EP2821692B1 - Secure optical module for a motor vehicle including a laser source - Google Patents

Secure optical module for a motor vehicle including a laser source Download PDF

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Publication number
EP2821692B1
EP2821692B1 EP14173410.3A EP14173410A EP2821692B1 EP 2821692 B1 EP2821692 B1 EP 2821692B1 EP 14173410 A EP14173410 A EP 14173410A EP 2821692 B1 EP2821692 B1 EP 2821692B1
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EP
European Patent Office
Prior art keywords
conversion device
detector
light
laser radiation
module
Prior art date
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EP14173410.3A
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German (de)
French (fr)
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EP2821692A1 (en
Inventor
Loïc Boinet
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Valeo Vision SAS
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Valeo Vision SAS
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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
    • 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
    • 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
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • 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
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • 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
    • F21S45/70—Prevention of harmful light leakage

Definitions

  • the present invention relates to headlights for a motor vehicle, more particularly, to secure headlights comprising a laser source.
  • Motor vehicles are known equipped with lighting projectors comprising an optical module comprising a laser source, a scanning system and a device for converting the laser radiation into white light.
  • the laser source emits radiation
  • this radiation is received by the scanning system which directs it towards the conversion device.
  • the conversion device receives monochromatic and coherent laser radiation and re-emits white light radiation used to form the illumination beam at the front of the vehicle.
  • the scanning system and / or the conversion device may be damaged, or the laser source may be misaligned. These failures can also occur without impacting the vehicle. It is therefore necessary to prevent the module from emitting potentially dangerous laser radiation outside the module if it touches a person.
  • a lighting device for an automotive laser headlight comprising a sensor for the light reflected by a reflecting part located on the surface of the device for converting into white light.
  • the sensor detects an abnormality in the conversion device based on the reflected beam to drive the laser source control system.
  • the sensor only detects laser light reflected from a mirror, and no diffuse or residual laser light.
  • a lighting device for an automotive laser projector comprising a sensor receiving the light generated by the conversion device to detect anomalies in this light.
  • this is light emitted directly by the phosphor, and not diffuse or residual laser light.
  • the document WO2013001953 also shows a motor vehicle headlamp comprising laser sources and a detection system for detecting when the laser radiation is deviated from its normal course.
  • the object of the invention is to remedy these drawbacks by providing a secure optical module.
  • the detector is able to receive a residual light emanating from the source and coming from the conversion device.
  • this module it is thus possible to measure a parameter or a series of parameters of the light reflected or transmitted by the conversion device and coming from the light source.
  • This light being reflected or transmitted by the shaping system before reaching the conversion device, any malfunction of the source, of the shaping system and / or of the conversion device modifies the residual light received by the converter. detector.
  • the anomaly can come from a failure of the detector, a misalignment of the laser source, a malfunction of the shaping system and / or a degradation of the conversion device.
  • This module in cooperation with a control unit, therefore makes it possible to detect a large number of different anomalies. Thus, if the residual radiation received by the detector does not comply with the expected radiation, an operating anomaly of one of the elements of the optical module is detected very quickly.
  • the module can also include one or more of the following characteristics, taken alone or in combination.
  • the module can include a control unit capable of comparing at least one parameter of the laser radiation emitted by the source with at least one parameter of the residual light received by the detector.
  • control unit is included in the module.
  • the module comprises a housing for receiving the conversion device, the detector being positioned facing an opening in the housing.
  • the detector is positioned opposite the shaping system.
  • the detector comprises a photodiode.
  • this type of detector is simple and makes it possible to reliably detect the residual light reflected by the conversion device and to transform it into an electrical signal which can be easily processed by the control unit.
  • the module comprises a filter arranged between the conversion device and the detector.
  • this filter we can reduce the stray light that can enter the module and coming from an oncoming vehicle and / or ambient light, for example. It is also possible to consider using a cheaper detector.
  • this sensor it is possible to take into account the temperature of the module and to compare more precisely the residual light with that which is expected in normal operation of the module.
  • the residual light does not pass through the optical system.
  • the residual light passes through the optical system.
  • the residual light is reflected by the optical system, for example by glass reflection, before reaching the detector.
  • the shaping system and the optical system are located on the same side of the conversion device.
  • the conversion device is therefore used in reflection.
  • the shaping system and the optical system are located on either side of the conversion device.
  • the conversion device is then used in transmission.
  • the subject of the invention is also a headlight for a motor vehicle comprising at least one module as defined above.
  • Another object according to the invention is a motor vehicle comprising at at least one module according to the present invention.
  • control unit calculates the intensity of light that the detector should receive and compares it with the intensity actually measured by the detector.
  • the detector is a photodiode
  • the control unit can also check that the ratio of the intensity of the light emitted by the light source and the intensity of the residual light actually measured by the detector is between two predefined threshold values over time.
  • control unit calculates the intensity of the light that the detector should receive as a function of the position of the laser radiation on the conversion system. This compares two series of parameters that can be presented graphically in the form of two curves, that calculated from the emission data of the source and that obtained from the residual radiation received by the detector.
  • FIG. 1 One represented on the figure 1 a projector 10 for a motor vehicle.
  • This projector includes three modules 12, 14, 16.
  • the first module 12 comprises a laser light source 18, a laser radiation shaping system 20, a device 22 for converting the radiation into white light and an optical system 24.
  • the focusing system shaped 20 comprises a scanning system 26 having a micro-mirror mounted movable around two orthogonal axes.
  • the module 12 can also include conventional means 19 for focusing the source 18, these means 19 being interposed between the source 18 and the scanning system 26.
  • the laser light source 18, the focusing means 19 of the source and the scanning system 26 can be part of a micro-opto-electro-mechanical system 21.
  • MOEMS micro-opto-electro-mechanical system
  • MOEMS is a optical system comprising, in the present case, at least one laser light source and a scanning system.
  • MOEMS are compact, reliable, easy-to-use devices that allow high precision and flexibility in the redirection of radiation to the conversion device.
  • the laser light source 18 is in the present case a laser diode capable of emitting laser radiation L whose wavelength is between 400 and 500 nanometers (nm), preferably between 450 and 460 nm.
  • the conversion device 22 comprises a support 28 reflecting the laser radiation on which is deposited a continuous layer 30 of phosphorescent material.
  • the scanning system 26 and the optical system 24 are located on the same side of the conversion device 22, that is to say that the conversion device 22 is used in reflection.
  • the support 28 is chosen from materials which are thermally good conductors. It is therefore possible to limit the degradation of the layer 30 of phosphorescent material by limiting the rise in temperature of the conversion device 22 and of the layer 30.
  • the laser light source 18 emits L radiation
  • this radiation is received by the scanning system 26 which directs it towards the conversion device 22.
  • the conversion device 22 receives the monochromatic and coherent laser radiation L and re-emits white light radiation B, that is to say comprising a plurality of wavelengths between about 400 and 800 nm. This light emission occurs according to a Lambertian emission pattern, that is to say with uniform luminance in all emission directions.
  • the conversion device 22 being located in the vicinity of the focal plane of the system optical 24, such as a lens, the white light B thus obtained is emitted in particular towards the optical system 24 and forms, on the opposite side of the lens, at infinity, an image of the points of the layer 30 of phosphorescent material which emit white light B in response to the received laser radiation L.
  • the scanning of the points of the layer 30 being carried out at high speed, the white light B emitted by the conversion device 22 makes it possible to form a light beam F, in the present case, a part of the light beam produced by the projector 10 which comprises module 12.
  • the laser radiation L received by the conversion device 22, that is to say by the layer 30 of phosphorescent material is reflected without being converted and forms residual laser light R which is not directed towards the system. optical 24.
  • This residual laser light R is in particular received by a detector 34 comprising a photodiode.
  • This residual light R is therefore of the same wavelength as the light source 18.
  • the laser light source 18 is a blue light source, the residual light will also be blue.
  • the detector 34 can therefore be chosen with a range of detected wavelengths of low amplitude, for example the laser radiation can be typically 445 nm and the photodiode has a detection range provided between 435 and 455 nm.
  • the module 12 further comprises a control unit 32 which makes it possible in particular to control the power of the laser light source 18, the movements of the scanning system 26 and to compare a parameter of the laser radiation L emitted by the source 18 with a parameter of the residual laser light R received by the detector 34.
  • the module 12 also includes a sensor 42 for measuring the temperature. It makes it possible to measure the temperature in the module 12 and to provide this information to the control unit 32.
  • the detector 34 is located opposite the scanning system 26, that is to say that the detector 34 and the scanning system 26 are arranged on either side of a straight line orthogonal to the plane of the conversion device 22.
  • the shape and intensity of the part of the beam formed by the module 12 depend in particular on the intensity of the laser light source 18 and the movements of the scanning system 26.
  • a module 12 which comprises a single laser light source 18, a single scanning system 26, a single device 22 for converting the radiation into white light and a single optical system 24.
  • the module 12 can comprise, for example, two laser light sources 18 each emitting radiation towards a same scanning system 26.
  • the two sources 18 can emit radiation towards distinct respective scanning systems 26.
  • the scanning systems 26 can emit the laser radiation L to the same converter 22 or different devices 22.
  • the optical device 24 can receive white light B from one or more conversion devices 22.
  • the module 12 can also include more than two sources 18.
  • the module 12 further comprises a housing 36 receiving the light source 18, the scanning system 26 in the form of a MOEMS 21 and the conversion device 28.
  • the detector 34 is positioned outside the housing 36 facing an opening 38 of the housing 36.
  • the opening 38 is itself positioned facing the MOEMS 21, that is to say that the detector 34 and the scanning system 26 are arranged on either side of a straight line orthogonal to the plane of the conversion device 22.
  • Module 12 of the figure 4 is similar to that of figure 3 .
  • a filter 40 has been interposed between the scanning system 26 and the detector 34.
  • the module 12 comprises a static shaping system 20. It will be noted that the shaping system 20 and the optical system 24 are not located on the same side of the conversion device 22, that is to say. say that the conversion device 22 is used in transmission. Unlike the previous embodiments, the residual laser light R coming from the conversion device 22 is directed towards the optical system 24 and at least a part of this residual light R is then reflected, for example by glass reflection, towards the detector 34 provided. a filter 40.
  • the residual light R does not pass through the optical system 24 while in the fourth embodiment, the residual light R is reflected by the optical system 24.
  • control unit 32 compares at least one parameter of the laser radiation L emitted by the source 18 with at least one parameter of the residual light R received by the detector 34.
  • the parameters of the laser radiation L can for example be a series of parameters calculated from the emission data from the source 18, this series of parameters being able to be represented in the form of a curve.
  • this curve is corrected by the control unit 32 taking into account the temperature measured by the sensor 42.
  • curve 44 representing the evolution of the intensity of the electric current in amperes supplying the laser source as a function of time in milliseconds as well as a curve 46 representing the evolution of the calculated intensity of the electric current which should come from detector 34, in this case, a photodiode.
  • the intensity of the electric current supplied to the laser source is proportional to the light intensity of the emitted laser radiation and the photodiode reliably detects the residual light reflected by the conversion device and transforms it into an electrical signal that can be easily processed by control unit 32.
  • the control unit 32 therefore compares the intensities of the electric current respectively calculated and measured by the detector 34 as a function of time. When the difference between these two values crosses a predetermined threshold, an anomaly is observed.
  • a curve 48 representing the ratio between the intensity of the electric current supplying the laser source and the intensity of the electric current measured from the detector 34 over time.
  • This curve 48 can change over time between a lower limit 50 and an upper limit 52. When the curve 48 is not between the lower and upper limits, an anomaly is observed.
  • the optical module 12 can be used in the headlight 10 in order in particular to form a passing beam, a driving beam, a fog light, an anti-glare driving beam or a bad weather beam, called AWL according to the English acronym for "Adverse Weather Light".
  • the projector 10 can comprise a first module according to the invention and second and third modules not comprising a laser light source.
  • the projector 10 can also include two modules comprising each at least one laser light source 18, at least one scanning system 20 and at least one device for converting the radiation into white light 22 and a third module not including one.
  • the projector 10 can also include two modules.
  • the module or modules without a laser source can have a conventional light source, such as an LED.
  • the modules of the first and second embodiments may include a filter 40, that the modules of the third and fourth embodiments may not include a filter 40, that the modules of the second, third and fourth embodiments. embodiment may include a sensor 42 and that the module of the first embodiment may not include a sensor 42.
  • control unit 32 may not be a single block and that, within the meaning of the invention, this element comprises different parts making it possible to perform in particular the functions of controlling the light source 18, calculating the parameter of the light to be received by the detector 34, comparing this parameter with the parameter of the residual light R received by the detector 34 and controlling the actions to be carried out when an anomaly is detected.
  • these different parts can however be located at different locations in the vehicle.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Description

La présente invention concerne les projecteurs pour véhicule automobile, plus particulièrement, les projecteurs sécurisés comprenant une source laser.The present invention relates to headlights for a motor vehicle, more particularly, to secure headlights comprising a laser source.

On connaît des véhicules automobiles dotés de projecteurs d'éclairage comprenant un module optique comportant une source laser, un système de balayage et un dispositif de conversion du rayonnement laser en lumière blanche. Lorsque la source laser émet un rayonnement, ce rayonnement est reçu par le système de balayage qui le dirige vers le dispositif de conversion. Le dispositif de conversion reçoit le rayonnement laser monochromatique et cohérent et réémet un rayonnement de lumière blanche utilisé pour former le faisceau d'éclairage à l'avant du véhicule.Motor vehicles are known equipped with lighting projectors comprising an optical module comprising a laser source, a scanning system and a device for converting the laser radiation into white light. When the laser source emits radiation, this radiation is received by the scanning system which directs it towards the conversion device. The conversion device receives monochromatic and coherent laser radiation and re-emits white light radiation used to form the illumination beam at the front of the vehicle.

Toutefois, lorsque le véhicule subit un choc, le système de balayage et/ou le dispositif de conversion peuvent être endommagés, ou la source laser peut être désalignée. Ces défaillances peuvent également survenir sans que le véhicule ne subisse de choc. Il faut alors éviter que le module puisse émettre hors du module un rayonnement laser potentiellement dangereux s'il touche une personne.However, when the vehicle is impacted, the scanning system and / or the conversion device may be damaged, or the laser source may be misaligned. These failures can also occur without impacting the vehicle. It is therefore necessary to prevent the module from emitting potentially dangerous laser radiation outside the module if it touches a person.

On connait du document US 2011 084609 un dispositif d'éclairage pour projecteur automobile à laser, comportant un capteur de la lumière réfléchie par une partie réfléchissante située à la surface du dispositif de conversion en lumière blanche. Le capteur détecte une anomalie dans le dispositif de conversion basée sur le faisceau réfléchi pour piloter le système de commande de la source laser. Le capteur ne détecte que la lumière laser réfléchie par un miroir, et pas de lumière laser diffuse ou résiduelle.We know from the document US 2011 084609 a lighting device for an automotive laser headlight, comprising a sensor for the light reflected by a reflecting part located on the surface of the device for converting into white light. The sensor detects an abnormality in the conversion device based on the reflected beam to drive the laser source control system. The sensor only detects laser light reflected from a mirror, and no diffuse or residual laser light.

On connait également du document US 2011 063115 un dispositif d'éclairage pour projecteur automobile à laser, comportant un capteur recevant la lumière engendrée par le dispositif de conversion pour détecter des anomalies dans cette lumière. Il s'agit dans ce document de la lumière émise directement par le phosphore, et pas de lumière laser diffuse ou résiduelle. Le document WO2013001953 montre aussi un projecteur de véhicule automobile comprenant des sources à laser et un système de détection pour détecter lorsque le rayonnement laser est dévié de sa course normale.We also know from the document US 2011 063115 a lighting device for an automotive laser projector, comprising a sensor receiving the light generated by the conversion device to detect anomalies in this light. In this document, this is light emitted directly by the phosphor, and not diffuse or residual laser light. The document WO2013001953 also shows a motor vehicle headlamp comprising laser sources and a detection system for detecting when the laser radiation is deviated from its normal course.

L'invention a pour but de remédier à ces inconvénients en fournissant un module optique sécurisé.The object of the invention is to remedy these drawbacks by providing a secure optical module.

À cet effet, l'invention a notamment pour objet un module optique pour véhicule automobile comprenant :

  • au moins une source de lumière apte à émettre un rayonnement laser,
  • au moins un système de mise en forme apte à recevoir le rayonnement laser et à le diriger vers au moins un dispositif de conversion du rayonnement en lumière blanche, le dispositif de conversion étant apte à réémettre la lumière blanche vers au moins un système optique, et
  • un détecteur.
To this end, the subject of the invention is in particular an optical module for a motor vehicle comprising:
  • at least one light source capable of emitting laser radiation,
  • at least one shaping system adapted to receive the laser radiation and to direct it towards at least one device for converting the radiation into white light, the conversion device being able to re-emit the white light towards at least one optical system, and
  • a detector.

Selon la présente invention, le détecteur est apte à recevoir une lumière résiduelle émanant de la source et venant du dispositif de conversion.According to the present invention, the detector is able to receive a residual light emanating from the source and coming from the conversion device.

Grâce à ce module, il est ainsi possible de mesurer un paramètre ou une série de paramètres de la lumière réfléchie ou transmise par le dispositif de conversion et provenant de la source de lumière. Cette lumière étant réfléchie ou transmise par le système de mise en forme avant d'atteindre le dispositif de conversion, toute anomalie de fonctionnement de la source, du système de mise en forme et/ou du dispositif de conversion modifie la lumière résiduelle reçue par le détecteur. Ainsi, l'anomalie peut provenir d'une panne du détecteur, d'un mauvais alignement de la source laser, d'un mauvais fonctionnement du système de mise en forme et/ou d'une dégradation du dispositif de conversion. Ce module, en coopération avec une unité de contrôle, permet donc de détecter un grand nombre d'anomalies différentes. Ainsi, si le rayonnement résiduel reçu par le détecteur n'est pas conforme au rayonnement attendu, on détecte très rapidement une anomalie de fonctionnement d'un des éléments du module optique.Thanks to this module, it is thus possible to measure a parameter or a series of parameters of the light reflected or transmitted by the conversion device and coming from the light source. This light being reflected or transmitted by the shaping system before reaching the conversion device, any malfunction of the source, of the shaping system and / or of the conversion device modifies the residual light received by the converter. detector. Thus, the anomaly can come from a failure of the detector, a misalignment of the laser source, a malfunction of the shaping system and / or a degradation of the conversion device. This module, in cooperation with a control unit, therefore makes it possible to detect a large number of different anomalies. Thus, if the residual radiation received by the detector does not comply with the expected radiation, an operating anomaly of one of the elements of the optical module is detected very quickly.

Le module peut en outre comporter une ou plusieurs des caractéristiques suivantes, prises seules ou en combinaison.The module can also include one or more of the following characteristics, taken alone or in combination.

On peut prévoir que le module comprenne une unité de contrôle apte à comparer au moins un paramètre du rayonnement laser émis par la source à au moins un paramètre de la lumière résiduelle reçue par le détecteur.Provision can be made for the module to include a control unit capable of comparing at least one parameter of the laser radiation emitted by the source with at least one parameter of the residual light received by the detector.

Ainsi, l'unité de contrôle est comprise dans le module.Thus, the control unit is included in the module.

Avantageusement, le module comprend un boîtier de réception du dispositif de conversion, le détecteur étant positionné en regard d'une ouverture du boîtier.Advantageously, the module comprises a housing for receiving the conversion device, the detector being positioned facing an opening in the housing.

L'agencement des différents éléments d'un module optique existant ne doit pas être modifié. On réalise une ouverture dans le boîtier du module et on y dispose le détecteur.The arrangement of the various elements of an existing optical module must not be changed. An opening is made in the module housing and the detector is placed there.

De façon avantageuse, le détecteur est positionné en regard du système de mise en forme.Advantageously, the detector is positioned opposite the shaping system.

Encore plus avantageusement, le détecteur comprend une photodiode.Even more advantageously, the detector comprises a photodiode.

En effet, ce type de détecteur est simple et permet de détecter de manière fiable la lumière résiduelle réfléchie par le dispositif de conversion et de la transformer en signal électrique pouvant être facilement traité par l'unité de contrôle.Indeed, this type of detector is simple and makes it possible to reliably detect the residual light reflected by the conversion device and to transform it into an electrical signal which can be easily processed by the control unit.

De préférence, le module comprend un filtre disposé entre le dispositif de conversion et le détecteur.Preferably, the module comprises a filter arranged between the conversion device and the detector.

Grâce à ce filtre, on peut réduire la lumière parasite pouvant entrer dans le module et provenant d'un véhicule venant en sens inverse et/ou de la lumière ambiante, par exemple. On peut également envisager d'utiliser un détecteur moins cher.Thanks to this filter, we can reduce the stray light that can enter the module and coming from an oncoming vehicle and / or ambient light, for example. It is also possible to consider using a cheaper detector.

On peut également prévoir que le module comprend un capteur de mesure de la température.Provision can also be made for the module to include a temperature measurement sensor.

Grâce à ce capteur, il est possible de tenir compte de la température du module et de comparer de façon plus précise la lumière résiduelle à celle qui est attendue en fonctionnement normal du module.Thanks to this sensor, it is possible to take into account the temperature of the module and to compare more precisely the residual light with that which is expected in normal operation of the module.

Selon un premier aspect de l'invention, la lumière résiduelle ne passe pas par le système optique.According to a first aspect of the invention, the residual light does not pass through the optical system.

On comprend donc que la lumière résiduelle vient du dispositif de conversion, sans passer par le système optique avant d'atteindre le détecteur.It is therefore understood that the residual light comes from the conversion device, without passing through the optical system before reaching the detector.

Selon un deuxième aspect de l'invention, la lumière résiduelle passe par le système optique.According to a second aspect of the invention, the residual light passes through the optical system.

Ainsi, la lumière résiduelle est réfléchie par le système optique, par exemple par réflexion vitreuse, avant d'atteindre le détecteur.Thus, the residual light is reflected by the optical system, for example by glass reflection, before reaching the detector.

Selon le premier aspect de l'invention, le système de mise en forme et le système optique sont situés d'un même côté du dispositif de conversion.According to the first aspect of the invention, the shaping system and the optical system are located on the same side of the conversion device.

Le dispositif de conversion est donc utilisé en réflexion.The conversion device is therefore used in reflection.

Selon le deuxième aspect de l'invention, le système de mise en forme et le système optique sont situés de part et d'autre du dispositif de conversion.According to the second aspect of the invention, the shaping system and the optical system are located on either side of the conversion device.

Le dispositif de conversion est alors utilisé en transmission.The conversion device is then used in transmission.

L'invention a également pour objet un projecteur pour véhicule automobile comprenant au moins un module tel que défini précédemment.The subject of the invention is also a headlight for a motor vehicle comprising at least one module as defined above.

Un autre objet selon l'invention est un véhicule automobile comprenant au moins un module selon la présente invention.Another object according to the invention is a motor vehicle comprising at at least one module according to the present invention.

L'invention concerne également un procédé de commande d'un module optique pour véhicule automobile comprenant les étapes suivantes :

  • une source de lumière émet un rayonnement laser vers un système de mise en forme,
  • le système de mise en forme dirige le rayonnement laser vers un dispositif de conversion du rayonnement en lumière blanche,
  • le dispositif de conversion réémet la lumière blanche vers au moins un système optique, et
  • un détecteur détecte une lumière résiduelle réfléchie émanant de la source et venant du dispositif de conversion.
The invention also relates to a method for controlling an optical module for a motor vehicle comprising the following steps:
  • a light source emits laser radiation to a shaping system,
  • the shaping system directs the laser radiation to a device for converting the radiation into white light,
  • the conversion device re-emits the white light to at least one optical system, and
  • a detector detects a reflected residual light emanating from the source and coming from the conversion device.

Avantageusement, le procédé comporte en outre les étapes suivantes :

  • une unité de contrôle calcule au moins un paramètre de la lumière à recevoir par le détecteur à partir du rayonnement laser émis par la source, et
  • l'unité de contrôle compare le paramètre calculé avec au moins un paramètre de la lumière résiduelle détectée par le détecteur.
Advantageously, the method further comprises the following steps:
  • a control unit calculates at least one parameter of the light to be received by the detector from the laser radiation emitted by the source, and
  • the control unit compares the calculated parameter with at least one parameter of the residual light detected by the detector.

Par exemple, l'unité de contrôle calcule l'intensité de la lumière que devrait recevoir le détecteur et la compare avec l'intensité réellement mesurée par le détecteur.For example, the control unit calculates the intensity of light that the detector should receive and compares it with the intensity actually measured by the detector.

Lorsque le détecteur est une photodiode, on peut également comparer l'intensité de courant électrique alimentant la source de lumière et l'intensité de courant électrique sortant de la photodiode.When the detector is a photodiode, it is also possible to compare the intensity of the electric current supplying the light source and the intensity of the electric current leaving the photodiode.

L'unité de contrôle peut aussi contrôler que le rapport de l'intensité de la lumière émise par la source de lumière et l'intensité de la lumière résiduelle réellement mesurée par le détecteur est compris entre deux valeurs seuil prédéfinies au cours du temps.The control unit can also check that the ratio of the intensity of the light emitted by the light source and the intensity of the residual light actually measured by the detector is between two predefined threshold values over time.

On peut également envisager que l'unité de contrôle calcule l'intensité de la lumière que devrait recevoir le détecteur en fonction de la position du rayonnement laser sur le système de conversion. On compare ainsi deux séries de paramètres pouvant être présentées graphiquement sous forme de deux courbes, celle calculée à partir des données d'émission de la source et celle obtenue à partir du rayonnement résiduel reçu par le détecteur.It is also conceivable that the control unit calculates the intensity of the light that the detector should receive as a function of the position of the laser radiation on the conversion system. This compares two series of parameters that can be presented graphically in the form of two curves, that calculated from the emission data of the source and that obtained from the residual radiation received by the detector.

De préférence, en présence d'une anomalie d'un type prédéterminé, l'unité de contrôle commande au moins l'une des actions suivantes :

  • l'émission d'un signal sonore et/ou visuel à l'attention d'un conducteur du véhicule,
  • l'arrêt de l'émission du rayonnement laser, et
  • la diminution de la puissance du rayonnement laser émis de sorte que le rayonnement pouvant sortir du module optique soit un rayonnement de classe 2 ou inférieure.
Preferably, in the presence of an anomaly of a predetermined type, the control unit commands at least one of the following actions:
  • the emission of an audible and / or visual signal to the attention of a driver of the vehicle,
  • stopping the emission of laser radiation, and
  • reducing the power of the emitted laser radiation so that the radiation that can exit the optical module is class 2 or lower radiation.

Ainsi, dès qu'une anomalie est détectée, il est possible d'en avertir le conducteur en émettant un signal sonore et/ou un signal visuel à son attention. Il est également possible, selon le type d'anomalie, soit d'arrêter l'émission du rayonnement laser, soit de diminuer sa puissance de sorte que le rayonnement laser pouvant sortir du module optique soit un rayonnement laser de classe 2 ou inférieure. Dans ce dernier cas, on a un fonctionnement dégradé du module mais ce dernier émet toujours un faisceau permettant au conducteur d'avoir un minimum de lumière sur la route.Thus, as soon as an anomaly is detected, it is possible to warn the driver thereof by emitting an audible signal and / or a visual signal to his attention. It is also possible, depending on the type of anomaly, either to stop the emission of the laser radiation, or to reduce its power so that the laser radiation which can exit the optical module is class 2 or lower laser radiation. In the latter case, there is a degraded operation of the module but the latter still emits a beam allowing the driver to have a minimum of light on the road.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif de la portée de l'invention et faite en se référant aux figures, dans lesquelles :

  • la figure 1 est une vue en perspective d'un projecteur selon l'invention,
  • les figures 2 à 4 sont des vues schématiques d'un module selon un premier, un deuxième et un troisième modes de réalisation de l'invention,
  • les figures 5 et 6 sont des vues d'un quatrième mode de réalisation de l'invention, respectivement en perspective et en coupe,
  • la figure 7 une représentation graphique en fonction du temps de l'intensité du courant électrique alimentant la source laser et de l'intensité du courant électrique qui devrait provenir du détecteur, et
  • la figure 8 est une représentation graphique en fonction du temps du rapport entre l'intensité du courant électrique alimentant la source laser et l'intensité du courant électrique mesurée provenant du détecteur.
The invention will be better understood on reading the description which will follow, given solely by way of non-limiting example of the scope of the invention and made with reference to the figures, in which:
  • the figure 1 is a perspective view of a projector according to the invention,
  • the figures 2 to 4 are schematic views of a module according to a first, a second and a third embodiments of the invention,
  • the figures 5 and 6 are views of a fourth embodiment of the invention, respectively in perspective and in section,
  • the figure 7 a graphical representation over time of the intensity of the electric current feeding the laser source and the intensity of the electric current which should come from the detector, and
  • the figure 8 is a graphical representation over time of the ratio between the intensity of the electric current supplied to the laser source and the intensity of the electric current measured from the detector.

On a représenté sur la figure 1 un projecteur 10 pour véhicule automobile. Ce projecteur comprend trois modules 12, 14, 16.One represented on the figure 1 a projector 10 for a motor vehicle. This projector includes three modules 12, 14, 16.

Dans cet exemple représenté sur la figure 2, le premier module 12 comprend une source de lumière laser 18, un système de mise en forme 20 du rayonnement laser, un dispositif 22 de conversion du rayonnement en lumière blanche et un système optique 24. Dans ce mode de réalisation, le système de mise en forme 20 comprend un système de balayage 26 comportant un micro-miroir monté mobile autour de deux axes orthogonaux. Le module 12 peut également comporter des moyens classiques 19 de focalisation de la source 18, ces moyens 19 étant interposés entre la source 18 et le système de balayage 26. La source de lumière laser 18, les moyens de focalisation 19 de la source et le système de balayage 26 peuvent faire partie d'un système micro-opto-électro-mécanique 21. Le système micro-opto-électro-mécanique, appelé MOEMS conformément au sigle anglais pour « Micro-Opto-Electro-Mechanical Systems », est un système optique comprenant, dans le cas présent, au moins une source de lumière laser et un système de balayage. Les MOEMS sont des dispositifs compacts, fiables, simples à utiliser et qui permettent une grande précision et une grande flexibilité de redirection du rayonnement vers le dispositif de conversion.In this example shown on figure 2 , the first module 12 comprises a laser light source 18, a laser radiation shaping system 20, a device 22 for converting the radiation into white light and an optical system 24. In this embodiment, the focusing system shaped 20 comprises a scanning system 26 having a micro-mirror mounted movable around two orthogonal axes. The module 12 can also include conventional means 19 for focusing the source 18, these means 19 being interposed between the source 18 and the scanning system 26. The laser light source 18, the focusing means 19 of the source and the scanning system 26 can be part of a micro-opto-electro-mechanical system 21. The micro-opto-electro-mechanical system, called MOEMS according to the acronym for "Micro-Opto-Electro-Mechanical Systems", is a optical system comprising, in the present case, at least one laser light source and a scanning system. MOEMS are compact, reliable, easy-to-use devices that allow high precision and flexibility in the redirection of radiation to the conversion device.

La source de lumière laser 18 est dans le cas présent une diode laser apte à émettre un rayonnement laser L dont la longueur d'onde est comprise entre 400 et 500 nanomètres (nm), de préférence entre 450 et 460 nm.The laser light source 18 is in the present case a laser diode capable of emitting laser radiation L whose wavelength is between 400 and 500 nanometers (nm), preferably between 450 and 460 nm.

Le dispositif de conversion 22 comprend un support 28 réfléchissant le rayonnement laser sur lequel est déposée une couche continue 30 de matériau phosphorescent.The conversion device 22 comprises a support 28 reflecting the laser radiation on which is deposited a continuous layer 30 of phosphorescent material.

On notera que le système de balayage 26 et le système optique 24 sont situés d'un même côté du dispositif de conversion 22, c'est-à-dire que le dispositif de conversion 22 est utilisé en réflexion.It will be noted that the scanning system 26 and the optical system 24 are located on the same side of the conversion device 22, that is to say that the conversion device 22 is used in reflection.

Avantageusement, le support 28 est choisi parmi des matériaux qui sont thermiquement bons conducteurs. Il est donc possible de limiter la dégradation de la couche 30 de matériau phosphorescent en limitant l'élévation de température du dispositif de conversion 22 et de la couche 30.Advantageously, the support 28 is chosen from materials which are thermally good conductors. It is therefore possible to limit the degradation of the layer 30 of phosphorescent material by limiting the rise in temperature of the conversion device 22 and of the layer 30.

Lorsque la source de lumière laser 18 émet un rayonnement L, ce rayonnement est reçu par le système de balayage 26 qui le dirige vers le dispositif de conversion 22.When the laser light source 18 emits L radiation, this radiation is received by the scanning system 26 which directs it towards the conversion device 22.

Le dispositif de conversion 22 reçoit le rayonnement laser monochromatique et cohérent L et réémet un rayonnement de lumière blanche B, c'est-à-dire comprenant une pluralité de longueurs d'ondes comprise entre environ 400 et 800 nm. Cette émission de lumière se produit selon un diagramme d'émission lambertienne, c'est-à-dire avec une luminance uniforme dans toutes les directions d'émission.The conversion device 22 receives the monochromatic and coherent laser radiation L and re-emits white light radiation B, that is to say comprising a plurality of wavelengths between about 400 and 800 nm. This light emission occurs according to a Lambertian emission pattern, that is to say with uniform luminance in all emission directions.

Le dispositif de conversion 22 étant situé au voisinage du plan focal du système optique 24, tel qu'une lentille, la lumière blanche B ainsi obtenue est émise notamment vers le système optique 24 et forme, du côté opposé de la lentille, à l'infini, une image des points de la couche 30 de matériau phosphorescent qui émettent de la lumière blanche B en réponse au rayonnement laser L reçu. Le balayage des points de la couche 30 étant réalisé à grande vitesse, la lumière blanche B émise par le dispositif de conversion 22 permet de former un faisceau lumineux F, dans le cas présent, une partie du faisceau lumineux produit par le projecteur 10 qui comprend le module 12.The conversion device 22 being located in the vicinity of the focal plane of the system optical 24, such as a lens, the white light B thus obtained is emitted in particular towards the optical system 24 and forms, on the opposite side of the lens, at infinity, an image of the points of the layer 30 of phosphorescent material which emit white light B in response to the received laser radiation L. The scanning of the points of the layer 30 being carried out at high speed, the white light B emitted by the conversion device 22 makes it possible to form a light beam F, in the present case, a part of the light beam produced by the projector 10 which comprises module 12.

Une partie du rayonnement laser L reçu par le dispositif de conversion 22, c'est-à-dire par la couche 30 de matériau phosphorescent, est réfléchie sans être convertie et forme une lumière laser résiduelle R qui n'est pas dirigée vers le système optique 24. Cette lumière laser résiduelle R est notamment reçue par un détecteur 34 comprenant une photodiode. Cette lumière résiduelle R est donc de la même longueur d'onde que la source de lumière 18. Ainsi, si la source de lumière laser 18 est une source de lumière bleue, la lumière résiduelle sera également bleue. Le détecteur 34 peut donc être choisi avec une plage de longueur d'ondes détectée de faible amplitude, par exemple le rayonnement laser peut être typiquement de 445 nm et la photodiode a une plage de détection prévue entre 435 et 455 nm.Part of the laser radiation L received by the conversion device 22, that is to say by the layer 30 of phosphorescent material, is reflected without being converted and forms residual laser light R which is not directed towards the system. optical 24. This residual laser light R is in particular received by a detector 34 comprising a photodiode. This residual light R is therefore of the same wavelength as the light source 18. Thus, if the laser light source 18 is a blue light source, the residual light will also be blue. The detector 34 can therefore be chosen with a range of detected wavelengths of low amplitude, for example the laser radiation can be typically 445 nm and the photodiode has a detection range provided between 435 and 455 nm.

Le module 12 comprend en outre une unité de contrôle 32 qui permet de contrôler notamment la puissance de la source de lumière laser 18, les mouvements du système de balayage 26 et de comparer un paramètre du rayonnement laser L émis par la source 18 à un paramètre de la lumière laser résiduelle R reçue par le détecteur 34.The module 12 further comprises a control unit 32 which makes it possible in particular to control the power of the laser light source 18, the movements of the scanning system 26 and to compare a parameter of the laser radiation L emitted by the source 18 with a parameter of the residual laser light R received by the detector 34.

Le module 12 comprend également un capteur 42 de mesure de la température. Il permet de mesure la température dans le module 12 et de fournir cette information à l'unité de contrôle 32.The module 12 also includes a sensor 42 for measuring the temperature. It makes it possible to measure the temperature in the module 12 and to provide this information to the control unit 32.

Dans les modes de réalisation des figures 2 à 4, le détecteur 34 est situé en regard du système de balayage 26, c'est-à-dire que le détecteur 34 et le système de balayage 26 sont disposés de part et d'autre d'une droite orthogonale au plan du dispositif de conversion 22.In the embodiments of figures 2 to 4 , the detector 34 is located opposite the scanning system 26, that is to say that the detector 34 and the scanning system 26 are arranged on either side of a straight line orthogonal to the plane of the conversion device 22.

La forme et l'intensité de la partie du faisceau formée par le module 12 dépendent notamment de l'intensité de la source de lumière laser 18 et des déplacements du système de balayage 26.The shape and intensity of the part of the beam formed by the module 12 depend in particular on the intensity of the laser light source 18 and the movements of the scanning system 26.

Sur la figure 2, on a représenté un module 12 qui comprend une unique source de lumière laser 18, un unique système de balayage 26, un unique dispositif de conversion 22 du rayonnement en lumière blanche et un unique système optique 24. Cependant, on comprend que le module 12 peut comporter, par exemple, deux sources de lumière laser 18 émettant chacune un rayonnement vers un même système de balayage 26. En variante, les deux sources 18 peuvent émettre des rayonnements vers des systèmes de balayage 26 respectifs distincts. Les systèmes de balayage 26 peuvent émettre le rayonnement laser L vers le même dispositif de conversion 22 ou des dispositifs 22 différents. Le dispositif optique 24 peut recevoir la lumière blanche B d'un ou de plusieurs dispositifs de conversion 22. Le module 12 peut également comporter plus de deux sources 18.On the figure 2 , there is shown a module 12 which comprises a single laser light source 18, a single scanning system 26, a single device 22 for converting the radiation into white light and a single optical system 24. However, it is understood that the module 12 can comprise, for example, two laser light sources 18 each emitting radiation towards a same scanning system 26. As a variant, the two sources 18 can emit radiation towards distinct respective scanning systems 26. The scanning systems 26 can emit the laser radiation L to the same converter 22 or different devices 22. The optical device 24 can receive white light B from one or more conversion devices 22. The module 12 can also include more than two sources 18.

Dans ce qui suit, les éléments communs aux différents modes de réalisation sont identifiés par les mêmes références numériques.In what follows, the elements common to the different embodiments are identified by the same reference numerals.

Sur la figure 3, on a représenté un deuxième mode de réalisation du module 12. Le module 12 comprend en outre un boîtier 36 recevant la source de lumière 18, le système de balayage 26 sous la forme d'un MOEMS 21 et le dispositif de conversion 28. Le détecteur 34 est positionné, à l'extérieur du boîtier 36 en regard d'une ouverture 38 du boîtier 36. L'ouverture 38 est elle-même positionnée en regard du MOEMS 21, c'est-à-dire que le détecteur 34 et le système de balayage 26 sont disposés de part et d'autre d'une droite orthogonale au plan du dispositif de conversion 22.On the figure 3 , there is shown a second embodiment of the module 12. The module 12 further comprises a housing 36 receiving the light source 18, the scanning system 26 in the form of a MOEMS 21 and the conversion device 28. The detector 34 is positioned outside the housing 36 facing an opening 38 of the housing 36. The opening 38 is itself positioned facing the MOEMS 21, that is to say that the detector 34 and the scanning system 26 are arranged on either side of a straight line orthogonal to the plane of the conversion device 22.

Le module 12 de la figure 4 est similaire à celui de la figure 3. On a interposé un filtre 40 entre le système de balayage 26 et le détecteur 34.Module 12 of the figure 4 is similar to that of figure 3 . A filter 40 has been interposed between the scanning system 26 and the detector 34.

Sur les figures 5 et 6, le module 12 comporte un système de mise en forme statique 20. On notera que le système de mise en forme 20 et le système optique 24 ne sont pas situés d'un même côté du dispositif de conversion 22, c'est-à-dire que le dispositif de conversion 22 est utilisé en transmission. Contrairement aux modes de réalisation précédents, la lumière laser résiduelle R venant du dispositif de conversion 22 est dirigée vers le système optique 24 et au moins une partie de cette lumière résiduelle R est ensuite réfléchie, par exemple par réflexion vitreuse, vers le détecteur 34 muni d'un filtre 40.On the figures 5 and 6 , the module 12 comprises a static shaping system 20. It will be noted that the shaping system 20 and the optical system 24 are not located on the same side of the conversion device 22, that is to say. say that the conversion device 22 is used in transmission. Unlike the previous embodiments, the residual laser light R coming from the conversion device 22 is directed towards the optical system 24 and at least a part of this residual light R is then reflected, for example by glass reflection, towards the detector 34 provided. a filter 40.

Le procédé de commande du module 12 comprend les étapes suivantes :

  • la source de lumière 18 émet un rayonnement laser L vers le système de mise en forme 20,
  • le système de mise en forme 20 dirige le rayonnement laser L vers le dispositif de conversion 22 du rayonnement L en lumière blanche B,
  • le dispositif de conversion 22 réémet la lumière blanche B notamment vers le système optique 24,
  • le détecteur 34 détecte de la lumière résiduelle R émanant de la source et venant du dispositif de conversion 22.
The method for controlling the module 12 comprises the following steps:
  • the light source 18 emits laser radiation L towards the shaping system 20,
  • the shaping system 20 directs the laser radiation L towards the device 22 for converting the radiation L into white light B,
  • the conversion device 22 re-emits the white light B in particular to the optical system 24,
  • the detector 34 detects residual light R emanating from the source and coming from the conversion device 22.

Dans les premier, deuxième et troisième modes de réalisation, la lumière résiduelle R ne passe pas par le système optique 24 alors que dans le quatrième mode de réalisation, la lumière résiduelle R est réfléchie par le système optique 24.In the first, second and third embodiments, the residual light R does not pass through the optical system 24 while in the fourth embodiment, the residual light R is reflected by the optical system 24.

Le procédé peut également comprendre les étapes suivantes :

  • l'unité de contrôle 32 calcule au moins un paramètre de la lumière à recevoir par le détecteur 34 à partir du rayonnement laser L émis par la source 18, et
  • l'unité de contrôle 32 compare le paramètre calculé avec au moins un paramètre de la lumière résiduelle R détectée par le détecteur 34.
The method can also include the following steps:
  • the control unit 32 calculates at least one parameter of the light to be received by the detector 34 from the laser radiation L emitted by the source 18, and
  • the control unit 32 compares the calculated parameter with at least one parameter of the residual light R detected by the detector 34.

On comprend donc que l'unité de contrôle 32 compare au moins un paramètre du rayonnement laser L émis par la source 18 à au moins un paramètre de la lumière résiduelle R reçue par le détecteur 34.It is therefore understood that the control unit 32 compares at least one parameter of the laser radiation L emitted by the source 18 with at least one parameter of the residual light R received by the detector 34.

Les paramètres du rayonnement laser L peuvent par exemple être une série de paramètres calculés à partir des données d'émission de la source 18, cette série de paramètres pouvant être représentée sous forme d'une courbe. Avantageusement, cette courbe est corrigée par l'unité de contrôle 32 en tenant compte de la température mesurée par le capteur 42.The parameters of the laser radiation L can for example be a series of parameters calculated from the emission data from the source 18, this series of parameters being able to be represented in the form of a curve. Advantageously, this curve is corrected by the control unit 32 taking into account the temperature measured by the sensor 42.

Sur la figure 7, on a illustré une courbe 44 représentant l'évolution de l'intensité du courant électrique en ampère alimentant la source laser en fonction du temps en millisecondes ainsi qu'une courbe 46 représentant l'évolution de l'intensité du courant électrique calculée qui devrait provenir du détecteur 34, dans le cas présent, une photodiode.On the figure 7 , there is illustrated a curve 44 representing the evolution of the intensity of the electric current in amperes supplying the laser source as a function of time in milliseconds as well as a curve 46 representing the evolution of the calculated intensity of the electric current which should come from detector 34, in this case, a photodiode.

L'intensité du courant électrique alimentant la source laser est proportionnelle à l'intensité lumineuse du rayonnement laser émis et la photodiode permet détecter de manière fiable la lumière résiduelle réfléchie par le dispositif de conversion et de la transformer en signal électrique pouvant être facilement traité par l'unité de contrôle 32.The intensity of the electric current supplied to the laser source is proportional to the light intensity of the emitted laser radiation and the photodiode reliably detects the residual light reflected by the conversion device and transforms it into an electrical signal that can be easily processed by control unit 32.

L'unité de contrôle 32 compare donc les intensités du courant électrique respectivement calculée et mesurée par le détecteur 34 en fonction du temps. Lorsque la différence entre ces deux valeurs franchit un seuil prédéterminé, une anomalie est constatée.The control unit 32 therefore compares the intensities of the electric current respectively calculated and measured by the detector 34 as a function of time. When the difference between these two values crosses a predetermined threshold, an anomaly is observed.

Sur la figure 8, on a illustré une courbe 48 représentant le rapport entre l'intensité du courant électrique alimentant la source laser et l'intensité du courant électrique mesurée provenant du détecteur 34 au cours du temps. Cette courbe 48 peut évoluer au cours du temps entre une limite basse 50 et une limite haute 52. Lorsque la courbe 48 n'est pas comprise entre les limites basse et haute, une anomalie est constatée.On the figure 8 , there is illustrated a curve 48 representing the ratio between the intensity of the electric current supplying the laser source and the intensity of the electric current measured from the detector 34 over time. This curve 48 can change over time between a lower limit 50 and an upper limit 52. When the curve 48 is not between the lower and upper limits, an anomaly is observed.

Les valeurs illustrées aux figures 7 et 8 sont données uniquement à titre indicatif et non limitatif.The values shown in figures 7 and 8 are given only as an indication and not limitative.

Ensuite, lorsque le paramètre de la lumière résiduelle R reçue par le détecteur 34 n'est pas conforme à ce qui a été calculé à partir des données d'émission de la source 18, une anomalie est constatée.Then, when the parameter of the residual light R received by the detector 34 does not conform to what has been calculated from the emission data of the source 18, an abnormality is observed.

L'unité de contrôle 32 commande alors l'émission d'un signal sonore et/ou visuel à l'attention du conducteur du véhicule automobile et/ou réalise une des actions suivantes :

  • l'arrêt de l'émission du rayonnement laser L, ou
  • la diminution de la puissance du rayonnement laser L émis de sorte que le rayonnement laser pouvant sortir du module optique soit un rayonnement laser de classe 2 ou inférieure.
The control unit 32 then controls the emission of an audible and / or visual signal for the attention of the driver of the motor vehicle and / or performs one of the following actions:
  • stopping the emission of laser radiation L, or
  • reducing the power of the emitted laser radiation L so that the laser radiation which can exit the optical module is class 2 or lower laser radiation.

On comprend que ce procédé de commande est similaire pour les différents modes de réalisation du module 12.It will be understood that this control method is similar for the different embodiments of the module 12.

Le module optique 12 peut être utilisé dans le projecteur 10 afin de notamment former un faisceau de croisement, un faisceau de route, un faisceau antibrouillard, un faisceau de route anti-éblouissement ou un faisceau de mauvais temps, appelé AWL conformément au sigle anglais pour « Adverse Weather Light ».The optical module 12 can be used in the headlight 10 in order in particular to form a passing beam, a driving beam, a fog light, an anti-glare driving beam or a bad weather beam, called AWL according to the English acronym for "Adverse Weather Light".

L'invention n'est pas limitée aux modes de réalisation présentés et d'autres modes de réalisation apparaîtront clairement à l'homme du métier.The invention is not limited to the embodiments presented and other embodiments will be apparent to those skilled in the art.

Ainsi, le projecteur 10 peut comprendre un premier module selon l'invention et des deuxième et troisième modules ne comprenant pas de source de lumière laser. Le projecteur 10 peut également comprendre deux modules comprenant chacun au moins une source de lumière laser 18, au moins un système de balayage 20 et au moins un dispositif de conversion du rayonnement en lumière blanche 22 et un troisième module n'en comportant pas. Le projecteur 10 peut également comprendre deux modules. Le cas échéant, le ou les modules sans source laser peuvent avoir une source d'éclairage classique, telle qu'une LED. En outre, on comprend que les modules des premier et deuxième modes de réalisation peuvent comprendre un filtre 40, que les modules des troisième et quatrièmes modes de réalisation peuvent ne pas comprendre de filtre 40, que les modules des deuxième, troisième et quatrième modes de réalisation peuvent comprendre un capteur 42 et que le module du premier mode de réalisation peut ne pas comprendre de capteur 42.Thus, the projector 10 can comprise a first module according to the invention and second and third modules not comprising a laser light source. The projector 10 can also include two modules comprising each at least one laser light source 18, at least one scanning system 20 and at least one device for converting the radiation into white light 22 and a third module not including one. The projector 10 can also include two modules. Where appropriate, the module or modules without a laser source can have a conventional light source, such as an LED. In addition, it is understood that the modules of the first and second embodiments may include a filter 40, that the modules of the third and fourth embodiments may not include a filter 40, that the modules of the second, third and fourth embodiments. embodiment may include a sensor 42 and that the module of the first embodiment may not include a sensor 42.

On comprend également que l'unité de contrôle 32 peut ne pas être d'un seul bloc et que, au sens de l'invention, cet élément comprend différentes parties permettant de réaliser notamment les fonctions de contrôle de la source de lumière 18, de calcul du paramètre de la lumière à recevoir par le détecteur 34, de comparaison de ce paramètre avec le paramètre de la lumière résiduelle R reçue par le détecteur 34 et de commande des actions à réaliser lors de la détection d'une anomalie. Ces différentes parties peuvent cependant être localisées à des emplacements différents dans le véhicule.It is also understood that the control unit 32 may not be a single block and that, within the meaning of the invention, this element comprises different parts making it possible to perform in particular the functions of controlling the light source 18, calculating the parameter of the light to be received by the detector 34, comparing this parameter with the parameter of the residual light R received by the detector 34 and controlling the actions to be carried out when an anomaly is detected. These different parts can however be located at different locations in the vehicle.

Claims (13)

  1. Optical module (12, 14, 16) for a motor vehicle, comprising :
    - at least one light source (18) capable of emitting laser radiation (L),
    - at least one shaping system (20) able to receive the laser radiation (L) and to direct it towards at least one conversion device (22) for converting the laser radiation into white light (B), the conversion device (22) comprising a layer of phosphorescent material and being able to re-emit the white light (B) towards at least one optical system (24), and
    - a detector (34),
    characterised in that the shaping system (20) and the optical system (24) are located on the same side of the conversion device (22), the conversion device thus being used in reflection, and in that the detector (34) is adapted to detect residual light (R) emanating from the light source (18) and coming from the conversion device (22), said residual light (R) being formed by a portion which is reflected unconverted from the laser radiation (L) received by the layer (30) of phosphorescent material of the conversion device (22) and thus being of the same wavelength as the light source (18), the residual light (R) not passing through the optical system (24).
  2. Optical module (12, 14, 16) for a motor vehicle, comprising :
    - at least one light source (18) capable of emitting laser radiation (L),
    - at least one shaping system (20) able to receive the laser radiation (L) and to direct it towards at least one conversion device (22) for converting the laser radiation into white light (B), the conversion device (22) comprising a layer of phosphorescent material and being able to re-emit the white light (B) towards at least one optical system (24), and
    - a detector (34),
    characterised in that the shaping system (20) and the optical system (24) are located on either side of the conversion device (22), the conversion device then being used in transmission, and in that the detector (34) is adapted to detect residual light (R) emanating from the source (18) and coming from the conversion device (22), said residual light (R) being formed by a portion which is transmitted without being converted of the laser radiation (L) received by the layer (30) of phosphorescent material of the conversion device (22) and thus being of the same wavelength as the light source (18), the residual light (R) passing through the optical system (24) and being reflected by the optical system, before reaching the detector.
  3. Module (12, 14, 16) according to the preceding claim, comprising a control unit (32) capable of comparing at least one parameter of the laser radiation (L) emitted by the source (18) with at least one parameter of the residual light (R) received by the detector (34).
  4. A module (12, 14, 16) according to at least one of the foregoing claims, comprising a housing (36) for receiving the conversion device (22), the detector (34) being positioned opposite an opening (38) of the housing (36).
  5. A module (12, 14, 16) according to at least one of the foregoing claims, wherein, the detector (34) is positioned opposite the shaping system (20).
  6. A module (12, 14, 16) according to at least one of the foregoing claims, wherein the detector (34) comprises a photodiode.
  7. A module (12, 14, 16) according to at least one of the preceding claims, comprising a filter (40) arranged between the conversion device (22) and the detector (34).
  8. A module (12, 14, 16) according to at least one of the preceding claims, comprising a temperature measuring sensor (42).
  9. Headlamp (10) for a motor vehicle, characterised in that it comprises at least one optical module (12, 14, 16) according to at least one of the preceding claims.
  10. Motor vehicle, characterized in that it comprises at least one optical module (12, 14, 16) according to at least any one of claims 1 to 8.
  11. A method of controlling an optical module (12, 14, 16) for a motor vehicle according to one of claims 1 to 8, characterised in that it comprises the following steps:
    - a light source (18) emits laser radiation (L) to a shaping system (20),
    - the shaping system (20) directs the laser radiation (L) to a conversion device (22) for converting the radiation into white light (B),
    - the conversion device (22) re-emits the white light (B) to at least one optical system (24), and
    - a detector (34) detects residual light (R) emanating from the source (18) and coming from the conversion device (22), said residual light (R) being formed by a portion which is reflected or transmitted without being converted of the laser radiation (L) received by a layer (30) of phosphorescent material of the conversion device (22).
  12. A method according to claim 11, further comprising the following steps:
    - a control unit (32) calculates at least one parameter of the light to be received by the detector (34) from the laser radiation (L) emitted by the source (18), and
    - the control unit (32) compares the calculated parameter with at least one parameter of the residual light (R) detected by the detector (34).
  13. A method according to the preceding claim, wherein, in the presence of an abnormality of a predetermined type, the control unit (32) controls at least one of the following actions:
    - the emission of an audible and/or visual signal to a driver of the vehicle,
    - stopping the emission of laser radiation (L), and
    - decreasing the power of the laser radiation (L) emitted so that the radiation that can be output from the optical module is a radiation of class 2 or lower.
EP14173410.3A 2013-06-28 2014-06-23 Secure optical module for a motor vehicle including a laser source Active EP2821692B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1356272A FR3007820B1 (en) 2013-06-28 2013-06-28 SECURE OPTICAL MODULE FOR MOTOR VEHICLE COMPRISING A LASER SOURCE

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EP2821692A1 EP2821692A1 (en) 2015-01-07
EP2821692B1 true EP2821692B1 (en) 2020-09-23

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CZ309003B6 (en) 2017-01-24 2021-11-18 Varroc Lighting Systems, s.r.o. Lighting equipment, in particular a projector system for a motor vehicle headlamp
DE102017103087A1 (en) 2017-02-15 2018-08-16 Osram Gmbh Irradiation device with pump radiation unit and conversion element
WO2018150942A1 (en) * 2017-02-15 2018-08-23 パナソニックＩｐマネジメント株式会社 Light source device and light projecting device
DE102017203892A1 (en) * 2017-03-09 2018-09-13 Bayerische Motoren Werke Aktiengesellschaft Lighting device for a motor vehicle
DE102017210517A1 (en) * 2017-06-22 2018-12-27 Osram Gmbh Lighting unit for emitting illumination light
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EP2821692A1 (en) 2015-01-07
FR3007820A1 (en) 2015-01-02

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