EP0833100A2 - Luminaire - Google Patents

Luminaire Download PDF

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Publication number
EP0833100A2
EP0833100A2 EP97202136A EP97202136A EP0833100A2 EP 0833100 A2 EP0833100 A2 EP 0833100A2 EP 97202136 A EP97202136 A EP 97202136A EP 97202136 A EP97202136 A EP 97202136A EP 0833100 A2 EP0833100 A2 EP 0833100A2
Authority
EP
European Patent Office
Prior art keywords
reflector
luminaire
housing
lamp
window
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
EP97202136A
Other languages
German (de)
French (fr)
Other versions
EP0833100A3 (en
EP0833100B1 (en
Inventor
Maria Elisabeth De Kruiff
Petrus Adrianus Josephus Holten
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
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP97202136A priority Critical patent/EP0833100B1/en
Publication of EP0833100A2 publication Critical patent/EP0833100A2/en
Publication of EP0833100A3 publication Critical patent/EP0833100A3/en
Application granted granted Critical
Publication of EP0833100B1 publication Critical patent/EP0833100B1/en
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
    • 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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures
    • 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 luminaire comprising:
  • Such a luminaire is known from JP-A-800 76 22.
  • the known luminaire is designed for illuminating a wall.
  • the auxiliary reflector here serves to illuminate also portions of the wall which are comparatively high and which would otherwise not be illuminated.
  • this object is achieved in that a second, concave, substantially symmetrical reflector with a light window substantially in the plane P is present in the housing next to the asymmetrical reflector, and in that second means for accommodating a tubular electric lamp are present.
  • the light formed into a beam by the second reflector is added to the light illuminating the wall from some distance away from the ceiling up to a large distance therefrom, so that the wall is illuminated more evenly and with a higher brightness.
  • An attractive feature of the luminaire is that objects which are positioned at a comparatively small distance opposite the illuminated wall also have their sides facing this wall illuminated by the luminaire, whereas these sides would otherwise be dark.
  • the luminaire comprises several parallel slats in the light window which extend in the second reflector, transversely thereto.
  • This embodiment has the advantage that the luminaire is incapable, at a comparatively small distance from the wall already, of radiating light in the longitudinal direction of the lamp at small angles to the ceiling, which could cause glare.
  • Such slats are not necessary for a lamp in the asymmetrical reflector because the reflector itself together with the auxiliary reflector screens off the lamp from locations centrally below the luminaire.
  • the housing comprises a recess with an opening in the plane P, in which recess a power rail is arranged.
  • the luminaire then offers the possibility of accommodating light sources for the creation of accent lighting through the connection of holders or luminaires for, for example, incandescent lamps, for example reflector lamps.
  • the luminaire may be fastened to or against a ceiling. It is also possible to incorporate the luminaire in a false ceiling.
  • the electric lamp may be, for example, a fluorescent lamp, for example a straight, double-ended lamp, or a single-ended lamp with mutually parallel tube portions.
  • the asymmetrical reflector may be formed by one or several parts.
  • the auxiliary reflector may or may not be integral therewith.
  • the auxiliary reflector may also be adjustable.
  • the symmetrical reflector may also comprise one or several parts, for example two parts which, positioned opposite one another, each extend laterally of an accommodated lamp. It is also possible for a portion of the housing to have a reflecting function.
  • the reflectors may be given a metal finish, of high, medium, or low specularity. Alternatively, they may have a painted reflecting surface.
  • the luminaire may be used on its own, in a row with similar luminaires, or alternatively in a continuous line illumination.
  • the luminaire in Fig. 1 has a housing 1 with a light emission window 2 in a plane P and a concave, asymmetrical reflector 3 in the housing.
  • Means 4 for accommodating a tubular electric lamp, a linear fluorescent lamp in the Figure, alongside the light emission window 2 are present in the housing.
  • An auxiliary reflector 5 projects through the light emission window 2 to the exterior and is arranged opposite the means 4 for accommodating the lamp.
  • the reflector 3 and the auxiliary reflector 5 already screen off the lamp to the extent that it is not visible from locations centrally below the luminaire.
  • a second, concave, substantially symmetrical reflector 6 with a light window 7 substantially in plane P is present in the housing 1.
  • the housing in addition has second means 8 for accommodating a tubular electric lamp, again a linear fluorescent lamp in the Figure, for the second reflector 6.
  • the reflectors are made of aluminum with a semi-specular finish.
  • the housing is painted and has a reflecting function for the lamp which is to be accommodated in the second means 8.
  • the second reflector 6 is formed by two parts in the Figure. These parts are positioned so as to face one another, on either side of a lamp to be accommodated.
  • slats 9 are present in the light window 7, extending in the second reflector and transversely thereto and situated in front of and behind the slat drawn in the Figure.
  • the slats 9 have an interspacing of approximately 3 cm in the Figure. They are substantially V-shaped in cross-section with a concave, for example parabolic outer surface 9a. Parallel lines in the slats indicate this curvature.
  • the slats 9 have substantially parallel surfaces 9b remote from the light window 7.
  • the housing 1 has a recess 10 with an opening in the plane P defined by the light emission window 7, in which recess a power rail 11 is accommodated.
  • Fig. 2 shows the illuminance on a wall as a function of the distance d to a ceiling in which a luminaire is accommodated.
  • the Figure shows the illuminance (curve a ) obtained with a conventional luminaire having only the asymmetrical reflector of Fig. 1 and a 35 W fluorescent lamp of approximately 15 mm diameter.
  • Curve a/s indicates the illuminance achieved with the luminaire according to the invention which contains two such fluorescent lamps.
  • the lamp in the symmetrical reflector adds substantially no illuminance to the uppermost 30 cm of the wall. A substantial increase in the illuminance is not obtained until approximately one meter down from the ceiling, and the illuminance is more than doubled at a great distance from the ceiling. It can be derived from the curves that the lamp in the symmetrical reflector evenly illuminates also a vertical plane facing the wall and positioned at a comparatively low level.

Abstract

The luminaire has a housing (1) in which a first asymmetric reflector (3) and a second symmetric reflector (6) are disposed. The reflectors (3,6) have a light emission window (2) resp. a light window (7) in a plane P. The first reflector (3) has an auxiliary reflector (5) opposite means (4) for holding a tubular lamp, which extends through the light emission window (2). The luminaire is able to illuminate a wall evenly from the ceiling to which or in which it is mounted.

Description

The invention relates to a luminaire comprising:
  • a housing with a light emission window in a plane P;
  • a concave asymmetrical reflector in the housing;
  • means in the housing for accommodating a tubular electric lamp alongside the light emission window; and
  • an auxiliary reflector which projects through the light emission window to the exterior and which is positioned opposite the means for accommodating the lamp.
    • Such a luminaire is known from JP-A-800 76 22.
    The known luminaire is designed for illuminating a wall. The auxiliary reflector here serves to illuminate also portions of the wall which are comparatively high and which would otherwise not be illuminated.
    It is a disadvantage of the luminaire, however, that low portions of a wall are comparatively dark, especially when the luminaire is used in a comparatively high space such as, for example, a shop or showroom.
    It is an object of the invention to provide a luminaire of the kind described in the opening paragraph with which a wall can be illuminated comparatively brightly with a high degree of homogeneity over its full height.
    According to the invention, this object is achieved in that a second, concave, substantially symmetrical reflector with a light window substantially in the plane P is present in the housing next to the asymmetrical reflector, and in that second means for accommodating a tubular electric lamp are present.
    The light formed into a beam by the second reflector is added to the light illuminating the wall from some distance away from the ceiling up to a large distance therefrom, so that the wall is illuminated more evenly and with a higher brightness. An attractive feature of the luminaire is that objects which are positioned at a comparatively small distance opposite the illuminated wall also have their sides facing this wall illuminated by the luminaire, whereas these sides would otherwise be dark.
    In a favorable embodiment, the luminaire comprises several parallel slats in the light window which extend in the second reflector, transversely thereto. This embodiment has the advantage that the luminaire is incapable, at a comparatively small distance from the wall already, of radiating light in the longitudinal direction of the lamp at small angles to the ceiling, which could cause glare. Such slats are not necessary for a lamp in the asymmetrical reflector because the reflector itself together with the auxiliary reflector screens off the lamp from locations centrally below the luminaire.
    It is favorable when the housing comprises a recess with an opening in the plane P, in which recess a power rail is arranged. The luminaire then offers the possibility of accommodating light sources for the creation of accent lighting through the connection of holders or luminaires for, for example, incandescent lamps, for example reflector lamps. The luminaire may be fastened to or against a ceiling. It is also possible to incorporate the luminaire in a false ceiling.
    The electric lamp may be, for example, a fluorescent lamp, for example a straight, double-ended lamp, or a single-ended lamp with mutually parallel tube portions.
    The asymmetrical reflector may be formed by one or several parts. The auxiliary reflector may or may not be integral therewith. The auxiliary reflector may also be adjustable. The symmetrical reflector may also comprise one or several parts, for example two parts which, positioned opposite one another, each extend laterally of an accommodated lamp. It is also possible for a portion of the housing to have a reflecting function. The reflectors may be given a metal finish, of high, medium, or low specularity. Alternatively, they may have a painted reflecting surface.
    The luminaire may be used on its own, in a row with similar luminaires, or alternatively in a continuous line illumination.
    An embodiment of the luminaire according to the invention is shown in the drawing, in which
  • Fig. 1 is a cross-section through the luminaire; and
  • Fig. 2 is a graph showing illumination diagrams.
    • The luminaire in Fig. 1 has a housing 1 with a light emission window 2 in a plane P and a concave, asymmetrical reflector 3 in the housing. Means 4 for accommodating a tubular electric lamp, a linear fluorescent lamp in the Figure, alongside the light emission window 2 are present in the housing. An auxiliary reflector 5 projects through the light emission window 2 to the exterior and is arranged opposite the means 4 for accommodating the lamp. The reflector 3 and the auxiliary reflector 5 already screen off the lamp to the extent that it is not visible from locations centrally below the luminaire.
    Next to the asymmetrical reflector 3, a second, concave, substantially symmetrical reflector 6 with a light window 7 substantially in plane P is present in the housing 1. The housing in addition has second means 8 for accommodating a tubular electric lamp, again a linear fluorescent lamp in the Figure, for the second reflector 6. The reflectors are made of aluminum with a semi-specular finish. The housing is painted and has a reflecting function for the lamp which is to be accommodated in the second means 8. The second reflector 6 is formed by two parts in the Figure. These parts are positioned so as to face one another, on either side of a lamp to be accommodated.
    Several parallel slats 9 are present in the light window 7, extending in the second reflector and transversely thereto and situated in front of and behind the slat drawn in the Figure. The slats 9 have an interspacing of approximately 3 cm in the Figure. They are substantially V-shaped in cross-section with a concave, for example parabolic outer surface 9a. Parallel lines in the slats indicate this curvature. The slats 9 have substantially parallel surfaces 9b remote from the light window 7.
    The housing 1 has a recess 10 with an opening in the plane P defined by the light emission window 7, in which recess a power rail 11 is accommodated.
    Fig. 2 shows the illuminance on a wall as a function of the distance d to a ceiling in which a luminaire is accommodated. The Figure shows the illuminance (curve a) obtained with a conventional luminaire having only the asymmetrical reflector of Fig. 1 and a 35 W fluorescent lamp of approximately 15 mm diameter. Curve a/s indicates the illuminance achieved with the luminaire according to the invention which contains two such fluorescent lamps.
    It is evident from Fig. 2 that the lamp in the symmetrical reflector adds substantially no illuminance to the uppermost 30 cm of the wall. A substantial increase in the illuminance is not obtained until approximately one meter down from the ceiling, and the illuminance is more than doubled at a great distance from the ceiling. It can be derived from the curves that the lamp in the symmetrical reflector evenly illuminates also a vertical plane facing the wall and positioned at a comparatively low level.

    Claims (3)

    1. A luminaire comprising:
      a housing (1) with a light emission window (2) in a plane P;
      a concave asymmetrical reflector (3) in the housing;
      means (4) in the housing for accommodating a tubular electric lamp alongside the light emission window (2); and
      an auxiliary reflector (5) which projects through the light emission window (2) to the exterior and which is positioned opposite the means (4) for accommodating the lamp, characterized in that a second, concave, substantially symmetrical reflector (6) with a light window (7) substantially in the plane P is present in the housing (1) next to the asymmetrical reflector (3), and in that second means (8) for accommodating a tubular electric lamp are present.
    2. A luminaire as claimed in Claim 1, characterized in that several parallel slats (9) extending transversely to the second reflector (6) are present in the light window (7).
    3. A luminaire as claimed in Claim 1 or 2, characterized in that the housing (1) comprises a recess (10) with an opening in the plane P, in which recess a power rail (11) is arranged.
    EP97202136A 1996-09-30 1997-07-11 Luminaire Expired - Lifetime EP0833100B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    EP97202136A EP0833100B1 (en) 1996-09-30 1997-07-11 Luminaire

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    EP96202716 1996-09-30
    EP96202716 1996-09-30
    EP97202136A EP0833100B1 (en) 1996-09-30 1997-07-11 Luminaire

    Publications (3)

    Publication Number Publication Date
    EP0833100A2 true EP0833100A2 (en) 1998-04-01
    EP0833100A3 EP0833100A3 (en) 2000-01-26
    EP0833100B1 EP0833100B1 (en) 2001-11-14

    Family

    ID=26143207

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97202136A Expired - Lifetime EP0833100B1 (en) 1996-09-30 1997-07-11 Luminaire

    Country Status (1)

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    EP (1) EP0833100B1 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    AU2004201558B2 (en) * 2003-07-22 2006-03-02 Acuity Brands, Inc. Improved luminaires for illumination of outdoor panels

    Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JPH087622A (en) 1994-06-22 1996-01-12 Matsushita Electric Works Ltd Wall surface luminaire

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4349866A (en) * 1980-05-27 1982-09-14 General Signal Corporation Light reflection system with asymmetric reflector assembly
    GB8311075D0 (en) * 1983-04-22 1983-05-25 Hall S M Light fitting for wall illumination
    US4564888A (en) * 1984-11-28 1986-01-14 Linear Lighting Corp. Wall-wash lighting fixture
    US5146393A (en) * 1991-03-06 1992-09-08 Genlyte, Inc. Fluorescent fixture with wall wash feature
    DE9115705U1 (en) * 1991-12-18 1992-02-13 Dipl.-Ing. Schaer-Luederitz Gmbh, 4990 Luebbecke, De

    Patent Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JPH087622A (en) 1994-06-22 1996-01-12 Matsushita Electric Works Ltd Wall surface luminaire

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    AU2004201558B2 (en) * 2003-07-22 2006-03-02 Acuity Brands, Inc. Improved luminaires for illumination of outdoor panels

    Also Published As

    Publication number Publication date
    EP0833100A3 (en) 2000-01-26
    EP0833100B1 (en) 2001-11-14

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