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WO2011132110A1 - Dispositif d'éclairage pour éclairage à projecteur à faisceau variable - Google Patents

Dispositif d'éclairage pour éclairage à projecteur à faisceau variable Download PDF

Info

Publication number
WO2011132110A1
WO2011132110A1 PCT/IB2011/051552 IB2011051552W WO2011132110A1 WO 2011132110 A1 WO2011132110 A1 WO 2011132110A1 IB 2011051552 W IB2011051552 W IB 2011051552W WO 2011132110 A1 WO2011132110 A1 WO 2011132110A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
lighting device
optical element
collimating optical
exit aperture
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB2011/051552
Other languages
English (en)
Inventor
Frank Van Zon
Ralph Kurt
Ramon Pascal Van Gorkom
Mark Eduard Johan Sipkes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2011132110A1 publication Critical patent/WO2011132110A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/08—Controlling the distribution of the light emitted by adjustment of elements by movement of the screens or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/16—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed
    • F21V11/18—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed movable, e.g. flaps, slides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios

Definitions

  • the present invention relates to a lighting device for spot illumination, comprising a light-source array.
  • barn doors are shutters that are arranged on different sides of the output of the lighting device (for example spot light). The shutters can be controlled to partly cut of the light-beam so as to control the spatial distribution of the light-beam.
  • the lighting device 1 comprises a large number of LEDs 2 (only one LED is indicated by a reference numeral in Fig. 1) arranged in a plane.
  • the lighting device 1 further has four barn-doors 3a-d arranged as indicated in Fig. 1. When those barndoors 3a-d are operated, the lighting device 1 in Fig. 1 does not, however, produce the output that would be expected by a user who is used to conventional barn-door equipped lighting devices for spot illumination applications.
  • a general object of the present invention is to provide an improved lighting device for spot illumination, providing for an improved capability to vary the shape of the light-beam output by the lighting device.
  • a lighting device for spot illumination comprising: a collimating optical element having an entrance aperture, and an exit aperture being larger than the entrance aperture; a light-source array comprising a plurality of light-sources arranged to emit light into the collimating optical element at the entrance aperture thereof; and at least one movably arranged light-shutter arranged at the exit aperture of the collimating optical element in such a way that the light-shutter can be moved to partly block a light-beam output through the exit aperture of the collimating optical element to thereby shape the light-beam.
  • collimating optical element should, in the context of the present application, be understood an optical element capable of collimating light, i.e. reducing the spatial spreading of light output by one or several light-source(s).
  • the collimating optical element may be realized in the form of a single optical member, or may be comprised of several co-operating optical members.
  • the present invention is based on the realization that the problems encountered when trying to implement barn-door functionality in the prior art lighting device 1 shown in Fig. 1 are mainly caused by the fact that there is no correlation between the position at the output of the lighting device 1 and the direction of the light that is output by the lighting device.
  • This behavior of the lighting device 1 in Fig. 1 is illustrated in Fig. 2, which is a simplified section view showing a single barn-door 3d being operated.
  • Fig. 2 is a simplified section view showing a single barn-door 3d being operated.
  • the spatial distribution of light output by the lighting device 1 when the barn-door 3d is operated is almost unchanged as compared to the case when all barndoors 3a-d are outside the light-beam as illustrated in Fig. 1.
  • the present inventors have further realized that the above-described problem can be at least partly solved by providing a collimating optical element between the light-sources 2 and the barndoors 3a-d.
  • the collimating optical element Through the provision of the collimating optical element, the correlation between the position at the output of the collimating optical element and the direction of the output light at the output of the collimating optical element can be improved.
  • the collimating optical element may be configured in such a way that a majority of light-rays output by the lighting device move away from an optical axis of the lighting device with increasing distance from the exit aperture of the collimating optical element, along the optical axis of the lighting device. That this is the case can, for example, be determined by photometric measurements of the radial light distribution (polar light diagram) at different positions at the exit aperture of the collimating optical element, preferably using a (small) diaphragm at the exit aperture of the lighting device for spot illumination.
  • a collimating element may also be referred to as "a diverging collimating optical element".
  • the light-rays output by the lighting element may be continuously diverging after having passed through the exit aperture.
  • a majority of the light-rays may not cross the optical axis after having passed through the exit aperture.
  • all light-rays should preferably propagate in parallel with, or move away from the optical axis of the lighting device with increasing distance from the exit aperture of the collimating optical element.
  • a substantial improvement as compared to the prior art lighting device 1 in Fig. 1 can be achieved if more than 70%, preferably more than 80%, most preferably more than 90% of the light-rays move away from the optical axis of the lighting device with increasing distance from the exit aperture of the collimating optical element.
  • the desired barn-door functionality can be achieved, while still enjoying all the benefits provided by replacing traditional relatively inefficient light-sources with light- sources arrays, such as LED-arrays.
  • the collimating optical element may comprise a tubular reflector having the entrance aperture and the exit aperture; and a diverging optical element arranged to spread the light emitted by the light-sources.
  • Such a tubular reflector may be realized in various shapes.
  • the tubular reflector may exhibit rotational symmetry (about the optical axis), or the tubular reflector may have a polygonal cross-section in a plane perpendicular to the optical axis, as will be described further below.
  • the tubular reflector may exhibit any one of, or a combination of, various cross-sections in a plane including the optical axis, depending on the application.
  • this cross-section may be concave ("trumpet shaped”), convex (for example parabolic), or linear.
  • the tubular reflector may advantageously comprise a parabolic portion.
  • the diverging optical element may advantageously be a diffuser, which can co-operate with the tubular reflector to achieve the desired divergent collimation of the light output by the light-source array.
  • the optical diffuser may be arranged at a diffuser position located along the optical axis of the lighting device and at a distance from the entrance aperture of the tubular reflector, which is more than 20% and less than 80% of a distance from the entrance aperture to the exit aperture of the tubular reflector, along the optical axis of the lighting device.
  • the tubular reflector may comprise a first portion providing a first divergence from the entrance aperture to the diffuser position and a second portion providing a second divergence greater than the first divergence from the diffuser position to the exit aperture.
  • a portion of the tubular reflector has a certain "divergence" should be understood that the portion of the tubular reflector is configured to collimate light to an emission cone having a certain opening angle. A greater divergence is equivalent to a larger opening angle of the emission cone.
  • the light that is output by the light-sources can be "pre-focused" before it reaches the optical diffuser, to compensate for the broadening of the light-beam caused by the optical diffuser.
  • the light-beam is made divergent by the second portion of the tubular reflector to improve the correlation between the directions of the light-rays and their positions at the exit aperture of the tubular reflector.
  • the first portion of the tubular reflector may be defined by a parabola
  • the second portion may be defined by a parabola that is tilted away from the optical axis of the lighting system.
  • tubular reflector may have a substantially polygonal cross-section.
  • polygonal cross-section should, in the context of the present application, be understood a cross-section that is bounded by a closed path of lines connected at at least three points, forming the corners of the polygonal cross-section.
  • the lines can be straight or curved.
  • each path between the corners of the polygon may be concave or convex with respect to the polygonal cross-section.
  • the polygonal cross section may be heptagonal (7 sides) or enneagonal (9 sides).
  • the tubular reflector may advantageously have the above-mentioned polygonal cross-section in a portion located between the entrance aperture and the diffuser position, to enhance the mixing of light emitted by the different light-sources even further.
  • the lighting device may comprise a plurality of movably arranged light-shutters arranged at the exit aperture of the collimating optical element.
  • the plurality of movably arranged light-shutters may be so-called "barn doors", which may be formed by flaps of metal or plastic or similar.
  • the light-source array comprised in the lighting device may comprise a plurality of differently colored light- sources, which may advantageously be arranged in individually controllable sets of light- sources.
  • colored light can be achieved without using filters etc.
  • Such differently colored light-sources may, for example, emit different primary colors or different whites, such as "warm white”, “neutral white”, or “cold white”, etc.
  • such differently colored light-sources may advantageously be arranged in such a way that the colors are balanced (i.e. that the center of gravity for each color is in or close to the center of the light-source array).
  • the lighting device may additionally comprise a light-mixing arrangement arranged to mix the light emitted by the light-sources comprised in the light- source array, and to emit mixed light into the collimating optical element.
  • a light-mixing arrangement may advantageously comprise a (tubular) reflector having a polygonal cross-section to provide for good color mixing.
  • the polygonal cross section may be heptagonal (7 sides) or nonagonal / enneagonal (9 sides).
  • the light-mixing arrangement may further comprise an optically diffusing transmissive optical element arranged to diffuse light passing from the light-mixing arrangement into the collimating optical element.
  • Fig. 1 illustrates a LED-based lighting device according to the prior art, being equipped with so-called barn doors;
  • Fig. 2 schematically illustrates why the desired shaping of light cannot be obtained using the prior art lighting device in Fig. 1;
  • Fig. 3a schematically illustrates a lighting device according to a first embodiment of the present invention
  • Fig. 3b is a diagram illustrating the variation in spatial distribution of output light (barn-door effect) obtainable using the lighting device in Fig. 3a;
  • Fig. 4 schematically illustrates a lighting device according to a second embodiment of the present invention having a diverging optical element in the form of a negative lens arranged at the exit aperture of the collimating optical element;
  • Fig.5 schematically illustrates a lighting device according to a third embodiment of the present invention, comprising a light-mixing arrangement provided between the light-source array and the entrance aperture of the collimating optical element;
  • Fig.6 schematically illustrates a lighting device according to a fourth embodiment of the present invention, comprising a tubular reflector with a polygonal cross- section.
  • Fig. 3 schematically illustrates an lighting device for spot illumination suitable for atmosphere creating lighting, such as scene setting.
  • the lighting device 10 comprises a light-source array 11 formed by a plurality of light-sources 12 (only one of the light-sources is indicated by a reference numeral for ease of drawing), such as LEDs.
  • the light-sources 12 are arranged on a carrier 13, which is in thermal contact with a heat-sink 14.
  • the lighting device 10 further comprises a collimating optical element 15 having an entrance aperture 16 and an exit aperture 17.
  • the light-source array 11 is arranged at the entrance aperture 16, and shutters 18a-c, so-called barn doors, are arranged at the exit aperture 17.
  • the shutters 18a-c are provided in the form of flaps, which are movably arranged at the exit aperture 17 of the collimating optical element 15. By moving the flaps/barn doors 18a-c, the operator of the lighting device 10 can shape the beam by blocking light going in certain directions as will be described further below with reference to Fig. 3b.
  • the collimating optical element 15 comprises a tubular reflector 20, and a diverging optical element in the form of an optical diffuser 21.
  • the optical diffuser 21 is arranged at a diffuser position between the entrance aperture 16 and the exit aperture 17, defining a first portion 23a of the tubular reflector 20 located between the entrance aperture 16 and the optical diffuser 21, and a second portion 23b of the tubular reflector 20 located between the optical diffuser 21 and the exit aperture 17.
  • the first portion 23a is substantially defined by a parabola
  • the second portion 23b is defined by a parabola that is tilted away from an optical axis 25 of the lighting device 10.
  • the optical diffuser 21 By means of the optical diffuser 21, the light emitted by the light-sources is mixed and spread out, and through the divergent collimating properties of the second portion 23b of the tubular reflector, a relatively narrow light-beam can be formed, which still has a relatively strong correlation between the position at the output of the collimating optical element 15 and the direction of the light-rays at the exit aperture 17 of the collimating optical element 15.
  • Fig. 3b is a diagram illustrating the barn-door effect obtainable using the lighting device in Fig. 3a.
  • the diagram in Fig. 3b shows the luminous intensity as a function of angular deviation from the optical axis in a plane including the optical axis.
  • Fig 4 is a schematic cross-section view of a lighting device 30, in which the optical collimating element 15 comprises a tubular reflector 20 and a diverging optical element in the form of a negative lens 31 arranged at the exit aperture 17 of the optical collimating element 15.
  • Fig 5 schematically illustrates a lighting device 40, comprising a collimating optical element 15 having an entrance aperture 16 and an exit aperture 17. At the exit aperture, barn doors 18a-d are movably arranged analogously as described above with reference to Fig. 3a.
  • the lighting device 40 in Fig. 5 further comprises a light-mixing arrangement 41 arranged to mix the light emitted by differently colored light-sources (not visible in Fig. 5), and to emit the mixed light into the collimating optical element 15 at the entrance aperture 16.
  • the light-mixing arrangement 41 may comprise a tubular reflector having a polygonal cross-section, and may also comprise an optical diffuser arranged to diffuse the light before it enters the collimating optical element 15.
  • improved color mixing can be obtained, which reduces various image artifacts, such as a colored border region at the edges of the light beam.
  • Fig. 6 schematically illustrates a lighting device 50 according to yet another embodiment of the present invention.
  • the collimating optical element 15 comprised in the lighting device 50 in Fig. 6 has a polygonal cross-section, and has segments 51 that extend along substantially straight lines from the entrance aperture 16 to the exit aperture 17 of the collimating optical element 15.
  • Such a configuration provides for a very good mixing of the light emitted by the light-source array 11, which reduces various image artifacts, such as a colored border region at the edges of the light beam.

Landscapes

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

Abstract

L'invention porte sur un dispositif d'éclairage (10 ; 30 ; 40 ; 50) pour un éclairage à projecteur, lequel dispositif comprend : un élément optique de collimation (15) ayant une ouverture d'entrée (16), et une ouverture de sortie (17) qui est plus grande que l'ouverture d'entrée (16) ; un groupement de sources de lumière (11) comprenant une pluralité de sources de lumière (12) agencées de façon à émettre une lumière dans l'élément optique de collimation (15) à l'ouverture d'entrée (16) de celui-ci ; et au moins un obturateur de lumière agencé de façon mobile (18a-d) disposé à l'ouverture de sortie (17) de l'élément optique de collimation (15). Grâce à la disposition de l'élément optique de collimation, la corrélation entre la position à la sortie de l'élément optique de collimation et la direction de la lumière de sortie à la sortie de l'élément optique de collimation peut être améliorée.
PCT/IB2011/051552 2010-04-19 2011-04-12 Dispositif d'éclairage pour éclairage à projecteur à faisceau variable Ceased WO2011132110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10160242.3 2010-04-19
EP10160242 2010-04-19

Publications (1)

Publication Number Publication Date
WO2011132110A1 true WO2011132110A1 (fr) 2011-10-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/051552 Ceased WO2011132110A1 (fr) 2010-04-19 2011-04-12 Dispositif d'éclairage pour éclairage à projecteur à faisceau variable

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WO (1) WO2011132110A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017093709A1 (fr) * 2015-12-04 2017-06-08 Dyson Technology Limited Dispositif d'éclairage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007294370A (ja) * 2006-03-28 2007-11-08 Toshiba Lighting & Technology Corp スポットライト
US20080062682A1 (en) * 2004-09-24 2008-03-13 Koninklijke Philips Electronics, N.V. Illumination System
CN201137834Y (zh) * 2007-12-25 2008-10-22 鹤山丽得电子实业有限公司 一种舞台灯的光源组件

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080062682A1 (en) * 2004-09-24 2008-03-13 Koninklijke Philips Electronics, N.V. Illumination System
JP2007294370A (ja) * 2006-03-28 2007-11-08 Toshiba Lighting & Technology Corp スポットライト
CN201137834Y (zh) * 2007-12-25 2008-10-22 鹤山丽得电子实业有限公司 一种舞台灯的光源组件

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017093709A1 (fr) * 2015-12-04 2017-06-08 Dyson Technology Limited Dispositif d'éclairage
US10054288B2 (en) 2015-12-04 2018-08-21 Dyson Technology Limited Lighting device

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