EP2475926A1 - Système optique à ensemble de distribution de lumière - Google Patents

Système optique à ensemble de distribution de lumière

Info

Publication number
EP2475926A1
EP2475926A1 EP10724909A EP10724909A EP2475926A1 EP 2475926 A1 EP2475926 A1 EP 2475926A1 EP 10724909 A EP10724909 A EP 10724909A EP 10724909 A EP10724909 A EP 10724909A EP 2475926 A1 EP2475926 A1 EP 2475926A1
Authority
EP
European Patent Office
Prior art keywords
board panel
internal
board
panel
leds
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.)
Granted
Application number
EP10724909A
Other languages
German (de)
English (en)
Other versions
EP2475926B1 (fr
Inventor
Dariusz Litwin
Tadeusz Kryszczynski
Jacek Galas
Adam Czyzewski
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.)
Instytut Badawczy Drog I Mostow
Instytut Optyki Stosowanej
Original Assignee
Instytut Badawczy Drog I Mostow
Instytut Optyki Stosowanej
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 Instytut Badawczy Drog I Mostow, Instytut Optyki Stosowanej filed Critical Instytut Badawczy Drog I Mostow
Publication of EP2475926A1 publication Critical patent/EP2475926A1/fr
Application granted granted Critical
Publication of EP2475926B1 publication Critical patent/EP2475926B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • 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
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • 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
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • 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
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • 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 subject matter of the invention is a light distribution array optical system, in particular for the road signs of variable content, with the application of an array with LEDs as sources of light.
  • the EP 0930600 patent description discloses light distribution optical systems used in road signs of variable content, comprising individual optical systems provided with a l ight emitting diode (LED), a lens stop, a converging lens and a diverging lens located coaxial ly in a single housing.
  • the distance between the lenses has been selected so that sunlight from the outside is maximally reduced either by the lens stop or the housing wall. This prevents the phantom phenomenon which manifests itself as apparent light caused by sunray reflecting from reflectors or other optical system elements.
  • a disadvantage of individual optical systems is the occuiTence of numerous optical elements of compl icated geometry located in a separate housing, which aggravates instal lation and maintenance. Moreover, such a solution does not ensure good visibility of the content displayed from a greater distance.
  • optical systems provided with optical elements integrated with a LED array, which create a light beam.
  • Such systems may be provided with optical filters, rod lenses, stepped lenses or other elements limiting and forming light penetrating the system. Additional optical elements make it possible to shape the l ight stream on the system output and eliminate the glare by the point source of light or the phantom effect.
  • the EP 1091 167 patent description discloses a traffic lights optical system with an arrangement of LEDs in which beams of light emitted by the diodes are formed by an internal board panel with converging lenses and Fresnel lenses and the system output features an optical material stop with its internal surface featuring elements limiting distribution of the light penetrating the system and preventing the phantom phenomenon.
  • the DE 102005002535 patent description discloses a LED array optical system of light distribution to road signs, in which the element limiting and forming the beam of light penetrating the system comprises an uniform flat board made of optical organic material or glass and a lens located between the board and the LED.
  • the board internal and external surfaces are covered with an aperture surface created by perforated diaphragms with circular openings transmitting the light and located in the optical axis of each LED.
  • the stop material only part of the light emitted by the LEDs passes through the circular openings in the stop, and the remaining part is stopped by the stop material.
  • the light distribution array optical system provided with an array of LEDs as sources of light and the internal and external board panels, located in parallel and forming beams of light emitted by the LEDs, at least one of which features a surface limiting the volume of light penetrating the system, in accordance with the invention is characterised by the fact that on the internal board panel input surface, on the side of the LEDs, there are focusing elements constituting convexities located in the optical axis of each LED, having an aspherical shape and a radius of curvature increasing towards base.
  • the vertical radius R of the convexity amounts to 0.3 to 0.5 of distance s between the optical axes of adjacent LEDs.
  • the total thickness d of the internal board panel amounts to L58 to 2.08 of the s distance.
  • the external board panel has at least two breaking surfaces of common axis of symmetry and square outline, a concave surface and a spherical convex surface.
  • the breaking surfaces in frontal projection cover a square array of four adjacent convexities on the internal board panel.
  • the surface limiting the volume of light penetrating the system is the aperture surface being the external surface of the internal board panel, with circular windows located in the optical axis of each LED.
  • the internal board panel side length is the k-multiplicity of the s distance where k is a natural even number from 2 to 100. It is also advantageous if the aperture surface of the internal board panel is created of perforated diaphragm adhering to the panel.
  • the aperture surface of the internal board panel is a profiled surface comprising symmetrical convex segments in the shape of truncated cones, with circular windows constituting their frontal surfaces.
  • the external board panel is made of a uniform board form of an outline matching the board panel internal outline, while the output surface is a spherical convex surface.
  • the breaking surfaces are located on separate board forms, the first and the second, of which the first one is located from the side of the internal board panel.
  • breaking surfaces are located from the side of the gap separating the board forms, and the other surfaces are flat. It is also advantageous if the output surface is a spherical convex surface and the concave surface is located on the first board form from the side of the internal board panel.
  • the output surface is a concave surface and the spherical convex surface is located on the first board form from the side of the second board form.
  • the concave surface has the shape of a cone side surface of a vertical angle within the range from 140° to 1 75°.
  • the concave surface has the shape of a tetragonal pyramid of a vertical angle measured in the standard plane to the panel side within the range from 140° to 1 75°
  • ⁇ solution in accordance with the invention has a compact design obtained thanks to the integrated system of the LED array with the board panels.
  • the panels cover at least one square array of LEDs constituting sources of light. Thanks to the board panel geometry, beams of light emitted by the diodes are formed and adj usted by the external and the internal board panels and after that they spread in a direction paral lel-like to the optical axis of the LEDs and the focusing elements, and the watching person sees all the diodes identically as points of light of identical brightness intensity.
  • Light distribution array optical system design parameters result from the requirements pertaining to the visibility of road signs of variable content.
  • Diode image obtained in a system in accordance with the invention is very well visible from large distances, and the system design as well as the application of aperture surface ensure elimination of the phantom phenomenon. Moreover, the panel design allows to produce them as board forms of dimensions adjusted to typical dimensions of road signs of variable content, which facilitates their production and maintenance and ensures greater durability during an extended period of operation.
  • fig. 1 shows a light distribution array optical system in cross-section
  • fig. 2 shows the internal board panel in front view
  • fig. 3 shows the board panels in cross-section
  • fig. 4 shows the external board panel made of a uniform board form in cross-section
  • fig. 5 shows another execution of the board panels in cross-section
  • fig. 6 shows another execution of the light distribution array optical system in side view
  • fig. 7 shows the internal board panel from fig. 6 in front view
  • fig. 8 shows the external board panel with a flat output surface in cross-section
  • fig. 9 shows the external board panel with a convex output surface in cross-section
  • fig. 10 shows the external board panel with a concave output surface in cross-section
  • fig. 1 1 shows the board form with a concave surface in the shape of a tetragonal pyramid in cross-section.
  • the light distribution array optical system is provided with an array of LEDS 1 constituting sources of light and two parallel board panels, internal 3 and external one, which form beams of light emitted by the LEDs 1 .
  • the internal board panel 3 input surface features, on the side of the LEDs 1 , focusing elements constituting convexities 2 located in the optical axis of each LED 1 .
  • the convexities 2 have an aspherical shape and a radius of curvature increasing towards the base.
  • the vertical radius R. of convexity 2 amounts to 0.3 to 0.5 of the s distance between the optical axes of ad jacent LEDs 1
  • the total thickness d of the internal board panel 3 amounts to 1 .58 to 2.08 of the s distance.
  • the external board panel has at least two breaking surfaces of common axis of symmetry and square outline, a concave surface 7 and a spherical convex surface 8.
  • the breaking surfaces cover a square array of four adjacent convexities 2 on the internal board panel 3.
  • the surface limiting the light penetrating the system is constituted by the aperture surface 4, 4' being the internal board panel 3 external surface.
  • the aperture surface 4. 4 1 has circular windows 5 located in the optical axis of each LED 1 .
  • the internal board panel 3 side length is the k-multiplicity of the s distance where k is a natural even number from 2 to 1 00.
  • the aperture surface 4 of the internal board panel 3 is formed of a perforated diaphragm.
  • the external board panel is made of an uniform board form 6 of an outline matching the board panel 3 internal outline, subject to the output surface being a spherical convex surface 8 and the concave surface 7 having the shape of a cone side surface.
  • the concave surface 7' has the shape of tetragonal pyramid sides.
  • the smallest design module realising a system in accordance with the invention features sides of the internal board panel 3 of a length equal to the double s distance between the optical axes of adjacent LEDs 1 and covers a square array of four adjacent convexities 2 formed on the input surface e from the side of the LED array .
  • the same outline of the sides in front view is featured in the uniform board form 6 constituting part of the module.
  • the breaking surfaces are located on separate board forms 1 1 and 12, the first one located from the side of the internal board panel 3 and the second one with the output surface seen directly by the watching person.
  • the panel ' s output surface is constituted by the. aspherical convex surface 8 while the concave surface 7 is located on the first board form 1 1 from the side of the internal board panel 3.
  • a separating layer 1 0 made of optical material transmitting light.
  • the internal board panel 3 has a profiled aperture surface 4' comprising symmetrical convex segments 9 in the shape of truncated cones, the frontal surfaces of which are made of circular windows 5.
  • the external board panel comprises separate board forms 1 1 and 12 subject to the breaking surfaces being located from the side of the gap separating both forms and the other surfaces being flat.
  • the concave surface 7 is made on the first board form 1 1 while the spherical convex surface 8 is on the second form.
  • the profiled aperture surface 4 faci litates the formation of a beam of light going out of the system and limits the volume of the external light penetrating the system thanks to reflection and dispersion on the pro fi led surface.
  • Fig. 7 shows the aperture surface 4' made of four symmetrical convex segments 9 shown in fig. 6. Frontal surfaces of the segments have circular windows 5 of geometrical axes located at a distance s equal to the s distance between the optical axes of adjacent LHDs 1 constituting part of the system.
  • the external board panel made of two separate board forms 1 1 and 12 with breakin surfaces forming the beams going out of the system towards the watching person may feature miscellaneous locations of the breaking surfaces with respect to each other.
  • the external board panel surfaces are located in an order reverse to that in the external board panel shown in fig. 6.
  • the external board panel output surface is a spherical convex surface 8 and the concave surface 7 is located on the opposite side of the panel, on the first board form 1 I .
  • the external board panel output surface is a concave surface 7 and the spherical convex surface 8 is located on the first board form 1 1 , from the side of the other board form 12.
  • Fig. 1 1 shows another execution of the board form constituting part of the external board panel, on which there is a concave surface 7.
  • the concave surface 7' is in the shape of the sides of a tetragonal pyramid due to which the external edges of the surface are on the same plane.
  • the internal board panel 3 and the external board panel forms are made of optical organic material of a refraction index from 1 .49 to 1 .55, determined at the wave length of 587.56 mil.
  • the shape of convexity 2 is simi lar to a rotating paraboloid.
  • the aspherical surface of convexity 2 arising from the extension of the conical curvatures has the base diameter ⁇ ⁇ , and its shape is determined by the ⁇ eccentric.
  • Circular windows 5 of aperture surface 4 and 4 " have the active diameter ⁇ .
  • Total thickness d of board panel 3 is measured along the optical axis.
  • Distance g between circular windows 5 and the external board panel has been selected appropriately to the geometry of the system optical elements and does not exceed distance s between the optical axes of adjacent LEDs 1 .
  • Distance c between the frontal surface of each diode and the surface of convexity 2 is selected appropriately to the light distribution solid angle for a speci fic type of a diode, in particular of semi-spherical shape. Diodes may come in numerous colour versions, depending on requirements.
  • the vertical angle of concave surface 7, T measured in the standard axial plane to the side of the internal board panel was from 140° to 1 75°. In so executed a system, the light distribution flat angle on the system output did not exceed 12°.
  • internal board panel 1 may be formed by means of plastic moulding, injection or another method uti lised in plastic processing.
  • the system may comprise internal board panel 3 of the shape shown in fig. 1 or fig. 2, and any external panel of the shape shown in fig. 1 , 4, 5, 6, 8, 9 and 10.
  • Panel dimensions may be adjusted to typical optical system array configurations in this type of boards, with a square or rectangular outline. Panels may also be connected with their sides.
  • Active surface of the aperture surface 4 and 4 ' is determined by the surface of circular windows 5 of the active diameter ⁇ . The relation between the ⁇ active diameter of circular windows 5 and the ⁇ 0 diameter of convexity 2 amounts to 0. 1 5 to 0.45.
  • Flat aperture surface 4 may be executed in the form of a perforated diaphragm made of thin, blackened sheet metal, foil or other coating not transmitting light, placed on the panel.
  • the volume of light penetrating the system is limited due to refraction and dispersion of the light falling on conical surfaces around circular windows 5.
  • the surfaces may be transparent, mat or covered with appropriate coating.
  • a beam of sunlight which passes through circular windows 5 inside the system becomes weakened in the panel material as a result of dispersion and absorption, or leaves the system. Residual light which returns through circular windows 5 is not seen by the watching person and does not interfere with the sign content.
  • the external board panel output surface may be covered with an anti- reflective layer transmitting light.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Led Device Packages (AREA)
  • Optical Communication System (AREA)
  • Glass Compositions (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

La présente invention se rapporte à un système optique à ensemble de distribution de lumière pourvu d'un ensemble de LED (1) en tant que sources de lumière et panneaux interne (3) et externe, situés parallèlement et formant des faisceaux de lumière émis par les LED (1), dont au moins un représente une surface limitant le volume de lumière pénétrant dans le système. Sur la surface d'entrée de panneau interne (3), sur le côté des LED (1) se trouvent des éléments de concentration constituant des convexités (2) situées dans l'axe optique de chaque LED (1), ayant une forme asphérique et un rayon de courbure augmentant vers la base, le rayon vertical R de convexité (2) étant compris entre 0,3 et 0,5 de distance s entre les axes optiques de LED adjacentes (1), et l'épaisseur totale d du panneau interne (3) étant comprise entre 1,58 et 2,08 de distance s, et le panneau externe comporte au moins deux surfaces de rupture d'axe de symétrie commun et de contour carré, une surface concave (7, 7') et une surface convexe sphérique (8), où les surfaces de rupture en saillie frontale recouvrent un ensemble carré de quatre convexités adjacentes (2) sur le panneau interne (3). La surface limitant le volume de lumière pénétrant dans le système est la surface d'ouverture (4, 4'), c'est-à-dire la surface externe du panneau interne (3) pourvue de fenêtres circulaires (5) situées dans l'axe optique de chaque LED (1).
EP10724909.6A 2009-09-09 2010-04-12 Système optique matriciel de distribution de lumière Not-in-force EP2475926B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL388995A PL216006B1 (pl) 2009-09-09 2009-09-09 Macierzowy uklad optyczny rozsylu swiatla
PCT/PL2010/000027 WO2011031170A1 (fr) 2009-09-09 2010-04-12 Système optique à ensemble de distribution de lumière

Publications (2)

Publication Number Publication Date
EP2475926A1 true EP2475926A1 (fr) 2012-07-18
EP2475926B1 EP2475926B1 (fr) 2013-11-13

Family

ID=42338149

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10724909.6A Not-in-force EP2475926B1 (fr) 2009-09-09 2010-04-12 Système optique matriciel de distribution de lumière

Country Status (4)

Country Link
EP (1) EP2475926B1 (fr)
PL (1) PL216006B1 (fr)
UA (1) UA101080C2 (fr)
WO (1) WO2011031170A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3182190A1 (fr) * 2015-12-17 2017-06-21 Instytut Optyki Stosowanej Système optique pour la distribution de la lumière à partir d'un seul pixel du panneau de signalisation à message variable
EP3182188A1 (fr) 2015-12-17 2017-06-21 Instytut Optyki Stosowanej Système optique pour un seul pixel de panneau de signalisation a message variable

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081361A1 (fr) * 1981-12-08 1983-06-15 LUCAS INDUSTRIES public limited company Feu
AT500056B8 (de) * 1998-01-19 2007-02-15 Swarco Futurit Verkehrssignals Optikelement für verkehrszeichen, anzeigetafeln oder dgl.
DE502006007871D1 (de) * 2005-02-28 2010-10-28 Osram Opto Semiconductors Gmbh LED-Anzeigevorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011031170A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3182190A1 (fr) * 2015-12-17 2017-06-21 Instytut Optyki Stosowanej Système optique pour la distribution de la lumière à partir d'un seul pixel du panneau de signalisation à message variable
EP3182188A1 (fr) 2015-12-17 2017-06-21 Instytut Optyki Stosowanej Système optique pour un seul pixel de panneau de signalisation a message variable

Also Published As

Publication number Publication date
UA101080C2 (ru) 2013-02-25
WO2011031170A1 (fr) 2011-03-17
PL388995A1 (pl) 2011-03-14
EP2475926B1 (fr) 2013-11-13
PL216006B1 (pl) 2014-02-28

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