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EP1241399B1 - Optical system for stepped lens projector - Google Patents

Optical system for stepped lens projector Download PDF

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Publication number
EP1241399B1
EP1241399B1 EP02003626A EP02003626A EP1241399B1 EP 1241399 B1 EP1241399 B1 EP 1241399B1 EP 02003626 A EP02003626 A EP 02003626A EP 02003626 A EP02003626 A EP 02003626A EP 1241399 B1 EP1241399 B1 EP 1241399B1
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EP
European Patent Office
Prior art keywords
reflector
light
focal point
optical system
stepped lens
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
EP02003626A
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German (de)
French (fr)
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EP1241399A2 (en
EP1241399A3 (en
Inventor
Rüdiger Kittelmann
Harry Wagener
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Auer Lighting GmbH
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Auer Lighting GmbH
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Publication date
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Publication of EP1241399A2 publication Critical patent/EP1241399A2/en
Publication of EP1241399A3 publication Critical patent/EP1241399A3/en
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Publication of EP1241399B1 publication Critical patent/EP1241399B1/en
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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
    • 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
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • 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
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • 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 invention relates to an optical system for Fresnel spotlights with an ellipsoidal reflector, a lamp and at least one Fresnel lens.
  • the photometrically relevant parts in ordinary optical systems for Fresnel lenses are lamp, Fresnel lens and spherical auxiliary reflector.
  • the lamp filament is substantially invariable in the spherical center of the spherical auxiliary reflector.
  • a part of the light emitted by the lamp is reflected back into this light and supports the light emission in the front half space.
  • This forward light is focused by the Fresnel lens.
  • the degree of light bundling is dependent on the distance between the Fresnel lens and the lamp. If the lamp filament is located in the focal point of the Fresnel lens, the narrowest light bundling results.
  • a quasi-parallel beam path also called a spot
  • the opening angle of the exiting light beam is steadily increased.
  • a diverging beam path also called flood
  • a disadvantage of such headlamps is the poor light output, especially in the spot position, since only a relatively small solid angle range of the lamp is detected by the Fresnel lens. It also affects disadvantageous in that the reflected light from the spherical reflector to a large extent hits the lamp filament itself, is absorbed there and additionally heats the lamp filament.
  • the object of the invention is to provide an optical system for Fresnel spotlights with an improved light efficiency, especially in spot, but also in Floodwolf while maintaining the uniformity of illuminance in the light field.
  • the object is achieved by an optical system for Fresnel spotlights with an ellipsoidal reflector, a lamp and at least one Fresnel lens, wherein the distance between the Fresnel lens and reflector to the Distance between the lamp and reflector in accordance with the setting of the opening angle of the light beam emerging from the headlight is in a defined dependency.
  • an ellipsoidal reflector with a large aperture is provided.
  • the spot position is adjusted by the fact that the lamp filament is located in the reflector-side focal point of the ellipsoid.
  • the reflected light from the reflector is almost completely united in the reflector-distant focal point of the El lipsoids.
  • the lamp filament located in the reflector-side focal point is actually imaged in the reflector's focal point of the ellipsoid.
  • the reflected light does not essentially hit the lamp filament.
  • the focal point of the Fresnel lens coincides with the focal point of the ellipsoid.
  • the light reflected from the reflector is almost completely detected by the Fresnel lens and emitted as a narrow spot light beam to the front.
  • the light output is thus considerably larger than in a conventional Fresnel lens spotlight.
  • the opening angle of the emerging from the Fresnel lens light beam can be increased almost arbitrarily by the lamp position with respect to the reflector on the one hand and the distance of the Fresnel lens to the reflector on the other hand is changed in a suitable manner.
  • these changes in distance must be made by a suitably chosen forced coupling.
  • the ellipsoidal reflector is made of a metallic or transparent material. Preferably, glass and polymeric materials are used. To produce a reflective surface, one of the two surfaces of the reflector is provided with a system of thin layers. As a result, visible radiation components are advantageously reflected and the invisible components, in particular the thermal radiation, transmitted.
  • a preferred embodiment of the invention is an optical system for Fresnel spotlights, wherein the light-reflecting surface of the reflector is structured light-scattering and no, one or two surfaces of the Fresnel lens are structured in a light-scattering manner.
  • An alternative preferred embodiment of the invention is an optical system for Fresnel spotlights, wherein at least one of the surfaces of the Fresnel lens is structured in a light-scattering manner and the light-reflecting surface of the reflector is not structured in a light-scattering manner.
  • the use of the optical system is provided in headlamps for film, stage, studio and photography.
  • the drawing consists of Fig. 1 and Fig. 2 ,
  • Fig. 1 shows the inventive optical system for Fresnel spotlights in spot position.
  • the optical system includes an ellipsoidal reflector (1), a lamp (2) and a Fresnel lens (3).
  • the emerging from the headlight beam (4) is indicated schematically.
  • the distances (a) between the stepped lens (3) and the reflector (1) and (b) between the lamp (2) and the reflector (1) are shown.
  • the spot position is adjusted by the fact that the lamp filament (2) is located in the reflector-side focal point (F1) of the ellipsoid (1).
  • the light reflected by the reflector (1) is almost completely united in the reflector-distant focal point (F2) of the ellipsoid (1).
  • the focal point of the Fresnel lens (F3) coincides with the focal point of the ellipsoid (F2).
  • the lamp filament (2) located in the reflector-side focal point (F1) is actually imaged in the reflector-distant focal point (F2) of the ellipsoid (1).
  • Fig. 2 shows the inventive optical system for Fresnel spotlights in Flood position.
  • the structure corresponds to the in Fig. 1 explained construction of an optical system.
  • the opening angle of the light beam (4) emerging from the Fresnel lens (3) can be increased almost arbitrarily by the distance (b) between the lamp (2) and the reflector (1) and the distance (a) be changed between the Fresnel lens (3) and the reflector (1).
  • the changes in distance are effected by a suitably selected forced coupling (in Fig. 1 and Fig. 2 not shown).
  • the lamp (2) is outside the reflector-side focal point (F1).
  • the focal point of the Fresnel lens (F3) does not coincide with the refractile focus of the ellipsoid (F2).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)

Description

Die Erfindung betrifft ein optisches System für Stufenlinsenscheinwerfer mit einem ellipsoiden Reflektor, einer Lampe und mindestens einer Stufenlinse.The invention relates to an optical system for Fresnel spotlights with an ellipsoidal reflector, a lamp and at least one Fresnel lens.

Die lichttechnisch relevanten Teile bei gewöhnlichen optischen Systemen für Stufenlinsenscheinwerfer sind Lampe, Stufenlinse (Fresnellinse) und sphärischer Hilfsreflektor. Dabei befindet sich die Lampenwendel im Wesentlichen unveränderlich im Kugelmittelpunkt des sphärischen Hilfsreflektors. Dadurch wird ein Teil des von der Lampe abgestrahlten Lichts in diese zurückreflektiert und die Lichtabstrahlung in den vorderen Halbraum unterstützt. Dieses nach vorn gerichtete Licht wird durch die Stufenlinse gebündelt. Der Grad der Lichtbündelung ist von dem Abstand zwischen der Stufenlinse und der Lampe abhängig. Befindet sich die Lampenwendel im Brennpunkt der Stufenlinse, so ergibt sich die engste Lichtbündelung. Dadurch wird ein quasiparalleler Strahlengang, auch Spot genannt, erhalten. Durch Verkürzung des Abstandes zwischen der Stufenlinse und der Lampe wird der Öffnungswinkel des austretenden Lichtbündels stetig vergrößert. Dadurch wird ein divergierender Strahlengang, auch Flood genannt, erhalten.The photometrically relevant parts in ordinary optical systems for Fresnel lenses are lamp, Fresnel lens and spherical auxiliary reflector. In this case, the lamp filament is substantially invariable in the spherical center of the spherical auxiliary reflector. As a result, a part of the light emitted by the lamp is reflected back into this light and supports the light emission in the front half space. This forward light is focused by the Fresnel lens. The degree of light bundling is dependent on the distance between the Fresnel lens and the lamp. If the lamp filament is located in the focal point of the Fresnel lens, the narrowest light bundling results. As a result, a quasi-parallel beam path, also called a spot, is obtained. By shortening the distance between the Fresnel lens and the lamp, the opening angle of the exiting light beam is steadily increased. As a result, a diverging beam path, also called flood, is obtained.

Nachteilig an solchen Scheinwerfern ist die schlechte Lichtausbeute insbesondere in der Spot-Stellung, da hier nur ein verhältnismäßig kleiner Raumwinkelbereich der Lampe durch die Stufenlinse erfasst wird. Außerdem wirkt sich nachteilig aus, dass das von dem sphärischen Reflektor reflektierte Licht zu einem großen Teil die Lampenwendel selbst trifft, dort absorbiert wird und die Lampenwendel zusätzlich aufheizt.A disadvantage of such headlamps is the poor light output, especially in the spot position, since only a relatively small solid angle range of the lamp is detected by the Fresnel lens. It also affects disadvantageous in that the reflected light from the spherical reflector to a large extent hits the lamp filament itself, is absorbed there and additionally heats the lamp filament.

Aus dem US-Patent 5 904 417 ist ein Beleuchtungsapparat mit einem Ellipsoid-Reflektor und einer Stufenlinse bekannt, bei welchem die Stufenlinse in axialer Richtung verschiebbar ist. Auch die Lampe ist unabhängig von der Stellung der Stufenlinse axial verschiebbar.From the U.S. Patent 5,904,417 a lighting apparatus with an ellipsoidal reflector and a Fresnel lens is known, in which the Fresnel lens is displaceable in the axial direction. The lamp is axially displaceable regardless of the position of the Fresnel lens.

Aufgabe der Erfindung ist es, ein optisches System für Stufenlinsenscheinwerfer mit einem verbesserten Lichtwirkungsgrad insbesondere in Spot-, aber auch in Floodstellung bei Erhaltung der Gleichmäßigkeit der Beleuchtungsstärke im Lichtfeld bereitzustellen.The object of the invention is to provide an optical system for Fresnel spotlights with an improved light efficiency, especially in spot, but also in Floodstellung while maintaining the uniformity of illuminance in the light field.

Die Lösung der Aufgabe erfolgt durch ein optisches System für Stufenlinsenscheinwerfer mit einem ellipsoiden Reflektor, einer Lampe und mindestens einer Stufenlinse, wobei der Abstand zwischen Stufenlinse und Reflektor zu dem Abstand zwischen Lampe und Reflektor nach Maßgabe des einzustellenden Öffnungswinkels des aus dem Scheinwerfer austretenden Lichtbündels in einer definierten Abhängigkeit steht.The object is achieved by an optical system for Fresnel spotlights with an ellipsoidal reflector, a lamp and at least one Fresnel lens, wherein the distance between the Fresnel lens and reflector to the Distance between the lamp and reflector in accordance with the setting of the opening angle of the light beam emerging from the headlight is in a defined dependency.

Mit dem erfindungsgemäßen optischen System wird ein deutlich verbesserter Lichtwirkungsgrad insbesondere in Spot-, aber auch in Floodstellung erreicht. Gleichzeitig wird die Gleichmäßigkeit der Beleuchtungsstärke im Lichtfeld erhalten.With the optical system according to the invention a significantly improved light efficiency is achieved in particular in spotlighting, but also in flood position. At the same time the uniformity of the illuminance in the light field is maintained.

Erfindungsgemäß ist ein ellipsoider Reflektor mit großer Apertur vorgesehen. Die Spot-Stellung wird dadurch eingestellt, dass sich die Lampenwendel im reflektorseitigen Brennpunkt des Ellipsoids befindet. Das von dem Reflektor reflektierte Licht wird nahezu vollständig im reflektorfernen Brennpunkt des El-lipsoids vereinigt. Die sich im reflektorseitigen Brennpunkt befindliche Lampenwendel wird reell im reflektorfernen Brennpunkt des Ellipsoids abgebildet. Das reflektierte Licht trifft im Wesentlichen nicht die Lampenwendel. Der Brennpunkt der Stufenlinse fällt mit dem Brennpunkt des Ellipsoids zusammen. Bei zweckmäßiger Wahl des Aperturwinkels von Reflektor und Stufenlinse wird das von dem Reflektor reflektierte Licht nahezu vollständig von der Stufenlinse erfasst und als enges Spot-Lichtbündel nach vorne abgestrahlt. Die Lichtausbeute ist damit erheblich größer als bei einem herkömmlichen Stufenlinsenscheinwerfer.According to the invention, an ellipsoidal reflector with a large aperture is provided. The spot position is adjusted by the fact that the lamp filament is located in the reflector-side focal point of the ellipsoid. The reflected light from the reflector is almost completely united in the reflector-distant focal point of the El lipsoids. The lamp filament located in the reflector-side focal point is actually imaged in the reflector's focal point of the ellipsoid. The reflected light does not essentially hit the lamp filament. The focal point of the Fresnel lens coincides with the focal point of the ellipsoid. With appropriate choice of the aperture angle of reflector and Fresnel lens, the light reflected from the reflector is almost completely detected by the Fresnel lens and emitted as a narrow spot light beam to the front. The light output is thus considerably larger than in a conventional Fresnel lens spotlight.

Der Öffnungswinkel des aus der Stufenlinse austretenden Lichtbündels kann nahezu beliebig vergrößert werden, indem die Lampenposition in Bezug zum Reflektor einerseits und der Abstand der Stufenlinse zum Reflektor andererseits in geeigneter Weise verändert wird. Damit die guten Eigenschaften herkömmlicher Stufenlinsenscheinwerfer in Bezug auf die Gleichmäßigkeit der Beleuchtungsstärke erhalten bleiben, müssen diese Abstandsveränderungen durch eine zweckmäßig gewählte Zwangskoppelung erfolgen.The opening angle of the emerging from the Fresnel lens light beam can be increased almost arbitrarily by the lamp position with respect to the reflector on the one hand and the distance of the Fresnel lens to the reflector on the other hand is changed in a suitable manner. In order to maintain the good properties of conventional Fresnel spotlights with respect to illuminance uniformity, these changes in distance must be made by a suitably chosen forced coupling.

Eine Ausführungsform der Erfindung besteht darin, dass der Ellipsoidreflektor aus einem metallischen oder transparenten Material besteht. Bevorzugt werden Glas und polymere Materialien verwendet. Zur Herstellung einer reflektierenden Oberfläche wird eine der beiden Oberflächen des Reflektors mit einem System dünner Schichten versehen. Dadurch werden vorteilhafterweise sichtbare Strahlungsanteile reflektiert und die unsichtbaren Anteile, insbesondere die Wärmestrahlung, durchgelassen.An embodiment of the invention is that the ellipsoidal reflector is made of a metallic or transparent material. Preferably, glass and polymeric materials are used. To produce a reflective surface, one of the two surfaces of the reflector is provided with a system of thin layers. As a result, visible radiation components are advantageously reflected and the invisible components, in particular the thermal radiation, transmitted.

Eine bevorzugte Ausführungsform der Erfindung ist ein optisches System für Stufenlinsenscheinwerfer, wobei die lichtreflektierende Oberfläche des Reflektors lichtstreuend strukturiert ist und keine, eine oder zwei Oberflächen der Stufenlinse lichtstreuend strukturiert sind. Durch die Aufbringung der Struktur wird die Gleichmäßigkeit der Beleuchtungsstärke im Lichtfeld verbessert. Durch die Aufbringung der Struktur wird die Gleichmäßigkeit der Beleuchtungsstärke im Lichtfeld verbessert.A preferred embodiment of the invention is an optical system for Fresnel spotlights, wherein the light-reflecting surface of the reflector is structured light-scattering and no, one or two surfaces of the Fresnel lens are structured in a light-scattering manner. By applying the structure, the uniformity of the illuminance in the light field is improved. By applying the structure, the uniformity of the illuminance in the light field is improved.

Eine alternative bevorzugte Ausführungsform der Erfindung ist ein optisches System für Stufenlinsenscheinwerfer, wobei mindestens eine der Oberflächen der Stufenlinse lichtstreuend strukturiert ist und die lichtreflektierende Oberfläche des Reflektors nicht lichtstreuend strukturiert ist. Durch die Aufbringung der Struktur wird die Gleichmäßigkeit der Beleuchtungsstärke im Lichtfeld verbessert.An alternative preferred embodiment of the invention is an optical system for Fresnel spotlights, wherein at least one of the surfaces of the Fresnel lens is structured in a light-scattering manner and the light-reflecting surface of the reflector is not structured in a light-scattering manner. By applying the structure, the uniformity of the illuminance in the light field is improved.

Erfindungsgemäß ist die Verwendung des optischen Systems in Scheinwerfern für Film, Bühne, Studio und Fotografie vorgesehen.According to the invention, the use of the optical system is provided in headlamps for film, stage, studio and photography.

Die Erfindung wird anhand einer beispielhaften Zeichnung näher erläutert. Die Zeichnung besteht aus Fig. 1 und Fig. 2.The invention will be explained in more detail with reference to an exemplary drawing. The drawing consists of Fig. 1 and Fig. 2 ,

Fig. 1 zeigt das erfindungsgemäße optische System für Stufenlinsenscheinwerfer in Spot-Stellung. Das optische System enthält einen ellipsoiden Reflektor (1), eine Lampe (2) und eine Stufenlinse (3). Das aus dem Scheinwerfer austretende Lichtbündel (4) ist schematisch angedeutet. Die Abstände (a) zwischen Stufenlinse (3) und Reflektor (1) und (b) zwischen Lampe (2) und Reflektor (1) sind dargestellt. Die Spot-Stellung wird dadurch eingestellt, dass sich die Lampenwendel (2) im reflektorseitigen Brennpunkt (F1) des Ellipsoids (1) befindet. Das von dem Reflektor (1) reflektierte Licht wird nahezu vollständig im reflektorfernen Brennpunkt (F2) des Ellipsoids (1) vereinigt. Der Brennpunkt der Stufenlinse (F3) fällt mit dem Brennpunkt des Ellipsoids (F2) zusammen. Die sich im reflektorseitigen Brennpunkt (F1) befindliche Lampenwendel (2) wird reell im reflektorfernen Brennpunkt (F2) des Ellipsoids (1) abgebildet. Fig. 1 shows the inventive optical system for Fresnel spotlights in spot position. The optical system includes an ellipsoidal reflector (1), a lamp (2) and a Fresnel lens (3). The emerging from the headlight beam (4) is indicated schematically. The distances (a) between the stepped lens (3) and the reflector (1) and (b) between the lamp (2) and the reflector (1) are shown. The spot position is adjusted by the fact that the lamp filament (2) is located in the reflector-side focal point (F1) of the ellipsoid (1). The light reflected by the reflector (1) is almost completely united in the reflector-distant focal point (F2) of the ellipsoid (1). The focal point of the Fresnel lens (F3) coincides with the focal point of the ellipsoid (F2). The lamp filament (2) located in the reflector-side focal point (F1) is actually imaged in the reflector-distant focal point (F2) of the ellipsoid (1).

Fig. 2 zeigt das erfindungsgemäße optische System für Stufenlinsenscheinwerfer in Flood-Stellung. Der Aufbau entspricht dem in Fig. 1 erläuterten Aufbau eines optischen Systems. Der Öffnungswinkel des aus der Stufenlinse (3) austretenden Lichtbündels (4) kann nahezu beliebig vergrößert werden, indem der Abstand (b) zwischen der Lampe (2) und dem Reflektor (1) und der Abstand (a) zwischen der Stufenlinse (3) und dem Reflektor (1) verändert werden. Damit die Gleichmäßigkeit der Beleuchtungsstärke erhalten bleibt, erfolgen die Abstandsveränderungen durch eine zweckmäßig gewählte Zwangskoppelung (in Fig. 1 und Fig. 2 nicht dargestellt). Die Lampe (2) liegt außerhalb des reflektorseitigen Brennpunktes (F1). Der Brennpunkt der Stufenlinse (F3) fällt mit dem reflektorfernen Brennpunkt des Ellipsoids (F2) nicht zusammen. Fig. 2 shows the inventive optical system for Fresnel spotlights in Flood position. The structure corresponds to the in Fig. 1 explained construction of an optical system. The opening angle of the light beam (4) emerging from the Fresnel lens (3) can be increased almost arbitrarily by the distance (b) between the lamp (2) and the reflector (1) and the distance (a) be changed between the Fresnel lens (3) and the reflector (1). In order to maintain the uniformity of the illuminance, the changes in distance are effected by a suitably selected forced coupling (in Fig. 1 and Fig. 2 not shown). The lamp (2) is outside the reflector-side focal point (F1). The focal point of the Fresnel lens (F3) does not coincide with the refractile focus of the ellipsoid (F2).

Claims (7)

  1. Optical system for stepped lens spotlights with an ellipsoidal reflector (1), a lamp (2) and at least one stepped lens (3), characterised in that by means of a forced coupling the distance (a) between the stepped lens (3) and reflector (1) is dependent in a defined manner on the distance (b) between the lamp (2) and reflector (1) according to the opening angle which is to be set of the light bundle (4) exiting the spotlight, wherein in a spot position the forced coupling causes the lamp filament (2) to be located in the reflector-side focal point (F1) of the ellipsoid (1) so that the light reflected from the reflector (1) comes together in the focal point (F2) of the ellipsoid (1) remote from the reflector, and the focal point of the stepped lens (F3) coincides with the focal point of the ellipsoid (F2), wherein the lamp filament (2) located in the reflector-side focal point (F1) is actually imaged in the focal point (F2) of the ellipsoid (1) remote from the reflector, and wherein in a flood position the forced coupling causes the lamp (2) to lie outside the reflector-side focal point (F1) and the focal point of the stepped lens (F3) does not coincide with the focal point of the ellipsoid (F2) remote from the reflector.
  2. Optical system for stepped lens spotlights as claimed in claim 1. wherein the distance (b) is set by moving the lamp (2) towards the vertex of the reflector (1) or away from the vertex of the reflector (1).
  3. Optical system for stepped lens spotlights as claimed in claim 1 or 2, wherein the reflector (1) consists of a metal or transparent material.
  4. Optical system for stepped lens spotlights as claimed in at least one of claims 1 to 3, wherein at least one of the two surfaces of the reflector (1) is provided with a system of thin layers.
  5. Optical system for stepped lens spotlights as claimed in at least one of claims 1 to 4, wherein the light-reflecting surface of the reflector (1) is structured in a light-scattering manner and none, one or two surfaces of the stepped lenses (3) are structured in a light-scattering manner.
  6. Optical system for stepped lens spotlights as claimed in at least one of claims 1 to 4, wherein at least one of the surfaces of the stepped lens (3) is structured in a light-scattering manner and the light-reflecting surface of the reflector (1) is not structured in a light-scattering manner.
  7. Use of an optical system as claimed in at least one of claims 1 to 6 in spotlights for film, stage, studio and photography.
EP02003626A 2001-03-16 2002-02-16 Optical system for stepped lens projector Expired - Lifetime EP1241399B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10113385A DE10113385C1 (en) 2001-03-16 2001-03-16 Fresnels
DE10113385 2001-03-16

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EP1241399A2 EP1241399A2 (en) 2002-09-18
EP1241399A3 EP1241399A3 (en) 2005-04-13
EP1241399B1 true EP1241399B1 (en) 2008-05-28

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US (1) US6899451B2 (en)
EP (1) EP1241399B1 (en)
JP (2) JP2002324410A (en)
DE (2) DE10113385C1 (en)

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DE202009011500U1 (en) 2009-08-20 2010-12-30 Arnold & Richter Cine Technik Gmbh & Co. Betriebs Kg Optical system for an LED light

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DE50212306D1 (en) 2008-07-10
JP2002324410A (en) 2002-11-08
US6899451B2 (en) 2005-05-31
JP2008288215A (en) 2008-11-27
JP4792486B2 (en) 2011-10-12
EP1241399A2 (en) 2002-09-18
EP1241399A3 (en) 2005-04-13
DE10113385C1 (en) 2002-08-29

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