DE20023536U1 - Flat lamp with for providing uniform illumination in large room, has reflector and diffuser plate together with light source - Google Patents

Abstract

The flat lamp has a reflector and a diffuser plate together with a light source. The flat lamp is designed so that the diffuser panel has a line pattern. The coverage, of the diffuser panel (16) in the respective region of the panel, is inversely proportional to the light amount falling in this region of the panel, from the light source (10) and the reflectors (12,14. The light source is a fluorescent tube. The line pattern is designed as line printing in through shining color partly illuminated by the inner light source.

Description

The The invention relates to a flat lamp with a uniform radiation characteristic according to the preamble of the main claim.

at Lighting is common the need, this preferably inconspicuous to arrange and yet large To illuminate rooms evenly. For example, subway stations clearly more pleasant with lights out, their radiation characteristics is even as brightly perceived, very punctually bright light sources.

A uniform emission characteristics now from all possible directions in space that no lighter Center area and darker outside areas of a luminous area available are, but a uniform bright Appearance is present.

These evenly bright Appearance from all viewing directions then ensures a uniform illumination the room around the lamp.

to Time can be the uniform appearance like Radiation can only be achieved by using bulky lamp housings in which, for example, a mirror-like reflector with the lamp in focus for it take care of that the outlet opening the lamp a uniform amount of light in all areas of the outlet is available. Especially in the application example for subway lighting, however, it is obvious that such voluminous lamps are not applicable in every case, but to strive for flat lighting elements are, on the other hand, often not enough Place in a wall or the like is present to a lighting element on the other hand often the clear height is tight, so this not be additionally reduced by lamps or the like should.

But even with lighting elements that hang in high rooms from the ceiling, is it wanted one possible flat, low-occupancy housing of the lamp or luminaire so as not to cause large, and thus necessarily anchors heavy objects in the space Need to become. Here is also an unaufbringliche, the brightness on preferably size Areas of the light-emitting radiation characteristic especially important.

One further application example for Such flat lights are illuminated signs, which are also good in all areas need to be illuminated to the font or what always shown on the signs, no changing by the lighting technology Assign brightness.

The Invention has therefore set itself the task of a flat lamp to create a uniform radiation characteristic into the room.

According to the invention this is solved by the features of the main claim. The subclaims give advantageous embodiments the invention again.

Especially is advantageous that through a line patterned diffuser disk individual areas the luminaire outlet opening inversely proportional to the incident in this region of the disc Amount of light from the light source are shaded, so that a even radiation the amount of light over the entire diffuser disk or light exit opening of the luminaire results.

Different, as partially perforated reflectors, which are usually made of metal be prepared and thus only in their Durchlaßcharakteristiken or can not be made to pass, which leads to quite bright, for the Eye uncomfortable bright transmitted light conditions to lead can, can the lines in varying strength (for a varying coverage) printed on the diffuser and lit from behind the one Assume brightness due to the adjacent areas in the Transmitted light from the lamp itself lit, accept.

Especially when using with white Color printed line patterns gives a very pleasant, uniform impression, where when using fluorescent tubes suggested is the white one Lines with each line width adjusting to the illuminance transverse to the fluorescent tube extension provide close together.

For example can with a line thickness of 6 mm in strong shading areas, in which only a free distance of 3 mm between the lines remains, up to a line thickness of 1 mm, at a distance of 8 mm between the lines, the corresponding amount of light remains directly lets through, stepless be varied.

It is also conceivable to partially reflect the lines inwards, by first making a reflective, then an optionally more extensive, white printing on the diffuser disk. For the eye, the line that is not translucent in the middle does not appear dark due to the small dimensions and the outer, bright edge, but rather, subjectively, to a certain distance, a homogeneous luminance distribution is obtained perceived on the lamp exit surface.

By However, the mirroring will be a significant part of the otherwise in the white Color absorbed energy thrown back on the reflector, so that one more effective use of the light source becomes possible.

It is possible, too, the lines on the presence of multiple light sources in a light vote.

As well can, especially if the light source in an asymmetrical Reflector is provided, including a desired, directed to the side radiation characteristic the lamp can be achieved, yet over the entire surface of the A homogeneous luminance distribution prevails, only the Total luminosity dependent increases or decreases from the viewing direction.

For this is proposed in particular, further reflector blades behind the diffuser disc, for example, with a thickness, the approximately corresponds to the distance of the illuminant center to the diffuser disk, aslant placed as hollow mirror strip-like lamellae parallel to the light source extend along the extension of the flat lamp.

The Reflector blades are bent convexly to the light source and can be set at different angles so as to illuminate a plurality of "light beams" in the room allow.

Further Advantages and features of the invention will become apparent from the following Description of a preferred embodiment with reference to attached Drawing. Showing:

1 a schematic plan view of an entire lamp,

2 a detail of the 1 in which one of the white lines running parallel to each other (with varying thickness) is additionally hatched for the purpose of better illustration for this description,

3 the cross section through a provided with a teilelipsoidförmigen reflector mirror flat light, are arranged in the four reflector fins,

4 a flat lamp, like 3 but with partial reflector sections only in the edge region of the luminaire,

5 a schematic representation of a flat lamp in cross section as 3 , but with two bulbs and a central reflector plate associated with both bulbs, and

6 a cross section like 3 , but with asymmetrical reflector and acentric illuminant and only one additional reflector lamella.

The in the 1 The light shown has in its center an increased brightness, which are due to the widened strips in this area. In the illuminated state, the darker areas are illuminated by strong incidence of light, so that there is a homogeneous luminance distribution of the lamp.

The appearance of a single strip provided across a bulb tube provided in the center is shown in FIG 2 hatched shown. By way of example, dimensions of 1 to 6 mm wide, white lines are provided as dimensions, which are provided at a distance of 3 to 8 mm (the latter between the very thin strips). In the event that further reflector strips are arranged in the region of the diffuser disk, as in the following drawings 3 to 6 It can also be seen that an abrupt change in thickness can be provided in the region of the reflector strips in order to optically conceal the luminance changes otherwise caused by reflector strips.

In the 3 is shown as a fluorescent tube 10 is arranged centrally in the middle of the flat lamp, through a mirror-like reflector 14 is limited to the rear and to achieve a very wide radiation characteristics, which extends not only in front of the lamp, but evenly on the side of the luminaire located space areas, with additional reflector strips 12 is trained.

These reflector strips 12 inside the luminaire, in cross-section as evenly spaced between the edge region of the reflector mirror, the forward to the diffuser disc 16 extends parallel to the longitudinal edges of the luminaire, are like parts of the main reflector to the arc tube concave (ie curved with the curved side to the outside). On the reflector strips 12 striking light is, as is illustrated by the example indicated beam angle in the drawing, with other - and in itself not consistent - angles reflected in the room, as by the main reflector 14 the case is.

In the 6 is a flat lamp with directional beam characteristic shown, due to the parabolic in the main reflector main with a centered light means (adjacent to a longitudinal side of the lamp) radiates its main light output obliquely to the side. Provision of reflector strips may allow some of the luminous flux to be dissipated into the room.

In the 5 is shown as well as several bulbs can be arranged by providing reflector strips and the line arrangement according to the invention on the diffuser disc in a flat lamp, which still results in a homogeneous luminance distribution at the light exit. Center is a doppelkonkaver reflector strip 22 provided, which tapers pointedly on the diffuser discs. In order for the main reflector 14 to avoid a double reflection of both fluorescent tubes are the reflector lamellae 12 . 22 deeper into the interior of the luminaire, approximately half the luminous depth and / or extension of the luminaire base 24 running into the light.

In the 4 Finally, it is shown that can be dispensed with a hollow mirror-like main reflector, and a substantially planar back 26 the lamp can be irradiated by this, as can be repaired by the arbitrary design of the lines, the otherwise resulting in a flat back wall bright light emission effects. Only small main reflector side sections 28 are still provided next to the reflector fins.

Claims (7)

Flat luminaire with uniform radiation characteristics with a reflector, a diffuser disk and a light source ( 14 ), characterized in that the diffuser disk is provided with a line pattern which is inversely proportional to the quantity of light incident in this region of the disk from the light source and the reflector in its coverage proportion of the diffuser disk in the respective region of the disk. Flat lamp according to claim 1, characterized that this Line pattern as partially illuminated by the inner light source Line printing is formed in translucent color. Flat lamp according to one of the preceding claims, characterized characterized in that Light source a fluorescent tube is and the lines are transverse to the extension of the fluorescent tube the diffuser disc are located. Flat lamp according to one of the preceding claims, characterized characterized in that Lines in white Color are applied. Flat lamp according to one of the preceding claims, characterized characterized in that at least Parts of the line printing are mirrored inside. Flat lamp according to one of the preceding claims, characterized due to reflector fins, which are located in the area of the diffuser disk extending hollow mirror strip. Flat lamp according to one of the preceding claims, characterized characterized in that Reflector blades symmetrical to serving as a light source Fluorescent tube are curved concave towards this and strip over the extend the entire extension of the flat lamp, while in their Bending essentially the parallel bend of the main reflector correspond.