EP2314910B1 - Illumination system for light stagings - Google Patents

Description

In addition to the primary task of providing sufficient light and thus optimal viewing conditions, it is often a task of modern lighting and lighting systems to produce desired moods and atmospheres by means of light. Whether to emphasize the architecture, to create a soothing, relaxing atmosphere or to attract attention by means of light effects, light, staged accordingly, is used in a variety of situations to set accents and emotions. In a variety of applications, suitably staged light can significantly contribute to how space or architecture is experienced and perceived.

For example, the DE 20 2005 001 572 U1 on a lighting target device comprising a transparent rotary body. Furthermore, the refers DE 200 06 292 U1 on an optical arrangement for generating moving light figures. The present invention, a lighting system, should make a contribution to create an atmospheric ambience by means of artistically staged light. In the lighting system according to the invention, dynamic light installations are projected onto a wall, a ceiling or other surfaces. By animating the wall, ceiling or other surface, the interest of present persons should be awakened. Depending on the application, a feel-good and relaxing atmosphere can be created at the same time. Areas of application for which the illumination system according to the invention is intended are, for example, reception halls and reception areas (for example of hotels), Lounges, bars, wellness oases recreation and refreshment zones, private living rooms or comparable premises. Of course, it is also conceivable that the lighting system according to the invention is installed in the outer space, for example. That the light installations are projected on the outer facades of buildings.

The invention relates to a lighting system for light stagings according to the preamble of claim 1.

The present invention is a further development of a lighting system currently marketed by the Applicant under the name "Empedos - Biorhythm Wallwasher" (see Zumtobel brochure "Special Products 07/08"), which is a wall washer designed as a floor lamp and light installations ("Lichtmalerein") projected onto walls or other surfaces.These light installations are to be understood as projection images with irregular brightness and / or color progression, which do not reveal regular structures or a symmetry and should convey a harmonious, atmospheric impression Zumtobel's brochure "Special Products 07/08" can be found on page 9. In the case of "Empedos", these lighting scenes change over time in operation and new dynamic creations (projection images) with a new brightness and color gradient are constantly being created Development of "Empedos" was the wish of the lighting designer that these projection images will not repeat themselves as far as possible over time. The aim was - to put it in the words of the marketing department of the applicant - that in the changing, constantly new Light projections "the never-recurring rhythm of nature" should reflect.

In the following, the known from the prior art technical structure of the lighting system "Empedos" is briefly outlined. The housing of the floor lamp is designed as a closed elongated cuboid, which is placed on a front side on the floor and has a light exit opening on one side in the upper area. The luminaire housing is reflective on the inside in the optical range. Within the luminaire housing, a lamp with comparatively high light output, for example a high-pressure gas discharge lamp, is arranged in the lower area. Their white light strikes two dichroic filters arranged next to each other above the lamp. These dichroic filters are rotatably mounted about a horizontal axis (this is normal to the main direction of the luminous flux which extends in a vertical direction). By rotating the filters, the color spectrum of the light, as explained in more detail below, be changed dynamically. Diochroic filters are narrow-band, high-quality color filters whose operation is based on interference and which are constructed of a material that has dichroic optical properties. Dichroic materials are characterized by having at least two different optical axes. This causes optical properties (eg the absorption behavior) to be dependent on the angle at which the luminous flux falls on the material. This directionality is exploited in "Empedos" by slowly twisting the dichroic filters around an axis. The twisting of the dichroic filters is electronic, specifically in the market available Variant by an electric stepper motor. Over time, the white light hits the filters at different angles, which absorb different wavelengths. From the originally white light, a colored light is generated, the spectrum of which changes over time, depending on the rotational speed of the filters.

Subsequently, the light thus prepared in the different shades reaches light on a translucent hollow spherical structure made of glass, which is also rotatably mounted about an axis and is slowly rotated by a second stepping motor. This hollow sphere is the heart of the lighting system. The hollow sphere is irregular in shape and has no rotational symmetry with respect to the axis of rotation. In some places, small bulges or invaginations can be found. In addition, the hollow sphere has an irregular wall thickness, ie, the glass wall has thickenings at some points (the shape is locally similar to a convex lens), at other locations dilutions (corresponds locally to a concave lens) which act as optical beam focusing or light beam expanding. If the light now passes the hollow glass sphere, the individual light beams of a light beam are influenced in different ways: locally, light is locally more strongly refracted, locally hardly deflected in some places, then focused or widened in other places or due to the wavelength dependence of the refraction of light Colors fanned out. The overall effect of the hollow glass sphere is that behind the glass sphere the light rays concentrate in individual areas, which are lightened locally above average; it comes so to a play of colors and light irregular brightness and color gradient. Physically, this effect is called Kaustik. Since the shape of the hollow sphere is irregular and the hollow sphere rotates slowly, the brightness and color pattern changes over time.

A parabolic mirror, which is positioned at the top of the floor lamp, projects the light rays through the light exit opening to the outside. The mirror is arranged at a slightly greater distance from the glass hollow sphere. As a result, a part of the light rays on the way between glass hollow sphere and mirror is additionally reflected on the inside of the lamp housing. It forms a kind of light mixing chamber, which improves the harmonious brightness course of light staging.

The overall brightness of the projected light image is controlled by an iris diaphragm located between the lamp and the dichroic color filters.

In summary, the lighting staging system known in the art includes a first light source, at least one translucent optical means rotatably mounted about an axis, and a device which rotates the optical means.

The current technical solution has some shortcomings and disadvantages: The construction is relatively bulky, technically relatively complex and complex. It is, for example, a larger number of mechanically moving parts used, including two electric motors, which are relatively heavy and have relatively large space requirements.

In addition, high-quality elements such as dichroic filters are needed, which are relatively expensive. Due to the complex construction, the "Empedos" luminaire could only be realized as a floor lamp. However, there are requirements from customers who wish that the lighting system, for example, can be mounted on a ceiling. This is a much more compact design than previously necessary. In the current variant, the light stagings are colorful / colored, i. There are always several different colors. In addition, however, the illumination system according to the invention should also be able to produce purely white light projections in which, for example, only the color temperature of the white light changes.

The object of the invention is to provide a lighting system in which the above disadvantages are avoided or at least improved. Particular attention should be paid to a cost-effective, energy-efficient solution that can be integrated into a compact housing.

According to the invention the object is achieved by the characterizing features of claim 1. Advantageous developments of the invention are described in the appended subclaims or can be taken from the following descriptions and the exemplary embodiments.

Accordingly, the illumination system comprises a first light source, at least one translucent optical means which is rotatably mounted about an axis, and a device which sets the optical means in rotation, wherein the illumination system at least a second light source, which emits a different light spectrum from the first light source, wherein the at least two light sources are each driven separately from each other, wherein the optical means is formed as a hollow cylindrical structure and wherein refractive structures in the form of A on the outer surface of the hollow cylindrical structure - And / or protuberances are arranged.

In an advantageous embodiment, the effect of the optical means based on refraction of light, the light staging based on kaustischen effects.

Preferably, the optical means has no symmetry with respect to the axis. In a preferred embodiment, the wall thickness of the hollow cylindrical structure has irregularities.

According to the invention, a random or pseudorandom component is integrated in the control of the individual light sources and / or in the control of the rotational movement of the optical means.

In a preferred embodiment, the light sources are semiconductor light sources. In an advantageous manner, at least one of the light sources emits colored light, in particular red, green or blue light. Alternatively / optionally, at least one of the light sources can emit white light with a correlated color temperature (CIE) of 2000-7000 Kelvin, in particular 2000-3500 K (warm white), 3500-5000 K or 5000-7000 K (cool white).

According to the invention, at least two different light scenarios can be stored in a control unit and the lighting system at least one interface have, over which a light scenario can be selected.

In an advantageous embodiment, the lighting system can be mounted on a ceiling.

Fig. 1

zeigt schematisch einen Querschnitt eines bevorzugten Ausführungsbeispiels.

Fig. 2

ist eine schematische, perspektivische Darstellung eines Teils des Beleuchtungssystems.

Fig. 3 bis 5

zeigen verschiedene Ansichten des bei dem erfindungsgemäßen Beleuchtungssystem verwendeten optischen Mittels.

Fig. 6a und Fig. 6b

zeigen Kurven, die den zeitlichen Helligkeitsverlauf angeben.

The invention will be explained in more detail with reference to advantageous embodiments and simplified drawings.

Fig. 1

schematically shows a cross section of a preferred embodiment.

Fig. 2

is a schematic perspective view of a part of the lighting system.

Fig. 3 to 5

show various views of the optical means used in the illumination system according to the invention.

Fig. 6a and Fig. 6b

show curves that indicate the temporal brightness course.

Fig. 1 shows a schematic cross section of a preferred embodiment of the invention. The lighting system 100 has a compact housing 1, which has a light exit opening on one side. In the present embodiment, the light exit opening is covered by a glass plate 2. Furthermore, the illumination system has a holder 3. This embodiment is due to its compact design suitable for being able to be mounted by means of the bracket 3 to a ceiling or wall. With appropriate adaptations, the lighting system Of course, also be designed as a floor lamp or in other variants.

The interior of the illumination system 100 is shown in cross-section in FIG Fig. 1 or from the Fig. 2 showing a schematic perspective view thereof. According to the invention, the illumination system has at least two light sources 4 which emit a different light spectrum. In the specific case, these light sources are semiconductor light sources (light-emitting diodes (LEDs) or laser diodes). Since the different colors or color temperatures should harmoniously or continuously merge into one another in the light installations generated by the illumination system, the light sources 4 are preferably designed or provided with a corresponding primary optics such that they radiate their light relatively ready or release it into a large diaper area ,

The light sources 4 are selective, ie in individual channels independently, electrically controlled and dimmable. A power supply unit (power supply) 5 serves to provide the electrical energy necessary for operating the lighting system. A control unit 6 controls the electrical consumers of the lighting system, ie the light sources 4 and an electric motor 7. In a preferred embodiment, LEDs, which are colored light, especially in the spectral primary colors red, green or blue, emitting, so that by additive color mixing light can be generated in any color. Alternatively or optionally, the LEDs 4 can be white light, for example with a correlated color temperature (CIE) of 2000-7000 Kelvin, in particular 2000-3500 K. (warm white), from 3500-5000 K or from 5000 - 7000 K (cool white), blast. Preference is given to several LEDs are used, each emitting white light with a different correlated color temperature (CIE). A combination of a white light source or white light LED with one or more colored LEDs would be conceivable.

In the beam path between the light sources 4 and the light exit opening is at least one light-transmitting, light-directing optical means 8 which is rotatably mounted about an axis 9. The optical means 8 has irregularities 8a, the light-directing properties of the optical means can not be rotationally symmetrical with respect to the axis of rotation 9. The optical properties may therefore change when the optical means is rotated about the axis 9. In a preferred variant, the light-directing effect is based on refraction of light, but embodiments are also conceivable whose effect is based on light diffraction or scattering.

In the concrete example, it is an approximately hollow-cylindrical structure made of glass, which is rotatably mounted about the cylinder center axis 9 and electronically, for example. By an electric motor, in the figures denoted by 7, can be set in rotation. The approximately cylindrical shape is advantageous if, as in the specific embodiment, the LEDs are arranged on an elongate board or in the longitudinal direction one behind the other. The LEDs 4 are then close to the outer circumference of the cylinder and are arranged parallel to its longitudinal or rotational axis. In principle, the LEDs 4 may be arranged in any configuration and the shape of the glass structure may be thereon be tuned, it is therefore not limited to a hollow cylindrical shape. For example, if the LEDs are arranged in close proximity in a compact manner, effectively resulting in an approximately punctiform light source (eg, if there are only two or three LEDs that are very close together), then a spherical hollow sphere as described above may be used in lighting technology be the most advantageous solution.

The translucent, light directing optical means - in the presented embodiment of the in the Fig. 3 to 5 Glass cylinder shown in detail - is an important part of the lighting system. As explained in more detail above with reference to the hollow sphere, the optical means - the glass cylinder - may have irregularities which break the rotational symmetry with respect to the axis of rotation. Similar to the hollow sphere locally small bulges or small invaginations can be performed in some places. The ratio of the width δ of these structures 8a in comparison to the diameter D of the hollow cylinder 8 is preferably in the range between 0.05 and 0.25 (see Fig. 4 ). For example, if the hollow cylinder 8 has a diameter D of about 4 cm, the width δ of the structures 8a is approximately in the range of 0.25 cm to 1.0 cm. The length of the cylinder 8 is about 12 cm, the wall thickness d is about 0.5 cm. Of course, the dimensions can also be adapted to the particular application. Thus, the length of the cylinder could also be significantly increased, if the desired light staging should extend over a larger area. However, with the dimensions given above, a very compact and nevertheless powerful illumination system is obtained.

Alternatively or optionally, the wall thickness of the hollow cylinder may also be irregular, it may have local thickening in some places, in turn, local dilutions in other places. The concrete exact design of the glass cylinder requires the artistic expression of the lighting and is in the hands of the lighting designer, for the understanding of the technical functioning of the lighting system is the exact form of not relevant.

The overall effect of the light directing optical means is that the light rays, when they exit the luminaire housing through the light exit surface, are concentrated in individual areas and thereby lighten them. The result is a light staging with irregular brightness and / or color gradient. Physically, this effect is called Kaustik.

Compared to the prior art, the use of LEDs has several advantages. The brightness of the LEDs can be controlled electronically very easily, and also in an energy-efficient manner. With the iris diaphragm, a brightness control is only possible by shading and therefore energy inefficient accordingly. Furthermore, the expensive and high-quality dichroic filters are no longer necessary. The LEDs are almost punctiform light sources and hardly emit in the infrared range. Therefore, they can be positioned closer to the glass cylinder, whereby the light-directing effect of the glass cylinder is enhanced. Due to this, the distance mentioned above between the optical means and the light exit surface can also be kept very short.

The lighting system further includes a system for driving the light sources and for controlling the light sources Rotational movement of the optical means. The control takes place via the control unit 6, which is preferably designed as an integrated control circuit, which may, for example, contain a microcontroller or an ASIC. The control unit controls the light output of the at least two different light sources, for example via the supplied electrical current, the supplied electrical voltage or the supplied electrical power. It can also control the rotational movement of the optical means via the electric motor 7.

In a preferred embodiment, the individual are. Light sources in different channels individually controllable and dimmable.

If the control unit is designed as a programmable digital circuit, then different light scenarios (scenarios for light staging) can be programmed, which specify the time course of the brightness of each individual light source or the rotational speed of the optical means. It can be stored in an internal memory several different light scenarios, which are offered to the user for selection and can be selected by him via an interface. It is also possible for the control unit to have an interface via which the control unit can receive commands by means of control protocols (for example by means of the DMX, DSI or DALI protocols established in lighting technology). The different light scenarios can also be selected by means of a control protocol.

A possible light scenario could include only one or more light sources emitting white light being driven, whereas in one alternative light scenario used alternatively or additionally light sources with colored light. For a light scenario with white light, for example, one or more white LEDs with a correlated color temperature of 2000-3500 K (warm white), 3500-5000 K and / or LEDs with a color temperature of 5000-7000 K (cool white) can be controlled. For a light scenario with colored light, for example LEDs in the primary colors red, green and / or blue and optionally one or more white LEDs can be activated.

As mentioned above, a desired driving scenario is that the projection images do not repeat over time. If the light spectrum emitted by the light sources is constant over time and monotonous, then the light projections have a temporal periodicity, the period duration corresponding to a complete circulation of the glass cylinder. In a preferred embodiment, the brightness images should change dynamically and never repeat, if possible.

According to the invention, a random or pseudo-random component is integrated in the control of the individual light sources and / or in the control of the movement of the optical means. If, for example, the control unit is realized by means of a programmable microcontroller, this can be implemented, for example, with the aid of a programmed (pseudo) random generator in the microcontroller.

In Fig. 6a and Fig. 6b the temporal brightness course of an implementation example is shown. It shows Fig. 6a the brightness of a single LED. During the period ton_1 (resp. ton_2, ton_3) the LED lights up, during the period toff_1 (or toff_2, toff_3) it is switched off. From the off state, the brightness increases up to a maximum brightness Imax_1 (or Imax_2, Imax_3) before it decreases again. As indicated in the drawing, the values for tone, toff and Imax are different, they are chosen randomly.

In Fig. 6b the temporal brightness curve of three different LEDs (LED1, LED2 and LED3) is shown. The values for tone and / or toff times and / or the maximum brightnesses Imax are determined by means of a random generator. It should be ensured that at any time at least one LED emits light and the total brightness of the lighting system does not fall below a certain value.

Claims (13)

1. Lighting system (100) for lighting scenarios, comprising a first light source (4), at least one light permeable optical means (8) mounted to rotate about an axis (9), and a device (7) with sets the optical means (8) in rotation, wherein the lighting system has at least one second light source which emits a light spectrum which differs from the first light source, wherein the at least two light sources (4) are controllable separately from one another,
   characterized in that
   the optical means (8) is configured as a hollow-cylindrical structure, and that refractive structures (8a) are arranged in the form of recesses and/or protuberances on the outer surface of the hollow-cylindrical structure.
2. Lighting system (100) according to claim 1,
   characterized in that
   the effect of the optical means (8) is based on light refraction while the lighting is based on caustic effects.
3. Lighting system (100) according to claim 1 or 2,
   characterized in that
   the optical means (8) has no symmetry with respect to the axis (9).
4. Lighting system (100) according to claim 1,
   characterized in that
   the ratio of the width (δ) of the light-refracting structures (8a) to the diameter (D) of the hollow-cylindrical structure is in the range from 0.05 to 0.25.
5. Lighting system (100) according to claim 1 or 4,
   characterized in that
   the wall thickness (d) of the hollow-cylindrical structure is about 0.5 cm.
6. Lighting system (100) according to claim 1,
   characterized in that
   the wall thickness of the hollow-cylindrical structure comprises irregularities.
7. Lighting system (100) according to one of the preceding claims,
   characterized in that
   a random or pseudo-random component is integrated in the control of the individual light sources (4) and/or during the control of the rotational movement of the optical means (8).
8. Lighting system (100) according to one of the preceding claims,
   characterized in that
   the light sources (4) are semiconductor light sources, in particular LEDs.
9. Lighting system (100) according to one of the preceding claims,
   characterized in that
   at least one of the light sources (4) emits colored light, in particular red, green or blue light.
10. Lighting system (100) according to one of the preceding claims,
    characterized in that
    at least one of the light sources (4) emits white light with a correlated color temperature (CIE) of 2000-7000 Kelvin, in particular of 2000-3500 K (warm white), of 3500-5000 K or of 5000 - 7000 K (cold white).
11. Lighting system (100) according to one of the preceding claims,
    characterized in that
    the axis (9) is a longitudinal axis, and the light sources (4) are arranged parallel to the longitudinal axis (9) of the optical means (8).
12. Lighting system (100) according to one of the preceding claims,
    characterized in that
    at least two different light scenarios are stored in a control unit (6), and wherein the lighting system (100) comprises at least one interface via which a light scenario may be selected.
13. Lighting system (100) according to one of the preceding claims,
    characterized in that
    the lighting system (100) may be mounted on a ceiling.

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