CN112984462A

CN112984462A - Cover sheet system, for example for a motor vehicle headlight

Info

Publication number: CN112984462A
Application number: CN202011498519.9A
Authority: CN
Inventors: P·迈耶
Original assignee: ZKW Group GmbH
Current assignee: ZKW Group GmbH
Priority date: 2019-12-17
Filing date: 2020-12-17
Publication date: 2021-06-18
Anticipated expiration: 2040-12-17
Also published as: DE102019134823A1; CN112984462B

Abstract

The invention relates to a screen system for a motor vehicle headlight, or for a lighting device used for a motor vehicle headlight, or for a lighting device in a motor vehicle, or for a sensor device in a motor vehicle or in a motor vehicle headlight, wherein the system comprises a screen having an outer surface. Provision is made for a membrane to be arranged in at least one region of the outer face of the cover sheet, wherein the membrane is made of a deformable material such that in a first state it lies over the entire surface or at least in sections in at least one region at the outer face, and wherein at least one inlet opening is provided, via which compressed air of a compressed air device can be introduced between the membrane and the outer face such that the membrane can be brought into a second state in which it is at least partially lifted from the region of the outer face.

Description

Cover sheet system, for example for a motor vehicle headlight

Technical Field

The invention relates to a screen system for a motor vehicle headlight, or for a lighting device used for a motor vehicle headlight, or for a lighting device in a motor vehicle, or for a sensor device in a motor vehicle or in a motor vehicle headlight, wherein the system comprises a screen having an outer surface.

Background

In motor vehicle headlamps, in particular in cold seasons, the problem arises that ice or snow can form or accumulate on the cover sheet of the motor vehicle headlamp, which closes the motor vehicle headlamp towards the outside. The optical function of the headlight can thereby be influenced in that a light beam emitted by a lighting device, a light module or the like arranged in the headlight, for example in a housing of the headlight, is adversely influenced by ice or snow slush accumulating when passing through the covering sheet, for example in that at least a portion of the light is undesirably deflected and/or blocked, which can lead to a weakening of the light beam, the occurrence of undesirable scattering or the like.

The above-described covering flaps are sufficiently known in the construction of motor vehicle headlights, and typically relate to an optically transparent component which either has a flat structure or also at least partially has a structure which optically influences the light passing through the covering flap. In the latter case, the cover sheet is also referred to as a diffuser sheet, for example.

However, the problems described above can also occur in other optically transparent components, such as lenses, for example, projection lenses of lighting devices or light modules, if the optically transparent components are indirectly and directly subjected to environmental influences such that ice or snow slush can form or accumulate on the components. This often occurs when the member closes the lighting device or light module towards the surroundings.

Finally, when "optically transparent" is understood in the sense of "transparent to electromagnetic waves in the visible range", then the problems outlined above can be relevant not only in systems with optically transparent cover sheets but also in systems that emit and/or receive electromagnetic waves in the invisible wavelength range. For example, the covering sheet can relate to a covering for a radar and/or lidar sensor or the like.

In general, the term "cover sheet" is therefore understood in this context to mean each cover element which is at least partially or completely designed for the passage of electromagnetic radiation in the visible and/or invisible wavelength range and which closes the component which is to be covered therewith (vehicle headlight, light module or lighting device for motor vehicle headlight, sensor module, for example radar or lidar sensor, etc.) towards the surroundings, so that the outside of the cover sheet is indirectly and directly subjected to environmental influences.

In order to de-ice such cover sheets, thermodynamic solutions are currently used, which, however, require a long heating of the ice layer on the cover sheet. Furthermore, it is generally not optimally ensured that the optical properties of the cover sheet can be maintained by the introduction of thermal energy or that the influence on the electromagnetic radiation passing through is generally not adversely affected.

Disclosure of Invention

The object of the invention is to provide a solution by means of which ice can be removed at least partially, preferably completely, from the outside of the covering sheet.

The object is achieved by the cover sheet system mentioned at the outset in that according to the invention a membrane is provided in at least one region of the outer surface of the cover sheet, wherein the membrane is made of a deformable material such that in a first state the membrane lies over the entire surface or at least in sections in at least one region at the outer surface, and wherein at least one inlet opening is provided, via which compressed air of the compressed air device can be introduced between the membrane and the outer surface such that the membrane can be brought into a second state, in which the membrane is at least partially lifted from the region of the outer surface.

According to the invention, the ice layer is formed not on the covering sheet itself but on the film, so that by lifting the film from the covering sheet according to the invention, the ice is peeled off from the film and the film is accordingly partially or completely freed of the ice.

In this case, the membrane is preferably designed such that it moves back into the first state again after the introduced air has flowed out of the cavity between the cover sheet and the membrane.

In this case, it is particularly preferably provided that the film is only partially lifted off the covering sheet, so that a shape change of the film is caused by force, as a result of which the detaching effect of ice or other accumulations on the film, such as, for example, snow slush, is significantly increased. For example, the film bulges outwards when lifted from the cover sheet, thereby removing ice and/or mud.

It is preferably provided that the membrane is configured to be elastically deformable. It can thus be ensured that the membrane is at least partially lifted from the outside when compressed air is introduced between the membrane and the outside and moves back into the first state again after the air has been discharged/discharged.

It can be provided that the film is transparent, in particular in the visible wavelength range. Accordingly, the invention is then particularly suitable for use in combination with covering flaps of motor vehicle headlights or taillights or the like, through which light in the visible wavelength range must be able to pass during operation, or for all covering flaps in the sense of this document, through which visible light must be able to pass.

It can be provided that the region, against which the membrane rests in its first state, is formed by substantially the entire outer face of the cover sheet. Accordingly, it is possible to maximize the ability of the entire cover to ice or other build-up.

Alternatively, it can also be provided that the film is arranged only in regions which are provided for the passage of electromagnetic radiation, for example light.

It can furthermore be provided that the film is fixed at least in the first state of the film in one or more fixing sections at the outer side.

In this case, it can be provided that the film is permanently (i.e. also in the second state) fixed in one, more or all fixing sections. Accordingly, when compressed air is introduced, the film is lifted only in the region in which it is not permanently connected to the covering sheet.

Alternatively or additionally, it can be provided that the film can be detachably fixed in one or more fixing sections. For example, the film can be permanently fixed in certain regions, and in other regions it can be detachable, for example detachably bonded, so that when compressed air is introduced, the film is detached in these regions in the process, in order to be fixed again to the cover sheet when returning to the first state.

In this way, in the first state, the film lies as well as possible against the covering disk, and when compressed air is introduced, the film is largely detached temporarily from the covering disk, so that a large part of the film can be set free from ice or mud.

It can be provided that one or more fastening sections are located in the region in which the film lies against the cover sheet and/or that one or more fastening sections are located outside the region, or that all fastening sections are located in the region or that all fastening sections are located outside the region.

For example, it can be provided that the film is glued or welded to the cover sheet in the fastening section.

Preferably, it is provided that the compressed air device is designed to generate a pulsed or pulsating compressed air flow. The membrane is suddenly lifted by means of a preferably brief and in particular powerful air blast or air blasts, which leads to a reliable detachment of the ice or mud. Furthermore, in this case, the film does not have to bear absolutely sealingly against the cover sheet, since even in the event of an unsealed condition the film is lifted by a sudden compressed air surge (in particular if the air inflow is greater than the air outflow).

Lifting the film for a short time can also be preferred in the sense that the avoidance of ice formation can be adapted to the contour of the film.

Furthermore, it can advantageously be provided that the compressed air device has a compressed air source or a compressed air accumulator and a valve in at least one feed line from the compressed air source or the compressed air accumulator to the at least one inlet opening.

The compressed air supply can be controlled via the valve, preferably a controllable valve, so that in particular a release of the pressure surge can be achieved.

The valve can also be designed such that air introduced between the film and the cover sheet can flow out again via the inlet opening of the valve (which can be designed for this purpose, for example, as a two-way valve).

In addition or alternatively, one or more outlet openings can be provided in the film and/or in the cover sheet, respectively, so that the introduced air can flow out again. Preferably, such an outlet opening should form a sufficient resistance to the exiting air, so that a pressure build-up between the cover sheet and the membrane, in particular at least for a short time, is possible.

Preferably, detection means are provided, for example corresponding sensors, by means of which a contamination layer (Belag) on the film can be detected, and wherein activation means are provided which activate the compressed air device to emit one or more compressed air blows depending on the amount and/or nature of the detected contamination layer.

It is preferably provided that the activation means activates the compressed air device to emit one or more compressed air blows when the smear layer is or contains ice, in particular only when the smear layer is or contains ice.

For example, it is provided that at least one inlet opening is arranged in the cover sheet.

It can be provided that the compressed air device is part of the system or arranged externally with respect to the system.

The invention further relates to an assembly in the form of a motor vehicle headlight, in the form of a lighting device for a motor vehicle headlight, or in the form of a lighting device of a motor vehicle, or in the form of a sensor device in a motor vehicle or in a motor vehicle headlight, wherein the assembly comprises at least one system described above or is constructed in the form of such a system.

Finally, the invention also relates to a motor vehicle comprising the system described above or comprising at least one assembly as described above.

Drawings

The invention is explained in more detail below with reference to the drawings. In the drawings:

figure 1 shows a section through a cover sheet system according to the invention in a first state,

figure 2 shows the cover sheet system from figure 1 in a second state,

figure 3 shows schematically the fixing of the membrane at the cover sheet in cross section and in top view,

figure 4 schematically shows a further exemplary fixing of the film at the cover sheet in cross section and in top view,

figure 5 shows a motor vehicle with a cover sheet system according to the invention,

fig. 6 shows a motor vehicle with a further cover flap system according to the invention.

Detailed Description

Fig. 5 and 6 each show a motor vehicle 1000 having a motor vehicle headlight 100, wherein the motor vehicle headlight has a screen system 10 according to the invention or forms such a screen system.

Such a screen system 10 for a motor vehicle headlight 100 or in the form of a motor vehicle headlight is shown in detail in fig. 1 and 2. The system 10 comprises a cover 1 for a headlight 100, for example for a housing 111 (fig. 5, 6) of the headlight 100. The outer face of the cover sheet 1 is marked with the reference number 1'.

An elastically deformable film 2 is arranged in the region of the outer surface 1' of the cover sheet 1, wherein the material forming the film 2 is transparent, in particular in the visible wavelength range.

In the first state, the film 2 lies over the entire surface or at least in sections in the region of the outer surface 1', preferably over the entire outer surface 1', as is shown in fig. 1. An inlet opening 6 is provided in the cover sheet 1, through which compressed air from the

compressed air device

3, 4 can be introduced between the membrane 2 and the outer face 1'.

The compressed air device here comprises a compressed air reservoir/compressed air source 3 and a preferably controllable valve 4, so that compressed air, preferably in the form of one or more short compressed air pulses, can be introduced between the membrane 2 and the cover sheet 1 via the valve 4 in a controlled manner via a supply line 8 which opens into an inlet opening 6 in the cover sheet 2.

In fig. 1 it is schematically shown that an ice layer 5 has been formed on the film 2. The film 2 is now brought into a second state (fig. 2) by the introduction of compressed air, in which the film 2 is at least partially lifted from the outer face 1' so that the ice or ice layer peels off the film 2.

After the introduced air has flowed out of the cavity 9 between the cover sheet 1 and the membrane 2, the membrane 2 is moved back into the first state again (fig. 1).

The valve 4 can also be designed in such a way that air introduced between the film 2 and the cover sheet 1 via the inlet opening 6 and the valve, which is designed here as a two-way valve, for example, can flow out of the cavity 9 again.

According to fig. 1 and 2, the film is fixed in a fixing section 7 in the edge region of the cover sheet 1. For example, the securing section 7 extends along a portion of the edge of the cover sheet, preferably around the entire edge of the cover sheet. On the outer side 1', the film 2 in the first state lies between the preferably completely circumferential fastening sections 7. In the second state, the film 2 is connected in the fastening section 7 as before to the covering sheet 1 and is lifted from the outer side 1' in the region between them.

Fig. 3 (upper part) shows schematically, in a top view onto the cover sheet/film, such a situation described above, with a fastening section 7 consisting of two sections which essentially run almost completely along the edge. In the lower part of fig. 3, it is shown how, when compressed air 9 is introduced, the film 2 is lifted from the outer side 1' of the cover sheet 1 and essentially forms a large cavity 9.

Fig. 4 (upper part) shows schematically a further possibility, in which the fastening section 7 is formed by a tab at the edge section and three tabs on the cover sheet, so that an exemplary "comb-like" pattern results. In the lower part of fig. 4, it is shown how, when compressed air 9 is introduced, the film 2 is lifted from the outer side 1' of the cover sheet 1 and essentially forms a plurality of small interconnected cavities 9.

The film 2 can be glued or welded to the cover sheet 1 in the fastening section 7, for example.

Detection means are preferably provided, for example corresponding sensors, by means of which a contamination layer on the film 2 can be detected, and activation means are provided which activate the

compressed air devices

3, 4 for discharging one or more compressed air blows depending on the amount and nature of the detected contamination layer.

Returning to fig. 5 and 6, it can be seen that, according to fig. 5, the

compressed air device

3, 4 is part of the system 10 or of the motor vehicle headlight 100, while it is external with respect to the system 10/external with respect to the motor vehicle headlight 100 according to fig. 6 and represents a component of the motor vehicle 1000.

Claims

1. Cover sheet system (10) for a motor vehicle headlight (100), or for a lighting device used for a motor vehicle headlight, or for a lighting device in a motor vehicle (1000), or for a sensor device in a motor vehicle or in a motor vehicle headlight, wherein the system (10) comprises a cover sheet (1) having an outer face (1'),

it is characterized in that the preparation method is characterized in that,

a membrane (2) is arranged in at least one region of an outer surface (1 ') of the cover sheet (1), wherein the membrane (2) is made of a deformable material, such that in a first state the membrane (2) lies over the entire surface or at least in sections in at least one region at the outer surface (1'), and wherein at least one inlet opening (6) is provided, via which inlet opening (6) compressed air of a compressed air device (3, 4) can be introduced between the membrane (2) and the outer surface (1 '), such that the membrane (2) can be brought into a second state, in which the membrane (2) is at least partially lifted from the region of the outer surface (1').

2. The system according to claim 1, wherein the membrane (2) is configured elastically deformable.

3. The system according to claim 1 or 2, wherein the thin film is transparent, in particular in the visible wavelength range.

4. A system according to any one of claims 1 to 3, wherein the area against which the membrane (2) rests in its first state is substantially the entire exterior face (1') of the cover sheet.

5. System according to any one of claims 1 to 4, the membrane (2) being fixed in one or more fixing sections (7) at the outer side (1') at least in a first state of the membrane (2).

6. System according to claim 5, wherein the membrane (2) is permanently fixed in one, more or all fixing sections (7).

7. System according to claim 5 and/or 6, wherein the film (2) is releasably fixed in one or more fixing sections (7).

8. System according to one of claims 5 to 7, wherein one or more fixing sections (7) are located in the region in which the membrane (2) lies against the cover sheet (1') and/or one or more fixing sections are located outside the region, or all fixing sections (7) are located in the region or all fixing sections (7) are located outside the region.

9. System according to any one of claims 5 to 8, wherein the membrane (2) is glued or welded to the cover sheet (1) in the fixing section (7).

10. The system according to one of claims 1 to 9, wherein the compressed air device (3, 4) is set up for generating a pulsed or impact-shaped compressed air flow.

11. The system according to any one of claims 1 to 10, wherein the compressed air device (3, 4) has a compressed air source (3) or a compressed air reservoir (3) and a valve (4) in at least one delivery line (8) from the compressed air source (3) or the compressed air reservoir (3) to the at least one inlet opening (6).

12. System according to one of claims 1 to 11, wherein detection means are provided by means of which a contamination layer on the membrane (2) can be detected, and wherein activation means are provided which activate the compressed air device (3, 4) to emit one or more compressed air blows depending on the amount and/or nature of the detected contamination layer.

13. The system according to claim 12, said activating means activating said compressed air device (3, 4) to emit one or more compressed air blows when said contamination layer is or contains ice, in particular only when said contamination layer is or contains ice (5).

14. System according to any one of claims 1 to 13, wherein the at least one inlet opening (6) is arranged in the cover sheet (1).

15. System according to any one of claims 1 to 14, wherein the compressed air device (3, 4) is part of the system or arranged externally with respect to the system.

16. System according to one of claims 1 to 15, wherein the membrane (2) is configured such that it moves back into the first state again after the introduced air has flowed out of the cavity between the cover sheet and the membrane.

17. Assembly in the form of a motor vehicle headlight, in the form of a lighting device for a motor vehicle headlight, or in the form of a lighting device of a motor vehicle, or in the form of a sensor device in a motor vehicle or in a motor vehicle headlight, wherein the assembly comprises at least one system according to any one of claims 1 to 16 or is constructed in the form of a system according to any one of claims 1 to 16.

18. Motor vehicle comprising a system according to any of claims 1 to 16 or comprising at least one assembly according to claim 17.