EP2252827B1 - Lighting device including a led - Google Patents

Lighting device including a led Download PDF

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Publication number
EP2252827B1
EP2252827B1 EP09719975.6A EP09719975A EP2252827B1 EP 2252827 B1 EP2252827 B1 EP 2252827B1 EP 09719975 A EP09719975 A EP 09719975A EP 2252827 B1 EP2252827 B1 EP 2252827B1
Authority
EP
European Patent Office
Prior art keywords
lens
led
support
elongated body
support structure
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.)
Active
Application number
EP09719975.6A
Other languages
German (de)
French (fr)
Other versions
EP2252827A2 (en
Inventor
Enzo Catellani
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
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Individual
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Publication of EP2252827A2 publication Critical patent/EP2252827A2/en
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Publication of EP2252827B1 publication Critical patent/EP2252827B1/en
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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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • 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
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a lighting device including a LED of the type specified in the preamble of Claim 1 of the kind described for example in patent applications JP-A-2004296249 , JP-A-2004Z96245 , US-A-2004/156199 , WO-A-98/55799 , US-A-2002/191396 and WO-A-2006/090858 .
  • LEDs (acronym for light emitting diode) recently used to light various spaces, such as: domestic spaces, offices, open spaces such as squares and gardens and the like.
  • LED lighting devices have various advantages with respect to more conventional lighting devices, such as incandescent lamps and fluorescent lamps.
  • LEDs have a very small volume, even less than one cm 3 , very high efficiency, produce a light that can obtain a desired colour, switch on very quickly when energized by electrical current and so forth.
  • LED lighting devices also have some considerable drawbacks.
  • LEDs produce a diffused lighting which is not suitable for particular atmospheres or for indoor spaces.
  • the technical aim of the present invention is to devise a lighting device including a LED capable of substantially overcoming the aforesaid drawbacks.
  • an important object of the invention is to achieve a lighting device including a LED which produces diffused lighting.
  • the lighting device according to the invention is indicated as a whole with the number 1.
  • It comprises at least one LED 2, a support structure 3 for the LED 2 and a lens 4, placed over the LED 2, supported by the support structure 3 and suitable to modify the lighting of the LED 2 in particular to create diffused lighting.
  • the lens 4 is conveniently made of crystal or alternatively glass, or generally vitreous material, polymer or silicone.
  • the lens 4 has a base diameter preferably of between 1 cm and 10 cm and more preferably between 1 cm and 5 cm, a height of between 0.4 cm and 6 cm and more preferably between 1 cm and 3 cm and a diameter to height ratio preferably between 2 and 4 and more preferably between 2.5 and 3.5.
  • two sizes of lens 4 are provided, one with a diameter of between 18 mm and 22 mm and a height between 6 mm and 9 mm and the other with a diameter of between 30 mm and 36 mm and a height between 9 mm and 12 mm.
  • a grinding of between 1 mm and 3 mm is also provided on the flat base to avoid the creation of sharp corners.
  • the LED 2 is realized by a printed circuit 2a and a bulb, or primary lens 2b.
  • the printed circuit 2a is conveniently substantially rectangular and flat and has base dimensions of between 1 mm and 5 mm.
  • the bulb 2b is made of polymer or silicone material, or glass and preferably has an external diameter of between 0.3 mm and 3 mm and more preferably between 1.5 mm and 2 mm. Moreover, it has a substantially semi-spherical shape.
  • the LED 2 has a power of between 1 W and 50 W and more preferably between 1 W and 20 W and even more preferably around 20 W.
  • the support structure 3 is conveniently a rod extending prevalently along a single direction and comprising a curved portion, as specified below.
  • the support structure 3 comprises an elongated body 6, preferably a rod, tubular and hollow and therefore comprising a cavity 6a.
  • metal preferably nickel plated copper, preferably with a substantially circular normal section, and with a diameter preferably of between 1 mm and 30 mm, more preferably between 2 mm and 6 mm.
  • the elongated body 6 comprises support means 7 of the LED 2. They include a support surface 7a, part of the elongated body 6 and preferably defined by a flattened portion of this elongated body 6, and a plate 8 fixed to the support surface 7a and suitable to support the LED 2 directly.
  • the plate 8 is conveniently rectangular and made of aluminium alloy; moreover, it has a thickness close to the diameter of the elongated body 6, a length of between 2 and 3 cm and a height between 0.5 mm and 3 mm.
  • the elongated body 6 allows optimum dispersion of the heat coming from the LED 2 and houses therein electrical connections 9 for the LED 2.
  • the support structure 3 also preferably comprises a support element 5, suitable to support the lens 4.
  • the support element 5 is part of the support structure 3 and is suitable to support the lens 4 so that this is placed in proximity of the LED 2 but not in direct contact therewith, as shown in Fig. 2 .
  • the support element 5 is conveniently realized by an extension of the end portion of the elongated body 6, conveniently bent in a U, as shown in Fig. 2 .
  • the support element 5 allows support of the lens 4, preferably placed in a direction parallel to the direction of the plane on which the circuit 2a of the LED 2 lies, and at a distance therefrom.
  • the distance between the LED 2 and the lens 4 is between 0.5 mm and 10 mm, and more preferably between 1 mm and 4 mm, therefrom.
  • the lens 4 is preferably disposed so that the centre of the circumference is aligned vertically to the LED 2, as shown in Fig. 1 .
  • the upper part of the support element 5 therefore has a greater length in the case in which the lens 4 has a smaller diameter.
  • the lens 4 is then connected using a specific glue to the support element 5, for a length of less than on centimetre.
  • the elongated body 6 is also preferably flattened at the support element 5, so as to form an ellipsoidal section with a ratio between dimensions of around one half and with the major axis parallel to the plate 8.
  • the support element 5 is preferably provided separable from the elongated body 6.
  • releasable mechanical connection means 10 are provided between the element 5 and the elongated body 6.
  • the elongated body 6 comprises a preferably circular hollow terminal end 6b.
  • the tubular body 6 has a length preferably greater than 5 mm, as shown in Fig. 1 , and more preferably of between 0.8 cm and 2 cm.
  • connection means 10 which are completed by a circular pin 11, integral with the support element 5 and counter-shaped to the cavity 6a, therefore circular and having a diameter preferably of between 1 mm and 3 mm.
  • connection means 10 can be provided, equipped with directional elements which prevent rotation of the support element 5 inside the cavity 6a in the direction parallel thereto.
  • the lighting device 1 achieves important advantages. In fact, by means of the presence of the lens 4, the device 1 produces a particular bubble or bulb lighting, optimal for lighting both indoor and outdoor spaces.
  • the arrangement of the lens 4, not in direct contact with the LED 2, allows high dissipation of the heat that is created in the LED 2.
  • the lens 2 is releasable from the LED 2 and thus allows the latter to be used in different modes and situations.
  • the support element 5 can in fact be removed and replaced immediately and with another support element provided with a different lens 4.
  • the structure is simple and solid, as well as easy to produce.
  • fixing of the lens 4 on the support element 5, by means of a simple glue is immediate and can be performed with precision, without the need for further elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)

Description

  • The present invention relates to a lighting device including a LED of the type specified in the preamble of Claim 1 of the kind described for example in patent applications JP-A-2004296249 , JP-A-2004Z96245 , US-A-2004/156199 , WO-A-98/55799 , US-A-2002/191396 and WO-A-2006/090858 .
  • There are currently known LEDs (acronym for light emitting diode) recently used to light various spaces, such as: domestic spaces, offices, open spaces such as squares and gardens and the like.
  • LED lighting devices have various advantages with respect to more conventional lighting devices, such as incandescent lamps and fluorescent lamps.
  • In particular, LEDs have a very small volume, even less than one cm3, very high efficiency, produce a light that can obtain a desired colour, switch on very quickly when energized by electrical current and so forth.
  • As well as said advantages, LED lighting devices also have some considerable drawbacks.
  • In fact, LEDs produce a diffused lighting which is not suitable for particular atmospheres or for indoor spaces.
  • It is possible to vary said lighting by means of lenses outside the LED, but these require the production of a complex structure, which is aesthetically unappealing and above all reduces heat dissipation of these LEDS and therefore the lifespan thereof.
  • In this situation the technical aim of the present invention is to devise a lighting device including a LED capable of substantially overcoming the aforesaid drawbacks.
  • Within said technical aim an important object of the invention is to achieve a lighting device including a LED which produces diffused lighting.
  • The technical aim and the objects specified are achieved by a lighting device including a LED as described in the appended Claim 1.
  • Preferred embodiments are highlighted in the dependent claims.
  • Preferred embodiments of the invention are shown by way of example in the accompanying drawings. In particular:
    • Fig. 1 shows a top view of the lighting device according to the invention;
    • Fig. 2 shows a side view of the lighting device; and
    • Fig. 3 shows a side view of the lighting device in a different configuration.
  • With reference to the Figures, the lighting device according to the invention is indicated as a whole with the number 1.
  • It comprises at least one LED 2, a support structure 3 for the LED 2 and a lens 4, placed over the LED 2, supported by the support structure 3 and suitable to modify the lighting of the LED 2 in particular to create diffused lighting.
  • In detail, the lens 4 is conveniently made of crystal or alternatively glass, or generally vitreous material, polymer or silicone.
  • It conveniently has a substantially spherical cap shape having the lower part with a substantially flat surface.
  • In particular, the lens 4 has a base diameter preferably of between 1 cm and 10 cm and more preferably between 1 cm and 5 cm, a height of between 0.4 cm and 6 cm and more preferably between 1 cm and 3 cm and a diameter to height ratio preferably between 2 and 4 and more preferably between 2.5 and 3.5.
  • In detail, two sizes of lens 4 are provided, one with a diameter of between 18 mm and 22 mm and a height between 6 mm and 9 mm and the other with a diameter of between 30 mm and 36 mm and a height between 9 mm and 12 mm. In both cases, a grinding of between 1 mm and 3 mm is also provided on the flat base to avoid the creation of sharp corners.
  • The LED 2 is realized by a printed circuit 2a and a bulb, or primary lens 2b. The printed circuit 2a is conveniently substantially rectangular and flat and has base dimensions of between 1 mm and 5 mm.
  • The bulb 2b, or primary lens, is made of polymer or silicone material, or glass and preferably has an external diameter of between 0.3 mm and 3 mm and more preferably between 1.5 mm and 2 mm. Moreover, it has a substantially semi-spherical shape.
  • The LED 2 has a power of between 1 W and 50 W and more preferably between 1 W and 20 W and even more preferably around 20 W.
  • The support structure 3 is conveniently a rod extending prevalently along a single direction and comprising a curved portion, as specified below.
  • In particular, the support structure 3 comprises an elongated body 6, preferably a rod, tubular and hollow and therefore comprising a cavity 6a.
  • It is made of metal, preferably nickel plated copper, preferably with a substantially circular normal section, and with a diameter preferably of between 1 mm and 30 mm, more preferably between 2 mm and 6 mm.
  • The elongated body 6 comprises support means 7 of the LED 2. They include a support surface 7a, part of the elongated body 6 and preferably defined by a flattened portion of this elongated body 6, and a plate 8 fixed to the support surface 7a and suitable to support the LED 2 directly.
  • The plate 8 is conveniently rectangular and made of aluminium alloy; moreover, it has a thickness close to the diameter of the elongated body 6, a length of between 2 and 3 cm and a height between 0.5 mm and 3 mm.
  • The elongated body 6 allows optimum dispersion of the heat coming from the LED 2 and houses therein electrical connections 9 for the LED 2.
  • The support structure 3 also preferably comprises a support element 5, suitable to support the lens 4.
  • The support element 5 is part of the support structure 3 and is suitable to support the lens 4 so that this is placed in proximity of the LED 2 but not in direct contact therewith, as shown in Fig. 2.
  • In this regard, the support element 5 is conveniently realized by an extension of the end portion of the elongated body 6, conveniently bent in a U, as shown in Fig. 2.
  • In particular, the support element 5 allows support of the lens 4, preferably placed in a direction parallel to the direction of the plane on which the circuit 2a of the LED 2 lies, and at a distance therefrom.
  • In detail, the distance between the LED 2 and the lens 4 is between 0.5 mm and 10 mm, and more preferably between 1 mm and 4 mm, therefrom. Moreover, the lens 4 is preferably disposed so that the centre of the circumference is aligned vertically to the LED 2, as shown in Fig. 1. The upper part of the support element 5 therefore has a greater length in the case in which the lens 4 has a smaller diameter.
  • The lens 4 is then connected using a specific glue to the support element 5, for a length of less than on centimetre.
  • The elongated body 6 is also preferably flattened at the support element 5, so as to form an ellipsoidal section with a ratio between dimensions of around one half and with the major axis parallel to the plate 8.
  • Moreover, the support element 5 is preferably provided separable from the elongated body 6.
  • For this purpose, releasable mechanical connection means 10 are provided between the element 5 and the elongated body 6.
  • In particular, the elongated body 6 comprises a preferably circular hollow terminal end 6b.
  • Between the terminal end 6b and the support surface 7a, the tubular body 6 has a length preferably greater than 5 mm, as shown in Fig. 1, and more preferably of between 0.8 cm and 2 cm.
  • This end section of the tubular body 6 realizes part of the connection means 10, which are completed by a circular pin 11, integral with the support element 5 and counter-shaped to the cavity 6a, therefore circular and having a diameter preferably of between 1 mm and 3 mm.
  • Engagement between the element 5 and the tubular body 6 is therefore preferably forced coupling.
  • Alternatively, connection means 10 can be provided, equipped with directional elements which prevent rotation of the support element 5 inside the cavity 6a in the direction parallel thereto.
  • The lighting device 1 according to the invention achieves important advantages. In fact, by means of the presence of the lens 4, the device 1 produces a particular bubble or bulb lighting, optimal for lighting both indoor and outdoor spaces.
  • Moreover, the arrangement of the lens 4, not in direct contact with the LED 2, allows high dissipation of the heat that is created in the LED 2.
  • Furthermore, the lens 2 is releasable from the LED 2 and thus allows the latter to be used in different modes and situations. The support element 5 can in fact be removed and replaced immediately and with another support element provided with a different lens 4.
  • Finally, the structure is simple and solid, as well as easy to produce.
  • In particular, fixing of the lens 4 on the support element 5, by means of a simple glue, is immediate and can be performed with precision, without the need for further elements.
  • The invention is susceptible to modifications and variants falling within the inventive concert, as defined in the claims.

Claims (13)

  1. A lighting device (1) comprising at least one LED (2), at least one lens (4), a support structure (3) for said LED (2) and for said lens (4), said support structure (3) is a rod and being suitable to support said lens (4) at a distance from said LED (2) in a manner suitable to modify the lighting of said LED (2) and comprising: an elongated body (6) extending along a single prevalent direction of extension and support means (7) suitable to support said LED (2) characterized in that said support structure (3) further comprises a support element (5) suitable to support said lens (4) and realized by an extension of said elongated body (6) bent in a U.
  2. A device according to claim 1, wherein said support structure (3) supports said lens (4) at a distance of between 1 mm and 4 mm from said LED (4).
  3. A device according to one or more of the preceding claims, wherein said support structure (3) is made of copper alloy.
  4. A device according to one or more of the preceding claims, wherein said elongated body (6) is tubular and at least prevalently hollow.
  5. A device according to claim 4, wherein said lens (4) is engaged by gluing to said support element (5).
  6. A device according to one or more of claims 5 and 6, wherein said support structure (5) is separable from said elongated body (6) and wherein said support structure (3) comprises releasable mechanical connection means (10) between said support element (5) and said elongated body (6).
  7. A device according to claim 6, wherein said connection means (10) comprise a cavity (6a) and a circular pin (11) defining a coupling between said support element (5) and said elongated body (6).
  8. A device according to claim 7, wherein said elongated body (6) is tubular and at least prevalently hollow and has open ends, and wherein said support element (5) can engage with one of said open ends.
  9. A device according to one or more of the preceding claims, wherein said lens (4) is substantially realized by a spherical cap having a flat lower surface.
  10. A device according to claim 9, wherein said lens (4) has a base diameter of between 1 cm and 5 cm.
  11. A device according to one or more of the claims 9-10, wherein said lens (4) has a diameter to height ratio preferably of between 2.5 and 3.5.
  12. A device according to one or more of the preceding claims, wherein said lens is made of crystal.
  13. A device according to one or more of the preceding claims, wherein said LED (4) has an external diameter of between 0.3 mm and 3 mm.
EP09719975.6A 2008-03-13 2009-03-10 Lighting device including a led Active EP2252827B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000429A ITMI20080429A1 (en) 2008-03-13 2008-03-13 INCLUDING LED LIGHTING DEVICE
PCT/IB2009/000473 WO2009112926A2 (en) 2008-03-13 2009-03-10 Lighting device including a led

Publications (2)

Publication Number Publication Date
EP2252827A2 EP2252827A2 (en) 2010-11-24
EP2252827B1 true EP2252827B1 (en) 2016-06-08

Family

ID=40292888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09719975.6A Active EP2252827B1 (en) 2008-03-13 2009-03-10 Lighting device including a led

Country Status (4)

Country Link
EP (1) EP2252827B1 (en)
ES (1) ES2584241T3 (en)
IT (1) ITMI20080429A1 (en)
WO (1) WO2009112926A2 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879068A (en) * 1997-06-03 1999-03-09 Menashrov; Gavriel Illuminated drinking vessel
US6857756B2 (en) * 2001-04-11 2005-02-22 General Manufacturing, Inc. LED work light
US7114834B2 (en) * 2002-09-23 2006-10-03 Matrix Railway Corporation LED lighting apparatus
JP2004296245A (en) * 2003-03-26 2004-10-21 Matsushita Electric Works Ltd Led lamp
JP2004296249A (en) * 2003-03-26 2004-10-21 Matsushita Electric Works Ltd Luminaire
JPWO2006090858A1 (en) * 2005-02-24 2008-07-24 ライトハウステクノロジーズ株式会社 Light emitting device and light emitting material using the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2009112926A3 (en) 2009-11-05
ITMI20080429A1 (en) 2009-09-14
WO2009112926A2 (en) 2009-09-17
EP2252827A2 (en) 2010-11-24
ES2584241T3 (en) 2016-09-26

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