FR2788329A1 - VEHICLE HEADLIGHT FOR EMITTING DIFFERENT LIGHT BEAMS - Google Patents

Abstract

Headlamp for emitting different beams comprising a reflector (10) and a light source (12) carried by an adjustment device (28), movable relative to the reflector (10) between an end position for the low beams, the light being reflected by the reflector (10) downwards, with an asymmetrical chiaroscuro limit and with a maximum of lighting intensity, and a position in which the light is reflected in the form of a beam of light with a another range and another maximum of light intensity. In this other position, the source (12) is arranged by the adjustment device (28) to reflect the light by the reflector (10) in the form of a beam. range and intensity of lighting lower than in the case of low beam.

Description

State of the art

  The invention relates to a headlight for vehicles

  before emitting different beams of light comprising a reflector and a light source, which can be moved by an adjustment device with respect to the reflector between a terminal position for the dipped beam, in

  which the light emitted by the light source is reflected

  shit by the reflector in the form of a beam of light

  for dipped-beam headlights, with a line

  asymmetrical chiaroscuro mite and with maximum deter-

  mined lighting intensity, and at least one other position, in which the light emitted by the light source is reflected by the reflector in the form of a beam of light with another range and another maximum of intensity lighting than in the case of the light beam for the

headlights.

  Such a lighthouse is known from the document DE-

  44 35 507 Ai. This headlight is used to emit a beam of light for low beam or a beam of light for high beam. The lighthouse has a reflector and a source of

  light, movable relative to the reflector by means of a

  positive adjustment between an end position for low beam and a final position for high beam. In the

  end position of the light source for low beam

  The light emitted from the light source is

  reflected by the reflector as a beam of light pre-

  feeling a maximum of lighting intensity tilted downwards and a limited maximum of lighting intensity, a beam which has an asymmetrical chiaroscuro limit, for

  avoid blindness of oncoming traffic.

  In the final position of the high beam light source the light emitted from the light source is reflected by the reflector in the form of a beam of

  light that goes far and produces a high maximum of intensity

  lighting site. The beam of light emitted by the headlight with the light source in its end position for low beam with a determined characteristic,

  that is to say a range and a maximum intensity of light

  rage, does not allow optimal lighting in all climatic conditions. To improve the lighting, in particular in the event of fog, heavy rain, or snowfall, fog lights are known for example, which however usually require having a reflector.

  clean light source. The anti lighthouse

  fog also requires additional space,

  which is limited to the vehicle in certain circumstances.

  Advantages of the invention To overcome these drawbacks, the headlight according to the invention is characterized in that in at least this other position, the light source is arranged by the adjustment device, in such a way that the light emitted by the latter is reflected by the reflector in the form of a light beam with a lower range and a lower maximum light intensity than

  in the case of the light beam for the dipped beam-

is lying.

  The headlight according to the invention for vehicles,

  before emitting different beams of light, thus has the advantage that it is possible thanks to the movement of the light source to have the emission either of a beam of light for low beam or of another beam of light with a reduced range and a maximum of reduced lighting intensity, without it being necessary to have a

  additional light source or suitable mounting space

  additional. According to other advantageous configurations of the invention: the light source is moved from its end position for the low beams to its other position, away from the top of the reflector and upwards,

  - the beam of light emitted by the lighthouse in the other posi-

  tion of the light source has a horizontal chiaroscuro limit from end to end,

  - the beam of light emitted by the lighthouse in the other posi-

  tion of the light source has a ho- dispersion

  steeper than the beam of low beam emitted by the headlight with the source in the low beam position, - in the other position of the light source, the reflector is moreover pivoted with a in such a way that the beam of light reflected by it has a greater downward inclination than

  the beam of light for the dipped beam, reflected

  chi by the reflector in the end position of the

  light source for low beam.

  The configuration allows a modification of the characteristic of the light beam, that is to say its range and the maximum of its lighting intensity, between that of the light for the dipped beam and that of

the other beam of light.

  This is achieved by the fact that the source of lu-

  can be moved to at least one intermediate position

  diary between its terminal position for the

crossing and its other position.

  The development makes it possible to produce, with a headlight having a light source, three lighting functions for the light of the dipped beam, for the other beam of

light and for high beam.

  This is obtained by the fact that one can in addition

  move the light source by means of the re-

  leveling from its end position for the dipped beam, opposite to that in which the movement of the light source takes place in its other position, in at least one end position for the main beam, in which the light emitted by this source is reflected by the reflector in the form of a beam of light for high beam with a greater range and a higher maximum of the intensity of lighting than in the case of the beam

  of light for the low beam.

  In this case, the light source can be turned off.

  placed in at least one intermediate position between its po-

  end position for the dipped beam headlamps and its position

final for high beam.

  The configuration allows a modification of the characteristic of the light beam, that is to say its range and the maximum of its lighting intensity, between that of the light beam for the dipped beam and that of the light beam for high beam. Drawing The present invention will be described below in more detail from an embodiment, shown in the accompanying drawings, in which: - Figure 1 shows a lighthouse in a longitudinal section

  vertical with a light source in different po-

sitions,

  - Figure 2 shows a measurement screen when it is lit -

  rage by the light beam emitted by the headlight with the light source in a terminal position for low beam, - Figure 3 shows the measurement screen when illuminated by the light beam emitted by the headlight with the source of light in another final position, and - Figure 4 shows the measurement screen when illuminated by the light beam emitted by the headlight with the light source in a final position for high beam.

  Description of the exemplary embodiment

  Uh headlight shown in Figure 1 for vehicles, in particular for motor vehicles, is used to alternately emit different beams of light; The headlight has a reflector 10 and a light source 12, which is for example a gas discharge lamp, but which can also be an incandescent lamp. The reflector 10 with the light source 12 is placed in a support or a

  housing 14 adjustable. The light outlet

  case 14 is covered by a transparent glass 16 made of glass or plastic, which can be made

  like smooth ice, or which may have op-

  ticks, ice through which light is deflected and / or scattered. The reflector 10 can be made of metal or plastic and has in the region of its top a

  orifice 18 for the light source 12.

  The light source 12 is held in a lamp holder 20, mounted so as to be able to pivot at least indirectly on the reflector 10 around an axis 22,

  roughly horizontal, and passing near the upper edge

  lamp holder laugher 20. The light source 12 is formed during its operation by an electric arc 24,

  in its bulb which passes through the orifice 18 of the reflective

  so that the light emitted by its electric arc

  sheet 24 is reflected by the concave reflecting surface of the reflector 10. With the light source 12 can be associated a screen device 26, by means of which a part of the light emitted by the light source 12 is stopped, so that that this does not arrive on the reflector 10. By means of the device 26 forming a screen, it is possible to produce a limit of chiaroscuro of the beam of light leaving the

  headlight. On the lamp holder 20 is engaged in an ex-

  centered with respect to the pivot axis 22 an adjustment device 28, by means of which the lamp holder can be pivoted about the axis 22. The adjustment device 28 can

  for example presenting an electric motor 30, which

  smooth by means of a transmission a rod 32 engaged on

  the lamp holder 20. The electric motor is preferably

  rence realized in the form of a stepper motor. The availability

  adjustment sitive may alternatively have an electromagnet which ensures translation of the rod 32 engaging on

  the lamp holder 20. Another variant can also present

  ter the adjusting device 28 by a hydraulic or pneumatic drive system ensuring the translation of the rod

  32 engaged on the lamp holder 20.

  You can move, thanks to the adjustment device

  28, the lamp holder 20 and the light source 12 now

  naked in it between a terminal position for the low beam and at least one other position. At least one of the other positions of the light source 12 is determined

  so as to obtain under unfavorable climatic conditions

  bles such as for example fog, rain or

  snow, better lighting than with the light beam

  material for low beam. Hereinafter, this other at least unique position of the light source 12 is simplified by designating it as fog light, also including in this sense the other climatic conditions previously mentioned. We can also provide at least this other position of the light source for example for circulation in

city.

  In Figure 1 there is shown the lamp holder 20 and the light source 12 in solid lines in their position for the low beam. The support of

  lamp 20 can be in this case pressing against a bu-

  tee 34, with which we ensure the exact arrangement of the light source 12 relative to the reflector 10, like that which is necessary for the dipped beams. The light source 12 is arranged relative to the reflector in such a way that the light emitted from its electric arc 24 by the reflector 10 is reflected in the form of a downwardly inclined beam of light, a beam of light which has an asymmetrical upper limit of chiaroscuro, produced by the screen device 26

  or by the corresponding shape of the reflector 10.

  FIG. 2 shows a measurement screen.

  sure 80 arranged at a certain distance in front of the headlight, measurement screen which is illuminated by the beam of light emitted by the headlight when it is in the operating position for the low beam. The measurement screen 80 has a plane, a horizontal median plane HH and a vertical median plane VV, which intersect at the point HV. The lighthouse is designed in the case shown for right-hand traffic. The measurement screen 80 is illuminated in an area 82 by the beam of light for low beams reflected by

  the reflector 10. The glass 16 may have op-

  ticks by means of which the light beam reflected by the reflector 10 is deflected or scattered to illuminate the area

  82. As a variant, the glass 16 can also be made up of

  smooth lesson, the shape of the reflector 10 being then determined

  so that the beam of light reflected by it

  this lights up area 82. this one. Zone 82 is limited to

  the top by the limit of chiaroscuro which presents on the co-

  tee of oncoming traffic, i.e. the left side of the measurement screen 80, a horizontal section 83,

  and which presents on its own side of circulation, that is to say

  say the right side of the screen 80, a rising section 84, which starts from the horizontal section 83. The horizontal section 83 of the chiaroscuro limit extends over approximately 1%, corresponding approximately to 0 , 57 below the horizontal median plane HH of the measurement screen. The horizontal section 84 of the chiaroscuro limit rises at an angle of approximately with respect to the horizontal median plane HH. The distribution

  of the light intensity in zone 82 is material-

  sée by several lines 85 of the same lighting intensity, so-called isolux lines. In the zone 82 we have in a zone 86 very close below the limit of chiaroscuro and a little to the right of the vertical median plane WVV of the measurement screen 80 the highest intensity of lighting, which reaches for example 40 to 50 lux. Towards the edges of zone 82, the intensity of the lighting gradually decreases. Zone 82 has up to the line corresponding to 1 Lux in the vertical direction a range of approximately 8 below the horizontal median plane HH, up to approximately 3 above the horizontal median plane HH. In the horizontal direction, the zone 82 has an extent of approximately 30 to 40 on both sides of the median plane

vertical VV.

  In FIG. 1, the lamp support 20 is shown

  felt with light source 12 by dashed lines

  in the final position for the fog lights, posi-

  tion in which the lamp holder 20 has been pivoted

  relative to its end position for the dipped beam-

  counterclockwise. Source

  of light 12 is moved away from the top of the reflector 10 and

  placed upwards in its final position for fog lights compared to its final position for low beam. The lamp holder 20 can be, in the final position for the fog lights, again in

  support on a stop 36. The electric arc of the light source

  12 in the final position for the fog lights is designated in Figure 1 by the reference 24 '. Thanks to the modified arrangement of the light source 12 with respect to the reflector 10, the light emitted by the light source

  12 is reflected by the reflector 10 with another characteristic

  that of the arrangement of the light source 12 in its terminal position for low beam. FIG. 3 shows the measurement screen 80 during

  illumination by the beam of light reflected by the

  flector 10 with the light source 12 in its fixed position

  nale for fog lights. An area 88 is illuminated by the fog light beam, area in which several isolux lines 89 are shown to materialize the distribution of the lighting intensities. In zone 88 there is in zone 90 the highest intensity of lighting, which however is weaker compared to

  the lighting intensity in zone 87 of zone 82 and at-

  dyed for example around 20 to 40 lux. The area 88 is bounded upwards by a horizontal limit of chiaroscuro 91, which extends over approximately 2% corresponding to approximately 1.140 below the horizontal median plane HH. The zone 88 has in the vertical direction an extent of about 13 or 12 below the horizontal median plane HH to about 1.14 below the horizontal median plane HH. In the horizontal direction, the extent of the zone 88 is roughly the same as that of the zone 82 and reaches on both sides of the vertical median plane W up to approximately 30 to 40. The area 88, lit by the fog light beam, is moved relative to the area 82, lit by the light beam for the dipped beams, downwards and has the symmetrical chiaroscuro limit 91 instead of the asymmetrical limit

of chiaroscuro 83, 84.

  We can plan to rotate the support

  lamp 20 with light source 12 only between the po-

  position for low beam and end position

  for fog lights, by not providing a posi-

  defined intermediate actions. Alternatively we can do

  also vote the lamp holder 20 with the light source

  12 continuously or in one or more positions

  intermediates defined between the end position for the dipped beam headlights and the final position for the fog lights. The farther the light source 12 is from its end position for the low beams, the more it

  is arranged near its final position for the anti-fires

  fogs, the greater the area reflected by the reflector 10 approaches the measurement screen 80 of the area 88 illuminated by the beam of fog light. The area of the measurement screen 80, illuminated by the beam of light reflected by the reflector 10, is during this pivoting of the lamp support 20 disposed more and more deeply and has a

  maximum lighting intensity which becomes lower.

  In addition to the previously described pivoting of the sup-

  lamp port 20 with light source 12 through the

  positive setting 28 you can also rotate around a

  horizontal axis 40 the entire reflector 10 with the support

  lamp port 20 and the light source 12 starting from its position for the low beams, so that the light beam reflected by the reflector 10 presents

  a stronger downward inclination than the beam of lu-

  best for low beam. For this another provision

  adjustment adjuster 42 engages the reflector 10 eccentrically to the axis 40, another adjustment device 42 by which the reflector can be pivoted about the axis 40. Preferably it can be used as a adjustment 42 the adjustment device provided in the case of a headlight range adjustment system, which is provided on the headlight, to compensate in the position for the dipped beams the range of the light beam for the dipped beams in the case of changes in the range of lighting occurring when the load varies and / or

  during other modifications of the inclination,

  vote the reflector 10 around the axis 40.

  According to a development of the headlight, provision may also be made to pivot the lamp support 20 with the light source, starting from the end position for the low beams in at least one final position for the high beams. The pivoting of the lamp holder 20 with the light source 12 in the final position for the main beams takes place starting from the terminal position for the dipped beam in the opposite direction to the pivoting in the final position for the fog lamps. The light source 12 is moved, when it is pivoted into the final position for the high beams, in the direction of the top of the reflector 10 and downwards. In FIG. 1, the lamp holder 20 with the light source 12 is represented by dashed lines in the final position for the main beams,

  in which the lamp holder 20 is in its posi-

  maximum pivoting clockwise. The light source 12 is moved in the direction of the top of the reflector and downwards in its final position for the high beams, relative to its end position for the low beams. The lamp holder 20 can be

  find in the final position for the main beam headlights

  calf resting on a stop 38. The electric arc of the light source in the final position for the main beam is

  designated in FIG. 1 by the reference 24 ". Furthermore the device

  positive forming a screen 26 can be entirely or partially removed from the path of the rays of light emitted by the source

  light 12 in its final position for the main beam.

  The movement of the screen device 26 can be caused

  qué by the same adjustment device 28 as the pivoting of

  the light source 12, or by a separate adjustment device

  ready. By the modified arrangement of the light source 12 with respect to the reflector 10, the light emitted by the light source 12 is reflected by the reflector 10 with another

  characteristic as that of the arrangement of the light source

  12 in its final position for the dipped beam

  is lying. In FIG. 4, the measurement screen 80 is represented during lighting by the beam of light emitted by the headlight with the light source 12 in its final position for the high beams. The beam of light for the main beams illuminates an area 93, in which are again Il

  drawn several isolux 94 lines to materialize the

  partitioning of lighting intensities. In zone 93 there are

  in an area 95 all around the point HV the intensity of the

  highest rage, for example around 100 to 140 Lux. Zone 93 has in the vertical direction an extension

  due about 50 below the horizontal median plane HH up to

  than 5 above this horizontal median plane HH. In the horizontal direction, the extent of the zone 93 is roughly the same as that of the zone 82 and it reaches on both sides of the vertical median plane VV up to approximately 30 to 400. The zone 93 illuminated by the beam of light for the main beam is moved upwards in relation to the zone 82 illuminated by the beam of light for the dipped beam and has no limit of chiaroscuro or has

  minus only a less clear marked chiaroscuro limit

  seriously. In addition, zone 93 has, compared to zone 82, a more marked maximum of the lighting intensity in the

  zone 95 with higher light intensity.

  Provision may be made to pivot the lamp holder 20 with the light source 12 only between the end position for the dipped beams and the final position

  for main beam headlamps, by not providing specific positions

  defined intermediaries. Alternatively you can also rotate

  ter the lamp holder 20 with the light source 12 of

  continuously or in one or more intermediate positions

  diaries defined between the end position for the dipped beam headlights and the final position for the main beam headlights. The farther the light source 12 is from its end position for the dipped beam headlights, the more it is placed near

  its final position for the main beam, plus the area

  bent by this fact by the reflector 10 approaches on the measurement screen 80 the area 93 illuminated by the beam

  of light for high beam. The measurement screen area

  on 80, illuminated by the beam of light reflected by the reflector 10 is disposed during this pivoting of the lamp holder 20 in an increasingly higher manner and it has

  an increasing intensity of lighting intensity.

  The pivoting of the lamp holder 20 with the light source 12 in one of the intermediate positions or in the end position for the main beams by the adjustment device 28 can take place when there may not be a passage in oncoming traffic low beam, par. example when driving on a highway, or on a fast lane with separate lanes in each direction. The electric motor 30 of the adjustment device can preferably be constituted in the form of a stepping motor. The positions of the lamp holder 20 with the source of

  light 12 for the dipped beam headlights,

  fog and high beam as well as positions

  planned intermediates if any can be exactly adjusted by operating the stepper motor 30 with a

specified number of steps.

  Provision may be made for the control of the adjustment device 28 to take place by means of a control device 48

  to which information about at least one parameter is brought

  vehicle operation. As a function parameter

  Here you can enter in particular the current running speed of the vehicle. When the vehicle is moving

  at a low speed, we do not rotate fully-

  the lamp holder 20 with the light source 12 in its operating position for the high beams by means of the adjustment device 28 until in the final position for the high beams, but in an intermediate position, because in this case it is not necessary to have the greatest range and the highest maximum of the lighting intensity. At higher speeds, the lamp holder 28 is pivoted in an increasing manner towards the final position for the high beams,

  so that the light beam emitted by the lighthouse pre-

  feels a greater range and a higher maximum of

lighting intensity.

  As a variant or in addition to the pre-

  cedent, with the pivoting as a function of the running speed

  lamp holder vehicle che 20 with source of

  light 12, we can also bring information to the

  tif command 38 on at least one condition relating to

  the environment of the vehicle. As a condition relating to the

  environment of the vehicle, for example, you can enter the

  Lement of the road ahead of the vehicle, about which information is brought to the control device 38, that is to say whether the road runs in a straight line or with turns. When the vehicle presents in

  path a section with bends, the device of com

  Mande 38 does not then rotate by means of the adjusting device 28 the lamp holder 20 with the light source 12 in the final position for the high beams, but in an intermediate position, since it is not necessary when the vehicle rolls when cornering to have a beam of light with the greatest range and the highest maximum of light intensity, but it suffices to have a beam of light with a weaker range and with a lower maximum the intensity of the lighting. When the vehicle is traveling in a straight line, the lamp holder 20 with the light source 12 pivots in the final position for the high beams, so that a beam of light is

  emitted by the lighthouse with the greatest range and with the maximum

  the higher the intensity of the lighting. We can all-

  times also provide that the lamp holder 20 with the light source 12 pivots, when the vehicle is traveling in a straight line, in an intermediate position and when the vehicle is traveling in a corner pivots in the final position for the

  main beam, when advantageous.

  Information on the progress of the shoe

  sée in front of the vehicle can be brought to the control device 38 for example by a navigation system. It is also possible to bring with the navigation system other information to the control device 38, for example on the category of the road, that is to say whether it is a departmental road, a regional road, an expressway or a motorway and / or to find out more

  vehicle is inside or outside a location

  lity, and / or for information on the density of traffic. The pivoting of the lamp holder 20 with the light source 12 is then in the operating position for the main beams controlled by the control device 38 in the intermediate position (s) or in the position

  final for high beam based on this information

tions.

  In addition, you can also enter the conditions

  materials as a condition relating to the vehicle environment

  and the pivoting of the lamp holder 20 with the light source 12 in the operating position for the

  high beam may take place depending on the climatic conditions

  materials in the vehicle environment, being able to take into account here for example the visibility distance,

  that is to say whether there is a large distance of visibility

  summer or if there is fog, rain or fall

  a short distance of snow. If there is a

  ble visibility distance we rotate the support

  lamp 20 with the light source 12 in a position

  intermediate, and when there is a large visibility distance

  the lamp holder 20 is pivoted with the light source 12 near or in the final position for the

Redlights.

  The pivoting of the lamp holder with the light source 12 can also be automatically controlled by the control device 48 between the end position for the low beams and the final position for the

  fog lights and in intermediate positions in

  be these two positions. For example the pivoting can take place according to the climatic conditions, in particular

  depending on the visibility distance. In this case the sup-

  lamp port 20 with light source 12 swivels pre-

  when the visibility distance decreases more and more

  more towards its final position for the anti

  fog into this final position for fog lights. The pivoting of the lamp holder 20 with the light source 12 between the end position for the

  Low beam can also take place depending on the humidity.

  humidity in the environment of the vehicle, humidity that is

  tected for example by means of what is called a detector

  rain, by which the ac-

  operation of the wiper installation.

Claims (6)

R E V E N D I C A T IONS   1) Headlight for vehicles used to emit different beams   light beams comprising a reflector (10) and a light source (12), which can be moved by an adjustment device (28) relative to the reflector (10) between a terminal position for the dipped beam, in which the light emitted by the light source (12) is reflected by the reflector (10) in the form of a beam of light   for dipped-beam headlights, with a line   mite chiaroscuro (83, 84) asymmetrical and with a maxi-   determined intensity of lighting intensity, and at least one other   position, in which the light emitted by the light source   light (12) is reflected by the reflector (10) in the form of a beam of light with a different range and a different maximum of light intensity than in the case of the beam of light for the dipped beams, characterized in that in at least this other position, the light source (12)   is arranged by the adjusting device (28) in such a way   Finally, the light emitted by the latter is reflected by the reflector (10) in the form of a beam of light with a weaker range and maximum intensity.   lower illumination than in the case of the light beam best for low beam.   ) Lighthouse according to claim 1, characterized in that   the light source (12) is moved from its terminated position   nal for the dipped beam in its other position, in   away from the top of the reflector (10) and upwards.   3) Lighthouse according to claim 1 or 2, characterized in that   the beam of light emitted by the lighthouse in the other posi-   tion of the light source (12) has a limit of   chiaroscuro horizontal from end to end.   4) headlight according to one of claims 1 to 3, characterized in that   the beam of light emitted by the lighthouse in the other posi-   tion of the light source (12) has a greater horizontal dispersion than the beam of low beam emitted by the headlight with the source in the low beam position.    ) Headlight according to one of claims 1 to 4,   characterized in that in the other position of the light source (12) the reflector (10) is moreover pivoted with the light source (12) in such a way that the beam of light reflected by it has a greater downward inclination   that the beam of light for the dipped beam,   bent by the reflector (10) in the end position of   the light source (12) for the low beams.   6) Lighthouse according to one of the preceding claims,   characterized in that the light source (12) can be moved into at least one intermediate position between its end position for   the dipped beam and its other position.   7) Lighthouse according to one of the preceding claims,   characterized in that the light source (12) can also be moved by means of   of the adjustment device (28) starting from its final position   minimum for dipped beam headlamps, opposite to that in which the movement of the light source (12) has   place in its other position, in at least one ter-   minimum for high beam, in which the light emitted by this source is reflected by the reflector (10) in the form of a beam of light for high beam with a greater range and a higher maximum intensity lighting than in the case of the light beam for the headlights.   8) Lighthouse according to claim 7, characterized in that   the light source (12) can be moved into at least one intermediate position between its end position for the low beams and its final position for the high beams.