DE4027367C1 - Deposit detector for outer surface of pane - uses radiation source and receiver at right angles to pane esp. windscreen to detect rain drops - Google Patents

Deposit detector for outer surface of pane - uses radiation source and receiver at right angles to pane esp. windscreen to detect rain drops

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Publication number
DE4027367C1
DE4027367C1 DE19904027367 DE4027367A DE4027367C1 DE 4027367 C1 DE4027367 C1 DE 4027367C1 DE 19904027367 DE19904027367 DE 19904027367 DE 4027367 A DE4027367 A DE 4027367A DE 4027367 C1 DE4027367 C1 DE 4027367C1
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Germany
Prior art keywords
radiation
surface
pane
reflector
characterized
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
DE19904027367
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German (de)
Inventor
Kurt 7000 Stuttgart De Hurst
Elmar Dr. 7257 Ditzingen De Rach
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19904027367 priority Critical patent/DE4027367C1/en
Application granted granted Critical
Publication of DE4027367C1 publication Critical patent/DE4027367C1/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60SSERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00Cleaning of vehicles
    • B60S1/02Cleaning windscreens, windows or optical devices
    • B60S1/04Wipers or the like, e.g. scrapers
    • B60S1/06Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818Wipers 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
    • B60S1/0822Wipers 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60SSERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00Cleaning of vehicles
    • B60S1/02Cleaning windscreens, windows or optical devices
    • B60S1/04Wipers or the like, e.g. scrapers
    • B60S1/06Wipers or the like, e.g. scrapers characterised by the drive
    • B60S1/08Wipers or the like, e.g. scrapers characterised by the drive electrically driven
    • B60S1/0818Wipers 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
    • B60S1/0822Wipers 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
    • B60S1/0833Optical rain sensor
    • B60S1/0837Optical rain sensor with a particular arrangement of the optical elements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V8/00Prospecting or detecting by optical means
    • G01V8/10Detecting, e.g. by using light barriers
    • G01V8/12Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G01V8/14Detecting, e.g. by using light barriers using one transmitter and one receiver using reflectors

Abstract

A system for detecting a coating on an outer surface of a pane (21), esp. moisture (26), uses at least one optical radiation source, the radiation of which falls vertically on an incident surface of a radiation conducting body (16) to arrive at a limit point (17) reflecting the radiation, and at a specified angle in the panel (21) which leads to a toal reflection of radiation at the outer clean pane surface within a detection zone to be taken from the radiation conducting body to act on a radiation receiver (25). The radiation source (11) and receiver are arranged on an axis rrunning vertical to the pane surface (23). A reflector (13) is aligned rotationally symmetrical to this axis in the beam path between the radiation source and the light incidence surface of the radiation conducting body. The reflector (13) and the radiation conducting body are positioned in such as way that the radiation (12) from the radiation source enters the radiation conducting body at specified solid angle ranges and establishes the detection zone corresp. to the solid angle ranges on the outer surface. ADVANTAGE - Information signal/interference signal ratio of known unit, e.g. rain sensor, improved.

Description

Die Erfindung geht aus von einer Vorrichtung zum Detektieren eines Belags auf einer äußeren Oberfläche einer Scheibe, insbesondere einer Benetzung mit Feuchtigkeit, nach der Gattung des Hauptan spruchs. The invention proceeds from a device for detecting a coating on an outer surface of a disc, in particular a wetting with moisture, according to the preamble of Hauptan entitlement.

Aus der DE-AS 23 54 100 ist ein Scheibenverschmutzungs melder bekannt, dem ein optisches Meßverfahren zugrundeliegt. From DE-AS 23 54 100, a disc pollution detector is known, the underlying an optical measuring method. Das von einer Lichtquelle durch eine Scheibe ausgesandte Licht trifft auf eine zu prüfende Scheibenoberfläche. The light emitted from a light source through a window light is incident on a test disc surface. Das an der Scheibenober fläche durch die Scheibe hindurch zurückgeworfene Licht wird von einem optischen Sensor erfaßt, an dem ein Signalgeber angeschlossen ist, der beispielsweise einen Wischvorgang eines Scheibenwischers auslösen kann. The upper surface of the disk through the disk reflected light is detected by an optical sensor on which a signal generator is connected, which may cause, for example, a wiping operation of a wiper. Es werden nur diejenigen von der Lichtquelle ausge sandten und an der Scheibenoberfläche zurückgeworfenen Lichtteile vom Sensor erfaßt, die von der Scheibenoberfläche unter dem Winkel der Totalreflexion abgehen, wobei sie beim Verlassen der Scheibe durch eine prismatische Vorrichtung hindurchgeleitet werden. Only those sent out from the light source and detects reflected at the wafer surface light portions by the sensor, which depart from the wafer surface at the angle of total reflection, whereby they are passed through leaving the disc by a prismatic apparatus. Eine Benetzung der äußeren Scheibenoberfläche durch Regen, Feuchtigkeit etc. ändert den Winkelbereich innerhalb dem die Totalreflexion auf tritt und führt daher zu einer Reduzierung des auf den Sensor fallenden Lichtes. A wetting of the outer disk surface by rain, humidity etc. change the angular range within which occurs, the total reflection and, therefore, leads to a reduction of light incident on the sensor light.

Aus der DE-PS 33 14 770 ist eine Einrichtung zum Steuern eines Scheibenwischermotors bekannt, die einen Regensensor enthält, der ebenfalls auf dem optischen Meßverfahren mit Totalreflexion beruht. From DE-PS 33 14 770 a device for controlling a windscreen wiper motor is known which comprises a rain sensor that is also based on the optical measurement method with total reflection. Die von dem Regensensor überwachte Oberfläche der zu reinigenden Scheibe wird begrenzt durch die Forderung nach einem hohen Nutz signal/Störsignal-Verhältnis, das durch die Mehrfachreflexionen kritische Werte annehmen kann. The monitored by the rain sensor surface to be cleaned disk is limited by the requirement for a high useful signal / noise ratio, which may take through the multiple reflections critical values. Zur Erhöhung der sensitiven Fläche ist in der DE-PS 33 14 770 vorgeschlagen worden, anstelle einer Leuchtdiode als Strahlungsquelle mehrere Dioden vorzusehen, die gegebenenfalls mit mehreren lichtempfindlichen Elementen zusammen wirken. In order to increase the sensitive area has been proposed in DE-PS 33 14 770, provide a plurality of diodes in place of a light-emitting diode as a radiation source, which act, if appropriate, with a plurality of photosensitive elements together.

Der Erfindung liegt die Aufgabe zugrunde, das Nutzsignal/Stör signal-Verhältnis einer eingangs genannten Vorrichtung bzw. eines optischen Regensensors bei gegebenen Ab messungen zu verbessern. The object underlying the invention is to improve the useful signal / interference signal ratio of a device as mentioned above or an optical rain sensor for given From measurements.

Die Aufgabe wird durch die im Hauptanspruch angegebenen Merkmale gelöst. The object is achieved by the features specified in the main claim.

Die erfindungsgemäße Vorrichtung weist den Vorteil auf, daß ein gutes Nutzsignal/Störsignal-Verhältnis bei kompakten Abmessungen des Regensensors erreicht wird, wobei nur eine optische Strahlungsquelle sowie ein Strahlungssensor erforderlich sind. The inventive device has the advantage that a good useful signal / interference signal ratio is achieved with compact dimensions of the rain sensor, wherein only one optical radiation source and a radiation sensor are required. Eine Erhöhung der sensitiven Fläche auf der zu überwachenden Scheibenoberfläche durch die erfindungsgemäße Festlegung des optischen Strahlengangs redu ziert die Anzahl der für eine hohe Detektionssicherheit erforder liche Anzahl von Reflexionen. An increase in the sensitive surface on the wafer surface to be monitored by the inventive determination of the optical path redu decorates the number of Necessary to a high detection reliability Liche number of reflections. Bei der erfindungsgemäßen Vorrichtung wird bereits mit einer Reflexion an der äußeren Scheibenoberfläche ein gutes Detektionsergebnis erzielt. In the inventive apparatus a good detection result is already achieved with a reflection on the outer windshield surface.

Vorteilhafte Weiterbildungen und Ausgestaltungen der erfindungsge mäßen Vorrichtung ergeben sich aus Unteransprüchen. Advantageous developments and embodiments of the erfindungsge MAESSEN device result from the subclaims.

Eine einfache Ausgestaltung des Strahlungsreflektors, der die von der optischen Strahlungsquelle emittierte Strahlung in vorgegebene Raumwinkelbereiche reflektiert, ist durch einen Polyeder mit wenig stens drei ebenen reflektierenden Flächen gegeben. A simple embodiment of the radiation reflector that reflects the light emitted from the optical radiation source in predetermined solid angle ranges is given by a polyhedron with little least three planar reflective surfaces. Besonders vor teilhaft ist die Ausgestaltung des Strahlungsreflektors als Kegel, wobei eine rotationssymmetrische Anordnung entsteht, die besonders einfach herstellbar ist. Especially before geous is the design of the radiation reflector as a cone, with a rotationally symmetrical arrangement is formed which is particularly easy to produce.

Der zur Ein- und Auskopplung der optischen Strahlung in die Scheibe vorgesehene Strahlungsleitkörper, der aus Gründen der Materialer sparnis aus separaten Teilen besteht, ist vorzugsweise auf seinem Außenumfang verspiegelt, um eine möglichst verlustarme Reflexion der im Strahlungsleitkörper geführten optischen Strahlung sicherzu stellen. The provided for coupling and decoupling the optical radiation into the pane Strahlungsleitkörper consisting reasons of substantive sparnis of separate parts, preferably mirror-coated on its outer periphery to provide a low-loss as possible reflection of the guided optical radiation in Strahlungsleitkörper sicherzu.

Eine vorteilhafte Weiterbildung der erfindungsgemäßen Vorrichtung sieht eine Abdeckung auf der Innenseite der Scheibe mit optisch dichtem Material vor. An advantageous further development of the device according to the invention provides for a cover on the inside of the disc with an optically dense material. Mit dieser Maßnahme ist eine einfache und preisgünstige Reduzierung der Fremdlichtstrahlung erreichbar. With this measure, a simple and cost-effective reduction of ambient light radiation is achievable.

Fig. 1 zeigt einen Querschnitt durch eine erfindungsgemäße Vorrichtung und Fig. 1 shows a cross section through an inventive device, and

Fig. 2 zeigt eine perspektivische Draufsicht auf eine äußere Scheibenoberfläche. Fig. 2 shows a perspective top view of an outer disk surface.

Fig. 1 zeigt einen Querschnitt durch eine Vorrichtung bzw. einen Regensen sor 10 , der eine Strahlungsquelle 11 enthält, deren Strahlung 12 auf einen Strahlungsreflektor 13 gerichtet wird. Fig. 1 shows a cross section through a device or a Regensen sor 10 which includes a radiation source 11 whose radiation is directed onto a radiation reflector 13 12. Die vom Reflektor 13 reflek tierte Strahlung 14 gelangt unter einem rechtwinkligen Einfalls winkel 15 in einen Strahlungsleitkörper 16 , an dessen äußeren Be grenzung 17 die Strahlung 14 erneut reflektiert wird. The reflectors of the reflector 13 oriented radiation 14 passes under a perpendicular incident angle 15 in a Strahlungsleitkörper 16, limitation at the outer loading 17, the radiation 14 is reflected again. Im Bereich der zu erwartenden Strahlungsreflexion enthält die äußere Begrenzung 17 des Strahlungsleitkörpers 16 eine Verspiegelung 18 . In the range of the expected radiation reflection, the outer boundary 17 of the Strahlungsleitkörpers 16 includes a mirror coating 18th Die an der äußeren Begrenzung 17 reflektierte Strahlung 19 gelangt unter einem bestimmten Einfallswinkel 20 in eine Scheibe 21 . The light reflected at the outer boundary 17 radiation 19 passes below a certain angle of incidence 20 in a disc 21st Zwischen dem Strahlungsleitkörper 16 und der Scheibe 21 ist ein Klebstoff 22 mit optischen Eigenschaften vorgesehen. Between the Strahlungsleitkörper 16 and the disk 21, an adhesive 22 is provided with optical properties. Die Strahlung 19 wird an einer äußeren Scheibenoberfläche 23 teilweise reflektiert und gelangt als reflektierte Strahlung 24 nach einem erneuten Durchgang durch den Strahlungsleitkörper 16 auf einen optischen Strahlungsempfänger bzw. Strah lungssensor 25 . The radiation 19 is reflected at an outer surface of disc 23 and passes partly as reflected radiation 24 for a renewed passage through the Strahlungsleitkörper 16 to an optical radiation receiver or sensor radia tion 25th An der Reflexionsstelle an der äußeren Scheibenoberfläche 23 ein Wassertropfen 26 eingetragen, durch den ein bestimmter Teil 27 der ankommenden Strahlung 19 aus der Scheibe 21 ausgekoppelt wird. Recorded at the reflection point on the outer surface of disk 23 a water droplet 26 through which a certain part of the incoming radiation is coupled out from the disc 21 19 27th

Zwischen dem Strahlungsleitkörper 16 und der Scheibe 21 sind außer halb der optischen Strahlengänge Abdeckungen 28 , 29 aus optisch dichtem Material vorgesehen. Between the Strahlungsleitkörper 16 and the disk 21 are outside of the optical beam paths covers 28, 29 are provided from optically dense material. Der Abstand zwischen Strahlungsleit körper 16 und Scheibe 21 , der einerseits von den Abdeckungen 28 , 29 und andererseits von dem Klebstoff 22 ausgefüllt wird, ist in Fig. 1 übertrieben groß gezeigt. The distance between Strahlungsleit body 16 and disk 21, which is filled on the one hand by the covers 28, 29 and the other part of the adhesive 22 is shown exaggerated in FIG. 1.

Die Strahlungsquelle 11 und der Sensor 25 sind auf einer Halterung 30 angeordnet, die an einem Gehäuse 31 des Regensensors 10 abge stützt ist. The radiation source 11 and the sensor 25 are arranged on a holder 30 which is supported abge to a housing 31 of the rain sensor 10th Die Angrenzung des Gehäuses 31 an die Scheibe 21 trägt die Bezugszahl 33 . The abutment of the housing 31 to the disc 21 carries the reference numeral 33rd

Fig. 2 zeigt eine perspektivische Draufsicht auf die Scheibe 21 im Bereich des optischen Regensensors 10 , der in Fig. 2 hinter der Scheibe 21 angeordnet ist. Fig. 2 shows a perspective top view of the disk 21 in the area of optical rain sensor 10 which is disposed in FIG. 2 behind the window 21. Diejenigen Teile, die den in Fig. 1 gezeigten Teilen entsprechen, tragen in Fig. 2 dieselben Bezugszahlen wie in Fig. 1. Fig. 2 verdeutlicht eine sensitive Fläche 32 auf der äußeren Oberfläche 23 der Scheibe 21 . Those parts corresponding to the parts shown in Fig. 1 are given in Fig. 2, the same reference numerals as in Fig. 1. Fig. 2 shows a sensitive surface 32 on the outer surface 23 of the disk 21. Die Fläche 32 ist der die von der Strahlung 19 erfaßte Sensorfläche. The surface 32 is of the detected radiation from the sensor 19 surface. Strich liniert sind eingetragen die Angrenzung 33 des Gehäuses 31 an die Scheibe 21 sowie die Abdeckungen 28 , 29 . Ruled bar are entered the abutment 33 of the housing 31 to the disk 21 and the covers 28, 29th Die sensitive Fläche 32 , die durch zwei konzentrische Kreise begrenzt ist, entsteht, wenn der Strahlungsreflektor 13 als Kegel realisiert ist, wobei zusammen mit dem Strahlungsleitkörper 16 ein rotationssymmetrischer Aufbau des Regensensors 10 entsteht. The sensitive area 32 which is bounded by two concentric circles that arises when the radiation reflector 13 is realized as a cone, wherein together with the Strahlungsleitkörper 16 a rotation-symmetrical structure of the rain sensor 10 is formed.

Die erfindungsgemäße Vorrichtung wird anhand der beiden Figuren näher erläutert: The device of the invention is illustrated by the two figures:

Die von der Strahlungsquelle 11 emittierte Strahlung 12 gelangt auf den Strahlungsreflektor 13 , dessen Oberfläche zum Erzielen eines hohen Reflexionsgrades verspiegelt sein kann. The radiation emitted from the radiation source 11 radiation 12 reaches the radiation reflector 13, the surface can be mirrored to obtain a high reflectance. Der Strahlungsre flektor 13 ist beispielsweise als Kegel realisiert, mit dem die in Fig. 2 gezeigte kreisringförmige sensitive Fläche 32 erzielt wird. The Strahlungsre Flektor 13 is realized, for example as a cone, with the annular sensitive area shown in Fig. 2 is achieved 32nd In einer anderen Ausgestaltung kann der Strahlungsreflektor 13 als polyeder mit wenigstens drei ebenen Reflexionsflächen ausgebildet sein. In another embodiment of the radiation reflector may be formed 13 as a polyhedron with at least three plane reflection surfaces. Anstelle der kreisförmigen sensitiven Fläche 32 entstehen dann mehreckförmige Flächen 32 und anstelle des kreisförmigen Gehäuses 31 wird dann vorzugsweise ein mehreckiges Gehäuse vorgesehen, dessen Eckenanzahl der Anzahl der vom Strahlungsreflektor 13 in unter schiedliche Richtungen reflektierten Strahlungsanteile entspricht. Instead of the circular sensitive area 32 then mehreckförmige surfaces arise 32 and a polygonal housing, instead of the circular housing 31 is then preferably provided, the number of corners corresponds to the number of radiation reflected from the reflector 13 in directions under schiedliche radiation components.

Die von dem Strahlungsreflektor 13 reflektierte Strahlung 14 gelangt in den Strahlungsleitkörper 16 . The reflected radiation from the reflector 13 radiation 14 enters the Strahlungsleitkörper sixteenth Der Einfallswinkel beträgt hierbei etwa 90 Grad an jedem Ort der Oberfläche. The angle of incidence is in this case about 90 degrees at each location of the surface. Die Oberfläche des Strahlungsleitkörpers 16 ist daher vorzugsweise an die Oberfläche des Strahlungsreflektors 13 anzupassen, so daß die Bedingung des wenigstens näherungsweise rechtwinkligen Strahlungseinfalls an allen Orten erfüllt ist. The surface of the Strahlungsleitkörpers 16 is therefore preferably adapted to the surface of the radiation reflector 13, so that the condition of at least approximately rectangular incident radiation is satisfied in all places. Der rechtwinklige Strahlungseinfall führt zu geringsten Strahlungsverlusten. The rectangular incident radiation leads to lowest radiation losses.

Der Reflektor 13 weist vorzugsweise eine gekrümmte, konvexe Ober fläche auf, so daß eine fokussierende Wirkung entsteht. The reflector 13 preferably has a curved, convex upper surface so that a focusing effect is produced. Die von der Strahlungsquelle 11 emittierte, im allgemeinen divergente Strahlung wird zu einem Parallelstrahlenbündel zusammegeführt. The radiation emitted from the radiation source 11, divergent generally radiation is zusammegeführt to a parallel beam. Der im Strahlungsleitkörper 16 geführte Teil der Strahlung 14 wird an der äußeren Begrenzung 17 des Strahlungsleitkörpers 16 reflektiert. The guided in Strahlungsleitkörper 16 part of the radiation 14 is reflected at the outer boundary 17 of the Strahlungsleitkörpers sixteenth Der Strahlungsleitkörper 16 kann beispielsweise an dieser Stelle poliert sein, um einen hohen Reflexionsgrad zu erzielen. The Strahlungsleitkörper 16 may be polished, for example, at this point in order to achieve a high reflectance. In einer weiteren oder anderen Ausgestaltung kann die in Fig. 1 eingetragene Ver spiegelung 18 auf der äußeren Begrenzung 17 aufgebracht sein. In a further or another embodiment, the registered in Fig. 1 can Ver reflex be applied 18 to the outer boundary of the seventeenth Die erneut reflektierte Strahlung 19 gelangt unter dem bestimmten Ein fallswinkel 20 in die Scheibe 21 . The re-reflected radiation 19 passes under the particular angle of incidence A 20 in the disc 21st Hierbei ist es zweckmäßig, daß der Strahlungsleitkörper 16 zum einen dicht an die Scheibe 21 angrenzt und zum anderen denselben Brechungsindex wie die Scheibe 21 auf weist. It is expedient that the Strahlungsleitkörper 16 for a sealing adjacent to the disk 21 and on the other the same refractive index as the disc 21 has. Mit diesen Maßnahmen werden die Reflexionsverluste an der Übergangsstelle minimiert. With these measures the reflection losses are minimized at the crossing point. Der gegebenenfalls vorgesehene Klebstoff 22 , mit dem der Strahlungsleitkörper 16 mit der Scheibe 21 verklebt werden kann, weist deshalb zweckmäßigerweise ebenfalls dieselben optischen Eigenschaften, insbesondere den gleichen Brechungsindex auf. The optionally provided adhesive 22 with which the Strahlungsleitkörper 16 can be glued to the disc 21, therefore advantageously also has the same optical properties, in particular the same refractive index.

Die in die Scheibe 21 eingekoppelte Strahlung 19 wird an deren äußeren Oberfläche 23 reflektiert. The light coupled into the disk 21 radiation 19 is reflected at the outer surface thereof 23rd Angestrebt wird an dieser Stelle eine Totalreflexion. The aim at this point is a total reflection. Der Einfallswinkel 20 bezüglich einer Flächen normalen auf der Scheibenoberfläche 23 muß deshalb einen bestimmten Wert überschreiten, der vom Material der Scheibe 21 und von dem die Scheibe 21 umgebenden Medium abhängt. The incident angle 20 with respect to a surface normal to the wafer surface 23, therefore, must exceed a certain value, which depends on the material of the disc 21 and of the disk 21 surrounding medium. Der minimale Wert des Ein fallswinkels 20 liegt bei einer Glasscheibe, die von Luft umgeben ist, bei etwa 42 Grad. The minimum value of a fall angle 20 is a glass sheet, which is surrounded by air at about 42 degrees. Die von der sauberen äußeren Scheibenober fläche total reflektierte Strahlung 24 gelangt auf den Sensor 25 , der ein Signal an eine in den Figuren nicht dargestellte und nicht näher beschriebene Schaltungsanordnung abgibt, die beispielsweise Steuersignale für eine ebenfalls nicht gezeigte Scheibenwischwasch anlage abgeben kann. The area of the clean outer disc upper totally reflected radiation 24 reaches the sensor 25, in the figures of the not shown a signal to and outputting circuit arrangement not described in detail, which can deliver, for example, control signals for a likewise not shown windshield wiper washer system. Eine Benetzung der äußeren Oberfläche 23 im Bereich der Reflexionsstelle, die innerhalb der in Fig. 2 gezeigten sensitiven Fläche 32 liegt, beispielsweise mit dem in Fig. 1 ge zeigten Wassertropfen 26 , führt zu einer Auskopplung 27 eines Teils der einfallenden Strahlung 19 . A wetting of the outer surface 23 in the region of the reflection point, which is within the embodiment shown in FIG. 2, the sensitive surface 32, for example, the GE in Fig. 1 showed water droplets 26, resulting in an out-coupling 27 a portion of the incident radiation 19th Die ausgekoppelte Strahlung 27 ent spricht einer Verluststrahlung in die Umgebung. The radiation decoupled 27 ent speaks a radiation loss into the environment. Diese Strahlungsaus kopplung findet deshalb statt, weil die Brechzahl von Wasser höher ist als die von Luft, wobei der Einfallswinkel 17 für eine Total reflexion erhöht wird. This Strahlungsaus coupling occurs because the refractive index of water is higher than that of air, the incident angle 17 is increased for a total reflection. Eine Totalreflexion würde jetzt erst bei einem Einfallswinkel 20 auftreten, der mehr als etwa 63 Grad be trägt. A total reflection would occur only now at an incident angle 20 carrying more than about 63 degrees be. Eine Verschmutzung im Bereich der Reflexionsstellen führt zu einer Absorption eines Teils der einfallenden Strahlung 19 und reduziert den Anteil totalreflektierter Strahlung 24 . A contamination in the region of the reflection points leads to an absorption of a part of the incident radiation 19, and reduces the fraction of total radiation reflected 24th Der Sensor spricht deshalb auch auf feuchten Schmutz oder beispielsweise Insektenrückstände auf der Oberfläche 23 an. Therefore, the sensor is also responsive to damp dirt or insects, for example, residues on the surface 23rd

In der in Fig. 1 gezeigten Anordnung des Regensensors 10 ist der optische Sensor 25 von einem durch die äußere Scheibenoberfläche 23 eindringenden Fremdlichtstrahlungsanteil beaufschlagt. In the embodiment shown in FIG. 1 arrangement of the rain sensor 10, the optical sensor 25 is acted upon by a penetrating through the outer surface 23 of disc extraneous light radiation portion. Eine Redu zierung der Fremdstrahlung ist durch die Abdeckungen 28 , 29 möglich, die beispielsweise zwischen dem Strahlungsleitkörper 16 und der Scheibe 21 gegebenenfalls in Verbindung mit dem Kleber 22 vorgesehen sind. A Redu cation of the extraneous radiation is possible through the covers 28, 29, with the 22 are provided, for example, between the Strahlungsleitkörper 16 and the plate 21 optionally in conjunction adhesive. Die Abmessungen der Abdeckungen 28 , 29 sind an den zu er wartenden Strahlengang anzupassen. The dimensions of the covers 28, 29 are to be adapted to the waiting for it light path. Bei der in Fig. 2 gezeigten rotationssymmetrischen Ausgestaltung des Regensensors 10 , bei dem der Strahlungsreflektor 13 als Kegel ausgebildet ist, wobei die kreisförmige sensitive Fläche 32 entsteht, sind die Abdeckungen 28 , 29 ebenfalls zweckmäßigerweise kreisförmig ausgebildet. In the embodiment shown in Fig. 2 rotationally symmetrical design of the rain sensor 10, wherein said radiation reflector 13 is formed as a cone, wherein the circular sensitive area 32 is formed which covers 28, 29 are also advantageously circular. Bei eckigen Gehäusen 31 , die zu einer eckigen Angrenzung 33 des Gehäuses 31 an die Scheibe 21 führen, ist eine entsprechende Ausgestaltung der Abdeckungen 28 , 29 vorgesehen. In square housings 31, leading to an angular abutment 33 of the housing 31 to the disk 21, a suitable design of the covers 28, provided 29th

Sowohl die Strahlungsquelle 11 als auch der Sensor 25 können an der Halterung 30 montiert sein, die gegen das Gehäuse 31 abgestützt ist. Both the radiation source 11 and the sensor 25 may be mounted to the bracket 30, which is supported against the housing 31st Die erforderlichen Abstützungen der Halterung 30 sind im Vergleich zu den Abmessungen der Strahlengänge gering und beeinträchtigen deshalb die optische Strahlung nur geringfügig. The necessary supports of the holder 30 are small in comparison to the dimensions of the beam paths and thus affect the optical radiation only slightly.

Aus Gründen der Materialersparnis kann der Strahlungsleitkörper 16 aufgeteilt sein in zwei separate Teile. For reasons of material savings of Strahlungsleitkörper may be divided 16 into two separate parts. In einem Teil wird die ein fallende Strahlung 14 sowie die an der äußeren Begrenzung 17 reflek tierte Strahlung 19 und im anderen Teil die an der äußeren Scheiben oberfläche 23 totalreflektierte Strahlung 24 geführt. In one part of which a decreasing radiation 14 and are reflected on the outer boundary 17 oriented radiation 19 and in the other part, the surface of the outer discs 23 totally reflected radiation 24 is guided. Die Ausbildung des Strahlungsleitkörpers 16 als ein einziges Stück, das beispiels weise bei rotationssymmetrischem Aufbau des Regensensors 10 als Drehteil herstellbar ist, kann kostengünstiger als eine zweiteilige Realisierung sein. The formation of the Strahlungsleitkörpers 16 is manufactured as a turned part as a single piece, the example, in a rotationally symmetrical construction of the rain sensor 10 can be cheaper than a two-part implementation.

Claims (7)

1. Vorrichtung zum Detektieren eines Belags auf einer äußeren Ober fläche einer Scheibe, insbesondere einer Benetzung mit Feuchtigkeit, mit wenigstens einer optischen Strahlungsquelle, deren Strahlung im wesentlichen senkrecht auf eine Lichteintrittsfläche eines Strahlungsleitkörpers fällt, im Strahlungsleitkörper zu einer äußeren reflektierenden Begrenzung desselben gelangt, dort reflektiert wird, danach in die Scheibe unter einem vorgegebenen Winkel eingekoppelt wird, der zu einer Totalreflektion der Strahlung an der äußeren, sauberen Scheibenoberfläche innerhalb einer Detektionszone führt, danach aus der Scheibe über den Strahlungsleitkörper ausgekoppelt wird und einen Strahlungsempfänger beaufschlagt, dadurch gekenn zeichnet, daß die Strahlungsquelle ( 11 ) und der Strahlungsempfänger ( 25 ) auf einer senkrecht zur Scheibenoberfläche ( 23 ) verlaufenden Achse angeordnet sind, daß ein drehsymmetrisch zu dieser Achse aus gerichteter Reflektor ( 13 ) im Strahlengan 1. A device for detecting a coating on an outer top surface of a pane, in particular a wetting with moisture, with at least one optical radiation source whose radiation is incident substantially perpendicular to a light entrance surface of a Strahlungsleitkörpers, reaches the same in Strahlungsleitkörper to an outer reflective boundary, there is reflected, is then coupled into the pane at a predetermined angle, which leads to a total reflection of the radiation on the outer clean wafer surface within a detection zone, is subsequently coupled out of the disc about the Strahlungsleitkörper and acts upon a radiation receiver, characterized in that the radiation source (11) and the radiation receiver (25) on a perpendicular to the disk surface (23) extending axis, in that a rotationally symmetrical to said axis of directional reflector (13) in the Strahlengan g zwischen der Strahlungs quelle ( 11 ) und der Lichteintrittsfläche des Strahlungsleitkörpers ( 16 ) vorgesehen ist und daß der Reflektor ( 13 ) und der Strahlungs leitkörper ( 16 ) so ausgelegt sind, daß die Strahlung ( 12 ) der Strahlungsquelle ( 11 ) in vorgegebenen Raumwinkelbereichen in den Strahlungsleitkörper ( 16 ) eintritt und auf der Scheibenoberfläche ( 23 ) die diesen Raumwinkelbereichen entsprechende Detektionszone festlegt. g source between the radiation (11) and the light entry surface of the Strahlungsleitkörpers (16) is provided and that the reflector (13) and said radiation conducting body (16) are designed so that the radiation (12) of the radiation source (11) in predetermined spatial angle regions enters the Strahlungsleitkörper (16) and on the wafer surface (23) sets the this solid angle ranges corresponding detection zone.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Strahlungsleitkörper ( 16 ) einteilig ausgebildet ist. 2. Device according to claim 1, characterized in that the Strahlungsleitkörper (16) is integrally formed.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Strahlungsreflektor ( 13 ) kegelförmig ausgebildet ist. 3. Device according to claim 1 or 2, characterized in that the radiation reflector (13) is cone-shaped.
4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Strahlungsreflektor ( 13 ) als Polyeder mit wenigstens drei ebenen reflektierenden Flächen ausgebildet ist. 4. Device according to claim 1 or 2, characterized in that the radiation reflector (13) is formed as a polyhedron having at least three flat reflective surfaces.
5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die Oberfläche des Reflektors ( 13 ) gekrümmt ist. 5. The device according to claim 3 or 4, characterized in that the surface of the reflector (13) is curved.
6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die äußere Begrenzung ( 17 ) des Strahlungsleit körpers ( 16 ) verspiegelt ist. 6. Device according to one of the preceding claims, characterized in that the outer boundary (17) of Strahlungsleit body (16) is mirrored.
7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zwischen dem Strahlungsleitkörper ( 16 ) und der Scheibe ( 21 ) Abdeckungen ( 28 , 29 ) zur Abschirmung von Fremdstrahlung vorgesehen sind. 7. Device according to one of the preceding claims, characterized in that between the Strahlungsleitkörper (16) and the disc (21) covers (28, 29) are provided for shielding extraneous radiation.
DE19904027367 1990-08-30 1990-08-30 Deposit detector for outer surface of pane - uses radiation source and receiver at right angles to pane esp. windscreen to detect rain drops Expired - Fee Related DE4027367C1 (en)

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