DE102013213415A1 - Optical monitoring device for a motor vehicle, in particular a surveillance camera with an optically transparent cover - Google Patents

Abstract

The invention relates to an optical monitoring device for a motor vehicle, in particular a surveillance camera (2) with an optically transparent cover (4), a cleaning device (6, 6 ', 6' ') for cleaning the transparent cover (4) on demand, comprising a wiper ( 8, 8 ') which is arranged so as to be movable relative to the cover (4) and has a motor drive unit (10) for the purpose of relative movement.

Description

The invention relates to an optical monitoring device for a motor vehicle.

In motor vehicles, sensors are increasingly being installed today as assistance systems that assist the vehicle user when driving the vehicle. As assistance systems, for example, camera-based systems for optical monitoring of the vehicle environment are known as reversing and parking aids or as a lane departure warning system. Such assistance systems typically include a vehicle exterior mounted camera system for optically capturing and capturing the vehicle environment. The installation situation of the camera system here depends in particular on the intended assistance function; for example, camera systems for reversing aids are typically arranged in the area of the rear of the vehicle or the rear window of the vehicle. The image captured by the camera system can typically be displayed on a display in the vehicle cabin for the vehicle user.

To protect against contamination and external weather influences such camera systems are typically installed in a flap and can be manually or automatically unfolded or extended as needed to have a clear view of the monitored area to be detected. In particular, camera systems in the area of the front of the vehicle or the rear of the vehicle can be easily soiled when driving, for example by rain, snow, salt or dust, and thus restricted or prevented in their supporting function. In this case, the problem arises that such flaps today are easily used only in the range of low vehicle speed.

In the future, it is desirable that camera-based assistance systems can also be used at higher vehicle speeds in order, for example, to provide warning functions in the complete functional area of the vehicle. At higher speeds, the camera systems become more dirty, requiring frequent cleaning of the camera lenses during operation, which limits the availability of the assistance function.

Against this background, the invention has the object to provide an optical monitoring device for a motor vehicle, in which a simple and quick cleaning of the monitoring device is made possible even at high vehicle speeds.

The object is achieved according to the invention the features of claim 1. Advantageous embodiments and further developments are the subject of the dependent claims.

For this purpose, an optical monitoring device for a motor vehicle, in particular a surveillance camera with an optically transparent cover, comprises a cleaning device for cleaning the transparent cover as required, which comprises a wiper which is arranged relative to the cover for movement and has a motor drive unit for exercising the relative movement. The cover is designed as part of the optics of the surveillance camera, for example as a camera lens. The wiper is designed, for example, as a rubber lip or as a brush element. The surveillance camera is, for example, a reversing camera that is arranged in its intended position of installation in the area of the rear of the vehicle.

The monitoring device is constructed similar to the human eye, the wiper lidly by regular relative movements over the cover keeps the surveillance camera always clean. Thus, it is ensured in a structurally simple manner that the monitoring device is cleaned quickly and reliably even at high vehicle speeds and thereby occurring high pollution rates.

In a suitable embodiment, the monitoring device comprises, in particular, an electronic control unit which automatically activates the cleaning process, for example as a function of the contamination detectable by the camera image. The control unit is embodied, for example, as a microcontroller in which a control program automatically carrying out the cleaning method is implemented. Alternatively, however, it is also possible, for example, to use an application-specific integrated circuit (ASIC) to control the monitoring device.

The image captured by the monitoring device is typically displayed on a display in the vehicle cabin for the vehicle user, wherein the control unit is preferably designed such that, for example, in the image display, the shading due to a wiper movement during image processing is automatically hidden.

In a preferred embodiment, the wiper is arranged translationally movable to the cover. In particular, this is provided in a suitable embodiment that the drive unit in the manner of a threaded drive, rack drive, telescopic drive or belt drive is executed. As a result, a structurally particularly simple and robust drive technology is used to move the wiper. The translational back and forth movement is preferably caused in this embodiment by a reversal of a motor direction of rotation of the drive unit.

In a suitable alternative embodiment, the wiper is arranged rotatably movable to cover. For this purpose, it is provided in a preferred embodiment, in particular, that the drive unit is designed in the manner of a rotary-angle drive or a rotary drive. In this embodiment, an equally simple and robust drive technology is provided, wherein in particular with curved covers an improvement of the cleaning performance can be achieved.

With a curved cover, it is easier with a rotary movement allows the wiper contour to be adapted so that it is formed as complementary as possible to the cover. Thus, for example, a hemispherical wiper is conceivable, which is rotated by means of a geared motor in a rotational angle over a curved cover of the monitoring device. The rest position is preferably hidden outside of the cover and by a housing in this embodiment. In principle, a rotary wiper movable but also for use with flat covers conceivable.

In a particularly advantageous embodiment, the cover is movably arranged to the wiper. In this embodiment, it is possible, for example, that the wiper is fixedly arranged in contact with the cover, and the cover rotates under a cleaning process under the wiper. This advantageously makes it possible to easily arrange the wiper outside the camera field of view. Furthermore, this ensures that the wiper contact pressure during operation is uniform and constantly high.

For a particularly effective cleaning, both the wiper and the cover are movable in a preferred embodiment during a cleaning operation for carrying out the relative movement. In one possible embodiment, for example, during a cleaning process, the cover is set in rotation, a wiper being moved from a rest position into a cleaning position and pressed against the cover. After a cleaning process, the wiper is again moved to the rest position, which is preferably arranged outside the camera field of view.

In a suitable embodiment, the cover is formed bent. The cover is designed in particular as a component of the optics of the surveillance camera, for example as the camera lens, and / or arranged in front of the camera optics at least partially spherical protective surface. In principle, however, the protective surface can also be executed, for example.

In a preferred embodiment, the wiper is designed as a brush, an elastic wiper strip or with a number of wiper segments. As a result, the wiper is easily adaptable to the cover shape, which improves the cleaning performance.

In a particularly advantageous embodiment, the wiper has a number of spring elements, with which the wiper is deformable during cleaning in a complementary contour of the cover. As a result, a particularly uniform concern and a particularly uniform contact pressure of the wiper is ensured to the cover.

In an advantageous embodiment, the cleaning device comprises a moistening unit for the cover. In particular, it is provided in a suitable development that the moistening unit applies a cleaning solution to the cover, which can be wiped off with the wiper. The cleaning solution soothes soiling, which improves the subsequent cleaning performance of the wiper.

In a preferred additional or alternative embodiment, the cover is provided with a coating. The coating is preferably a dirt-repellent, scratch-resistant and / or hydrophobic protective layer on the cover surface.

An embodiment of the invention will be explained in more detail with reference to a drawing. In schematic and simplified representations:

1 in side view a monitoring device with a camera lens and designed as a threaded drive motor drive unit for a translatory movement of a wiper,

2 in side view the monitoring device with a telescopic drive for the wiper,

3 in side view, the monitoring device with a belt drive for the wiper,

4 in side view, the monitoring device with a rack drive for the wiper,

5 in plan view, the monitoring device with a arranged between an electric motor and the wiper connecting rod, and arranged in front of the camera lens glass,

6 in side view, the monitoring device according to 5 .

7 in plan view, the monitoring device with a designed as a rotary drive motor drive unit for a rotational movement of the wiper,

8th in plan view, the monitoring device with a rotary drive for the wiper,

9 in side view, the monitoring device with a rotary angle drive for the wiper and a rotation angle drive for the camera lens,

10 in side view, the monitoring device with a rotary angle drive for the wiper,

11 in plan view, the monitoring device according to 10 .

12 In plan view, the monitoring device with an alternative rotation angle drive for the wiper,

13 in side view, the monitoring device according to 12 .

14 in side view, the monitoring device with two wiper wheels, each with a rotary drive,

15 in side view the monitoring device with a rotatable glass pane and a fixed wiper,

16 in side view, the monitoring device with a rotatable camera lens and a fixed wiper,

17 in side view the monitoring device with a sponge as moistening unit, a rotatable camera lens and a fixed wiper,

18 in side view, the monitoring device with a translationally movable wiper drive and a rotationally movable camera lens,

19 in side view, the monitoring device with a number of executed as a brush brush wiper,

20 in side view of a wiper executed as a spring-loaded bending element in the pressed state to the camera lens,

21 in side view of the bending element according to 20 in the unpressed state,

22 in side view a wiper comprising a number of spring-loaded wiper elements,

23 in side view a wiper comprising a number of semicircular wiper elements,

24 in side view a rubber strip adapted to the camera lens contour as a wiper,

25 in side view, the monitoring device with the glass and a translatorisch movable wiper, and

26 in side view, the monitoring device with two extendable spray heads as humidification.

Corresponding parts and sizes are always provided with the same reference numerals in all figures.

In 1 is a security camera 2 with a camera lens 4 as an optical monitoring device for a motor vehicle with a cleaning device 6 on-demand cleaning Camera lens 4 shown. The cleaning device 6 essentially comprises a wiper 8th , which is relatively movable to the camera lens 4 is arranged and to exercise the relative movement of a coupled by means of a drive motor electric motor 10 having.

The camera lens 4 is an optically transparent convex cover and part of the optics of the surveillance camera 2 , The camera lens 4 stands in the manner of a spherical cap the housing of the surveillance camera 2 upwards over. At the security camera 2 in particular, it is a reversing camera, which is arranged in its intended position installation in the area of the rear of the vehicle.

In the figures, there are relative movements between the wiper 8th and the camera lens 4 symbolically visualized by means of arrows.

In the 1 to 6 is a number of different drive techniques for translational movement of the wiper 8th by means of the electric motor 10 over the camera lens 4 explained in more detail.

In 1 is a first embodiment of the drive as a threaded drive 12 shown in which the electric motor 10 via a gear transmission 14 a threaded rod 16 drives. The rotating threaded rod 16 translationally moves a threaded nut 18 that with a push rod 20 and the wiper 8th is coupled. Moving the wiper back 8th is realized by means of a reversal of the motor direction.

Based on 2 is a second embodiment of the drive as a telescopic drive 22 explained in more detail. In this version pushes the electric motor 10 via an eccentric 24 a rope 26 connected to a number of telescope sleeves 28 coupled with those of the wiper 8th is translationally movable.

In 3 is a third embodiment of the drive as a belt drive 30 shown. The belt drive 30 essentially comprises a belt-like belt 32 in four corner areas about rectangular to the surveillance camera 2 around by means of bearings 34 is stored. One of the camps 34 is with the electric motor 10 for moving the belt 32 coupled. The wiper 8th in this embodiment is on the lens side on the belt 32 attached and will be at a rotation of the electric motor 10 translatorily over the camera lens 4 emotional.

In 4 is a fourth embodiment of the drive as a rack and pinion drive 36 explained in more detail. In this embodiment, a drive pinion engages 38 of the electric motor 10 in a rack 40 one to which the wiper 8th is attached and translatable through the camera lens 4 is movable.

In 5 and 6 is a fifth embodiment of the drive for translational movement of the wiper 8th shown. In this version is a flat glass 42 as a protective surface in front of the camera lens 4 arranged. In this embodiment, only the glass pane 42 from the wiper 8th cleaned.

The glass pane 42 is coated with a dirt-repellent and scratch-resistant protective layer on the glass pane surface. The security camera 2 and the electric motor 10 are in a common housing 44 arranged, with the wiper 8th in a rest position within the housing 44 is sunk and only during a cleaning process on the glass 42 is moved.

The electric motor 10 is by means of an eccentric 24 ' and a connecting rod 46 centered on the elongated wiper 8th coupled. The connecting rod 46 and the wiper 8th are essentially T-shaped, with the connecting rod 46 the vertical T-leg, and the wiper 8th forms the horizontal T-leg. The wiper 8th in this embodiment is an elongate rubber lip that is approximately sized so that it extends substantially the entire width of the glass sheet 42 extends.

In the 7 to 14 is a number of different drive techniques for a rotary motion of the wiper 8th by means of the electric motor 10 over the camera lens 4 explained in more detail.

Based on 7 is a first embodiment of the drive as a rotary-angle drive 48 explained in more detail. In this embodiment, the wiper 8th rotatory between two rest positions at a predefined angle over the camera lens 4 emotional. This is a transmission 50 provided, which by means of eccentric and push rods the wiper 8th with the electric motor 10 coupled.

In the 8th is a second embodiment of the drive as a rotary drive 52 shown. The rotary drive 52 essentially comprises a motor pinion 54 of the electric motor 10 which with a big gear 56 is coupled drive technology. The gear 56 is slightly wider in diameter than the surveillance camera 2 sized and rotatable around the camera lens 4 stored around. The wiper 8th is in this embodiment radially on the gear 56 attached and dimensioned so that it is approximately in the middle of the camera lens 4 ends. At a motor rotation of the electric motor 10 becomes the motor pinion 54 rotated and by means of the gear ratio, the large gear 56 rotated, leaving the wiper 8th Rotatory around the fixed camera lens 4 is moved around. Additionally or alternatively, it is provided that the wiper 8th can also be folded away into a rest position, so that the field of view of the camera lens 4 not affected during operation.

In the 9 a third embodiment of the drive is shown, in which both the wiper 8th as well as the camera lens 4 by means of the rotary angle drive 48 ' are movable. In addition to the wiper 8th is a sponge soaked in cleaning solution 58 as part of the cleaning device 6 arranged. The sponge 58 is in contact with the camera lens 4 brought so that with a rotation of the camera lens 4 Cleaning solution is applied, then with the wiper 8th is wipeable. The sponge 58 has one of the camera lens 4 complementary contour on, so the surface of the camera lens 4 as evenly as possible wetted with the cleaning solution. The cleaning solution soothes soiling, which reduces the subsequent cleaning performance of the wiper 8th is improved.

The rotation angle drive 48 ' the cleaning device 6 is constructed in two stages, in case of rain or small, easily soluble dirt turns the wiper designed as a bow wiper 8th over the camera lens 4 and removes the pollution or rain. For heavier soiling, the camera lens rotates 4 with the security camera 2 by means of a joint 60 about 90 °, so the camera lens 4 in contact with the sponge 58 is brought. The cleaning solution is applied to the lens surface, then the camera lens 2 pivoted to the starting position and the wiper 8th emotional.

In the 10 and 11 is a fourth embodiment of the drive as a rotary angle drive 48 '' shown. In this version, one turns with the electric motor 10 coupled gearbox 62 the approximately hemispherical running wiper 8th around the spherical axis of the convex camera lens 4 , The wiper 8th is this on an arc-like bracket 64 fastened in one piece to the gearbox 62 adjoined. The resting position of the wiper 8th is selected to be outside the lens field of view and to protect the wiper 8th is covered by a housing.

In the 12 and 13 is an alternative embodiment of the fourth embodiment of the drive as a rotary-angle drive 48 '' shown. In this embodiment, the electric motor 10 by means of the eccentric 24 '' and the connecting rod 46 with the gearbox 62 ' for moving the approximately hemispherical running wiper 8th coupled.

Based on 14 is a fifth embodiment of the drive as a rotary drive 52 ' explained in more detail. In this embodiment, two wipers are designed as rotatable wiper wheels 8th' provided by means of sheet holders 66 during a cleaning operation on the camera lens are pivotable. The wiper 8th' In this embodiment, a number of radially oriented wiping brushes or wiping cloths cover the camera lens 4 are rotatable.

In this embodiment, at the beginning of a cleaning process, the sheet holders 66 swung in, then the wipers 8th' set in rotation. Next are the bow holders 66 pivoted back to its rest position and finally stopped the wiper rotation.

In the 15 an embodiment of the drive is shown, in which the wiper 8th is fixed, and the rotatably mounted glass 42 ' by means of the rotary drive 52 '' under the wiper 8th is turned away. This is the approximately circular glass 42 ' by means of a gearbox 68 rotates. The diameter of the glass pane 42 ' is about the sum of the width of the camera lens 4 and the width of the wiper running as a wiper strip 8th , The security camera 2 is under a half side of the glass pane 42 ' arranged, the electric motor 10 is on the neighboring half side together with the security camera 2 arranged. The wiper 8th is essentially above the electric motor 10 arranged and radial to the glass pane 42 ' oriented. In this embodiment, the wiper 8th always outside the camera field of view, continues to be a uniform and constant contact pressure of the wiper 8th on the glass pane 42 ' ensured.

Based on 16 is a variant of the drive explained in more detail, in which the camera lens 4 by means of the rotary angle drive 48 ''' on the wiper 8th is pivoted past. This embodiment is similar to the embodiment in FIG 9 but without the sponge 58 , continues to be the wiper 8th stationary and in constant contact with the lens surface. The surveillance camera is used for cleaning 2 by means of a joint 60 pivoted by about 90 °, here is the surface of the camera lens 4 on the wiper 8th past. Subsequently, the surveillance camera 2 swung back with the camera lens 4 a second time on the wiper 8th is passed and thereby cleaned of dirt.

The in the 17 illustrated embodiment is essentially a combination of the variants in 9 and 16 , The rotation angle drive 48 '''' the security camera swivels 2 during a cleaning process on the fixed rubber lip of the in with the camera lens 4 in contact with the wiper 8th past the sponge soaked in cleaning solution 58 , Subsequently, the surveillance camera 2 pivoted back, with the cleaning solution and dirt on the second pass on the wiper 8th be wiped away by these.

In the 18 is an embodiment of the cleaning device 6 ' shown in the case of a cleaning process, the wiper 8th from a wiper drive not shown in translation to the surveillance camera 2 is moved while the camera lens 4 rotational about the axial direction of the surveillance camera 2 rotates. The wiper 8th In this embodiment, it has an approximately quarter-circle-like contour, which is conclusively radial to the contour of the camera lens 4 can be pressed.

Based on 19 to 25 Below is a number of different wiper variants explained in more detail.

In the 19 shown wiper variant is as a number of brushes 70 . 70 ' executed. The brush brush 70 is for the purpose of a cleaning process from a rest position frontal on the camera lens 4 pivotable. Laterally next to the Security Camera 2 are two lateral brushes 70 ' arranged for cleaning out of the case 44 can be moved out. The brushes 70 . 70 ' rotate during operation and remove by abrasion dirt on the lens surface. Alternatively, it is also conceivable to use brushes to protect the lens surface from scratching.

In 20 and 21 is a wiper variant in the manner of a prestressed bending element 72 shown. In this embodiment, the bending element 72 essentially an elongated elastic rubber lip 74 , by means of two frontally arranged springs 76 at a wiping trowel 78 is attached. As in 21 is recognizable, the rubber lip 74 by means of the springs 76 held on tension, leaving the rubber lip 74 approximately parallel to the wiper trowel 78 is arranged. The acting spring forces are chosen such that they are parallel to the rubber lip 74 oriented and directed to the outside. For cleaning, the bending element 72 to the camera lens 4 pressed, with the rubber lip 74 due to the spring forces always good on the spherical surface of the camera lens 4 adapts.

In 22 there is shown a wiper variant comprising a number of individual wiping elements 80 includes, which in versions 82 a wiper housing 84 are arranged. The wiping elements 80 protrude at least partially from the versions 82 out and are arranged approximately in a semicircle. For improved adaptation to the lens curvature, the wiping elements 80 on the front side springs 76 ' on, whose spring force directed outward along the wiper elements 80 to the camera lens 4 are directed. By the springs 76 ' are the wiping elements 80 stretched with a predefined contact pressure, so that they rest evenly on the lens contour during a cleaning process. By way of example only a wiping element is shown in the figures 80 , a version 82 and a spring 76 ' provided with a reference numeral.

In the 23 illustrated embodiment is substantially identical to 22 , wherein the wiping elements 80 no feathers 76 ' and wherein the wiping elements 80 Dovetailed form-fitting on the wiper housing 84 are clamped.

In 24 is a variant with a curved wiper rubber 86 shown. The radius of curvature R of the wiper blade is particularly chosen such that it coincides with the radius of curvature of the camera lens 4 matches, so that the wiper rubber 86 As evenly and conclusively rests against the lens surface. In this embodiment, the wiper rubber is 86 fixed and the security camera 2 gets under the wiper rubber 86 pivoted through.

The in 24 illustrated wiper 8th wipes like that 5 and 6 translatory over the above the camera lens 4 arranged glass pane 42 ,

Based on 25 is finally an embodiment of the cleaning device 6 '' explained in more detail at the two spray nozzles 86 are provided for wetting and cleaning the lens surface with cleaning solution. The spray nozzles 86 each have an extendable spray head 88 up, coming from a resting position inside the housing 44 out is movable. When extended, the spray heads protrude 88 something about the camera lens 4 and spray the cleaning solution obliquely downwards onto the camera lens 4 ,

The spray head 88 is to a pump 90 coupled by means of a valve 92 between a container 94 with cleaning solution and a compressed air supply 96 can switch as a reservoir. For cleaning, first cleaning solution by means of the pump 90 from the container 94 removed and with the spray head 88 on the camera lens 4 applied. Then the valve switches 92 on the compressed air duct, with compressed air from the compressed air supply 96 over a filter 98 to the pump 90 flows. The resulting air flow of the spray head 88 blows the cleaning solution together with the dirt dissolved in it from the surface of the camera lens 2 , Then the valve closes 92 the airflow and the spray heads 88 will be back in the case 44 method. Through the filter 98 Ensures that no impurities in the compressed air, such as oily residues in compressed air or dust particles, on the camera lens 4 be applied.

The invention is not limited to the embodiments described above. On the contrary, other variants of the invention can be derived therefrom by the person skilled in the art without departing from the subject matter of the invention. In particular, furthermore, all individual features described in connection with the various exemplary embodiments can also be combined with one another in other ways, without departing from the subject matter of the invention.

LIST OF REFERENCE NUMBERS

2

Security Camera

4

camera lens

6, 6 ', 6' '

cleaning device

8, 8 '

wiper

10

electric motor

12

threaded drive

14

gear transmission

16

threaded rod

18

threaded nut

20

pushrod

22

telescopic drive

24, 24 ', 24' '

eccentric

26

rope

28

telescopic sleeve

30

belt drive

32

belt

34

camp

36

Rack and pinion drive

38

pinion

40

rack

42, 42 '

pane

44

casing

46, 46 '

connecting rod

48, 48 ', 48' ', 48' '', 48 '' ''

Rotation angle drive

50

transmission

52, 52 ', 52' '

rotary drive

54

pinion

56

gear

58

sponge

60

joint

62

transmission

64

bracket

66

arch support

68

transmission

70, 70 '

brush brush

72

flexure

74

rubber lip

76, 76 '

feather

78

wipe trowel

80

wiping element

82

version

84

wiper housing

86

spray nozzle

88

spray nozzle

90

pump

92

Valve

94

container

96

Air Supply

98

filter

Claims (13)

Optical monitoring device for a motor vehicle, in particular a surveillance camera ( 2 ) with an optically transparent cover ( 4 ), wherein a cleaning device ( 6 . 6 ' . 6 '' ) for cleaning the transparent cover as required ( 4 ), which is a wiper ( 8th . 8th' ) which is movable relative to the cover ( 4 ) is arranged and to exercise the relative movement of a motor drive unit ( 10 ) is trained. Optical monitoring device according to claim 1, characterized in that the wiper ( 8th . 8th' ) translationally movable to the cover ( 4 ) is arranged. Optical monitoring device according to claim 2, characterized in that the drive unit ( 10 ) in the manner of a thread drive ( 12 ) Rack drive ( 36 ), Telescopic drive ( 28 ) or belt drive ( 32 ) is executed. Optical monitoring device according to claim 1, characterized in that the wiper ( 8th . 8th' ) Rotationally movable to the cover ( 4 ) is arranged. Optical monitoring device according to claim 4, characterized in that the drive unit ( 10 ) in the manner of a rotary angle drive ( 48 . 48 ' . 48 '' . 48 ''' . 48 '''' ) or a rotary drive ( 52 . 52 ' . 52 '' ) is executed. Optical monitoring device according to one of claims 1 to 5, characterized in that the cover ( 4 ) movable to the wiper ( 8th . 8th' ) is arranged Optical monitoring device according to one of claims 1 to 6, characterized in that during a cleaning process, both the wiper ( 8th . 8th' ) as well as the cover ( 4 ) are movable to perform the relative movement. Optical monitoring device according to one of claims 1 to 7, characterized in that the cover ( 4 ) is bent. Optical monitoring device according to one of claims 1 to 8, characterized in that the wiper ( 8th ) as a brush ( 70 . 70 ' ), an elastic wiper strip ( 72 . 74 ) or with a number of wiping segments ( 80 ) is executed. Optical monitoring device according to one of claims 1 to 9, characterized in that the wiper ( 8th ) a number of spring elements ( 76 . 76 ' ), with which the wiper ( 8th ) when cleaning in one of the covers ( 4 ) complementary contour is deformable. Optical monitoring device according to one of claims 1 to 10, characterized in that the cleaning device ( 6 . 6 '' ) a moistening unit ( 58 . 86 ) for the cover ( 4 ). Optical monitoring device according to one of claims 1 to 11, characterized in that the moistening unit ( 54 . 86 ) a cleaning solution on the cover ( 4 ), with the wiper ( 8th ) is wipeable. Optical monitoring device according to one of claims 1 to 11, characterized characterized in that the cover ( 4 ) is provided with a coating.

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