Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
• • 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
• • 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
  • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
• • 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
  • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
• • 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
  • F21W2131/40—Lighting for industrial, commercial, recreational or military use
  • F21W2131/402—Lighting for industrial, commercial, recreational or military use for working places
• • 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 armature provided with a light source, which is disposed within a reflector having an elongated shape, of which two boundary edges bound an elongated opening, whereby an elongated element of light-transmitting material, which closes the greater part of said opening, is disposed near said opening, and whereby a boundary surface of said elongated element that faces said light source extends substantially between said boundary edges of said opening.
• Lighting armatures of this kind which accommodate one or more light sources, usually in the form of TL-tubes, and which may be provided with a thin glass plate disposed at the level of the opening bounded by the boundary edges of the reflector, are generally known.
• the object of the invention is to obtain a lighting armature of the above kind, which makes it possible to achieve a satisfactory, even lighting.
• this objective can be accomplished in that further boundary surfaces extending in a direction away from the light source and towards each other join the longitudinal edges of the boundary surface facing the light source of the element of light-transmitting material.
• a lighting armature is furthermore known wherein an optical element having light-refracting properties is provided in the interior of the reflector and above cross lamellae present in the reflector. Said optical element functions to refract the light beams falling onto the optical element and to deflect at least part of said light beams in the direction of parts of the reflector positioned below said optical element, from where the light is subsequently beamed into the room.
• a particularly optimal util ization of the 1 ight emitted by the light source can be achieved when an elongated element having a V-shaped section, of which at least the side facing the light source is reflective, is disposed between the light source and the upper part of the reflector, in such a manner that the part of the elongated element extending in the longitudinal direction of the reflector that is located furthest away from the elongated opening of the reflector is made up of the top of said element, which top is positioned in the longitudinal central plane of the reflector, whilst slots are provided in wall parts of the elongated element extending from the top of said elongated element in a direction away from each other, whereby the slots provided in one wall part are staggered with respect to the slots provided in the other wall part, seen in the longitudinal direction of the elongated element.
• V-shaped should be given a broad interpretation, it is also meant to include constructions having a curved or a more or less U-shaped section.
• the invention will be explained in more detail hereafter with reference to embodiments of the construction according to the invention, which are diagrammatically illustrated in the accompanying Figures.
• Figure 1 is a diagrammatic, cross-sectional view of a part of a lighting armature according to the invention.
• Figure 2 shows several other possible embodiments of elements consisting of light-transmitting material in cross-sectional view.
• Figure 3 is a diagrammatic, perspective view of one end of another embodiment of a lighting armature according to the invention.
• Figure 4 is a cross-sectional view of the lighting armature of Figure 3.
• Figure 5 is a perspective view of a part of an elongated element having a V-shaped section.
• Figure 1 is a cross-sectional view of a part of a lighting armature provided with a reflector 1, which extends in the longitudinal direction of the armature, perpendicularly to the plane of the drawing, and which surrounds part of the circumference of a light source 2, usually a TL-tube.
• reflector 1 comprises a curved central part 3, which blends near its boundary edges into connecting parts 4 extending in a direction away from the light source, which connect central part 3 of the reflector to further curved reflector parts 5.
• said reflector parts 5 blend into connecting parts 6 likewise extending in a direction away from the light source 2, which connect reflector parts 5 to further curved reflector parts 7.
• the lower boundary edges 8 of said reflector parts 7 bound an opening, near which an element 9, which may or may not be concave, of light-transmitting material is disposed.
• the elongated element extending perpendicularly to the plane of the drawing has a triangular section and comprises a boundary surface 10 facing the light source, which lies at least substantially in one plane with the boundary edges 8 of reflector 1, and two boundary surfaces 11 and 12 extending in a direction away from the light source and towards each other, all this in such a manner that element 9 has a triangular cross-section.
• the reflector 1 is selected to have a configuration such that at least the greater part of the light falling onto the part of the reflector that is located on one side of the plane of symmetry S-S of the armature will fall onto a part of surface 10 that is located on the other side of said plane of symmetry S-S.
• the element 9 projecting under said reflector has the appearance of an element emitting evenly shining light, which, as has become apparent in practice, will result in a very even lighting of a comparatively large area with hardly any objectionable luminance, which is in particular important when lighting rooms in which people frequently work with display screens.
• the angle at which the light is emitted is determined by the light refraction effects of the light-transmitting element, and consequently is no longer dependent on the height and width of the armature, more in particular of the reflector.
• the boundary surface 10 may extend to near the boundary edges 8 of the reflector.
• slots 13 extending in the longitudinal direction of the armature are present between the ends of boundary surface 10 of element 9 and the boundary edges 8 of the reflector, in which slots decorative elements of a desired colour, which may or may not transmit light, may be disposed.
• the manner of light diffusion by means of elongated element 9 can be influenced not only by varying the top angle between the two boundary surfaces 11 and 12 and/or the refraction index of the material used for forming said element, but also by varying the configuration of the various boundary surfaces; several possible configuratons are shown in Figure 2.
• the boundary surface 10 facing the light source is slightly curved, whereby the centre of curvature of said curved surface is located on the side of surface 10 that faces away from the light source.
• Figure 2b likewise shows a curved configuration of the boundary surface 10 facing the light source, in this embodiment the centre of curvature of said curved boundary surface is located on the same side of boundary surface 10 as the light source.
• the boundary surface facing the light source is built up of two curved portions 10a and 10b, which are positioned symmetrically with respect to the plane through the intersection of boundary surfaces 11 and 12, which divides element 9 in two.
• the centres of curvature of said curved portions are thereby located on the side of element 9 that faces the light source.
• Figure 2d shows an embodiment wherein the surface facing the light source is likewise built up of two curved portions 10a' and 10b ' , whose centres of curvature are located on the side of said boundary surface that faces away from the light source, however.
• Figure 2e shows an embodiment corresponding with Figure 2d, wherein the boundary surfaces 10a ' and 10b ' exhibit a more pronounced curvature.
• Figures 2f-2i show various embodiments, wherein the boundary surface 10 facing the light source is toothed to a smaller or larger degree, in order to effect a stronger diffusion of the light beams in the interior of element 9.
• Figure 2j shows an embodiment wherein the boundary surface 10 facing the light source has a configuration similar to that of the embodiment shown in Figure 2b.
• the two boundary surfaces 11 and 12 are likewise curved and blend evenly together.
• armatures to be fitted in a ceiling
• armatures may also be used in different manners, for example as suspended lamps or as elongated "spotlights" for illuminating objects.
• the configuration of the reflector may be different from the embodiment that has been illustrated and described, partly depending on the light situation.
• said further embodiment comprises an elongated element 14 disposed between the upper side of light source 2 and the curved central portion 3 of reflector 1, which element extends in the longitudinal direction of reflector 1.
• Elongated element 14 has a U-shaped or a V-shaped section and is thereby disposed in such a manner that the top of said section lies in the longitudinal central plane S-S of reflector 1, whilst the two wall parts 15 and 16 of elongated element 14 extending in a direction away from each other extend from the top towards the light source and towards element 9 respectively.
• At least the side of elongated element 14 that faces light source 2 will be made of reflective material; preferably both sides will be reflective, however.
• elongated slots 17 and 18 are furthermore provided in wall parts 15 and 16 respectively, in such a manner that said slots extend perpendicularly to the longitudinal direction of the elongated element.
• the construction is thereby such that, seen in the longitudinal direction of elongated element 14, the slots 17 provided in wall part 15 are staggered with respect to slots 18 formed in wall part 16 of elongated element 14.
• a large part of the light emitted by light source 2 will fall onto the interior of reflector 1, as is indicated by light beam A, and be reflected from there to the boundary surface 10 of element 9 that faces the light source.
• Another part of the emitted light indicated by light beam B, will fall directly onto said plane 10.
• elongated element 14 By using elongated element 14 at least a large part of the light emitted from light source 2 in the direction of the central portion 3 of reflector 1 is received and reflected in such a manner that a very favourable utilization of the light emitted by the light source will be achieved.
• Light beams entering element 14 through slots 17 and 18 can be reflected, at least partially so, in the direction of the slots 13 positioned beside surface 10 of element 9, and illuminate decorative elements that may be present at that location, as is indicated by light beam E.
• the combination of the reflector 1 as described and illustrated with elongated element 14 is particularly efficient, it will be conceivable to use elongated element also in combination with reflectors having different sectional configurations. Furthermore it will be apparent that the lighting armature can be used not only for interior lighting but also for exterior 1 ighting.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)

Priority Applications (2)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26642381

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (5)

• 1997
  • 1997-04-23 WO PCT/NL1997/000210 patent/WO1997040313A1/nl not_active Application Discontinuation
  • 1997-04-23 EP EP97919731A patent/EP0895569A1/en not_active Withdrawn
  • 1997-04-23 AU AU24088/97A patent/AU2408897A/en not_active Abandoned

Patent Citations (5)

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