DE102010034774A1 - Lamp e.g. busbar lamp, for lighting working station, has lighting arrangement comprising two set of lighting units, where one of set of lighting units is arranged before other set of lighting units with respect to main radiation direction - Google Patents

Abstract

The lamp (1) has a lighting arrangement (2) comprising a set of lighting units (3) i.e. LEDs (5), for emitting directed light flux (Lg) and another set of lighting units (4) i.e. organic LEDs (6), for diffusing the emitted light flux. The former set of lighting units is arranged before the latter set of lighting units with respect to a main radiation direction (h) of the lamp. The two set of lighting units are arranged in two planes (8, 9), respectively, where the planes are arranged parallel to each other. A secondary optic arrangement comprises a secondary optic unit e.g. lens and reflector.

Description

The invention relates to a luminaire with a luminous means arrangement which has a first luminous means emitting a directed luminous flux and a second luminous means emitting a diffuse luminous flux.

Such lights are often used for workplace lighting to optimize the illumination of the workplace and / or its environment on the different luminous flux components. These lights are often designed as track lights.

In the DE 10 2009 014 873 U1 It is proposed to radiate the directed luminous flux of the first luminous means by means of reflector shells obliquely in two different directions.

The invention has for its object to provide a generic lamp that allows further optimization in the illumination of the workplace.

The stated object is achieved by the features of claim 1. Advantageous developments are described in the subclaims. The stated object is already achieved in that the first lighting means is arranged with respect to a main emission of the lamp in front of the second light source.

It is thus proposed to arrange the two illuminants with respect to the main emission direction one behind the other in such a way that a direct mixture of the different luminous flux components can be achieved or can be acted upon directly on this mixture via the design and control of the luminous means. The arrangement of the second illuminant behind the first illuminant makes it possible to attenuate the light concentration of the light of the first luminous means, which is more punctually illuminating, less tiring for the user's eye, by means of the diffuse light of the second illuminant, without reducing the illuminance of the first illuminant. which would be the case, for example, when dimming the first light source. Thus, a workplace or living room space, matched to its spatial conditions and / or its use, be optimally illuminated.

The light source with directional luminous flux may be a point-like acting light source, such as energy-saving bulb or light bulb, preferably LEDs, in particular so-called. Power LEDs with increased light emission, or a line-like light source such as fluorescent tube act. In both cases, the location of the light emission is essentially concentrated on a central point or on a central line. As a result, the light distribution with respect to a to the point or to the line radially spaced tangential illumination surface, such as a work table surface, fail unevenly with area-like or strip-like illumination maximums. The light distribution with respect to this illumination surface can be made more homogeneous with respect to this illumination surface by means of the second illuminant having a diffuse luminous flux which follows the main emission direction, since in this way regions between the illumination maxima can be further illuminated.

The first and second lighting means can preferably be dimmable or switched on and off independently of each other. Thus, the luminaire can optionally emit a pure directed luminous flux or a pure diffuse luminous flux. The illumination can be controlled or regulated in a time-dependent and / or sensor-controlled manner, for example via a daylight sensor or an infrared sensor for detecting the presence of a user.

Preferably, the first lighting means is designed as an LED, in particular as a power LED. The second lighting means may be, for example, a transparent electroluminescent film. Preferably, the second lighting means is designed as a film-like transparent OLED. The OLED can be applied to a permanently transparent support of, for example, glass or acrylic glass, preferably laminated. Supply lines, such as control and / or supply lines can also be designed to be at least approximately transparent, so that they do not noticeably appear inactive. The carrier with the OLED can be variously bent or kinked, whereby the light of the OLED can be scattered reinforced.

Both illuminants can each serve, in their at least approximately transparent form of formation, to a certain extent as secondary optics for the light emitted by the luminous means, for example by scattering, dimming and / or coloring the light at the second illuminant.

In a preferred embodiment, the luminaire may have a multiplicity of first luminous means. These can be arranged in a first plane. Furthermore, the second illuminant may extend flat in a second plane. Both planes can be arranged at least approximately parallel to one another. The two levels can be arranged in the use position of the luminaire at least approximately parallel to a work surface to be illuminated. The first and / or second plane may be planar or curved. Preferably, the second plane is spherical segment-like educated. In an alternative embodiment of the luminaire, a number of first and / or second levels may be provided. In this case, each first level can be assigned at least one first light source. It can be assigned to every second level, a second light source. The first planes can be arranged at an angle of less than 180 ° to each other. Preferably, the second planes can be arranged at an angle smaller than 180 ° to each other. The first and / or second planes may be formed as planar and / or curved surfaces. They can each be arranged in a cassette-like manner to each other. The planes can each be curved and arranged such that they can connect to one another in a transitional manner. You can, for example, form a wave-like, in particular sinusoidal profile. Each of these measures can increase the amount of scattered light. It can be assigned to every second level an OLED. Preferably, the OLEDs are electronically coupled to each other so that they can be controlled individually, in groups and / or as a whole.

The first lighting means may be arranged on a support extending in the first plane. The adjacent first lighting means are preferably arranged at equal distances from each other on the carrier. The carrier may be designed to increase the light output in the main emission non-transparent and reflective. In this way, the light emitted by the second illuminant diffusely in the direction of the first illuminant can be reflected toward the carrier, at least with a directional component in the main emission direction, toward the second illuminant. Thus, the light emitted in the main emission light of the lamp can be amplified. In a likewise preferred embodiment of the luminaire, the carrier can be made transparent. In this way, the light emitted by the second luminous means towards the first luminous means can radiate through the carrier and correspondingly diffuse a space in the main emission direction in front of the first illuminant. Thus, the contrast can be mitigated for example between the lighting, for example, the worktable surface and the surrounding space, which is usually perceived as pleasant. In both cases, the luminous efficacy, that is, the use of the luminous flux emitted by the lamp, can be improved. Furthermore, in the case of reflection on the carrier, the above-mentioned light distribution with respect to the illumination surface can be made more homogeneous.

In a preferred embodiment, the luminaire may have a secondary optics arrangement for directing the light and / or filtering the light emitted by the luminous means. By means of the secondary optical arrangement, the luminous flux can be influenced with respect to its emission angle and, in particular, can influence, in particular be more homogeneously, the abovementioned light distribution with respect to the illumination surface.

The secondary optics assembly may have a first secondary optic for the first illuminant, preferably in the form of a lens and / or a reflector. In this case, the first secondary arrangement can be arranged in the main emission direction of the luminaire behind the first luminous means. In the case of a designated multiplicity of first lighting means, at least some, a plurality or at least almost all lighting means may each have a secondary optics associated therewith. For example, in the case of the provision of LEDs as the first light source, the first secondary optics can connect directly to the respective associated LED. By means of the reflector, a light bundling of the luminous flux from the LED can usually take place. By means of the secondary optics embodied as a lens, the emitted light of the LED can be deflected in a specific direction, so that a focusing of the emitted light can take place. It can be provided that the secondary optics deflects the emitted light of the individual LEDs in the same direction. On the other hand, the light adjacent LEDs can be deflected by the first secondary optics so that their light with a direction component to each other or from each other. Preferably, the light emitted by the LEDs is deflected mirror-symmetrically with respect to a mirror-symmetry plane perpendicular to the first plane by means of the first secondary optics.

The secondary optics assembly may include a second secondary optic for the second illuminant. This can be arranged in the main emission direction in front of and / or behind the second illuminant. By way of the second secondary optics, the diffuse light emitted by the second illuminant can be deflected in a certain direction, for example. Thus, for example, the light emitted in the direction of the first luminous means can be deflected by the second luminous means in such a way that total reflection can take place on the support for the first luminous means.

The second secondary optic preferably has a lens with a surface prism arrangement. This lens can extend at least almost over the entire second luminous means, in particular the entire OLED. This second secondary optics can at the same time influence the beam path of the light emitted by the first illuminant towards the second illuminant, in which, for example, a deflection of the light in a certain direction takes place. The second secondary optics can be designed as a prismatic disk. The OLED can be applied to the second secondary optics as a carrier. Advantageously, the OLED on be arranged a preferably unstructured larger side surface of the prismatic disk. The prismatic lens can have optical gaps for wider illumination, which can cause uninterrupted and unreflected light to strike.

In a further preferred embodiment of the luminaire, the secondary optics assembly can have a third secondary optic assembly, which is arranged in the main emission direction in front of and / or behind the first luminous means or in front of or behind the first plane. This third secondary optic can have at least one optically active functional layer. By means of this at least one optically active functional layer, the light passed through the third secondary optics can be influenced in a certain way.

According to their mode of operation and their efficiency, by means of the functional layer, for example when the functional layer is arranged in the main emission direction in front of the first luminous element or the luminous elements, radiation of the light emitted by the first luminous elements toward the main emission direction can be prevented at least in a limited or complete manner, the light on or can be absorbed, scattered and / or reflected by the functional layer. The functional layer laterally preferably extends over the surface area of the carrier for the first lighting elements.

The functional layer can work on its own. Depending on the desired scattering, absorption and / or reflection, the type of functional layer can be selected. Functional layers generally include those functional layers which, in one state, have the optical properties of a "normal" pane with high or possibly somewhat reduced transparency and in another state cause scattering, absorption and / or reflection of the incident light, a transition from a state in the other state is controllable or controllable via a switching pulse or -Vorgang.

There are any functional layers in question, which can be selectively controlled or regulated in their optical properties. The functional layer can be controlled or regulated independently of the operating state of the OLED and / or as a function of the light emitted by the OLED, such as via the wavelength or amplitude thereof. The functional layer can be tuned to the frequency or the frequency range of the light emitted by the first and / or the second light-emitting element in such a way that it essentially scatters, absorbs and / or reflects light of this frequency or of the frequency range.

In a preferred embodiment of the luminaire, the functional layer can be designed as electrochromic glazing. The electrochromic glazing can change the light transmission or the transmission depending on the applied DC voltage. As a result, the transmissive radiation maximum may shift. For example, the shift may be to the blue.

In other preferred embodiments of the luminaire, the electrochromic glazing may at least partially diffuse the incident light with the application of the direct electrical voltage. This makes it possible to increase the milky or opaque electrochromic glazing and the proportion of diffuse luminous flux component.

In both embodiments, low current can activate the electrochromic layer. By zeroing or reversing the polarity of the applied voltage, the optical effect of the functional layer can be reset. The electrochromic glazing can become transparent again. As an advantageous electrochromic glazing can alternatively a film of polymer-dispersed-liquid-crystal (PDLC), which becomes transparent with application of an electric voltage and without the same milky-turbid, and / or a film with "suspended-particle-devices" (SPD ) are used, which darken by applying a voltage to obtain transparency within a few seconds.

The necessary DC voltage in an electrochromic glazing is usually only a few volts, so that the DC voltage can also be obtained by intended photovoltaic cells, which are preferably excited by emitted from the light bulbs. Preferably, the photovoltaic cells are arranged in the intermediate space and here preferably at the edge between the first and the second plane.

In a likewise advantageous embodiment of the luminaire, the functional layer can be designed as a gasochromic or gaschrome glazing. In a conventional gasochromic glazing, for example, a tungsten oxide layer can be gassed with hydrogen, which turns dark with a large reduction in the transmission rate.

In a preferred embodiment of the luminaire, the functional layer may be a glazing with micromirror arrays (MEMS). As is known, these micromirror arrays can switch from an at least almost transparent state to a specularly reflective state upon application of an electrical voltage.

The present invention will be described below with reference to several in a drawing illustrated embodiments explained in more detail. In the figures, in each case in a schematic sectional view:

1a a first embodiment of a luminaire with LEDs switched on,

1b the first embodiment of the luminaire, but with the OLED switched on,

2a a second embodiment of the luminaire with the OLED switched on,

2 B the second embodiment of the luminaire with OLED switched on and LEDs switched on,

4a a third embodiment of the lamp with first secondary optics and with LEDs switched on,

4b A fourth embodiment of the luminaire with first secondary optics and with LEDs switched on,

5 a fifth embodiment of the luminaire with second secondary optics and with the OLED switched on,

6 a detail enlargement VI according to 5

7 a sixth embodiment of the luminaire with LEDs switched on,

8th A seventh embodiment of the luminaire with first and second secondary optics and with LEDs switched on,

9a an eighth embodiment of the luminaire with third secondary optics and with the OLED switched on,

9a the eighth embodiment of the luminaire with OLED switched on and with effective third secondary optics,

10 a ninth embodiment of the luminaire with OLED switched on and with effective third secondary optics,

11a a tenth embodiment of the luminaire with OLED switched on and with third secondary optics,

11b a tenth embodiment of the luminaire with OLED and with effective third secondary optics.

12a an eleventh embodiment of the lamp with OLED and a plurality of curved second planes and

12b an eleventh embodiment of the luminaire with the OLED and a plurality of second layers arranged faccettiert.

In the 1 to 12 are each purely schematic cross-sectional views of various embodiments of a lamp 1 shown. The lamp 1 is each elongated, each with a section of the lamp in the views 1 is reproduced. For the sake of clarity, all components of the lamp 1 , such as lamp body suspension and the like, which are not considered essential to the invention, omitted. Furthermore, only for a better understanding, exemplary only in some places of the lamp 1 Radiation traces drawn in, which are purely qualitative and not to be regarded as complete and which may deviate from possible actual ray trajectories.

The lamp 1 has a lighting arrangement 2 on, the one emitting a directed luminous flux L _g first illuminant 3 and a second illuminant emitting a diffused luminous flux L _d 4 includes. The first light source 3 is with respect to a main radiation direction h of the lamp 1 in front of the second light source 4 is arranged. The first light source 3 is here as a light emitting diode 5 (LED) formed. The second light source 4 is here as transparent laminar organic LED 6 (OLED), which is laminated on a substrate.

In the embodiments of the lamp shown here 1 are each a variety of LEDs 5 on a carrier 7 arranged, with adjacent LEDs 5 are equally spaced from each other. The carrier 7 extends in a first level 8th , Parallel to the first level 8th is the areal OLED 6 arranged in a second level. The carrier is in the embodiment according to 1 formed intransparent and reflective. As in 1b As a result, diffuse luminous flux L _d from the OLED can thereby be shown 6 on the carrier 7 be reflected back with a directional component in the main emission direction h. In 1a is the lighting arrangement 2 with the LED switched on 5 and in 1b with the OLED switched on 6 shown. Due to the directional luminous flux L _{g of} the LEDs 5 can with respect to a not shown here, to the levels 8th . 9 parallel spaced illumination surface, a light pattern with circular areas of greater brightness arise, which are separated by darker areas. By means of the diffused luminous flux L _d from the OLED, these darker areas as well as a further surrounding to the illumination area can be lightened. This counteracts the fatigue of the eyes of a user and enhances his well-being.

In 2a becomes the diffused luminous flux L _{d of} the OLED 6 symbolically illustrated by a variety of light rays. In 2 B becomes the highly directed luminous flux L _{g of} the LEDs 5 symbolized by radially diverging light rays. Notwithstanding the embodiment of the lamp 1 according to 1 , is the embodiment of the luminaire 1 according to 2 with a transparent carrier 7 for the LEDs 5 provided, whereby the proportion of the diffuse luminous flux L _d , the main beam direction h of the OLED 6 is emitted through the transparent support 7 go through and have a background H of the light 1 can illuminate. This can be a contrast-creating effect of the directed luminous flux L _g of the LEDs 5 be further mitigated.

In 4 indicates the form of the lamp 1 a first secondary optic 10 in the form of a lens 11 on, with each LED here 5 a lens 11 assigned. By means of this lens 11 , which is reproduced here only symbolically in the drawing, the directed luminous flux L _g of the LEDs 5 be influenced in terms of its emission angle, so that over this, the light distribution with respect to a spaced, not shown illumination surface can be influenced.

In 4a the lens works 11 focusing in the middle while in 4b in addition to focusing a lateral emission of the LEDs 5 emitted light causes. The embodiment of the lamp 1 according to 5 is the same in 2 trained and additionally has a second secondary optics 12 on, in the main radiation direction h behind the OLED 6 is arranged. The second secondary optics 12 is here as a prism arrangement 13 trained, their prisms 14 extending longitudinally in a rod shape perpendicular to the plane of the drawing. The prism arrangement 13 causes light from the LEDs 5 and the OLED 6 essentially being deflected to the left here. Nevertheless, as in 5 indicated, the basic character of a diffuse luminous flux obtained.

In 6 is a section VI according to 5 with a prism 14 the prism arrangement and the attached OLED 6 shown. For the sake of clarity, here are shown a few beam paths, which illustrate, however, that in the prism 14 irradiated light is predominantly deflected to the left here. The prism arrangement is, as in particular in 6 visible, optically directly to the OLED 6 coupled. Therefore, which is not shown here, the prism arrangement at the same time serve as a carrier for the OLED.

In the two embodiments of the lamp 1 according to the 7 respectively. 8th is a combination of the first secondary optics 10 with the second secondary optics 12 shown. According to 7 has the first secondary optics 10 as the embodiment according to 4a , Lenses 11 on, each with a lens 11 an LED 5 assigned. That by means of the lens 11 concentrated light is transmitted through the second secondary order which follows in the main emission direction h 12 in the form of the prism arrangement 13 here distracted to the left.

In 8th is the first secondary optics as a reflector 15 formed, whereby in a known manner, a concentration of the directed luminous flux L _{g of} the LED 5 he follows.

In the embodiments of the luminaire 1 according to the 9 to 11 is a third secondary optic 16 intended. The third secondary optics 16 indicates in all embodiments of the lamp 1 a functional layer 17 on. The functional layer 17 is in the embodiments of the luminaire 1 according to 9 and 10 in the main emission direction h in front of the carrier 7 arranged on the same while the functional layer 17 in the embodiment of the luminaire 1 according to 11 between the bulbs 3 . 4 on the OLED 6 is applied.

In 9 For example, the functional layer has a micromirror array with micromirrors which is not specifically shown here and which is distributed adjacent to one another over the entire functional layer. These micromirrors, which are not shown here, are arranged in a first position approximately parallel to the main beam direction h and essentially allow the diffused luminous flux L _d emitted by the OLED to pass through (FIG. 9a ). Here is the carrier 7 for the LEDs 5 also transparent. According to 9b becomes the diffused luminous flux L _{d of} the OLED 6 at the functional layer 17 reflected by the micromirror not shown here are aligned as a result of an applied electrical voltage perpendicular to the main radiation direction h.

In the 10 and 11 is in each case an embodiment of the lamp 1 with one as electrochromic glazing 18 trained functional layer 17 shown. By means of electrochromic glazing 18 the light transmission or the transmission can be changed depending on the applied DC voltage and / or diffused diffused. According to 10 is the electrochromic glazing 18 formed to scatter the striking light, while the electrochromic glazing 18 according to 11 causes a darkening with a color shift of the light towards the blue. This will be in 11b symbolized by dashed arrows. Furthermore, as in 10 indicated a part of the light on the electrochromic glazing 18 be reflected.

In the 12a and 12b , in each case one embodiment of the luminaire 1 with the OLED switched on 6 and a plurality of curved second levels 9 , which form here a sinusoidal cross-sectional profile, or a plurality of planar second planes 9 shown here form a sawtooth cross section profile. Here is every second level 9 an OLED 6 assigned. In the 12a and 12b Alternatively, in each case a luminaire with only one QLED can be represented, which are formed in a sinusoidal cross-sectional profile or in a Sägezahnquerschnittsprofil. A support provided here for the OLEDs 6 is not shown here to simplify the drawing.

LIST OF REFERENCE NUMBERS

1

lamp

2

Lamp positioning

3

first light source

4

second light source

5

LED

6

OLED

7

carrier

8th

first floor

9

second level

10

first secondary optics

11

lens

12

second secondary optics

13

prism assembly

14

prism

15

reflector

16

third secondary optics

17

functional layer

18

electrochromic layer

H

Boresight

H

background

L _g

directed luminous flux

L _d

diffuse luminous flux

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009014873 U1 [0003]

Claims (11)

Luminaire with a lighting arrangement ( 2 ) which emits a first luminous means (L _g ) emitting a directed luminous flux (L _g ) 3 ) and a diffuse luminous flux (L _d ) emitting second light source ( 4 ), characterized in that the first lighting means ( 3 ) with respect to a main emission direction (h) of the luminaire ( 1 ) in front of the second illuminant ( 4 ) is arranged. Luminaire according to claim 1, characterized in that the first lighting means ( 3 ) an LED and / or the second illuminant ( 4 ) a transparent planar OLED ( 6 ). Luminaire according to claim 1 or 2, characterized in that a plurality of first lighting means ( 3 ) provided in a first level ( 8th ) are arranged, and the second light source ( 4 ) in a second plane ( 9 ). Luminaire according to claim 3, characterized in that the two levels ( 8th . 9 ) are arranged at least approximately parallel to each other Luminaire according to claim 3 or 4, characterized in that the first lighting means ( 3 ) on a in the first level ( 8th ) extending carrier ( 7 ) are arranged, which is at least substantially transparent or at least substantially intransparent and reflective. Luminaire according to one of claims 1 to 5, characterized in that it has a secondary optics arrangement for directing the light and / or filtering the light from the light sources ( 3 . 4 ) emitted light. Luminaire according to claim 6, characterized in that the secondary optics assembly a first secondary optics ( 10 ) for the first light source ( 3 ) in the form of a lens ( 11 ) and / or a reflector ( 15 ), wherein the first secondary optics ( 10 ) in the main emission direction (h) of the luminaire ( 1 ) behind the first light source ( 3 ) is arranged. Luminaire according to one of claims 6 or 7, characterized in that the secondary optics arrangement a second secondary optics ( 12 ) for the second light source ( 4 ) in the form of a prism arrangement ( 13 ), wherein the second secondary optics ( 12 ) in the main emission direction (h) in front of and / or behind the second illuminant ( 4 ) is arranged. Luminaire according to claim 8, characterized in that the prism arrangement ( 13 ) laterally at least almost over the entire second light source ( 4 ). Luminaire according to one of claims 6 to 9, characterized in that the secondary optics assembly a third secondary optics ( 16 ), which in the main emission direction (h) before and / or behind the first lighting means ( 3 ) and at least one optically active functional layer ( 17 ) having. Luminaire according to claim 10, characterized in that the functional layer ( 17 ) an electrochromic glazing ( 18 ), a gasochromic glazing and / or a glazing with a micromirror array.

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