WO2016191575A1 - Dispositif d'éclairage, son élément et phare de véhicule - Google Patents

Dispositif d'éclairage, son élément et phare de véhicule Download PDF

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Publication number
WO2016191575A1
WO2016191575A1 PCT/US2016/034377 US2016034377W WO2016191575A1 WO 2016191575 A1 WO2016191575 A1 WO 2016191575A1 US 2016034377 W US2016034377 W US 2016034377W WO 2016191575 A1 WO2016191575 A1 WO 2016191575A1
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WO
WIPO (PCT)
Prior art keywords
flexible circuit
lesd
frame
lighting device
mounting surface
Prior art date
Application number
PCT/US2016/034377
Other languages
English (en)
Inventor
Arokiaraj Jesudoss
Rao Lakshminarasinga Vittapalli
Donato Gonzales CARAIG
Ravi Palaniswamy
Original Assignee
3M Innovative Properties Company
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 3M Innovative Properties Company filed Critical 3M Innovative Properties Company
Publication of WO2016191575A1 publication Critical patent/WO2016191575A1/fr

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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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16—Laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders
    • F21S41/192—Details of lamp holders, terminals or connectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F21S43/195—Details of lamp holders, terminals or connectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/10—Protection of lighting devices

Definitions

  • the present invention generally relates to lighting devices, particularly light emitting semiconductor devices, and vehicle headlamps comprising such devices. Background
  • LESDs Light emitting semiconductor devices
  • LEDs light emitting diodes
  • laser diodes and packages containing LESDs
  • LESDs have found myriad applications in vehicle lighting in recent years, including vehicle headlamps, daytime lighting strips and interior decorative lighting.
  • LESDs offer advantages of low power consumption, no need for an inert atmosphere, higher light intensity per unit energy, shock resistance, longer operating lifetimes, and lower light output degradation over time. Due to these advantages, retrofitting conventional light bulbs with LESDs has become popular with vehicle users.
  • LED bulbs currently comprise arrays of LEDs mounted on conventional rigid circuit board substrates. These are relatively bulky, inflexible structures with conventional soldering of electrical connections beneath the rigid substrates. Limited flexibility exists to control light distribution. Heat extraction features are typically nonexistent, consequently limiting illumination power. [005] It will be desirable to provide a headlamp with increased LESD unit carrying capacity, with an efficient thermal management design as well as increased functionality, such as selective LESD illumination, within a single lighting device.
  • a lighting device for a vehicle headlamp comprising: a single, continuous strip of flexible circuit comprising a plurality of light emitting semiconductor devices (LESDs), a frame supporting the flexible circuit, the frame comprising a plurality of mounting surfaces for mounting the LESDs onto the frame, the flexible circuit having a shape configured to extend over each mounting surface, and the LESDs having a layout on the flexible circuit configured to position one or more LESDs over each mounting surface.
  • LESDs light emitting semiconductor devices
  • a vehicle headlamp comprising a light reflector, a lens fitted over the light reflector, and a lighting device arranged between the light reflector and the lens via an aperture in the light reflector, the lighting device comprising: a single, continuous strip of flexible circuit comprising a plurality of light emitting semiconductor devices (LESDs), a frame supporting the flexible circuit, the frame comprising a plurality of mounting surfaces for mounting the LESDs onto the frame, the flexible circuit having a shape configured to extend over each mounting surface, and the LESDs having a layout on the flexible circuit configured to position one or more LESDs over each mounting surface.
  • LESDs light emitting semiconductor devices
  • a lighting element comprising a single, continuous strip of flexible circuit comprising a plurality of light emitting semiconductor devices (LESDs), the flexible circuit having a shape configured to extend over a plurality of mounting surfaces of a frame, and the LESDs having a layout on the flexible circuit configured to position one or more LESDs over each mounting surface.
  • LESDs light emitting semiconductor devices
  • Fig. 1 shows a perspective view of a lighting device 100.
  • Fig. 2 shows a perspective view of a lighting device 102.
  • Fig. 3 shows a plan view of a lighting device comprising a base.
  • Fig. 4 shows the layout of a flexible circuit used in lighting device 100.
  • Fig. 5 shows a perspective view of a lighting device 200.
  • Fig. 6 shows the layout of a flexible circuit used in lighting device 200.
  • Fig. 7 shows a perspective view of a lighting device 300.
  • Fig. 8 shows the layout of a flexible circuit used in lighting device 300.
  • Fig. 9 shows a plan view of a lighting device 400
  • Fig. 10 shows the light distribution pattern of lighting device 400.
  • Fig. 11 shows a plan view of a lighting device 500.
  • Fig. 12 shows a plan view of a lighting device 600.
  • Fig. 13 shows perspective views of a lighting device 700.
  • Fig. 14 shows a layout of the flexible circuit for lighting device 700.
  • Fig. 15 shows various slope profiles of a mounting surface.
  • Fig. 16A, 16B show the light distribution pattern and corresponding lux values of a low beam from lighting device 700.
  • Fig. 17A, 17B shows the light distribution pattern and corresponding lux values of a high beam from lighting device 700.
  • the figures are not necessarily drawn to scale. However, it will be understood that the use of a numeral to refer to a component in a given figure is not intended to limit the component in another figure labeled with the same number.
  • LES means light emitting semiconductor
  • LESD means light emitting semiconductor device, including light emitting diode (LED) device(s) and laser diode device(s).
  • An LESD may be a bare LES die construction, a complete packaged LES construction, or an intermediate LES construction comprising more than the bare die, but less than all the components for a complete LES package, such that the terms LES and LESD may be used interchangeably and refer to one or all of the different LES constructions.
  • the term “flexible LES device” or “flexible LESD” typically refers to the flexible article containing the bare die light emitting semiconductor, packaged LES construction, or intermediate LES construction.
  • Examples of the type of complete packaged LES constructions that may be suitable for use in embodiments of the present invention include Golden DRAGON LEDs, available from OSRAM Opto Semiconductors GmbH, Germany; LUXION LEDs, available from Philips Lumileds Lighting Company, USA; and XLAMP LEDs, available from Cree, Inc., USA.
  • LESD may refer to a single LESD unit, as well as a row or an array of multiple LESD units.
  • An LESD as referred to herein may be of any voltage rating, exemplary ratings include 6V, 9V, 12V or 24V.
  • LESDs may have a power consumption rating ranging from 1 Watt to 100 Watts or more. Generally it may conform to the nominal power ratings of standard vehicle headlamp bulbs, such as 35 Watts or 55 Watts, or more typically, less than 10 Watts per LESD unit.
  • the present invention provides means to retrofit light bulbs in the headlamps of vehicles using a flexible circuit based LESD lighting device.
  • a flexible circuit based lighting device neatly carries multiple circuit traces, and can be mounted on a heat sink frame to assist in the removal of heat generated during operation.
  • the lighting device in accordance with the invention comprises a single, continuous strip of flexible circuit comprising a plurality of light emitting semiconductor devices (LESDs), and a frame supporting the flexible circuit.
  • the frame comprises a plurality of mounting surfaces for mounting the LESDs onto the frame.
  • the flexible circuit has a shape configured to extend over each mounting surface, and the LESDs have a layout on the flexible circuit configured to position one or more LESDs over each mounting surface.
  • the frame may comprise top, bottom, lateral side and/or front facing mounting surfaces, so these mounting surfaces may be located on different planes.
  • the frame comprises a top mounting surface and a bottom mounting surface relative to a mounted position, the flexible circuit extending over the top mounting surface and the bottom mounting surface, the flexible circuit comprising a first LESD group positioned on the top mounting surface for providing a high beam light source, and a second LESD group is arranged on the bottom mounting surface for providing a low beam light source.
  • the frame comprises a front facing mounting surface relative to a mounted position, the flexible circuit extending over the front facing mounting surface, and the flexible circuit comprising a LESD group positioned on the front facing mounting surface for providing a day time running light (DRL) source.
  • the frame comprises a lateral side mounting surface relative to a mounted position, the flexible circuit extending over the lateral side mounting surface, and the flexible circuit comprising a LESD group positioned on the lateral side mounting surface.
  • FIG. 1 shows a lighting device 100 comprising a frame 120 in the shape of a flat rectangular support member 126 and a base 128 for supporting a single continuous strip of flexible circuit 1 10.
  • Flexible circuit 1 10 is folded and mounted over the frame to extend over top mounting surface 122 and bottom mounting surface 124.
  • flexible circuits may be routed over complex surface geometries, and may be creased or folded to conform to the shape of the frame.
  • a first section 1 12 of the flexible circuit comprises a first LESD group 132 arranged on the top mounting surface 122.
  • a second section 1 14 of the flexible circuit comprises a second LESD group 134 arranged on the bottom mounting surface 124.
  • Each LESD group may herein comprise a single LESD unit, or a plurality of LESD units.
  • LESDs located on a top surface of the frame 120 may advantageously provide a high beam light source, while LESDs located on a bottom surface of the frame may provide a low beam light source.
  • FIG. 2 shows a lighting device 102 wherein the frame 120 is of a similar structure as that in lighting device 100.
  • the flexible circuit 1 1 1 is a single continuous strip of flexible circuit comprising an LESD group 131 arranged on a front facing mounting surface 129 of the frame relative to a mounted position, e.g. in a vehicle.
  • Front facing LESD units may advantageously serve as daytime running lights (DRL).
  • a base is attached to the frame, the base comprising mating features for mounting onto a light bulb socket of a vehicle headlamp assembly. Referring to FIG.
  • the base 128 of the frame 120 may comprise mating features 142 of standard bulb fixtures, such as standards conforming to Group 1, Regulation 37 of the Economic Commission for Europe, European World Forum for Harmonization of Vehicle Regulations. If the lighting device is to be installed in a motorcycle headlamp, the base 128 may correspond to any one of HS 1, HS2, HS5, HS6, S2 or S3 bulbs as defined under Group 1, Regulation 37 of the Economic Commission for Europe, European World Forum for Harmonization of Vehicle Regulations. For installation in cars, the base 128 may comprise mating features corresponding to a HI, H2, H3 or H4 bulb, for example.
  • the flexible circuit may be inserted through a slot located on the base 128 and comprise a connector 150 for connection with electrical driver of a vehicle to power up the LESDs.
  • FIG. 4 shows the configuration of the flexible circuit used in lighting device 100.
  • the flexible circuit 110 comprises a single, continuous substrate with an L-shape configuration. Width of the flexible circuit may be of any suitable size, such as 5 mm, 10 mm or 18mm or 21 mm or more.
  • the flexible circuit is creased at each location where the flexible circuit is to be folded over an edge of the frame.
  • Dotted line 152 represents the portion of the flexible circuit that is folded, or creased, so that the flexible circuit 1 10 is able to fit and conform to the surface geometry of the frame.
  • the layout of LESDs on the flexible circuit is configured to correspond with the LESDs' intended location on the mounting surfaces of the frame. In this case, the layout of the LESDs is configured to position a first and a second LESD (or groups of LESDs, if desired), respectively, on the top and the bottom mounting surfaces of the frame 120.
  • Lighting device 200 comprises a frame 220 in the shape of a hollow rectangular cuboid (base not shown) with an open surface 250 supporting a flexible circuit 210 on three surfaces of the frame 220.
  • a first section 212 of the flexible circuit 210 comprising first LESD 232 is arranged over top surface 222 of the frame, a second section 214 comprising second LESD 234 is arranged over bottom surface 224 of the frame, and a third section 216 comprising third LESD 236 is arranged over front facing surface 226 of the frame.
  • front facing LESD 236 is arranged to emit light in a front facing direction, relative to a mounted position in a vehicle headlamp.
  • FIG. 6 shows the configuration of the flexible circuit used in lighting device 200.
  • the flexible circuit 210 comprises a single, continuous substrate with a straight layout, folded along dotted lines 252, 253.
  • the layout of the LESDs is configured to position a first, second and a third LESD (or groups of LESDs, if desired), respectively, on the top, front facing and the bottom mounting surfaces of the frame 220.
  • FIG. 7 shows another embodiment of the lighting device according to the invention.
  • Lighting device 300 comprises a frame 320 in the shape of a solid rectangular cuboid (base not shown) supporting a flexible circuit 310 and having five LESDs arranged on five mounting surfaces of the frame.
  • a first LESD 332 is arranged over top surface 322
  • a second LESD 334 is arranged over bottom surface 324
  • a third LESD 336 is arranged over front facing surface 326.
  • the frame also comprises a lateral side mounting surface relative to a mounted position, and a LESD group is arranged on the lateral side mounting surface.
  • a fourth and a fifth LESD 337, 338 are provided on surfaces 327, 328, which are on the lateral sides of the frame.
  • the lateral side mounted LESDs 337, 338 are arranged to emit light in a right and left direction, respectively, relative to a mounted position from a vehicle driver's perspective.
  • these LESDs may be illuminated as high beam light source in conjunction with the first LESD 332, thereby increasing high beam light intensity.
  • LESDs 337, 338 may comprise amber light emitting LESDs to serve as left/right directional lights, or as hazard lights, for example.
  • FIG. 8 shows the configuration of the flexible circuit 310 used in lighting device 300.
  • the flexible circuit 310 comprises a single, continuous substrate with a cross-shaped configuration, folded in sections along dotted lines 352 to 355.
  • the layout of the LESDs is configured to position a first, second, third and fourth LESD (or groups of LESDs, if desired), respectively, on the top, front facing, bottom and lateral side mounting surfaces of the frame 320.
  • each LESD group present on the flexible circuit may be comprised in independent, separate circuit traces in the flexible circuit so that each LESD group is independently operable from other LESD groups. In one embodiment, this enables switching on and off of high beam, low beam and DRL light sources, and combinations thereof.
  • any type of LESD that can be formed on a flexible circuit may be used. These include any variety of conventional red, orange, yellow, green, blue, violet, purple, UV or white LEDs based on semiconductor materials such as yellow phosphor, zinc selenide, indium gallium nitride, gallium arsenide, gallium nitride.
  • LESDs such as those described in WO20121 12310 Al and WO2012061 183 Al may be used in the present invention.
  • white, orange (590 ⁇ ⁇ ⁇ 610) or yellow (570 ⁇ ⁇ ⁇ 590) LESDs are preferred for standard vehicle use.
  • the performance of the LESDs is dependent on its operating temperature; a given diode will produce more light at a low temperature than at a high temperature.
  • the temperature of an LESD must be kept relatively low and stable.
  • the frame may be a heat sink. Cooling fins may be incorporated on the surface of the frame to aid in convective heat transfer with the air around the frame, or alternatively, cooling fins may be incorporated on the base.
  • a thermally conductive interface tape e.g.
  • 3MTM range of Thermally Conductive Adhesive, Transfer or Interface Tapes may be provided between the flexible circuit and the frame, or more specifically, between each section of the flexible circuit comprising an LESD and the mounting surface of the frame on which the LESD is extended.
  • the frame itself may comprise a thermally conductive material to conduct heat from the LESDs, such as a metal e.g. aluminum or stainless steel wherein thermal conductivity ranges from 15W/mK to 100 W/mK; or a thermally conductive polymer, e.g. organic polymer composites such as polyamides, polypheny lene sulfides that include heat-conductive additives e.g.
  • the frame and the base are integrally formed.
  • the base may also incorporate active or passive cooling devices, such as cooling fins, or an electric fan, or a liquid coolant provided in a liquid jacket, to draw heat away from the frame during operation.
  • active or passive cooling devices such as cooling fins, or an electric fan, or a liquid coolant provided in a liquid jacket, to draw heat away from the frame during operation.
  • FIG. 9 depicts a lighting device 400 comprising flexible circuit 420 supported by a circular frame 410 comprising base 440.
  • LESD 432 Relative to a mounted position, LESD 432 is arranged on a curved, front facing mounting surface of the frame.
  • LESDs 437, 438 are arranged on the lateral side facing mounting surfaces frame.
  • frame 420 comprises a circular structure with cooling fins 451 extending from a central hub 452 connecting to the inner surface of the frame.
  • FIG. 10 is a photograph showing the light distribution across a white wall. The measured light intensity levels are shown in Table 1 :
  • FIG. 11 depicts lighting device 500 comprising a complex structure frame.
  • lighting device flexible circuit 520 is supported by a frame 510.
  • LESD 532 is arranged on a top mounting surface of the frame
  • LESD 534 is arranged on a bottom mounting surface of the frame.
  • the top and bottom mounting surfaces are located on an elongated support member 541 of the frame which is connected to and extending from base 540.
  • a circular member 550 provides a curved front facing mounting surface over which LESD 536 is arranged.
  • Cooling fins 552 extend from a central hub 551, and connects to the inner surface of the frame.
  • FIG. 12 depicts a lighting device 600 comprising a complex structure frame 610 comprising a front facing semi -circular member 611 which is connected to a central member 612, and rear sleeves 613 connecting the central member to the base 640.
  • Flexible circuit 620 is supported by the frame 610. Relative to a mounted position, LESD 632 is arranged on a top mounting surface of the frame, LESD 634 is arranged on a bottom mounting surface of the frame, and LESD 636 is arranged on a front facing surface of the frame. LESD 637, 638 are arranged on a lateral side facing mounting surface of the frame.
  • the flexible circuit 620 is routed from LESD 636 to LESD 632 to LESD 638 to LESD 634 and finally to LESD 637, and to the base 640.
  • FIG. 13 show perspective bottom and top views, respectively, of yet another embodiment of a lighting device 700.
  • Lighting device 700 comprises a frame 710 having front facing mounting surface 712, lateral side mounting surface 714, and top 718 and bottom 716 mounting surfaces.
  • top mounting surface 718 is recessed, so that light from LESD 732 is not visible to an oncoming vehicle user.
  • FIG. 14 shows the layout of the flexible circuit 720 with four LESD groups 730 positioned at various locations on the flexible circuit, and a connector 780 located at an edge.
  • mounting surfaces of the frame may provide the desired angle at which light emits from each LESD. Since LESD units are planar structures, light emits in a direction orthogonal to the plane of the surface on which an LESD is placed. For example, a mounting surface comprising a horizontally flat surface will enable an LESD to emit light vertically upwards when mounted in a vehicle. Light incident on any surface of the light reflector is reflected and eventually exits along the optical axis of the light reflector. Mounting surfaces of the frame of the lighting device may be modified to achieve the required light distribution characteristics. In order to avoid dazzling oncoming vehicle users, the mounting surface may be recessed so that the LESD is obscured from direct view, and hence avoids direct emission of light.
  • the mounting surface comprises a backward sloping profile, i.e. slope angled towards the base of the light reflector in a headlamp as opposed to facing towards the direction of travel.
  • a backward sloping profile i.e. slope angled towards the base of the light reflector in a headlamp as opposed to facing towards the direction of travel.
  • An appropriate sloping profile also helps to direct the reflected light at desired angle of projection, e.g. either raising or lowering the angle of projection.
  • At least one of the top, bottom or lateral side mounting surfaces may comprise a slope profile. As shown in FIG.
  • a mounting surface comprising a slope profile may be selected from a fixed-angle slope profile 801, or a varying -angle slope profile such as a convex slope profile 802, or a concave slope profile 803, or a step-wise slope profile 804.
  • a fixed slope profile having a fixed angle calculated to work with the known geometry and light distribution behavior of a light reflector may be adopted in design-in situations.
  • Aftermarket devices may adopt varying slope profiles so that LESDs positions on the mounting surface may be adjusted according to the reflector geometry of the vehicle to achieve a desired light distribution pattern.
  • a recessed indentation or protrusion with a sloping profile formed on the surface of a flat mounting surface may also provide these various slope profiles.
  • a test plane comprises a flat vertical screen placed at a distance of 25 meters forward of the lighting device. Such a test plane was adopted to study the illumination pattern produced by lighting device 700.
  • Fig 16A is a light distribution pattern of a low beam illumination on the test plane. In this pattern, a clear top cut-off line is seen, which is required in ECE Rl 13.
  • Fig 16B a table of lux values of each test point is shown.
  • the second and the third column is the required lux value according to ECE Rl 13.
  • Ray tracing simulation results show that the lux values of most test points meet the standard in ECE R113 (the green cell means the corresponding lux value meet the standard and the red cell means fail to meet the standard).
  • Fig. 17A and Fig. 17B show, respectively, the illumination pattern and table of lux values for a high beam. The simulation result shows that all test points meet the standard for high beam illumination.
  • the lighting device may incorporate features to provide an asymmetrical light distribution pattern.
  • LESD units may be provided on a sloping profile on the left side of the frame (from the driver's perspective) facing away from oncoming traffic, hence shielding direct light from the LESD units from oncoming drivers.
  • LESD units may be provided on a sloping profile on the right side of the frame facing away from oncoming traffic, hence shielding direct light from the LESD units from oncoming drivers.
  • colors for aesthetic purposes. Examples include various red, green, blue, or amber lights (e.g. for hazard lights).
  • vibration damping tape is provided on the portions of the base contacting the light bulb socket of the vehicle headlamp. Vibrational stability of the lighting device when mounted on a moving vehicle may be achieved by providing a precut vibration damping material on the base of the frame, which interfaces with the headlamp socket. When the lighting device is locked in position, the vibration damping material may help to minimize impacts that can lead to the dislodgment of the lighting device. Examples of usable vibration dampening materials include 3MTM Vibration Damping Tapes, which comprises pressure-sensitive viscoelastic polymers and aluminum foil constraining layer to effectively convert vibrational energy to negligible heat in order to reduce vibrational noise and decrease wear and tear on parts.
  • 3MTM Vibration Damping Tapes which comprises pressure-sensitive viscoelastic polymers and aluminum foil constraining layer to effectively convert vibrational energy to negligible heat in order to reduce vibrational noise and decrease wear and tear on parts.
  • the invention is directed to a lighting element, comprising a single, continuous strip of flexible circuit comprising a plurality of light emitting semiconductor devices (LESDs), the flexible circuit having a shape configured to extend over a plurality of mounting surfaces of a frame, and the LESDs having a layout on the flexible circuit configured to position one or more LESDs over each mounting surface of the frame.
  • a first section of the flexible circuit comprises a first LESD group formed at a position on the flexible circuit corresponding to the upper mounting surface on the component
  • a second section of the flexible circuit comprises a second LESD formed at a position on the flexible circuit corresponding to the lower mounting surface on the component.
  • a section of the flexible circuit comprises a LESD group formed at a position on the flexible circuit corresponding to the location of a front-facing mounting surface on the frame.
  • a section of the flexible circuit comprises a LESD group formed at a position on the flexible circuit corresponding to the location of a lateral side surface on the frame.
  • Each LESD group may be electrically connected to a separate circuit trace in the flexible circuit so that each LESD group is independently operable from other LESD groups.
  • a thermally conductive interface tape may be provided on a surface of the flexible circuit opposite the surface on which the LESDs are formed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un dispositif d'éclairage pour un phare de véhicule, comprenant : une seule bande continue de circuit flexible comprenant une pluralité de dispositifs à semi-conducteur électroluminescents (LESD), un cadre supportant le circuit flexible, le cadre comprenant une pluralité de surfaces de montage pour monter les LESD sur le cadre, le circuit flexible ayant une forme configurée pour s'étendre au-dessus de chaque surface de montage, et les LESD ayant une disposition sur le circuit flexible configurée pour positionner un ou plusieurs LESD sur chaque surface de montage.
PCT/US2016/034377 2015-05-27 2016-05-26 Dispositif d'éclairage, son élément et phare de véhicule WO2016191575A1 (fr)

Applications Claiming Priority (2)

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SG10201504177QA SG10201504177QA (en) 2015-05-27 2015-05-27 Lighting device, element thereof and a vehicle headlamp
SG10201504177Q 2015-05-27

Publications (1)

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WO2016191575A1 true WO2016191575A1 (fr) 2016-12-01

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Cited By (2)

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CN108613099A (zh) * 2016-12-16 2018-10-02 市光法雷奥（佛山）汽车照明系统有限公司 用于机动车辆的多功能发光装置
EP3869089A4 (fr) * 2018-10-16 2021-10-13 Koito Manufacturing Co., Ltd. Dispositif de véhicule

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US20050237760A1 (en) * 2004-04-22 2005-10-27 Koito Manufacturing Co., Ltd. Vehicular lamp
US20060193130A1 (en) * 2005-02-28 2006-08-31 Kazuo Ishibashi LED lighting system
US20060256557A1 (en) * 2005-05-02 2006-11-16 Citizen Electronics Co., Ltd. LED illumination lamp device
CN201589090U (zh) * 2009-10-28 2010-09-22 李秋浦 一种led球泡灯
US20110051448A1 (en) * 2009-09-03 2011-03-03 Ryotaro Owada Vehicle headlight
US20120176035A1 (en) * 2009-09-23 2012-07-12 Alloway Michael J Lighting assembly
CN103486554A (zh) * 2012-06-08 2014-01-01 株式会社小糸制作所 光源单元
CN203464123U (zh) * 2013-08-22 2014-03-05 江苏富新电子照明科技有限公司 一种汽车昼间行车灯结构

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US20050237760A1 (en) * 2004-04-22 2005-10-27 Koito Manufacturing Co., Ltd. Vehicular lamp
US20060193130A1 (en) * 2005-02-28 2006-08-31 Kazuo Ishibashi LED lighting system
US20060256557A1 (en) * 2005-05-02 2006-11-16 Citizen Electronics Co., Ltd. LED illumination lamp device
US20110051448A1 (en) * 2009-09-03 2011-03-03 Ryotaro Owada Vehicle headlight
US20120176035A1 (en) * 2009-09-23 2012-07-12 Alloway Michael J Lighting assembly
CN201589090U (zh) * 2009-10-28 2010-09-22 李秋浦 一种led球泡灯
CN103486554A (zh) * 2012-06-08 2014-01-01 株式会社小糸制作所 光源单元
CN203464123U (zh) * 2013-08-22 2014-03-05 江苏富新电子照明科技有限公司 一种汽车昼间行车灯结构

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108613099A (zh) * 2016-12-16 2018-10-02 市光法雷奥（佛山）汽车照明系统有限公司 用于机动车辆的多功能发光装置
CN108613099B (zh) * 2016-12-16 2024-02-23 市光法雷奥（佛山）汽车照明系统有限公司 用于机动车辆的多功能发光装置
EP3869089A4 (fr) * 2018-10-16 2021-10-13 Koito Manufacturing Co., Ltd. Dispositif de véhicule
US11511661B2 (en) 2018-10-16 2022-11-29 Koito Manufacturing Co., Ltd. Vehicular apparatus

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