WO2011089553A1 - Système d'illumination pour combiner la lumière du jour et la lumière artificielle - Google Patents

Système d'illumination pour combiner la lumière du jour et la lumière artificielle Download PDF

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Publication number
WO2011089553A1
WO2011089553A1 PCT/IB2011/050233 IB2011050233W WO2011089553A1 WO 2011089553 A1 WO2011089553 A1 WO 2011089553A1 IB 2011050233 W IB2011050233 W IB 2011050233W WO 2011089553 A1 WO2011089553 A1 WO 2011089553A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
daylight
illumination system
optical element
sensor
Prior art date
Application number
PCT/IB2011/050233
Other languages
English (en)
Inventor
Matthias Wendt
Eduard Johannes Meijer
Hendrikus Hubertus Petrus Gommans
Original Assignee
Koninklijke Philips Electronics N.V.
Philips Intellectual Property & Standards Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V., Philips Intellectual Property & Standards Gmbh filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2011089553A1 publication Critical patent/WO2011089553A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S19/00—Lighting devices or systems employing combinations of electric and non-electric light sources; Replacing or exchanging electric light sources with non-electric light sources or vice versa
    • F21S19/005—Combining sunlight and electric light sources for indoor illumination

Definitions

  • Illumination system for combining daylight and artificial light
  • the present invention relates to an illumination system for combining daylight and artificial light.
  • an illumination system for combining daylight and artificial light comprising: an optical element for mixing light; at least one fiber arranged to receive daylight from an outside environment and to couple the daylight into the optical element; and at least one light source arranged to emit artificial light into the optical element, wherein the optical element is adapted to mix light from the at least one fiber and the at least one light source and to emit mixed light to illuminate an indoor environment.
  • Articles are here intended to include any light emitted from an artificial lighting system, such as electrical indoor lighting systems.
  • At least one fiber is here intended any fiber that is available for fiber optic communications, permitting transmission of collected daylight over longer or shorter distances.
  • a plurality of fibers may be arranged in a fiber bundle, forming a fiber cable.
  • optical element is here intended an element in which light from different sources of light are mixed, for example by means of reflection, and further emitted as a single light beam. Hence, the optical element acts as a single source of light, although the light originally emanates from different sources.
  • the present invention is based on the understanding that by mixing artificial light and daylight in an optical element from which the mixed light is emitted, a beam with a single source location may be perceived by a viewer.
  • the optical element may comprise a compartment enclosed by a partially reflective wall, i.e. having both reflective and transmissive characteristics, wherein the enclosed compartment acts as a mixing chamber.
  • the artificial light and daylight may be reflected and mixed, whereas the light transmissive characteristics of the wall allow the mixed light to be transmitted from the mixing chamber.
  • parts of the wall may be reflective whereas other parts of the wall may be transmissive.
  • the wall is formed by an interface between mediums with different index of refraction, to allow total internal reflection for a certain range of incident angles.
  • the optical element may further comprise an annular light guide surrounding the mixing chamber, the light guide having an inner in-coupling surface facing the mixing chamber and arranged to receive mixed light from the mixing chamber, and a light emitting surface arranged to emit mixed light, wherein the light guide is adapted to distribute the mixed light across the light-exit surface.
  • the annular light guide may distribute the light emitted into it and at the same time output the light as a single beam, through the light-exit surface of the light guide.
  • the mixing chamber may act as a single centrally arranged light source transmitting light in all directions into the light guide.
  • annular light guide may be tapered toward its periphery, which may improve the distribution of the emitted light.
  • the system may comprise a controller connected to the light source, and arranged to control properties of the artificial light based on information about the mixed light and/or the daylight in order to obtain a desired illumination.
  • control may be based on various types of feedback and/or feed forward, and may serve to provide a constant and stable illumination.
  • the illumination system may comprise a feedback light sensor arranged in the optical element; wherein the controller is connected to the sensor and configured to control properties of the artificial light in response to feedback of detected mixed light in the optical element.
  • the sensor and controller provide feedback control, wherein the mixed light is detected and the light source controlled in dependence of the detected conditions.
  • the detected mixed light conditions may change due to changes in daylight transmission, which may depend on for example weather changes, or time of the day or other circumstances that affects the transmission of daylight to the illumination system.
  • the desired mixed light conditions may for example be kept constant, or above a selected minimum level. In this way an accurate and relatively seamless increase or decrease in artificial light may be achieved when the transmitted daylight lighting conditions varies.
  • the illumination system may comprise a feed forward light sensor arranged in connection to the fiber, for detecting daylight guided by the fiber; wherein the controller is connected to the feed forward sensor and configured to control properties of the artificial light in response to feed forward of the detected daylight.
  • the sensor and controller may be provided to the system to obtain feed forward control, wherein the daylight transmitted to the illumination system is detected and the at least one light source controlled in dependence of the detected daylight conditions.
  • the light source output may for example be controlled so as to compensate for a decreased daylight, to keep a constant mixed light output, or to at least keep a minimum mixed light output.
  • the feed forward sensor may be arranged to detect light transmitted by a single fiber, whereby the single fiber may be used for this purpose only, and the remaining fibers for transmitting daylight into the system.
  • the feed forward sensor may be arranged adjacent to a bend in the fiber, for detecting light escaping from the fiber in the bend.
  • the fiber may be the only fiber in the illumination system or one out of a plurality of fibers.
  • the sensor may be arranged for detecting light escaping from a common bending point of a plurality of fibers, which may be advantageous when there is a plurality of fibers in a fiber bundle, since inhomogeneities in the fiber bundle resulting in erroneous control are reduced when light escaping from a common bending point of all fibers is detected.
  • the controller may be configured to control properties of the artificial light to compensate for a change of at least one of flux, color temperature, and spectral content of light detected by the sensor(s).
  • it may be enough to detect and compensate for the variations in luminous flux, whether in other applications it may be preferred with a more sophisticated control, where also the color temperature is compensated for.
  • a constant color temperature may be advantageous or the color temperature of the at least one light source may be controlled to obtain for example a warmer white color temperature than what is achieved by the current daylight conditions.
  • the system may be controlled to emit light with a color point having a saturated component to for example obtain other colors than white.
  • the sensor may hence be for example a flux sensor, a RGB light sensor, or a spectral sensing device.
  • control of the artificial light may be performed by a user, whereby the user may select to for example adjust the color temperature of the emitted light.
  • the at least one light source may be any light source such as a solid state light source, a light bulb or a fluorescent light source.
  • the at least one light source may be a solid state light source, since solid state light sources may be controlled in numerous ways, such as color controlled.
  • the solid state light source may be a light emitting diode (LED) or an organic light emitting diode (OLED).
  • LEDs or OLEDs an even more accurate and smooth takeover of artificial light may be achieved, when there are variations in the transmitted daylight lighting conditions. It is noted that the invention relates to all possible combinations of features recited in the claims.
  • Fig. 1 schematically shows an illumination system according to an embodiment of the present invention
  • Fig. 2 schematically shows an illumination system according to another embodiment of the present invention
  • Fig. 3 schematically shows an exemplary sensor arrangement in relation to feed forward control.
  • the illumination system of the present invention may be arranged in luminaries of various appearances.
  • the luminaire depicted in fig. 1-2 is annular, and may for example be mounted in the ceiling or on a wall.
  • the light that is output from the illumination system la-b emanates from two different sources, a daylight source and an artificial source.
  • the light from the two sources is however mixed by means of an optical element 10, 13 and output as a combined light output by the illumination system.
  • a light guide 13 is arranged to output the combined daylight and artificial light.
  • the light guide 13 is formed as a ring, with an inner 19 and outer 29 wall.
  • the light guide 13 further comprises a light-reflecting surface 15, such as a mirror layer, and a light-exit surface 16 opposite the light-reflecting surface, which surfaces 15, 16 are connected by the inner wall 19 forming a light-entry surface 14 of the light guide 13.
  • the light guide 13 is moreover tapered so that the distance between the light- reflecting surface 15 and the light-exit surface 16 is shorter at the circumference of the annular light guide 13 than at the light-entry surface 14, and the outer wall 29 is thereby shorter than the inner wall.
  • the light-exit surface 16 is arranged in a single plane.
  • the core of the light guide may be made of glass or any optical polymer such as polymethyl methacrylate, PMMA.
  • optical members of different refractive indices are provided, so as for the relations between these refractive indices and the refractive index of the light guide 13 to be part of the control of the out-coupling of the beam of light 18 from the illumination system through the light-exit surface 16.
  • a first optical member 17a is arranged in optical contact with the light-exit surface 16 of the light guide 13
  • a second optical member 17b is arranged in optical contact with the light-reflecting surface 15 of the light-guide 13.
  • the first optical member 17a may be a fluid
  • the second optical member 17b may be air.
  • a structured redirection layer 27, such as a so called redirection foil, is arranged in optical contact with the first optical member 17a, on the opposite side of the first optical member 17a relative the light guide 13.
  • the redirection layer may be made of polycarbonate, PC.
  • the inner wall 19 of the light guide 13 forms a wall of a mixing chamber 10, which mixing chamber is adapted to mix the light emanating from the artificial light and the daylight sources.
  • the daylight is transported into the mixing chamber 10 by a fiber cable 11 enclosing a plurality of fibers, whereas the artificial light originates from light sources 12, here LEDs, arranged to emit light into the mixing chamber 10.
  • the fiber cable 11 enters, and the light sources 12 are arranged to emit light from the same surface of the mixing chamber 10.
  • the wall 19 is partially reflective, having both reflective and transmissive properties, i.e. parts of the wall 19 may be reflective whereas other parts of the wall 19 may be transmissive.
  • the wall 19 is formed by an interface between mediums with different index of refraction, to allow total internal reflection for a certain range of incident angles.
  • the mixed light of combined daylight and artificial light is hence output from the wall 19 of the mixing chamber 10 like as it was emitted from a single light source. That is, the wall 19 is adapted to omnidirectionally emit light from the mixing chamber 10 into the annular light guide 13. As mentioned, the wall 19 accordingly acts as the light-entry surface 14 to the light guide 13.
  • the mixed light that enters the light guide 13 via the light-entry surface 14 is distributed through the light guide 13 by means of refiection in the light-reflecting surface 15 and reflection in dependence of relations between refractive indices of the optical
  • a sensor 20 is moreover arranged in the mixing chamber and a controller 21 is connected to the sensor 20 as well as to the light sources 12.
  • the controller may be arranged to control the light output by the light source 12, in order to ensure a desired combined light output.
  • the desired light output may be pre-set, or be provided by a user through a suitable interface.
  • the senor 20 detects the mixed light conditions in the mixing chamber 10, to detect levels to be used by the system for feedback control.
  • the sensor 20 may detect the flux and/or the color temperature of light.
  • the controller controls the light sources 12 for example to compensate for a decrease or increase in flux and/or color temperature.
  • a decrease in flux may for example depend on that a cloud has covered the sun and the transmitted daylight flux decreases accordingly. If a constant flux is desired the output from the light sources 12 is controlled so as to compensate for the entire decrease in flux, or if a minimum flux is sufficient, the controller controls the light sources 12 to keep the predetermined minimum flux of mixed light during the time when a decrease is detected.
  • the controller may control the light sources 12 to emit for example a warmer white light than what is detected in the mixed light, according to a predetermined target color point.
  • the illumination system may emit light with the same color temperature at all times, independently of time of the day or seasonal variations.
  • a light output with a saturated target color point may be desired, so as for the illumination system to emit a light of a certain color, or a color which still is perceived as white light but with a saturation component.
  • the spectral content in the mixed light is detected and controlled.
  • another sensor 22 may be arranged to detect daylight transmitted from a single fiber 23 dedicated for this purpose. This results in that the system may be able to be controlled also by feed forward control, which is described in more detail in relation to fig. 2.
  • the sensor 22 may detect for example flux, color temperature or spectral contents contributed by all available fibers and forward the information to the controller 21 which in its turn control the light sources 12 in response to the detected information.
  • control may be performed as by using the above described feedback control, although the control is performed in response to the current daylight conditions of the transmitted daylight, and not the current mixed light conditions. That is, the control may be performed to keep a constant level or a minimum level of for example flux. Additionally or alternatively the color temperature or the spectral contents may be controlled.
  • the illumination system lb depicted in fig. 2 is similar to that depicted in fig. 1.
  • the sensor 22 is arranged at an alternative location to detect the conditions of the transmitted daylight, for the system to be able to be controlled by feed forward control.
  • This arrangement is based on that stray light escapes from a fiber if it is bent. Therefore, a sensor can be arranged adjacent to a bend of a fiber to detect the current daylight conditions of transmitted light.
  • the fibers comprised in the fiber cable 11 are separated and uniformly bent, in relation to each other, outwardly toward the wall 19 of the mixing chamber 10, to emit light omnidirectionally into the mixing chamber 10.
  • the termination points of the fibers are accordingly annularly arranged inside the wall 19 of the mixing chamber 10.
  • the light sources 12 are moreover annularly arranged in between the fiber termination points.
  • the sensor 22 is arranged centrally underneath the bend of the fibers in a closed area wherein no artificial light is present. The sensor 22 may therefore detect the combined stray light escaping from all of the available fibers simultaneously without interference from the artificial light.
  • FIG. 3 another sensor arrangement for feed forward control is illustrated.
  • the plurality of fibers are uniformly bent like into a disc shape to be able to detect the combined stray light escaping from all of the available fibers simultaneously.
  • a sensor 22 is centrally arranged inside the disc to detect the stray light from both the common bending point of all fibers both above and beneath the sensor 22.
  • the fibers are first flattened out, and then bent, whereby the sensor is arranged along the bend of all fibers.
  • Yet another alternative is to bend the entire fiber bundle 11, and arrange the sensor in front of the bend, which may be sufficient in some applications although the light escaping from the fibers is not completely homogeneous at the measuring point.
  • the sensor may also be arranged to detect the light conditions close to a bending point of a single fiber, which may be sufficient.
  • a single fiber may be dedicated for the detection of transmitted daylight.
  • the sensor may alternatively be arranged in a daylight collection system for detecting the received daylight already at this stage.
  • the mixing chamber may emit light into any other type of light guide, there may be a single light source arranged in the mixing chamber, or the light sources may be of other types than LEDs.
  • the optic member may be any member adapted to mix light from different sources and emit the light as combined light from the different sources.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un système d'illumination (1a ; 1b) permettant de combiner la lumière du jour et la lumière artificielle. Le système d'illumination comprend un élément optique (10, 13) destiné à mélanger la lumière, au moins une fibre (11) disposée de manière à recevoir la lumière du jour depuis l'extérieur et à coupler la lumière du jour dans l'élément optique, et au moins une source de lumière (12) conçue pour émettre une lumière artificielle dans l'élément optique, l'élément optique étant conçu pour mélanger la lumière de ladite au moins une fibre et la lumière de ladite au moins une source de lumière, et pour émettre une lumière mélangée afin d'éclairer un environnement intérieur.
PCT/IB2011/050233 2010-01-22 2011-01-19 Système d'illumination pour combiner la lumière du jour et la lumière artificielle WO2011089553A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10151409 2010-01-22
EP10151409.9 2010-01-22

Publications (1)

Publication Number Publication Date
WO2011089553A1 true WO2011089553A1 (fr) 2011-07-28

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ID=43828374

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/050233 WO2011089553A1 (fr) 2010-01-22 2011-01-19 Système d'illumination pour combiner la lumière du jour et la lumière artificielle

Country Status (2)

Country Link
TW (1) TW201144663A (fr)
WO (1) WO2011089553A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011051548U1 (de) * 2011-10-06 2013-01-08 Zumtobel Lighting Gmbh Beleuchtungsvorrichtung mit natürlichem und künstlichem Licht
US9668312B2 (en) 2013-10-02 2017-05-30 Philips Lighting Holding B.V. Lighting system and a method of controlling a lighting system
DE102016218712A1 (de) 2016-09-28 2018-03-29 Zumtobel Lighting Gmbh Optisches System für eine Leuchte, sowie Leuchte

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104406122A (zh) * 2014-11-10 2015-03-11 华南理工大学 一种地下车库照明灯具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000032015A1 (fr) * 1998-11-24 2000-06-02 Ensol, Llc Dispositif de mesure et de renforcement de la lumiere naturelle
US6381070B1 (en) * 1999-08-26 2002-04-30 Alexander L. Cheng Method and apparatus for lighting
US20040187908A1 (en) 2001-09-18 2004-09-30 Muhs Jeffrey D. Hybrid solar lighting distribution systems and components
US20090021934A1 (en) * 2007-07-17 2009-01-22 Michael Yi Chu Optical illuminating system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000032015A1 (fr) * 1998-11-24 2000-06-02 Ensol, Llc Dispositif de mesure et de renforcement de la lumiere naturelle
US6381070B1 (en) * 1999-08-26 2002-04-30 Alexander L. Cheng Method and apparatus for lighting
US20040187908A1 (en) 2001-09-18 2004-09-30 Muhs Jeffrey D. Hybrid solar lighting distribution systems and components
US20090021934A1 (en) * 2007-07-17 2009-01-22 Michael Yi Chu Optical illuminating system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011051548U1 (de) * 2011-10-06 2013-01-08 Zumtobel Lighting Gmbh Beleuchtungsvorrichtung mit natürlichem und künstlichem Licht
EP2578928A3 (fr) * 2011-10-06 2015-08-12 Zumtobel Lighting GmbH Dispositif d'éclairage avec lumière naturelle et artificielle
US9668312B2 (en) 2013-10-02 2017-05-30 Philips Lighting Holding B.V. Lighting system and a method of controlling a lighting system
DE102016218712A1 (de) 2016-09-28 2018-03-29 Zumtobel Lighting Gmbh Optisches System für eine Leuchte, sowie Leuchte

Also Published As

Publication number Publication date
TW201144663A (en) 2011-12-16

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