WO2006087126A1

WO2006087126A1 - Spotlight with a variable light-emitting characteristic

Info

Publication number: WO2006087126A1
Application number: PCT/EP2006/001101
Authority: WO
Inventors: Günther SEJKORA
Original assignee: Zumtobel Lighting Gmbh
Priority date: 2005-02-17
Filing date: 2006-02-08
Publication date: 2006-08-24
Also published as: DE102005007348A1; ATE474186T1; EP1848922A1; DE502006007420D1; EP1848922B1

Abstract

The invention relates to a spotlight (40) comprising a holder (13) for a light source (14), and a reflector (41) which at least partially surrounds the holder (13) and forms a light outlet (42) and is used to focus the light emitted by the light source (14). The arrangement of the holder (13) in relation to the reflector (41) can be varied in the light-emitting direction. The reflector (41) is split into a head reflector (5) surrounding the holder (13) and a main reflector (11) which is connected to the head reflector (5) in the light-emitting direction and forms the light emitting opening (42). The holder (13) can be displaced in relation to the two reflector parts (5, 11), and the arrangement of the two reflector parts (5, 11) in relation to each other can vary in the light-emitting direction.

Description

Spotlight with variable light emission characteristic

The present invention relates to a spotlight according to the preamble of claim 1, which has a lamp holder for a light source and a light source at least partially surrounding the reflector for bundling the light emitted from the light source, wherein for changing the Lichtabstrahlcharakteristik the light, the distance between the reflector and the lamp holder for the light source in the light emission direction is changeable. Furthermore, the present invention relates to a so-called varioreflector for bundling the light emitted by a light source.

It is known to equip spotlights or spotlights with so-called varioreflectors. These are reflectors in which the bundle width of the light emitted by a light source can be changed by mechanical adjustment. It is known in this context that the lamp is moved axially - ie in the light emission direction - relative to the reflector. By thus obtained displacement of the light source relative to the focal point of the reflector, the light emitted from the light source via the reflector light can be changed from an approximately parallel beam into a cone of light with a relatively wide opening angle. Of course, this effect can also be achieved by not adjusting the light source but instead the reflector with respect to the light source.

A spotlight, in which such a focus adjustment of the light source with respect to a reflector is possible, is bpsw. known from EP 0 521 267 A1. By a certain adjustment mechanism, the socket carrier for the light source can be moved in a simple manner in the axial direction, so that the light emission characteristic of the radiator is influenced in the desired manner.

However, a problem with the previously known varioreflectors is that the available range, via which an adjustment of the light source is possible, is only very small. The reason for this is that the bundle of rays emitted by the light source via the reflector fans out very quickly into a ring if the light source is displaced too strongly with respect to the focus of the reflector. In this case, a dark zone is created in the middle of the beam, so no homogeneous light emission is more present. However, such a fanning out into a light ring generally does not meet the lighting requirements for the illumination of a room or an object.

Furthermore, from DE 40 16 531 Al a luminaire is known in which the reflector is divided into two areas. A head portion of the reflector is in this case fixedly arranged with respect to the light source and can be moved together with the light source relative to the further reflector part. Even with this known lamp, however, the above-described problem of fanning the light is only partially avoided.

The present invention is accordingly an object of the invention to provide a spotlight with an adjustable Lichtabstrahlcharakteristik in which the above-mentioned disadvantages are avoided and which in particular in the largest possible adjustment range has a homogeneous Lichtabstrahlcharakteristik in the form of a single beam.

The object is achieved by the invention specified in the independent claims. Advantageous developments of the invention are the subject of the dependent claims.

The core idea of the present invention is accordingly to divide the reflector surrounding the light source into two areas, namely a head reflector surrounding the light source and a main reflector adjoining the head reflector in the light emission direction and forming the light exit opening, whereby the light source can be adjusted relative to the two reflector parts on the other hand, the arrangement of the two reflector parts to one another in the light emission direction is variable.

According to a first aspect of the present invention, a spotlight is accordingly proposed, which has a socket for a light source and a socket at least partially surrounding and a light exit opening forming reflector for bundling the light emitted from the light source, the arrangement of the light source with respect to the reflector in Lichtabstrahlrichtung is changeable. According to the invention, the reflector is subdivided into a head reflector surrounding the light source as well as a main reflector adjoining the head reflector in the light emission direction and forming the light emission opening, on the one hand the socket opposite the two reflector parts adjustable and on the other hand, the arrangement of the two reflector parts seen each other in the light emitting direction is changeable.

The inventive subdivision of the reflector and provided in the axial direction adjustability of the two reflector parts to each other opens up the possibility of existing in the prior art disadvantage of fanning the

To avoid radiation beam. Namely, if the light source in the luminaire according to the invention relative to the focus of the main reflector shifted too much, this effect can be compensated by a corresponding adjustment of the arrangement of the head reflector again. Ultimately, the light rays are in this way in turn combined into a single beam.

Accordingly, the effect according to the invention is based on the fact that of the three luminaire components light source or socket for the light source, head reflector and main reflector, at least two of them - in the light emission direction - are adjustable, relative to one another and to the third element. This does not necessarily have to be the light source or the socket and the head reflector, it would of course also conceivable that the light source is fixed in a certain position and instead a corresponding adjustment of the two reflector parts is performed. According to a preferred embodiment of the present invention, however, it is provided that the main reflector is fixed and the socket for the light source and the head reflector are designed to be adjustable, since in this case the outer dimensions of the lamp remain unchanged regardless of the set Lichtabstrahlcharakteristik.

Since in an adjustment of the light source relative to the main reflector, the position of the head reflector must always be adjusted in a certain way to achieve a uniform beam, is also provided according to an advantageous embodiment of the present invention that the movements of both adjustable elements are coupled. Preferably, accordingly, an adjusting device is provided, at the same time both adjustable elements of the luminaire are displaced in a suitable manner, so that in principle the desired bundling of the light beams takes place. As a result, a particularly simple adjustment of the light emission characteristic is made possible because the positions of the various elements do not have to be adjusted to one another in order to achieve a homogeneous light emission. The adjusting device may for example have a rotatable adjusting element, which is coupled for example with the socket and the movable reflector part in a suitable manner. This Adjustment can be formed for example by an eccentric or by a rotatable link ring. It is essential here that the two adjustable elements are not fixed to one another, as is the case with the luminaire according to DE 40 16 531 A1. Instead, even in the coupled movement according to the preferred embodiment, both elements perform different movements, ie, they are also displaced relative to each other.

According to a second aspect of the present invention, there is further proposed a reflector for bundling the light emitted from a light source to be located within the reflector, the reflector being in a head reflector surrounding the socket for the light source and in the light radiating towards the head reflector forming the light radiating aperture Main reflector is divided and wherein on the one hand, the version relative to the two reflector parts adjustable and on the other hand, the arrangement of the two reflector parts to one another in the light emission direction is changeable.

The shape of the reflector can basically be adapted to the shape of the light source, in the case of an approximately punctiform light source, the reflector is preferably designed rotationally symmetric, in which case the head reflector has the shape of a slightly curved shell and the main reflector is formed by a reflector ring.

The invention will be explained in more detail with reference to the accompanying drawings. Show it:

Fig. 1 shows schematically the embodiment of a radiator lamp according to the invention;

2a to 2c, a first embodiment of an adjusting device for the coupled adjustment of the light source and the head reflector;

3a to 3c, a second embodiment of an adjusting device for changing the Lichtabstrahlcharakteristik and

4a to 4c Lichtabstrahldiagramme, which illustrate the effect of the lamp according to the invention.

In Fig. 1, only those elements of the generally designated by the reference numeral 40 emitter light are shown, which are required to achieve the inventive effect of adjusting the Lichtabstrahlcharakteristik. Accordingly, the spotlight 40 has a held in a socket 13 light source 14, which is surrounded by a cup-shaped reflector 41 having a light exit opening 42 on its underside. The Lichtabstrahlcharakteristik the light 40 is given primarily by the shape of the reflector 41 and by the arrangement of the light source 14 within the reflector 41.

In previously known varioreflectors was provided to adjust the light emission characteristic by changing the position of the light source within the reflector. By shifting the light source relative to the focal point of the reflector, the light beams were fanned out so that the width of the emitted beam could be adjusted at least to a certain extent.

This displaceability of the light source 14 relative to the reflector 41 is also provided in the spotlight 40 according to the invention, which is schematically represented by the first double arrow I. However, since an excessively wide displacement of the light source 14 relative to the focal point of the reflector 41 would lead to a ring-like fanning of the light beams, it is now provided according to the invention that the reflector 41 is subdivided into two parts, namely a head reflector 5 and in the light emission direction at the Head reflector 5 subsequent main reflector 11. Another feature of the lamp 40 according to the invention is that the arrangement of the head reflector 5 to the main reflector 11 is also changeable, which is illustrated by the second double arrow II. So now if the light source 14 is moved relative to the main reflector 11, it can be ensured by a suitable adjustment of the position of the head reflector 5, that even in the event that the light source 14 is significantly shifted from the focal point of the annular main reflector 11, despite all single beam is emitted through the light exit opening 42. The range over which a change in the light emission characteristic of the emitter lamp 40 according to the invention is made possible is thereby significantly greater than in previously known emitters.

The arrangement of the head reflector 5 with respect to the light source 14 and the main reflector 11 must always be done in a certain way in order to achieve the desired bundling of the light beams. Preferably, therefore, it is provided that the light source 14 and the socket 13 and the head reflector 5 are not freely adjustable, but instead that a coupling of the displacement paths of the light source 14 and the head reflector 5 is present. A first embodiment of a suitable adjustment, with the help of an adjustment of the socket 13 with a simultaneous adjustment of the head reflector 5 is coupled, will be explained below with reference to FIGS. 2a to 2c.

In this first embodiment, two guide discs Ia and Ib with the (not shown) luminaire housing of the spotlight according to the invention

40 firmly connected. Between the two discs 1a and 1b there is a cage 2, which by means of a longitudinal axis 3a and a hollow axis 3b in two in the guide discs

Ia and Ib provided guide holes 4a and 4b is performed. At the end of in

Light emission direction facing hollow axis 3b of the head reflector 5 is fixed, which is configured rotationally symmetrical.

Within the cage 2 there is an eccentric disc 6, which is freely rotatable about an axis 7, which is at right angles to the Lichtabstrahlrichtung or to the axis 3a and the hollow shaft 3b and is connected to the lamp housing by an angular range of up to 180 ° , A arranged between the underside of the upper guide disc Ia and the top of the cage 2 spring 8 presses an extension of the axis 3a standing first stylus 9 to the upper edge of the eccentric disc 6, which forms a first trajectory 17a.

As shown in FIGS. 2a to 2c, the distance of the tip of the first stylus 9 acting as a guide part from the axis of rotation 7 of the eccentric disc 6 and accordingly also the position of the camshaft 6 changes as shown by the reference numerals 10a to 10c by turning the eccentric disc 6 Cage 2 and of the hollow axis 3b rigidly connected to the cage 2 Kopfreflektors 5 relative to the fixed to the lamp housing main reflector 11. By turning the eccentric disk 6 clockwise thus the head reflector 5 can be pushed in the light emitting direction and thus in the main reflector 11. The upper edge IIa of the main reflector 11 is dimensioned such that in principle there is an overlap between the two reflector parts 5, 11 in order to avoid unwanted lateral light emission.

Within the arranged on the underside of the cage 2 hollow shaft 3b is also a further axially displaceable axis 12, at the end of the lamp holder 13 is mounted with the lamp 14. At the other end of this axis 12 is another stylus 15, which is pressed by means of a second spring 16 which abuts between a shoulder surface of the hollow axis 3b and a shoulder surface of the axis 12, against the underside of the eccentric disc 6, which a second trajectory 17b forms. Accordingly, by turning the eccentric disk 6, the distance between the stylus 15 and the axis 7, and thus the position of the lamp 14 with respect to the main reflector 11, changes as indicated by the reference numerals 18a to 18c.

Upon rotation of the eccentric 6 so that not only the position of the head reflector 5 but also the position of the light source 14 is changed. Depending on the design of the two trajectories 17a and 17b of the eccentric disc 6 so that the positions of the head reflector 5 and the lamp 14 with respect to the main reflector 11 as desired - but matched to each other - be changed. It is important that the arrangement of lamp 14 and head reflector 5 to each other changes. Accordingly, the trajectories will be chosen such that upon an adjustment of the light source 14, a suitable adaptation of the position of the head reflector 5 automatically takes place, so that a uniform beam is emitted.

A second embodiment of a suitable adjusting device for changing the position of the light source and the reflector part is shown in Figs. 3a to 3c. Fig. 3a shows the adjusting device in the lateral cross-section, while Fig. 3b shows the adjusting device in plan view. Fig. 3c again shows the side view of a rotary or sliding ring, which comes in this second embodiment of the adjusting device used.

In this second variant, two guide disks 20a and 20b are fixedly connected to the luminaire housing of the luminaire 40 according to the invention. Both guide discs 20a and 20b are further connected by a cylindrical guide body 21, which is arranged axially to the light emission direction of the radiator and has two recesses 22a and 22b parallel to its axis. In both recesses 22a and 22b, two slides 23 and 24 are arranged, which can slide vertically or in the light emitting direction. The first slider 23 is connected at its lower end with a support ring 25 to which the head reflector 5 is attached. The second slider 24 in turn is connected to a socket carrier 26, at the lower end of the lamp holder 13 and the light source 14 are arranged. Both slides 23 and 24 are axially displaceable by means of pins 27 and 28 respectively.

The adjustment of the two slides 23 and 24 and thus the light source 14 and the head reflector 5 via a rotary or sliding ring 29 which is arranged annularly around the guide body 21 and the two slides 23 and 24 and rotated about its axis parallel to the light emission axis can be. Laterally in the rotary ring 29 two guideways or trajectories 30a and 30b are milled, in which engage the two pins 27 and 28 of the slide 23 and 24. Accordingly, when the rotary ring 29 is rotated about its axis, the two pins 27 and 28 slide along the trajectories 30a and 30b, thereby shifting the position of the head reflector 5 and the lamp 14 with respect to the main reflector. Again, depending on the design of the two trajectories 30a and 30b of the rotary ring 29, the positions of the head reflector 5 and the lamp 14 relative to the main reflector 11 can be changed as desired - but coordinated with each other.

The effect of the adjusting device according to the invention for the spotlight is shown in FIGS. 4a to 4c. Fig. 4a shows the first

Light emission characteristic for a spotlight, wherein the light source is disposed within the focal point of the reflector. As can be seen from the illustration, a very narrow beam is generated in this case, since the light beams are emitted in a very narrow angular range or nearly parallel.

A shift of the light source relative to the focal point of the reflector results in an extension of the beam. If, however, a one-part reflector is used, as is known from the prior art, then the light emission characteristic shown in FIG. 4b results for a strong displacement. The light emission characteristic is shown in the case where the lamp has been displaced 8mm from the focus of the reflector. As can be seen from the illustration, a uniform beam is no longer obtained in this case, instead, the light beams focus in an annular area, so that a dark spot is generated in the central region, which is undesirable from a lighting technical point of view.

Fig. 4c, however, shows the light emission characteristic when using a two-part reflector according to the invention, wherein now the lamp has been moved by 15mm and the head reflector for adjustment by about 10.5mm in the light emitting direction. As can be seen from the illustration, despite the relatively strong displacement of the light source, a single beam is still generated, which is due to the adaptation of the position of the head reflector.

Overall, the present invention thus opens up the possibility of changing the light emission characteristic of a radiator in a wide range, wherein, in spite of all, the light is still emitted in the form of a uniform light bundle. It should be noted in this context that in the in Figs. 2a to 2c and 3a to 3c illustrated embodiments was basically assumed that the main reflector 11 is fixedly disposed within the lamp housing. This is quite advantageous since, in this case, regardless of the setting of the light emission characteristic, the overall appearance of the luminaire does not change. Of course, the adaptation according to the invention could of course also be achieved by arranging the light source or the head reflector in a fixed position and instead adjusting the two further components of the luminaire.

Claims

claims

1. spotlight (40) having a socket (13) for a light source (14) and a socket (13) at least partially surrounding and a light exit opening (42) forming the reflector (41) for bundling the light emitted from the light source (14) , wherein the arrangement of the socket (13) with respect to the reflector (41) in the light emission direction is variable, characterized in that the reflector (41) in a socket (13) surrounding the head reflector (5) and in the light emission direction of the head reflector ( 5) subsequent, and the Lichtabstrahlöffnung (42) forming the main reflector (11) is divided, on the one hand, the socket (13) relative to the two reflector parts (5, 11) adjustable and on the other hand, the arrangement of the two reflector parts (5, 11) to each other in the light emitting direction is changeable.

2. Spotlight according to claim 1, characterized in that an adjustment of the socket (13) with a simultaneous adjustment of one of the two reflector parts (5, 11) is coupled.

3. spotlight according to claim 2, characterized by an adjusting device for simultaneously adjusting the socket (13) and the movable reflector part (5, 11).

4. spotlight according to claim 3, characterized in that the adjusting device comprises a rotatable adjusting element (6, 29) which is coupled to the socket (13) and the movable reflector part (5, 11).

5. spotlight according to claim 4, characterized in that the adjusting element is formed by an eccentric disk (6) which has track curves (17a, 17b) for guide parts (9, 15) connected to the socket (13) and to the movable reflector part (5, 11).

6. spotlight according to claim 5, characterized in that the eccentric disc (6) about an axis perpendicular to the Lichtabstrahlrichtung axis (7) is rotatable.

7. spotlight according to claim 4, characterized in that the adjusting element by a rotary ring (29) is formed, which has two recesses formed as guideways (30 a, 30 b) which with with the socket (13) and the movable reflector part (5, 11) associated guide pins (27, 28) cooperate.

8. spotlight according to claim 7, characterized in that the rotary ring (29) is rotatable about an axis arranged parallel to the Lichtabstrahlrichtung axis.

9. spotlight according to one of the preceding claims, characterized in that the main reflector (11) fixedly disposed within a lamp housing and is firmly connected to a lamp housing.

10. spotlight according to one of the preceding claims, characterized in that the head reflector (5) designed shell-shaped and the main reflector (11) is formed by a reflector ring.

11. Spotlight according to one of the preceding claims, characterized in that the head reflector (5) and the main reflector (11) are arranged basically overlapping in the light emission direction.

12. spotlight (40) having a socket (13) for a light source (14) and a socket (13) at least partially surrounding and a light exit opening (42) forming reflector (41) for bundling the light emitted from the light source (14), characterized in that the reflector (41) in a socket (13) surrounding the head reflector (5) and in the light emission direction of the head reflector (5) subsequent and the main reflector (11) forming the light emission opening (42) is divided, wherein at least two elements in the light emission direction of the luminaire (40) relative to the third element and relative to one another can be adjusted by the mount (13) and the two reflector parts (5, 11).

13. Spotlight according to claim 12, characterized in that the movements of the at least two adjustable elements are coupled.

14. Reflector (41) for bundling the light emitted by a light source (14) to be arranged inside the reflector (41), characterized in that the reflector (41) surrounds a socket (13) for the light source (14)

Head reflector (5) and a in the light emission direction of the head reflector (5) adjoining and the light emitting aperture (42) forming the main reflector (11) is divided, wherein on the one hand the socket (13) opposite the two reflector parts

(5, 11) adjustable and on the other hand, the arrangement of the two reflector parts (5, 11) to one another in the light emission direction is changeable.

15. A reflector according to claim 14, characterized in that the head reflector (5) designed shell-shaped and the main reflector (11) is formed by a reflector ring.

16. A reflector according to claim 14 or 15, characterized in that the head reflector (5) and the main reflector (11) are arranged in the light emission direction basically overlapping.