EP1376007A2 - Beleuchtungseinrichtung - Google Patents

Beleuchtungseinrichtung Download PDF

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Publication number
EP1376007A2
EP1376007A2 EP03014108A EP03014108A EP1376007A2 EP 1376007 A2 EP1376007 A2 EP 1376007A2 EP 03014108 A EP03014108 A EP 03014108A EP 03014108 A EP03014108 A EP 03014108A EP 1376007 A2 EP1376007 A2 EP 1376007A2
Authority
EP
European Patent Office
Prior art keywords
reflecting layer
source
light
plate
screen
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
EP03014108A
Other languages
English (en)
French (fr)
Other versions
EP1376007A3 (de
EP1376007B1 (de
Inventor
Roberto 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
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 Artemide SpA filed Critical Artemide SpA
Publication of EP1376007A2 publication Critical patent/EP1376007A2/de
Publication of EP1376007A3 publication Critical patent/EP1376007A3/de
Application granted granted Critical
Publication of EP1376007B1 publication Critical patent/EP1376007B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/37—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors characterised by their material, surface treatment or coatings
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • 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
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • 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
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
    • 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
    • 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
    • F21Y2113/00—Combination of light sources

Definitions

  • the present invention relates to a lighting device designed to constitute a highly attractive multifunction furnishing element.
  • Interior lighting devices which have a light source housed inside a casing closed by a diffusing screen made of appropriate material to diffuse the light into the environment.
  • the diffusing screen normally has a visible surface of a given colour and appearance when the light source is off, and which, when the light source is on, substantially maintains the same appearance, even though, obviously, illuminated by the light source.
  • a lighting device comprising at least one light source, and a screen facing the source, characterized in that said screen comprises a plate made of light-diffusing material, and a mirror-effect reflecting layer located on a surface of the plate on the opposite side to the source to define a visible surface of said screen.
  • the reflecting layer has the appearance of a mirror surface when said source is off, and is substantially transparent when said source is on.
  • the lighting device provides for entirely new aesthetic and functional effects, by assuming different appearances depending on whether the light source is on or off, and also combines the functions of a lamp with those of a mirror : when the source is off the visible outer surface of the screen defines a mirrorlike reflecting surface, whereas, when the source is on, the outer surface of the screen is transparent to the light emitted by the source and provides for illuminating the environment in which the device is installed.
  • the possibility of adjusting the brightness of the source also provides for gradually altering the appearance of the screen to obtain fading, semitransparency, partial reflection effects, etc.
  • the reflecting layer may advantageously be made using a so-called “sun-shield” or “sun-control” film used in the building industry, for automotive glazing, and in optics (for producing mirror lenses for sunglasses).
  • such films are defined by layers of polymer materials (typically polyester) incorporating a metallized layer (e.g. of vapourized aluminium) to produce a typically striking silvery appearance with a pronounced mirror effect, and are capable of reflecting up to 80% of incident solar energy (the typical value of reflected visible light being around 60%), and of absorbing practically all UV and IR radiation (typically, up to about 99% of UV radiation, and up to about 80% of IR radiation).
  • polymer materials typically polyester
  • a metallized layer e.g. of vapourized aluminium
  • Such films are characterized by a "semireflecting" effect : when a glazed element fitted with a film of this type is placed between two environments of different light intensity, the glazed element is transparent on the lower light intensity side, and is substantially mirrorlike on the higher light intensity side.
  • room glazing in normal daylight conditions, is fully transparent from the inside, but nontransparent with a mirror surface from the outside.
  • predominant interior lighting e.g. artificial light turned on in the room
  • the glazing is transparent from the outside.
  • Films of this sort have never been used in the lighting industry, and in particular in an application in accordance with the present invention.
  • using such films in lighting devices in accordance with the invention ensures - given the high UV and, above all, IR radiation absorption typical of these films - the emission of a cold light with substantially no "hot" infrared component (as stated, these films absorb up to 80% of IR radiation and up to 99% of UV radiation).
  • the semireflecting effect typical of sun-shield films may be achieved in other ways, e.g. by vacuum deposition of thin metallized films on a substrate of polymer material; which substrate may even be defined by the outer surface itself of the plate of light-diffusing material.
  • the optical effect of depositing these films on the plate is equivalent to applying a sun-shield film.
  • Number 1 in Figure 1 indicates as a whole a lighting device, in particular an interior lighting device, designed, in the purely non-limiting example shown, for wall mounting.
  • Device 1 comprises a casing 2 having a concave body 3 comprising an inner cavity 4 and a front opening 5.
  • a seat 6 is defined inside cavity 4 to house one or, as in the example shown, two light sources 7 defined, for example, by respective (known) linear fluorescent lamps side by side and parallel to each other. Sources 7 are housed inside seat 6 next to a back wall 8 of body 3, and are supported by respective (known) lamp-holders 9. For the sake of simplicity, the electric connections (known) connecting sources 7 to a power source are not shown.
  • Body 3 has a surface 10 defining seat 6 and facing and partly surrounding sources 7 to define a diffusing reflector 11 for diffusing the light emitted by sources 7.
  • surface 10 is substantially impervious to light, and is defined, for example, by an opaque white surface to retain the light emitted by sources 7 inside seat 6 and direct it towards opening 5.
  • a screen 15 is fixed to body 3 (in any known manner not described or illustrated for the sake of simplicity), faces sources 7, and is fitted to a peripheral edge 16 of body 3 bounding opening 5, so as to close opening 5.
  • screen 15 comprises a plate 17 made of light-diffusing material, and having an inner surface 18 facing seat 6 and, therefore, sources 7 in use, and an outer surface 19 facing the environment for lighting in use and therefore located on the opposite side to sources 7.
  • plate 17 is made of opal or translucid polymer material, e.g. polymethacrylate or similar material, having a degree of reflection (reflectance) of visible light preferably ranging between approximately 40% and 60%, and a degree of transmission (transmittance) of visible light ranging between approximately 60% and 40%.
  • opal or translucid polymer material e.g. polymethacrylate or similar material, having a degree of reflection (reflectance) of visible light preferably ranging between approximately 40% and 60%, and a degree of transmission (transmittance) of visible light ranging between approximately 60% and 40%.
  • Plate 17 is shaped to comprise a flat, e.g. rectangular, front wall 21 substantially parallel to back wall 8 of body 3; and two lateral walls 22 extending perpendicularly from respective lateral edges of front wall 21.
  • a mirror-effect reflecting layer 23 defining a visible surface 24 of screen 15 and, therefore, of device 1.
  • Reflecting layer 23 comprises two opposite faces, and is such that, when the faces are subjected to different light intensities, the face exposed to the higher light intensity has the appearance of a substantially mirrorlike reflecting surface, and the face exposed to the lower light intensity has the appearance of a substantially transparent surface.
  • Reflecting layer 23 (and hence the whole of screen 15 defined by plate 17 and reflecting layer 23) produces a mirror effect when sources 7 are turned off, whereas, when sources 7 are turned on, reflecting layer 23 (and screen 15 as a whole) is substantially transparent to the light emitted by sources 7.
  • reflecting layer 23 has a degree of reflection (reflectance) of visible light of over approximately 70%, and a degree of transmission (transmittance) of visible light of less than approximately 30%, and is capable of absorbing over 70% (preferably about 80%) of IR radiation, and over 90% (preferably about 99%) of UV radiation.
  • screen 15 as a whole has a degree of reflection of visible light of over approximately 50%, and a degree of transmission of visible light of approximately 20% or less.
  • screen 15 has a visible-light reflectance of around 60%, and visible-light transmittance of around 20%.
  • Reflecting layer 23 is defined by a metallized film 25 of polymer material, comprising two or more layers of polymer material (e.g. polyester) incorporating at least one metallized layer (e.g. vapourized aluminium).
  • Film 25 has a silvery appearance with a pronounced mirror effect.
  • film 25 may, for example, be of the so-called “sun-shield” or “sun-control” type used in the building and automotive industries.
  • ScotchtintTM films produced by 3M in particular RE20SIARL, RE15SIX or equivalents, may be used.
  • other films of similar characteristics in terms of light, and in particular visible light, reflectance and transmittance may also be used.
  • Film 25 defining reflecting layer 23 is applied to surface 19, for example, by gluing with an adhesive layer 26 of suitable (known) adhesive.
  • surface 19 of plate 17 to which reflecting layer 23 is applied is substantially smooth. In a variation, however, surface 19 is rough or otherwise not perfectly smooth.
  • film 25 is also perfectly smooth to produce a homogeneous mirror effect and, when sources 7 are turned on, a homogeneous lighting effect.
  • any surface irregularities due, for example, to roughness of surface 19 or unevenness of adhesive layer 26) produce different effects (glare, colour reflections, etc.), so that both the surface finish of surface 19 and the way in which the adhesive attaching film 25 is applied to surface 19 can be used to obtain special effects of the visible surface 24 of screen 15.
  • reflecting layer 23 may be defined by one or more metallized films applied directly to surface 19 (e.g. by a known vacuum deposition process) or to a substrate of polymer material in turn fixed to surface 19.
  • Device 1 also comprises a system 27 (known and therefore not described for the sake of simplicity) for adjusting the light intensity emitted by sources 7, and so obtaining further special lighting effects.
  • a system 27 (known and therefore not described for the sake of simplicity) for adjusting the light intensity emitted by sources 7, and so obtaining further special lighting effects.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
  • Laminated Bodies (AREA)
EP03014108A 2002-06-25 2003-06-23 Beleuchtungseinrichtung Expired - Lifetime EP1376007B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20021393 2002-06-25
IT2002MI001393A ITMI20021393A1 (it) 2002-06-25 2002-06-25 Dispositivo di illuminazione

Publications (3)

Publication Number Publication Date
EP1376007A2 true EP1376007A2 (de) 2004-01-02
EP1376007A3 EP1376007A3 (de) 2004-05-19
EP1376007B1 EP1376007B1 (de) 2006-11-08

Family

ID=11450080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03014108A Expired - Lifetime EP1376007B1 (de) 2002-06-25 2003-06-23 Beleuchtungseinrichtung

Country Status (4)

Country Link
EP (1) EP1376007B1 (de)
DE (1) DE60309538T2 (de)
ES (1) ES2276999T3 (de)
IT (1) ITMI20021393A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964194A (en) * 1975-01-22 1976-06-22 Gugeler William G Changeable color display device
US4041302A (en) * 1976-07-06 1977-08-09 General Motors Corporation Dual color taillamp
GB2108256B (en) * 1981-10-09 1985-09-11 Wipac Dev Limited Vehicle lamp
FR2576249A1 (fr) * 1985-01-21 1986-07-25 Mora Michel Paroi translucide a couche de bois
US6497946B1 (en) * 1997-10-24 2002-12-24 3M Innovative Properties Company Diffuse reflective articles
FR2814531B1 (fr) * 2000-09-25 2002-12-06 Valeo Vision Dispositif d'eclairage ou de signalisation pour vehicule automobile d'aspect ameliore

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
ES2276999T3 (es) 2007-07-01
EP1376007A3 (de) 2004-05-19
DE60309538T2 (de) 2007-10-04
EP1376007B1 (de) 2006-11-08
DE60309538D1 (de) 2006-12-21
ITMI20021393A1 (it) 2003-12-29
ITMI20021393A0 (it) 2002-06-25

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