EP1376008A2 - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
EP1376008A2
EP1376008A2 EP03019736A EP03019736A EP1376008A2 EP 1376008 A2 EP1376008 A2 EP 1376008A2 EP 03019736 A EP03019736 A EP 03019736A EP 03019736 A EP03019736 A EP 03019736A EP 1376008 A2 EP1376008 A2 EP 1376008A2
Authority
EP
European Patent Office
Prior art keywords
source
reflecting
lighting device
light
reflector
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
EP03019736A
Other languages
German (de)
French (fr)
Other versions
EP1376008A3 (en
EP1376008B1 (en
Inventor
Claudia Bigliati
Piero Perlo
Sabino Sinesi
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.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
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=11457695&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1376008(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Centro Ricerche Fiat SCpA filed Critical Centro Ricerche Fiat SCpA
Publication of EP1376008A2 publication Critical patent/EP1376008A2/en
Publication of EP1376008A3 publication Critical patent/EP1376008A3/en
Application granted granted Critical
Publication of EP1376008B1 publication Critical patent/EP1376008B1/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
    • 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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing 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
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2106/00—Interior vehicle lighting devices
    • 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

  • This invention relates to lighting devices for use in motor vehicles, for example for illuminating the passenger compartment, or in homes or offices and public working premises.
  • This invention particularly relates to a lighting device of the type indicated in the the pre-characterizing portion of of claim 1.
  • a device of this type is known from DE 3 702 236.
  • Other lighting devices are known from GB 1 021 109 and EP 0 766 037.
  • the purpose of this invention is to realise a lighting device presenting high efficiency and a simple, cost-effective, small sized structure.
  • this invention relates to a lighting device having all the features indicated in claim 1.
  • the device according to this invention can be equipped with a lens arranged in front of the primary reflector and the secondary reflector with an internal surface which may be partially or totally equipped with micro prisms.
  • numeral 1 generally indicates a lighting device comprising a pair of light sources 2 in the shape of fluorescent tubes, with an extended longitudinal direction.
  • a reflecting structure indicated generally with reference numeral 3, is associated to the two light sources.
  • the reflecting structure presents a primary reflector 4 and a secondary reflector 5, associated to each light source 2
  • Each primary reflector 4 presents, on a plane with is perpendicular to the longitudinal direction of the light sources 2 (see figure 2) a profile consisting of two volute sections 6, 7, presenting concave surfaces facing the source 2 and joined together to form a cusp 8, located in immediately adjacent to the source 2.
  • the axis 4a of the double cusp is slanted towards the secondary reflector 5.
  • Each secondary reflector 5 presents a plurality of active reflecting sectors 9 corresponding, for example, to portions of a parabola or presenting a complex geometry of any type. Slots 13 are made between the active portions 9 of the secondary reflector and each active portion 9 is equipped with an additional tab 14 for reflecting the light rays hitting its rear surface (with reference to the main output direction of the light beam) in the opposite direction to said main direction.
  • the secondary reflectors 5 reflect the light rays directly from the light source 2 either associated to it or reflected by the primary reflector 4 outwards (i.e. rightwards with reference to figure 2) .
  • the light device presents high efficiency (in the order of 80%) of extraction of the light in the output direction of the light flow with respect to the total output energy.
  • the dimension of the device in the direction of output of the light beam is extremely reduced, which makes the device suitable, for example, also to illuminate rooms in homes or working premises fitted to the ceiling or the wall with the two secondary reflectors 5 both adjacent to the ceiling, because, in this position, the device will only slightly project from the surface on which it is fastened.
  • Figure 3 illustrates a variation with a single source 2, presenting a profile which essentially corresponds to one half of the profile in figure 2.
  • Figure 4 illustrates a variation which differs from the solution in figure 2 only for the fact that it is provided with a lens 11 which closes the front of the device and which has an internal surface partially or totally provided with micro prisms 12.
  • the solution in figure 5 can be used, for example, for illuminating the inside of vertical light panels visible on both sides, such as the case, for example, of light panels which indicate fire exits in public venues or working premises.
  • the central part of the device is more extended outwards, over the edge of the wall or ceiling. This solution is particularly suitable for ceiling applications in which the depth of the device must be reduced and good beam direction control is required at the same time.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Substances (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

Lighting device comprising a light source (2), a primary reflector (4), presenting a double volute (6, 7) cross-section profile and a secondary reflector (5), which reflects the light rays directly from the source (2) and from the primary reflector (4) to form a light beam directed outwards.

Description

  • This invention relates to lighting devices for use in motor vehicles, for example for illuminating the passenger compartment, or in homes or offices and public working premises.
  • This invention particularly relates to a lighting device of the type indicated in the the pre-characterizing portion of of claim 1. A device of this type is known from DE 3 702 236. Other lighting devices are known from GB 1 021 109 and EP 0 766 037.
  • The purpose of this invention is to realise a lighting device presenting high efficiency and a simple, cost-effective, small sized structure.
  • In order to attain this purpose, this invention relates to a lighting device having all the features indicated in claim 1.
  • The device according to this invention can be equipped with a lens arranged in front of the primary reflector and the secondary reflector with an internal surface which may be partially or totally equipped with micro prisms.
  • This invention will be better explained by the following detailed descriptions with reference to the accompanying figure as non-limiting example, whereas:
    • figure 1 is a prospective schematic view of an example of embodiment of the lighting device according to this invention,
    • figure 2 is a cross-section view according to the line II-II in figure 1,
    • figure 3 is a variation of figure 2 and
    • figures from 4 to 6 illustrate two additional variations of figure 2.
  • With reference to figures 1, 2, and 5 numeral 1 generally indicates a lighting device comprising a pair of light sources 2 in the shape of fluorescent tubes, with an extended longitudinal direction. A reflecting structure, indicated generally with reference numeral 3, is associated to the two light sources. As clearly visible in figure 2, the reflecting structure presents a primary reflector 4 and a secondary reflector 5, associated to each light source 2, Each primary reflector 4 presents, on a plane with is perpendicular to the longitudinal direction of the light sources 2 (see figure 2) a profile consisting of two volute sections 6, 7, presenting concave surfaces facing the source 2 and joined together to form a cusp 8, located in immediately adjacent to the source 2. The axis 4a of the double cusp is slanted towards the secondary reflector 5. Each secondary reflector 5 presents a plurality of active reflecting sectors 9 corresponding, for example, to portions of a parabola or presenting a complex geometry of any type. Slots 13 are made between the active portions 9 of the secondary reflector and each active portion 9 is equipped with an additional tab 14 for reflecting the light rays hitting its rear surface (with reference to the main output direction of the light beam) in the opposite direction to said main direction.
  • During operation, the secondary reflectors 5 reflect the light rays directly from the light source 2 either associated to it or reflected by the primary reflector 4 outwards (i.e. rightwards with reference to figure 2) .
  • Thanks to the particular geometry described above, the light device presents high efficiency (in the order of 80%) of extraction of the light in the output direction of the light flow with respect to the total output energy. At the same time, the dimension of the device in the direction of output of the light beam is extremely reduced, which makes the device suitable, for example, also to illuminate rooms in homes or working premises fitted to the ceiling or the wall with the two secondary reflectors 5 both adjacent to the ceiling, because, in this position, the device will only slightly project from the surface on which it is fastened.
  • Figure 3 illustrates a variation with a single source 2, presenting a profile which essentially corresponds to one half of the profile in figure 2.
  • Figure 4 illustrates a variation which differs from the solution in figure 2 only for the fact that it is provided with a lens 11 which closes the front of the device and which has an internal surface partially or totally provided with micro prisms 12.
  • The solution in figure 5 can be used, for example, for illuminating the inside of vertical light panels visible on both sides, such as the case, for example, of light panels which indicate fire exits in public venues or working premises.
  • In the variant in figure 6, the central part of the device is more extended outwards, over the edge of the wall or ceiling. This solution is particularly suitable for ceiling applications in which the depth of the device must be reduced and good beam direction control is required at the same time.
  • Naturally, numerous changes can be implemented to the construction and forms of embodiment of the invention herein envisaged, all comprised within the context of the concept characterising this invention, as defined by the following claims.

Claims (7)

  1. Lighting device comprising a light source (2) which is extending longitudinally and reflecting devices (4, 5) for reflecting the light rays output by the source (2) in such a way for form an extending, wide beam output by the device, wherein
    said reflecting devices comprise:
    a primary reflector(4), arranged adjacently on one side of the light source (2), for reflecting the light rays output by the source (2) and
    a secondary reflector (5), for picking up both the light rays directly from the source (2) and the light rays reflected by the main reflector (4) and conveying said light rays to form a light beam of a predetermined shape outwards,
    said primary reflector presents a section on a plane, which is perpendicular to the longitudinal axis of the source (2), comprising two volute sections (6, 7), which concavities face the source (2), joined to form a cusp (8) immediately adjacent to the source (2) and
    said secondary reflector (5) presents a section, on a plane, which is perpendicular to the longitudinal axis of the source (2), comprising a set of reflecting sectors (9) arranged in steps,
    characterised in that the reflecting sectors (9) of the secondary reflector (5) are separated by slots (13) and are equipped each with a reflecting tab (14) for reflecting the light rays from the light source (2) and from the primary reflector (4) in the opposite direction with respect to the main output direction of the light beam from the device, through said slots (13).
  2. Lighting device according to claim 1, characterised in that the light source (2) is a fluorescent tube, for example type T8 or T5.
  3. Lighting device according to claim 1, characterised in that the light source (2) is an incandescence, halogen or discharge bulb.
  4. Lighting device according to any of the previous claims, characterised in that it comprises a pair of extended light sources, respectively parallel and spaced, each equipped with a primary reflector and a secondary reflector of the type specified above, with the secondary reflectors (5) essentially reciprocal co-planar and the joined along the longitudinal edge (15).
  5. Lighting device according to any of the previous claims, characterised in that it comprises a transparent element (11) located in front of the reflecting devices (4, 5).
  6. Lighting device according to claim 5, characterised in that the transparent element (11) presents an internal surface which is partially or totally equipped with micro prisms (12).
  7. Lighting device according to claim 1, characterised in that the double volute section (6, 7) of the primary reflector (4) presents an axis which is slanted towards the secondary reflector (5).
EP03019736A 2000-05-02 2001-04-30 Lighting device Expired - Lifetime EP1376008B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITTO20000407 2000-05-02
IT2000TO000407A IT1320063B1 (en) 2000-05-02 2000-05-02 LIGHTING DEVICE.
EP01830287A EP1152187B1 (en) 2000-05-02 2001-04-30 Lighting device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP01830287A Division EP1152187B1 (en) 2000-05-02 2001-04-30 Lighting device

Publications (3)

Publication Number Publication Date
EP1376008A2 true EP1376008A2 (en) 2004-01-02
EP1376008A3 EP1376008A3 (en) 2004-01-28
EP1376008B1 EP1376008B1 (en) 2004-11-17

Family

ID=11457695

Family Applications (2)

Application Number Title Priority Date Filing Date
EP01830287A Expired - Lifetime EP1152187B1 (en) 2000-05-02 2001-04-30 Lighting device
EP03019736A Expired - Lifetime EP1376008B1 (en) 2000-05-02 2001-04-30 Lighting device

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP01830287A Expired - Lifetime EP1152187B1 (en) 2000-05-02 2001-04-30 Lighting device

Country Status (4)

Country Link
EP (2) EP1152187B1 (en)
DE (2) DE60107297T8 (en)
ES (2) ES2231423T3 (en)
IT (1) IT1320063B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1720731A2 (en) * 2004-02-19 2006-11-15 Gelcore LLC Off-axis parabolic reflector
CN102022674A (en) * 2009-09-21 2011-04-20 贝希托尔德控股有限公司 Surgical light

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60308030D1 (en) * 2003-10-23 2006-10-12 Pizziga Jean Pierre Reflector for an annular fluorescent lamp
JP6237083B2 (en) * 2013-10-07 2017-11-29 市光工業株式会社 Vehicle lighting
ES2556566B1 (en) * 2014-07-10 2016-11-02 Lledó Iluminación Sa Modular luminescent device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1021159A (en) * 1963-11-18 1966-03-02 Lucas Industries Ltd Lamps
DE3702236A1 (en) * 1986-01-27 1987-12-10 Steinecke Wolfhart Reflector lamp for the indirect lighting of a room
EP0766037A1 (en) * 1995-09-27 1997-04-02 MAGNETI MARELLI S.p.A. Lighting device that can be constructed with reduced thickness, especially a headlamp or other external vehicle lamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1021159A (en) * 1963-11-18 1966-03-02 Lucas Industries Ltd Lamps
DE3702236A1 (en) * 1986-01-27 1987-12-10 Steinecke Wolfhart Reflector lamp for the indirect lighting of a room
EP0766037A1 (en) * 1995-09-27 1997-04-02 MAGNETI MARELLI S.p.A. Lighting device that can be constructed with reduced thickness, especially a headlamp or other external vehicle lamp

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1720731A2 (en) * 2004-02-19 2006-11-15 Gelcore LLC Off-axis parabolic reflector
EP1720731A4 (en) * 2004-02-19 2008-07-02 Gelcore Llc Off-axis parabolic reflector
CN102022674A (en) * 2009-09-21 2011-04-20 贝希托尔德控股有限公司 Surgical light

Also Published As

Publication number Publication date
ITTO20000407A1 (en) 2001-11-02
EP1376008A3 (en) 2004-01-28
DE60107297D1 (en) 2004-12-23
EP1152187A3 (en) 2002-11-13
ES2231752T3 (en) 2005-05-16
IT1320063B1 (en) 2003-11-12
EP1152187A2 (en) 2001-11-07
EP1376008B1 (en) 2004-11-17
DE60107297T2 (en) 2006-02-09
DE60107297T8 (en) 2006-04-27
DE60107139D1 (en) 2004-12-23
EP1152187B1 (en) 2004-11-17
ITTO20000407A0 (en) 2000-05-02
ES2231423T3 (en) 2005-05-16
DE60107139T2 (en) 2006-02-09

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