EP2535639A1 - Light reflector and method and device for its manufacture - Google Patents

Light reflector and method and device for its manufacture Download PDF

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Publication number
EP2535639A1
EP2535639A1 EP11170396A EP11170396A EP2535639A1 EP 2535639 A1 EP2535639 A1 EP 2535639A1 EP 11170396 A EP11170396 A EP 11170396A EP 11170396 A EP11170396 A EP 11170396A EP 2535639 A1 EP2535639 A1 EP 2535639A1
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EP
European Patent Office
Prior art keywords
curvature
facet
radii
r1
r2
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11170396A
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German (de)
French (fr)
Inventor
Andreas Möcking
Kai Elfmann
Ioannis Laftsidis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JORDAN REFLEKTOREN GmbH and Co KG
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JORDAN REFLEKTOREN GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JORDAN REFLEKTOREN GmbH and Co KG filed Critical JORDAN REFLEKTOREN GmbH and Co KG
Priority to EP11170396A priority Critical patent/EP2535639A1/en
Publication of EP2535639A1 publication Critical patent/EP2535639A1/en
Application status is Withdrawn legal-status Critical

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/048Optical design with facets structure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/06Optical design with parabolic curvature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/09Optical design with a combination of different curvatures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/22Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors

Abstract

The light reflector (1) has a hollow, shell-shaped curved reflector body (2) with an inner reflection surface (4) and an inner diameter that is increased in the direction of longitudinal central axis between a rear, small light-inlet opening (8) and a front-large light-outlet opening (10). The fecet surfaces (14) are designed in a partial area of the reflection surfaces with respect to the size of one of its radii of curvature such that the fecets (12) opposite-lying in annular group (A) have regularly alternately rising and falling again radii of curvature. An independent claim is included for a device for manufacturing a light reflector.

Description

  • The present invention initially relates, according to the preamble of claim 1, to a luminaire reflector consisting of a hollow, cup-shaped, in particular rotationally symmetrical, paraboloidal reflector body having an inner reflection surface and having a rear, smaller illuminant opening and a front in the direction of its longitudinal center axis , the larger light exit opening increasing inner diameter, wherein the reflection surface is divided into a plurality of structured facets, each having a curved at least in a surface direction with a radius of curvature facet surface, and wherein the facets in a grid-like structure on the one hand in the circumferential direction around the longitudinal central axis in concentric ring groups and on the other hand are arranged in radially symmetry between the lamp opening and the light exit opening arranged column groups.
  • Furthermore, the invention according to the preamble of claim 10 also relates to an apparatus for producing such a luminaire reflector, consisting of a molded press body with a the inside of the produced reflector body adapted negative contour with corresponding facet negative surfaces in a lattice-like structure on the one hand in the circumferential direction around the Longitudinal axis around are arranged in concentric ring groups and on the other hand in radially symmetric column groups.
  • A luminaire with a reflector element of the generic type is in the EP 1 632 713 B1 described. Due to the two-dimensional, in particular spherically curved surfaces of the individual facets - there called "segments" - a scattering (fanning) to equalize the light emitted by a lamp for a more homogeneous illumination is to be achieved. Specifically, it is intended that On the one hand, the radii of curvature of the segments between an inner vertex area of the reflector element and the outer light exit opening should also increase with increasing distance from the vertex area. On the other hand, the segments lying one behind the other in the circumferential direction within circular ring groups should each have identical radii of curvature. The known reflector element should preferably consist of pressed aluminum, wherein an aluminum disk, that is a circular disk, is moved along a rotating pin (press molded body), so that the pin (male) is imaged in the aluminum blank. However, experience has shown that this production by forming in the spinning process has the disadvantage of very large manufacturing tolerances. In particular in the area of the individual facets, large deviations between the actual desired curvature radii on the one hand and the curvature radii actually present on the finished pressed reflector body on the other hand are unavoidably inevitable between the curvature radii specified with reverse negative curvature. Therefore, it is at least questionable whether the increasing from inside to outside and circumferentially same radii according to EP 1 632 713 B1 in practice even feasible, ie reproducible produced in the pressing process.
  • The document EP 1 890 079 A1 describes a reflector, in particular for gas discharge lamps. Also, this known reflector is formed as a faceted reflector with a plurality of facets, which are arranged in radial and circular columns or rows and formed as cylindrical facets and / or spherical facets. The facets should be curved with radii which assume values of between 9.1 mm and 150 mm, wherein facets with the same radii in each case should be arranged in a spiral such that the facets within each column or row are periodically and in accordance with a sine curve. and lose weight. This means that the radii successively increase and decrease in each case over a plurality of facets lying one behind the other in a row / column, which in the case of the radial gaps is thus in regions of the prior art according to the aforementioned EP 1 632 713 B1 equivalent. However, in contrast, the Reflector according to EP 1 890 079 A1 made of glass with a reflective coating. Therefore, this is not the previously discussed manufacturing problem.
  • The present invention is based on the object to provide a luminaire reflector of the generic type described above, which ensures an optimal, homogeneous light emission largely independent of the manufacturing tolerances. In addition, a correspondingly optimized device for producing the reflector according to the invention is to be created.
  • This is achieved by a reflector having the features of the independent claim 1 or by a device according to claim 10. Advantageous embodiments are contained in the dependent claims.
  • Accordingly, the luminaire reflector according to the invention is characterized in that the facet surfaces are at least within a partial area of at least 50% of the reflection surface - based on the radial and axial extent between the illuminant opening and the light exit opening - in terms of size at least one of its radii of curvature designed in that the facets one behind the other in each ring group, individually or in subgroups of at least two directly adjacent similar facets, regularly alternately ascending and descending - or descending and rising again (depending on whether a smaller or larger radius of curvature is assumed) - have radii of curvature. This means that the radii of curvature between individual, directly adjacent facets or between directly adjacent subgroups, each with at least two directly adjacent, with respect to their radii similar facets in the circumferential direction alternately larger and smaller or smaller and larger. This results in each radii differences, which - analogous to a mathematical "alternating series" - alternately changing signs (+/-) have. Thus, in the circumferential direction z. B. in each case a larger radius and a smaller radius alternate. According to the invention, it is thus a regularly changing radius-size profile between directly adjacent single facets or facet subgroups. However, the radii differences resulting from the alternately different radii can differ in their amounts from one another, so that they are qualitatively at least with a minimum value existing differences and not necessarily also quantitatively exactly defined differences.
  • Each with an increasing distance from the illuminant opening to the light exit opening, d. H. radially and axially from the inside to the outside within each column group successive facets can basically be formed arbitrarily with respect to their radii of curvature. Thus, the successive facets in the column groups in this direction - apart from production-related tolerance deviations - substantially the same, from inside to outside increasing or decreasing or preferably also individually or in subgroups regularly alternately rising and falling again - or falling and rising again (depending on whether starting with a larger or smaller radius) - have radii of curvature.
  • In the case of the lattice-like or spider-web-like structure of the facets, these are preferably distributed with respect to their alternating larger and smaller radii of curvature within the ring and column groups in the manner of the black and white fields of a chessboard. This results in a particularly homogeneous light emission.
  • In order to ensure the alternating radii differences even in the finished pressed reflector body, it is preferably provided in the device according to the invention that - at least within a corresponding subregion of at least 50% of the outer surface - two directly adjacent in a ring group or a column group and with respect to their radii of curvature different facet negative surfaces are designed such that the respective smaller radius of curvature is at least 25% smaller than the respective larger radius of curvature, ie the respective smaller radius corresponds to a maximum of 75% of each larger radius. If, for example, the larger radius should be 10 mm, the smaller radius with a maximum of 7.5 mm would be predefined. With this minimum difference of 25%, in the case of the reflectors produced using the device according to the invention, ie, reflectors pressed onto the molded article according to the invention, the alternately increasing and decreasing radii profile can be reproducibly ensured despite the manufacturing tolerances.
  • From the curvature radii alternatingly changing their size according to the invention, a very good light uniformity results through a varying light scattering in the differently curved surface areas of the facets.
  • In the following description, the invention will be described in detail with reference to a preferred embodiment and some embodiments. Show it:
  • Fig. 1
    a view in the axial direction in the interior of a luminaire reflector according to the invention,
    Fig. 2
    an axial section in the diametric section plane II-II according to Fig. 1 in a simplified in the inner region of the reflection surface representation,
    Fig. 3
    a schematic, enlarged perspective view in the region of a facet in a first embodiment (minimum version with simple curvature),
    Fig. 4
    a view analogous to Fig. 3 in a preferred embodiment (double curvature),
    Fig. 5
    a perspective view of an example of a pressure-molded body for the production of the reflector,
    Fig. 6
    an alternative embodiment of the reflector according to the invention in an axial view in the interior analogous to Fig. 1 and
    Fig. 7
    an axial plan view (corresponding to the direction of view arrow VII in Fig. 5 ) on a molded article for the reflector design Fig. 6 ,
  • In the various figures, the same parts are always provided with the same reference numerals.
  • For the following description, it is expressly emphasized that the invention is not limited to the exemplary embodiments and not all or several features of described combinations of features, but each individual feature of the / each embodiment can also be separated from all other partial features described in connection therewith and also have an inventive meaning in combination with any features of another embodiment as well as independent of the claim back relationships.
  • An inventive luminaire reflector 1 consists of a hollow, cup-shaped arched reflector body 2 with an inner reflection surface 4. The reflector body 2 has a seen in the direction of a longitudinal central axis 6 of a rear, smaller illuminant opening 8 in the radial and axial direction up to a front, larger Light exit opening 10 increasing, each measured perpendicular to the longitudinal central axis 6 inner diameter. Preferably, the reflector body 2 is rotationally symmetrical parabolic. In the area of the illuminant opening 8, an illuminant, not shown, can be arranged such that the light emitted by it is radiated outwardly at least partially from the light exit opening 10 by reflection via the reflection surface 4. As a light source, a flat LED element can advantageously also be arranged in the plane of the illuminant opening 8 or parallel thereto.
  • At least a major part of the reflection surface 4 is subdivided into a plurality of structured facets 12, which in Fig. 2 are shown only partially for simplicity. Each facet 12 has an at least in a surface direction curved facet surface 14.
  • This will be on Fig. 3 reference is made, according to which the facet surface 14 is curved or curved in only one surface direction illustrated by a dash-dotted line of curvature X with a radius of curvature R1. The curvature line X runs with the same curvature R1 over the facet surface 14. This only single curved facet 12 can also be referred to as a cylindrical facet because it corresponds to the shape of a section of a cylindrical surface.
  • In the preferred embodiment according to Fig. 4 but is the facet surface 14 - in addition to the curvature in the surface direction X - curved in a second, illustrated by a dashed line of curvature Y surface direction, namely with a radius of curvature R2. The radii R1 and R2 may be the same or different. The curvature lines X, Y expediently run perpendicular to each other in the center over the facet surface 14. The same radii R1 = R2 are spherical facets, wherein the facet surfaces 14 are formed as spherical sections and therefore can also be referred to as spherical facets.
  • alternative to Fig. 3 In principle, the facet surface 14 can also be curved as a cylindrical facet only in the surface direction Y.
  • The facets 12 are in a grid-like, in particular spider-web-like grid structure - see in particular the axial view in Fig. 1 - On the one hand in the circumferential direction in concentric, with respect to the longitudinal central axis 6 coaxial ring groups A and on the other hand in the radial and axial direction in radially symmetric distributed over the circumference column groups B. each Column group B extends according to Fig. 1 at least partially between the inner bulb opening 8 and the outer light exit opening 10 and in the circumferential direction over an angle a, which is divided by the circumference of 360 ° divided by the number of column groups B. By this embodiment, each facet 12 is approximately trapezoidal in plan view (see Fig. 1 ). In addition, the first curvature line X preferably extends with the first curvature radius R1 of each facet surface 14 in a radial or diametrical plane defined by the longitudinal center axis 6. The second curvature line Y of each facet surface 14 extends with the second radius of curvature R2 in the circumferential direction of the reflector body 2 and thus in a plane perpendicular to the longitudinal central axis 6.
  • As already mentioned, the two radii of curvature R1, R2 of each facet surface 14 can be of different sizes. Preferably, however, the facet surfaces 14 are each spherically curved, wherein the two radii of curvature R1, R2 are the same size.
  • According to the invention, at least in a partial region of the reflection surface 4 of at least 50%, based on the axial and radial surface extension between the openings 8 and 10, it is provided that the facet surfaces 14 are dimensioned with respect to the size of at least one of their radii of curvature R1 and / or R2 are that within each ring group A seen in the circumferential direction about the longitudinal center axis 6 around the radii of curvature R1 and / or R2 regularly alternately different sizes R1.1, R1.2 and / or R2.1, R2.2 have. In principle, the difference in radii can optionally refer to R1 with R1.1 and R1.2 and / or R2 with R2.1 and R2.2. In this case, all individual directly adjacent facets 12 may have alternately different radii. But it can also subgroups of at least two to z. B. four each directly adjacent facets be formed with substantially similar curved facet surfaces 14, wherein regularly alternating radii are available from subgroup to subgroup.
  • In a preferred embodiment of the invention, the radii of curvature R1 and / or R2 are additionally designed such that they also within each column group B individually or in subgroups regularly alternately differing sizes R1.1, R1.2 and / or R2.1, R2.2 exhibit.
  • In the cobweb-like facet structure according to Fig. 1 For example, the different facets 12 with respect to the radii of curvature are preferably arranged individually alternately both in the ring groups A and in the column groups B in such a way that the overall result is a checkerboard-like distribution.
  • In a further preferred embodiment, the facet surfaces 14 of the reflector body 2 are convexly curved toward the interior in the direction of the longitudinal central axis 6. Alternatively, however, concave curvatures would also be possible.
  • The reflector 1 or the reflector body 2 is produced in one piece in a forming-pressing process from an initially flat, circular sheet metal blank by the sheet metal blank to form the structured reflection surface 4 with rotation about the longitudinal central axis 6 to an exemplary in Fig. 5 shown negative-pressure mold or male, ie a pressure-molded body 16 is pressed. The pressure-molded body 16 has a negative contour corresponding to the interior of the reflector body 2, wherein corresponding, preferably concavely curved, facet negative surfaces 18 are structured on its outer surface. Corresponding to the lattice network structure of the reflector body 2, the facet negative surfaces 18 of the pusher body 16 are also arranged in a crenellated structure in the circumferential direction in concentric ring groups A 'and in the axial and radial direction in radially symmetric column groups B'. According to the invention, the facet negative surfaces 18 of the molded article body 16 are designed at least in a subregion of at least 50% of the surface extent in the radial and axial directions with respect to the size of at least one of their radii of curvature R1, R2` in such a way that viewed in the circumferential direction, ie inside each Ring group A ', the radii of curvature individually or in subgroups regularly have different sizes alternately. Preferably, the radii of curvature also in the axial and radial direction, ie within each column group B ', regularly on or individually in groups differing sizes. Preferably, the facet negative surfaces 18, which differ in their radii of curvature, may be distributed within the grid-like structure in the manner of the black and white fields of a chess board. In a preferred embodiment, in each case two directly adjacent and with respect to their radii of curvature different facet negative surfaces 18 are designed such that the respective smaller radius of curvature is smaller by at least 25% than the respective larger radius of curvature, so that the respective smaller radius is at most 75% of the larger radius , In this case, the facet negative areas 18 within each column group B 'can alternatively also be formed with the same or increasing or decreasing radii of curvature from inside to outside. In the case of the pressed reflector body 2 produced with this device, however, the radii can deviate within the scope of the manufacturing tolerance.
  • At the in Fig. 1 and 2 illustrated embodiment, in the interior, adjacent to the bulb opening 8 region z. B. two ring groups with facets 12a be arranged with flat, flat facet surfaces. This is followed by ring groups A with radii alternating according to the invention in the circumferential direction (eg R2.1 and R2.2) and preferably also radii changing in addition from group A to group A (eg R1.1 and R1.2) at. Here, the radii R1.1 and R2.1 can be larger and the radii R1.2 and R2.2 smaller. For example, the larger radius is 27 mm and the smaller radius is 19 mm.
  • Alternatively, for example, an embodiment may be provided, wherein the smaller radii are 10 mm and the larger radii 17 mm.
  • The statements are only to be understood as examples and do not limit the invention. In addition, the radii mentioned refer because of the unavoidable Manufacturing tolerance, in particular to the spinning mold; the reflector body 2 may differ within the manufacturing tolerance of the radii mentioned.
  • In addition, it must be expressly mentioned that due to the described material deformation in the pressing process, the facet curvatures can deviate in cross section from an ideal circular arc shape, so that they do not have continuous, uniform, uniform radii of curvature over the curvatures. Rather, it is more about different, irregularly curved with several different radii of curvature free-form surfaces for the radii of curvature can not be measured directly, but must be averaged by approximating a circular arc shape accordingly, and then to determine the radius of curvature of the approximate circular arc can. In practice, the radii of curvature are determined in particular as follows:
  • First, the manufactured reflector body 2 is measured optically three-dimensional, with a measuring device, which is under the name "ATOS III SO 4 M" by the company GOM mbH (Society for optical metrology mbH in Braunschweig) is available. In the version SO (= small objects), this device is particularly suitable for measuring small objects - and thus also for the reflector according to the invention. It is an optical 3D digitizer or a 3D coordinate measuring machine that provides three-dimensional measurement data of a component by optical scanning. The meter is based on the triangulation principle with a digital stereo camera setup. Using imaging equations of the optics, independent 3D coordinates are automatically calculated for each camera pixel. As a result, not only individual points are determined, but the entire component geometry is recorded in a high-resolution point cloud. The polygonal mesh thus captured accurately describes the surface and geometry of the component. From this CAD data are generated.
  • For measuring the reflector according to the invention, a cut is made on the basis of the generated CAD data through the centers of the facets 12, in particular in each case Column group B is set to determine the respective radius R1. If R1 = R2, R2 does not need to be determined separately. In each facet cut, the device evaluates the following:
  1. a) target radius according to a given 3D CAD
  2. b) Measured facet-curvature shape (free-form surface)
  3. c) Determination of a "best fit radius" on the curved shape measured according to b)
  • In step c), a so-called "best-fit approximation" of a circular arc line to the measured free-form curve is automatically carried out with the mentioned device-based on an implemented software. The "best fit circular arc" is approximated to the determined curve shape so that deviations on average for all curve areas are minimized. The radius of curvature of the so-called "best-fit arc" is set as the facet radius of curvature (eg, R1).
  • The invention is not limited to the illustrated and described embodiments, but also includes all the same in the context of the invention embodiments. Thus, in the example described so far Fig. 1 to 5 Although the column groups B and B 'have a radial orientation in one view, ie the facets 12 of the reflector body 2 lying in each case in a common column group and thus correspondingly also the negative surfaces 18 of the press molded body 16 lie with their centers on each a in the axial view radially extending straight line (see Fig. 1 and 5 ). However, the term "grid-like facet structure" also includes, for example, embodiments such as in US Pat 6 and 7 illustrates, wherein the individual ring groups A and A 'from group to group by one in each case Fig. 6 with β 1 , until β 12 drawn circumferential offset against each other are rotated about the axis 6, so that the column groups B and B 'in the axial view - see 6 and 7 - Slightly inclined from the inside to the outside relative to the respective radial straight line and / or -. B. slightly spiral-like - curved. The respective circumferential offset β 1 to β 12 may, for. B. in the range of 0 ° to ± 4 °, ie from group to group optionally by 0 ° to 4 ° in one of the two opposite circumferential directions.
  • It is also expressly emphasized that the embodiments are not limited to all features in combination, but each individual feature can also be detached from all other features for an inventive step. Furthermore, the invention has hitherto not been limited to the combination of features defined in the respective independent claim, but may also be defined by any other combination of specific features of all individually disclosed individual features. This means that in principle virtually every individual feature of the respective independent claim can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. In this respect, the claims are to be understood merely as a first formulation attempt for an invention.
  • Claims (12)

    1. Luminaire reflector (1) consisting of a hollow, cup-shaped arched reflector body (2) with an inner reflection surface (4) and with a in the direction of its longitudinal central axis (6) between a rear, smaller illuminant opening (8) and a front, larger light exit opening (10) increasing inside diameter, wherein the reflection surface (4) is subdivided into a multiplicity of structured facets (12) each having a facet surface (FIG. 2C) curved in at least one surface direction (X and / or Y) with a radius of curvature (R1 / R2) 14), wherein the facets (12) in a grid-like structure on the one hand in the circumferential direction around the central longitudinal axis (6) in concentric ring groups (A) and on the other hand radially in symmetry between the illuminant opening (8) and the light exit opening (10) arranged column groups (B ) are arranged, characterized in that the facet surfaces (14) at least in a Teilbere I at least 50% of the reflection surface (4) with respect to the size of at least one of their radii of curvature (R1 and / or R2) are designed such that in each ring group (A) successive facets (12) individually or in sub-groups of at least two having directly adjacent similar facets (12) regularly alternately rising and falling again radii of curvature (R1 and / or R2).
    2. Luminaire reflector according to claim 1,
      characterized in that the facet surfaces (14) are at least in the subregion of at least 50% of the reflection surface (4) with respect to the size of at least one of its radii of curvature (R1 and / or R2) additionally designed such that the in each column group (B ) have consecutive facets (12) individually or in sub-groups of at least two directly adjacent similar facets (12) regularly alternately rising and falling again radii of curvature (R1 and / or R2).
    3. Luminaire reflector according to claim 1 or 2,
      characterized in that the facet surfaces (14) are curved in two mutually particularly vertical surface directions (X, Y), each having a radius of curvature (R1, R2).
    4. Luminaire reflector according to claim 3,
      characterized in that the facet surfaces (14) are each curved spherically, wherein the two radii of curvature (R1, R2) of each facet surface (14) are equal.
    5. Luminaire reflector according to claim 3,
      characterized in that the two radii of curvature (R1, R2) of each facet surface (14) are of different sizes.
    6. Luminaire reflector according to one of claims 1 to 5,
      characterized in that the facet surfaces (14) are convexly curved toward the interior of the reflector body (2).
    7. Luminaire reflector according to one of claims 1 to 6,
      characterized in that the facet surfaces (14) with the larger radii of curvature (R1.1 and / or R2.1) on the one hand and the facet surfaces (14) with the smaller radii of curvature (R1.2 and / or R2.2) on the other hand with respect to the ring groups (A) and the column groups (B) are arranged distributed in the manner of a checkerboard pattern.
    8. Luminaire reflector according to one of claims 3 to 7,
      characterized in that a first line of curvature (X) of each facet surface (14) extends in a radial or diametral plane of the reflector body (2) on which the longitudinal central axis (6) lies.
    9. Luminaire reflector according to one of claims 3 to 8,
      characterized in that a second curvature line (Y) of each facet surface (14) extends in the circumferential direction of the reflector body (2).
    10. Apparatus for producing a luminaire reflector (1) according to one of claims 1 to 9, comprising a press molded body (16) with a negative contour adapted to the interior of the reflector body (2) to be produced with corresponding facet negative surfaces (18) in a grid-like manner Structure on the one hand in the circumferential direction about the longitudinal central axis (6) around in concentric ring groups (A ') and on the other hand in radially symmetric column groups (B') are arranged,
      characterized in that the facet negative surfaces (18) are at least in a partial area of at least 50% of the outer surface of the pressure molded body (16) in terms of size at least one of its radii of curvature (R1 and / or R2 ') designed such that in the circumferential direction in each ring group (A ') successive facet negative surfaces (18) individually or in subgroups of at least two similar facet negative surfaces (18) regularly alternately rising and falling again radii of curvature (R1 `and / or R2') have.
    11. Device according to claim 10,
      characterized in that the facet negative surfaces (18) are at least in the subregion of at least 50% of the outer surface of the molded article (16) with respect to the size of at least one of its radii of curvature (R1 and / or R2 ') additionally designed such that the in each column group (B ') successive facet negative surfaces (18) individually or in subgroups of at least two similar facet negative surfaces (18) regularly alternately rising and falling again radii of curvature (R1 `and / or R2') have.
    12. Device according to claim 10 or 11,
      characterized in that in each case two in a ring group (A ') or a column group (B') directly adjacent and with respect to their radii of curvature different facet negative surfaces (18) are designed such that the respective smaller radius of curvature smaller by at least 25% than the respective larger radius of curvature is.
    EP11170396A 2011-06-17 2011-06-17 Light reflector and method and device for its manufacture Withdrawn EP2535639A1 (en)

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    EP11170396A EP2535639A1 (en) 2011-06-17 2011-06-17 Light reflector and method and device for its manufacture

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    EP2535639A1 true EP2535639A1 (en) 2012-12-19

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    Cited By (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    ITFI20130177A1 (en) * 2013-07-26 2015-01-27 Iguzzini Illuminazione A lighting apparatus for the projection of images.
    WO2015079423A1 (en) 2013-11-29 2015-06-04 Saipem S.P.A. Apparatus, work station and method for applying protective sheeting of polymer material to a pipeline, and computer program for implementing the method
    WO2015087116A1 (en) * 2013-12-13 2015-06-18 Dmy Mühendislik Elektrik Makine İnşaat Ve Bilişim San. Tic. Ltd. Şti. A reflector for illumination
    TWI503506B (en) * 2013-07-19 2015-10-11 Chi Chang Hsieh Reflector of dental lamp
    EP3098504A1 (en) * 2015-05-06 2016-11-30 Bega Gantenbrink-Leuchten KG Twisted deep radiator reflectors

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    TWI503506B (en) * 2013-07-19 2015-10-11 Chi Chang Hsieh Reflector of dental lamp
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    WO2015087116A1 (en) * 2013-12-13 2015-06-18 Dmy Mühendislik Elektrik Makine İnşaat Ve Bilişim San. Tic. Ltd. Şti. A reflector for illumination
    EP3098504A1 (en) * 2015-05-06 2016-11-30 Bega Gantenbrink-Leuchten KG Twisted deep radiator reflectors
    US9841164B2 (en) 2015-05-06 2017-12-12 Bega Gantenbrink-Leuchten Kg Twisted downlight reflectors

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