EP0402845B1 - Projecteur à intensité lumineuse réglable de façon continue - Google Patents

Projecteur à intensité lumineuse réglable de façon continue Download PDF

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Publication number
EP0402845B1
EP0402845B1 EP90111058A EP90111058A EP0402845B1 EP 0402845 B1 EP0402845 B1 EP 0402845B1 EP 90111058 A EP90111058 A EP 90111058A EP 90111058 A EP90111058 A EP 90111058A EP 0402845 B1 EP0402845 B1 EP 0402845B1
Authority
EP
European Patent Office
Prior art keywords
light
projecting device
light projecting
light source
reflector
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.)
Expired - Lifetime
Application number
EP90111058A
Other languages
German (de)
English (en)
Other versions
EP0402845A2 (fr
EP0402845A3 (fr
Inventor
Hans Michael Dipl.-Ing. Wörwag
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.)
Reiche und Vogel Hm Worwag GmbH
Original Assignee
Reiche und Vogel Hm Worwag 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 Reiche und Vogel Hm Worwag GmbH filed Critical Reiche und Vogel Hm Worwag GmbH
Publication of EP0402845A2 publication Critical patent/EP0402845A2/fr
Publication of EP0402845A3 publication Critical patent/EP0402845A3/fr
Application granted granted Critical
Publication of EP0402845B1 publication Critical patent/EP0402845B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12—Combinations of only three kinds of elements
    • 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
    • F21V14/02—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
    • 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
    • F21V14/06—Controlling the distribution of the light emitted by adjustment of elements by movement of refractors
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/02—Fastening of light sources or lamp holders with provision for adjustment, e.g. for focusing
    • 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
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • 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
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • 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
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
    • F21V23/0457—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor sensing the operating status of the lighting device, e.g. to detect failure of a light source or to provide feedback to the device
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • 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
    • F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
    • 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

  • Such headlights are usually operated with discharge lamps.
  • a headlamp with a gas discharge lamp is known from US-A-3,624,386.
  • Discharge lamps can only be controlled electrically within certain limits, for example with a phase control or with a variable transformer.
  • the brightness of the discharge lamp can thus only be reduced to a predetermined level, for example up to half of its maximum sanctity. In most cases, however, it is necessary to continuously regulate the holiness of a spotlight from zero to the maximum brightness.
  • the sanctity of the discharge lamp is first shut down electrically as far as is technically possible. Further darkening is achieved by mechanical means such as blinds or gray wedges reached.
  • the known mechanical devices of this type are very expensive to manufacture and operate very sensitive.
  • US-A-1 455 929 shows a spot light projector for generating a parallel light beam which can produce a light spot at a great distance.
  • the spot light projector contains an ellipsoid mirror, through which a light source in the form of an incandescent lamp, which is arranged in one focal point of the ellipsoid, is imaged in the other focal point of the ellipsoid. This other focus of the ellipsoid is again in the focus of a lens.
  • the lens creates the parallel light beam.
  • the incandescent lamp is adjustable, since the parallelism of the light beam depends crucially on the exact positioning of the incandescent lamp at the focal point of the ellipsoid mirror. The adjustment of the light bulb does not change the brightness of the bundle.
  • DE-A-2 105 389 shows an optical system for a spot light projector, in which a light source designed as an incandescent lamp is imaged by a concave mirror onto an aperture diaphragm.
  • An optical system consisting of two lenses generates a light beam that creates a circle of light on an object to be illuminated.
  • the frames of the two lenses do not limit the light beam.
  • the two lenses can be moved along the optical axis in such a way that the light circle, which is aimed at a moving object, remains almost the same size and the intensity of the illumination remains almost constant. So the aim is to achieve a constant intensity of illumination and not to change the intensity.
  • a spotlight for television and film studios which can be used either as a floodlight or as a spotlight spotlight.
  • An incandescent lamp serves as the light source.
  • the headlamp contains a bowl-shaped, diffusely reflecting main reflector for floodlighting.
  • the main reflector has an opening in its apex. In this opening there is a step lens for use as a spotlight.
  • a bowl-shaped diffuser is arranged on the outlet side of the light source. During floodlight operation, the diffuser throws the light emitted forward from the light source onto the main reflector.
  • a system of concentric, cylindrical rings is arranged in front of the main reflector in order to limit the scattering angle of the scattered light emitted by the main reflector.
  • a spherical bowl-shaped reflector is arranged behind the light source.
  • the reflector can be swiveled by 180 ° for point light operation.
  • the light source can be moved in the direction of the optical axis into the focal point of the stepped lens. In this arrangement, too, there is no change in the intensity of the light beam.
  • US-A-4 338 654 relates to a stage spotlight with a light source, a reflector, an iris diaphragm and a lens.
  • the reflector and light source can be moved along the optical axis of the stage spotlight relative to the lens.
  • the iris diaphragm is adjusted at the same time so that there is no loss of light.
  • the brightness of the stage spotlight is not being changed.
  • a headlight is known from EP-A-0 192 882, in which the coloring of the light bundle and the beam angle by changing the distance between the light source and a reflector can be changed by filter elements switched into the light bundle.
  • filters elements switched into the light bundle.
  • lenses, diaphragms and mirrors also serve to change the beam angle of the light beam. In both cases, there is no continuous regulation of the brightness of the headlamp.
  • GB-A-2 037 415 describes a headlight in the housing of which a further component is arranged to be displaceable along the optical axis, while a collecting lens or a Fresnel lens is optionally fastened in the housing on the output side.
  • the displaceable component contains a spherical reflector mirror, a light source and an aperture.
  • the light beam is focused by moving the displaceable component.
  • the light source can also be focused within the displaceable component by displacement relative to the reflector mirror.
  • this shift only serves to optimally adjust the light beam for the various operating modes with a converging lens or Fresnel lens.
  • the lens is first exchanged. Then the optimal position of the light source relative to the reflector is sought and the light source is locked. Only then is the headlight used again, for example, for lighting a stage, it then no longer being possible to shift the light source relative to the reflector.
  • US-A-3 930 149 a headlight-like light source for dental purposes is known, the brightness of which can be regulated continuously within a certain range.
  • This device has an incandescent lamp with reflector, a pinhole and a converging lens. While the distance between the pinhole and converging lens remains constant on the optical axis, the distance between the pinhole and the component consisting of an incandescent lamp and a reflector can be changed. This change in distance changes the brightness of the the converging lens emerging light beam without having to accept a change in the brightness of the incandescent lamp, which would be associated with a change in the light color. Because the incandescent lamp and reflector have to be moved together, the size of the device according to US Pat. No. 3,930,149 is limited.
  • the invention has for its object to provide a simple and robust device for adjusting the brightness of headlights in operation, which allows a continuous darkening to practically zero.
  • the focus of the light beam changes.
  • a larger light spot is created in the plane of the diaphragm, and accordingly a smaller proportion of the light passes through the constant diaphragm opening.
  • the axial adjustment of the light source is easier to accomplish than, for example, the adjustment of a blind panel, which also causes lighting problems (see e.g. DE-C3-15 97 930).
  • Axial adjustment of the light source along the optical axis also ensures illumination that is always symmetrical and largely uniform with respect to the optical axis.
  • Embodiments of the invention are the subject of the further subclaims.
  • 10 denotes an elliptical reflector.
  • the reflector 10 forms part of an ellipsoid of revolution.
  • Such an ellipsoid of revolution has two focal points 12 and 14.
  • the optical axis 16 of the headlight passes through these two focal points 12 and 14.
  • Each light beam which is emitted from one of the focal points, e.g. 12 goes out and falls on the reflector, is at the reflector 10 by the other focal point, e.g. 14, reflected.
  • a light source 18 in the form of a discharge lamp is arranged in the focal point 12.
  • the light beam emanating from the light source 18 and detected by the reflector 10 is therefore collected in the other focal point 14. This is indicated by a beam 20 of this light beam.
  • an aperture 22 is provided with an aperture 24 lying symmetrically to the optical axis 16.
  • the aperture 24 forms a "light source” for a downstream headlight optics 26, which is shown here as a stepped lens.
  • the discharge lamp 18 is seated on a straight nut 28 which projects through an opening in the apex of the reflector 10.
  • the nut 28 is guided on a threaded spindle 30. Lugs 32 of the nut 28 are guided in grooves 34.
  • the threaded spindle 30 is driven by an actuator 36.
  • the brightness of the discharge lamp 18 can be changed down to a certain percentage of the maximum brightness by means of electrical actuating means 38.
  • the servomotor can be controlled via a motor controller 40.
  • a controller 42 receives a setpoint value for the brightness from a setpoint generator 44.
  • An actual value for the brightness of the headlamp is supplied by a sensor 46 and is likewise connected to the controller 42.
  • the brightness of the discharge lamp 18 is changed electrically via the adjusting means 38.
  • a further darkening is achieved by the discharge motor 18 being moved out of the focal point 12 by the servomotor via the threaded spindle 30.
  • the switchover of the actuating means is shown in FIG. 1 by a switch 46.
  • FIG. 2 illustrates the effect of adjusting the discharge lamp 18 relative to the first focal point 12 in FIG. 1. It can be seen that the light beam emerging from the light source, the discharge lamp 18, is no longer collected by the reflector 10 in the second focal point 14 of the ellipsoid. Rather, a light spot occurs in the plane of the diaphragm 22 that is larger than the diaphragm opening 24. Part of the light energy of the light beam is thus dimmed. The light spot becomes larger the further the discharge lamp 18 is moved to the left in FIG. There is thus an increasing darkening of the light beam emitted by the headlight.
  • the reflector 50 is parabolic.
  • the reflecting surface of the reflector forms a paraboloid of revolution with a focal point 52. All rays emanating from the focal point 52 are reflected by the reflector parallel to the optical axis 54. If, on the other hand, as shown in FIG. 3, the light source 56 is displaced with respect to the focal point 52, then the rays are reflected divergently.
  • a ring diaphragm 58 sits in front of the reflector.
  • the ring diaphragm 58 consists of a plurality of cylindrical diaphragm rings 60 which are coaxial to one another and to the optical axis 54.
  • the rays of the light beam falling on the reflector 50 become, as said , reflected parallel to the optical axis 54. This is shown in dashed lines for a beam 62 in the lower part of FIG.
  • the rays of the light beam therefore pass between the aperture rings 60.
  • the light source 56 is displaced strongly against the focal point 52, as shown in FIG. 3, then a large part of the rays strikes the aperture rings 60.
  • the aperture rings 60 are blackened so that the rays are absorbed.
  • conventional imaging optics which are not shown here in detail, can also be provided, which images the aperture 24 as a light spot on a scene on a stage.
  • a slide can also be arranged at the location of the aperture.

Landscapes

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

Claims (12)

  1. Projecteur muni
    (a) d'un réflecteur (10;50) muni d'un axe optique (16;54) et d'au moins un foyer (12;52),
    (b) d'une source lumineuse (18;56) ajustable le long de l'axe optique (16) par rapport au foyer (12;52),
    (c) d'un diaphragme (22;58) situé dans la marche des rayons du faisceau lumineux,
       caractérisé par le fait que
    (d) pour régler en continu la luminosité du projecteur en fonctionnement, l'ajustage de la source lumineuse (18;56) a lieu au moyen d'un arbre (30) actionné par un moteur de commande (36).
  2. Projecteur selon la revendication 1, caractérisé par le fait que le réflecteur (10) est elliptique, le diaphragme (22) est disposé au plan du foyer (14) de l'ellipse du réflecteur (10) et la source lumineuse (18) est susceptible d'être ajusté par rapport à l'autre foyer (12) de l'ellipse.
  3. Projecteur selon la revendication 2, caractérisé par le fait que une optique (26) du projecteur , pour laquelle l'ouverture (24) du diaphragme sert de source lumineuse, est placée à la suite du diaphragme.
  4. Projecteur selon la revendication 3, caractérisé par le fait que l'optique du projecteur est constituée d'une lentille Fresnel (26) et que la lentille Fresnel (26) est susceptible être ajustée par rapport au diaphragme (24).
  5. Projecteur selon la revendication 3, caractérisé par le fait que l'optique du projecteur est une optique de reproduction par laquelle l'ouverture du diaphragme est susceptible d'être reproduite en tâche lumineuse sur la scène à illuminer.
  6. Projecteur selon la revendication 1, caractérisé par le fait que le réflecteur (50) est parabolique, que le diaphragme est un diaphragme circulaire (58) composé de plusieurs anneaux de diaphragme (60) cylindriques et coaxiaux l'un par rapport à l'autre et à l'axe optique (54) du réflecteur (50), et que la source lumineuse (56) est susceptible d'être ajustée par rapport au foyer (52) de la parabole du réflecteur (50).
  7. Projecteur selon une ou plusieurs des revendications 1 à 6, caractérisé par le fait que la source lumineuse (18) est une lampe à décharge.
  8. Projecteur selon la revendication 7, caractérisé par le fait que l'intensité de la source lumineuse (18) est susceptible d'être électriquement réglée dans son domaine de luminosité autorisée.
  9. Projecteur selon une ou plusieurs des revendications 1 à 8, caractérisé par le fait qu'un diaphragme de couverture est susceptible d'être commandé par la manoeuvre de commande par lequel la source de lumineuse est susceptible d'être complètement couverte quand une basse intensité du projecteur est obtenue.
  10. Projecteur selon une ou plusieurs des revendications 1 à 9, caractérisé par le fait qu'une coulisse est susceptible d'être ajustée au moyen de l'arbre par laquelle un diaphragme de couverture est susceptible d'être déplacé devant la source lumineuse (18) quand une position prédéterminée de la faible illumination est obtenue.
  11. Projecteur selon une ou plusieurs des revendications 1 à 10, caractérisé par le fait que
    (a) un capteur (46) est prévu pour la luminosité du projecteur,
    (b) un moteur de commande (36) est susceptible d'être commandé par un régulateur (42) et,
    (c) le signal du capteur (46) et le signal du transmetteur de la valeur de consigne (44) sont appliqués au régulateur (42).
  12. Projecteur selon la revendication 11, caractérisé par le fait que
    (a) le régulateur (42) est appliqué aux moyens réglant la luminosité de la lampe de telle façon qu'en partant d'une valeur maximale de la luminosité de la lampe, lorsqu'on réduit la valeur de consigne, la luminosité de la lampe est d'abord réduite jusqu'à une valeur minimale techniquement possible et
    (b) quand on réduit encore la valeur de consigne le régulateur (42) commande le moteur de commande (36) afin d'ajuster la source lumineuse (18) en vue d'une illumination réduite de l'ouverture (24) du diaphragme.
EP90111058A 1989-06-16 1990-06-12 Projecteur à intensité lumineuse réglable de façon continue Expired - Lifetime EP0402845B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3919643A DE3919643A1 (de) 1989-06-16 1989-06-16 Scheinwerfer, der in seiner helligkeit stufenlos regelbar ist
DE3919643 1989-06-16

Publications (3)

Publication Number Publication Date
EP0402845A2 EP0402845A2 (fr) 1990-12-19
EP0402845A3 EP0402845A3 (fr) 1992-01-15
EP0402845B1 true EP0402845B1 (fr) 1995-05-24

Family

ID=6382840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111058A Expired - Lifetime EP0402845B1 (fr) 1989-06-16 1990-06-12 Projecteur à intensité lumineuse réglable de façon continue

Country Status (3)

Country Link
EP (1) EP0402845B1 (fr)
DE (2) DE3919643A1 (fr)
ES (1) ES2076258T3 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003923A1 (de) * 1990-02-09 1991-08-14 Andreas Laurenz Licht-streukoerper
DE10113385C1 (de) 2001-03-16 2002-08-29 Schott Glas Stufenlinsenscheinwerfer
US6595661B2 (en) * 2001-06-21 2003-07-22 Carl Zeiss Lamp housing
DE10241899B4 (de) * 2002-09-06 2006-06-29 Adb-Ttv Technologies N.V./S.A. Beleuchtungsvorrichtung
DE10241900A1 (de) * 2002-09-06 2004-03-25 Siemens Ag Beleuchtungsvorrichtung
ITRM20030271A1 (it) * 2003-05-30 2004-11-30 Sisti Lighting S P A De Dispositivo per la regolazione dell'intensita' luminosa per proiettori con lampade a scarica.
RU2302585C2 (ru) * 2003-12-22 2007-07-10 Шотт Аг Прожектор с линзой френеля с взаимосвязанным изменением расстояния между осветительными элементами
US7483220B2 (en) * 2003-12-22 2009-01-27 Auer Lighting Gmbh Optical arrangement with stepped lens
DE102004013962A1 (de) * 2003-12-22 2005-07-21 Schott Ag Stufenlinsenscheinwerfer mit gekoppelter Abstandsveränderung lichttechnischer Elemente
DE10361118B4 (de) * 2003-12-22 2011-12-22 Auer Lighting Gmbh Stufenlinsenscheinwerfer
DE10361116B4 (de) 2003-12-22 2010-06-17 Auer Lighting Gmbh Stufenlinsenscheinwerfer
ES2277706B1 (es) * 2004-09-24 2008-05-16 Eduard Vila Vallejo Dispositivo proyector ambiental portatil.
DE102005044237B4 (de) * 2005-09-16 2012-05-03 Auer Lighting Gmbh Modularer Scheinwerfer
DE102010041830A1 (de) * 2010-09-30 2012-04-05 Automotive Lighting Reutlingen Gmbh Steuer- und Regeleinrichtung für eine Gasentladungslampe eines Kraftfahrzeugscheinwerfers

Family Cites Families (10)

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US1455929A (en) * 1920-07-17 1923-05-22 Neff Edward Dunbar Spotlight-projecting device
FI41638C (fi) * 1963-05-08 1970-01-12 Mole Richardson England Ltd Televisio- ja filmistudiovalaisin
US3624386A (en) * 1969-01-21 1971-11-30 Strong Electric Corp The Arc lamp
AU2434471A (en) * 1970-06-03 1972-07-20 Berkey Technical Gu. K. ) Limited Improvements in or relating to spot lamps
US3930149A (en) * 1974-05-28 1975-12-30 Sterndent Corp Variable intensity dental light
GB2037415B (en) * 1978-12-15 1982-09-22 Furse & Co Ltd W Spotlight
US4338654A (en) * 1980-09-20 1982-07-06 Richard Logothetis Variable spot stage light
US4519020A (en) * 1983-11-14 1985-05-21 Little William D Variable magnification stage light
US4602321A (en) * 1985-02-28 1986-07-22 Vari-Lite, Inc. Light source having automatically variable hue, saturation and beam divergence
DE3719384A1 (de) * 1987-06-05 1988-12-22 Semperlux Gmbh Leuchtensystem aus frei einstell- und steuerbaren lichtquellen

Also Published As

Publication number Publication date
EP0402845A2 (fr) 1990-12-19
EP0402845A3 (fr) 1992-01-15
DE3919643A1 (de) 1991-01-03
ES2076258T3 (es) 1995-11-01
DE59009112D1 (de) 1995-06-29

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