DE202010002744U1 - Device for glare-reduced coupling of light - Google Patents

Abstract

Device for blind-reduced coupling of light from a luminaire having at least one structured surface, on which at least one group (G) of pyramid-shaped structural elements (A, B) is arranged, which comprises a structural element (A) whose base surface is in the form of a hexagon and two structural elements (B) whose bases are in the form of triangles, wherein the bases are formed and arranged such that each side of the triangles adjoin one side of the hexagon and the adjacent sides have substantially the same side length.

Description

object The present invention is an apparatus for glare-reduced Uncoupling light from a luminaire.

transparent provided with a structured surface, mostly plate-shaped Covers have long been used to that of a Light directed light to direct light and thus the Entblendungseigenschaften to improve the luminaire. This reflection and refraction of the Light used on the surfaces of the cover plate to the beam path of the light in the desired manner influence.

The lighting of workplaces has special requirements. These are in the European Standard DIN EN 12464 recorded. The standard lists some criteria by which lighting quality can be assessed. Particularly important criteria are a harmonious luminance distribution, a sufficient illuminance, good uniformity and in particular the limitation of direct and reflected glare. Direct glare is the direct glare of an observer from light emitted by a light placed in the field of view of the observer. Reflected glare is caused by light, which is reflected by reflective surfaces. The light radiating the light does not necessarily have to be within the field of view of the observer. A limitation of reflected glare is particularly important in the field of VDU workstations of great importance, since screens, depending on their screen quality, contribute greatly to the reflected glare.

The differentiate known structural panels for glare control of luminaires usually with each other by the shape of the structuring of the surface used structural elements. Shape and arrangement of the structural elements not only affect the anti-glare properties of the respective Plate, but also their mechanical properties.

Out DE 25 20 429 A1 a translucent cover for lamps is known which has on its outside two sharp-edged groups of equidistant, forming a plurality of main grooves main grooves, which in turn are intersected by further equidistant side grooves, wherein between the main and side grooves pyramid and / or prismatic light guide body lie.

Out DE 201 07 425 U1 is a device for glare a light-emitting lamp on the basis of refraction and / or total reflection of the light with a flat extending plate of predetermined thickness known. On at least one of the two plate surfaces are arranged for structuring prisms, in particular three-sided prisms with mutually parallel and lying in a plane plate axes. The prisms adjoin each other without gaps, each with a side surface lying in the plane of the plate.

Out DE 103 02 564 A1 is a device for glare of a light source in the form of a flat extending plate of predetermined thickness of transparent plastic or transparent glass, in which at least one of the two surfaces of the plate is provided with an optically active structure and at least one surface with a partially transparent coating.

Out DE 10 2006 011 296 A1 a device for the light direction of any light source in the form of a flat extending plate of predetermined thickness of transparent plastic or transparent glass is known in which at least one of the two surfaces of the plate is provided with an optically active microstructure of a plurality of microelements, in their axis of symmetry based on the surface normal of the flat outstretched plate are tilted.

Out DE 10 2006 009 325 A1 a device for glare any bulbs in the form of a flat extending disc of transparent plastic or transparent glass is known in which at least one of the two surfaces of the plate is provided with an optically active microstructure of a plurality of microelements, the light in a preferred, here vertical emission direction can escape.

Out WO 2008/058585 A1 is a transparent plate having a surface structure for largely glare-free coupling of the light generated by a lamp is known, which has more than two each offset by certain angles flocks of straight, parallel extending substantially V-shaped grooves to form the surface structure on at least one side. In this case, the configurable parameters, such as the dimensions of the grooves, their distances within a family and the offset angle are chosen so that remain between the grooves exclusively protruding pyramids or truncated pyramids, which preferably have the same height.

The known microstructure plates have numerous disadvantages. Thus structuring of the surface by means of V-shaped grooves brings about linear sharp-edged depressions in the plate surface. At these sharp-edged recesses Kings NEN by notch effect in particular during transport, installation and installation of the plates mechanical stress peaks arise, which, starting from the groove bottom, lead to the destruction of the plate. It is also disadvantageous if the structural elements used have a low structural diversity. This leads namely to an uneven light output, mainly in a few privileged Rich lines. An observer of a luminaire provided with such a plate determines a clear difference in brightness depending on whether he is looking at the luminaire in one of the preferred directions or in an intermediate direction.

task The present invention is an apparatus for glare-reduced Decoupling light from a luminaire to provide its optical as well as mechanical properties compared to those from the state The art known devices for blinding lights are improved.

These Task is achieved by the device according to the invention dissolved in the features of claim 1. Advantageous developments of the present invention are in reproduced the dependent claims 2 to 7.

The Device for glare-reduced decoupling of light from a Luminaire has at least one structured surface on, on the at least one group of pyramidal Structural elements is arranged, which comprises a structural element, whose base is formed in the form of a hexagon is and two structural elements whose bases in shape are formed by triangles, with the bases are designed and arranged so that each one side of the Triangles adjoin one side of the hexagon and the other adjacent sides are essentially the same page length exhibit.

there the hexagon are preferably as regular hexagon and the triangles are preferably formed as equilateral triangles.

The Device according to the invention preferably a multitude of similar groups of pyramidal ones Structural elements that are arranged area-wide.

The Device for glare-reduced decoupling of light from a Light can according to the invention as a microstructure plate be educated.

at the microstructure plate according to the invention are the pyramidal structural elements preferably as pyramid-shaped depressions formed in the plate material.

The Invention is also directed to a luminaire which is an inventive Microstructure plate comprises.

there the microstructure plate is preferably arranged such that the structured surface facing away from the light source.

The Device according to the invention has both pyramids with hexagonal base as well as pyramids with triangular Base area up. It therefore has two different structural elements. The bases of these structural elements are chosen that they can be arranged nationwide, whereby the available on the microstructure plate Area is optimally utilized. The bases the pyramidal structural elements can have different side lengths. Preferably have but the bases of all pyramidal Structural elements are essentially the same side length on.

advantageously, are the pyramidal structural elements designed so that their bases are essentially in one plane and their side surfaces essentially the same angle of inclination have against this level. According to the invention the value of this angle between 33 ° and 36 °, preferably between 34 ° and 36 °, in particular near 35 °.

in principle can be adjusted by choosing different angles of inclination for the side surfaces of different pyramids increase the structural diversity of the structural elements once more. However, this complicates the production of an inventive Contraption.

The Choice of equal inclination angle for the side surfaces all pyramidal structural elements and the choice of the same Side lengths for all surfaces leads to that the pyramids with triangular base area a lower in height than the pyramids with hexagonal Floor space. This makes the structural diversity of the structural elements further increased, whereby the Entblendungseigenschaften the inventive device can be improved.

The pyramidal structural elements may be formed as pyramids, for example but also as truncated pyramids. A truncated pyramid is understood to mean a structure that results from the fact that the upper tip is removed from a pyramid. The resulting boundary surface of the truncated pyramid does not necessarily have to be flat. However, it may be advantageous if it is planar and in particular parallel to the base of the pyramid. Preferably, the side surfaces of the pyramids shaped structural elements formed flat. According to the invention, however, the side surfaces of the pyramid-shaped structural elements may also be arched, curved, or otherwise curved.

According to one preferred embodiment of the present invention can be based on arranging pyramidal structural elements with triangular base on the microstructure plate be waived. The microstructure plate then has only pyramidal Structure elements with hexagonal base. Become the pyramid-shaped structural elements with hexagonal Base surface area on the microstructure plate arranged, results in a honeycomb structure.

The Formation of the pyramidal structural elements as pyramidal Recesses in the plate material of an inventive Microstructure plate has the advantage that thereby continuous sharp-edged Grooves in the plate material can be avoided. Such a microstructure plate according to the invention is therefore more tolerant of mechanical stress peaks and can consequently be subjected to stronger mechanical loads.

The mechanical load capacity of an inventive Microstructure plate can be further increased by that between the bases of the pyramidal Structure elements web-like connection areas are provided. The web-like connection areas lead in particular for the case that the structural elements as depressions in the plate material are formed so that the surface of the microstructure plate has no sharp-edged burrs. This is the microstructure plate more robust in terms of damage to their structured Surface. The width of the web-like connection areas is according to the invention about 0.1 mm. The edges of the microstructure plate according to the invention preferably have edge radii of at most 0.05 mm on.

The Device according to the invention can be known with the aid of Manufacturing process can be produced. For example, the Device according to the invention by injection molding, by pressing or injection-compression molding or by a stamping process, in particular using an embossing roller. Used to produce a microstructure plate according to the invention an embossing roll used, can be in the extrusion process with an embossing calender microstructure plates of any kind Make length.

When Material for the production of the inventive Device is a variety of conventional thermoplastic Plastics. According to the invention, the material be largely transparent, but it can also be colored. For the preparation of the inventive Device particularly preferred materials are polymethylmethacrylate (PMMA) and polycarbonate (PC).

The structural properties as well as some preferred embodiments The present invention will become more apparent from the drawings explained. Show it:

1a . 1b . 1c three groups of pyramidal structural elements according to the invention;

2 a sectional view of a preferred embodiment of the microstructure plate according to the invention, in which the pyramidal structural elements are formed as depressions in the plate material;

3 a perspective view of the preferred embodiment according to 2 ;

4 a detailed view of the preferred embodiment according to 2 ;

5 a detailed view of another preferred embodiment of the present invention, in which web-like connection regions are provided between the base surfaces of the pyramidal structural elements.

The 1a . 1b and 1c show three inventive groups G ^I-III of pyramidal structural elements. Each of the groups G ^I-III comprises a pyramidal structural element A with a hexagonal base and two pyramidal structural elements B with a triangular base. The bases are formed as regular hexagons or equilateral triangles. The pyramidal structural element A with hexagonal base has six triangular side surfaces 1 ^I-VI on. The pyramid-shaped structural elements B with a triangular base area each have three triangular side surfaces 2 ^I-III on. Two of these side surfaces each 2 ^I-III border each other in the edges K ^I-III .

For the first group G ^I ( 1a ) The pyramid-shaped structural elements B are arranged with triangular base on opposite sides of the base of the pyramidal structural element A hexagonal base. For the second group G ^II ( 1b ) The pyramid-shaped structural elements B are arranged with triangular base on adjacent sides of the base of the pyramidal structural element A with hexagonal base. For the third group G ^III ( 1c ) is between on the sides of the hexagonal base, on which the structural elements B are arranged with a triangular base, exactly one side, on which no structural element is arranged.

The in the 1a . 1b and 1c illustrated groups G ^I-III of pyramidal structural elements can be arranged so that they cover a surface gapless. In the in the 1a and 1b shown groups G ^I and G ^II , first, a horizontal row of area-covering structural elements are formed by the fact that copies of the group are arranged laterally next to the group shown at a suitable distance. At the in 1c Group G ^III shown needs to additionally be rotated every second copy through 180 °. If one places subsequently copies of this horizontal row at a suitable distance above or below the row, the result is a comprehensive arrangement of pyramid-shaped structural elements. There are two possibilities for aligning two horizontal rows to one another: either the two rows are arranged such that two pyramid-shaped structural elements with a hexagonal base surface lie directly above one another, ie adjoin one another with one of the sides of their base areas. Or the rows are arranged so that directly above or below each structural element with a hexagonal base surface is a structural element with a triangular base. This arrangement is particularly advantageous and lies in the 2 to 5 underlying microstructure plates.

2 shows a sectional view of a preferred embodiment of the microstructure plate according to the invention M. In this microstructure plate M, the pyramidal structural elements are formed as depressions in the plate material. In the section of the microstructure plate M according to the invention, a pyramid-shaped structural element A with a hexagonal base is arranged centrally. Left and right of each two pyramidal structural elements B are arranged with a triangular base. The side surfaces 1 ^I-VI and 2 ^I-III have an inclination angle α with respect to the plane in which the microstructure plate M extends. The value of the inclination angle α is 35 °. The two adjacent side surfaces 2 ^I-III formed edges K ^I-III have an inclination angle β with respect to the plane. The value of the angle β is about 19.3 °. In the in 2 As shown, the pyramid-shaped structural element A with a hexagonal base has a width b ₁ and the pyramidal structural elements B with a triangular base have a width b ₂ . The pyramidal structural element A with a hexagonal base has a height h ₁ , the pyramidal structural elements B with a triangular base have a height h ₂ . The height h ₁ is about 0.70 mm, the height h ₂ is about 0.23 mm. The thickness d of the microstructure plate M is 2 mm.

According to the invention, the thickness d of the microstructure plate M can also be more than 2 mm. The height h ₁ is according to the invention between 0.35 mm and 3.50 mm, preferably between 0.50 mm and 1.00 mm. The height h ₂ is according to the invention between 0.12 mm and 1.17 mm, preferably between 0.17 mm and 0.33 mm. From the heights h ₁ and h ₂ and the inclination angle α, the widths b ₁ and b ₂ can be determined from the geometry of the pyramid-shaped structural elements A and B.

3 shows a perspective view of the preferred embodiment of the microstructure plate M according to the invention according to 2 , The cutting direction R, the sectional view in 2 is underlying, is indicated by a dashed line. In this illustration, it can clearly be seen that the pyramid-shaped structural elements partly have a base area in the form of an equilateral triangle, partly a base area in the form of a regular hexagon, and are arranged over the entire area. The bases of seven structural elements A with a hexagonal base and the bases of 13 structural elements B with a triangular base are highlighted by borders. The bases of the structural elements are arranged so that they cover the surface of the microstructure plate M gapless. This results in the structured surface of the microstructure plate M three main directions H ^I-III , in 3 characterized by black lines. The edges of the bases of the structural elements are aligned along these main directions H ^I-III and form continuous, intersecting lines. This facilitates the production of a stamping tool with which the structure of the microstructure plate M according to the invention can be produced. The structure required on the embossing tool can be created by the application of continuous V-shaped grooves along the main directions H ^I-III .

4 shows a detailed view of the microstructure plate M according to the invention 2 , The side surfaces 1 ^I-VI and 2 ^I-III the pyramid-shaped structural elements A and B have an inclination angle α of 35 ° relative to the plane in which the base surfaces are arranged. As a result, the opposing side surfaces of a hexagonal base pyramidal structural element enclose an angle of 110 °. Also in this view, it is clear that the base surfaces of the pyramidal structural elements are arranged so that their edges form continuous lines. Along these lines are sharp-edged ridges S.

5 shows a further preferred embodiment of the microstructure plate M according to the invention in this embodiment, web-like connecting portions V ^{I-III are} provided between the base surfaces of the pyramidal structural elements. The width W of the web-like connecting regions V ^I-III is according to the invention about 0.1 mm. Thus, the structured surface of this microstructure plate has no sharp-edged ridges, so that the susceptibility of the microstructure is reduced for damage.

A

pyramidal Structure element with hexagonal base

1 ^I-VI

faces of the structural element A

B

pyramidal Structural element with triangular base

2 ^I-III

faces of the structural element B

K ^I-III

Edges between the side surfaces 2 ^I-III

G ^I-III

groups of pyramidal structural elements

M

Microstructure plate

α

Inclination angle of the side surfaces 1 ^I-VI and 2 ^I-III

β

Inclination angle of the edges K ^I-III

b ₁

width the structural elements A

b ₂

width the structural elements B

h ₁

height the structural elements A

h ₂

height the structural elements B

d

thickness the microstructure plate M

R

cutting direction

H ^I-III

main directions

S

sharp Bone

V ^I-III

web-like connecting areas

W

Width of the web-like connection areas V ^I-III

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 2520429 A1 [0005]
• - DE 20107425 U1 [0006]
• - DE 10302564 A1 [0007]
• DE 102006011296 A1 [0008]
• - DE 102006009325 A1 [0009]
• WO 2008/058585 A1 [0010]

Cited non-patent literature

• - Standard DIN EN 12464 [0003]

Claims (7)

Device for glare-reduced decoupling of Light from a luminaire with at least one structured surface, on the at least one group (G) of pyramidal Structural elements (A, B) is arranged, which is a structural element (A) whose base is in the form of a hexagon is formed and two structural elements (B) whose bases are formed in the form of triangles, the bases are designed and arranged so that each one side of the Triangles adjoin one side of the hexagon and the other adjacent sides are essentially the same page length exhibit. Apparatus according to claim 1, wherein the hexagon as a regular hexagon and the triangles as equilateral triangles are formed. Device according to one of the preceding claims with a multitude of similar groups (G) of pyramidal Structural elements (A, B), which are arranged area-wide are. Microstructure plate (M), which is a device according to one of the preceding claims. Microstructure plate (M) according to claim 4, wherein the pyramidal structural elements (A, B) as pyramidal Recesses are formed in the plate material. Luminaire with a microstructure plate (M) according to claim 4 or 5. Luminaire according to claim 6, wherein the microstructure plate (M) is arranged so that the structured Surface facing away from the bulb.