Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/80—Camera processing pipelines; Components thereof
  • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
  • H04N23/811—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation by dust removal, e.g. from surfaces of the image sensor or processing of the image signal output by the electronic image sensor
• • 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
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
  • B60R11/04—Mounting of cameras operative during drive; Arrangement of controls thereof relative to the vehicle
• • 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
  • B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
  • B60S1/48—Liquid supply therefor
  • B60S1/52—Arrangement of nozzles; Liquid spreading means
• • 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
  • B60S1/54—Cleaning windscreens, windows or optical devices using gas, e.g. hot air
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B17/00—Details of cameras or camera bodies; Accessories therefor
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B17/00—Details of cameras or camera bodies; Accessories therefor
  • G03B17/02—Bodies
  • G03B17/08—Waterproof bodies or housings
• • 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
  • H04N23/51—Housings
• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
  • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B17/00—Details of cameras or camera bodies; Accessories therefor
  • G03B17/56—Accessories

Definitions

• the present invention relates to an optical detection system for a motor vehicle.
• An optical detection system is any system comprising optical sensors, such as cameras, laser sensors (commonly called LIDARS) or other sensors based on the emission and / or detection of light in the visible or invisible spectrum for humans , especially the infrared.
• optical sensors such as cameras, laser sensors (commonly called LIDARS) or other sensors based on the emission and / or detection of light in the visible or invisible spectrum for humans , especially the infrared.
• Cameras are known which are installed inside the cockpit against the rear window / bezel looking towards the rear from the rear window of the vehicle. These cameras are well protected from external climatic influences and can for example benefit from the defrosting and cleaning systems of the rear window, for example a heating wire integrated in the glass of the rear window.
• the angle of view is not optimal, especially for a parking aid and for this reason, it is preferred that the camera is arranged at the rear bumper or at the rear registration plate of the vehicle. .
• the camera is highly exposed to the projections of dirt that can be deposited on its optics and thus reduce its effectiveness, or even make it inoperative.
• a device for cleaning the optics of the camera usually a nozzle of cleaning fluid, close to it, to remove the polluting elements that are deposited over time.
• frost may settle on the optics of the camera, making it inoperative.
• a known state of the art is for example represented by the document FR2841488 in the name of the Applicant in which a nozzle projects for example a washing liquid under pressure on a protective glass of the camera.
• the jet is also assisted by means of vibration to remove stubborn dirt from the protective glass of the camera, glass that can be heated to protect against the deposition of frost in cold weather.
• this vision system can be optimized. Indeed, after the projection of a washing liquid on the optics of the camera, there may remain drops attached to the protective glass, which damages and deforms the image taken by the camera. The presence of the washing liquid drops results from the fact that the washing liquid does not slip easily on the surface of the optics of the camera. In addition, the evaporation of the drops on the protective glass leaves traces that can be seen on the image taken by the camera.
• the present invention proposes to remedy at least partially one or more of the aforementioned disadvantages by presenting an alternative optical detection system for preventing the deposit of dirt on the camera.
• the subject of the invention is an optical detection system of a motor vehicle comprising:
• a gate disposed on the optical axis of the optical sensor in the field of view thereof and perpendicular to this optical axis, and on the other hand a generator of a flow of air towards the grid.
• micro-turbulence is created downstream of the grid which prevents water, dust or more generally dirt from crossing the gate in the direction of the camera and being deposited on the screen. camera lens.
• the grid has meshes of parallelepipedal shape, in particular of square shape.
• the length of a side of a mesh is for example between 0.5mm and 2.5mm, in particular equal to 2mm.
• the grid is formed of wires having a diameter less than
• 0.05mm in particular between 0.02mm and 0.04mm.
• the grid may be formed of stainless steel wire or plastic material, in particular composite material.
• the grid comprises resistive son able to heat up by Joule effect and is configured to be connected to a power source for heating the grid.
• the protective housing has a cylindrical shape and the grid has a disk shape closing one end of the ends of the protective housing.
• the protective housing has a cylindrical shape and the gate has a shape adapted to cover the viewing angles of the optical sensor.
• the air flow surrounds the optical sensor.
• the airflow generator is integrated in the protective housing.
• the airflow generator comprises for example an air blower disposed behind the protective housing.
• the airflow generator comprises a compressor located outside the protective housing.
• the optical detection system may further comprise at least one nozzle for spraying a washing liquid on the face of the grid facing the optical sensor.
• the optical detection system comprises a plurality of spray nozzles of a washing liquid evenly distributed around the optical sensor and projecting inside the protective case.
• FIG. 1 shows in a longitudinal sectional view a simplified diagram of an embodiment of an optical detection system. presenting in detail a grid in front view.
• the following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined or interchanged to provide other embodiments.
• a first element is disposed upstream of a second element if the fluid first passes through the first element and then through the second element.
• FIG. 1 shows an embodiment of an optical detection system 1 according to the invention for a motor vehicle.
• the optical detection system 1 is for example intended to be mounted at the rear of a motor vehicle, for example at a bumper or a license plate (not shown). It can also for example be mounted on the sides of the vehicle, for example to replace side mirrors.
• the optical detection system 1 comprises a protective case 3 and an optical sensor 5, in particular a picture-taking device such as a camera, mounted in the protective case 3.
• the protective housing 3 is for example of cylindrical shape and comprises at one end 6 a gate 8. In the same figure, the gate 8 is also shown from the front.
• the optical sensor 5 comprises for example enclosed in a housing 9 a CCD sensor (for "coupled coupled device” or a charge coupled device) or a CMOS measurement sensor composed of a matrix of miniature photodiodes.
• This measuring sensor is connected for example to a processing unit including a microprocessor for processing the data / images taken.
• the optical sensor 5 further comprises an optical 1 1 for example a convex lens (curved) such as a fish eye optics ("fish-eye” in English) sealingly attached to the housing 9 in front of the measuring sensor.
• an optical 1 1 for example a convex lens (curved) such as a fish eye optics ("fish-eye” in English) sealingly attached to the housing 9 in front of the measuring sensor.
• the gate 8 is arranged on the optical axis A of the optical sensor 5 in the field of view thereof and perpendicularly to this optical axis A,
• the grid 8 has, for example, meshes 13 of parallelepipedal shape, in particular of square shape.
• the length of one side of a mesh 13 may be between 0.5 mm and 2.5 mm, in particular equal to 2 mm.
• the grid 8 is formed in particular of son 15 having a diameter less than 0.05 mm, in particular between 0.02 mm and 0.04 mm.
• this grid 8 does not appear on the images taken.
• the grid 8 is for example formed of son 15 of a material that can be exposed to the weather without deterioration, in particular stainless steel or plastic material, in particular composite material, for example a fiber-filled plastic.
• the grid 8 comprises resistive wires able to heat up by the Joule effect and the gate 8 is configured to be connected to a power source for heating the gate 8.
• the gate 8 is configured to be connected to a power source for heating the gate 8.
• the gate 8 has a disk shape.
• this form of the grid may be different from the moment when the grid 8 has a shape capable of covering the viewing angles of the optical sensor 5.
• the optical detection system 1 comprises a generator 19 of an air flow towards the gate 8.
• the generator 19 of an air flow is for example integrated in the protective housing 3 and comprises an air blower 21 disposed at the rear of the protective housing 3. Due to the position of the generator 19, the air flow indicated by arrows 23 surrounds the optical sensor 5.
• the air flow generator comprises a compressor located outside the protective housing 5 to deliver a flow of compressed air towards the gate 8.
• the optical detection system 1 further comprises at least one jet nozzle 27 of a washing liquid on the face of the gate 8 facing the optical sensor 5.
• the system can comprise several jet nozzles 27 of a washing liquid regularly distributed around the optical sensor 5 and projecting inside the protective casing 3.
• projection nozzles 27 are for example connected to a reservoir of a washing liquid (not shown) with a pump. It can for example be the tank and the pump of a wiper system.
• the generator 19 of the air stream for example in the form of a blower 21 with rotating blades, drives a flow of air from the rear of the protective box towards the gate 8.
• This air flow surrounds the optical sensor 5 and allows, if necessary, to clean the grid 8 of dirt that has deposited on the grid 8.
• This cleaning action can be supported by projections of a washing liquid by the intermediate projection nozzles 27.
• the optical sensor 5 which is always clear and clean. Thanks to the air flows, the consumption of a washing fluid is limited and there are no problems of traces left by the washing liquid.
• the optical sensor 5 is also protected independently of the speed of movement of the vehicle.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• General Physics & Mathematics (AREA)
• Physics & Mathematics (AREA)
• Water Supply & Treatment (AREA)
• Studio Devices (AREA)
• Geophysics And Detection Of Objects (AREA)
• Length Measuring Devices By Optical Means (AREA)
• Investigating Or Analysing Materials By Optical Means (AREA)
• Optical Measuring Cells (AREA)
• Lens Barrels (AREA)
• Camera Bodies And Camera Details Or Accessories (AREA)
• Cameras Adapted For Combination With Other Photographic Or Optical Apparatuses (AREA)
• Accessories Of Cameras (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=56087337

Family Applications (1)

Country Status (10)

Families Citing this family (9)

Family Cites Families (36)

• 2016
  • 2016-03-10 FR FR1652015A patent/FR3048659B1/fr not_active Expired - Fee Related
• 2017
  • 2017-03-08 KR KR1020187029110A patent/KR20190008190A/ko unknown
  • 2017-03-08 MX MX2018010922A patent/MX2018010922A/es unknown
  • 2017-03-08 US US16/082,728 patent/US20190071058A1/en not_active Abandoned
  • 2017-03-08 WO PCT/EP2017/055452 patent/WO2017153476A1/fr active Application Filing
  • 2017-03-08 JP JP2018547432A patent/JP2019516121A/ja active Pending
  • 2017-03-08 CN CN201780014949.9A patent/CN108780264A/zh active Pending
  • 2017-03-08 RU RU2018135381A patent/RU2018135381A/ru not_active Application Discontinuation
  • 2017-03-08 EP EP17708556.0A patent/EP3427109A1/de not_active Withdrawn
  • 2017-03-08 BR BR112018016316-3A patent/BR112018016316A2/pt not_active Application Discontinuation

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