WO2012038399A1

WO2012038399A1 - Optical system and illuminator for direct and indirect illumination

Info

Publication number: WO2012038399A1
Application number: PCT/EP2011/066279
Authority: WO
Inventors: Stephan Ebner
Original assignee: Zumtobel Lighting Gmbh
Priority date: 2010-09-21
Filing date: 2011-09-20
Publication date: 2012-03-29
Also published as: DE202010008598U1; EP2619503B1; EP2619503A1

Abstract

An optical system for producing simultaneous light emission in a first solid angle range (r1) around a first direction (R1) and in a second solid angle range (r2) around a second direction (R2) that is 180° opposite to the first direction, more particularly provided for an illuminator for producing light emission into the first solid angle range (r1) for direct illumination and for further light emission into the second solid angle range (r2) for indirect illumination, has a light source (2) for producing a light and an optical element (4) for deflecting a first part of the light into the first solid angle range (r1) and for deflecting a second part of the light into the second solid angle range (r2).

Description

Optical system and luminaire for direct and indirect lighting

The invention relates to an optical system for generating a simultaneous

Li chtab radiation in a first solid angle area around a first direction and in a second solid angle area around a second, the first direction 180 ° opposite direction, in particular for a light for generating a light output in the first solid angle range for a direct illumination and another Light output in the second solid angle range for an indirect

Lighting. Moreover, the invention relates to a corresponding lamp.

A corresponding optical system is known for example from DE 10 2006 018 255 AI as part of a luminaire for generating a direct and an indirect illumination. This luminaire can be adjusted by adjusting a

Light influencing element change the indirect lighting, but not the direct lighting.

The invention has for its object to provide a corresponding optical system that offers better ways of influencing the light output. In addition, a luminaire is to be specified with such an improved optical system.

This object is achieved according to the invention with the objects mentioned in the independent claims. Particular embodiments of the invention are indicated in the dependent claims.

According to the invention, an optical system for generating a simultaneous light beam in a first solid angle area around a first direction and in a second solid angle area around a second, the first direction by 180 ° opposite direction, provided, in particular for a lamp for generating a light output in the first solid angle range for a direct lighting and a further light output in the second solid angle range for indirect lighting. The optical system comprises a light source for generating a light, and an optical element for

Deflection of a first part of the light in the first solid angle region and for deflecting a second part of the light in the second solid angle region.

Due to the fact that the optical element deflects light from the light source partly into the first solid angle range and also partly into the second solid angle range, a change in the relative orientation of the optical element relative to the light source alone can be used to change the light source

Radiation behavior of the optical system cause, which affects both the light output in the first, as well as the light output of the second Raumwinkelb area. In this way, the possibilities for influencing the light output of the optical system are improved.

Preferably, the optical system further comprises a pivot bearing arrangement for pivotally mounting the light source relative to the optical element. This makes it possible that by corresponding pivoting of the light source relative to the optical element, the ratio of the intensity of the light output in the first solid angle range to the intensity of the light output in the second

Reduces the spatial angle range, and in particular also while maintaining the shape of the corresponding light distribution curves with respect to the first and the second solid angle range. Preferably, the optical system further comprises a primary optic element disposed between the light source and the optical element, preferably in the form of a lens associated with the light source. This allows the

Modify radiation characteristic of the light source advantageous and thus further improve the overall optical system.

In this case, the pivot bearing arrangement is also advantageously designed for preferably simultaneous pivoting of the light source and the primary optic element relative to the optical element. This makes it possible to achieve a certain effect on the radiation from a comparatively smaller pivoting movement. Preferably, the optical system further comprises a linear bearing arrangement for the linearly displaceable arrangement of the optical element relative to the light source. This makes it possible that can be changed by corresponding linear displacement of the optical element, the light distribution curves of the light outputs in the first and in the second solid angle range.

Preferably, the optical element has a first, at least partially

reflective surface for deflecting a portion of the light in the first

Raumwinkelb area and a second, at least partially reflecting surface for deflecting a further portion of the light in the second solid angle area. This allows a particularly simple and at the same time effective design of the optical element. In this case, preferably, the light source has a rectilinearly shaped luminous element and / or a plurality of luminous elements, which are arranged along a straight line, wherein the first surface has a first surface normal and the second surface has a second surface normal and the optical system is designed such that the first and the second surface normal in a plane normal to the straight line. As a result, a particularly simple embodiment of the optical system is made possible.

In the case of such a linear arrangement, the optical system further comprises a further light source, which is preferably formed and arranged mirror-symmetrically relative to the first-mentioned light source analogously and / or with respect to a plane passing through a center of the optical element. In this case, the optical system further advantageously has a further pivot bearing arrangement for the pivotable arrangement of the further light source relative to the optical element, wherein preferably the optical system is designed such that the further light source can be pivoted independently of the first-mentioned light source. As an alternative to a linear configuration, the light source may comprise an annular luminous element and / or a plurality of luminous elements arranged along a ring shape, wherein the light source is arranged around the optical element. In the case of a linear design of the light source as well as of an annular one, the optical element in a cross section along the first direction is advantageously hexagonal or quadrangular, preferably square or diamond-shaped. According to a further aspect of the invention, a luminaire is provided,

in particular in the form of a floor lamp or pendant luminaire, which has an optical system according to one of the preceding claims, wherein the luminaire for

Generation of a light output in the first solid angle range for direct lighting and a further light output in the second solid angle range is designed for indirect lighting.

Preferably, the luminaire has a luminaire housing which is arranged around the optical system, the luminaire housing having a first housing

Has light exit opening for emitting light in the first solid angle region and a second light exit opening for emitting light into the second

Solid angle range. In this case, a secondary optical element is advantageously arranged in the first or in the second light exit opening, and preferably a further secondary optical element in the other of the two light exit openings. The invention is explained in more detail below with reference to exemplary embodiments and with reference to the drawings. Show it:

Figures la to lc principle sketches for an embodiment of a

The optical system according to the invention with three different pivot positions of the light sources relative to the optical

Element, 2 is a further schematic diagram of a linear displacement of the optical element relative to a light source, a sketch of a perspective view of an optical system according to the invention with linear light sources and a linear optical element,

Figures 4a, 4b and 4c examples of differently shaped optical elements and

FIGS. 5a and 5b show two sketches for a further exemplary embodiment, in which primary-optical and secondary-optical elements are provided.

In Fig. La, an embodiment of an optical system according to the invention is sketch-like indicated in a cross section. The optical system serves the

Generation of a simultaneous light beam in a first solid angle range r 1 around a first direction R 1 and in a second solid angle range r 2 around a second direction R 2. The second direction R2 is opposite to the first direction R1 by 180 °. With reference to the representation of FIG. 1 a, in simplified terms, a Li chtab radiation "down" and "up" is provided. The optical system is suitable in particular for a luminaire for generating a light output in the first solid angle range or downwards for direct illumination and in the second solid angle range or upwards for indirect illumination. For example, the luminaire may be a standing or suspended luminaire.

The optical system has a light source 2 for generating a light. The light source may be, for example, one or more LEDs (LED:

light-emitting diode) or a fluorescent lamp. Preferably, the light source 2 has a non-isotropic light intensity distribution, that is, for example, a Lambert characteristic. Furthermore, the optical system has an optical element 4, which is for deflecting a first part of the light generated by the light source 2 in the first

Solid angle range rl is formed and for the simultaneous deflection of a second part of the light in the second solid angle region r2. Accordingly, the optical element 4 may also be referred to as a "light directing element".

For a particularly high efficiency of the optical system, it is advantageous if the optical element 4 as large a part of the light source from the second

radiated light in the two solid angle ranges rl, r2 deflects, so for example, at least 90% or 95% or all of the light emitted from the light source 2, so the originating from the light source 2 light in the two solid angle ranges rl, r2 "splits".

For this purpose, the optical element 4 can have a first surface 6, which serves for deflecting into the first solid angle region r 1 and a second surface 8, which is used for the

Redirection in the second solid angle range r2 is used. Accordingly, the first surface 6 is at least partially reflective, as is the second surface 8. For example, the two surfaces 6, 8 may be reflective surfaces.

However, such a mirror execution is not mandatory, it could

For example, a prism or multiple prisms are used for the corresponding deflection. As exemplarily outlined in Fig. La, the optical system may also comprise a further light source 10, which is preferably formed analogously and / or with respect to a plane passing through a center M of the optical element 4 level E mirror symmetrical to the first-mentioned light source 2 and is arranged. The plane E is preferably oriented such that it extends along the first direction Rl.

Also, the optical element 4 is in this case preferably mirror-symmetrical to the plane E formed, so that it in particular, for example, a third surface 12 which, for the corresponding deflection of a part of one of the other Light source 10 radiated light in the first solid angle range rl or down and serves a fourth surface 14, which serves for the corresponding deflection of a further portion of the radiated light from the further light source 10 in the second solid angle range r2 or upwards.

The optical element 4 thus influences both the light output of the optical system downwards, as well as the light output to the top. As a result of a change in the relative position between the optical element 4 and the light source 2, it is thus fundamentally possible to influence the emission behavior of the optical system or the luminaire.

For this purpose, the optical system particularly advantageously has a pivot bearing arrangement (not shown separately in FIG. 1 a), in particular in the form of a pivot bearing arrangement

Rotary bearing arrangement for the pivotable or rotatable arrangement of the light source 2 relative to the optical element 4. The pivot bearing arrangement can be designed so that the light source 2 is a - in Fig. 1 perpendicular to the plane

extending - rotary or pivot axis A is arranged rotatable or pivotable. The arrangement is preferably designed such that the axis of rotation A extends in a small environment of the light source 2 or passes through the light source 2.

The arrangement is furthermore preferably such that the axis of rotation A encloses a right angle with the first direction Rl. Further advantageously, the axis of rotation A is parallel to the plane E. The second light source 10 is preferably by a, analogous to the first mentioned

Swivel bearing arrangement designed and arranged, mounted further pivot bearing assembly. The two pivot bearing arrangements are advantageously designed symmetrically with respect to the plane E. In particular, the optical system can be designed such that the further

Light source 10 can be pivoted independently of the first-mentioned light source 2. This makes it possible for an asymmetrical light distribution to be set in the first solid angle range r 1 and / or in the second solid angle range r 2. Figures lb and lc show the system with changed pivot positions of the light source 2 and the other light source 10. In Fig. Lb the case is sketched in which the light source 2 is rotated or pivoted so that they on the surfaces 6, 8 respectively sends the same amount of light. With solid, dashed and dotted lines, the light distribution is indicated. Here, a solid line means "high intensity", a dashed line "average intensity" and a dotted line "low intensity." Accordingly, it can be seen in Fig. 2 that the light originating from the light source 2 is uniformly divided downward and upward ,

The same applies with reference to the further light source 10.

In contrast, FIG. 1 a shows the case where the light source 2 is rotated in such a way that more light is emitted from the light source 2 into the first solid angle range r 1 than into the second solid angle range r 2. The second light source 10 is brought into an analog rotational position. Thus, in this case, the optical system emits more light down than up. In this case, a corresponding change in the amount of light can be achieved while maintaining the shape of the light distribution curves.

In Fig. Lc, the corresponding case is shown in which the optical system more light is emitted upwards than down.

The optical system can be provided as part of a luminaire, wherein the luminaire is designed to generate a light output in the first solid angle range rl for a direct illumination and a further light output into the second solid angle region r2 for an indirect illumination. The luminaire can be, for example, a floor lamp or a pendant luminaire. The optical system can thus represent a lighting unit of the lamp.

Preferably, the luminaire has a luminaire housing 16, which is indicated by dashed lines in FIG. 1c, which is arranged around the optical system, the luminaire housing 16 having a first light exit opening 18 for emitting light into the first solid angle region r1 or downwards and a second light exit opening 20 for emitting light into the second solid angle region r2 or upwards. By appropriate rotation of the light source 2 and optionally the other light source 10 so the proportion of indirect lighting can be dimmed high or dim down; The proportion of direct lighting can also be dimmed or dimmed down. For example, it can be provided that the first-mentioned light source 2 and the further light source 10 can be pivoted in opposite directions, so that the ratio of the intensities between the direct component and the indirect component of the illumination changes. In this case, an asymmetric light emission can be brought to the bottom and top; This may be advantageous, for example, in the case of a floor lamp, which is provided for illuminating a workplace.

The light source 2 may have a rectilinearly shaped luminous element, for example in the form of a fluorescent lamp and / or a plurality of luminous elements, for example in the form of LEDs, which are arranged along a straight line. With reference to the figures la to lc, the arrangement may be such that the straight line is perpendicular to the plane of the drawing. The same applies to the further light source 10.

In this case, preferably, the optical element 4 is also elongated and arranged to extend with its longitudinal axis parallel to the straight line.

For example, the optical element 4 may have a uniform cross-section over its entire length. As in the example shown, the optical element 4 may be hexagonally shaped in a cross-section along the first direction R1 and normal to the straight line. The optical element 4, however, can also be quadrangular, in particular square or diamond-shaped, viewed in this section.

In this case, the first surface 6 advantageously has a first surface normal N1 sketched by way of example in FIG. 1b and the second surface 8 a second surface normal N2, wherein the optical system is designed such that the first and the second

Surface normal Nl, N2 in a plane normal to the straight line, ie with reference to Fig. Lb in the drawing plane. A further advantageous embodiment is to design the optical system with a linear bearing arrangement for the linearly displaceable arrangement of the optical element 4 relative to the light source 2. Preferably, the arrangement is such that the optical element 4 along the first direction Rl can be linearly displaced.

This configuration makes it possible to change the light distribution curve of the light emitted from the optical system or the lamp. For example, in this way, an opening angle of the light emitted downwards or upwards can be increased or decreased.

In Fig. 2 this operation is outlined. In this case, in the right half of the sketch, the optical element 4 is shifted from a center position shown in the left half down.

As already mentioned, the first light source 2 and also the optical element 4 may be elongate, with the light source 2 and the optical element 4 in this case preferably being arranged aligned parallel to one another. Accordingly, this arrangement may be referred to as a linear illumination arrangement and the optical system is particularly well suited for such linear

Lighting arrangements. In Fig. 3, another embodiment is sketched outlined having such a linear design. The reference numerals are used analogously below and only the differences from the first-mentioned embodiment shown.

In the example shown in Fig. 3, the light source 2 is given in the form of LEDs, which are arranged along the straight line G. The LEDs can be arranged on an elongated circuit board 26 and be thermally connected to a heat sink 22 for effective heat dissipation, which is preferably arranged opposite the LEDs with respect to the circuit board 26. The axis of rotation A may extend parallel to the straight line G and, for example, through the heat sink 22; it can also coincide with the line G A rotation of the first light source 2 is indicated by a double arrow 24. The further light source 10 may be formed analogously and be arranged with respect to the optical element 4 on the opposite side.

The optical element 4 is preferably oblong in this example and has a longitudinal axis L which is arranged parallel to the straight line G. In the shown

For example, the optical element 4 is not hexagonal in cross-section, but quadrangular, namely diamond-shaped.

However, the invention is not limited to such linear arrangements. It is also suitable, for example, for an annular light source, such as an annular, but also, for example, a polygonal annular, for example rectangular shaped light source. The light source may have an annular luminous element and / or a plurality of luminous elements,

For example, LEDs arranged along a ring shape around the optical element.

In this case, the optical element may be centrally located with respect to the ring shape. In FIGS. 4b and 4c, two different shapes for an optical element are sketched by way of example, which are suitable in this case.

For example, as sketched in FIG. 4b, the optical element

be formed rotationally symmetrical, wherein the axis of symmetry S with respect to the light source arranged centrally and the ring shape is oriented enforcing. But it is also an angular design of the optical element possible, as exemplified in Fig. 4c sketched. In FIG. 4 a, an optical element is sketched for comparison, as corresponds to the example shown in FIG. 3.

Depending on the application and its requirements, the optical system may also comprise at least one further optical element. This will be explained in more detail by way of example with reference to FIGS. 5a and 5b.

Between the light source 2 and the optical element 4 may be a primary optic element 30, preferably in the form of a lens, for example in the form of a

Conveying lens, be arranged, which is associated with the light source 2. It can thus in particular for influencing light between the light source 2 and the serve optical element 4. With such a primary optic element 30, the Ab beam characteristic of the light source 2 can be favorably changed. Of course, a corresponding, preferably analog, further primary optical element 30 'may be provided for the further light source 10.

As shown by way of example in FIGS. 5a and 5b, the primary optic element 30 may be a converging lens which focuses a light emanating from the light source 2, for example, forms it into parallel beams. The primary-optic element can also be provided, for example, in the form of an oblong, in cross-section U-shaped, reflector, by which a light emission of the light source in the direction of the optical element 4 is supported; For example, such a reflector may extend around an elongate fluorescent lamp that forms the light source.

The pivot bearing assembly may be configured to pivot the light source 2 and the primary optic element 30 relative to the optical element 4. Preferably, the pivot bearing assembly for simultaneously pivoting the light source 2 and the primary optic element 30 is formed relative to the optical element 4. However, it can also be provided that the pivot bearing arrangement is not designed for the pivotable mounting of the primary optic element 30, so that therefore the light source 2 is rotated without the primary optic element 30 or

can be swiveled. The same applies in turn, if necessary, for the further pivot bearing arrangement. A design for simultaneously rotating or tilting the light source 2 and the primary optic element 30 allows only a rotation through a smaller angle of rotation to achieve a certain optical effect.

In the example shown in Figures 5a, 5b, the pivot bearing assembly is not designed to pivot the primary optic element 30 and also the further pivot bearing assembly is not for pivoting the further primary optic

Elements 30 ^' . In this case, a state is shown in Fig. 5b, in which the two light sources 2, 10 are rotated so that more light is emitted downwards than upwards. Furthermore, the optical system may have a secondary optical element 32, which is arranged downstream of the optical element 4 in the sense of the light path. In particular, as shown by way of example in FIG. 5 b, a corresponding luminaire with the first light exit opening 18 may be provided, in which the secondary optic element 32 is arranged. With such a secondary optical element 32, the

"Final" radiation characteristics of the optical system or the lamp are affected.

The secondary optical element may have, for example, reflective and / or diffuse light-influencing properties; For example, it may be a reflector, a diffuser or a micro-prism optics.

The same applies in turn with respect to a possible further secondary optical element 32 'or with reference to the further light exit opening 20 of the

Luminaire housing 16.

With regard to the operation of the optical system or the light can be provided that a pivoting or rotation of the light source 2 and

optionally the primary-optic element 30 or the further light source 10 and possibly the further primary-optic element 30 ^'are manually carried out;

the same applies with respect to the displacement of the optical element 4 by means of the linear bearing assembly.

But it can also be provided a motor-driven adjustment or the use of a special tool. As a rule, a desired light distribution is set as part of the installation of a corresponding lamp, which is then changed at later times only rarely.

Claims

claims

Optical system for generating a simultaneous light beam radiation in a first solid angle range (rl) around a first direction (Rl) and in a second solid angle range (r2) around a second direction 180 opposite to the first direction (R2);

in particular for a luminaire for generating a light output in the first Raumwinkelb range (rl) for a direct illumination and a further light output in the second solid angle range (r2) for an indirect

Lighting, comprising

a light source (2) for generating a light,

marked by

- An optical element (4) for deflecting a first part of the light in the first solid angle region (rl) and for deflecting a second part of the light in the second solid angle region (r2).

Optical system according to claim 1,

still having

- A pivot bearing assembly for pivotally mounting the light source (2) relative to the optical element (4).

Optical system according to one of the preceding claims,

still having

- A, between the light source (2) and the optical element (4) arranged, primary optic element (30), preferably in the form of a lens which is associated with the light source (2).

Optical system having the features mentioned in claims 2 and 3, in which the pivot bearing arrangement is designed for preferably simultaneous pivoting of the light source (2) and the primary optic element (30) relative to the optical element (4). Optical system according to one of the preceding claims,

still having

- A linear bearing assembly for linearly displaceable arrangement of the optical element (4) relative to the light source (2).

Optical system according to one of the preceding claims,

in that the optical element (4) has a first, at least partially reflecting surface (6) for deflecting part of the light into the first

Solid angle range (rl) and a second, at least partially reflecting surface (8) for deflecting a further portion of the light in the second solid angle region (rl).

Optical system according to claim 6,

in which the light source (2) has a rectilinearly shaped luminous element and / or a plurality of luminous elements which are arranged along a straight line (G) and in which the first surface (6) has a first surface normal (N1) and the second surface (8) has a second surface normal (N2) and the optical system is designed such that the first and the second surface normals (Nl, N2) extend in a plane normal to the straight line (G).

Optical system according to one of the preceding claims,

still having

- Another light source (10), which is preferably formed and arranged analogously and / or with respect to a through a center (M) of the optical element (4) extending plane (E) mirror symmetrical to the first-mentioned light source (2).

Optical system according to claim 8,

still having

a further pivot bearing arrangement for the pivotable arrangement of the further light source (10) relative to the optical element (4), wherein preferably the optical system is designed such that the further

Light source (10) independent of the first mentioned light source (2) can be swiveled.

Optical system according to one of claims 1 to 6,

wherein the light source comprises an annular luminous element and / or a plurality of luminous elements arranged along a ring shape, the light source being arranged around the optical element (4).

Optical system according to one of the preceding claims,

in which the optical element (4) in a cross section along the first direction (Rl) viewed hexagonal or square, preferably square or diamond-shaped.

Luminaire, in particular floor lamp or pendant luminaire, comprising

an optical system according to one of the preceding claims,

wherein the light for generating a light output in the first

Solid angle range (rl) for a direct illumination and a further light emission in the second solid angle range (r2) for an indirect

Lighting is formed. 13. Luminaire according to claim 12,

still having

- A lamp housing (16) which is arranged around the optical system, wherein the lamp housing (16) has a first light exit opening (18) for emitting light in the first solid angle range (rl) and a second light exit opening (20) for dispensing Light in the second

Solid angle range (r2).

Luminaire according to claim 13,

further comprising a secondary optical element (32) which is arranged in the first light exit opening (18) or in the second light exit opening (20) and preferably a further secondary optical element (32 ') which is arranged in the other of the two light exit openings (18, 20 ) is arranged.