EP2430360A1 - Lighting device for streets - Google Patents
Lighting device for streetsInfo
- Publication number
- EP2430360A1 EP2430360A1 EP10730388A EP10730388A EP2430360A1 EP 2430360 A1 EP2430360 A1 EP 2430360A1 EP 10730388 A EP10730388 A EP 10730388A EP 10730388 A EP10730388 A EP 10730388A EP 2430360 A1 EP2430360 A1 EP 2430360A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- lens
- longitudinal
- lighting device
- coupled
- 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- Withdrawn
Links
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
- F21V5/04—Refractors for light sources of lens shape
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
-
- 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
- F21V5/08—Refractors for light sources producing an asymmetric light distribution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/10—Outdoor lighting
- F21W2131/103—Outdoor lighting of streets or roads
-
- 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]
Definitions
- the invention relates to a lighting device for roads, paths and the like, comprising a light unit comprising a light emitting element and arranged in the main emission before the light emitting lens for generating a predetermined light distribution characteristic, wherein the lens on a light emitting element facing the Lichteinkoppelseite a Lichteinkoppel composition and on a side facing away from the light emitting element Lichtauskoppelseite has a light output surface at which the light is refracted.
- a lighting device for vehicles which, in addition to a luminous element and a reflector, has a lens arranged in front of the luminous element in the light emission direction.
- the lens is designed to be rotationally symmetrical with respect to the optical axis of the luminous element and has a total reflection surface on a side facing away from the luminous element, so that the light impinging on it is reflected transversely to the main emission direction toward an edge-side light outcoupling surface. There is thus a deflection in the lateral direction towards the reflector surfaces.
- the lens thus essentially serves as a light deflection means in the direction of the lateral reflector surface and not exclusively for producing a predetermined light distribution.
- a lighting device with a light unit for streets, paths and the like which has a luminous element and a lens arranged in front of the same in the main light emission direction for generating a predetermined light distribution.
- the lens is dome-shaped and point-symmetrical with respect to points of an optical axis of the luminous element, with a plurality of segmented free-form surfaces being formed on a light outcoupling side of the lens facing away from the luminous element.
- a light input surface arranged on a light input side facing the luminous element has a spherical shape. Depending on the curvature of the light output surface of the lens larger or smaller rectangular light distributions are generated.
- the lighting units are only suitable to illuminate a portion of a street space to be illuminated. In order to illuminate the entire street space to be illuminated, it is necessary to combine lighting units with differently contoured or shaped lenses.
- Object of the present invention is therefore to develop a lighting device such that in a simple way demand-oriented a predetermined light distribution for homogeneous illumination of a room is achieved.
- the invention in conjunction with the preamble of claim 1, characterized in that the light input surface and / or the light outcoupling surface of the lens is formed in a direction transverse to the optical axis of the light-emitting element such that the light intensity of the outcoupled light, starting from a center plane intersecting the optical axis increases with an increasing radiation angle to the optical axis at least partially corresponding to a tangent function.
- the particular advantage of the invention is that a light bundle can be emitted by the lens tuned to the emission characteristic of the luminous element, in which the light intensity thereof increases with an increasing emission angle relative to the optical axis in accordance with a tangent function.
- a homogeneous illumination of a preferably rectangular area, in particular street can advantageously take place.
- a light incoupling surface and / or a light outcoupling surface of the lens is designed such that the tangential increase in light intensity increases in the longitudinal direction up to a first characteristic and in the transverse direction up to a second characteristic, wherein the first characteristic is larger as the second characteristic.
- the first characteristic can be in an angle range between 55 ° and 75 °. In the case of an LED light element with Lambertian radiation characteristic, the characteristic angle is approximately 55 °.
- the first identifier Angle and the second characteristic are respectively related to the optical axis radiation angle at which the light intensity in the longitudinal direction or in the transverse direction reaches its maximum.
- the light intensity decreases again, wherein the fall of the maximum of the light intensity can then be preferably cosinusoidal.
- a homogeneous rectangular illumination of a surface can take place, at the same time an undesired glare from remote persons can be prevented. It is assumed here that the optical axis of the lighting unit is oriented perpendicular to the road surface to be illuminated, so that remote road users who see the lighting device at a relatively shallow angle are not dazzled.
- the lens is formed shell-shaped and has two opposite longitudinal side sections, which are interconnected via a central portion.
- the longitudinal side sections each have edge-side side surfaces, on each of which a partial light bundle coupled in at a relatively large emission angle to the optical axis is totally reflected in the direction of the light outcoupling side.
- These longitudinal side sections extend on both sides of the longitudinal center plane, so that a smaller radiation width in the transverse direction is achieved by the converging deflection of the partial light bundle through the longitudinal side section. It can thus be effected in a simple manner a rectangular illumination of the road.
- the lens has longitudinal sections, which consist on the one hand of a rising side wing and on the other hand of a sloping side wing.
- the rising side wing has a side surface on which a part of the coupled light beam is totally reflected so that the light beam is coupled in the direction of the optical axis or the longitudinal center plane while cutting the same.
- the sloping side wing has only surfaces on which the coupled-in light beam is refracted in the direction of the longitudinal central axis without cutting the longitudinal central axis.
- a light unit can thus be created, the same in the transverse direction - A -
- the longitudinal side sections of the lens may be formed symmetrically or asymmetrically to the longitudinal central axis.
- a rectangular area is advantageously illuminated, with the lighting unit being located substantially in a center / center of the road surface.
- a rectangular area is illuminated, wherein the lighting unit is arranged at a distance from the center / center thereof.
- side surfaces and a front surface of a first longitudinal side portion may be shaped such that the coupled-in light beam is coupled out at an acute deflection angle.
- a homogenization of the luminous flux is effected, which favors the generation of a homogeneous light distribution.
- the side face and a front face of a second longitudinal side section are shaped such that the light bundle coupled into the second longitudinal side section is coupled out under cutting of the optical axis at a relatively large deflection angle.
- an asymmetrical light distribution can thus be generated so that the lighting unit can be arranged, for example, on the edge of a street to be illuminated. Furthermore, a linear illumination is favored thereby.
- a front surface of the center section facing away from the luminous element is oval-shaped and a light coupling surface facing the luminous element is bell-shaped.
- the oval outcoupling surface front surface of the center section
- the maximum emission angle is determined by edge-side regions.
- surface of the longitudinal section is determined.
- the luminous element is designed as an LED luminous element, which has an opening angle of greater than 70 °. With a smaller opening angle of the luminous element, the total reflection surfaces of the side surface sections would not be effective.
- 1 is a plan view of a lens of a lighting unit
- FIG. 2 shows a longitudinal section through a lighting unit according to a first embodiment
- FIG. 5 shows a schematic vertical section through the lighting unit used as a street lamp according to the first embodiment for the symmetrical illumination of a road space
- Fig. 6 is a schematic plan view of the street to be illuminated, wherein the Lighting unit is arranged according to the first embodiment in the center of the illumination surface,
- FIG. 7 shows a cross section through a lighting unit according to a second embodiment
- FIG. 9 shows a schematic vertical section through the lighting unit used as a street lamp according to the second embodiment for the asymmetrical illumination of a road space
- FIG. 10 is a schematic plan view of the street to be illuminated, wherein the lighting unit is arranged according to the second embodiment off-center of the illumination surface,
- FIG. 11 is a perspective view of a lens according to another embodiment
- FIG. 13 shows a light intensity distribution of the lighting unit according to FIG. 12 in the transverse direction of the same.
- a lighting device for roads, paths and the like may, for example, a non-illustrated frame-shaped housing, which is connected via a foot to a mast. At least one light module is integrated in the housing, so that a street area or a street space can be illuminated when the lighting device is switched on.
- the housing of the lighting The device is arranged at a predetermined distance from the road surface, wherein the at least one light module extends parallel to the road surface.
- the lighting modules are rectilinear and / or elongated and extend in a common plane of extension.
- the lighting modules can be arranged such that the lighting device is arranged in the shape of a frame or in a line or in a star or cross shape.
- the lighting modules have a number of light units 1 arranged in rows, which are each arranged on a common carrier within a recess of the housing.
- the carrier or the number of light units 1 of a light module (for example, eight light modules) are closed by a common transparent cover.
- the lighting unit 1 essentially has a light-emitting element 2 designed as an LED chip and a lens 4 arranged in front of it in the main radiation direction 3.
- the lens 4 is formed shell-shaped or in cross-section bat-wing-shaped and has on the one hand two with respect to a longitudinal center plane ML opposite longitudinal side sections 5 and on the other a longitudinal section 5 connecting the middle section 6.
- the light unit 1 illustrated in FIGS. 1 to 6 has identically formed longitudinal side sections 5, so that the lens 4 is not only symmetrical with respect to the longitudinal center plane ML but also symmetrically with respect to a transverse center plane MQ.
- the LED light-emitting element 2 is positioned on a light input side 7 of the lens 4, partially in a recess 8, at a distance from a bell-shaped light coupling surface 9 of the lens 4.
- the bell-shaped light coupling surface 9 is preferably rotationally symmetrical with respect to an optical axis 10 of the luminous element 2 or the lens 4 is formed.
- the light coupling surface 9 serving as coupling optics and the light output surface 12 of the lens 4 are thus shaped in the longitudinal direction L of the lens 4 in such a way that a light intensity distribution curve Ki (light distribution characteristic) is produced in which the light intensity is determined from an emission angle ⁇ whose value is the optical axis 10 is zero, increases in the longitudinal direction corresponding to a following tangent function.
- Ki light distribution characteristic
- FIG. 4 additionally shows a light intensity distribution J of the LED lighting element 2 designed as a Lambertian radiator.
- the light beams 13 at the boundary surfaces of the lens 4 are each broken away from the optical axis 10 or transverse center plane MQ such that the maxima arise in the regions of the first characteristic angles ⁇ KL, - ⁇ KL ,
- the decrease in the light intensity distribution above the magnitude characteristic ⁇ K L decreases cosinusoidally.
- a length I of a road surface 14 to be illuminated is predetermined. Due to the geometry of the lens 4 in transverse direction Q is given a width b of the illuminated road surface 14, as shown in FIG.
- the lighting unit 1 is located in a center or center Z of this rectangular illumination surface fourteenth
- the longitudinal side sections 5 have an edge side surface 15 and a front surface 16 arranged on the light extraction side 11, so that a partial light bundle 17 coupled in at a relatively large angle to the optical axis 10 on the side surface 15 is totally reflected and emitted steeper at the front surface 16 as a corresponding in the longitudinal direction L coupled partial light beam 17 'of the lens 4.
- the longitudinal side sections 5 thus have a relatively collecting function of coupled at a relatively large angle to the optical axis 10 light beams in Transverse direction Q in comparison to the coupled at a large angle to the optical axis 10 light beams 17 'in the longitudinal direction L.
- the light intensity distribution according to the first exemplary embodiment is symmetrical with respect to the longitudinal center plane M L and the transverse center plane MQ.
- the center section 6 of the lens 4 preferably has a scattering effect, wherein the scattering effect in the longitudinal direction L according to FIG. 2 is also extended to the lateral edge regions.
- a lens 22 is provided which is asymmetrical in the transverse direction Q, see FIG. 7.
- the lens 22 is substantially formed symmetrically to the transverse central axis MQ.
- the lens 22 has a first longitudinal side section 5, which coincides with the longitudinal side section 5 of the lens 4, as well as an oppositely disposed second section 5.
- th longitudinal side portion 23 which is formed in cross section bulge than the first longitudinal side portion 5.
- the bulbous second longitudinal side portion 23 has an arcuate side surface 24, at which the partial light bundle 17 "coupled in at a relatively steep emission angle is totally reflected at a relatively large deflection angle and refracted at a front surface 26 of the second longitudinal side portion 23 while cutting the optical axis 10 or Longitudinal plane ML is emitted.
- a light beam 18 emitted by the luminous element 2 transversely to the longitudinal center plane ML is deflected at a larger deflection angle ⁇ 1 than a corresponding light beam 19 which strikes the first longitudinal side section 5 and is deflected at an acute deflection angle ⁇ 1.
- the road surface 14 can be illuminated rectangular, although the lighting unit 21 is not located in the center Z of the road surface 14, but laterally offset to this.
- the asymmetric effect of the lighting unit 21 can be further increased, so that the lighting unit 21 can be positioned, for example, on an edge 27 of the road surface 14.
- a lighting unit 31 is provided which - as the lighting unit 21 according to the second embodiment - in the transverse direction Q has asymmetrically formed longitudinal side portion 33, 34.
- the first longitudinal side section 33 is shown as an ascending side tenulatel formed, which is arranged substantially on a first side of a longitudinal center plane M L of the lens 32.
- a second longitudinal side portion 34 is formed as a sloping side wing disposed on an opposite side of the longitudinal center plane ML.
- the rising side wing 33 and the sloping side wing 34 are connected to each other via a central portion 35 which extends substantially in a region close to the longitudinal center plane ML.
- the rising side wing 33 has an outwardly curved Lichtein coupling surface 36 are refracted by the light emitted from the light emitting element 2 37 substantially in the direction of a steep side surface 38 at which they are so totally reflected that the light rays 37 on a front surface 39th of the rising side wing 33 are coupled out.
- the front surface 39 extends arcuately from a front edge of the side surface 38; in particular, a front portion of the side surface 38 extends at a relatively steep angle, that is, the front portion of the side surface 38 extends below one relatively small acute angle to the longitudinal center plane ML, SO that a greater proportion of light than according to the second embodiment beyond the longitudinal center plane M L on the opposite with respect to the longitudinal center plane M L side is reflected or coupled via the front surface 39.
- the sloping side wing 34 has on a light-emitting element 2 side facing an arcuate Lichtein coupling surface 40 and a front surface 41 and a counter to the main emission direction sloping side surface 42.
- the side surface 42 By forming, in particular, the side surface 42, the light beams 43 coupled into the sloping side wings 34 are only broken, specifically in the direction of the longitudinal center axis ML of the lens 32.
- the center section 35 has a light output surface, so that coupled-in light beams 44 are broken away on both sides of the longitudinal center plane ML.
- a light intensity distribution K ' 2 is generated in the transverse direction Q, which has a greater asymmetry in comparison to the light intensity distribution K 2 of the second embodiment according to FIG.
- LED chips having an opening angle of greater than 70 ° are used as light-emitting elements.
- the contours of the lenses 4, 22 are formed such that the tangential increase of the light intensity distribution K 1 , K 2 is in a radiation angle range between 0 and 75 °.
- the tangential rise region of the emission angles ⁇ lies in a range from 0 to 55 °.
- the emission angles ⁇ may also extend only in regions according to the tangent function; In particular, in a region close to the optical axis 10, the course can run with a greater or lesser increase.
- the lighting device can be used for street lighting but also in the interior, for example in kitchen or living room furniture.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009021182A DE102009021182A1 (en) | 2009-05-13 | 2009-05-13 | Lighting device for roads |
PCT/EP2010/056453 WO2010130732A1 (en) | 2009-05-13 | 2010-05-11 | Lighting device for streets |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2430360A1 true EP2430360A1 (en) | 2012-03-21 |
Family
ID=42557381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10730388A Withdrawn EP2430360A1 (en) | 2009-05-13 | 2010-05-11 | Lighting device for streets |
Country Status (5)
Country | Link |
---|---|
US (1) | US8469552B2 (en) |
EP (1) | EP2430360A1 (en) |
CN (1) | CN102803835B (en) |
DE (1) | DE102009021182A1 (en) |
WO (1) | WO2010130732A1 (en) |
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2010
- 2010-05-11 EP EP10730388A patent/EP2430360A1/en not_active Withdrawn
- 2010-05-11 WO PCT/EP2010/056453 patent/WO2010130732A1/en active Application Filing
- 2010-05-11 CN CN201080027568.2A patent/CN102803835B/en not_active Expired - Fee Related
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2011
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EP2039985A2 (en) * | 2007-09-20 | 2009-03-25 | Siteco Beleuchtungstechnik GmbH | LED lighting device with asymmetric light distribution, in particular for street lighting |
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US20120120666A1 (en) | 2012-05-17 |
WO2010130732A1 (en) | 2010-11-18 |
CN102803835A (en) | 2012-11-28 |
CN102803835B (en) | 2015-06-10 |
US8469552B2 (en) | 2013-06-25 |
DE102009021182A1 (en) | 2010-11-18 |
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