FR3041067A1 - Luminous device, in particular for a motor vehicle - Google Patents

Luminous device, in particular for a motor vehicle Download PDF

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Publication number
FR3041067A1
FR3041067A1 FR1558591A FR1558591A FR3041067A1 FR 3041067 A1 FR3041067 A1 FR 3041067A1 FR 1558591 A FR1558591 A FR 1558591A FR 1558591 A FR1558591 A FR 1558591A FR 3041067 A1 FR3041067 A1 FR 3041067A1
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FR
France
Prior art keywords
light
device according
even
preceding
light device
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Granted
Application number
FR1558591A
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French (fr)
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FR3041067B1 (en
Inventor
Pierre Albou
Vanesa Sanchez
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Valeo Vision SA
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Valeo Vision SA
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Publication date
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Priority to FR1558591A priority Critical patent/FR3041067B1/en
Publication of FR3041067A1 publication Critical patent/FR3041067A1/en
Application granted granted Critical
Publication of FR3041067B1 publication Critical patent/FR3041067B1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/143Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2105/00Planar light sources
    • F21Y2105/10Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

The invention relates to a light device, in particular for a motor vehicle, comprising light sources (2), generating a light beam, and an optical system (6) for projecting said light beam, said light device being configured so that said optical system ( 6) producing illumination at a distance greater than two hundred meters, said light sources (2) being electroluminescent semiconductor sources, said luminous device further comprising a substrate (4) for growth of said light sources (2).

Description

Luminous device, in particular for a motor vehicle

The present invention relates to a projector-type light device, in particular for a motor vehicle. In particular, it is intended to generate long-range lighting, greater than that produced by conventional headlights, that is to say lighting greater than 150 meters.

In this field, it is known for a long time of the auxiliary projectors for illuminating a scene far ahead of the vehicle, in a concentrated manner. These are generally after-sales projectors by vehicle owners who have to meet specific driving conditions.

Such projectors require a high light output and are generally quite bulky when they use conventional lighting technologies.

More recently, long-throw projectors have been proposed using a laser light source. Projectors obtained from such sources are less bulky. However, they have a major drawback in terms of safety. Indeed, if the laser beam follows an unexpected path, for example following a failure of one of the optical components provided downstream in the path of the beam, or following an accident of the equipped vehicle, it can cause serious burns because of its intensity.

A first solution is to provide security systems that mitigate this risk. However, a system can be defeated in some particular cases and in this case must be combined with another security system. The object of the invention is to overcome at least partially the drawbacks mentioned above and proposes for this purpose a light device, in particular for a motor vehicle, comprising light sources, generating a light beam, and an optical system for projecting said light beam, said light device being configured for said optical system to provide illumination at a distance greater than two hundred meters, said light sources being semiconductor light emitting sources, said light device further comprising a growth substrate of said light sources.

Through the use of such light sources, it is possible, in a space that remains limited, a light device for generating a concentrated beam and powerful without using a laser. Indeed, the use of the same growth substrate makes it possible to have the density of electroluminescent sources desired to obtain long-range lighting, for example up to more than two hundred meters, or even up to more than 600 meters.

It should be noted that such a choice may seem surprising because then the light sources are used in a field where they certainly offer a high luminance but a low intensity. Their energy efficiency is also very poor compared to their preferred use.

Complementary features of the invention, which may be considered alone or in combination, follow: - said light sources are light-emitting diodes, disposed on said substrate, - said light-emitting diodes are electroluminescent rods of submillimetric dimensions, extending from said substrate, - said substrate is a layer of material, in particular Si, - said rods are evenly distributed on said substrate, - said rods are arranged on an orthogonal grid with constant pitch d and / or have a constant height h; a h / d2 ratio is greater than 0.003, or even 0.005, or even 0.05, or even 0.1 or even 0.4, the height h and the distance d being measured in micrometres, the height h is greater than or equal to 2.5 or even 5 μm, the distance d is less than or equal to 30, or even 20 or even 10 or even 5 μm, said light sources are configured to produce a luminance of from minus 120 Cd / mm 2, preferably at least 150 Cd / mm 2; said optical system is an optical concentration system, said optical system is a lens and / or a reflector, said optical system is configured to produce at least one beam cutoff, the beam being for example a beam complementary to a beam. base beam, for example of road type, the cut not being then visible, - said optical system is configured to produce two cuts forming an angle between them, in particular two perpendicular cuts, - said light device comprises a control unit configured to control the power supply of said sources; said control unit comprises a printed circuit board; said board is disposed on a face of said substrate opposite a face carrying said light sources. Other advantages and characteristics of the invention will appear on reading the following description, given solely by way of nonlimiting example, and with reference to the appended drawings in which: FIG. 1 schematically illustrates an example of lighting system according to the invention.

As illustrated in FIG. 1, the invention relates to a light device, in particular of the projector type, in particular for a motor vehicle, comprising light sources 2, generating a light beam, and an optical system 6 for projecting said light beam, said light device. being configured for said optical system to provide illumination at a distance greater than two hundred meters, or even more than 600 meters. It may in particular be an additional light device, intended to be mounted on the vehicle in addition to light devices which it is provided at the factory outlet.

Said light sources 2 are, for example, electroluminescent semiconductor sources, said luminous device further comprising a substrate 4 for growth of said light sources. The use of such light sources avoids the use of laser sources and the disadvantages they pose in terms of security, while having the specific lighting desired and limiting the volume used.

Said light sources 2 are, for example, light-emitting diodes, arranged on said substrate 4. In particular, these are light-emitting diodes configured in the form of electroluminescent rods of submillimetric dimensions, each rod 2 being here symbolized by a line.

Said rods extend from said substrate 4 which may be a layer of material, especially Si.

Said rods 2 have a concentric layer structure, especially GaN layers with interposition of quantum wells, said layers being generated from said substrate 4. The nature and arrangement of the layers allow the emission of photons all along the rods.

Said substrate 4 and said rods 2 are formed by one or more chips. For example, in known chips using such a technology, said rods 4 have a diameter of less than one micron for a height of the order of a few microns and are spaced from each other on the substrate 4 from a distance of the order of 10 to 50 microns. The one or more chips are, in particular, rectangular in shape and the dimensions of their sides are of the order of one centimeter.

Said luminous device may also comprise one or more phosphors for changing the color emitted by said light sources. In other words, said system may comprise a wavelength converter. By wavelength converter is meant a light converter comprising at least one luminescent material designed to absorb at least a portion of at least one excitation light emitted by a light source and to convert at least a portion of said light of excitation absorbed into an emission light having a wavelength different from that of the excitation light. By way of example, to emit white light, blue or UV light emitting rods with a light converter will be used to add white light by additive synthesis.

Said rods are advantageously regularly distributed over said substrate and they are separated by a distance d and / or have a constant height h. For example, an h / d2 ratio is greater than 0.003, or even 0.005, or even 0.05, or even 0.1 or even 0.4, the height h and the pitch d being measured in micrometres. More specifically, the distance d is measured between a stick and the adjacent rods, particularly at their longitudinal axis of extension. The height h is measured between the substrate 4 and the free end of the rods.

Said height h is, for example, greater than or equal to 2.5, or even 5 μm, while the distance d is, for example, less than or equal to 30, or even 20, or even 10 or even 5 μm.

Said light sources 2 are preferably configured to produce a sufficiently strong luminance over a sufficiently large surface area of at least 120 Cd / mm 2, preferably at least 150 Cd / mm 2

Said light sources 2 are intended to form a light zone positioned relative to said optical system, in particular so as to project said long-range light zone onto a limited surface. In other words, said optical system is an optical focusing system enabling the light device to perform a far-off function from said light sources 2.

Said optical system 6 is here a lens 8. Said lens 8 and the chip formed of the rods 2 and the substrate 4 have been illustrated without concern for scale and regardless of their respective size. The light zone defined by said light sources is preferably positioned at the focus of said lens 8.

It may also be used, complementary or in substitution, a reflector or any other optical system.

Said light device is advantageously configured to supply current to said light sources. In case of the use of a plurality of chips, said chips are preferably fed in parallel.

Said light device comprises for this, for example, a control unit, not shown. Said control unit comprises, in particular, a printed circuit board. Said card may be disposed on a face of said substrate opposite a face carrying said light sources 2. In other words, at least a portion of the control unit, here said printed circuit board, is stacked under the substrate so as to connect electrically said control unit to said substrate. Said printed circuit board is, for example, a pcb type card, fpcb, mpcb, smi, according to the acronyms usually used in this field.

Said light device may further comprise a heat sink, said card being located between said substrate and said dissipator.

Said control unit is advantageously configured to take into account information relating to the presence of vehicles or persons in the area likely to be illuminated by the light device in order to be able to deactivate said light sources so as to avoid glare.

Preferably, said optical system comprises a shaping optics, in particular configured to produce at least one beam cutoff. Even more preferentially, said optics is configured to produce two cuts forming an angle between them, in particular two perpendicular cuts.

Said optical system, in particular said lens, may be in contact with the free end of said rods.

Said light device may further comprise a housing closed by an ice, said housing accommodating the assembly formed by said one or more chips, the printed circuit board and the heat sink and the associated optical system. Said luminous device is advantageously configured to be attached to external parts of a vehicle with the aid of attachment brackets provided for this purpose. Said light device will advantageously be configured so that it can be arranged in line on the vehicle alongside identical light devices.

Said light devices are preferentially selectively activatable, in particular by means of their control unit, in order to be able to control the illuminated area and to limit the risks of dazzling of the vehicles or persons present.

Claims (11)

  1. A light device, in particular for a motor vehicle, comprising light sources (2), generating a light beam, and an optical system (6) for projecting said light beam, said light device being configured so that said optical system (6) produces illumination at a distance greater than two hundred meters, said light sources (2) being electroluminescent semiconductor sources, said luminous device further comprising a substrate (4) for growth of said light sources (2).
  2. 2. Light device according to the preceding claim wherein said light sources (2) are light-emitting diodes, disposed on said substrate (4).
  3. 3. Light device according to the preceding claim wherein said light emitting diodes are electroluminescent rods of submillimeter dimensions, extending from said substrate (4).
  4. 4. Light device according to the preceding claim wherein said rods are regularly distributed over said substrate (4).
  5. 5. Light device according to any one of claims 3 or 4 wherein said rods are arranged on an orthogonal grid constant pitch d and / or have a height h constant.
  6. 6. Light device according to claim 5 wherein an h / d2 ratio is greater than 0.003, or even 0.005, or even 0.05, or even 0.1, or even 0.4, the height h and the distance d being measured in micrometer.
  7. 7. Light device according to any one of claims 5 or 6 wherein the height h is greater than or equal to 2.5 or 5 pm and / or the distance d is less than or equal to 30 or 20 or even at 10 or 5 pm.
  8. The luminous device according to any one of the preceding claims wherein said light sources (2) are configured to produce a luminance of at least 120 Cd / mm 2, preferably at least 150 Cd / mm 2.
  9. 9. Light device according to any one of the preceding claims in said optical system (6) is a lens (8) and / or a reflector.
  10. The light device according to any one of the preceding claims wherein said optical system (6) is configured to produce at least one beam cut produced by the light device.
  11. 11. Lighting device according to any one of the preceding claims wherein said device produces an additional beam to a base beam, the base beam being for example road type.
FR1558591A 2015-09-14 2015-09-14 Luminous device, in particular for a motor vehicle Active FR3041067B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR1558591A FR3041067B1 (en) 2015-09-14 2015-09-14 Luminous device, in particular for a motor vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1558591A FR3041067B1 (en) 2015-09-14 2015-09-14 Luminous device, in particular for a motor vehicle

Publications (2)

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FR3041067A1 true FR3041067A1 (en) 2017-03-17
FR3041067B1 FR3041067B1 (en) 2017-09-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010034276A1 (en) * 2008-09-29 2010-04-01 Osram Opto Semiconductors Gmbh Headlight having a plurality of luminescent diode emitters
US20110205049A1 (en) * 2010-02-22 2011-08-25 Koninklijke Philips Electronics N.V. Adaptive lighting system with iii-nitride light emitting devices
DE102010012711A1 (en) * 2010-03-25 2011-09-29 Osram Opto Semiconductors Gmbh A radiation-emitting semiconductor component and method for producing a radiation-emitting semiconductor component
US20110260178A1 (en) * 2010-04-26 2011-10-27 Philips Lumileds Lighting Company, Llc Lighting system including collimators aligned with light emitting segments
US20140078757A1 (en) * 2012-09-14 2014-03-20 Tsmc Solid State Lighting Ltd. High Voltage LED with Improved Heat Dissipation and Light Extraction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010034276A1 (en) * 2008-09-29 2010-04-01 Osram Opto Semiconductors Gmbh Headlight having a plurality of luminescent diode emitters
US20110205049A1 (en) * 2010-02-22 2011-08-25 Koninklijke Philips Electronics N.V. Adaptive lighting system with iii-nitride light emitting devices
DE102010012711A1 (en) * 2010-03-25 2011-09-29 Osram Opto Semiconductors Gmbh A radiation-emitting semiconductor component and method for producing a radiation-emitting semiconductor component
US20110260178A1 (en) * 2010-04-26 2011-10-27 Philips Lumileds Lighting Company, Llc Lighting system including collimators aligned with light emitting segments
US20140078757A1 (en) * 2012-09-14 2014-03-20 Tsmc Solid State Lighting Ltd. High Voltage LED with Improved Heat Dissipation and Light Extraction

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