EP1092919A2 - Lighting assembly - Google Patents

Abstract

The lighting arrangement has at least one light source, a housing (1) at least partly enclosing the light source with a light outlet opening, a transparent cover (8,9) over the opening and an arrangement (1,8) for converting the light from the source into scattered light. This arrangement is mounted so as to illuminate the transparent cover with scattered light.

Description

The invention relates to a lighting device, in particular as a signal or information light for lifts, with at least one light source and one the light source partially surrounding housing with a light exit opening and a translucent cover of the light exit opening.

Such lighting devices are widely known, wherein different light sources can be used, in particular LEDs.

The problem often occurs with conventional lighting devices that the optically perceptible light field, the size of which mostly corresponds to the light exit opening, is illuminated unevenly, e.g. because of the light source the next neighboring area of the illuminated field appears brighter than the more distant areas such. B. the edge areas. However, this appearance is for many applications undesirable, because it looks restless or if you move off or on object to be illuminated for an uneven light distribution leads. This is e.g. B. not acceptable if the Lighting device backlit an information carrier, so that the information field, e.g. B. a backlit lettering, appears in uneven brightness and thereby is less noticeable.

The invention is therefore based on the object of a lighting device to create a more homogeneously illuminated Has light field and is simple and inexpensive is.

This object is achieved in that means are provided which are the light emitted by the light source convert into stray light and which are arranged such that the translucent cover, preferably with a large area Stray light is applied. By transferring the emitted Stray light can enter the light outlet the lighting device and thus that of the light outlet opening assigned and visible from the outside more uniform be illuminated.

Means for generating scattered light can be provided, each reflecting the light emitted by the light source and / or can be converted into scattered light in transmission. Advantageously, at least in a partial area of the Scattered light generating agent that can still be resolved with the naked eye is, particularly preferably down to the microscopic range, homogeneous Stray light generated. The stray light generating agent generates thus preferably in reflection and / or transmission uniformly diffuse scattered light, preferably over its entire effective area.

In the beam path of the light emitted by the light source a translucent diffusing element can be provided, which preferably partially or completely covers and looks like a matt glass pane. The scattering element can, however, be disc-shaped have any other suitable shape, including those desired Shape of the light exit opening or optically perceived light field can depend.

The lighting device preferably has a reflector a scattering power for that emitted by the light source Light that at least partially surrounds the light source, preferably almost completely except for the light exit opening. This can create additional scattered light be dispensable. The reflector can make the scattered light too large Scatter portions back into the reflector interior so that multiple scattering occurs, and / or directly towards the Light exit opening.

The lighting device can have multiple light scattering devices have, in particular both a light-scattering reflector as well as e.g. the light exit opening partially or completely covering scatter element, e.g. in form of a Lens. Means can also be provided by means of which scattered the light before it hit the reflector e.g. an upstream translucent lens.

Through the scattering capacity of the reflector and / or the scattering element it will be as large as possible from the light source Solid angle emits light scattered and therefore a special one homogeneous light distribution with great light intensity over reaches the light exit opening. To achieve a homogeneous Illuminated, large-area illuminated field can be under May already be sufficient if a large part or the predominant part of the emitted light in front of the light field or is scattered in front of the light outlet opening, e.g. more than 50% or more than 75% of the emitted light.

The reflector and scattering element are preferably designed such that essentially all of the light source emitted light in the reflector interior or in the direction the filter disc is scattered. The reflector is in the essential, preferably practically perfect, opaque executed and closes essentially flush with the Scattering element. Only the reflector areas on which the light source is held or in which other necessary Devices are therefore not reflective executed.

The entire illuminated field or the light exit opening is preferred each with a scattered light generating means Stray light is applied, preferably by a plurality of stray light generating means at the same time, what each Scattered light generating means over the entire area of the illuminated field or can extend outlet opening. It can too multiple stray light generating means may be provided which cooperate the area of the illuminated field or the light exit opening apply stray light.

A simple embodiment exists when the lighting device has a housing and the housing inner wall as Reflector is designed with scattering power. The inside wall of the housing can be coated with an appropriate material be or the corresponding properties intrinsically exhibit. The spreading effect can, if necessary, by a corresponding Surface treatment of the housing material such as Roughening or changed by other surface treatments become. The scattering surface can also essentially be smooth and correspond to the usual surface quality, which can be achieved in the molding of a plastic part.

The reflector and / or the scattering element preferably have a light scattering capacity corresponding to a white color, preferably according to RAL 9003 or better, especially preferably according to RAL 9016 or better, i.e. Reflection and / or transmission properties that have a corresponding Effect light. This is a universal usable scattered light generating means such as a given light-scattering reflective surface, which is independent of the wavelength of the emitted light from the light source can be used. So light sources of different colors with constant reflectivity and scattering power in the Housing or used in the reflector.

According to a preferred embodiment, the Light on selective for the light emitted by the light source permeable filter element provided. This will appear the light field no longer with diffuse scattered light but as clear, particularly brilliant and transparent Illuminated field with homogeneous light distribution. The filter element has a multiple for the light emitted by the light source higher transmission than for light of other wavelengths, e.g. B. by a factor of 5, 10 or more, without this to be limited. The filter disc appears at Illumination with white light in the same color as that Light source. The translucency of the filter disc is if possible particularly closely to the emission spectrum of the Adapt light source so that the emission maximum of the light source a transmission maximum on a wavelength or frequency scale of the filter element. It goes without saying that emission and transmission spectrum of Light source and filter element are not always completely complementary are to be performed so that the filter element in particular lower or negligible in the wavelength ranges Emission of the light source or in the main emission region of the spectrum adjacent to the light source can have significant transmission.

The filter element advantageously covers the light exit opening from and / or forms the translucent one on the outside Cover of the lighting device. If provided Scattering element can be the filter element on the inside and / or be arranged on the outer side of the scattering element. The Light exit opening can be used for one from the light source emitted light-permeable scattering element covered be, the diffuser with one for that of the light source emitted light selectively permeable filter element is covered. However, e.g. even with a reflector light scattering properties the reflector opening with a Filter element can be provided without an additional scattering element is provided.

Scattering element and / or filter element can be disc-shaped be trained, e.g. in the form of plane-parallel plates, or each also have curved surfaces if necessary. The filter element can be directly or via intermediate layers of a Material placed on the scattering element, preferably avoiding air-filled rooms.

One or more light-emitting diodes are preferably used as the light source intended.

The one or more light sources can be on the side Walls of the reflector that are considered vertical to the diffuser existing side walls can be attached his. The light source can be arranged in such a way that the main emission direction is not directly the light exit opening but facing the interior of the reflector, e.g. B. its center or a (fictitious) middle level or one adjacent side wall, for which the light sources lying or also at an angle to the light exit opening with respect to the main emission direction can be arranged. This results in a "standing" arrangement aligned with the light exit opening better spreading efficiency.

The reflector can be separated by partitions with a spreading power for the light emitted by the light source in at least two or more light chambers can be divided, the Partitions are preferably opaque. In each of the individual chambers, a light source can be arranged, wherein the light sources of different chambers different can be executed, e.g. B. in terms of luminosity, color or other performance data or characteristics of the luminous characteristic. This allows a light field in front of the light exit opening of the reflector are generated that areas has different optical properties, the individual areas as well as the entire illuminated field in each case are homogeneously illuminated.

The partitions are preferably such with the adjacent ones Components such as the reflector walls or the diffuser connected opaque so that optically separated chambers arise. The surfaces of the Partitions are preferably white, especially with a Reflectivity according to RAL 9003 or 9016 or better executed.

The arrangement of the partitions can be varied in many ways can be removable or built-in, the reflector divide into several chambers of the same or different sizes, or, each independently, along lines of symmetry or other excellent directions of the reflector run or in any direction, e.g. also curvilinear.

The reflector or the housing can have any shape have, in particular a triangular, square, rectangular or round shape, being on each of the side surfaces evenly or unevenly distributed one or more Light sources can be arranged.

A particularly simple embodiment of the reflector or Housing is present if this consists of a preferably cut to length Profile consists of at least one, preferably two side and a bottom wall of the reflector or Housing forms, with end caps for attachment to the open Sides of the profile, preferably the opposite End faces are provided. This allows for easy Way a reflector or housing of practically any length just be made. The inside of the end caps are preferably white, especially the partitions executed with a color of high RAL number.

The components with high light scattering capacity (reflector, partitions, End caps) can only be superficial or complete consist of the light-scattering material.

To use the lighting device as an information carrier can, a between the scattering element and filter disc Foil with areas of reduced light transmission, e.g. B. in the form of a lettering. At the same time or alternatively, the scattering element and / or the filter element Have areas of different light transmission. These can be designed as blackening, e.g. B. by laser engraving the scattering element, or by making recesses, e.g. B. by mechanical engraving, and insertion a colored material in the wells, which differs from the Color of the filter element differs. The color of the introduced Material can be the basic color of the filter element correspond so that z. B. with red filter disc a dark red Material is introduced into the lens.

A circuit board for holding is preferably used as the light source and supply of an LED with an LED provided, the Board different connection options for the or has several LEDs, e.g. B. different contacting geometries, Supply with either 12 volts or 24 volts or with optional cathode or anode control of the LED.

Are several in one light chamber of the reflector or housing Light sources such as B. boards with one or two or more LEDs are provided, so the light sources are preferred connected in parallel.

The lighting device can also be a starting board have a housing or a reflector with a or is assigned to several light chambers, the starting board the commissioning of one or more light sources serves. The start board can also use LEDs for illumination of the reflector. The start board can be connected designed for voltage sources from 9 volts to 30 volts DC his.

A versatile application of the lighting device is given if this is designed such that at least one or more circuit boards carrying LEDs, optionally LEDs can be connected, the different operating parameters, in particular a different operating voltage, to have. The facility to enable the choice of farm can be on the start board or on the respective LED's supporting board may be arranged.

Fig. 1

eine erfindungsgemäße Leuchteinrichtung in einer ersten Ausführungsform in Explosionsdarstellung,

Fig. 2

eine erfindungsgemäße Leuchteinrichtung in einer zweiten Ausführungsform in Explosionsdarstellung,

Fig. 3

eine erfindungsgemäße Leuchteinrichtung in einer weiteren Ausführungsform in Explosionsdarstellung.

The invention is described below by way of example and explained using the figures as an example. Show it:

Fig. 1

a lighting device according to the invention in a first embodiment in an exploded view,

Fig. 2

a lighting device according to the invention in a second embodiment in an exploded view,

Fig. 3

a lighting device according to the invention in a further embodiment in an exploded view.

The lighting device consists of a box-shaped housing 1 made of practically opaque white plastic a color RAL 9016. The opposite long side walls 2 of the housing are provided with several windows that the Inclusion of boards 4 with two LEDs 3 each serve. Of course, if necessary, only one or several LEDs can be arranged on a circuit board. The Housing 1 is arranged by a centrally located in the longitudinal direction of the housing extending partition 5 in two independently illuminable light chambers 6 divided. The partition 5 separates the light chambers 6 optically completely different from each other and is also like the inside of the housing walls a plastic material that has a color according to RAL 9016 and therefore has a very high light scattering capacity. The individual light sources or LEDs are arranged horizontally, so that their main emission direction is inside the Reflector housing or towards the partition or one side wall is aligned. The light chambers 6 are hereby illuminated from one side, possibly additionally or alternatively lamps on the other side surfaces and / or the bottom side of the housing can be provided. Furthermore, the partition can be removed and moved be designed so that the housing optionally in different Light chambers can be divided. Of course the partition can also be aligned differently or others Partitions may be provided so that the housing shown, for. B. can be divided into six light chambers, one each Assigned light source in the form of a circuit board equipped with LEDs is. By choosing appropriate LEDs, the individual Light chambers different in terms of color, luminosity or other properties (flashing light, etc.) are illuminated become. Electrical plug connections can be used to supply the LEDs be provided. So the LEDs can also be on Partition walls can be provided which e.g. with plug contacts or integrated electrical lines are provided. It can Partitions can also be provided that only a light chamber downsize, i.e. create an unilluminated light chamber.

A lens 8 is placed on the reflection housing, so that this with the housing and possibly with the partition 5th is flush and essentially opaque. For this purpose, a corresponding receiving groove can be made on the edge of the housing be designed for the lens 8. The translucent Diffuser here consists of white polycarbonate, and also other materials can be used. The through the scatter element formed light outlet opening of the lighting device hereby illuminated particularly homogeneously over its surface.

Above the scattering element, i.e. H. the facing away from the housing 1 Side, a filter element 9 is provided, which consists of a transparent material, which is selective for that of light emitted by the light source is transmissive, that is Colors of the corresponding LED's is adjusted so that, for. B. red or green LEDs for red or green light permeable Filter elements are assigned. The filter element consists of polycarbonate or plexiglass (PMMA), whereby also other materials are possible. Through the filter element 9 is that which is emitted or transmitted by the scattering element Flare in an appearance of a clear, transparent Luminous field transferred with high luminosity.

An intermediate film is between the scattering element 8 and the filter element 9 10 inserted, advantageously no space to the adjacent components. The intermediate films 10 can contrast with the color of the filter elements Be provided with symbols, texts or other information, especially in black letters. However, it can also do that Scattering element 8 serve as an information carrier and with this colored or black elements.

According to a further possible application, the lighting device can be installed also a partially radiant information carrier be provided, e.g. B. in the form of an openwork Plate, so that the lettering or the surrounding the lettering Area to be illuminated by the lighting device.

For attaching the filter disc, lens and intermediate film is the filter disc with a circumferential shoulder 11 provided, on which a frame, not shown, can be fitted and attached the housing can be fixed.

According to the exemplary embodiment, six boards, each with two LEDs, are arranged in the box-shaped reflection housing with a base area of approximately 9 x 8 cm and a wall height of approximately 1 cm. The luminosity of the LEDs is approx. 3000 mCD, the radiation angle approx. 30 °. The operating voltage of the LEDs is 24 volts. The luminosity per cm ² is therefore approximately 500 mCD / cm ² . Corresponding luminosities can of course also be achieved by choosing other LEDs, e.g. B. with six LEDs each 5000 mCD with an opening angle of 50 to 55 °. The inventive design of the lighting device can thus achieve a homogeneously and brightly illuminated illuminated field with an illuminance of 1000 to 2000 mCD / cm ² , preferably approximately 500 mCD / cm ² or less.

In the embodiments shown in Figures 2 and 3 are instead of the one-piece housing with molded side walls 7 according to FIG. 1, removable end caps 12 are provided. The end caps are also with fastening tabs 13 provided so that the tub-like housing is simple is. The end caps 12 according to Figure 2 have a certain depth on so that it fits into the case over virtually all of it Intervene width and reach over a step paragraph 14 the case stone side, creating an opaque connection is present.

The housing can e.g. can be cut to length from an elongated U-profile or several housings can be attached by suitable means the narrow sides are combined with removable side parts, in the connection area the light chambers are adjacent Housing either separated from each other or translucent can be connected. This can be practical any length of light or even branched lighting device can be achieved with homogeneous illumination, creating a modular system is created. The modular housing or Reflector can be one continuous or several separate Have scattering elements and / or filter elements. Also the End caps consist of the inside or completely almost opaque white plastic with a Color RAL 9016.

In the embodiment of Figure 3, the boards are with LEDs integrated in openings in the end caps 14, in place in the side walls of the U-shaped housing, which makes manufacturing advantages. Of course both variants can also be combined.

Reference list

1

casing

2nd

Side wall

3rd

LED

4th

circuit board

5

partition wall

6

Light chamber

7

outside wall

8th

Lens

9

Filter element

10th

Intermediate film

11

paragraph

12th

End cap

13

Mounting tab

14

End cap

Claims (18)

Luminous device, in particular as an information or signal light for lifts, with at least one light source and a housing at least partially surrounding the light source with a light exit opening and a translucent cover of the light exit opening, characterized in that means (1, 8) are provided which the by convert light emitted by the light source into scattered light and which are arranged in such a way that scattered light is applied to the translucent cover (8, 9). Lighting device according to claim 1, characterized in that a light-transmitting diffusing element (8) is arranged in the beam path of the light emitted by the light source. Lighting device according to one of claims 1 or 2, characterized in that a reflector (1) is provided with a scattering capacity for the light emitted by the light source, which scatters it into the interior of the reflector and / or in the direction of the light exit opening. Lighting device according to one of claims 1 to 3, characterized in that the reflector (1) and / or scattering element (8) are designed such that essentially all of the light emitted by the light source is scattered into the interior of the reflector and / or in the direction of the light exit opening . Lighting device according to one of claims 1 to 4, characterized in that the housing inner wall of the housing (1) is designed as a reflector. Lighting device according to one of claims 1 to 5, characterized in that the reflector (1) and / or the scattering element (8) has a light scattering capacity corresponding to a white color, preferably according to RAL 9003 or better, particularly preferably according to RAL 9016 or better. Lighting device according to one of claims 1 to 6, characterized in that a filter element (9) which is selectively permeable to the light emitted by the light source is provided in the beam path of the light. Lighting device according to claim 7, characterized in that the filter element (9) covers the light exit opening of the reflector and / or the housing (1). Lighting device according to claim 7 or 8, characterized in that the filter element (9) is arranged in the beam path of the emerging light in front of and / or behind the diffusing element (8). Lighting device according to one of claims 1 to 9, characterized in that the light source has at least one light-emitting diode (3). Lighting device according to one of claims 1 to 10, characterized in that one or more light sources (3) are arranged such that the main emission direction thereof faces the interior of the reflector (1) or a side or partition wall (2, 5) of the lighting device is. Lighting device according to one of claims 1 to 11, characterized in that the reflector and / or the housing (1) is divided into at least two light chambers (6) by at least one partition (5) with a scattering capacity for the light emitted by the light source. Lighting device according to one of claims 1 to 12, characterized in that the reflector and / or the housing (1) consists of a profile, preferably a cut to length, which forms at least one, preferably two, side and a bottom wall, and that elements (14) are provided for closing the open sides of the profile. Lighting device according to one of claims 1 to 13, characterized in that at least one side wall (2) of the housing or reflector (1) is designed such that on the housing or reflector side associated with this wall, a further housing or a reflector with an open or closed side wall can be arranged. Lighting device according to claim 14, characterized in that at least one side wall (2) of the housing or reflector (1) can be removed, that a further housing or reflector with an open or closed side wall can be arranged on the housing or reflector side assigned to this wall and that means for fixing the housing or reflectors to each other are provided. Lighting device according to one of claims 1 to 15, characterized in that an intermediate layer (10) with areas of reduced light transmission is arranged between the diffusing element (8) and the filter element (9) and / or that the diffusing element (8) and / or the filter element has areas of different Has / have translucency. Lighting device according to one of claims 1 to 16, characterized in that a circuit board (4) for holding and supplying an LED with an LED (3) is provided, the circuit board (4) having different connection options for the or more LEDs, and / or that a circuit board (4) is provided to which at least one or more LEDs can be connected, which have different operating parameters. Lighting device according to one of claims 1 to 17, characterized in that a starting board (4) is provided, which is assigned to a housing or a reflector with one or more light chambers, the starting board being used for starting up one or more light sources, and if necessary has at least one LED for illuminating the housing or reflector.

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