbesondere für Flugzugkabinen
JP2012244085A (ja) * 2011-05-24 2012-12-10 Panasonic Corp 照明装置
US20160209005A1 (en) * 2015-01-21 2016-07-21 Laxco Inc. Uniform illumination lighting module
EP3290791A1 (fr) * 2016-09-01 2018-03-07 Valeo Vision Module lumineux de vehicule automobile a organe de refroidissement

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US7229198B2 (en) * 2003-06-16 2007-06-12 Mitsubishi Denki Kabushiki Kaisha Planar light source device and display device using the same
KR20130051133A (ko) * 2011-11-09 2013-05-20 삼성전자주식회사 액정패널조립체 및 그를 구비한 액정 디스플레이 장치
CN107062103A (zh) * 2013-02-01 2017-08-18 夸克星有限责任公司 包括多个发光元件的照明装置
JP6216301B2 (ja) * 2014-09-19 2017-10-18 ミネベアミツミ株式会社 照明装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050185422A1 (en) * 2004-02-20 2005-08-25 Eta Sa Manufacture Horlogere Suisse Backlighting device for an information display element of a portable object
DE102007044566A1 (de) 2007-09-07 2009-03-12 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Beleuchtungssystem
DE102010001204A1 (de) 2009-01-26 2011-05-12 Ledon Lighting Jennersdorf Gmbh Längliches Leuchten-Element und damit beleuchtetes Panel
WO2011019753A1 (fr) * 2009-08-13 2011-02-17 Intematix Corporation Lampes à del
DE102011013206A1 (de) 2011-03-05 2012-09-06 Diehl Aerospace Gmbh Flächenleuchte, insbesondere für Flugzugkabinen
JP2012244085A (ja) * 2011-05-24 2012-12-10 Panasonic Corp 照明装置
US20160209005A1 (en) * 2015-01-21 2016-07-21 Laxco Inc. Uniform illumination lighting module
EP3290791A1 (fr) * 2016-09-01 2018-03-07 Valeo Vision Module lumineux de vehicule automobile a organe de refroidissement

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