EP1818602A2 - Beleuchtungsscheinwerfer für Kraftfahrzeuge - Google Patents

Beleuchtungsscheinwerfer für Kraftfahrzeuge Download PDF

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Publication number
EP1818602A2
EP1818602A2 EP07290136A EP07290136A EP1818602A2 EP 1818602 A2 EP1818602 A2 EP 1818602A2 EP 07290136 A EP07290136 A EP 07290136A EP 07290136 A EP07290136 A EP 07290136A EP 1818602 A2 EP1818602 A2 EP 1818602A2
Authority
EP
European Patent Office
Prior art keywords
light
stop
cache
rotation
type
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.)
Granted
Application number
EP07290136A
Other languages
English (en)
French (fr)
Other versions
EP1818602A3 (de
EP1818602B1 (de
Inventor
Nicolas Louvet
Alexandre Mensales
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP1818602A2 publication Critical patent/EP1818602A2/de
Publication of EP1818602A3 publication Critical patent/EP1818602A3/de
Application granted granted Critical
Publication of EP1818602B1 publication Critical patent/EP1818602B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/698—Shaft-shaped screens rotating along its longitudinal axis

Definitions

  • the invention generally relates to a motor vehicle headlamp comprising a light cache mechanism having at least two rotating light caps to respectively produce at least two different beams of light.
  • the invention relates to a dual-function projector capable of producing light beams of code and route for the two traffic modes on the right and traffic on the left.
  • a stepper motor is an actuator that remains relatively expensive and requires a suitable electronics, capable of generating the various impulse signals necessary for its control.
  • the problem of the loss of pitch is likely to introduce inaccuracy in the angular positioning of the covers which requires the implementation of special provisions for periodically referencing the angular position of the axis of the stepper motor.
  • the main purpose of the invention is to provide a technical alternative to the use of a stepper motor in this type of projector.
  • the motor vehicle headlight according to the invention comprises a light-shielding mechanism having at least first and second rotatable light caps for respectively producing at least first and second different light beams.
  • the mechanical indexing means is chosen from a retractable abutment or other mechanical means of the type roller, blasting, spring, spring latch.
  • the term "rest position” is understood to mean the position towards which the cover naturally returns, especially in the event of failure of its actuating means. This is usually a position where the emitted beam is a cut-off beam (as opposed to an unbroken beam of the road type).
  • the cache mechanism also comprises, according to one embodiment, at least a first stop determining at least a first angular position of rotation stop cache, the stop being retractable and able to allow a crossing of the first angular stop position in cache rotation by at least one of the first and second light caches when a lighting mode switching is controlled in the projector; and an actuator adapted to rotate said first and second light caps in two directions of rotation.
  • the light cache mechanism also includes resilient means for causing and maintaining a light shield in the first rotational stopping angular position when the actuator is inactive.
  • the light cache mechanism includes first and second light caches having profiles. respective ones capable of producing the light beams with code-type cutoff; and the first retractable stopper determines angular positions of the first and second covers for the production of the code-cut light beams.
  • the light cache mechanism also comprises at least a second fixed-type stopper defining at least a second cache-stopping angular position for the production of a road-type light beam.
  • the light cache mechanism comprises two fixed second stops located on either side of the retractable stop with predetermined angular offsets and preferably symmetrically, and each second fixed stop determines a second respective rotational stop angular position for each of the first and second covers, for producing a road-type light beam.
  • the retractable stop is elastic and flexes to allow a crossing of the first angular position by a light cover when a mechanical torque greater than a maximum threshold torque is applied against the retractable stop.
  • the actuator comprises a DC motor and an electronic control circuit capable of controlling the motor in two directions of rotation.
  • the electronic control circuit is advantageously equipped with electric current limiting means for limiting an electric current flowing in the motor when the latter is in a locked torque operating state.
  • the invention also relates to a motor vehicle equipped with at least one projector (the unitary optical module or the complete projector) according to the invention.
  • a third beam of the road type is also proposed, so as to obtain a tri-function optical module, which will correspond to a position of the mechanism of caches that it does not hide the rays emitted by the source directly or after reflection on the associated reflector.
  • FIGS. 1A to 1B and 2 a particular embodiment of the invention is now described in the form of a dual-function code / route projector, globally marked 1, capable of automatically switching between a control mode. traffic flow on the right and a traffic flow pattern on the left.
  • the projector 1 described here is intentionally shown in a simplified manner in Figs.1A to 1B to facilitate understanding of the invention.
  • the projector 1 is of elliptical type and is designed to emit a beam of illumination light along an optical axis AA passing through foci F1 and F2.
  • the projector 1 essentially comprises a light source 10 located at a focus F1 of the headlamp 1, an elliptical reflector 11, a lens 12 and a light cache mechanism 13.
  • the light source 10, the reflector 11 and the lens 12 are known elements, similar to those usually included in such a lighting projector for a motor vehicle. For this reason, these elements 10, 11 and 12 will not be detailed here.
  • the cover mechanism 13 is located substantially at the focal point F2 of the projector 1.
  • the cover mechanism 13 essentially comprises two integrally formed covers 130D and 130G 130, a motor actuator 131, a return spring 132 and three stops 133, 133D and 133G.
  • the stops 133D and 133G are located on either side of the stop 133, with determined angular offsets, preferably symmetrically.
  • the cache 130D is provided with a profile able to introduce a code-like break in the traffic flow mode on the right TD.
  • Cache 130G is provided with a profile capable of introducing a code-like break in the left traffic traffic mode TG.
  • the motor actuator 131 controls rotations of the cover piece 130 around an axis PP perpendicular to the optical axis AA (Fig.1) of the projector 1.
  • the actuator 131 essentially comprises an electric motor 1310 and an electronic control circuit 1311.
  • the motor 1310 is preferably a DC motor.
  • the electronic circuit 1311 controls the operation of the motor 1310 as a function of two input signals, namely, a C / R code / route mode control signal and a right / traffic traffic mode control signal. left TD / TG.
  • the circuit 1311 is powered by a DC voltage V and outputs a control voltage VM whose polarity is variable so as to control the direction of rotation of the motor 1310.
  • Figs. 1A, 1B and 3A show the headlamp 1 in states corresponding to the traffic flow mode on the right TD.
  • the projector 1 is in the code illumination mode, in TD traffic. This state corresponds to the time interval t1 shown in FIG.
  • the control voltage VM is at 0 volts and the motor 1310 then exerts no torque on the cover piece 130.
  • a return torque Cr is instead exerted by the spring 132 in the clockwise direction SH of such way that the cover 130D is held in abutment against the stop 133.
  • the stop 133 is of the retractable type.
  • a resilience property is imparted to the abutment 133 in such a manner as to make it retractable.
  • the function of the stop 133 can be carried out so different by the skilled person. For example, in the form of a sliding stop actuated by an electromagnet.
  • the stop 133 no longer fulfills its function of stopping rotation of the cover piece 130 when the torque Cc applied to the cover piece 130 is greater than a maximum threshold threshold Cm of determined value.
  • a maximum threshold threshold Cm of determined value the mechanical force applied to the stop 133 by the cover 130D or 130G resting against it causes the stopper 133 to bend by elasticity. The bending of the stop 133 is then sufficient to release the piece of cover 130 and allow a continuation of the rotation thereof after crossing the stop 133.
  • the restoring torque Cr due to the spring 132 is less than the maximum threshold torque Cm and the stop 133 then fully fulfills its function of stopping the rotation of the cover 130 by contacting the cover 130D against it (see Fig.3A).
  • Fig.1B shows the projector 1 in the road lighting mode, still in TD traffic. This state corresponds to the time interval t2 shown in FIG.
  • the control voltage VM then has a value -Vm capable of producing a rotation torque of the motor 1310 in the inverse clockwise direction SHi.
  • the voltage VM -Vm is maintained in order to oppose the return torque Cr exerted by the spring 132 and to keep the cache piece 130 in the state shown in FIG. 1B.
  • the locked torque state occurs when the cover piece 130 comes into contact with the stop 133D in the TD traffic mode or the stop 133G in the TG traffic mode.
  • the time interval t3 corresponds to switching from the projector 1 to the left-hand traffic mode TG.
  • the motor 1310 then provides a mechanical torque in the clockwise direction SH which is added to the torque Cr exerted by the spring.
  • the torque Cc applied to the cover piece 130 then takes a value which is greater than the torque Cm such that the retractable stop 133 flexes sufficiently and no longer impedes the rotation of the cover piece 130 which comes into the state shown in Fig.1C.
  • the voltage VM must retain the value + Vm for a time sufficient to allow crossing of the stop 133 by the two screens 130D and 130G, as shown in FIG. Fig.1C.
  • the voltage VM can be brought back to 0 Volt to come into the code illumination mode in TG traffic or maintained at + Vm to come in the road lighting mode in TG traffic.
  • Figs. 1C and 3B the projector 1 is shown in the code illumination mode, in TG traffic. This state corresponds to the time interval t4 shown in FIG.
  • the control voltage VM is at 0 volts and the motor 1310 then exerts no torque on the cover piece 130.
  • the restoring torque Cr is instead exerted by the spring 132 in the reverse clockwise direction SHi of such that the cover 130G is held in abutment against the stop 133, more precisely against a contact face of the stop 133 which is opposite to that serving to support the cache 130D in the TD traffic mode.
  • the abutment 133 operates here in the same manner as described above with respect to the TD traffic flow mode and is also retractable for switching from the traffic flow mode TG to the traffic circulation mode TD.
  • Fig.1D shows the headlamp 1 in the road lighting mode, always in TG traffic. This state corresponds to the time interval t5 shown in FIG.
  • the control voltage VM then has a value + Vm able to produce a rotation torque of the motor 1310 in the clockwise direction SH.
  • the voltage VM + Vm is maintained in order to oppose the return torque Cr exerted by the spring 132 and to keep the cache piece 130 in the state shown in FIG.
  • the limitation of the current of the motor 1310 is here also provided to prevent deterioration thereof in locked torque.
  • the time interval t6 shown in Fig.2 corresponds to the switching of the projector 1 to the traffic flow mode on the right TD, in order to return to the state of the time interval t1 or t2.
  • the operation of this switching is similar to that described above for switching from TD mode to TG mode and will not be detailed here.
  • the stops 133, 133D and 133G determine different angular positions of rotation stop caches.
  • the retractable stop 133 with its opposite contact faces determine two angular positions, one for the 130D cover and one for the 130D cover, these angular positions corresponding to TD traffic mode code illumination and TG traffic mode code illumination.
  • the fixed stops 133D and 133G determine two angular road illumination positions for the 130D and 130G caches, one for the TD traffic mode and the other for the TG traffic mode.
  • the skilled person may not use a DC motor for the rotation of the cover piece 130 but use for example other types of actuator such as a stepper motor or an electromagnet.
  • a stepper motor the presence of stops in accordance with the invention will bring a greater robustness of the angular positioning of the piece of cache, for example by allowing referencing in case of loss of step .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP07290136.6A 2006-02-14 2007-02-01 Beleuchtungsscheinwerfer für Kraftfahrzeuge Not-in-force EP1818602B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0601296A FR2897415B1 (fr) 2006-02-14 2006-02-14 Projecteur d'eclairage pour vehicules automobiles.

Publications (3)

Publication Number Publication Date
EP1818602A2 true EP1818602A2 (de) 2007-08-15
EP1818602A3 EP1818602A3 (de) 2009-06-03
EP1818602B1 EP1818602B1 (de) 2015-03-25

Family

ID=37027760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07290136.6A Not-in-force EP1818602B1 (de) 2006-02-14 2007-02-01 Beleuchtungsscheinwerfer für Kraftfahrzeuge

Country Status (4)

Country Link
US (1) US7568825B2 (de)
EP (1) EP1818602B1 (de)
JP (1) JP2007220676A (de)
FR (1) FR2897415B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2169299A1 (de) * 2008-09-30 2010-03-31 Valeo Vision Optisches Modul für ein Kraftfahrzeug, das selektiv eine Zone beleuchten kann

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5074888B2 (ja) * 2007-11-02 2012-11-14 株式会社小糸製作所 車両用ランプシステム
JP2011181233A (ja) * 2010-02-26 2011-09-15 Koito Mfg Co Ltd 車両用前照灯
DE102010045435B4 (de) * 2010-09-15 2019-10-10 HELLA GmbH & Co. KGaA Projektionsscheinwerfer für Fahrzeuge
DE202011005617U1 (de) * 2011-04-27 2011-06-27 Automotive Lighting Reutlingen GmbH, 72762 Lichtmodul eines Kraftfahrzeugscheinwerfers
DE202012003108U1 (de) * 2012-03-28 2013-01-29 Automotive Lighting Reutlingen Gmbh Projektionslichtmodul mit einer verstellbaren Blende
DE102012210157A1 (de) * 2012-06-15 2013-12-19 Robert Bosch Gmbh Verfahren und Vorrichtung zum Betreiben eines Scheinwerfers für ein Kraftfahrzeug
DE102019118590A1 (de) * 2019-07-09 2021-01-14 Automotive Lighting Reutlingen Gmbh Lichtmodul eines Kraftfahrzeugscheinwerfers und Kraftfahrzeugscheinwerfer mit einem solchen Lichtmodul

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854941A1 (fr) 2003-05-16 2004-11-19 Valeo Vision Dispositif projecteur avec plaque pivotante, notamment pour vehicule automobile

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US1658679A (en) * 1927-06-04 1928-02-07 Ben J Hill Headlight dimmer
US1834542A (en) * 1929-04-23 1931-12-01 Karlebo Karl Birger Dimming device for headlights for automobiles and the like
JPH0431169Y2 (de) * 1986-12-12 1992-07-27
US4991063A (en) * 1990-06-18 1991-02-05 Eastman Kodak Company Photographic flash apparatus
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JPH04293631A (ja) * 1991-03-22 1992-10-19 Stanley Electric Co Ltd ４灯式前照灯
JP2765643B2 (ja) * 1992-06-03 1998-06-18 株式会社小糸製作所 投射型自動車用ヘッドランプ
DE4243174C2 (de) * 1992-12-19 2002-06-27 Bosch Gmbh Robert Kraftfahrzeugscheinwerfer mit einer verstellbaren Blendenanordnung
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Publication number Priority date Publication date Assignee Title
FR2854941A1 (fr) 2003-05-16 2004-11-19 Valeo Vision Dispositif projecteur avec plaque pivotante, notamment pour vehicule automobile

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2169299A1 (de) * 2008-09-30 2010-03-31 Valeo Vision Optisches Modul für ein Kraftfahrzeug, das selektiv eine Zone beleuchten kann
FR2936591A1 (fr) * 2008-09-30 2010-04-02 Valeo Vision Sas Module optique pour vehicule automobile apte a eclairer selectivement une zone
US8348485B2 (en) 2008-09-30 2013-01-08 Valeo Vision Optical module for a motor vehicle capable of selectively lighting a zone
EP3045806A1 (de) * 2008-09-30 2016-07-20 Valeo Vision Optisches modul für ein kraftfahrzeug, das selektiv eine zone beleuchten kann

Also Published As

Publication number Publication date
EP1818602A3 (de) 2009-06-03
EP1818602B1 (de) 2015-03-25
FR2897415A1 (fr) 2007-08-17
US7568825B2 (en) 2009-08-04
FR2897415B1 (fr) 2008-04-11
JP2007220676A (ja) 2007-08-30
US20080180966A1 (en) 2008-07-31

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