EP2863111A1 - Dispositif d'éclairage avec system optique pour contrôler l'index UGR et la luminance - Google Patents

Dispositif d'éclairage avec system optique pour contrôler l'index UGR et la luminance Download PDF

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Publication number
EP2863111A1
EP2863111A1 EP20140189107 EP14189107A EP2863111A1 EP 2863111 A1 EP2863111 A1 EP 2863111A1 EP 20140189107 EP20140189107 EP 20140189107 EP 14189107 A EP14189107 A EP 14189107A EP 2863111 A1 EP2863111 A1 EP 2863111A1
Authority
EP
European Patent Office
Prior art keywords
lighting device
lenses
grid
light source
optical element
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
EP20140189107
Other languages
German (de)
English (en)
Other versions
EP2863111B1 (fr
Inventor
Roberto Efrem Franzosi
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.)
Artemide SpA
Original Assignee
Artemide SpA
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Publication date
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Publication of EP2863111A1 publication Critical patent/EP2863111A1/fr
Application granted granted Critical
Publication of EP2863111B1 publication Critical patent/EP2863111B1/fr
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Anticipated expiration legal-status Critical

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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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
    • 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
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear 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 present invention relates to a lighting device provided with an optical system for the control of UGR index and luminance.
  • the invention is intended, in particular, to provide "dark” effect lamps (i.e. having emission above 65° lower than a predetermined threshold) for interior lighting.
  • a prismatic plate of this type is schematically shown in figures 1 and 2 .
  • Plate 30 commonly made of transparent methacrylate, has a smooth entry face 31 which is mounted towards the inside of the lighting device (towards the light sources), and a prismatic exit face 32, consisting of cones 33 with angle at the apex of 120°.
  • the bases of cones 33 are cut in a hexagonal shape so as to optimize the composition of the structure, which thus proves to be a honeycomb.
  • plate 30 works effectively, allowing an excellent control of UGR and luminance at 65° and higher, when the light rays, and in particular the light rays, the most critical to control, grazing on the entry face 31 of plate 30 (i.e. having a high angle of incidence ⁇ , the angle of incidence being the angle between the direction of the light ray impinging on a surface and an axis perpendicular to the surface at the point of incidence of the light ray), pass through "rising" surfaces 34 of the cones ( figure 1 ).
  • the light ray emerges from the exit face 32 with a satisfactory (for example lower than the threshold required by the regulations) emission angle ⁇ (angle between the direction of the light ray exiting from a surface and an axis perpendicular to the surface at the exit point of the light ray).
  • This condition causes the light intensity higher than 65° not to be zero but have a certain value, which may be critical or not depending on the emitting surface of the device. This is because luminance is defined as the ratio between the light intensity and the apparent emitting surface.
  • An object of this invention is to provide a lighting device provided with an optical system for the control of UGR index and luminance, in particular adapted to make “dark” effect lamps, which overcomes the drawbacks of the prior art mentioned herein.
  • an object of the invention is to provide a lighting device which enables an efficient control of UGR and luminance even with small emitting surfaces.
  • the present invention therefore relates to a lighting device provided with an optical system for the control of UGR index and luminance, in particular to make "dark” effect lamps, as defined in essential terms in the appended claim 1 and, in its additional features, in the dependent claims.
  • Figure 3 schematically shows a controlled-emission lighting device 1, in particular adapted to make “dark” effect lamps.
  • the lighting device 1 is precisely a device for interior lighting and in particular for workplace lighting.
  • the lighting device 1 comprises at least one light source 2, housed in a casing 3, and an optical system 4 for the control of UGR index and luminance.
  • the light source 2 may be of various types, for example a row of LEDs.
  • the casing 3 may be variously shaped, also according to the use of the lighting device 1 (such as a ceiling lamp).
  • the casing 3 is provided with an internal chamber 5, which houses the light source 2 and has an emission aperture 6 delimited by a peripheral edge 7, from which the light emitted by the light source 2 exits.
  • the optical system 4 closes the emission aperture 6 and intercepts the emission of the light source 2.
  • the optical system 4 comprises a multi-lens optical element 8, formed by a plurality of lenses 9 arranged side-by-side along two directions, and by a grid 10, located on an inner face 11 (facing towards the inside of the lighting device 1 and towards the light source 2) of the optical element 8.
  • the optical element 8 is substantially flat and extends between the inner face 11 and an outer face 12, opposite the inner face 11 and facing, in use, towards the outside of the lighting device 1 and thus towards the room to be lighted.
  • the optical element 8 is spaced apart from the light source 2, in particular being located at a distance from the light source 2 larger than the thickness (distance between the inner face 11 and the outer face 12) of the optical element 8.
  • the optical element 8 is a monolithic element of a transparent polymer material, such as PMMA.
  • the lenses 9 are in contact with one another along respective sides.
  • Each lens 9 extends along a central axis (optical axis) between an entry surface 13, facing towards the inside of the lighting device 1, and thus towards the light source 2, and an exit surface 14, opposite the entry surface 13 and thus directed towards the outside of the lighting device 1 and towards the room to be lighted.
  • the lenses 9 are plano-convex lenses, i.e. having respective opposite surfaces which are a plane surface and a convex surface, respectively, having a predetermined bending radius.
  • each lens 9 has the entry surface 13 which is a plane surface, and the exit surface 14 which is a convex surface.
  • the entry surfaces 13 form the inner face 11, substantially plane, of the optical element 8; the outer face 12 is formed by a plurality of convex surfaces, consisting of respective exit surfaces 14 of lenses 9.
  • the lenses 9 are joined to one another along respective common lateral faces 15.
  • the lenses 9 are square lenses, i.e. lenses having a square shape in plan view.
  • the grid 10 has a plurality of meshes 16 aligned to respective lenses 9 and delimited by lateral walls 17.
  • the grid 10 is arranged on the inner face 11 of the optical element 8 and in contact with the inner face 11; the lateral walls 17 contact the inner face 11 of the optical element 8 and are arranged along the faces 15 which join the lenses 9.
  • the lateral walls 17 have respective bottom contact surfaces 21, resting on the inner face 11 of the optical element 8, and respective top free surfaces 22 opposite the contact surfaces 21.
  • each lateral wall 17 has a pair of opposite lateral sides 23 which join the contact surfaces 21 and the free surfaces 22.
  • the lateral sides 23 have light-absorbing black surfaces, while the free surfaces 22 are diffusive white surfaces having a high reflection coefficient, so as to recover inside the casing 3 the light impinging on the grid 10.
  • the free surfaces 22 are made of/coated with a white polymer material having high reflectance, for example an overall reflectance of visible light of 95% or higher.
  • the grid 10 is dimensioned so as to limit the angle of incidence ⁇ of the light rays that impinge on the entry surfaces 13 of the lenses 9 (the angle of incidence ⁇ being the angle formed by the direction of a light ray impinging on an entry surface 13 with an axis perpendicular to the entry surface 13 at the point of incidence); precisely, the grid 10 and in particular the lateral walls 17 are dimensioned so that only light rays with angles of incidence ⁇ (with respect to the entry surfaces 13) higher than a minimum threshold ⁇ min impinge on the lenses 9 (on the entry surfaces 13), so as to limit or avoid internal reflections that generally grazing rays (with high angle of incidence) undergo, which are difficult to control.
  • the lenses 9 and in particular the exit surfaces 14 thereof are then shaped so as to project the light rays that pass through the grid 10 with emission angles ⁇ (the emission angle ⁇ being the angle between the direction of the light ray exiting from the exit surface 14 and an axis perpendicular to the exit surface 14 at the exit point of the light ray) lower than a threshold value ⁇ Max for example 65° as indicated by the current regulations.
  • the lateral walls 17 have a thickness (distance between the opposite lateral sides 23) greater than the height (distance between the contact surface 21 and the free surface 22).
  • the lateral walls 17 have a thickness of about 1.5-2.5 mm and a height of about 0.5-1.5 mm.
  • the dimensions of meshes 16 depend on the dimensions of the lenses 9, in particular on the length of the sides (in plan view) of the lenses 9, which for example may be about 8-10 mm.
  • the bending radius of the lenses 9 (precisely of the exit surfaces 14 thereof) is in general comparable with the length of the sides of the lenses 9, in particular being equal to or slightly greater than the length of the sides of the lenses 9, for example about 8-12 mm.
  • the lenses 9 have sides of 9.2 mm and a bending radius of 11 mm.
  • the optical element 8 is coupled to or facing towards a diffusive sheet 25, the diffusive sheet, made of suitable light-permeable and diffusive material (such as a polycarbonate film), has the function of making the emission of the lighting device 1 more homogeneous without altering the angles of emission.
  • a diffusive sheet 25 the diffusive sheet, made of suitable light-permeable and diffusive material (such as a polycarbonate film), has the function of making the emission of the lighting device 1 more homogeneous without altering the angles of emission.
  • the optical system 4 allows obtaining the desired emission (also of the "dark” type) without requiring further optical elements on the light source 2; in particular, if the light source 2 is formed by a plurality of LEDs, the LEDs do not require their own lenses or optics associated with the single LEDs.
  • the optical system 4 of the invention in fact operates independently of the light source 2 and can be used with different light sources; therefore, implementing a specific optical system for different light sources or providing the light sources with dedicated optics is not necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP14189107.7A 2013-10-15 2014-10-15 Dispositif d'éclairage avec système optique pour contrôler l'index UGR et la luminance Active EP2863111B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001711A ITMI20131711A1 (it) 2013-10-15 2013-10-15 Apparecchio di illuminazione con sistema ottico per il controllo di indice ugr e luminanza

Publications (2)

Publication Number Publication Date
EP2863111A1 true EP2863111A1 (fr) 2015-04-22
EP2863111B1 EP2863111B1 (fr) 2016-11-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14189107.7A Active EP2863111B1 (fr) 2013-10-15 2014-10-15 Dispositif d'éclairage avec système optique pour contrôler l'index UGR et la luminance

Country Status (2)

Country Link
EP (1) EP2863111B1 (fr)
IT (1) ITMI20131711A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020104340A1 (de) 2020-02-19 2021-08-19 Vossloh-Schwabe Deutschland GbmH Beleuchtungseinrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080030974A1 (en) * 2006-08-02 2008-02-07 Abu-Ageel Nayef M LED-Based Illumination System
EP2357399A1 (fr) * 2010-02-16 2011-08-17 Koito Manufacturing Co., Ltd. Unité optique
EP2461086A1 (fr) * 2009-07-31 2012-06-06 Appotronics Corporation Limited Dispositif d'éclairage pour éclairage scénique avec efficacité de combinaison de lumière élevée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080030974A1 (en) * 2006-08-02 2008-02-07 Abu-Ageel Nayef M LED-Based Illumination System
EP2461086A1 (fr) * 2009-07-31 2012-06-06 Appotronics Corporation Limited Dispositif d'éclairage pour éclairage scénique avec efficacité de combinaison de lumière élevée
EP2357399A1 (fr) * 2010-02-16 2011-08-17 Koito Manufacturing Co., Ltd. Unité optique

Also Published As

Publication number Publication date
EP2863111B1 (fr) 2016-11-30
ITMI20131711A1 (it) 2015-04-16

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