EP0378918A1 - Beleuchtungsvorrichtung - Google Patents

Beleuchtungsvorrichtung Download PDF

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Publication number
EP0378918A1
EP0378918A1 EP89313171A EP89313171A EP0378918A1 EP 0378918 A1 EP0378918 A1 EP 0378918A1 EP 89313171 A EP89313171 A EP 89313171A EP 89313171 A EP89313171 A EP 89313171A EP 0378918 A1 EP0378918 A1 EP 0378918A1
Authority
EP
European Patent Office
Prior art keywords
light
reflector
primary
fitting
light source
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
EP89313171A
Other languages
English (en)
French (fr)
Other versions
EP0378918B1 (de
Inventor
John Howard Davies
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.)
Fifth Generation Tech Manufacturing Ltd
Original Assignee
Fifth Generation Tech Manufacturing Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26294732&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0378918(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from GB888829228A external-priority patent/GB8829228D0/en
Priority claimed from GB898900202A external-priority patent/GB8900202D0/en
Application filed by Fifth Generation Tech Manufacturing Ltd filed Critical Fifth Generation Tech Manufacturing Ltd
Publication of EP0378918A1 publication Critical patent/EP0378918A1/de
Application granted granted Critical
Publication of EP0378918B1 publication Critical patent/EP0378918B1/de
Anticipated expiration legal-status Critical
Revoked 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting

Definitions

  • This invention relates to a light fitting particularly though not exclusively for industrial use, at any elevated location, e.g. to illuminate high bay racking, storage areas, warehousing, machinery etc.
  • Conventional fittings comprise a fluorescent tube with a reflective surface, which may be curved, at a spaced location above the tube to direct light downwardly.
  • the tube is normally exposed to direct view by an observer positioned beneath the fitting, e.g. at floor level, producing discomfort in the form of glare, or even disabling glare, whilst furthermore, tests have shown that there is an uneven distribution of light from top to bottom of say racking being illuminated by a fitting, with greater intensity towards the top of the racking.
  • a light fitting comprising a light source and reflector means characterised in that the reflector means comprises a concave or quasi concave, primary reflector located to one side of the light source and in spaced relationship therefrom and of such shape principally to reflect light towards the zone to be illuminated; and a convex or quasi convex, secondary reflector located to another side of the light source and also in spaced relationship therefrom and of such shape as principally to reflect light towards the primary reflector, with the secondary reflector impervious to visible light rays and of such dimensions as to mask, wholly or substantially, the light source from the view of an observer.
  • the primary reflector would be above the light source, whilst the secondary reflector would be below the light source, and the light source is obscured from the view of a lower observer by the secondary reflector, and consequently the observer is not subjected to glare, even when looking upwardly e. g. during the course of inserting or removing articles or pallets for instance, into or from the racking.
  • the principal purpose of the primary reflector is to direct light downwardly - and of course for any particular installation the fitting is located at such a height, and the primary reflector is of such shape as to illuminate the racking etc., involved in an optimum manner - the principal reflective purpose of the secondary reflector is to direct light upwardly onto the primary reflector, so that more light is directed into the racking etc., than with prior art proposals, as the primary reflector reflects not only light received directly from the light source but also light received indirectly via the secondary reflector into the racking etc., as light that would traditionally be directed towards the observer is now re­directed into the racking.
  • the above has considered the installation of a fitting in accordance with the invention at an elevated location, to direct light outwardly and downwardly. It will be appreciated however that some installations may demand the location of the same fitting at a lower level, e.g. floor level, to direct light upwardly and outwardly.
  • the primary and secondary reflectors would be located 180 ⁇ ° apart and the 180 ⁇ ° plane may be vertical (to distribute light either downwardly and outwardly, or upwardly and outwardly) or horizontal in the case of say an inspection fitting, or at some intermediate angle.
  • some installations may require asymmetrical distribution, in which case the primary and secondary reflectors would not be located at 180 ⁇ ° but would be at some other angle.
  • the light source is preferably one or more fluorescent tubes, although other light sources more appropriate to a particular installation may of course be used in a fitting in accordance with the invention. Consequently, if the fitting is provided with a single fluorescent tube, and as industry-­standard tubes have external diameters of approximately 26mm and 38mm, then the secondary reflector would need to have an overall transverse dimension exceeding 26mm and 38mm in order to mask such a tube effectively. Preferably, even with a single fluorescent tube, the secondary reflector would have an overall transverse direction substantially exceeding the tube diameter. For instance, the transverse dimension could be of the order of 20 ⁇ 0 ⁇ mm, so as to mask the tube effectively, even when an observer is not directly beneath, but to one side of, the fitting.
  • the masking dimensions of the secondary reflector need to be suitably increased.
  • longitudinal dimensions with a fluorescent tube of industry-­standard length e.g. 2.5m (8ft), 1.8m (6ft), 1.5m (5ft) or 1.2m (4ft), the secondary reflector would need to correspond to this length, whilst the fitting would also need to approximate to this length.
  • the concavity of the primary reflector and convexity of the secondary reflector may be produced by rolling e.g., an aluminium alloy sheet or stainless steel sheet, to a true geometric curve e.g., a parabola, or the overall concave and convex shapes of the primary and secondary reflector respectively are produced by a multi-faceted construction, as manufacturing methods require.
  • the reflectors may be of such material thickness and/or construction that they are self-supporting over e.g. a 2m length, and consequently are mountable at their ends to support means.
  • the reflectors may be supported from a sheet metal casing or support structure, or by clips directly or indirectly to the tube itself. Both the primary and secondary reflectors conveniently have a silvered reflective surface.
  • the fitting 1 comprises a light source 6 in the form of a fluorescent tube, with a concave primary reflector 7 located above the light source 6, while a convex secondary reflector 8 is located beneath the light source 6, and is impervious to visible light rays. Furthermore, the secondary reflector 8 is of such lateral dimension 9 that the secondary reflector 8 masks the light source 6, wholly or substantially, from the view of an observer 10 ⁇ anywhere in the bay 3.
  • the spacing between the reflectors 7, 8 and the light source 6 and the curvature of the reflectors is such that the primary reflector 7 is adapted principally to reflect light rays 11 from its silvered reflective surface 12 into an area 13 of the racking to be illuminated, while the secondary reflector 8 is adapted principally to reflect light rays 14 from its silvered reflective surface 15 towards the primary reflector 7, and additionally, but to a lesser extent, to reflect light rays 15 into another area 13 of the racking requiring illumination.
  • the primary and secondary reflectors 7, 8 could be produced by rolling aluminium sheet, or stainless steel sheet to a truly geometrical curve
  • the primary and secondary reflectors 7, 8 are preferably of a multi-faceted construction i.e. their "curvature” is built up from a plurality of flat strips or facets in which case the aluminium sheet is provided with a plurality of "bend" lines at the junction between adjacent edges of adjacent facets.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP19890313171 1988-12-15 1989-12-15 Beleuchtungsvorrichtung Revoked EP0378918B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB888829228A GB8829228D0 (en) 1988-12-15 1988-12-15 Light fitting
GB8829228 1988-12-15
GB8900202 1989-01-05
GB898900202A GB8900202D0 (en) 1989-01-05 1989-01-05 Light fitting

Publications (2)

Publication Number Publication Date
EP0378918A1 true EP0378918A1 (de) 1990-07-25
EP0378918B1 EP0378918B1 (de) 1994-06-22

Family

ID=26294732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890313171 Revoked EP0378918B1 (de) 1988-12-15 1989-12-15 Beleuchtungsvorrichtung

Country Status (2)

Country Link
EP (1) EP0378918B1 (de)
DE (1) DE68916403D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10161468A1 (de) * 2001-12-13 2003-07-03 Klaus-Peter Scherer Leuchte

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1950130A (en) * 1932-02-11 1934-03-06 Barlow Lamp fixture
US3749906A (en) * 1972-03-13 1973-07-31 Wagner Electric Corp Vehicle headlamp shield
GB2009384A (en) * 1977-12-01 1979-06-13 Sun Chemical Corp Light refelctor
US4386392A (en) * 1980-11-17 1983-05-31 Whiteway Manufacturing Co. Lighting unit for providing indirect light of uniform intensity
EP0137654A1 (de) * 1983-08-16 1985-04-17 Achorland Limited Aufwärtsbeleuchtungseinrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1950130A (en) * 1932-02-11 1934-03-06 Barlow Lamp fixture
US3749906A (en) * 1972-03-13 1973-07-31 Wagner Electric Corp Vehicle headlamp shield
GB2009384A (en) * 1977-12-01 1979-06-13 Sun Chemical Corp Light refelctor
US4386392A (en) * 1980-11-17 1983-05-31 Whiteway Manufacturing Co. Lighting unit for providing indirect light of uniform intensity
EP0137654A1 (de) * 1983-08-16 1985-04-17 Achorland Limited Aufwärtsbeleuchtungseinrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10161468A1 (de) * 2001-12-13 2003-07-03 Klaus-Peter Scherer Leuchte
DE10161468B4 (de) * 2001-12-13 2004-02-05 Klaus-Peter Scherer Leuchte mit mehreren Reflektoren

Also Published As

Publication number Publication date
EP0378918B1 (de) 1994-06-22
DE68916403D1 (de) 1994-07-28

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