WO2021018658A1 - Optical detection system for a motor vehicle - Google Patents

Optical detection system for a motor vehicle Download PDF

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Publication number
WO2021018658A1
WO2021018658A1 PCT/EP2020/070492 EP2020070492W WO2021018658A1 WO 2021018658 A1 WO2021018658 A1 WO 2021018658A1 EP 2020070492 W EP2020070492 W EP 2020070492W WO 2021018658 A1 WO2021018658 A1 WO 2021018658A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical detection
detection system
rotor
camera
stator
Prior art date
Application number
PCT/EP2020/070492
Other languages
French (fr)
Inventor
Frédéric BRETAGNOL
Marcel Trebouet
Nicolas PINCHON
Denis Garnier
Original Assignee
Valeo Systèmes d'Essuyage
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systèmes d'Essuyage filed Critical Valeo Systèmes d'Essuyage
Publication of WO2021018658A1 publication Critical patent/WO2021018658A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/56—Cleaning windscreens, windows or optical devices specially adapted for cleaning other parts or devices than front windows or windscreens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00—Methods preventing fouling
    • B08B17/02—Preventing deposition of fouling or of dust
    • B08B17/06—Preventing deposition of fouling or of dust by giving articles subject to fouling a special shape or arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Definitions

  • TITLE OPTICAL DETECTION SYSTEM FOR MOTOR VEHICLES
  • the invention relates to the field of devices for assisting the driving of motor vehicles, and, in particular, to devices for assisting driving comprising an optical sensor such as, for example, a camera comprising a lens, the latter comprising at least one optical lens.
  • an optical sensor such as, for example, a camera comprising a lens, the latter comprising at least one optical lens.
  • Front, rear or side vision cameras are fitted to a large number of motor vehicles, for example with the aim of providing the driver of the vehicle with
  • such cameras are generally installed outside vehicles, in different places depending on the desired use, for example at a front or rear bumper, or at the level of a license plate at the front or rear of the vehicle. In these positions, these cameras are strongly exposed to projections of dirt and / or mineral or organic dust which can be deposited on their optics and, thus, reduce their efficiency, or even render them inoperative. In particular, in rainy weather, projections of rain and / or dirt entrained by the raindrops can greatly affect the operability of the driving assistance device comprising such a camera.
  • Such cleaning systems generally include, in particular, one or more nozzles arranged in the vicinity of the optic to be cleaned and configured to project thereon one or more cleaning fluids, the role of which is to evacuate, by entraining them, the dust and / or dirt deposited on the optics of the camera in question.
  • cleaning systems involve, in particular, the implementation, within the vehicle, of a storage of the cleaning fluid (s), as well as of pipes for conveying this or these fluids to the camera in question. They therefore generate both a heavier vehicle and an increase in its operating costs.
  • a device which comprises, on the one hand, a housing mounted movable in rotation about an axis of rotation and in which is housed an optical sensor such as a camera, and which comprises, on the other hand, a transparent protection element, integral with the mobile housing in rotation, arranged in the field of vision of the optical sensor.
  • Such a device also comprises an actuator coupled to the housing for rotating the housing and the protection element, thus allowing the removal of dust and dirt deposited on the transparent protection element by centrifugal effect.
  • Such a device therefore proposes cleaning by centrifugal effect, not of the lens (s) of the camera considered, but of the transparent protective element of the housing in which the camera is received and which forms a barrier against projections. that can reach one or more lenses of this camera.
  • the camera is therefore, here, fixed, and it is the housing in which it is received which, driven in rotation, drives with it the transparent protective element and constitutes the device for cleaning the optics of the camera.
  • the protection element although transparent and designed to be optically neutral, nevertheless forms a surface interposed between the optical sensor in question and the exterior, a surface the presence of which may, under certain conditions, for example, of lighting and / or sunlight, distort and / or modify the image acquired by the optical sensor.
  • the assembly described by the aforementioned document has a size which is hardly compatible with the installation constraints of optical sensors intended for motor vehicles.
  • the object of the invention is to propose an alternative to optical detection systems comprising a cleaning solution by centrifugal effect which is less optically penalizing and of reduced bulk.
  • the invention relates to an optical detection system for a motor vehicle, characterized in that it comprises a camera, a distal lens of which is arranged at a distance from a body housing electronic components of the optical detection system. , the distal lens being rotatably mounted to be rotated at high speed by a drive device.
  • the detection system comprises a camera consisting of a camera body and an optical assembly comprising one or more lenses, including a lens, arbitrarily designated, regardless of the number of lenses that comprises the optical assembly of the camera, as a "distal lens" in what follows, which is located furthest from the camera body and therefore directly in front of the scene from which the camera is intended to take one or more views, c 'that is to say directly with regard to the external environment from which the camera must take one or more views. More precisely, at least one surface of the aforementioned distal lens, designated in what follows as the external surface, is directly in contact with the external environment of which the camera is intended to take one or more. views. In a case where the camera comprises a plurality of lenses, the distal lens is that which comprises the external surface as defined above and which, therefore, is the one which is the most exposed to dirt, dust and raindrops.
  • the body of the camera and the distal lens are coaxial, their common axis being substantially, up to manufacturing and assembly tolerances, coincident with an optical axis of the camera.
  • the term “longitudinal” will denote, in what follows, the direction of the aforementioned optical axis, and the name “front” will denote the region of the optical detection system according to the invention located, according to the aforementioned longitudinal direction, on the side of the previously defined distal lens, that is to say on the side of the external environment of a vehicle equipped with an optical detection system according to the invention, external environment of which the camera is intended to take one or more shots.
  • the term “rear” will denote, in what follows, the region opposite, in the longitudinal direction, to “the front” as defined above. It should be noted that the concepts of front and rear apply regardless of the location and orientation of the optical detection system according to the invention in a motor vehicle, and that they are therefore unrelated to the concepts of front or rear of such a vehicle.
  • the distal lens is arranged at a distance from the body of the camera. More precisely, the invention provides for the distal lens and the body of the camera to extend in the extension of one another in the longitudinal direction defined above, at a distance from one another in this direction, that is to say also in the direction of the optical axis of the camera.
  • the invention provides, moreover, that the distal lens is rotatably mounted so as to be driven in rotation at high speed by a drive device while the camera body remains stationary.
  • high speed should first of all be understood to mean a speed of rotation of the order of several thousand revolutions per minute, for example a speed of rotation of the order of 10000 revolutions / minute, such a speed of rotation being sought in order to be able to benefit from the effect of the centrifugal force to eject from the distal lens, and, more precisely, from its external surface as defined above, dust, dirt and / or drops of water or snow which are there possibly present.
  • the front lens itself constitutes a component of a camera cleaning member.
  • the camera and its distal lens are fixed, housed in a housing which, driven in rotation, itself constitutes a part of a member for cleaning the camera
  • camera and member cleaning of the distal lens of the camera are here closely interwoven in the detection system according to the invention, via a common component, namely the distal lens.
  • the invention therefore makes it possible to eliminate the transparent protective element, thereby simplifying and reducing the cost of the optical detection system, and ensuring, in all circumstances, that an image of the external environment of the device is obtained. vehicle not disturbed by the interposition of the transparent protection element mentioned above.
  • the axis of rotation of the distal lens is substantially coincident, within manufacturing and assembly tolerances, with an optical axis of the camera.
  • the device for driving the distal lens in rotation has an axis of rotation which is substantially coincident with the optical axis of the distal lens of the camera. More precisely, the drive device and the distal lens are substantially aligned along the longitudinal direction defined above.
  • the drive device comprises a motor which comprises a fixed stator, integral with the body of the camera, and a rotor movable in rotation with respect to the stator, the axis of rotation of the rotor being substantially coincident. with the axis of rotation of the distal lens, and the rotor being made mechanically integral with the distal lens. More precisely, the invention provides that the distal lens is driven in rotation by the rotation of the rotor of the aforementioned drive motor.
  • the drive motor can be a small electric motor, or even a miniature electric motor, that is to say, by way of non-exhaustive examples, a stepping motor, an actuator, a direct current motor. with or without brushes, an asynchronous motor or a synchronous motor of low mass, for example less than 100 grams.
  • the rotor can comprise one or more permanent magnets
  • the stator can comprise one or more electromagnetic coils, supplied electrically to allow the drive in rotation of the permanent magnet (s) integral with the rotor and, thus, the drive of the rotor in rotation.
  • the camera body houses, for example, electronic components allowing the power supply to the aforementioned coils and controlling the rotation of the rotor.
  • the rotor and the stator respectively comprise electromagnetic members including at least one coil whose power supply is controlled to drive the rotor at high speed, said electromagnetic members extending around the distal lens.
  • the rotor comprises an end wall in the center of which the distal lens is fixed, and a plurality of annular walls defining an at least partial reception cavity of the stator.
  • the motor rotor is placed around the motor stator.
  • the stator is therefore received in a cavity arranged in the rotor, coaxially with the latter.
  • the distal lens is directly received in a reception housing arranged in the rotor itself, coaxially with the latter.
  • the rotor and the stator respectively comprise electromagnetic members including at least one coil whose power supply is controlled to drive the rotor at high speed, said members
  • electromagnetic systems extending axially away from the distal lens and the rotor being extended, towards the front of the optical detection system, by a housing rotatably integral with the rotor and configured to house the camera body and to support the distal lens .
  • the rotor is extended towards the front of the optical detection system by an intermediate piece forming a housing and configured in particular to house the body of the camera and to support the front lens.
  • the invention provides that the housing at least partially surrounds the body of the camera, and that the distal lens is received in a receiving housing arranged in this housing, coaxially with the rotor.
  • the optical detection system according to the invention is longitudinally more compact according to the first exemplary embodiment than according to the exemplary embodiment in which the rotor is extended longitudinally, towards the front, by a housing in which is received the distal lens of the camera.
  • the stator of the motor previously defined comprises a reception tunnel configured to receive at least one lens of this camera.
  • the lens or lenses considered are lenses of the camera other than the distal lens defined above.
  • the stator of the motor therefore becomes, like the rotor thereof, to which the distal lens is mechanically integral, an integral part of the camera of the optical detection system according to the invention, further increasing the degree of nesting of these two elements together. This makes it possible, in particular, to further increase the compactness of the detection system according to the invention.
  • the stator of the motor is configured to receive a control assembly of the optical detection system according to the invention.
  • a control assembly comprises, for example, electronic components for supplying and controlling the engine.
  • the stator of the motor is itself a part of the body of the camera of the optical detection system according to the invention. This makes it possible to further increase the compactness of the detection system according to the invention.
  • the camera body can extend back from the rotor / stator assembly and can accommodate electronic components specific to the camera control.
  • an optical detection system incorporates means of cleaning by centrifugal effect, without adding a transparent cover element and with a minimum bulk of a rotor / stator assembly allowing the rotation. at high speed to generate the centrifugal effect, these cleaning means being produced by rotating a distal lens of the optical detection system.
  • the invention also extends to a motor vehicle equipped with at least one optical detection system as has just been described. It should therefore be noted that, as indicated
  • an optical detection system is preferably installed in a region of a motor vehicle less exposed to projections of dirt, debris or dust, as, for example, a license plate or a front bumper of such a vehicle.
  • an optical detection system according to the invention such as
  • Figure 1 is a schematic sectional view, along a plane containing the optical axis of the camera of an optical detection system according to the invention, of a first embodiment of such an optical detection system
  • Figure 2 is a schematic perspective view of the rotor, seen from the rear, fitted to the optical detection system of Figure 1,
  • FIG 3 is a schematic perspective view of the stator, seen from the front, equipping the optical detection system of Figure 1,
  • Figure 4 is a schematic perspective view of the optical detection system of Figure 1, and
  • Figure 5 is a schematic sectional view, along a plane containing the optical axis of the camera of an optical detection system according to the invention, of an alternative embodiment of such an optical detection system.
  • the optical detection system 500 of a motor vehicle capable of analyzing a road scene for a driving assistance system, comprises a camera 100 consisting of a body 1, shown schematically in FIG. 1, and d 'a lens 2 comprising an optical assembly formed of a plurality of optical lenses 3.
  • the lenses 3 are arranged aligned along an X axis of the camera 100, the X axis which will be designated, in the following, as the optical axis and the longitudinal axis of the camera 100, as well as the longitudinal axis of the optical detection system 500 as a whole.
  • the optical lenses 3 comprise a distal lens 30 and a plurality of lenses 31, the distal lens 30 and the lenses 31 being coaxial with the X axis and aligned in the direction of the latter, with the distal lens 30 which is arranged at one end of this alignment of optical lenses, facing the outside of the vehicle and the road scene to be analyzed.
  • the distal lens 30 is the lens of the camera 100 which is directly exposed to the environment outside the optical detection system 500 of which the camera 100 is intended to take one or more. multiple views.
  • the front of the optical detection system 500 extends, in the longitudinal direction of the X axis, on the side located towards the distal lens 30, and it is, on all of the figures, represented by the direction of the arrow Fl.
  • the rear of the optical detection system 500 extends, in the longitudinal direction of the X axis, away from the front, and it is, in all the figures, represented by the direction of the arrow F2.
  • the camera and more particularly the optical assembly, is configured so that the distal lens 30 is rotatably mounted to be rotated by a drive device 200 while the plurality of lenses 31 remains stationary.
  • the drive device 200 comprises in particular an electric motor which comprises a rotor 40, movable in rotation and made integral with the distal lens 30, and a stator 41 mounted fixed relative to the rotor 40.
  • the rotor 40 is coaxial with the longitudinal axis / optical axis X previously defined, and it comprises in particular an end wall 400 which is substantially perpendicular, with the manufacturing tolerances close, to the previously defined longitudinal axis X, from which extend, substantially parallel to the aforementioned X axis, towards the rear of the optical detection system 500, an outer annular wall 401 of substantially cylindrical shape and a wall inner annular 402 of substantially cylindrical shape, the outer annular wall 401 and the inner annular wall 402 being coaxial with axis X.
  • the inner annular wall 402 of the rotor 40 is closer to the longitudinal axis X than the outer annular wall 401, that is, a diameter of the inner annular wall 402 is less than a diameter of the outer annular wall 401.
  • the interior will refer, in which follows, to elements close to the longitudinal axis X in a radial direction perpendicular thereto, "the exterior” referring to elements more distant from the latter in such a radial direction.
  • the dimension, in the longitudinal direction, of the outer annular wall 401 is greater than the dimension, in the longitudinal direction, of the inner annular wall 402
  • End wall 400, outer annular wall 401 and inner annular wall 402 together define a substantially annular housing 408 sized to receive a coil-magnet assembly capable of rotating the rotor relative to the stator and which will be described in more detail below.
  • the substantially annular housing 408 is delimited by the end wall 400, an inner surface 401b of the outer annular wall 401 and an outer surface 402a of the inner annular wall 402.
  • the rotor 40 is pierced with an opening 404 which is substantially centered, to within manufacturing tolerances, on the longitudinal axis X previously defined. More precisely, according to this exemplary embodiment, the opening 400 is delimited by a substantially cylindrical sleeve 405 of axis X, which extends the end wall 400 substantially perpendicularly thereto and in the direction of the rear of the system. optical detection 500. In the example illustrated, at its rear end, the sleeve 405 is closed by a wall 405a that is substantially parallel, with manufacturing tolerances close, to the end wall 400, in which the opening 404 is pierced. The sleeve 405 defines, in the rotor 40, a hollow housing 406 pierced, towards the rear of the optical detection system 500, with the aforementioned opening 404.
  • the distal lens 30 of the camera 100 is received in the hollow housing 406. More specifically, the invention provides that the distal lens 30 is mechanically secured to the rotor 40. and in particular of the sleeve 405 which delimits the reception housing 406 defined above. The distal lens is thus integral in rotation with the rotor 40.
  • An interior surface 405b of the sleeve 405 is configured to receive the distal lens 30 in abutment, such that the optical axis of the latter is substantially coincident, within manufacturing and assembly tolerances, with the longitudinal axis X previously. defined.
  • the front lens 30 can be attached by gluing in the sleeve 405, or the interior surface 405b of the sleeve 405 can be configured to receive the front lens 30 in a set of grooves, cutouts and seals not shown on the figure. figure 1.
  • the distal lens 30 is received in the rotor 40 in such a way that it forms a sealed closure of the opening. 404, previously defined, of the rotor 40, relative to the rear of the optical detection system 500.
  • the distal lens 30 is therefore an integral part of the rotor 40, or, according to another point of view, the rotor 40 of the drive device 200, supporting the front lens 30, becomes a component of the camera 100 of the optical detection system 500.
  • the rotor 40 comprises one or more permanent magnets 407 arranged annularly around the longitudinal axis X.
  • the permanent magnets 407 are arranged projecting from the outer surface 402a of the inner annular wall 402, so as to extend into the substantially cylindrical housing 408. It follows from the above that the longitudinal axis X of the optical detection system 500 , which is also, as indicated above, the optical axis of the lenses 3, 30, 31, of the camera 100, is also the axis of rotation of the rotor 40.
  • stator 41 of the drive device 200 fixed relative to the rotor 40, is placed at least in part within the cavity defined by the rotor 40, previously defined.
  • stator 41 is received in the rotor 40, coaxially with the latter.
  • the stator 41 is a complex part of revolution, of axis X, which comprises in particular, with reference to the orientations and names previously defined, a tail 410 and, with reference to the orientations and names previously defined, a front part configured to cooperate with the rotor 40. More particularly, the front part of the stator comprises the electromagnetic means able to cooperate with the permanent magnets of the rotor to control the rotation of the latter. And tail 410 is configured to cooperate with some or all of the primary and secondary lenses of the camera, i.e., lenses other than the distal lens.
  • the stator comprises a base 413 arranged between the tail 410 and the front part, which extend on either side of this base 413. More particularly, the front part of the stator 41 comprises an outer annular portion 411 and an annular portion interior 412, substantially cylindrical, coaxial with axis X, and which extend forwardly from the base 413 and away from the tail 410. As shown more particularly in Figures 1 and 3, the base 413 has the general shape of a disc centered on the X axis, and its outer diameter is slightly less than an inner diameter of the outer annular wall 401 of the rotor 40, in such a way that the outer annular portion 411 of the stator 41 is, in the optical detection system 500, engaged within the cavity 403 formed in the volume of the rotor.
  • the outer annular portion 411 of the stator 41 is, in the optical detection system 500, engaged in the housing 408 delimited by the outer annular wall 401 and by the inner annular wall 402 of the rotor 40, and an outer surface 41 la of the outer annular portion 411 of the stator 41 is placed substantially against an inner surface 401b, previously defined, of the rotor 40.
  • the outer diameter of the outer annular portion 411 of the stator 41 and the inner diameter of the outer annular wall 401 of the rotor 40 are defined in such a way that a minimum clearance exists between these two elements, in order to allow rotation without friction of the rotor 40 around the stator 41, and this, in a minimum radial space requirement.
  • the outer annular portion 411 of the stator 41 comprises, at one end of its inner surface 411b opposite the base 413, one or more indentations configured to receive one or more electromagnetic coils 414 of the stator 41.
  • electromagnetic 414 are fixed to the inner surface 41 lb of the outer annular portion 411 of the stator 41, housed in the housing 408.
  • the electromagnetic coils 414 are, in a radial direction perpendicular to the longitudinal axis X, arranged opposite the permanent magnets 407 integral in rotation with the rotor.
  • the electromagnetic coils 414 When the electromagnetic coils 414 are supplied with an electric current, they generate a rotating electromagnetic field which makes it possible to drive the rotation of the permanent magnets 407 and therefore of the rotor 40, as well as the distal lens 30 mechanically integral with the latter.
  • the optical detection system 500 comprises one or more bearings 420 inserted between the rotor 40 and the stator 4L
  • a bearing 420 of the annular ball bearing type the main axis of rotation of which coincides. with longitudinal axis X, can be inserted between rotor 40 and stator 4L
  • a double ball bearing 420 is inserted between the inner annular wall 402 of the rotor 40 and the inner annular portion 412 of the stator 4L More precisely, the bearing 420 is inserted into a counterbore arranged in an outer surface 412a of the inner annular portion 412 of the stator 41, and this bearing bears against an inner surface 402b of the inner annular wall 402 of the rotor 40.
  • the bearing (s) 420 are configured to allow high speed rotation of the rotor 40 relative to the stator 41: typically, the desired rotation speeds for the rotor 40 are several thousand revolutions per minute, for example of the order of 10,000 revolutions per minute.
  • the optical detection system 500 also comprises an element 430 arranged between the rotor 40 and the stator 41, at the level of the opening of the cavity 403 formed in the volume of the rotor, configured for, on the one hand, to ensure the sealing of the housing 408, previously defined, with regard to the outside of the optical detection system 500, and, on the other hand, to allow the high speed rotation of the rotor 40 relative to to the stator 41.
  • the element 430 is, for example, a rotary joint disposed in a groove, a part of which is arranged in a rear surface 401c of the outer annular wall 401 of the rotor 40 and of which a part is arranged in a rear surface 41 le of the outer annular portion 411 of the stator 41.
  • the stator 41 is configured to receive several lenses 31 of the camera 100 of the optical detection system 500. More precisely, as shown in FIG. 1 , the stator 41 is pierced, in the longitudinal direction, with a substantially cylindrical tunnel 415, coaxial with the longitudinal axis X of the optical detection system 500, and which extends
  • the tunnel 415 opens out at each longitudinal end of the stator 41.
  • tunnel 415 is configured to house, substantially
  • the tunnel 415 accommodates, from the rear towards the front of the optical detection system 500 , a plurality of primary lenses 31a of substantially the same diameters, arranged at a distance from each other in the longitudinal direction previously defined, and two secondary lenses, respectively 31b, 31c, the diameters of which are greater than the diameters of the primary lenses 31a, the diameter of the secondary lenses increasing as they move away from the primary lenses.
  • the secondary lenses 31b, 31c are respectively received in countersinks arranged in a front surface 413a of the previously defined base 413, the primary lenses 31a possibly being, according to various examples, glued inside the tunnel 415, or inserted into grooves or cutouts arranged in an outer surface 415a thereof.
  • the stator 41 which serves as a support for the primary and secondary lenses 31, 31a, 31b, 31c, therefore constitutes an integral part of the objective 2 of the camera 100.
  • FIG. 1 clearly illustrates the compactness of the optical detection system 500 according to the invention and its ease of installation in the small size of a motor vehicle.
  • the optical detection system 500 also comprises, housed in the housing 408 previously defined, a control assembly 440 comprising electronic components configured to supply power.
  • the body 1 of the optical detection system 500 is shown here schematically. It should be noted that it can house in particular electronic components configured in particular to control the operation of the camera and the acquisition of images. These electronic components can also include means for processing the acquired images, to determine a need for cleaning of the optical system and therefore of the distal lens, and communication means for sending an instruction to rotate the electric motor to the components. electronics arranged in housing 408.
  • the camera 100 and the training device 200 share common components which therefore provide both a function within the camera 100 and a function within the camera 100.
  • the distal lens 30 also plays a role of cleaning the optical assembly of the camera 100.
  • the rotor 40 besides its function of high-speed rotation to achieve the centrifugal effect sought for cleaning the distal lens 30, plays a supporting role for the latter.
  • the stator 41 in addition to its function in the drive device 200, plays a supporting role for part of the lenses 31, 31a, 31b, 31c, of the camera 100, as well as a role of receiving the lens.
  • control assembly 440 previously defined, thus fulfilling a function of the body 1 of the camera 100.
  • the invention therefore makes it possible to produce a compact optical detection system 500, of which various components simultaneously fulfill several functions, thus making it possible to reduce manufacturing and assembly costs. Furthermore, in the optical detection system 500 according to the invention, the cleaning of the distal lens 30, exposed to the projection of dirt, dust and / or drops of rain or snow, is carried out by centrifugal effect thanks to the setting in high speed rotation of said distal lens 30, without the need for addition of cleaning fluid.
  • FIG. 4 clearly illustrates the compactness of the optical detection system 500 according to the invention and therefore its ease of installation in the small footprint of a motor vehicle. In this figure 4, it is notable that the rotor has been removed to make visible from the front of the optical detection system the cooperation between the magnets, visible in figure 4, and the electromagnetic coils.
  • the rotor 40 comprises 8 permanent magnets 407 angularly regularly distributed around the inner periphery of the rotor 40, and the outer annular portion 411 of the stator 41 is configured to receive 12 electromagnetic coils 414 angularly regularly distributed around the inner periphery of this outer annular portion 411.
  • FIG. 5 illustrates, in section along a plane containing the previously defined longitudinal axis X, an alternative embodiment of an optical detection system 500 according to the invention.
  • the camera 100, its body 1 and its distal lens 30, as well as the rotor 40, movable in rotation about the longitudinal axis X and the stator 41 fixed relative to the rotor 40, the permanent magnets 407 of the rotor 40 and the electromagnetic coils 414 of the stator 4L Are also represented in this FIG. 5, the arrows Fl and F2 previously described, respectively illustrating the front and rear directions, previously defined, of the optical detection system 500.
  • the rotor / stator assembly is axially offset from the camera.
  • the body 1 of the camera 100 extends from front to rear of the optical detection system 500, and it is in particular integral with a sleeve 10 coaxial with the rotor 40 and the stator 41, passing through the latter right through, in the longitudinal direction.
  • the optical detection system 500 comprises a housing 5 which extends, with reference to the names and orientations defined above, in front of the rotor 40 and which is mechanically integral with the latter.
  • the housing 5 extends longitudinally, towards the front of the optical detection system 500, the rotor 40.
  • the housing 5 is a part of revolution, the axis of which is substantially, except for manufacturing and assembly tolerances, coincides with the longitudinal axis X previously defined, and which comprises a substantially cylindrical sleeve 50 and an end portion of form
  • substantially frustoconical 51 substantially frustoconical 51.
  • the substantially cylindrical sleeve 50 has an outer diameter substantially equal to that of the rotor 40, and it is made integral in rotation, at its rear longitudinal end, with the outer annular wall 401 of the rotor 40.
  • the cylindrical sleeve 50 can be mechanically made integral with the rotor 40 by gluing, clipping, screwing, or by any other suitable means, insofar as this mechanical connection is sealed and allows driving in rotation at high speed.
  • the end part 51 of the housing 5, of substantially frustoconical shape has an axis of revolution substantially coincident, with the manufacturing and assembly tolerances close, with the longitudinal axis X previously mentioned, and it extends, with reference to the names and previously defined orientations, towards the front of the optical detection system 500, by extending the cylindrical sleeve 50.
  • the diameter of the end part 51 decreases from the end through which the latter is attached to the cylindrical sleeve 50 towards the front end of the optical detection system 500.
  • the cylindrical sleeve 50 and the end part 51 together define a cavity 515 in which is housed a part of the body 1 of the camera 100 of the optical detection system 500.
  • the The aforementioned cavity 515 can receive one or more lenses 31, not shown in FIG. 5, of the camera 100.
  • the end part 51 is, at its front end, of smaller diameter, pierced with an opening 510 centered on the longitudinal axis X of the optical detection system 500. More precisely , the extremal part 51 forms, around the aforementioned opening 510, a substantially cylindrical tube 511, of axis X, which extends, in the longitudinal direction, towards the rear of the optical detection system 500, that is to say towards the interior of the previously defined cavity 515.
  • the tube 511 is configured to receive the distal lens 30 of the camera 100. More specifically, the distal lens 30 of the camera 100 is arranged on a substantially cylindrical support 300, the diameter of which is defined to be slightly less than an internal diameter of the tube 511, in such a way that the support 300 can be inserted without difficulty into the aforementioned tube 511, while having minimal radial play with the internal walls of this tube.
  • the sealed mechanical connection of the front lens 30 with the intermediate part 5 can be produced by gluing or by screwing the support 300 into the tube 511 of the intermediate part 5.
  • a groove 512 can also, as shown in the figure 5, be arranged at the periphery of the opening 510 and configured to receive a seal intended to ensure, on the one hand, the mechanical connection between the front lens 30 and the intermediate part 5 and, on the other hand, the sealing of the cavity 515 previously described with respect to the environment outside the optical detection system 500.
  • the support 300 comprises a substantially frustoconical skirt 301 configured to press down, when the support 300 of the distal lens 30 is received in the opening 510 and in the aforementioned tube 511, against the end
  • the high-speed drive of the rotor 40 generates the high-speed rotation of the housing and the distal lens 30 secured to this housing 5.
  • the optical detection system 500 is less compact than according to the exemplary embodiments illustrated by FIGS. 1 to 4.
  • the exemplary embodiment illustrated by FIG. 5 may however allow the use of cameras. trade in which only the distal lens 30 is moved to be placed at the front end of the intermediate piece 5 previously described. Such a configuration can therefore present a compromise in terms of manufacturing costs, in which the advantages of the invention in terms of cleaning of the distal lens 30 and of the quality of the images obtained are retained.
  • the invention achieves the goals it had set itself and allows, by simple means, to achieve a compact optical detection system 500, including cleaning a lens distal 30 of a camera 100 that it comprises is produced by centrifugal effect, such an optical detection system further guaranteeing, by the absence of a surface interposed between the aforementioned distal lens 30 and the environment outside the optical detection system 500, the reproducibility and reliability of the images obtained by the camera 100.
  • the invention cannot however be limited to the means and configurations described and illustrated, and it also applies to all equivalent means or configurations and to any combination of such means.
  • the optical detection system described and illustrated here has, as well as its components, a symmetry of revolution, the invention applies to any form of optical detection system, insofar as it has, as well as its components, the functional characteristics described in this document.

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Abstract

The invention relates to an optical detection system (500) for a motor vehicle. The optical detection system (500) according to the invention comprises a camera (100), a distal lens (30) of which is located at a distance from a body (1) accommodating electronic components of the optical detection system (500), the distal lens (30) being rotatably mounted for rotation at high speed by a drive device (200).

Description

DESCRIPTION DESCRIPTION
TITRE : SYSTÈME DE DÉTECTION OPTIQUE POUR VÉHICULE AUTOMOBILE TITLE: OPTICAL DETECTION SYSTEM FOR MOTOR VEHICLES
L’invention se rapporte au domaine des dispositifs d'assistance à la conduite de véhicules automobiles, et, notamment, aux dispositifs d'assistance à la conduite comportant un capteur optique tel que, par exemple, une caméra comprenant un objectif, ce dernier comprenant au moins une lentille optique. The invention relates to the field of devices for assisting the driving of motor vehicles, and, in particular, to devices for assisting driving comprising an optical sensor such as, for example, a camera comprising a lens, the latter comprising at least one optical lens.
Des caméras de vision avant, arrière, ou latérales équipent un grand nombre de véhicules automobiles, par exemple dans le but de fournir au conducteur du véhicule une aide au Front, rear or side vision cameras are fitted to a large number of motor vehicles, for example with the aim of providing the driver of the vehicle with
stationnement ou une information de détection d'un franchissement de ligne. Afin d'optimiser leur angle de vue, de telles caméras sont généralement installées à l'extérieur des véhicules, en différents endroits selon l'utilisation souhaitée, par exemple au niveau d'un pare-chocs avant ou arrière, ou au niveau d'une plaque d'immatriculation avant ou arrière du véhicule. Dans ces positions, ces caméras sont fortement exposées aux projections de saletés et/ou poussières minérales ou organiques qui peuvent se déposer sur leurs optiques et, ainsi, réduire leur efficacité, voire les rendre inopérantes. En particulier, par temps de pluie, des projections de pluie et/ou de saletés entraînées par les gouttes de pluie peuvent grandement affecter l'opérabilité du dispositif d'assistance à la conduite comprenant une telle caméra. parking or lane crossing detection information. In order to optimize their viewing angle, such cameras are generally installed outside vehicles, in different places depending on the desired use, for example at a front or rear bumper, or at the level of a license plate at the front or rear of the vehicle. In these positions, these cameras are strongly exposed to projections of dirt and / or mineral or organic dust which can be deposited on their optics and, thus, reduce their efficiency, or even render them inoperative. In particular, in rainy weather, projections of rain and / or dirt entrained by the raindrops can greatly affect the operability of the driving assistance device comprising such a camera.
Pour pallier cet inconvénient, il est possible de mettre en œuvre un système de nettoyage de l'optique d'une telle caméra. De tels systèmes de nettoyage comprennent généralement, notamment, un ou plusieurs gicleurs agencés au voisinage de l'optique à nettoyer et configurés pour y projeter un ou plusieurs fluides de nettoyage dont le rôle est d'évacuer, en les entraînant, les poussières et/ou salissures déposées sur l'optique de la caméra considérée. De tels systèmes de nettoyage impliquent toutefois, notamment, la mise en œuvre, au sein du véhicule, d'un stockage du ou des fluides de nettoyage, ainsi que de canalisations d'acheminement de ce ou ces fluides jusqu'à la caméra considérée. Ils génèrent donc à la fois un alourdissement du véhicule et une augmentation de ses coûts de fonctionnement. To overcome this drawback, it is possible to implement a system for cleaning the optics of such a camera. Such cleaning systems generally include, in particular, one or more nozzles arranged in the vicinity of the optic to be cleaned and configured to project thereon one or more cleaning fluids, the role of which is to evacuate, by entraining them, the dust and / or dirt deposited on the optics of the camera in question. However, such cleaning systems involve, in particular, the implementation, within the vehicle, of a storage of the cleaning fluid (s), as well as of pipes for conveying this or these fluids to the camera in question. They therefore generate both a heavier vehicle and an increase in its operating costs.
On connaît également, par exemple par le document WO2018/019662, un dispositif qui comporte, d'une part, un boîtier monté mobile en rotation autour d'un axe de rotation et dans lequel est logé un capteur optique tel qu'une caméra, et qui comporte, d'autre part, un élément de protection transparent, solidaire du boîtier mobile en rotation, disposé dans le champ de vision du capteur optique. Un tel dispositif comporte également un actionneur couplé au boîtier pour entraîner en rotation le boîtier et l'élément de protection, permettant ainsi l'élimination des poussières et salissures déposées sur l'élément de protection transparent par effet centrifuge. Un tel dispositif propose donc un nettoyage par effet centrifuge, non pas de la ou des lentilles de la caméra considérée, mais de l'élément de protection transparent du boîtier dans lequel la caméra est reçue et qui forme une barrière à l'encontre des projections pouvant atteindre une ou plusieurs lentilles de cette caméra. La caméra est donc, ici, fixe, et c'est le boîtier dans lequel elle est reçue qui, entraîné en rotation, entraîne avec lui l'élément de protection transparent et constitue le dispositif de nettoyage de l'optique de la caméra. Also known, for example from document WO2018 / 019662, is a device which comprises, on the one hand, a housing mounted movable in rotation about an axis of rotation and in which is housed an optical sensor such as a camera, and which comprises, on the other hand, a transparent protection element, integral with the mobile housing in rotation, arranged in the field of vision of the optical sensor. Such a device also comprises an actuator coupled to the housing for rotating the housing and the protection element, thus allowing the removal of dust and dirt deposited on the transparent protection element by centrifugal effect. Such a device therefore proposes cleaning by centrifugal effect, not of the lens (s) of the camera considered, but of the transparent protective element of the housing in which the camera is received and which forms a barrier against projections. that can reach one or more lenses of this camera. The camera is therefore, here, fixed, and it is the housing in which it is received which, driven in rotation, drives with it the transparent protective element and constitutes the device for cleaning the optics of the camera.
L'élément de protection, bien que transparent et prévu pour être optiquement neutre, forme malgré tout une surface interposée entre le capteur optique considéré et l'extérieur, surface dont la présence peut, sous certaines conditions, par exemple, d'éclairage et/ou d'ensoleillement, déformer et/ou modifier l'image acquise par le capteur optique. En outre, l'ensemble décrit par le document précité présente un encombrement peu compatible avec les contraintes d'implantation des capteurs optiques destinés aux véhicules automobiles. The protection element, although transparent and designed to be optically neutral, nevertheless forms a surface interposed between the optical sensor in question and the exterior, a surface the presence of which may, under certain conditions, for example, of lighting and / or sunlight, distort and / or modify the image acquired by the optical sensor. In addition, the assembly described by the aforementioned document has a size which is hardly compatible with the installation constraints of optical sensors intended for motor vehicles.
L'invention a pour but de proposer une alternative aux systèmes de détection optique comportant une solution de nettoyage par effet centrifuge qui soit moins pénalisante optiquement et d'un encombrement réduit. The object of the invention is to propose an alternative to optical detection systems comprising a cleaning solution by centrifugal effect which is less optically penalizing and of reduced bulk.
Dans ce but, l'invention a pour objet un système de détection optique pour un véhicule automobile, caractérisé en ce qu'il comprend une caméra dont une lentille distale est agencée à distance d'un corps logeant des composants électroniques du système de détection optique, la lentille distale étant montée rotative pour être entraînée en rotation à grande vitesse par un dispositif d'entraînement. To this end, the invention relates to an optical detection system for a motor vehicle, characterized in that it comprises a camera, a distal lens of which is arranged at a distance from a body housing electronic components of the optical detection system. , the distal lens being rotatably mounted to be rotated at high speed by a drive device.
Il faut comprendre ici que le système de détection selon l'invention comprend une caméra constituée d'un corps de caméra et d'un ensemble optique comportant une ou plusieurs lentilles, dont une lentille, arbitrairement désignée, quel que soit le nombre de lentilles que comporte l’ensemble optique de la caméra, comme "lentille distale" dans ce qui suit, qui se trouve la plus éloignée du corps de caméra et donc directement au regard de la scène dont la caméra est destinée à prendre une ou plusieurs vues, c'est-à-dire directement au regard de l'environnement extérieur dont la caméra doit prendre une ou plusieurs vues. Plus précisément, une surface au moins de la lentille distale précitée, désignée, dans ce qui suit, comme surface externe, est directement en contact avec l'environnement extérieur dont la caméra est destinée à prendre une ou plusieurs vues. Dans un cas où la caméra comporte une pluralité de lentilles, la lentille distale est celle qui comporte la surface externe telle que précédemment définie et qui, donc, est celle qui est la plus exposée aux salissures, poussières et gouttes de pluie. It should be understood here that the detection system according to the invention comprises a camera consisting of a camera body and an optical assembly comprising one or more lenses, including a lens, arbitrarily designated, regardless of the number of lenses that comprises the optical assembly of the camera, as a "distal lens" in what follows, which is located furthest from the camera body and therefore directly in front of the scene from which the camera is intended to take one or more views, c 'that is to say directly with regard to the external environment from which the camera must take one or more views. More precisely, at least one surface of the aforementioned distal lens, designated in what follows as the external surface, is directly in contact with the external environment of which the camera is intended to take one or more. views. In a case where the camera comprises a plurality of lenses, the distal lens is that which comprises the external surface as defined above and which, therefore, is the one which is the most exposed to dirt, dust and raindrops.
Avantageusement, le corps de la caméra et la lentille distale sont coaxiaux, leur axe commun étant sensiblement, aux tolérances de fabrication et d'assemblage près, confondu avec un axe optique de la caméra. Advantageously, the body of the camera and the distal lens are coaxial, their common axis being substantially, up to manufacturing and assembly tolerances, coincident with an optical axis of the camera.
En référence à ce qui précède, le terme "longitudinal" désignera, dans ce qui suit, la direction de l'axe optique précité, et la dénomination "avant" désignera la région du système de détection optique selon l'invention située, selon la direction longitudinale précitée, du côté de la lentille distale précédemment définie, c'est-à-dire du côté de l'environnement extérieur d'un véhicule équipé d'un système de détection optique selon l'invention, environnement extérieur dont la caméra est destinée à prendre une ou plusieurs vues. Complémentairement, le terme "arrière" désignera, dans ce qui suit, la région opposée, selon la direction longitudinale, à "l'avant" tel que précédemment défini. Il est à noter que les notions d'avant et d'arrière s'appliquent quelles que soient l'implantation et l'orientation du système de détection optique selon l'invention dans un véhicule automobile, et qu'elles sont donc sans rapport avec les notions d'avant ou d'arrière d'un tel véhicule. With reference to the foregoing, the term "longitudinal" will denote, in what follows, the direction of the aforementioned optical axis, and the name "front" will denote the region of the optical detection system according to the invention located, according to the aforementioned longitudinal direction, on the side of the previously defined distal lens, that is to say on the side of the external environment of a vehicle equipped with an optical detection system according to the invention, external environment of which the camera is intended to take one or more shots. Additionally, the term “rear” will denote, in what follows, the region opposite, in the longitudinal direction, to “the front” as defined above. It should be noted that the concepts of front and rear apply regardless of the location and orientation of the optical detection system according to the invention in a motor vehicle, and that they are therefore unrelated to the concepts of front or rear of such a vehicle.
Tel que cela a été précisé précédemment, la lentille distale est agencée à distance du corps de la caméra. Plus précisément, l'invention prévoit que la lentille distale et le corps de la caméra s'étendent dans le prolongement l'un de l'autre selon la direction longitudinale précédemment définie, à distance l'un de l'autre selon cette direction, c'est-à-dire aussi selon la direction de l'axe optique de la caméra. As has been specified previously, the distal lens is arranged at a distance from the body of the camera. More precisely, the invention provides for the distal lens and the body of the camera to extend in the extension of one another in the longitudinal direction defined above, at a distance from one another in this direction, that is to say also in the direction of the optical axis of the camera.
Tel que cela a été également précisé précédemment, l'invention prévoit, par ailleurs, que la lentille distale est montée rotative pour être entraînée en rotation à grande vitesse par un dispositif d'entraînement tandis que le corps de la caméra reste fixe. Il faut tout d'abord entendre par "grande vitesse" une vitesse de rotation de l'ordre de plusieurs milliers de tours par minute, par exemple une vitesse de rotation de l'ordre de lOOOOtours/minute, une telle vitesse de rotation étant recherchée afin de pouvoir bénéficier de l'effet de la force centrifuge pour éjecter de la lentille distale, et, plus précisément, de sa surface externe telle que précédemment définie, des poussières, salissures et/ou gouttes d'eau ou de neige qui y seraient éventuellement présentes. As was also specified previously, the invention provides, moreover, that the distal lens is rotatably mounted so as to be driven in rotation at high speed by a drive device while the camera body remains stationary. The term "high speed" should first of all be understood to mean a speed of rotation of the order of several thousand revolutions per minute, for example a speed of rotation of the order of 10000 revolutions / minute, such a speed of rotation being sought in order to be able to benefit from the effect of the centrifugal force to eject from the distal lens, and, more precisely, from its external surface as defined above, dust, dirt and / or drops of water or snow which are there possibly present.
Il résulte de ce qui précède que, selon l'invention, la lentille avant constitue elle-même un composant d'un organe de nettoyage de la caméra. A l'inverse de l'art antérieur, par exemple décrit par le document WO2018/019662 précédemment évoqué, dans lequel la caméra et sa lentille distale sont fixes, logées dans un boîtier qui, entraîné en rotation, constitue lui-même une partie d'un organe de nettoyage de la caméra, caméra et organe de nettoyage de la lentille distale de la caméra sont ici intimement imbriqués dans le système de détection selon l'invention, par l'intermédiaire d'un composant commun, à savoir la lentille distale. It follows from the foregoing that, according to the invention, the front lens itself constitutes a component of a camera cleaning member. Unlike the prior art, for example described by the document WO2018 / 019662 mentioned above, in which the camera and its distal lens are fixed, housed in a housing which, driven in rotation, itself constitutes a part of a member for cleaning the camera, camera and member cleaning of the distal lens of the camera are here closely interwoven in the detection system according to the invention, via a common component, namely the distal lens.
L'invention permet donc la suppression de l'élément de protection transparent, réalisant ainsi une simplification et une réduction de coût du système de détection optique, et garantissant, en toutes circonstances, l'obtention d'une image de l'environnement extérieur du véhicule non perturbée par l'interposition de l'élément de protection transparent précédemment évoqué. The invention therefore makes it possible to eliminate the transparent protective element, thereby simplifying and reducing the cost of the optical detection system, and ensuring, in all circumstances, that an image of the external environment of the device is obtained. vehicle not disturbed by the interposition of the transparent protection element mentioned above.
Selon une caractéristique de l’invention, l'axe de rotation de la lentille distale est sensiblement confondu, aux tolérances de fabrication et d'assemblage près, avec un axe optique de la caméra. En d'autres termes, le dispositif d'entraînement en rotation de la lentille distale comporte un axe de rotation qui est sensiblement confondu avec l'axe optique de la lentille distale de la caméra. Plus précisément, le dispositif d'entraînement et la lentille distale sont sensiblement alignés selon la direction longitudinale précédemment définie. According to one characteristic of the invention, the axis of rotation of the distal lens is substantially coincident, within manufacturing and assembly tolerances, with an optical axis of the camera. In other words, the device for driving the distal lens in rotation has an axis of rotation which is substantially coincident with the optical axis of the distal lens of the camera. More precisely, the drive device and the distal lens are substantially aligned along the longitudinal direction defined above.
Selon une caractéristique de l'invention, le dispositif d'entraînement comprend un moteur qui comporte un stator fixe, solidaire du corps de la caméra, et un rotor mobile en rotation par rapport au stator, l'axe de rotation du rotor étant sensiblement confondu avec l'axe de rotation de la lentille distale, et le rotor étant rendu mécaniquement solidaire de la lentille distale. Plus précisément, l'invention prévoit que la lentille distale est entraînée en rotation par la rotation du rotor du moteur d'entraînement précité. According to one characteristic of the invention, the drive device comprises a motor which comprises a fixed stator, integral with the body of the camera, and a rotor movable in rotation with respect to the stator, the axis of rotation of the rotor being substantially coincident. with the axis of rotation of the distal lens, and the rotor being made mechanically integral with the distal lens. More precisely, the invention provides that the distal lens is driven in rotation by the rotation of the rotor of the aforementioned drive motor.
Le moteur d'entraînement peut être un moteur électrique de petite taille, voire un moteur électrique miniature, c'est-à-dire, à titre d'exemples non exhaustifs, un moteur pas à pas, un actuateur, un moteur à courant continu avec ou sans balais, un moteur asynchrone ou un moteur synchrone de faible masse, par exemple inférieure à 100 grammes. The drive motor can be a small electric motor, or even a miniature electric motor, that is to say, by way of non-exhaustive examples, a stepping motor, an actuator, a direct current motor. with or without brushes, an asynchronous motor or a synchronous motor of low mass, for example less than 100 grams.
Notamment, le rotor peut comprendre un ou plusieurs aimants permanents, et le stator peut comprendre une ou plusieurs bobines électromagnétiques, alimentées électriquement pour permettre l'entraînement en rotation du ou des aimants permanents solidaires du rotor et, ainsi, l'entraînement du rotor en rotation. Le corps de la caméra loge, par exemple, des composants électroniques permettant l'alimentation électrique des bobines précitées et gouvernant la rotation du rotor. Selon une caractéristique de l’invention, le rotor et le stator comprennent respectivement des organes électromagnétiques dont au moins une bobine dont l’alimentation est pilotée pour entraîner à grande vitesse le rotor, lesdits organes électromagnétiques s’étendant autour de la lentille distale. In particular, the rotor can comprise one or more permanent magnets, and the stator can comprise one or more electromagnetic coils, supplied electrically to allow the drive in rotation of the permanent magnet (s) integral with the rotor and, thus, the drive of the rotor in rotation. The camera body houses, for example, electronic components allowing the power supply to the aforementioned coils and controlling the rotation of the rotor. According to one characteristic of the invention, the rotor and the stator respectively comprise electromagnetic members including at least one coil whose power supply is controlled to drive the rotor at high speed, said electromagnetic members extending around the distal lens.
Selon une caractéristique de l’invention, le rotor comporte une paroi d’extrémité au centre de laquelle la lentille distale est fixée, et une pluralité de parois annulaires définissant une cavité de réception au moins partielle du stator. According to a characteristic of the invention, the rotor comprises an end wall in the center of which the distal lens is fixed, and a plurality of annular walls defining an at least partial reception cavity of the stator.
En d’autres termes, le rotor du moteur est placé autour du stator de ce dernier. Le stator est donc reçu dans une cavité agencée dans le rotor, coaxialement avec ce dernier. Ceci permet notamment de réduire les dimensions radiales du système de détection selon l'invention tout en conservant des possibilités de mise en œuvre d'une lentille avant de grandes dimensions et, donc, présentant un champ de vision étendu. In other words, the motor rotor is placed around the motor stator. The stator is therefore received in a cavity arranged in the rotor, coaxially with the latter. This makes it possible in particular to reduce the radial dimensions of the detection system according to the invention while retaining the possibilities of using a front lens of large dimensions and, therefore, having a wide field of vision.
Plus précisément, selon cet exemple, la lentille distale est directement reçue dans un logement de réception agencé dans le rotor lui-même, coaxialement avec celui-ci. Selon un autre exemple de réalisation, et en référence aux dénominations précédemment définies, le rotor et le stator comprennent respectivement des organes électromagnétiques dont au moins une bobine dont l’alimentation est pilotée pour entraîner à grande vitesse le rotor, lesdits organes More precisely, according to this example, the distal lens is directly received in a reception housing arranged in the rotor itself, coaxially with the latter. According to another exemplary embodiment, and with reference to the previously defined names, the rotor and the stator respectively comprise electromagnetic members including at least one coil whose power supply is controlled to drive the rotor at high speed, said members
électromagnétiques s’étendant axialement à distance de la lentille distale et le rotor étant prolongé, vers l'avant du système de détection optique, par un boîtier solidaire en rotation du rotor et configuré pour loger le corps de la caméra et pour supporter la lentille distale. electromagnetic systems extending axially away from the distal lens and the rotor being extended, towards the front of the optical detection system, by a housing rotatably integral with the rotor and configured to house the camera body and to support the distal lens .
En d’autres termes, le rotor est prolongé vers l'avant du système de détection optique par une pièce intermédiaire formant boîtier et configurée notamment pour loger le corps de la caméra et pour supporter la lentille avant. Plus précisément, selon cet exemple, l'invention prévoit que le boîtier entoure au moins partiellement le corps de la caméra, et que la lentille distale est reçue dans un logement de réception agencé dans ce boîtier, coaxialement avec le rotor. Il apparaît clairement que le système de détection optique selon l'invention est longitudinalement plus compact selon le premier exemple de réalisation que selon l'exemple de réalisation dans lequel le rotor est prolongé longitudinalement, vers l'avant, par un boîtier dans lequel est reçue la lentille distale de la caméra. In other words, the rotor is extended towards the front of the optical detection system by an intermediate piece forming a housing and configured in particular to house the body of the camera and to support the front lens. More precisely, according to this example, the invention provides that the housing at least partially surrounds the body of the camera, and that the distal lens is received in a receiving housing arranged in this housing, coaxially with the rotor. It clearly appears that the optical detection system according to the invention is longitudinally more compact according to the first exemplary embodiment than according to the exemplary embodiment in which the rotor is extended longitudinally, towards the front, by a housing in which is received the distal lens of the camera.
Dans un cas dans lequel la caméra du système de détection selon l'invention comprend une pluralité de lentilles, parmi lesquelles des lentilles primaires et secondaires et la lentille distale agencée à distance de ces lentilles primaires et secondaires, le stator du moteur précédemment défini comprend un tunnel d'accueil configuré pour recevoir au moins une lentille de cette caméra. Il faut comprendre ici que la ou les lentilles considérées sont des lentilles de la caméra autres que la lentille distale précédemment définie. Selon une telle configuration, le stator du moteur devient donc, comme le rotor de celui-ci, duquel la lentille distale est mécaniquement solidaire, une partie intégrante de la caméra du système de détection optique selon l'invention, augmentant encore le degré d'imbrication de ces deux éléments ensemble. Ceci permet, notamment, d'augmenter encore la compacité du système de détection selon l'invention. In a case in which the camera of the detection system according to the invention comprises a plurality of lenses, among which are primary and secondary lenses and the distal lens arranged at a distance from these primary and secondary lenses, the stator of the motor previously defined comprises a reception tunnel configured to receive at least one lens of this camera. It should be understood here that the lens or lenses considered are lenses of the camera other than the distal lens defined above. According to such a configuration, the stator of the motor therefore becomes, like the rotor thereof, to which the distal lens is mechanically integral, an integral part of the camera of the optical detection system according to the invention, further increasing the degree of nesting of these two elements together. This makes it possible, in particular, to further increase the compactness of the detection system according to the invention.
Selon une caractéristique de l’invention, le stator du moteur est configuré pour recevoir un ensemble de commande du système de détection optique selon l'invention. Un tel ensemble de commande comprend, par exemple, des composants électroniques d'alimentation et de contrôle du moteur. En d'autres termes, selon cette caractéristique, le stator du moteur est lui-même une partie du corps de la caméra du système de détection optique selon l'invention. Ceci permet d'augmenter encore la compacité du système de détection selon l'invention. Le corps de la caméra peut s’étendre en retrait de l’ensemble rotor/stator et peut loger des composants électroniques spécifiques à la commande de la caméra. According to one characteristic of the invention, the stator of the motor is configured to receive a control assembly of the optical detection system according to the invention. Such a control assembly comprises, for example, electronic components for supplying and controlling the engine. In other words, according to this characteristic, the stator of the motor is itself a part of the body of the camera of the optical detection system according to the invention. This makes it possible to further increase the compactness of the detection system according to the invention. The camera body can extend back from the rotor / stator assembly and can accommodate electronic components specific to the camera control.
Tel qu’il vient d’être présenté, un système de détection optique intègre des moyens de nettoyage par effet centrifuge, sans ajout d’un élément de couverture transparent et avec un encombrement minimum d’un ensemble rotor/stator permettant la mise en rotation à grande vitesse pour générer l’effet centrifuge, ces moyens de nettoyage étant réalisés par mise en rotation d’une lentille distale du système de détection optique. As it has just been presented, an optical detection system incorporates means of cleaning by centrifugal effect, without adding a transparent cover element and with a minimum bulk of a rotor / stator assembly allowing the rotation. at high speed to generate the centrifugal effect, these cleaning means being produced by rotating a distal lens of the optical detection system.
L'invention s'étend également à un véhicule automobile équipé d'au moins un système de détection optique tel qu'il vient d'être décrit. Il est ainsi à noter que, comme indiqué The invention also extends to a motor vehicle equipped with at least one optical detection system as has just been described. It should therefore be noted that, as indicated
précédemment, à l'inverse des solutions proposées par l'art antérieur, aucun élément de protection n'est, selon l'invention, interposé entre la lentille avant précitée et l'environnement extérieur dont la caméra du système de détection optique selon l'invention est configurée pour prendre une ou plusieurs vues. Avantageusement, et afin de prolonger la durée de vie de la lentille avant précitée, l'invention prévoit qu'un tel système de détection optique est préférentiellement implanté dans une région d'un véhicule automobile moins exposée aux projections de salissures, débris ou poussières, que, par exemple, une plaque d'immatriculation ou un pare-chocs avant d'un tel véhicule. Selon un exemple, un système de détection optique selon l'invention, tel que previously, unlike the solutions proposed by the prior art, no protection element is, according to the invention, interposed between the aforementioned front lens and the external environment including the camera of the optical detection system according to invention is configured to take one or more views. Advantageously, and in order to extend the life of the aforementioned front lens, the invention provides that such an optical detection system is preferably installed in a region of a motor vehicle less exposed to projections of dirt, debris or dust, as, for example, a license plate or a front bumper of such a vehicle. According to one example, an optical detection system according to the invention, such as
précédemment décrit, sera préférentiellement installé à l'arrière du véhicule. D’autres caractéristiques, détails et avantages de l'invention apparaîtront plus clairement à l’aide de la description qui suit et des dessins parmi lesquels : previously described, will preferably be installed at the rear of the vehicle. Other characteristics, details and advantages of the invention will emerge more clearly with the aid of the following description and of the drawings, among which:
Figure 1 est une vue schématique en coupe, selon un plan contenant l'axe optique de la caméra d'un système de détection optique selon l'invention, d'un premier mode de réalisation d'un tel système de détection optique, Figure 1 is a schematic sectional view, along a plane containing the optical axis of the camera of an optical detection system according to the invention, of a first embodiment of such an optical detection system,
Figure 2 est une vue schématique en perspective du rotor, vue de l’arrière, équipant le système de détection optique de la figure 1, Figure 2 is a schematic perspective view of the rotor, seen from the rear, fitted to the optical detection system of Figure 1,
Figure 3 est une vue schématique en perspective du stator, vue de l’avant, équipant le système de détection optique de la figure 1, Figure 3 is a schematic perspective view of the stator, seen from the front, equipping the optical detection system of Figure 1,
Figure 4 est une vue schématique en perspective du système de détection optique de la figure 1, et Figure 4 is a schematic perspective view of the optical detection system of Figure 1, and
Figure 5 est une vue schématique en coupe, selon un plan contenant l'axe optique de la caméra d'un système de détection optique selon l'invention, d'un mode de réalisation alternatif d'un tel système de détection optique. Figure 5 is a schematic sectional view, along a plane containing the optical axis of the camera of an optical detection system according to the invention, of an alternative embodiment of such an optical detection system.
Il faut tout d'abord noter que si les figures exposent l'invention de manière détaillée pour sa mise en œuvre, elles peuvent bien entendu servir à mieux définir l'invention le cas échéant. Il est également à noter que, sur l'ensemble des figures, les éléments similaires et/ou remplissant la même fonction sont indiqués par le même repère. It should first of all be noted that if the figures set out the invention in detail for its implementation, they can of course be used to better define the invention if necessary. It should also be noted that, in all of the figures, elements that are similar and / or fulfill the same function are indicated by the same reference mark.
On va décrire dans un premier temps, en référence aux figures 1 et 2, un premier mode de réalisation d’un système de détection optique 500 selon l'invention. We will first describe, with reference to Figures 1 and 2, a first embodiment of an optical detection system 500 according to the invention.
Le système de détection optique 500 d’un véhicule automobile, susceptible d’analyser une scène de route pour un système d’assistance à la conduite, comprend une caméra 100 constituée d'un corps 1, représenté schématiquement sur la figure 1, et d'un objectif 2 comportant un ensemble optique formé d’une pluralité de lentilles optiques 3. Les lentilles 3 sont disposées alignées le long d'un axe X de la caméra 100, axe X qui sera désigné, dans ce qui suit, comme l’axe optique et l’axe longitudinal de la caméra 100, ainsi que l’axe longitudinal du système de détection optique 500 dans son ensemble. The optical detection system 500 of a motor vehicle, capable of analyzing a road scene for a driving assistance system, comprises a camera 100 consisting of a body 1, shown schematically in FIG. 1, and d 'a lens 2 comprising an optical assembly formed of a plurality of optical lenses 3. The lenses 3 are arranged aligned along an X axis of the camera 100, the X axis which will be designated, in the following, as the optical axis and the longitudinal axis of the camera 100, as well as the longitudinal axis of the optical detection system 500 as a whole.
Selon l'exemple plus particulièrement illustré par la figure 1, les lentilles optiques 3 comprennent une lentille distale 30 et une pluralité de lentilles 31, la lentille distale 30 et les lentilles 31 étant coaxiales d'axe X et alignées selon la direction de ce dernier, avec la lentille distale 30 qui est disposée à une extrémité de cet alignement de lentilles optiques, tournée vers l’extérieur du véhicule et la scène de route à analyser. Ainsi, dans le système de détection optique 500 selon l'invention, la lentille distale 30 est la lentille de la caméra 100 qui est directement exposée à l'environnement extérieur au système de détection optique 500 dont la caméra 100 est destinée à prendre une ou plusieurs vues. According to the example more particularly illustrated by FIG. 1, the optical lenses 3 comprise a distal lens 30 and a plurality of lenses 31, the distal lens 30 and the lenses 31 being coaxial with the X axis and aligned in the direction of the latter, with the distal lens 30 which is arranged at one end of this alignment of optical lenses, facing the outside of the vehicle and the road scene to be analyzed. Thus, in the optical detection system 500 according to the invention, the distal lens 30 is the lens of the camera 100 which is directly exposed to the environment outside the optical detection system 500 of which the camera 100 is intended to take one or more. multiple views.
En référence aux dénominations et orientations précédemment définies, l'avant du système de détection optique 500 s'étend, selon la direction longitudinale de l'axe X, du côté situé vers la lentille distale 30, et il est, sur l'ensemble des figures, représenté par le sens de la flèche Fl. With reference to the names and orientations defined above, the front of the optical detection system 500 extends, in the longitudinal direction of the X axis, on the side located towards the distal lens 30, and it is, on all of the figures, represented by the direction of the arrow Fl.
Complémentairement, l'arrière du système de détection optique 500 s'étend, selon la direction longitudinale de l'axe X, à l'opposé de l'avant, et il est, sur l'ensemble des figures, représenté par le sens de la flèche F2. Additionally, the rear of the optical detection system 500 extends, in the longitudinal direction of the X axis, away from the front, and it is, in all the figures, represented by the direction of the arrow F2.
Fa caméra, et plus particulièrement l’ensemble optique, est configurée de sorte que la lentille distale 30 est montée rotative pour être entraînée en rotation par un dispositif d'entraînement 200 tandis que la pluralité de lentilles 31 reste fixe. The camera, and more particularly the optical assembly, is configured so that the distal lens 30 is rotatably mounted to be rotated by a drive device 200 while the plurality of lenses 31 remains stationary.
Fe dispositif d'entraînement 200 comprend notamment un moteur électrique qui comporte un rotor 40, mobile en rotation et rendu solidaire de la lentille distale 30, et un stator 41 monté fixe par rapport au rotor 40. The drive device 200 comprises in particular an electric motor which comprises a rotor 40, movable in rotation and made integral with the distal lens 30, and a stator 41 mounted fixed relative to the rotor 40.
Plus précisément, en se référant notamment aux figures 1 et 2, le rotor 40 est coaxial avec l'axe longitudinal/axe optique X précédemment défini, et il comprend notamment une paroi d'extrémité 400 sensiblement perpendiculaire, aux tolérances de fabrication près, à l'axe longitudinal X précédemment défini, à partir de laquelle s'étendent, sensiblement parallèlement à l'axe X précité, en direction de l'arrière du système de détection optique 500, une paroi annulaire extérieure 401 de forme sensiblement cylindrique et une paroi annulaire intérieure 402 de forme sensiblement cylindrique, la paroi annulaire extérieure 401 et la paroi annulaire intérieure 402 étant coaxiales d'axe X. Fa paroi annulaire intérieure 402 du rotor 40 est plus proche de l'axe longitudinal X que la paroi annulaire extérieure 401, c'est-à-dire qu'un diamètre de la paroi annulaire intérieure 402 est inférieur à un diamètre de la paroi annulaire extérieure 401. Par extension, "l'intérieur" fera référence, dans ce qui suit, à des éléments proches de l'axe longitudinal X selon une direction radiale perpendiculaire à celui-ci, "l'extérieur' faisant référence à des éléments plus éloignés de ce dernier selon une telle direction radiale. Selon l'exemple, non exclusif, plus particulièrement illustré par les figures 1 et 2, la dimension, selon la direction longitudinale, de la paroi annulaire extérieure 401, est supérieure à la dimension, selon la direction longitudinale, de la paroi annulaire intérieure 402. Paroi d'extrémité 400, paroi annulaire extérieure 401 et paroi annulaire intérieure 402 délimitent ensemble un logement sensiblement annulaire 408 dimensionné pour recevoir un ensemble bobine-aimant apte à faire pivoter le rotor par rapport au stator et qui sera décrit plus en détails ci-après. Plus particulièrement, le logement sensiblement annulaire 408 est délimité par la paroi d’extrémité 400, une surface intérieure 401b de la paroi annulaire extérieure 401 et une surface extérieure 402a de la paroi annulaire intérieure 402. More precisely, with particular reference to FIGS. 1 and 2, the rotor 40 is coaxial with the longitudinal axis / optical axis X previously defined, and it comprises in particular an end wall 400 which is substantially perpendicular, with the manufacturing tolerances close, to the previously defined longitudinal axis X, from which extend, substantially parallel to the aforementioned X axis, towards the rear of the optical detection system 500, an outer annular wall 401 of substantially cylindrical shape and a wall inner annular 402 of substantially cylindrical shape, the outer annular wall 401 and the inner annular wall 402 being coaxial with axis X. The inner annular wall 402 of the rotor 40 is closer to the longitudinal axis X than the outer annular wall 401, that is, a diameter of the inner annular wall 402 is less than a diameter of the outer annular wall 401. By extension, "the interior" will refer, in which follows, to elements close to the longitudinal axis X in a radial direction perpendicular thereto, "the exterior" referring to elements more distant from the latter in such a radial direction. According to the example, not exclusive, more particularly illustrated by Figures 1 and 2, the dimension, in the longitudinal direction, of the outer annular wall 401, is greater than the dimension, in the longitudinal direction, of the inner annular wall 402 End wall 400, outer annular wall 401 and inner annular wall 402 together define a substantially annular housing 408 sized to receive a coil-magnet assembly capable of rotating the rotor relative to the stator and which will be described in more detail below. after. More particularly, the substantially annular housing 408 is delimited by the end wall 400, an inner surface 401b of the outer annular wall 401 and an outer surface 402a of the inner annular wall 402.
Le rotor 40 est percé d'une ouverture 404 sensiblement centrée, aux tolérances de fabrication près, sur l'axe longitudinal X précédemment défini. Plus précisément, selon cet exemple de réalisation, l’ouverture 400 est délimitée par un manchon 405 sensiblement cylindrique d'axe X, qui prolonge la paroi d’extrémité 400 sensiblement perpendiculairement à celle-ci et en direction de l'arrière du système de détection optique 500. Dans l’exemple illustré, à son extrémité arrière, le manchon 405 est fermé par une paroi 405a sensiblement parallèle, aux tolérances de fabrication près, à la paroi d'extrémité 400, dans laquelle est percée l'ouverture 404. Le manchon 405 délimite, dans le rotor 40, un logement creux 406 percé, vers l'arrière du système de détection optique 500, de l'ouverture 404 précitée. The rotor 40 is pierced with an opening 404 which is substantially centered, to within manufacturing tolerances, on the longitudinal axis X previously defined. More precisely, according to this exemplary embodiment, the opening 400 is delimited by a substantially cylindrical sleeve 405 of axis X, which extends the end wall 400 substantially perpendicularly thereto and in the direction of the rear of the system. optical detection 500. In the example illustrated, at its rear end, the sleeve 405 is closed by a wall 405a that is substantially parallel, with manufacturing tolerances close, to the end wall 400, in which the opening 404 is pierced. The sleeve 405 defines, in the rotor 40, a hollow housing 406 pierced, towards the rear of the optical detection system 500, with the aforementioned opening 404.
Selon l'exemple de réalisation plus particulièrement illustré par les figures 1 et 2, la lentille distale 30 de la caméra 100 est reçue dans le logement creux 406. Plus précisément, l'invention prévoit que la lentille distale 30 est mécaniquement solidaire du rotor 40 et notamment du manchon 405 qui délimite le logement de réception 406 précédemment défini. La lentille distale est ainsi solidaire en rotation du rotor 40. According to the exemplary embodiment more particularly illustrated by Figures 1 and 2, the distal lens 30 of the camera 100 is received in the hollow housing 406. More specifically, the invention provides that the distal lens 30 is mechanically secured to the rotor 40. and in particular of the sleeve 405 which delimits the reception housing 406 defined above. The distal lens is thus integral in rotation with the rotor 40.
Une surface intérieure 405b du manchon 405 est configurée pour recevoir en appui la lentille distale 30, de telle manière que l'axe optique de cette dernière soit sensiblement confondu, aux tolérances de fabrication et d'assemblage près, avec l'axe longitudinal X précédemment défini. Selon différentes variantes de réalisation, la lentille avant 30 peut être rapportée par collage dans le manchon 405, ou la surface intérieure 405b du manchon 405 peut être configurée pour recevoir la lentille avant 30 dans un ensemble de gorges, découpes et joints non représentés sur la figure 1. An interior surface 405b of the sleeve 405 is configured to receive the distal lens 30 in abutment, such that the optical axis of the latter is substantially coincident, within manufacturing and assembly tolerances, with the longitudinal axis X previously. defined. According to different variant embodiments, the front lens 30 can be attached by gluing in the sleeve 405, or the interior surface 405b of the sleeve 405 can be configured to receive the front lens 30 in a set of grooves, cutouts and seals not shown on the figure. figure 1.
Dans tous les cas, dans le système de détection optique 500 selon l'invention, tel qu'illustré par la figure 1, la lentille distale 30 est reçue dans le rotor 40 de telle manière qu'elle forme une fermeture étanche de l'ouverture 404, précédemment définie, du rotor 40, par rapport à l'arrière du système de détection optique 500. Selon cet exemple de réalisation, la lentille distale 30 est donc partie intégrante du rotor 40, ou, selon un autre point de vue, le rotor 40 du dispositif d'entraînement 200, supportant la lentille avant 30, devient un composant de la caméra 100 du système de détection optique 500. In all cases, in the optical detection system 500 according to the invention, as illustrated by FIG. 1, the distal lens 30 is received in the rotor 40 in such a way that it forms a sealed closure of the opening. 404, previously defined, of the rotor 40, relative to the rear of the optical detection system 500. According to this exemplary embodiment, the distal lens 30 is therefore an integral part of the rotor 40, or, according to another point of view, the rotor 40 of the drive device 200, supporting the front lens 30, becomes a component of the camera 100 of the optical detection system 500.
Comme le montrent plus particulièrement les figures 1 et 2, le rotor 40 comporte un ou plusieurs aimants permanents 407 agencés de manière annulaire autour de l'axe longitudinal X. Selon l'exemple, non exclusif, plus particulièrement illustré par la figure 1, les aimants permanents 407 sont agencés en saillie de la surface extérieure 402a de la paroi annulaire intérieure 402, de manière à s’étendre dans le logement sensiblement cylindrique 408. Il résulte de ce qui précède que l'axe longitudinal X du système de détection optique 500, qui est également, comme indiqué précédemment, axe optique des lentilles 3, 30, 31, de la caméra 100, est aussi axe de rotation du rotor 40. As shown more particularly in Figures 1 and 2, the rotor 40 comprises one or more permanent magnets 407 arranged annularly around the longitudinal axis X. According to the example, not exclusive, more particularly illustrated by Figure 1, the permanent magnets 407 are arranged projecting from the outer surface 402a of the inner annular wall 402, so as to extend into the substantially cylindrical housing 408. It follows from the above that the longitudinal axis X of the optical detection system 500 , which is also, as indicated above, the optical axis of the lenses 3, 30, 31, of the camera 100, is also the axis of rotation of the rotor 40.
En référence à la figure 1 et à la figure 3, le stator 41 du dispositif d'entraînement 200, fixe par rapport au rotor 40, est placé au moins en partie au sein de la cavité définie par le rotor 40, précédemment définie. En d'autres termes, selon l'exemple de réalisation privilégié, mais non exclusif, plus particulièrement illustré par la figure 1, le stator 41 est reçu dans le rotor 40, coaxialement avec celui-ci. With reference to FIG. 1 and to FIG. 3, the stator 41 of the drive device 200, fixed relative to the rotor 40, is placed at least in part within the cavity defined by the rotor 40, previously defined. In other words, according to the preferred, but not exclusive, embodiment, more particularly illustrated in FIG. 1, the stator 41 is received in the rotor 40, coaxially with the latter.
Le stator 41 est une pièce complexe de révolution, d'axe X, qui comprend notamment, en référence aux orientations et dénominations précédemment définies, une queue 410 et, en référence aux orientations et dénominations précédemment définies, une partie avant configurée pour coopérer avec le rotor 40. Plus particulièrement, la partie avant du stator comporte les moyens électromagnétiques aptes à coopérer avec les aimants permanents du rotor pour commander la rotation de celui-ci. Et la queue 410 est configurée pour coopérer avec tout ou partie des lentilles primaires et secondaires de la caméra, c’est-à-dire les lentilles autres que la lentille distale. The stator 41 is a complex part of revolution, of axis X, which comprises in particular, with reference to the orientations and names previously defined, a tail 410 and, with reference to the orientations and names previously defined, a front part configured to cooperate with the rotor 40. More particularly, the front part of the stator comprises the electromagnetic means able to cooperate with the permanent magnets of the rotor to control the rotation of the latter. And tail 410 is configured to cooperate with some or all of the primary and secondary lenses of the camera, i.e., lenses other than the distal lens.
Le stator comporte une base 413 agencée entre la queue 410 et la partie avant, qui s’étendent de part et d’autre de cette base 413. Plus particulièrement, la partie avant du stator 41 comporte une portion annulaire extérieure 411 et une portion annulaire intérieure 412, sensiblement cylindriques, coaxiales d'axe X, et qui s'étendent vers l'avant à partir de la base 413 et à l’opposé de la queue 410. Comme le montrent plus particulièrement les figures 1 et 3, la base 413 présente une forme générale de disque centré sur l’axe X, et son diamètre extérieur est légèrement inférieur à un diamètre intérieur de la paroi annulaire extérieure 401 du rotor 40, de telle manière que la portion annulaire extérieure 411 du stator 41 est, dans le système de détection optique 500, engagée au sein de la cavité 403 formée dans le volume du rotor. Plus précisément, la portion annulaire extérieure 411 du stator 41 est, dans le système de détection optique 500, engagé dans le logement 408 délimité par la paroi annulaire extérieure 401 et par la paroi annulaire intérieure 402 du rotor 40, et une surface extérieure 41 la de la portion annulaire extérieure 411 du stator 41 est sensiblement placée contre une surface intérieure 401b, précédemment définie, du rotor 40. Avantageusement, le diamètre extérieur de la portion annulaire extérieure 411 du stator 41 et le diamètre intérieur de la paroi annulaire extérieure 401 du rotor 40 sont définis de telle manière qu'un jeu minimal existe entre ces deux éléments, afin de permettre une rotation sans frottement du rotor 40 autour du stator 41, et ce, dans un encombrement radial minimal. The stator comprises a base 413 arranged between the tail 410 and the front part, which extend on either side of this base 413. More particularly, the front part of the stator 41 comprises an outer annular portion 411 and an annular portion interior 412, substantially cylindrical, coaxial with axis X, and which extend forwardly from the base 413 and away from the tail 410. As shown more particularly in Figures 1 and 3, the base 413 has the general shape of a disc centered on the X axis, and its outer diameter is slightly less than an inner diameter of the outer annular wall 401 of the rotor 40, in such a way that the outer annular portion 411 of the stator 41 is, in the optical detection system 500, engaged within the cavity 403 formed in the volume of the rotor. More precisely, the outer annular portion 411 of the stator 41 is, in the optical detection system 500, engaged in the housing 408 delimited by the outer annular wall 401 and by the inner annular wall 402 of the rotor 40, and an outer surface 41 la of the outer annular portion 411 of the stator 41 is placed substantially against an inner surface 401b, previously defined, of the rotor 40. Advantageously, the outer diameter of the outer annular portion 411 of the stator 41 and the inner diameter of the outer annular wall 401 of the rotor 40 are defined in such a way that a minimum clearance exists between these two elements, in order to allow rotation without friction of the rotor 40 around the stator 41, and this, in a minimum radial space requirement.
La portion annulaire extérieure 411 du stator 41 comporte, au niveau d’une extrémité de sa surface intérieure 411b opposée à la base 413, une ou plusieurs empreintes configurées pour recevoir une ou plusieurs bobines électromagnétiques 414 du stator 41. Les bobines The outer annular portion 411 of the stator 41 comprises, at one end of its inner surface 411b opposite the base 413, one or more indentations configured to receive one or more electromagnetic coils 414 of the stator 41. The coils
électromagnétiques 414 sont fixées sur la surface intérieure 41 lb de la portion annulaire extérieure 411 du stator 41, logée dans le logement 408. electromagnetic 414 are fixed to the inner surface 41 lb of the outer annular portion 411 of the stator 41, housed in the housing 408.
Il résulte de ce qui précède que les bobines électromagnétiques 414 sont, selon une direction radiale perpendiculaire à l'axe longitudinal X, agencées au regard des aimants permanents 407 solidaires en rotation du rotor. Lorsque les bobines électromagnétiques 414 sont alimentées par un courant électrique, elles génèrent un champ électromagnétique tournant qui permet d’entraîner la rotation des aimants permanents 407 et donc du rotor 40, ainsi que la lentille distale 30 mécaniquement solidaire de celui-ci. It follows from the foregoing that the electromagnetic coils 414 are, in a radial direction perpendicular to the longitudinal axis X, arranged opposite the permanent magnets 407 integral in rotation with the rotor. When the electromagnetic coils 414 are supplied with an electric current, they generate a rotating electromagnetic field which makes it possible to drive the rotation of the permanent magnets 407 and therefore of the rotor 40, as well as the distal lens 30 mechanically integral with the latter.
Afin de faciliter cette rotation, le système de détection optique 500 comprend un ou plusieurs roulements 420 insérés entre le rotor 40 et le stator 4L Selon un exemple, un roulement 420 du type roulement annulaire à billes, dont l'axe principal de rotation est confondu avec l'axe longitudinal X, peut être inséré entre le rotor 40 et le stator 4L In order to facilitate this rotation, the optical detection system 500 comprises one or more bearings 420 inserted between the rotor 40 and the stator 4L According to one example, a bearing 420 of the annular ball bearing type, the main axis of rotation of which coincides. with longitudinal axis X, can be inserted between rotor 40 and stator 4L
Selon l'exemple plus particulièrement illustré par la figure 1, un double roulement à billes 420 est inséré entre la paroi annulaire intérieure 402 du rotor 40 et la portion annulaire intérieure 412 du stator 4L Plus précisément, le roulement 420 est inséré dans un lamage agencés dans une surface extérieure 412a de la portion annulaire intérieure 412 du stator 41, et ce roulement est en appui contre une surface intérieure 402b de la paroi annulaire intérieure 402 du rotor 40. According to the example more particularly illustrated by FIG. 1, a double ball bearing 420 is inserted between the inner annular wall 402 of the rotor 40 and the inner annular portion 412 of the stator 4L More precisely, the bearing 420 is inserted into a counterbore arranged in an outer surface 412a of the inner annular portion 412 of the stator 41, and this bearing bears against an inner surface 402b of the inner annular wall 402 of the rotor 40.
Avantageusement, le ou les roulements 420 sont configurés pour permettre une rotation à grande vitesse du rotor 40 par rapport au stator 41 : typiquement, les vitesses de rotation recherchées pour le rotor 40 sont de plusieurs milliers de tours par minute, par exemple de l'ordre de 10000 tours par minute. Mécaniquement solidaire du rotor 40 et, selon l'exemple plus particulièrement illustré par la figure 1, directement intégrée à ce dernier, la lentille distale 30 est donc également entraînée en rotation à grande vitesse : sous l'effet de la force centrifuge, d'éventuelles poussières, salissures et/ou gouttes de pluie ou de neige éventuellement présentes sur sa surface avant 30a, exposée à l'environnement extérieur au système de détection optique 500, peuvent alors être éjectées de ladite surface avant 30a, réalisant ainsi un nettoyage de cette surface. Advantageously, the bearing (s) 420 are configured to allow high speed rotation of the rotor 40 relative to the stator 41: typically, the desired rotation speeds for the rotor 40 are several thousand revolutions per minute, for example of the order of 10,000 revolutions per minute. Mechanically integral with the rotor 40 and, according to the example more particularly illustrated in FIG. 1, directly integrated into the latter, the distal lens 30 is therefore also driven in rotation at high speed: under the effect of centrifugal force, of any dust, dirt and / or rain or snow drops that may be present on its front surface 30a, exposed to the environment outside the optical detection system 500, can then be ejected from said front surface 30a, thus cleaning this area.
Il est à noter que, complémentairement aux roulements 420, le système de détection optique 500 comprend également un élément 430 agencé entre le rotor 40 et le stator 41, au niveau de l’ouverture de la cavité 403 ménagée dans le volume du rotor, configuré pour, d'une part, assurer l'étanchéité du logement 408, précédemment défini, au regard de l'extérieur du système de détection optique 500, et pour, d'autre part, permettre la rotation à grande vitesse du rotor 40 par rapport au stator 41. L'élément 430 est, par exemple, un joint tournant disposé dans une gorge dont une partie est agencée dans une surface arrière 401c de la paroi annulaire extérieure 401 du rotor 40 et dont une partie est agencée dans une surface arrière 41 le de la portion annulaire extérieure 411 du stator 41. Ainsi, grâce, d'une part, à l'étanchéité du montage de la lentille distale 30 dans le rotor 40, et, d'autre part, à l'élément 430 précité, la cavité 403 du rotor 40, dans laquelle est reçu le stator 41, est étanche vis-à-vis de l'extérieur du système de détection optique 500 selon l'invention. It should be noted that, in addition to the bearings 420, the optical detection system 500 also comprises an element 430 arranged between the rotor 40 and the stator 41, at the level of the opening of the cavity 403 formed in the volume of the rotor, configured for, on the one hand, to ensure the sealing of the housing 408, previously defined, with regard to the outside of the optical detection system 500, and, on the other hand, to allow the high speed rotation of the rotor 40 relative to to the stator 41. The element 430 is, for example, a rotary joint disposed in a groove, a part of which is arranged in a rear surface 401c of the outer annular wall 401 of the rotor 40 and of which a part is arranged in a rear surface 41 le of the outer annular portion 411 of the stator 41. Thus, thanks, on the one hand, to the sealing of the assembly of the distal lens 30 in the rotor 40, and, on the other hand, to the aforementioned element 430, the cavity 403 of the rotor 40, in which the stator 41 is received, is nche vis-à-vis the outside of the optical detection system 500 according to the invention.
Selon l'exemple, particulièrement avantageux mais non exclusif, plus particulièrement illustré notamment par la figure 1, le stator 41 est configuré pour recevoir plusieurs lentilles 31 de la caméra 100 du système de détection optique 500. Plus précisément, comme le montre la figure 1, le stator 41 est percé, selon la direction longitudinale, d'un tunnel sensiblement cylindrique 415, coaxial avec l'axe longitudinal X du système de détection optique 500, et qui s'étend According to the example, particularly advantageous but not exclusive, more particularly illustrated in particular by FIG. 1, the stator 41 is configured to receive several lenses 31 of the camera 100 of the optical detection system 500. More precisely, as shown in FIG. 1 , the stator 41 is pierced, in the longitudinal direction, with a substantially cylindrical tunnel 415, coaxial with the longitudinal axis X of the optical detection system 500, and which extends
longitudinalement d'une extrémité arrière de la queue 410 du stator 41 à une extrémité avant de la partie avant de ce dernier. En d'autres termes, le tunnel 415 débouche à chaque extrémité longitudinale du stator 41. longitudinally from a rear end of the tail 410 of the stator 41 to a front end of the front part of the latter. In other words, the tunnel 415 opens out at each longitudinal end of the stator 41.
Comme le montre la figure 1, le tunnel 415 est configuré pour loger, sensiblement As shown in Figure 1, tunnel 415 is configured to house, substantially
perpendiculairement à l'axe longitudinal X, une pluralité de lentilles 31 de la caméra 100. Plus précisément, selon l'exemple illustré par la figure 1, le tunnel 415 loge, de l'arrière vers l'avant du système de détection optique 500, une pluralité de lentilles primaires 31a sensiblement de mêmes diamètres, agencées à distance l'une de l'autre selon la direction longitudinale précédemment définie, et deux lentilles secondaires, respectivement 31b, 31c, dont les diamètres sont supérieurs aux diamètres des lentilles primaires 31a, le diamètre des lentilles secondaires allant en grandissant au fur et à mesure de leur éloignement des lentilles primaires. Les lentilles secondaires 31b, 31c, sont respectivement reçues dans des lamages agencés dans une surface avant 413a de la base 413 précédemment définie, les lentilles primaires 31a pouvant être, selon différents exemples, collées à l'intérieur du tunnel 415, ou insérées dans des gorges ou découpes agencées dans une surface extérieure 415a de celui-ci. perpendicular to the longitudinal axis X, a plurality of lenses 31 of the camera 100. More precisely, according to the example illustrated by FIG. 1, the tunnel 415 accommodates, from the rear towards the front of the optical detection system 500 , a plurality of primary lenses 31a of substantially the same diameters, arranged at a distance from each other in the longitudinal direction previously defined, and two secondary lenses, respectively 31b, 31c, the diameters of which are greater than the diameters of the primary lenses 31a, the diameter of the secondary lenses increasing as they move away from the primary lenses. The secondary lenses 31b, 31c are respectively received in countersinks arranged in a front surface 413a of the previously defined base 413, the primary lenses 31a possibly being, according to various examples, glued inside the tunnel 415, or inserted into grooves or cutouts arranged in an outer surface 415a thereof.
Selon cet exemple, le stator 41, qui sert de support aux lentilles primaires et secondaires 31, 31a, 31b, 31c, constitue donc une partie intégrante de l'objectif 2 de la caméra 100. According to this example, the stator 41, which serves as a support for the primary and secondary lenses 31, 31a, 31b, 31c, therefore constitutes an integral part of the objective 2 of the camera 100.
De la sorte, la figure 1 illustre clairement la compacité du système de détection optique 500 selon l'invention et sa facilité d'implantation dans l'encombrement réduit d'un véhicule automobile. In this way, FIG. 1 clearly illustrates the compactness of the optical detection system 500 according to the invention and its ease of installation in the small size of a motor vehicle.
De plus, selon cet exemple, et comme le montre la figure 1, le système de détection optique 500 comprend également, logé dans le logement 408 précédemment défini, un ensemble de commande 440 comprenant des composants électroniques configurés pour alimenter Moreover, according to this example, and as shown in FIG. 1, the optical detection system 500 also comprises, housed in the housing 408 previously defined, a control assembly 440 comprising electronic components configured to supply power.
électriquement et pour contrôler le fonctionnement du moteur électrique et la rotation du rotor 40 par rapport au stator 41. electrically and to control the operation of the electric motor and the rotation of the rotor 40 relative to the stator 41.
Tel qu’évoqué précédemment, le corps 1 du système de détection optique 500 est ici représenté schématiquement. Il convient de noter qu’il peut loger notamment des composants électroniques configurés notamment pour commander le fonctionnement de la caméra et l’acquisition d’images. Ces composants électroniques peuvent également comprendre des moyens de traitement des images acquises, pour déterminer un besoin de nettoyage du système optique et donc de la lentille distale, et des moyens de communication pour envoyer une instruction de mise en rotation du moteur électrique à destination des composants électroniques agencés dans le logement 408. As mentioned above, the body 1 of the optical detection system 500 is shown here schematically. It should be noted that it can house in particular electronic components configured in particular to control the operation of the camera and the acquisition of images. These electronic components can also include means for processing the acquired images, to determine a need for cleaning of the optical system and therefore of the distal lens, and communication means for sending an instruction to rotate the electric motor to the components. electronics arranged in housing 408.
En résumé, selon l'exemple de réalisation plus particulièrement illustré par la figure 1, la caméra 100 et le dispositif d'entraînement 200 partagent des composants communs qui assurent donc à la fois une fonction au sein de la caméra 100 et une fonction au sein du dispositif d'entraînement 200. Par exemple, la lentille distale 30, outre son rôle optique, joue également un rôle de fermeture et d'étanchéité vis-à-vis de l'environnement extérieur pour la cavité 403 du rotor 40 dans laquelle est reçu le stator 41. Entraînée en rotation à grande vitesse avec le rotor 40, la lentille distale 30 joue également un rôle de nettoyage de l'ensemble optique de la caméra 100. In summary, according to the exemplary embodiment more particularly illustrated by FIG. 1, the camera 100 and the training device 200 share common components which therefore provide both a function within the camera 100 and a function within the camera 100. of the drive device 200. For example, the distal lens 30, in addition to its optical role, also plays a role of closing and sealing vis-à-vis the external environment for the cavity 403 of the rotor 40 in which is received the stator 41. Driven in rotation at high speed with the rotor 40, the distal lens 30 also plays a role of cleaning the optical assembly of the camera 100.
De même, le rotor 40, outre sa fonction de rotation à grande vitesse pour obtenir l'effet centrifuge recherché pour le nettoyage de la lentille distale 30, joue un rôle de support de cette dernière. Par ailleurs, le stator 41, outre sa fonction dans le dispositif d'entraînement 200, joue un rôle de support pour une partie des lentilles 31, 31a, 31b, 31c, de la caméra 100, ainsi qu'un rôle de réception de l'ensemble de commande 440, précédemment défini, remplissant ainsi une fonction du corps 1 de la caméra 100. Likewise, the rotor 40, besides its function of high-speed rotation to achieve the centrifugal effect sought for cleaning the distal lens 30, plays a supporting role for the latter. Furthermore, the stator 41, in addition to its function in the drive device 200, plays a supporting role for part of the lenses 31, 31a, 31b, 31c, of the camera 100, as well as a role of receiving the lens. control assembly 440, previously defined, thus fulfilling a function of the body 1 of the camera 100.
L'invention permet donc la réalisation d'un système de détection optique 500 compact dont différents composants remplissent simultanément plusieurs fonctions, permettant ainsi de réduire les coûts de fabrication et d'assemblage. Par ailleurs, dans le système de détection optique 500 selon l'invention, le nettoyage de la lentille distale 30, exposée aux projection de salissures, poussières et/ou gouttes de pluie ou de neige, est réalisé par effet centrifuge grâce à la mise en rotation à grande vitesse de ladite lentille distale 30, sans nécessité d'ajout d'un fluide de nettoyage. La figure 4 illustre clairement la compacité du système de détection optique 500 selon l'invention et donc sa facilité d'implantation dans l'encombrement réduit d'un véhicule automobile. Sur cette figure 4, il est notable que l’on a retiré le rotor pour rendre visible depuis l’avant du système de détection optique la coopération entre les aimants, visibles sur la figure 4, et les bobines électromagnétiques. The invention therefore makes it possible to produce a compact optical detection system 500, of which various components simultaneously fulfill several functions, thus making it possible to reduce manufacturing and assembly costs. Furthermore, in the optical detection system 500 according to the invention, the cleaning of the distal lens 30, exposed to the projection of dirt, dust and / or drops of rain or snow, is carried out by centrifugal effect thanks to the setting in high speed rotation of said distal lens 30, without the need for addition of cleaning fluid. FIG. 4 clearly illustrates the compactness of the optical detection system 500 according to the invention and therefore its ease of installation in the small footprint of a motor vehicle. In this figure 4, it is notable that the rotor has been removed to make visible from the front of the optical detection system the cooperation between the magnets, visible in figure 4, and the electromagnetic coils.
Selon l'exemple, non exclusif, plus particulièrement illustré par les figures 2 et 3, le rotor 40 comporte 8 aimants permanents 407 angulairement régulièrement répartis à la périphérie intérieure du rotor 40, et la portion annulaire extérieure 411 du stator 41 est configurée pour recevoir 12 bobines électromagnétiques 414 angulairement régulièrement réparties à la périphérie intérieure de cette portion annulaire extérieure 411. According to the example, not exclusive, more particularly illustrated by Figures 2 and 3, the rotor 40 comprises 8 permanent magnets 407 angularly regularly distributed around the inner periphery of the rotor 40, and the outer annular portion 411 of the stator 41 is configured to receive 12 electromagnetic coils 414 angularly regularly distributed around the inner periphery of this outer annular portion 411.
La figure 5 illustre, en coupe selon un plan contenant l'axe longitudinal X précédemment défini, un exemple alternatif de réalisation d'un système de détection optique 500 selon l'invention. On retrouve notamment sur cette figure la caméra 100, son corps 1 et sa lentille distale 30, ainsi que le rotor 40, mobile en rotation autour de l'axe longitudinal X et le stator 41 fixe par rapport au rotor 40, les aimants permanents 407 du rotor 40 et les bobines électromagnétiques 414 du stator 4L Sont également représentées sur cette figure 5, les flèches Fl et F2 précédemment décrites, illustrant respectivement les directions avant et arrière, précédemment définies, du système de détection optique 500. FIG. 5 illustrates, in section along a plane containing the previously defined longitudinal axis X, an alternative embodiment of an optical detection system 500 according to the invention. In this figure, we find in particular the camera 100, its body 1 and its distal lens 30, as well as the rotor 40, movable in rotation about the longitudinal axis X and the stator 41 fixed relative to the rotor 40, the permanent magnets 407 of the rotor 40 and the electromagnetic coils 414 of the stator 4L Are also represented in this FIG. 5, the arrows Fl and F2 previously described, respectively illustrating the front and rear directions, previously defined, of the optical detection system 500.
Dans cet exemple, l’ensemble rotor/stator est décalé axialement par rapport à la caméra. Le corps 1 de la caméra 100 s'étend d'avant en arrière du système de détection optique 500, et il est notamment solidaire d’un manchon 10 coaxial avec le rotor 40 et le stator 41, traversant ces derniers de part en part, selon la direction longitudinale. In this example, the rotor / stator assembly is axially offset from the camera. The body 1 of the camera 100 extends from front to rear of the optical detection system 500, and it is in particular integral with a sleeve 10 coaxial with the rotor 40 and the stator 41, passing through the latter right through, in the longitudinal direction.
Comme le montre la figure 5, le système de détection optique 500 comprend un boîtier 5 qui s'étend, en référence aux dénominations et orientations précédemment définies, à l'avant du rotor 40 et qui est mécaniquement solidaire de ce dernier. En d'autres termes, le boîtier 5 prolonge longitudinalement, vers l'avant du système de détection optique 500, le rotor 40. Plus As shown in FIG. 5, the optical detection system 500 comprises a housing 5 which extends, with reference to the names and orientations defined above, in front of the rotor 40 and which is mechanically integral with the latter. In other words, the housing 5 extends longitudinally, towards the front of the optical detection system 500, the rotor 40. More
précisément, le boîtier 5 est une pièce de révolution dont l'axe est sensiblement, aux tolérances de fabrication et d'assemblage près, confondu avec l'axe longitudinal X précédemment défini, et qui comprend un manchon sensiblement cylindrique 50 et une partie extrémale de forme specifically, the housing 5 is a part of revolution, the axis of which is substantially, except for manufacturing and assembly tolerances, coincides with the longitudinal axis X previously defined, and which comprises a substantially cylindrical sleeve 50 and an end portion of form
sensiblement tronconique 51. substantially frustoconical 51.
Le manchon sensiblement cylindrique 50 présente un diamètre extérieur sensiblement égal à celui du rotor 40, et il est rendu solidaire en rotation, au niveau de son extrémité longitudinale arrière, de la paroi annulaire extérieure 401 du rotor 40. Selon différents exemples de réalisation, le manchon cylindrique 50 peut être mécaniquement rendu solidaire du rotor 40 par collage, par clipsage, par vissage, ou par tout autre moyen approprié, dans la mesure où cette liaison mécanique est étanche et permet l’entraînement en rotation à grande vitesse. The substantially cylindrical sleeve 50 has an outer diameter substantially equal to that of the rotor 40, and it is made integral in rotation, at its rear longitudinal end, with the outer annular wall 401 of the rotor 40. According to various embodiments, the cylindrical sleeve 50 can be mechanically made integral with the rotor 40 by gluing, clipping, screwing, or by any other suitable means, insofar as this mechanical connection is sealed and allows driving in rotation at high speed.
La partie extrémale 51 du boîtier 5, de forme sensiblement tronconique, présente un axe de révolution sensiblement confondu, aux tolérances de fabrication et d'assemblage près, avec l'axe longitudinal X précédemment évoqué, et elle s'étend, en référence aux dénominations et orientations précédemment définies, vers l'avant du système de détection optique 500, en prolongeant le manchon cylindrique 50. Selon la direction longitudinale du système de détection optique 500, le diamètre de la partie extrémale 51 diminue de l'extrémité par laquelle cette dernière est rattachée au manchon cylindrique 50 vers l'extrémité avant du système de détection optique 500. The end part 51 of the housing 5, of substantially frustoconical shape, has an axis of revolution substantially coincident, with the manufacturing and assembly tolerances close, with the longitudinal axis X previously mentioned, and it extends, with reference to the names and previously defined orientations, towards the front of the optical detection system 500, by extending the cylindrical sleeve 50. According to the longitudinal direction of the optical detection system 500, the diameter of the end part 51 decreases from the end through which the latter is attached to the cylindrical sleeve 50 towards the front end of the optical detection system 500.
Il résulte de ce qui précède que le manchon cylindrique 50 et la partie extrémale 51 délimitent ensemble une cavité 515 dans laquelle est logée une partie du corps 1 de la caméra 100 du système de détection optique 500. A titre d'exemple non exhaustif, la cavité 515 précitée peut recevoir une ou plusieurs lentilles 31, non représentées sur la figure 5, de la caméra 100. It follows from the foregoing that the cylindrical sleeve 50 and the end part 51 together define a cavity 515 in which is housed a part of the body 1 of the camera 100 of the optical detection system 500. By way of non-exhaustive example, the The aforementioned cavity 515 can receive one or more lenses 31, not shown in FIG. 5, of the camera 100.
Selon l'exemple plus particulièrement illustré par la figure 5, la partie extrémale 51 est, à son extrémité avant, de plus faible diamètre, percée d'une ouverture 510 centrée sur l'axe longitudinal X du système de détection optique 500. Plus précisément, la partie extrémale 51 forme, autour de l'ouverture 510 précitée, un tube 511 sensiblement cylindrique, d'axe X, qui s'étend, selon la direction longitudinale, vers l'arrière du système de détection optique 500, c'est-à-dire vers l'intérieur de la cavité 515 précédemment définie. According to the example more particularly illustrated by FIG. 5, the end part 51 is, at its front end, of smaller diameter, pierced with an opening 510 centered on the longitudinal axis X of the optical detection system 500. More precisely , the extremal part 51 forms, around the aforementioned opening 510, a substantially cylindrical tube 511, of axis X, which extends, in the longitudinal direction, towards the rear of the optical detection system 500, that is to say towards the interior of the previously defined cavity 515.
Le tube 511 est configuré pour recevoir la lentille distale 30 de la caméra 100. Plus précisément, la lentille distale 30 de la caméra 100 est agencée sur un support 300 sensiblement cylindrique dont le diamètre est défini légèrement inférieur à un diamètre intérieur du tube 511, de telle manière que le support 300 peut être inséré sans difficulté dans le tube 511 précité, tout en présentant un jeu radial minimal avec les parois intérieures de ce tube. Selon différents exemples, la liaison mécanique étanche de la lentille avant 30 avec la pièce intermédiaire 5 peut être réalisée par collage ou par vissage du support 300 dans le tube 511 de la pièce intermédiaire 5. Une gorge 512 peut également, comme le montre la figure 5, être agencée en périphérie de l'ouverture 510 et configurée pour recevoir un joint destiné à assurer, d'une part, la liaison mécanique entre la lentille avant 30 et la pièce intermédiaire 5 et, d'autre part, l'étanchéité de la cavité 515 précédemment décrite vis-à-vis de l'environnement extérieur au système de détection optique 500. The tube 511 is configured to receive the distal lens 30 of the camera 100. More specifically, the distal lens 30 of the camera 100 is arranged on a substantially cylindrical support 300, the diameter of which is defined to be slightly less than an internal diameter of the tube 511, in such a way that the support 300 can be inserted without difficulty into the aforementioned tube 511, while having minimal radial play with the internal walls of this tube. According to various examples, the sealed mechanical connection of the front lens 30 with the intermediate part 5 can be produced by gluing or by screwing the support 300 into the tube 511 of the intermediate part 5. A groove 512 can also, as shown in the figure 5, be arranged at the periphery of the opening 510 and configured to receive a seal intended to ensure, on the one hand, the mechanical connection between the front lens 30 and the intermediate part 5 and, on the other hand, the sealing of the cavity 515 previously described with respect to the environment outside the optical detection system 500.
Selon l'exemple plus particulièrement illustré par la figure 5, le support 300 comprend une jupe 301 sensiblement tronconique configurée pour se plaquer, lorsque le support 300 de la lentille distale 30 est reçu dans l'ouverture 510 et dans le tube 511 précités, contre l'extrémité According to the example more particularly illustrated by FIG. 5, the support 300 comprises a substantially frustoconical skirt 301 configured to press down, when the support 300 of the distal lens 30 is received in the opening 510 and in the aforementioned tube 511, against the end
longitudinale avant de la partie extrémale 51, afin, d'une part, de compléter l'étanchéité de la cavité 515 précédemment décrite vis-à-vis de l'environnement extérieur au système de détection optique 500, et, d'autre part, de protéger le joint, précédemment évoqué, disposé dans la gorge 512 précédemment décrite, destiné à assurer la liaison mécanique étanche de la lentille distale 30 avec le boîtier 5. longitudinal front of the end part 51, in order, on the one hand, to complete the sealing of the cavity 515 previously described with respect to the environment outside the optical detection system 500, and, on the other hand, to protect the seal, previously mentioned, placed in the previously described groove 512, intended to ensure the sealed mechanical connection of the distal lens 30 with the housing 5.
L’entraînement à grande vitesse du rotor 40 génère la rotation à grande vitesse du boîtier et de la lentille distale 30 rendu solidaire de ce boîtier 5. The high-speed drive of the rotor 40 generates the high-speed rotation of the housing and the distal lens 30 secured to this housing 5.
Dans la configuration illustrée par la figure 5, le système de détection optique 500 est moins compact que selon les exemples de réalisation illustrés par les figures 1 à 4. L'exemple de réalisation illustré par la figure 5 peut autoriser toutefois l'utilisation de caméras du commerce dont seule la lentille distale 30 est déplacée pour être disposée à l'extrémité avant de la pièce intermédiaire 5 précédemment décrite. Une telle configuration peut donc présenter un compromis en termes de coûts de fabrication, dans lequel les avantages de l'invention en termes de nettoyage de la lentille distale 30 et de qualité des images obtenues sont conservés. L'invention, telle qu'elle vient d'être décrite, atteint bien les buts qu'elle s'était fixés et permet, par des moyens simples, de réaliser un système de détection optique 500 compact, dont le nettoyage d'une lentille distale 30 d'une caméra 100 qu'il comporte est réalisé par effet centrifuge, un tel système de détection optique garantissant en outre, par l'absence de surface interposée entre la lentille distale 30 précitée et l'environnement extérieur au système de détection optique 500, la reproductibilité et la fiabilité des images obtenues par la caméra 100. In the configuration illustrated by FIG. 5, the optical detection system 500 is less compact than according to the exemplary embodiments illustrated by FIGS. 1 to 4. The exemplary embodiment illustrated by FIG. 5 may however allow the use of cameras. trade in which only the distal lens 30 is moved to be placed at the front end of the intermediate piece 5 previously described. Such a configuration can therefore present a compromise in terms of manufacturing costs, in which the advantages of the invention in terms of cleaning of the distal lens 30 and of the quality of the images obtained are retained. The invention, as it has just been described, achieves the goals it had set itself and allows, by simple means, to achieve a compact optical detection system 500, including cleaning a lens distal 30 of a camera 100 that it comprises is produced by centrifugal effect, such an optical detection system further guaranteeing, by the absence of a surface interposed between the aforementioned distal lens 30 and the environment outside the optical detection system 500, the reproducibility and reliability of the images obtained by the camera 100.
L'invention ne saurait toutefois se limiter aux moyens et configurations décrits et illustrés, et elle s'applique également à tous moyens ou configurations équivalents et à toute combinaison de tels moyens. En particulier, si le système de détection optique décrit et illustré ici présente, ainsi que ses composants, une symétrie de révolution, l'invention s'applique à toute forme de système de détection optique, dans la mesure où il présente, ainsi que ses composants, les caractéristiques fonctionnelles décrites dans le présent document. The invention cannot however be limited to the means and configurations described and illustrated, and it also applies to all equivalent means or configurations and to any combination of such means. In particular, if the optical detection system described and illustrated here has, as well as its components, a symmetry of revolution, the invention applies to any form of optical detection system, insofar as it has, as well as its components, the functional characteristics described in this document.

Claims

REVENDICATIONS
1. Système de détection optique (500) pour un véhicule automobile, caractérisé en ce qu'il comprend une caméra (100) dont une lentille distale (30) est agencée à distance d'un corps (1) logeant des composants électroniques du système de détection optique (500), la lentille distale (30) étant montée rotative pour être entraînée en rotation à grande vitesse par un dispositif d'entraînement (200). 1. Optical detection system (500) for a motor vehicle, characterized in that it comprises a camera (100) of which a distal lens (30) is arranged at a distance from a body (1) housing the electronic components of the system. optical detection sensor (500), the distal lens (30) being rotatably mounted to be rotated at high speed by a drive device (200).
2, Système de détection optique (500) selon la revendication précédente, caractérisé en ce que l'axe de rotation de la lentille distale (30) de la caméra (100) est sensiblement confondu avec un axe optique (X) de la caméra (100). 2, optical detection system (500) according to the preceding claim, characterized in that the axis of rotation of the distal lens (30) of the camera (100) is substantially coincident with an optical axis (X) of the camera ( 100).
3. Système de détection optique (500) selon l'une ou l'autre des revendications précédentes, caractérisé en ce que le dispositif d'entraînement (200) comprend un moteur qui comporte un stator (41) fixe et solidaire du corps (1) de la caméra (100), et un rotor (40) mobile en rotation par rapport au stator (41), l'axe de rotation du rotor (40) étant sensiblement confondu avec l'axe de rotation (X) de la lentille distale (30) et le rotor (40) étant rendu mécaniquement solidaire de la lentille distale (30). 3. Optical detection system (500) according to either of the preceding claims, characterized in that the drive device (200) comprises a motor which comprises a stator (41) fixed and integral with the body (1). ) of the camera (100), and a rotor (40) movable in rotation with respect to the stator (41), the axis of rotation of the rotor (40) being substantially coincident with the axis of rotation (X) of the lens distal (30) and the rotor (40) being made mechanically integral with the distal lens (30).
4, Système de détection optique (500) selon la revendication précédente, caractérisé en ce que le rotor (40) et le stator (41) comprennent respectivement des organes électromagnétiques dont au moins une bobine dont l’alimentation est pilotée pour entraîner à grande vitesse le rotor (40), lesdits organes électromagnétiques s’étendant autour de la lentille distale (30). 4, optical detection system (500) according to the preceding claim, characterized in that the rotor (40) and the stator (41) respectively comprise electromagnetic members including at least one coil whose power supply is controlled to drive at high speed the rotor (40), said electromagnetic members extending around the distal lens (30).
5, Système de détection optique (500) selon l'une quelconque des revendications 3 ou 4, caractérisé en ce que le rotor (40) comporte une paroi d’extrémité (400) au centre de laquelle la lentille distale (30) est fixée, et une pluralité de parois annulaires (401, 402) définissant une cavité (403) de réception au moins partielle du stator (41). 5, optical detection system (500) according to any one of claims 3 or 4, characterized in that the rotor (40) has an end wall (400) in the center of which the distal lens (30) is fixed. , and a plurality of annular walls (401, 402) defining a cavity (403) for at least partial reception of the stator (41).
6. Système de détection optique (500) selon la revendication 3, caractérisé en ce que le rotor (40) et le stator (41) comprennent respectivement des organes électromagnétiques dont au moins une bobine dont l’alimentation est pilotée pour entraîner à grande vitesse le rotor (40), lesdits organes électromagnétiques s’étendant axialement à distance de la lentille distale (30) et le rotor (40) étant prolongé, vers l'avant du système de détection optique (500), par un boîtier (5) solidaire en rotation du rotor (40) et configuré pour loger le corps (1) de la caméra (100) et pour supporter la lentille distale (30). 6. Optical detection system (500) according to claim 3, characterized in that the rotor (40) and the stator (41) respectively comprise electromagnetic members including at least one coil whose power supply is controlled to drive at high speed. the rotor (40), said electromagnetic members extending axially away from the distal lens (30) and the rotor (40) being extended, towards the front of the optical detection system (500), by a housing (5) integral in rotation with the rotor (40) and configured to house the body (1) of the camera (100) and to supporting the distal lens (30).
7. Système de détection optique (500) selon l'une quelconque des revendications précédentes et comprenant une pluralité de lentilles (3, 30, 31, 31a, 31b, 31c), caractérisé en ce que le stator (41) comprend un tunnel (415) d'accueil configuré pour recevoir au moins une lentille (3, 31, 31a, 31b, 31c) de la caméra (100) distincte de la lentille distale (30). 7. Optical detection system (500) according to any one of the preceding claims and comprising a plurality of lenses (3, 30, 31, 31a, 31b, 31c), characterized in that the stator (41) comprises a tunnel ( 415) host configured to receive at least one lens (3, 31, 31a, 31b, 31c) of the camera (100) separate from the distal lens (30).
8. Système de détection optique (500) selon l'une quelconque des revendications 8. An optical detection system (500) according to any one of claims
précédentes, caractérisé en ce que le stator (41) est configuré pour recevoir un ensemble de commande (440) du système de détection optique (500). above, characterized in that the stator (41) is configured to receive a control assembly (440) of the optical detection system (500).
9. Véhicule automobile équipé d'au moins un système de détection optique (500) selon l'une quelconque des revendications précédentes. 9. Motor vehicle equipped with at least one optical detection system (500) according to any one of the preceding claims.
10. Véhicule automobile selon la revendication précédente, comportant une pluralité de systèmes de détection optique, dans lequel l'au moins un système de détection optique (500) selon l'une quelconque des revendications 1 à 8 est agencé à l'arrière du véhicule. 10. Motor vehicle according to the preceding claim, comprising a plurality of optical detection systems, wherein the at least one optical detection system (500) according to any one of claims 1 to 8 is arranged at the rear of the vehicle. .
PCT/EP2020/070492 2019-07-31 2020-07-20 Optical detection system for a motor vehicle WO2021018658A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FRFR1908791 2019-07-31
FR1908791A FR3099443B1 (en) 2019-07-31 2019-07-31 OPTICAL DETECTION SYSTEM FOR MOTOR VEHICLE

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018019662A1 (en) 2016-07-28 2018-02-01 Valeo Systèmes d'Essuyage Device for protecting an optical sensor and driving aid system comprising an optical sensor
WO2018091641A1 (en) * 2016-11-17 2018-05-24 Valeo Systèmes d'Essuyage Device for protecting an optical sensor, and associated driver assistance system and cleaning method
FR3062764A1 (en) * 2017-02-08 2018-08-10 Valeo Systemes D'essuyage VISION DEVICE, DRIVING ASSISTANCE SYSTEM AND METHOD OF MAINTAINING VISIBILITY THEREFOR

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018019662A1 (en) 2016-07-28 2018-02-01 Valeo Systèmes d'Essuyage Device for protecting an optical sensor and driving aid system comprising an optical sensor
WO2018091641A1 (en) * 2016-11-17 2018-05-24 Valeo Systèmes d'Essuyage Device for protecting an optical sensor, and associated driver assistance system and cleaning method
FR3062764A1 (en) * 2017-02-08 2018-08-10 Valeo Systemes D'essuyage VISION DEVICE, DRIVING ASSISTANCE SYSTEM AND METHOD OF MAINTAINING VISIBILITY THEREFOR

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FR3099443A1 (en) 2021-02-05

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