EP2821692B1 - Gesichertes optisches modul für kraftfahrzeug, das eine laser-lichtquelle umfasst - Google Patents

Gesichertes optisches modul für kraftfahrzeug, das eine laser-lichtquelle umfasst 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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Prior art keywords
conversion device
detector
light
laser radiation
module
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EP14173410.3A
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English (en)
French (fr)
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EP2821692A1 (de
Inventor
Loïc Boinet
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Valeo Vision SAS
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Valeo Vision SAS
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    • 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)

Claims (13)

  1. Optisches Modul (12, 14, 16) für ein Kraftfahrzeug, umfassend :
    - mindestens eine Lichtquelle (18), die in der Lage ist, Laserstrahlung (L) auszusenden,
    - mindestens ein Formgebungssystem (20), das in der Lage ist, die Laserstrahlung (L) zu empfangen und sie auf mindestens eine Umwandlungsvorrichtung (22) zur Umwandlung der Laserstrahlung in weißes Licht (B) zu richten, wobei die Umwandlungsvorrichtung (22) eine Schicht aus phosphoreszierendem Material umfasst und in der Lage ist, das weiße Licht (B) auf mindestens ein optisches System (24) zu reemittieren, und
    - einen Detektor (34),
    dadurch gekennzeichnet, dass das Formgebungssystem (20) und das optische System (24) auf der gleichen Seite der Umwandlungsvorrichtung (22) angeordnet sind, wobei die Umwandlungsvorrichtung somit in Reflexion verwendet wird, und dass der Detektor (34) angepasst ist, um Restlicht (R) zu erfassen, das von der Lichtquelle (18) ausgeht und von der Umwandlungsvorrichtung (22) kommt, wobei das Restlicht (R) durch einen Teil der von der Schicht (30) aus phosphoreszierendem Material der Umwandlungsvorrichtung (22) empfangenen Laserstrahlung (L) gebildet wird, der reflektiert wird, ohne umgewandelt zu werden und somit die gleiche Wellenlänge wie die Lichtquelle (18) hat, wobei das Restlicht (R) nicht durch das optische System (24) hindurchgeht.
  2. Optisches Modul (12, 14, 16) für ein Kraftfahrzeug, umfassend :
    - mindestens eine Lichtquelle (18), die in der Lage ist, Laserstrahlung (L) auszusenden,
    - mindestens ein Formgebungssystem (20), das in der Lage ist, die Laserstrahlung (L) zu empfangen und sie auf mindestens eine Umwandlungsvorrichtung (22) zur Umwandlung der Laserstrahlung in weißes Licht (B) zu richten, wobei die Umwandlungsvorrichtung (22) eine Schicht aus phosphoreszierendem Material umfasst und in der Lage ist, das weiße Licht (B) auf mindestens ein optisches System (24) zu reemittieren, und
    - einen Detektor (34),
    dadurch gekennzeichnet, dass das Formgebungssystem (20) und das optische System (24) auf beiden Seiten der Umwandlungsvorrichtung (22) angeordnet sind, wobei die Umwandlungsvorrichtung dann in der Transmission verwendet wird, und dass der Detektor (34) geeignet ist, Restlicht (R) zu erfassen, das von der Lichtquelle (18) ausgeht und von der Umwandlungsvorrichtung (22) kommt, wobei das Restlicht (R) durch einen Teil der von der Schicht (30) aus phosphoreszierendem Material der Umwandlungsvorrichtung (22) empfangenen Laserstrahlung (L) gebildet wird, der durchgelassen wird ohne umgewandelt zu werden, und somit von derselben Wellenlänge wie die Lichtquelle (18) ist, wobei das Restlicht (R) durch das optische System (24) hindurchgeht und von dem optischen System reflektiert wird, bevor es den Detektor erreicht.
  3. Modul (12, 14, 16) nach dem vorhergehenden Anspruch, umfassend eine Steuereinheit (32), die in der Lage ist, mindestens einen Parameter der von der Lichtquelle (18) emittierten Laserstrahlung (L) mit mindestens einem Parameter des von dem Detektor (34) empfangenen Restlichts (R) zu vergleichen.
  4. Modul (12, 14, 16) nach mindestens einem der vorstehenden Ansprüche, mit einem Gehäuse (36) zur Aufnahme der Umwandlungsvorrichtung (22), wobei der Detektor (34) gegenüber einer Öffnung (38) des Gehäuses (36) angeordnet ist.
  5. Ein Modul (12, 14, 16) gemäß mindestens einem der vorstehenden Ansprüche, wobei der Detektor (34) gegenüber dem Formgebungssystem (20) positioniert ist.
  6. Modul (12, 14, 16) nach mindestens einem der vorstehenden Ansprüche, wobei der Detektor (34) eine Fotodiode umfasst.
  7. Modul (12, 14, 16) gemäß mindestens einem der vorstehenden Ansprüche, mit einem Filter (40), der zwischen der Umwandlungsvorrichtung (22) und dem Detektor (34) angeordnet ist.
  8. Ein Modul (12, 14, 16) nach mindestens einem der vorstehenden Ansprüche, das einen Temperaturmesssensor (42) umfasst.
  9. Scheinwerfer (10) für Kraftfahrzeuge, dadurch gekennzeichnet, dass er mindestens ein optisches Modul (12, 14, 16) nach mindestens einem der vorstehenden Ansprüche umfasst.
  10. Kraftfahrzeug, dadurch gekennzeichnet, dass es mindestens ein optisches Modul (12, 14, 16) nach mindestens einem der Ansprüche 1 bis 8 umfasst.
  11. Verfahren zur Steuerung eines optischen Moduls (12, 14, 16) für ein Kraftfahrzeug nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    - eine Lichtquelle (18) emittiert Laserstrahlung (L) zu einem Formgebungssystem (20),
    - das Formgebungssystem (20) die Laserstrahlung (L) auf eine Umwandlungsvorrichtung (22) zur Umwandlung der Strahlung in weißes Licht (B) lenkt,
    - die Umwandlungsvorrichtung (22) das weiße Licht (B) wieder an mindestens ein optisches System (24) abgibt, und
    - ein Detektor (34) Restlicht (R) detektiert, das von der Lichtquelle (18) ausgeht und von der Umwandlungsvorrichtung (22) kommt, wobei das Restlicht (R) durch einen Teil der von einer Schicht (30) aus phosphoreszierendem Material der Umwandlungsvorrichtung (22) empfangenen Laserstrahlung (L) gebildet wird, der reflektiert oder durchgelassen wird, ohne umgewandelt zu werden.
  12. Ein Verfahren nach Anspruch 11, das ferner die folgenden Schritte umfasst:
    - eine Steuereinheit (32) berechnet mindestens einen Parameter des von dem Detektor (34) zu empfangenden Lichts aus der von der Lichtquelle (18) emittierten Laserstrahlung (L), und
    - die Steuereinheit (32) den berechneten Parameter mit mindestens einem Parameter des von dem Detektor (34) erfassten Restlichts (R) vergleicht.
  13. Verfahren nach dem vorstehenden Anspruch, bei dem bei Vorliegen einer Anomalie eines vorbestimmten Typs die Steuereinheit (32) mindestens eine der folgenden Aktionen steuert:
    - die Abgabe eines akustischen und/oder optischen Signals an einen Fahrzeugführer,
    - das Stoppen der Emission von Laserstrahlung (L), und
    - Verringerung der Leistung der emittierten Laserstrahlung (L), so dass die Strahlung, die von dem optischen Modul ausgegeben werden kann, eine Strahlung der Klasse 2 oder niedriger ist.
EP14173410.3A 2013-06-28 2014-06-23 Gesichertes optisches modul für kraftfahrzeug, das eine laser-lichtquelle umfasst Active EP2821692B1 (de)

Applications Claiming Priority (1)

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FR1356272A FR3007820B1 (fr) 2013-06-28 2013-06-28 Module optique securise pour vehicule automobile comprenant une source laser

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EP2821692B1 true EP2821692B1 (de) 2020-09-23

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DE102017103087A1 (de) 2017-02-15 2018-08-16 Osram Gmbh Bestrahlungsvorrichtung mit Pumpstrahlungseinheit und Konversionselement
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EP2821692A1 (de) 2015-01-07
FR3007820A1 (fr) 2015-01-02

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