EP0619454A1 - Leuchtenraster und Leuchte mit einem solchen Raster - Google Patents

Leuchtenraster und Leuchte mit einem solchen Raster Download PDF

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Publication number
EP0619454A1
EP0619454A1 EP94200863A EP94200863A EP0619454A1 EP 0619454 A1 EP0619454 A1 EP 0619454A1 EP 94200863 A EP94200863 A EP 94200863A EP 94200863 A EP94200863 A EP 94200863A EP 0619454 A1 EP0619454 A1 EP 0619454A1
Authority
EP
European Patent Office
Prior art keywords
reflector
louvre
lamellae
luminaire
axis
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
EP94200863A
Other languages
English (en)
French (fr)
Other versions
EP0619454B1 (de
Inventor
Jacques C/O Int. Octrooibureau B.V. Sergent
Olivier C/O Int. Octrooibureau B.V. Gaillot
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Priority to EP19940200863 priority Critical patent/EP0619454B1/de
Publication of EP0619454A1 publication Critical patent/EP0619454A1/de
Application granted granted Critical
Publication of EP0619454B1 publication Critical patent/EP0619454B1/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
    • 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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • 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
    • 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

Definitions

  • the invention relates to a louvre for use in the light emission window of a luminaire, comprising: an inner circumferential reflector having an axis and an inner surface concavely curved along this axis; an outer circumferential reflector having an outer surface concavely curved along the axis, which outer reflector is coupled to the inner reflector; lamellae fastened to the outer reflector and extending away from the axis.
  • the invention also relates to a luminaire provided with this louvre.
  • a luminaire provided with such a louvre is known from DE 38 26 676 A1.
  • the known luminaire is designed for compact fluorescent lamps.
  • the function of the louvre is to prevent the luminaire, mounted against or in a ceiling, from radiating light at great angles to the perpendicular and thus causing, for example, reflections on display screens and on work surfaces in the illuminated room.
  • the inner reflector of the known louvre is parabolically curved and has an outwardly projecting collar at both its ends.
  • the outer reflector is also parabolically curved and rests on one of these collars, while gripping behind the other collar with plate springs fastened to this reflector.
  • the lamellae are parabolically curved, V-shaped, in cross-section. They are fastened to the outer reflector with screws.
  • the construction of the known louvre has a number of disadvantages.
  • a large number of components is required for assembling the louvre. This is one of the reasons why the assembly requires comparatively much time and the manufacture of the louvre is logistically complicated.
  • the outwardly projecting collar on which the outer reflector rests intercepts light, which is thrown back sideways and thus is removed from the beam to be formed.
  • the other outwardly projecting collar, behind which the plate springs grip, causes reflections in the luminaire, whereby locally undesirable increased brightnesses arise on portions of the luminaire, which detract from the homogeneity of the beam to be formed and from the comfort offered by the illumination.
  • this object is achieved in that the outer reflector has a rim bent back upon itself on which the inner reflector rests with a shoulder thereof, and the two reflectors are kept in position relative to one another by the lamellae.
  • the lamellae may project through the outer reflector, for example with tags and a tongue at these lamellae, and be fastened thereto, for example, in that these tags are bent behind this reflector or in that they snap behind this reflector.
  • the tongue may extend through the inner reflector and thus prevent this reflector from working loose from its seat on the bent-back rim.
  • the lamellae may be flat strips, but in a favourable embodiment they are substantially V-shaped, having a bottom and legs.
  • the lamellae may be fastened to the outer reflector in various ways, for example, without additional components being used for this. In that case, openings are present in the outer reflector into which the lamellae are hooked. Such fastenings are known, for example, from rectangular louvre attachments for luminaires. In that application, transverse slats may be fastened to side reflectors or to longitudinal lamellae, or to longitudinal reflectors placed between the ends of the lamellae.
  • EP 0 491 428 A1 discloses inter alia a construction in which ears present at the lamellae project through openings in a reflector and are fixed therein by snap connections.
  • the lamellae each have a slot in the bottom of the V and at a distance therefrom tongues, while the outer reflector has openings.
  • the lamellae project into respective openings, have a boundary thereof enclosed in the slot, and project with their tongues through the opening with locking action.
  • the tongues are bent back, for example, behind the reflector.
  • the reflectors are each curved in accordance with a curve of a degree higher than two. It was found that a particularly good screening is obtained thereby, and the light beam is cut off already at comparatively small angles to the axis, so that the luminance above that angle is below 200 cd/m2.
  • the legs of the lamellae are concavely curved in accordance with the arc of a circle at their outer surface.
  • the convex sides of the reflectors light-absorbing, for example, a dull black. Furthermore, it is advantageous also to give the mutually facing, for example convex sides of the legs of the lamellae such a finish. Parasitic radiation can then be avoided.
  • the lamellae have free-end portions with recesses, for example, opposite the bottom of the V in the case of substantially V-shaped lamellae.
  • the luminaire according to the invention has a concave circumferential main reflector with a light emission window and at a distance from that window means for accommodating at least one electric lamp.
  • the luminaire is provided with a louvre according to the invention.
  • the luminaire comprises a ring around the light emission window, and the louvre is accommodated with the free-end portions of the lamellae between the main reflector and the ring.
  • the luminaire has a concave circumferential main reflector 31 with a light emission window 32 and, at a distance from that window, means 33 for accommodating an electric lamp, in the Figure three lampholders of which two are visible, each suitable for accommodating, for example, a compact fluorescent lamp.
  • the luminaire has a louvre 1 in its light emission window 32.
  • the louvre 1 has an inner circumferential reflector 2 with an axis 3 and an inner surface 4 concavely curved along this axis.
  • An outer circumferential reflector 12 with an outer surface 14 concavely curved along the axis 3 is coupled to the inner reflector 2.
  • Lamellae 20 extending away from the axis 3 are fastened to the outer reflector 12.
  • the outer reflector 12 [Fig. 2 a] has a rim 15 which is bent back upon itself and on which the inner reflector 2 rests with a shoulder 5 thereof.
  • the two reflectors 2, 12 are kept in position relative to one another by the lamellae 20.
  • the inner reflector 2 is self-centring on the outer reflector 12 owing to a cylindrical portion 5' present at the former reflector.
  • the lamellae 20 project through the outer reflector 12 and bear on the shoulder 5 of the inner reflector 2. They could, if so desired, alternatively rest on the convex surface 9 of this reflector so as to centre this reflector.
  • Openings 16, into which the lamellae 20 are hooked, are present in the outer reflector 12 [Fig. 2].
  • the lamellae 20 [Fig. 2 b] are substantially V-shaped with a bottom 21 and legs 22. They each have a slot 23 [Fig. 2 d] in their bottom 21 in which a boundary of an opening 16 in the outer reflector 12 is accommodated, as well as tongues 24 which grip through this opening with locking action.
  • the tongues could be snapped into the reflector. In the embodiment shown, they lie in the opening with clamping fit.
  • One of the tongues 24 has already been bent back behind the reflector 12.
  • the opening 16 has narrowed portions 16' where the legs of the lamellae are accommodated with their free edges. These portions render it impossible for the tongues to lose their grip behind the reflector.
  • Fig. 2 a shows that none of the reflectors 2, 12 restricts the passage of light from the other reflector.
  • Table 1 y x reflector 2 x reflector 12 0 59 64 5 58,9 64,09 10 58,81 64,19 15 58,73 64,27 20 58,61 64,38 25 58,34 64,66 30 58,02 64,98 35 57,67 65,32 40 57,28 65,71 45 56,86 66,14 50 56,38 66,62 55 55,85 67,14 60 55,22 67,77 65 68,57
  • the reflectors 2, 12 are curved in accordance with a curve of a degree higher than 2, as shown in Table 1.
  • the legs 22 of the lamellae 20 are substantially circularly concavely curved at their outside 25.
  • the reflectors 2, 12 are light-absorbing at their convex sides 9, 19 [Fig. 2 a], as are the mutually facing sides 29 of the legs 22 of the lamellae 20.
  • the lamellae have free-end portions 26 with recesses.
  • a ring 34 is present around the light emission window 32, and the louvre 1 is accommodated with the free-end portions 26 of the lamellae 20 between the ring 34 and the main reflector 31.
  • the ring is fixed, for example, with a clamp or with a bayonet coupling.
  • FIG. 3 reference numerals are 100 higher than those in Figs. 1 and 2.
  • the legs 122 of the lamella contain openings 128 into which tongues 118, which project into the opening 116 of the outer reflector 112 in forward direction, grip with locking action.
  • FIG. 4 reference numerals are 200 higher than those in Figs. 1 and 2.
  • the lamella 220 has tags 224 which are snapped into an opening 216 in the outer reflector 212.
  • a tongue 215' is present at the edge 215 of this reflector, which tongue projects through the shoulder 205 of the inner reflector 202.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
EP19940200863 1993-04-07 1994-03-30 Leuchtenraster und Leuchte mit einem solchen Raster Expired - Lifetime EP0619454B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19940200863 EP0619454B1 (de) 1993-04-07 1994-03-30 Leuchtenraster und Leuchte mit einem solchen Raster

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP93201031 1993-04-07
EP93201031 1993-04-07
EP19940200863 EP0619454B1 (de) 1993-04-07 1994-03-30 Leuchtenraster und Leuchte mit einem solchen Raster

Publications (2)

Publication Number Publication Date
EP0619454A1 true EP0619454A1 (de) 1994-10-12
EP0619454B1 EP0619454B1 (de) 1997-06-18

Family

ID=26133740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940200863 Expired - Lifetime EP0619454B1 (de) 1993-04-07 1994-03-30 Leuchtenraster und Leuchte mit einem solchen Raster

Country Status (1)

Country Link
EP (1) EP0619454B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0684425A2 (de) * 1994-04-27 1995-11-29 WILA LEUCHTEN GmbH Leuchte mit mindestens einem Leuchtmittel
CN102434810A (zh) * 2011-12-23 2012-05-02 惠州雷士光电科技有限公司 灯盘

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3826676A1 (de) * 1987-08-13 1989-02-23 Wila Leuchten Gmbh Leuchte fuer kompakt-leuchtstofflampen
DE3740674A1 (de) * 1987-12-01 1989-06-15 Trilux Lenze Gmbh & Co Kg Leuchtenraster

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3826676A1 (de) * 1987-08-13 1989-02-23 Wila Leuchten Gmbh Leuchte fuer kompakt-leuchtstofflampen
DE3740674A1 (de) * 1987-12-01 1989-06-15 Trilux Lenze Gmbh & Co Kg Leuchtenraster

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0684425A2 (de) * 1994-04-27 1995-11-29 WILA LEUCHTEN GmbH Leuchte mit mindestens einem Leuchtmittel
EP0684425A3 (de) * 1994-04-27 1996-04-10 Wila Leuchten Gmbh Leuchte mit mindestens einem Leuchtmittel.
CN102434810A (zh) * 2011-12-23 2012-05-02 惠州雷士光电科技有限公司 灯盘

Also Published As

Publication number Publication date
EP0619454B1 (de) 1997-06-18

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