• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a communication device, particularly for motor vehicles, comprising a transmission system (1,) provided with a light source (2) capable of emitting an initial light beam (3), the transmission system (1) being configured to generate a first polarized light beam (4) in a first direction (7) from the initial light beam (3), the transmission system (1) further comprising a modulator (11) the polarization direction of the first polarized light beam (4) to transmit information, the device further comprising a reception system configured to detect said first polarized light beam (4) when polarized according to said first direction (7) and to transmit said information.
    公开号:FR3065296A1
    申请号:FR1751277
    申请日:2017-02-17
    公开日:2018-10-19
    发明作者:Kostadin Beev；Marine Courcier；Vanesa SANCHEZ；Pierre Albou；David Hue
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    © Publication number: 3,065,296 (to be used only for reproduction orders) (© National registration number: 17 51277 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY
    COURBEVOIE © Int Cl 8 : G 02 F1 / 1335 (2017.01), B 60 Q 1/26
    A1 PATENT APPLICATION
    ©) Date of filing: 17.02.17. (© Applicant (s): VALEO VISION Joint-stock company (© Priority: simplified - FR. @ Inventor (s): BEEV KOSTADIN, COURCIER MARINE, SANCHEZ VANESA, ALBOU PIERRE and (43) Date of public availability of the HUE DAVID. request: 19.10.18 Bulletin 18/42. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents Holder (s): VALEO VISION Joint stock company related: folded. ©) Extension request (s): (© Agent (s): VALEO VISION Limited company.
    (04) COMMUNICATION DEVICE, ESPECIALLY FOR MOTOR VEHICLES.
    FR 3 065 296 - A1
    The invention relates to a communication device, in particular for motor vehicles, comprising an emission system (1,) provided with a light source (2) capable of emitting an initial light beam (3), the emission system (1) being configured to generate a first beam of polarized light (4) in a first direction (7) from the initial light beam (3), the emission system (1) further comprising a modulator (11) the direction of polarization of the first beam of polarized light (4) so as to transmit information, the device further comprising a reception system configured to detect said first beam of polarized light (4) when it is polarized according to said first management (7) and to transmit said information.

    Communication device, especially for motor vehicles.
    The present invention relates to a communication device, in particular for motor vehicles.
    In the automotive world, there have often been attempts to provide vehicle-to-vehicle communication devices that provide information to others about a driver’s intentions or how to drive. Thus, there are commonly signaling devices which allow other vehicles to anticipate the behavior of a vehicle, such as the flashing light for example, which shows that the driver of the vehicle wants to turn, or the specific brake lights which light up. to warn of an emergency.
    These means are however very limited, because they are only based on visual information of color or ignition rate. Thus, to improve the safety and the behavior of vehicles on the roads, we want today to increase the capacity of transfer of information between vehicles, and to have real communications systems for vehicles.
    Document US2006 / 0119489, for example, is known, in which communication devices for vehicles use the usual vehicle lights or traffic equipment signaling lights. To transfer information, the light emitted by fire is modulated in a pulsed mode. In other words, the light is switched alternately from an extinguished state to an on state, so that information can be coded. The modulation period is chosen to be shorter than the retinal persistence, so that the modulation is not perceived by the human eye. A vehicle is fitted with a detector which decodes the pulsed modulation of the light signal to decode and transfer information, for example to the driver via a digital screen.
    However, the use of such lights lacks efficiency, especially when the light sources of the lights are light-emitting sources, in particular light-emitting diodes. In fact, the light-emitting diodes lose efficiency, the reason being that the light flux of an LED supplied by an average current in pulsed mode, the peak current being relatively high, is less than the light flux of the same LED supplied by the same average current in continuous mode.
    An electroluminescent light source is a source comprising at least one material emitting light in response to an electric current passing through it, or to a strong electric field. Such sources are for example light-emitting diodes, OLEDs (from English for "organic lighth emitting diodes), PLEDs (from English for" polymer lighth emitting diodes).
    Other contemplated transceiver systems are based on the use of radio waves to transmit information. However, it is necessary to install specific transmitters and receivers in vehicles, which is expensive. In addition, it is difficult to distinguish from which vehicle the radiofrequency waves originate.
    The object of the invention is to remedy these drawbacks, and aims to provide a communication device which is simple to arrange in a vehicle, and effective in the transmission of information between vehicles. More specifically, we want to avoid having to use a modulation of the light intensity, which induces variations in light flux as a function of the data exchanged.
    For this, the invention relates to a communication device, in particular for motor vehicles, comprising an emission system provided with a light source capable of emitting an initial light beam, the emission system being configured to generate a first beam of light polarized in a first direction from the initial light beam, the emission system further comprising a modulator of the direction of polarization of the first beam of polarized light so as to transmit information, the device further comprising a reception system configured to detect said first beam of light polarized in said first direction and to transmit said information.
    Thus, the modulated polarized light beam makes it possible to easily transmit information, for example for motor vehicles or for a vehicle and road infrastructure equipment. In fact, the reception system detects only the first beam of polarized light, when the latter is polarized in the first direction. By modulating the direction of polarization of the first beam, information can be transmitted. The intensity of the illumination of the first beam supplied by the emission system is substantially the same since only the polarization is changed.
    The device can in particular operate with common vehicle lights, as a light source for the emission system, to avoid having to resort to additional light sources. In addition, thanks to the invention, there is obtained from a single light source, a lighting beam having a specific function, for example a code type light, and means for transmitting information using the same beam. of initial light.
    According to different embodiments of the invention, which can be taken together or separately:
    the modulator comprises a screen capable of modulating the polarization of the first beam of polarized light between the first direction of polarization and a second direction of polarization,
    the first and the second direction of polarization are orthogonal,
    the modulator comprises a liquid crystal screen switchable between a first configuration in which the first beam of polarized light is transmitted in the first direction of polarization, and a second configuration in which the first beam of polarized light is transmitted in the second direction of polarization,
    - the emission system includes a linear splitter configured to split the initial light beam to form the first polarized light beam and a second polarized light beam in the second direction of polarization,
    - the emission system is configured to generate a light beam from the initial light beam,
    - the emission system is configured so that the lighting beam is partly formed by the first beam of polarized light whatever its direction of polarization,
    - the emission system is configured to recombine the first beam of polarized light in the first direction and the second beam of polarized light so as to form the lighting beam,
    - the emission system comprises a second splitter configured to reflect the first beam of polarized light in the first direction of polarization, and transmit the first beam of polarized light in the second direction,
    the light source comprises an electroluminescent light source,
    the electroluminescent light source comprises at least one semiconductor emitting element,
    the light source is a non-polarized light source, such as a light-emitting diode,
    the light source is a polarized light source, such as a laser source,
    - the emission system comprises a wavelength conversion element, of photo-luminescent type, arranged to transform the initial polarized light beam into a non-polarized light beam,
    - The reception system includes a light detector and a polarizing filter configured to let the light polarized in the first direction pass.
    The invention also relates to a transmission system for such a communication device according to the invention.
    The invention also relates to a light device, in particular for a motor vehicle, comprising such a communication device.
    The invention will be better understood in the light of the following description which is given for information only and which is not intended to limit it, accompanied by the accompanying drawings among which:
    FIG. 1 schematically illustrates a first embodiment of a transmission system of a communication device according to the invention,
    FIG. 2 schematically illustrates a second embodiment of a transmission system of a communication device according to the invention,
    FIG. 3 schematically illustrates a system for receiving a communication device according to the invention,
    - Figure 4 schematically illustrates the transmission of information during the operation of the device.
    The invention relates to a communication device comprising a transmission system and a reception system. The device is for example arranged on motor vehicles, not shown in the figures, in order to transfer information from one vehicle to another. In particular, a transmission system of one vehicle is configured to transmit information to a reception system of the other vehicle, and vice versa.
    As illustrated in FIG. 1, the emission system 1 is provided with a light source 2 capable of emitting an initial light beam 3. In this embodiment, the light source 2 is a non-polarized light source, such as a light emitting diode. The light source 2 is for example a source of a common vehicle light, such as a low beam.
    The emission system 1 is configured to generate a first beam of polarized light 4 in a first direction 7 from the initial light beam 3. The beam polarized in the first direction 7 is represented by a solid circle. To this end, the emission system 1 comprises a separator 6, preferably linear, configured to divide the initial light beam 3 and form the first beam of polarized light 4. The separator 6, which is for example a polarizer, is preferably arranged in the optical axis of the light source 2. Here, the splitter 6 reflects the part of the initial light beam 3 oriented in the first direction, this part forming the first polarized light beam 4, which is directed here substantially perpendicular to the optical axis. The emission system 1 advantageously comprises a collimation optic, not shown in the figures, disposed between the light source 2 and the separator 6. Such a separator 6 comprises for example a grid polarizer, or a polarizer of the Glan- type. Thomson or Wollaston, or even a Nicol-type prism.
    In other embodiments, it is also possible to use other types of polarizer making it possible to obtain an orientation of the polarized beams other than perpendicular and / or parallel to the optical axis.
    The reception system 10, shown in FIG. 3, is configured to detect said first beam of polarized light 4, 24 in said first direction 7 and to transmit said information. The reception system 10 is provided with a light detector 8 and a polarizing filter 9 configured to let the polarized light directed in the first direction pass. The polarizing filter 9 is placed in front of the detector 8 so that the latter does not detects that the beam of polarized light 4 in said first direction 7.
    According to the invention, the emission system 1 also comprises a modulator 11 of the direction of polarization of the first beam of polarized light 4, as shown in FIG. 1. The modulation consists in emitting the first beam of polarized light 4 in the first direction 7 intermittently so that the detector detects the first beam 7 fractionally over time, which allows coding of the information to be transmitted by the transmission system 1 and decoding by the detection system. Preferably, the modulator 11 is capable of instantly modifying the angle of polarization of the first polarized beam 4 so as to be able to code and transmit information. Thus, when the first beam 4 is polarized in the first direction 7, the detection system detects the first beam 4 and when the first beam is directed in a second direction 12, the detection system does not detect the first polarized beam 4. The first 7 and second 12 directions are advantageously orthogonal to differentiate them well, which depends on the type of separator chosen. The second direction 12 is shown in the figure by a double arrow.
    The modulator 11 here comprises a screen capable of modulating the polarization of the first beam of polarized light 4 between said first direction 4 of polarization and the second direction 12 of polarization. The screen is for example a liquid crystal screen switchable between a first configuration in which the first beam of polarized light 4 is transmitted in the first direction of polarization 7, and a second configuration in which the first beam of polarized light 4 is transmitted in the second direction of polarization 12. In the liquid crystal layer of the screen, the direction of polarized light can be changed by the liquid crystals. Indeed, when the liquid crystals are arranged in chiral layers, they transmit the first polarized beam 4 by modifying its polarization in the second direction 12. On the other hand, when the liquid crystals are oriented isotropically in the same direction, that of the field applied to them, they transmit the beam with the same direction of polarization, here the first direction 7. Thus, the orientation of the liquid crystals determines the direction of polarization of the light.
    The modulator is, for example, provided with a control device, not shown in the figures, arranged to control the switching of the screen from one configuration to another, and thus induce the modulation of the first light beam 4. The control device is further configured to generate the coding of said information thanks to the modulation by the screen. In addition, a mirror 5 is arranged here to reflect the first polarized light beam 4 towards the modulator 11 at the output of the separator 6.
    The emission system 1 is advantageously configured so that the lighting beam is partly formed by the first beam of polarized light 4, and this regardless of its direction of polarization. The first polarized beam 4 is emitted with a substantially constant intensity, even when its polarization is modulated. Thus, the intensity emitted from the lighting beam is substantially equivalent to the sum of the intensities of the first polarized beam and the second polarized beam. In this case, the mirror 5 also has the function of realigning the first 4 and second 14 beams so that they together constitute at least in part the light beam generated by the emission system 1.
    In an alternative embodiment, the emission system 1 is configured to generate a light beam from the initial light beam 3. For this, the separator 6 is able to generate a second light beam 14 different from the first . Here, the second light beam 14 is polarized in the second direction 12 of polarization. Here, the second light beam 14 is transmitted by the splitter 6 along the same optical axis as the initial beam 3. The second polarized beam 14 preferably forms the lighting beam generated by the emission system 1, at least in part.
    The reception system 10 detects the first light beam 4 polarized in the first direction 7, and does not detect the first light beam 4, when the latter is polarized in the second direction 12, nor the second beam 14 also polarized in the second direction 12. A lighting beam of constant intensity is thus obtained, in which the first light beam has a direction of polarization which can be switched between the two directions 7, 12 in order to transmit information. Thanks to the invention, the light beam makes it possible to emit information without losing luminous flux.
    In another embodiment, the reception system detects the second polarized beam 14 in the second direction 12 and the first light beam 4 polarized in the second direction 12, and does not detect the first light beam 4, when the latter is polarized in the first direction 7. A lighting beam of constant intensity is thus obtained, in which the first light beam has a direction of polarization switchable between the two directions 7, 12 in order to transmit information. Thanks to the invention, the light beam makes it possible to emit information without losing luminous flux.
    In FIG. 2, the second embodiment shows an emission system 21 comprising a source 22 generating an initial beam 23, a first separator 26, a mirror 25 and modulator 31, which are arranged in the same way as in the first embodiment, to obtain a first beam of polarized light 24 in a first 27 or a second direction 32 and a second beam of polarized light 34 in the second direction 32. The second mode makes it possible to recombine the first beam of polarized light 24 in the first direction 27 and the second polarized light beam 34 in the second direction 32. In other words, the two beams 24, 32 are substantially oriented along the same optical axis.
    To achieve this, the emission system 21 comprises, in addition to a first separator 26, a second separator 36 arranged at the intersection of the first beam of polarized light 24 at the modulator output 31, and the second beam of polarized light 34. The second separator 36 has the function of deflecting the first polarized beam 24, when it is in the first polarization direction, in the same direction as the second polarized light beam. On the other hand, the separator 36 lets through the light which is polarized in the second direction. Thus, when the first beam 24 is polarized in the second direction 32, it crosses the separator without being deflected. Likewise, the second light beam 34 which arrives transversely, passes through the separator 36. The first light beam 24 is deflected along the same optical axis as that of the second polarized light beam 34, only when it is polarized in the first direction 27 of polarization.
    The emission system 21 is here provided with a first 35 and a second additional mirror 37. The first mirror 35 is arranged to reflect the first polarized light beam 24 towards the second separator 36, after the modulator 31. The second mirror 37 reflects the first polarized light beam in the second direction 32, after the transmission through the second separator , so as to direct it in a preferential direction.
    In this embodiment, the lighting beam of the device is formed by the recombination of the first beam of polarized light 24 in the first direction 27 and the second beam 34 of polarized light in the second direction 32. The first beam of polarized light 24 in the second direction 32 is offset. It can also be used to form the light beam so that the light beam keeps a constant intensity during modulation.
    FIG. 4 illustrates the detection of the light received by the receiver as a function of the polarization of the first light beam. A light detection signal is thus obtained, which is here a function in the form of slots 16, and makes it possible to code information. When the polarization of the first light beam is oriented in the first direction 7, the first beam passes through the polarizing filter of the receiver to reach the detector, and the signal has the high value of the slot function. When the polarization of the first light beam is oriented in the second direction 12, the signal has the low value of the square-wave function, because the first light beam does not pass through the filter and the detector does not receive light.
    Thus, by activating the modulator, it is possible to encode information to be transmitted from the transmission system to the reception system by modulation.
    In a first alternative embodiment, not shown in the figures, the light source is a polarized light source, such as a laser source. The laser source allows the first polarized beam to be obtained directly. The initial beam is nevertheless separated in two by a separator in order to obtain a first and a second polarized beam.
    Alternatively, the emission system further comprises a wavelength conversion element arranged to transform the initial beam of polarized light into a beam of non-polarized light. Such a light converter comprises a luminescent material designed to absorb at least part of an excitation light emitted by a light source, and to convert at least a part of said absorbed excitation light into emission light having a wavelength different from that of the excitation light. As the luminescent material diffuses the emitted and transmitted light, the light of the light beam thus generated is non-polarized. Modulation and separation are performed after the wavelength conversion of the initial beam by the converter. In this case, only part of the converted initial beam is used for communication. In addition, a filter tuned to the wavelength of the laser can be used to increase the signal-to-noise ratio.
    In a second variant embodiment, not shown in the figures, the light source is an infrared source which generates an initial infrared light beam. The operation is the same as in the previous embodiments.
    In another embodiment, not shown in the figures, the modulation of the polarization of the first light beam is associated with a pulsed modulation of the ignition of the light source. Thus, two communication channels can be used and the capacity and speed of information transfer between the transmission system and the reception system can be increased. The pulse modulation frequency is preferably carried out at high frequency.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. Communication device, in particular for motor vehicles, comprising an emission system (1, 21) provided with a light source (2, 22) capable of emitting an initial light beam (3, 23), the system of the emission (1, 21) being configured to generate a first polarized light beam (4, 24) in a first direction (7, 27) from the initial light beam (3, 23), the emission system ( 1, 21) further comprising a modulator (11, 31) of the direction of polarization of the first beam of polarized light (4, 24) so as to transmit information, the device further comprising a reception system (10) configured for detecting said first beam of polarized light (4, 24) when it is polarized in said first direction (7, 27) and for transmitting said information.
    [2" id="c-fr-0002]
    2. Communication device according to claim 1, in which the modulator (11, 31) comprises a screen capable of modulating the polarization of the first beam of polarized light between the first direction of polarization (7, 27) and a second direction of polarization (12, 32).
    [3" id="c-fr-0003]
    3. Communication device according to claim 2, in which the first (7, 27) and the second (12, 32) direction of polarization are orthogonal.
    [4" id="c-fr-0004]
    4. Communication device according to any one of claims 2 or 3, in which the modulator (11, 31) comprises a liquid crystal screen switchable between a first configuration in which the first beam of polarized light (4, 24) is transmitted in the first direction of polarization (7, 27), and a second configuration in which the first beam of polarized light (4, 24) is transmitted in the second direction of polarization (12, 32).
    [5" id="c-fr-0005]
    5. Communication device according to claim 3 or 4, in which the emission system comprises a linear separator (6, 26) configured to divide the initial light beam (3, 23) to form the first beam of polarized light ( 4, 24) and a second beam of polarized light (14, 34) in the second direction of polarization (12, 32).
    [6" id="c-fr-0006]
    6. Communication device according to any one of the preceding claims, in which the emission system (1, 21) is configured to generate a light beam from the initial light beam (3, 23).
    [7" id="c-fr-0007]
    7. Communication device according to claim 6, in which the emission system (1, 21) is configured so that the lighting beam (3, 23) is partly formed by the first beam of polarized light (4, 24) whatever its polarization direction.
    [8" id="c-fr-0008]
    8. Communication device according to claim 7, in which the emission system (1, 21) is configured to recombine the first beam of polarized light (4, 24) in the first direction (7, 27) and the second beam polarized light (14, 34) so as to form the illumination beam.
    [9" id="c-fr-0009]
    9. Communication device according to claim 8, in which the emission system (21) comprises a second splitter (36) configured to reflect the first beam of polarized light (24) in the first direction of polarization (27), and transmitting the first beam of polarized light (24) in the second direction (32).
    [10" id="c-fr-0010]
    10. Communication device according to any one of the preceding claims, in which the light source (2, 22) is a non-polarized light source, such as a light-emitting diode.
    [11" id="c-fr-0011]
    11. Communication device according to any one of claims 1 to 9, in which the light source (2, 22) is a polarized light source, such as a laser source.
    [12" id="c-fr-0012]
    12. Communication device according to claim 11, in which the transmission system comprises a wavelength conversion element arranged to transform the initial polarized light beam into a non-polarized light beam.
    [13" id="c-fr-0013]
    13. Communication device according to any one of the preceding claims, in which the reception system (10) comprises a light detector and a polarizing filter (9) configured to let the light polarized in the first direction pass (4, 24).
    [14" id="c-fr-0014]
    14. Transmission system (1, 21) for communication device according to any one of the preceding claims.
    [15" id="c-fr-0015]
    15. Light device, in particular for a motor vehicle, comprising a communication device according to one of claims 1 to 13.
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    同族专利:
    公开号 | 公开日
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    US11030897B2|2021-06-08|
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    法律状态:
    2018-02-26| PLFP| Fee payment|Year of fee payment: 2 |
    2018-10-19| PLSC| Search report ready|Effective date: 20181019 |
    2020-02-28| PLFP| Fee payment|Year of fee payment: 4 |
    2021-02-26| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1751277A|FR3065296B1|2017-02-17|2017-02-17|COMMUNICATION DEVICE, ESPECIALLY FOR MOTOR VEHICLES|
    FR1751277|2017-02-17|FR1751277A| FR3065296B1|2017-02-17|2017-02-17|COMMUNICATION DEVICE, ESPECIALLY FOR MOTOR VEHICLES|
    EP18156171.3A| EP3364564B1|2017-02-17|2018-02-09|Optical communication system for vehicles|
    CN201810147868.2A| CN108454504B|2017-02-17|2018-02-12|Communication device, in particular for a motor vehicle|
    JP2018026384A| JP2018157545A|2017-02-17|2018-02-16|Communication device, notably for motor vehicles|
    US15/899,392| US11030897B2|2017-02-17|2018-02-20|Communication device, notably for motor vehicles|
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