DE102012211938B4 - Reflector with flat reflector surfaces - Google Patents

Abstract

Reflector (1) having a) an octagonal light exit surface (6) and b) a rectangular roof surface (2) opposite the light exit surface having a central passage opening (3) for connecting the illuminant (8) and c) eight side surfaces (I, II, III, IV, V, VI, VII and VIII), which extend from the roof surface to the light exit surface and are increasingly bent parallel to the octagonal edges to form a plurality of flat reflector surfaces (4) to form creases along fold lines, where d) the on the long edges of the roof surface rectangle adjoining side surfaces (I, II) form a first reflector trough, from which the light from a light source arranged below the roof surface at a first narrow angle on both sides of the longitudinal plane of symmetry of the reflector trough and across it can be emitted at a larger angle, so that a first elongated illuminated area (A) with central illuminance kemaximum can be generated, and e) the adjoining the short edges of the roof surface rectangle side faces (III, IV) each form a semi-reflector trough, from each of which the light from the light source on the side surface with respect to its center plane opposite half of the first illuminated surface can be emitted, such that two illuminated areas (B) covering the first elongated illuminated area can be produced with illuminance maxima spaced apart in the longitudinal direction of the first illuminated area, and f) the intermediate areas (V, VI, VII, VIII) adjoining the corners of the roof area rectangle each form half reflectors, from which the light from the bulb can be emitted in each case on the diagonally opposite part of the first illuminated surface, so that the first illuminated surface covering four illuminated surfaces (C) with rectangular arranged spaced illuminance magnitudes can be generated.

Description

The present invention relates to a reflector for producing a one-directional illumination surface with flat reflector surfaces. In particular, a reflector which can be produced simply by shaping the outline of a plurality of flat surfaces of reflector material and producing mutually angled reflector surfaces by folding along the boundary lines of the reflector surfaces and connecting the plurality of folded surfaces.

Reflectors with a large number of reflector surfaces, which have a convex or concave surface in order to produce a desired emission characteristic, illumination characteristic, glare suppression and / or color mixture, are known per se; see, for. B. US 2009/0201677 A1 . US 2008/0062682 A1 and DE 691 30 738 T2 , Such reflectors are made by molding a sheet of aluminum or other easily deformable metal to a die, which is the internal shape of the reflector. The manufacturing process is relatively expensive. The US 2008/0185605 A1 concerns one

Luminaire with a large number of juxtaposed rotationally symmetrical reflectors for LED light sources. The US Pat. No. 6,042,250 relates to a symmetrical with respect to 90 ° rotation light for greenhouses with to the light exit surface towards flared reflector surfaces.

From the US 2011/0044037 A1 is a luminaire with LED light sources and known from refractive material collimator known, which may have a concave rectangular light entrance surface and an octagonal light exit surface known.

From the DE 698 08 329 T2 is a foldable lamp with a light scattering unit with a arranged below the lamps rectangular light inlet opening and covered by a light scattering tissue octagonal light exit surface known.

Finally, the reveals JP 2006-221 939 A a luminaire with a circulating fluorescent tube, within which a laterally obliquely radiating reflector is located, wherein the fluorescent tube may be rectangular and the reflector may also be rectangular.

The object of the invention is to provide an easily manufacturable reflector for producing an elongated, substantially rectangular illuminated area with rounded corners available.

• a) einer achteckigen Lichtaustrittsfläche und
• b) einer der Lichtaustrittsfläche gegenüberliegenden rechteckigen Dachfläche mit einer zentralen Durchführungsöffnung für den Anschluss des Leuchtmittels sowie
• c) acht Seitenflächen, die sich von der Dachfläche zur Lichtaustrittsfläche erweitern und zunehmend parallel zu den Achteckkanten unter Ausbildung einer Vielzahl von ebenen Reflektorflächen unter Ausbildung von Knickkanten bzw. Knicklinien abgeknickt sind, wobei
• d) die an die langen Kanten des Dachflächenrechtecks anschließenden Seitenflächen eine erste Reflektorwanne bilden, aus der das Licht von einem unterhalb der Dachfläche anordenbaren Leuchtmittel in einem ersten schmalen Winkel beidseitig zur Längssymmetrieebene der Reflektorwanne und quer dazu in einem größeren Winkel abgestrahlt wird, so dass eine erste langgestreckte beleuchtete Fläche mit zentralem Beleuchtungsstärkemaximum erzeugbar ist, und
• e) die an die kurzen Kanten des Dachflächenrechtecks anschließenden Seitenflächen jeweils eine Halbreflektorwanne bilden, aus denen jeweils das Licht von dem Leuchtmittel auf die der Seitenfläche bezüglich ihrer Mittelebene gegenüberliegende Hälfte der ersten beleuchteten Fläche abgestrahlt wird, so dass zwei die erste langgestreckte beleuchtete Fläche überdeckende zweite beleuchtete Flächen mit in Längsrichtung der ersten beleuchteten Fläche beabstandeten Beleuchtungsstärkemaxima erzeugbar sind, und

die dazwischen liegenden, an den Ecken des Dachflächenrechteckes anschließenden vier Seitenflächen jeweils Halbreflektoren bilden, aus denen das Licht von dem Leuchtmittel jeweils auf den diagonal gegenüberliegenden Teil der ersten beleuchteten Fläche abgestrahlt wird, so dass eine, die erste beleuchte Fläche überdeckende dritte beleuchtete Flächen mit rechteckig angeordneten beabstandeten Beleuchtungsstärkemaxima erzeugbar ist.The invention accordingly provides a reflector

• a) an octagonal light exit surface and
• b) one of the light exit surface opposite rectangular roof surface with a central opening for the connection of the light source and
• c) eight side surfaces which extend from the roof surface to the light exit surface and are increasingly bent parallel to the octagonal edges to form a plurality of planar reflector surfaces to form creases or fold lines, wherein
• d) the side surfaces adjoining the long edges of the roof surface rectangle form a first reflector trough, from which the light is radiated from a light source which can be arranged below the roof surface at a first narrow angle on both sides to the longitudinal plane of symmetry of the reflector trough and at a larger angle, so that a first elongated illuminated area with central illuminance maximum is generated, and
• e) the side surfaces adjoining the short edges of the roof surface rectangle each form a half-reflector trough from which the light from the luminous means is radiated onto the half of the first illuminated surface opposite the side surface with respect to its center plane, so that two second surfaces covering the first elongated illuminated surface Illuminated surfaces are generated with spaced in the longitudinal direction of the first illuminated surface illuminance maximums, and

the intervening, adjoining at the corners of the Dachflächen rectangle four side surfaces each form semi-reflectors from which the light is emitted from the light source respectively on the diagonally opposite part of the first illuminated surface, so that one, the first illuminated surface covering third illuminated surfaces with rectangular arranged spaced illuminance maxima can be generated.

Preferably, each side surface (= connecting surface between the roof surface and the light exit surface) of the reflector from 3 to 6 reflector surfaces, particularly preferably 4 reflector surfaces, which are separated by corresponding fold edges.

The corners of the light exit surface are preferably on an oval or an ellipse. The roof surface preferably has the shape of a rectangle with the long extension parallel to the short extension of the oval or the ellipse.

The intersections of the fold lines of a joint surface with a plane perpendicular to the joint surface, which is the axis of the center Includes lead-through, are preferably on a parabola, the apex is above the roof surface.

More preferably, the parabola focal points of the two adjoining the long edges of the roof surface reflector surfaces coincide and the parabola focal points of the adjacent to the short edges or corners reflector surfaces are spaced apart.

Preferably, the narrow opening angle of the radiatable light for 50% of the illumination intensity should be about 8 to 25 °, more preferably between 12 and 20 °. The larger opening angle can be 1.5 to 3 times as large, more preferably 1.8 to 2.5 times as large as the narrow one.

The opening angle of the light radiated from the two of the connecting surfaces adjoining the narrow edges of the roof surface rectangle can be approximately the narrow opening angle, in particular 0.8 to 1.2 times the narrow opening angle, or even 0.9 to 2 in both directions 1.1 times the narrow opening angle correspond. This opening angle may be asymmetrical to its median plane in the longitudinal direction of the roof rectangle.

The opening angle of the light emitted by the four semi-reflectors adjoining the corners of the roof surface rectangle in the longitudinal direction of the roof surface rectangle preferably corresponds approximately to the narrow opening angle. The opening angle across is about half as large.

By adding the illuminance levels of the reflector surfaces thus results in an approximately rectangular illuminated area with rounded corners. The indirectly illuminated surface thus produced after reflection on the reflector is also superimposed by the light directly from the light source while also lightening the environment.

The reflector according to the invention is preferably made of folded sheets, wherein one of the sheets has the contour of the roof surface with two parallel edges of the roof surface associated connection surfaces and two further sheets each having the contour of three mutually adjacent connection surfaces composed.

The invention furthermore relates to a luminaire which has a reflector according to the invention.

The shape and arrangement of the light source within the reflector, the illumination intensity distribution can be further influenced. The luminous means is preferably arranged such that the coincidentary parabola focal point defined above lies within the luminous means.

An elongated bulb, such as a high pressure lamp, may be oriented so that its longitudinal axis coincides with the axis of the central opening of the roof surface or is aligned parallel to the long edge or the short edge of the roof surface.

More preferably, the lighting means has a maximum extent which is smaller than or equal to the smallest extent of the reflector surfaces.

The invention furthermore relates to a method for producing an elongated illuminated area, wherein one or more of the luminaires are arranged at a distance so that the illuminated areas of adjacent luminaires according to the invention overlap, preferably in the range of below 25 to 50% of their respective illumination intensity.

• – Formen der Kontur eines ebenen Reflektorbleches, das die rechteckige Dachfläche mit zwei an zwei parallele Kanten der Dachfläche anschließende Verbindungsflächen darstellt, sowie zweier Bleche mit Konturen, die die an eine andere Kante und die beiden benachbarten Ecken der Dachfläche anschließenden Verbindungsflächen darstellen. Das Formen der Konturen kann durch Stanzen, Laserschneiden, oder andere gebräuchliche Verfahren erfolgen.
• – Knicken der konturierten Reflektorbleche entlang den Begrenzungen der einzelnen Reflektorflächen mit einem entsprechenden Werkzeug. Im Falls, dass anstelle von Metallblech ein reflektierend beschichtetes Kunststoffblech eingesetzt wird, muss das Biegen unter Zufuhr von Wärme erfolgen.
• – Zusammensetzen der drei Reflektorteile. Hierzu können an eines oder mehrere Teile Laschen an die Konturen angeformt sein, die in entsprechende Ösen oder Langlöcher des damit zu verbindenden Teils eingeführt und umgebogen werden. Denkbar ist auch, dass die Reflektorteile in einem Gehäuse mit entsprechenden Einrichtungen zusammen gehalten werden.

The invention further provides a process for producing the reflector according to the invention with the following process steps:

• - Shapes the contour of a flat reflector sheet, which represents the rectangular roof surface with two adjacent to two parallel edges of the roof surface connecting surfaces, and two sheets with contours, which represent the adjoining another edge and the two adjacent corners of the roof surface connecting surfaces. The shaping of the contours can be done by punching, laser cutting, or other common methods.
• - Bending the contoured reflector sheets along the boundaries of the individual reflector surfaces with a corresponding tool. In the case where a reflective coated plastic sheet is used instead of metal sheet, the bending must be done with the application of heat.
• - Assembling the three reflector parts. For this purpose, tabs may be integrally formed on the contours on one or more parts, which are inserted and bent into corresponding eyelets or slots of the part to be connected thereto. It is also conceivable that the reflector parts are held together in a housing with corresponding facilities.

The invention will be explained in more detail with reference to the accompanying figures. Like reference numerals in the various figures indicate like elements.

1 shows a plan view of an embodiment of the reflector according to the invention;

2 shows a vertical half-section along a plane perpendicular and transverse to the long edge of the roof surface;

3 shows a corresponding section perpendicular and transverse to the short edge of the roof surface;

4 shows a corresponding section perpendicular to the roof surface and the bending edges of the adjoining to a corner of the roof surface connecting surface; 5 explains the illumination intensities emitted by the eight connection surfaces;

6 and 7 show the contours and crease lines of the sheets of which the reflector is composed.

1 shows the reflector 1 with the rectangular roof area 2 which has a central opening 3 for the bulb or the socket for the bulb has. At each of the long and short edges and the corners of the roof surface close to side surfaces, which in the illustrated embodiment of four mutually kinked reflector surfaces 4 consist. The outer edges of the side surfaces I . II . III . IV . V . VI . VII and VIII form an octagon, which is the light exit surface 6 (please refer 2 - 4 ) limited. In the illustrated embodiment, the outer octagon is disposed within a circle, with the outer circular sections 5 run parallel to the roof surface and serve as a support in a holder, not shown, of the reflector in a housing.

2 shows the half-section BB through the reflector according to 1 , The creases between the lines of intersection of the reflector surfaces 4 lie on a parabola whose focal point F is on the axis 7 the central opening 2 lie. The illustrated embodiment shows an elongated bulb 8th in the direction of the axis 7 is arranged symmetrically to the focal point F. To the reflector surfaces 4 in each case the mid-perpendiculars are shown. Furthermore, the marginal rays, which are reflected at the second reflector surface seen from the light exit surface, indicated by thin lines.

3 shows a corresponding half-section AA through the reflector according to 1 and 4 shows a corresponding half-section CC.

5 explains qualitatively the illumination intensities generated by the reflectors of a side surface, whereby the total illumination intensity produced by the reflector results from telescoping of the illuminated surfaces A, B and C. 6 explains the illumination intensities across it.

7 and 8th explain the preparation of the reflector according to the invention. 7 shows a flat sheet whose contour is the roof surface 3 with the central implementation 3 as well as the side surfaces I and II contains. 8th shows a flat sheet, the side surfaces V . VI and VII contains.

Claims (9)

Reflector ( 1 ) with a) an octagonal light exit surface ( 6 ) and b) a rectangular roof surface opposite the light exit surface ( 2 ) with a central opening ( 3 ) for the connection of the illuminant ( 8th ) as well as c) eight side surfaces ( I . II . III . IV . V . VI . VII and VIII ), which extend from the roof surface to the light exit surface and increasingly parallel to the octagonal edges to form a plurality of flat reflector surfaces ( 4 ) are bent along fold lines with the formation of creasing edges, wherein d) the side surfaces adjoining the long edges of the roof surface rectangle ( I . II ) form a first reflector trough, from which the light from a light source arranged below the roof surface can be emitted at a first narrow angle on both sides to the longitudinal symmetry plane of the reflector trough and transversely thereto at a larger angle, so that a first elongated illuminated surface (A) with central illuminance maximum can be generated, and e) the adjoining the short edges of the roof rectangle side surfaces ( III . IV ) each form a half-reflector trough, from each of which the light from the lamp on the side surface with respect to its center plane opposite half of the first illuminated surface can be emitted, so that two the first elongated illuminated surface covering second illuminated surfaces (B) with in the longitudinal direction of the first Illuminance intensities spaced apart from the illuminated surface can be generated, and f) the intervening lateral surfaces (at the corners of the roof surface rectangle) (FIG. V . VI . VII . VIII ) each form half reflectors, from which the light from the illuminant can be emitted onto the diagonally opposite part of the first illuminated surface, so that the four illuminated surfaces (C) covering the first illuminated surface can be generated with rectangularly spaced illuminance maxima. Reflector according to claim 1, wherein the corners of the light exit surface ( 6 ) lie on an oval or an ellipse and the roof surface ( 2 ) the form of a Rectangles with long extension parallel to the short extension of the oval or ellipse. Reflector according to claim 1 or 2, wherein the intersections of the crease lines with a to the subsequent reflector surfaces ( 4 ) vertical plane representing the axis of the central opening ( 7 ), lying on a parabola whose apex lies above the roof surface. Reflector according to claim 3, wherein the parabola focal points of the two parabolas, the reflector surfaces adjoining the long edges of the roof surface ( I . II ) coincide and the parabola focal points of the two parabolas, the short edges or corners adjoining reflector surfaces ( III . IV ), are spaced from each other. Reflector according to one of claims 1 to 4, composed of folded sheets, wherein one of the sheets the contour of the roof surface with two parallel edges of the roof surface associated side surfaces ( I . II ) and two further sheets each have the contour of three adjacent side surfaces ( V . IV . VII ; VI . III . VIII ) exhibit. Luminaire with a reflector according to one of claims 1 to 5, wherein the luminous means ( 8th ) is arranged so that the coincident parabola focal point (F) is within the luminous means. Luminaire according to claim 6, wherein the luminous means ( 8th ) has a longitudinal extent with the axis ( 7 ) of the reflector coincides. Luminaire according to claim 6 or 7, wherein the luminous means has a maximum extent which is less than or equal to the smallest extent of the reflector surfaces. A method for producing an elongate illuminated area wherein one or more of the lamps according to any one of claims 6 to 8 are arranged side by side.

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