DE10353644A1 - Luminaire with a anti-glare body - Google Patents

Abstract

The device has a light source (1) and an associated reflector (3) with a light outlet opening for a direct light component. The source is enclosed on both sides by a light deflecting device, especially a light deflecting body, extending between the light source and reflector with one side in the direct light radiation direction relative to the source. The device is transparent at least on a side facing the reflector with a light diffracting structure on this side that influences the path of the light from the source incident on the reflector.

Description

The present invention relates to a luminaire having a lamp, in particular an elongated lamp, and a reflector associated with the lamp having a light exit opening for emitting a direct light component. Such lights are used in particular for interior lighting. In the interior lighting there is a requirement that the glare of people who are in the lighted room should be largely avoided. Corresponding requirements are specified in relevant standards, for example DIN EN 12464-1 or E DIN 5035-7. In particular, in luminaires for VDU workstations there is a requirement that in certain C-planes above a shielding angle, which is typically in a range of 45 ° to 80 °, often in the range of 50 ° to 65 °, in particular 65 °, the luminance below a Value of 1000 cd / m ² , according to older standards or draft standards even below 500 cd / m ² or 200 cd / m ² must be. Conventionally, compliance with such conditions is achieved by inserting a grid in the light exit opening, which has fins or similar elements that limit the exit angle of the light geometrically. For avoiding glare, however, not only those light beams are relevant which run directly from the lamp through the grid without reflection. Rather, reflections on the grid or in the reflector of the lamp can lead to glare. The requirement to avoid even glare by reflection has led to partially complex lamellar constructions. Conventional grids whose elements are made of opaque materials also reduce the efficiency of the luminaire. Approaches for grids with translucent materials have not prevailed in practice.

One Another approach to avoid glare is the principle of the secondary light. The light of the lamp does not become instantaneous with corresponding lamps, but only after reflection about delivered a reflector. Therefor are usually a spaced from the lamp secondary reflector and a primary reflector required, which surrounds the lamp so far, the light of the lamp not directly from the light exit opening of the secondary reflector at an angle greater than can escape the shield. With different secondary lights is about it out on the secondary reflector facing side of the lamp provided a grid, which, similar to a grid with a direct luminaire, the light emission from the lamp to the secondary reflector check. Such constructions often lead to multiple Reflections to the emission of light through the light exit opening required are that reduce the efficiency.

It The object of the invention is an alternative luminaire construction to disposal to make, with which in particular those for the interior lighting required shielding can be achieved.

According to the invention this Task solved by a lamp, in particular an interior light, with at least a light source, for. B. a lamp, in particular an elongated Lamp, and a light source associated with the reflector of the light source emitted light reflects and a light exit opening for Having a direct light component, characterized in that that the Lamp at least two, preferably three sides by a light-guiding Device, in particular a light-directing body, surrounded, which itself at least on one side between the light source and the reflector extends and has a side which, with respect to the light source on the side is at which the delivery of the direct proportion of light takes place, wherein the device at least at one, in particular at all to the reflector facing sides is translucent and these translucent pages has a refractive structure, which the beam path of the influenced by the light source on the reflector incident light.

Under a direct light component of a luminaire is in this context to understand that proportion of light of a lamp without prior Reflection emitted to a room element on the surface to be illuminated becomes, what does not exclude that certain Proportions of the direct light component before the radiation through the corresponding light exit opening reflected in the luminaire.

According to a particular embodiment, the luminaire is designed so that in one or more C-planes, in particular in the C90 and the C 180 plane, above a shielding angle to the vertical in a range of 45 ° to 80 °, preferably in a range of 50 ° to 65 ° and in particular at 65 °, the luminance is below a value of 1000 cd / m ² , optionally also below 500 cd / m ² or 200 cd / m ² , in particular such that the luminaire the standards mentioned above or draft standards. It may be provided in particular that in the area below the Abschirmwin cle the luminance of the lamp is at least predominantly, preferably completely above 1000 cd / m ² .

According to the invention, the light-directing device has a side which lies with respect to the lamp in the direction of the emission of the direct light component. Is the lamp inside the reflector on ordered, it lies on the light exit opening facing side of the lamp. If the lamp is arranged wholly or partially outside the reflector, it lies on the side facing away from the reflector and the light exit opening side of the lamp. In both cases, this side is arranged so that light of the lamp, which is emitted in the direction of the direct light component, is incident on this side of the light-directing device.

The Light-directing device can on the in the emission of the direct light component lying side translucent, partially translucent or opaque be. In particular, over this page according to a embodiment the invention, a direct amount of light are emitted, while according to others Embodiments about these Page no light is emitted and the lamp overall similar to a secondary light acts. Also in this regard, hybrids are possible, such as such that light only partially let through, so that the area of this page Although it appears bright, but with a lower luminance as the remaining area of the light exit opening.

The Light-directing device does not have according to the invention necessarily exclusively consist of light-directing and / or translucent elements, but may also have one or more elements and sections which have no light-directing properties or are not translucent.

According to one embodiment the invention can be provided that the reflector the lamp completely or partially surrounds and in particular the lamp is not or only partially beyond the light exit opening of the reflector. in principle but it is also possible that the Lamp outside the reflector is arranged and the light-directing device arranged so that that over them emitted light of the lamp at least partially, but preference as Completely is irradiated on the reflector. Such embodiments come especially into consideration when the reflector relative should be flat.

In cases in which the lamp is outside of the reflector, it can be provided that the body is not or only partially translucent arched or otherwise the lamp has concave bottom and a translucent element, in particular a translucent Roof with a refractive structure, placed on one side so that the Soil and this element together form the body in its interior the lamp is picked up. In particular, it can be provided that the element the shape of a flat roof, an outwardly or inwardly arched roof or a roof, which, in a cross-section perpendicular to the lamp axis, which has the shape of a polygon, which with respect to the Lamp can be concave or convex.

The Invention may provide that the light directing device, in particular a light directing body, the Lamp on two opposite ones Surrounds, of which, however, only one side is translucent, so that light over this Side can be irradiated to the reflector. The other, opposite Side can be absorbent, but preferably designed to be reflective be so that they the light incident on them to the opposite side of the light directing Institution reflected, so that the Luminous efficacy increased becomes. In this way can be easily achieve an asymmetrical radiation characteristic of the luminaire. However, the invention can also provide that the two opposing Pages each translucent so that over both Side light on the lamp is irradiated to the reflector, taking these two sides in particular also symmetrical to each other could be, so that, in conjunction with a symmetrical reflector, a symmetrical Light emission characteristic arises. Mixed forms are also included possible, such that a asymmetric light-directing device, in particular an asymmetric device light-directing body, combined with a symmetrical reflector or an asymmetric one Reflector with a symmetrical lichtlenkendne device.

The Invention can also provide that the light directing device, in particular a light-directing body, symmetrical with respect to a Level is what the longitudinal axis the lamp contains and the light exit opening for the direct light component cuts. It may be provided in particular that these Level the light exit opening for the direct light component cuts at a right angle.

The In particular, a luminaire can be an elongated luminaire with an elongated luminaire Lamp be in the direction of the longitudinal extension of the lamp is aligned, wherein the lamp is substantially parallel to the Light-emitting surface, that is, in particular, not perpendicular to the light exit surface.

Of the Reflector can except the mentioned light exit opening more Have light exit openings, in particular one or more light exit openings for emitting an indirect light component.

The invention may provide that the light-directing device with respect to the lamp in the direction of emission of the direct light component lying floor, z. B. one of the light exit side turned floor, and has walls angled to this floor.

Of the Ground can be flat or curved be composed of several even or curved sections be. For example, the floor may consist of two flat sections exist, on the lamp side facing an angle of 135 ° to 155 °, in particular 140 ° with each other lock in and with the side walls each enclose an angle of 90 °.

Of the Floor and / or the side walls can each be just trained. However, floor and / or side walls may also different forms, e.g. have a V-shape.

The Invention may provide that the light-directing device comprises a body, in cross-section, in particular in a cross-section perpendicular to one substantially parallel or weak inclined to the light exit surface extending lamp axis, the shape of a cut off at the top, own open-top triangle.

there can also be provided that in a cross section, in particular in a cross section perpendicular to a substantially parallel or slightly inclined to the light exit surface extending Lamp axis, the line connecting the two endpoints of the soil, with a tangent to a side wall, preferably with the tangents on all side walls, which passes through one of the endpoints, an angle of 65 ° to 80 °, in particular 70 ° includes. at corresponds to flat side walls this angle is the angle between the line through the two endpoints and the relevant side wall.

The Invention may also provide that this angle is greater than 90 °, in particular 150 ° to 160 °. This especially in conjunction with line-shaped prisms with a triangular Cross section may be provided, which is connected to one or more, in particular all sidewalls longitudinal extend the lamp and in cross section a point angle in a range of 85 ° to 130 °, in particular 90 ° or 116 °.

The Invention may also provide that on each side of the floor several adjoining ones side walls are provided, according to a embodiment a floor immediately adjacent the first side wall with the Soil at an obtuse angle and between the ground and another, second side wall which is adjacent to this first Sidewall connects and with this first sidewall a blunt or acute angle includes. In this embodiment may be provided in particular that the first side wall line-shaped prisms having a triangular cross section, preferably longitudinal extend the lamp, have a triangular cross-section and a point angle in the range of 90 ° or a range near 90 °, z. B. 85 ° to 100 °, have, these prisms are directed towards the interior of the body, while the second side wall linear Prisms having a triangular cross section, preferably longitudinal extend the lamp, and in cross section a point angle with a Value of 90 ° or in a range around 90 °, z. B. 85 ° to 100 °, have, the prisms of this second sidewall being on the outside of the body.

The invention can provide that the refractive structure in a cross section, in particular in a cross section perpendicular to a substantially parallel or slightly inclined to the light exit surface extending lamp axis, the light emission limited such that the majority of the light on the reflector side facing in a range of angles is limited below a critical angle β to a perpendicular to the side wall. According to one embodiment of the invention, it can be provided that this restriction is such that above this critical angle only such small amounts of light are emitted that they are perceived below the viewing angles, under which they are perceived by the viewer, to a luminance of less than 1000 cd / m ² lead. However, the invention can also provide that outside the range below the critical angle β further light components are delivered, which are smaller or substantially smaller than the above-mentioned predominant light component, the side wall is then oriented so that such light components, as far as they are in a region above the shielding angle in a plane in which a shield is required to be radiated immediately, resulting in a luminance above the threshold of the shielding condition, being emitted in a direction related to the observer, in which shielding is not required (For example, in a range of angles below the angle to the vertical relative to the vertical or to a ceiling or wall for the purpose of indirect lighting) and / or these light components are irradiated to the reflector or other optical elements of the lamp that this either only in one form over the Lichtaustri be discharged, which corresponds to the shielding conditions.

It can be provided that at each light exit point of the side wall of the angle β is determined by the refractive structure, that light rays exiting at the angle β from the side wall, not by the said Lichtaus running surface.

Especially can be provided that all Light rays emerging from the sidewall at angle β, on the reflector and / or on other light exit surfaces than the said light exit surface for one incident light emission, e.g. on light emission surfaces for indirect light components.

According to one preferred embodiment the side walls the translucent Body opposite the in terms of the lamp in the direction of the radiation of the direct light component lying side, z. B. opposite one to the light exit opening skilful base, angled. The angle that these side walls with to include the base page, is chosen that this Light substantially to the reflector (possibly also to a second light exit opening) is directed. More precisely, each line cuts the reflector, which with the surface normal of these side walls a smaller angle than the limit angle β generated by the prisms, which, based on a perpendicular to the side wall, also a shield angle in the sense of a luminance limit above the limiting angle can be with the aforementioned limits. In one embodiment The invention can be provided that the angle to the vertical or to a perpendicular to the light exit opening, the preceding mentioned Limit angle β corresponds to the same the geometric defined by the reflector and the lamp Shield angle or larger than this is, with this geometric shield angle being the largest angle is defined to the vertical or to a vertical to the light exit opening, under which a beam of light from the lamp (without the said light-directing Device) can emerge without being reflected by the reflector to become. in principle can However, other constellations may be provided in which the refractive structure, in particular the prisms of the light directing Device and the shape of the reflector so coordinated are that one Shielding is generated.

The Invention may provide that the refractive structure of linear, preferably parallel Consists of elements in a cross-section perpendicular to the line, which follows the element, have a constant cross-section.

The said line may in particular be straight and parallel to the Luminaire longitudinal axis and / or parallel to the lamp axis.

It can be provided that the Elements have a cross-section tapering from one base to two Have sides that connect to the base, where the sum of the angles, which the tangents to the two sides, which through the endpoints Run the base, with the base side in a range of 50 ° to 95 °, in particular at 90 ° or 64 °, lies. This cross-section can in particular be perpendicular to a bisector to be symmetrical to the ground plane.

It can be provided that the Cross section has a triangular shape. It can be provided in particular be that the the base opposite Angle is 90 °.

According to the invention, a Means be provided, which light, which from the lamp in the emission direction of the direct light component of the lamp, in particular with an arrangement of the lamp inside the luminaire, in the direction to the light exit opening for one direct light component is emitted, not or only partially passes.

there can be provided that the Bottom of the body opaque is or partially translucent is or that between the lamp and the floor an element is provided, which light not or only partially.

there can be provided that a reflective or partially reflective and partially translucent element is arranged between the floor and the lamp.

This Element is preferably placed on the ground and may e.g. in the body be inserted or glued to the ground. In particular, that can Element is a mirror, e.g. made of aluminum, that is towards the bottom of the body radiated light of the lamp reflected back. According to one embodiment The mirror is thereby formed in a form which is a back reflection prevents the lamp, e.g. in the form of an involute.

According to others embodiments follows the mirror or, more generally, the at least partially reflective Element of the contour of the soil and z. B. just be.

alternative The floor may be covered with an opaque or partially translucent coating be provided, in particular directed, undirected or partially can be directionally reflective. Such in whole or in part reflective coating can e.g. applied by steaming become. According to others embodiments the floor can also be complete from a reflective, in particular directionally reflective material consist.

According to one embodiment, the light exit opening facing side of the body provided with a reflective coating, so that the body acts on this side as a primary reflector. The light exits through the side walls of the body, and then falls on the reflector of the lamp, which reflects it to one or more light exit openings. On the one hand, this can be the already mentioned light exit opening for emitting a direct light component. However, the reflector can also be provided with a second light exit opening or, moreover, further light exit openings for emitting an indirect light component. According to certain embodiments of the invention, the light emerging from the body can either emerge directly through such light exit openings for the delivery of an indirect light component or after reflection in the reflector. In principle, it is also possible to think of providing an opening in the reflector or in the housing above an open side of the body facing away from the light exit opening for the direct light exit, so that light can emerge directly from the interior of the body for emitting an indirect light component. Such an embodiment would be considered especially if, as is often the case, the indirect light component is not subject to any screening restrictions.

The Invention may provide that a Element is arranged between the floor and the lamp, which has a refractive structure, the light is not or only partly to the ground or through transmitted light on an angular range to a lower right to the light exit surface, preferably to a range of angles below the shielding angle concentrated.

For example For example, the element may comprise prisms, which are light, in particular perpendicular incident light, reflect back (Cat's eye effect).

Especially For example, the element may have a structure of line-shaped prisms which in a preferred embodiment a cross section with a point angle in a range of 85 ° to 130 °, in particular 90 ° or 116 °.

In a modification of this embodiment can be provided that the Floor itself has a corresponding refractive structure, in addition another element having a refractive structure as above described, can be used to alleviate the weakening, prevention or concentrating on certain areas of space through the floor to improve or allow light passing through. In particular, the soil on its outside line-shaped prisms with a cross section in the form of a triangle with a point angle from 116 ° and the element is linear Prisms with a cross section in the shape of a triangle with a point angle of 90 °, preferably parallel to one another, in particular in the direction of longitudinal axis or the center line of the lamp. According to various embodiments of the invention the prisms of the element may either face the ground or be turned away from this. This leads to a wide-beam or deep-radiating characteristic of passing through the element Light. Due to the orientation of the prisms can thus that area of the body, on which the light passing through the element is incident varies be, what further design options the generation of a desired Light intensity distribution curve the entire lamp opens. According to the currently preferred embodiments the prisms provided at the bottom with a triangular cross-section and a point angle of 116 ° of the lamp turned away and have accordingly, based on the Direction of the light exit opening for the direct light component escaping light, to the outside.

In an alternative embodiment can be provided that the Ground on its outside or inside linear Prisms with a cross section in the shape of a triangle with a point angle from 116 ° and the said element also has line-shaped prisms with a cross-section in the form of a triangle with a point angle of 116 °, in this embodiment the longitudinal axes the linear Prisms of the soil and the element are not parallel to each other and in particular can include an angle of 90 ° to each other.

The Invention may provide that the bottom of the body a film glued with a corresponding refractive structure or otherwise applied.

The Invention may provide that the light-directing device comprises a light-directing body, the bottom of one piece with the side walls is trained.

These embodiment is particularly advantageous when the body is made of a translucent material exists, since even if an immediate light leakage over the Ground is prevented by light conduction within the body comparatively small amount of light is emitted via the ground, so he across from the light exit opening is brightened and the light / dark transition between the body, the the viewer sees in the light exit opening, and the remaining light exit opening is mitigated becomes.

It can be provided that the side edge of the bottom and the side walls is provided in each case with a chamfer, which only ei over NEN part of the thickness extends, so that the bottom and side walls are connected by a material portion, wherein the bevels abut each other after a miter.

This allows the body made of a flat material that is at the boundaries between sections, the the floor or the side walls to form, has a notch to fold and thereby in particularly easy to produce.

It can also be provided that this notch formed on the same side of the starting material as the refractive structures. This allows a particularly simple Production, since then structured the starting material only on one side must become. Unless the refractive structures are on the outside of the finished body should be able to possibly additional Elements of the body or the lamp, such as retaining clips, guide devices or the like, which the side walls opposite to Keep floor in place. It can also be provided, for example be that the Notch, which in this case lies on the outside of the body, is filled with a suitable material. For example, you could eject the area of the notch or else a bar or insert another element into this notch and there, z. B. by gluing, fix. In this way, the Location of the side walls be stabilized. Depending on your needs, the inserted material the same or similar optical properties like the body or not.

The Invention may provide that a or more sidewalls and / or the floor means for positively holding one or more plate-shaped or foil-shaped Having elements with a refractive structure.

at this embodiment is the body from several parts, namely from a basic body, which is preferably unstructured, and plates or sheet-like elements with the refractive structure. In a particular embodiment if the device consists of grooves between which the elements are guided, so that you can be plugged in a simple manner.

In a modification of this embodiment can also be provided that the side walls and the floor are separate parts. According to an embodiment then the sidewalls become glued to the floor. According to an alternative embodiment be the side walls in inserted corresponding recesses in the ground, where they be secured by a snap or clamp connection or otherwise can.

at embodiments with a multi-part body It is advantageous if the floor is made of a translucent material consists of the light / dark transitions between the bottom and the rest of the light exit opening, which were explained above, mitigate. The transfer of light from the side walls into the soil can be achieved by using an adhesive with a similar refractive index like that of the floor and the sidewalls, more general through that Fill out of spaces between side walls and soil with a material with a similar refractive index as that of the bottom and side walls, be improved.

The Material of the light-directing body or the elements of the light-directing device can in particular a Plastic, e.g. Polymethyl methacrylate (PMMA), polystyrene (PS), a Styrene-acrylonitrile copolymer (SAN) or polycarbonate (PC), wherein the plastic is preferably extrudable, or glass, e.g. BK7, be.

The In particular, the invention also provides a method of manufacturing a light-directing body for use with a luminaire as described above was available, in which in a flat material (preferably two) the later side walls corresponding sections and an intervening section corresponding to the ground be set, and then the side sections opposite the Floor section are set up.

there can be provided in particular that at the border between the Area of the side surfaces and the area of the bottom, the thickness of the material is lower, to facilitate the bending.

Especially can be provided in this area indentations with inclined surfaces, which after setting up the side walls represent a miter between the side walls and the bottom part.

As already mentioned above, can in an alternative embodiment Such notches should also be provided on the side which after setting up the side walls on the outside lies. This in particular has an advantage when the outside the side walls should be structured.

The invention also provides a method of manufacturing a photoconductive body for use in a luminaire as described above, in which a one-piece Body with a bottom surface and two angled thereto side surfaces, preferably by extrusion, is produced and then sheet-like elements, in particular plates or films having a refractive structure, in particular a structure of line-shaped parallel prisms, particularly preferably a structure of parallel linienfömigen prisms with a triangular Cross-section, be attached to the side walls and / or at the bottom.

there the invention may provide that the elements with the refractive structure on the side surfaces and / or on the bottom surface of the Body glued on become.

According to one another embodiment may be provided that the body a guide for the sheet-like elements having the refractive structure and inserted into the guide so they there form-fitting being held.

alternative can be provided that these sheet-like elements otherwise, e.g. by clamping connections, latching connections, or the like on a body being held.

The The invention further provides a method for producing a light directing body for use with a luminaire as described above was available, at which the body has a bottom element and has separate side walls thereof, wherein the bottom element one or more receptacles for receiving the side walls and one or more side walls are inserted into such receptacles. In particular, can the receptacles have the shape of a groove, in which the side walls are inserted become. The recording can with a security device, in particular a locking connection, be provided, which the side walls in the receiving device latched, jammed or otherwise secured.

at This manufacturing process, the side walls and / or the floor before refitting with a refractive index Structure provided outside wall exhibit. You can but in this assembly also be unstructured, in which case, As described above, sheet-like elements comprising the required refractive structure, on the side walls and / or be attached to the ground, in particular by gluing, by Inserting in guide grooves or similar.

If the refractive structure formed in a separate element is that to the actual body attached in the manner described above, it is advantageous that this element is attached so that the Structure to the side wall or the floor to which the element attached is, points, so that the finished bodies after Outside a smooth surface has and the refractive structure in the space between the Elements and the actual body lies, so that she protected against contamination is. The elements are preferably inside the actual Body.

The Invention will now be described with reference to embodiments with reference on the attached Drawings closer explained.

1 shows a first embodiment of a lamp according to the invention,

2 shows an enlarged detail view of the lamp according to 1 .

3a and 3b illustrate the radiation behavior of a horizontal prism plate, as used in the invention,

4a and 4b illustrate the radiation behavior of a tilted prism plate, as used in the invention,

5 illustrates the radiation behavior of a luminaire according to 1 .

6 shows the radiation behavior of a modification of the luminaire 1 with direct and indirect light emission.

7 illustrates another embodiment of the invention,

8th illustrates another embodiment of a light directing body that can be used in accordance with the invention,

9a and 9b illustrate a first manufacturing method for a light directing body according to the invention,

10 illustrates a second manufacturing method for a light directing body used in the invention,

11 illustrates a third manufacturing method for a light-directing body used in the invention.

12 illustrates another embodiment of a light directing body.

In the 1 as an embodiment of the invention shown lamp has a rod-shaped elongated lamp 1 and an elongated reflector 3 on, in which the lamp 1 is received and whose longitudinal axis is parallel to the lamp axis. The reflector 3 has a light exit opening 5 on. On the side opposite the light exit opening side of the reflector 3 is a bird-swinging roof reflector 7 provided that over a step 8th to the reflector 5 followed. The reflector 3 and the roof reflector 7 are designed in such a way that the light to the center plane, the in 1 S is symmetrical. The entire reflector construction therefore consists of two mutually symmetrical halves, which in the center plane S at an angle to each other and an edge 9 form. The reflector construction can consist of a part which is constructed in the manner described above. However, it can also consist of several parts. The roof reflector 7 For example, but need not necessarily be a separate part, which is in an opening of the reflector 5 is used.

The lamp surrounds a light-directing body 10 , the two straight sidewalls 12 and a straight floor 14 has, which is substantially parallel to the light exit opening 5 is. The side walls 12 connect with the median plane S an angle α, which is preferably 20 °. Accordingly, close the side walls 12 with the ground 14 each an angle of 70 °. Overall, the body has 10 in cross-section the shape of a truncated triangle at the top. The side walls 12 extend in the direction away from the light exit opening to the roof reflector 7 , How to get in the 1 can recognize and in 2 shown enlarged, is the side walls 12 at the stage 8th between the reflector 3 and the roof reflector 7 on, so that there is no gap through which on the walls 12 passing light on the reflector 3 can come up. As in 1 and 2 It can be seen that the side walls are 12 and the ground 14 provided on its outer side with line-shaped prisms, which follow parallel lines which extend parallel to the longitudinal axis of the lamp and, accordingly, perpendicular to the plane of the drawing 1 respectively. 2 stand. In a cross section perpendicular to the longitudinal axis of the luminaire, these prisms have a triangular cross section, the angle at the top of the prisms, in 2 denoted by γ, is 90 °.

The floor 14 as well as the area of the transition from the ground 14 to the side walls 12 is on the lamp 1 facing side with a mirror element 20 covered, which reflects back the light incident on this area and an immediate passage of light through the floor 14 prevented. The mirror element 20 may for example consist of aluminum or other high gloss material and may be in particular a pickled component. However, it can also be a foil, with which the inside of the body 10 lined in the appropriate area. Alternatively, one could also provide a coating, for example by vapor deposition. As material for the mirror element 20 come usual high gloss materials into consideration. Particular preference is given to the materials MIRO and MIRO SILVER from Alanod or the material VISIBLE MIRROR from 3M, which have a reflectance of 94% or more.

The mode of action of the prisms on the side walls 12 is out 3a and 3b respectively. 4a and 4b seen. 3a schematically shows the horizontal arrangement of a corresponding prism plate with a lamp arranged above. The luminous intensity distribution curve of 3b shows that the emitted light is emitted substantially to a range of 45 ° to the vertical. The corresponding region of the luminous intensity distribution curve is designated A. The angle to a perpendicular to the plate defining the region A is denoted by β. In the presentation of 3b and the corresponding representation of the 4b will the in 3a respectively. 4a considered arrangement as idealized point light source, which lies in the center of the coordinate system. The angle β thus corresponds to the angle of a straight line which passes through the center of the coordinate system and touches the edge of the region A, to the perpendicular to the plate. Above 45 °, in particular in the areas designated B, only light components are emitted, which are relatively small in comparison to the light component A. However, small amounts of light can be essential for the glare, as in the luminance, which is used for the assessment of the glare properties of a lamp, the cosine of the viewing angle inversely proportional, so that even small light intensities at large angles close to 90 ° lead to glare could. 3a shows the same prism plate, but now oriented to include an angle of 15 ° with the vertical. In accordance with the tilting of this prism plate, the luminous intensity distribution curve also tilts such that the predominant part of the light emission is emitted above an angle β ', in the illustrated example in a range of 60 ° to 150 ° to the vertical. The light components B, which could possibly lead to glare, are now no longer in a range near 90 °, as in the arrangement of 2a but on the one hand in a range between 0 ° and 60 ° on the one hand and on the other hand in a range of approximately 180 °. Both angular ranges are not relevant for the glare limitation.

According to the in 1 illustrated embodiment is now the angle α, ie the angle to Vertical to the side walls 12 are inclined to the vertical, chosen so that the light component A corresponding light on the reflector 3 incident or at least not directly emitted via the light exit opening for the direct light component. In particular, the angle α may be chosen so that a proportion of light A corresponding light component which emerges at a point of a side wall, which is closest to the light exit opening for the direct light exit is limited by a straight line through this point, which intersects the reflector or at least touched.

In this embodiment, the light emission of the light component A takes place on the reflector 3 so that these light components can not directly, ie by light emission without prior reflection, lead to glare, while the secondary light components B are emitted either in the unshielded area below φ in which the glare is not critical, or vertically upwards in Direction to the reflector 3 be delivered.

By the construction according to 1 is characterized by the fact that on the one hand an immediate passage of light through the ground 14 prevented and on the other hand provided with prisms side walls 12 are inclined at an angle α to the center plane S, a complete glare of the lamp achieved, as was otherwise achieved by a light grid. 5 schematically shows the beam diagram of the luminaire according to 1 , It can be seen that the light which is emitted via the side walls, almost completely to the reflector 3 is reflected, and from the ground 14 no light comes out. It has been shown that a light with the construction of the 1 not only in the longitudinal and transverse direction, but also in diagonal levels is blinding. Currently, it is believed that the glare dissipation in the transverse direction by the interaction of the prisms and the reflector, while the glare in the longitudinal direction is at least mainly caused by the prisms on the side walls.

Because of the body 10 consists of one piece and the side walls 12 and the ground 14 pass directly into each other, it is achieved that the soil 14 despite the mirror element 20 does not appear completely dark because of light conduction in the body 10 a small portion of the on the sidewalls 12 incident light in the body 10 to the ground 14 is directed and there in the direction of the light exit surface 5 exit.

To improve the efficiency, it is advantageous to the roof reflector 7 and the mirror element 20 in such a way that a total reflection in the side walls or, if separate prism sheets or foils are attached to the side walls are avoided in these prism sheets or foils. In this case, in the presented embodiment, at least the predominant part of the rays reflected by the roof reflector or the mirror element should have an angle of incidence with respect to the perpendicular to the side wall of less than 60 °.

At the in 1 As shown embodiment, it would not be necessary in and of itself that the soil 14 , as in 1 shown on its outside with the line-shaped prisms is provided with a triangular cross-section. However, manufacturing technology often makes it easier to provide the whole body with prisms on the outside. The prisms on the outside of the soil 14 however, may be of importance if, in a modification of the embodiment, the mirror element 20 not completely, but only partially reflective and partially translucent. In this case, there is some light guidance by the prisms and a concentration of the emitted luminous flux as shown in 3b in the form of area A, desired.

In a modified embodiment of the invention, the reflector has 3 on both sides of the light-conducting body 10 Openings for the exit of an indirect light component, which in 6 With 30 are designated. In 6 are the beam paths of the lamp over the body 10 radiated light. It can be seen in particular that through the openings 30 a light portion is emitted upward, while the roof reflector 7 an immediate exit of light from the body 10 in the to the light exit opening 5 opposite direction prevented. In this embodiment, the light components passing through the openings are subject 30 usually no glare limitation. Therefore, by suitable design of the prisms and / or a suitable choice of the angle α, the light components that could otherwise lead to glare can reach the openings 30 be directed. In particular, it can be provided that the region of a light component B or the region of the light component A with the region of the openings 30 partially overlapped or even, in the case of the lights B, coincides with these. In a modification of this embodiment, the roof reflector 7 to amplify the indirect light account.

In a modification, not shown, of the embodiment of the 1 can also be provided that the light-directing body, which in the embodiment of the 1 is open on the side facing the reflector, is closed on this side and on the side facing the reflector also a translucent wall with a refractive structure, such as a structure of parallel line-shaped prisms extending in the longitudinal direction of the luminaire. In this case, the body of the roof reflector 7 be spaced, so that the main light component of the radiated light over the body, which the light component A in 3b or 4b corresponds to the reflector 3 or the roof reflector 7 incident.

7 shows a modification of the embodiment of the 1 , in the same elements as in the embodiment of 1 are provided with the same reference numerals. In this embodiment substantially eliminates the mirror element 20 , Instead, there is a plate 40 from a translucent material to the floor 14 aufgelegt, which on its underside, which faces the floor, line-shaped parallel prisms having a dreiekkigen cross-section, with respect to a plane perpendicular to the longitudinal axis of the lamp, have, similar to the embodiment of the 1 for the side walls 12 was provided. The side walls 12 are as in the embodiment of 1 provided with line-shaped prisms with the cross-sectional shape of a right triangle. The lines showing the prisms of the plate 40 and the soil 14 are parallel to each other and to the longitudinal axis of the luminaire. The ground is against that 14 provided with line-shaped prisms, which in a cross-section perpendicular to the lamp axis in the form of a triangle with a point angle of 116 °, as shown in 7 is indicated. Side of the element 40 can reflector sections 42 be provided with which the transition area from the ground 14 to the side walls 12 is covered and prevents that exits uncontrollably in this edge region light.

In the embodiment of the 7 creates the plate 40 a concentration of the light portion to a range of ± 45 ° to the center plane S, as in 3a and 3b is shown. However, this is not completely sufficient for glare control with the shielding angle φ of 65 °. Therefore, in addition to the bottom, the prisms are provided with a point angle of 116 °, which the corresponding light components above the shielding angle φ, which could lead to glare, in particular those lights, which in 3b and 4b with B, suppress or divert to smaller angles. As a result, the light in the longitudinal and transverse directions, but preferably also be blended in several levels.

8th illustrates an alternative form of the body 10 in which the side walls 12 and their orientation to the median plane S have remained unchanged while the ground 50 from two sections running obliquely to the median plane 52a and 52b each having an angle of 70 ° with the median plane and an angle of 90 ° with the sidewalls, so that the sidewalls 12 in turn, still enclose an angle of 20 ° with the median plane.

The body 10 can be made in different ways. For example, the basic shape of the body can be manufactured in a known manner, in particular extruded or made by hot deformation of a plate. The prisms can for example be cut or glued. It is also possible to make the side walls and the floor as separate parts and to the whole body 10 glue together, between the bottom and side plates mitres for joining the parts are available.

An advantageous manufacturing method is in 9 illustrated. In this manufacturing process, sections are formed in a flat material 62a and 62b which should later correspond to the side walls and an intermediate section 64 fixed, which is later to correspond to the ground. Between these sections a longitudinal triangular notch is provided, but the parts 62a . 62b and 64 does not separate from each other, but this on a residual strength of the material, so to speak, via a film hinge connects. Subsequently, the side walls 62a and 62b as indicated by the arrows in 9a outlined to the form of 9b placed, the sides of the original notch are now in the manner of a miter to each other. To stabilize these edges can be glued together or other means for stabilizing the body can be provided in the lamp. In an alternative embodiment, not shown, the notches between the sections 62a . 62b and 64 be provided on the side on which the refractive structures of the side walls are formed and which in the finished body (see. 9b ) facing outward.

10 illustrates another way of making the body. In this type of manufacturing an open-topped trapezoidal profile is produced, for example by extrusion, the profile in the region of the side walls 72 at the upper and lower end grooves 74 has, in which plates or foils 76 which are used, preferably inserted, preferably inserted into the prism structure required for the side walls, ie the structure with the line-shaped parallel prisms which have a cross section in the form of a right-angled triangle. FIG. 10 furthermore shows the mirror element 20 shown again. This can be inserted or glued or coextruded and provided after extrusion with a reflective coating or lined with a reflective film. In a modification of the illustrated embodiment may instead of plates or foils provided with a prism structure or another refractive structure, also plates, foils or other elements are applied, which are reflective or at least partially reflective, in particular specularly reflective, in order to produce an asymmetrical light emission characteristic of the luminaire or another way to change the Lichtabstrahlcharakteristik

11 shows another way of assembling the body. In this embodiment, the body consists of separate side parts 80 and a separate bottom part 82 wherein the bottom part is a groove 84 for inserting the side parts 80 has. In this case, a latching connection is provided, which the side wall in the groove 84 latched (see. 10 , Reference number 86 ). It should be noted, however, that this illustration only schematically indicates a latching connection. In practical applications, for example, a separate detent groove for locking the side walls and locking with a latching tongue will provide.

12 illustrates another embodiment of a light-guiding body, in which connect to the ground on both sides in each case a plurality of side walls in the manner of a polygonal pull. Close closer to the ground 90 for example, like the ground 14 in the embodiment of the 1 or 7 may be formed, on both sides in each case first side walls 92 which have parallel lines to the longitudinal direction of the body and to the lamp axis extending line-shaped prisms having a cross-section perpendicular to the longitudinal axis of a triangular cross-section having a point angle of 90 °. How out 12 it can be seen that these prisms are directed towards the interior of the body. To the side walls 92 Close sidewalls 94 which likewise have line-shaped prisms extending in the longitudinal direction of the body or in the longitudinal direction of the lamp, which have a triangular cross-section, based on a cross-section perpendicular to the longitudinal axis of the body, which has a point angle of 90 °. Unlike the prisms of the sidewalls 92 have these prisms, as in 12 shown, outward. Depending on whether the prisms are directed inwards or outwards, they produce a different light emission characteristic of the light passing through them, which can be advantageously used for the design of the light intensity distribution.

A Lamp according to the invention may be in particular a screen workstation light. Further Luminaires in which the invention finds application, for example Recessed lights, surface-mounted lights, pendant lights, floor lamps and wall lights, without it the scope of the invention would be defined exhaustively.

numerous Variations and variations of the embodiments described above are within the scope of the invention possible. For example, you can the side walls have different refractive structures and / or different Have transmission properties. In principle, it is also conceivable that the refractive Properties or transmission properties within the sidewalls differ are. Likewise, it may be provided that one or optionally several side walls are reflective, this training may be such that these Side wall completely is reflective or that she is partially reflected and partially transmits light.

The in the description, the claims and The features of the invention disclosed in the drawings can be both individually as well as in any combination for a realization of the invention various embodiments be essential.

1

lamp

3

reflector

5

Light opening

7

top reflector

8th

step

9

edge

10

light directing body

12

Side wall

14

ground

20

mirror element

30

openings in the reflector

40

plate

42

reflector sections

50

ground

52a, 52b

floor sections

62a, 62b

sections in the material

64

section in the material

72

Side wall

74

groove

76

plate or foil

80

side panel

82

the bottom part

84

groove

90

ground

92

Side wall

94

Side wall

Claims (25)

Lamp with a light source ( 1 ) and a reflector associated with the light source ( 3 ) with a light exit opening ( 5 ) for emitting a direct light component of the luminaire, characterized in that the light source is guided on at least two sides by a light-directing device, in particular a light-directing body ( 10 ), which is located between the light source ( 1 ) and the reflector ( 3 ) and has a side which with respect to the light source ( 1 ) lies in the emission direction of the direct light component, the device at least at one to the reflector ( 3 ) pointing page ( 12 ; 72 . 76 ; 80 ) is translucent and on this translucent side has a refractive structure, which the beam path of the light source ( 1 ) on the reflector ( 3 ) of incident light. Luminaire according to claim 1, characterized in that the reflector ( 3 ) the light source ( 1 ) completely or at least partially surrounds. Luminaire according to Claim 1 or 2, characterized in that the light-directing device has a base (14) lying in the direction of emission of the direct light component with respect to the light source ( 14 ; 50 ; 82 ) and to this floor angled walls ( 12 ; 72 . 76 ; 80 ) having. Luminaire according to Claim 3, characterized in that the light-directing device has a body ( 10 ) having in cross-section the shape of a truncated at the top, open-top triangle. Luminaire according to one of claims 3 or 4, characterized in that in a cross section the line connecting the two end points of the floor ( 14 ; 50 ; 82 ), with a tangent to a side wall ( 12 ; 72 . 76 ; 80 ), passing through one of the end points, encloses an angle of 65 ° to 80 °. Luminaire according to one of claims 1 to 5, characterized in that the light-directing device two opposite sides ( 12 ; 72 . 76 ; 80 ), each of the reflector ( 3 ), wherein the transmission characteristics of these pages are different. Luminaire according to claim 6, characterized in that one of the two sides ( 12 ; 72 . 76 ; 80 ) to the inside of the device ( 10 ) is formed reflecting back. Luminaire according to one of claims 1 to 5, characterized that the light-directing device with regard to its geometry and / or symmetrical with respect to their optical properties Level is. Luminaire according to claim 8, characterized that the Light source is in said plane. Luminaire according to one of claims 1 to 9, characterized in that the refractive structure in a cross section, the light emission on the reflector ( 3 ) are limited to a range of angles below a critical angle β to a perpendicular to the side wall such that at least the major part of the light radiated through this side is radiated into the region below this critical angle. Luminaire according to claim 10, characterized in that at each light exit point of the side wall ( 12 ; 72 . 76 ; 80 ) the angle β is determined by the light-refracting structure, that light rays, which at the angle β from the side wall ( 12 ), onto the reflector ( 3 ) come to mind. Luminaire according to one of claims 1 to 11, characterized that the refractive structure consists of linear elements, the in a cross-section perpendicular to the line which the element follows, have a constant cross section. Luminaire according to claim 12, characterized in that that the Elements have a cross-section tapering from one base to two Have sides that connect to the base, where the sum of the angles, which the tangents to the two sides, which through the endpoints Run the base, with the base side in a range of 85 ° to 130 °. Luminaire according to claim 13, characterized that the Cross section has a triangular shape and the base side opposite Angle is 90 °. Luminaire according to one of Claims 1 to 14, characterized by a device which detects light emitted by the light source ( 1 ) is emitted in the emission direction of the direct light component, not or only partially passes. Luminaire according to claim 15, characterized in that a reflective or partially reflective element and partially transparent element ( 40 ) between the ground and the light source or through the ground ( 14 ; 50 ; 82 ) is formed. Luminaire according to claim 15 or 16, characterized in that an element ( 40 ) between the ground ( 14 ; 52 ; 82 ) and the light source is arranged, which has a refractive structure, the light not or only partially to the ground ( 14 ; 50 ; 82 ) or transmits transmitted light to a certain angular range to a perpendicular to the light exit surface. Luminaire according to one of claims 15 to 17, characterized in that the floor ( 14 ; 50 ; 82 ) is provided with a refractive structure which does not or only partially transmits light or concentrates transmitted light to a certain angular range to a normal to the light exit surface. Luminaire according to one of Claims 1 to 18, characterized in that the light-directing device has a light-directing body ( 10 ) whose bottom ( 14 ; 50 ) is formed integrally with the side walls. Luminaire according to claim 19, characterized in that the side edge of the floor ( 14 ; 50 ) and the side walls ( 12 ) is each provided with a chamfer which extends over only a part of the thickness, so that the bottom and side walls are connected by a material portion. Luminaire according to claim 20, characterized that the bevels lie in the manner of a miter to each other. Luminaire according to claim 20, characterized that the bevels on the same side of the body are formed as the refractive structures in one or several side walls and / or in the ground. Luminaire according to one of claims 3 to 22, characterized in that one or more side walls ( 72 ) and / or the floor a means for positive retention ( 74 ) of one or more plate- or foil-shaped elements ( 76 ) having a refractive structure. Luminaire according to one of claims 1 to 23, characterized that the Lamp has an asymmetric radiation characteristic. Luminaire according to one of claims 1 to 23, characterized that the Lamp has a symmetrical emission characteristics.