WO2003104052A1 - Device for preventing particles/substances from depositing on a sensitive optical unit, particularly on a sensor surface - Google Patents

Device for preventing particles/substances from depositing on a sensitive optical unit, particularly on a sensor surface Download PDF

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Publication number
WO2003104052A1
WO2003104052A1 PCT/DE2003/000930 DE0300930W WO03104052A1 WO 2003104052 A1 WO2003104052 A1 WO 2003104052A1 DE 0300930 W DE0300930 W DE 0300930W WO 03104052 A1 WO03104052 A1 WO 03104052A1
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WO
WIPO (PCT)
Prior art keywords
sensor surface
annular gap
flow
protected
feed channel
Prior art date
Application number
PCT/DE2003/000930
Other languages
German (de)
French (fr)
Inventor
Hans-Dieter Bothe
Hoang Trinh
Heiko Freienstein
Thomas Engelberg
Original Assignee
Robert Bosch Gmbh
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.)
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Publication date
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Publication of WO2003104052A1 publication Critical patent/WO2003104052A1/en

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Classifications

    • 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
    • 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
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
    • B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
    • B60S1/0833—Optical rain sensor
    • B60S1/0844—Optical rain sensor including a camera
    • B60S1/0848—Cleaning devices for cameras on 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
    • B60S1/54—Cleaning windscreens, windows or optical devices using gas, e.g. hot air
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G01N2021/151—Gas blown

Definitions

  • the invention relates to a device for avoiding deposits of particles / substances on a sensitive optical device, in particular a sensor surface, with the features mentioned in the preamble of claim 1.
  • suitable housings or housing casings prevent dirt from being deposited on the sensor surface.
  • the disadvantage here is that the housing or For example, the housing shell mostly affects the function of the sensor. Furthermore, the device usually has to be removed with great difficulty for cleaning or replacement.
  • the prior art also includes a device known from patent literature EP 0 436 701 B1, in which a rotating disk / lens is used in front of the actual optics. Moisture and dirt deposits are continuously removed from the lens due to the centrifugal force generated.
  • this device has the disadvantage that the dirt-sensitive sensor surfaces also have to be cleaned and serviced at short intervals under unfavorable ambient conditions.
  • DE 197 16 757 A1 also describes a further device for contactless, locally limited heating of material with the aid of focused radiation, in particular light, for focusing it concave reflector and an optical system are provided, known, in which means are provided for guiding a gas flow, which is used to cool components of the light source, and which guide the gas flow heated by the light source in such a way that it releases particles or vapors from the device during operation the optics or away from a protective glass.
  • the means required to guide the gas flow away from the optics or from a protective glass include an air supply, a guide ring and a nozzle screen.
  • a disadvantage of this known solution is that both a guide ring and a nozzle orifice are required to guide the air flow, at least the nozzle orifice having a disruptive effect, for example in the area of video-based motor vehicle interior sensors, in front of the sensors. Furthermore, the nozzle covers build on the sensor surface and form sharp edges, in particular when used in a motor vehicle interior, which are also easily destroyed if the occupants of the motor vehicle are careless.
  • the device according to the invention with the features mentioned in claim 1 offers the advantage that deposits of particles / substances on sensitive optical devices can be avoided in a simple manner with a simple, robust, maintenance-free and inexpensive construction.
  • the agent is designed as a supply channel and / or as a suction channel.
  • the advantage is created that directly above a predeterminable area of the optical device, the gaseous medium supplied to the sensor surface, then passed and / or removed from it, generates a protective cross flow.
  • the advantage is created according to claim 5 that a circulating air circuit can be produced by connecting the supply duct to the suction duct via a connecting line. A blower, a filter and a secondary outlet integrated in the connecting line create a cost-effective, energy-saving and pulsation-free circulation circuit.
  • the means according to claim 7 can be formed as an annular gap or as a tangential annular gap.
  • the annular gap forms, together with the supply channel, a central blowout (sink flow) in the area to be protected and, in the case of a combination with the suction channel, a central suction (source flow).
  • the tangential annular gap is arranged in a spiral housing, as a result of which a vortex blowout (vertebral sink flow) can be formed in the area to be protected.
  • Both single-phase and multi-phase mixtures can be used as the gaseous medium, which can alternatively be adjusted with respect to their temperature and / or humidity depending on the given boundary conditions.
  • the protection is generated effecting flows, according to the independent claims 4, 8, 9 and 10, can be combined with mechanical protection elements. If the flow generated by the supply and / or discharge of the gaseous medium is interrupted or if objects such as parts of the body in a passenger compartment occupied by a vehicle approach, a protective cover folds, swivels or rotates in front of the sensor surface, depending on the design. This folding, swiveling or turning of the protective cover takes place automatically.
  • Various methods are known for the automatic detection of larger objects in the area of the sensor surface, for example light barriers, video sensors, but also by evaluating camera images using methods known from suitable algorithms.
  • the mechanical protective element - the protective cover - can be made in one piece or in several parts.
  • the protective cover can consist of two halves that fold over the sensor surface.
  • Other possible designs, such as an iris diaphragm, a slit diaphragm, a link-shaped flap or a swivel cover, can also be implemented.
  • the protective cover can additionally be equipped with a scraper, which cleans the sensor surface when it is opened and closed, and any residues, such as fat residues from fingerprints and the like, which are caused by the one Flow-generating, gaseous medium can not be prevented, eliminated.
  • a scraper which cleans the sensor surface when it is opened and closed, and any residues, such as fat residues from fingerprints and the like, which are caused by the one Flow-generating, gaseous medium can not be prevented, eliminated.
  • FIG. 1 shows a sectional illustration of an optical device with a feed channel generating a cross flow
  • FIG. 2 shows a view A of a sensor surface of the optical device with the feed channel generating the cross flow
  • FIG. 3 shows the optical device with the feed channel and a suction channel of the generated cross flow and a connecting line
  • FIG. 4 shows the optical device with an annular gap which generates a source flow via the suction channel
  • FIG. 5 shows a section AA of the annular gap with the generated source flow
  • FIG. 6 shows the optical device with a sink flow generated by the annular gap via the feed channel
  • Figure 7 is a section A-A of the annular gap and the sink flow generated
  • Figure 8 shows the optical device with a vortex sink flow generated by a tangential annular gap over the feed channel
  • Figure 9 shows a section A-A of the tangential annular gap with the vortex sink flow generated.
  • FIG. 1 shows a sectional illustration of an optical device 100 with a feed channel 18 that generates a cross flow 24.
  • the feed channel 18 is a means 12 which has the property of specifying the direction of the flow — here the cross flow 24.
  • a sensor surface 10 of the optical device 100 is not restricted, that is to say the target field to be sensed is not impaired by the feed channel 18.
  • the feed channel 18 ends in an edge region of the optical device 100.
  • a gaseous medium 14 is introduced into the feed channel 18 on an access side 26, by means of which the gaseous cross flow 24 is generated.
  • FIG. 1 and FIG. 2 show that the cross-flow 24 flows over the entire surface area 22 that can be predetermined.
  • FIG. 2 shows a view A of the sensor surface 10 of the optical device 100 with the feed channel 18 which generates the cross flow 24.
  • the feed channel 18 arranged at the edge of the optical device 100 illustrates the uncovered sensor surface 10.
  • the area 22 which is separated from the gaseous medium 14 to be protected or painted over can be predetermined by designing the feed channel 18. By halving it can be achieved, for example, that only a partial area of the sensor surface is covered by the gaseous medium 14 and protected by a transverse flow 24.
  • FIG. 3 shows the optical device 100 with the feed channel 18 and a suction channel 20, which are arranged to generate the cross flow 24.
  • an outlet side 28 of the suction channel is connected to the access side 26 of the feed channel 18 via a connecting line 30.
  • the gaseous medium 14 advantageously forms the cross flow 24 in front of the sensor surface 10 via the predeterminable region 22.
  • the connecting line 30 there are suitable arrangements for filtration -a filter 34-, for generating the volume flow -a fan 32-, for conditioning the gaseous medium 14 -a processing device 50- and a venting device -a secondary outlet 48- to avoid pulsations integrated.
  • the processing device 50 is able to condition desired parameters of the gaseous medium 14, such as temperature, humidity and the like, in a type of air conditioning system, whereby positive effects, such as, for example, fogging of the sensor surface 10, are achieved.
  • FIG. 4 shows the optical device 100 with an annular gap 36 that generates a source flow 40 via the suction channel 20.
  • the gaseous medium 14 is sucked in here via the suction channel 20 via the outlet side 28 and generates a central suction (source flow 40) on the sensor surface 10
  • the arrangement of the annular gap 36 is arranged such that the sensor surface 10 is not covered.
  • FIG. 5 shows in connection with FIG. 4 a section A-A of the annular gap 36 with the generated source flow 40, which merges into the suction channel 20.
  • a sufficiently strong formation of the central suction flow (source flow 40) achieves complete protection of the sensor surface 10.
  • FIG. 6 shows the reverse case of FIG. 5 with regard to the direction of flow, the optical device 100 with a central blowout (sink flow 38) generated by the annular gap 36 via the feed channel 18.
  • the gaseous medium 14 is fed to the feed channel 18 via the access side 26 and forms a central blowout (sink flow 38) on the sensor surface.
  • FIG. 7 shows an associated section AA of the annular gap 36 and the central blowout (sink flow 38) generated. Further reference numerals shown mean the same parts as in the previous figures.
  • FIG. 8 shows the optical device 100 with a central blowout (vortex sink flow 48) generated by a tangential annular gap 42 via the feed channel 18.
  • the gaseous medium 14 is supplied as already described in FIG. 6.
  • the difference is in the formation of the tangential annular gap 42 with a spiral housing 44.
  • the central blow-out (vortex sink flow) is generated by the spiral housing 44 and the tangential annular gap 42 thus created.
  • FIG. 9 shows an associated section A-A of the tangential annular gap 42 with a central blowout (vortex sink flow 46).
  • the same reference numerals mean the same parts.
  • the described device for avoiding deposits of particles / substances on a sensor surface 10 of an optical device 100 and the devices 18, 20, 36, 42, 44 of the generated currents 24, 38, 40, 46 are provided with mechanical protective elements 16 combinable.
  • the mechanical protective elements 16 have not been shown in the figures.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automation & Control Theory (AREA)
  • Studio Devices (AREA)

Abstract

The invention relates to a device for preventing particles/substances from depositing on a sensor surface of an optical unit. To this end, at least one means (12) is provided, which is assigned to the optical unit (100), does not restrict the sensor surface (10), and which directionally protects a predeterminable area (22) of the sensor surface by using a gaseous medium (14) that can be fed thereto and/or withdrawn therefrom.

Description

Vorrichtung zur Vermeidung von Ablagerungen von Partikeln/Substanzen auf einem empfindlichen optischen Gerät, insbesondere einer Sensor-OberflächeDevice for avoiding deposits of particles / substances on a sensitive optical device, in particular a sensor surface
Die Erfindung betrifft eine Vorrichtung zur Vermeidung von Ablagerungen von Partikeln/Substanzen auf einem empfindlichen optischen Gerät, insbesondere einer Sensor-Oberfläche, mit den im Oberbegriff des Anspruchs 1 genannten Merkmalen.The invention relates to a device for avoiding deposits of particles / substances on a sensitive optical device, in particular a sensor surface, with the features mentioned in the preamble of claim 1.
Stand der TechnikState of the art
Es ist bekannt, optische Geräte, insbesondere Sensor- Oberflächen, so zu installieren, dass sie Verschmutzungen und Ablagerungen nur minimal ausgesetzt sind.It is known to install optical devices, in particular sensor surfaces, in such a way that they are only minimally exposed to dirt and deposits.
Bei Einbauarten mit ungünstigen Umgebungsbedingungen sind im Wesentlichen drei Verfahren beziehungsweise Vorrichtungen bekannt, die eine direkte Verschmutzung der Sensoren verhindern.For types of installation with unfavorable environmental conditions, essentially three methods or devices are known which prevent direct contamination of the sensors.
In einer bekannten Vorrichtung wird mittels geeigne- ter Gehäuse beziehungsweise Gehäusehüllen verhindert, dass sich Schmutz auf der Sensor-Oberfläche ablagern kann. Nachteilig dabei ist, dass das Gehäuse bezie- hungsweise die Gehäusehülle die Funktion des Sensors zumeist beeinträchtigt. Des Weiteren muss die Vorrichtung zum Zwecke der Reinigung oder des Austausches zumeist umständlich ausgebaut werden. Unter die Kategorie der Gehäusehüllen fallen zum Beispiel transparente Kunststoff üllen für Videosensoren.In a known device, suitable housings or housing casings prevent dirt from being deposited on the sensor surface. The disadvantage here is that the housing or For example, the housing shell mostly affects the function of the sensor. Furthermore, the device usually has to be removed with great difficulty for cleaning or replacement. Transparent plastic sleeves for video sensors, for example, fall under the category of housing sleeves.
Nachteilig bei dieser vorbekannten Lösung ist zudem, dass der Schutz von Sensor-Oberflächen vor Verschmut- zungen und Ablagerungen, zum Beispiel einer Kameraoptik von videobasierten Sensorsystemen in Kraftfahrzeug-Innenräumen, von in der Luft schwebenden Schmutzpartikeln (zum Beispiel Staub) und von Rauch (zum Beispiel von Zigarettenrauch) mittels dieser Vorrichtung nicht verhindert werden kann..Another disadvantage of this previously known solution is that the protection of sensor surfaces from dirt and deposits, for example camera optics of video-based sensor systems in motor vehicle interiors, of dirt particles floating in the air (for example dust) and of smoke (for Example of cigarette smoke) cannot be prevented by this device.
Zum Stand der Technik gehört ferner eine aus der Patentliteratur EP 0 436 701 Bl bekannte Vorrichtung, bei der eine rotierende Scheibe/Linse vor der eigent- liehen Optik eingesetzt wird. Feuchtigkeits- und Schmutzablagerungen werden aufgrund der entstehenden Fliehkraft an der Linse von dieser kontinuierlich abtransportiert. Bei dieser Vorrichtung ist jedoch nachteilig, dass die schmutzempfindlichen Sensor- Oberflächen unter ungünstigen Umgebungsbedingungen ebenfalls in kurzen Abständen gereinigt und gewartet werden müssen.The prior art also includes a device known from patent literature EP 0 436 701 B1, in which a rotating disk / lens is used in front of the actual optics. Moisture and dirt deposits are continuously removed from the lens due to the centrifugal force generated. However, this device has the disadvantage that the dirt-sensitive sensor surfaces also have to be cleaned and serviced at short intervals under unfavorable ambient conditions.
Aus der DE 197 16 757 AI ist ferner eine weitere Vor- richtung zur berührungslosen, örtlich begrenzten Erwärmung von Material mit Hilfe von gebündelter Strahlung, insbesondere Licht, zu dessen Bündelung ein konkaver Reflektor und eine Optik vorgesehen sind, bekannt, bei der Mittel zur Führung eines Gasstromes vorgesehen sind, der zur Kühlung von Bestandteilen der Lichtquelle dient, und die den von der Licht- quelle erwärmten Gasstrom so führen, dass er im Betrieb Partikel oder Dämpfe von der Optik oder von einem Schutzglas wegführt. Zu den benötigten Mitteln, um den Gasstrom von der Optik oder von einem Schutzglas wegzuführen, gehört eine Luftzufuhr, ein Leit- ring und eine Düsenblende.DE 197 16 757 A1 also describes a further device for contactless, locally limited heating of material with the aid of focused radiation, in particular light, for focusing it concave reflector and an optical system are provided, known, in which means are provided for guiding a gas flow, which is used to cool components of the light source, and which guide the gas flow heated by the light source in such a way that it releases particles or vapors from the device during operation the optics or away from a protective glass. The means required to guide the gas flow away from the optics or from a protective glass include an air supply, a guide ring and a nozzle screen.
Nachteilig bei dieser vorbekannten Lösung ist, dass zur Führung des Luftstromes sowohl ein Leitring als auch eine Düsenblende benötigt werden, wobei min- destens die Düsenblende beispielsweise im Bereich von videobasierten Kraftfahrzeug-Innenraumsensierungen vor der Sensorik störend wirkt. Des Weiteren bauen die Düsenblenden auf der Sensor-Oberfläche auf und bilden insbesondere bei einer Verwendung in einem Kraf fahrzeug-Innenraum scharfe Kanten, die zudem bei Unachtsamkeit der Insassen des Kraftfahrzeuges leicht zerstörbar sind.A disadvantage of this known solution is that both a guide ring and a nozzle orifice are required to guide the air flow, at least the nozzle orifice having a disruptive effect, for example in the area of video-based motor vehicle interior sensors, in front of the sensors. Furthermore, the nozzle covers build on the sensor surface and form sharp edges, in particular when used in a motor vehicle interior, which are also easily destroyed if the occupants of the motor vehicle are careless.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung mit den im Anspruch 1 genannten Merkmalen bietet demgegenüber den Vorteil, dass in einfacher Weise mit einem einfachen, robusten, wartungsfreien und kostengünstigen Aufbau Ablagerungen von Partikeln/Substanzen auf empfindlichen optischen Geräten vermieden werden. Dadurch, dass an dem optischen Gerät mindestens ein, dem optischen Gerät zugeordnetes, die Sensor- Oberfläche nicht einschränkendes Mittel vorgesehen ist, welches richtungsgebend einen vorgebbaren Bereich der Sensor-Oberfläche durch ein zu- und/oder abführbares gasförmiges Medium schützt, werden Ablagerungen von Partikeln/Substanzen auf der Sensor- Oberfläche vermieden.The device according to the invention with the features mentioned in claim 1 offers the advantage that deposits of particles / substances on sensitive optical devices can be avoided in a simple manner with a simple, robust, maintenance-free and inexpensive construction. The fact that at least one, Deposits of particles / substances on the sensor surface are avoided, the means assigned to the optical device, which does not restrict the sensor surface and which provides directional protection for a predeterminable region of the sensor surface by means of a gaseous medium that can be supplied and / or removed.
Vorteilhafterweise kann auf Gehäuse beziehungsweise Gehäusehüllen, die gegebenenfalls die Funktion des Sensors beeinträchtigen, verzichtet werden. Des Weiteren sind wesentlich aufwendigere Verfahren, die zudem sehr wartungsaufwendig sind, wie zum Beispiel die mechanische Lösung einer rotierenden Scheibe, ersetz- bar. Berührende Verfahren, wie Abstreifer und dergleichen, die die Gefahr bergen, dass unter Umständen Schmutzpartikel zwischen den Abstreifer und die Sensor-Oberfläche gelangen und infolge die Sensor- Oberfläche beschädigen, können ebenfalls durch die einfache und kostengünstige erfindungsgemäße Vorrichtung ersetzt werden.It is advantageously possible to dispense with housings or housing casings, which may impair the function of the sensor. Furthermore, much more complex processes, which are also very maintenance-intensive, such as the mechanical solution of a rotating disk, can be replaced. Touching methods, such as wipers and the like, which carry the risk that dirt particles may get between the wiper and the sensor surface and damage the sensor surface as a result, can also be replaced by the simple and inexpensive device according to the invention.
In einer bevorzugten Ausgestaltung der Erfindung wird gemäß Anspruch 2 und 3 das Mittel als ein Zuführungs- kanal und/oder als ein Absaugkanal ausgeführt. Gemäß Anspruch 4 ist damit der Vorteil geschaffen, dass unmittelbar über einem vorgebbaren Bereich des optischen Gerätes das der Sensor-Oberfläche zugeführte, danach an ihr vorbeigeführte und/oder abgeführte gas- förmige Medium eine schützende Querströmung erzeugt. In einer weiteren bevorzugten Ausgestaltung der Erfindung ist gemäß Anspruch 5 der Vorteil geschaffen, dass durch Verbindung des Zuführungskanals mit dem Absaugkanal über eine Verbindungsleitung ein Umluftkreislauf herstellbar ist. Durch ein in die Verbindungsleitung integriertes Gebläse, ein Filter und einen Nebenauslass wird ein kostengünstiger, energiesparender und pulsationsfreier Zirkulationskreislauf geschaffen.In a preferred embodiment of the invention, the agent is designed as a supply channel and / or as a suction channel. According to claim 4, the advantage is created that directly above a predeterminable area of the optical device, the gaseous medium supplied to the sensor surface, then passed and / or removed from it, generates a protective cross flow. In a further preferred embodiment of the invention, the advantage is created according to claim 5 that a circulating air circuit can be produced by connecting the supply duct to the suction duct via a connecting line. A blower, a filter and a secondary outlet integrated in the connecting line create a cost-effective, energy-saving and pulsation-free circulation circuit.
Ferner ist das Mittel gemäß Anspruch 7 als ein Ringspalt oder als ein tangentialer Ringspalt ausbildbar. Gemäß den Ansprüchen 8 und 9 bildet der Ringspalt gemeinsam mit dem Zuführungskanal an dem zu schützen- den Bereich eine Zentralausblasung (Senkenströmung) und im Falle einer Kombination mit dem Absaugkanal eine Zentralabsaugung (Quellenströmung) aus.Furthermore, the means according to claim 7 can be formed as an annular gap or as a tangential annular gap. According to claims 8 and 9, the annular gap forms, together with the supply channel, a central blowout (sink flow) in the area to be protected and, in the case of a combination with the suction channel, a central suction (source flow).
Gemäß Anspruch 10 ist in bevorzugter Ausgestaltung der Erfindung der tangentiale Ringspalt in einem Spiralgehäuse angeordnet, wodurch an dem zu schützenden Bereich eine Wirbelausblasung (Wirbelsenkenströmung) ausbildbar ist.According to claim 10, in a preferred embodiment of the invention, the tangential annular gap is arranged in a spiral housing, as a result of which a vortex blowout (vertebral sink flow) can be formed in the area to be protected.
Als gasförmiges Medium sind sowohl einphasige als auch mehrphasige Mischungen einsetzbar, die alternativ durch eine Aufbereitung bezüglich ihrer Temperatur und/oder Feuchte je nach den gegebenen Randbedingungen einstellbar sind.Both single-phase and multi-phase mixtures can be used as the gaseous medium, which can alternatively be adjusted with respect to their temperature and / or humidity depending on the given boundary conditions.
In einer weiteren bevorzugten Ausgestaltung der Erfindung gemäß Anspruch 12 sind die erzeugten, Schutz bewirkenden Strömungen, gemäß der nebengeordneten Ansprüche 4, 8, 9 und 10, mit mechanischen Schutzelementen kombinierbar. Bei Unterbrechung der durch das zu- und/oder abführbare, gasförmige Medium erzeugten Strömung oder bei Annäherung von Gegenständen, wie zum Beispiel Körperteilen in einem mit Insassen besetzten Kraftfahrzeuginnenraum, klappt, schwenkt oder dreht je nach konstruktiver Ausführung ein Schutzdeckel vor die Sensor-Oberfläche. Dieses Klappen, Schwenken oder Drehen des Schutzdeckels erfolgt automatisch. Zur automatischen Detektion von größeren Gegenständen im Bereich der Sensor-Oberfläche sind verschiedene Verfahren wie zum Beispiel Lichtschranken, Videosensoren, aber auch durch Auswertung von Kamerabildern, mit geeigneten Algorithmen bekannte Verfahren möglich.In a further preferred embodiment of the invention according to claim 12, the protection is generated effecting flows, according to the independent claims 4, 8, 9 and 10, can be combined with mechanical protection elements. If the flow generated by the supply and / or discharge of the gaseous medium is interrupted or if objects such as parts of the body in a passenger compartment occupied by a vehicle approach, a protective cover folds, swivels or rotates in front of the sensor surface, depending on the design. This folding, swiveling or turning of the protective cover takes place automatically. Various methods are known for the automatic detection of larger objects in the area of the sensor surface, for example light barriers, video sensors, but also by evaluating camera images using methods known from suitable algorithms.
Dabei kann das mechanische Schutzelement -der Schutzdeckel- einteilig oder mehrteilig ausgebildet sein. Der Schutzdeckel kann zum Beispiel aus zwei Hälften bestehen, die über die Sensor-Oberfläche klappen. Weitere mögliche Ausführungen, wie zum Beispiel eine Irisblende, eine Schlitzblende, eine gliedförmige Klappe oder ein Schwenkdeckel, sind da- bei genauso ausführbar.The mechanical protective element - the protective cover - can be made in one piece or in several parts. For example, the protective cover can consist of two halves that fold over the sensor surface. Other possible designs, such as an iris diaphragm, a slit diaphragm, a link-shaped flap or a swivel cover, can also be implemented.
Der Schutzdeckel kann erfindungsgemäß zusätzlich mit einem Abstreifer bestückt sein, der die Sensor-Oberfläche beim Auf- und Zuklappen reinigt und eventuelle Rückstände, wie zum Beispiel Fettrückstände von Fingerabdrücken und dergleichen, die durch das eine Strömung erzeugende, gasförmige Medium nicht verhindert werden können, beseitigt.According to the invention, the protective cover can additionally be equipped with a scraper, which cleans the sensor surface when it is opened and closed, and any residues, such as fat residues from fingerprints and the like, which are caused by the one Flow-generating, gaseous medium can not be prevented, eliminated.
Weitere bevorzugte Ausgestaltungen der Erfindung er- geben sich aus den übrigen, in den Unteransprüchen genannten Merkmalen.Further preferred embodiments of the invention result from the other features mentioned in the subclaims.
Zeichnungendrawings
Die Erfindung wird nachfolgend in Ausführungsbeispielen anhand der zugehörigen Zeichnungen näher erläutert. Es zeigen:The invention is explained in more detail below in exemplary embodiments with reference to the associated drawings. Show it:
Figur 1 eine Schnittdarstellung eines optischen Ge- rätes mit einem eine Querströmung erzeugenden Zuführungskanal;FIG. 1 shows a sectional illustration of an optical device with a feed channel generating a cross flow;
Figur 2 eine Ansicht A auf eine Sensor-Oberfläche des optischen Gerätes mit dem die Querströ- mung erzeugenden Zuführungskanal;FIG. 2 shows a view A of a sensor surface of the optical device with the feed channel generating the cross flow;
Figur 3 das optische Gerät mit dem Zuführungskanal und einem Absaugkanal der erzeugten Querströmung und einer Verbindungsleitung;3 shows the optical device with the feed channel and a suction channel of the generated cross flow and a connecting line;
Figur 4 das optische Gerät mit einem über den Absaugkanal eine Quellenströmung erzeugenden Ringspalt;FIG. 4 shows the optical device with an annular gap which generates a source flow via the suction channel;
Figur 5 einen Schnitt A-A des Ringspaltes mit der erzeugten Quellenströmung; Figur 6 das optische Gerät mit einer durch den Ringspalt über den Zuführungskanal erzeugten Senkenströmung;Figure 5 shows a section AA of the annular gap with the generated source flow; FIG. 6 shows the optical device with a sink flow generated by the annular gap via the feed channel;
Figur 7 einen Schnitt A-A des Ringspaltes und der erzeugten Senkenströmung;Figure 7 is a section A-A of the annular gap and the sink flow generated;
Figur 8 das optische Gerät mit einer durch einen tangentialen Ringspalt über den Zuführungskanal erzeugten Wirbelsenkenströmung undFigure 8 shows the optical device with a vortex sink flow generated by a tangential annular gap over the feed channel
Figur 9 einen Schnitt A-A des tangentialen Ringspaltes mit der erzeugten Wirbelsenkenströmung.Figure 9 shows a section A-A of the tangential annular gap with the vortex sink flow generated.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Figur 1 zeigt eine Schnittdarstellung eines optischen Gerätes 100 mit einem eine Querströmung 24 erzeugenden Zuführungskanal 18. Der Zuführungskanal 18 ist ein Mittel 12, welches die Eigenschaft besitzt, die Richtung der Strömung -hier die Querströmung 24- vorzugeben. Dabei wird eine Sensor-Oberfläche 10 des optischen Gerätes 100 nicht eingeschränkt, das heißt, das zu sensierende Zielfeld ist durch den Zu- führungskanal 18 nicht beeinträchtigt. Der Zuführungskanal 18 endet in einem Randbereich des optischen Gerätes 100. An einer Zugangsseite 26 in den Zuführungskanal 18 wird ein gasförmiges Medium 14 eingebracht, mittels dem die gasförmige Querströmung 24 erzeugt wird. Die Figur 1 und Figur 2 zeigt, dass die Sensor-Oberfläche in einem gesamten vorgebbaren Bereich 22 von der Querströmung 24 überströmt wird.FIG. 1 shows a sectional illustration of an optical device 100 with a feed channel 18 that generates a cross flow 24. The feed channel 18 is a means 12 which has the property of specifying the direction of the flow — here the cross flow 24. In this case, a sensor surface 10 of the optical device 100 is not restricted, that is to say the target field to be sensed is not impaired by the feed channel 18. The feed channel 18 ends in an edge region of the optical device 100. A gaseous medium 14 is introduced into the feed channel 18 on an access side 26, by means of which the gaseous cross flow 24 is generated. FIG. 1 and FIG. 2 show that the cross-flow 24 flows over the entire surface area 22 that can be predetermined.
Figur 2 zeigt eine Ansicht A auf die Sensor-Oberfläche 10 des optischen Gerätes 100 mit dem die Querströmung 24 erzeugenden Zuführungskanal 18. Der am Rand des optischen Gerätes 100 angeordnete Zuführungskanal 18 verdeutlicht die unverdeckte Sensor- Oberfläche 10. Der Bereich 22, der von dem gasförmigen Medium 14 geschützt beziehungsweise überstrichen werden soll, ist durch Gestaltung des Zuführungskanals 18 vorgebbar. Durch Halbierung kann beispielsweise erreicht werden, dass nur ein Teilbereich der Sensor-Oberfläche vom gasförmigen Medium 14 durch eine Querströmung 24 überstrichen und geschützt wird.FIG. 2 shows a view A of the sensor surface 10 of the optical device 100 with the feed channel 18 which generates the cross flow 24. The feed channel 18 arranged at the edge of the optical device 100 illustrates the uncovered sensor surface 10. The area 22 which is separated from the gaseous medium 14 to be protected or painted over can be predetermined by designing the feed channel 18. By halving it can be achieved, for example, that only a partial area of the sensor surface is covered by the gaseous medium 14 and protected by a transverse flow 24.
Figur 3 zeigt das optische Gerät 100 mit dem Zuführungskanal 18 und einem Absaugkanal 20, die zur Er- zeugung der Querströmung 24 angeordnet sind. Zudem ist eine Ausgangsseite 28 des Absaugkanals über eine Verbindungsleitung 30 mit der Zugangsseite 26 des Zuführungskanals 18 verbunden. Das gasförmige Medium 14 bildet die Querströmung 24 vorteilhaft vor der Sensor-Oberfläche 10 über den vorgebbaren Bereich 22 aus. In die Verbindungsleitung 30 sind geeignete Anordnungen zur Filtration -ein Filter 34-, zur Erzeugung des Volumenstromes -ein Gebläse 32-, zur Kon- ditionierung des gasförmigen Mediums 14 -eine Aufbereitungsvorrichtung 50- und eine Entlüftungsvorrichtung -ein Nebenauslass 48- zur Vermeidung von Pulsationen integriert. Die Aufbereitungsvorrichtung 50 ist in der Lage, gewünschte Parameter des gasförmigen Mediums 14, wie Temperatur, Feuchte und dergleichen, in einer Art Klimaanlage zu konditionieren, wodurch positive Effekte, wie beispielsweise Beschlagfreiheit der Sensor-Oberfläche 10, erreicht werden.FIG. 3 shows the optical device 100 with the feed channel 18 and a suction channel 20, which are arranged to generate the cross flow 24. In addition, an outlet side 28 of the suction channel is connected to the access side 26 of the feed channel 18 via a connecting line 30. The gaseous medium 14 advantageously forms the cross flow 24 in front of the sensor surface 10 via the predeterminable region 22. In the connecting line 30 there are suitable arrangements for filtration -a filter 34-, for generating the volume flow -a fan 32-, for conditioning the gaseous medium 14 -a processing device 50- and a venting device -a secondary outlet 48- to avoid pulsations integrated. The processing device 50 is able to condition desired parameters of the gaseous medium 14, such as temperature, humidity and the like, in a type of air conditioning system, whereby positive effects, such as, for example, fogging of the sensor surface 10, are achieved.
Figur 4 zeigt das optische Gerät 100 mit einem, über den Absaugkanal 20 eine Quellenströmung 40 erzeugenden Ringspalt 36. Das gasförmige Medium 14 wird hier über den Absaugkanal 20 über die Ausgangsseite 28 angesaugt und erzeugt eine Zentralabsaugung (Quellenströmung 40) an der Sensor-Oberfläche 10. Die An- Ordnung des Ringspalts 36 ist so angeordnet, dass die Sensor-Oberfläche 10 nicht verdeckt ist.FIG. 4 shows the optical device 100 with an annular gap 36 that generates a source flow 40 via the suction channel 20. The gaseous medium 14 is sucked in here via the suction channel 20 via the outlet side 28 and generates a central suction (source flow 40) on the sensor surface 10 The arrangement of the annular gap 36 is arranged such that the sensor surface 10 is not covered.
Figur 5 zeigt in Verbindung mit Figur 4 einen Schnitt A-A des Ringspaltes 36 mit der erzeugten Quellen- Strömung 40, der in den Absaugkanal 20 übergeht. Eine ausreichend starke Ausbildung der Strömung Zentralabsaugung (Quellenströmung 40) erreicht den vollständigen Schutz der Sensor-Oberfläche 10.FIG. 5 shows in connection with FIG. 4 a section A-A of the annular gap 36 with the generated source flow 40, which merges into the suction channel 20. A sufficiently strong formation of the central suction flow (source flow 40) achieves complete protection of the sensor surface 10.
Figur 6 zeigt den umgekehrten Fall der Figur 5 hinsichtlich der Strömungsrichtung, das optische Gerät 100 mit einer durch den Ringspalt 36 über den Zuführungskanal 18 erzeugten Zentralausblasung (Senkenströmung 38) . Hier wird das gasförmige Medium 14 über die Zugangsseite 26 dem Zuführungskanal 18 zugeführt und bildet an der Sensor-Oberfläche eine Zentralausblasung (Senkenströmung 38) aus. Figur 7 zeigt einen zugehörigen Schnitt A-A des Ringspaltes 36 und der erzeugten Zentralausblasung (Senkenströmung 38). Weitere dargestellte Bezugszeichen bedeuten gleiche Teile wie in den vorhergehenden Figuren .FIG. 6 shows the reverse case of FIG. 5 with regard to the direction of flow, the optical device 100 with a central blowout (sink flow 38) generated by the annular gap 36 via the feed channel 18. Here, the gaseous medium 14 is fed to the feed channel 18 via the access side 26 and forms a central blowout (sink flow 38) on the sensor surface. FIG. 7 shows an associated section AA of the annular gap 36 and the central blowout (sink flow 38) generated. Further reference numerals shown mean the same parts as in the previous figures.
Figur 8 zeigt das optische Gerät 100 mit einer durch einen tangentialen Ringspalt 42 über den Zuführungs- kanal 18 erzeugten Zentralausblasung (Wirbelsenkenströmung 48). Die Zuführung des gasförmigen Mediums 14 erfolgt wie in Figur 6 bereits beschrieben.FIG. 8 shows the optical device 100 with a central blowout (vortex sink flow 48) generated by a tangential annular gap 42 via the feed channel 18. The gaseous medium 14 is supplied as already described in FIG. 6.
Der Unterschied besteht in der Ausbildung des tangen- tialen Ringspaltes 42 mit einem Spiralgehäuse 44. Durch das Spiralgehäuse 44 und den damit entstehenden tangentialen Ringspalt 42 wird die Zentralausblasung (Wirbelsenkenströmung) erzeugt.The difference is in the formation of the tangential annular gap 42 with a spiral housing 44. The central blow-out (vortex sink flow) is generated by the spiral housing 44 and the tangential annular gap 42 thus created.
Figur 9 zeigt einen zugehörigen Schnitt A-A des tangentialen Ringspaltes 42 mit einer erzeugten Zentralausblasung (Wirbelsenkenströmung 46) . Gleiche Bezugszeichen bedeuten gleiche Teile.FIG. 9 shows an associated section A-A of the tangential annular gap 42 with a central blowout (vortex sink flow 46). The same reference numerals mean the same parts.
Die beschriebene Vorrichtung zur Vermeidung von Ablagerungen von Partikeln/Substanzen auf einer Sensor- Oberfläche 10 eines optischen Gerätes 100 und die Vorrichtungen 18, 20, 36, 42, 44 der erzeugten, Schutz bewirkenden Strömungen 24, 38, 40, 46 sind mit mechanischen Schutzelementen 16 kombinierbar. Aus Gründen der Übersichtlichkeit wurde auf die Darstellung der mechanischen Schutzelemente 16 in den Figuren verzichtet. The described device for avoiding deposits of particles / substances on a sensor surface 10 of an optical device 100 and the devices 18, 20, 36, 42, 44 of the generated currents 24, 38, 40, 46 are provided with mechanical protective elements 16 combinable. For reasons of clarity, the mechanical protective elements 16 have not been shown in the figures.

Claims

Patentansprüche claims
1. Vorrichtung zur Vermeidung von Ablagerungen von Partikeln/Substanzen auf einer Sensor-Oberfläche eines optischen Gerätes, gekennzeichnet durch mindestens ein, dem optischen Gerät (100) zugeordnetes, die Sensor-Oberfläche (10) nicht einschränkendes Mittel (12), welches richtungsgebend einen vorgebbaren Bereich (22) der Sensor-Oberfläche (10) durch ein zu- und/oder abführbares gasförmiges Medium (14) schützt.1. Device for avoiding deposits of particles / substances on a sensor surface of an optical device, characterized by at least one means (12) which is assigned to the optical device (100) and does not restrict the sensor surface (10) and which provides a directional indicator Predeterminable area (22) of the sensor surface (10) is protected by a gaseous medium (14) that can be supplied and / or removed.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Mittel (12) ein Zuführungskanal (18) ist .2. Device according to claim 1, characterized in that the means (12) is a feed channel (18).
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Mittel (12) ein Absaugkanal (20) ist.3. Device according to claim 1, characterized in that the means (12) is a suction channel (20).
4. Vorrichtung nach Anspruch 1 bis 3, dadurch gekenn- zeichnet, dass mittels des Zuführungskanals (18) und/oder des Absaugkanals (20) an dem zu schützenden Bereich (22) eine Querströmung (24) erzeugbar ist.4. The device according to claims 1 to 3, characterized in that a transverse flow (24) can be generated by means of the feed channel (18) and / or the suction channel (20) at the area (22) to be protected.
5. Vorrichtung nach Anspruch 1 bis 4, dadurch gekenn- zeichnet, dass der Zuführungskanal (18) an seiner Zugangsseite (26) und der Absaugkanal (20) an seiner Ausgangsseite (28) durch eine Verbindungsleitung (30) zu einem Umluft-Kreislauf (32) verbindbar sind.5. The device according to claim 1 to 4, characterized in that the feed channel (18) on its access side (26) and the suction channel (20) on it Output side (28) can be connected to a circulating air circuit (32) by a connecting line (30).
6. Vorrichtung nach Anspruch 5, dadurch gekennzeich- net, dass in die Verbindungsleitung (30) ein Gebläse (32), ein Filter (34) und ein Nebenauslass (48) integrierbar sind.6. The device according to claim 5, characterized in that a blower (32), a filter (34) and a secondary outlet (48) can be integrated into the connecting line (30).
7. Vorrichtung nach Anspruch 1, dadurch gekennzeich- net, dass das Mittel (12) ein Ringspalt (36) oder ein tangentialer Ringspalt (42) ist.7. The device according to claim 1, characterized in that the means (12) is an annular gap (36) or a tangential annular gap (42).
8. Vorrichtung nach Anspruch 1, 2 und 7, dadurch gekennzeichnet, dass der Ringspalt (36) gemeinsam mit dem Zuführungskanal (18) an dem zu schützenden Bereich (22) eine Zentralausblasung (Senkenströmung) (38) ausbildet.8. The device according to claim 1, 2 and 7, characterized in that the annular gap (36) forms, together with the feed channel (18) on the area to be protected (22), a central blowout (sink flow) (38).
9. Vorrichtung nach Anspruch 1, 3 und 7, dadurch ge- kennzeichnet, dass der Ringspalt (36) gemeinsam mit dem Absaugkanal (20) an dem zu schützenden Bereich (22) eine Zentralabsaugung (Quellenströmung) (40) ausbildet .9. The device according to claim 1, 3 and 7, character- ized in that the annular gap (36) forms, together with the suction channel (20) on the area (22) to be protected, a central suction (source flow) (40).
10. Vorrichtung nach Anspruch 1, 2 und 7, dadurch gekennzeichnet, dass der tangentiale Ringspalt (42) in einem Spiralgehäuse (44) an dem zu schützenden Bereich (22) eine Wirbelausblasung (Wirbelsenkenströmung) (46) ausbildet.10. The device according to claim 1, 2 and 7, characterized in that the tangential annular gap (42) in a spiral housing (44) on the area to be protected (22) forms a vortex blowout (vortex sink flow) (46).
11. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das gasförmige Medium (14) eine einphasige oder mehrphasige Mischung ist, welches auch alternativ bezüglich einer Temperatur oder Feuchte in einer Aufbereitungsvorrichtung (50) konditionierbar ist .11. The device according to claim 1, characterized in that the gaseous medium (14) is a single phase or multi-phase mixture, which can also be conditioned alternatively with respect to temperature or humidity in a processing device (50).
12. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Vorrichtungen (18, 20, 36, 42, 44) der erzeugten, Schutz bewirkenden Strömungen (24, 38, 40, 46) mittels des gas- förmigen Mediums (14) mit mechanischen Schutzelementen (16) kombinierbar sind. 12. Device according to one of the preceding claims, characterized in that the devices (18, 20, 36, 42, 44) of the generated, protective flows (24, 38, 40, 46) by means of the gaseous medium (14) can be combined with mechanical protection elements (16).
PCT/DE2003/000930 2002-06-06 2003-03-21 Device for preventing particles/substances from depositing on a sensitive optical unit, particularly on a sensor surface WO2003104052A1 (en)

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