DE102015105505A1 - Multifunctional lighting cover with direct light area - Google Patents

Abstract

The invention relates to a luminaire cover for installation in a light exit opening of a luminaire with a translucent surface element arranged in the beam direction in front of a lamp to form a light exit surface which has an upper side facing the luminous means in the installed position and an underside facing away from the luminous element, the surface element having an impurity region , In order to provide a luminaire for the realization of various lighting concepts for the realization of variable luminous fluxes in a small space with favorable glare properties, the invention proposes to provide a central clear area which is enclosed on the top side by the impurity area and on the bottom by a coating area, and the coating region overlaps the impurity region to form an overlap region.

Description

The invention generally relates to a translucent, flat body. Such photometric bodies are used in particular as luminaire covers for covering or closing a light exit opening of a luminaire.

In particular, the invention relates to a luminaire cover used in a light exit opening of a luminaire, comprising a arranged in the beam direction in front of a light-transmitting, preferably flat design surface element to form a light exit surface, which has a light bulbs in installation position facing top and a side facing away from the light source bottom, wherein it has a direct light region designed for the unbroken passage of a light emitted by the light source and an impurity region with an impurity structure for the reflection of the light.

State of the art

A luminaire usually comprises a luminaire housing for accommodating a luminous means and optics for bundling the light and / or directing the light emitted by the luminous flux. Usually, the lamp housing is designed as a shell-like or trough-shaped body, which is mounted with its closed top below or in a ceiling, depending on whether a recessed lighting situation with recessed in the ceiling lamp, a surface lighting situation, with a patch on the ceiling Luminaire or on the ceiling underside fixed lamp or even a pendant lamp with suspended below the ceiling ropes or cables to be realized to meet the relevant lighting application requirement for the application.

These are very different today and it will be required for the different applications different light flux or preferred light fluxes. So z. B. in a shop (shop area) given a requirement profile of 6000 lumens per light, because the ceilings are naturally slightly lower at a height of 2 to 2.50 m, whereas in industrial areas higher demands on the light streams to be provided, in particular about 12,000 lumens because a larger area must be illuminated and the ceilings in these areas are usually higher, eg. B. 5 m and more.

In addition to sufficient light output or sufficient luminous flux but also glare or a limitation of glare in the implementation of the respective Sehaufgabe be considered. Basically, glare is caused by bright areas in the field of vision. This can occur either directly from the lamp or a light emitted light (direct glare) or after the reflection of high luminance on shiny surfaces (reflection) and should be avoided.

Sometimes, however, for special applications, eg. As in the lighting of entrance halls and festive rooms, higher and stimulating luminance and contrast to the environment desirable, provided that the light sources serve primarily as decorative elements. Glare can cause errors, fatigue, and accidents, limiting them to what is important today, especially on VDU workstations.

An aforementioned lamp works so far for the realization of the primary visual task with a direct light component, which is irradiated directly from the illuminant to the visual task, and indirect light, which thus serves to illuminate or illuminate the surrounding space next to the current visual task.

In the development of modern luminaires, the development of multi-dimensional requirement profiles are exposed because these solutions u. a. provide high luminous flux of 6000 to 12,000 lumens, are economically efficient and realize this in a limited space. Today, in addition to technical requirements, luminaires must also meet more and more design requirements, which regularly results in low overall heights of the luminaire housing for installation as a recessed luminaire.

So when using trained as an LED module bulbs, ie arranged in a grid or in a desired arrangement on a carrier LEDs heights of the luminaire housing of a maximum of 15 mm quite usual requirement profiles, making only 15 mm for the installation of the bulb and the Illuminant associated optics, often designed as the individual LEDs in the radiation direction associated and arranged in the lamp housing lenses is available. Thus, therefore, the LED module and the optics must be arranged within the lamp housing, which then adjoin directly to the lighting cover or the disc-shaped lamp cover. Finally, in this overall problem, the waste heat generated by the LED bulbs must be taken into account and compensated, which is an omnipresent problem with LEDs and which is aggravated considerably by the small installation space.

Technical problem / task

Based on this prior art, the present invention seeks to avoid the disadvantages mentioned above at least partially and in particular to provide a luminaire for different applications, which can realize variable light fluxes adapted to the visual task to be realized, while having advantageous glare properties and current requirements complies with the design, so it can be used and used for the realization of various lighting concepts.

invention

According to the invention this object is achieved in a luminaire cover of the type mentioned above in that the impurity region is formed on the top, that the top next to the impurity region has an upper clear area without Störstellstruktur that the bottom has a coating area with a coating producing a diffused light in that the upper and lower clear areas are formed corresponding to each other and arranged on the upper and lower sides and that the coating area overlaps the impurity area to form an overlapping area.

The invention takes advantage of the fact that perceived glare can be reduced by a bright luminous surface, z. B. the direct area, from a less bright surface, z. B. the coating area is surrounded or the ambient luminance is increased by light indirectly (ie, for example, via a scattering on the ceiling) reaches the observer. This reduces the brightness contrast of the bright surface to the environment. By means of the invention, therefore, a diffusely illuminating region is realized over the coating region, which area surrounds the clearing region preferably in a surrounding manner.

The invention thus provides an optical waveguide which is designed for surface irradiation, that is to say for coupling the light over the plane defined by the optical waveguide, whereas the prior art requires edge irradiation, ie implements coupling of the light over the peripheral edge of the optical waveguide. The overlapping area between the coating area and the impurity area can also be referred to as the coupling area according to the invention. This light guide allows a particularly homogeneously illuminated surface without shadow area, in particular at Durchdringungsstellen and holes to the edge. A luminaire cover according to the invention installed in a luminaire generates a direct luminous flux as well as an indirect, diffuse luminous flux over the coating area through the clearing area. For the viewer, therefore, the entire luminaire cover shines particularly homogeneously over the entire, preferably flat cover with low glare value or low UGR value of 19 for the office area to 25 for the industrial sector, in particular lights with luminous fluxes of 12,000 to 17,000 lumens can be realized as needed ,

In the preferred cover formed to realize an additional direct light region, the underside adjacent to the coating region has a lower clear region without coating, the upper and lower clear regions are arranged corresponding to each other, and the coating region overlaps the impurity region to form an overlap region. Corresponding alignment of the upper and lower clear areas is understood to mean that they are arranged one above the other substantially aligned in the radiation direction, so that direct light can radiate through them.

The impurity region on top of the cover preferably comprises a plurality of homogeneously or inhomogeneously applied impurities in the form of notches, grooves, depressions or the like. Particularly cost-effective and uniform, a sandblasting process for the production of impurities has been found. The impurity region is therefore preferably formed by micro-material damage to the cover surface, preferably by sandblasting.

The coating area on the underside of the cover has the essential task to produce a diffused, ie indirect light and thus to realize the most homogeneous possible illumination of the cover, over the entire surface, in particular in the edge region and at penetration points for the fastening means for attachment the cover on a lamp housing.

To reduce the power loss, the coating region preferably has a higher light transmission than the impurity region, whereby a particularly high efficiency is achieved, so that a luminaire with the cover without top-side reflector manages, which in turn is for height optimization or reduction.

The height of a luminaire for the realization of protection according to DIN 40050 respectively. DIN EN 60529 is reduced according to the invention insofar as in addition to the required anyway for the realization of the protection cover no additional light guide is needed. Plastic optical fibers known from the prior art for the realization of edge radiation usually have one minimum thickness between 6-8 mm. Due to the inventively realized combination of optical fiber and IP cover the height for the light guide from the prior art is thus saved in any case.

For a glass cover, the material thickness must cover the z. B. only 3 to 4 mm.

In the development, a special mixture of different ceramics has proven to be a particularly advantageous coating, by which the light reflected within the cover is also partially reflected and partially diffused. This coating is designated by its functional determination in the context of the invention as a "diffuser coating". The coating or the diffuser coating can, for. B. be applied to the underside of the cover with a screen printing process. The diffuser coating is preferably applied homogeneously, but can also be applied to achieve different zones of different thickness or distributed zonally for the desired distribution of the respective visual task desired light distribution curves.

The coating used has in particular a high abrasion resistance, is easy to clean and suitable for operating temperatures up to 480 ° Celsius.

Relevant is the formation of the overlap region formed at the transition between the preferably centrally located on the cover Klärereichen. This overlapping area acts as a coupling-in area for the coupling of light which radiates from the luminous means onto the lower coating area. Due to the greater formation of the coating area in relation to the impurity region, light is partially reflected upwards and from there is reflected back down through the impurities. The result is a light guide, in which, however, the light is not realized as in the prior art at the edge, but over the overlap or coupling region at the edge of the clearing area.

A particularly homogeneous illumination of the cover can be achieved if the overlap or coupling area the clear areas z. B. wreath or annular encloses.

The cover according to the invention is a translucent, flat, in particular disk-shaped body, which preferably consists of glass, because it is thermally resistant, and insofar can be provided with coatings and also by sandblasting on the top the desired micromaterial damage or impurity structure can be realized.

It should be emphasized that all geometries of the cover are adapted to the application variable, in particular the width of the coupling or overlap region.

As light sources LED modules are increasingly used today, ie on a support plate in usually regular intervals or a grid arranged LEDs, which generate point-like light. These bulbs or LED modules are used to reduce the light density and glare and light control with optics, preferably the individual LEDs associated, upstream in the radiation direction lenses are used, which bundle a light emitted by a LED luminous flux and steer accordingly, so bundle or distribute adapted to the respective visual task. Preferably, collimator lenses are used here.

As a particular advantage of the invention has been found that no reflector is required within a lamp housing, which receives the lamp and the optics, because by the total reflection realized within the cover an unwanted escape of light into the interior of a lamp above the through the cover defined coverage can be almost completely avoided, so that almost no loss occurs. For this reason, the lamps provided with the cover according to the invention are to be regarded as very efficient.

The sizes or dimensions of the clear areas, the impurity and the coating area and the resulting overlap area are basically dependent on the visual task to be implemented, ie z. As the use in a shop (shop) or in industrial areas, but can be variable to realize the particular application.

In the development of the invention has been found that can be realized with a glass cover much thinner covers than plastic light guides. So has a glass cover z. As a material thickness of only 3 mm, in contrast to about 10 mm of a plastic optical fiber. This also helps to solve the task to reduce the height in limited space and to realize particularly sophisticated lights with low glare. This is because, as compared to the preferably central clear area, through which the light emitted by the lamp emits direct light onto the visual task, the entire coating area as well lights up and thus enters into the calculation of the UGR value and reduction by increasing the area. As the luminous area around the coating area is increased, the UGR value of the luminaire decreases.

In the preferred embodiment, the correspondingly aligned clear areas are arranged in the center of the cover, so that the impurity and the coating area enclose the respective central clear area circumferentially uniformly. However, an eccentric or off-center arrangement can also be realized in the sense of the invention.

The clear areas of the cover are preferably matched in terms of size corresponding to the size of the luminous means, ie correspond approximately to its size or slightly larger.

When using the preferred LED modules or LEDs as bulbs with a size of z. B. 250 × 294 mm, the upper clear area about its dimensions, ie also 250 × 294 mm and the lower clear area forms with smaller dimensions of z. B. 220 × 264 mm from the preferably circumferential overlap or coupling region of about 14 mm, which encloses the average clear or direct light area.

In a preferred embodiment of a circularly formed cover disk having a diameter of 400 mm, the upper clear area comprises about 50% of the total area and the lower clear areas 37-40% of the total area, the ratio of the upper clear area to our clear areas being in the range of 1.2 to 1.5, preferably 1.33. Of course, these are only adapted to the application dimensions, which may be different for other applications and other.

In the preferred embodiment of the cover as a circular disc, this has a diameter of z. B. 400 mm, at the z. B. an LED module with dimensions of 250 × 294 mm and arranged in front of the LEDs collimator lenses is used, which have a total height of only 15 mm.

The invention thus realizes a light guide designed for center irradiation, that is to say for irradiation via the plane defined by the light guide, whereas the prior art requires edge irradiation, that is, coupling the light over the peripheral edge of the light guide.

A preferred embodiment of the invention is illustrated by way of example and not limitation in the drawings and will be described in more detail below.

However, it is also within the scope of the invention, the cover or the lamp without forming the direct area, but this is technically more efficient lighting with a direct or clear area at least on the top to improve the coupling, which means that it is also an embodiment possible is, which is provided on the bottom consistently without direct area with the coating. The illustrations in the figures are essentially to scale. To illustrate details, however, certain areas may be shown exaggeratedly large for those skilled in the art. In addition, the drawings may be simplistically simplified and do not include every detail that may be present in the practice.

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology such as "top", "bottom", "front", "back", "front", "rear", etc. is used with respect to the orientation of the described figure (s). Because components of embodiments can be positioned in a number of different orientations, the directional terminology is illustrative and is in no way limiting. It should be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description is not to be construed in a limiting sense. As used herein, the terms "connected," "connected," and "integrated" are used to describe both a direct and indirect connection, a direct or indirect connection, and a direct or indirect integration. In the figures, identical or similar elements are provided with identical reference numerals, as far as this is expedient.

Show it:

1 a view from below of a lamp cover according to the invention;

2 a view of the lamp cover according to 1 from above;

3 a longitudinal section of a lamp with the lamp cover according to the invention; and

4 an enlarged view of the lamp according to 3 from below, ie in the direction of radiation of the light.

Identical or equivalent parts are provided with the same reference numerals.

Accordingly, in its entirety by the reference numeral 2 characterized luminaire cover of a circular glass pane 4 on her in 1 visible underside a hatched indicated diffuser coating 6 and on the top an impurity surface 8th having.

The diffuser coating 6 on the bottom and the impurity area 8th on the top circumferentially enclose a middle, in this case rectangular trained open space 10 with dimensions of 275 × 235 mm on the top and dimensions of 240 × 200 mm on the bottom. Due to the aligned in the radiation direction free surfaces, so no impurities on the top and without diffuser coating 6 on the bottom is thus a centrally located, rectangular clearing area 10 formed for the direct passage of light, which is the size of a rectangular LED module 12 equivalent. According to the invention, the two clear surfaces in the radiation direction are coaxial with the luminaire cover 2 arranged to form the clear areas serving as direct light area.

Due to the dimensionally larger design of the upper clear area on the upper side in relation to the clear area on the bottom one becomes the clear areas 10 circumferentially enclosing coupling edge 14 formed, which corresponds to the geometry of the clearing area and is thus adapted to the geometry of the bulb. In the present case, this coupling edge has a width of approximately 14 mm.

Like from the 3 and 4 can be seen, the light cover is used 2 for covering a correspondingly formed light exit opening.

That in the 3 illustrated modular light housing 16 basically comprises two housing parts, namely a lower plate-shaped plate housing in the installed position 18 in that on its underside a light exit plane preferably extending horizontally in installation position is defined and can be inserted into an installation opening of a ceiling, and an upper housing part extending at right angles to the light exit plane, which in the present case is substantially cylindrical and insofar as a cylinder housing 20 referred to as. This cylinder housing 20 serves to accommodate a control gear 22 and provides at the front-side upper end the connection to the supply voltage by means of a developed and releasably attachable terminal 24 ready at 90 ° angle.

The top of the plate housing 18 is presently designed as a heat sink comprising a plurality of annular around the central mounting region for the cylinder housing 20 arranged cooling fins that alternate as larger cooling fins 26 and smaller cooling fins 30 are formed.

The modular design of the luminaire housing 16 comprising the lower plate housing in the installation position 18 and the cylinder housing disposed thereon 20 But it also makes it possible to arrange these two housing parts separately, so the plate housing 18 as a recessed light in a ceiling opening use and that cylinder housing 20 then separated from the plate housing 18 to integrate into the suspended ceiling.

Furthermore, the cylinder housing at its upper end preferably on three eyelets, with which the lamp can also be used as a pendant lamp.

The luminaire housing 16 is so far designed to make do with as little space in the region of the plate housing, which has a maximum height of 20 mm.

The plate housing 18 forms the actual luminaire housing with a circular receiving space at the lower end, in which the LED module 12 is inserted in the middle. In front of this LED module 12 is arranged a disc-shaped optics, in which each LED on the LED module 12 a corresponding collimator lens is associated in the radiation direction of the light.

The light cover 2 is over a total of four, each offset by 90 ° on a circular ring to each other arranged sealed cup screws 30 according to protection class detachable and thus revisable with the plate housing 18 connected. Between the light cover 2 and the luminaire housing 16 is a circular elastic seal 32 with which the annular gap between the outer peripheral edge of the lamp cover 2 and the inside of the plate case 18 is sealed to meet the desired degree of protection. This provides a frameless but revisable luminaire cover to fulfill all types of protection.

The subject matter of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with one another. All the information and features contained in the documents, including the abstract, in particular the spatial formation shown in the drawings are claimed as essential to the invention, as far as they are new individually or in combination over the prior art.

LIST OF REFERENCE NUMBERS

2

light cover

4

pane

6

diffuser coating

8th

Störstellenfläche

10

clear area

12

LED module

14

Einkopplungsrand

16

luminaire housing

18

stop housing

20

cylinder housing

22

control gear

24

terminal

26

big cooling rib

28

small cooling rib

30

plate screw

32

poetry

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• DIN 40050 [0018]
• DIN EN 60529 [0018]

Claims (10)

Translucent, planar body, in particular lighting cover, in particular usable as a light cover for a light exit opening of a luminaire, comprising a arranged in the beam direction in front of a light-transmitting translucent, preferably flat trained surface element to form a light exit surface, which a light bulbs in installation position facing top and one of the underside facing away from the light source, this having a direct light region designed for unbroken passage of a radiated light from the light source and an impurity region with an impurity structure for reflecting the light, characterized in that an impurity region is provided on the top, that the top next to the impurity region an upper clearing area ( 10 ) without impurity structure, that the underside has a coating region with a coating which produces a diffuse light, that the upper ( 10 ) and the lower clear region are formed corresponding to each other and disposed on the upper and lower surfaces, and that the coating region overlaps the impurity region to form an overlap region. A lighting cover according to claim 1, characterized in that the lower side next to the coating area has a lower clear area without coating, that the upper ( 10 ) and the lower clear area are arranged corresponding to each other, and that the coating area overlaps the impurity area to form an overlap area. A lighting cover according to claim 1 or 2, characterized in that the overlapping area corresponds to the upper ( 10 ) and the lower clear area encloses circumferentially. Photometric cover according to Claims 1 to 3, characterized in that the upper clear area ( 10 ) and the lower clear area are located in the middle of the cover. A lighting cover according to claims 1 to 4, characterized in that the clear areas ( 10 ) substantially correspond to the dimensions of the bulb. A lighting cover according to any one of the preceding claims, characterized in that the upper clear area is about 50% of the surface of the cover. A lighting cover according to any one of claims 2 to 6, characterized in that the lower clear area is about 35 to 40% of the surface of the cover. Photometric cover according to one of the preceding claims, characterized in that it is used as a glass pane ( 4 ) is trained. Photometric cover according to claim 8, characterized in that the glass pane ( 4 ) has a material thickness of about 3 to 4 mm. Luminaire with a luminaire housing comprising a luminous means, an optics associated with the luminous means and a lighting cover according to one of claims 1 to 9.

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