EP1151226B1 - Reflector - Google Patents

Reflector Download PDF

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Publication number
EP1151226B1
EP1151226B1 EP99959570A EP99959570A EP1151226B1 EP 1151226 B1 EP1151226 B1 EP 1151226B1 EP 99959570 A EP99959570 A EP 99959570A EP 99959570 A EP99959570 A EP 99959570A EP 1151226 B1 EP1151226 B1 EP 1151226B1
Authority
EP
European Patent Office
Prior art keywords
reflector
light
column
light source
tier
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
EP99959570A
Other languages
German (de)
French (fr)
Other versions
EP1151226A1 (en
Inventor
Kelvin John Austin
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.)
Abacus Holdings Ltd
Original Assignee
Abacus Holdings 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
Application filed by Abacus Holdings Ltd filed Critical Abacus Holdings Ltd
Publication of EP1151226A1 publication Critical patent/EP1151226A1/en
Application granted granted Critical
Publication of EP1151226B1 publication Critical patent/EP1151226B1/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
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/088—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device mounted on top of the standard, e.g. for pedestrian zones
    • 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

Definitions

  • the present invention relates to an improved reflector for a luminaire.
  • the reflector is particularly suitable for use with a luminaire which forms part of an exterior lighting system, in which the luminaire is one of an array of luminaires arranged to light an area such as a car park or a town centre.
  • Luminaires are known which can be arranged in an array to provide a lighting system to light an area such as a car park or a town centre. It is increasingly a problem with such systems that they are required to satisfy stringent planning regulations regarding both aesthetic considerations and light pollution, and also they are required to satisfy increasingly stringent technical specifications with regard to average and minimum lighting levels.
  • the problem of light pollution can be considered as three separate issues identified as skyglow, overspill and glare.
  • skyglow is meant the light from the luminaire that illuminates the sky.
  • overspill is meant the light which spreads into areas adjacent to the area which is being lit and by “glare” is meant the discomfort or impairment of vision experienced when part of the visual field is excessively bright in relation to the general surroundings.
  • Known luminaires comprise a housing, a reflector and a light source and are manufactured in a number of different shapes and sizes.
  • planning regulations control not only the light pollution available, but also the external appearance of the luminaire. In general, the less obtrusive the luminaire, the more likely the planning authorities are to approve it.
  • Known luminaires have the disadvantage that they cause unacceptably high levels of one or more of the above defined forms of light pollution, they may only be able to meet technical specifications for minimum illumination by having an inefficiently high average level of illumination and/or they may be aesthetically unacceptable.
  • the top surface ofthe reflector has been provided with a diffuse surface finish in order to provide lower intensity illumination around the base of the column with improved uniformity.
  • this diffuse reflector covers the entire top surface and requires a high sided main reflector, which in turn requires a deep outer luminaire edge, which may give rise to planning objections.
  • US-A-3433941 describes a lighting unit or luminaire comprising a light source, and a housing, which reflector has a light source facing surface for reflecting light, and includes a first upper tier and a second lower tier.
  • the present invention provides a reflector for a luminaire comprising a light source, a column and a housing, which reflector has a light source facing surface for reflecting light and includes a first upper tier and a second lower tier characterised in that the first upper tier has a light scattering surface arranged to direct the light from the light source generally vertically downwards towards the base of the column and the second lower tier has a high precision light reflecting surface arranged so as, in use, to direct the light towards the ground and away from the base ofthe column.
  • the reflector may be of any suitable shape, but in a preferred embodiment of the reflector according to the invention, it is generally square in plan.
  • the generally square plan shape of the reflector may be modified to improve the light output pattern, in particular by providing side reflector inserts and by clipping the corners ofboth the upper and lower tiers in order to reduce trapping of light in the corners.
  • the housing of the luminaire, in which the reflector is to be installed maybe of any suitable shape to receive the reflector, for example, it may be square or circular in plan.
  • the light source facing surface of the upper tier of the reflector which is designed to scatter the light and to direct a diffuse beam of light downwards towards the base of the column on which the luminaire is mounted, preferably has a dimpled surface.
  • the light source facing surface of the lower tier ofthe reflector which is designed to direct the light towards the ground, away from the base of the column, is preferably a highly polished high precision surface.
  • the reflector is preferably made from aluminium, but may alternatively be made of any other suitable material, such as aluminised plastic.
  • a luminaire shown generally at 10 comprises a housing 2, reflector 4, light source 6 and column 8.
  • the reflector 4 is substantially square in plan, and comprises a first, upper tier 12 and a second, lower tier 14.
  • the inner surface of the upper tier 12 is provided with a dimpled surface finish to scatter light.
  • the inner surface of the lower tier 14 is provided with a highly polished, high precision reflecting surface finish.
  • the reflector 4 is generally square in plan.
  • the corners 16, 16', 16" and 16"' of the upper tier 12 are clipped to reduce losses due to trapping of light.
  • the corners 18, 18', 18" and 18"' of the lower tier 14 are also clipped and additionally provided with reflector inserts to improve the light distribution.
  • Side reflector inserts 20, 20', 20" and 20'" are located along the side walls of the lower tier 14 to improve further the light distribution.
  • light originating from the light source 6 strikes the top and side inner surfaces of the upper tier 12 and is directed downwards towards the base of the column 8.
  • Light originating from the light source 6 also strikes the inner side surfaces of the lower tier 14 and is directed in a controlled manner towards the ground, away from the base of the column 8.

Abstract

A reflector for a luminaire comprises a light source (6), a column (8) and a housing (2), and has a light-source facing surface for reflecting light. The reflector (4) comprises a first, upper tier (12) having a light scattering surface arranged so as, in use, to direct the light from the light source generally vertically downwards towards the base of the column and a second, lower tier (14) having a high precision light reflecting surface arranged so as, in use, to direct the light towards the ground and away from the base of the column. The reflector is preferably generally square in plan.

Description

  • The present invention relates to an improved reflector for a luminaire. The reflector is particularly suitable for use with a luminaire which forms part of an exterior lighting system, in which the luminaire is one of an array of luminaires arranged to light an area such as a car park or a town centre.
  • Luminaires are known which can be arranged in an array to provide a lighting system to light an area such as a car park or a town centre. It is increasingly a problem with such systems that they are required to satisfy stringent planning regulations regarding both aesthetic considerations and light pollution, and also they are required to satisfy increasingly stringent technical specifications with regard to average and minimum lighting levels.
  • The problem of light pollution can be considered as three separate issues identified as skyglow, overspill and glare.
  • By "skyglow" is meant the light from the luminaire that illuminates the sky. By "overspill" is meant the light which spreads into areas adjacent to the area which is being lit and by "glare" is meant the discomfort or impairment of vision experienced when part of the visual field is excessively bright in relation to the general surroundings.
  • Known luminaires comprise a housing, a reflector and a light source and are manufactured in a number of different shapes and sizes. As noted above, planning regulations control not only the light pollution available, but also the external appearance of the luminaire. In general, the less obtrusive the luminaire, the more likely the planning authorities are to approve it.
  • Known luminaires have the disadvantage that they cause unacceptably high levels of one or more of the above defined forms of light pollution, they may only be able to meet technical specifications for minimum illumination by having an inefficiently high average level of illumination and/or they may be aesthetically unacceptable.
  • In a known design of reflector, the top surface ofthe reflector has been provided with a diffuse surface finish in order to provide lower intensity illumination around the base of the column with improved uniformity. In the case of a vertically burning light source, this diffuse reflector covers the entire top surface and requires a high sided main reflector, which in turn requires a deep outer luminaire edge, which may give rise to planning objections.
  • US-A-3433941 describes a lighting unit or luminaire comprising a light source, and a housing, which reflector has a light source facing surface for reflecting light, and includes a first upper tier and a second lower tier.
  • The present invention provides a reflector for a luminaire comprising a light source, a column and a housing, which reflector has a light source facing surface for reflecting light and includes a first upper tier and a second lower tier characterised in that the first upper tier has a light scattering surface arranged to direct the light from the light source generally vertically downwards towards the base of the column and the second lower tier has a high precision light reflecting surface arranged so as, in use, to direct the light towards the ground and away from the base ofthe column.
  • The reflector may be of any suitable shape, but in a preferred embodiment of the reflector according to the invention, it is generally square in plan. The generally square plan shape of the reflector may be modified to improve the light output pattern, in particular by providing side reflector inserts and by clipping the corners ofboth the upper and lower tiers in order to reduce trapping of light in the corners.
  • The housing of the luminaire, in which the reflector is to be installed maybe of any suitable shape to receive the reflector, for example, it may be square or circular in plan.
  • The light source facing surface of the upper tier of the reflector, which is designed to scatter the light and to direct a diffuse beam of light downwards towards the base of the column on which the luminaire is mounted, preferably has a dimpled surface.
  • The light source facing surface of the lower tier ofthe reflector, which is designed to direct the light towards the ground, away from the base of the column, is preferably a highly polished high precision surface.
  • The reflector is preferably made from aluminium, but may alternatively be made of any other suitable material, such as aluminised plastic.
  • An embodiment of a reflector for a luminaire will now be described with reference to the accompanying drawings, in which
    • Figure 1 is a side view, in section, of an embodiment of a reflector installed within a luminaire;
    • Figure 2 is a plan view of the reflector of Figure 1 and
    • Figure 3 is a similar view to that of Figure 1, with a simplified schematic view of the light output.
  • As can be seen from Figure 1, a luminaire shown generally at 10 comprises a housing 2, reflector 4, light source 6 and column 8.
  • The reflector 4 is substantially square in plan, and comprises a first, upper tier 12 and a second, lower tier 14. The inner surface of the upper tier 12 is provided with a dimpled surface finish to scatter light. The inner surface of the lower tier 14 is provided with a highly polished, high precision reflecting surface finish.
  • As can be seen from Figure 2, the reflector 4 is generally square in plan. The corners 16, 16', 16" and 16"' of the upper tier 12 are clipped to reduce losses due to trapping of light.
  • In a similar manner, the corners 18, 18', 18" and 18"' of the lower tier 14 are also clipped and additionally provided with reflector inserts to improve the light distribution. Side reflector inserts 20, 20', 20" and 20'" are located along the side walls of the lower tier 14 to improve further the light distribution.
  • As can be seen from Figure 3, light originating from the light source 6 strikes the top and side inner surfaces of the upper tier 12 and is directed downwards towards the base of the column 8. Light originating from the light source 6 also strikes the inner side surfaces of the lower tier 14 and is directed in a controlled manner towards the ground, away from the base of the column 8.
  • Since the lamp arc of the light source 6 is in the same plane as the lower tier 14 of the reflector, there is no direct upward light.

Claims (9)

  1. Areflector(4) for a luminaire comprising a light source (6), a column (8) and a housing (2), which reflector has a light-source facing surface for reflecting light and includes a first upper tier (12), and a second lower tier (14), characterised in that the first upper tier (12) has a light scattering surface arranged to direct light from the light source generally vertically downwards towards the base of the column, and the second lower tier (14) has a high precision light reflecting surface arranged to direct the light towards the ground and away from the base of the column.
  2. A reflector as claimed in claim 1, characterised in that it is generally square in plan.
  3. A reflector as claimed in claim 2, characterised in that it comprises side reflector inserts (20,201,2011,20111) located in the side walls of the lower tier.
  4. A reflector as claimed in claim 2 or claim 3, characterised in that the corners of both the upper and lower tiers are clipped.
  5. A reflector as claimed in any of claims 1 to 4 characterised in that the light source facing surface of the upper tier of the reflector has a dimpled surface.
  6. A reflector as claimed in any of claims 1 to 5 characterised in that the light source facing surface of the lower tier of the reflector has a highly polished high precision surface.
  7. A reflector as claimed in any of claims 1 to 6 characterised in that the reflector is made from aluminium.
  8. A luminaire comprising a reflector, a light source, a column and a housing characterised in that it comprises a reflector as claimed in any of claims 1 to 7.
  9. A luminaire as claimed in claim 8 characterised in that the housing is circular in plan.
EP99959570A 1999-02-13 1999-12-10 Reflector Expired - Lifetime EP1151226B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9903182 1999-02-13
GBGB9903182.5A GB9903182D0 (en) 1999-02-13 1999-02-13 Improved reflector
PCT/GB1999/004169 WO2000047931A1 (en) 1999-02-13 1999-12-10 Reflector

Publications (2)

Publication Number Publication Date
EP1151226A1 EP1151226A1 (en) 2001-11-07
EP1151226B1 true EP1151226B1 (en) 2007-01-24

Family

ID=10847624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99959570A Expired - Lifetime EP1151226B1 (en) 1999-02-13 1999-12-10 Reflector

Country Status (8)

Country Link
EP (1) EP1151226B1 (en)
CN (1) CN1125942C (en)
AT (1) ATE352749T1 (en)
DE (1) DE69935011T2 (en)
ES (1) ES2281200T3 (en)
GB (1) GB9903182D0 (en)
HK (1) HK1043181A1 (en)
WO (1) WO2000047931A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1209409B1 (en) * 2000-11-28 2010-06-16 Siteco Beleuchtungstechnik GmbH Outdoor lamp having an improved illumination output
ITMI20050595A1 (en) 2005-04-08 2006-10-09 Guzzini Illuminazi0Ni S P A I COLUMN LIGHTING DEVICE

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433941A (en) * 1966-12-30 1969-03-18 Crouse Hinds Co Lighting unit
US3746854A (en) * 1972-05-30 1973-07-17 J Brass Tangent plane light reflector luminaire
US4234912A (en) * 1978-06-28 1980-11-18 International Telephone And Telegraph Corporation Luminaire for residential roadway lighting
JPS5645507A (en) * 1979-09-21 1981-04-25 Toshiba Electric Equip Lighting device
US5816694A (en) * 1996-06-28 1998-10-06 General Electric Company Square distribution reflector
EP0881425B1 (en) * 1997-05-26 2003-03-19 Christian Bartenbach Lamp

Also Published As

Publication number Publication date
GB9903182D0 (en) 1999-04-07
DE69935011T2 (en) 2007-11-15
EP1151226A1 (en) 2001-11-07
CN1346431A (en) 2002-04-24
ATE352749T1 (en) 2007-02-15
ES2281200T3 (en) 2007-09-16
DE69935011D1 (en) 2007-03-15
HK1043181A1 (en) 2002-09-06
CN1125942C (en) 2003-10-29
WO2000047931A1 (en) 2000-08-17

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