EP2466196B1 - Lamp - Google Patents

Description

The invention relates to a lamp, in particular an outdoor lamp, with at least one light source, a primary reflector and a secondary reflector, wherein at least a portion of the light of the light source via the primary reflector to the secondary reflector and from there into a region to be illuminated is reflected.

Such a luminaire is known, for example, under the product designation "secondary reflector luminaire, series 988" of the applicant as outdoor luminaire with a light source, a primary reflector and a faceted secondary reflector arranged above the light source. In such an outdoor light, at least part of the light from the light source is reflected via the primary reflector to the secondary reflector and from there downwards into an area to be illuminated. The radiation characteristic of such a luminaire allows a uniform illumination only in a relatively small resulting area.

For many applications, however, a uniform illumination of a wide range in at least one orientation is desired. As an example, the use of the lamp for street lighting is mentioned here. In this application, the uniform illumination of a wide area in one orientation, namely the direction of the road, is desired.

A uniform illumination of a wide area with respect to this alignment by the lights allows a large selectable distance between the lights, so a large mast spacing of these lights.

The document DE 888 533 C discloses a street lamp for fluorescent lamps with a serving as a reflector upper part, which has two reflector surfaces, the saddle roof shape form a common edge and are angled at an obtuse angle to each other. Below the reflector serving as the upper part further reflectors are arranged, wherein at least one fluorescent lamp between the upper part and a reflector arranged underneath is arranged

The invention is therefore based on the object to provide a lamp available, which allows a uniform illumination of a wide range in at least one orientation.

The object is achieved by the features of claim 1. Advantageous embodiments of the invention are specified in the dependent claims.

In the luminaire according to the invention, the secondary reflector is formed by a saddle-roof-shaped arrangement of two reflector surfaces with a common edge, wherein the reflector surfaces face each other α to form an obtuse angle. Due to the inclination between the two reflector surfaces along a common orientation, the light reflected from the primary reflector onto the secondary reflector is reflected in two subregions more or less overlapping or adjoining one another in this orientation, which together produce a broadly illuminated region. Due to the mutually facing arrangement of the reflector surfaces to form an obtuse angle α, ie an angle of 90 ° <α <180 °, multiple reflections are suppressed at the secondary reflector or their effects on the uniform illumination at least reduced. Furthermore, by facing each other Arrangement of the reflector surfaces to form an obtuse angle α measures to avoid a glare in the reflector allows. The arrangement of the reflector surfaces is preferably formed by an integrally formed part of the secondary reflector.

In particular, it is provided that the secondary reflector is arranged above the light source. The secondary reflector is thus a secondary reflector for reflecting in a substantially downwardly directed area. The part of the light reflected by the primary reflector is reflected substantially perpendicularly upwards to the secondary reflector and then from there downwards into the area to be illuminated. Such a lamp is particularly well suited as an outdoor lamp for lighting squares, sidewalks, streets, platforms or the like.

Furthermore, it is preferably provided that the primary reflector has an axis of symmetry and is rotationally symmetrical to this. This symmetry axis of the primary reflector intersects a central region of the saddle-roof-shaped arrangement, in particular the common edge of the reflector surfaces. The point of intersection lies in the middle third of the edge, preferably in the middle of the edge itself.

According to the invention, the edge of the saddle-roof-shaped arrangement with a plane perpendicular to the axis of symmetry of the primary reflector forms a tilting angle β formed as an acute angle. The tilt angle β is preferably a tilt angle β in the range 6 ° ≤ β ≤ 15 °. In the case of a luminaire for illuminating a road, this is in particular a tilting angle β of 11 °.

It is preferably provided that the reflector surfaces of the secondary reflector are arranged mirror-symmetrically with respect to a plane of symmetry, in which the axis of symmetry of the primary reflector is located. It follows - assuming a symmetrical arrangement of light source, primary and secondary reflector - one corresponding symmetrical illumination.

According to a preferred embodiment of the invention, each of the reflector surfaces has a plurality of mutually inclined inclined planar sections, which adjoin one another while forming aligned parallel to the common edge of the reflector surfaces further edges. The desired uniform Illumination of the region which is wide in at least one direction can be achieved by dividing the reflector surfaces into a plurality of planar subsections. These subsections differ in their "angles of attack" with respect to the axis of symmetry at least from their direct neighboring sections. The sections can be different widths.

According to a further advantageous embodiment of the invention, the light source is a semiconductor light source. This semiconductor light source is furthermore preferably designed as a planar arrangement of light-emitting diodes (light-emitting diodes or LEDs: light-emitting diodes). Semiconductor light sources have significantly higher efficiency and longer life than conventional light sources, such as gas discharge lamps. Due to the longer service life, the corresponding luminaires are still not as maintenance-intensive as conventional light sources.

Advantageously, the secondary reflector made of surface-treated aluminum, in particular anodized aluminum. This material is particularly well suited for a luminaire used outdoors because it is corrosion resistant.

According to an advantageous embodiment of the invention, the saddle-roof-shaped arrangement of the reflector surfaces is formed by a metal sheet, wherein the edge and / or the other edges are formed as folded edges.

In a further advantageous embodiment of the invention, the lamp further comprises a secondary reflector circumferentially surrounded veneering device. This veneering device is one of the abovementioned measures for avoiding a glare effect in the region of the reflector. The veneering device preferably surrounds the secondary reflector circumferentially relative to the axis of symmetry of the primary reflector. In particular, secondary reflector and veneering device are integrally formed with each other. By the one-piece Training are secondary reflector and facing each other firmly aligned. An alignment of the secondary reflector within the luminaire can thus be carried out via the veneering device. The veneering device is in particular substantially annular.

The luminaire furthermore preferably has a diffusely scattering luminous element, which is arranged above the secondary reflector and laterally projects beyond it, wherein the secondary reflector is arranged above the light source. If the luminaire is a luminaire whose secondary reflector is arranged above the light source, then this luminaire element is preferably a luminous roof.

Finally, it is advantageously provided that the immediately adjacent to the common edge first sections of the two reflector surfaces with each other the obtuse angle α of 98 ° - 102 °, each adjoining second sections another angle α1 of 109 ° -113 °, the each subsequent thereto third subsections have a further angle α2 of 114 ° -118 ° and the respectively adjoining fourth subsections have a further angle α3 of 88 ° -92 °. Studies or simulations have shown that a particularly uniform illumination of the wide area is possible by such a design of the secondary reflector.

Preferably, the obtuse angle α between the first sections is 100 °, the further angle α1 between the second subsections 111 ° adjoining each other, the further angle α2 between the third subsections 116 ° adjoining each other, and the further angle α3 between them in each subsequent fourth sections 90 °. The first subsections each have a share of 21.4%, the second subsections each have a share of 19.6%, the third subsections each have a share of 27.6% and the fourth subsections each have a share of 30.2% of the total extent of the corresponding reflector surfaces perpendicular to the common edge. In particular, each of the reflector surfaces has a corresponding extension of 94mm.

The invention will be explained in more detail with reference to the accompanying drawings with reference to preferred embodiments.

Figur 1:

eine erste Seitenansicht einer Leuchte gemäß einer bevorzugten Ausführungsform der Erfindung,

Figur 2:

eine zweite Seitenansicht der in Figur 1 gezeigten Leuchte aus einem um 90° gedrehten Blickwinkel,

Figur 3:

einen Sekundärreflektor der in den Figuren 1 und 2 gezeigten Leuchte,

Figur 4:

eine Schnittdarstellung durch den in Figur 3 gezeigten Sekundärreflektor und

Figur 5:

eine Leuchte mit einer Verblendeinrichtung gemäß einer weiteren bevorzugten Ausführungsform der Erfindung.

Show it

FIG. 1:

a first side view of a lamp according to a preferred embodiment of the invention,

FIG. 2:

a second side view of the in FIG. 1 shown lamp from a rotated by 90 ° angle,

FIG. 3:

a secondary reflector in the FIGS. 1 and 2 shown light,

FIG. 4:

a sectional view through the in FIG. 3 shown secondary reflector and

FIG. 5:

a luminaire with a veneering device according to another preferred embodiment of the invention.

The FIG. 1 shows a designed as an outdoor lamp light 10. This outdoor light has the shape of a lantern and is mounted on a mast, not shown here. The lamp 10 has a semiconductor light source 12 designed as a light source, of which, however, only the base in the FIGS. 1 . 2 and 5 is visible. The semiconductor light source 12 is mounted radiating upward for the purpose of optimal final heating in the lower part of the lamp 10. It itself consists either of individual, side by side areally arranged and radiating directly upwards LEDs on a printed circuit board or an LED module, which is covered at the top with a translucent and optionally also diffuse scattering plate.

The luminaire 10 furthermore has a primary reflector 14. This primary reflector 14 is rotationally symmetrical about an axis of symmetry 16. The symmetry axis 16 is vertically aligned and substantially coaxial with the mast, not shown. The primary reflector 14 surrounds the light exit a of the semiconductor light source 12 with respect to the axis 16. The primary reflector 14 and the semiconductor light source 12 are mounted on a common light socket 18.

Above the semiconductor light source 12, a secondary reflector 20 is arranged. The two reflectors 14, 20 are positioned so that radiation of the light source via the primary reflector 14 to the secondary reflector 20 and from there substantially directed downwards in a region to be illuminated is reflected or reflected. The secondary reflector 20 forms a single saddle-roof-shaped arrangement 22 of two in FIG. 1 clearly recognizable reflector surfaces 24, 26 with a common edge 28. The two reflector surfaces 24, 26 are facing each other while forming an obtuse angle α. The obtuse angle α is in the range of 90 ° to 120 °, preferably at 100 °.

Above the secondary reflector 20, a luminous roof 32 is arranged, which is fastened via support rods 34 on the lamp base 18. The underside of the luminous roof 32 has a diffusely scattering surface. The lighting roof 32 thus additionally has the function of a diffusely scattering light element.

In FIG. 1 is still clearly visible that the two reflector surfaces 24, 26 are not flat surfaces, but that each of the reflector surfaces a plurality of mutually inclined portions 24.1 to 24.4; 26.1 to 26.4. These sections adjoin one another in parallel to the common edge 28 of the reflector surfaces 24, 26 aligned further edges 36, 38, 40. This results for each of the reflector surfaces 24, 26 a series of sections 24.1 to 24.4; 26.1 to 26.4 perpendicular to the formation of the common edge 28 of the two reflector surfaces 24, 26th

The FIG. 2 shows the same light 10, like the FIG. 1 , so that only the additionally visible features should be discussed here.

The edge 28 of the saddle-roof-shaped arrangement 22 forms with a plane 30 perpendicular to the axis of symmetry 16 of the primary reflector 14 designed as an acute angle tilt angle β. This tilt angle β is preferably 6 ° to 15 °, particularly preferably - as shown here in the exemplary embodiment - 11 °.

The FIG. 3 shows the secondary reflector 20 with the saddle-roof-shaped arrangement 22 of the reflector surfaces 24, 26 in detail. In this illustration, it is clear that each of the reflector surfaces 24, 26 of four sections 24.1 to 24.4; 26.1 to 26.4.

FIG. 4 shows the concrete dimension of the reflector surfaces 24, 26 of the secondary reflector 20. Each of the symmetrically formed reflector surfaces 24, 26 has an extension in the direction of the sequence of sections 24.1 to 24.4; 26.1 to 26.4 of b = 94 mm. In this case account b1 = 20.1mm thereof on a first section 24.1, 26.1. In each case adjoining second sections 24.2, 26.2 accounts b2 = 19.6mm. These second sections 24.2, 26.2 together form an angle α1 of 111 °. The respectively adjoining third sections 24.2, 26.2 together form an angle α2 of 116 °, wherein b3 = 25.9 mm of the extension of the reflector surfaces 24, 26 accounts for these third sections 24.2, 26.2. The respectively closing fourth sections 24.4, 26.4 of the two reflector surfaces 24, 26 form an angle α3 of 90 ° with each other. They account for a share of b4 = 28.4mm of extent. This results for each of the reflector surfaces 24, 26 between the first section 24.1, 26.1 and the second section 24.2, 26.2 an angle of 5.5 °, between the second section 24.2, 26.2 and the third section 24.3, 26.3, an angle of 2.5 ° and between the third section 24.3, 26.3 and the fourth Part 24.4, 25.4 an angle of -13 °.

The FIG. 5 essentially shows the same lamp 10, which is also in the FIGS. 1 and 2 is shown. The lamp 10 of FIG. 5 additionally shows an annular veneer (lamination) 42 which circumferentially surrounds the secondary reflector 20. The veneering device 42 is attached to the support rods 34 and in turn carries the secondary reflector 20. Furthermore, the veneering device is made of a special structured reflector material, which harmonizes photometrically with the secondary reflector (Christmas tree structure). Between the lamp base 18 and the light roof 32, the ensemble of semiconductor light source 12, primary reflector 14, secondary reflector 20, veneering device 42 and support rods 34 surrounding clear protective tube 44 is further arranged. This protects the ensemble especially from the weather. Furthermore, the veneering device is made of specially structured reflector material, which harmonizes photometrically with the secondary reflector, for example with a Christmas tree or with a Christmas tree profile.

It follows the following further details for in the FIGS. 1 . 2 and 5 Pictured light 10 or in the FIGS. 3 and 4 illustrated secondary reflector 20: The height of the primary reflector 14 results from the diameter of the light source. A preferred level for a semiconductor light source 12 is 58mm for the luminaire 10 shown. Since no light is to be emitted from the luminaire 10 into the upper hemisphere, the upper edge of the primary reflector 14 and the outer edge of the luminaire roof 32 serve as a shield against the latter directly from the semiconductor light source 12 emitted light. On the other hand, however, the primary reflector 14 may not be so high, the light emitted laterally from the primary reflector 14 will fall back into the primary reflector 14 itself.

The diameter of the upper reflector opening of the primary reflector 14 is preferably 130 mm. The contour of this primary reflector 14 is preferably parabolically curved. A faceting of the inside reflecting the light may be required for directly visible light-emitting diodes. The lower region of the primary reflector 14 encloses the semiconductor light source 12 so that any light leakage between the light source 12 and the primary reflector 14 is avoided.

The secondary reflector 20 is arranged almost centrally between the light roof 32 and the semiconductor light source 12. The secondary reflector 20 decomposes the focused light beam coming from below into two light bundles which adjoin one another and point obliquely downwards to illuminate the area to be illuminated.

The two reflector surfaces 24, 26 span an angle of more than 90 ° and are, as I said, in several sections 24.1 to 24.4; 26.1 to 26.4 divided. These are different angles α, α1 - α3 employed to prevent adverse reflections. Such reflections are present, for example, when light and dark stripes result below the luminaire in that the light guided by the light source onto a reflector surface 24, 26 is reflected by it onto the respective other reflector surface 24, 26. The sections 24.1 to 24.4; 26.1 to 26.4 are dimensioned, arranged and aligned so that although multiple reflections between the reflector surfaces 24, 26 may occur, but these do not affect in light and dark zones in the area to be illuminated below the light 10. Rather, the arrangement, the dimensioning and orientation of these sections are 24.1 to 24.4; 26.1 to 26.4 are chosen such that the multiply reflected light is distributed as homogeneously as possible in the area to be illuminated.

As an alternative to the individual bends 28, 36, 38, 40, the sections 24.1 to 24.4; 26.1 to 26.4 separate from each other, the desired effect can also be achieved with correspondingly curved reflector surfaces 24, 26.

The outline of the secondary reflector 20 is chosen so that it fits into the annular veneering device 38 (lamination).

The secondary reflector 20 is - as stated - inclined by an angle β of preferably 11 ° to the horizontal to distribute the light of a roadside positioned light 10 asymmetric and thus as completely as possible to an area on the road.

Light in the area behind the light 10, which does not fall on the road, is thus minimized in favor of large mast distances of the lights 10. For high pitches or narrow streets, a lesser pitch angle β may be required, whereas smaller pitches or wide streets require a larger pitch angle β. In general, the higher central tip of the secondary reflector 20 faces the road.

The secondary reflector 20 is preferably made of aluminum, which may be provided with a reflection-enhancing coating. The reflector surfaces 24, 26 are preferably made slightly satined to avoid unevenness in the illumination intensity distribution on the road. The degree of gloss depends on the light source. Thus, a semiconductor light source 12 with directly visible LEDs may require a stronger matting of the secondary reflector 20. A metallized (coated) plastic version of the secondary reflector 20 is also possible, preferably with a metallized coating.

The veneering device 38 for laminating the secondary reflector 20 has two functions: First, it denies the direct view of the photometrically effective reflector contour of the Secondary reflectors 20 and on the other hand, it shields light flux components, which are directed by the secondary reflector 20 across the street and could possibly cause glare in neighboring buildings. Also, a one-piece design of the secondary reflector 20 and facing device 38 is possible.

Part of the light emitted by the light source passes the secondary reflector 20 and strikes directly on the diffuser, which is painted white from below. From there it is scattered back into the lower hemisphere to illuminate the street near the luminaire.

LIST OF REFERENCE NUMBERS

10

lamp

12

Semiconductor light source

14

Primary reflector 14

16

axis of symmetry

18

light socket

20

secondary reflector

22

arrangement

24

reflector surface

24.1 - 24.4

sections

26

reflector surface

26.1 - 26.4

sections

28

edge

30

level

32

Canopy

34

Handrails

36

further edge

38

further edge

40

further edge

42

Verblendeinrichtung

44

thermowell

α

dull angle

β

tilt angle

α1

another angle

α2

another angle

α3

another angle

Claims (10)

1. A lamp (10), especially an outdoor lamp, comprising at least one light source, a primary reflector (14) with an axis of symmetry (16), and a secondary reflector (20), wherein at least a portion of the light of the light source can be reflected via the primary reflector (14) to the secondary reflector (20), and from there into a region to be illuminated, wherein the secondary reflector (20) is formed by a saddle-roof-shaped assembly (22) of two reflector surfaces (24, 26) with a common edge (28), wherein the reflector surfaces (24, 26) face each other by forming an obtuse angle (α), characterized in that the edge (28) of the saddle-roof-shaped assembly (22) forms an angle of inclination (β) arranged at an acute angle, especially an angle of inclination (β) in the range of 6° ≤ β ≤ 12°, together with a plane (30) perpendicularly to the axis of symmetry (16) of the primary reflector (14).
2. A lamp according to claim 1, characterized in that the reflector surfaces (24, 26) of the secondary reflector (20) are arranged in a mirror-symmetrical way with respect to a plane of symmetry.
3. A lamp according to one of the preceding claims, characterized in that each of the reflector surfaces (24, 26) comprises several flat partial sections (24.1-24.4, 26.1-26.4) which are arranged to be inclined against each other and which are adjacent to each other in further edges (36, 38, 40) aligned in parallel to the common edge (28) of the reflector surfaces (24, 26).
4. A lamp according to one of the preceding claims, characterized in that the light source is a semiconductor light source (12), especially a semiconductor light source which is arranged as a flat assembly of light-emitting diodes.
5. A lamp according to one of the preceding claims, characterized in that the secondary reflector (20) consists of anodized aluminium.
6. A lamp according to one of the preceding claims, characterized in that the saddle-roof-shaped assembly (22) of the reflector surfaces (24, 26) is formed by sheet steel, wherein the edge (28) and/or the further edges (36, 38, 40) are arranged as folded edges.
7. A lamp according to one of the preceding claims, characterized by a facing device (42) which circumferentially surrounds the secondary reflector (20).
8. A lamp according to claim 7, characterized in that the secondary reflector (20) and the facing device (42) are integrally arranged.
9. A lamp according to one of the preceding claims, characterized by a diffusely scattering lamp element which is arranged above the secondary reflector (20) and protrudes laterally from said reflector, wherein the secondary reflector (20) is arranged above the light source.
10. A lamp according to one of the claims 3 to 9, characterized in that the first partial sections (24.1, 26.1) of the two reflector surfaces (24, 26) which are directly adjacent to the common edge jointly form the obtuse angle (α) of 98° - 102°, the respectively adjacent second partial sections (24.2, 26.2) form a further angle (α1) of 109° - 113°, the respectively adjacent third partial sections (24.3, 26.3) form a further angle of 114° - 118°, and the respectively adjacent fourth partial sections (24.4, 26.4) form a further angle of 88° - 92°.

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