EP2647905B1 - Plaque prismatique dotée d'angles de flanc variables - Google Patents

Plaque prismatique dotée d'angles de flanc variables Download PDF

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Publication number
EP2647905B1
EP2647905B1 EP13158393.2A EP13158393A EP2647905B1 EP 2647905 B1 EP2647905 B1 EP 2647905B1 EP 13158393 A EP13158393 A EP 13158393A EP 2647905 B1 EP2647905 B1 EP 2647905B1
Authority
EP
European Patent Office
Prior art keywords
structural elements
flank
angle
transparent cover
structural
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.)
Active
Application number
EP13158393.2A
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German (de)
English (en)
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EP2647905A2 (fr
EP2647905A3 (fr
Inventor
Christoph Lewers
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.)
Osram SBT GmbH
Original Assignee
Siteco Beleuchtungstechnik GmbH
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Publication date
Application filed by Siteco Beleuchtungstechnik GmbH filed Critical Siteco Beleuchtungstechnik GmbH
Publication of EP2647905A2 publication Critical patent/EP2647905A2/fr
Publication of EP2647905A3 publication Critical patent/EP2647905A3/fr
Application granted granted Critical
Publication of EP2647905B1 publication Critical patent/EP2647905B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F21Y2115/15—Organic light-emitting diodes [OLED]

Definitions

  • the present invention relates to a transparent cover for a lamp, in particular for a ceiling or wall lamp.
  • the cover has on at least one partial area a base surface with a surface structure, which is formed from structural elements.
  • a scattering plate having on one of its surfaces a plurality of recesses whose side walls are inclined.
  • the recesses may be conical or pyramidal.
  • the recesses are arranged in a uniform pattern on the plate.
  • a luminaire cover having on its outer side two intersecting sets of parallel main grooves of equal pitch and V-shaped cross-section bounding a plurality of equilateral quadrilaterals and in turn intersected by parallel, equidistant side grooves spaced closer than the main grooves, wherein the side surfaces of adjacent grooves form the sides of pyramidal elevations.
  • a transparent cover for a luminaire is known, on the surface of which prism bodies are formed.
  • the ridges and the side surfaces of all prismatic bodies are formed by cross-sectionally V-shaped longitudinal grooves and the frontally delimiting surfaces of the prism bodies by further parallel grooves which are also V-shaped in cross-section and intersect with the longitudinal grooves.
  • each polyhedron has a pyramid of the same page number.
  • the pyramidal surfaces have the same inclination.
  • a transparent plate is known, one surface of which is provided with a pattern of truncated pyramidal depressions.
  • a pair of crossed prisms the ridges of which are aligned in the direction of the base of the pyramidal depressions.
  • the prisms are arranged symmetrically at right angles.
  • WO 2011/107479 A1 discloses a luminaire with a flat light-directing element.
  • the light-directing element comprises conical elevations with different cone angles and with different angles of inclination of the longitudinal axes of the cones with respect to the plane in which the light-directing element is arranged.
  • US 2002/0071272 A1 discloses a lighting device with an optical element.
  • the optical element comprises a sequence of linearly extending prism elements whose prism angle may change stepwise between adjacent prism elements.
  • JP H06 308485 A discloses a display device with a prism plate having a plurality of pyramidal protrusions. The angles of inclination and the base areas of the pyramidal elevations may change between adjacent elevations.
  • the object of the present invention is to provide a transparent cover which enables improved glare reduction, in particular in luminaires in which light is not coupled in uniformly over the entire surface of the cover.
  • the present invention enables improved glare control and the adjustment of a desired light distribution curve, taking into account the positioning of lamps of the luminaire, in particular one or more surface light sources, fluorescent tubes, LED, OLED, etc.
  • the invention provides a transparent cover which defines a base surface with a surface structure on at least one subregion, wherein the surface structure is formed from structural elements.
  • at least one of the structural elements follows a baseline, wherein the at least one structural element has two flank legs enclosing a flank angle in a cross section running perpendicular to the base line, wherein the at least one structural element is elongated and has a flank angle varying along the baseline.
  • the invention thus provides a transparent cover which comprises structural elements which have a flank angle varying over the cover. In this way, the light emerging from the cover is refracted in different spatial directions.
  • flank angle of the structural elements in areas of the transparent cover, behind which there is a lamp of the lamp have a different value than in areas behind which there is no lamp. In this way, even with a non-homogeneous coupling of light, a uniform light-emitting light exit side of the transparent cover can be achieved and the light distribution can be adjusted in a targeted manner.
  • the structural elements can be formed as projections and / or as recesses.
  • the flank legs can run straight.
  • the cover may be formed as a plate, i. to follow a level.
  • the transparent cover can be made of plastic, in particular of polymethyl methacrylate (PMMA).
  • the plane can in particular run through the highest or lowest point of the respective structural element, if the structural elements are formed as projections or as recesses.
  • flank legs can be straight or curved.
  • flank angle may in particular be an angle enclosed by the secants of the flank legs
  • the flank angle of the at least one structural element can increase monotonically in particular from a first end to a second end of the at least one structural element.
  • the at least one structural element may include at least a portion in which the flank angle increases and at least a portion in which the flank angle decreases.
  • the at least one structural element may have along its base line an alternating sequence of sections in which the flank angle increases and sections in which the flank angle decreases.
  • the transparent cover may, in some embodiments, comprise a family of structural elements each following a baseline and having a flank angle varying along the baseline.
  • the baselines can be straight in particular. It is preferred that baselines are parallel to one another. Adjacent structural elements of the family can in particular each have the same distance from each other.
  • the flank angle may vary continuously or vary stepwise along the baseline. In particular, the edge angle along the base line can be constant in sections.
  • the transparent cover can have a further group of structural elements each following a baseline.
  • the structural elements of the further group may have in cross-section two flank angles enclosing a flank angle.
  • the baselines of the structural elements of the further group can run straight. It is preferred that the structural elements of the further group run parallel to one another.
  • the structural elements of the further group include a cutting angle with the at least one structural element or the plurality of structural elements. The cutting angle can be in particular 30 °, 45 °, 60 ° or 90 °. In this way, a uniform arrangement of the substructures formed between the structural elements results.
  • the structural elements of the further group can each have a varying flank angle along their base line.
  • the plurality of structural elements may each comprise a plurality of, in particular conical, frustoconical or prismatic substructure elements.
  • This offers the advantage that there are a plurality of side walls with different orientations within each structural element. In this way, the glare can be further improved.
  • the plurality of structural elements each have a single projection or recess, which extends in particular along the baseline of the structural element.
  • cone-shaped or frustoconical substructure elements are preferred, since these have a multiplicity of surface normals due to the curved lateral surface and thus permit light extraction in a multiplicity of spatial directions.
  • the flank angle corresponds to the cone angle of the respective substructure element.
  • the Cone angle is the opening angle of the lateral surface at the apex of the cone.
  • the flank angle corresponds to the cone angle of a cone whose lateral surface results as a continuation of the lateral surface of the truncated cone.
  • the substructure elements of a structural element are the same.
  • Each of the plurality of structure elements has a plurality of identical substructure elements. This causes a homogeneous lighting impression and facilitates the production of the cover.
  • substructure elements of a structural element are arranged along the baseline of the structural element. This also facilitates the production of the cover.
  • the flank angle increases over several, in particular over at least three adjacent, of the plurality of structural elements in one direction, in particular transversely to their base lines.
  • the flank angle of adjacent structural elements can in particular increase monotonically. In this way, a uniform lighting impression is created. In particular, a homogeneous glare of the lamp can be achieved in this way.
  • flank angle initially increases over a plurality of adjacent structural elements in one direction, in particular transversely to their base lines, and then decreases or initially decreases and subsequently increases.
  • the flank angle can alternately decrease and increase over a plurality of adjacent structural elements in one direction, in particular transversely to their base lines. This is particularly preferred when a lamp, for example a fluorescent tube or LED of the luminaire, is located behind the transparent cover in the boundary region between sections of increasing and decreasing flank angles.
  • a plurality of structural elements with the same flank angle are located between the structural elements of increasing flank angles and the structural elements of decreasing flank angles.
  • the structural elements each have a same flank angle. This causes a homogeneous light emission in the area of the lamps.
  • the flank angle may alternately increase and decrease across several adjacent features in one direction. It is preferred that the flank angle in each case over at least three, more preferably over at least five adjacent structural elements increases and / or decreases.
  • a number of transitions between sections of increasing and sections of decreasing flank angles of a number of lamps, e.g. LED groups correspond to the luminaire.
  • a transparent cover with a first group of structural elements can be provided, wherein the flank angle initially increases over several neighboring structural elements in one direction, is constant in the region of the first fluorescent tube, and then again decreases. Subsequently, the flank angle increases again to remain constant in the region of the second fluorescent tube, and then decrease again.
  • the at least one or more structural elements are designed exclusively as recesses or projections. This results in a homogeneous overall impression of the transparent cover. In particular, a more homogeneous glare is achieved.
  • the plurality of structural elements are translationally symmetric along their baselines. This allows easy production of the cover.
  • the one or more baselines are straight lines. This allows easy production of the transparent cover.
  • a straight course of the baseline is less noticeable to the viewer than, for example, a wave-shaped course of the baseline, which according to the invention is also possible.
  • their baselines may be straight.
  • the plurality of baselines are parallel to each other. This allows a uniform distribution of the flank surfaces of the structural elements, so that over the entire partial area of the surface, a desired glare effect can be adjusted. Furthermore, the cover is thereby easier to manufacture.
  • the structural elements are arranged uniformly, in particular in rows, preferably in periodic rows. This allows a homogeneous coupling of the emerging light.
  • the rows can be arranged in particular equidistantly.
  • the two flank legs of each structural element contact each other.
  • an intermediate region between the flank surfaces of the structural elements is avoided.
  • the surface structure does not have any surface subareas which run parallel to the base surface. In these embodiments, all of the surface portions are inclined with respect to the normal of the base of the transparent cover and thus contribute to the glare-free extraction of the exiting light.
  • the bisectors of the flank angles of at least two of the plurality of structural elements include different angles with the base.
  • the structural elements are generally inclined with respect to the base of the transparent cover. This allows better glare and targeted design of the light distribution curve of the lamp.
  • the bisectors of the flank angles of the structural elements are perpendicular to the base. This facilitates the manufacture of the cover.
  • the flank angle of the at least one structural element may vary in that a height and / or a width of the at least one structural element varies along its baseline.
  • the plurality of structural elements can thereby have a different flank angle, so that the structural elements have a different height and / or a different width.
  • the present invention provides a transparent cover which has a base surface with a surface structure on at least one subregion.
  • the surface structure is formed from structural elements, wherein the structural elements in a cross-section have two flank angles enclosing flank legs, wherein at least a first structural element follows a baseline and one follows along the baseline wherein at least three, in particular at least five structural elements of the first group have different flank angles, and / or wherein the structural elements at least a second group of conical or frusto-conical structural elements wherein at least two, in particular at least four, preferably at least six structural elements of the second group have different flank angles and / or have at least two different flank angles in alternating order over at least three adjacent structural elements.
  • the flank angle of the structural elements of the first and / or second group or more, in particular over at least three adjacent structural elements of the first and second group increases in one direction.
  • the direction may in particular extend transversely, preferably perpendicularly, to the baselines of the structural elements of the second group. This is particularly preferred if the baselines of the structural elements of the first group are straight and parallel to one another.
  • the flank angle initially increases over a plurality of adjacent structural elements of the first and / or second group in one direction and subsequently decreases.
  • the baseline of the first structural element and / or the baselines of the structural elements of the first group is a straight line.
  • the structural elements of the first group are parallel to each other.
  • the structural elements of the first and / or second group are arranged uniformly, in particular in rows.
  • adjacent structural elements of the first and / or second group each have an equal distance from each other.
  • the baselines of the structural elements of the first and / or second group are parallel and equidistant.
  • the structural elements of the second group may in particular be arranged in a pattern which has an integer, preferably a 3-, 4-, 6- or 8-fold rotational symmetry. This improves the homogeneity of the luminance of the light exit surface and enables the design of the light distribution curve.
  • the cover a plurality of first structural elements, which are arranged parallel to one another, in particular equidistantly.
  • the two flank legs of each structural element contact each other.
  • the angle bisectors of the flank angles of at least two, in particular of at least four, preferably of at least six structural elements of the first and / or second group include different angles with the base surface.
  • the present invention provides a luminaire, in particular a luminaire for lighting purposes, which may be formed as indoor or outdoor lamp, e.g. a trough luminaire, recessed or surface-mounted luminaire, pendant luminaire, floor lamp, ceiling or wall luminaire with a transparent cover of the type described ready.
  • the luminaire may moreover comprise one or more lamps, i. Bulbs, have.
  • a lamp may in particular comprise a fluorescent tube, an LED or OLED or a group of LEDs and / or OLEDs, which may be e.g. are arranged in one or more strips. It is preferred that the lamp has a plurality of lamps, which are arranged uniformly.
  • the luminaire may in particular have a plurality of fluorescent tubes arranged at the same distance in each case.
  • the light fixture may comprise a plurality of LEDs or OLEDs or groups of LEDs or OLEDs arranged in a uniform pattern.
  • the lighting means may e.g. be arranged centrally above the cover or over one or more edges of the cover.
  • the structural elements have a smaller flank angle in a lamp nearer region of the cover than in a region of the cover that is farther from the lamp. This allows a better glare of the lamp.
  • FIG. 1a shows a transparent cover 100 according to the present invention.
  • the transparent cover 100 has a plurality of substructures, which are generally designated by the reference numeral 101 here.
  • FIG. 1b shows a plan view of the section of the transparent cover 100.
  • the pyramidal substructures 101 arise between parallel, each following a straight line baseline structure elements 120-122 and another group of structural elements 110.
  • the other structural elements 110 divide the structural elements 120-122 respectively an angle of 90 °. In this case, the substructures 101 are formed between the structural elements.
  • each structural element 120-122 has two straight flank legs 150, 150 'in the cross-section perpendicular to its base line, ie perpendicular to its line of progression.
  • the two flank legs 150, 150 'of each structural element 120-122 touch each other at a contact point 160. They enclose an angle, wherein the flank legs of the structural elements 120 to 122 include different angles.
  • Figure 1d shows a cross section through the structural elements 110 of the further group along the line II-II of FIG. 1b ,
  • the structural elements 110 each have a same cross section.
  • the flank angle included between the two straight flank legs of the structural elements 110 is the same in each case.
  • FIG. 2a shows a section of another transparent cover 200 according to the present invention.
  • a plurality of substructures 201 are formed as prismatic recesses on the surface of the transparent cover 200.
  • FIG. 2b shows the part of the FIG. 2a in supervision.
  • the substructures 201 have ridge lines as the deepest structures. Further, the substructures 201 each have four side surfaces.
  • Substructures 201 are similar to those in FIG FIG. 1b represented by two groups of rectilinear structural elements.
  • the structural elements 210, 220-222 are each formed as straight-running projections with a V-shaped cross section.
  • the structural elements 220-222 are arranged in parallel and intersect the structural elements 210 of a further group at an angle of 90 °.
  • flank legs 250, 250 'of different structural elements 220-222 each include different flank angles at their contact point 260.
  • the flank angle of the structural elements 220-222 varies in the cross section of Figure 2c from bottom to top, first decreasing in a first section and then increasing again in a second section.
  • the structural elements 210 of the further group which run perpendicular to the structural elements 220-222 of the first group, each have a same cross-section (see Figure 2d ).
  • the substructures 201 formed between the structural elements 220-222 and the structural elements 210 are therefore different.
  • the ridge lines of the substructures 201 are in the middle of the in FIG. 2b shown section respectively in the region of the center of the base of the substructures.
  • the ridge lines of the substructures 201 in the corners of the detail are shifted from the center of the bases.
  • FIGS. 3a-c each show a cross section through a first group of structural elements.
  • the structural elements 301a-309a of the transparent cover 300a according to FIG. 3a are formed as projections and have a V-shaped cross-section.
  • each of the structural elements in cross-section has two flank legs 350a, 350a ', which in touch a touch point 360a.
  • the contact points 360a hereby represent the highest elevations of the surface structure of the transparent cover 300a.
  • Adjacent structural elements 301a-309a of the transparent cover 300a have different flank angles ⁇ , ⁇ .
  • the flank angle increases from the structural element 301a to the structural element 309a.
  • the variation of the flank angle takes place as in FIG. 3a shown continuously over several interposed structural elements.
  • the flank angle ⁇ , ⁇ is varied here by varying the height of the structural elements 301a-309a.
  • the height A of the structural element 301a is greater than the height B of the structural element 309a.
  • the height of a structural element denotes the distance between the highest and the lowest point of the structural element measured perpendicular to the base area of the transparent cover 300a.
  • FIG. 3b shows a further cross section through a transparent cover 300b.
  • the transparent cover 300b in this case has a series of parallel, rectilinearly extending structural elements 301b-309b, which are formed as cross-sectionally V-shaped projections.
  • the flank angle of the structural elements increases from the structural element 301b to the structural element 309b via a plurality of structural elements arranged therebetween.
  • the flank angle is hereby varied by varying a width A, B of the structural elements 301b-309b.
  • the width A, B of a structural element is understood to be the distance between two lowest points, measured parallel to the base area of the transparent cover 300b, if the structural element is formed as a projection, or between two highest points, if the structural element is formed as a recess.
  • Figure 3c shows a cross section through a transparent cover 300c.
  • the transparent cover 300c has a plurality of juxtaposed structural elements 301c-309c.
  • the structural elements 301c-309c each have a V-shaped cross section and are formed as projections.
  • Each of the structural elements 301c-309c has in cross-section two flank legs 350c, 350c ', which touch each other at a contact point 360c.
  • the contact points 360c each represent the highest elevations of the structural elements.
  • the flank angle which is enclosed by the flank legs 350c, 350c 'of a structural element, varies from one structural element to the next. In particular, the flank angle decreases from a value ⁇ to a value ⁇ starting from the structural element 301c to the structural element 309c.
  • the flank angle is here thereby varies that the Position of the contact point 360c within the cross section of each structural element varies. While the point of contact of the structural member 201c is centered in the cross section, the point of contact of the structural member 301c is displaced from the center of the cross section of the structural member. While the bisector of the flank angle of the structural member 301c is perpendicular to the bottom surface of the transparent plate 300c, it is inclined to the vertical with the structural member 309c.
  • the contact points 360c of the structural elements 301c-309c in this case have the same height above the base area of the transparent cover 300c.
  • FIG. 4a shows a transparent cover 400 with prismatic recesses, which are generally designated by the reference numeral 401.
  • the transparent cover 400 is formed as a transparent plate.
  • the prismatic recesses 401 are formed by three groups of rectilinear structural elements 411-413, 420, 430. The structural elements of each of these groups in each case run parallel to one another and enclose an angle of 60 ° with the structural elements of the other groups.
  • FIG. 4b shows a plan view of the transparent cover 400.
  • the prismatic recesses 401 each have three side surfaces. As in the cross section of Figure 4c is recognizable, adjacent structural elements 411-413 of the first group have different flank angles.
  • FIGS. 5a-d each show plan views of different surface sections of a transparent cover according to the present invention.
  • the transparent cover of the FIG. 5a In this case, four groups of structural elements 510a, 520a, 530a, 540a are provided, the structural elements of each group extending parallel to one another.
  • the structural elements of different groups include an angle of 45 ° or 90 °. In this way, prismatic projections or recesses are formed between the structural elements, which have three sides.
  • FIG. 5b shows a surface structure with three groups of structural elements 510b, 520b, 530b, which each enclose an angle of 60 °.
  • the FIGS. 5c and 5d show further embodiments of the surface structure of a transparent cover in the plan.
  • the structural elements may have different angles to one another in alternative embodiments.
  • Each of the groups of structural elements shown can have different flank angles.
  • FIG. 6 shows two, each of a baseline following structural elements 610, 690.
  • the elongated structural element 610, 690 enclose an angle of 90 ° and are formed as in cross-section V-shaped projections.
  • the structural element 610 has two flank sides, which include a flank angle ⁇ .
  • the flank angle ⁇ is constant over the course of the structural element 610, ie, the structural element 610 is translationally symmetrical along its base line.
  • the structural element 690 also has two flank sides, which include a flank angle ⁇ , ⁇ '. However, the flank angle ⁇ , ⁇ 'varies along the course of the base line 691 of the structural element 690.
  • flank angle ⁇ , ⁇ ' takes place here in that a width a, b of the structural element 690 increases along the course of the base line 691.
  • a family of further first structural elements which run parallel to the structural element 690, as well as further structural elements of a group which run parallel to the structural element 610.
  • FIG. 7 shows a similar arrangement of structural elements such as FIG. 6 ,
  • a first structural element 790 is provided which follows a straight base line 791 and has a flank angle ⁇ , ⁇ 'varying along the base line 791.
  • the first structural element 790 is cut by two further structural elements 710, 720 each at an angle of 90 °.
  • the structural elements 710, 720 also follow in each case a straight base line and run parallel to one another.
  • the structural elements 710, 720 each have two flank sides.
  • the two flank sides of the structural element 710 include a flank angle ⁇ , which is constant along the profile of the structural element 710.
  • the edge sides of the structure element 720 include a flank angle ⁇ , which is also constant along the course of the baseline of the structure element 720.
  • the flank angle ⁇ of the structural element 720 is greater than the flank angle ⁇ of the structural element 710.
  • FIG. 8a shows a transparent cover 800.
  • the transparent cover 800 has on a surface a plurality of conical projections 811-813.
  • the conical projections are arranged uniformly.
  • the protrusions 811-813 are arranged in columns and rows.
  • Adjacent projections have the same distance from each other.
  • adjacent conical projections each have the same cone angle (s. Fig. 8c ) and may be considered as substructure elements forming a structural element.
  • the structural element extends along a baseline parallel to the y-direction. Several such structural elements are arranged periodically next to one another in the x-direction.
  • FIG. 9a shows a section of another transparent cover 900.
  • This has a plurality of conical projections 911-913 on a portion of a surface.
  • the projections 911-913 are arranged in columns and in rows. In the y-direction adjacent projections thereby form a structural element, whose cone angles are equal in each case (s. Fig. 9c ). Adjacent structural elements are arranged offset in the x-direction, so that a hexagonal honeycomb structure is formed.
  • Adjacent projections 911-913 in the x-direction have different cone angles, ie different flank angles. As in the cross section of FIG. 9b As can be seen, the cone angle first decreases from the projection 911 to the projection 912, while the angle subsequently increases again over a plurality of projections towards the projection 913.
  • FIG. 10 shows a surface structure of a transparent cover with three structural elements 590-592.
  • the structural elements 590-592 in each case follow a straight base line and are designed as projections which are V-shaped in cross-section.
  • the structural elements 590-592 each have two flank sides which touch each other at a ridge line.
  • the flank sides the structural elements 591 and 592 include the same flank angle ⁇ , while the structural element 590 has a different flank angle ⁇ .
  • the structural elements 590 and 591 intersect at an angle ⁇ .
  • the structural elements 590 and 592 intersect at an angle ⁇ .
  • FIG. 11 shows a perspective view of a section of a transparent cover 400 '.
  • the surface structure of the transparent cover 400 ' is formed by three sets of structural elements.
  • the structural elements are each formed as a V-shaped, a straight base line following projections.
  • the projections each have flank sides which touch each other at a ridge line.
  • a first group of structural elements 411'-414 ' run parallel to one another, wherein adjacent structural elements of the first family have a different flank angle.
  • Structural element 411 'in the rear of the in FIG. 10 illustrated transparent cover 400 ' has a flank angle ⁇
  • structural element 413' which also belongs to the first coulter, is arranged in the central region and has a flank angle ⁇ .
  • Another structural element 414 'of the first share which in the front of the FIG. 10 is shown, has a flank angle ⁇ . Seen from the rear to the front, the flank angle of adjacent structural elements 411'-414 'increases from an angle ⁇ initially to an angle ⁇ strictly monotonically over several structural elements and subsequently decreases in a strictly monotonic manner to a flank angle ⁇ over several structural elements.
  • the structural elements 411'-414 'of the first family are cut by two further families of structural elements. In this case, a second family of structural elements 421 ', 422', 423 'is provided. The structural elements 421 ', 422' and 423 'are straight and parallel to each other.
  • flank angle of these structural elements varies along their course.
  • the structural element 423' of the second share a flank angle ⁇ , which decreases to the central region to an angle ⁇ to a lower region, the flank angle of the structural element 423 'then increases to a value ⁇ .
  • FIG. 12a-f show cross sections through various types of structural elements in the form of protrusions, which can be used in a cover according to the invention as a first structural element or as structural elements of a first family.
  • FIG. 12a shows a structural element with two straight flank legs 950a, 950a 'in cross section. The two flank legs 950a, 950a 'touch in one point and close there a flank angle ⁇ .
  • FIG. 12b also shows a cross section through a structural element with two flank legs 950b. 950b '. However, these do not touch, but include a flat intermediate region 960 between them, which runs parallel to a base of the transparent cover.
  • the flank angle ⁇ corresponds to the angle which is enclosed by the flank legs 950b, 950b ', wherein for the construction of the flank angle ⁇ , the flank legs are to be extended mentally upwards (see dashed lines in FIG. 12b ).
  • FIG. 12c shows a cross section through another structural element with two flank legs 950c, 950c '.
  • the flank legs 950c, 950c ' are convexly curved and contact each other at a contact point 960c.
  • the flank angle ⁇ in this embodiment corresponds to the angle which is enclosed by the secants of the flank legs 950c, 950c '.
  • FIG. 12d shows a cross section through another structural element of a first group with two flank legs 950d, 950d ', which are straight and touching.
  • the flank legs 950d, 950d ' include a flank angle ⁇ .
  • an angle bisector 970d of the flank angle ⁇ is drawn.
  • the bisecting line 970d encloses an inclination angle ⁇ with a base of the transparent cover.
  • different structural elements of the first family may have different angles of inclination ⁇ , ie the inclination of the bisectors may be different.
  • the slope of the bisector may vary along the baseline of a feature.
  • FIG. 12e shows a cross section through another structural element with two flank legs 950e, 950e '.
  • the flank legs 950e, 950e ' are straight and include two more flank legs.
  • FIG. 12f shows another structural element with two flank legs 950f, 950f.
  • the flank legs 950f, 950f ' are each concavely curved and touch each other at one point.
  • the flank angle ⁇ enclosed by the flank legs 950f, 950f corresponds to the intersection angle of the secants of the flank legs 950f, 950f ', as in FIG FIG. 12f shown. 12f shown.
  • one of the flank legs may be straight while the other flank leg is curved, in particular concavely or convexly curved.
  • the flank legs can touch each other.
  • the flank legs may include an intermediate area between them. The intermediate area may be flat, angled or arbitrarily curved.
  • the structural elements can be configured as projections or as recesses.
  • structural elements each having a same flank angle can be located between sections of increasing flank angles and sections of decreasing flank angles. Via adjacent structural elements, the flank angle can first decrease and then increase or initially increase and then decrease. Alternatively, the flank angle can alternately increase and decrease.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (6)

  1. Recouvrement transparent qui définit sur au moins une zone partielle une surface de base avec une structure superficielle, la structure superficielle étant formée d'éléments structurels, au moins un des éléments structurels (690 ; 790) suivant une ligne de base (691 ; 791), et l'élément structurel au moins au nombre de un présentant, dans une section transversale placée perpendiculairement à la ligne de base, deux branches de flanc formant un angle de flanc (α, α'), caractérisé en ce que l'élément structurel (690 ; 790) au moins au nombre de un est allongé et présente un angle de flanc (α, α') variant le long de la ligne de base.
  2. Recouvrement selon la revendication 1, l'élément structurel (690) au moins au nombre de un étant constitué exclusivement en tant que décrochement ou saillie.
  3. Recouvrement selon l'une des revendications précédentes, la ligne de base (691 ; 791) étant une droite.
  4. Recouvrement selon l'une des revendications précédentes, les éléments structurels étant disposés de façon uniforme, en particulier en rangées, de préférence en rangées périodiques.
  5. Recouvrement selon l'une des revendications précédentes, les deux branches de flanc de chaque élément structurel se touchant mutuellement.
  6. Luminaire avec un recouvrement transparent selon l'une des revendications précédentes.
EP13158393.2A 2012-04-05 2013-03-08 Plaque prismatique dotée d'angles de flanc variables Active EP2647905B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012102987A DE102012102987A1 (de) 2012-04-05 2012-04-05 Prismenplatte mit variierenden Flankenwinkeln

Publications (3)

Publication Number Publication Date
EP2647905A2 EP2647905A2 (fr) 2013-10-09
EP2647905A3 EP2647905A3 (fr) 2014-03-19
EP2647905B1 true EP2647905B1 (fr) 2016-04-27

Family

ID=47845791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13158393.2A Active EP2647905B1 (fr) 2012-04-05 2013-03-08 Plaque prismatique dotée d'angles de flanc variables

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EP (1) EP2647905B1 (fr)
DE (1) DE102012102987A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016215605A1 (de) 2016-08-19 2018-02-22 Osram Gmbh Entblendungsplatte und Verfahren zum Herstellen einer Entblendungsplatte

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB878215A (en) 1956-12-10 1961-09-27 Holophane Ltd Light refracting and transmitting plates and equipment using the same
US3163367A (en) 1959-08-10 1964-12-29 Bodian Marcus Light diffuser
DE1201781B (de) 1963-08-17 1965-09-30 Eisenhuette Prinz Rudolph Ag Anlage zur mechanischen Aufbereitung von Haus- und Gewerbemuell
DE1920071C3 (de) 1969-04-21 1979-07-19 Trilux-Lenze Kg, 5760 Neheim-Huesten Leuchte mit langgestreckten Lampen und einer transparenten Abdeckung
DE2520429C3 (de) 1975-05-07 1978-05-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Lichtdurchlässige Abdeckung für Leuchten
ES2070349T3 (es) * 1991-01-31 1995-06-01 Siemens Ag Lampara.
JPH06308485A (ja) * 1993-04-21 1994-11-04 Hitachi Ltd 表示装置
JP3441991B2 (ja) * 1998-12-09 2003-09-02 キヤノン株式会社 照明装置及びそれを用いた撮影装置
AT509563B1 (de) * 2010-03-01 2015-10-15 Hierzer Andreas Leuchte mit lichtausrichtungselementen
DE102010014289B4 (de) * 2010-04-08 2014-03-27 Trilux Gmbh & Co. Kg Leuchtmodul und Leuchte mit Leuchtmodul

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DE102012102987A1 (de) 2013-10-10
EP2647905A2 (fr) 2013-10-09
EP2647905A3 (fr) 2014-03-19

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