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WO2005071308A1 - Dispositif d'eclairage servant a eclairer une surface - Google Patents

Dispositif d'eclairage servant a eclairer une surface Download PDF

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Publication number
WO2005071308A1
WO2005071308A1 PCT/DK2005/000012 DK2005000012W WO2005071308A1 WO 2005071308 A1 WO2005071308 A1 WO 2005071308A1 DK 2005000012 W DK2005000012 W DK 2005000012W WO 2005071308 A1 WO2005071308 A1 WO 2005071308A1
Authority
WO
WIPO (PCT)
Prior art keywords
lighting device
light
light source
illumination
lamellae
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.)
Ceased
Application number
PCT/DK2005/000012
Other languages
English (en)
Inventor
Steen Arent Møller ANDERSEN
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.)
ZARP DANMARK APS
Original Assignee
ZARP DANMARK APS
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 ZARP DANMARK APS filed Critical ZARP DANMARK APS
Priority to EP05700562A priority Critical patent/EP1706664A1/fr
Publication of WO2005071308A1 publication Critical patent/WO2005071308A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
    • F21V33/0004—Personal or domestic articles
    • F21V33/0012—Furniture
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B97/00—Furniture or accessories for furniture, not provided for in other groups of this subclass
    • 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
    • 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
    • F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type
    • 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
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/10—Combinations of only two kinds of elements the elements being reflectors and screens
    • 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

Definitions

  • the invention relates to a lighting device for illumination of a surface, comprising a light source, a screening device adapted for screening off part of the light radiating from the light source, and an opening in the lighting device, through which the light is allowed to radiate, where the light allowed to radiate through an area of the opening, measured perpendicularly to a normal of the surface of the light source, forms a VBA of less than approximately 30° .
  • illumination surface in the following, such as the spines of books on shelves in a library or on other surfaces required to be emphasized, it is often a requirement for the light from the light source to be screened off in the directions away from the illumination surface.
  • the VBA Vehicle Beam Angle
  • the VBA is defined as the angle in which the light is spread from the luminary, i.e. the angle in which the light becomes visible.
  • the purpose of this angle being relatively small is, first of all, to avoid blinding people who are, for example, looking at or passing by the illumination surface; secondly, it may be important for architectural or aesthetic reasons that other surfaces and objects nearby are not illuminated unintentionally.
  • light sources may be categorized as either punctiform or diffuse, where light from punc- tiform light sources, such as halogen lamps, radiates approximately from a single point in all directions, and light from diffuse light sources, such as fluorescent tubes, radiates from many points on the surface of the light source in all directions.
  • punc- tiform light sources such as halogen lamps
  • diffuse light sources such as fluorescent tubes
  • the VBA of the entire lighting device it is possible for the VBA of the entire lighting device to be within the same range. It is thus possible to achieve a special illumination of exactly the required part of the illumination surface. This is possible because the light from punctiform light sources can be easily and efficiently screened off and reflected in a very narrow and distinctly defined direction by means of a reflecting screening device, for example parabolic in shape; and this screening device may be further supplemented by a system of lenses. Examples of such lighting devices are marketed by Erco under the name wallwashers .
  • punctiform light sources are normally placed on the ceiling, in a row with little mutual distances.
  • the illumination area from a punctiform light source on a plane surface is elliptical, and the light from the light sources each illuminate a small area of the illumination surface. If the lighting device radiates perpendicularly on to a surface, the illuminated area will be circular, and the light intensity at the centre will be significantly greater than the light intensity at the edges. Normally, the lighting devices will therefore overlap and supple- ment each other, in the outer parts of the illumination areas of the respective light sources. This solution gives a more uniform surface illumination, both in the transverse and the longitudinal directions of the row of light sources.
  • a lighting device comprising a light source panel.
  • the panel comprises two fluorescent tubes, which from either end of two transparent plates with facing surfaces radiate into these.
  • a film placed on the outside of each plate is illuminated.
  • a further film is placed between the plates and on the outside of these.
  • reflecting sections are furthermore provided to achieve a uniform illumination of the films. It is a purpose of the present invention to provide a lighting device of the kind mentioned in the introduction, where the lighting device, when used for surface illumination, can provide a more regular and uniform illumination and a greater efficiency than the known lighting devices. A further purpose is to enable the lighting device to be given smaller dimensions, and for the heat emission to be reduced, compared with the known lighting devices.
  • the lighting device of the invention is characterized in that the light source is diffuse, and in that said area of the opening is constituted by a lamella device comprising at least two light absorbing and/or reflecting lamellae, so that light allowed to radiate between the lamellae, in total, forms a maximum of said VBA, the VBA preferably being less than approximately 17°.
  • an illumination of the entire illumination surface is achieved, which illumination, to a person looking at it, will appear to be completely regular and uniform, both in the longitudinal and the transverse directions of the light source.
  • the reason for this is that it is possible to achieve a maximum difference in achieved illumination intensity over the entire illumination surface as small as 1:2, or even smaller.
  • said "bumpy" illumination areas from the punctiform light sources are avoided completely.
  • the lamella device of the invention it is possible to provide the above- mentioned advantages entirely without blinding people, and the light source is completely concealed from people looking at or passing by the illumination surface.
  • VBA of less than 30° for the lamella device, it is possible to provide a lighting device, which is efficient and, at same time, screens off the undesired light beams in the directions away from the surface. This, however, under the provision that the remaining part of the opening is arranged so that little or no light radiates from here in the directions away from the illumination surface.
  • the efficiency of the lighting device is high because a large part of the diffuse light is used for illuminating the illumination surface. Without the lamella device, the screening device would have to be so large, in order to achieve the above-mentioned advantages, that the efficiency of the lighting device would be so low that, in practice, it would not be a possibility. In stead, an ordinary halogen spot would, for example, be chosen. In comparison with the known rows of punctiform light sources, the efficiency can be increased significantly, and the heat emission can be correspondingly reduced.
  • a further advantage of the lighting device of the invention is that it can be given smaller dimen- sions, and that it can be placed closer to the illumination surface, while illuminating the entire illumination surface uniformly and intensity-efficiently.
  • the light source is oblong, and the lamellae are substantially parallel and extend substantially in the direction of the longitudinal axis of the light source, the light source furthermore preferably being linear, and the light source more preferably being a fluorescent tube.
  • the lamella device comprises a number of transparent layers comprising a substantially homogeneous, firm and transparent carrier material, and the lamellae are provided as light absorbing and/or reflecting film placed between the layers.
  • the lamellae may comprise a stretched elastic material, whereby the transparent carrier material between the lamellae may be omitted.
  • the mutual distance between the lamellae is no more than approximately 3.0 mm, the distance preferably being approximately 1.26 mm.
  • the lamella thickness is preferably less than approximately 0.5 mm, the thickness preferably being less than approximately 0.3 mm, and the thickness most preferably being less than or equal to 0.1 mm.
  • the layer width is preferably at least three times their mutual distance, more preferably at least five times their mutual distance and most preferably approximately eight times their mutual distance.
  • the screening device on its side facing the light source, is provided with a reflection device reflecting part of the light radia- ting from the light source through a part of the opening, which is not covered by the lamella device.
  • This reflecting light can then be used, for example, for illuminating a part of the illumination surface close to the lighting device.
  • the lighting device is substantially symmetrical, enabling two illumination surfaces placed on either side of the lighting device to be illuminated.
  • the lighting device is mounted in a position in relation to the illumination surface so that the longitudinal centre line of the light source is located between 10 and 100 mm away from the illumination surface, measured perpendicularly to this.
  • At a distance from the lighting device measured in the plane of the illumination surface at least one further lighting device is provided, so that the lighting of one lighting device supplements the lighting of the other lighting device in an area of the illumination surface.
  • Figure 1 shows a sectional view in horizontal cross section, seen from above, of three lighting devices according to the invention mounted for illumination of a bookshelf
  • Figure 2 shows a Figure 1 detail of the centre lighting device in horizontal cross section
  • Figure 3 shows a detail of the Figure 2 lighting device showing the light source and lamella device
  • Figure 4 shows a coordinate system for visualizing the relation between the total light opening of the lamella device, in percentage, as a function of the distance between the lamellae for a lighting device according to Figure 1 to 3.
  • Figure 1 shows a sectional view in horizontal cross section of three lighting devices la, lc, lb according to the invention mounted on either side and in the centre, respectively, of a bookshelf.
  • Horizontal is defined in accordance with the lighting devices la, lb, lc being mounted at two vertical illumination surfaces 3, in the figure the surface which is formed by the spines of the books on the bookshelf.
  • the lighting devices la, lb, lc can be used for illumination of any other kind of illumination surface, besides a bookshelf.
  • a Figure 1 detail of the centre lighting device lb is shown in horizontal cross section.
  • the lighting device lb comprises a linear diffuse light source in the form of a fluorescent tube 2, which is placed vertically in the lighting device lb.
  • the lamella devices 4 are made from six transparent layers 5, extending vertically, in parallel to the longitudinal direction of the fluorescent tube 2.
  • the layers 5 consist of a homogeneous, firm and transparent carrier material such as glass or acrylic.
  • thin light absorbing and/or reflecting lamellae 6 are provided, which can be fastened to the layers 5 before these are assembled into the lamella device 4, for example by gluing, and/or the lamellae 6 may be kept in place in the lighting device lb by means of a suitable number of retaining plates 4a, for example having a thickness of approximately 1 mm.
  • the lamellae 6 may be provided by a material painted onto, or pigment silk screen printed onto, or a plastic foil glued onto a plate, which is then cut out, after which the cut-out pieces are placed on top of each other to form the layers 5.
  • Lamellae with very effi- cient (i.e. thin) dimensions can thus be produced with low costs.
  • the lamella material may be applied to one or both sides of the layers 5, depending on production method and required thickness of the lamellae 6.
  • the colour of the lamellae 6 is dead black, to absorb the light falling on them.
  • part of or all of the lamellae 6 may be reflecting or be of a different colour in order to, for example, also redirect part of the light radiating from the light source 2 in the directions away from the illumination surfaces 3 and towards the illumination surfaces 3.
  • the lamellae 6 are inclined in relation to the plane of the illumination surfaces 3, and the light from the fluorescent tube 2 is thus directed towards the point on the illumination surface 3 farthest away from a lighting device la, lb, lc.
  • FIG 3 shows a detail of the Figure 2 light source 2 and lamella device 4.
  • the lamellae 6 are arranged with such dimensions that the light allowed to radiate freely between the lamellae 6, in total, forms a VBA of less than approximately 30°, pre- ferably less than approximately 17°.
  • the VBA for the lamella device 4 is measured in a plane perpendicularly to the longitudinal direction of the lamellae 6, i.e. in a plane parallel to the plane of the drawing.
  • VBA of less than approximately 30°
  • required light beams are allowed to pass unobstructed through the layers 5, while undesirable beams are screened off by the lamellae 6.
  • the thickness of the lamellae 6 is preferably chosen so as to achieve a good balance between production costs of the lamella device 4 and the efficiency of the lighting device la, lb, lc.
  • a good balance for the VBA value is achieved with approximately 17°.
  • a screening plate 7 is placed in front of the fluorescent tube 2, in the direction towards the illumination surfaces 3, in the entire length of the fluorescent tube 2, . Its function is to prevent direct light from the fluorescent tube 2 from radiating along the inside of the lamella device 4, since a very large amount of direct light would otherwise radiate on to the area of the bookshelves near the lighting device lb and result in a more non-uniform light distribution across the illumination surfaces 3.
  • a screening device 8 is placed. This prevents light from the fluorescent tube 2 from radiating in a large angle of directions away from the illumination surfaces 3. However, the screening device 8 does not prevent any of the diffuse light from the fluorescent tube 2 directly towards the illumination surfaces 3 from falling on to these, since it, in all positions, is placed at a distance farther away from the illumination surfaces 3 than that of the tangential planes of the fluorescent tube 2, which are parallel to and farthest away from the illumination surfaces 3.
  • the screening device 8 On the side facing the fluorescent tube 2, the screening device 8 is provided with a reflection device in the form of a reflecting metal plate 8a.
  • the screening device 8 For the lighting devices la, lc placed at the sides of the bookshelf, it may be advantageous to expand the screening device 8 so as to also screen off the one of the two openings in the respective symmetrical lighting devices la, lc facing away from the illumination surfaces 3. Thus, undesirable light radiation in the lateral directions of the bookshelf is avoided.
  • This expansion of the screening device 8 may advantageously consist of a diffuse material.
  • the expansion will appear as a luminous plate, which, in the case of illumination of- a library shelf, for example, could be used as a decorative sign describing the content of the shelf in question. In other connections too, such a diffuse plate could present various decorative or functional functions.
  • the fluorescent tube 2 is placed in a socket 9, whereas the required electrical components (not shown) are placed in a compartment 10 located between the illumination surfaces 3 and the fluorescent tube 2.
  • the described arrangement of the individual parts in the lighting device la, lb, lc means that all light in the directions away from the illumi- nation surfaces 3 is screened off, while a very large part of the diffuse light from the fluorescent tube 2 is allowed to radiate through the lamella device 4, or the other parts of the two openings in the lighting device lb, and is thus used for an efficient and uniform illumination of the illumination surfaces 3.
  • Example Figure 4 shows a coordinate system for visuali- zing the relation between the total light opening of the lamella device, in percentage, as a function of the distance S between the lamellae 6 for the Figure 2 lighting device.
  • the curves a and b are calculated for an area of the distance S between 0.5 and 5 mm, based on an example of a lighting device lb in accordance with Figure 1 to 3. Screening off is required in all directions away from the illumination surfaces 3, and therefore the outer leg of the VBA is kept plane parallel to the illumination surfaces 3 by adjusting the angle change of the lamellae 6 in relation to the illumination surfaces 3.
  • the width of the illumination surfaces 3 is chosen to be 900 mm (corresponding to the width of a regular bookshelf) , and therefore the light opening in the lamella device 4 is chosen to be calculated from a point at half this distance, i.e. approximately 450 mm from the lighting device lb, under the assumption that another lighting device la, lc is illuminating the other half of the surface.
  • the distance from the centre of the fluorescent tube 2 to the illumination surfaces, in the trans- verse direction of these, is chosen to be 60 mm.
  • the width B of the lamellae 6 is set to be 10 mm, the surfaces of the lamellae 6 are non-reflecting and, for curve a, the thickness of the lamellae 6 is set to be 0.1 mm, whereas it is set at 0.3 mm for curve b.
  • the thickness of the lamellae 6 in curve a are achievable with a lamella device 4 having the lamellae silk screen printed onto either side of the layers 5, as described above, while the lamellae 6 for curve b are achievable in a corresponding way or, for example, by stretching the lamellae of an elastic material .
  • the lamella device 4 it is an object for the lamella device 4 to be so dimensioned that as large a part of the diffuse light from the fluorescent tube 2 as possible ra- diates through the lamella device 4, without, however, the production costs for the lamella device being too high.
  • the distance S between the lamellae 6 being chosen to be 1.26 mm.
  • the curves show that the thickness of the lamellae 6 has no impact on the optimum distance between the lamellae 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Le dispositif d'éclairage de l'invention (1a, 1b, 1c) comprend: une source lumineuse diffuse (2); un dispositif écran (8) qui occulte une partie de la lumière rayonnant de la source lumineuse (2); et une ouverture ménagée dans le dispositif d'éclairage (1a, 1b, 1c) et à travers laquelle la lumière peut rayonner. Le dispositif d'éclairage (1a, 1b, 1c) comprend en outre un dispositif lamellaire (4) présentant au moins deux lamelles d'absorption et/ou de réflexion de la lumière (6). La lumière qui rayonne à travers les lamelles (6) forme un VBA (angle du faisceau visuel) inférieur à environ 30°.
PCT/DK2005/000012 2004-01-23 2005-01-11 Dispositif d'eclairage servant a eclairer une surface Ceased WO2005071308A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05700562A EP1706664A1 (fr) 2004-01-23 2005-01-11 Dispositif d'eclairage servant a eclairer une surface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200400090 2004-01-23
DK200400090A DK200400090A (da) 2004-01-23 2004-01-23 Belysningsindretning til fladebelysning

Publications (1)

Publication Number Publication Date
WO2005071308A1 true WO2005071308A1 (fr) 2005-08-04

Family

ID=34802587

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2005/000012 Ceased WO2005071308A1 (fr) 2004-01-23 2005-01-11 Dispositif d'eclairage servant a eclairer une surface

Country Status (3)

Country Link
EP (1) EP1706664A1 (fr)
DK (1) DK200400090A (fr)
WO (1) WO2005071308A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1334217A (fr) * 1962-09-24 1963-08-02 Dow Chemical Co Feuilles de composition thermoplastique transparente qui diffusent la lumière
EP0355805A2 (fr) 1988-08-23 1990-02-28 Matsushita Electric Industrial Co., Ltd. Panneau lumineux
US5530628A (en) * 1993-04-05 1996-06-25 Peerless Lighting Corporation Task light
US5879070A (en) * 1995-06-07 1999-03-09 Anthony's Manufacturing Company, Inc. Louvered lighting system
FR2801091A1 (fr) * 1999-11-16 2001-05-18 Lec Dispositif d'eclairage comprenant au moins une diode electroluminescente
EP1143193A2 (fr) * 2000-04-07 2001-10-10 Glättli Hansheinrich Dispositif d' éclairage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1334217A (fr) * 1962-09-24 1963-08-02 Dow Chemical Co Feuilles de composition thermoplastique transparente qui diffusent la lumière
EP0355805A2 (fr) 1988-08-23 1990-02-28 Matsushita Electric Industrial Co., Ltd. Panneau lumineux
US5530628A (en) * 1993-04-05 1996-06-25 Peerless Lighting Corporation Task light
US5879070A (en) * 1995-06-07 1999-03-09 Anthony's Manufacturing Company, Inc. Louvered lighting system
FR2801091A1 (fr) * 1999-11-16 2001-05-18 Lec Dispositif d'eclairage comprenant au moins une diode electroluminescente
EP1143193A2 (fr) * 2000-04-07 2001-10-10 Glättli Hansheinrich Dispositif d' éclairage

Also Published As

Publication number Publication date
DK200400090A (da) 2005-07-24
EP1706664A1 (fr) 2006-10-04

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