EP3438524A1 - Luminaire - Google Patents

Abstract

The invention relates inter alia to a luminaire (10) for illuminating building surfaces (17) or building part surfaces, comprising a housing (11), at least one light source, in particular an LED (12, 12a, 12b, 12c), and at least one collimator optics (15 , 15a, 15b, 15c) for focusing the light emitted by the light source. The special feature is, inter alia, that in the light path behind the collimator optics at least two lens plates (18, 19) are provided, on each of which a plurality of lens elements (22a, 22b, 22c, 23a, 23b, 23c), in particular grouped, is arranged , wherein the distance (32) between the two lens plates by means of an adjusting device (20) is changeable, and wherein the lamp in different distances positions of the lens plates different light distributions (37, 38, 39, 50a, 50b, 50c) provides.

Description

The invention initially relates to a luminaire according to the preamble of claim 1.

Such lights have been developed and manufactured by the applicant for quite some time.

Luminaires of the generic type are for example in the German patent applications and patents DE 10 2008 063 369 B1 . DE 10 2010 022 477 A1 . DE 10 2009 060 897 B1 . DE 10 2010 008 359 A1 . EP 2 327 927 B1 . DE 10 2012 006 999 A1 . DE 10 2013 011 877 B1 and DE 10 2013 021 308 B1 described, all of which date back to the applicant.

It is already known from the prior art documents of the generic type that the light originating from a light source, in particular from an LED, is collimated by a collimator optics, and then supplied to a tertiary optic in the form of a lens plate. Such a lens plate is for example in the EP 2 204 604 B1 described.

In order to change the emission characteristics of the luminaire, that is to say the light distribution which can be generated with the luminaire, it is known to use lens plates with different lens elements. By replacing a first lens plate with a second lens plate, which has lens elements with different radii of curvature or other facets, for example, the radiation angle of the lamp can be changed.

Starting from a lamp of the generic type, the object of the invention is a known lamp such to further develop that the lamp allows a change in their emission characteristics in a comfortable way.

The invention solves this problem with the features of claim 1, in particular those of the characterizing part, and is accordingly characterized in that in the light path behind the bundling optics, in particular a collimator optics, at least two lens plates are provided, on each of which a plurality of lens elements, in particular grouped , is arranged, wherein the distance between the two lens plates is changeable by means of an adjusting device, and wherein the lamp provides different light distributions in different spaced positions of the lens plates.

The principle of the invention is to provide two lens plates. The lens plates are serially connected in series. The light emitted by the focusing optics penetrates first the first lens plate and then the second lens plate. Each of the two lens plates has a plurality of lens elements. The lens elements are in particular grouped, further arranged in particular according to a predetermined grid, or according to a predetermined structure, grouped.

According to the principle of the invention, the luminaire comprises at least one bundling optical system. Bundling optics is understood to mean a device which can concentrate the light emitted by the light source. This may in particular be a collimator optics, that is to say a lens element which effects the bundling. Alternatively, the bundling optics may also be provided by a reflector element.

The decisive factor is that of the light source and the bundling optics, which together also called light drive be emitted, parallel or substantially parallel light or approximately parallel light.

Insofar as the invention is described in the context of this patent application with reference to a collimator optics, this should only be understood as an example of bundling optics in general.

The luminaire according to the invention further comprises an adjusting device. By means of the adjusting device, the distance between the two lens plates is changeable. In a first variant, the adjustment device can displace the first lens plate relative to the second lens plate fixedly arranged on the housing, or alternatively displace the second lens plate relative to the first lens plate fixedly arranged relative to the housing. According to a further variant, both lens plates are displaceable relative to the housing, and are displaced by the adjustment by changing their distance from each other.

The principle is further that the lamp provides different light distributions in different distances of the lens plates from each other. Thus, at a first distance position of the two lens plates, the luminaire can provide a first emission characteristic, for example a narrow light emission, for example a spot emission characteristic, and a second light distribution, for example a larger emission angle, in particular a flood or a second different distance position of the lens plates Provide wideflood light distribution.

As a luminaire for illuminating building surfaces, any lights are considered as floor, wall or ceiling light of a building, possibly as a spotlight or recessed light, the Illumination of a building surface or a part of the building serve. Likewise, these are understood to be lights, the surfaces of an outdoor area of a building, ie z. B. parking areas, green areas or roads, can illuminate. Under illuminating building surfaces within the meaning of claim 1 also understood to be illuminated paintings or art objects.

The lamp may be formed for example as a radiator, and z. B. ceiling side in a building room or on the floor, even in an outdoor room, be arranged variable position and lockable. But it can also be designed as a downlight, for example, and illuminate floor areas or wall areas of the building room.

The lamp comprises a housing in which at least the light source is housed. In particular, the lamp optionally also includes self-evident components, such. B. a socket for the light source, z. B. in the case of a light source designed as a LED board, and electronic controls or other electronic components. The lamp may also have a power supply. The lamp may be associated with an integrated or external operating device, which is arranged in a separate housing, or in the same housing.

As the light source one or more LEDs are preferably provided. Alternatively, other light sources, such as lasers, come into consideration. Preferably, point-like, or almost punctiform, light sources are used.

As a light source so-called COB LEDs (ie chip on board LEDs) come into consideration. These can, for example, also provide a bundling optical system in the sense of the invention with a reflector.

The light source forms a unit together with the collimator optics. The collimator optics serve to concentrate the light emitted by the light source, in particular by the LED. The collimator optics may be a conventional collimator optics in the case of using an LED as a light source, as disclosed in the applicant's copyrights described at the outset, the contents of which are hereby included in the disclosure content of this patent application.

In the context of this patent application, the light source, together with the bundling optics, in particular the collimator optics, is also referred to as a light drive. In particular, the light drive serves to project parallel, or essentially parallel, light onto the input side of a first lens plate. The lens plates are both transparent or translucent, and consist for. B. of a transparent plastic, or glass. Preferably, the lens plates are each made of plastic, z. B. of PMMA, or acrylic glass, or a comparable plastic provided, and may be formed in particular of an injection molded part.

The two lens plates may be identical or substantially identical. In a variant of the invention, the two lens plates are formed differently.

The light emitted from the collimator optics enters the entrance surface of the first lens plate and exits through the exit side of the first lens plate. From there, it is directed to the entrance side of the second lens plate, and exits through the exit surface of the second lens plate.

In the light path behind the second lens plate, the lamp can still have a cover glass. But of the invention, in particular lamps are included, in which no further optical elements are arranged in the light path behind the second lens plate. Of course, the invention includes lamps in which a diffuser film or similar elements are arranged in the light path behind the second lens plate.

According to the invention, an adjusting device is provided. By means of the adjusting device, the distance between the two lens plates can be changed. The adjusting device may be driven by a motor, or change the distance between the two lens plates due to a manual operation. The adjustment can be for example a few millimeters. The lens plates are adjustable at least between a first distance position and a second distance position. In a first distance position of the two lens plates, the luminaire generates a first light distribution, and in a second, different distance position of the two lens plates, the luminaire generates a second, different from the first distribution. The two different light distributions may, for example, comprise different emission angles of the luminaire.

In a variant of the invention, the distance between the two lens plates is continuous, and further preferably substantially continuously, changeable. In an alternative embodiment of the invention, the distance between the two lens plates in discrete steps, that is, z. B. gradually, changeable.

On the two lens plates in each case numerous lens elements are arranged. The lens elements may, for example, be provided by spherically or aspherically curved facets. In a variant of the invention is in each case a lens element on the first lens plate associated with a lens element on the second lens plate. The light incident on the lens element of the first lens plate from the collimator optics is directed in this variant exclusively to an opposite lens element on the second lens plate. This unambiguous assignment of two lens elements on the different lens plates is also preserved for different distances according to a variant of the invention.

Due to the fact that the collimator lens irradiates parallel or substantially parallel light onto the first lens plate, the individual beam bundles are comparable:
Each or nearly every lens element on the first lens plate has a lens element fixedly secured to the second lens plate. Corresponding pairs of opposing lens elements each show the same optical behavior at different distances of the lens plates from each other.

The fixed assignment of the lens elements of the first lens plate to the lens elements of the second lens plate is ensured by the fact that during the change in distance, the rotational position of the two lens plates is not changed relative to each other. This can be ensured by a positioning device.

The lens elements according to the invention can be arranged in each case on one or in each case on both sides of the lens plates.

If the lens elements are arranged only on one side of the lens plate, they may be arranged facing each other or arranged facing away from each other.

Of the invention is further encompassed when the lens elements of a lens plate are all identical or similar to each other. But of the invention is also encompassed when the lens plates carry different lens elements or more groups of different lens elements, wherein the lens elements of a group are identical.

The lens elements of a lens plate may for example have an identical radius, so that all the lens elements of a lens plate have an identical focal length.

The lens elements of the respective other lens plate may have the same or a different radius. In a variant of the invention, the focal length of the lens elements or lens plate adjacent to the collimating optics is greater than the focal length of the lens elements of the lens plate remote from the collimating optics.

The individual lens elements can be provided, for example, by spherical or aspherical arches, for example also by paraboloid rotors. The individual lens elements can be approximately described by a spherical shape or by a radius.

According to an advantageous embodiment of the invention, the adjusting device comprises a motor, in particular electromotive, drive. The adjusting device is equipped, for example, with an electric motor which can take care of an immediate displacement of one of the two lens plates relative to the other lens plate. The drive can cooperate with a controller that can receive control commands. For this purpose, for example, be provided that directly on the lamp, in particular in the housing of the lamp, or on an enclosure of the operating device, or in direct association with the lamp, an actuating device is provided which allows a user to enter directly or indirectly control commands for changing the Lichtabstrahlcharakteristik the lamp. Alternatively, the drive via a central lighting control system, eg. B. from a distant or distanced from the light command center, z. B. be addressed by a lighting control center.

According to a further advantageous embodiment of the invention, the adjusting device comprises a manually operable adjusting element. Here, for example, by a manual operation, eg. Example, by a rotary switch, a knob, a rotatable adjusting ring, or another actuator or actuator, are provided for a change in distance between the two lens plates.

According to a further advantageous embodiment of the invention, the adjusting device is associated with a positioning device, which ensures a retention of the relative rotational position between the two lens plates in carrying out a change in distance between the two lens plates. The relative rotational position of a lens plate relative to the other lens plate is maintained during the change in distance. This can, for example, provide a rotation prevention, the z. B. guide rods or corresponding receptacles or the like.

Also, axial bearings can provide for the desired axial movement of the two lens plates relative to each other without performing a rotary motion.

According to a further advantageous embodiment of the invention, the different light distributions comprise different Beam angle of the lamp. For example, it can be provided that the luminaire generates a substantially rotationally symmetrical light distribution, a first emission angle of, for example, 8 ° or 10 ° and a second emission angle of, for example, 60 ° or 90 ° being provided. In between, any number of continuously changed emission angles corresponding to different distances between the two lens plates relative to one another can be achieved.

The different radiation angles can, according to an advantageous embodiment of the invention z. B. light distributions between Spot and Wideflood include.

A change in the light distribution according to the invention can be, for example, a change in the emission angle from a spot to a flood characteristic, or from a flood to a wideflood characteristic, or from a spot characteristic via a flood characteristic to a wideflood characteristic include. According to the invention, a spot characteristic comprises, in particular, emission angles of less than 30 °, in particular a flood light distribution comprises approximately emission angles between 30 and 45 °, and a wide-flood light distribution in particular comprises emission angles between 45 and 70 °.

According to an advantageous embodiment of the invention, in particular emission angle between a spot distribution of about 8 ° and a Widefloodverteilung corresponding to a beam angle of about 65 ° are continuously changeable.

For the sake of good order, it is pointed out that, in particular, that angle which is referred to as the opening angle in the expert sense and which represents the so-called "full width half max" value is referred to as the emission angle or angle of a light distribution in the sense of the present invention. These are that is to say the value of the light emission angle at which the light intensity has dropped to about half of the maximum light intensity.

According to an advantageous embodiment of the invention, the distance between the lens plates is continuously changeable. This can be ensured by a continuously operating adjustment. With a continuous change of the distance between the two lens plates, a continuous change in the emission characteristics of the luminaire, in particular a continuous change in the emission angle, can be achieved.

According to a further advantageous embodiment of the invention, one of the two lens plates is fixedly arranged relative to the housing, and the other lens plate is displaceable by means of the adjusting device relative to the other lens plate and / or relative to the housing.

This allows for a particularly precise adjustment of the lens plates are provided relative to each other.

According to a further advantageous embodiment of the invention, the lens elements comprise facets on at least one of the two lens plates. In particular, the facets are curved. Advantageously, all or almost all lens elements are formed as facets. Further advantageously, all or almost all facets are identical.

The facets can be spherical or aspherical. In particular, they can also be approximated to a sphere. Further, the facets may be provided by a paraboloid of revolution, for example having a parabolic or substantially parabolic cross-section.

According to a further advantageous embodiment of the invention, a lens element can be assigned a focal length. It can advantageously be provided that each or almost each of the lens elements is assigned the same or nearly the same focal length.

Further advantageously, the adjustment, along which a change in the distance between the two lens plates can be made from each other, about the order of two focal lengths. This means that the lens plates are displaceable between a first distance position in which they contact one another and in a second distance position in which they are spaced approximately two focal distances from one another.

According to a further advantageous embodiment of the invention, a respective lens element of a lens plate is associated with a lens element of the other lens plate. The assignment can in particular be made firmly. This means that even during a change in the distance between two lens plates, the assignment is retained. In this case, it can further be advantageously provided that the light falling from the collimator optics onto a specific lens element of the first lens plate is deflected exclusively toward a specific, opposite lens element of the second lens plate. Further advantageously, this fixed assignment is invariable along the entire adjustment path.

According to a further advantageous embodiment of the invention, the assignment is made such that light components emanating from the collimator, meet a lens element of the first lens plate, and are directed by this only to a lens element of the second lens plate.

According to a further advantageous embodiment of the invention, the assignment of the lens elements of the first lens element is maintained to the lens elements of the second lens element with a change in the distance between the lens plates.

According to a further advantageous embodiment of the invention, the lens elements comprise lenticular facets on at least one of the two lens plates. These are axially elongated, cylindrical facets which are curved along a first plane and along a second, transversely thereto plane, not curved, or at most slightly curved.

The invention relates in a further aspect to a method according to claim 15.

The invention has for its object to provide a method by which a change in the emission characteristics of a luminaire can be reached in a comfortable manner.

The invention solves this problem with the features of claim 15.

To avoid repetition, reference is made to the above, to claims 1 to 14 valid statements and remarks, which apply in an analogous manner to the invention according to claim 15.

The object described above is further achieved by a luminaire according to claim 16.

The principle here is to provide instead of two arranged in the light path behind the bundling optic lens plates a plurality of lens elements directly to the collimator, especially on the output side or light exit side, and the second lens plate relative to the collimator optics for the purpose of changing the radiation characteristics of the luminaire means to relocate an adjustment.

Incidentally, to explain this invention and to avoid repetition, reference is made to the above remarks for luminaires of claims 1 to 14, whose explanations and feature advantageous embodiment are equally applicable to the invention according to claim 16 application.

Further advantages of the invention will become apparent from the non-cited subclaims, and with reference to the following description of the numerous embodiments illustrated in the figures.

Fig. 1

in einer teilgeschnittenen, blockschaltbildartigen, schematischen Ansicht ein erstes Ausführungsbeispiel einer erfindungsgemäßen Leuchte mit einem Lichtantrieb umfassend eine LED und einen Kollimator und zwei mittels einer Verstelleinrichtung relativ zueinander verstellbaren Linsenplatten,

Fig. 2

in einer abgebrochenen, schematischen Unteransicht, etwa entlang Ansichtspfeil II in Fig. 1, eine Linsenplatte in Draufsicht unter Andeutung der relativen Positionen der Lichtantriebe,

Fig. 3

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Linsenplatte in einer Darstellung gemäß Fig. 2,

Fig. 4

in einer teilgeschnittenen, schematischen Ansicht einen Ausschnitt aus der Leuchte der Fig. 1, mit angedeuteter Verstelleinrichtung und den beiden Linsenplatten in einer ersten maximalen Abstandsstellung,

Fig. 5

ein Ausführungsbeispiel der Fig. 4 in einer zweiten Abstandsstellung,

Fig. 6

das Ausführungsbeispiel der Fig. 5 in einer dritten Abstandsstellung unter höchstmöglicher Annäherung der beiden Linsenplatten aneinander,

Fig. 7

schematisch eine auszuleuchtende Gebäudefläche mit der von der Leuchte der Fig. 1 auf der Gebäudefläche generierten Lichtverteilung entsprechend der Abstandsstellung der beiden Linsenplatten gemäß Fig. 4,

Fig. 8

die Lichtverteilung in einer Darstellung gemäß Fig. 7 entsprechend der Abstandsstellung der beiden Linsenplatten gemäß der Fig. 5,

Fig. 9

die Lichtverteilung auf der Gebäudefläche entsprechend einer Darstellung der Fig. 7 entsprechend einer Abstandsstellung der beiden Linsenplatten gemäß Fig. 6,

Fig. 10

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Leuchte unter Veranschaulichung einer manuell betätigbaren Verstelleinrichtung in einer teilgeschnittenen, schematischen Ansicht unter Veranschaulichung eines Verstellrings,

Fig. 11

in einer teilgeschnittenen, schematischen Ansicht einen Schnitt durch die Leuchte der Fig. 10 etwa entlang Schnittlinie XI-XI in Fig. 10,

Fig. 12

eine teilgeschnittene, schematische Draufsicht auf die Leuchte der Fig. 10 etwa entlang Ansichtspfeil XII in Fig. 10,

Fig. 13

eine abgebrochene, teilgeschnittene, schematische Ansicht nur des Verstellringes in Einzeldarstellung etwa entlang Ansichtsschnittlinie XIII-XIII der Fig. 12,

Fig. 14

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Linsenplatte in einer Darstellung gemäß Fig. 2 unter Veranschaulichung von Lentikularlinsen,

Fig. 15

eine teilgeschnittene, schematische Ansicht der Linsenplatten etwa gemäß Schnittlinie XV-XV in Fig. 14,

Fig. 16

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Leuchte unter Verwendung von zwei Linsenplatten gemäß Fig. 14 in einer Darstellung gemäß Fig. 4,

Fig. 17

eine Veranschaulichung der Lichtverteilung der von der Leuchte der Fig. 16 erzeugten Lichtverteilung in einer Darstellung gemäß Fig. 7,

Fig. 18

die Leuchte der Fig. 16 mit einer geänderten Abstandsstellung der beiden Linsenplatten zueinander,

Fig. 19

die Lichtverteilung der Leuchte in einer Darstellung gemäß Fig. 17 bei einer Abstandsstellung der Linsenplatten gemäß Fig. 18,

Fig. 20

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Linsenplatte unter Verwendung von Lentikularfacetten in einer Darstellung gemäß Fig. 14,

Fig. 21

eine vergrößerte schematische Einzeldarstellung einer einzigen Lentikularfacette gemäß Teilkreis XXI in Fig. 20,

Fig. 22

eine teilgeschnittene Ansicht durch die Facette der Fig. 21 entlang Schnittlinie XII-XII in Fig. 21,

Fig. 23

eine teilgeschnittene Ansicht durch die Facette der Fig. 21 entlang Schnittlinie XXIII-XXIII in Fig. 21,

Fig. 24

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Leuchte unter Verwendung einer ersten, gemäß Fig. 24 unteren, Linsenplatte gemäß Fig. 20 und einer zweiten Linsenplatte gemäß Fig. 14 in einer Darstellung gemäß Fig. 16,

Fig. 25

die Leuchte der Fig. 24 mit einer geänderten Abstandsstellung der Linsenplatten zueinander,

Fig. 26

die Lichtverteilung der Leuchte der Fig. 24 auf der auszuleuchtenden Gebäudewand bei einer Abstandsstellung gemäß Fig. 24,

Fig. 27

die Lichtverteilung auf der Gebäudewand bei der Abstandsstellung der Fig. 21,

Fig. 28

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Leuchte in einer Darstellung gemäß Fig. 1, wobei in diesem Ausführungsbeispiel der Lichtantrieb durch eine Chip on Board LED und einen Reflektor als Bündelungsoptik bereitgestellt ist,

Fig. 29

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Leuchte in einer Darstellung gemäß Fig. 1, wobei hier anstelle zweier Linsenplatten eine Kollimatoroptik mit unmittelbar daran angebrachten Linsenelementen und eine unter einem veränderbaren Abstand hierzu angeordnete Linsenplatte vorgesehen ist,

Fig. 30

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Linsenplatte in einer Darstellung gemäß Fig. 2, unter Verwendung von zentrisch angeordneten ringförmigen Lentikullarlinsen,

Fig. 31

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Leuchte in einer Darstellung gemäß Fig. 1, wobei die der Kollimatoroptik ferne Linsenplatte - im Unterschied zu der Darstellung der Fig. 1 - um 180°gedreht oder geometrisch invertiert angeordnet ist, mithin die Linsenelemente voneinander weggewandt sind,

Fig. 32

ein weiteres Ausführungsbeispiel in einer Darstellung gemäß Fig. 31, wobei die Linsenelemente der der Kollimatoroptik näheren Linsenplatte einen größeren Radius und die Linsenelemente der gegenüberliegenden zweiten Linsenplatte einen demgegenüber kleineren Radius aufweisen,

Fig. 33

eine teilgeschnittene, abgebrochene und schematische Darstellung eines Ausschnittes der Linsenplatte gemäß Fig. 31, etwa gemäß Teilkreis XXXIII in Fig. 31, und

Fig. 34

in einer Darstellung gemäß Fig. 31, ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Leuchte, bei der die Linsenelemente beider Linsenplatten auf der jeweiligen, der Kollimatoroptik abgewandten Seite der jeweiligen Linsenplatte angeordnet sind.

Show:

Fig. 1

2 shows a partially cutaway, block diagram-like, schematic view of a first exemplary embodiment of a luminaire according to the invention with a light drive comprising an LED and a collimator and two lens plates which can be adjusted relative to one another by means of an adjusting device,

Fig. 2

in a broken, schematic bottom view, approximately along view arrow II in Fig. 1 , a lens plate in plan view with reference to the relative positions of the light engines,

Fig. 3

a further embodiment of a lens plate according to the invention in a representation according to Fig. 2 .

Fig. 4

in a partially cut, schematic view of a section of the lamp Fig. 1 , with indicated adjusting device and the two lens plates in a first maximum distance position,

Fig. 5

an embodiment of the Fig. 4 in a second distance position,

Fig. 6

the embodiment of Fig. 5 in a third distance position with the highest possible approximation of the two lens plates together,

Fig. 7

schematically a building surface to be illuminated with the light from the Fig. 1 generated on the building surface light distribution according to the distance position of the two lens plates according to Fig. 4 .

Fig. 8

the light distribution in a representation according to Fig. 7 according to the distance position of the two lens plates according to the Fig. 5 .

Fig. 9

the light distribution on the building surface according to a representation of Fig. 7 according to a distance position of the two lens plates according to Fig. 6 .

Fig. 10

a further embodiment of a lamp according to the invention illustrating a manually operable adjusting device in a partially sectioned, schematic view illustrating an adjusting ring,

Fig. 11

in a partially sectioned, schematic view a section through the light of Fig. 10 approximately along section line XI-XI in Fig. 10 .

Fig. 12

a partially cut, schematic plan view of the lamp of Fig. 10 approximately along view arrow XII in Fig. 10 .

Fig. 13

a broken, partially cut, schematic view only of Verstellringes in individual representation approximately along view section line XIII-XIII of Fig. 12 .

Fig. 14

a further embodiment of a lens plate according to the invention in a representation according to Fig. 2 illustrating lenticular lenses,

Fig. 15

a partially cut, schematic view of the lens plates approximately according to section line XV-XV in Fig. 14 .

Fig. 16

a further embodiment of a lamp according to the invention using two lens plates according to Fig. 14 in a representation according to Fig. 4 .

Fig. 17

an illustration of the light distribution of the light from the Fig. 16 generated light distribution in a representation according to Fig. 7 .

Fig. 18

the light of the Fig. 16 with a changed distance position of the two lens plates to each other,

Fig. 19

the light distribution of the lamp in a representation according to Fig. 17 at a distance position of the lens plates according to Fig. 18 .

Fig. 20

a further embodiment of a lens plate according to the invention using lenticular facets in a representation according to Fig. 14 .

Fig. 21

an enlarged schematic single representation of a single lenticular facet according to circle XXI in Fig. 20 .

Fig. 22

a partially sectioned view through the facet of the Fig. 21 along section line XII-XII in Fig. 21 .

Fig. 23

a partially sectioned view through the facet of the Fig. 21 along section line XXIII-XXIII in Fig. 21 .

Fig. 24

a further embodiment of a lamp according to the invention using a first, according to Fig. 24 lower, lens plate according to Fig. 20 and a second lens plate according to Fig. 14 in a representation according to Fig. 16 .

Fig. 25

the light of the Fig. 24 with a changed distance position of the lens plates to one another,

Fig. 26

the light distribution of the luminaire Fig. 24 on the building wall to be illuminated at a distance position according to Fig. 24 .

Fig. 27

the light distribution on the building wall in the distance position of Fig. 21 .

Fig. 28

a further embodiment of a lamp according to the invention in a representation according to Fig. 1 , wherein in this embodiment the light drive is provided by a chip on board LED and a reflector as bundling optics,

Fig. 29

a further embodiment of a lamp according to the invention in a representation according to Fig. 1 , wherein here, instead of two lens plates, a collimator optics with lens elements directly attached thereto and a lens plate arranged at a variable distance therefrom is provided,

Fig. 30

a further embodiment of a lens plate according to the invention in a representation according to Fig. 2 , using centrically arranged annular lenticular lenses,

Fig. 31

a further embodiment of a lamp according to the invention in a representation according to Fig. 1 , wherein the collimator optics far lens plate - in contrast to the representation of the Fig. 1 is rotated by 180 ° or is arranged geometrically inverted, thus the lens elements are facing away from each other,

Fig. 32

a further embodiment in a representation according to Fig. 31 wherein the lens elements of the lens plate closer to the collimator optics have a larger radius and the lens elements of the opposite second lens plate have a smaller radius,

Fig. 33

a partially sectioned, broken and schematic representation of a section of the lens plate according to Fig. 31 , according to part circle XXXIII in Fig. 31 , and

Fig. 34

in a representation according to Fig. 31 , Another embodiment of a lamp according to the invention, in which the lens elements of both lens plates on the respective side facing away from the collimator optics side of the respective lens plate are arranged.

Embodiments of the invention are described by way of example in the following description of the figures, also with reference to the drawings. For reasons of clarity, identical or comparable parts or elements or regions with the same reference numerals, sometimes with the addition of small letters, are also referred to - even if different embodiments are involved.

Features which are described only in relation to an embodiment can be provided in the context of the invention in any other embodiment of the invention. Such modified embodiments are - even if they are not shown in the drawings - covered by the invention.

All disclosed features are essential to the invention. In the disclosure of the application, the disclosure content of the associated priority documents (copy of the prior application) and the cited references and the described devices of the prior art are hereby incorporated in full, also for the purpose of one or more features of these documents in one or more Claims of the present application to include.

An embodiment of a lamp according to the invention is first based on the Fig. 1 explains:
There is only very schematically illustrated a lamp 10, which has a housing 11. Within the only aborted shown and indicated housing 11, an LED 12 is arranged on a schematically indicated board 13. The LED is connected via unillustrated power supply lines (in Fig. 10 z. B. designated 14) supplied with the required operating voltage. Other electronic components that are provided for generating the operating voltage required for the LED are not shown for the sake of simplicity.

The LED emits light over a large solid angle range of, for example, 180 °. This should be indicated by the light rays 55a, 55b, 55c. The LED 12 is located in a cavity 57 of a collimating optical system 15 providing collimating optics Collimator optics 15 includes total reflection surfaces 58 and a ceiling portion 59. Overall, the collimator lens 15 together with the LED 12 is a light drive, which serves to generate a substantially parallel light beam 27.

Within the lamp housing 11, a first lens plate 18 and a second lens plate 19 are also arranged beyond. The parallel light beam 27 emitted by the LED 12 or by the exit surface 56 of the collimator optical system 15 drops as a parallel partial light beam 60 onto the light entry surface 28 of the first lens plate 18, passes through it, and exits in the area of the light exit surface 29 of the first lens plate 18. From there, the light is incident on the light entry surface 30 of the second lens plate 19 and exits through the light exit surface 31 of the second lens plate 19.

In the light path behind the second lens plate 19, no further optical element is arranged in the embodiments of the luminaire according to the invention shown in the figures. From there, the light can strike directly on a building surface 17 to be illuminated, which is only schematically and not to scale in Fig. 1 is indicated.

In the area of the light exit opening 16 of the luminaire 10, therefore, no cover glass or the like is provided in this exemplary embodiment. Here, the second lens plate 19 may function as a kind of cover glass of the lamp 16.

The distance between the first lens plate 18 and the second lens plate 19 is denoted by 32 in the figures. Measured here is z. Example, the distance between the light entry surface 29 of the first lens plate 18 and the light entrance surface 30 of the second lens plate 19. Other reference points are encompassed by the invention.

According to the invention, the distance 32 between the two lens plates 18, 19 by means of an adjustment device 20 is variable. The adjusting device 20 may include a motor drive 21, which in Fig. 1 is merely indicated. The motor drive 21 can receive control commands from a lighting control, for example via a signal or control line, not shown.

The adjusting device 20 may also include a manually addressable actuator, and completely dispense with a motor drive. Reference to the still to be presented in detail embodiment of FIGS. 10 to 13 Such an actuator is presented a purely manually acting adjustment.

On the training of the adjustment but it does not matter according to the invention. The invention is fundamentally about the fact that the two lens plates 18, 19 are displaceable relative to one another in the axial direction Y while changing their distance 32 from one another.

As evidenced by the embodiment of Fig. 1 It can be seen that along the light entry surface 28 of the first lens plate 18, a plurality of lens elements in the form of curved facets 22a, 22b, 22c are arranged. The arrangement of the facets results for example from the different variants of the embodiments of FIGS. 2 and 3 , The lens elements 22a, 22b, 22c in the form of curved facets are arranged directly adjacent to one another. The invention also includes when slight distances are provided between the lens elements 22a, 22b, 22c.

Also on the second lens plate 19, a plurality of lens elements 23a, 23b, 23c are arranged. The two lens plates 18, 19 may be identical.

The individual facets 22a, 22b, 22c of the first lens plate 18 and the individual facets 23a, 23b, 23c of the second lens plate 19 can each have a spherical cross-section, and accordingly, for example, from a spherically curved body, for. B. formed a ball cut or approximated to such a body. The facets can also be from a body with a different curvature, z. As an aspherical curvature, be formed. In particular, the individual facets can each have a parabolic cross-section, and accordingly be formed as a paraboloid of revolution.

Evidenced the representation of Fig. 1 Each of the facets 22a, 22b, 22c is assigned a focal length 25. This results in an incident beam 60 of parallel light, the z. B. according to Fig. 1 falls on the facet 22b, bundles in a focal point 61. Here all the individual rays of light intersect.

Continuing with the path of the light, the light diverges from the focal point 61 and falls on the lens element 23b on the second lens plate 19. Since the facet 23b is identically arched to the facet 22b of the first lens plate 18, an identical focal length 26 is to be assigned to it. The focal length 25 of the facet 22b of the first lens plate 18 and the focal length 26 of the facet 23b of the second lens plate 19 are thus identical.

Fig. 1 shows a spacing of the two lens plates 18, 19 at a distance 32, which corresponds to twice or approximately twice the focal length 25 (ie at the same time also twice the focal length 26).

The partial light beam 63 emanating from the focal point 61 and striking the facet 23b becomes the facet 23b insofar again collimated, and transformed into a parallel light beam 64.

In addition, it should be noted that the block diagram-like schematic representation in Fig. 1 a linear guide 62 indicates. Accordingly, the first lens plate 18 is fixedly arranged relative to the housing 11, and the second lens plate 19 relative to the first lens plate with the aid of the adjusting device 20 along the linear guide 62 in the axial direction Y displaced.

Evidently the FIGS. 2 and 3 it is clear that on each lens plate 18, 19 a plurality of lens elements 22a, 22b, 22c are arranged, wherein only a part of these facets is provided with reference numerals.

In conjunction with the Fig. 1 shows that in this embodiment, the lens elements 22a, 22b, 22c, 23a, 23b, 23c are arranged on the first and on the second lens plate 18, 19 respectively on the light entrance side 28, 30, and the light exit surface 29, 31 of the respective lens plate 18, 19 is kept flat.

In other embodiments, the respective lens plates 18, 19 may also be oriented differently, so that z. B. the lens elements on the light exit side 29, 31 are arranged, and the respective light entry side 28, 30 is kept free of lens elements. The orientation of the lens elements 22a, 22b, 22c, 23a, 23b, 23c with respect to the light source 12 does not matter according to the invention.

Evidently the FIGS. 2 and 3 It is clear that the lamp 10 may have a substantially circular light exit opening 16, and accordingly, the two lens plates 18, 19 are circular disk-shaped. However, the invention is based on this geometry not limited. The invention also includes lights that have a square or rectangular or another, z. B. polygonal curve train having light exit opening.

From the FIGS. 2 and 3 It is further clear that in the embodiment of the FIGS. 1 to 3 each lamp has three collimator optics 15a, 15b, 15c. However, the number of collimator optics 15, 15a, 15b, 15c is arbitrary. It also depends in particular on the number and design of the LEDs.

Next will be from the FIGS. 2 and 3 clearly that each collimator optics 15 (and thus also each LED 12) is associated with a multiplicity of individual lens elements 22a, 22b, 22c. For example, the illustration of the Fig. 2 in that the collimator optics 15c are associated with more than twenty individual facets 22a, 22b, 22c.

Since each collimator optics 15 or each LED 12 is assigned a plurality of lens elements 22a, 22b, 22c, the structure of the light source 12 can be resolved, and is no longer recognizable to an observer in the room. Similarly, the structures of the LED or the collimator optics in the light distribution on the building wall 17 are no longer recognizable. The light distribution on the building wall is homogeneous.

According to an advantageous embodiment of the invention, the first lens plate 18 and the second lens plate 19 are each formed identically. In particular, in the following description of the embodiments of the FIGS. 4 to 9 Let it now be further assumed that the first lens plate 18 is provided with a plurality of faceted lens elements 22a, 22b, 22c and the second lens plate 19 with a plurality of further faceted lens elements 23a, 23b, 23c, the lens elements 22a, 22b, 22c of the first Lens plate 18 and the lens elements 23a, 23b, 23c of the second lens plate 19 are formed to be identical to each other and positioned identically to each other.

If two identically formed lens plates 18, 19, as in Fig. 4 shown positioned axially spaced from each other, the positioning is such that each lens element of the first lens plate 18, another lens element of the second lens plate 19 is permanently assigned. So is evidently the Fig. 4 the lens element 22b of the first lens plate 18 is always fixedly assigned to the lens element 23b of the second lens plate 19. This fixed assignment remains even after a distance change between the lens plates 18, 19 has been made.

Evidently the FIGS. 4 to 6 can with the aid of the adjusting device 20 in one embodiment of the invention, a change in the distance 32 between a first distance according to Fig. 6 , which corresponds to a minimum distance, and wherein there is almost a contact between the entrance side 30 of the second lens plate 19 and the exit side 29 of the first lens plate 18, or may come, and a second, maximum distance 32 according to Fig. 4 , wherein the two lens plates 18, 19 are spaced approximately twice the focal length 25, 26, are displaced. The displacement can be adjusted by the adjustment z. B. continuously, in particular continuously, take place.

Based on FIGS. 7 to 9 the light distribution generated on the building surface 17 should correspond to the different spacing positions of the two lens plates 18, 19 according to FIGS FIGS. 4 to 6 be explained:

In a distance position according to Fig. 4 in which the distance between the two lens plates 18, 19 corresponds to approximately twice the focal length 25, 26, the emission angle 37 is minimal. It is evidenced by the schematic representation of Fig. 4 0 °, because it is parallel light. Indeed, in view of the big, in Fig. 1 Of course, not shown to scale, actual distance of the building surface 17 of the lamp 10 of the beam angle 37, for example, be about 12 to 16 °. This emission angle already corresponds to the emission angle of the light emitted by the collimator optical system 15.

With the aid of the adjusting device 20, the two lens plates 18, 19 are moved toward each other while reducing the distance 32, and for example an intermediate position according to FIG Fig. 5 achieved with a distance 32, the second lens plate 19 can no longer maximally focus the light received by the first lens plate 18. Fig. 5 illustrates that the lens element 23b, the light beam received by the lens element 22b can collimate only to a lesser extent, and a second radiation angle 38 is provided accordingly. This second emission angle 38 is greater than the first emission angle 37.

While the Fig. 7 shows the light distribution, which comes close to a spot distribution, the light cone is the evidence Fig. 8 - According to the distance position of the lens plates 18, 19 according to Fig. 5 - already expanded. Both the height 52b and the width 51b of the light distribution according to Fig. 8 are opposite to the height 52a and the width 51a of the light distribution according to FIG Fig. 7 considerably larger.

Assuming that the light distribution of the Fig. 7 represents a spot light distribution, represents the light distribution of Fig. 8 already a flood light distribution ready.

Are starting from a distance position according to Fig. 5 the two lens plates 18, 19 further moved toward each other, and a contact or almost a contact position according to Fig. 6 achieved by the second lens plate 19 no or close no bundling of the received light from the first lens plate 18 more. Here, the emission angle 39 is considerably larger than the emission angle 38 in the distance position according to Fig. 5 ,

The light distribution on the wall 17 according to Fig. 9 thus has an even greater height 52c and width 51c compared to the light distribution curve of FIG Fig. 8 ,

Here a wide-flood light distribution is achieved.

By changing the distance between the lens plates 18, 19 and the fixed assignment of the lens elements 22a, 22b, 22c, the first lens plate 18 to the lens elements 23a, 23b, 23c of the second lens plate 19 can insofar a change in the emission characteristics of the lamp 10, in particular a change in the emission angle 37, 38, 39 can be achieved.

Evidently the FIGS. 10 to 13 an embodiment of the invention is explained with an adjusting device 20 which has a manual actuator.

According to the embodiment of the Fig. 10 For example, the luminaire 10 has a first lens plate 18 which, for the sake of simplicity, is shown without lens elements. The lens plate 18 is fixedly arranged relative to the housing 11. The lens plate 19 is adjustable relative to the housing 11 and relative to the first lens plate 18 and in the axial direction along the arrow Y. The lens plate 19 also has lens elements however, they are not shown for the sake of clarity.

The second lens plate 19 is fixedly attached to a ring holder 40. The ring holder 40 comprises an annular body which encloses the second lens plate 19. On the ring body are three sliding blocks 41a, 41b, 41c (see. Fig. 10 . Fig. 11 ) arranged circumferentially offset by approximately 120 ° and project radially outward beyond the edge of the ring holder 40 also.

The ring holder 40 further comprises three positioning means 42a, 42b, 42c, each comprising a positioning web 43a, 43b, 43c. Associated with each positioning web 43a, 43b, 43c on the ring holder 40 is a positioning receptacle 44a, 44b, 44c on the housing 11.

Fig. 10 shows two positioning webs 43a and 43b and the associated Positionieraufnahmen 44a, 44b.

The positioning devices 42a, 42b, 42c ensure a rotational lock between the lamp housing 11 and the ring holder 40. The ring holder 40 is indeed arranged in the direction of the double arrow Y, ie in the axial direction, axially displaceable to the lamp housing 11, but about the central longitudinal axis 65 of the lamp 10th not rotatable to the lamp housing 11th

evidenced Fig. 10 In addition, the adjusting device 20 has an adjusting ring 47.

This encompasses with a collar receiving 46 an outwardly projecting collar 45 of the housing 11. The adjusting ring 47 is so far around the longitudinal center axis 65 of the lamp 10 rotatable, but is in Axial direction Y prevented by the collar 45 at a relative axial movement relative to the lamp housing 11.

On the adjusting ring 47 three slide slots 48a, 48b, 48c are arranged, which serve to receive the sliding blocks 41a, 41b, 41c. The three slide slots 48a, 48b, 48c are, as for example Fig. 11 can be seen, each arranged at 120 ° circumferentially offset, and may for example extend along an angular range of about 75 °.

Evidently the Fig. 13 , An aborted interior view of the adjusting ring 47 in a single view, it is clear that the link slots 48, 48a, 48b, 48c extend helically.

Is based on Fig. 10 the adjusting ring 47 is actuated, that is, rotated relative to the housing 11, thereby the second lens plate 19 from its in solid lines in Fig. 10 shown lower position in their in Fig. 10 displaced in dashed lines shown upper position, that is axially displaced.

As a result, the distance 32 between the first lens plate 18 and the second lens plate 19 is changed.

By the positioning means 42, a, 42b, 42c, the rotational peripheral position of the second lens plate 19 relative to the first lens plate 18 is maintained during the displacement change, even during the adjustment operation. This ensures that the fixed association of a particular lens element 22a, 22b, 22c, on the first lens plate 18 to a particular lens element 23a, 23b, 23c on the second lens plate 19 for different distances 32 is maintained.

A further embodiment of the luminaire according to the invention is based on FIGS. 14 to 19 described.

Evidently the FIGS. 14 and 15 For example, in this embodiment, the lens plate 19 has lenticular lenses each. These are cylindrical lenses along a first cutting plane (see. Fig. 15 ) have spherical or aspherical curvatures, and which are not curved along a second cutting plane perpendicular to the first cutting plane. The lenticular lenses 49a, 49b, 49c are cylindrical in this respect, and are aligned parallel to each other.

Evidently the Figures 16 and 18 In the embodiment of the invention, two identically formed lens plates 18, 19 are positioned relative to each other, so that the two lenticular lens elements 49a, 49b, 49b of the first lens plate 18 and 49a, 49b, 49c of the second lens plate 19 are aligned parallel to each other.

Again, a particular lens element (eg, the lens element 49b) of the first lens plate 18 is assigned a particular lens element (eg, lens element 49e) on the second lens plate 19, and this mapping is again maintained at different distances 32 remains.

The Figures 16 and 18 illustrate different spacing positions of the two lens plates 18, 19th

One recognizes by means of the light distribution of the Figures 17 and 19 in that this lamp is in accordance with FIGS. 24 and 25 also generates at different distances of the two lens plates 18, 19 each have an oval light distribution. As an oval light distribution or illumination intensity distribution on the wall 17 is understood in the usual expert sense, a light distribution, one of a Circular shape of a light distribution, such as according to FIGS. 7, 8 and 9 shown, deviating contour 53 has.

So shows Fig. 17 an oval light distribution 50a with a corresponding oval contour 53a, and a light distribution - in simplified terms - having a width 51a of the light distribution and a height 52a of the light distribution. The light distribution is therefore oval, or approximately elliptical. The exact contour 53a of the light distribution 50a, of course, depends on the radii of curvature used.

As the distance between the two lens plates 18, 19 decreases, the light distribution on the building surface 17 to be illuminated becomes wider. Fig. 19 shows the light distribution 53a on the building surface 17 to be illuminated, the distance position of the two lens plates 18, 19 according to Fig. 18 equivalent. It can be seen that the width 51b of this light distribution 53c is considerably greater than the width 51a of the light distribution 53a of FIG Fig. 17 , This effect results from the fact that the lens elements (listed by way of example) 49d, 49e, 49f respectively no longer receive the partial light bundle received from the lens elements 49a, 49b, 49c of the first lens plate 18 as well or as completely as in the spacing position in FIG Fig. 16 shown, can collimate.

Accordingly, the radiation angle 39c is as in FIG Fig. 18 indicated significantly larger than the beam angle 37 of the Fig. 16 , Here again, it is noted that the emission angle 37 in accordance with Fig. 16 according to the schematic representation actually there is 0 °, because here a parallel light beam is shown. On the other hand, it is clear to the person skilled in the art that in fact a maximum narrow light distribution of, for example, 8 ° in the case of a distance position according to FIG Fig. 16 is reached.

In any case, it is decisive that the light distribution 53c is changed in its width 51b by the change in the distance 32 between the lens plates 18, 19, and thus the emission angle 37, 39 in the sectional plane of FIG Figures 16 and 18 is enlarged.

In a section plane perpendicular to the beam angle is not affected. This explains why the height 52b of the light distribution 53c is practically not different from the height 52a of the light distribution 53a Fig. 17 differs.

Another embodiment of a lamp 10 according to the invention will now be described with reference to the FIGS. 20 to 27 be explained:
Fig. 20 shows in a representation according to Fig. 2 a further embodiment of a lens plate 18, which now has so-called Lentikullarfacetten 54a, 54b, 54c. These are facets that may, for example, have a more complex curvature.

Evidently the FIGS. 20 to 23 It will be understood that facets 54a, 54b, 54c may be arranged along a predetermined pattern. It can be provided in particular that the arrangement of these facets 54a, 54b, 54c according to the illustration of Fig. 20 along a grid that has rows and columns. The number of columns can be dimensioned such that they correspond to the number of lenticullar lenses of a lens plate 18 Fig. 14 equivalent.

Each column of this facet arrangement can be subdivided into a plurality of individual facets.

These lenticular facets may have a particularly domed surface with two different radii of curvature.

evidenced Fig. 21 is a single Lentikullarfacette 54 from the lens plate 18 according to Fig. 20 viewed in enlarged detail. The two sectional views of the FIGS. 22 and 23 make it clear that different radii of curvature can be provided along different, mutually perpendicular sectional planes. It is assumed for the sake of simplicity that all facets 54a, 54b, 54c of the lens plate 18 are identical.

It should also be noted that the facets according to the sectional views of FIGS. 22 and 23 Have radii of curvature, it is clear to those skilled in the art that other curved surfaces, such as elliptical or parabolic curvatures can apply.

The FIGS. 24 and 25 now show a lamp according to the invention, in each case the first lens plate 18 a lens plate 18 according to Fig. 20 and the second lens plate 19 of a lenticullar lens plate according to FIG Fig. 14 provided.

Again are - based on the representation of the previous embodiments - in the FIGS. 24 and 25 two different spacing positions of the two lens plates 18, 19 from each other.

evidenced Fig. 24 a distance position is indicated in which the distance 32 corresponds approximately to twice the focal length 25. Here is a maximum concentration of light instead. Due to the selected bulges of the individual lens elements 54a, 54b, 54c, 54d, 54e, 54f, in turn, an oval light distribution 50c is generated on the building surface to be illuminated. This has an oval light contour 53a, with an assumed light distribution width 51a and an assumed light distribution height 52a.

Height 52a and width 51a may, but not necessarily, the light distribution 50a according to Fig. 17 correspond.

Now, starting from a distance position according to Fig. 24 a distance change brought about by the adjusting device 20, and the two lens plates 18, 19 to each other up to a contact position according to Fig. 15 Approximately, the lens elements 54d, 54e, 54f can no longer collimate or no longer focus the light received from the respective lens elements 54a, 54b, 54c on the first lens plate 18. The light distribution is wider so far, resulting in a larger beam angle 39 with respect to the radiation angle of the Fig. 24 results. It is assumed that - as from Fig. 27 can be seen - now the height 52b of the light distribution 50d according to Fig. 27 is considerably larger than the height 52a of the light distribution 50c of Fig. 26 , However, this consideration is based on the fact that the sectional planes of the FIGS. 24 and 25 now in a plane perpendicular to the cutting planes of the Figures 16 and 18 to be viewed as. Otherwise, the height 52b would not increase in proportion to the height 52a of the light distribution 50c, but again the width.

Looking at the FIGS. 26 and 27 Further, it is clear that the light distributions 50c and 50d have a constant width 51a, 51b. This width is given by the radiation angle, the corresponding other curvature (ie the in Fig. 25 Curvature not shown) corresponds to the corresponding Lentikullarfacetten 54.

The FIGS. 22 and 23 yes show both curvatures along different cutting planes, where it was assumed that Fig. 25 only the cutting plane according to the Fig. 23 shows.

The by the curvature according to Fig. 22 produced beam angle, so also a spread of the received from the first lens plate 18 parallel light beam, provides in the embodiment of FIGS. 24 to 27 for the predetermined width 51a, 51b of the corresponding light distribution 50c, 50d and is not changeable in this embodiment.

According to the embodiments of the drawings, on each of a lens plate 18, 19, the plurality of facets 22a, 22b, 22c, 23a, 23b, 23c, 49a, 49b, 49c, 49d, 49e, 49f, 54a, 54b, 54c, 54d, 54e , 54f identically formed. The invention also includes, however, if different facets, for example different types of facets, are arranged on a lens plate 18, 19.

Of the invention is further encompassed when on a lens plate completely different facets, eg. B. with the aid of simulations calculated free-form body are arranged.

In the embodiments of the invention, a change in distance of the two lens plates 18, 19 from each other by means of an axial movement, wherein the two lens plates are aligned parallel to each other in each distance position. The invention also encompasses a displacement movement by means of the adjusting device 20 instead of such a change in distance between the lens plates 18, 19 in such a way that, in addition to an axially directed, parallel displacement movement or alternatively to such movement, a change in distance between the lens plates 18, 19 takes place relative to one another in that one of the two lens plates 18, 19 is tilted or inclined relative to the respective other lens plate 19, 18, or is subjected to another, possibly more complicated movement. Again, it can be ensured that an assignment of a respective lens element of a lens plate to another lens element of another lens plate is firmly retained.

However, the invention also encompasses exemplary embodiments in which this assignment is canceled in the course of a change in distance, and different lens elements of the first lens plate are assigned to different lens elements of the second lens plate, for example, in discrete, different distance positions.

Finally, only exemplary embodiments are shown in the drawings, in which the rotational position of the second lens plate 19 is maintained during a change in distance relative to the first lens plate 18. However, the invention also encompasses embodiments in which a change in the rotational position of the second lens plate 19 relative to the first lens plate 18 occurs as a result of a change in distance between the lens plates 18, 19.

The invention comprises at least two lens plates 18, 19 which can be changed in relation to each other at a distance from one another. The invention also encompasses luminaires in which one or more additional lens plates are provided.

The method for changing the radiation characteristic of a luminaire can be carried out as follows:
Suppose a work of art of a particular format is illuminated in a museum by means of a luminaire according to the invention during the duration of a temporary exhibition. Upon completion of this exhibition, a new artwork with a different format will be illuminated by the same luminaire on the same or another building surface. To the light distribution of the lamp to adapt to this format change of the artwork, a change in distance of the two lens plates 18, 19 to each other by the adjusting device 20 by an operator in the desired manner can be made.

The change in the light distribution or radiation characteristics of the lamp is feasible without that certain elements of the lamp must be replaced or replaced, or even the light head of the lamp should be replaced or replaced.

In the embodiments of the invention, an axial displacement of the second lens plate 19 relative to the first plate 18 by means of a Verstellwegs, which is approximately twice the focal length 25 of the lens elements 22a, 22b, 22c of the first lens plate 18. The invention also encompasses embodiments in which the displacement provided by the adjusting device 20 for the change in the distance 32 between the lens plates 18, 19 is, in contrast, slightly or significantly greater or less or significantly smaller.

In the event that the lens elements 22a, 22b, 22c of the first lens plate 18 provide different focal lengths 25, the travel path to be provided on the adjusting device 20 may be based on the focal length or the double focal length 25 of one of the facets 22a, 22b, 22c.

Advantageously, the travel path to be provided by the adjusting device 20 is dimensioned such that a change in distance between the lens plates 18, 19 is provided between a first optimized distance, in which a minimum radiation angle, ie light directed almost in parallel, is generated, and a second one Distance position, which generates a maximum radiation angle, given by the curvature of the lens elements.

These two different spacing positions between the lens elements 18, 19, which respectively provide a maximum beam angle and a minimum beam angle, may also be predetermined or predetermined by stops provided by the actuator 20, and correspondingly a displacement movement of the second lens plate 19 relative to the first one Limit lens plate 18.

In the event that the change in distance between the lens plates 18, 19 is to take place in discrete steps, in order to ensure predetermined spacing between the lens plates 18, 19 (for example, to allow certain optimized, eg very homogeneous light distributions), can along The travel also be set rest positions, ie positions in which the distance position between the two lens plates 18, 19 are detected by an operator or by an electronic or mechanical sensor or a control unit, or can be determined. As a result, it can be ruled out, for example, that certain intermediate positions between predetermined locking positions are not achieved.

In accordance with embodiments of the invention, conventional LEDs 12, 12a, 12b, 12c, and conventional collimator optics 15, 15a, 15b, 15c may be used. In this case, lens elements 22a, 22b, 22c, 23a, 23b, 23c find application, which are aspherical, but can be approximately described by a sphere, wherein the sphere z. B. may have a curvature diameter between 1 and 50 mm.

As typical to be provided by the adjustment 20 adjustment paths along which a change in distance between the two lens plates 18, 19 can be made, for example, adjustment paths between 2 and 40 mm are provided, preferably adjustment paths in the order of about 4 to 6 mm.

In order to prevent a dissolution of the structures of the LED 12 and of the collimator optics 15 in order to generate the most homogeneous illumination intensity distribution or light distribution on the building surface 17, per collimator optics 15, 15a, 15b, 15c and / or per LED 12, 12a, 12b, 12c and / or LED group - z. B. in the case of using a multi-chip LED - about 10 to 50 lens elements 22 a, 22 b, 22 c provided on the lens plate 18. In this way, a particularly optimized homogenization of the light incident on the two lens plates 18, 19 or emitted by the lens plates 18, 19 can take place.

As shown in the exemplary embodiments, the collimator optics 15 has a cavity 57, total reflection surfaces 58 and a ceiling region 59, ie central to the collimator optics 15, a conventional lens. Also, other suitable collimator optics that focus the light emitted from the corresponding light source are included in the invention.

According to the invention can be used to provide a lamp 10 according to the invention on conventional lens plates 18, 19, the applicant for some time z. B. as tertiary optics in lighting application. In this case, it is also possible, by arranging a second additional lens plate on a lamp which already has a lens plate to retrofit the luminaire as part of a retrofit kit, and equip it with an adjusting device 20 for changing the light characteristic.

As evidenced by the embodiment of Fig. 28 will be briefly referred to another embodiment, in its illustration according to Fig. 28 the representation of Fig. 1 equivalent. Here is a bundling optics 66 is provided, the bundling optics 66 of Fig. 1 replaced. In the embodiment of the Fig. 28 is provided as a bundling optics 66, a reflector 68 which cooperates with an arrangement of a chip on board LED 67 which is disposed within the reflector 68, or a reflector 68 is associated. The reflector 68 also emits, together with the chip on board LED 67, a light beam 27 of parallel or approximately parallel light.

The arrangement of the two lens plates 18, 19 can in the embodiment of the Fig. 28 be taken equally as in the embodiment of Fig. 1 , The light distribution of the lamp 10 corresponds to the different light distributions at different distances 32, resulting from the FIGS. 4 to 9 result.

A further embodiment of a luminaire 10 according to the invention Fig. 29 provides a bundling optics 66, which has a collimator optics 15d with lens elements 70a, 70b, 70c arranged directly thereon. The lens elements 70a, 70b, 70c are thus arranged on the light exit side 56 of the collimator optics 15d, which, unlike the embodiment of FIG Fig. 1 - Is not held smooth, but the plurality of lens elements 70a, 70b, 70c has.

Using an exemplary light beam 71, the Fig. 29 be taken that the light emission of this lamp that of the embodiment of Fig. 1 equivalent.

The second lens plate 19b of the embodiment of Fig. 29 corresponds to the second lens plate 19 of the embodiment of Fig. 1 , The fact that here the lens elements 23a, 23b, 23c are arranged on the light exit side 31 of the second lens plate 19b, and the light entrance side 30 is kept flat, is irrelevant. The orientation of the second lens plate 19b could be in the embodiment of the Fig. 29 also be met the other way around.

At different distances of the lens plate 19b to the collimator optics 15d of the embodiment of Fig. 29 arise exactly the same changes in the radiation characteristics of the lamp, as in the Fig. 4 to 9 on the embodiment of Fig. 1 shown.

Again, it is clear that the lens plate 19b may also cover a plurality of corresponding collimator optics 15d.

As evidenced by the embodiment of Fig. 30 be another lens plate 18 presented. The presentation of the Fig. 30 corresponds to the representation of the Fig. 2 ,

Instead of facet-like lens elements 22a, 22b, 22c according to the embodiments of the FIGS. 2 to 3 and instead of lenticular lens elements 49a, 49b, 49c according to the embodiment of FIG Fig. 14 Here, annular, concentrically arranged lenticular lens elements 69a, 69b, 69c are provided.

In an embodiment of a luminaire according to the invention, not shown, two lens plates 18, 19 are used, as in Fig. 30 are shown. For example, this results in the same cross-sectional representation as in Fig. 1 schematically not indicated to scale.

If the two lens plates 18, 19 according to Fig. 30 arranged with different distances, resulting in accordance with the FIGS. 4 to 9 to the embodiment of the Fig. 1 identical light distributions. The advantage of an arrangement of two lens plates 18, 19 according to Fig. 30 in a lamp according to FIGS. 4 to 6 is that with a displacement of the second lens plate member 19 relative to the first lens plate member 18, this relative circumferential position does not need to be maintained, but that this may change due to the rotational symmetry of this element 18, 19 in an axial displacement movement, without affecting the light distribution ,

According to a further non-illustrated embodiment of the invention, one or more of the lens plates 18, 19, 19b, differently, as shown in the different embodiments of the patent application, curved or curved formed.

Alternatively, as shown in the drawings, the lens plates 18, 19 may be aligned along a plane.

As evidenced by the embodiment of Fig. 31 For example, the lens elements may also be arranged facing away from one another such that the lens elements 22a, 22b, 22c of the first lens plate 18 face the collimator optics 15 and the lens elements 23a, 23b, 23b of the second lens plate 19 are arranged on the side of the second lens plate 19 the collimator optics 15 is turned away.

The embodiment of Fig. 32 finally takes up the basic structure of the embodiment of Fig. 31 on: Here are however, in contrast to the embodiment of the Fig. 31 , the lens elements 22a, 22b, 22c of the first lens plate 18 are provided with a first radius, so that the corresponding one Lens elements 22a, 22b, 22c, a first focal length 25 can be assigned.

In contrast, the lens elements 23a, 23b, 23c of the second lens plate 19 have a smaller radius, so that each lens element 23a, 23b, 23c of the second lens plate 19 can be assigned a focal length 26 which is smaller than the focal length 25. This is a special one advantageous embodiment.

The feature group according to which the lens elements 22a, 22b, 22c of the first lens plate 18 all, or in the majority, or at least in the middle, a larger radius and / or a greater focal length than the lens elements 23a, 23b, 23c of the second lens plate 19, can be used advantageously according to the invention in all embodiments.

The advantage of this particular geometry is, inter alia, that the light beam emitted by a specific lens element (eg 22b) of the first lens plate 18 actually hits on a corresponding opposite lens element 23 of the second lens plate 19 with great certainty.

It should be noted that the differences in the focal lengths or the differences in average or average focal lengths between the lens elements 22a, 22b, 22c of the first lens plate 18 and the lens elements 23a, 23b, 23c of the second lens plate 19 may be several millimeters. For example, the focal length of the lens elements 22a, 22b, 22c of the first lens plate 18 may be between 3 mm and 10 mm, and the focal length 26 of the lens elements 23a, 23b, 23c of the second lens plate 19 may be between 0.5 mm and 2.9 mm ,

As evidenced by the embodiment of Fig. 3 will now be explained schematically that a single lens element, for. For example, the lens element 23e may not necessarily be formed by a sphere but also by a paraboloid of revolution. However, the cap portion 72 of each rotational parabolic lens element 23e may be approximately described by a circular shape 73. This circular shape 73 can be assigned a radius R.

The inside of this cap portion 22 entering light rays (see Fig. 33 ) are focused in the cap area - for example - on a common focal point 61 out.

In fact, as a result of the deviation of the cap shape 72 or the contour of the paraboloid of revolution from a sphere, the situation may arise that no exact focal point 61 results, but rather a focal point region. However, even such a focal point range can be assigned a mean focal length f _M. This representation takes into account that an averaged focal length f _{M can be} calculated or determined when considering all the rays passing through the cap region 72 or through the paraboloid of revolution of this lens element 23e.

With reference to the embodiment of the Fig. 34 It should be noted that the focal length 25 of the lens elements 22a, 22b, 22c of the first lens plate 18 may also be an averaged focal length 25. In further, not illustrated in the drawings embodiments, which are encompassed by the invention, it may be provided that the average focal length 25 of the lens elements 22a, 22b, 22c of the first lens plate 18 is greater than the average focal length 26 of the lens elements 23a, 23b, 23c of the second lens plate 19.

In other embodiments, not shown in the figures, however, it is provided that the average focal length 25 of the lens elements 22a, 22b, 22c of the first lens plate 18 is smaller than the average focal length 26 of the lens elements 23a, 23b, 23c of the second lens plate19.

Fig. 34 shows finally - in accordance with and in accordance with the embodiment of Fig. 32 - Another embodiment in which all the lens elements 22a, 22b, 22c, 23a, 23b, 23c are arranged on the two lens plates 18, 19 respectively on the side of that lens plate 18, 19, which faces away from the collimator lens 15.

Claims (16)

Luminaire (10) for illuminating building surfaces (17) or building part surfaces, comprising a housing (11), at least one light source, in particular an LED (12, 12a, 12b, 12c), and at least one bundling optics, in particular collimator optics (15, 15a, 15b, 15c) for focusing the light emitted by the light source, characterized in that in the light path behind the bundling optics at least two lens plates (18, 19) are provided, on each of which a plurality of lens elements (22a, 22b, 22c, 23a, 23b , 23c, 69a, 69b, 69c, 70a, 70b, 70c), in particular grouped, wherein the distance (32) between the two lens plates by means of an adjusting device (20) is changeable, and wherein the lamp in different pitch positions of the lens plates provides different light distributions (37, 38, 39, 50a, 50b, 50c). Luminaire according to claim 1, characterized in that the adjusting device (20) for changing the distance (32) comprises a motor, in particular electromotive drive. Luminaire according to claim 1 or 2, characterized in that the adjusting device (20) to change the distance (32) comprises a manually operable adjusting element (47). Luminaire according to one of the preceding claims, characterized in that the adjusting device (20) is associated with a positioning device (42a, 42b, 42c) which, when a change in distance between the two lens plates (18, 19) for maintaining the relative rotational position between the ensures both lens plates. Luminaire according to one of the preceding claims, characterized in that the different light distributions different emission angles (37, 38, 39) of the lamp. Luminaire according to one of the preceding claims, characterized in that the light in different distances positions of the lens plates (18, 19) different beam angles (37, 38, 39), in particular correspondingly about light distributions between spot and Wideflood provides. Luminaire according to one of the preceding claims, characterized in that the distance (32) between the lens plates (18, 19) is continuously changeable. Luminaire according to one of the preceding claims, characterized in that one of the two lens plates (18) fixed relative to the housing (11) is arranged and the other lens plate (19) by means of the adjusting device (20) relative to the housing (11) is displaceable , Luminaire according to one of the preceding claims, characterized in that the lens elements (22a, 22b, 22c, 23a, 23b, 23c) on at least one of the lens plates (18, 19), preferably on both lens plates, facets, in particular curved facets comprise. Luminaire according to claim 9, characterized in that several or all facets (22a, 22b, 22c, 23a, 23b, 23c) each have a curvature which is spherical or approximated to a sphere, and is provided, for example, by a paraboloid of revolution. Luminaire according to one of the preceding claims, characterized in that in each case one lens element (22b) of a lens plate (18) is associated with a lens element (23b) of the other lens plate (19). Luminaire according to claim 11, characterized in that the assignment is made such that light components which, starting from the focusing optics (15), strike a lens element (22b) of the first lens plate (18), only from this lens element (23b) directed towards the second lens plate (19). Luminaire according to claim 11 or 12, characterized in that the association with a change of the distance (32) between the lens plates (18, 19) is maintained. Luminaire according to one of the preceding claims, characterized in that the lens elements on at least one of the lens plates (18, 19) comprise lenticular lenses (49a, 49b, 49c). Method for changing a light emission characteristic of a luminaire (10) for illuminating building surfaces (17) or building part surfaces, in particular a luminaire according to one of claims 1 to 14, comprising the following steps: a) providing a luminaire (10), comprising a housing (11), at least one light source (12), at least one bundling optics, in particular a collimator optics (15), and at least two lens plates (18, 19) provided in the light path behind the bundling optics, each having a plurality of lens elements (22a, 22b, 22c, 23a, 23b, 23c), b) providing an adjusting device (20) with which the relative position of one of the two lens plates (19) relative to the other lens plate (18) is changeable, c) changing the radiation characteristic (37, 38, 39) of the luminaire (10) by displacing the one lens plate (19) relative to the other lens plate (20). Luminaire (10) for illuminating building surfaces (17) or building part surfaces, comprising a housing (11), at least one light source, in particular LED (12, 12a, 12b, 12c) and at least one collimator optics (15d) for focusing the light emitted by the light source Light, characterized in that on the collimator optics (15d) a plurality of lens elements (70a, 70b, 70c) is arranged, and that in the light path behind the lens elements at least one lens plate (19b) is provided, on each of which a plurality of lens elements ( 23a, 23b, 23c) is arranged, wherein the distance (32) between the lens plate (19b) and the collimator optics (15d) by means of an adjusting device (20) is changeable, and wherein the lamp (10) in different spaced positions of the lens plate (19d ) provides different light distributions from the collimator optics (15d).

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