EP2333404A1 - Projecteur lumineux avec diffuseur - Google Patents

Projecteur lumineux avec diffuseur Download PDF

Info

Publication number
EP2333404A1
EP2333404A1 EP10193952A EP10193952A EP2333404A1 EP 2333404 A1 EP2333404 A1 EP 2333404A1 EP 10193952 A EP10193952 A EP 10193952A EP 10193952 A EP10193952 A EP 10193952A EP 2333404 A1 EP2333404 A1 EP 2333404A1
Authority
EP
European Patent Office
Prior art keywords
lighting device
light
plate
light source
liquid crystals
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.)
Withdrawn
Application number
EP10193952A
Other languages
German (de)
English (en)
Inventor
Sebastian Heise
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2333404A1 publication Critical patent/EP2333404A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F21V14/003—Controlling the distribution of the light emitted by adjustment of elements by interposition of elements with electrically controlled variable light transmissivity, e.g. liquid crystal elements or electrochromic devices
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a lighting device, in particular in the form of a beacon for TV studios, stages, etc.
  • the lighting device comprises a light source.
  • halogen lamps are used for such purposes, the lighting area being optionally restricted by means of diaphragms or lens systems.
  • diffusers which can be selectively inserted into the illumination beam path and removed from it. Without a diffuser, the light from the object spotlight hits concentrated on a small section of the stage. If the diffuser is introduced into the beam path, the light is scattered in the most different directions, so that a planar illumination is generated. When changing between the two states, the diffuser is moved mechanically.
  • the invention is based on the object to present such a lighting device that allows fast switching between different lighting conditions. Based on the above-mentioned prior art, the object is achieved by the features of the independent claim. Advantageous embodiments can be found in the subclaims.
  • a plate-shaped element is arranged in the beam path of the light source.
  • the plate-shaped member comprises two transparent plates enclosing a liquid crystal layer therebetween.
  • the plate-shaped element can assume two states. In a first state, the liquid crystals are disordered. In a second state, the liquid crystals are aligned with each other. For switching between the states, an electric voltage is applied to the liquid crystal layer.
  • a beacon refers to a high-intensity illumination device, with which an object can be illuminated from a distance.
  • the light emanating from the illuminator can be adjusted so that it is concentrated on the object, while other areas are not illuminated.
  • object radiators can be used in particular in TV studios, theaters, stages. Possible are also uses in the lighting of buildings, shop windows, showcases and the like.
  • the liquid crystals in the plate-shaped element have the property that they are translucent only in certain directions.
  • the liquid crystals in the liquid crystal layer are disordered, the light coming from the light source is scattered and directed in various directions. Even if the liquid crystals are disordered, a large part of the incident light may pass through the plate-shaped member. The exiting light is diffuse, the plate-shaped element thus acts like a frosted glass.
  • the plate-shaped element in this state acts as a diffuser.
  • the plate-shaped element in this state is transparent in the sense that one can recognize an object through the plate-shaped element. In this state of the plate-shaped element, therefore, the light from the light source is passed directly to the object.
  • the liquid crystals are disordered in the initial state and they align after applying a voltage.
  • the plate-shaped elements thus have an electrically adjustable transparency.
  • the plate-like elements are known and commercially available.
  • the plate-shaped elements according to the invention of so-called light locks, which are based on liquid crystals. Characteristic of light locks, like them for example, used in LCD displays is a state in which the light is not allowed to pass.
  • the diffuser according to the invention it is possible to switch the lighting device almost instantaneously between a direct illumination and a diffuse illumination. In particular, it is no longer necessary to move the diffuser mechanically into or out of the beam path.
  • the transparent plates of the plate-shaped elements are preferably arranged substantially parallel to each other.
  • the plates may be made of glass or other material such as plastic.
  • the material can be rigid or flexible. If the plates are flexible, the plate-shaped element as a whole is flexible. The plates can be even. Also possible are embodiments in which the plates are curved.
  • the plate-shaped elements are often not very heat resistant.
  • a light source that emits much heat such as an incandescent lamp or a halogen lamp
  • An advantage is a light source that emits little heat, such as an LED.
  • the diffuser can then be arranged at a small distance from the light source, for example less than 20 cm, preferably less than 10 cm.
  • the light source may include a plurality of LEDs.
  • the LEDs can be arranged two-dimensionally, for example in the form of a matrix or honeycomb.
  • cooling means for the plate-shaped elements may be provided.
  • the LEDs preferably comprise a collimator optic arranged in front of the luminous substrate, so that the light is emitted in a narrow cone of rays.
  • the collimator optics of the LED should be distinguished from other lenses that the illumination device may possibly have.
  • an electrically conductive layer may be formed on each side of the liquid crystal layer.
  • a voltage source can be provided between the two electrically conductive layers.
  • a switch is arranged between the voltage source and the electrically conductive layers, with which the voltage can be switched on or off. By operating the switch, it is possible to switch between a state of the plate-shaped member in which the liquid crystals are disordered and a state in which the liquid crystals are aligned with each other.
  • a voltage regulator is provided with which a plurality of different voltages can be applied between the electrically conductive layers.
  • the voltage regulator may be configured to adjust DC voltage or AC voltage, the adjustment preferably can be steplessly.
  • the term voltage regulator also encompasses devices which generate different voltage profiles, for example by generating a specific average voltage by rapid switching back and forth. Experiments have shown that rapidly changing voltages can cause a faster reaction of the liquid crystals.
  • a particular object be permanently subject to direct illumination and that the illumination be varied only in the environment of the object. It may therefore be expedient if the plate-shaped elements only partially cover the light emitted by the light source. It can then be adjusted whether the permanent direct illumination is supplemented by further direct light or by diffused light.
  • One application for this could be the lighting of a showcase, which is to be permanently illuminated directly, while in the environment different illuminations are desired, for example, depending on the additional incident daylight.
  • the illumination device can be set up in such a way that even further properties of the light conducted onto the object can be influenced.
  • These properties may be, for example, the color of the light or the color temperature.
  • the light source can have a plurality of separate light regions which emit light with different properties.
  • the light areas may be created by filters having different properties.
  • a first light region of the light source can be warm-white and a second light region of the light source can be cold-white Emit light. It is also possible that the different light areas emit light in different colors.
  • the diffuser can comprise a plurality of mutually separate sub-areas, which can be controlled separately from one another.
  • the partial surfaces may be formed on a single plate-shaped element or on a plurality of plate-shaped elements.
  • the partial areas can be assigned to the light areas.
  • a partial surface of the diffuser is arranged in front of each light region.
  • the properties of the light can now be influenced. For example, if the partial area arranged in front of the warm-white light area is in the clear state (liquid crystals aligned) and the partial area arranged in front of the cold-white light area is in the diffuse state (liquid crystals disordered), the object is primarily illuminated with warm white light. If the object is then to be illuminated cold-white, then a reverse control of the partial surfaces is required. If the voltage applied to the faces is changed simultaneously and in opposite directions, it is possible to switch between warm white light and cold white light without the brightness changing significantly. Also any intermediate states between warm-white light and cold-white light can be adjusted in this way. Corresponding transitions are possible between light of different colors.
  • the illumination device therefore comprises an optical element, with which the light emerging from the partial surfaces can be superimposed.
  • the illumination device can be equipped with further lens elements which are arranged in the beam path and influence the illuminated area.
  • the electrically controllable plate-shaped elements can be arranged directly behind the LEDs, ie between the LEDs and the lens systems.
  • the electrically controllable plate-shaped elements between the lenses or lens systems are arranged.
  • the plate-shaped elements are arranged by the light source on the other side of the lens system.
  • a suspension for the lighting device which makes it possible that the lighting device can be moved relative to a rigid structure.
  • a rigid structure in this sense for example, a tripod is considered.
  • the invention further relates to an arrangement comprising a lighting device according to the invention and a wall, wherein the lighting device is arranged such that the light emitted by the lighting device strikes the wall at an acute angle.
  • a lighting device is arranged at a small distance from the plane of the wall, which illuminates obliquely on the wall.
  • the illumination device according to the invention it becomes possible to vary between a concentrated illumination of a small area and a uniform illumination of a larger area.
  • the lighting device can be adjusted so that even in the near range, the different colors of a multi-colored light source are not individually visible.
  • An acute angle is understood in particular to mean an angle of less than 20 °, preferably less than 10 °.
  • the angle refers to the center beam of the illumination.
  • the lighting device can be arranged on the same side of the wall on which the TV camera is arranged. The light is then reflected off the wall. The application is also possible with translucent walls. The lighting device is then placed on the other side of the wall and the light passes through the wall.
  • FIG. 1 A lighting device 14 according to the invention is shown in FIG Fig. 1 arranged on a tripod 15. Via a hinge 16, the lighting device 14 can be pivoted up and down, a hinge 17, the lighting device 14 can be rotated to the right and left.
  • the illumination device 14 is set to provide concentrated illumination for an object 18 on a stage 19.
  • the illumination device 14 comprises a light source 29 arranged in a housing 20.
  • the light source 29 is composed of a plurality of light sources Fig. 5 shown LEDs 30 together.
  • the LEDs 30 are arranged honeycomb-like side by side and aligned parallel to each other to the output of the housing 20.
  • Each LED 30 includes a collimator optics so that the light is emitted in the form of a narrow cone.
  • a diffuser 21 is arranged at the outlet of the housing 20.
  • the light source 29 is a single powerful LED, for example with a power of more than 50 W.
  • the diffuser 21 Contained in the diffuser 21 is a plurality of liquid crystals 22 which transmit light only in certain directions, respectively. Are the liquid crystals 22 as in Fig. 3A aligned with each other, they are all translucent in the same direction. When light that is in Fig. 3 indicated by arrows 24, impinges on the diffuser 22, the light can pass directly through the diffuser 22 in the appropriate direction. The diffuser 22 is then transparent. Are the liquid crystals 22 as in Fig. 3B disordered, the light is diffused in the diffuser 21 in all possible directions. Also in this state, the majority of the light on the other side of the diffuser 21 exits again, but in different directions. The effect of the diffuser 21 is similar to that of frosted glass.
  • the diffuser in the lighting device 14 has the shape of a plate-shaped element 25.
  • the plate-shaped element 25 comprises two glass plates 26, which are arranged at a small distance parallel to each other. Between them, the glass plates 26 enclose a layer of liquid crystals 22. Between the glass plates 26 and the liquid crystal layer, a conductive layer 27 is formed respectively. Via a controllable voltage source 28, a voltage between the conductive layers 27 can be applied. When no voltage is applied between the conductive layers 27, the liquid crystals 22 are disordered and incident light is scattered in various directions. By applying a voltage between the conductive layers 27, the liquid crystals 22 are aligned with each other. Incident light can pass straight through and the plate-shaped element 25 becomes transparent.
  • the voltage source 28 is infinitely variable, so that a continuous transition of the liquid crystals 22 from the disordered state to the aligned state is possible.
  • a voltage is applied to the diffuser 21 and the diffuser 21 is transparent.
  • the light generated by the light source 29 passes straight through the diffuser 21 and impinges directly on the object 18 on the stage 19.
  • This lighting condition is suitable, for example, to take close-up shots of the object 18.
  • the stage 19 is uniformly illuminated with diffused light over a large area, so that good illumination is provided for overview photos.
  • Fig. 6 shows a front view of an alternative embodiment of a lighting device according to the invention 14.
  • the light source 29 is divided into four separate light regions 31. In each light region 31, twelve LEDs 30 are arranged in matrix form. Two obliquely opposite light areas 31 are equipped with LEDs 30 which emit cold white light. The LEDs 30 of the other two light areas 31 emit warm white light.
  • the plate-shaped element 25 of the diffuser 21 has four partial surfaces 32 on which a voltage can be applied independently of one another.
  • a cross section through the corresponding plate-shaped element is in Fig. 7 shown.
  • the conductive layer 27 is interrupted according to the partial surfaces 32.
  • a voltage source 28 is provided, so that an independent control of the partial areas 32 is possible.
  • Fig. 7 is at the lower part surface 32 to a voltage and not on the upper part surface 32.
  • Each of the partial surfaces 32 of the diffuser 21 is assigned to a light region 31 and positioned in front of the relevant light region 31.
  • the warm-white light and the cold-white light can be directed or scattered directly on the object.
  • suitable control of the partial surfaces 32 as a continuous change in the color temperature of the illumination is possible. In particular, this change is possible without at the same time the brightness changes significantly.
  • the light areas 31 are equipped with LEDs 30 of different color, it is possible in a corresponding manner, to achieve continuous transitions in the color of the lighting.
  • LEDs 30 instead of LEDs 30 with different colors, the same color LEDs can be used and the light can be influenced by appropriate filters.
  • the plate-shaped element 25 covers only a part of the LEDs 30.
  • the centrally arranged LEDs 30 always radiate directly onto the object. Only with the LEDs 30 at the edge can be set whether they should illuminate the object directly or whether the light should be scattered.
  • Fig. 9 there are two lens systems indicated schematically at 5, with which the illumination angle can be changed by displacing these lens systems or by shifting parts of the lens systems relative to one another.
  • the plate 21 can be selected again between direct illumination by the LEDs of the lighting device 1 and a diffuse illumination.
  • the light source 29 is composed of a red LED 33, a green LED 34 and a blue LED 35, which are each equipped with a Kolllimatoroptik.
  • a single controllable diffuser 21 is arranged in front of each LED. Via mirrors 36 and the dichroic mirrors 37, the light is superimposed into a concentric light beam. If all diffusers 21 are in the same state, the superimposed light beam is white. If, for example, the light of the red LED 33 is scattered more strongly, the result is an image as shown in FIG Fig. 10 indicated at 38. It forms a corona of red light, while the intensity of the red light in the center is reduced.
  • Fig. 11 shows a TV studio with a table 38 and a chair 39, on which, for example, a newscaster can sit.
  • the background for the images taken with a TV camera 40 forms a wall 41.
  • a lighting device 14 according to the invention is arranged, which illuminates the wall 41 at an acute angle. By adjusting the diffuser 21, the intensity and the area distribution of the illumination can be set so that the desired image is created for the TV camera.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP10193952A 2009-12-09 2010-12-07 Projecteur lumineux avec diffuseur Withdrawn EP2333404A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202009016729U DE202009016729U1 (de) 2009-12-09 2009-12-09 Beleuchtungseinrichtung mit mindestens einer LED

Publications (1)

Publication Number Publication Date
EP2333404A1 true EP2333404A1 (fr) 2011-06-15

Family

ID=43532711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10193952A Withdrawn EP2333404A1 (fr) 2009-12-09 2010-12-07 Projecteur lumineux avec diffuseur

Country Status (3)

Country Link
US (1) US8727552B2 (fr)
EP (1) EP2333404A1 (fr)
DE (1) DE202009016729U1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9894257B2 (en) * 2015-05-13 2018-02-13 Apple Inc. Light source module with adjustable diffusion
CN207096634U (zh) * 2017-06-28 2018-03-13 广州市浩洋电子股份有限公司 一种舞台灯具智能线性雾化导光体及舞台灯
DE102019118714B3 (de) * 2019-07-10 2021-01-07 Stefan Karle Softbox für Scheinwerfertore
DE102019125266A1 (de) * 2019-09-19 2021-03-25 OSRAM CONTINENTAL GmbH Optische Anordnung, Fahrzeug, Fahrzeugleuchte und Verfahren
CN113555490A (zh) * 2020-04-26 2021-10-26 群创光电股份有限公司 发光装置
US11698183B1 (en) * 2022-04-22 2023-07-11 Foshan Yifeng Electric Industrial Co., Ltd. Stage light with electronically adjustable lighting effects

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999009351A1 (fr) * 1997-08-14 1999-02-25 Strand Lighting Limited Obturateur a cristaux liquides pour dispositif d'eclairage
US20030035290A1 (en) * 1991-04-30 2003-02-20 Bornhorst James M. High intensity lighting projectors
WO2005101445A1 (fr) * 2004-04-15 2005-10-27 Koninklijke Philips Electronics N.V. Cellule chromato-convertible electriquement commandee
WO2007057830A1 (fr) * 2005-11-21 2007-05-24 Philips Intellectual Property & Standards Gmbh Systeme optique
DE202007008430U1 (de) 2007-06-15 2008-10-16 Heise, Sebastian Beleuchtungsvorrichtung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228895C2 (de) * 1992-08-29 2002-09-19 Bosch Gmbh Robert Kraftfahrzeug-Beleuchtungseinrichtung mit mehreren Halbleiterlichtquellen
GB9607994D0 (en) * 1996-04-18 1996-06-19 Screen Tech Ltd Liquid crystal display element
DE19910004A1 (de) * 1999-03-08 2000-09-21 Oezsoy Fazil Abblendvorrichtung für Kfz-Scheinwerfer
DE10135387A1 (de) * 2001-07-25 2003-02-13 Baier Karl Blende für Linsenmotorradscheinwerfer, Projektionsmotorradscheinwerfer, Polyellipsoidscheinwerfer, welche zwischen der Lichtquelle mit Reflektor und der Lichtaustrittslinse angeordnet wird, aus lichtundurchlässigem Material, welches durch Anlegen einer elektrischen Spannung an festgelegten Stellen lichtdurchlässig wird, um auf diesem Weg das Strahlmuster zu verändern
KR100712766B1 (ko) * 2002-01-31 2007-05-02 미츠비시 레이온 가부시키가이샤 광원 장치
DE10308703A1 (de) * 2003-02-28 2004-11-11 Audi Ag Kraftfahrzeugscheinwerfer
GB0322681D0 (en) * 2003-09-27 2003-10-29 Koninkl Philips Electronics Nv Multi-view display
GB2425611B (en) * 2005-03-29 2010-03-24 Hewlett Packard Development Co Reflective colour display device
DE102008008484B4 (de) * 2008-02-08 2022-01-20 Volkswagen Ag Verfahren zum Steuern einer Scheinwerferanordnung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030035290A1 (en) * 1991-04-30 2003-02-20 Bornhorst James M. High intensity lighting projectors
WO1999009351A1 (fr) * 1997-08-14 1999-02-25 Strand Lighting Limited Obturateur a cristaux liquides pour dispositif d'eclairage
WO2005101445A1 (fr) * 2004-04-15 2005-10-27 Koninklijke Philips Electronics N.V. Cellule chromato-convertible electriquement commandee
WO2007057830A1 (fr) * 2005-11-21 2007-05-24 Philips Intellectual Property & Standards Gmbh Systeme optique
DE202007008430U1 (de) 2007-06-15 2008-10-16 Heise, Sebastian Beleuchtungsvorrichtung

Also Published As

Publication number Publication date
US20110170296A1 (en) 2011-07-14
DE202009016729U1 (de) 2011-04-28
US8727552B2 (en) 2014-05-20

Similar Documents

Publication Publication Date Title
EP1568935B1 (fr) Lampe chirurgicale
EP0846915B1 (fr) Lumière pour espace intérieur
EP2333404A1 (fr) Projecteur lumineux avec diffuseur
DE10034594A1 (de) Zahnärztliche Behandlungsleuchte
DE202012013045U1 (de) Beleuchtungsvorrichtung mit mehrfarbigem Lichtstrahl
DE102008013049A1 (de) Leuchte, insbesondere zur Erzielung eines tageslichtähnlichen Lichtspektrums
DE102005029119A1 (de) Beleuchtungsvorrichtung, insbesondere für Mikroskope
EP2071227A1 (fr) Luminaire pour mur et/ou plafond
EP2765354B1 (fr) Lampe avec disque conducteur de lumière
DE202011051548U1 (de) Beleuchtungsvorrichtung mit natürlichem und künstlichem Licht
WO2007122113A1 (fr) Système d'éclairage modulaire et ensemble d'éclairage
EP2472177B1 (fr) Eclairage
DE202009001048U1 (de) Leuchte, insbesondere Not- oder Sicherheitsleuchte
EP1568936A1 (fr) Lampe chirurgicale et procédé d'illumination d'un champ opératoire
EP3081855B1 (fr) Projecteur
DE29710475U1 (de) Innenleuchte
EP2685295A1 (fr) Alimentation lumineuse latérale
DE202020100790U1 (de) Leuchte mit kombinierte Shelfwasher- und Spotfunktion
EP3002506B1 (fr) Éclairage ayant une quantite de lumiere directe et indirecte
DE202017104281U1 (de) Leuchte
DE102013215586B4 (de) Projektionsvorrichtung
DE202022101815U1 (de) Deckenleuchte und Beleuchtungsanordnung
DE102013222352A1 (de) Beleuchtungseinrichtung mit Lichtgenerator und Kollimator
DE102009022026A1 (de) Anordnung mehrerer Lichtquellen für Leuchten mit unterschiedlich einstellbarem Lichtkegel
DE102005022175A1 (de) Multispektrale Beleuchtungseinheit

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20111216