• 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 protection device (5) for an optical sensor (3) comprising: - an optical sensor (3) - a protective case (21), the optical sensor (3) being installed inside ( 23) of the housing (21), - a mechanical protection screen (31; 331; 332; 350) arranged opposite the optical sensor (3) and able to assume a protective position in which the mechanical screen (31; 331; 332; 350) closes the protective housing (21) and a retracted position in which the mechanical screen (31; 331; 332; 350) releases the field of view of the optical sensor (3). The device further comprises an air discharge pump (13) connected via a discharge line (15) to the protective housing (21) for injecting air into the protective housing. (21) so that the injected air moves the mechanical shield (31; 331; 332; 350) from its protective position to the retracted position.
    公开号:FR3027006A1
    申请号:FR1459713
    申请日:2014-10-10
    公开日:2016-04-15
    发明作者:Frederic Giraud；Jean Claude Wadowski；Pascal Harand；Frederic Ladrech；Laszlo Albouze；Cedric D'elloy
    申请人:Valeo Systemes dEssuyage SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a device for protecting an optical sensor. Nowadays, rear vision cameras are used in a large number of motor vehicles, and in particular they are part of a parking assistance system that makes it easier to park in a location without turning around and to detect obstacles. located behind the vehicle. Cameras are known which are installed inside the cockpit against the rear window / bezel looking towards the rear from the rear window of the vehicle. These cameras are well protected from external climatic influences and can for example benefit from the defrosting and cleaning systems of the rear window, for example a heating wire integrated in the glass of the rear window. However, the angle of view is not optimal, especially for parking assistance and for this reason, it is preferred that the camera is arranged at the rear bumper or the rear registration plate of the 20 vehicle. In this case, the camera is highly exposed to the projections of dirt that can be deposited on its optics and thus reduce its effectiveness, or even make it inoperative. Especially in rainy weather, there are projections of rain and dirt which can greatly affect the operability of the vision system. To counteract the deposition of dirt on the camera, it is known to arrange a device for cleaning the optics of the camera, usually a nozzle of cleaning fluid, close to it, to remove the polluting elements that are deposited over time. However, the optics of the camera, which is a relatively fragile element, is not protected from projections that may damage it. 3027006 WFR2163 2 It is also known to mount the camera inside the outer skin of the vehicle, and to protect it from external aggressions through a protective glass attached to the cladding. Although the camera is protected from external aggression, the camera 5 remains subject to the deposition of pollutants located inside the vehicle skin, and the cleaning of the camera is particularly difficult in such an arrangement. Document W02005039934 in the name of the applicant discloses a mounting of a rear view camera in a protective housing 10 comprising a viewing window. This assembly further comprises a device for spraying a cleaning liquid on the viewing pane. Thus, the camera is well protected while allowing to ensure an optimal vision after a cleaning. However, this arrangement is too cumbersome and cameras 15 currently available on the market are waterproof so that it is preferred to mount directly on a body part at the bumper or the license plate. A new concept appeared since does not tend to clean the camera as soon as it is dirty to maintain its operability, but to keep it clean permanently against the projections of rain or dust. For this purpose, it is known to continuously project an air curtain in front of the screen camera which prevents the deposition of dirt (see for example JP 2012-201122 or W003104052). However, the projection of the protective screen air curtain is in operation only when the vehicle is running. When it is stopped, for example parking in a parking lot, the camera is not protected at all and dirt, mud, dust, rain, frost etc. can be deposited on the camera, especially on its optics. To remedy this problem, it is known from WO2005 / 021329 30 in the name of the Applicant a rear vision system comprising a flap mounted movably in displacement between a closed position and an open position in which said flap is respectively disposed in front of and 3027006 WFR2163 3 away from the lens of the camera, as well as motor means adapted to drive the shutter in displacement between the closed position and the open position. Thus, when the vehicle is stopped, the flap is in its closed position and protects the camera from soiling. Although effective, this solution is nevertheless expensive because it requires at least one motor to move the shutter between the open and closed positions and an appropriate control electronics. In addition the drive mechanism is complex and can seize making the rear vision system inoperable in the closed position of the shutter or exposing the camera 10 to all soils in case the flap is locked in the open position. The present invention proposes to remedy at least partially the disadvantages mentioned above by having an optical sensor protection device that is effective, inexpensive, and whose maintenance can be reduced. For this purpose, the subject of the invention is a device for protecting an optical sensor comprising: an optical sensor a protective case, the optical sensor being installed inside the case, a mechanical screen of protection, arranged in front of the optical sensor and can take a protective position in which the mechanical screen closes the protective housing and a retracted position in which the mechanical screen releases the field of view of the optical sensor, characterized in that it comprises an air discharge pump connected via a discharge line to the protective casing for injecting air into the protective casing so that the injected air moves the screen mechanical protection from its protective position to the retracted position.
    [0002] Thus, the injected air has a dual function, a first relating to the cleaning of the optics of the optical sensor and a second to move the protective shield 3027006 from its closed position to its open position. Another advantage is that the air supply can be reduced only at times when the rear vision system has to operate, which also reduces energy consumption and allows the installation of an air discharge pump. cheaper, since the number of hours of operation can be reduced. In addition, the camera is better protected against certain climatic phenomena, for example frost, which will be more likely to be deposited on the mechanical protection screen than on the optics of the optical sensor. The protection device according to the invention may further comprise one or more of the following characteristics taken alone or in combination: The mechanical protection screen may be made of a rigid material. Alternatively, the mechanical protection screen is made of a flexible elastic material. The mechanical protection screen comprises for example a pivoting flap.
    [0003] The pivoting flap can be held by gravity in its protective position. The pivoting flap can also be held by an elastic member, in particular a spring in its protective position.
    [0004] According to one embodiment, the mechanical protection screen comprises circular sectors of flexible material so as to form a diaphragm closing the protective housing in the protective position and bending outwards to release the field of view of the optical sensor in the retracted position. The device comprises for example at least one air jet nozzle in front of the optical sensor, the projection nozzle being arranged in a side wall and connected to an air discharge pump via a discharge pipe so that the air projected by the air jet nozzle is flush with the optical sensor. The device comprises for example an even number of projection nozzles, the projection nozzles being arranged two to two diametrically opposite with respect to the optical sensor. In particular, the device may comprise at least one projection nozzle of which at least one component of the jet is directed towards the mechanical protection screen. The air flow at the outlet of the projection nozzle is for example a laminar air flow.
    [0005] The device may comprise a heating element disposed in the discharge pipe. The air discharge pump comprises for example an air intake inside the passenger compartment of a motor vehicle.
    [0006] The invention also relates to a rear vision system for a motor vehicle comprising an optical sensor and a device as defined above.
    [0007] Other advantages and features will become apparent upon reading the description of the invention, as well as the accompanying drawings, in which: FIG. 1 is a schematic cross-sectional view of a first embodiment of the device according to the invention; FIG. 2 is a view identical to that of FIG. 1 with the air discharge pump in operation; FIG. 3 is a diagrammatic view of a second embodiment of the device according to the invention; FIG. 4 is a schematic view of a third embodiment of the device according to the invention; FIG. 5 is a schematic view of a fourth embodiment of the device according to the invention, FIG. 6 is a schematic view of a fifth embodiment of the device according to the invention; FIG. 7 is a diagrammatic cross-sectional front view of a sixth embodiment of the device according to the invention, FIG. 8 is a schematic view of the sixth embodiment embodiment with the mechanical protection screen in closed position.
    [0008] In these figures, the identical elements bear the same reference numbers. FIGS. 1 and 2 show a rear vision system 1 for a motor vehicle comprising an optical sensor 3 and a protection device 5 for this sensor 3. FIG. 1 shows the device 5 stopped while FIG. device 5 in working condition. The optical sensor 3 is for example a camera intended to be mounted at the rear of a motor vehicle, for example at a bumper or a license plate (not shown). The optical sensor 3 comprises for example a convex optical 7 (curved) such as fish eye optics ("fish-eye" in English). As can be seen in FIG. 1, the protection device 5 comprises at least one air jet nozzle 9 disposed in front of the optical sensor 3. As can be seen in FIG. 2, the airflow is directed in one direction substantially perpendicular to the optical axis 11 of the optical sensor 3. In the present example, the airflow is directed from top to bottom towards the floor (not shown). The projection nozzle 9 is thus disposed on one side of the optical sensor 3 so that the projected air is flush with the optical sensor 3, in particular its convex optics 7.
    [0009] To form a kind of air curtain shielding the dirt, the air flow at the outlet of the spray nozzle 9 is a laminar air flow.
    [0010] The projection nozzle 9 is supplied with air by an air discharge pump 13 and is connected to an air outlet thereof via a delivery line 15. The discharge pump 13 is for example made in the form of an air blower, in particular with a roller or a propeller, or a compressor. In the context of a heavy goods vehicle, the pump may be the compressed air compressor of the vehicle for the braking system with its compressed air tank. An optional heating element 17 is provided in the discharge line 15. The heating element 17 may be, for example, an electric heating resistor or a PTC ceramic component. This is particularly advantageous for performing a quick defrost or drying of the convex optic 7 of the sensor 3. The delivery pump 13 can be arranged further, for example inside the passenger compartment. For this purpose, the air discharge pump has an air intake 19 inside the passenger compartment of a motor vehicle. Thus, the air blown towards the optical sensor 3 is already filtered and conditioned in particular temperature and humidity by the air conditioning system of the vehicle.
    [0011] As seen in FIG. 1, the optical sensor 3 is installed inside a protective housing 21, more specifically at the bottom 23. The bottom 23 of the protective housing 21 may be formed by a wall specific or by the front face of the sensor 3 carrying the optic 7 of the latter. The protective housing 21 further has at least one side wall 27, in particular a cylindrical wall if the housing 21 is of cylindrical shape or four side walls for a housing 21 of rectangular shape. To protect the optical sensor 3, particularly when the vehicle is stationary or if the rear view system 1 is not in operation, the protection device 5 comprises a mechanical protection screen 31 arranged in front of the sensor 3 and can take a protective position (see Figure 1) in which the mechanical screen 31 closes the housing 3027006 WFR2163 8 protection 21 and a retracted position (see Figure 2) in which the mechanical screen 31 releases the field of vision of the optical sensor 3. The displacement of the mechanical protection screen 31 between the two positions is operated by the air injected by the air discharge pump 13 into the protective housing 21. In fact, the injection of the air creates an overpressure so that the air projected by the nozzle 9 (see arrows 29) moves the mechanical protection screen 31 from its protective position (Figure 1) to the retracted position (Figure 2). According to the example of FIG. 1, the mechanical protection screen 31 is made of a rigid material, for example a plastic or metal material. This is for example a pivoting flap which is hinged by a hinge 33 on the side wall 27, for example on the upper side wall 35 so that it is held by gravity in its lowered protection position (FIG. 1). According to a variant not shown, the air is injected directly into the protective housing 21 via the discharge pipe 5 without nozzle 9. FIG. 3 shows a second embodiment of the protection device 5. This embodiment differs from that of Figures 1 and 2 in that the mechanical shield 31 is made of a flexible elastic material, for example a silicone skin.
    [0012] In order to guarantee the lowering of the screen 31, it may have at its lower end, opposite to that which is attached to the casing 21, a ballast 37. This embodiment functions in the same manner as that of the figures. 1 and 2. Figure 4 shows a third embodiment. In this FIG. 4, the optical sensor 3 is seen from the front of the center of the protection housing 21, that is to say one looks in a direction parallel to the optical axis 11. According to this embodiment, the device 5 comprises an even number of projection nozzles 9, here four, and the projection nozzles 9 are arranged two by two diametrically opposite with respect to the optical sensor 3.
    [0013] Thus, an air flow issuing from the protection box 21 is created which is substantially parallel to the optical axis 11, which favors the clearance of the field of view of the sensor 3 by retracting the protection screen 31. which is not represented in this figure. Figure 5 shows a fourth embodiment. In this FIG. 5, the optical sensor 3 is seen from the front of the protective housing 21, that is to say one looks in a direction parallel to the optical axis 11. According to this embodiment, the device comprises at least one, in this case five nozzles 9 projection. Among these nozzles 9, there are three 92, of which at least one component of the jet is directed towards the mechanical protection screen 31.
    [0014] This arrangement makes it possible to reinforce the action of retraction of the screen 31 by injected air flows. Figure 6 shows a fifth embodiment. In this figure 6, we see the optical sensor 3 in cross section from above. The mechanical protection screen 31 is in this embodiment 15 formed by two rigid flaps 310 and 312 which are, viewed from the front, articulated laterally by hinges 331 and 332 each provided with an elastic element, in particular a spring for example helical, to maintain the flaps 331 and 332 in their protective position. In this exemplary embodiment, the protection device comprises two nozzles 9 directed towards the flaps 331 and 332 to open them more effectively. Figures 7 and 8 show a sixth embodiment. In these figures 7 and 8, we see the optical sensor 3 from the front of the center of the protective housing 21, that is to say we look in a direction parallel to the optical axis 11. For a better understanding, the protection screen 31 has not been shown in Figure 7 while Figure 8 shows the device 5 with the shield 31 in its closed position. The optical sensor 31 is therefore behind the screen 31 and is not visible in this figure 8.
    [0015] According to this embodiment, the mechanical protection screen 31 is made by circular sectors 350 of flexible material so as to form a diaphragm closing the housing 21 of protection in the protective position and 3027006 WFR2163 10 bending towards the outside to release the field of view of the optical sensor 31 in the retracted position. This embodiment is distinguished by its simplicity of assembly and its low cost while providing effective protection to the optical sensor 3.
    [0016] It will thus be understood that the protection device 5 according to the invention makes it possible to protect the optical sensor 3 both when the rear vision system is not working and when the latter is in operation, without requiring the installation of motors or complex commands. Of course, other variations are possible beyond the scope of the present invention. Thus, for example, certain features of the various embodiments may be combined.
    权利要求:
    Claims (15)
    [0001]
    REVENDICATIONS1. Protective device (5) for an optical sensor (3) comprising: - an optical sensor (3) - a protective case (21), the optical sensor (3) being installed inside (23) of the case ( 21), - a mechanical protection screen (31; 331; 332; 350) disposed opposite the optical sensor (3) and able to assume a protective position in which the mechanical screen (31; 331; 332; 350); closes the protective casing (21) and a retracted position in which the mechanical screen (31; 331; 332; 350) releases the field of view of the optical sensor (3), characterized in that it comprises a discharge pump of air (13) connected via a discharge line (15) to the protective housing (21) for injecting air into the protective housing (21) so that the air injected moves the mechanical protection screen (31; 331; 332; 350) from its protective position to the retracted position.
    [0002]
    2. Device according to claim 1, characterized in that the mechanical screen (31; 331; 332) of protection is made of a rigid material.
    [0003]
    3. Device according to claim 1, characterized in that the mechanical shield (31; 350) is made of a flexible elastic material.
    [0004]
    4. Device according to claim 1 or 2, characterized in that the mechanical shield (31; 331; 332) comprises a pivoting flap.
    [0005]
    5. Device according to any one of claims 1 to 4, characterized in that the pivoting flap (31) is held by gravity in its protective position. 3027006 WFR2163 12
    [0006]
    6. Device according to any one of claims 1 to 4, characterized in that the pivoting flap (331, 332) is held by an elastic member, in particular a spring in its protective position. 5
    [0007]
    7. Device according to claim 3, characterized in that the mechanical protection screen (31) comprises circular sectors of flexible material (350) so as to form a diaphragm closing the protective housing (21) in the protective position and bending outwardly to release the field of view of the optical sensor (3) in the retracted position.
    [0008]
    8. Device according to any one of claims 1 to 7, characterized in that it comprises at least one nozzle (9) of air projection in front of the optical sensor (3), the nozzle (9) projection being arranged in a side wall (27) and connected to an air discharge pump (13) via a discharge pipe (15) so that the air projected by the air jet nozzle (9) is flush with the sensor optical (3). 20
    [0009]
    9. Device according to claim 8, characterized in that it comprises an even number of nozzles (9) projection, the projection nozzles being arranged two by two diametrically opposite with respect to the optical sensor (3). 25
    [0010]
    10. Device according to any one of claims 1 to 9, characterized in that it comprises at least one nozzle (9) projection (92), at least one component of the jet is directed towards the mechanical screen of protection (31; 331; 332; 350). 30
    [0011]
    11. Device according to any one of claims 8 to 10, characterized in that the air flow at the outlet of the spray nozzle (9, 92) is a laminar air flow. 3027006 WFR2163 13
    [0012]
    12. Device according to any one of claims 1 to 11, characterized in that it comprises a heating element (17) disposed in the discharge pipe (15). 5
    [0013]
    13. Device according to any one of claims 1 to 12, characterized in that the air discharge pump (13) comprises an air intake (19) inside the passenger compartment of a motor vehicle .
    [0014]
    14. Rear vision system (1) for a motor vehicle comprising an optical sensor (3) and a device (5) according to any one of claims 1 to 13.
    [0015]
    15
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    JP2012201122A|2011-03-23|2012-10-22|Asmo Co Ltd|Nozzle device for vehicle-mounted camera, vehicle-mounted camera with cleaning device, and cleaning system for vehicle-mounted camera|WO2017202625A1|2016-05-27|2017-11-30|Valeo Systèmes d'Essuyage|System for cleaning an optical sensor, set comprising a system of said type, and associated motor vehicle|
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    US10328906B2|2014-04-11|2019-06-25|Dlhbowles, Inc.|Integrated automotive system, compact, low-profile nozzle assembly and compact fluidic circuit for cleaning a wide-angle image sensor's exterior surface|
    US10350647B2|2011-03-10|2019-07-16|Dlhbowles, Inc.|Integrated automotive system, nozzle assembly and remote control method for cleaning an image sensor's exterior or objective lens surface|
    US10432827B2|2011-03-10|2019-10-01|Dlhbowles, Inc.|Integrated automotive system, nozzle assembly and remote control method for cleaning an image sensors exterior or objective lens surface|
    US10525937B2|2014-04-16|2020-01-07|Dlhbowles, Inc.|Integrated multi image sensor and lens washing nozzle assembly and method for simultaneously cleaning a plurality of image sensors|
    EP3677479A4|2017-08-30|2021-08-25|Koito Manufacturing Co., Ltd.|Air cleaner for vehicles|
    DE102020123971A1|2020-09-15|2022-03-17|Bayerische Motoren Werke Aktiengesellschaft|Protection device for an optical element of a motor vehicle|
    法律状态:
    2015-11-02| PLFP| Fee payment|Year of fee payment: 2 |
    2016-04-15| PLSC| Publication of the preliminary search report|Effective date: 20160415 |
    2016-10-28| PLFP| Fee payment|Year of fee payment: 3 |
    2017-10-31| PLFP| Fee payment|Year of fee payment: 4 |
    2018-10-30| PLFP| Fee payment|Year of fee payment: 5 |
    2019-10-31| PLFP| Fee payment|Year of fee payment: 6 |
    2021-07-09| ST| Notification of lapse|Effective date: 20210605 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1459713A|FR3027006B1|2014-10-10|2014-10-10|DEVICE FOR PROTECTING AN OPTICAL SENSOR|FR1459713A| FR3027006B1|2014-10-10|2014-10-10|DEVICE FOR PROTECTING AN OPTICAL SENSOR|
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