Lamp

Abstract

A luminaire including a luminaire base, a luminaire head and a luminaire stand extending between the luminaire base and the luminaire head, wherein the luminaire head includes first illuminants, which are arranged in a common plane, and which are adapted to extract a first, indirect fraction of light, and wherein the luminaire head includes a glare suppression arrangement, which is arranged in parallel to the plane, and includes a light-directing foil and shielding elements, wherein the shielding elements are arranged so that a beam spread of the indirect fraction of light after passage through the glare suppression arrangement is limited to 30 with respect to a vertical to the plane, and wherein the glare suppression arrangement in the direction of the vertical has a maximum height of 2.0 cm.

Claims

1. A luminaire (1), comprising a luminaire base (2), a luminaire head (3) and a luminaire stand (4) extending between the luminaire base (2) and the luminaire head (3), wherein the luminaire head (3) comprises first illuminants (5), which are arranged in a common plane (E), and which are adapted to extract a first, indirect fraction of light (6), and wherein the luminaire head (3) comprises a glare suppression arrangement (7), wherein the glare suppression arrangement (7) is arranged parallel to the plane (E) and comprises a light-directing foil (8) and shielding elements (9), wherein the shielding elements (9) are arranged so that a beam spread () of the indirect fraction of light (6) after passage through the glare suppression arrangement (7) is limited to 30 with respect to a vertical (V) to the plane (E), and wherein the glare suppression arrangement (7) in a direction of the vertical (V) has a maximum height (H) of 2.0 cm.

2. The luminaire (1) according to claim 1, wherein the beam spread () of the indirect fraction of light (6) after passage through the glare suppression arrangement (7) is limited to 22 with respect to the vertical (V) to plane (E).

3. The luminaire (1) according to claim 2, wherein the glare suppression arrangement (7) in the direction of the vertical (V) has a maximum height (H) of 0.8 cm.

4. The luminaire (1) according to claim 3, wherein each first illuminant (5) is arranged in a mixing chamber (20).

5. The luminaire (1) according to claim 4, wherein the luminaire head (3) comprises second illuminants (16) for extraction of a second, direct fraction of light.

6. The luminaire (1) according to claim 5 wherein the second illuminants (16) are arranged in a luminaire mounting (17), which is received in a seat (18) formed on the luminaire head (3), wherein the luminaire mounting (17) is pivotable about two axes perpendicular to each other relative to the seat (18).

7. The luminaire (1) according to claim 5, wherein the second illuminants (16) are arranged in a common plane (D), wherein the plane (D) is in parallel to the plane (E) of the first illuminants (5).

8. The luminaire (1) according to claim 7, wherein the direct fraction of light extracted by the second illuminants (16) is radiated asymmetrically, wherein a maximum of radiation is in an angular range between 25 and 45 with respect to a vertical to plane (D).

9. The luminaire (1) according to claim 8, wherein the second illuminants (16) are arranged in a luminaire mounting (19) which is rotatable about an axis (F) extending perpendicularly to the planes (E) and (D).

10. The luminaire (1) according to claim 9, wherein the direct fraction of light and the indirect fraction of light (6) are controllable independent of each other.

11. The luminaire (1) according claim 10, wherein the luminaire (1) has a user identification by means of which the direct fraction of light can be automatically adjusted depending on the user.

12. The luminaire (1) according to claim 11, wherein the indirect fraction of light (6) is controllable via a sensor system.

13. Luminaire (1) according to claim 12, wherein the luminaire (1) is formed as a table luminaire and comprises has a total height of 60 cm to 70 cm.

14. The luminaire (1) according to claim 13, wherein the luminaire (1) is adjustable in height.

15. The luminaire (1) according to claim 14, wherein the luminaire head (3) is cuboid-shaped.

16. The luminaire (1) according to claim 15 wherein the cuboid-shaped luminaire head (3) has a length between 20 cm and 40 cm and a height between 20 cm and 30 cm.

17. The luminaire (1) according to claim 16, wherein the luminaire head (3) is fastened to the luminaire stand (4) in a pivotable manner.

18. The luminaire (1) according to claim 1, wherein the glare suppression arrangement (7) in the direction of the vertical (V) has a maximum height (H) of 0.8 cm.

19. The luminaire (1) according to claim 1, wherein each first illuminant (5) is arranged in a mixing chamber (20).

20. The luminaire (1) according to claim 1, wherein the luminaire head (3) comprises second illuminants (16) for extraction of a second, direct fraction of light.

21. The luminaire (1) according to claim 7, wherein the second illuminants (16) are arranged in a luminaire mounting (19) which is rotatable about an axis (F) extending perpendicularly to the planes (E) and (D).

22. The luminaire (1) according to claim 5, wherein the direct fraction of light and the indirect fraction of light (6) are controllable independent of each other.

23. The luminaire (1) according to claim 5, wherein the luminaire (1) has a user identification by which the direct fraction of light can be automatically adjusted depending on the user.

24. The luminaire (1) according to claim 1, wherein the indirect fraction of light (6) is controllable via a sensor system.

25. Luminaire (1) according to claim 1, wherein the luminaire (1) is formed as a table luminaire and has a total height of 60 cm to 70 cm.

26. The luminaire (1) according to claim 1, wherein the luminaire (1) is adjustable in height.

27. The luminaire (1) according to claim 1, wherein the luminaire head (3) is cuboid-shaped.

28. The luminaire (1) according to claim 1, wherein the luminaire head (3) is fastened to the luminaire stand (4) in a pivotable manner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Below, this invention is explained more in detail by examples and with reference to the attached drawings, wherein:

(2) FIG. 1 shows an embodiment of a luminaire according to this invention in a perspective view diagonally from above;

(3) FIG. 2 shows the luminaire from FIG. 1 in another perspective view diagonally from below;

(4) FIG. 3 shows a section taken through the luminaire head of the luminaire from FIGS. 1 and 2 with an exemplary radiation characteristic of an illuminant when the shielding elements are removed;

(5) FIG. 4 shows the representation from FIG. 3 but with an exemplary radiation characteristic of an illuminant when the shielding elements are inserted;

(6) FIG. 5 shows the representation from FIG. 4, wherein the radiation characteristics are shown for all illuminants; and

(7) FIG. 6 shows a section taken through a luminaire head in an alternative embodiment.

DETAILED DESCRIPTION OF INVENTION

(8) FIG. 1 shows a luminaire designated generally with 1, comprising a luminaire base 2, a luminaire head 3 and a luminaire stand 4 extending between the luminaire base 2 and the luminaire head 3. The luminaire 1 is configured as a table luminaire and can be positioned with its luminaire base 2 on a table, for example, on a desk. The luminaire head 3 is cuboid-shaped and comprises an upper side 11, an underside 12 in parallel to the upper side 11, wherein the underside 12 is facing the luminaire base 2, and a circumferential border 13 arranged between the upper side 11 and the underside 12. The distance X between the upper side 11 and the underside 12 is 1.4 cm. The entire luminaire 1 has a height of approximately 66 cm.

(9) The upper side 11 of the luminaire head 3 can be made of a transparent material, for example, of glass or any suitable, translucent plastic material. The upper side 11 is not part of the glare suppression arrangement which is explained below. In a gap between the upper side 11 and the underside 12 of the luminaire head 3, first illuminants 5 are arranged in a plane E in parallel to the upper side 11 and/or the underside 12, as shown in sectional views of FIGS. 3 to 5. The first illuminants 5 are light-emitting diodes (LEDs) which are arranged on a common circuit board. In the luminaire head 3, LEDs are arranged in parallel rows. The light of the LEDs is radiated upwards as an indirect fraction of light 6 through the transparent upper side 11 of the luminaire head 3. The LEDs are selected so that via the indirect fraction of light 6, a mean illuminance of about 300 Lux can be achieved at a workplace, for example, on a desk. In any case, the luminaire 1 is suitable to illuminate a workplace, for example, a desk, according to standard DIN EN 12465/1.

(10) Apart from the first illuminants 5, also a glare suppression arrangement 7 is arranged in the gap between the upper side 11 and the underside 12 of the luminaire head 3, as shown in FIGS. 4 and 5. The glare suppression arrangement 7 is arranged in parallel to the plane E and/or the upper side 11 and the underside 12 of the luminaire head 3, and comprises a light-directing foil 8 and shielding elements 9. The glare suppression arrangement 7 has a height (H) of 0.6 cm. By an arrangement of the glare suppression arrangement 7 in parallel to the plane E is meant that the glare suppression arrangement 7 as a whole is aligned in parallel to the plane E, even if inside the glare suppression arrangement 7 individual elements, such as, for example, the individual shielding elements 7, include a particular angle other than zero with the plane E. The light-directing foil 8 is arranged between the first illuminants 5 and the shielding elements 9 with a distance of only approximately 1 mm from the first illuminants 5. The light-directing foil 8 has a microstructure which filters the light radiated from the first illuminants 5. Here, the microstructure is configured so that light beams emitted by the first illuminants 5 pass through the foil 8 only in a defined angular range, whereas light beams outside said angular range are reflected. The foil 8 can, for example, be a light-directing foil of the Focus line developed by Polyscale GmbH.

(11) FIG. 3 shows the effect of the light-directing foil 8 on the radiation characteristic of a first illuminant 5. For better understanding of the operating principle of the glare suppression arrangement, in the representation of FIG. 3 the shielding elements 9 are deliberately omitted. After passage through the light-directing foil 8, the light of a first illuminant 5 is radiated substantially into two angular ranges: the major portion is radiated as an indirect fraction of light 6 into an angular range between 0 and approximately 20 with respect to the vertical V, another small fraction of light 14 is radiated at an angle of approximately 70 with respect to the vertical V.

(12) When the luminaire 1 is used as a table luminaire with a luminaire head according to the representation in FIG. 3, that means, without shielding elements, a standing viewer would be dazzled by the fraction of light 14 since the luminaire head 3 at a total height of the luminaire 1 of approximately 66 cm and a mean table height of 72 cm is positioned at a height of approximately 138 cm above the floor and thus generally below the eye level of a standing viewer.

(13) In order to prevent this, the luminaire 1 according to this invention comprises in addition to the light-directing foil 8, shielding elements 9 made of metal or plastic, as shown in FIG. 4. It can be seen from FIG. 4 that the fraction of light 14 by the shielding elements 9 arranged between the light-directing foil 8 and the upper side 11 of the luminaire head 3 is shielded so that ultimately only the indirect fraction of light 6 emits from the luminaire head 3. The shielding elements 9 are positioned in parallel rows and offset from the rows of the first illuminants 5 so that the fractions of light 14 emitted from the first illuminants 5 under flat angles are shielded by the shielding elements 9 and are not emitted under flat angles from the luminaire head 3. The dimensions of the shielding elements 9, in particular their height, are aligned here with the precise radiation direction of the fractions of light 14. At the same time, the shielding elements 9 are configured and arranged so that they do not influence in any way the indirect fraction of light 6 radiated within the angular range . In the embodiment shown, the shielding elements 9 are configured as webs with triangular cross section, wherein the height of the individual webs is approximately 5 mm. The angle formed by the two flanks of a web is 62.

(14) Hence, the light emitted by the first illuminants 5, after passage through the glare suppression arrangement 7, exits the luminaire head 3 under a beam spread which is limited with respect to the vertical V to approximately 20. Even at a height of the luminaire head 3 of only approximately 138 cm above the floor, a glare of the standing viewer at simultaneous powerful light extraction is avoided in this way.

(15) As shown in FIG. 2, the luminaire 1 comprises second illuminants 16 apart from the first illuminants 5 which second illuminants 16 are arranged in a luminaire mounting 17. The luminaire mounting 17 is received in a seat 18 formed in the area of its underside 12, and is pivotable relative to the seat 18 about two axes. The second illuminants 16 extract a second fraction of light, not shown here, which is radiated as a direct fraction of light downwards, for example, in the direction of a working surface. Due to pivotability of the luminaire mounting 17, a user can adjust the second, direct fraction of light according to its respective requirements.

(16) FIG. 6 shows an alternative embodiment of the luminaire head 3, wherein the same reference numerals correspond to the same components. In the sectional view shown here, the shielding elements 9 are not visible. The first illuminants 5 are arranged below the light-directing foil 8. Each first illuminant 5 is arranged in a mixing chamber 20, wherein the mixing chambers 20 are formed of an arrangement of plastic webs 21 made of a highly reflective plastic material. The mixing chambers 20 have the function of reflecting light beams which, starting from the first illuminants 5, strike the light-directing foil 8, and are not within the angular range requested for passage and are therefore being reflected by the foil 8, again in the direction of the foil 8. If need be, this process is repeated several times until the radiation finally strikes the foil 8 in the angular range requested for the passage and can pass through the same.

(17) The embodiment of FIG. 6 shows second illuminants 6 for radiation of a direct fraction of light. The second illuminants 16 are arranged in a common plane D which is parallel to plane E of the first illuminants 5. By the second illuminants 16, a direct fraction of light can be radiated substantially downwards, as shown in the representation of FIG. 6. Here, the illuminants 16 and an optical system 22 covering them are configured such that the direct fraction of light is radiated as a widely radiating distribution, not shown here, but asymmetrically, wherein a maximum of radiation is radiated in an angular range between 30 and 40 with respect to an axis F. The angular range, in which the maximum of radiation is located, is suggested in FIG. 6 as a hatched surface G schematically starting from a point on the optical system 22. The axis F extends perpendicularly to the planes E and D. The illuminants 16 are arranged in a luminaire mounting 19 which is formed as a flat, rotatable disk on the underside 12 of the luminaire head. The disk-shaped luminaire mounting 19 is rotatable about the axis F, wherein a user for this purpose can grasp an outer ring 23 of the luminaire mounting 19 and can rotate the luminaire mounting 19 relative to the luminaire head 3. As one can easily see, the maximum of radiation of the direct fraction of light can thereby be directed to another location without it being necessary that the luminaire must be moved or the second illuminants 16 must be pivoted out of the plane D located in parallel to the plane E.

(18) The embodiment of FIG. 6 shows an embodiment of the luminaire according to this invention with mixing chambers 20 and with second illuminants 16 arranged in a luminaire mounting 19 formed as a rotatable disk. But in alternative embodiments of this invention, these two features can also be realized independent of each other, for example, in a combination with individual features of the alternative embodiment shown in the FIGS. 1 to 5.

(19) The first illuminants 5 and the second illuminants 16 and thus the direct fraction of light and the indirect fraction of light 6 are controllable independent of each other, and that means the first and the second illuminants 5, 16 can be switched on and off independent of each other but they can also be dimmed and/or adjusted in their light color and/or color temperature independent of each other. The second illuminants 16 and thus the direct fraction of light can be controlled by the user in a wireless manner, for example, via a smartphone or any other suitable device for mobile communication. The first illuminants 5 are controlled via technical building systems, wherein signals of presence and/or daylight sensors are entered into the control system for this purpose.

(20) The luminaire 1 is suitable as a small, table-mounted luminaire to generate not only a strong, indirect room lighting but also a direct workplace illumination, wherein a glare of standing viewers is effectively prevented due to the specific glare suppression arrangement. The luminaire 1 is characterized above all by the fact that as a smaller, mobile luminaire it can be used in a very flexible manner, and can be repositioned time and again without any great effort. Furthermore, it reduces the number of light horizons compared with conventional lighting systems made of ceiling luminaires or free-standing luminaires in combination with desk luminaires, because not only the indirect fraction of light 6 but also the direct fraction of light are radiated from one single plane defined by the luminaire head 3. Finally, the extremely low height H of the glare suppression arrangement 7 permits a correspondingly flat design of the luminaire head 3, whereby the luminaire also satisfies the requirement of a reduced, modern design.