EP3396242B1 - Spotlight, spotlight system and workplace with same - Google Patents

Description

Technical area

The invention relates to a light emitter for generating a stream of visible light to a room ceiling according to the preamble of claim 1 as well as a light emitter system with at least one such light emitter and a work station furniture with such a light emitter. Such light emitters with a lamp for generating artificial light in the visible range and optics that are designed to form the flow of visible light from the light generated by the lamp can be used to irradiate and open walls and ceilings of rooms this way to illuminate rooms.

State of the art

To illuminate rooms and workplaces, luminaires are used nowadays in different designs adapted to the respective application purpose. Most of the time, attempts are made to use the luminaires to generate light distribution curves that allow the best possible illumination when the luminaires are used as intended.

Among other things, it is known to use lights that indirectly illuminate rooms. In addition, the luminaires shine light on ceilings and / or walls and create lighting that is often perceived as pleasant. For example, in the U.S. 4,386,392 A and in the U.S. 4,218,727 A Luminaires for indirect lighting of rooms shown above their ceilings.

Standing lamps are also often used in offices to illuminate workplaces such as desks. Such lights can in part enable good illumination of individual workplaces, but they can and will impair the use of the room often perceived as annoying. In particular, such lights typically have to be set up close to a workstation for the best possible illumination of a workstation, which is often undesirable and, above all, impractical in the case of workstations that change regularly.

As an alternative or in addition to this, ceiling lights are also used, from which the workplaces are illuminated. For example, it is known to provide surface lights that are suspended from a room ceiling or built into a room ceiling and that specifically illuminate one or more workplaces. Such surface lights can be designed to be relatively small and focused, or they can also be designed to be larger and wider.

Although workplaces can be preferentially illuminated by means of such ceiling lights, and although such lights are relatively less disruptive because they are not located in places where other things are placed or people are, they are still relatively inflexible. In particular in the case of regularly changing workplaces, for example in offices in which, for example, workstation groups are formed depending on the project, such ceiling lights are usually too inflexible because they have to be moved, realigned and configured. Such ceiling lights are also often undesirable for interior design, since they are typically permanently installed and therefore cannot be redesigned.

The object of the following invention is therefore to propose a system or components of a system which enables or enables a flexibly adaptable and configurable, specific illumination of workplaces in a room.

Presentation of the invention

The object is achieved according to the invention by a light emitter as defined by the features of independent claim 1, as well as by a light emitter system as defined by the features of claim 12, and workstation furniture as defined by the features of claim 15 is. Advantageous variant embodiments of the invention emerge from the dependent claims.

The essence of the invention consists in the following: A light emitter for generating a stream of visible light on a room ceiling, comprises a lighting means for generating artificial light in the visible range and optics. The optics are designed to shape the flow of visible light from the light generated by the illuminant. It is also designed to define a light distribution curve of the light generated by the lighting means in such a way that a luminaire object with a homogeneous luminance can be generated on the ceiling of the room.

In connection with the invention, the term “light distribution curve” is understood to mean a characterization of the light emitted by a lamp, which can be represented in a graphic. The light intensities of the luminaire in their different radiation directions are connected to one another to form a curve. The light distribution describes the spatial distribution of the light. The shape and symmetry of the light distribution characterize a depth or width and a symmetry of the radiation.

The term "luminaire object" as used in connection with the invention relates to a homogeneous, closed light surface with a defined boundary or sharp edges. The luminaire object can have any shape on the ceiling. In particular, it can be round or polygonal on the ceiling and designed as a spot, for example. The term "defined limit" in this context means a decrease in the luminance on the ceiling to a maximum of 10%, a maximum of 5% or almost 0%, which occurs over a maximum of about 30% of a diameter of the luminaire object or a central zone thereof. The central zone can be an area of the luminaire object that cannot be assigned to the defined border, i.e. a border zone. In the case of non-circular shapes of the luminaire object, the diameter can be an approximate diameter. For example, in the case of a square shape, it can correspond to a diagonal of the square. In this context, the term "sharp edge" is understood to mean a decrease in luminance by at least about 20%, at least about 25%, at least about 30%, at least about 40% or at least about 50%, preferably to about 0%, this decrease being over a maximum of about 10% of the diameter of the luminaire object or a central zone thereof takes place.

In connection with the invention, the term "luminance" (Lv) relates to the brightness of the luminous object on the ceiling, which acts as an extensive, two-dimensional light source. It can provide information about the location and direction of the light emitted by the luminaire object. The term "homogeneous luminance" refers to the fact that the brightness is essentially the same over the surface of the luminaire object. In this context, “essentially the same” can be understood to mean that the brightness in the area of the luminaire object on the ceiling does not change by more than about 30% or about 20% or about 10% or about 5% or about 3%.

The light emitter can in particular be provided to emit light from bottom to top, in particular to a ceiling. It can be implemented in a relatively compact and light manner, for example as a stele or light stele.

The term "ceiling" can refer to an upper boundary of a room. Room ceilings are not necessarily but typically horizontally aligned. They can be formed by plastered masonry, panels, stretched textile materials, metals or the like. The room ceiling can be the ceiling of a closed or open room.

The term “stream of visible light”, which is also referred to here simply as “luminous flux” or “beam”, refers to visible light that is emitted by the light emitter. The luminous flux or beam can be a bundle of rays, a bundle of rays being understood to mean a number of light rays which run exactly or approximately parallel to one another or also predominantly in a similar direction. In particular, the luminous flux can also have an angle of spread, as typically occurs with point light sources.

The fact that the light emitter according to the invention is designed to define a light distribution curve of the light generated by the illuminant for generating the luminaire object on the ceiling enables targeted illumination to be achieved in an efficient manner. In particular, the generated luminaire object can specifically illuminate a workplace on the ceiling. In this context, the term "workplace" can refer to a typically horizontal or quasi-horizontal surface on which certain activities are carried out. For example, the workplace can be a table surface and in particular one Surface of an office or desk. Or it can be an area of a room with or without one or more tables. For example, it can comprise a flexibly assembled group of desks, such as is assembled, for example, for collaboration in a project. It can also only be part of a table such as a conference table in a meeting room. In this context, the term "targeted illumination" can refer to the generation of a preferred LID by the luminaire object, that is to say a luminaire object LID. In particular, the workplace should be sufficiently illuminated and glare should be avoided. The targeted illumination does not create illumination of the workplace via basic lighting in the room, but rather specific illumination of the workplace that is independent of the basic lighting. Typically, the illumination of the workplace differs from the general lighting of the room. For example, the workplace should often be lit brighter to allow comfortable reading and writing or working.

The light emitter makes it possible to use the luminaire object to create a virtual luminaire or a dematerialized luminaire on the ceiling of the room. The quality of the ceiling can be included. In connection with the room ceiling, the term "texture" can relate to a composition of the room ceiling, its color, texture or the like. In particular, the nature of the ceiling can define its reflection properties and its radiation characteristics. The ceiling of the room can be designed in various ways in order to be suitable for producing the luminaire object. For example, the room ceiling can be a mirror ceiling or contain mirrors. With such a ceiling, the luminous flux can be used relatively directly and unchanged to generate the luminaire object, so that the luminaire object itself can emit a directed luminous flux. Or the ceiling of the room can be equipped with a lime plaster, which enables the creation of a luminaire object that emits comparatively diffuse light.

The light emitter according to the invention enables the ceiling itself to be used efficiently as a component of a lighting system in order to illuminate the workplace. The creation of a virtual lamp with the light emitter according to the invention enables great flexibility in the lighting and design of Jobs. For example, in rooms in which the workplaces change regularly, targeted lighting can be used that can be adapted to changes with relatively little effort. For example, it can be prevented that ceiling lights have to be moved around and / or standing or standing lights have to be rearranged in order to enable the individual workplaces to be illuminated in each case when the conditions change. Rather, a workstation at a different location in the room can be re-lit with or without realigning and possibly re-adjusting the light emitter.

In addition, the light emitter according to the invention enables new possibilities in room design. The virtual luminaire can be perceived as a built-in luminaire without actually having to be installed. The light emitter also enables workplaces to be appropriately illuminated in rooms in which it is not possible to incorporate or mount a light in or on the ceiling of the room. For example, the light emitter can be used to create ceiling lights on room ceilings that are not powerful enough for installation, that are insufficiently stable for installation or extension or that may not be changed, for example for reasons of monument preservation. There is also no need for an electrical connection on the room deck. In addition, the light emitter can also be advantageous for relatively low room heights, since no structures protrude from the ceiling.

Compared to known lighting systems with floor lamps, a lighting system implemented by means of the light emitter according to the invention can have the following advantages: The lights or the light emitters can be designed relatively flexibly, since no large lamp head is necessary. The system can be advantageous in terms of material expenditure. The indirect lighting via the ceiling can be perceived as particularly pleasant. Light graphics can also be generated. With the lighting system, self-adaptive lighting of workplaces, as explained below, for example, can be implemented in real time without having to make adjustments. The lighting system can be preferred when designing the room, since no stands or larger lighting objects have to be set up in the room. No shadow is created by direct light. The light produced can give the impression of Come close to daylight, which is often perceived as pleasant. Maintenance and assembly can be relatively simple.

The light emitter according to the invention thus enables flexible, adaptable and configurable, specific illumination of workplaces in a room in a preferred quality.

The light emitter is preferably designed so that the homogeneous luminance of the luminaire object is a maximum of approximately 1,500 Cd / m ² , a maximum of approximately 2,500 Cd / m ² or a maximum of approximately 3,000 Cd / m ² . With such a luminance, preferred illumination of the workplace can be achieved in many applications. In particular, this luminance can provide a surface brightness that is perceptible to the eye of a beholder and that makes the entire luminaire object appear as a single surface. As a result, the luminaire object can act and appear as a surface luminaire.

The optics are preferably designed so that a brightness in an area of the luminaire object on the ceiling changes by less than about 30%, less than about 20%, less than about 10%, less than about 5% or less than about 3%. In this way, the luminance can preferably be homogeneous, so that the luminaire object can appear and work flat.

The LID of the light emitter preferably has a greater light intensity between approximately 120 ° and approximately 170 ° and in particular at approximately 150 ° or approximately 165 ° than at 180 °. In particular, the LID of the light emitter preferably has a maximum light intensity between approximately 120 ° and approximately 170 ° and in particular at approximately 150 ° or 165 °. With such a LID, a homogeneous luminance can be efficiently generated in the luminaire object. The LID of the light emitter is preferably symmetrical. The light emitter can thus be directed essentially upwards.

According to the invention, the optics are designed to shape the light generated by the illuminant in such a way that the flow of visible light has a focal point that is spaced apart from the illuminant in a direction of radiation. The term "emission direction" can refer here to a main direction in which the light beam generated by the light emitter or the beam propagates. In particular, it can run along the axis of the beam.

The focal point of the flow of visible light is spaced from the optics in the direction of emission. Such a light emitter enables the generation of a so-called cross beam, i.e. a light beam with a taper or waist. This enables the beam or light beam to first expand relatively far from the illuminant. As a result, a comparatively compact beam can be achieved, which can be advantageous, for example, to prevent glare effects or to reduce scattered light.

The light emitter preferably comprises a screen through which the flow of visible light can be conducted. With such a screen, stray light can be intercepted. Glare or glare effects can also be reduced. The diaphragm is preferably positioned in such a way that it can be arranged further away from the illuminant than the focal point of the flow of visible light when the illuminant generates light. As a result, the scattered light can be intercepted particularly efficiently and glare can be reduced. The term "remotely arranged" also includes embodiments in which the screen extends from closer to the illuminant to further away from the illuminant. It is important that an effective part of the screen is further away from the lamp than the end of the optics that is remote from the lamp or a transparent cover as described below.

The diaphragm preferably comprises a sleeve section through which the stream of visible light passes when the illuminant generates light. Such a sleeve section can enable the diaphragm to be implemented in a simple and efficient manner. The sleeve section of the screen is preferably designed to be light-absorbing on its inside.

The diaphragm is preferably adjustable. Such a screen enables glare control adapted to the specific use of the luminaire to be implemented. For example, in the case of a light emitter arranged relatively far below, the aperture can be set relatively high so that glare control is effective for people around the light emitter. Such a light emitter can therefore be used flexibly in various different applications.

In this case, a distance between the optics and the diaphragm is preferably adjustable along an emission direction. This enables the anti-glare effect of the diaphragm to be set efficiently, in particular if it has a sleeve-shaped section.

The light emitter preferably comprises a sensor with which an illuminance of the light diverted back from the ceiling to the light emitter can be detected. In this case, the light emitter preferably comprises an adjusting device which is designed to automatically adjust the lighting means in such a way that the illuminance detected by the sensor has approximately a predefined value. With such a light emitter it can be achieved that the luminaire object generated by it always illuminates an area around the light emitter with approximately the same intensity. If the light emitter is moved, for example to a place with a higher ceiling, the light emitter is automatically or manually readjusted until the illuminance has the predefined value again. This enables the light emitter to be used flexibly and efficiently in changing applications.

The predefined value can be at least about 300 lux or at least about 500 lux. Such illuminance levels are typically desired or preferred for illuminating workplaces and, in particular, office workplaces.

The light emitter preferably has a transparent cover through which the stream of visible light emerges from the light emitter when the illuminant generates light. The cover can serve as dust protection, which can be advantageous in particular for generating a light beam or beam from bottom to top, since otherwise dust and other particles can get into the interior of the light emitter. The cover is advantageously anti-reflective.

The light emitter preferably comprises a joint on which the optics and the illuminant are mounted so that the flow of visible light can be directed. Such a joint enables a simple and efficient alignment of the light beam or beam. The light emitter further preferably comprises a foot by means of which it can be set up on a floor. The term "floor" in this context can refer to any surface on which the light emitter should be set up. In particular, it can be a floor or a table surface such as a workplace.

The illuminant is preferably an LED illuminant with at least one light-emitting diode and in particular a COB-LED illuminant, a CSP-LED illuminant, an LED laser or an LED array. In this context, the acronym "COB" stands for Chip On Board. The acronym "COB" means a technology in which unhoused semiconductor chips are mounted directly on circuit boards to form an electronic assembly. The acronym "LED" stands for Light Emitting Diode. The acronym "CSP" stands for Chip Scale Package. This can be understood as a chip housing for integrated circuits, the housing being able to make up a maximum of 20% more area than the die. For this purpose, the connections for assemblies can be connected to the die without bonding. LED light sources can be beneficial for many reasons. For example, they are comparatively energy-efficient, so that the light emitter can have a comparatively high degree of effectiveness. They are also precisely configurable so that light adapted to an application can be generated efficiently. They are also comparatively durable. In particular, CSP-LED lamps also enable a relatively small overall size, so that the lamp can be comparatively small.

The illuminant is preferably designed in such a way that a luminous flux of the light generated by it is at least about 5,000 lumens or at least about 7,000 lumens and in particular between 9,500 lumens and 20,000 lumens or about 12,500 lumens or about 15 '' Has 500 lumens. Such a luminous flux enables the luminaire object to be produced, as is preferred in many applications. In particular, a luminaire object can be created that is suitable for illuminating workplaces in offices.

The light emitter preferably comprises a presence sensor and a switch-off unit. The presence sensor is aligned in the direction of emission of the light emitter. The switch-off unit is designed to automatically switch off the lighting means on the basis of a signal generated by the presence sensor. Such a light emitter with a presence sensor and switch-off unit enables the light emitter to be switched off or dimmed immediately and automatically as soon as a person or an object is in front of it. This can For example, a person can be prevented from being dazzled by the light emitter and possibly even being harmed as a result. In this way, the safety and comfort of the light emitter can be improved during operation.

The light emitter preferably comprises a direct light illuminant for generating artificial light in the visible range and direct light optics which are designed to generate a direct light that is quasi turned away from the flow of visible light from the light generated by the direct light illuminant. In the case of a vertically oriented light emitter, the flow of visible light can thus be directed upwards towards the ceiling and the direct light downwards towards a workplace, for example. This enables the workplace or a specific area thereof to be or can be ideally or additionally illuminated in a special way.

The direct light optics are preferably designed to define a light distribution curve of the direct light generated by the direct light illuminant in such a way that a workstation can be illuminated. There may be special guidelines or other requirements for workplaces that must be adhered to. With such direct light optics, these can be met efficiently.

The direct light optics are preferably designed in a segmented manner, so that they define a light distribution curve of the direct light generated by the direct light illuminant in such a way that several workplaces can be illuminated separately. The direct light optics can, for example, have two, three or four segments. In this way, a corresponding number of workplaces can be specifically illuminated at the same time. The direct light optics can be designed in one piece or also in several parts.

The light emitter preferably has a control with which the illuminant and the direct light illuminant can be controlled independently. In this way, the two illuminants can be set separately from one another and the light emitter can be set specifically for its intended application. In a simple embodiment, the control is a switch with which the direct light illuminant can be switched on or off. For example, direct light can be switched on when required at a workstation, for example for reading without using a screen, whereas the usual illumination of the workstation takes place via the luminaire object.

Another aspect of the invention relates to a light emitter system with a light emitter as described above and a sensor unit that can be placed independently of the light emitter. The sensor unit has a sensor with which an illuminance of the light diverted from the ceiling to a target location can be detected.

With such a light emitter system, the effects and advantages described above in connection with the light emitter according to the invention and its preferred embodiments can be achieved efficiently. In addition, the sensor unit enables the illuminance to be recorded at a target location such as a workstation that is independent of the light emitter.

In this case, the light emitter preferably comprises a communication interface and an actuating device and the sensor unit a communication interface. The communication interface of the light emitter and the communication interface of the sensor unit are designed to transmit signals detected by the sensor of the sensor unit to the light emitter. The adjusting device of the light emitter is designed to automatically adjust a lighting means of the light emitter on the basis of the signal received from the sensor unit in such a way that the illuminance has approximately a predefined value.

With such a light emitter system, it can be achieved that the generated luminaire object always illuminates an area around the sensor unit, which can be arranged, for example, on a workstation, with approximately the same intensity. If the light emitter or the workstation is relocated, which happens regularly, for example, with height-adjustable desks, the light emitter is automatically or manually readjusted until the illuminance has the predefined value again.

The predefined value can be at least about 300 lux or at least about 500 lux. Such illuminance levels are typically desired or preferred for illuminating workplaces and, in particular, office workplaces.

The light emitter system preferably comprises a multiplicity of light emitters. With such a light emitter system, several workplaces can be illuminated in a coordinated and coordinated manner.

Another further aspect of the invention relates to workstation furniture which is equipped with a light emitter as described above. The workplace furniture can in particular be a table or a desk or a meeting table. With such a workstation furniture, the effects and advantages described above in connection with the light emitter according to the invention and its preferred embodiments can be achieved efficiently. In particular, the work station itself can include the lighting. Among other things, the spotlight can be moved or wandered with the workplace or office table. As a result, the luminaire object on the ceiling of the room is also moved with it, and appropriate lighting can be provided regardless of where the workplace is positioned in the room. This enables extremely flexible and simple lighting of workplaces.

Brief description of the drawings

Fig. 1

eine Seitenansicht eines ersten Ausführungsbeispiels eines erfindungsgemässen Lichtstrahlersystems mit einem ersten Ausführungsbeispiel eines erfindungsgemässen Lichtstrahlers;

Fig. 2

eine vergrösserte Teilseitenansicht des Lichtstrahlers von Fig. 1;

Fig. 3

eine Lichtverteilungskurve des Lichtstrahlers von Fig. 1;

Fig. 4

eine Seitenansicht eines zweiten Ausführungsbeispiels eines erfindungsgemässen Lichtstrahlersystems mit einem zweiten Ausführungsbeispiel eines erfindungsgemässen Lichtstrahlers;

Fig. 5

eine Lichtverteilungskurve des Lichtstrahlers von Fig. 4;

Fig. 6

eine Seitenansicht eines dritten Ausführungsbeispiels eines erfindungsgemässen Lichtstrahlersystems mit einem dritten Ausführungsbeispiel eines erfindungsgemässen Lichtstrahlers;

Fig. 5

eine Lichtverteilungskurve des Lichtstrahlers von Fig. 6.

Further advantageous embodiments of the invention emerge from the following description of exemplary embodiments of the invention with the aid of the schematic drawing. In particular, the light emitter according to the invention and the light emitter system according to the invention are described in more detail below with reference to the accompanying drawings using exemplary embodiments. Show it:

Fig. 1

a side view of a first embodiment of a light emitter system according to the invention with a first embodiment of a light emitter according to the invention;

Fig. 2

an enlarged partial side view of the light emitter of FIG Fig. 1 ;

Fig. 3

a light distribution curve of the light emitter of Fig. 1 ;

Fig. 4

a side view of a second embodiment of a light emitter system according to the invention with a second embodiment of a light emitter according to the invention;

Fig. 5

a light distribution curve of the light emitter of Fig. 4 ;

Fig. 6

a side view of a third embodiment of a light emitter system according to the invention with a third embodiment of a light emitter according to the invention;

Fig. 5

a light distribution curve of the light emitter of Fig. 6 .

Weq (e) for carrying out the invention

Certain terms are used in the following description for reasons of convenience and are not to be understood as restrictive. The words "right", "left", "down" and "up" indicate directions in the drawing to which reference is made. The terms "inward", "outward", "below", "above", "left", "right" or the like are used to describe the arrangement of designated parts with respect to one another, the movement of designated parts with respect to one another and the directions towards or away from Geometric center of the invention and named parts thereof as shown in the figures. Used. These relative spatial information also include positions and orientations other than those shown in the figures. For example, when a part shown in the figures is turned over, elements or features described as "below" are then "above". The terminology includes the words expressly mentioned above, derivatives from them, and words with similar meanings.

The omission of an aspect in the description or a figure does not imply that this aspect is absent in the associated exemplary embodiment. Rather, such an omission can serve the purpose of clarity and to prevent repetition. Similar reference numbers in two or more figures stand for similar or identical elements.

In order to avoid repetition in the figures and the associated description of the various aspects and exemplary embodiments, certain features are to be understood as common for different aspects and exemplary embodiments. The omission of an aspect in the description or a figure does not imply that this aspect is absent in the associated exemplary embodiment. Rather, such an omission can serve the purpose of clarity and to prevent repetition. In this context, the following definition applies to the entire further description: If reference numerals are included in a figure for the purpose of graphic clarity, but in the directly associated one Descriptive text is not mentioned, reference is made to its explanation in the preceding figure descriptions. If, in addition, reference symbols are mentioned in the descriptive text that belongs directly to a figure and are not contained in the associated figure, reference is made to the preceding and following figures. Similar reference numbers in two or more figures stand for similar or identical elements.

Fig. 1 shows a first embodiment of a light emitter system 2 according to the invention, which is set up in an office with a ceiling 5 and a desk. An upper side of a table top of the desk forms a work station 4.

The light emitter system 2 comprises a first exemplary embodiment of a light emitter 1 and a sensor unit 3 that can be positioned independently of the light emitter 1 The base plate 11 is set up on the table top or on the work station 4. The light emitter 1 is aligned upwards towards the ceiling 5.

As in Fig. 2 As can be seen, the light emitter 1 comprises a COB-LED illuminant 16 as illuminant, which is mounted in the area of a base of the reflector 12 and which can emit a luminous flux of approximately 12,500 lumens. The reflector 12 is shaped, as it were, as a sleeve with parabolic inner surfaces and is penetrated by the light emitted by the COB-LED illuminant 16. The reflector 12 is designed to form a stream of visible light or a luminous flux 41 or a beam from the light generated by the COB-LED lamp 16. The luminous flux 41 has a focal point 411 which is spaced upwardly from the COB-LED illuminant 16 in an emission direction 161.

The diaphragm 13 can be adjusted upwards and downwards along the emission direction 161. It comprises a substantially sleeve-shaped section which is penetrated by the luminous flux 41 and which absorbs light on its inside. In the in Fig. 2 The setting shown here lies the focal point 411 of the luminous flux 41 in the sleeve-shaped section and is thus covered by the diaphragm 13. The aperture 13 thus intercepts scattered light of the luminous flux 41 and glare-free the light emitter 1 adapted to the respective application.

The light emitter 1 further comprises a presence sensor 19 and a switch-off unit. The presence sensor 19 is aligned in the emission direction 161 and the switch-off unit is designed to automatically switch off the lighting means 16 on the basis of a signal generated by the presence sensor 19.

The reflector 12 is designed to produce a light distribution curve 6 of the light generated by the COB-LED lamp 16, as in FIG Fig. 3 to define represented. In particular, the LVK 6 has a greater light intensity on both sides at around 165 ° than at 180 °. It has a maximum light intensity at around 165 °.

As in Fig. 1 As can be seen, the luminous flux 41 generates a virtual luminaire object 51 on the room ceiling 5. By means of the LVK 6, it is achieved that the luminaire object 51 has a homogeneous luminance. The homogeneous luminance of the luminaire object 51 is a maximum of approximately 3,000 Cd / m ² . A brightness in the area of the lighting object 51 changes by less than 3%. The luminaire object 51 itself in turn emits light 42, which corresponds to the reflected light of the luminous flux 41, in the direction of the workplace 4. The light 42 of the luminaire object 51 illuminates the workplace 4.

The sensor unit 3 arranged on the workstation 4 comprises a first communication interface and a sensor with which an illuminance of the light 42 or the light 42 of the luminaire object 51 diverted from the ceiling 5 to the workstation 4 is detected. The light emitter 1 is equipped with a second communication interface and an actuating device. Signals detected by the sensor of the sensor unit 3 can be transmitted to the light emitter 1 via the second communication interface and the first communication interface. The adjusting device of the light emitter 1 automatically adjusts the COB-LED lamp 16 based on the signals received from the sensor unit 3, so that the illuminance has a predefined minimum value at the workplace 4 of approximately 500 lux.

The light emitter 1 also has a transparent cover 17 which covers the reflector 12 towards the top. In operation, the luminous flux 41 is passed through the cover 17 after passing through the reflector 12.

The light emitter 1 further comprises a further sensor 15 which is placed on the base plate 11 and with which the illuminance of the light 42 of the luminaire object 51 is detected. The adjusting device of the light emitter 1 automatically adjusts the COB-LED lamp 16 on the basis of signals detected by the further sensor 15, so that the illuminance has the predefined minimum value of approximately 500 lux. The further sensor 15 supplements the sensor unit 3 and the two can optionally be switched on and off.

Fig. 4 shows a second embodiment of a light emitter system 20 according to the invention with a second embodiment of a light emitter 10. The light emitter system 20 is set up in an office with a ceiling 5 and a desk. An upper side of a table top of the desk forms a work station 40. The light emitter 19 is designed as a floor lamp with a leg 150 having a foot.

The light emitter 10 has a lamp body 130 carried by the leg 150 which, in terms of lighting technology, is similar to that of the first light emitter from FIG Fig. 2 is trained. In particular, it comprises an upper COB LED lamp as a lamp which can emit a luminous flux of around 12,500 lumens upwards via an upper reflector, a lower LED lamp as a direct light lamp and a lower reflector assigned to the lower LED lamp as a direct light optics, which together can emit direct light 430 downwards. The luminaire body 130 is also equipped with an upper reflector which is designed to form a stream of visible light or a luminous flux 410 or a beam from the light generated by the upper COB-LED lamp. The luminous flux 410 is directed upwards towards the ceiling 51.

The reflector and the lower reflector are designed to create a light distribution curve 60 of the light generated by the COB-LED illuminant and the LED illuminant, as in FIG Fig. 5 to define represented. In particular, the LVK 60 has an indirect light component 610 and a direct light component 620. The indirect light component 610 describes a greater light intensity on both sides at around 165 ° than at 180 °. Of the The direct light component 620 is virtually the opposite of the indirect light component 610. It describes a greater light intensity on both sides at around 40 ° than at 0 °. The maximum light intensity of the entire LVK 60 in the indirect light portion 610 is around 165 ° on both sides.

As in Fig. 4 As can be seen, the luminous flux 410 generates a virtual luminaire object 510 on the room ceiling 50. By means of the LVK 60 it is achieved that the luminaire object 510 has a homogeneous luminance. The homogeneous luminance of the luminaire object 510 is a maximum of around 3,000 Cd / m ² . A brightness in the area of the lighting object 510 changes by less than 3%. The luminaire object 510 itself in turn emits light 420, which corresponds to the reflected light of the luminous flux 410, downwards. The direct light 430 radiates downwards and evenly illuminates the workplace in an illuminated area 440.

In Fig. 6 a third embodiment of a light emitter system 29 according to the invention with a third embodiment of a light emitter 19 is shown. The light emitting system 29 is similar to the light emitting system 20 of FIG Fig. 4 formed with a lamp body 139 having a lamp, a direct light lamp and associated reflectors. It is arranged in an office with a ceiling 50 and a workplace 49.

As in Fig. 7 As can be seen, the upper illuminant and the associated upper reflector are designed to generate an indirect light component 619 of an LVK 69, which is designed analogously to the indirect light component 610 of the LVK 60 of the light emitter 20. The lower illuminant or the direct light illuminant and the associated lower reflector, on the other hand, are arranged in such a way that an asymmetrical direct light component 629 of the LVK 69 is generated. The direct light component 629 is only directed to the right and has a maximum at almost 60 °.

As in Fig. 6 As can best be seen, this configuration of the LVK 69 allows, on the one hand, basic lighting in the room and, on the other hand, an illuminated surface 449 to be produced at an angle on the workstation 49. This allows the light emitter 19 to be set up laterally next to the illuminated area 449 on the work station 49. The light emitter 19 is equipped with a table base 159 for this purpose.

Although the invention is illustrated and described in detail by means of the figures and the associated description, this illustration and this detailed description are to be understood as illustrative and exemplary and not as limiting the invention. In order not to clarify the invention, in certain instances well-known structures and techniques may not have been shown and described in detail. It is understood that those skilled in the art can make changes and modifications without departing from the scope of the following claims. In particular, the present invention covers further exemplary embodiments with any combination of features that may differ from the combinations of features explicitly described.

The present disclosure also encompasses embodiments with any combination of features that are mentioned or shown above or below for various embodiments. It also includes individual features in the figures, even if they are shown there in connection with other features and / or are not mentioned above or below. The alternatives of embodiments and individual alternatives of their features described in the figures and the description can also be excluded from the subject matter of the invention or from the disclosed subject matter. The disclosure includes embodiments that exclusively include the features described in the claims or in the exemplary embodiments, as well as those that include additional other features.

In the following, the term “comprise” and derivatives thereof do not exclude other elements or steps. Likewise, the indefinite article “a” or “an” and its derivatives do not exclude a large number. The functions of several features listed in the claims can be fulfilled by one unit or one step. The terms “essentially”, “about”, “approximately” and the like in connection with a property or a value also define, in particular, precisely the property or precisely the value. The terms "about" and "approximately" in connection with a given numerical value or range can refer to a value or range that is within 20%, within 10%, within 5% or within 2% of the given value or range. All reference signs in the claims are not to be understood as limiting the scope of the claims.

Claims (15)

1. Spotlight (1) for generating a visible light stream (41) on a ceiling (5), comprising an illuminant (16) for generating artificial light in the visible range and an optical member (12) adapted to shape the visible light stream (41) from the light generated by the illuminant (16), the optical member (12) being designed to

   define a light distribution curve (6) of the light generated by the illuminant (16) in such a way that a lighting object (51) having a homogeneous luminance density can be generated on the ceiling (5), characterized in that the optical member (12) is designed to

   shape the light generated by the illuminant (16) in such a way that the visible light stream (41) has a focal point (411) which is spaced apart from the illuminant (16) and the optical member (12) in a radiation direction (161) such that the visible light stream is a cross beam.
2. Spotlight (1) according to claim 1, being configured such that the homogeneous luminance density of the lighting object (51) is at most approximately 1,500 Cd/m², at most approximately 2,500 Cd/m² or at most approximately 3,000 Cd/m².
3. Spotlight (1) according to claim 1 or 2, wherein the optical member (12) is designed such that a brightness in a surface of the lighting object (51) on the ceiling (5) changes by less than approximately 30%, less than approximately 20%, less than approximately 10%, less than approximately 5% or less than approximately 3%.
4. Spotlight (1) according to any one of the preceding claims, wherein the light distribution curve (6) has a maximum brightness between approximately 120° and approximately 170° and in particular of approximately 150° or approximately 165°.
5. Spotlight (1) according to any one of the preceding claims, comprising a sensor (15) with which an illuminance of the light (42) redirected from the ceiling (5) back to the spotlight (1) can be detected, wherein the spotlight (1) preferably comprises an adjusting device which is designed to automatically adjust the illuminant (16) such that the illuminance detected by the sensor (15) has approximately a predefined value.
6. Spotlight (1) according to any one of the preceding claims, comprising a transparent cover (17) through which the visible light stream (41) exits from the spotlight (1) when the illuminant (16) generates light.
7. Spotlight (1) according to any one of the preceding claims, wherein the illuminant (16) is designed such that a light stream of the light generated by the illuminant has at least approximately 5,000 lumens or at least approximately 7,000 lumens and in particular between 9,500 lumens and 20,000 lumens or approximately 12,500 lumens or approximately 15,500 lumens.
8. Spotlight (1) according to any one of the preceding claims, comprising a presence sensor (19) and a switch-off unit, wherein the presence sensor (19) is aligned in a radiation direction (161) of the spotlight (1) and wherein the switch-off unit is designed to automatically switch off the illuminant (16) based on a signal generated by the presence sensor (19).
9. Spotlight (1) according to any one of the preceding claims, comprising a direct light illuminant for generating artificial light in the visible range and a direct light optical member, which are designed to generate, from the light generated by the direct light illuminant, direct light which is quasi averted from the visible light stream (41), wherein the direct light optical member is preferably designed to define a light distribution curve of the direct light generated by the direct light illuminant in such a way that a workplace can be illuminated.
10. Spotlight according to claim 9, wherein the direct light optical member is segmented such that it defines a light distribution curve of the direct light generated by the direct light illuminant in such a way that a plurality of workplaces can be illuminated separately.
11. Spotlight according to claim 9 or 10, comprising a control with which the illuminant (16) and the direct light illuminant can be controlled independently.
12. Spotlight system having a spotlight (1) according to any one of the preceding claims and a sensor unit (3) which can be placed independently of the spotlight (1), wherein the sensor unit (3) has a sensor with which an illuminance of the light (42) redirected from the ceiling (5) to a destination can be detected.
13. Spotlight system according to claim 12, wherein the spotlight (1) comprises a communication interface and an adjusting device and wherein the sensor unit (3) comprises a communication interface,

    the communication interface of the spotlight (1) and the communication interface of the sensor unit (3) being designed to transmit signals detected by the sensor of the sensor unit (3) to the spotlight (1), and

    the adjusting device of the spotlight (1) being designed to automatically adjust an illuminant (16) of the spotlight (1) based on the signals received by the sensor unit (3) such that the illuminance has approximately a predefined value.
14. Spotlight system according to claim 12 or 13, comprising a multiplicity of spotlights (1) according to any of claims 1 to 11.
15. Workplace furniture that is equipped with a spotlight (1) according to any one of claims 1 to 11.

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