WO2007040527A1 - Systeme d’eclairage utilisant une pluralite de diodes lumineuses - Google Patents

Systeme d’eclairage utilisant une pluralite de diodes lumineuses Download PDF

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Publication number
WO2007040527A1
WO2007040527A1 PCT/US2005/035274 US2005035274W WO2007040527A1 WO 2007040527 A1 WO2007040527 A1 WO 2007040527A1 US 2005035274 W US2005035274 W US 2005035274W WO 2007040527 A1 WO2007040527 A1 WO 2007040527A1
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WIPO (PCT)
Prior art keywords
recited
reflector
led
illumination
axis
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PCT/US2005/035274
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English (en)
Inventor
Simon Magarill
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3M Innovative Properties Company
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Priority to PCT/US2005/035274 priority Critical patent/WO2007040527A1/fr
Publication of WO2007040527A1 publication Critical patent/WO2007040527A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • 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
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • 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]
    • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching 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
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • F21S10/06—Lighting devices or systems producing a varying lighting effect flashing, e.g. with rotating reflector or 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
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
    • 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
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • 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 invention relates to optical systems, and more particularly to an illumination system, for example a vehicle headlight, that uses a number of light emitting diodes as the sources of light.
  • LEDs Light emitting diodes
  • the light is emitted from an LED over a wide range of angles via the combination of carriers at the junction.
  • the large emission angle for the LED light introduces system design issues related to collecting and directing the light when the LED is used as a light source.
  • the small size, long life and high optical efficiency typically in excess of 50% of electrical energy converted to optical energy, make the LED attractive as a light source for directed illumination systems, such as vehicle headlights. There is a need, therefore, for an approach to collecting and directing LED light with high efficiency while maintaining small size and low cost.
  • One exemplary embodiment of the present invention is directed to an illumination system that has at least first and second illumination modules arranged substantially side by side along a first direction, forming a first row.
  • At least the first illumination module includes a first light emitting diode (LED) arranged to emit light generally along a first LED axis so as to illuminate a first curved reflector having a first reflector axis non-parallel to the first LED axis.
  • the first curved reflector has a first reflecting surface that, at an output from the first illumination module, subtends an angle of less than 180° at the first reflector axis.
  • Another exemplary embodiment of the present invention is directed to an illumination system that has at least first and second illumination modules arranged substantially side by side along a first direction, in a first row of illumination modules.
  • the first and second illumination modules each include a respective light emitting diode (LED) arranged to emit light generally along a respective LED axis so as to side-illuminate a respective curved reflector having a respective reflector axis non-parallel to the respective LED axis.
  • the reflector axis of the first illumination module is non-parallel to the reflector axis of the second illumination module.
  • Another exemplary embodiment of the present invention is directed to a lamp unit that includes a molded transparent body defining at least first and second curved surfaces disposed sequentially along a first row in a first direction.
  • the at least first and second curved surfaces are provided with at least first and second respectively conforming reflecting layers.
  • the at least first and second curved surfaces define at least first and second respective reflector axes.
  • At least first and second light emitting diodes (LEDs) are disposed to emit light generally along respective at least first and second LED axes oriented non-parallel to the first direction and non-parallel to respective reflector axes, so as to illuminate respectively the at least first and second reflective layers.
  • FIG. 1A shows a schematic perspective view of an exemplary embodiment of an illumination module according to principles of the present invention
  • FIGs. 1 B-1 D show schematic cross-section views of an exemplary embodiment of an illumination module according to principles of the present invention
  • FIG. 1 E schematically illustrates a cross-sectional view of another exemplary embodiment of an illumination module according to principles of the present invention
  • FIGs. 2 and 3 show schematic cross-section views of exemplary embodiments of illumination modules having curved output surfaces, according to principles of the present invention
  • FIG. 4 shows a schematic cross-section view of an exemplary embodiment of an illumination module having a faceted output surface, according to principles of the present invention
  • FIGs. 5A and 5B schematically illustrate exemplary embodiments of illumination systems formed from pluralities of illumination modules, according to principles of the present invention
  • FIG. 5C schematically illustrates an exemplary embodiment of an illumination system formed from illumination modules with at least one non- parallel reflector axis, according to principles of the present invention
  • FIG. 6A shows a schematic perspective view of an exemplary embodiment of an illumination module according to principles of the present invention
  • FIG. 6B presents a graph showing the calculated depth of an illumination module as a function of output aperture size, for various values of paraboloid radius
  • FIG. 6C presents a graph showing the calculated collection efficiency of an illumination module as a function of output aperture size, for various values of paraboloid radius
  • FIGs. 7A and 7B schematically illustrate exemplary embodiments of illumination systems formed using sub-units of illumination modules, according to principles of the present invention
  • FIG. 8A schematically illustrates an exemplary embodiment of an illumination module used in the description of Example 1
  • FIG. 8B schematically illustrates a sub-unit formed using illumination modules as shown in FIG. 8A and used in the description of Example 1 ;
  • FIGs. 8C-8E present calculated illumination patterns produced by the sub- unit illustrated in FIG. 8B;
  • FIG. 9A schematically illustrates an exemplary embodiment of an illumination module used in the description of Example 2;
  • FIG. 9B schematically illustrates a sub-unit formed using illumination modules as shown in FIG. 9A and used in the description of Example 2;
  • FIG. 9C presents a calculated illumination pattern produced by the sub-unit illustrated in FIG. 9B.
  • the present invention is applicable to optical systems and is more particularly applicable to light collection and management systems useful for illuminating a target with light from one or more light emitting diodes (LEDs).
  • LEDs light emitting diodes
  • LEDs with higher output power are becoming more available, which opens up new applications for LED illumination.
  • Some applications that may be addressed with high power LEDs include their use as light sources in projection and display systems, as illumination sources in machine vision systems and camera/video applications, and also in distance illumination systems such as vehicle headlights.
  • the term LED is used to refer to a light emitting diode that may or may not be closely coupled with a lens.
  • the light emitting diode may be simply an LED die, or may include some other configuration, for example an LED die encapsulated within a lens.
  • the reflecting surface 110 may be, for example, formed by multiple polymer layers whose thicknesses are selected to provide a desired degree of reflectivity. In other examples, the reflecting surface 110 may be metalized, or may be coated with a stack of inorganic dielectric coatings.
  • the reflector 104 may include a transparent body 116 disposed between the LED 102 and the reflecting surface 110.
  • the transparent body 116 may be formed from any suitable transparent material, for example, from a polymer such as polycarbonate, cyclic olefin copolymers (COC), such as copolymers of ethylene and norbornene, polymethyl methacrylate (PMMA), or the like.
  • the transparent body 116 may be molded into shape or formed using some other method.
  • the reflecting surface 110 may be formed over an outside surface of the transparent body 116. Light 106 from the LED 102 is reflected at the reflecting surface 110 and the reflected light 114 passes through an output surface 122 of the illumination module 100.
  • the reflector 104 may be formed with the reflecting surface 110 disposed on the inner surface of a curved substrate so that the reflecting surface 110 lies between the substrate and the LED 102. Such a reflector may be referred to as a hollow reflector.
  • the transparent body 116 may be provided with a concave surface 120 concentric to the location of the LED emitting area 102a and the LED lens 102b may be secured in this concave surface, for example using optical cement. This arrangement is convenient because the interface between the lens 102b and the transparent body 116 may then be at least partially index matched, thus reducing refractive effects and reducing reflective losses.
  • the lens 102b may refract reflected ray 114a into a direction away from the desired direction. Accordingly, there may be an increase in the amount of light reaching the target area when a reflector having a transparent body 116 is used.
  • the output surface 122 of the transparent body 116 may provide a refracting surface used to control the direction of the reflected light 114. This gives the designer another degree of freedom to control the direction of the light exiting from the illumination module 100.
  • the surface 122 is flat and is substantially perpendicular to the reflector axis 112. It will be appreciated that a flat output surface 122 need not be perpendicular to the reflector axis 112 and that the angle between the output surface 122 and the reflector axis 112 may have some angle other than 90°.
  • the output surface need not be flat.
  • the output surface 222 may be curved, for example as illustrated in FIG. 2.
  • the curved output surface 222 acts as a lens and, in an exemplary embodiment, may act as a positive lens so as to add focusing power to the focusing power of the reflecting surface 110, thus focusing the light 214 exiting from the illumination unit.
  • the curved output surface 222 may act as a negative lens so as to subtract focusing power from the focusing power of the reflecting surface 110. It will be appreciated that the curved output surface 222 need not be curved over its entire area, and that the output surface 222 may have a portion that is flat and a portion that is curved.
  • the output surface 422 may be faceted, for example as illustrated in FIG. 4.
  • the faceted output surface 422 may include two or more facets 422a and 422b so as to refract different reflected rays 414a and 414b in different directions.
  • the reflector 104 is truncated in the x- direction, and so the reflecting surface 110 may subtend an angle of less than 180° at the reflector axis 112 at the output of the reflector unit 104.
  • FIG. 1 D shows a cross-section of the illumination module 100 looking along the reflector axis 112.
  • FIG. 1C shows the plane of the view in FIG. 1 D as the section 1 D-1 D.
  • the angle subtended by the reflecting surface 110 at the reflector axis 112 is shown as angle ⁇ .
  • Section 1 D-1 D is at the output end of the illumination module 100, and so the angle ⁇ is the angle subtended by the reflecting surface 110, at the output of the illumination module 100, at the reflector axis 112.
  • the value of ⁇ depends on the extent by which the reflecting surface 110 is truncated in the x-direction.
  • the truncation surfaces 150 and 152 represent the lateral extent (in the +x and -x direction) of the reflector 104, and need not represent physical surfaces in a module.
  • the value of ⁇ increases as the truncation surfaces 150 and 152 are made more distant from the reflector axis 112, at least up to a value of 180°. In the exemplary embodiment illustrated in FIG.
  • the value of ⁇ is higher than that for the embodiment illustrated in FIG. 1 D, since r2 is greater than r1.
  • the value of ⁇ is less than 180°, and may be less than 120°, 90°, or 60°.
  • the truncation surfaces 150 and 152 may be planar and may be parallel to each other. In other exemplary embodiments, the truncation surfaces 150 and 152 may not be parallel to each other, or may not be planar. In addition, in some exemplary embodiments, the truncation surfaces 150 and 152 may be, but are not required to be, parallel to a plane defined by the reflector axis 112 and the LED axis 108, i.e.
  • a number of illumination modules may be packaged together to form an illumination system.
  • One design criterion that is often important when packaging a number of light sources together is to reduce the overall size of the multi-source package while maintaining high efficiency of illumination into a particular angular aperture.
  • An illumination system that includes a number of illumination modules provides some flexibility in reducing the package size while efficiently directing light into a desired angular aperture. Furthermore, the integration of multiple illumination modules into a single body reduces the part count, thus reducing part and assembly costs.
  • FIG. 5A schematically illustrates an exemplary embodiment of an illumination system 500 that has two rows, each row having four illumination modules 502.
  • the output from the illumination system 500 therefore, combines the output from each of the eight illumination modules 502.
  • the modules 502 in the upper row are oriented differently from the modules 502 in the lower row. In some configurations this may provide for easier access to the LEDs for maintenance.
  • an illumination system 520 comprises modules 522 in two rows with the same orientation. It will be appreciated that an illumination system may have a different number of illumination modules in a row, and may also have a different number of rows of illumination modules.
  • the illumination modules 502 and 522 are shown with cylindrically curved output surfaces, thereby spreading the light in the x-z plane.
  • Another approach to increasing the spread of light in the x-z plane is to arrange the illumination modules so that their respective reflector axes are not parallel.
  • FIG. 5C shows an illumination system 540 having four illumination modules 542a-542d, along with their respective reflector axes 544a-544d. The reflector axes 544a-544d are not parallel, and so the light is spread in the x-z plane.
  • the divergence of the combined output from all the illumination modules is approximately 10°.
  • the reflector axes are not parallel, then the divergence of the combined output beam may be greater than 10°.
  • the illumination systems may be manufactured with the modules molded together as a single unit or sub-unit.
  • a single body may be molded with the transparent bodies of a number of illumination modules.
  • the reflecting surfaces may then be formed by providing a mirror coating, a reflecting coating, or a reflecting film on certain surfaces of the molded body.
  • the illumination module 600 has an LED 602 that illuminates a reflector 604. Light from the reflector 604 exits through the output 606 of the illumination module 600.
  • the output 606 corresponds to an output surface of the reflector 604 or, where the reflector 604 is a hollow reflector, a plane perpendicular to the reflector axis that intersects the portion of the reflecting surface farthest from the LED.
  • the depth, d, of the illumination module 600 is defined as the distance from the apex of the reflector 604 to the output 606, in the z-direction.
  • the width, w, of the module 600 is the width of the output 606 in the x-direction and the height, h, is the height of the module 600 at the output 606 in the y-direction.
  • z (cy 2 )/(1 +(1 -(1 +k)c 2 y 2 ) 1/2 ).
  • y is the value of the surface co-ordinate along the y-axis
  • k is the conic constant.
  • the dimension CA (clear aperture) is equal to both w and h.
  • the calculation was performed for paraboloidal surfaces having three different values of R, viz. 8 mm, 9 mm and 10 mm.
  • the results of the calculation show that the depth of the module increases with the size of the aperture. Also, for a given aperture size, the depth is greater for a smaller value of R.
  • FIG. 6C shows the geometrical collection efficiency as a function of the aperture size, CA, for the three different values of R.
  • the geometrical collection efficiency is the fraction of light emitted from the LED that exits through the output aperture of the illumination module and within a specified angular aperture.
  • the angular aperture was assumed to be ⁇ 5° in the vertical direction (in the y-direction) and ⁇ 35° in the horizontal direction (x- direction).
  • the collection efficiency was calculated strictly as a geometrical parameter, and did not take into account Fresnel reflection, absorption or any other losses.
  • the collection efficiency depends on the size and shape of the reflector. The collection efficiency increases with increased size of the output aperture, and also increases with smaller values of R.
  • the angle, ⁇ , subtended by the reflecting surface at the reflector axis is about 53.2°, and thus it can be seen that the collection efficiency of the illumination module can be high even when significant truncation takes place. If the value of ⁇ is 180° or higher, then the width of the illumination module is maximized, and so limits the density with which the modules can be packed.
  • the calculations illustrated in FIG. 6C shows that the illumination modules can be truncated, which permits closer module packing, without significant reduction in the geometric collection efficiency. This results in a higher output of light per unit area from the illumination system than would otherwise be possible where the value of ⁇ is 180° or greater.
  • An illumination system that uses illumination modules as disclosed herein may employ a number of identical illumination modules or may employ illumination modules having different characteristics of, for example, brightness and divergence.
  • Some exemplary embodiments of an illumination system may employ a number of a first type of illumination modules, having a first set of illumination characteristics, and a number of a second type of illumination modules, having a second set of illumination characteristics.
  • One particular exemplary embodiment of an illumination system 700 employs four sub-units 702a-702d. Each sub-unit 702a-702d contains a number of respective illumination modules 704a- 704d. Each type of illumination module 704a-704d may have its own individual illumination characteristics.
  • each sub- unit 702a-702d includes two rows of illumination modules 704a-704d, and four illumination modules 704a-704d in each row. It will be appreciated that each sub- unit 702a-702d may have a different number of respective illumination modules in each row, and/or a different number of rows. Furthermore, in the illustrated exemplary embodiment, the sub-units 702a-702d are stacked to form two rows, each row having two sub-units. The sub-units 702a-702d may be arranged differently, for example, arranged in a single row as schematically illustrated for the illumination system 720 in FIG. 7B. Furthermore, the illumination system may include a different number of sub-units, may stack a different number of sub-units in a row, and/or have a different number of rows. Arrangements of illumination modules, such as those shown in FIGs. 7A or
  • a headlight 7B may find use in lighting applications, for example, automobile headlights.
  • Some considerations for LED-based automobile headlights suggest the use of a number of different overlapping illumination beams in a headlight to achieve a desirable overall illumination effect.
  • the different beams are typically obtained from different sub-units containing multiple illumination modules.
  • a headlight has four different sub-units that produce four different illumination beams, whose characteristics are summarized in Table I. Table I: Summary of Beam Characteristics for Sample Headlight
  • Beam 1 is a bright spot beam, with a relatively small divergence, that illuminates the center field of view.
  • Beam 2 is a wide angle, bright beam, while Beam 3 is a mid-divergence, bright beam.
  • Beam 4 gives wide angle, relatively near-field coverage, and is particularly useful when the vehicle is turning a corner. Not all the illumination modules of beam 4 need be used simultaneously. For example, those illumination modules that point to the left may be operated when the vehicle turns to the left and those modules that point to the right may be used when the vehicle turns to the right.
  • the angle through which the vehicle is turned may control which particular illumination modules are operated.
  • some or all of the illumination modules in the sub-unit may be physically turned in the direction in which the vehicle is turning.
  • the following two examples illustrate details for the sub-units used for producing beams 1 and 2.
  • the LED used in the illumination modules was assumed to be a Luxeon LXHL-PW09 type white-light emitting LED, produced by Lumileds Lighting LLC, San Jose, California. This LED produces 80 lumens of white light, having a Lambertian radiation pattern, from an emitting surface 0.95 mm x 0.95 mm.
  • Example 1 An exemplary embodiment of an illumination module 800 used in a sub- unit to generate beam 1 is schematically illustrated in FIG. 8A.
  • the module 800 includes an LED 802, a paraboloidal reflector 804, and an output surface 806.
  • the output surface 806 of the module 800 is flat.
  • the desired angular aperture from the sub-unit is ⁇ 2° vertically and ⁇ 5° horizontally. Accordingly, the amount of light, P, generated by a single illumination module into this angular aperture can be calculated as:
  • Po is the amount of light output from the LED
  • CE is the geometrical light collection efficiency
  • L1 is reflectivity of the reflector
  • L2 is the transmission through the output surface of the module.
  • the value of CE, for this particular angular aperture can be calculated to be 42.1 %.
  • the value of L1 the reflectivity of the reflector is assumed to be 0.99. If the output surface of the module is uncoated, then there is a Fresnel reflection loss at the output surface, and so L2 is assumed to be 0.96.
  • the value of P for a single illumination module may be calculated using equation (1 ) to be 32 Lumens.
  • FIG. 8C shows the output over an angular aperture of ⁇ 5° by ⁇ 5°.
  • the LEDs were assumed to be displaced from the focus of their respective paraboloidal reflectors by 200 ⁇ m towards the apex of the paraboloid. This displacement has the effect of reducing the amount of light that is directed in the upward direction, hence the upper portion of FIG. 8C is relatively dark. This effect may be useful in vehicle headlight systems, since the light is directed less into the sky and more towards the road. The effect is even more pronounced when the LEDs were assumed to be displaced 400 ⁇ m from the focus towards the apex of the paraboloid, as shown in FIG. 8D.
  • FIG. 8E shows the calculated illumination into an angular aperture of ⁇ 2° by ⁇ 5°, where the LEDs were assumed to be displaced from the respective foci by 400 ⁇ m.
  • FIG. 9A An exemplary embodiment of an illumination module 900 used in a sub- unit to generate beam 2 is schematically illustrated in FIG. 9A.
  • the module 900 includes an LED 902, a paraboloidal reflector 904, and an output surface 906.
  • the output surface 906 is square with a height and width, h and w, equal to 20 mm.
  • the output surface 906 of the module 900 has a cylindrical surface with a radius of curvature equal to 19 mm.
  • the use of a curved output surface 906 may increase the spread of light in the horizontal direction.
  • the desired angular aperture from the sub-unit is +5° vertically and ⁇ 35° horizontally.
  • the geometrical collection efficiency, CE, into this angular aperture can be obtained from FIG. 6C as about 79%.
  • the amount of light, P, generated by a single illumination module into this angular aperture can be calculated using expression (1 ) as 60.1 Lumens, where the values of L1 and L2 are as given in Example 1. Therefore, a sub-unit 920 with fourteen such illumination modules 900 can be calculated to provide 841.4 Lumens, which meets the output power requirements for beam 2.
  • the horizontal divergence from a single illumination module 900 may be less than ⁇ 35°, however, so the modules 900 in the sub-unit 920 may be arranged with non-parallel reflector axes so as to provide a broader horizontal spread of light.
  • FIG. 9C The calculated output from the sub-unit 920 is presented in FIG. 9C, which shows the output over an angular aperture of ⁇ 35° by ⁇ 5°.
  • sub-units for producing beams 3 and 4 may be designed in a manner similar to the design used for sub-units 820 and 920. It will be appreciated that the designs described in Examples 1 and 2 are illustrative only, and that other factors not discussed here may also affect the output power and divergence of the light from a sub-unit.
  • reflectors formed from these different surfaces may be hollow reflectors or may be solid reflectors.

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

Abstract

L’invention concerne un système d’éclairage utilisant une pluralité de diodes lumineuses (LED), formant une rangée, afin d’éclairer par le côté des réflecteurs respectifs. Le système d’éclairage est particulièrement utile en tant que phare de véhicule. Dans certains modes de réalisation, les réflecteurs peuvent être incurvés, par exemple paraboliques, de façon à collecter la lumière, mais tronqués dans la direction de la rangée de façon à réduire l’espace entre les LED. Dans d’autres modes de réalisation, les différents réflecteurs sont orientés dans des directions différentes de manière à étaler les faisceaux lumineux combinés pour couvrir le champ de vision du conducteur du véhicule. Dans d’autres modes de réalisation, les réflecteurs associés aux différentes diodes lumineuses peuvent être formés sur un même corps moulé.
PCT/US2005/035274 2005-09-30 2005-09-30 Systeme d’eclairage utilisant une pluralite de diodes lumineuses WO2007040527A1 (fr)

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PCT/US2005/035274 WO2007040527A1 (fr) 2005-09-30 2005-09-30 Systeme d’eclairage utilisant une pluralite de diodes lumineuses

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
EP2045515A1 (fr) * 2007-10-04 2009-04-08 Valeo Vision Dispositif d'éclairage ou de signalisation pour véhicule automobile
FR2941785A1 (fr) * 2009-02-05 2010-08-06 Valeo Vision Sas Dispositif optique, notamment pour vehicule automobile, tel qu'un dispositif d'eclairage ou de signalisation
WO2011042837A1 (fr) * 2009-10-08 2011-04-14 Koninklijke Philips Electronics N.V. Lentille de génération de faisceau lumineux asymétrique
DE102009049385A1 (de) * 2009-10-15 2011-04-21 Hella Kgaa Hueck & Co. Beleuchtungsvorrichtung für Fahrzeuge
ITTO20100886A1 (it) * 2010-11-05 2012-05-06 Sirio Panel Spa Dispositivo di illuminazione a led di un velivolo, in particolare per operazioni di atterraggio, decollo, rullaggio, e ricerca, e velivolo comprendente il dispositivo di illuminazione a led
EP3073185A1 (fr) * 2009-07-21 2016-09-28 Valeo Vision Module d'eclairage pour projecteur de vehicule automobile, et projecteur equipe d'au moins un tel module
WO2017013322A1 (fr) * 2015-07-20 2017-01-26 Peugeot Citroen Automobiles Sa Élément optique à pièce monobloc, pour un bloc optique sans glace
US9616811B2 (en) 2012-07-10 2017-04-11 Emergency Technology, Inc. Emergency vehicle light fixture with reflective surface having alternating linear and revolved parabolic segments
DE102018120733B4 (de) * 2017-08-24 2020-04-09 Hasco Vision Technology Co., Ltd. Beleuchtungseinrichtung einer Fahrzeugleuchte, Fahrzeugleuchten-Baugruppe und Fahrzeug

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045515A1 (fr) * 2007-10-04 2009-04-08 Valeo Vision Dispositif d'éclairage ou de signalisation pour véhicule automobile
FR2921999A1 (fr) * 2007-10-04 2009-04-10 Valeo Vision Sa Dispositif d'eclairage ou de signalisation pour vehicule automobile.
JP2009094066A (ja) * 2007-10-04 2009-04-30 Valeo Vision 自動車用照明または信号装置
US8920006B2 (en) 2007-10-04 2014-12-30 Valeo Vision Lighting or signaling device for a motor vehicle
US8579483B2 (en) 2009-02-05 2013-11-12 Valeo Vision Optical device, in particular for an automotive vehicle, such as a lighting or signaling device
EP2216589A1 (fr) * 2009-02-05 2010-08-11 Valeo Vision Dispositif optique d'éclairage ou de signalisation, notamment pour véhicule automobile
FR2941785A1 (fr) * 2009-02-05 2010-08-06 Valeo Vision Sas Dispositif optique, notamment pour vehicule automobile, tel qu'un dispositif d'eclairage ou de signalisation
US8939625B2 (en) 2009-02-05 2015-01-27 Valeo Vision Optical device, in particular for an automotive vehicle, such as a lighting or signalling device
EP3073185A1 (fr) * 2009-07-21 2016-09-28 Valeo Vision Module d'eclairage pour projecteur de vehicule automobile, et projecteur equipe d'au moins un tel module
WO2011042837A1 (fr) * 2009-10-08 2011-04-14 Koninklijke Philips Electronics N.V. Lentille de génération de faisceau lumineux asymétrique
EP2486605B1 (fr) 2009-10-08 2017-09-13 Philips Lighting Holding B.V. Lentille de génération de faisceau lumineux asymétrique
US9039252B2 (en) 2009-10-08 2015-05-26 Koninklijkle Philips N.V. Lens for asymmetrical light beam generation
DE102009049385A1 (de) * 2009-10-15 2011-04-21 Hella Kgaa Hueck & Co. Beleuchtungsvorrichtung für Fahrzeuge
US8807803B2 (en) 2010-11-05 2014-08-19 Sirio Panel S.P.A. LED lighting device of an aircraft, in particular for maneuvers of landing, take-off, taxiing, and searching, and aircraft comprising said device
EP2450279A1 (fr) * 2010-11-05 2012-05-09 Sirio Panel S.P.A. Dispositif d'éclairage à DEL d'un avion, en particulier pour les manýuvres d'atterrissage, de décollage, de roulement au sol et de recherche et avion comprenant ledit dispositif
ITTO20100886A1 (it) * 2010-11-05 2012-05-06 Sirio Panel Spa Dispositivo di illuminazione a led di un velivolo, in particolare per operazioni di atterraggio, decollo, rullaggio, e ricerca, e velivolo comprendente il dispositivo di illuminazione a led
US9616811B2 (en) 2012-07-10 2017-04-11 Emergency Technology, Inc. Emergency vehicle light fixture with reflective surface having alternating linear and revolved parabolic segments
WO2017013322A1 (fr) * 2015-07-20 2017-01-26 Peugeot Citroen Automobiles Sa Élément optique à pièce monobloc, pour un bloc optique sans glace
FR3039250A1 (fr) * 2015-07-20 2017-01-27 Peugeot Citroen Automobiles Sa Element optique a piece monobloc, pour un bloc optique sans glace
DE102018120733B4 (de) * 2017-08-24 2020-04-09 Hasco Vision Technology Co., Ltd. Beleuchtungseinrichtung einer Fahrzeugleuchte, Fahrzeugleuchten-Baugruppe und Fahrzeug

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