EP3404317A1 - Dispositif d'éclairage et procédé correspondant - Google Patents

Dispositif d'éclairage et procédé correspondant Download PDF

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Publication number
EP3404317A1
EP3404317A1 EP18168004.2A EP18168004A EP3404317A1 EP 3404317 A1 EP3404317 A1 EP 3404317A1 EP 18168004 A EP18168004 A EP 18168004A EP 3404317 A1 EP3404317 A1 EP 3404317A1
Authority
EP
European Patent Office
Prior art keywords
light
cover layer
planar substrate
lighting device
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.)
Granted
Application number
EP18168004.2A
Other languages
German (de)
English (en)
Other versions
EP3404317B1 (fr
Inventor
Alberto ZANOTTO
Simon BOBBO
Lorenzo Baldo
Roberto DIDONE'
Valerio MICHIELAN
Matteo CALDON
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.)
Osram GmbH
Osram SpA
Original Assignee
Osram GmbH
Osram SpA
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 Osram GmbH, Osram SpA filed Critical Osram GmbH
Publication of EP3404317A1 publication Critical patent/EP3404317A1/fr
Application granted granted Critical
Publication of EP3404317B1 publication Critical patent/EP3404317B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • F21V7/0033—Combination of two or more reflectors for a single light source with successive reflections from one reflector to the next or following
    • 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
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68—Details of reflectors forming part of the light source
    • 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
    • F21V15/00—Protecting lighting devices from damage
    • F21V15/01—Housings, e.g. material or assembling of housing parts
    • 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
    • F21V31/00—Gas-tight or water-tight arrangements
    • 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
    • F21V7/05—Optical design plane
    • 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 description relates to lighting devices.
  • One or more embodiments may refer to lighting devices employing electrically powered light radiation sources such as solid-state light radiation sources, e.g. LED sources.
  • a difficulty may be due to the fact that the space available to uniformly diffuse the light emitted by the single emitting elements decreases as the size is reduced; in the case of signs representing letters or numbers (e.g. capital or small alphabetical letters in an illuminated sign) the height may amount to 10-30 cm.
  • the manufacturing process may be different from the solutions chosen for bigger symbols; the latter may include channel-shaped hollow structures wherein there are arranged the light radiation sources.
  • Another approach involves coating with reflective materials the side walls and the surface opposed to the light radiation output surface, so that the light radiation may be "recycled"; the light radiation output surface may be coloured.
  • the light radiation sources themselves, a specific optical solution may not be provided; the light radiation sources are inserted into the hollow portions and the distribution of the emitted light radiation is favoured only by the structure of the sign body: for example, the symbol may implemented with a thickness which makes some space available for diffusing the light radiation, while including reflective materials into the symbol itself.
  • An object of one or more embodiments is contributing to overcome such drawbacks as outlined in the foregoing.
  • said object may be achieved thanks to a lighting device having the features set forth in the claims that follow.
  • One or more embodiments may also refer to a corresponding method.
  • One or more embodiments may be used e.g. to provide a uniform backlighting.
  • One or more embodiments are based on an "umbrella" lighting concept.
  • One or more embodiments may favour manufacturing light engines having such optical and mechanical properties as to be employed for the implementation of a wide range of luminous signs, e.g. luminous symbols such as letters and numbers.
  • the various annexed Figures generally refer to a part or portion of a symbol such as e.g. a letter or a number, this part or portion being represented in cross section, while the symbol may have any shape.
  • the "symbol” (e.g. a letter or a number), which will be generally identified in the following as a lighting device 10, may include a substrate 12 which may have a structure substantially resembling a printed circuit board (PCB).
  • PCB printed circuit board
  • it may be a printed circuit board assembly (PCBA) including a substrate 12 (e.g. of a light colour such as white) hosting one or more electrically powered light radiation sources 14.
  • such sources may be solid-state light radiation sources, e.g. LED sources.
  • PCBA structures as described in the foregoing are known in themselves in the state of the art, which makes it unnecessary to provide a more detailed description herein: this may regard e.g. the provision, on substrate 12, of electrically conductive lines (not visible in the Figures) which are adapted to supply power to the light radiation source (s) 14, and optionally to perform control functions on the same sources.
  • the structure including the substrate 12 and the light radiation source(s) 14 may be coupled to a structure 16 (which may be solid or hollow and which is denoted as "cage” in the following) which is permeable to the light radiation emitted by source(s) 14.
  • One or more embodiments as exemplified herein may include a cover layer 18 of a highly reflective material, and optionally being adapted to allow for a certain light radiation propagation therein, with the structure 16 being interposed between substrate 12 and cover layer 18.
  • the light radiation emitted by the source(s) 14 may propagate through cage 16 (which is light-permeable because it is hollow or because, as schematically shown in the Figures, it includes a light-permeable material, i.e. an at least partially transparent material), impinging onto the cover layer 18 to be reflected backwards, towards the surface of substrate 12 (and optionally slightly propagating outside layer 18, as schematically shown in a dash-dot line at R s ).
  • cage 16 which is light-permeable because it is hollow or because, as schematically shown in the Figures, it includes a light-permeable material, i.e. an at least partially transparent material
  • substrate 12 may be implemented so as to possess in turn light-reflective properties (e.g. because it is made of a light-coloured, e.g. white, material), so that the radiation sent back towards substrate 12 is reflected again towards the cage 16 and the cover layer 18.
  • light-reflective properties e.g. because it is made of a light-coloured, e.g. white, material
  • the cover layer 18 may be arranged centred with respect to axis X14 (e.g. orthogonally to the general extension plane of substrate 12) which identifies the main direction of radiation emission from source(s) 14.
  • Figure 2 exemplifies possible embodiments wherein substrate 12 is not wholly made of a highly reflective material (e.g. of a white material), the reflective behaviour being supported by applying (on the side facing towards cage 16 and cover layer 18) a layer 12a having reflective properties.
  • a highly reflective material e.g. of a white material
  • the layer 12 may include e.g. a highly reflective solder mask, a layer of a highly reflective material such as aluminium, silver, gold, or e.g. a silicone material adapted to be used in potting processes.
  • the relative sizes of substrate 12 and of cage 16 are mutually independent, the possibility being given e.g. of implementing the two components so as to favour a form fitting and thus the assembly of each symbol (e.g. a letter or a number).
  • substrate 12 may be wider than cage 16, so that (see for example Figures 3 and 4 ) the assembly may have the general shape of a mushroom.
  • the assembly may be coupled to a body or casing 20 adapted to form the body or casing of a luminous symbol, e.g. by inserting it into a cavity 20a present in the body or symbol itself, with the head portion of the mushroom-like shape, defined by substrate 12, abutting against the edge of cavity 20a.
  • said assembly of parts may be inserted into opening 20a as a sort of plug adapted to favour sealing, without requiring the provision of a sealing mass.
  • the sealing (having e.g. an IP protection degree) with respect to the edge of cavity 20a may optionally be supported by a sealing mass 22 (e.g. silicone) applied from the back side of substrate 12 opposed to cage 16.
  • a sealing mass 22 e.g. silicone
  • Figure 4 shows a situation wherein, in the presence of said sealing mass (e.g. a potting mass known in itself), generally denoted as 22, the plug effect into cavity 20a may reduce and virtually eliminate the risk of the potting mass 22 accidentally penetrating into cavity 20a.
  • said sealing mass e.g. a potting mass known in itself
  • the cavity 20a receiving the source or each source 14 may have a circular shape; however, this choice is by no means mandatory, being it possible to resort to wholly different shapes (flat, polygonal, etc.).
  • cage 16 may in itself favour the achievement of a protection against the penetration of external agents (e.g. an IP degree protection) in the light engine or at least in the light radiation source 14 and the surrounding area.
  • external agents e.g. an IP degree protection
  • cage 16 may include a body (optionally a hollow body, as already stated in the foregoing) having various light radiation propagation properties (e.g. as regards transparency/opacity/colour) .
  • cage 16 may be coupled to substrate 12 (optionally including layer 12a, if present) by means of different fixation techniques, e.g. by gluing.
  • cage 16 may be obtained by dispensing, onto substrate 12 (once again optionally including layer 12a), a material (e.g. a silicone potting mass) which may be applied in such a way as to encapsulate source (s) 14; the material may subsequently be solidified, e.g. by means of thermal crosslinking and/or photo-crosslinking.
  • a material e.g. a silicone potting mass
  • the cover layer 18 may include a layer of e.g. plastic material, which may be moulded (e.g. co-moulded) with cage 16.
  • layer 18 may include a foil which is applied (e.g. glued) onto cage 16, or a material (e.g. a polymer material such as silicone) which is dispensed onto cage 16, so as to perform a reflective function of the light radiation.
  • a foil which is applied (e.g. glued) onto cage 16
  • a material e.g. a polymer material such as silicone
  • the cover layer 18 may favour the reflection of the radiation emitted by source(s) 14 backwards, towards substrate 12. This may be true e.g. as regards the portion of maximum brightness of the radiation emitted by source(s) 14 along their main axis.
  • Figure 5 shows (of course, by way of example) that the cover layer 18 may be implemented so as not to completely cover the surface of cage 16 towards which layer 18 faces: in this way, a given portion of the light radiation R' R" emitted by source(s) 14 may exit the cage 16 directly at the portions left uncovered by layer 18, as shown at R S in Figure 5 . Moreover, the feature of a lateral exit from cage 16 through walls 16a is preserved, as shown at R L in the same Figure 5 .
  • the shape of the cover layer 18 may be adjusted to the emission features of source (s) 14 (for example to the distribution of the light radiation emission) so as to favour the achievement of particular lighting effect.
  • Figure 6 further exemplifies the possibility of implementing cage 16 with a light-permeable (transparent or translucent) material, such as silicone, polyurethane (deposited e.g. by means of potting techniques) on substrate 12.
  • a light-permeable material such as silicone, polyurethane (deposited e.g. by means of potting techniques) on substrate 12.
  • Said material may also be coupled to substrate 12 as an extruded part, which may then be cut to length and glued onto substrate 12.
  • cage 16 may perform a protective action (e.g. an IP degree protection) of the light engine; for example, with the surface opposed to the source (s) 14, it may act as a support surface for the cover layer 18.
  • a protective action e.g. an IP degree protection
  • the cover layer 18 may be implemented by depositing, onto cage 16 (e.g. by means of potting techniques) a layer of reflective material (e.g. white silicone) or by applying, e.g. by means of gluing, a reflective layer or foil, or by performing a co-extrusion process while manufacturing cage 16.
  • a layer of reflective material e.g. white silicone
  • FIG. 7 exemplifies one or more embodiments, wherein cage 16 may be implemented as a hollow structure (e.g. filled with air) adapted to perform a support action of the cover layer 18 at the periphery thereof.
  • cage 16 may be implemented as a hollow structure (e.g. filled with air) adapted to perform a support action of the cover layer 18 at the periphery thereof.
  • the cage 16 may include light-permeable, e.g. transparent or translucent, material.
  • Figure 7 exemplifies the possibility of fixing the cage 16 onto substrate 12 and layer 18 according to different solutions.
  • an adhesive connection may be implemented at the periphery of substrate 12, and/or a form fitting may be achieved e.g. by means of complementary formations (e.g. projections and/or grooves) as exemplified at 16a and 16b on the right and left of Figure 7 .
  • complementary formations e.g. projections and/or grooves
  • the cover layer 18 may be coupled to the peripheral walls of cage 16 e.g. by means of gluing or by means of co-moulding, or it may be coupled by resorting to various solutions of mechanical coupling.
  • Figure 9 exemplifies that the inner surface of cover layer 18, i.e. the surface 18a facing towards substrate 12, may have a configuration shaped in such a way as to favour the distribution of the light radiation of source(s) 14 laterally of device 10.
  • Figure 8 shows a configuration of the surface 18a (which may be defined as "batwing" configuration) which favours re-directing the light radiation of source (s) 14 towards the side ends 16a of cage 18, while reducing the reflections towards the surface of substrate 12.
  • a lighting device (e.g. 10) according to one or more embodiments may include:
  • the planar substrate may include:
  • the support structure may include:
  • the cover layer may be partially permeable to light (R S ).
  • the device may include a mushroom-like shape, with the planar substrate wider than the support structure and the cover layer.
  • One or more embodiments may include a portion of the support structure left uncovered by the layer, the uncovered portion providing a light emission surface for light from the at least one light radiation source.
  • One or more embodiments may include an outer light-permeable casing (e.g. 20) with at least one cavity (e.g. 20a) having an edge, and with the support structure and the cover layer (18) inserted in said cavity (20a) and the planar substrate (12) abutting against the edge of the cavity (20a).
  • an outer light-permeable casing e.g. 20
  • at least one cavity e.g. 20a
  • the support structure and the cover layer (18) inserted in said cavity (20a) and the planar substrate (12) abutting against the edge of the cavity (20a).
  • One or more embodiments may include an outer light-permeable casing with at least one cavity having an edge, and with the support structure and the cover layer inserted into said cavity and a sealing mass (e.g. 22) sealingly coupling the planar substrate with the edge of the cavity.
  • a sealing mass e.g. 22
  • the at least one light radiation source may include a LED source.

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  • 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)
EP18168004.2A 2017-05-19 2018-04-18 Dispositif d'éclairage et procédé correspondant Active EP3404317B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT201700054764 2017-05-19

Publications (2)

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EP3404317A1 true EP3404317A1 (fr) 2018-11-21
EP3404317B1 EP3404317B1 (fr) 2020-01-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114300603A (zh) * 2021-12-29 2022-04-08 惠州视维新技术有限公司 发光器件及其制备方法、灯板、背光模块以及显示装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001007828A1 (fr) * 1999-07-21 2001-02-01 Teledyne Lighting And Display Products, Inc. Appareil d'eclairage
US20050002194A1 (en) * 2003-03-31 2005-01-06 Citizen Electronics Co., Ltd. Light emitting diode device
US20070138494A1 (en) * 2005-12-19 2007-06-21 Lumileds Lighting U.S., Llc Light-emitting device
US20110018020A1 (en) * 2007-11-20 2011-01-27 Koninklijke Philips Electronics N.V. Side emitting device with wavelength conversion
KR101328073B1 (ko) * 2012-06-28 2013-11-13 서종욱 횡형 발광소자 및 이를 적용하는 발광 시트
US20140126224A1 (en) * 2010-03-03 2014-05-08 LumenFlow Corp. Constrained folded path resonant white light scintillator
US20140354145A1 (en) * 2013-05-29 2014-12-04 Venntis Technologies LLC Volumetric light emitting device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001007828A1 (fr) * 1999-07-21 2001-02-01 Teledyne Lighting And Display Products, Inc. Appareil d'eclairage
US20050002194A1 (en) * 2003-03-31 2005-01-06 Citizen Electronics Co., Ltd. Light emitting diode device
US20070138494A1 (en) * 2005-12-19 2007-06-21 Lumileds Lighting U.S., Llc Light-emitting device
US20110018020A1 (en) * 2007-11-20 2011-01-27 Koninklijke Philips Electronics N.V. Side emitting device with wavelength conversion
US20140126224A1 (en) * 2010-03-03 2014-05-08 LumenFlow Corp. Constrained folded path resonant white light scintillator
KR101328073B1 (ko) * 2012-06-28 2013-11-13 서종욱 횡형 발광소자 및 이를 적용하는 발광 시트
US20140354145A1 (en) * 2013-05-29 2014-12-04 Venntis Technologies LLC Volumetric light emitting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114300603A (zh) * 2021-12-29 2022-04-08 惠州视维新技术有限公司 发光器件及其制备方法、灯板、背光模块以及显示装置

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