EP1058048A2 - Plastic cover lens for motor vehicle headlamps and lamps - Google Patents

Plastic cover lens for motor vehicle headlamps and lamps Download PDF

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Publication number
EP1058048A2
EP1058048A2 EP00111531A EP00111531A EP1058048A2 EP 1058048 A2 EP1058048 A2 EP 1058048A2 EP 00111531 A EP00111531 A EP 00111531A EP 00111531 A EP00111531 A EP 00111531A EP 1058048 A2 EP1058048 A2 EP 1058048A2
Authority
EP
European Patent Office
Prior art keywords
motor vehicle
plastic
coating
sio
pane
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.)
Withdrawn
Application number
EP00111531A
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German (de)
French (fr)
Other versions
EP1058048A3 (en
Inventor
Rudolf Zehe
Ulrich Dr. Temme
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7909858&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1058048(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP1058048A2 publication Critical patent/EP1058048A2/en
Publication of EP1058048A3 publication Critical patent/EP1058048A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • 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
    • F21S45/10—Protection of lighting devices

Definitions

  • the invention relates to a plastic pane of motor vehicle headlights or automotive lights.
  • thermoplastic raw materials The basis of thermoplastic raw materials has been known for a long time.
  • plastic panes of motor vehicle headlights or motor vehicle lights, in particular End glasses plastic panes are increasingly used made of polycarbonate.
  • the vehicles on the inside of the plastic windows that is, on spots on the surface facing the illuminant been. This is essentially dust deposits inside of the incompletely closed system a disturbing impairment cause.
  • the object of the present invention is to stain the especially in the case of profile-free, clear lenses of motor vehicle headlights noticeably bothers to avoid.
  • a Plastic pane of motor vehicle headlights or motor vehicle lights which is characterized in that the disc on the facing the lamp Surface of a transparent coating to avoid staining due to inhomogeneous dust deposits.
  • a motor vehicle headlight or a motor vehicle lamp the spots are particularly different Evaporation of the additives caused by the thermoplastic materials.
  • Operational temperatures in the plastic pane can range from 120 to 125 ° C occur. In places that are particularly hot, there is therefore greater evaporation of additives instead of than in colder zones. If necessary, store here Traces of additives, so that the inner surface is no longer overall has the same static properties. This leads to a different one Dust accumulation.
  • this dust deposition can be prevented in particular if the coating consists of SiO ⁇ SiO 2 (Si 2 O 3 ).
  • This material whose basic application is known for the production of an anti-reflective coating on lenses, is used according to the invention for the first time in the automotive industry.
  • very thin layers in the range from, for example, 5 to 100 nm, in particular 25 to 50 nm, are suitable for largely avoiding the formation of stains.
  • the coating is applied as described in the prior art Methods such as those disclosed in DE 41 28 547 A1, to which full reference is made.
  • a particular embodiment of the present invention therefore consists in coating by PVD, CVD or PECVD, especially by evaporation of SiO.
  • the plastic disc was placed in the vacuum chamber / coating system immediately after the injection molding.
  • the outside of the pane and the pane edge area (pane foot) used in the further assembly process for sealing / gluing was previously covered with a template.
  • SiO was evaporated. This resulted in an Si 2 O 3 layer on the inner surface of the pane.
  • the process times were 15 to 30 minutes.
  • the inside of the pane had an invisible, completely transparent layer.
  • This layer acted as a barrier layer for the additives which normally diffuse out of the plastic, for example the polycarbonate.
  • this layer was electrostatically neutral, so that there was no longer the charge typical of polycarbonate, for example. Both in laboratory tests and in driving tests with real motor vehicle headlights, it was demonstrated that there was no more stain or lichen-like dust accumulation on this layer.
  • the plastic pane was coated on the outside with a hard coat layer before coating with Si 2 O 3 .
  • the advantage of this procedure was that the outer pane of the pane no longer had to be covered in the vacuum process.

Abstract

The plastic disk for motor vehicle headlights and other lights is provided on its inner side with a transparent coating which prevents inhomogeneous accumulation of dust and resultant stain formation on it.

Description

Gegenstand der Erfindung ist eine Kunststoffscheibe von Kraftfahrzeugscheinwerfern oder Kraftfahrzeugleuchten.The invention relates to a plastic pane of motor vehicle headlights or automotive lights.

Die Herstellung von Kraftfahrzeugscheinwerfern und Kraftfahrzeugleuchten auf der Basis von thermoplastischen Rohstoffen ist seit langem bekannt. Bei Kunststoffscheiben von Kraftfahrzeugscheinwerfern oder Kraftfahrzeugleuchten, insbesondere Abschlußscheiben, werden in immer größerem Umfang Kunststoffscheiben aus Polycarbonat angewendet. In jüngster Vergangenheit sind hier beim Gebrauch der Fahrzeuge auf der Innenseite der Kunststoffscheiben, das heißt auf der dem Leuchtmittel zugewandten Oberfläche, Fleckenbildungen beobachtet worden. Hierbei handelt es sich im wesentlichen um Staubablagerungen, die innerhalb des nicht vollständig abgeschlossenen Systems eine störende Beeinträchtigung verursachen.The manufacture of automotive headlights and automotive lights The basis of thermoplastic raw materials has been known for a long time. For plastic panes of motor vehicle headlights or motor vehicle lights, in particular End glasses, plastic panes are increasingly used made of polycarbonate. In the recent past have been in use here of the vehicles on the inside of the plastic windows, that is, on spots on the surface facing the illuminant been. This is essentially dust deposits inside of the incompletely closed system a disturbing impairment cause.

Die Aufgabe der vorliegenden Erfindung besteht darin, die Fleckenbildung, die insbesondere bei profillosen klaren Abschlußscheiben von Kraftfahrzeugscheinwerfern auffällig stört, zu vermeiden. Zwar gibt es bei den Herstellern, die die Rohstoffe zur Fertigung der Kunststoffscheiben herstellen, Bemühungen, Kunststoffe zu entwickeln, die durch entsprechende Materialkomponenten Fleckenbildung vermeiden, jedoch sind diese Materialkombinationen, wie sie beispielsweise in der DE 197 13 508 A1 beschrieben sind, nicht vollkommen zufriedenstellend.The object of the present invention is to stain the especially in the case of profile-free, clear lenses of motor vehicle headlights noticeably bothers to avoid. Although there are manufacturers who have Manufacture raw materials for the manufacture of plastic discs, efforts, plastics to develop the staining caused by appropriate material components avoid, but these are combinations of materials, such as are described in DE 197 13 508 A1, not completely satisfactory.

Die vorgenannte Aufgabe wird in einer ersten Ausführungsform gelöst durch eine Kunststoffscheibe von Kraftfahrzeugscheinwerfern oder Kraftfahrzeugleuchten, die dadurch gekennzeichnet ist, daß die Scheibe auf der dem Leuchtmittel zugewandten Oberfläche eine transparente Beschichtung zur Vermeidung von Fleckenbildung durch inhomogene Staubablagerung aufweist. The above object is achieved in a first embodiment by a Plastic pane of motor vehicle headlights or motor vehicle lights, which is characterized in that the disc on the facing the lamp Surface of a transparent coating to avoid staining due to inhomogeneous dust deposits.

Mit Hilfe der vorliegenden Erfindung wird somit eine nicht sichtbare, völlig transparente Beschichtung für die innere Oberfläche von Kunststoffscheiben von Kraftfahrzeugscheinwerfern und Kraftfahrzeugleuchten zur Verfügung gestellt, die im eingebauten Zustand für eine Reinigung nicht mehr zugänglich sind und aufgrund der elektrostatischen Aufladung dazu neigen, vorhandene Staubpartikel fleckenförmig und dadurch dekorativ auffällig anzulagern.With the help of the present invention, it becomes an invisible, completely transparent Coating for the inner surface of plastic windows of motor vehicle headlights and automotive lights provided in the installed condition are no longer accessible for cleaning and due to the electrostatic charge tend to speck dust particles present and thereby attractively decoratively attach.

Für transparente Thermoplaste sind interne Antistatika, die dem Rohstoff beigegeben werden, ohne Beeinträchtigung der Werkstoffeigenschaften nicht erhältlich. Extern aufgebrachte Antistatika sind nur temporär wirksam und von der im Gerät vorhandenen Luftfeuchte abhängig.For transparent thermoplastics there are internal antistatic agents that are added to the raw material are not available without impairing the material properties. Externally applied antistatic agents are only temporarily effective and of that in the device existing humidity dependent.

In dem durchlüfteten System eine Kraftfahrzeugscheinwerfers oder einer Kraftfahrzeugleuchte werden die Flecken insbesondere durch eine unterschiedliche Verdampfung der Additive der thermoplastischen Materialien verursacht. Im Betrieb können bei der Kunststoffscheibe Temperaturen im Bereich von 120 bis 125 °C auftreten. An Stellen, die besonders heiß sind, findet daher eine größere Verdampfung der Additive statt als an kälteren Zonen. Hier lagern sich gegebenenfalls Spuren der Additive ab, so daß die innere Oberfläche insgesamt nicht mehr die gleichen statischen Eigenschaften aufweist. Hierdurch kommt es zu einer unterschiedlichen Staubanlagerung.In the ventilated system, a motor vehicle headlight or a motor vehicle lamp the spots are particularly different Evaporation of the additives caused by the thermoplastic materials. Operational temperatures in the plastic pane can range from 120 to 125 ° C occur. In places that are particularly hot, there is therefore greater evaporation of additives instead of than in colder zones. If necessary, store here Traces of additives, so that the inner surface is no longer overall has the same static properties. This leads to a different one Dust accumulation.

Mit Hilfe der vorliegenden Erfindung konnte gefunden werden, daß diese Staubablagerung insbesondere dann verhindert werden kann, wenn die Beschichtung aus SiO·SiO2(Si2O3) besteht. Dieses Material, dessen grundsätzliche Anwendung für die Herstellung einer Entspiegelungsschicht auf Linsen bekannt ist, wird erfindungsgemäß erstmals im Bereich der Kraftfahrzeugindustrie eingesetzt. Überraschenderweise konnte gefunden werden, daß sehr dünne Schichten im Bereich von beispielsweise 5 bis 100 nm, insbesondere 25 bis 50 nm geeignet sind, die Fleckenbildung weitestgehend zu vermeiden. With the help of the present invention, it was found that this dust deposition can be prevented in particular if the coating consists of SiO · SiO 2 (Si 2 O 3 ). This material, whose basic application is known for the production of an anti-reflective coating on lenses, is used according to the invention for the first time in the automotive industry. Surprisingly, it was found that very thin layers in the range from, for example, 5 to 100 nm, in particular 25 to 50 nm, are suitable for largely avoiding the formation of stains.

Das Aufbringen der Beschichtung geschieht nach im Stand der Technik beschriebenen Verfahren, wie sie beispielsweise in der DE 41 28 547 A1 offenbart sind, auf die voll inhaltlich Bezug genommen wird.The coating is applied as described in the prior art Methods such as those disclosed in DE 41 28 547 A1, to which full reference is made.

Eine besondere Ausführungsform der vorliegenden Erfindung besteht daher darin, die Beschichtung durch PVD, CVD oder PECVD, insbesondere durch Verdampfung von SiO, herzustellen.A particular embodiment of the present invention therefore consists in coating by PVD, CVD or PECVD, especially by evaporation of SiO.

Ausführungsbeispiele:Examples: Beispiel 1:Example 1:

Die Kunststoffscheibe wurde direkt nach dem Spritzguß in die Vakuumkammer/Beschichtungsanlage gebracht. Die Außenseite der Scheibe und der im weiteren Montageablauf zur Abdichtung/Verklebung dienende Scheibenrandbereich (Scheibenfuß) wurde vorher mittels einer Schablone abgedeckt. Nach Erreichen des Vakuums von 3 - 7 x 10-4 mbar erfolgte das Verdampfen von SiO. Dies führte auf der Scheibeninnenfläche zu einer Belegung mit einer Si2O3-Schicht. Die Prozeßzeiten lagen hier bei 15 bis 30 min. Im Anschluß an diesen Prozeß wies die Scheibeninnenseite eine nicht sichtbare, völlig transparente Schicht auf. Diese Schicht wirkte als Sperrschicht für die aus dem Kunststoff beispielsweise dem Polycarbonat in der Regel diffundierenden Additive. Desweiteren war diese Schicht elektrostatisch neutral, so daß es nicht mehr zu den beispielsweise bei Polycarbonat typischen Aufladungen kam. Sowohl in Labortests als auch im Fahrversuch mit realen Kraftfahrzeugscheinwerfern wurde nachgewiesen, daß es auf dieser Schicht zu keiner flecken- oder flechtenförmigen Staubanlagerung mehr kam.The plastic disc was placed in the vacuum chamber / coating system immediately after the injection molding. The outside of the pane and the pane edge area (pane foot) used in the further assembly process for sealing / gluing was previously covered with a template. After the vacuum of 3 - 7 x 10 -4 mbar was reached, SiO was evaporated. This resulted in an Si 2 O 3 layer on the inner surface of the pane. The process times were 15 to 30 minutes. Following this process, the inside of the pane had an invisible, completely transparent layer. This layer acted as a barrier layer for the additives which normally diffuse out of the plastic, for example the polycarbonate. Furthermore, this layer was electrostatically neutral, so that there was no longer the charge typical of polycarbonate, for example. Both in laboratory tests and in driving tests with real motor vehicle headlights, it was demonstrated that there was no more stain or lichen-like dust accumulation on this layer.

Beispiel 2:Example 2:

Wie Ausführungsbeispiel 1, jedoch wurde die Kunststoffscheibe vor dem Beschichten mit Si2O3 außen mit einer Hardcoat-Schicht lackiert. Vorteil war bei dieser Vorgehensweise, daß die Außenscheibe der Scheibe im Vakuumprozeß nicht mehr zusätzlich abgedeckt werden mußte.Like exemplary embodiment 1, but the plastic pane was coated on the outside with a hard coat layer before coating with Si 2 O 3 . The advantage of this procedure was that the outer pane of the pane no longer had to be covered in the vacuum process.

Claims (7)

Kunststoffscheibe von Kraftfahrzeugscheinwerfern oder Kraftfahrzeugleuchten dadurch gekennzeichnet, daß die Scheibe auf der dem Leuchtmittel zugewandten Oberfläche eine transparente Beschichtung zur Vermeidung von Fleckenbildung durch inhomogene Staubablagerung aufweist.Plastic pane of automotive headlights or automotive lights characterized in that the disc on the illuminant facing surface a transparent coating to avoid Stains due to inhomogeneous dust deposits. Kunststoffscheibe nach Anspruch 1, dadurch gekennzeichnet, daß diese aus einem Polycarbonat hergestellt ist.Plastic disc according to claim 1, characterized in that it is made of a polycarbonate. Kunststoffscheibe nach Anspruch 1, dadurch gekennzeichnet, daß diese auf der dem Leuchtmittel abgewandten Oberfläche eine Hartcoat-Beschichtung aufweist.Plastic disc according to claim 1, characterized in that it a hard coat coating on the surface facing away from the lamp having. Kunststoffscheibe nach Anspruch 1, dadurch gekennzeichnet, daß die Beschichtung aus SiO·SiO2 (Si2O3) besteht.Plastic pane according to claim 1, characterized in that the coating consists of SiO · SiO 2 (Si 2 O 3 ). Kunststoffscheibe nach Anspruch 1, dadurch gekennzeichnet, daß die Schichtdicke der Beschichtung 5 bis 100 nm, insbesondere 25 bis 50 nm beträgt.Plastic disc according to claim 1, characterized in that the Layer thickness of the coating is 5 to 100 nm, in particular 25 to 50 nm. Verfahren zur Herstellung von Kunststoffscheiben von Kraftfahrzeugscheinwerfern oder Kraftfahrzeugleuchten dadurch gekennzeichnet, daß man auf die Scheibe der dem Leuchtmittel zugewandten Oberfläche eine Beschichtung zur Vermeidung von Fleckenbildung durch Aufdampfen einer Schicht aus SiO·SiO2 (Si2O3) aufbringt.Process for the production of plastic panes of motor vehicle headlights or motor vehicle lights, characterized in that a coating is applied to the pane of the surface facing the illuminant to avoid the formation of stains by vapor deposition of a layer of SiO · SiO 2 (Si 2 O 3 ). Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß man die Beschichtung durch PVD, CVD oder PECVD, insbesondere durch Verdampfung von SiO, herstellt.A method according to claim 4, characterized in that the coating by PVD, CVD or PECVD, in particular by evaporation of SiO.
EP00111531A 1999-06-01 2000-05-30 Plastic cover lens for motor vehicle headlamps and lamps Withdrawn EP1058048A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19925049A DE19925049C5 (en) 1999-06-01 1999-06-01 Plastic disc of motor vehicle headlights or motor vehicle lights and method for their production
DE19925049 1999-06-01

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EP1058048A2 true EP1058048A2 (en) 2000-12-06
EP1058048A3 EP1058048A3 (en) 2004-06-30

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EP00111531A Withdrawn EP1058048A3 (en) 1999-06-01 2000-05-30 Plastic cover lens for motor vehicle headlamps and lamps

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US (1) US6394635B1 (en)
EP (1) EP1058048A3 (en)
DE (1) DE19925049C5 (en)

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
JP2002124108A (en) * 2000-10-17 2002-04-26 Koito Mfg Co Ltd Lighting device for vehicle
US6916110B2 (en) * 2003-05-29 2005-07-12 Rene C. Batiste Flame simulating devices for use with lights and method thereof
DE10335876B4 (en) * 2003-08-06 2010-07-22 GM Global Technology Operations, Inc., Detroit Luminaire assembly and method of manufacture
EP2151144A2 (en) * 2007-04-27 2010-02-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Headlight for a motor vehicle

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DE4128547A1 (en) 1991-08-28 1993-03-04 Leybold Ag METHOD AND DEVICE FOR THE PRODUCTION OF A RE-MIRRORING LAYER ON LENSES
DE19713508A1 (en) 1997-04-01 1998-10-08 Bayer Ag Polycarbonate / graft polymer molding compounds with reduced deposit formation

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Publication number Priority date Publication date Assignee Title
DE4128547A1 (en) 1991-08-28 1993-03-04 Leybold Ag METHOD AND DEVICE FOR THE PRODUCTION OF A RE-MIRRORING LAYER ON LENSES
DE19713508A1 (en) 1997-04-01 1998-10-08 Bayer Ag Polycarbonate / graft polymer molding compounds with reduced deposit formation

Also Published As

Publication number Publication date
DE19925049A1 (en) 2000-12-07
DE19925049C5 (en) 2005-12-22
DE19925049C2 (en) 2003-05-22
EP1058048A3 (en) 2004-06-30
US6394635B1 (en) 2002-05-28

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