EP3030831A1 - Mechanism for cutting off a light beam for an optical module and said optical module - Google Patents
Mechanism for cutting off a light beam for an optical module and said optical moduleInfo
- Publication number
- EP3030831A1 EP3030831A1 EP14756093.2A EP14756093A EP3030831A1 EP 3030831 A1 EP3030831 A1 EP 3030831A1 EP 14756093 A EP14756093 A EP 14756093A EP 3030831 A1 EP3030831 A1 EP 3030831A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piece
- bar
- cut
- cutoff
- transmission shaft
- 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
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 39
- 230000003287 optical effect Effects 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 45
- 238000013016 damping Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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 relates to a light beam cutting mechanism for optical module and optical module. It applies in particular to an optical module intended to fit into an automotive projector, in particular an elliptical projector, installed at the front of the motor vehicle.
- Such optical modules have a light source that projects light onto a reflector. The light is then reflected on a lens to be reversed and returned as a light beam outside the vehicle.
- the invention is more particularly concerned with optical modules comprising a rotary cut-off bar, electrically actuated to move, on command, a first angular position, in which it obscures part of the light beam in order to limit the scope of the projector to that of the code lights so as not to dazzle other drivers traveling in opposite directions, to a second angular position, in which it does not obscure the light beam, the range of the projector then corresponding to that of high beam.
- the cutoff bar is electrically driven by a motor to drive it in rotation.
- the motor comprises for this purpose a transmission shaft rotating a gear mechanism so as to transmit to the cut bar its rotational movement.
- Activation of the motor drives the cutoff bar from its first position corresponding to the code lights to a stop holding the cutoff bar in its second position corresponding to high beam.
- the motor is then kept activated so that the transmission, through the gear mechanism, hold the cut-off bar in this position.
- the motor When it is desired to reposition the cutoff bar in its first position, the motor is deactivated. Its transmission shaft is then free to rotate so that it no longer retains the cutoff bar. It is then driven via a return spring to a stop defining its first position. During this rotation, it is the cutoff bar which drives the transmission shaft in rotation through the gear mechanism.
- the cutoff bar quickly passes from its second to its first position to limit the transition time between the high beam and the code lights.
- the return force that the spring exerts on the bar is therefore important and when the cutoff bar comes against the stop defining its first position, it is thus subject to rebounds.
- These rebounds are further amplified by the inertia of the transmission shaft, driven with the bar as seen above, and the rotor of the motor to which the transmission shaft is connected. These rebounds may be perceptible by the driver and result in a degradation of the code function until the cutoff bar is stabilized.
- the invention aims to improve the situation. It thus relates to an optical module breaking mechanism comprising a cut-off bar, a motor driving the cut-off bar between at least a first and a second position via an engine transmission shaft and a d driving the cut-off bar connected to the transmission shaft, a return means tending to return the cut-off bar to its first position, characterized in that the drive means comprises a device for decoupling the movement of the transmission shaft relative to that of the cutoff bar when the cutoff bar reaches the first position.
- the decoupling device at the moment when the cut-off bar comes into contact with a first stop defining the first position of the cut-off bar, its rotational movement stops while that of the drive shaft continues.
- the rebounds of the cutoff bar are then greatly reduced since it is not subject, at this time, to the inertia of the drive shaft and that its own inertia is very low.
- the transmission shaft will be slowed especially because of the internal characteristics of the engine, for example by friction, and when the cutoff bar and the transmission shaft will be coupled again, the rotational speed of the drive shaft and therefore its kinetic moment will be reduced.
- said decoupling device comprises one or more damping means of the movement of the transmission shaft once the breaking bar has reached the first position.
- the movement of the propeller shaft is thus damped more than by its simple friction which has the effect of reducing rebounds suffered by the cutoff bar.
- the damping is done, for example, by the friction of one piece on another.
- the decoupling device comprises a first integral part of the transmission shaft and a second part driving the rotating cut bar, the first part being driven by the second part when the bar of cutoff passes from the second position to the first position, said first piece decoupling from the second piece when the cutoff bar reaches the first position.
- the second piece damps the movement of the first piece when the cutoff bar reaches the first position.
- the damping means is advantageously constituted by the friction between the second piece and the first piece.
- the second part comprises a toothing making a gear with said cutoff bar.
- the first and second parts are connected so as to allow an angular displacement of the first part relative to the second part along an axis of rotation of the transmission shaft.
- the angular displacement thus allows the decoupling of the movement of the first piece relative to that of the second piece when the cutoff bar reaches its first position.
- the second part comprises a groove in the form of angular sector and the first part comprises a rib moving in said groove so as to allow said angular deflection.
- the damping means is constituted by the friction between the rib and the groove.
- the first piece has the shape of a cylinder located at a distal end of the transmission shaft, said rib being located at the periphery of the cylinder.
- the first piece is located in the center of the second piece, said groove in the form of angular sector being located at the periphery of said first piece.
- the decoupling device in the form of a conventional gear cylinder comprising the first part in its central part and the second part in its peripheral part. In this way it can be integrated into existing cut-off mechanisms without the need for modification of the cut-off mechanism.
- the invention also relates to an optical module comprising a cutoff mechanism as described above.
- the invention will be better understood in the light of the following description which is given only as an indication and which is not intended to limit it, accompanied by the appended drawings among which:
- FIG. 1 is a schematic view of an optical module with a cut-off mechanism
- FIG. 2 is an exploded perspective view of the breaking mechanism of the invention
- FIG. 3 is a perspective view of the cut-off mechanism illustrated in FIG. 2, once assembled;
- FIG. 4 is a side view of the cut-off mechanism illustrated in FIG. 3;
- FIG. 5 is a perspective view of a motor of the cut-off mechanism provided with a decoupling device according to the invention.
- FIG. 6 is an exploded perspective view of the motor and the decoupling device of FIG. 5.
- FIG. 1 illustrates an optical module 1 comprising a cutoff mechanism 5 according to the invention.
- Such an optical module comprises a light source 2 producing a light beam reflected by an optical reflector 3. The light beam is then projected onto a lens 4 which reverses it and returns it to the road in front of the vehicle in which the optical module is mounted .
- the lens 4 is disposed on a lens holder 7.
- the light source is here a halogen lamp.
- the cut-off mechanism 5 is arranged between the reflector 3 and the lens 4. This cut-off mechanism 5 makes it possible to more or less close the light beam, in response to a command from the user of the vehicle or to an automatic command, in order to to propose different modes of lighting of the road.
- the cut-off mechanism 5 comprises a cut-off bar 10.
- This is a bi-function breaking mechanism, that is to say that the cut-off bar can be positioned in two positions, a first position in which it partially closes the light beam and corresponding to the code light and a second position in which it does not close or less light beam and corresponding to the high beam. In its first position, the cutoff bar 10 extends in a substantially vertical plane while in its second position it extends in a substantially horizontal plane.
- the cutoff bar 10 is positioned in front of the light source. It is mounted on a support 1 1 of bar comprising a first portion 12 having a gear 14, located at a first longitudinal end 72 of the bar 10.
- the first part is here in the form of a sector disk and comprises a central portion 21 at the periphery of which is the gear 14.
- the support 1 1 of the bar also comprises a second portion 13 having a return means, in particular a return spring 15, tending to bring the bar 10 in the first position, that is to say in its substantially vertical position, the second portion 13 being located at a second longitudinal end 73 of the bar 10.
- the first longitudinal end 72 is located to the left of the bar 10 in Figure 2 while the second longitudinal end 73 is located to the right of the bar 10.
- the bar 10 is here made of steel. It is of substantially rectangular shape and arranged to more or less close the light beam as explained above, that is to say to cut more or less the light beam.
- the support 1 1 bar is mounted on a frame 50 of the cut-off mechanism 5.
- the cut-off mechanism 5 also comprises a drive means 90 including in particular the first portion 12 of the support January 1 and a pinion with a toothing,
- the drive means 90 is connected to a drive shaft 38 of the DC motor 30 so as to drive the cut-off bar.
- the motor 30 is of substantially parallelepipedal shape so that it comprises an upper face 32, a front face 33, a lower face 34, a rear face 35, a left face 36 and a straight face 37.
- the upper face 32 and the lower face 34, opposite each other are of curved shapes.
- the drive means 90 At the left face 36 of the motor 30 is the drive means 90. It is connected to the transmission shaft 38, projecting from the left face 36 of the motor 30 and located substantially in the middle of the face left 36 of the engine 30.
- the motor 30 is mounted on a motor support 40 located in the center and towards the front of the armature 50, that is to say between the motor and lens, once the cut-off mechanism 5 is mounted in the optical module. .
- the cut-off mechanism 5 also comprises a heat shield 60 matching an outer face of the support 40 of the motor 30 directed towards the front.
- the heat shield 60 is thus located between the engine support 40 and the lens. It is made of metal so that it protects the motor mount 40 and the motor 30 from the sun's rays.
- the central portion 21 of the first portion 12 of the support January 1 comprises a light (not visible) cooperating with a boss 61 of the cutoff mechanism 5 located on the armature 50. The freedom of movement of the boss 61 in the light defines the rotation the cutoff bar must be between its first position and its second position.
- the light defines a first stop against which the boss 61 abuts when the cutoff bar is in its first position and a second stop against which the boss 61 abuts when the cutoff bar is in its second position.
- the motor 30 drives the cutoff bar through its drive means 90 and the drive shaft 38 from its first position to its second position by switching the cutoff bar forward. As long as it is desired to maintain the cut-off bar 10 in the high beam position, that is to say in its second position, the motor remains activated so that its transmission shaft 38 maintains the cut-off bar 10 in this position. position via the drive means 90.
- the drive means 90 comprises a decoupling device 81 of the movement of the transmission shaft 38 relative to that of the cutoff bar 10 when the cutoff bar 10 reaches the first position.
- the decoupling device 81 is described in greater detail in FIGS. 4 to 6. It will be noted in these figures that it comprises a first substantially cylindrical piece coaxial and connected to the transmission shaft 38, ie that is to say that the first piece is integral with the transmission shaft 38.
- the first piece 82 comprises a ring 91 located at its base, that is to say, its part located closest to the engine.
- the ring 91 has a larger diameter than the cylindrical shape of the first piece 82.
- the first piece 82 may be located at a distal end of the transmission shaft 38. It comprises a rib 87 which extends radially at the periphery of the cylinder.
- the decoupling device also comprises a second substantially cylindrical part 83 and driving the cut-off bar.
- the second part 83 drives the cut-off bar via the first part 12 of the bar support comprising the gear.
- the second piece 83 is here a pinion comprising a set of teeth 89.
- the second piece 83 can thus mesh with the gear of the first part in order to drive the cutoff bar.
- the second part comprises a central opening, coaxial with the drive shaft.
- the second piece 83 comprises a groove 84 penetrating radially, from the central opening to the outside, in the thickness of the pinion.
- the groove 84 is here in the form of angular sector. It extends between a first end 85 situated on the left of FIG. 4 and a second end 86 located on the right of FIG. 4.
- the first piece is located here in the center of the second piece 83.
- groove 84 is located around the first piece 82, especially at the periphery thereof.
- the central opening of the second piece 83 accommodates the first piece 82 and it is the groove 84 which receives the rib 87.
- the first piece 82 is thus inserted into the second piece 83 so that the ring 91 is in contact with the second piece 83.
- the decoupling device 81 has the shape of a conventional pinion and can be positioned on a transmission shaft of the prior art without requiring special adaptation of the transmission shaft 38.
- the groove 84 is located at the periphery of the first piece 82. It allows the first piece 82 to rotate about the axis of the transmission shaft, within the angular sector that it defines without the second piece 83 does not turn. It will be understood that the first piece 82 and the second piece 83 are connected so as to allow an angular displacement of the first piece 82 relative to the second piece 83 along an axis of rotation of the transmission shaft 38. the first piece 82 in the groove 84 is thus uncoupled from the movement of the second piece 83. Indeed, when the motor 30 drives the cut-off bar 10 from the first to the second position, its transmission shaft 38 turns here in the direction clockwise in FIG.
- the transmission shaft 38 however continues its rotation because of its inertia, the groove 84 then allowing the displacement of the rib 87 and thus the first piece 82 connected to the transmission shaft 38. This gives, on the extent of the groove, a decoupling of the movement of the transmission shaft 38 relative to that of the cutoff bar when the latter reaches its first position.
- the rib 87 traverses the path defined by the groove 84 to abut against the first end 85 of the groove 84.
- the transmission shaft being subjected to friction internal to the engine, it loses speed during its rotation. corresponding to the angular sector defined by the groove. Its momentum will thus be reduced so that the bounces to which the cut-off bar is subjected will be reduced.
- the decoupling device 81 may also comprise one or more damping means so that the movement of the transmission shaft is further braked and its speed is further reduced when the rib 87 reaches the first end 85 of the groove 84.
- damping means here comprise the first piece 82 and the second piece 83 and consist in particular of friction between the first piece 82 and the second piece 83, in particular between the rib 87 and the bottom of the groove 84. Frictions between the first piece 82 and the second piece 83 other than those made between the rib 87 and the groove 84 can also dampen the movement of the transmission shaft 38.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Lens Barrels (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1357839A FR3009602B1 (en) | 2013-08-06 | 2013-08-06 | LIGHT BEAM BREAKING MECHANISM FOR OPTICAL MODULE AND OPTICAL MODULE |
PCT/FR2014/052038 WO2015019021A1 (en) | 2013-08-06 | 2014-08-05 | Mechanism for cutting off a light beam for an optical module and said optical module |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3030831A1 true EP3030831A1 (en) | 2016-06-15 |
EP3030831B1 EP3030831B1 (en) | 2021-02-24 |
Family
ID=49510337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14756093.2A Active EP3030831B1 (en) | 2013-08-06 | 2014-08-05 | Vehicle headlamp with projection lens and movable shade |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3030831B1 (en) |
CN (1) | CN105452761B (en) |
FR (1) | FR3009602B1 (en) |
WO (1) | WO2015019021A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2895783B1 (en) * | 2006-01-05 | 2008-02-01 | Valeo Vision Sa | THREE-FUNCTION LIGHT PROJECTOR FOR MOTOR VEHICLE |
JP4714108B2 (en) * | 2006-08-09 | 2011-06-29 | 株式会社小糸製作所 | Infrared light irradiation lamp for vehicles |
FR2936591B1 (en) * | 2008-09-30 | 2014-09-12 | Valeo Vision Sas | OPTICAL MODULE FOR A MOTOR VEHICLE FOR SELECTIVELY LIGHTING A ZONE |
DE202009009519U1 (en) * | 2009-07-07 | 2009-09-17 | Automotive Lighting Reutlingen Gmbh | Motor vehicle headlight with an additional panel |
DE202011005617U1 (en) * | 2011-04-27 | 2011-06-27 | Automotive Lighting Reutlingen GmbH, 72762 | Light module of a motor vehicle headlight |
-
2013
- 2013-08-06 FR FR1357839A patent/FR3009602B1/en not_active Expired - Fee Related
-
2014
- 2014-08-05 WO PCT/FR2014/052038 patent/WO2015019021A1/en active Application Filing
- 2014-08-05 EP EP14756093.2A patent/EP3030831B1/en active Active
- 2014-08-05 CN CN201480044114.4A patent/CN105452761B/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2015019021A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN105452761A (en) | 2016-03-30 |
EP3030831B1 (en) | 2021-02-24 |
WO2015019021A1 (en) | 2015-02-12 |
CN105452761B (en) | 2018-08-31 |
FR3009602A1 (en) | 2015-02-13 |
FR3009602B1 (en) | 2015-08-28 |
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