ES2906968T3 - Lighting method and device for illuminating wall surfaces - Google Patents

Abstract

Lighting device for illuminating wall surfaces such as book or article shelf walls, with at least one emitter (4) comprising a point light source (5) and a curved, shell-shaped reflector casing (6) multiaxially to capture and irradiate the light emitted by the light source (5) in the form of a beam of rays (7), the light source (5) presenting a main emission direction (5H) directed towards the reflector casing (6 ), the reflector casing (6) being configured to irradiate the wall surface (8) directed towards the respective reflector casing (6) only with indirect reflected light, and a portion of the direct, non-reflected light of the beam of rays (7) is limited to an opposite wall surface (9), from which the reflector casing (6) is directed in the opposite direction, and/or to the corridor floor (10), radiating the beam of rays (7) in a cut plane (V), which passes through the light source (5) perpendicular to the direction n of main emission (5H), an interval of at least 2 x 20° and being limited to an interval of at most 2 x 60°, characterized in that the shell-shaped half shell that forms the reflector shell (6) - forms overall a simple, harmoniously curved shell, or - has a constriction (6e) and comprises two shell halves (6a, 6b), which are connected to one another in the region of the constriction (6e) and together form a half shell in the form of a double shell.

Description

DESCRIPTION

Lighting method and device for illuminating wall surfaces

The present invention relates to a method, as well as to a lighting device for illuminating wall surfaces such as walls of shelves for articles or books, with at least one emitter, comprising a light source and a reflector casing in the form shell, curved multiaxially, to capture and emit the light emitted by the associated light source in the form of a beam of rays.

Such lighting devices are known from US 2017/0023208 A1 and US 2013/201674 A1.

Emitters can be used to illuminate vertical wall surfaces such as, for example, article or book shelves, or even museum or exhibition walls on which pictures are hung, which deflect the light cone via a reflector. directed at the wall and, if necessary, also at the floor, in order to illuminate corresponding wall surface portions. In this regard, emitters, which are mounted on top of a wall adjacent to it, for example on the ceiling, and illuminate the wall, are sometimes called wallwashers. However, emitters which emit generally downwards towards a floor surface are sometimes referred to as downlights, such emitters may be, for example, integrated into ceiling panels or freely pendant mounted and grouped in emitter-type arrangements. matrix. However, depending on the application, a single emitter can also be used, for example to illuminate a shop shelf, a shop window or an individual object.

In particular, such emitter arrangements can be used to illuminate long aisles, such as, for example, merchandise shelves in supermarkets, but also as shop lighting, for example, to illuminate display cabinets or as shelf lighting, kitchen lighting, lighting corridor lighting, stair lighting or in conference rooms for whiteboard or flipchart lighting. Furthermore, such emitter arrangements can also be incorporated in electrical appliances, such as refrigerators and ovens, for example, to illuminate wall and/or floor surfaces of the appliances.

For the illumination of long, narrow corridors, linear spotlight arrangements are commonly used, which extend along a longitudinal axis parallel to the axis of the corridor. However, in such linear spotlight arrangements there is often a dullness. Products on a merchandise shelf do not stand out brilliantly individually, but diffuse lighting is generated, absorbing contours.

If elongated lighting elements, such as fluorescent tubes, are not used, but point light sources such as, for example, LEDs are used, it makes sense not to use elongated reflectors, of the extruded profile type, but to use reflector housings individually associated with the light sources, which are multiaxially curved and can capture a greater part of the light emitted by such point light sources, to thereby achieve more efficient illumination.

In this regard, in particular each light source or each group of light sources, such as, for example, an array of LEDs, can be associated with a shell-shaped or half-shell reflector, which captures the light and the projects in the form of a beam of rays on a specific area of the corridor. A respective light source forms, together with the reflector associated with it, an emitter, so that the linear lighting device is formed from one or more rows of such emitters. However, in the case of such emitters with several individual reflectors, it is not entirely easy to achieve uniform and glare-free illumination of narrow and narrow corridors, since the beam of beams from a single emitter illuminates, as a rule, only one partial area of such a corridor.

In the case of long aisles in the form of merchandise shelves in supermarkets, it is furthermore difficult that the aisle walls formed by the shelf walls are not smooth, clear surfaces, which also in the case of very oblique irradiation at acute angles would have to illuminate evenly, but because the items found on the item shelves and often regrouped are shaped irregularly in the form of a constantly changing relief, have a different lightness or, depending on the item label, they are also dark. In addition, such shelf walls also have a certain depth, so that the lighting device should also illuminate as far as possible at least a certain distance into the bottom of the shelves, in order to illuminate articles that are located somewhat further. deep into the shelf.

At the same time, not only the items on the shelves themselves must be brightly illuminated, but also glare-free lighting for the visitor or customer as far as possible, but clear, also in the aisle between the aisle walls. and in particular on the floor of the corridor and in the "shopping cart". This implies inherently contradictory requirements for the height of the lighting device above the ground, which cannot both be met at the same time. Whereas a low arrangement of the lighting device would be advantageous for depth-of-shelf illumination, an absence of glare for customers walking in the aisles can be more easily achieved with a higher arrangement of the lighting device.

A linearly extending lighting device with an elongated housing is known, for example, from DE 102005 007 347 A1 or DE 20 2014 103 431 U1, this previously known lighting device having several lighting units mounted in a linear fashion. rotating way to be able to adapt the irradiation angle and thus be able to better meet different local circumstances.

Starting from this, the present invention is based on the object of creating an improved lighting device of the mentioned type, which avoids the disadvantages of the state of the art and improves the latter advantageously. In particular, lighting that is as uniform as possible must be achieved along the length of the corridor, which also goes transversely to the longitudinal direction to the deep part, which is as far as possible free of glare. Furthermore, the lighting device should advantageously be able to be adapted in a simple manner to different configurations of the walls to be illuminated, for example by regrouping the displayed articles.

According to the invention, said object is achieved by a lighting device according to claim 1, as well as a method according to claim 15. Preferred embodiments of the invention are the subject of the dependent claims.

That is, it is proposed that the emitter radiates direct non-reflected light as well as indirect reflected light, and divert the different proportions of light from the beam of rays emitted in each case by an emitter to different areas, in order to have different proportions of light in different space zones. In this connection, direct light emitted without reflection by an emitter beyond the reflector casing and indirect light reflected by the reflector casing are radiated to different areas.

According to the invention, the reflector casings are designed in each case to illuminate a wall surface directed towards the respective reflector casing only with indirect reflected light, while a portion of direct, unreflected light from the beam of rays is limited to one wall surface. opposite, with respect to which the reflector casing is directed in the opposite direction, and/or to the ground. Indirect reflected light in particular can illuminate shelf walls and the articles or books displayed on them evenly and softly without glare phenomena, but at the same time brightly, while direct non-reflected light can illuminate clearly a floor area or a wall area directed in the opposite direction, so that a customer or visitor walking there perceives a generally brightly lit corridor. At the same time, the beam of rays is widened in the longitudinal direction parallel to the wall surface to be illuminated, in order to allow a smooth overlapping of the illuminated areas, but at the same time it is limited in such a way that glare is avoided. the longitudinal direction. In a cut plane, which passes through the light source of the emitter perpendicular to its main emission direction, the beam of rays emitted by the emitter illuminates an area of at least 2 x 20°, said beam of light being limited rays in that plane at 2 x 60° or less. For example, the beam of rays can radiate in said plane an area of from 2 x 25° to approximately at most 2 x 50°.

That is, said main emission direction forms the normal vector of said longitudinal and/or section plane.

In this connection, the light source is directed with its main emission direction towards the reflector housing, the light source advantageously forming a point light source, for example in the form of an LED or a COB. In this connection, "point" is not to be understood in the mathematical sense, but in the sense of light technology means those light sources whose light beams appear to come out of a point in a different way than in the case of linear light sources such as, for example, fluorescent tubes.

In this regard, in a further development of the invention, the light sources of the transmitters can each be configured as half-space transmitters and be arranged in such a way that the respective light source radiates into a half-space, which is directed in the opposite direction to the wall surface, which is irradiated with indirect light by the reflective casing associated with said light source. That is, the light source radiates, so to speak, in the reverse, “wrong” direction, away from the shelf wall or wall surface to be illuminated, so that only the indirect light reflected by the reflector casing is returned. to said shelf wall. In contrast, direct, unreflected light radiated past the reflector casing does not strike said wall surface, but only the corridor floor and/or an opposite wall surface, eg of a corridor.

In order to ensure that no direct, unreflected light falls from the light sources on the wall surface to be illuminated with indirect light as intended, the light sources can each be arranged on a dimming bar, which extends at least approximately vertically in the direction of the longitudinal axis and together with the reflector casing it can delimit an internal reflector space, in which said light source is located. That is, said dimmer bar attenuates the light source with respect to the wall surface which, as intended, is to be illuminated only with indirect light.

In order to illuminate wall surfaces or shelf walls sufficiently brightly, the indirect light proportion of the beam of rays of an emitter can be clearly greater than the direct light proportion, for example, the indirect light proportion amounts to more than 75% or more than 90%, and the proportion of direct light less than 25% or less than 10 % of the total beam of rays of an emitter, however, the proportion of direct light being greater than 1 % or greater than 5%.

The reflector housings can advantageously be designed in each case as an approximately shell-shaped half housing, which partially captures the light emitted by the light source and projects it onto the wall surface to be illuminated. In this connection, the beam of rays emitted by the actively reflecting reflector surface of the reflector housing can be projected entirely towards the wall to be illuminated or, alternatively, partially towards the wall to be illuminated and partially towards the ground.

In order to achieve uniform illumination, for example, also of long corridors without conspicuous light-dark transitions, even if the lighting device is subdivided or divided into several individual emitters, which in each case illuminate only a partial area of an elongated corridor of this type, according to a further aspect of the present invention it is provided that the reflector casings are configured in each case to illuminate an approximately rectangular area in each case on the corridor wall facing the respective reflector casing, whose lateral limits coincide at least approximately with the lateral limits of other areas, which are illuminated by other emitters. In this regard, the various emitters can be attached to a common, elongated support extending along a longitudinal axis, with which the support can be oriented at least approximately parallel to the longitudinal direction of the wall surface or corridor to be illuminated.

The beams of rays emitted in each case by the reflectors can be outlined in the manner of a pyramid with a rectangular plan, to illuminate rectangular areas in the corridor wall, the various emitters being oriented and arranged in relation to each other in such a way that the illuminated areas in each case at least approximately follow one another and the vertical edges of the illuminated areas at least approximately coincide or are closely adjacent to each other. That is, in particular no unlit areas remain on the corridor wall and, conversely, light spots due to uneven overlaps are also avoided.

In order to achieve an additional homogenization of the light intensities in the corridor surfaces to be illuminated, in an improvement of the invention it can be provided that each area of the wall to be illuminated is irradiated by several emitters, the arrangement of such that each area along the wall to be illuminated is irradiated by the same number of emitters. Due to the overlapping of several emitters while avoiding irregular overlapping, uniform light intensities can be achieved along the entire wall to be illuminated.

In particular, the reflector shells can be configured in such a way that the areas illuminated by reflector shells adjacent to each other overlap approximately by half and the areas illuminated by two reflector shells, which are separated from each other by a reflector shell lying between them. the same, follow one another. In this way, each area of the wall to be illuminated is irradiated by exactly two transmitters.

In particular, the reflector shells can be contoured and arranged in such a way that an area is irradiated on the wall surface facing the reflector shells, which in each case extends to the next reflector shell. In other words, a reflector casing radiates a wall region that extends to the right to the neighboring right reflector casing and to the left to the neighboring left reflector casing.

According to the method of the invention, the proportion of direct non-reflected light that passes through the reflector shells is limited to the floor of the corridor, the reflector shells being contoured in such a way that the proportion of direct light of the beam of rays not reflected, limited by the edges of the reflector casing, illuminates an area having edge side limits, which extend parallel to the longitudinal axis of the lighting device and/or parallel to the longitudinal axis of the corridor. In this regard, the reflector casings are contoured and arranged in such a way that the proportion of direct light limited by the edges of the reflector casing and/or the attenuation bar irradiates an area whose edge extends along the angular transition between the corridor floor and the corridor wall. In this way, a light-dark border, which occurs at the edge of the area illuminated by direct light, can be disguised or hidden.

In order to achieve a certain illumination transversely to the longitudinal axis of the lighting device, also in the depth, for example, of shelf bottoms, but on the other hand not to have any dazzling effect on people in the lighting area in the longitudinal direction , the lighting device can advantageously be arranged, depending on the height of the corridor wall to be illuminated, at a height of from approximately 3 m to 4 m or from 3.2 m to 3.5 m above the ground, being able to rise the axial distance of the emitters from the wall of the corridor transversely to the longitudinal axis of the lighting device equally to approximately 0.75 m to 4 m or 1 m to 3 m. Depending on the corridor geometry, other arrangements can also be advantageous, in an advantageous development of the invention the axial distance of the emitters from the corridor wall transversely to the longitudinal axis may correspond to approximately in the range from 25% to 200%, for example, at approximately 50%-100% of the mounting height above the ground.

Alternatively or additionally, the lighting device can be arranged in such a way that the mounting height of the emitters above the ground is approximately 150% to 250%, in particular at approximately 200 % of the height of the shelf wall to be illuminated. Alternatively or additionally, the spacing of the emitters in the longitudinal direction, i.e. parallel to the longitudinal axis of the lighting device, can be approximately 150% to 250%, in particular approximately 150%, of the width of the corridor .

In a further development of the invention, the support with the emitters attached to it can be arranged above the corridor wall surface to be irradiated and at a distance from this corridor wall surface such that a main emission direction of the emitters directed downwards onto the corridor floor and/or the corridor wall irradiates the corridor wall obliquely at an acute angle and the floor surface radiates at least approximately frontally.

The reflector casings can advantageously be contoured in such a way that the indirect light reflected by the reflector casings is distributed over the corridor wall surface facing the reflector casings with an essentially uniform light intensity distribution over the entire height of the aisle. the hallway wall.

In a development of the invention, the reflector housings can each be shell-shaped, half-shell-shaped, in such a way that a focal point defined by the reflector housing is located at least approximately in the center of the source. of light. In a further development of the invention, the in each case approximately shell-shaped reflector housings can also be designed to function doubly converging and/or define at least one additional focal point, which can be in the cross-sectional area of the opening of the reflector housing or also outside the reflector housing. The reflected ray path, starting from the reflector casing, can roughly speaking form a double pyramid or a double cone, which first narrows away from the reflector casing, to widen again after passing the focal point or constriction. In this respect, the focal point does not have to be a point in the mathematical sense, but may be the narrowest point of an hourglass-like constriction, at which the ray path still has a noticeable diameter.

According to the invention, the reflector casing may have a simple shell shape, consisting of a casing that is generally uniformly convex. Alternatively, however, according to the invention, the reflector casing can also be walnut-shell-shaped and consist of two half-shells, the reflector casing having a constriction in the transition area between the two half-shells, which can manifest itself on the reflectively effective inner side of the reflector housing in the form of a longitudinal rib projecting inwards.

In the case of a constrained or nutshell-shaped or double-pear-shaped configuration of the reflector housing, each of said housing halves may be configured in the aforementioned manner to function in a doubly convergent manner, so that the outgoing ray path, in each case reflected by one shell half, is roughly in the form of a double pyramid or double cone or first narrows from the shell half to a constriction and then widens from new.

In the case of such a double shell or double pear shell shape of the generally shell-shaped reflector shell with a constriction between the shell halves, the shell halves can each be configured in such a way that the two cones or pyramids of reflected, irradiated rays overlap each other and radiate onto the surface to be illuminated as intended, essentially in each case completely the same area.

Due to said doubly converging configuration of the reflector housing and the constriction thus generated in the cross-section of the opening or outside the reflector housing, the emitters can also radiate through relatively small housing openings, compared to which the emitter optics are clearly larger. In this way, effective glare protection and attractive optics can be achieved.

In a further development of the invention, the reflector shells can be contoured in such a way that the beam of rays emitted by a reflector shell and/or by in each case one shell half of a reflector shell in a vertical plane perpendicular to the longitudinal axis of the lighting device through the light source has an angle of irradiation of from about 40° to 60° or about 50°, said range of angle of irradiation including a vertical above the ground.

By observing a vertical section plane through the light source parallel to said longitudinal axis of the lighting device, the reflector shell and/or each shell half can limit the angle of irradiation of the beam of rays advantageously to a range of from 2 x 20° to 2 x 60° or from 2 x 25° to 2 x 50° with respect to the vertical, to avoid glare phenomena in the longitudinal direction.

In order to achieve additional homogenization of the irradiation, to compensate for manufacturing and positioning tolerances of the light source and, if necessary, to achieve an improved light color mix in the case of several light sources of different colours, the optics of deflection may be provided on their reflective surfaces or totally reflective of faceting and/or microstructuring. For example, micro-facets can be provided, which can be configured in the form of flattenings, concave indentations or convex grains, a plurality of such facets, for example more than 25, being able to be provided on an active surface according to the lighting technology of the reflector. or more than 50, or more than 100, of such facets in a multi-row and/or multi-column arrangement. Alternatively or additionally, other relief microstructures can also be provided, such as, for example, geometrically regular relief contours, such as truncated pyramids, conical elevations or depressions, or similar structures.

In this regard, said faceting and/or said microstructuring may be provided/provided for on one or all of the reflecting surfaces of the reflector.

In an advantageous development of the invention, the reflector is configured in a simple reflecting-only manner, so that the light captured by the deflecting optics is reflected only once, before it is irradiated to the area on the wall or on the surface. soil.

The invention is explained in more detail below by means of advantageous embodiments. In the drawings show:

Figure 1: a schematic perspective representation of the lighting device for lighting a corridor and the shelf walls forming the walls of the corridor according to an advantageous embodiment of the invention.

Figure 2: a perspective representation of the lighting device of Figure 1, showing the arrangement of two rows of reflector casings and light sources associated in each case with these reflector casings, and illustrating the tilting capacity of the rows of reflective housings.

Figure 3: an exploded perspective representation of an emitter of the lighting device of the previous figures, comprising a reflective casing, a light source and a heat sink, to which the light source is attached, showing the partial view (a) a convex clamshell reflector housing in a simple way and partial view (b) a double clamshell reflector housing with a constriction, connecting the two housing halves of the reflector housing, in one view exploded in perspective and a mounted view,

Figure 4: a schematic representation of an individual emitter analogous to Figure 3, partial view (a) showing a longitudinal side view of the emitter and its simple shell-shaped reflector casing of Figure 3 (a) and partial view (b) a plan view of the reflector casing of figure 3 (a) transversely to the longitudinal axis of the lighting device, the partial view (c) also showing a longitudinal side view of the emitter of figure 3 (b) and its constrained double clamshell reflector casing, and partial view (d) a plan view of the constrained double clamshell reflector casing transversely to the longitudinal axis of the lighting device,

Figure 5: a plan view of the reflector housings of several emitters, which are combined to form a group of reflector housings,

Figure 6: a sectional view of an emitter in a vertical section plane through the light source perpendicular to the longitudinal axis of the lighting device, showing the beam of rays emitted and its proportions of direct light and light indirectly transversely to the longitudinal direction of the corridor,

Figure 7: a longitudinal sectional view in a vertical section plane parallel to the longitudinal axis of the lighting device, showing the beam of indirect light rays in the form of a pyramid and the rectangular area, illuminated by it, in a hall wall,

figure 8: a cross-sectional view similar to figure 6, showing the proportions of direct light and indirect light according to an embodiment variant, in which with the proportion of indirect light irradiates, in addition to the shelf walls , a piece of wall that is located above the bookshelf walls.

As the figures show, the lighting device 1 comprises several emitters 4, which can be arranged in one or two rows parallel to a longitudinal axis 3 of the lighting device 1. As figure 1 shows, the lighting device 1 has, seen as a whole, an elongated or longitudinally extended body, which may comprise a support 2 extending along the longitudinal axis 3, to which the emitters 4 are attached.

As FIG. 1 shows, the lighting device 1 can be mounted and positioned as intended in or above a corridor, the lighting device 1 with its longitudinal axis 3 preferably extending parallel to the longitudinal extent of the corridor. That is, the emitters 4 can in particular be arranged at least approximately in a common plane parallel to the ground, the rows, in which the emitters 4 are arranged, extending parallel to the direction of the corridor. In this connection, the emitters 4 can be oriented obliquely downwards towards the floor on opposite sides of the corridor or have main irradiation directions, which are inclined to different sides, but basically they are directed very steeply downwards onto the floor of the corridor, as will be explained in even more detail.

As FIG. 3 illustrates, each emitter 4 comprises a light source 5, for example in the form of an LED, which can be configured, for example, as a COB ( chip on board ) unit. ie a chip-on-board unit, in which the actual LED element is arranged on a printed circuit board, through which the LED can be powered. Arrays of LEDs can also be used as light sources, for example in the form of a grid-like LED arrangement, optionally multi-colored.

In this connection, the light sources 5 can advantageously be designed in each case as half-space emitters, which radiate their light into half-space.

In addition, each emitter 4 comprises a reflector casing 6, which can roughly be configured as a shell-shaped half casing and captures a large part of the light emitted by the associated light source 5 .

As FIG. 3(a) shows, a respective reflector shell 6 can in this respect form a simple, uniformly convex reflector shell. However, as FIG. 3(b) shows, a respective reflector casing 6 can also be configured in the form of a double shell and in this case have a constriction 6e extending in the longitudinal direction, and in which two halves of housing 6a and 6b, which together form the reflector housing 6, are connected to each other. In this respect, said constriction 6e can form a ridge or mountain ridge-like burr, projecting inwards, which forms the transition between the two shell halves.

The simple shell-shaped reflector casing 6 of the embodiment according to FIG. 3(a) can advantageously be configured in such a way that the reflected beam path, which starts from the reflector casing, first narrows towards a constriction and then it widens again and thus forms an overall roughly double cone or double pyramid, said double cone or double pyramid also being able to be configured slanted in the direction of a slanted pyramid. In the case of the double shell-shaped configuration of the reflector casing shown in Fig. 3(b), each of the casing halves 6a and 6b can be configured in such a way that the reflected ray path, which starts from from each housing half first narrows in the manner mentioned above towards a constriction and, starting from this, widens again, and thus a total of two beam-shaped beams radiate from the reflector housing double cone or double pyramid, which, however, can be advantageously superimposed on one another, as already explained at the beginning.

As FIG. 3 further shows, said reflector casing 6 can present in this respect, in addition to the active reflective casing-shaped reflector surface, also an inactive section from the point of luminous or non-reflective technology, in particular in in the form of a collar surrounding the active reflector housing, which can, for example, serve for mounting and/or attenuation or limitation of the proportion of direct light emitted by the light source.

As FIG. 5 illustrates, in this connection several reflector housings 6 of several emitters 4 can be grouped together to form a reflector housing group, in particular in the form of an integrally configured one-piece reflector component which, seen as a whole, has a elongated contour parallel to the longitudinal axis 3 of the lighting device 1, the individual reflector shells 6 however being configured multiaxially curved and individually extending transversely to the longitudinal axis 3.

As FIG. 3 shows, each emitter 4 also includes a dimming bar 11, which can advantageously form a heat sink at the same time and partially close off the respective reflector housing 6. As FIGS. 3 to 5 illustrate, each reflector housing 6 it may have a flat housing edge, on which said attenuation bar 11 in the form of the heat sink sits. The aforementioned light source 5 advantageously sits on the inner side of said attenuation bar 11 in the form of the heat sink, so that the light source 5 is arranged in a reflective internal space, which is delimited, on one side , by the reflector casing 6 and, on the other hand, by the attenuation bar 11.

As illustrated in figure 4, the reflective casing 6 extends beyond the attenuation bar 11, the attenuation bar 11 being able, for example, to cover or close only a section of the upper edge of the reflective casing 6, see figure 4 (a).

In this regard, the light source 5 is arranged in such a way that the light source 5 radiates into the interior of the reflector casing 6. In this regard, the main emission direction 5H of the light source 5 is away from the bar attenuation 11, in particular approximately perpendicularly, and impinges on the reflector housing 6, placed obliquely thereto, which is contoured in such a way that, seen in cross section, see figure 4(a), it captures the light emitted by the light source 5 at an angle of radiation of from about 120° to 170°, in particular from about 140° to 150°, and radiates it again in a reflected manner.

Considering that the light source 5, possibly with the help of the attenuation bar 11, radiates altogether in a radiation gap of approximately 180°, the reflector housing 6 then captures approximately two-thirds to four-fifths, in particular about three-fourths, of the emitted light.

Consequently, the proportion of direct light not captured by the reflector casing 6 and thus not reflected, can take an angle of irradiation of from about 20° to 60°, in particular from about 30° to 40°, being directed this proportion of light more or less perpendicularly downwards, but slightly inclined to the side, from which the reflector casing 6 is directed in the opposite direction.

As Fig. 4(b) shows, the beam of rays 7 emitted by the emitter 4, seen in the longitudinal direction, is limited to an irradiation angle of from about 2 x 40° to 2 x 60°, in particular about 2 x 50° symmetrically to the vertical and/or in a longitudinal and/or cutting plane V through the light source 5 perpendicular to its main emission direction 5H, to avoid glare in the longitudinal direction, see also figure 7.

As Figure 2 illustrates, the reflector casings 6 are directed with their active, reflective surface at one of the two aisle walls 8 or 9, so that the reflector casings 6 project indirect reflected light onto the respective aisle wall 8 or 9. In this connection, the light source 5 is directed away from this corridor wall, which is irradiated with indirect light by the reflector housing, and is therefore arranged, so to speak, upside down. If the light source 5 radiates with its main emission direction, for example to the right, the associated reflector 6 projects the reflected light to the left onto the corridor wall located there.

In figure 6 the beam of rays 7 emitted by an emitter 4 is represented in more detail. As can be seen therein, the beam of rays 7 emitted by an emitter 4 comprises, on the one hand, a proportion of indirect light 7i, that is i.e. the light reflected by the reflector 6, as well as a proportion of direct light 7d, i.e. the unreflected light, radiated beyond the reflector casing 6. In this regard, the emitter 4 and its reflector casing 6 are designed in such a way that the aisle or shelf wall 8 facing the reflector casing 6 is only irradiated with indirect light, while the proportion of direct light is limited to the aisle floor or an opposite aisle wall. In particular, the proportion of direct light can fall exclusively on the floor 10 of the corridor.

In this regard, the aforementioned indirect light proportion 7i again comprises two sub-proportions, namely, on the one hand, the indirect light proportion 7ir, which falls on the corridor wall 8 directed towards the reflector housing 6 or the shelf located there , as well as the proportion of indirect light 7ib, which falls on the floor 10 of the corridor.

Advantageously, the reflector casing 6 can be contoured in such a way that the proportion of direct light 7d irradiated on the floor of the corridor 10 irradiates an area, the limit of which runs at least approximately in the angular transition zone between the floor of the corridor 10 and the corridor 9 wall, to hide the light-dark border that results in this case or make it less visible.

If the design of the lighting device 1 shown in figure 2 is taken into account, which comprises two rows of emitters 4, the proportion of direct light 7d of the beam of rays 7 can be limited with its other edge, in figure 6, the left one, approximately perpendicularly centered below the lighting device, so that the direct light ratios of the two rows of emitters 4, so to speak, complement each other and illuminate the entire floor of the corridor 10.

However, the two emitter rows 4 illuminate the opposite corridor walls 8 and 9 in each case only with the indirect light proportion 7i of the respective beam 7.

Claims (15)

1. Lighting device for illuminating wall surfaces such as book or article shelf walls, with at least one emitter (4) comprising a point light source (5) and a shell-shaped reflector casing (6) , curved multiaxially to capture and radiate the light emitted by the light source (5) in the form of a beam of rays (7), the light source (5) presenting a main emission direction (5H) directed towards the reflector casing (6), the reflecting casing (6) being configured to irradiate the wall surface (8) directed towards the respective reflecting casing (6) only with reflected indirect light, and a proportion of non-reflected direct light of the beam of rays (7 ) is limited to an opposite wall surface (9), from which the reflector casing (6) is directed in the opposite direction, and/or to the corridor floor (10), radiating the beam of rays (7) in a plane cutoff (V), which passes through the light source (5) perpendicular to the direction main emission tion (5H), an interval of at least 2 x 20° and being limited to an interval of at most 2 x 60°, characterized in that the shell-shaped half shell forming the reflector shell (6) - together form a simple, harmoniously curved shell, or - has a constriction (6e) and comprises two shell halves (6a, 6b), which are connected to one another in the region of the constriction (6e) and together form a double shell-shaped half shell. Lighting device according to the preceding claim, wherein the light source (5) of the emitter (4) is designed as a half-space emitter and is arranged in such a way that the light source (5) radiates into a half-space, which it is limited by said cutting plane (V) and is directed in the opposite direction to the wall surface (8), which is irradiated with indirect light by the reflecting casing (6) associated with the light source (5). Lighting device according to one of the preceding claims, said section plane (V) being irradiated by indirect reflected light and/or coinciding at least approximately with a limit of the proportion of direct non-reflected light. Lighting device according to the preceding claim, the light source (5) being arranged on a dimming bar (11), which extends vertically in the direction of the longitudinal axis (3) and, together with the reflector housing (6 ), limits an internal reflector space (12), in which the light source (5) sits, limiting or forming the attenuation bar (11) a heat sink and/or a light source support. Lighting device according to one of the preceding claims, the shell-shaped half-shell or each of the half-shells of the half-shell being designed to function doubly converging and/or being contoured in such a way that a path of the reflected rays, which starts from the half-shell or from each half-shell of the half-shell, first narrows like a double cone or double pyramid towards a constriction and widens beyond the constriction new. Lighting device according to one of the preceding claims, a plurality of emitters (4) distributed along a longitudinal axis (3) being provided, the emitters (4) each comprising a point light source (5) and its own shell-shaped reflector casing (6), curved in each case multiaxially, to capture and radiate the light emitted by the light source (5) in the form of a beam of rays (7), the reflector casings being configured (6) in each case to illuminate an in each case approximately rectangular area (8c) on the wall surface (8) directed towards the respective reflector housing (6). 7. Lighting device according to the preceding claim, illuminating the beams (7) in each case in a section plane (V), which passes through the light source (5) of the respective emitter perpendicular to the respective main emission direction, an interval of at least 2 x 20° and being limited to a maximum of 2 x 60°, each beam of rays irradiating the wall surface directed towards the respective reflector casing (6) only with indirect reflected light and being limited a proportion of direct, unreflected light from the beam of rays (7) to an opposite wall surface (9), which is directed away from the reflector casing (6), and/or to the corridor floor (10). Lighting device according to one of the two preceding claims, the reflector housings (6) being configured in such a way that the areas (8a, 8b; 8b, 8c; 8c, 8d) illuminated by reflector housings (6) adjacent to one another they overlap in the middle and the areas illuminated by two reflector shells (6), which are separated from each other by an intervening reflector shell (6), follow one another. Lighting device according to one of the preceding claims, the reflector housings (6) being contoured in each case in such a way that the proportion of direct, unreflected light of the beam of rays (7) limited by the edges of the reflector housing (6), is limited to the floor of the corridor, and a border of the area irradiated by the proportion of direct light extends along the angular transition between the floor of the hallway and wall surface. Lighting device according to one of the preceding claims, the at least one emitter (4) being provided to be arranged above the wall surface to be irradiated and spaced from said wall surface (8) in such a way that a direction The main emission source directed downwards onto the floor (10) and/or the wall surface (8) irradiates the wall surface (8) obliquely at an acute angle and the floor surface (3) is irradiated at least approximately frontal, the at least one reflector casing (6) being configured to distribute the indirect light reflected by the reflector casing (6) on the wall surface (8) directed towards the reflector casing (6) with a uniform light intensity distribution in the range from 1:10 to 1:2 or from 1:6 to 1:4 over essentially the entire height of the wall surface. Lighting device according to one of the preceding claims, in which the reflector housings (6) are in each case designed to be simply reflective and all the light emitted by a light source (5) and captured by the housing is reflected at most once. associated reflector (6). Lighting device according to one of the preceding claims, the photometrically active surface of the at least one reflector housing (6) being provided with faceting and/or micro-structuring. Lighting device according to claim 6 or one of the claims dependent on it, the various reflector housings (6) being arranged in at least one row, the reflector housings arranged in one row being mounted on the support (2) of pivotable manner with respect to a common pivot axis (13, 14), which extends parallel to the longitudinal axis (3), the reflector housings (6) of a row being fastened to a common pivotable support part and can be tilted together with the same. Lighting device according to claim 6 or one of the claims dependent on it, the reflector housings (6) being arranged in two rows parallel to the longitudinal axis (3), the reflector housings (6) of one row being directed and the reflector shells (6) of the other rows towards opposite wall surfaces (8, 9), each of the rows of reflector shells (6) being mounted on the support (2) in a pivotable manner with respect to the pivot axis (13, 14) parallel to the longitudinal axis (3), the two rows of reflector casings (6) being able to pivot independently of each other. 15. Method for illuminating a wall surface such as a shelf wall for articles or books by means of a lighting device, which has at least one emitter (4) with a point light source (5) and a reflector housing (6) in the shape of a shell, curved multiaxially to capture and radiate the light emitted by the light source, the light source (5) presenting a main emission direction directed towards the reflector casing (6) and being radiated by at least an emitter (4) a beam of rays, comprising a proportion of direct light not reflected, radiated beyond the reflective casing, as well as a proportion of indirect light reflected in a simple way, radiating the beam of rays in a cut plane , passing through the light source perpendicular to the main emission direction, an interval of at least 2 by 20° and being limited to an interval of at most 2 by 60°, the wall surface being irradiated (8) directed towards him The reflective casing (6) of the emitter (4) only with said proportion of indirect light reflected in a simple way and radiating with the proportion of direct light not reflected only a corridor floor (10), characterized in that the proportion of direct light not reflected of the beam of rays (7), limited by the edges of the reflector casing (6), is limited to the floor of the corridor in such a way that an edge of the area irradiated by the proportion of direct light extends along the angular transition between the corridor floor and the wall surface.