EP2233829A1 - Round reflector for electromagnetic radiation - Google Patents

Abstract

The reflector has a round blank made of aluminum sheet that is anodized on reflecting side. Star-shaped strip-like fingers (2) protrude downward from a center section (1) of the round blank, where the fingers are bent to a reflector form. Longitudinal edges of the fingers are arranged in an overlapping manner. Adjacent fingers are connected with each other by fasteners (3) e.g. screw fasteners, plug fasteners, and locking fasteners, that are riveted or welded, where the fasteners and the connection are provided at a center section of a turned away end region of the fingers.

Description

The invention relates to a round reflector for electromagnetic radiation, in particular for light beams for lighting purposes.

Such reflectors are known in the prior art. For illumination purposes, for example, the reflectors have the task of reflecting the radiation flow from a light source onto an object or a surface that is to be illuminated. For this task, there are a number of lamp types with different technologies for generating the corresponding radiation flux. These are, for example, incandescent or halogen lamps, fluorescent lamps or compact fluorescent lamps, metal halide lamps or sodium vapor lamps as well as induction lamps.

The radiant flux of the lamp reaches the reflector. The reflector reflects the light giving construction element of the lamp, so the lamp filament or the discharge vessel of the lamp to the outside. For mirroring, the space vectors, light incidence angle = light angle of reflection apply, in each case against the solder on the reflector surface.

The different lamps have different proportions. There are very compact coils, for example, in low-voltage halogen lamps, elongated coils in rod-shaped high-voltage halogen lamps, luminous thin glass tubes for fluorescent lamps or glass tube bundles in compact fluorescent lamps and very small cylindrical discharge vessels for burners of metal halide lamps as well as U-shaped or spiral discharge tubes for flashlamps ,

The surface of the reflectors can be highly polished, have regular or irregular surface textures. Reflectors have different lighting tasks, such as a light intensity distribution of narrow, for example, 10 ° as a spot or medium of 30 ° or as a flood 60 °.

In order for the reflectors to be able to reflect the radiation flux from the lamp so that the desired objects are illuminated in the correct light, the reflectors fulfill a number of tasks.

The reflectors are designed and manufactured so that the desired light distribution can be achieved via the reflector profile. In this case, the efficiency is important, the reflector can record a reasonable maximum of radiation flux of the lamp. It should give only a reasonable minimum of multiple reflections from the lamp to the reflector and back to the lamp and then to the outside. In rod-shaped long lamps axially in the round reflector that is a problem because when not flawless reflector profile in the direction of the rear reflector axis, the efficiency can be significantly reduced. The radiation flux of the lamp only reaches the outside after several reflections in many wrong directions between the reflector and the lamp.

The different lamp types generate their radiation flow quite inhomogeneous with regard to light intensity as well as light color. The light for lighting must be uniform. There must also be no color spots on the objects to be illuminated. In general, the reflector receives a surface that should have the highest possible total reflection for the efficiency of the lamp. However, part of the reflection must be diffuse to mix the inhomogeneous flux of the lamps, irregularities in the reflector, and small mounting errors in the lamp position. The production of reflectors takes place in the case of the round reflectors concerned from round blanks in pressing. The spinning tool has the reflector profile, the reflector surface is applied to the spinning tool. This is done by sandblasting, eroding, etching after a photo template, by milling and earlier also by punches. The pressing process is a very old technology. At the same time, only one reflector per spinning machine can be produced. The technology is very wage intensive.

Another technology for reflector fabrication is tensile forming. When deep drawing a sheet metal blank is fixed by a hold-down and converted by a drawing punch in one or more moves to a hollow body. In hydromechanical deep drawing, the reflector is formed by the shape of the drawing punch under pressure of the hydraulic fluid. In the hydroforming process, a membrane protects the future reflector from the pressure fluid.

The reflector requires in any case after the pressing chemical technologies. Its surface must be able to reflect the light with as little absorption as possible, its surface must receive a protective layer against corrosion. In the interest of mirroring with a minimum of absorption, high purity aluminum is also used plated. The gloss is created by anodic glazing with the help of direct current in electrochemical plants. The Corrosion protection layer is created by anodic oxidation. However, this oxidation of the reflector surface also has a low diffuse reflection and absorption. By additions in the electrochemical baths you can color the oxide layer, in any case, these chemical aftertreatment of the reflector surface slightly reduce the efficiency of the lamp. The use of electrochemical baths is also a difficult and polluting technology. But it is indispensable for round reflectors, which are produced by pressing.

There are gutters or box reflectors. These are cut from strip material, punched or lasered. These strip materials have a finished surface. The surface structure is already rolled up. The total reflection and thus the luminaire efficiency is significantly better than with the above-mentioned reflectors made from blanks or blanks of untreated aluminum.

Based on this prior art, the present invention seeks to improve the reflector production and cost-effective to create highly effective round reflectors, in which the efficiency is improved and also the light design can be influenced in a simple manner. Environmental problems should be overcome by eliminating electrochemical baths needed. An automated production is to be made possible and reflector lamp combinations are to be made possible, which are not feasible with the usual technology.

To achieve this object, the invention proposes that the reflector consists of a blank made of aluminum sheet, which is anodized on the reflective side, wherein protrude from a central part of the Ronde star-shaped strip-like fingers that are bent into a reflector shape.

According to this technology, the conventional production of round reflectors is replaced by a blank made of aluminum sheet, which consists of pre-anodized material is cut or lasered so that protrude starting from a central part of the Ronde star-shaped strip-like fingers. These fingers can be bent in a simple manner to a reflector shape, so that then a round reflector is formed.

The photometrically generated results of a conventional round reflector and the reflector according to the invention are virtually the same in both types of light intensity distribution. It is also the same lamp, so light source used. Reflector diameter, reflector height and focal point are also consistent with conventional practice. Of the However, the reflector according to the invention has the significant advantage that its efficiency is considerably higher, since the reflector material pre-anodized strip material is used. The hitherto conventional spinning method including the polluting electrochemical baths is eliminated.

The cutting of the corresponding Ronde with the fingers can be made of strip material. Here are unrestricted photometrically best reflector qualities usable. The advantage of better efficiency follows from the better reflector surface with higher overall reflection. Gas discharge lamps require a proportion of diffuse light scattering. These surface qualities are to be taken into account during production. The finished blank is bent over a tool with the desired reflector profile. Each finger-like strip of the blank corresponds to a partial reflector.

Depending on the application, it may be advantageous if the longitudinal edge edges of the fingers are arranged overlapping each other.

As a result, light-transmitted column of the reflector can be avoided.

In addition, it can preferably be provided that the fingers are connected to one another at their ends.

Here, the desired curved reflector shape is finally fixed by the connection of the fingers at their ends.

In addition, it is preferably provided that the adjacent fingers are connected to one another by screw connection means, plug connection means, latching connection means or are riveted or welded, wherein the connection means or the connection is preferably provided on the end portion of the fingers facing away from the middle part.

For example, the individual fingers of the reflector star can be joined together by hook connections.

Preferably, it is further provided that the one side longitudinal edge of the finger is radially directed and the other side longitudinal edge has a directed away from the radially directed edge buckle, which covers the adjacent radially directed side longitudinal edge of the adjacent finger in the finished curved reflector.

The geometry of the partial reflectors of the blank follows from the lighting task. The strip width of the fingers, which form the partial reflectors, from the inside to the outside is therefore not a straight line on at least one side, but a continuous curve.

It is centered, so inward initially broader than a straight line. The difference is smaller to the outside. In the area of the connection of the adjacent fingers there is an overlap, which also prevents the light emission between the individual partial reflectors, which are formed by the fingers, to the outside.

The reflector according to the invention for light and electromagnetic radiation has the function of a round reflector, but is realized as a quasi polygon profile.

A possibly preferred development is seen in that the fingers are flat in cross section.

In this way, quasi straight individual reflectors are formed by the individual fingers, which fan the light of the reflector, which in the center of the reflector little, but more towards the edge. The uniformity of the light intensity distribution is thereby improved.

An alternative embodiment is seen in that the fingers are convex in cross section.

Here, the convex individual reflectors spread the light of the reflector more outward than the reflector with flat individual reflectors. This design with convex single reflectors Preferably used when the lamp is limited in the installation height for the reflector, for example, if only space in the installation height for a spot reflector is desired, but also a Floodreflektor, which is usually much higher, to be installed. The reflector concept according to the invention is therefore more versatile and can solve lighting tasks that are not solvable with conventional reflectors.

Another alternative is seen in that the fingers are concave in cross-section.

According to this embodiment, the concave single reflectors spread the light of the reflector crosswise to the outside. This design with concave single reflectors is preferably used when the lamp is limited in the installation height for the reflector.

A further preferred embodiment is seen in that the fingers in cross-section form a linear angle profile, for example a triangle.

In this way, an additional spreading and more reflectors is achieved with each individual reflector. Here too, the flanks of each individual reflector spread the light of the reflector more outward than in the case of a reflector with flat individual reflectors. These Design can also apply if the luminaire is limited in the installation height for the reflector. For example, if the installation height only space for a spot reflector, but a Floodreflektor is desired, which is usually much higher, the reflector of the invention can be used and solve this lighting task.

Preferably, it is also provided that the fingers connect to the middle part via a bending edge directed tangentially to the middle part.

Alternatively, it can also be provided that the fingers connect via a bending edge to the central part, which encloses a flat angle with the tangent to the central part.

Here, the individual fingers are not arranged tangentially, but they are quasi rotated against the tangential arrangement, so that in the transverse profile a sawtooth-shaped arrangement arises. As a result, the light is not directly reflected back into the bulb, but laterally over, so that a greater efficiency is achieved.

Furthermore, it can be provided that connect to the middle part at least 6 and at most 24 fingers, which are distributed uniformly over the circumference of the middle part.

Also, it can be provided that every finger in its surface is faceted.

In addition, it can be provided that each finger forms a freeform surface.

It can also be provided that the free ends of the fingers form an angled flange, wherein the flanges of all fingers in the finished bent state of the fingers form a peripheral annular flange edge.

In addition, it can be provided that the fingers are arranged alternately overlapping each other with the side longitudinal edge edges.

It can also be provided that the fingers are arranged with their adjacent side longitudinal edge edges in abutment.

It is particularly preferred that the reflector is integrally formed on one side of an anodized sheet metal, in particular aluminum sheet, wherein the acting as a reflector surface high-lamination rolled, finished, brushed finely brushed, sanded or matted.

In addition, it is preferably provided that the fingers are formed as widening from the middle part to the free end trapeze.

In a manner known per se, it is provided that the middle part is preferably perforated centrally and in the holes an electric blasting agent is used.

In this way, for example, the socket can be used for a corresponding abrasive in the perforation and the blasting agent used in the desired position relative to the reflector in this version and mounted on the reflector.

Figur 1

einen erfindungsgemäßen Reflektor in Draufsicht von außen gesehen;

Figur 2

desgleichen in Seitenansicht;

Figur 3

einen Zuschnitt zur Fertigung eines Rundreflektors gemäß Figur 1 und 2 in Draufsicht gesehen;

Figur 4 bis 7

unterschiedliche Querschnittsformen des Rundreflektors schematisch von unten gesehen.

Embodiments of the invention are shown in the drawing and described in more detail below. It shows:

FIG. 1

a reflector according to the invention seen in plan view from the outside;

FIG. 2

likewise in side view;

FIG. 3

a blank for the production of a round reflector according to FIG. 1 and 2 seen in plan view;

FIGS. 4 to 7

different cross-sectional shapes of the round reflector seen schematically from below.

In the drawing, a circular reflector for electromagnetic radiation, in particular for light beams for lighting purposes is shown. The reflector is, as clearly in figure 3 shown, from a Ronde of very thin aluminum sheet, which is anodized on the reflective side. From a middle part 1 of the Ronde go star-shaped strip-like fingers 2 radially, which are bent in a subsequent shaping operation to a reflector shape, the vividly in FIG. 1 and 2 is shown. Here are, as in particular from FIG. 1 and 2 it can be seen, the longitudinal edge edges of the fingers 2 arranged overlapping each other, so that no gaps arise. In addition, the fingers 2 are connected together at their free ends, in particular hooked by hooking elements 3. As in particular from FIG. 3 can be seen, the one longitudinal edge 4 of the finger 2 is radially directed, while the other longitudinal edge edge 5 is directed away from the radially directed edge 4, so that it covers the adjacent radially directed side longitudinal edge 4 of the adjacent finger 2 in the finished curved reflector.

In the embodiment according to FIG. 4 is a view shown in which the fingers are formed in cross-section flat. In the embodiment according to FIG. 5 the fingers are convex in cross-section. In the embodiment according to FIG. 6 the fingers are concave in cross-section. In the embodiment according to FIG. 7 the fingers are shaped in cross-section in the form of a linear angle profile, so that each one Triangle is formed. Preferably, the fingers are connected via a tangentially directed to the middle part 1 bending edge 6 to the central part 1.

In the embodiments, 24 fingers are connected to the middle part 1, which are distributed uniformly on the circumference of the middle part 1 and have the same width.

The invention is not limited to the embodiments, but in the context of the disclosure often variable.

All new, disclosed in the description and / or drawing single and combination features are considered essential to the invention.

Claims (20)

Round reflector for electromagnetic radiation, in particular for light beams for lighting purposes, characterized in that the reflector consists of a plate made of aluminum sheet, which is anodized on the reflective side, projecting from a central part (1) of the Ronde star-shaped strip-like fingers (2) are bent to a reflector shape. Reflector according to claim 1, characterized in that the longitudinal edge edges of the fingers (2) are arranged overlapping each other. Reflector according to claim 1 or 2, characterized in that the fingers (2) are interconnected at their ends. Reflector according to claim 3, characterized in that the adjacent fingers (2) by screw connection means, plug connection means, latching connection means are interconnected or riveted or welded, wherein the connecting means or the connection preferably on the central part (1) facing away from the end region of the fingers (2). is provided. Reflector according to one of claims 1 to 4, characterized in that the one side longitudinal edge (4) of the fingers (2) radially directed and the other side longitudinal edge (5) has one of the radially directed edge (4) directed away curvature, which covers the adjacent radially directed side longitudinal edge (4) of the adjacent finger (2) in the finished curved reflector. Reflector according to one of claims 1 to 5, characterized in that the fingers (2) are formed flat in cross section. Reflector according to one of claims 1 to 5, characterized in that the fingers (2) are convex in cross section. Reflector according to one of claims 1 to 5, characterized in that the fingers (2) are concave in cross section. Reflector according to one of claims 1 to 5, characterized in that the fingers (2) in cross-section form a linear angle profile, for example a triangle. Reflector according to one of claims 1 to 9, characterized in that connect the fingers (2) via a tangentially directed to the middle part bending edge (6) to the central part (1). Reflector according to one of claims 1 to 9, characterized in that connect the fingers (2) via a bending edge of the central part (1) with the tangent to the Middle part (1) includes a shallow angle. Reflector according to one of claims 1 to 11, characterized in that connect to the central part (1) at least 6 and at most 24 fingers (2), which are evenly distributed over the circumference of the central part (1). Reflector according to one of claims 1 to 12, characterized in that each finger (2) is faceted in its surface. Reflector according to one of claims 1 to 12, characterized in that each finger (2) forms a free-form surface. Reflector according to one of claims 1 to 14, characterized in that the free ends of the fingers (2) form an angled flange, wherein the flanges of all fingers (2) in the finished bent state of the fingers (2) form a circumferential annular flange edge. Reflector according to one of claims 1 to 15, characterized in that the fingers (2) are arranged alternately overlapping each other with the side longitudinal edge edges. Reflector according to one of claims 1 to 15, characterized in that the fingers (2) are arranged with their adjacent side longitudinal edge edges in abutment. Reflector according to one of claims 1 to 17, characterized in that the reflector consists of one-piece pre-anodized sheet metal, in particular aluminum sheet, wherein the surface acting as a reflector is high-luster rolled, finished, brushed, brushed or satin-brushed. Reflector according to one of claims 1 to 18, characterized in that the fingers (2) are formed as from the central part (1) to the free end widening trapezoids. Reflector according to one of claims 1 to 19, characterized in that the central part (1) is preferably perforated centrally and in the perforation of an electrical blasting agent is used.

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