EP3581848B1 - Automotive lighting device - Google Patents
Automotive lighting device Download PDFInfo
- Publication number
- EP3581848B1 EP3581848B1 EP18382421.8A EP18382421A EP3581848B1 EP 3581848 B1 EP3581848 B1 EP 3581848B1 EP 18382421 A EP18382421 A EP 18382421A EP 3581848 B1 EP3581848 B1 EP 3581848B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lighting device
- automotive lighting
- opaque
- outer glass
- opaque element
- 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.)
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Links
- 239000011521 glass Substances 0.000 claims description 24
- 239000011148 porous material Substances 0.000 claims description 22
- 238000009423 ventilation Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 230000002209 hydrophobic effect Effects 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000008262 pumice Substances 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 230000003075 superhydrophobic effect Effects 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/30—Ventilation or drainage of lighting devices
- F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/50—Waterproofing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
Definitions
- the present invention belongs to the field of lamps for automotive vehicles, and more specifically, to the design of headlamps to avoid fogging in the outer glass.
- the permeable element is opaque enough to avoid light leakage, but offers an easier path for the dry flow to reach the glass and avoid misting. Hence, both problems are satisfactorily solved with a solution which is simple and inexpensive.
- the permeable element comprises a valve
- a valve is a suitable solution for a permeable material as defined in the present invention, since it allows water vapour to pass through but does not allow light to pass through.
- the permeable element comprises a porous material.
- a porous material is a suitable solution for a permeable material as defined in the present invention, since it allows water vapour to pass through but does not allow light to pass through.
- the whole opaque element is made of a porous material.
- these embodiments include a porous material that is able to resist loads.
- the main part of the opaque element is made of a solid material and only the second portion is made of a porous material, in order to avoid loads on this second portion.
- the first portion of the opaque element is made of plastic injection with a pore generation process. In other embodiments, the first portion of the opaque element is manufactured out of a sintering process
- the porous material is one of PTFE, pumice stone or a textile material.
- At least a portion of the opaque element is located less than 5cm from the outer glass.
- the opaque element is a bezel. In other embodiments, the opaque element is a harness cover. These are common elements in a lighting device, and are close enough to the glass so that the porosity of the first portion has a positive impact in the path of the dry flow.
- the lighting device further comprises a deflector arranged to direct an airflow from the ventilation element to the first portion of the opaque element.
- This deflector makes still easier the path of the dry flow from the ventilation element comprised in the housing and the glass which is intended to be demisted.
- the first portion has a hydrophobic or super-hydrophobic surface treatment.
- the internal face of the outer glass has an anti-mist surface treatment.
- This anti-mist treatment is also helpful to cooperate with the dry current in achieving the demisting of the glass surface.
- the light source is a solid-state light source.
- solid state refers to light emitted by solid-state electroluminescence, which uses semiconductors to convert electricity into light. Compared to incandescent lighting, solid state lighting creates visible light with reduced heat generation and less energy dissipation.
- the typically small mass of a solid-state electronic lighting device provides for greater resistance to shock and vibration compared to brittle glass tubes/bulbs and long, thin filament wires. They also eliminate filament evaporation, potentially increasing the life span of the illumination device.
- Some examples of these types of lighting comprise semiconductor light-emitting diodes (LEDs), organic light-emitting diodes (OLED), or polymer light-emitting diodes (PLED) as sources of illumination rather than electrical filaments, plasma or gas.
- FIG. 1 shows a scheme of an automotive lighting device 101 according to the state of the art.
- This lighting device comprises the following elements:
- FIG. 1 shows an automotive lighting device 1 according to the invention.
- This lighting device 1 comprises
- the opaque element 6 is a bezel, which is located between 1cm and 5cm from the outer glass.
- This bezel 6 comprises a first portion 7 which is made of a porous material.
- the location of this first portion 7 is optimum to provide the dry current the fastest path 8 to reach the outer glass.
- the path 8 of the lighting device of the invention is much more straightforward than the path 107 followed by the dry flow in the lighting devices of the state of the art.
- the bezel 6 is made of a plastic injection material, where the first portion 7 is subject to a pore formation process.
- the rest of the bezel keeps its original structure, so that it may resist loads, while the first portion is made porous to provide the advantageous feature to the lighting device.
- the porous material has a hydrophobic surface treatment, to avoid humidity being stored in the pores.
- Figure 3 shows an even more efficient lighting device 1 according to the invention.
- This embodiment comprises all the elements of the embodiment shown in the preceding figure and also comprises a deflector 9 arranged to direct the dry flow from the ventilation element 4 to the first portion 7 of the opaque element 6.
- This deflector is arranged in contact with a zone of the housing which is close to the ventilation element, and limits the path for the dry flow so that it reaches the first portion 7 sooner.
- the first portion 7 of the opaque element 6 is smaller, since the deflector 9 directs the flow towards the particular first portion, and the rest of the bezel does not receive the dry flow.
- the deflector 9 directs the flow towards the particular first portion, and the rest of the bezel does not receive the dry flow.
- Figure 4 shows a lighting device 1 according to the invention installed in an automotive vehicle 100.
- This automotive vehicle 100 will have their headlamps easily demisted without using particular and expensive active elements. There is no need to force any current, since the particularly advantageous structure of the lighting device 1 according to the invention is enough to cause demisting in a faster way than in the headlamps which are known in the state of the art.
- the bezel 6 is usually seen, but the first portion is not seen in this figure. Since solid plastic materials are aesthetically preferred to porous materials, this feature turns out to be advantageous.
Description
- The present invention belongs to the field of lamps for automotive vehicles, and more specifically, to the design of headlamps to avoid fogging in the outer glass.
- Current headlamps have to fulfil different requirements which sometimes involve contradictory design paths. One example of this is related to demisting problems.
- Misting is caused when water vapour condenses on the internal surface of a glass. Micro-drops are unaesthetic and affect the light behaviour, so great efforts are put to solve this problem. However, in order to design modern and efficient lighting devices, walls of opaque materials must surround the light source, to avoid light leakage. But these opaque walls are an obstacle for a free path of dry air to reach the glass surface and avoid condensation.
-
US 2006/150817 A1 ,EP 3 222 339 A1DE 10 2013 200468 A1 disclose automotive lighting devices of the prior art. - Hence, the better a solution is for avoiding light leakage, the worse for avoiding glass condensation because these opaque walls create a tortuous defogging air path that will have a very low flow rate and, consequently, a very slow defogging velocity.
- The invention provides a solution for this problem by the provision of an automotive lighting device according to
claim 1. Preferred embodiments of the invention are defined in dependent claims. - Unless otherwise defined, all terms (including technical and scientific terms) used herein are to be interpreted as is customary in the art. It will be further understood that terms in common usage should also be interpreted as is customary in the relevant art and not in an idealised or overly formal sense unless expressly so defined herein.
- In this text, the term "comprises" and its derivations (such as "comprising", etc.) should not be understood in an excluding sense, that is, these terms should not be interpreted as excluding the possibility that what is described and defined may include further elements, steps, etc.
- The permeable element is opaque enough to avoid light leakage, but offers an easier path for the dry flow to reach the glass and avoid misting. Hence, both problems are satisfactorily solved with a solution which is simple and inexpensive.
- In some particular embodiments, the permeable element comprises a valve.
- A valve is a suitable solution for a permeable material as defined in the present invention, since it allows water vapour to pass through but does not allow light to pass through.
- In some particular embodiments, the permeable element comprises a porous material.
- A porous material is a suitable solution for a permeable material as defined in the present invention, since it allows water vapour to pass through but does not allow light to pass through.
- In some particular embodiments, the whole opaque element is made of a porous material. These embodiments include a porous material that is able to resist loads. In other embodiments, the main part of the opaque element is made of a solid material and only the second portion is made of a porous material, in order to avoid loads on this second portion.
- In some particular embodiments, the first portion of the opaque element is made of plastic injection with a pore generation process. In other embodiments, the first portion of the opaque element is manufactured out of a sintering process
- These are suitable ways of obtaining a porous material from well-known manufacturing processes and inexpensive materials.
- In some particular embodiments, the porous material is one of PTFE, pumice stone or a textile material.
- These materials have proved to be suitable for this invention, since they provide a good pore size and good mechanical properties.
- In a particular embodiment, at least a portion of the opaque element is located less than 5cm from the outer glass.
- Such an arrangement helps to define a straightforward path for the dry current, and is very useful in current designs where size is growing smaller. In some embodiments, this portion of the opaque element could even touch the outer glass.
- In some particular embodiments, the opaque element is a bezel. In other embodiments, the opaque element is a harness cover. These are common elements in a lighting device, and are close enough to the glass so that the porosity of the first portion has a positive impact in the path of the dry flow.
- In some particular embodiments, the lighting device further comprises a deflector arranged to direct an airflow from the ventilation element to the first portion of the opaque element.
- This deflector makes still easier the path of the dry flow from the ventilation element comprised in the housing and the glass which is intended to be demisted.
- In some particular embodiments, the first portion has a hydrophobic or super-hydrophobic surface treatment.
- These treatments are useful since, otherwise, the pores would become a humidity store, and the dry current would become a wet current when crossing the porous material, thus losing the demisting properties.
- In some particular embodiments, the internal face of the outer glass has an anti-mist surface treatment.
- This anti-mist treatment is also helpful to cooperate with the dry current in achieving the demisting of the glass surface.
- In some particular embodiments, the light source is a solid-state light source.
- The term "solid state" refers to light emitted by solid-state electroluminescence, which uses semiconductors to convert electricity into light. Compared to incandescent lighting, solid state lighting creates visible light with reduced heat generation and less energy dissipation. The typically small mass of a solid-state electronic lighting device provides for greater resistance to shock and vibration compared to brittle glass tubes/bulbs and long, thin filament wires. They also eliminate filament evaporation, potentially increasing the life span of the illumination device. Some examples of these types of lighting comprise semiconductor light-emitting diodes (LEDs), organic light-emitting diodes (OLED), or polymer light-emitting diodes (PLED) as sources of illumination rather than electrical filaments, plasma or gas.
- To complete the description and in order to provide for a better understanding of the invention, a set of drawings is provided. Said drawings form an integral part of the description and illustrate an embodiment of the invention, which should not be interpreted as restricting the scope of the invention, but just as an example of how the invention can be carried out. The drawings comprise the following figures:
-
Figure 1 shows a scheme of an automotive lighting device according to the state of the art. -
Figure 2 shows a scheme of a particular embodiment of an automotive lighting device according to the invention. -
Figure 3 shows a scheme of a different embodiment of an automotive lighting device according to the invention. -
Figure 4 shows a lighting device according to a particular embodiment of the invention installed in an automotive vehicle. - The example embodiments are described in sufficient detail to enable those of ordinary skill in the art to embody and implement the systems and processes herein described. It is important to understand that embodiments can be provided in many alternate forms and should not be construed as limited to the examples set forth herein.
- Accordingly, while embodiment can be modified in various ways and take on various alternative forms, specific embodiments thereof are shown in the drawings and described in detail below as examples. There is no intent to limit to the particular forms disclosed. On the contrary, all modifications, equivalents, and alternatives falling within the scope of the appended claims should be included. Elements of the example embodiments are consistently denoted by the same reference numerals throughout the drawings and detailed description where appropriate.
-
Figure 1 shows a scheme of anautomotive lighting device 101 according to the state of the art. This lighting device comprises the following elements: - a
light source 102 intended to emit light; - a
housing 103 comprising aventilation element 104, configured to allow water vapour to pass through but does not allow liquid water to enter the housing; - an
outer glass 105, arranged to close thehousing 103; - an
opaque element 106 located between thelight source 102 and theouter glass 105, intended to avoid light leakage. - In this
lighting device 101 the dry path which comes from theventilation element 104 follows atortuous path 107 from this ventilation element until reaching theouter glass 105. -
Figure 2 shows anautomotive lighting device 1 according to the invention. Thislighting device 1 comprises - a solid-state light source, such as a
LED 2 intended to emit light; - a
housing 3 comprising aventilation element 4, configured to allow water vapour to pass through but does not allow liquid water to enter the housing; - an
outer glass 5, arranged to close the housing; - an
opaque element 6 with afirst portion 7 located between thelight source 2 and theouter glass 5, wherein thefirst portion 7 is made of a porous material which allows water vapour to pass through but does not allow light to pass through. - In the particular embodiment shown in this figure, the
opaque element 6 is a bezel, which is located between 1cm and 5cm from the outer glass. - This
bezel 6 comprises afirst portion 7 which is made of a porous material. The location of thisfirst portion 7 is optimum to provide the dry current thefastest path 8 to reach the outer glass. As may be seen from the comparison ofFigures 1 and 2 , thepath 8 of the lighting device of the invention is much more straightforward than thepath 107 followed by the dry flow in the lighting devices of the state of the art. - The
bezel 6 is made of a plastic injection material, where thefirst portion 7 is subject to a pore formation process. The rest of the bezel keeps its original structure, so that it may resist loads, while the first portion is made porous to provide the advantageous feature to the lighting device. Further, the porous material has a hydrophobic surface treatment, to avoid humidity being stored in the pores. -
Figure 3 shows an even moreefficient lighting device 1 according to the invention. This embodiment comprises all the elements of the embodiment shown in the preceding figure and also comprises adeflector 9 arranged to direct the dry flow from theventilation element 4 to thefirst portion 7 of theopaque element 6. This deflector is arranged in contact with a zone of the housing which is close to the ventilation element, and limits the path for the dry flow so that it reaches thefirst portion 7 sooner. - In this embodiment, the
first portion 7 of theopaque element 6 is smaller, since thedeflector 9 directs the flow towards the particular first portion, and the rest of the bezel does not receive the dry flow. As a consequence, there is no need to arrange such a big first portion as in the preceding example. This has a positive outcome in the mechanical properties of the final bezel, since the porous materials have, in general, poorer mechanical properties than solid materials. -
Figure 4 shows alighting device 1 according to the invention installed in anautomotive vehicle 100. - This
automotive vehicle 100 will have their headlamps easily demisted without using particular and expensive active elements. There is no need to force any current, since the particularly advantageous structure of thelighting device 1 according to the invention is enough to cause demisting in a faster way than in the headlamps which are known in the state of the art. - The
bezel 6 is usually seen, but the first portion is not seen in this figure. Since solid plastic materials are aesthetically preferred to porous materials, this feature turns out to be advantageous.
Claims (14)
- Automotive lighting device (1) comprisinga light source (2) intended to emit light;a housing (3) comprising a ventilation element (4), which allows water vapour to pass through while preventing liquid water from entering the housing;an outer glass (5), arranged to close the housing (2); an opaque element (6) with a first portion (7) located between the ventilation element (4) and the outer glass (5), characterized in thatthe first portion (7) comprises a permeable element which allows water vapour to pass through and which does not allow light to pass through and wherein the first portion (7) is located such that a dry air current from the ventilation element (4) reaches the outer glass (8)
- Automotive lighting device (1) according to claim 1, wherein the permeable element comprises a valve.
- Automotive lighting device (1) according to any of the preceding claims, wherein the permeable element comprises a porous material.
- Automotive lighting device (1) according to claim 3, wherein the whole opaque element is made of a porous material.
- Automotive lighting device (1) according to any of claims 3 or 4, wherein the first portion of the opaque element is made of plastic injection with a pore generation process.
- Automotive lighting device (1) according to any of claims 3 or 4, wherein the first portion of the opaque element is manufactured out of a sintering process.
- Automotive lighting device (1) according to any of claims 3 to 6, wherein the porous material is one of PTFE, pumice stone or a textile material.
- Automotive lighting device (1) according to any of the preceding claims, wherein at least a portion of the opaque element is located less than 5cm from the outer glass.
- Automotive lighting device (1) according to any of the preceding claims, wherein the opaque element is a bezel.
- Automotive lighting device (1) according to any of the preceding claims, wherein the opaque element is a harness cover.
- Automotive lighting device (1) according to any of the preceding claims, wherein the lighting device further comprises a deflector arranged to direct an airflow from the ventilation element to the first portion of the opaque element.
- Automotive lighting device (1) according to any of the preceding claims, wherein the first portion has a hydrophobic or super-hydrophobic surface treatment.
- Automotive lighting device (1) according to any of the preceding claims, wherein the internal face of the outer glass has an anti-mist surface treatment.
- Automotive lighting device (1) according to any of the preceding claims, wherein the light source is a solid-state light source.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18382421.8A EP3581848B1 (en) | 2018-06-13 | 2018-06-13 | Automotive lighting device |
CN201910495862.9A CN110594697B (en) | 2018-06-13 | 2019-06-06 | Automobile lighting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18382421.8A EP3581848B1 (en) | 2018-06-13 | 2018-06-13 | Automotive lighting device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3581848A1 EP3581848A1 (en) | 2019-12-18 |
EP3581848B1 true EP3581848B1 (en) | 2022-05-11 |
Family
ID=62716022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18382421.8A Active EP3581848B1 (en) | 2018-06-13 | 2018-06-13 | Automotive lighting device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3581848B1 (en) |
CN (1) | CN110594697B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3139182A1 (en) * | 2022-08-30 | 2024-03-01 | Psa Automobiles Sa | Motor vehicle headlight with optimized ventilation |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000260208A (en) * | 1999-03-10 | 2000-09-22 | Koito Mfg Co Ltd | Vehicle headlamp |
US7217314B2 (en) * | 2005-01-10 | 2007-05-15 | Gore Enterprise Holdings, Inc. | Venting system for minimizing condensation in a lighting assembly |
US8465186B2 (en) * | 2009-03-13 | 2013-06-18 | Gore Enterprise Holdings, Inc. | Moisture resistant coatings for polymeric enclosures |
DE102012108773A1 (en) * | 2012-09-18 | 2014-03-20 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Arrangement for air conditioning headlamp of motor vehicle, has textile element that is arranged on inside of headlamp for providing air exchange within headlamp |
DE102013200468B4 (en) * | 2013-01-15 | 2015-05-13 | Automotive Lighting Reutlingen Gmbh | Headlight for motor vehicles |
JP6803130B2 (en) * | 2014-11-19 | 2020-12-23 | 日東電工株式会社 | lamp |
FR3041417B1 (en) * | 2015-09-18 | 2018-08-17 | Psa Automobiles Sa. | VEHICLE PROJECTOR WITH AERATION SYSTEM |
DE102016224099A1 (en) * | 2016-12-05 | 2018-06-07 | Volkswagen Aktiengesellschaft | Lighting device for a motor vehicle |
-
2018
- 2018-06-13 EP EP18382421.8A patent/EP3581848B1/en active Active
-
2019
- 2019-06-06 CN CN201910495862.9A patent/CN110594697B/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3139182A1 (en) * | 2022-08-30 | 2024-03-01 | Psa Automobiles Sa | Motor vehicle headlight with optimized ventilation |
Also Published As
Publication number | Publication date |
---|---|
CN110594697B (en) | 2023-03-21 |
CN110594697A (en) | 2019-12-20 |
EP3581848A1 (en) | 2019-12-18 |
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