DE102014224035A1 - Lighting device - Google Patents

Lighting device

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Publication number
DE102014224035A1
DE102014224035A1 DE102014224035.2A DE102014224035A DE102014224035A1 DE 102014224035 A1 DE102014224035 A1 DE 102014224035A1 DE 102014224035 A DE102014224035 A DE 102014224035A DE 102014224035 A1 DE102014224035 A1 DE 102014224035A1
Authority
DE
Germany
Prior art keywords
light source
semiconductor light
device according
light
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE102014224035.2A
Other languages
German (de)
Inventor
Roland Fiederling
Daniel Weissenberger
Jenny Trommer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Priority to DE102014224035.2A priority Critical patent/DE102014224035A1/en
Publication of DE102014224035A1 publication Critical patent/DE102014224035A1/en
Application status is Pending legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00Arrangements of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00Arrangements or adaptations of optical signalling or lighting devices
    • B60Q1/02Arrangements or adaptations of optical signalling or lighting devices the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04Arrangements or adaptations of optical signalling or lighting devices the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14Arrangements or adaptations of optical signalling or lighting devices the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415Dimming circuits
    • B60Q1/1423Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • B60Q1/143Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16Laser light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/70Prevention of harmful light leakage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/10Indexing codes relating to particular vehicle conditions
    • B60Q2300/14Other vehicle conditions
    • B60Q2300/146Abnormalities, e.g. fail-safe
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/40Indexing codes relating to other road users or special conditions
    • B60Q2300/45Special conditions, e.g. pedestrians, road signs or potential dangers

Abstract

Lighting device for a vehicle having at least one semiconductor light source, wherein a monitoring device is provided, which is adapted to evaluate sensor signals from a sensor device and to control the light emission of the at least one semiconductor light source or the illumination device in dependence on a result of the sensor signal evaluation, so that in the frame the photobiological safety allowable illumination duration is not exceeded.

Description

  • The invention relates to a lighting device according to the preamble of claim 1.
  • HI. State of the art
  • Such lighting devices are for example in the publications DE 10 2011 075147 A1 . WO 2012/007027 A1 . DE 10 2010 011029 A1 and DE 10 2010 028949 A1 such as DE 10 2010 063921 A1 disclosed.
  • A safety concept for so-called LED and laser light functions used in the motor vehicle is based on two pillars, namely internal safety functions of the light sources (detection of escaping laser light by means of internal sensors such as photodiodes) and a beam trap for masking unwanted laser light, for example in a reflector is arranged.
  • Also known are vehicle headlights with manual or automatic switching between low beam and high beam as well as camera-based AFS systems.
  • II. Presentation of the invention
  • It is an object of the invention to provide a generic lighting device, which makes it possible to avoid too intense lighting, especially of people.
  • The photobiological safety of vehicle lights and vehicle headlights with LED or laser light sources must be guaranteed. According to the classification of risk groups IEC 62471: 2006 definitely needs to reach risk group 3 be avoided. It is even the avoidance of risk group 2 desirable. If applicable, further relevant guidelines, for example from the Federal Institute for Occupational Safety and Health, must be taken into account. Here, the distinction between day, night and twilight is to be considered. This topic is particularly relevant in the context of laser light sources and other light sources in which the headlight has a particularly high luminance at the light exit surface. As a further example may be mentioned at this point high-current LEDs and in particular the use of the aforementioned light sources in headlamps with small aperture. Particularly critical in this context are dipped beam and high beam functions, as well as adaptive systems, in particular Advanced Forward Lighting Systems (AFS), and marker light function.
  • The object underlying the invention is achieved by a lighting device having the features of claim 1.
  • The illumination device according to the invention enables compliance with the laser safety class 2 and the Photobiological Safety Class for lamps class 2 in front of the vehicle. The requirement is fulfilled both in the case of a defect-free operating semiconductor light source of the illumination device according to the invention and in the case of a faulty operating semiconductor light source of the illumination device according to the invention.
  • The illumination device according to the invention has at least one semiconductor light source and a monitoring device which is designed to evaluate sensor signals from a sensor device and to control the light emission of the illumination device as a function of a result of the sensor signal evaluation.
  • The illumination device according to the invention preferably makes possible a so-called LARP light function, where the abbreviation LARP stands for Laser Activated Remote Phosphor. The LARP light function is preferably ensured by means of a LARP light source plus downstream optics. The at least one semiconductor light source, which is preferably designed as a laser, and the at least one light wavelength conversion element of the illumination device according to the invention are used as the LARP light source. The LARP light source, that is, the combination of the semiconductor laser light source and the light wavelength conversion element, preferably generates white light having Lambertian light distribution. Preferably, at least one laser diode emitting blue light is used in combination with a phosphor based on YAG: cerium (yttrium aluminum garnet doped with cerium), which proportionally converts the blue light emitted by the at least one laser diode into yellow light, so that the illumination device according to the invention emitting white light which is a mixture of unconverted blue light and converted yellow light. Instead of the at least one semiconductor laser light source and the light wavelength conversion element, however, the illumination device according to the invention may also have one or more light-emitting diodes which emit white light with high luminance.
  • The peak values of the luminances of the aforementioned semiconductor light sources are preferably in the range of greater than 200 cd / mm 2 to 5000 cd / mm 2 . The luminance can be distributed approximately homogeneously over the emission surface or similar to a Gaussian profile.
  • The minimum possible and maximum allowable light levels are in the UN ECE 123 regulated. Here a maximum light intensity of 215000 cd (light emission from the headlamp) is permitted.
  • The limits of permissible radiation with regard to laser safety are in the Standard ICE 60825 regulated.
  • The limits of permissible radiation with regard to photobiological safety are in the CIE S009 / IEC 62471 regulated.
  • The illumination device according to the invention has a monitoring device which is designed in such a way that the brightness of the semiconductor light sources, in particular of the semiconductor laser light sources, can be regulated by means of current regulation or pulse width modulated control (PWM control). For example, the brightness of the high beam can be reduced when a pedestrian is nearby. In addition, for example, the brightness of the low beam can be reduced to a minimum within the law, if due to a very small aperture of the headlamp in the scattered light range above the cut-off of the low beam, the luminance is very high. Furthermore, for example, the light of an AFS system can be hidden from certain angular ranges in which pedestrians are detected or expected.
  • The lighting device according to the invention is also designed such that, alternatively or in addition to the above-mentioned brightness control, a brightness control of the semiconductor light sources or of the semiconductor laser light sources by means of pulsed operation is possible. As a result, it is likewise possible to achieve a lighting duration permissible within the framework of photobiological safety. For example, depending on the environment, in particular on the presence of passers-by and other vehicles, the illumination device or the pulse duration, flash frequency or the duty cycle of the semiconductor light sources of the illumination device according to the invention is made possible by means of the monitoring device of the illumination device according to the invention. As a result, for example, the brightness of a high beam flasher within the city can be regulated.
  • The lighting device according to the invention is preferably designed such that within localities, the maximum pulse duration of the semiconductor light sources or semiconductor laser light sources is 0.25 seconds and a pulse operation of these light sources with a set for the light source type or for the headlight type number of flashes or fixed duty cycle.
  • In particular, the monitoring device of the illumination device according to the invention also detects the following situations:
    In the case of a vehicle in front of a reflective surface, for example in front of a garage wall, or on wet roads, the brightness of the semiconductor light sources of the illumination device according to the invention is reduced in order not to endanger the photobiological safety of the vehicle occupants. In this case, the luminance is detected on the illuminated object for brightness control by means of suitable sensors. In particular, this also takes into account the case that the same surface of the object is illuminated by several vehicles and, accordingly, the luminance on the object is correspondingly higher.
  • Similarly, the brightness of the semiconductor light sources of the illumination device according to the invention is reduced when a person is in the vehicle headlights in front of the vehicle to ensure their photobiological safety. Here, the dwell time of the person in the headlight and the illumination of this person by light from other vehicles can be considered.
  • The brightness control and the pulsed operation of the semiconductor light sources of the illumination device according to the invention can in principle also be used in connection with AFS systems. The illumination device according to the invention preferably has a plurality of so-called micro-LARP modules which can be switched on and off separately and whose brightness and pulsed operation can be regulated separately from one another. In particular, the micro-LARP modules can be controlled differently on both sides of the vehicle. Such a micro-LARP module is in the DE 20 2014 001 375 U1 described.
  • As a system for detecting the environment, cameras (including infrared cameras), infrared scanning, lidar, radar and GPS can be used.
  • The lighting device according to the invention has the advantage that it allows the photobiological safety taking into account a current traffic situation.
  • 1 shows a schematic representation of a vehicle 1 with two vehicle headlights 11 . 12 , in each of which a lighting device according to the invention 110 . 120 is used. The two vehicle headlights or their lighting devices are each to the CAN bus 10 The vehicle is connected to sensor signals from a camera 14 to a monitoring device 13 for the lighting equipment 110 . 120 and control signals (for example, to turn on, turn off, and Dimming) to the designed as a micro-LARP modules light sources of lighting devices 110 . 120 to convey. The camera 14 serves to detect the environment in front of the vehicle.
  • The lighting equipment 110 . 120 each comprise several so-called micro-LARP modules 111 . 112 . 121 . 122 whose structure is in Scripture DE 20 2014 001 375 U1 is described and of which in 1 only two are shown schematically per vehicle headlights.
  • Each micro-LARP module includes a laser diode that generates blue primary light during its operation, and a phosphor element that proportionally converts the primary light to yellow secondary light, and optics so that the micro-LARP module emits white light that is a mixture of blue primary light and yellow secondary light.
  • The aforementioned micro-LARP modules can be operated separately from each other and can be controlled in groups or individually to different light distributions and lighting functions of the vehicle headlights 110 . 120 to realize.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 102011075147 A1 [0003]
    • WO 2012/007027 A1 [0003]
    • DE 102010011029 A1 [0003]
    • DE 102010028949 A1 [0003]
    • DE 102010063921 A1 [0003]
    • DE 202014001375 U1 [0021, 0025]
  • Cited non-patent literature
    • IEC 62471: 2006 [0007]
    • UN ECE 123 [0013]
    • Standard ICE 60825 [0014]
    • CIE S009 [0015]
    • IEC 62471 [0015]

Claims (4)

  1. Lighting device for a vehicle having at least one semiconductor light source, characterized in that a monitoring device is provided, which is adapted to evaluate sensor signals from a sensor device and to control the light emission of the at least one semiconductor light source or the illumination device in dependence on a result of the sensor signal evaluation, so that does not exceed a permissible illumination duration in the context of photobiological safety.
  2. Lighting device according to claim 1, wherein at least one camera for detecting a traffic situation is provided and the monitoring device is adapted to control the brightness of the at least one semiconductor light source depending on the result of an evaluation of a camera signal.
  3. Lighting device according to claim 1 or 2, wherein the at least one semiconductor light source is designed for a pulse operation and the monitoring device is designed to control the pulse operation of the at least one semiconductor light source.
  4. Vehicle headlight with at least one illumination device according to one or more of claims 1 to 3.
DE102014224035.2A 2014-11-25 2014-11-25 Lighting device Pending DE102014224035A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102014224035.2A DE102014224035A1 (en) 2014-11-25 2014-11-25 Lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014224035.2A DE102014224035A1 (en) 2014-11-25 2014-11-25 Lighting device

Publications (1)

Publication Number Publication Date
DE102014224035A1 true DE102014224035A1 (en) 2016-05-25

Family

ID=55914465

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102014224035.2A Pending DE102014224035A1 (en) 2014-11-25 2014-11-25 Lighting device

Country Status (1)

Country Link
DE (1) DE102014224035A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017101130A1 (en) 2017-01-20 2018-07-26 Automotive Lighting Reutlingen Gmbh Motor vehicle headlight, headlamp assembly having at least two such headlights and method for operating such a headlamp assembly
DE102018203068A1 (en) 2018-03-01 2019-09-05 Osram Gmbh Converter, larp system and headlights

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010011029A1 (en) 2010-03-11 2011-09-15 Osram Opto Semiconductors Gmbh Portable electronic device
DE102010028949A1 (en) 2010-05-12 2011-11-17 Osram Gesellschaft mit beschränkter Haftung headlight module
WO2012007027A1 (en) 2010-07-12 2012-01-19 Osram Ag Light emitting device and method for creating a multi-colored light beam
DE102010063921A1 (en) 2010-12-22 2012-06-28 Osram Ag Projection device for projecting at least one image onto a projection surface and corresponding method for operating a projection device
DE102011075147A1 (en) 2011-05-03 2012-11-08 Osram Ag Projection device for projecting at least one picture point and process for operating a projection device
DE202014001375U1 (en) 2014-02-13 2014-02-24 Osram Gmbh Lighting device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010011029A1 (en) 2010-03-11 2011-09-15 Osram Opto Semiconductors Gmbh Portable electronic device
DE102010028949A1 (en) 2010-05-12 2011-11-17 Osram Gesellschaft mit beschränkter Haftung headlight module
WO2012007027A1 (en) 2010-07-12 2012-01-19 Osram Ag Light emitting device and method for creating a multi-colored light beam
DE102010063921A1 (en) 2010-12-22 2012-06-28 Osram Ag Projection device for projecting at least one image onto a projection surface and corresponding method for operating a projection device
DE102011075147A1 (en) 2011-05-03 2012-11-08 Osram Ag Projection device for projecting at least one picture point and process for operating a projection device
DE202014001375U1 (en) 2014-02-13 2014-02-24 Osram Gmbh Lighting device

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
CIE S009
IEC 62471
IEC 62471:2006
Norm ICE 60825
UN ECE 123

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017101130A1 (en) 2017-01-20 2018-07-26 Automotive Lighting Reutlingen Gmbh Motor vehicle headlight, headlamp assembly having at least two such headlights and method for operating such a headlamp assembly
DE102018203068A1 (en) 2018-03-01 2019-09-05 Osram Gmbh Converter, larp system and headlights

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