EP0564022B1 - A lighting fixture - Google Patents

A lighting fixture Download PDF

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Publication number
EP0564022B1
EP0564022B1 EP93200727A EP93200727A EP0564022B1 EP 0564022 B1 EP0564022 B1 EP 0564022B1 EP 93200727 A EP93200727 A EP 93200727A EP 93200727 A EP93200727 A EP 93200727A EP 0564022 B1 EP0564022 B1 EP 0564022B1
Authority
EP
European Patent Office
Prior art keywords
light source
pair
lighting fixture
view
lighting
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.)
Expired - Lifetime
Application number
EP93200727A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0564022A1 (en
Inventor
Simon Cornelis Van Putten
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0564022A1 publication Critical patent/EP0564022A1/en
Application granted granted Critical
Publication of EP0564022B1 publication Critical patent/EP0564022B1/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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • 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

Definitions

  • the invention relates to a lighting fixture comprising a box-shaped housing having a rectangular bottom plate and a first and a second pair of parallel side plates, said side plates being connected to the bottom plate and defining a rectangular lighting aperture, a lamp holder for an elongated light source secured to the inner side of a respective side plate of said first pair of side plates, and a pair of longitudinal lamellae provided parallel to said second pair of side plates, being spaced from said second pair of side plates, from each other and from the lighting aperture.
  • Such a lighting fixture is known from Dutch Patent Application 89 00 477.
  • the known lighting fixture includes transverse lamellae, which are provided between said pair of longitudinal lamellae, parallel to said first pair of side plates.
  • the advantages of the known lighting fixture are the high lighting efficiency, the absence of point luminance and a low brightness value.
  • a defect of the known lighting fixture is, however, that the light source remains visible.
  • the object of this invention is to overcome this defect, while retaining the advantages already attained or even achieving an improvement with respect thereto.
  • the invention provides a lighting fixture of the kind mentioned in the preamble, which is characterized in that at the upper side of said pair of longitudinal lamellae means are provided which bridge the distance between said second pair of longitudinal lamellae and which hide said light source from view.
  • the design parameters or adjusting possibilities include the mutual distance of the longitudinal lamellae and the distance from the bottom side of the longitudinal lamellae to the lighting aperture.
  • Grids of metal or plastic material, prismatic and opal plates, partially diffused acrylate plates and partially diffused plates, mirroring on one side, of glass or plastic material are used as the means hiding the light source from view.
  • An auxiliary means such as a flush-mounted halogen lamp, a loudspeaker, a fire or smoke detector, an infrared detector or a wall socket may be provided in the means hiding the light source from view itself or in an additional, similarly provided auxiliary plate of metal or plastic material.
  • the lighting fixture according to the invention is adapted for the use of electromagnetic as well as high frequency ballasts.
  • reference numeral 1 indicates a box-shaped housing of a lighting fixture according to the invention, which is diagrammatically illustrated in cross-section.
  • the box-shaped housing 1 has a rectangular bottom plate 2, a first pair of side plates extending parallel to each other and to the plane of the drawing, one of said side plates being indicated at 3, and a second pair of parallel side plates 4, 5, said four side plates being connected to the bottom plate 2 and defining a rectangular lighting aperture 6.
  • Reference numeral 7 indicates an elongated light source 7, which is provided in the lighting fixture at a possible location, which is shown by way of example.
  • Said light source 7 may be a fluorescent lamp, a conventional lamp or a more modern, compact one, in which case one or more lamp holders (not shown) will be secured to both side plates of the first pair, of which only side plate 3 is shown, for receiving one or more light sources 7 in one or more positions.
  • one lamp holder needs to be provided on one of the side plates of the first pair of side plates, for example side plate 3, when light sources 7 adapted for connection at one of their ends are used.
  • Reference numerals 8 and 9 indicate side reflectors, which are secured to the housing 1 with one of their ends, the bottom ends in this case.
  • Reference numeral 10 indicates a head mirror which, as shown, may be formed in such a manner that it is profiled in the centre, i.e. curved towards the light source(s) on both sides of the axial line, contiguous thereto.
  • the fixture bottom may also be depressed to form a head reflector.
  • Reference numerals 11 and 12 indicate two longitudinal lamellae, which are a continuation of the side reflectors 9 and 8 respectively.
  • the side reflectors 8 and 9 may extend as far as the lighting aperture 6, leaving out the longitudinal lamellae 11 and 12. If the longitudinal lamellae 11 and 12 are provided, then their configuration is in principle determined by that of the side reflectors 8 and 9, of which they are a continuation. Numerals 18 and 19 indicate two supplementary longitudinal lamellae, whose configurations may differ from the side reflectors 9 and 8 as well as from each other, their curvatures for example being different.
  • the lamellae 18 and 19 have a wedge-shaped section, however, whereby the sides facing away from each other extend vertically and whereby the sides facing each other lie at an angle to the vertical, said angle being smaller than 25° in one embodiment.
  • the reason for this is the following: If said angle is larger than 25°, double reflections will occur, thus reducing the efficiency of the fixture. If said angle is smaller than 25°, the luminous flux will flow along the supplementary longitudinal lamella, so that double reflections do not occur.
  • the supplementary longitudinal lamellae 18, 19 are thus provided parallel to the second pair of side plates 4, 5, being spaced from said second pair of side plates, from each other and from the lighting aperture 6. Setting aside the specific configuration of the supplementary longitudinal lamellae 18, 19, thus far the lighting fixture shown in the Figure is in principle of conventional design and for example corresponds with the fixture described and shown in the Dutch Patent Application referred to in the preamble.
  • the lighting fixture shown in the Figure is provided, at the upper side of the pair of supplementary longitudinal lamellae 18, 19, with means 20 bridging the distance between the pair of supplementary longitudinal lamellae 18, 19 and hiding the light source 7 from view, said means being an opal plate 20 in the illustrated embodiment, i.e. a plate which is non-translucent on one side and translucent on the other side.
  • the effect of the opal plate 20 is that the light source 7 is hidden from view and thus cannot be reflected, or at least less, in a display screen positioned under the lighting fixture. In other words, undesirably high luminance in display screen equipment is shielded.
  • supplementary longitudinal lamellae 18, 19 means may be provided, for example guide channels, for carrying the means 20 shielding the light source.
  • opal plate it is also possible to use a quadratic grid as the means 20 hiding the light source from view.
  • grids of metal or plastic material, prismatic and opal plates, partially diffused acrylate plates and partially diffused plates, mirroring on one side, of glass or plastic material may be used.
  • the term partially in this context refers to a centrally located longitudinal strip.
  • an acrylic plastic plate called a lens or a refractory grid, comprising a hexagonal series of semi-spherical refractory elements is used.
  • the optical pattern at the bottom side of the lens may consist of a plurality of convex surfaces having a constant radius, and at the upper side said optical pattern may consist of correspondingly concave surfaces.
  • prisms are furthermore used for reflecting incident light, whilst at that location a series of essentially curved triangles is provided, which are regularly distributed within the hexagonal series of prisms.
  • Such a lens is marketed by HolophaneR Europe Ltd. under the designation "Controlens 8224".
  • the light transmission factor of such a lens is about 92%, whereas that of parabolic transverse lamellae is 85% at most.
  • the fixture and lighting efficiency will therefore be higher than with the above-mentioned Dutch Patent Application, because the losses of luminous flux are smaller.
  • the brightness value is lower, since the lens is located higher in the fixture than the brightness determining bottom side of the transverse lamellae in the said Dutch Patent Application; with this lens in particular both in transverse and in longitudinal direction.
  • An auxiliary means such as a flush-mounted halogen lamp, a loudspeaker, a fire or smoke detector, an infrared detector or a wall socket etc. may be provided in the means hiding the light source from view or in an additional, similarly provided auxiliary plate of metal or plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vehicle Body Suspensions (AREA)
  • Polarising Elements (AREA)
  • Seal Device For Vehicle (AREA)
EP93200727A 1992-03-30 1993-03-12 A lighting fixture Expired - Lifetime EP0564022B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9200579 1992-03-30
NL9200579A NL9200579A (nl) 1992-03-30 1992-03-30 Verlichtingsarmatuur.

Publications (2)

Publication Number Publication Date
EP0564022A1 EP0564022A1 (en) 1993-10-06
EP0564022B1 true EP0564022B1 (en) 1996-12-18

Family

ID=19860627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200727A Expired - Lifetime EP0564022B1 (en) 1992-03-30 1993-03-12 A lighting fixture

Country Status (4)

Country Link
EP (1) EP0564022B1 (nl)
AT (1) ATE146582T1 (nl)
DE (1) DE69306632T2 (nl)
NL (1) NL9200579A (nl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU766833B2 (en) * 1998-08-31 2003-10-23 Energy Management Limited Improvements in light fittings

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2404165A1 (fr) * 1977-09-26 1979-04-20 Donskoff Andre Caisson lumineux
US4418378A (en) * 1981-03-05 1983-11-29 Plan Hold Corporation Light box
NL191857C (nl) * 1984-02-06 1996-09-03 Philips Electronics Nv Armatuur voor het op geringe afstand belichten van planten.
DE8513863U1 (de) * 1985-05-10 1990-11-08 Dr.-Ing. Willing GmbH, 8604 Scheßlitz Einzelarbeitsplatzleuchte
DE3600915A1 (de) * 1986-01-15 1987-07-16 Metro Sb Handels Ag Baar Lichtkanaldecke
NL8900477A (nl) * 1989-02-27 1990-09-17 Simon Cornelis Van Putten Verlichtingsarmatuur met ingekorte dwarslamellen.

Also Published As

Publication number Publication date
NL9200579A (nl) 1993-10-18
EP0564022A1 (en) 1993-10-06
ATE146582T1 (de) 1997-01-15
DE69306632T2 (de) 1997-07-17
DE69306632D1 (de) 1997-01-30

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