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 dropsInfo
- 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
- Authority
- DE
- Germany
- Prior art keywords
- radiation
- pane
- reflector
- guide body
- radiation source
- 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 - Lifetime
Links
- 230000005855 radiation Effects 0.000 title claims abstract description 110
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 240000004752 Laburnum anagyroides Species 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 238000011161 development Methods 0.000 description 2
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Classifications
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- 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
-
- 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
- B60S1/0837—Optical rain sensor with a particular arrangement of the optical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
- G01V8/14—Detecting, e.g. by using light barriers using one transmitter and one receiver using reflectors
Abstract
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 is based on a device for detecting a Coverings on an outer surface of a pane, in particular a wetting with moisture, after the kind of the main one saying.
Aus der DE-AS 23 54 100 ist ein Scheibenverschmutzungs melder bekannt, dem ein optisches Meßverfahren zugrundeliegt. Das von einer Lichtquelle durch eine Scheibe ausgesandte Licht trifft auf eine zu prüfende Scheibenoberfläche. 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. 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. 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. From DE-AS 23 54 100 is a window contamination known detector, which is based on an optical measurement method. The light emitted by a light source through a pane on a pane surface to be tested. That on the top of the window Light reflected back through the pane is emitted by an optical sensor to which a signal generator is connected is, for example, a wiping process of a wiper can trigger. Only those from the light source are emitted sent and parts of light reflected on the surface of the pane detected by the sensor from the disc surface at the angle total reflection going off when leaving the window be passed through a prismatic device. A Wetting of the outer pane surface by rain, moisture etc. changes the angular range within which the total reflection occurs and therefore leads to a reduction in the sensor falling 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. 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. 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.From DE-PS 33 14 770 is a device for controlling a Wiper motor known that includes a rain sensor that also based on the optical measurement method with total reflection. The surface of the surface to be cleaned, monitored by the rain sensor Disk is limited by the demand for high utility signal / interference signal ratio caused by the multiple reflections can assume critical values. To increase the sensitive area has been proposed in DE-PS 33 14 770, instead of one Light-emitting diode to provide several diodes as the radiation source optionally together with several photosensitive elements Act.
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 invention has for its object the useful signal / interference signal ratio of a device mentioned at the beginning or an optical rain sensor at given Ab to improve measurements.
Die Aufgabe wird durch die im Hauptanspruch angegebenen Merkmale gelöst.The task is characterized by the features specified in the main claim solved.
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. 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. Bei der erfindungsgemäßen Vorrichtung wird bereits mit einer Reflexion an der äußeren Scheibenoberfläche ein gutes Detektionsergebnis erzielt. The device according to the invention has the advantage that a good useful signal / interference signal ratio with compact dimensions of the Rain sensor is reached, with only one optical radiation source and a radiation sensor are required. An increase in sensitive area on the surface to be monitored the inventive determination of the optical beam path redu adorns the number required for high detection reliability number of reflections. In the device according to the invention is already with a reflection on the outer surface of the pane achieved a good detection result.
Vorteilhafte Weiterbildungen und Ausgestaltungen der erfindungsge mäßen Vorrichtung ergeben sich aus Unteransprüchen.Advantageous further developments and refinements of the invention moderate device result from 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. Besonders vor teilhaft ist die Ausgestaltung des Strahlungsreflektors als Kegel, wobei eine rotationssymmetrische Anordnung entsteht, die besonders einfach herstellbar ist.A simple design of the radiation reflector that the of the optical radiation source emitted radiation in predetermined Solid angle ranges are reflected by a polyhedron with little given at least three flat reflective surfaces. Especially before the configuration of the radiation reflector as a cone is partial, whereby a rotationally symmetrical arrangement arises, which is particularly is easy to manufacture.
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 one for coupling and decoupling the optical radiation into the pane provided radiation guide, which for reasons of the material saving consists of separate parts, is preferably on his Mirrored outer circumference to reflect the loss as little as possible optical radiation guided in the radiation guide body put.
Eine vorteilhafte Weiterbildung der erfindungsgemäßen Vorrichtung sieht eine Abdeckung auf der Innenseite der Scheibe mit optisch dichtem Material vor. Mit dieser Maßnahme ist eine einfache und preisgünstige Reduzierung der Fremdlichtstrahlung erreichbar.An advantageous development of the device according to the invention sees a cover on the inside of the pane with optical dense material. This measure is simple and affordable reduction of extraneous light radiation 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. 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. Im Bereich der zu erwartenden Strahlungsreflexion enthält die äußere Begrenzung 17 des Strahlungsleitkörpers 16 eine Verspiegelung 18. Die an der äußeren Begrenzung 17 reflektierte Strahlung 19 gelangt unter einem bestimmten Einfallswinkel 20 in eine Scheibe 21. Zwischen dem Strahlungsleitkörper 16 und der Scheibe 21 ist ein Klebstoff 22 mit optischen Eigenschaften vorgesehen. 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. 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. Fig. 1 shows a cross section through a device or a rain sensor 10 , which contains a radiation source 11 , the radiation 12 is directed onto a radiation reflector 13 . The reflected by the reflector 13 radiation 14 arrives at a right angle incidence 15 in a radiation guide body 16 , at the outer limit 17 Be the radiation 14 is reflected again. In the area of the radiation reflection to be expected, the outer boundary 17 of the radiation guide body 16 contains a mirror coating 18 . The radiation 19 reflected at the outer boundary 17 reaches a pane 21 at a certain angle of incidence 20 . An adhesive 22 with optical properties is provided between the radiation guide body 16 and the disk 21 . The radiation 19 is partially reflected on an outer pane surface 23 and passes as reflected radiation 24 after passing through the radiation guide 16 again onto an optical radiation receiver or radiation sensor 25 . A water drop 26 is entered at the reflection point on the outer pane surface 23 , through which a certain part 27 of the incoming radiation 19 is coupled out of the pane 21 .
Zwischen dem Strahlungsleitkörper 16 und der Scheibe 21 sind außer halb der optischen Strahlengänge Abdeckungen 28, 29 aus optisch dichtem Material vorgesehen. 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.Between the radiation guide body 16 and the disk 21 , covers 28 , 29 made of optically dense material are provided in addition to half of the optical beam paths. The distance between the radiation guide body 16 and the disk 21 , which is filled on the one hand by the covers 28 , 29 and on the other hand by the adhesive 22 , is shown exaggeratedly large 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. Die Angrenzung des Gehäuses 31 an die Scheibe 21 trägt die Bezugszahl 33. The radiation source 11 and the sensor 25 are arranged on a holder 30 which is supported on a housing 31 of the rain sensor 10 . The abutment of the housing 31 on the disk 21 has the reference number 33 .
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. 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. Die Fläche 32 ist der die von der Strahlung 19 erfaßte Sensorfläche. Strich liniert sind eingetragen die Angrenzung 33 des Gehäuses 31 an die Scheibe 21 sowie die Abdeckungen 28, 29. 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. FIG. 2 shows a perspective top view of the pane 21 in the region of the optical rain sensor 10 , which is arranged behind the pane 21 in FIG. 2. Those parts which correspond to the parts shown in FIG. 1 have the same reference numbers in FIG. 2 as in FIG. 1. FIG. 2 illustrates a sensitive surface 32 on the outer surface 23 of the pane 21 . The area 32 is that of the sensor area detected by the radiation 19 . The border 33 of the housing 31 on the pane 21 and the covers 28 , 29 are shown in dashed lines. The sensitive surface 32 , which is delimited by two concentric circles, arises when the radiation reflector 13 is implemented as a cone, a rotation-symmetrical structure of the rain sensor 10 being formed together with the radiation guide body 16 .
Die erfindungsgemäße Vorrichtung wird anhand der beiden Figuren näher erläutert:The device according to the invention is based on the two figures explained in more detail:
Die von der Strahlungsquelle 11 emittierte Strahlung 12 gelangt auf den Strahlungsreflektor 13, dessen Oberfläche zum Erzielen eines hohen Reflexionsgrades verspiegelt sein kann. Der Strahlungsre flektor 13 ist beispielsweise als Kegel realisiert, mit dem die in Fig. 2 gezeigte kreisringförmige sensitive Fläche 32 erzielt wird. In einer anderen Ausgestaltung kann der Strahlungsreflektor 13 als polyeder mit wenigstens drei ebenen Reflexionsflächen ausgebildet sein. 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. The radiation 12 emitted by the radiation source 11 reaches the radiation reflector 13 , the surface of which can be mirrored in order to achieve a high degree of reflection. The radiation reflector 13 is implemented, for example, as a cone, with which the annular sensitive surface 32 shown in FIG. 2 is achieved. In another embodiment, the radiation reflector 13 can be designed as a polyhedron with at least three flat reflection surfaces. Instead of the circular sensitive area 32 then mehreckförmige surfaces arise 32 and a polygonal housing, instead of the circular housing 31 is then provided preferably corresponds to the number of corners of the number of radiation from the reflector 13 in the reflected radiation components under schiedliche directions.
Die von dem Strahlungsreflektor 13 reflektierte Strahlung 14 gelangt in den Strahlungsleitkörper 16. Der Einfallswinkel beträgt hierbei etwa 90 Grad an jedem Ort der Oberfläche. 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. Der rechtwinklige Strahlungseinfall führt zu geringsten Strahlungsverlusten.The radiation 14 reflected by the radiation reflector 13 reaches the radiation guide body 16 . The angle of incidence is about 90 degrees at any location on the surface. The surface of the radiation guide body 16 is therefore preferably to be adapted to the surface of the radiation reflector 13 , so that the condition of the at least approximately rectangular radiation incidence is met at all locations. The right-angled radiation incidence leads to minimal radiation losses.
Der Reflektor 13 weist vorzugsweise eine gekrümmte, konvexe Ober fläche auf, so daß eine fokussierende Wirkung entsteht. Die von der Strahlungsquelle 11 emittierte, im allgemeinen divergente Strahlung wird zu einem Parallelstrahlenbündel zusammegeführt. Der im Strahlungsleitkörper 16 geführte Teil der Strahlung 14 wird an der äußeren Begrenzung 17 des Strahlungsleitkörpers 16 reflektiert. Der Strahlungsleitkörper 16 kann beispielsweise an dieser Stelle poliert sein, um einen hohen Reflexionsgrad zu erzielen. In einer weiteren oder anderen Ausgestaltung kann die in Fig. 1 eingetragene Ver spiegelung 18 auf der äußeren Begrenzung 17 aufgebracht sein. Die erneut reflektierte Strahlung 19 gelangt unter dem bestimmten Ein fallswinkel 20 in die Scheibe 21. 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. Mit diesen Maßnahmen werden die Reflexionsverluste an der Übergangsstelle minimiert. 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 reflector 13 preferably has a curved, convex upper surface, so that a focusing effect is created. The generally divergent radiation emitted by the radiation source 11 is brought together to form a parallel beam. The guided in Strahlungsleitkörper 16 part of the radiation 14 is reflected at the outer boundary 17 of the Strahlungsleitkörpers sixteenth The radiation guide body 16 can, for example, be polished at this point in order to achieve a high degree of reflection. In a further or another embodiment, the reflection 18 entered in FIG. 1 can be applied to the outer boundary 17 . The re-reflected radiation 19 passes under the determined angle of incidence 20 into the pane 21 . It is expedient that the Strahlungsleitkörper 16 for a sealing adjacent to the disk 21 and has on the other hand the same refractive index as the disc 21st With these measures, the reflection losses at the transition point are minimized. The optionally provided adhesive 22 , with which the radiation guide body 16 can be glued to the pane 21 , therefore expediently 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. Angestrebt wird an dieser Stelle eine Totalreflexion. 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. Der minimale Wert des Ein fallswinkels 20 liegt bei einer Glasscheibe, die von Luft umgeben ist, bei etwa 42 Grad. 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. 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. Die ausgekoppelte Strahlung 27 ent spricht einer Verluststrahlung in die Umgebung. 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. Eine Totalreflexion würde jetzt erst bei einem Einfallswinkel 20 auftreten, der mehr als etwa 63 Grad be trägt. Eine Verschmutzung im Bereich der Reflexionsstellen führt zu einer Absorption eines Teils der einfallenden Strahlung 19 und reduziert den Anteil totalreflektierter Strahlung 24. Der Sensor spricht deshalb auch auf feuchten Schmutz oder beispielsweise Insektenrückstände auf der Oberfläche 23 an.The radiation 19 coupled into the pane 21 is reflected on its outer surface 23 . At this point, total reflection is sought. The angle of incidence 20 with respect to a surface normal on the pane surface 23 must therefore exceed a certain value which depends on the material of the pane 21 and on the medium surrounding the pane 21 . The minimum value of the drop angle 20 is about 42 degrees for a glass pane surrounded by air. The radiation 24 totally reflected from the clean outer surface of the pane reaches the sensor 25 , which emits a signal to a circuit arrangement, not shown in the figures and not described in detail, which, for example, can emit control signals for a windshield washer system, also not shown. Wetting the outer surface 23 in the region of the reflection point, which lies within the sensitive area 32 shown in FIG. 2, for example with the water drop 26 shown in FIG. 1, leads to a coupling-out 27 of part of the incident radiation 19 . The outcoupled radiation 27 corresponds to a loss of radiation in the environment. This radiation coupling takes place because the refractive index of water is higher than that of air, the angle of incidence 17 being increased for a total reflection. A total reflection would now only occur at an angle of incidence 20 that is more than about 63 degrees. Contamination in the area of the reflection points leads to absorption of part of the incident radiation 19 and reduces the proportion of totally reflected radiation 24 . The sensor therefore also responds to moist dirt or, for example, insect residues on the surface 23 .
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. 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. Die Abmessungen der Abdeckungen 28, 29 sind an den zu er wartenden Strahlengang anzupassen. 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. 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 the arrangement of the rain sensor 10 shown in FIG. 1, the optical sensor 25 is acted upon by an external light radiation component penetrating through the outer pane surface 23 . A reduction of the external radiation is possible through the covers 28 , 29 , which are provided, for example, between the radiation guide body 16 and the disk 21, optionally in conjunction with the adhesive 22 . The dimensions of the covers 28 , 29 are to be adapted to the beam path to be expected. In the rotationally symmetrical embodiment of the rain sensor 10 shown in FIG. 2, in which the radiation reflector 13 is designed as a cone, the circular sensitive surface 32 being formed, the covers 28 , 29 are also expediently circular. In the case of angular housings 31 , which lead to an angular abutment 33 of the housing 31 on the pane 21 , a corresponding design of the covers 28 , 29 is provided.
Sowohl die Strahlungsquelle 11 als auch der Sensor 25 können an der Halterung 30 montiert sein, die gegen das Gehäuse 31 abgestützt ist. Die erforderlichen Abstützungen der Halterung 30 sind im Vergleich zu den Abmessungen der Strahlengänge gering und beeinträchtigen deshalb die optische Strahlung nur geringfügig.Both the radiation source 11 and the sensor 25 can be mounted on the holder 30 , which is supported against the housing 31 . The required supports of the holder 30 are small compared to the dimensions of the beam paths and therefore only slightly impair the optical radiation.
Aus Gründen der Materialersparnis kann der Strahlungsleitkörper 16 aufgeteilt sein in zwei separate Teile. 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. 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.To save material, the radiation guide body 16 can be divided into two separate parts. 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. The formation of the radiation guide body 16 as a single piece, which can be produced, for example, with a rotationally symmetrical structure of the rain sensor 10 as a turned part, can be less expensive than a two-part implementation.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE19904027367 DE4027367C1 (en) | 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 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19904027367 DE4027367C1 (en) | 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 |
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DE4027367C1 true DE4027367C1 (en) | 1991-07-04 |
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DE19904027367 Expired - Lifetime DE4027367C1 (en) | 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 |
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