EP2487409A1 - Réflecteur pour moyens d'éclairage - Google Patents

Réflecteur pour moyens d'éclairage Download PDF

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Publication number
EP2487409A1
EP2487409A1 EP12154231A EP12154231A EP2487409A1 EP 2487409 A1 EP2487409 A1 EP 2487409A1 EP 12154231 A EP12154231 A EP 12154231A EP 12154231 A EP12154231 A EP 12154231A EP 2487409 A1 EP2487409 A1 EP 2487409A1
Authority
EP
European Patent Office
Prior art keywords
light
base body
reflector
reflecting surfaces
total reflecting
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Withdrawn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
EP12154231A
Other languages
German (de)
English (en)
Inventor
Henning Dieker
Hartmut Friedrich
Marcel Nierhoff
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.)
Vossloh Schwabe Lighting Solutions GmbH and Co KG
Original Assignee
Vossloh Schwabe Lighting Solutions 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 Vossloh Schwabe Lighting Solutions GmbH and Co KG filed Critical Vossloh Schwabe Lighting Solutions GmbH and Co KG
Publication of EP2487409A1 publication Critical patent/EP2487409A1/fr
Withdrawn legal-status Critical Current

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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
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/10—Construction

Definitions

  • the invention relates to a reflector which can be used in particular in connection with LED illuminations or similar semiconductor light sources.
  • LEDs have a very small light-emitting volume, on the one hand the bundling of LED light, e.g. on the other hand, but also requires special attention, so that no eye damage occurs.
  • LEDs when used for illumination purposes, they are regularly used in groups or arrays to increase the luminous efficacy. This must be taken into account when designing appropriate optical elements to distribute the LED light in space or objects in a particular desired manner.
  • the DE 10 2005 045 588 A1 a lighting device with LEDs, which are associated with specially designed light-guiding elements. On their side facing the LEDs they have a series of parallel ribs. At the light exit side, however, they have away from each other aspiring wings that emit the light should.
  • the DE 20 2005 006 915 U1 discloses a plate-shaped light guide member having a flat side on which an LED is disposed to introduce light into the plate-shaped member. Through total reflection, the light is held within the plate and scattered on outer contours, which then shine.
  • the DE 20 2010 006 557 U1 discloses a suitable also for the use of LEDs lamp with a light exit lens, which is designed as a zonal lens. This leads to an LED-facing back with annular zone lens structures that must be matched to the respective application arrow.
  • a plurality of totally reflecting surfaces are formed in the base body.
  • the main body is seamlessly one-piece, i. integrally. It preferably consists entirely of a uniform material.
  • To the body further parts, e.g. be applied by gluing, welding, clamping or other types of fastening, such as enclosures, covers, protective plates, possibly also scattering elements, light conversion elements and the like.
  • the totally reflecting surfaces are embedded in the volume of the base body. Preferably, they do not appear at any point of the body. They may have been produced by laser engraving, for example. For example, by laser engraving as total reflecting surfaces, gaps, cracks, slit-like microcavities and the like can be produced. These surfaces each have limited dimensions. In particular, such surfaces are the walls laser-generated columns, where the continuity of the body is interrupted.
  • the totally reflecting columns are two-dimensional planar elements.
  • the laser beam used to create the surfaces can cause physical and / or chemical changes in the volume of the reflector, ultimately leading to a structural change and the formation of the desired surface.
  • This structural change may be due to local overheating.
  • the embedding of the total reflecting surface (s) in the body ensures their lasting effectiveness. Pollution is excluded.
  • it is easy to produce reflectors in this way the duration of use of which is readily adapted to the long service life of LED light sources. This is in contrast to other reflectors or lenses, e.g. Zone lenses which, when soiled, are hardly cleanable and therefore unusable.
  • the reflector according to the invention preferably has a base body with a smooth light entrance surface and / or a smooth light exit surface.
  • the light entry surface and the light exit surface are planar.
  • the transparent base body may be formed as a flat plate in which one or more total reflecting surfaces are arranged in a desired pattern to effect a desired light distribution, light bundling, light expansion or light scattering for one or more LED light sources.
  • the main body can also, for example due to the production, a wavy light entrance surface and / or light exit surface exhibit.
  • the arrangement and / or distribution, inclination, size, shape, etc. of the totally reflecting surfaces can be determined, for example by computer control of the gravitational laser beam, so that the waviness of the light entry surface and / or light exit surface is compensated, ie the desired one Light distribution is not adversely affected.
  • the total reflecting surface is preferably a flat surface. However, it can also have a certain curvature or curvature.
  • the desired reflector is formed by a plurality of facet-like total reflecting surfaces arranged in a pattern giving the desired light distribution in the base body. Due to the distribution, shape, curvature, arrangement and inclination of the individual facets, i. total reflective surfaces, can be almost any desired light distribution from the bundling to a parallel beam to a planar light distribution with uniform or set up according to a pattern predetermined illumination.
  • the individual total reflecting surfaces are arranged along concentric circles or spirals whose center forms the optical axis.
  • the LED is then preferably arranged on this optical axis.
  • a base body a plurality of optical axes on which a plurality of LEDs are arranged.
  • the totally reflecting surfaces are then grouped around the respective optical axes in a suitable pattern whose arrangement, size and inclination determines the desired light distribution.
  • the reflector according to the invention can be operated in transmitted light. It has on one side a light entrance surface and e.g. on the opposite side or on an adjacent surface on a light exit surface.
  • the individual total reflecting surfaces are distributed in the base body according to a first family of embodiments in such a way that light which radiates through the base body in the direction of the optical axis strikes the individual totally reflecting surfaces at an acute angle and thereby undergoes a deflection.
  • the reflector thus acts like a lens, e.g. like a condensing lens, such as a diverging lens or any other lens.
  • the reflector may be formed such that the light entry surface and the light exit surface lie on the same side of the main body, so that the reflector as a mirror, e.g. like a concave mirror, works. This is determined only by the number and arrangement, as well as shape, size and orientation of the individual total reflecting surfaces.
  • the reflector may be operated with side light irradiation. Its optical axis contains an angle.
  • the reflector may be formed as a more or less flat plate which receives light from one or more LEDs or other light sources at one or more side surfaces and by a large area rectangular, square, round, polygonal, strip or otherwise emits a shaped light exit surface.
  • the lens formed by the reflector according to the invention does not produce any color aberrations and thus allows the illumination of objects or rooms with white light without rainbow effect.
  • the inventive concept allows the design of various refraction geometries by laser engraving a solid transparent body, such as glass body and is therefore particularly flexible application.
  • Fig. 1 illustrates a reflector 10 according to the invention, which serves to bundle the light of a light-emitting diode 11 in the desired manner or to distribute.
  • the reflector 10 works externally like a lens. It has a light entry surface 12 and a light exit surface 13, which are arranged on sides facing away from one another of the reflector 10, which is preferably designed as a flat planar plate. If necessary, however, the light entry surface and / or the light exit surface 13 may also be structured, for example arched or provided with other structures. However, the flat design is particularly easy to clean and facilitates the production considerably.
  • the reflector 10 comprises a base body 14 made of as clear as possible transparent material, e.g. Mineral glass, quartz glass, ceramic glass, acrylic glass or other transparent plastic.
  • a base body 14 made of as clear as possible transparent material, e.g. Mineral glass, quartz glass, ceramic glass, acrylic glass or other transparent plastic.
  • totally reflecting surfaces 15 are preferably formed in large numbers. As shown, these are preferably located within a zone 16 which is arranged at a constant distance from the light entry surface 12. Likewise, the zone 16 is preferably constantly spaced from the light exit surface 13.
  • the total reflecting surfaces 15 preferably have a constant extension in the direction of the optical axis 17, so that the zone 16 has a constant thickness. It should be noted, however, that it may also be desirable and expedient to form the zone 16 spatially deviating, so that it is curved, for example, and increases or decreases in thickness towards its edges, ie with increasing distance from the optical axis.
  • the total reflecting surfaces 15 are, as in particular Fig. 2 , preferably grouped around the optical axis 17 on a spiral or concentric circles around each light beam emanating from the light emitting diode 11, passing through the light entry surface by total reflection to give a desired angular deflection.
  • the total reflecting surfaces 15 are, as can be seen, densely staggered in the radial direction.
  • the distance between adjacent total reflecting surfaces 15 is preferably so small that between them both no light beam emanating from the LED 11 can pass unreflected. In Fig. 1 this is illustrated by the example of the total reflecting surfaces 15a, 15b.
  • the total reflecting surfaces 15 may be formed by laser engraving in the solid undivided main body 14, for example.
  • Fig. 1a illustrates the total reflecting surface 15a as an example.
  • a gap-like cavity is created in the base body 14, which is bounded by two boundary surfaces 18, 19.
  • the interior of the cavity is empty (vacuum) or filled by a, for example gaseous, glass decomposition product. It is also possible that it is filled by a resulting liquid or even a solid material, which has been created by the action of the used for producing focused laser beam, where it is itself transparent, but it has a different, preferably lower refractive index than that Material of the surrounding body 14. In this way, at a large angle to the interface 19 incident light experiences a total reflection.
  • the total reflecting surfaces 15 are arranged in the base body 19 so that all the light rays emanating from the light emitting diode 11 impinge at an angle to the respective total reflecting surface 15, the larger is as the necessary to bring about the total reflection limit angle ⁇ .
  • Fig. 1 the surface normal 20 of the total reflecting surface 19 registered.
  • the angle ⁇ is the angle at which an incident light beam just barely undergoes total reflection. Smaller angles no longer lead to total reflection.
  • the angle which the incident light beam 21 includes with the surface normal 20 is greater than the angle ⁇ . This condition is respected for all rays of light, like Fig. 1 shows.
  • the zone 16 may have gaps.
  • a central zone is left around the optical axis 17 in which the light of the light-emitting diode 11 can pass through the base body 14 without total reflection.
  • the reflector 10 described so far operates externally as a lens, as is readily apparent. He can be very thin. Its necessary thickness is insignificantly greater than that of zone 16. It is therefore possible to replace bulky collecting lenses with relatively flat plates of the type according to the invention.
  • almost any desired light distribution can be achieved by an appropriate orientation of the individual total reflecting surfaces 15, without having to deviate from the planar design of the reflector 10.
  • the individual total reflecting surfaces 15 are, for example, by generates a laser processing step with a computer-controlled laser, wherein for the modification of the light distribution to be generated and thus arrangement of the surface 15 only the data controlling the computer record must be changed. It is thus a flexible lighting design possible.
  • FIG. 3 out A modified embodiment of the reflector according to the invention is made FIG. 3 out.
  • the illustrated there reflector 10 has a plurality of optical axes 17a, 17b, which light emitting diodes 11a, 11b are assigned.
  • the reflector 10 in turn contains a number of totally reflecting surfaces 15 in its base body 14, these total reflecting surfaces 15 being associated in a first group of the light emitting diode 11a and a second group of the light emitting diode 11b.
  • the surfaces 15 of the light emitting diode 11a are grouped around the optical axis 17a, while the surfaces 15 of the light emitting diode 11b are grouped around the optical axis 17b.
  • FIG. 4 schematically illustrates another embodiment of the invention.
  • the base body 14 is here provided with a further optical element 23.
  • This may for example be mounted on the light exit surface 13.
  • the optical element 23 may be a plate or layer in which scattering elements are embedded, for example to produce diffused light. It may also be a layer or plate, in the alternative or in addition Light conversion particles are embedded. Also partially light-absorbing or light-reflecting elements such as opaque metal foils may be arranged on or in the optical element 23, for example, to achieve decorative effects or signal effects, for example, for signs.
  • light-scattering objects can also be introduced into the base body 14, for example in the form of light-scattering points generated by laser engraving. In this way, a uniform diffuse light distribution can be generated.
  • the reflector 10 as a mirror, as in FIG. 5 is symbolically illustrated.
  • the light entry surface 12 and the light exit surface 13 are arranged on the same side of the base body 14.
  • totally reflective surfaces 15 are arranged in the base body 14.
  • a second group of totally reflecting surfaces 24 may be provided or other groups if the light beams are to be totally reflected on their way from the light emitting diode 11 to the light exit surface 13 not only one, but two or more times.
  • Such a reflector can be used for indirect room lighting when it is mounted, for example, floating in front of a wall with light exit surface 13 toward the wall. The viewer facing side 25 can then remain dark. However, it is also possible to let outgoing light from the light emitting diode 11 partly from the side 25, for example when the totally reflecting surfaces 15 leave gaps 26 through which light can pass.
  • This light in turn, can be directed into the room as desired by further totally reflecting surfaces, for example downward to avoid glare effects.
  • the main body 14 may be plate-like with rectangular or square border round, oval or in any other form. The concept presented here is variably customizable in almost every respect.
  • FIG. 6 illustrated embodiment illustrates. It is based on the embodiment according to FIG. 1 , whose description is referenced here.
  • the reflector 10 after FIG. 6 has in the near-axis region about the optical axis 17 around totally reflecting surfaces 15c, which prevent the direct passage of light and the resulting glare.
  • the surfaces 15c reflect the light approximately radially outward.
  • the concept according to the invention is not restricted to the fact that the light entry surface 12 and the light exit surface 13 are arranged on sides of the main body 14 pointing away from one another.
  • the light entry surface 12 may also be formed by one or more side surfaces of the base body 14.
  • Light sources such as LEDs 11 may be arranged, which radiate light into the body.
  • reflecting surfaces 15 are arranged by total reflection, which can escape the light from the preferably flat light exit surface 13.
  • the total reflecting surfaces 15 are as possible distributed, shaped, arranged that emerges from the light exit surface 13, the light with the desired orientation and distribution. For this purpose, all the above-described measures can be used, which have been described above in connection with the other embodiments.
  • completely reflecting facets or surfaces 15 are generated by laser engraving or other suitable processing techniques in a transparent base body, which are preferably completely embedded in the base body 14 and the surface does not reach or touch. They are therefore deprived of external environmental influences.
  • the shape, number, distribution and orientation of the total reflecting surfaces make it possible to produce reflectors with lens properties, with mirror properties or with mixed properties. Mixed light experiences by the total reflection no spectral splitting. As a result, it is possible to achieve very large angular deflections for the individual light beams, without resulting in undesired rainbow effects.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lenses (AREA)
EP12154231A 2011-02-11 2012-02-07 Réflecteur pour moyens d'éclairage Withdrawn EP2487409A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110000652 DE102011000652A1 (de) 2011-02-11 2011-02-11 Reflektor für Beleuchtungszwecke

Publications (1)

Publication Number Publication Date
EP2487409A1 true EP2487409A1 (fr) 2012-08-15

Family

ID=45562870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12154231A Withdrawn EP2487409A1 (fr) 2011-02-11 2012-02-07 Réflecteur pour moyens d'éclairage

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EP (1) EP2487409A1 (fr)
DE (1) DE102011000652A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2760053A2 (fr) 2013-01-29 2014-07-30 Schott AG Concentrateur ou répartiteur de lumière

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576436A (en) * 1983-01-31 1986-03-18 Maurice Daniel Light distribution and collection assemblies and methods
DE202005006915U1 (de) 2005-04-29 2005-07-07 Röhrig, Martin Lichtlenkungselement für LED-Leuchte
DE102005045588A1 (de) 2004-09-24 2006-05-04 Epistar Corp. Beleuchtungsvorrichtung
DE602005004314T2 (de) 2004-02-16 2008-05-21 Citizen Electronics Co., Ltd., Fujiyoshida Flache Lichtquelle
DE202009015892U1 (de) 2009-11-20 2010-06-10 Meyer, Gerald Homogen ausgeleuchteter Leuchtkörper
DE202010006557U1 (de) 2010-04-13 2010-09-30 Frensch Gmbh Einbauleuchte
EP2264493A1 (fr) * 2009-06-16 2010-12-22 Gerhard Dipl.-Phys. Karl Guide de lumière doté de réflecteurs pour l'éclairage de surface régulier
WO2011001428A1 (fr) * 2009-06-30 2011-01-06 Magic Lighting Optics Ltd Dispositif et procédé de focalisation par guide de lumière

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576436A (en) * 1983-01-31 1986-03-18 Maurice Daniel Light distribution and collection assemblies and methods
DE602005004314T2 (de) 2004-02-16 2008-05-21 Citizen Electronics Co., Ltd., Fujiyoshida Flache Lichtquelle
DE102005045588A1 (de) 2004-09-24 2006-05-04 Epistar Corp. Beleuchtungsvorrichtung
DE202005006915U1 (de) 2005-04-29 2005-07-07 Röhrig, Martin Lichtlenkungselement für LED-Leuchte
EP2264493A1 (fr) * 2009-06-16 2010-12-22 Gerhard Dipl.-Phys. Karl Guide de lumière doté de réflecteurs pour l'éclairage de surface régulier
WO2011001428A1 (fr) * 2009-06-30 2011-01-06 Magic Lighting Optics Ltd Dispositif et procédé de focalisation par guide de lumière
DE202009015892U1 (de) 2009-11-20 2010-06-10 Meyer, Gerald Homogen ausgeleuchteter Leuchtkörper
DE202010006557U1 (de) 2010-04-13 2010-09-30 Frensch Gmbh Einbauleuchte

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2760053A2 (fr) 2013-01-29 2014-07-30 Schott AG Concentrateur ou répartiteur de lumière
DE102013100888A1 (de) * 2013-01-29 2014-07-31 Schott Ag Licht-Konzentrator oder -Verteiler

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DE102011000652A1 (de) 2012-08-16

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